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ara-mdk / platform / external / v8 / 589d6979ff2ef66fca2d8fa51404c369ca5e9250 / . / src / arm / code-stubs-arm.cc
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// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "v8.h"
#if defined(V8_TARGET_ARCH_ARM)
#include "bootstrapper.h"
#include "code-stubs.h"
#include "regexp-macro-assembler.h"
namespace v8 {
namespace internal {
#define __ ACCESS_MASM(masm)
static void EmitIdenticalObjectComparison(MacroAssembler* masm,
Label* slow,
Condition cond,
bool never_nan_nan);
static void EmitSmiNonsmiComparison(MacroAssembler* masm,
Register lhs,
Register rhs,
Label* lhs_not_nan,
Label* slow,
bool strict);
static void EmitTwoNonNanDoubleComparison(MacroAssembler* masm, Condition cond);
static void EmitStrictTwoHeapObjectCompare(MacroAssembler* masm,
Register lhs,
Register rhs);
// Check if the operand is a heap number.
static void EmitCheckForHeapNumber(MacroAssembler* masm, Register operand,
Register scratch1, Register scratch2,
Label* not_a_heap_number) {
__ ldr(scratch1, FieldMemOperand(operand, HeapObject::kMapOffset));
__ LoadRoot(scratch2, Heap::kHeapNumberMapRootIndex);
__ cmp(scratch1, scratch2);
__ b(ne, not_a_heap_number);
}
void ToNumberStub::Generate(MacroAssembler* masm) {
// The ToNumber stub takes one argument in eax.
Label check_heap_number, call_builtin;
__ JumpIfNotSmi(r0, &check_heap_number);
__ Ret();
__ bind(&check_heap_number);
EmitCheckForHeapNumber(masm, r0, r1, ip, &call_builtin);
__ Ret();
__ bind(&call_builtin);
__ push(r0);
__ InvokeBuiltin(Builtins::TO_NUMBER, JUMP_FUNCTION);
}
void FastNewClosureStub::Generate(MacroAssembler* masm) {
// Create a new closure from the given function info in new
// space. Set the context to the current context in cp.
Label gc;
// Pop the function info from the stack.
__ pop(r3);
// Attempt to allocate new JSFunction in new space.
__ AllocateInNewSpace(JSFunction::kSize,
r0,
r1,
r2,
&gc,
TAG_OBJECT);
int map_index = strict_mode_ == kStrictMode
? Context::STRICT_MODE_FUNCTION_MAP_INDEX
: Context::FUNCTION_MAP_INDEX;
// Compute the function map in the current global context and set that
// as the map of the allocated object.
__ ldr(r2, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
__ ldr(r2, FieldMemOperand(r2, GlobalObject::kGlobalContextOffset));
__ ldr(r2, MemOperand(r2, Context::SlotOffset(map_index)));
__ str(r2, FieldMemOperand(r0, HeapObject::kMapOffset));
// Initialize the rest of the function. We don't have to update the
// write barrier because the allocated object is in new space.
__ LoadRoot(r1, Heap::kEmptyFixedArrayRootIndex);
__ LoadRoot(r2, Heap::kTheHoleValueRootIndex);
__ LoadRoot(r4, Heap::kUndefinedValueRootIndex);
__ str(r1, FieldMemOperand(r0, JSObject::kPropertiesOffset));
__ str(r1, FieldMemOperand(r0, JSObject::kElementsOffset));
__ str(r2, FieldMemOperand(r0, JSFunction::kPrototypeOrInitialMapOffset));
__ str(r3, FieldMemOperand(r0, JSFunction::kSharedFunctionInfoOffset));
__ str(cp, FieldMemOperand(r0, JSFunction::kContextOffset));
__ str(r1, FieldMemOperand(r0, JSFunction::kLiteralsOffset));
__ str(r4, FieldMemOperand(r0, JSFunction::kNextFunctionLinkOffset));
// Initialize the code pointer in the function to be the one
// found in the shared function info object.
__ ldr(r3, FieldMemOperand(r3, SharedFunctionInfo::kCodeOffset));
__ add(r3, r3, Operand(Code::kHeaderSize - kHeapObjectTag));
__ str(r3, FieldMemOperand(r0, JSFunction::kCodeEntryOffset));
// Return result. The argument function info has been popped already.
__ Ret();
// Create a new closure through the slower runtime call.
__ bind(&gc);
__ LoadRoot(r4, Heap::kFalseValueRootIndex);
__ Push(cp, r3, r4);
__ TailCallRuntime(Runtime::kNewClosure, 3, 1);
}
void FastNewContextStub::Generate(MacroAssembler* masm) {
// Try to allocate the context in new space.
Label gc;
int length = slots_ + Context::MIN_CONTEXT_SLOTS;
// Attempt to allocate the context in new space.
__ AllocateInNewSpace(FixedArray::SizeFor(length),
r0,
r1,
r2,
&gc,
TAG_OBJECT);
// Load the function from the stack.
__ ldr(r3, MemOperand(sp, 0));
// Setup the object header.
__ LoadRoot(r2, Heap::kFunctionContextMapRootIndex);
__ str(r2, FieldMemOperand(r0, HeapObject::kMapOffset));
__ mov(r2, Operand(Smi::FromInt(length)));
__ str(r2, FieldMemOperand(r0, FixedArray::kLengthOffset));
// Setup the fixed slots.
__ mov(r1, Operand(Smi::FromInt(0)));
__ str(r3, MemOperand(r0, Context::SlotOffset(Context::CLOSURE_INDEX)));
__ str(cp, MemOperand(r0, Context::SlotOffset(Context::PREVIOUS_INDEX)));
__ str(r1, MemOperand(r0, Context::SlotOffset(Context::EXTENSION_INDEX)));
// Copy the global object from the previous context.
__ ldr(r1, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
__ str(r1, MemOperand(r0, Context::SlotOffset(Context::GLOBAL_INDEX)));
// Initialize the rest of the slots to undefined.
__ LoadRoot(r1, Heap::kUndefinedValueRootIndex);
for (int i = Context::MIN_CONTEXT_SLOTS; i < length; i++) {
__ str(r1, MemOperand(r0, Context::SlotOffset(i)));
}
// Remove the on-stack argument and return.
__ mov(cp, r0);
__ pop();
__ Ret();
// Need to collect. Call into runtime system.
__ bind(&gc);
__ TailCallRuntime(Runtime::kNewFunctionContext, 1, 1);
}
void FastCloneShallowArrayStub::Generate(MacroAssembler* masm) {
// Stack layout on entry:
//
// [sp]: constant elements.
// [sp + kPointerSize]: literal index.
// [sp + (2 * kPointerSize)]: literals array.
// All sizes here are multiples of kPointerSize.
int elements_size = (length_ > 0) ? FixedArray::SizeFor(length_) : 0;
int size = JSArray::kSize + elements_size;
// Load boilerplate object into r3 and check if we need to create a
// boilerplate.
Label slow_case;
__ ldr(r3, MemOperand(sp, 2 * kPointerSize));
__ ldr(r0, MemOperand(sp, 1 * kPointerSize));
__ add(r3, r3, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
__ ldr(r3, MemOperand(r3, r0, LSL, kPointerSizeLog2 - kSmiTagSize));
__ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
__ cmp(r3, ip);
__ b(eq, &slow_case);
if (FLAG_debug_code) {
const char* message;
Heap::RootListIndex expected_map_index;
if (mode_ == CLONE_ELEMENTS) {
message = "Expected (writable) fixed array";
expected_map_index = Heap::kFixedArrayMapRootIndex;
} else {
ASSERT(mode_ == COPY_ON_WRITE_ELEMENTS);
message = "Expected copy-on-write fixed array";
expected_map_index = Heap::kFixedCOWArrayMapRootIndex;
}
__ push(r3);
__ ldr(r3, FieldMemOperand(r3, JSArray::kElementsOffset));
__ ldr(r3, FieldMemOperand(r3, HeapObject::kMapOffset));
__ LoadRoot(ip, expected_map_index);
__ cmp(r3, ip);
__ Assert(eq, message);
__ pop(r3);
}
// Allocate both the JS array and the elements array in one big
// allocation. This avoids multiple limit checks.
__ AllocateInNewSpace(size,
r0,
r1,
r2,
&slow_case,
TAG_OBJECT);
// Copy the JS array part.
for (int i = 0; i < JSArray::kSize; i += kPointerSize) {
if ((i != JSArray::kElementsOffset) || (length_ == 0)) {
__ ldr(r1, FieldMemOperand(r3, i));
__ str(r1, FieldMemOperand(r0, i));
}
}
if (length_ > 0) {
// Get hold of the elements array of the boilerplate and setup the
// elements pointer in the resulting object.
__ ldr(r3, FieldMemOperand(r3, JSArray::kElementsOffset));
__ add(r2, r0, Operand(JSArray::kSize));
__ str(r2, FieldMemOperand(r0, JSArray::kElementsOffset));
// Copy the elements array.
__ CopyFields(r2, r3, r1.bit(), elements_size / kPointerSize);
}
// Return and remove the on-stack parameters.
__ add(sp, sp, Operand(3 * kPointerSize));
__ Ret();
__ bind(&slow_case);
__ TailCallRuntime(Runtime::kCreateArrayLiteralShallow, 3, 1);
}
// Takes a Smi and converts to an IEEE 64 bit floating point value in two
// registers. The format is 1 sign bit, 11 exponent bits (biased 1023) and
// 52 fraction bits (20 in the first word, 32 in the second). Zeros is a
// scratch register. Destroys the source register. No GC occurs during this
// stub so you don't have to set up the frame.
class ConvertToDoubleStub : public CodeStub {
public:
ConvertToDoubleStub(Register result_reg_1,
Register result_reg_2,
Register source_reg,
Register scratch_reg)
: result1_(result_reg_1),
result2_(result_reg_2),
source_(source_reg),
zeros_(scratch_reg) { }
private:
Register result1_;
Register result2_;
Register source_;
Register zeros_;
// Minor key encoding in 16 bits.
class ModeBits: public BitField<OverwriteMode, 0, 2> {};
class OpBits: public BitField<Token::Value, 2, 14> {};
Major MajorKey() { return ConvertToDouble; }
int MinorKey() {
// Encode the parameters in a unique 16 bit value.
return result1_.code() +
(result2_.code() << 4) +
(source_.code() << 8) +
(zeros_.code() << 12);
}
void Generate(MacroAssembler* masm);
};
void ConvertToDoubleStub::Generate(MacroAssembler* masm) {
Register exponent = result1_;
Register mantissa = result2_;
Label not_special;
// Convert from Smi to integer.
__ mov(source_, Operand(source_, ASR, kSmiTagSize));
// Move sign bit from source to destination. This works because the sign bit
// in the exponent word of the double has the same position and polarity as
// the 2's complement sign bit in a Smi.
STATIC_ASSERT(HeapNumber::kSignMask == 0x80000000u);
__ and_(exponent, source_, Operand(HeapNumber::kSignMask), SetCC);
// Subtract from 0 if source was negative.
__ rsb(source_, source_, Operand(0, RelocInfo::NONE), LeaveCC, ne);
// We have -1, 0 or 1, which we treat specially. Register source_ contains
// absolute value: it is either equal to 1 (special case of -1 and 1),
// greater than 1 (not a special case) or less than 1 (special case of 0).
__ cmp(source_, Operand(1));
__ b(gt, &not_special);
// For 1 or -1 we need to or in the 0 exponent (biased to 1023).
static const uint32_t exponent_word_for_1 =
HeapNumber::kExponentBias << HeapNumber::kExponentShift;
__ orr(exponent, exponent, Operand(exponent_word_for_1), LeaveCC, eq);
// 1, 0 and -1 all have 0 for the second word.
__ mov(mantissa, Operand(0, RelocInfo::NONE));
__ Ret();
__ bind(&not_special);
// Count leading zeros. Uses mantissa for a scratch register on pre-ARM5.
// Gets the wrong answer for 0, but we already checked for that case above.
__ CountLeadingZeros(zeros_, source_, mantissa);
// Compute exponent and or it into the exponent register.
// We use mantissa as a scratch register here. Use a fudge factor to
// divide the constant 31 + HeapNumber::kExponentBias, 0x41d, into two parts
// that fit in the ARM's constant field.
int fudge = 0x400;
__ rsb(mantissa, zeros_, Operand(31 + HeapNumber::kExponentBias - fudge));
__ add(mantissa, mantissa, Operand(fudge));
__ orr(exponent,
exponent,
Operand(mantissa, LSL, HeapNumber::kExponentShift));
// Shift up the source chopping the top bit off.
__ add(zeros_, zeros_, Operand(1));
// This wouldn't work for 1.0 or -1.0 as the shift would be 32 which means 0.
__ mov(source_, Operand(source_, LSL, zeros_));
// Compute lower part of fraction (last 12 bits).
__ mov(mantissa, Operand(source_, LSL, HeapNumber::kMantissaBitsInTopWord));
// And the top (top 20 bits).
__ orr(exponent,
exponent,
Operand(source_, LSR, 32 - HeapNumber::kMantissaBitsInTopWord));
__ Ret();
}
void FloatingPointHelper::LoadSmis(MacroAssembler* masm,
FloatingPointHelper::Destination destination,
Register scratch1,
Register scratch2) {
if (CpuFeatures::IsSupported(VFP3)) {
CpuFeatures::Scope scope(VFP3);
__ mov(scratch1, Operand(r0, ASR, kSmiTagSize));
__ vmov(d7.high(), scratch1);
__ vcvt_f64_s32(d7, d7.high());
__ mov(scratch1, Operand(r1, ASR, kSmiTagSize));
__ vmov(d6.high(), scratch1);
__ vcvt_f64_s32(d6, d6.high());
if (destination == kCoreRegisters) {
__ vmov(r2, r3, d7);
__ vmov(r0, r1, d6);
}
} else {
ASSERT(destination == kCoreRegisters);
// Write Smi from r0 to r3 and r2 in double format.
__ mov(scratch1, Operand(r0));
ConvertToDoubleStub stub1(r3, r2, scratch1, scratch2);
__ push(lr);
__ Call(stub1.GetCode());
// Write Smi from r1 to r1 and r0 in double format.
__ mov(scratch1, Operand(r1));
ConvertToDoubleStub stub2(r1, r0, scratch1, scratch2);
__ Call(stub2.GetCode());
__ pop(lr);
}
}
void FloatingPointHelper::LoadOperands(
MacroAssembler* masm,
FloatingPointHelper::Destination destination,
Register heap_number_map,
Register scratch1,
Register scratch2,
Label* slow) {
// Load right operand (r0) to d6 or r2/r3.
LoadNumber(masm, destination,
r0, d7, r2, r3, heap_number_map, scratch1, scratch2, slow);
// Load left operand (r1) to d7 or r0/r1.
LoadNumber(masm, destination,
r1, d6, r0, r1, heap_number_map, scratch1, scratch2, slow);
}
void FloatingPointHelper::LoadNumber(MacroAssembler* masm,
Destination destination,
Register object,
DwVfpRegister dst,
Register dst1,
Register dst2,
Register heap_number_map,
Register scratch1,
Register scratch2,
Label* not_number) {
if (FLAG_debug_code) {
__ AbortIfNotRootValue(heap_number_map,
Heap::kHeapNumberMapRootIndex,
"HeapNumberMap register clobbered.");
}
Label is_smi, done;
__ JumpIfSmi(object, &is_smi);
__ JumpIfNotHeapNumber(object, heap_number_map, scratch1, not_number);
// Handle loading a double from a heap number.
if (CpuFeatures::IsSupported(VFP3) &&
destination == kVFPRegisters) {
CpuFeatures::Scope scope(VFP3);
// Load the double from tagged HeapNumber to double register.
__ sub(scratch1, object, Operand(kHeapObjectTag));
__ vldr(dst, scratch1, HeapNumber::kValueOffset);
} else {
ASSERT(destination == kCoreRegisters);
// Load the double from heap number to dst1 and dst2 in double format.
__ Ldrd(dst1, dst2, FieldMemOperand(object, HeapNumber::kValueOffset));
}
__ jmp(&done);
// Handle loading a double from a smi.
__ bind(&is_smi);
if (CpuFeatures::IsSupported(VFP3)) {
CpuFeatures::Scope scope(VFP3);
// Convert smi to double using VFP instructions.
__ SmiUntag(scratch1, object);
__ vmov(dst.high(), scratch1);
__ vcvt_f64_s32(dst, dst.high());
if (destination == kCoreRegisters) {
// Load the converted smi to dst1 and dst2 in double format.
__ vmov(dst1, dst2, dst);
}
} else {
ASSERT(destination == kCoreRegisters);
// Write smi to dst1 and dst2 double format.
__ mov(scratch1, Operand(object));
ConvertToDoubleStub stub(dst2, dst1, scratch1, scratch2);
__ push(lr);
__ Call(stub.GetCode());
__ pop(lr);
}
__ bind(&done);
}
void FloatingPointHelper::ConvertNumberToInt32(MacroAssembler* masm,
Register object,
Register dst,
Register heap_number_map,
Register scratch1,
Register scratch2,
Register scratch3,
DwVfpRegister double_scratch,
Label* not_number) {
if (FLAG_debug_code) {
__ AbortIfNotRootValue(heap_number_map,
Heap::kHeapNumberMapRootIndex,
"HeapNumberMap register clobbered.");
}
Label is_smi;
Label done;
Label not_in_int32_range;
__ JumpIfSmi(object, &is_smi);
__ ldr(scratch1, FieldMemOperand(object, HeapNumber::kMapOffset));
__ cmp(scratch1, heap_number_map);
__ b(ne, not_number);
__ ConvertToInt32(object,
dst,
scratch1,
scratch2,
double_scratch,
&not_in_int32_range);
__ jmp(&done);
__ bind(&not_in_int32_range);
__ ldr(scratch1, FieldMemOperand(object, HeapNumber::kExponentOffset));
__ ldr(scratch2, FieldMemOperand(object, HeapNumber::kMantissaOffset));
__ EmitOutOfInt32RangeTruncate(dst,
scratch1,
scratch2,
scratch3);
__ jmp(&done);
__ bind(&is_smi);
__ SmiUntag(dst, object);
__ bind(&done);
}
void FloatingPointHelper::ConvertIntToDouble(MacroAssembler* masm,
Register int_scratch,
Destination destination,
DwVfpRegister double_dst,
Register dst1,
Register dst2,
Register scratch2,
SwVfpRegister single_scratch) {
ASSERT(!int_scratch.is(scratch2));
ASSERT(!int_scratch.is(dst1));
ASSERT(!int_scratch.is(dst2));
Label done;
if (CpuFeatures::IsSupported(VFP3)) {
CpuFeatures::Scope scope(VFP3);
__ vmov(single_scratch, int_scratch);
__ vcvt_f64_s32(double_dst, single_scratch);
if (destination == kCoreRegisters) {
__ vmov(dst1, dst2, double_dst);
}
} else {
Label fewer_than_20_useful_bits;
// Expected output:
// | dst2 | dst1 |
// | s | exp | mantissa |
// Check for zero.
__ cmp(int_scratch, Operand::Zero());
__ mov(dst2, int_scratch);
__ mov(dst1, int_scratch);
__ b(eq, &done);
// Preload the sign of the value.
__ and_(dst2, int_scratch, Operand(HeapNumber::kSignMask), SetCC);
// Get the absolute value of the object (as an unsigned integer).
__ rsb(int_scratch, int_scratch, Operand::Zero(), SetCC, mi);
// Get mantisssa[51:20].
// Get the position of the first set bit.
__ CountLeadingZeros(dst1, int_scratch, scratch2);
__ rsb(dst1, dst1, Operand(31));
// Set the exponent.
__ add(scratch2, dst1, Operand(HeapNumber::kExponentBias));
__ Bfi(dst2, scratch2, scratch2,
HeapNumber::kExponentShift, HeapNumber::kExponentBits);
// Clear the first non null bit.
__ mov(scratch2, Operand(1));
__ bic(int_scratch, int_scratch, Operand(scratch2, LSL, dst1));
__ cmp(dst1, Operand(HeapNumber::kMantissaBitsInTopWord));
// Get the number of bits to set in the lower part of the mantissa.
__ sub(scratch2, dst1, Operand(HeapNumber::kMantissaBitsInTopWord), SetCC);
__ b(mi, &fewer_than_20_useful_bits);
// Set the higher 20 bits of the mantissa.
__ orr(dst2, dst2, Operand(int_scratch, LSR, scratch2));
__ rsb(scratch2, scratch2, Operand(32));
__ mov(dst1, Operand(int_scratch, LSL, scratch2));
__ b(&done);
__ bind(&fewer_than_20_useful_bits);
__ rsb(scratch2, dst1, Operand(HeapNumber::kMantissaBitsInTopWord));
__ mov(scratch2, Operand(int_scratch, LSL, scratch2));
__ orr(dst2, dst2, scratch2);
// Set dst1 to 0.
__ mov(dst1, Operand::Zero());
}
__ bind(&done);
}
void FloatingPointHelper::LoadNumberAsInt32Double(MacroAssembler* masm,
Register object,
Destination destination,
DwVfpRegister double_dst,
Register dst1,
Register dst2,
Register heap_number_map,
Register scratch1,
Register scratch2,
SwVfpRegister single_scratch,
Label* not_int32) {
ASSERT(!scratch1.is(object) && !scratch2.is(object));
ASSERT(!scratch1.is(scratch2));
ASSERT(!heap_number_map.is(object) &&
!heap_number_map.is(scratch1) &&
!heap_number_map.is(scratch2));
Label done, obj_is_not_smi;
__ JumpIfNotSmi(object, &obj_is_not_smi);
__ SmiUntag(scratch1, object);
ConvertIntToDouble(masm, scratch1, destination, double_dst, dst1, dst2,
scratch2, single_scratch);
__ b(&done);
__ bind(&obj_is_not_smi);
if (FLAG_debug_code) {
__ AbortIfNotRootValue(heap_number_map,
Heap::kHeapNumberMapRootIndex,
"HeapNumberMap register clobbered.");
}
__ JumpIfNotHeapNumber(object, heap_number_map, scratch1, not_int32);
// Load the number.
if (CpuFeatures::IsSupported(VFP3)) {
CpuFeatures::Scope scope(VFP3);
// Load the double value.
__ sub(scratch1, object, Operand(kHeapObjectTag));
__ vldr(double_dst, scratch1, HeapNumber::kValueOffset);
__ EmitVFPTruncate(kRoundToZero,
single_scratch,
double_dst,
scratch1,
scratch2,
kCheckForInexactConversion);
// Jump to not_int32 if the operation did not succeed.
__ b(ne, not_int32);
if (destination == kCoreRegisters) {
__ vmov(dst1, dst2, double_dst);
}
} else {
ASSERT(!scratch1.is(object) && !scratch2.is(object));
// Load the double value in the destination registers..
__ Ldrd(dst1, dst2, FieldMemOperand(object, HeapNumber::kValueOffset));
// Check for 0 and -0.
__ bic(scratch1, dst1, Operand(HeapNumber::kSignMask));
__ orr(scratch1, scratch1, Operand(dst2));
__ cmp(scratch1, Operand::Zero());
__ b(eq, &done);
// Check that the value can be exactly represented by a 32-bit integer.
// Jump to not_int32 if that's not the case.
DoubleIs32BitInteger(masm, dst1, dst2, scratch1, scratch2, not_int32);
// dst1 and dst2 were trashed. Reload the double value.
__ Ldrd(dst1, dst2, FieldMemOperand(object, HeapNumber::kValueOffset));
}
__ bind(&done);
}
void FloatingPointHelper::LoadNumberAsInt32(MacroAssembler* masm,
Register object,
Register dst,
Register heap_number_map,
Register scratch1,
Register scratch2,
Register scratch3,
DwVfpRegister double_scratch,
Label* not_int32) {
ASSERT(!dst.is(object));
ASSERT(!scratch1.is(object) && !scratch2.is(object) && !scratch3.is(object));
ASSERT(!scratch1.is(scratch2) &&
!scratch1.is(scratch3) &&
!scratch2.is(scratch3));
Label done;
// Untag the object into the destination register.
__ SmiUntag(dst, object);
// Just return if the object is a smi.
__ JumpIfSmi(object, &done);
if (FLAG_debug_code) {
__ AbortIfNotRootValue(heap_number_map,
Heap::kHeapNumberMapRootIndex,
"HeapNumberMap register clobbered.");
}
__ JumpIfNotHeapNumber(object, heap_number_map, scratch1, not_int32);
// Object is a heap number.
// Convert the floating point value to a 32-bit integer.
if (CpuFeatures::IsSupported(VFP3)) {
CpuFeatures::Scope scope(VFP3);
SwVfpRegister single_scratch = double_scratch.low();
// Load the double value.
__ sub(scratch1, object, Operand(kHeapObjectTag));
__ vldr(double_scratch, scratch1, HeapNumber::kValueOffset);
__ EmitVFPTruncate(kRoundToZero,
single_scratch,
double_scratch,
scratch1,
scratch2,
kCheckForInexactConversion);
// Jump to not_int32 if the operation did not succeed.
__ b(ne, not_int32);
// Get the result in the destination register.
__ vmov(dst, single_scratch);
} else {
// Load the double value in the destination registers.
__ ldr(scratch1, FieldMemOperand(object, HeapNumber::kExponentOffset));
__ ldr(scratch2, FieldMemOperand(object, HeapNumber::kMantissaOffset));
// Check for 0 and -0.
__ bic(dst, scratch1, Operand(HeapNumber::kSignMask));
__ orr(dst, scratch2, Operand(dst));
__ cmp(dst, Operand::Zero());
__ b(eq, &done);
DoubleIs32BitInteger(masm, scratch1, scratch2, dst, scratch3, not_int32);
// Registers state after DoubleIs32BitInteger.
// dst: mantissa[51:20].
// scratch2: 1
// Shift back the higher bits of the mantissa.
__ mov(dst, Operand(dst, LSR, scratch3));
// Set the implicit first bit.
__ rsb(scratch3, scratch3, Operand(32));
__ orr(dst, dst, Operand(scratch2, LSL, scratch3));
// Set the sign.
__ ldr(scratch1, FieldMemOperand(object, HeapNumber::kExponentOffset));
__ tst(scratch1, Operand(HeapNumber::kSignMask));
__ rsb(dst, dst, Operand::Zero(), LeaveCC, mi);
}
__ bind(&done);
}
void FloatingPointHelper::DoubleIs32BitInteger(MacroAssembler* masm,
Register src1,
Register src2,
Register dst,
Register scratch,
Label* not_int32) {
// Get exponent alone in scratch.
__ Ubfx(scratch,
src1,
HeapNumber::kExponentShift,
HeapNumber::kExponentBits);
// Substract the bias from the exponent.
__ sub(scratch, scratch, Operand(HeapNumber::kExponentBias), SetCC);
// src1: higher (exponent) part of the double value.
// src2: lower (mantissa) part of the double value.
// scratch: unbiased exponent.
// Fast cases. Check for obvious non 32-bit integer values.
// Negative exponent cannot yield 32-bit integers.
__ b(mi, not_int32);
// Exponent greater than 31 cannot yield 32-bit integers.
// Also, a positive value with an exponent equal to 31 is outside of the
// signed 32-bit integer range.
// Another way to put it is that if (exponent - signbit) > 30 then the
// number cannot be represented as an int32.
Register tmp = dst;
__ sub(tmp, scratch, Operand(src1, LSR, 31));
__ cmp(tmp, Operand(30));
__ b(gt, not_int32);
// - Bits [21:0] in the mantissa are not null.
__ tst(src2, Operand(0x3fffff));
__ b(ne, not_int32);
// Otherwise the exponent needs to be big enough to shift left all the
// non zero bits left. So we need the (30 - exponent) last bits of the
// 31 higher bits of the mantissa to be null.
// Because bits [21:0] are null, we can check instead that the
// (32 - exponent) last bits of the 32 higher bits of the mantisssa are null.
// Get the 32 higher bits of the mantissa in dst.
__ Ubfx(dst,
src2,
HeapNumber::kMantissaBitsInTopWord,
32 - HeapNumber::kMantissaBitsInTopWord);
__ orr(dst,
dst,
Operand(src1, LSL, HeapNumber::kNonMantissaBitsInTopWord));
// Create the mask and test the lower bits (of the higher bits).
__ rsb(scratch, scratch, Operand(32));
__ mov(src2, Operand(1));
__ mov(src1, Operand(src2, LSL, scratch));
__ sub(src1, src1, Operand(1));
__ tst(dst, src1);
__ b(ne, not_int32);
}
void FloatingPointHelper::CallCCodeForDoubleOperation(
MacroAssembler* masm,
Token::Value op,
Register heap_number_result,
Register scratch) {
// Using core registers:
// r0: Left value (least significant part of mantissa).
// r1: Left value (sign, exponent, top of mantissa).
// r2: Right value (least significant part of mantissa).
// r3: Right value (sign, exponent, top of mantissa).
// Assert that heap_number_result is callee-saved.
// We currently always use r5 to pass it.
ASSERT(heap_number_result.is(r5));
// Push the current return address before the C call. Return will be
// through pop(pc) below.
__ push(lr);
__ PrepareCallCFunction(0, 2, scratch);
if (masm->use_eabi_hardfloat()) {
CpuFeatures::Scope scope(VFP3);
__ vmov(d0, r0, r1);
__ vmov(d1, r2, r3);
}
// Call C routine that may not cause GC or other trouble.
__ CallCFunction(ExternalReference::double_fp_operation(op, masm->isolate()),
0, 2);
// Store answer in the overwritable heap number. Double returned in
// registers r0 and r1 or in d0.
if (masm->use_eabi_hardfloat()) {
CpuFeatures::Scope scope(VFP3);
__ vstr(d0,
FieldMemOperand(heap_number_result, HeapNumber::kValueOffset));
} else {
__ Strd(r0, r1, FieldMemOperand(heap_number_result,
HeapNumber::kValueOffset));
}
// Place heap_number_result in r0 and return to the pushed return address.
__ mov(r0, Operand(heap_number_result));
__ pop(pc);
}
// See comment for class.
void WriteInt32ToHeapNumberStub::Generate(MacroAssembler* masm) {
Label max_negative_int;
// the_int_ has the answer which is a signed int32 but not a Smi.
// We test for the special value that has a different exponent. This test
// has the neat side effect of setting the flags according to the sign.
STATIC_ASSERT(HeapNumber::kSignMask == 0x80000000u);
__ cmp(the_int_, Operand(0x80000000u));
__ b(eq, &max_negative_int);
// Set up the correct exponent in scratch_. All non-Smi int32s have the same.
// A non-Smi integer is 1.xxx * 2^30 so the exponent is 30 (biased).
uint32_t non_smi_exponent =
(HeapNumber::kExponentBias + 30) << HeapNumber::kExponentShift;
__ mov(scratch_, Operand(non_smi_exponent));
// Set the sign bit in scratch_ if the value was negative.
__ orr(scratch_, scratch_, Operand(HeapNumber::kSignMask), LeaveCC, cs);
// Subtract from 0 if the value was negative.
__ rsb(the_int_, the_int_, Operand(0, RelocInfo::NONE), LeaveCC, cs);
// We should be masking the implict first digit of the mantissa away here,
// but it just ends up combining harmlessly with the last digit of the
// exponent that happens to be 1. The sign bit is 0 so we shift 10 to get
// the most significant 1 to hit the last bit of the 12 bit sign and exponent.
ASSERT(((1 << HeapNumber::kExponentShift) & non_smi_exponent) != 0);
const int shift_distance = HeapNumber::kNonMantissaBitsInTopWord - 2;
__ orr(scratch_, scratch_, Operand(the_int_, LSR, shift_distance));
__ str(scratch_, FieldMemOperand(the_heap_number_,
HeapNumber::kExponentOffset));
__ mov(scratch_, Operand(the_int_, LSL, 32 - shift_distance));
__ str(scratch_, FieldMemOperand(the_heap_number_,
HeapNumber::kMantissaOffset));
__ Ret();
__ bind(&max_negative_int);
// The max negative int32 is stored as a positive number in the mantissa of
// a double because it uses a sign bit instead of using two's complement.
// The actual mantissa bits stored are all 0 because the implicit most
// significant 1 bit is not stored.
non_smi_exponent += 1 << HeapNumber::kExponentShift;
__ mov(ip, Operand(HeapNumber::kSignMask | non_smi_exponent));
__ str(ip, FieldMemOperand(the_heap_number_, HeapNumber::kExponentOffset));
__ mov(ip, Operand(0, RelocInfo::NONE));
__ str(ip, FieldMemOperand(the_heap_number_, HeapNumber::kMantissaOffset));
__ Ret();
}
// Handle the case where the lhs and rhs are the same object.
// Equality is almost reflexive (everything but NaN), so this is a test
// for "identity and not NaN".
static void EmitIdenticalObjectComparison(MacroAssembler* masm,
Label* slow,
Condition cond,
bool never_nan_nan) {
Label not_identical;
Label heap_number, return_equal;
__ cmp(r0, r1);
__ b(ne, &not_identical);
// The two objects are identical. If we know that one of them isn't NaN then
// we now know they test equal.
if (cond != eq || !never_nan_nan) {
// Test for NaN. Sadly, we can't just compare to FACTORY->nan_value(),
// so we do the second best thing - test it ourselves.
// They are both equal and they are not both Smis so both of them are not
// Smis. If it's not a heap number, then return equal.
if (cond == lt || cond == gt) {
__ CompareObjectType(r0, r4, r4, FIRST_SPEC_OBJECT_TYPE);
__ b(ge, slow);
} else {
__ CompareObjectType(r0, r4, r4, HEAP_NUMBER_TYPE);
__ b(eq, &heap_number);
// Comparing JS objects with <=, >= is complicated.
if (cond != eq) {
__ cmp(r4, Operand(FIRST_SPEC_OBJECT_TYPE));
__ b(ge, slow);
// Normally here we fall through to return_equal, but undefined is
// special: (undefined == undefined) == true, but
// (undefined <= undefined) == false! See ECMAScript 11.8.5.
if (cond == le || cond == ge) {
__ cmp(r4, Operand(ODDBALL_TYPE));
__ b(ne, &return_equal);
__ LoadRoot(r2, Heap::kUndefinedValueRootIndex);
__ cmp(r0, r2);
__ b(ne, &return_equal);
if (cond == le) {
// undefined <= undefined should fail.
__ mov(r0, Operand(GREATER));
} else {
// undefined >= undefined should fail.
__ mov(r0, Operand(LESS));
}
__ Ret();
}
}
}
}
__ bind(&return_equal);
if (cond == lt) {
__ mov(r0, Operand(GREATER)); // Things aren't less than themselves.
} else if (cond == gt) {
__ mov(r0, Operand(LESS)); // Things aren't greater than themselves.
} else {
__ mov(r0, Operand(EQUAL)); // Things are <=, >=, ==, === themselves.
}
__ Ret();
if (cond != eq || !never_nan_nan) {
// For less and greater we don't have to check for NaN since the result of
// x < x is false regardless. For the others here is some code to check
// for NaN.
if (cond != lt && cond != gt) {
__ bind(&heap_number);
// It is a heap number, so return non-equal if it's NaN and equal if it's
// not NaN.
// The representation of NaN values has all exponent bits (52..62) set,
// and not all mantissa bits (0..51) clear.
// Read top bits of double representation (second word of value).
__ ldr(r2, FieldMemOperand(r0, HeapNumber::kExponentOffset));
// Test that exponent bits are all set.
__ Sbfx(r3, r2, HeapNumber::kExponentShift, HeapNumber::kExponentBits);
// NaNs have all-one exponents so they sign extend to -1.
__ cmp(r3, Operand(-1));
__ b(ne, &return_equal);
// Shift out flag and all exponent bits, retaining only mantissa.
__ mov(r2, Operand(r2, LSL, HeapNumber::kNonMantissaBitsInTopWord));
// Or with all low-bits of mantissa.
__ ldr(r3, FieldMemOperand(r0, HeapNumber::kMantissaOffset));
__ orr(r0, r3, Operand(r2), SetCC);
// For equal we already have the right value in r0: Return zero (equal)
// if all bits in mantissa are zero (it's an Infinity) and non-zero if
// not (it's a NaN). For <= and >= we need to load r0 with the failing
// value if it's a NaN.
if (cond != eq) {
// All-zero means Infinity means equal.
__ Ret(eq);
if (cond == le) {
__ mov(r0, Operand(GREATER)); // NaN <= NaN should fail.
} else {
__ mov(r0, Operand(LESS)); // NaN >= NaN should fail.
}
}
__ Ret();
}
// No fall through here.
}
__ bind(&not_identical);
}
// See comment at call site.
static void EmitSmiNonsmiComparison(MacroAssembler* masm,
Register lhs,
Register rhs,
Label* lhs_not_nan,
Label* slow,
bool strict) {
ASSERT((lhs.is(r0) && rhs.is(r1)) ||
(lhs.is(r1) && rhs.is(r0)));
Label rhs_is_smi;
__ JumpIfSmi(rhs, &rhs_is_smi);
// Lhs is a Smi. Check whether the rhs is a heap number.
__ CompareObjectType(rhs, r4, r4, HEAP_NUMBER_TYPE);
if (strict) {
// If rhs is not a number and lhs is a Smi then strict equality cannot
// succeed. Return non-equal
// If rhs is r0 then there is already a non zero value in it.
if (!rhs.is(r0)) {
__ mov(r0, Operand(NOT_EQUAL), LeaveCC, ne);
}
__ Ret(ne);
} else {
// Smi compared non-strictly with a non-Smi non-heap-number. Call
// the runtime.
__ b(ne, slow);
}
// Lhs is a smi, rhs is a number.
if (CpuFeatures::IsSupported(VFP3)) {
// Convert lhs to a double in d7.
CpuFeatures::Scope scope(VFP3);
__ SmiToDoubleVFPRegister(lhs, d7, r7, s15);
// Load the double from rhs, tagged HeapNumber r0, to d6.
__ sub(r7, rhs, Operand(kHeapObjectTag));
__ vldr(d6, r7, HeapNumber::kValueOffset);
} else {
__ push(lr);
// Convert lhs to a double in r2, r3.
__ mov(r7, Operand(lhs));
ConvertToDoubleStub stub1(r3, r2, r7, r6);
__ Call(stub1.GetCode());
// Load rhs to a double in r0, r1.
__ Ldrd(r0, r1, FieldMemOperand(rhs, HeapNumber::kValueOffset));
__ pop(lr);
}
// We now have both loaded as doubles but we can skip the lhs nan check
// since it's a smi.
__ jmp(lhs_not_nan);
__ bind(&rhs_is_smi);
// Rhs is a smi. Check whether the non-smi lhs is a heap number.
__ CompareObjectType(lhs, r4, r4, HEAP_NUMBER_TYPE);
if (strict) {
// If lhs is not a number and rhs is a smi then strict equality cannot
// succeed. Return non-equal.
// If lhs is r0 then there is already a non zero value in it.
if (!lhs.is(r0)) {
__ mov(r0, Operand(NOT_EQUAL), LeaveCC, ne);
}
__ Ret(ne);
} else {
// Smi compared non-strictly with a non-smi non-heap-number. Call
// the runtime.
__ b(ne, slow);
}
// Rhs is a smi, lhs is a heap number.
if (CpuFeatures::IsSupported(VFP3)) {
CpuFeatures::Scope scope(VFP3);
// Load the double from lhs, tagged HeapNumber r1, to d7.
__ sub(r7, lhs, Operand(kHeapObjectTag));
__ vldr(d7, r7, HeapNumber::kValueOffset);
// Convert rhs to a double in d6 .
__ SmiToDoubleVFPRegister(rhs, d6, r7, s13);
} else {
__ push(lr);
// Load lhs to a double in r2, r3.
__ Ldrd(r2, r3, FieldMemOperand(lhs, HeapNumber::kValueOffset));
// Convert rhs to a double in r0, r1.
__ mov(r7, Operand(rhs));
ConvertToDoubleStub stub2(r1, r0, r7, r6);
__ Call(stub2.GetCode());
__ pop(lr);
}
// Fall through to both_loaded_as_doubles.
}
void EmitNanCheck(MacroAssembler* masm, Label* lhs_not_nan, Condition cond) {
bool exp_first = (HeapNumber::kExponentOffset == HeapNumber::kValueOffset);
Register rhs_exponent = exp_first ? r0 : r1;
Register lhs_exponent = exp_first ? r2 : r3;
Register rhs_mantissa = exp_first ? r1 : r0;
Register lhs_mantissa = exp_first ? r3 : r2;
Label one_is_nan, neither_is_nan;
__ Sbfx(r4,
lhs_exponent,
HeapNumber::kExponentShift,
HeapNumber::kExponentBits);
// NaNs have all-one exponents so they sign extend to -1.
__ cmp(r4, Operand(-1));
__ b(ne, lhs_not_nan);
__ mov(r4,
Operand(lhs_exponent, LSL, HeapNumber::kNonMantissaBitsInTopWord),
SetCC);
__ b(ne, &one_is_nan);
__ cmp(lhs_mantissa, Operand(0, RelocInfo::NONE));
__ b(ne, &one_is_nan);
__ bind(lhs_not_nan);
__ Sbfx(r4,
rhs_exponent,
HeapNumber::kExponentShift,
HeapNumber::kExponentBits);
// NaNs have all-one exponents so they sign extend to -1.
__ cmp(r4, Operand(-1));
__ b(ne, &neither_is_nan);
__ mov(r4,
Operand(rhs_exponent, LSL, HeapNumber::kNonMantissaBitsInTopWord),
SetCC);
__ b(ne, &one_is_nan);
__ cmp(rhs_mantissa, Operand(0, RelocInfo::NONE));
__ b(eq, &neither_is_nan);
__ bind(&one_is_nan);
// NaN comparisons always fail.
// Load whatever we need in r0 to make the comparison fail.
if (cond == lt || cond == le) {
__ mov(r0, Operand(GREATER));
} else {
__ mov(r0, Operand(LESS));
}
__ Ret();
__ bind(&neither_is_nan);
}
// See comment at call site.
static void EmitTwoNonNanDoubleComparison(MacroAssembler* masm,
Condition cond) {
bool exp_first = (HeapNumber::kExponentOffset == HeapNumber::kValueOffset);
Register rhs_exponent = exp_first ? r0 : r1;
Register lhs_exponent = exp_first ? r2 : r3;
Register rhs_mantissa = exp_first ? r1 : r0;
Register lhs_mantissa = exp_first ? r3 : r2;
// r0, r1, r2, r3 have the two doubles. Neither is a NaN.
if (cond == eq) {
// Doubles are not equal unless they have the same bit pattern.
// Exception: 0 and -0.
__ cmp(rhs_mantissa, Operand(lhs_mantissa));
__ orr(r0, rhs_mantissa, Operand(lhs_mantissa), LeaveCC, ne);
// Return non-zero if the numbers are unequal.
__ Ret(ne);
__ sub(r0, rhs_exponent, Operand(lhs_exponent), SetCC);
// If exponents are equal then return 0.
__ Ret(eq);
// Exponents are unequal. The only way we can return that the numbers
// are equal is if one is -0 and the other is 0. We already dealt
// with the case where both are -0 or both are 0.
// We start by seeing if the mantissas (that are equal) or the bottom
// 31 bits of the rhs exponent are non-zero. If so we return not
// equal.
__ orr(r4, lhs_mantissa, Operand(lhs_exponent, LSL, kSmiTagSize), SetCC);
__ mov(r0, Operand(r4), LeaveCC, ne);
__ Ret(ne);
// Now they are equal if and only if the lhs exponent is zero in its
// low 31 bits.
__ mov(r0, Operand(rhs_exponent, LSL, kSmiTagSize));
__ Ret();
} else {
// Call a native function to do a comparison between two non-NaNs.
// Call C routine that may not cause GC or other trouble.
__ push(lr);
__ PrepareCallCFunction(0, 2, r5);
if (masm->use_eabi_hardfloat()) {
CpuFeatures::Scope scope(VFP3);
__ vmov(d0, r0, r1);
__ vmov(d1, r2, r3);
}
__ CallCFunction(ExternalReference::compare_doubles(masm->isolate()),
0, 2);
__ pop(pc); // Return.
}
}
// See comment at call site.
static void EmitStrictTwoHeapObjectCompare(MacroAssembler* masm,
Register lhs,
Register rhs) {
ASSERT((lhs.is(r0) && rhs.is(r1)) ||
(lhs.is(r1) && rhs.is(r0)));
// If either operand is a JS object or an oddball value, then they are
// not equal since their pointers are different.
// There is no test for undetectability in strict equality.
STATIC_ASSERT(LAST_TYPE == LAST_CALLABLE_SPEC_OBJECT_TYPE);
Label first_non_object;
// Get the type of the first operand into r2 and compare it with
// FIRST_SPEC_OBJECT_TYPE.
__ CompareObjectType(rhs, r2, r2, FIRST_SPEC_OBJECT_TYPE);
__ b(lt, &first_non_object);
// Return non-zero (r0 is not zero)
Label return_not_equal;
__ bind(&return_not_equal);
__ Ret();
__ bind(&first_non_object);
// Check for oddballs: true, false, null, undefined.
__ cmp(r2, Operand(ODDBALL_TYPE));
__ b(eq, &return_not_equal);
__ CompareObjectType(lhs, r3, r3, FIRST_SPEC_OBJECT_TYPE);
__ b(ge, &return_not_equal);
// Check for oddballs: true, false, null, undefined.
__ cmp(r3, Operand(ODDBALL_TYPE));
__ b(eq, &return_not_equal);
// Now that we have the types we might as well check for symbol-symbol.
// Ensure that no non-strings have the symbol bit set.
STATIC_ASSERT(LAST_TYPE < kNotStringTag + kIsSymbolMask);
STATIC_ASSERT(kSymbolTag != 0);
__ and_(r2, r2, Operand(r3));
__ tst(r2, Operand(kIsSymbolMask));
__ b(ne, &return_not_equal);
}
// See comment at call site.
static void EmitCheckForTwoHeapNumbers(MacroAssembler* masm,
Register lhs,
Register rhs,
Label* both_loaded_as_doubles,
Label* not_heap_numbers,
Label* slow) {
ASSERT((lhs.is(r0) && rhs.is(r1)) ||
(lhs.is(r1) && rhs.is(r0)));
__ CompareObjectType(rhs, r3, r2, HEAP_NUMBER_TYPE);
__ b(ne, not_heap_numbers);
__ ldr(r2, FieldMemOperand(lhs, HeapObject::kMapOffset));
__ cmp(r2, r3);
__ b(ne, slow); // First was a heap number, second wasn't. Go slow case.
// Both are heap numbers. Load them up then jump to the code we have
// for that.
if (CpuFeatures::IsSupported(VFP3)) {
CpuFeatures::Scope scope(VFP3);
__ sub(r7, rhs, Operand(kHeapObjectTag));
__ vldr(d6, r7, HeapNumber::kValueOffset);
__ sub(r7, lhs, Operand(kHeapObjectTag));
__ vldr(d7, r7, HeapNumber::kValueOffset);
} else {
__ Ldrd(r2, r3, FieldMemOperand(lhs, HeapNumber::kValueOffset));
__ Ldrd(r0, r1, FieldMemOperand(rhs, HeapNumber::kValueOffset));
}
__ jmp(both_loaded_as_doubles);
}
// Fast negative check for symbol-to-symbol equality.
static void EmitCheckForSymbolsOrObjects(MacroAssembler* masm,
Register lhs,
Register rhs,
Label* possible_strings,
Label* not_both_strings) {
ASSERT((lhs.is(r0) && rhs.is(r1)) ||
(lhs.is(r1) && rhs.is(r0)));
// r2 is object type of rhs.
// Ensure that no non-strings have the symbol bit set.
Label object_test;
STATIC_ASSERT(kSymbolTag != 0);
__ tst(r2, Operand(kIsNotStringMask));
__ b(ne, &object_test);
__ tst(r2, Operand(kIsSymbolMask));
__ b(eq, possible_strings);
__ CompareObjectType(lhs, r3, r3, FIRST_NONSTRING_TYPE);
__ b(ge, not_both_strings);
__ tst(r3, Operand(kIsSymbolMask));
__ b(eq, possible_strings);
// Both are symbols. We already checked they weren't the same pointer
// so they are not equal.
__ mov(r0, Operand(NOT_EQUAL));
__ Ret();
__ bind(&object_test);
__ cmp(r2, Operand(FIRST_SPEC_OBJECT_TYPE));
__ b(lt, not_both_strings);
__ CompareObjectType(lhs, r2, r3, FIRST_SPEC_OBJECT_TYPE);
__ b(lt, not_both_strings);
// If both objects are undetectable, they are equal. Otherwise, they
// are not equal, since they are different objects and an object is not
// equal to undefined.
__ ldr(r3, FieldMemOperand(rhs, HeapObject::kMapOffset));
__ ldrb(r2, FieldMemOperand(r2, Map::kBitFieldOffset));
__ ldrb(r3, FieldMemOperand(r3, Map::kBitFieldOffset));
__ and_(r0, r2, Operand(r3));
__ and_(r0, r0, Operand(1 << Map::kIsUndetectable));
__ eor(r0, r0, Operand(1 << Map::kIsUndetectable));
__ Ret();
}
void NumberToStringStub::GenerateLookupNumberStringCache(MacroAssembler* masm,
Register object,
Register result,
Register scratch1,
Register scratch2,
Register scratch3,
bool object_is_smi,
Label* not_found) {
// Use of registers. Register result is used as a temporary.
Register number_string_cache = result;
Register mask = scratch3;
// Load the number string cache.
__ LoadRoot(number_string_cache, Heap::kNumberStringCacheRootIndex);
// Make the hash mask from the length of the number string cache. It
// contains two elements (number and string) for each cache entry.
__ ldr(mask, FieldMemOperand(number_string_cache, FixedArray::kLengthOffset));
// Divide length by two (length is a smi).
__ mov(mask, Operand(mask, ASR, kSmiTagSize + 1));
__ sub(mask, mask, Operand(1)); // Make mask.
// Calculate the entry in the number string cache. The hash value in the
// number string cache for smis is just the smi value, and the hash for
// doubles is the xor of the upper and lower words. See
// Heap::GetNumberStringCache.
Isolate* isolate = masm->isolate();
Label is_smi;
Label load_result_from_cache;
if (!object_is_smi) {
__ JumpIfSmi(object, &is_smi);
if (CpuFeatures::IsSupported(VFP3)) {
CpuFeatures::Scope scope(VFP3);
__ CheckMap(object,
scratch1,
Heap::kHeapNumberMapRootIndex,
not_found,
DONT_DO_SMI_CHECK);
STATIC_ASSERT(8 == kDoubleSize);
__ add(scratch1,
object,
Operand(HeapNumber::kValueOffset - kHeapObjectTag));
__ ldm(ia, scratch1, scratch1.bit() | scratch2.bit());
__ eor(scratch1, scratch1, Operand(scratch2));
__ and_(scratch1, scratch1, Operand(mask));
// Calculate address of entry in string cache: each entry consists
// of two pointer sized fields.
__ add(scratch1,
number_string_cache,
Operand(scratch1, LSL, kPointerSizeLog2 + 1));
Register probe = mask;
__ ldr(probe,
FieldMemOperand(scratch1, FixedArray::kHeaderSize));
__ JumpIfSmi(probe, not_found);
__ sub(scratch2, object, Operand(kHeapObjectTag));
__ vldr(d0, scratch2, HeapNumber::kValueOffset);
__ sub(probe, probe, Operand(kHeapObjectTag));
__ vldr(d1, probe, HeapNumber::kValueOffset);
__ VFPCompareAndSetFlags(d0, d1);
__ b(ne, not_found); // The cache did not contain this value.
__ b(&load_result_from_cache);
} else {
__ b(not_found);
}
}
__ bind(&is_smi);
Register scratch = scratch1;
__ and_(scratch, mask, Operand(object, ASR, 1));
// Calculate address of entry in string cache: each entry consists
// of two pointer sized fields.
__ add(scratch,
number_string_cache,
Operand(scratch, LSL, kPointerSizeLog2 + 1));
// Check if the entry is the smi we are looking for.
Register probe = mask;
__ ldr(probe, FieldMemOperand(scratch, FixedArray::kHeaderSize));
__ cmp(object, probe);
__ b(ne, not_found);
// Get the result from the cache.
__ bind(&load_result_from_cache);
__ ldr(result,
FieldMemOperand(scratch, FixedArray::kHeaderSize + kPointerSize));
__ IncrementCounter(isolate->counters()->number_to_string_native(),
1,
scratch1,
scratch2);
}
void NumberToStringStub::Generate(MacroAssembler* masm) {
Label runtime;
__ ldr(r1, MemOperand(sp, 0));
// Generate code to lookup number in the number string cache.
GenerateLookupNumberStringCache(masm, r1, r0, r2, r3, r4, false, &runtime);
__ add(sp, sp, Operand(1 * kPointerSize));
__ Ret();
__ bind(&runtime);
// Handle number to string in the runtime system if not found in the cache.
__ TailCallRuntime(Runtime::kNumberToStringSkipCache, 1, 1);
}
// On entry lhs_ and rhs_ are the values to be compared.
// On exit r0 is 0, positive or negative to indicate the result of
// the comparison.
void CompareStub::Generate(MacroAssembler* masm) {
ASSERT((lhs_.is(r0) && rhs_.is(r1)) ||
(lhs_.is(r1) && rhs_.is(r0)));
Label slow; // Call builtin.
Label not_smis, both_loaded_as_doubles, lhs_not_nan;
if (include_smi_compare_) {
Label not_two_smis, smi_done;
__ orr(r2, r1, r0);
__ JumpIfNotSmi(r2, &not_two_smis);
__ mov(r1, Operand(r1, ASR, 1));
__ sub(r0, r1, Operand(r0, ASR, 1));
__ Ret();
__ bind(&not_two_smis);
} else if (FLAG_debug_code) {
__ orr(r2, r1, r0);
__ tst(r2, Operand(kSmiTagMask));
__ Assert(ne, "CompareStub: unexpected smi operands.");
}
// NOTICE! This code is only reached after a smi-fast-case check, so
// it is certain that at least one operand isn't a smi.
// Handle the case where the objects are identical. Either returns the answer
// or goes to slow. Only falls through if the objects were not identical.
EmitIdenticalObjectComparison(masm, &slow, cc_, never_nan_nan_);
// If either is a Smi (we know that not both are), then they can only
// be strictly equal if the other is a HeapNumber.
STATIC_ASSERT(kSmiTag == 0);
ASSERT_EQ(0, Smi::FromInt(0));
__ and_(r2, lhs_, Operand(rhs_));
__ JumpIfNotSmi(r2, &not_smis);
// One operand is a smi. EmitSmiNonsmiComparison generates code that can:
// 1) Return the answer.
// 2) Go to slow.
// 3) Fall through to both_loaded_as_doubles.
// 4) Jump to lhs_not_nan.
// In cases 3 and 4 we have found out we were dealing with a number-number
// comparison. If VFP3 is supported the double values of the numbers have
// been loaded into d7 and d6. Otherwise, the double values have been loaded
// into r0, r1, r2, and r3.
EmitSmiNonsmiComparison(masm, lhs_, rhs_, &lhs_not_nan, &slow, strict_);
__ bind(&both_loaded_as_doubles);
// The arguments have been converted to doubles and stored in d6 and d7, if
// VFP3 is supported, or in r0, r1, r2, and r3.
Isolate* isolate = masm->isolate();
if (CpuFeatures::IsSupported(VFP3)) {
__ bind(&lhs_not_nan);
CpuFeatures::Scope scope(VFP3);
Label no_nan;
// ARMv7 VFP3 instructions to implement double precision comparison.
__ VFPCompareAndSetFlags(d7, d6);
Label nan;
__ b(vs, &nan);
__ mov(r0, Operand(EQUAL), LeaveCC, eq);
__ mov(r0, Operand(LESS), LeaveCC, lt);
__ mov(r0, Operand(GREATER), LeaveCC, gt);
__ Ret();
__ bind(&nan);
// If one of the sides was a NaN then the v flag is set. Load r0 with
// whatever it takes to make the comparison fail, since comparisons with NaN
// always fail.
if (cc_ == lt || cc_ == le) {
__ mov(r0, Operand(GREATER));
} else {
__ mov(r0, Operand(LESS));
}
__ Ret();
} else {
// Checks for NaN in the doubles we have loaded. Can return the answer or
// fall through if neither is a NaN. Also binds lhs_not_nan.
EmitNanCheck(masm, &lhs_not_nan, cc_);
// Compares two doubles in r0, r1, r2, r3 that are not NaNs. Returns the
// answer. Never falls through.
EmitTwoNonNanDoubleComparison(masm, cc_);
}
__ bind(&not_smis);
// At this point we know we are dealing with two different objects,
// and neither of them is a Smi. The objects are in rhs_ and lhs_.
if (strict_) {
// This returns non-equal for some object types, or falls through if it
// was not lucky.
EmitStrictTwoHeapObjectCompare(masm, lhs_, rhs_);
}
Label check_for_symbols;
Label flat_string_check;
// Check for heap-number-heap-number comparison. Can jump to slow case,
// or load both doubles into r0, r1, r2, r3 and jump to the code that handles
// that case. If the inputs are not doubles then jumps to check_for_symbols.
// In this case r2 will contain the type of rhs_. Never falls through.
EmitCheckForTwoHeapNumbers(masm,
lhs_,
rhs_,
&both_loaded_as_doubles,
&check_for_symbols,
&flat_string_check);
__ bind(&check_for_symbols);
// In the strict case the EmitStrictTwoHeapObjectCompare already took care of
// symbols.
if (cc_ == eq && !strict_) {
// Returns an answer for two symbols or two detectable objects.
// Otherwise jumps to string case or not both strings case.
// Assumes that r2 is the type of rhs_ on entry.
EmitCheckForSymbolsOrObjects(masm, lhs_, rhs_, &flat_string_check, &slow);
}
// Check for both being sequential ASCII strings, and inline if that is the
// case.
__ bind(&flat_string_check);
__ JumpIfNonSmisNotBothSequentialAsciiStrings(lhs_, rhs_, r2, r3, &slow);
__ IncrementCounter(isolate->counters()->string_compare_native(), 1, r2, r3);
if (cc_ == eq) {
StringCompareStub::GenerateFlatAsciiStringEquals(masm,
lhs_,
rhs_,
r2,
r3,
r4);
} else {
StringCompareStub::GenerateCompareFlatAsciiStrings(masm,
lhs_,
rhs_,
r2,
r3,
r4,
r5);
}
// Never falls through to here.
__ bind(&slow);
__ Push(lhs_, rhs_);
// Figure out which native to call and setup the arguments.
Builtins::JavaScript native;
if (cc_ == eq) {
native = strict_ ? Builtins::STRICT_EQUALS : Builtins::EQUALS;
} else {
native = Builtins::COMPARE;
int ncr; // NaN compare result
if (cc_ == lt || cc_ == le) {
ncr = GREATER;
} else {
ASSERT(cc_ == gt || cc_ == ge); // remaining cases
ncr = LESS;
}
__ mov(r0, Operand(Smi::FromInt(ncr)));
__ push(r0);
}
// Call the native; it returns -1 (less), 0 (equal), or 1 (greater)
// tagged as a small integer.
__ InvokeBuiltin(native, JUMP_FUNCTION);
}
// The stub expects its argument in the tos_ register and returns its result in
// it, too: zero for false, and a non-zero value for true.
void ToBooleanStub::Generate(MacroAssembler* masm) {
// This stub uses VFP3 instructions.
CpuFeatures::Scope scope(VFP3);
Label patch;
const Register map = r9.is(tos_) ? r7 : r9;
// undefined -> false.
CheckOddball(masm, UNDEFINED, Heap::kUndefinedValueRootIndex, false);
// Boolean -> its value.
CheckOddball(masm, BOOLEAN, Heap::kFalseValueRootIndex, false);
CheckOddball(masm, BOOLEAN, Heap::kTrueValueRootIndex, true);
// 'null' -> false.
CheckOddball(masm, NULL_TYPE, Heap::kNullValueRootIndex, false);
if (types_.Contains(SMI)) {
// Smis: 0 -> false, all other -> true
__ tst(tos_, Operand(kSmiTagMask));
// tos_ contains the correct return value already
__ Ret(eq);
} else if (types_.NeedsMap()) {
// If we need a map later and have a Smi -> patch.
__ JumpIfSmi(tos_, &patch);
}
if (types_.NeedsMap()) {
__ ldr(map, FieldMemOperand(tos_, HeapObject::kMapOffset));
if (types_.CanBeUndetectable()) {
__ ldrb(ip, FieldMemOperand(map, Map::kBitFieldOffset));
__ tst(ip, Operand(1 << Map::kIsUndetectable));
// Undetectable -> false.
__ mov(tos_, Operand(0, RelocInfo::NONE), LeaveCC, ne);
__ Ret(ne);
}
}
if (types_.Contains(SPEC_OBJECT)) {
// Spec object -> true.
__ CompareInstanceType(map, ip, FIRST_SPEC_OBJECT_TYPE);
// tos_ contains the correct non-zero return value already.
__ Ret(ge);
}
if (types_.Contains(STRING)) {
// String value -> false iff empty.
__ CompareInstanceType(map, ip, FIRST_NONSTRING_TYPE);
__ ldr(tos_, FieldMemOperand(tos_, String::kLengthOffset), lt);
__ Ret(lt); // the string length is OK as the return value
}
if (types_.Contains(HEAP_NUMBER)) {
// Heap number -> false iff +0, -0, or NaN.
Label not_heap_number;
__ CompareRoot(map, Heap::kHeapNumberMapRootIndex);
__ b(ne, &not_heap_number);
__ vldr(d1, FieldMemOperand(tos_, HeapNumber::kValueOffset));
__ VFPCompareAndSetFlags(d1, 0.0);
// "tos_" is a register, and contains a non zero value by default.
// Hence we only need to overwrite "tos_" with zero to return false for
// FP_ZERO or FP_NAN cases. Otherwise, by default it returns true.
__ mov(tos_, Operand(0, RelocInfo::NONE), LeaveCC, eq); // for FP_ZERO
__ mov(tos_, Operand(0, RelocInfo::NONE), LeaveCC, vs); // for FP_NAN
__ Ret();
__ bind(&not_heap_number);
}
__ bind(&patch);
GenerateTypeTransition(masm);
}
void ToBooleanStub::CheckOddball(MacroAssembler* masm,
Type type,
Heap::RootListIndex value,
bool result) {
if (types_.Contains(type)) {
// If we see an expected oddball, return its ToBoolean value tos_.
__ LoadRoot(ip, value);
__ cmp(tos_, ip);
// The value of a root is never NULL, so we can avoid loading a non-null
// value into tos_ when we want to return 'true'.
if (!result) {
__ mov(tos_, Operand(0, RelocInfo::NONE), LeaveCC, eq);
}
__ Ret(eq);
}
}
void ToBooleanStub::GenerateTypeTransition(MacroAssembler* masm) {
if (!tos_.is(r3)) {
__ mov(r3, Operand(tos_));
}
__ mov(r2, Operand(Smi::FromInt(tos_.code())));
__ mov(r1, Operand(Smi::FromInt(types_.ToByte())));
__ Push(r3, r2, r1);
// Patch the caller to an appropriate specialized stub and return the
// operation result to the caller of the stub.
__ TailCallExternalReference(
ExternalReference(IC_Utility(IC::kToBoolean_Patch), masm->isolate()),
3,
1);
}
void UnaryOpStub::PrintName(StringStream* stream) {
const char* op_name = Token::Name(op_);
const char* overwrite_name = NULL; // Make g++ happy.
switch (mode_) {
case UNARY_NO_OVERWRITE: overwrite_name = "Alloc"; break;
case UNARY_OVERWRITE: overwrite_name = "Overwrite"; break;
}
stream->Add("UnaryOpStub_%s_%s_%s",
op_name,
overwrite_name,
UnaryOpIC::GetName(operand_type_));
}
// TODO(svenpanne): Use virtual functions instead of switch.
void UnaryOpStub::Generate(MacroAssembler* masm) {
switch (operand_type_) {
case UnaryOpIC::UNINITIALIZED:
GenerateTypeTransition(masm);
break;
case UnaryOpIC::SMI:
GenerateSmiStub(masm);
break;
case UnaryOpIC::HEAP_NUMBER:
GenerateHeapNumberStub(masm);
break;
case UnaryOpIC::GENERIC:
GenerateGenericStub(masm);
break;
}
}
void UnaryOpStub::GenerateTypeTransition(MacroAssembler* masm) {
__ mov(r3, Operand(r0)); // the operand
__ mov(r2, Operand(Smi::FromInt(op_)));
__ mov(r1, Operand(Smi::FromInt(mode_)));
__ mov(r0, Operand(Smi::FromInt(operand_type_)));
__ Push(r3, r2, r1, r0);
__ TailCallExternalReference(
ExternalReference(IC_Utility(IC::kUnaryOp_Patch), masm->isolate()), 4, 1);
}
// TODO(svenpanne): Use virtual functions instead of switch.
void UnaryOpStub::GenerateSmiStub(MacroAssembler* masm) {
switch (op_) {
case Token::SUB:
GenerateSmiStubSub(masm);
break;
case Token::BIT_NOT:
GenerateSmiStubBitNot(masm);
break;
default:
UNREACHABLE();
}
}
void UnaryOpStub::GenerateSmiStubSub(MacroAssembler* masm) {
Label non_smi, slow;
GenerateSmiCodeSub(masm, &non_smi, &slow);
__ bind(&non_smi);
__ bind(&slow);
GenerateTypeTransition(masm);
}
void UnaryOpStub::GenerateSmiStubBitNot(MacroAssembler* masm) {
Label non_smi;
GenerateSmiCodeBitNot(masm, &non_smi);
__ bind(&non_smi);
GenerateTypeTransition(masm);
}
void UnaryOpStub::GenerateSmiCodeSub(MacroAssembler* masm,
Label* non_smi,
Label* slow) {
__ JumpIfNotSmi(r0, non_smi);
// The result of negating zero or the smallest negative smi is not a smi.
__ bic(ip, r0, Operand(0x80000000), SetCC);
__ b(eq, slow);
// Return '0 - value'.
__ rsb(r0, r0, Operand(0, RelocInfo::NONE));
__ Ret();
}
void UnaryOpStub::GenerateSmiCodeBitNot(MacroAssembler* masm,
Label* non_smi) {
__ JumpIfNotSmi(r0, non_smi);
// Flip bits and revert inverted smi-tag.
__ mvn(r0, Operand(r0));
__ bic(r0, r0, Operand(kSmiTagMask));
__ Ret();
}
// TODO(svenpanne): Use virtual functions instead of switch.
void UnaryOpStub::GenerateHeapNumberStub(MacroAssembler* masm) {
switch (op_) {
case Token::SUB:
GenerateHeapNumberStubSub(masm);
break;
case Token::BIT_NOT:
GenerateHeapNumberStubBitNot(masm);
break;
default:
UNREACHABLE();
}
}
void UnaryOpStub::GenerateHeapNumberStubSub(MacroAssembler* masm) {
Label non_smi, slow, call_builtin;
GenerateSmiCodeSub(masm, &non_smi, &call_builtin);
__ bind(&non_smi);
GenerateHeapNumberCodeSub(masm, &slow);
__ bind(&slow);
GenerateTypeTransition(masm);
__ bind(&call_builtin);
GenerateGenericCodeFallback(masm);
}
void UnaryOpStub::GenerateHeapNumberStubBitNot(MacroAssembler* masm) {
Label non_smi, slow;
GenerateSmiCodeBitNot(masm, &non_smi);
__ bind(&non_smi);
GenerateHeapNumberCodeBitNot(masm, &slow);
__ bind(&slow);
GenerateTypeTransition(masm);
}
void UnaryOpStub::GenerateHeapNumberCodeSub(MacroAssembler* masm,
Label* slow) {
EmitCheckForHeapNumber(masm, r0, r1, r6, slow);
// r0 is a heap number. Get a new heap number in r1.
if (mode_ == UNARY_OVERWRITE) {
__ ldr(r2, FieldMemOperand(r0, HeapNumber::kExponentOffset));
__ eor(r2, r2, Operand(HeapNumber::kSignMask)); // Flip sign.
__ str(r2, FieldMemOperand(r0, HeapNumber::kExponentOffset));
} else {
Label slow_allocate_heapnumber, heapnumber_allocated;
__ AllocateHeapNumber(r1, r2, r3, r6, &slow_allocate_heapnumber);
__ jmp(&heapnumber_allocated);
__ bind(&slow_allocate_heapnumber);
__ EnterInternalFrame();
__ push(r0);
__ CallRuntime(Runtime::kNumberAlloc, 0);
__ mov(r1, Operand(r0));
__ pop(r0);
__ LeaveInternalFrame();
__ bind(&heapnumber_allocated);
__ ldr(r3, FieldMemOperand(r0, HeapNumber::kMantissaOffset));
__ ldr(r2, FieldMemOperand(r0, HeapNumber::kExponentOffset));
__ str(r3, FieldMemOperand(r1, HeapNumber::kMantissaOffset));
__ eor(r2, r2, Operand(HeapNumber::kSignMask)); // Flip sign.
__ str(r2, FieldMemOperand(r1, HeapNumber::kExponentOffset));
__ mov(r0, Operand(r1));
}
__ Ret();
}
void UnaryOpStub::GenerateHeapNumberCodeBitNot(
MacroAssembler* masm, Label* slow) {
Label impossible;
EmitCheckForHeapNumber(masm, r0, r1, r6, slow);
// Convert the heap number is r0 to an untagged integer in r1.
__ ConvertToInt32(r0, r1, r2, r3, d0, slow);
// Do the bitwise operation and check if the result fits in a smi.
Label try_float;
__ mvn(r1, Operand(r1));
__ add(r2, r1, Operand(0x40000000), SetCC);
__ b(mi, &try_float);
// Tag the result as a smi and we're done.
__ mov(r0, Operand(r1, LSL, kSmiTagSize));
__ Ret();
// Try to store the result in a heap number.
__ bind(&try_float);
if (mode_ == UNARY_NO_OVERWRITE) {
Label slow_allocate_heapnumber, heapnumber_allocated;
// Allocate a new heap number without zapping r0, which we need if it fails.
__ AllocateHeapNumber(r2, r3, r4, r6, &slow_allocate_heapnumber);
__ jmp(&heapnumber_allocated);
__ bind(&slow_allocate_heapnumber);
__ EnterInternalFrame();
__ push(r0); // Push the heap number, not the untagged int32.
__ CallRuntime(Runtime::kNumberAlloc, 0);
__ mov(r2, r0); // Move the new heap number into r2.
// Get the heap number into r0, now that the new heap number is in r2.
__ pop(r0);
__ LeaveInternalFrame();
// Convert the heap number in r0 to an untagged integer in r1.
// This can't go slow-case because it's the same number we already
// converted once again.
__ ConvertToInt32(r0, r1, r3, r4, d0, &impossible);
__ mvn(r1, Operand(r1));
__ bind(&heapnumber_allocated);
__ mov(r0, r2); // Move newly allocated heap number to r0.
}
if (CpuFeatures::IsSupported(VFP3)) {
// Convert the int32 in r1 to the heap number in r0. r2 is corrupted.
CpuFeatures::Scope scope(VFP3);
__ vmov(s0, r1);
__ vcvt_f64_s32(d0, s0);
__ sub(r2, r0, Operand(kHeapObjectTag));
__ vstr(d0, r2, HeapNumber::kValueOffset);
__ Ret();
} else {
// WriteInt32ToHeapNumberStub does not trigger GC, so we do not
// have to set up a frame.
WriteInt32ToHeapNumberStub stub(r1, r0, r2);
__ Jump(stub.GetCode(), RelocInfo::CODE_TARGET);
}
__ bind(&impossible);
if (FLAG_debug_code) {
__ stop("Incorrect assumption in bit-not stub");
}
}
// TODO(svenpanne): Use virtual functions instead of switch.
void UnaryOpStub::GenerateGenericStub(MacroAssembler* masm) {
switch (op_) {
case Token::SUB:
GenerateGenericStubSub(masm);
break;
case Token::BIT_NOT:
GenerateGenericStubBitNot(masm);
break;
default:
UNREACHABLE();
}
}
void UnaryOpStub::GenerateGenericStubSub(MacroAssembler* masm) {
Label non_smi, slow;
GenerateSmiCodeSub(masm, &non_smi, &slow);
__ bind(&non_smi);
GenerateHeapNumberCodeSub(masm, &slow);
__ bind(&slow);
GenerateGenericCodeFallback(masm);
}
void UnaryOpStub::GenerateGenericStubBitNot(MacroAssembler* masm) {
Label non_smi, slow;
GenerateSmiCodeBitNot(masm, &non_smi);
__ bind(&non_smi);
GenerateHeapNumberCodeBitNot(masm, &slow);
__ bind(&slow);
GenerateGenericCodeFallback(masm);
}
void UnaryOpStub::GenerateGenericCodeFallback(MacroAssembler* masm) {
// Handle the slow case by jumping to the JavaScript builtin.
__ push(r0);
switch (op_) {
case Token::SUB:
__ InvokeBuiltin(Builtins::UNARY_MINUS, JUMP_FUNCTION);
break;
case Token::BIT_NOT:
__ InvokeBuiltin(Builtins::BIT_NOT, JUMP_FUNCTION);
break;
default:
UNREACHABLE();
}
}
void BinaryOpStub::GenerateTypeTransition(MacroAssembler* masm) {
Label get_result;
__ Push(r1, r0);
__ mov(r2, Operand(Smi::FromInt(MinorKey())));
__ mov(r1, Operand(Smi::FromInt(op_)));
__ mov(r0, Operand(Smi::FromInt(operands_type_)));
__ Push(r2, r1, r0);
__ TailCallExternalReference(
ExternalReference(IC_Utility(IC::kBinaryOp_Patch),
masm->isolate()),
5,
1);
}
void BinaryOpStub::GenerateTypeTransitionWithSavedArgs(
MacroAssembler* masm) {
UNIMPLEMENTED();
}
void BinaryOpStub::Generate(MacroAssembler* masm) {
switch (operands_type_) {
case BinaryOpIC::UNINITIALIZED:
GenerateTypeTransition(masm);
break;
case BinaryOpIC::SMI:
GenerateSmiStub(masm);
break;
case BinaryOpIC::INT32:
GenerateInt32Stub(masm);
break;
case BinaryOpIC::HEAP_NUMBER:
GenerateHeapNumberStub(masm);
break;
case BinaryOpIC::ODDBALL:
GenerateOddballStub(masm);
break;
case BinaryOpIC::BOTH_STRING:
GenerateBothStringStub(masm);
break;
case BinaryOpIC::STRING:
GenerateStringStub(masm);
break;
case BinaryOpIC::GENERIC:
GenerateGeneric(masm);
break;
default:
UNREACHABLE();
}
}
void BinaryOpStub::PrintName(StringStream* stream) {
const char* op_name = Token::Name(op_);
const char* overwrite_name;
switch (mode_) {
case NO_OVERWRITE: overwrite_name = "Alloc"; break;
case OVERWRITE_RIGHT: overwrite_name = "OverwriteRight"; break;
case OVERWRITE_LEFT: overwrite_name = "OverwriteLeft"; break;
default: overwrite_name = "UnknownOverwrite"; break;
}
stream->Add("BinaryOpStub_%s_%s_%s",
op_name,
overwrite_name,
BinaryOpIC::GetName(operands_type_));
}
void BinaryOpStub::GenerateSmiSmiOperation(MacroAssembler* masm) {
Register left = r1;
Register right = r0;
Register scratch1 = r7;
Register scratch2 = r9;
ASSERT(right.is(r0));
STATIC_ASSERT(kSmiTag == 0);
Label not_smi_result;
switch (op_) {
case Token::ADD:
__ add(right, left, Operand(right), SetCC); // Add optimistically.
__ Ret(vc);
__ sub(right, right, Operand(left)); // Revert optimistic add.
break;
case Token::SUB:
__ sub(right, left, Operand(right), SetCC); // Subtract optimistically.
__ Ret(vc);
__ sub(right, left, Operand(right)); // Revert optimistic subtract.
break;
case Token::MUL:
// Remove tag from one of the operands. This way the multiplication result
// will be a smi if it fits the smi range.
__ SmiUntag(ip, right);
// Do multiplication
// scratch1 = lower 32 bits of ip * left.
// scratch2 = higher 32 bits of ip * left.
__ smull(scratch1, scratch2, left, ip);
// Check for overflowing the smi range - no overflow if higher 33 bits of
// the result are identical.
__ mov(ip, Operand(scratch1, ASR, 31));
__ cmp(ip, Operand(scratch2));
__ b(ne, &not_smi_result);
// Go slow on zero result to handle -0.
__ tst(scratch1, Operand(scratch1));
__ mov(right, Operand(scratch1), LeaveCC, ne);
__ Ret(ne);
// We need -0 if we were multiplying a negative number with 0 to get 0.
// We know one of them was zero.
__ add(scratch2, right, Operand(left), SetCC);
__ mov(right, Operand(Smi::FromInt(0)), LeaveCC, pl);
__ Ret(pl); // Return smi 0 if the non-zero one was positive.
// We fall through here if we multiplied a negative number with 0, because
// that would mean we should produce -0.
break;
case Token::DIV:
// Check for power of two on the right hand side.
__ JumpIfNotPowerOfTwoOrZero(right, scratch1, &not_smi_result);
// Check for positive and no remainder (scratch1 contains right - 1).
__ orr(scratch2, scratch1, Operand(0x80000000u));
__ tst(left, scratch2);
__ b(ne, &not_smi_result);
// Perform division by shifting.
__ CountLeadingZeros(scratch1, scratch1, scratch2);
__ rsb(scratch1, scratch1, Operand(31));
__ mov(right, Operand(left, LSR, scratch1));
__ Ret();
break;
case Token::MOD:
// Check for two positive smis.
__ orr(scratch1, left, Operand(right));
__ tst(scratch1, Operand(0x80000000u | kSmiTagMask));
__ b(ne, &not_smi_result);
// Check for power of two on the right hand side.
__ JumpIfNotPowerOfTwoOrZero(right, scratch1, &not_smi_result);
// Perform modulus by masking.
__ and_(right, left, Operand(scratch1));
__ Ret();
break;
case Token::BIT_OR:
__ orr(right, left, Operand(right));
__ Ret();
break;
case Token::BIT_AND:
__ and_(right, left, Operand(right));
__ Ret();
break;
case Token::BIT_XOR:
__ eor(right, left, Operand(right));
__ Ret();
break;
case Token::SAR:
// Remove tags from right operand.
__ GetLeastBitsFromSmi(scratch1, right, 5);
__ mov(right, Operand(left, ASR, scratch1));
// Smi tag result.
__ bic(right, right, Operand(kSmiTagMask));
__ Ret();
break;
case Token::SHR:
// Remove tags from operands. We can't do this on a 31 bit number
// because then the 0s get shifted into bit 30 instead of bit 31.
__ SmiUntag(scratch1, left);
__ GetLeastBitsFromSmi(scratch2, right, 5);
__ mov(scratch1, Operand(scratch1, LSR, scratch2));
// Unsigned shift is not allowed to produce a negative number, so
// check the sign bit and the sign bit after Smi tagging.
__ tst(scratch1, Operand(0xc0000000));
__ b(ne, &not_smi_result);
// Smi tag result.
__ SmiTag(right, scratch1);
__ Ret();
break;
case Token::SHL:
// Remove tags from operands.
__ SmiUntag(scratch1, left);
__ GetLeastBitsFromSmi(scratch2, right, 5);
__ mov(scratch1, Operand(scratch1, LSL, scratch2));
// Check that the signed result fits in a Smi.
__ add(scratch2, scratch1, Operand(0x40000000), SetCC);
__ b(mi, &not_smi_result);
__ SmiTag(right, scratch1);
__ Ret();
break;
default:
UNREACHABLE();
}
__ bind(&not_smi_result);
}
void BinaryOpStub::GenerateFPOperation(MacroAssembler* masm,
bool smi_operands,
Label* not_numbers,
Label* gc_required) {
Register left = r1;
Register right = r0;
Register scratch1 = r7;
Register scratch2 = r9;
Register scratch3 = r4;
ASSERT(smi_operands || (not_numbers != NULL));
if (smi_operands && FLAG_debug_code) {
__ AbortIfNotSmi(left);
__ AbortIfNotSmi(right);
}
Register heap_number_map = r6;
__ LoadRoot(heap_number_map, Heap::kHeapNumberMapRootIndex);
switch (op_) {
case Token::ADD:
case Token::SUB:
case Token::MUL:
case Token::DIV:
case Token::MOD: {
// Load left and right operands into d6 and d7 or r0/r1 and r2/r3
// depending on whether VFP3 is available or not.
FloatingPointHelper::Destination destination =
CpuFeatures::IsSupported(VFP3) &&
op_ != Token::MOD ?
FloatingPointHelper::kVFPRegisters :
FloatingPointHelper::kCoreRegisters;
// Allocate new heap number for result.
Register result = r5;
GenerateHeapResultAllocation(
masm, result, heap_number_map, scratch1, scratch2, gc_required);
// Load the operands.
if (smi_operands) {
FloatingPointHelper::LoadSmis(masm, destination, scratch1, scratch2);
} else {
FloatingPointHelper::LoadOperands(masm,
destination,
heap_number_map,
scratch1,
scratch2,
not_numbers);
}
// Calculate the result.
if (destination == FloatingPointHelper::kVFPRegisters) {
// Using VFP registers:
// d6: Left value
// d7: Right value
CpuFeatures::Scope scope(VFP3);
switch (op_) {
case Token::ADD:
__ vadd(d5, d6, d7);
break;
case Token::SUB:
__ vsub(d5, d6, d7);
break;
case Token::MUL:
__ vmul(d5, d6, d7);
break;
case Token::DIV:
__ vdiv(d5, d6, d7);
break;
default:
UNREACHABLE();
}
__ sub(r0, result, Operand(kHeapObjectTag));
__ vstr(d5, r0, HeapNumber::kValueOffset);
__ add(r0, r0, Operand(kHeapObjectTag));
__ Ret();
} else {
// Call the C function to handle the double operation.
FloatingPointHelper::CallCCodeForDoubleOperation(masm,
op_,
result,
scratch1);
if (FLAG_debug_code) {
__ stop("Unreachable code.");
}
}
break;
}
case Token::BIT_OR:
case Token::BIT_XOR:
case Token::BIT_AND:
case Token::SAR:
case Token::SHR:
case Token::SHL: {
if (smi_operands) {
__ SmiUntag(r3, left);
__ SmiUntag(r2, right);
} else {
// Convert operands to 32-bit integers. Right in r2 and left in r3.
FloatingPointHelper::ConvertNumberToInt32(masm,
left,
r3,
heap_number_map,
scratch1,
scratch2,
scratch3,
d0,
not_numbers);
FloatingPointHelper::ConvertNumberToInt32(masm,
right,
r2,
heap_number_map,
scratch1,
scratch2,
scratch3,
d0,
not_numbers);
}
Label result_not_a_smi;
switch (op_) {
case Token::BIT_OR:
__ orr(r2, r3, Operand(r2));
break;
case Token::BIT_XOR:
__ eor(r2, r3, Operand(r2));
break;
case Token::BIT_AND:
__ and_(r2, r3, Operand(r2));
break;
case Token::SAR:
// Use only the 5 least significant bits of the shift count.
__ GetLeastBitsFromInt32(r2, r2, 5);
__ mov(r2, Operand(r3, ASR, r2));
break;
case Token::SHR:
// Use only the 5 least significant bits of the shift count.
__ GetLeastBitsFromInt32(r2, r2, 5);
__ mov(r2, Operand(r3, LSR, r2), SetCC);
// SHR is special because it is required to produce a positive answer.
// The code below for writing into heap numbers isn't capable of
// writing the register as an unsigned int so we go to slow case if we
// hit this case.
if (CpuFeatures::IsSupported(VFP3)) {
__ b(mi, &result_not_a_smi);
} else {
__ b(mi, not_numbers);
}
break;
case Token::SHL:
// Use only the 5 least significant bits of the shift count.
__ GetLeastBitsFromInt32(r2, r2, 5);
__ mov(r2, Operand(r3, LSL, r2));
break;
default:
UNREACHABLE();
}
// Check that the *signed* result fits in a smi.
__ add(r3, r2, Operand(0x40000000), SetCC);
__ b(mi, &result_not_a_smi);
__ SmiTag(r0, r2);
__ Ret();
// Allocate new heap number for result.
__ bind(&result_not_a_smi);
Register result = r5;
if (smi_operands) {
__ AllocateHeapNumber(
result, scratch1, scratch2, heap_number_map, gc_required);
} else {
GenerateHeapResultAllocation(
masm, result, heap_number_map, scratch1, scratch2, gc_required);
}
// r2: Answer as signed int32.
// r5: Heap number to write answer into.
// Nothing can go wrong now, so move the heap number to r0, which is the
// result.
__ mov(r0, Operand(r5));
if (CpuFeatures::IsSupported(VFP3)) {
// Convert the int32 in r2 to the heap number in r0. r3 is corrupted. As
// mentioned above SHR needs to always produce a positive result.
CpuFeatures::Scope scope(VFP3);
__ vmov(s0, r2);
if (op_ == Token::SHR) {
__ vcvt_f64_u32(d0, s0);
} else {
__ vcvt_f64_s32(d0, s0);
}
__ sub(r3, r0, Operand(kHeapObjectTag));
__ vstr(d0, r3, HeapNumber::kValueOffset);
__ Ret();
} else {
// Tail call that writes the int32 in r2 to the heap number in r0, using
// r3 as scratch. r0 is preserved and returned.
WriteInt32ToHeapNumberStub stub(r2, r0, r3);
__ TailCallStub(&stub);
}
break;
}
default:
UNREACHABLE();
}
}
// Generate the smi code. If the operation on smis are successful this return is
// generated. If the result is not a smi and heap number allocation is not
// requested the code falls through. If number allocation is requested but a
// heap number cannot be allocated the code jumps to the lable gc_required.
void BinaryOpStub::GenerateSmiCode(
MacroAssembler* masm,
Label* use_runtime,
Label* gc_required,
SmiCodeGenerateHeapNumberResults allow_heapnumber_results) {
Label not_smis;
Register left = r1;
Register right = r0;
Register scratch1 = r7;
// Perform combined smi check on both operands.
__ orr(scratch1, left, Operand(right));
STATIC_ASSERT(kSmiTag == 0);
__ JumpIfNotSmi(scratch1, &not_smis);
// If the smi-smi operation results in a smi return is generated.
GenerateSmiSmiOperation(masm);
// If heap number results are possible generate the result in an allocated
// heap number.
if (allow_heapnumber_results == ALLOW_HEAPNUMBER_RESULTS) {
GenerateFPOperation(masm, true, use_runtime, gc_required);
}
__ bind(&not_smis);
}
void BinaryOpStub::GenerateSmiStub(MacroAssembler* masm) {
Label not_smis, call_runtime;
if (result_type_ == BinaryOpIC::UNINITIALIZED ||
result_type_ == BinaryOpIC::SMI) {
// Only allow smi results.
GenerateSmiCode(masm, &call_runtime, NULL, NO_HEAPNUMBER_RESULTS);
} else {
// Allow heap number result and don't make a transition if a heap number
// cannot be allocated.
GenerateSmiCode(masm,
&call_runtime,
&call_runtime,
ALLOW_HEAPNUMBER_RESULTS);
}
// Code falls through if the result is not returned as either a smi or heap
// number.
GenerateTypeTransition(masm);
__ bind(&call_runtime);
GenerateCallRuntime(masm);
}
void BinaryOpStub::GenerateStringStub(MacroAssembler* masm) {
ASSERT(operands_type_ == BinaryOpIC::STRING);
ASSERT(op_ == Token::ADD);
// Try to add arguments as strings, otherwise, transition to the generic
// BinaryOpIC type.
GenerateAddStrings(masm);
GenerateTypeTransition(masm);
}
void BinaryOpStub::GenerateBothStringStub(MacroAssembler* masm) {
Label call_runtime;
ASSERT(operands_type_ == BinaryOpIC::BOTH_STRING);
ASSERT(op_ == Token::ADD);
// If both arguments are strings, call the string add stub.
// Otherwise, do a transition.
// Registers containing left and right operands respectively.
Register left = r1;
Register right = r0;
// Test if left operand is a string.
__ JumpIfSmi(left, &call_runtime);
__ CompareObjectType(left, r2, r2, FIRST_NONSTRING_TYPE);
__ b(ge, &call_runtime);
// Test if right operand is a string.
__ JumpIfSmi(right, &call_runtime);
__ CompareObjectType(right, r2, r2, FIRST_NONSTRING_TYPE);
__ b(ge, &call_runtime);
StringAddStub string_add_stub(NO_STRING_CHECK_IN_STUB);
GenerateRegisterArgsPush(masm);
__ TailCallStub(&string_add_stub);
__ bind(&call_runtime);
GenerateTypeTransition(masm);
}
void BinaryOpStub::GenerateInt32Stub(MacroAssembler* masm) {
ASSERT(operands_type_ == BinaryOpIC::INT32);
Register left = r1;
Register right = r0;
Register scratch1 = r7;
Register scratch2 = r9;
DwVfpRegister double_scratch = d0;
SwVfpRegister single_scratch = s3;
Register heap_number_result = no_reg;
Register heap_number_map = r6;
__ LoadRoot(heap_number_map, Heap::kHeapNumberMapRootIndex);
Label call_runtime;
// Labels for type transition, used for wrong input or output types.
// Both label are currently actually bound to the same position. We use two
// different label to differentiate the cause leading to type transition.
Label transition;
// Smi-smi fast case.
Label skip;
__ orr(scratch1, left, right);
__ JumpIfNotSmi(scratch1, &skip);
GenerateSmiSmiOperation(masm);
// Fall through if the result is not a smi.
__ bind(&skip);
switch (op_) {
case Token::ADD:
case Token::SUB:
case Token::MUL:
case Token::DIV:
case Token::MOD: {
// Load both operands and check that they are 32-bit integer.
// Jump to type transition if they are not. The registers r0 and r1 (right
// and left) are preserved for the runtime call.
FloatingPointHelper::Destination destination =
(CpuFeatures::IsSupported(VFP3) && op_ != Token::MOD)
? FloatingPointHelper::kVFPRegisters
: FloatingPointHelper::kCoreRegisters;
FloatingPointHelper::LoadNumberAsInt32Double(masm,
right,
destination,
d7,
r2,
r3,
heap_number_map,
scratch1,
scratch2,
s0,
&transition);
FloatingPointHelper::LoadNumberAsInt32Double(masm,
left,
destination,
d6,
r4,
r5,
heap_number_map,
scratch1,
scratch2,
s0,
&transition);
if (destination == FloatingPointHelper::kVFPRegisters) {
CpuFeatures::Scope scope(VFP3);
Label return_heap_number;
switch (op_) {
case Token::ADD:
__ vadd(d5, d6, d7);
break;
case Token::SUB:
__ vsub(d5, d6, d7);
break;
case Token::MUL:
__ vmul(d5, d6, d7);
break;
case Token::DIV:
__ vdiv(d5, d6, d7);
break;
default:
UNREACHABLE();
}
if (op_ != Token::DIV) {
// These operations produce an integer result.
// Try to return a smi if we can.
// Otherwise return a heap number if allowed, or jump to type
// transition.
__ EmitVFPTruncate(kRoundToZero,
single_scratch,
d5,
scratch1,
scratch2);
if (result_type_ <= BinaryOpIC::INT32) {
// If the ne condition is set, result does
// not fit in a 32-bit integer.
__ b(ne, &transition);
}
// Check if the result fits in a smi.
__ vmov(scratch1, single_scratch);
__ add(scratch2, scratch1, Operand(0x40000000), SetCC);
// If not try to return a heap number.
__ b(mi, &return_heap_number);
// Check for minus zero. Return heap number for minus zero.
Label not_zero;
__ cmp(scratch1, Operand::Zero());
__ b(ne, &not_zero);
__ vmov(scratch2, d5.high());
__ tst(scratch2, Operand(HeapNumber::kSignMask));
__ b(ne, &return_heap_number);
__ bind(&not_zero);
// Tag the result and return.
__ SmiTag(r0, scratch1);
__ Ret();
} else {
// DIV just falls through to allocating a heap number.
}
__ bind(&return_heap_number);
// Return a heap number, or fall through to type transition or runtime
// call if we can't.
if (result_type_ >= ((op_ == Token::DIV) ? BinaryOpIC::HEAP_NUMBER
: BinaryOpIC::INT32)) {
// We are using vfp registers so r5 is available.
heap_number_result = r5;
GenerateHeapResultAllocation(masm,
heap_number_result,
heap_number_map,
scratch1,
scratch2,
&call_runtime);
__ sub(r0, heap_number_result, Operand(kHeapObjectTag));
__ vstr(d5, r0, HeapNumber::kValueOffset);
__ mov(r0, heap_number_result);
__ Ret();
}
// A DIV operation expecting an integer result falls through
// to type transition.
} else {
// We preserved r0 and r1 to be able to call runtime.
// Save the left value on the stack.
__ Push(r5, r4);
Label pop_and_call_runtime;
// Allocate a heap number to store the result.
heap_number_result = r5;
GenerateHeapResultAllocation(masm,
heap_number_result,
heap_number_map,
scratch1,
scratch2,
&pop_and_call_runtime);
// Load the left value from the value saved on the stack.
__ Pop(r1, r0);
// Call the C function to handle the double operation.
FloatingPointHelper::CallCCodeForDoubleOperation(
masm, op_, heap_number_result, scratch1);
if (FLAG_debug_code) {
__ stop("Unreachable code.");
}
__ bind(&pop_and_call_runtime);
__ Drop(2);
__ b(&call_runtime);
}
break;
}
case Token::BIT_OR:
case Token::BIT_XOR:
case Token::BIT_AND:
case Token::SAR:
case Token::SHR:
case Token::SHL: {
Label return_heap_number;
Register scratch3 = r5;
// Convert operands to 32-bit integers. Right in r2 and left in r3. The
// registers r0 and r1 (right and left) are preserved for the runtime
// call.
FloatingPointHelper::LoadNumberAsInt32(masm,
left,
r3,
heap_number_map,
scratch1,
scratch2,
scratch3,
d0,
&transition);
FloatingPointHelper::LoadNumberAsInt32(masm,
right,
r2,
heap_number_map,
scratch1,
scratch2,
scratch3,
d0,
&transition);
// The ECMA-262 standard specifies that, for shift operations, only the
// 5 least significant bits of the shift value should be used.
switch (op_) {
case Token::BIT_OR:
__ orr(r2, r3, Operand(r2));
break;
case Token::BIT_XOR:
__ eor(r2, r3, Operand(r2));
break;
case Token::BIT_AND:
__ and_(r2, r3, Operand(r2));
break;
case Token::SAR:
__ and_(r2, r2, Operand(0x1f));
__ mov(r2, Operand(r3, ASR, r2));
break;
case Token::SHR:
__ and_(r2, r2, Operand(0x1f));
__ mov(r2, Operand(r3, LSR, r2), SetCC);
// SHR is special because it is required to produce a positive answer.
// We only get a negative result if the shift value (r2) is 0.
// This result cannot be respresented as a signed 32-bit integer, try
// to return a heap number if we can.
// The non vfp3 code does not support this special case, so jump to
// runtime if we don't support it.
if (CpuFeatures::IsSupported(VFP3)) {
__ b(mi, (result_type_ <= BinaryOpIC::INT32)
? &transition
: &return_heap_number);
} else {
__ b(mi, (result_type_ <= BinaryOpIC::INT32)
? &transition
: &call_runtime);
}
break;
case Token::SHL:
__ and_(r2, r2, Operand(0x1f));
__ mov(r2, Operand(r3, LSL, r2));
break;
default:
UNREACHABLE();
}
// Check if the result fits in a smi.
__ add(scratch1, r2, Operand(0x40000000), SetCC);
// If not try to return a heap number. (We know the result is an int32.)
__ b(mi, &return_heap_number);
// Tag the result and return.
__ SmiTag(r0, r2);
__ Ret();
__ bind(&return_heap_number);
heap_number_result = r5;
GenerateHeapResultAllocation(masm,
heap_number_result,
heap_number_map,
scratch1,
scratch2,
&call_runtime);
if (CpuFeatures::IsSupported(VFP3)) {
CpuFeatures::Scope scope(VFP3);
if (op_ != Token::SHR) {
// Convert the result to a floating point value.
__ vmov(double_scratch.low(), r2);
__ vcvt_f64_s32(double_scratch, double_scratch.low());
} else {
// The result must be interpreted as an unsigned 32-bit integer.
__ vmov(double_scratch.low(), r2);
__ vcvt_f64_u32(double_scratch, double_scratch.low());
}
// Store the result.
__ sub(r0, heap_number_result, Operand(kHeapObjectTag));
__ vstr(double_scratch, r0, HeapNumber::kValueOffset);
__ mov(r0, heap_number_result);
__ Ret();
} else {
// Tail call that writes the int32 in r2 to the heap number in r0, using
// r3 as scratch. r0 is preserved and returned.
__ mov(r0, r5);
WriteInt32ToHeapNumberStub stub(r2, r0, r3);
__ TailCallStub(&stub);
}
break;
}
default:
UNREACHABLE();
}
// We never expect DIV to yield an integer result, so we always generate
// type transition code for DIV operations expecting an integer result: the
// code will fall through to this type transition.
if (transition.is_linked() ||
((op_ == Token::DIV) && (result_type_ <= BinaryOpIC::INT32))) {
__ bind(&transition);
GenerateTypeTransition(masm);
}
__ bind(&call_runtime);
GenerateCallRuntime(masm);
}
void BinaryOpStub::GenerateOddballStub(MacroAssembler* masm) {
Label call_runtime;
if (op_ == Token::ADD) {
// Handle string addition here, because it is the only operation
// that does not do a ToNumber conversion on the operands.
GenerateAddStrings(masm);
}
// Convert oddball arguments to numbers.
Label check, done;
__ CompareRoot(r1, Heap::kUndefinedValueRootIndex);
__ b(ne, &check);
if (Token::IsBitOp(op_)) {
__ mov(r1, Operand(Smi::FromInt(0)));
} else {
__ LoadRoot(r1, Heap::kNanValueRootIndex);
}
__ jmp(&done);
__ bind(&check);
__ CompareRoot(r0, Heap::kUndefinedValueRootIndex);
__ b(ne, &done);
if (Token::IsBitOp(op_)) {
__ mov(r0, Operand(Smi::FromInt(0)));
} else {
__ LoadRoot(r0, Heap::kNanValueRootIndex);
}
__ bind(&done);
GenerateHeapNumberStub(masm);
}
void BinaryOpStub::GenerateHeapNumberStub(MacroAssembler* masm) {
Label call_runtime;
GenerateFPOperation(masm, false, &call_runtime, &call_runtime);
__ bind(&call_runtime);
GenerateCallRuntime(masm);
}
void BinaryOpStub::GenerateGeneric(MacroAssembler* masm) {
Label call_runtime, call_string_add_or_runtime;
GenerateSmiCode(masm, &call_runtime, &call_runtime, ALLOW_HEAPNUMBER_RESULTS);
GenerateFPOperation(masm, false, &call_string_add_or_runtime, &call_runtime);
__ bind(&call_string_add_or_runtime);
if (op_ == Token::ADD) {
GenerateAddStrings(masm);
}
__ bind(&call_runtime);
GenerateCallRuntime(masm);
}
void BinaryOpStub::GenerateAddStrings(MacroAssembler* masm) {
ASSERT(op_ == Token::ADD);
Label left_not_string, call_runtime;
Register left = r1;
Register right = r0;
// Check if left argument is a string.
__ JumpIfSmi(left, &left_not_string);
__ CompareObjectType(left, r2, r2, FIRST_NONSTRING_TYPE);
__ b(ge, &left_not_string);
StringAddStub string_add_left_stub(NO_STRING_CHECK_LEFT_IN_STUB);
GenerateRegisterArgsPush(masm);
__ TailCallStub(&string_add_left_stub);
// Left operand is not a string, test right.
__ bind(&left_not_string);
__ JumpIfSmi(right, &call_runtime);
__ CompareObjectType(right, r2, r2, FIRST_NONSTRING_TYPE);
__ b(ge, &call_runtime);
StringAddStub string_add_right_stub(NO_STRING_CHECK_RIGHT_IN_STUB);
GenerateRegisterArgsPush(masm);
__ TailCallStub(&string_add_right_stub);
// At least one argument is not a string.
__ bind(&call_runtime);
}
void BinaryOpStub::GenerateCallRuntime(MacroAssembler* masm) {
GenerateRegisterArgsPush(masm);
switch (op_) {
case Token::ADD:
__ InvokeBuiltin(Builtins::ADD, JUMP_FUNCTION);
break;
case Token::SUB:
__ InvokeBuiltin(Builtins::SUB, JUMP_FUNCTION);
break;
case Token::MUL:
__ InvokeBuiltin(Builtins::MUL, JUMP_FUNCTION);
break;
case Token::DIV:
__ InvokeBuiltin(Builtins::DIV, JUMP_FUNCTION);
break;
case Token::MOD:
__ InvokeBuiltin(Builtins::MOD, JUMP_FUNCTION);
break;
case Token::BIT_OR:
__ InvokeBuiltin(Builtins::BIT_OR, JUMP_FUNCTION);
break;
case Token::BIT_AND:
__ InvokeBuiltin(Builtins::BIT_AND, JUMP_FUNCTION);
break;
case Token::BIT_XOR:
__ InvokeBuiltin(Builtins::BIT_XOR, JUMP_FUNCTION);
break;
case Token::SAR:
__ InvokeBuiltin(Builtins::SAR, JUMP_FUNCTION);
break;
case Token::SHR:
__ InvokeBuiltin(Builtins::SHR, JUMP_FUNCTION);
break;
case Token::SHL:
__ InvokeBuiltin(Builtins::SHL, JUMP_FUNCTION);
break;
default:
UNREACHABLE();
}
}
void BinaryOpStub::GenerateHeapResultAllocation(MacroAssembler* masm,
Register result,
Register heap_number_map,
Register scratch1,
Register scratch2,
Label* gc_required) {
// Code below will scratch result if allocation fails. To keep both arguments
// intact for the runtime call result cannot be one of these.
ASSERT(!result.is(r0) && !result.is(r1));
if (mode_ == OVERWRITE_LEFT || mode_ == OVERWRITE_RIGHT) {
Label skip_allocation, allocated;
Register overwritable_operand = mode_ == OVERWRITE_LEFT ? r1 : r0;
// If the overwritable operand is already an object, we skip the
// allocation of a heap number.
__ JumpIfNotSmi(overwritable_operand, &skip_allocation);
// Allocate a heap number for the result.
__ AllocateHeapNumber(
result, scratch1, scratch2, heap_number_map, gc_required);
__ b(&allocated);
__ bind(&skip_allocation);
// Use object holding the overwritable operand for result.
__ mov(result, Operand(overwritable_operand));
__ bind(&allocated);
} else {
ASSERT(mode_ == NO_OVERWRITE);
__ AllocateHeapNumber(
result, scratch1, scratch2, heap_number_map, gc_required);
}
}
void BinaryOpStub::GenerateRegisterArgsPush(MacroAssembler* masm) {
__ Push(r1, r0);
}
void TranscendentalCacheStub::Generate(MacroAssembler* masm) {
// Untagged case: double input in d2, double result goes
// into d2.
// Tagged case: tagged input on top of stack and in r0,
// tagged result (heap number) goes into r0.
Label input_not_smi;
Label loaded;
Label calculate;
Label invalid_cache;
const Register scratch0 = r9;
const Register scratch1 = r7;
const Register cache_entry = r0;
const bool tagged = (argument_type_ == TAGGED);
if (CpuFeatures::IsSupported(VFP3)) {
CpuFeatures::Scope scope(VFP3);
if (tagged) {
// Argument is a number and is on stack and in r0.
// Load argument and check if it is a smi.
__ JumpIfNotSmi(r0, &input_not_smi);
// Input is a smi. Convert to double and load the low and high words
// of the double into r2, r3.
__ IntegerToDoubleConversionWithVFP3(r0, r3, r2);
__ b(&loaded);
__ bind(&input_not_smi);
// Check if input is a HeapNumber.
__ CheckMap(r0,
r1,
Heap::kHeapNumberMapRootIndex,
&calculate,
DONT_DO_SMI_CHECK);
// Input is a HeapNumber. Load it to a double register and store the
// low and high words into r2, r3.
__ vldr(d0, FieldMemOperand(r0, HeapNumber::kValueOffset));
__ vmov(r2, r3, d0);
} else {
// Input is untagged double in d2. Output goes to d2.
__ vmov(r2, r3, d2);
}
__ bind(&loaded);
// r2 = low 32 bits of double value
// r3 = high 32 bits of double value
// Compute hash (the shifts are arithmetic):
// h = (low ^ high); h ^= h >> 16; h ^= h >> 8; h = h & (cacheSize - 1);
__ eor(r1, r2, Operand(r3));
__ eor(r1, r1, Operand(r1, ASR, 16));
__ eor(r1, r1, Operand(r1, ASR, 8));
ASSERT(IsPowerOf2(TranscendentalCache::SubCache::kCacheSize));
__ And(r1, r1, Operand(TranscendentalCache::SubCache::kCacheSize - 1));
// r2 = low 32 bits of double value.
// r3 = high 32 bits of double value.
// r1 = TranscendentalCache::hash(double value).
Isolate* isolate = masm->isolate();
ExternalReference cache_array =
ExternalReference::transcendental_cache_array_address(isolate);
__ mov(cache_entry, Operand(cache_array));
// cache_entry points to cache array.
int cache_array_index
= type_ * sizeof(isolate->transcendental_cache()->caches_[0]);
__ ldr(cache_entry, MemOperand(cache_entry, cache_array_index));
// r0 points to the cache for the type type_.
// If NULL, the cache hasn't been initialized yet, so go through runtime.
__ cmp(cache_entry, Operand(0, RelocInfo::NONE));
__ b(eq, &invalid_cache);
#ifdef DEBUG
// Check that the layout of cache elements match expectations.
{ TranscendentalCache::SubCache::Element test_elem[2];
char* elem_start = reinterpret_cast<char*>(&test_elem[0]);
char* elem2_start = reinterpret_cast<char*>(&test_elem[1]);
char* elem_in0 = reinterpret_cast<char*>(&(test_elem[0].in[0]));
char* elem_in1 = reinterpret_cast<char*>(&(test_elem[0].in[1]));
char* elem_out = reinterpret_cast<char*>(&(test_elem[0].output));
CHECK_EQ(12, elem2_start - elem_start); // Two uint_32's and a pointer.
CHECK_EQ(0, elem_in0 - elem_start);
CHECK_EQ(kIntSize, elem_in1 - elem_start);
CHECK_EQ(2 * kIntSize, elem_out - elem_start);
}
#endif
// Find the address of the r1'st entry in the cache, i.e., &r0[r1*12].
__ add(r1, r1, Operand(r1, LSL, 1));
__ add(cache_entry, cache_entry, Operand(r1, LSL, 2));
// Check if cache matches: Double value is stored in uint32_t[2] array.
__ ldm(ia, cache_entry, r4.bit() | r5.bit() | r6.bit());
__ cmp(r2, r4);
__ b(ne, &calculate);
__ cmp(r3, r5);
__ b(ne, &calculate);
// Cache hit. Load result, cleanup and return.
if (tagged) {
// Pop input value from stack and load result into r0.
__ pop();
__ mov(r0, Operand(r6));
} else {
// Load result into d2.
__ vldr(d2, FieldMemOperand(r6, HeapNumber::kValueOffset));
}
__ Ret();
} // if (CpuFeatures::IsSupported(VFP3))
__ bind(&calculate);
if (tagged) {
__ bind(&invalid_cache);
ExternalReference runtime_function =
ExternalReference(RuntimeFunction(), masm->isolate());
__ TailCallExternalReference(runtime_function, 1, 1);
} else {
if (!CpuFeatures::IsSupported(VFP3)) UNREACHABLE();
CpuFeatures::Scope scope(VFP3);
Label no_update;
Label skip_cache;
// Call C function to calculate the result and update the cache.
// Register r0 holds precalculated cache entry address; preserve
// it on the stack and pop it into register cache_entry after the
// call.
__ push(cache_entry);
GenerateCallCFunction(masm, scratch0);
__ GetCFunctionDoubleResult(d2);
// Try to update the cache. If we cannot allocate a
// heap number, we return the result without updating.
__ pop(cache_entry);
__ LoadRoot(r5, Heap::kHeapNumberMapRootIndex);
__ AllocateHeapNumber(r6, scratch0, scratch1, r5, &no_update);
__ vstr(d2, FieldMemOperand(r6, HeapNumber::kValueOffset));
__ stm(ia, cache_entry, r2.bit() | r3.bit() | r6.bit());
__ Ret();
__ bind(&invalid_cache);
// The cache is invalid. Call runtime which will recreate the
// cache.
__ LoadRoot(r5, Heap::kHeapNumberMapRootIndex);
__ AllocateHeapNumber(r0, scratch0, scratch1, r5, &skip_cache);
__ vstr(d2, FieldMemOperand(r0, HeapNumber::kValueOffset));
__ EnterInternalFrame();
__ push(r0);
__ CallRuntime(RuntimeFunction(), 1);
__ LeaveInternalFrame();
__ vldr(d2, FieldMemOperand(r0, HeapNumber::kValueOffset));
__ Ret();
__ bind(&skip_cache);
// Call C function to calculate the result and answer directly
// without updating the cache.
GenerateCallCFunction(masm, scratch0);
__ GetCFunctionDoubleResult(d2);
__ bind(&no_update);
// We return the value in d2 without adding it to the cache, but
// we cause a scavenging GC so that future allocations will succeed.
__ EnterInternalFrame();
// Allocate an aligned object larger than a HeapNumber.
ASSERT(4 * kPointerSize >= HeapNumber::kSize);
__ mov(scratch0, Operand(4 * kPointerSize));
__ push(scratch0);
__ CallRuntimeSaveDoubles(Runtime::kAllocateInNewSpace);
__ LeaveInternalFrame();
__ Ret();
}
}
void TranscendentalCacheStub::GenerateCallCFunction(MacroAssembler* masm,
Register scratch) {
Isolate* isolate = masm->isolate();
__ push(lr);
__ PrepareCallCFunction(0, 1, scratch);
if (masm->use_eabi_hardfloat()) {
__ vmov(d0, d2);
} else {
__ vmov(r0, r1, d2);
}
switch (type_) {
case TranscendentalCache::SIN:
__ CallCFunction(ExternalReference::math_sin_double_function(isolate),
0, 1);
break;
case TranscendentalCache::COS:
__ CallCFunction(ExternalReference::math_cos_double_function(isolate),
0, 1);
break;
case TranscendentalCache::LOG:
__ CallCFunction(ExternalReference::math_log_double_function(isolate),
0, 1);
break;
default:
UNIMPLEMENTED();
break;
}
__ pop(lr);
}
Runtime::FunctionId TranscendentalCacheStub::RuntimeFunction() {
switch (type_) {
// Add more cases when necessary.
case TranscendentalCache::SIN: return Runtime::kMath_sin;
case TranscendentalCache::COS: return Runtime::kMath_cos;
case TranscendentalCache::LOG: return Runtime::kMath_log;
default:
UNIMPLEMENTED();
return Runtime::kAbort;
}
}
void StackCheckStub::Generate(MacroAssembler* masm) {
__ TailCallRuntime(Runtime::kStackGuard, 0, 1);
}
void MathPowStub::Generate(MacroAssembler* masm) {
Label call_runtime;
if (CpuFeatures::IsSupported(VFP3)) {
CpuFeatures::Scope scope(VFP3);
Label base_not_smi;
Label exponent_not_smi;
Label convert_exponent;
const Register base = r0;
const Register exponent = r1;
const Register heapnumbermap = r5;
const Register heapnumber = r6;
const DoubleRegister double_base = d0;
const DoubleRegister double_exponent = d1;
const DoubleRegister double_result = d2;
const SwVfpRegister single_scratch = s0;
const Register scratch = r9;
const Register scratch2 = r7;
__ LoadRoot(heapnumbermap, Heap::kHeapNumberMapRootIndex);
__ ldr(base, MemOperand(sp, 1 * kPointerSize));
__ ldr(exponent, MemOperand(sp, 0 * kPointerSize));
// Convert base to double value and store it in d0.
__ JumpIfNotSmi(base, &base_not_smi);
// Base is a Smi. Untag and convert it.
__ SmiUntag(base);
__ vmov(single_scratch, base);
__ vcvt_f64_s32(double_base, single_scratch);
__ b(&convert_exponent);
__ bind(&base_not_smi);
__ ldr(scratch, FieldMemOperand(base, JSObject::kMapOffset));
__ cmp(scratch, heapnumbermap);
__ b(ne, &call_runtime);
// Base is a heapnumber. Load it into double register.
__ vldr(double_base, FieldMemOperand(base, HeapNumber::kValueOffset));
__ bind(&convert_exponent);
__ JumpIfNotSmi(exponent, &exponent_not_smi);
__ SmiUntag(exponent);
// The base is in a double register and the exponent is
// an untagged smi. Allocate a heap number and call a
// C function for integer exponents. The register containing
// the heap number is callee-saved.
__ AllocateHeapNumber(heapnumber,
scratch,
scratch2,
heapnumbermap,
&call_runtime);
__ push(lr);
__ PrepareCallCFunction(1, 1, scratch);
__ SetCallCDoubleArguments(double_base, exponent);
__ CallCFunction(
ExternalReference::power_double_int_function(masm->isolate()),
1, 1);
__ pop(lr);
__ GetCFunctionDoubleResult(double_result);
__ vstr(double_result,
FieldMemOperand(heapnumber, HeapNumber::kValueOffset));
__ mov(r0, heapnumber);
__ Ret(2 * kPointerSize);
__ bind(&exponent_not_smi);
__ ldr(scratch, FieldMemOperand(exponent, JSObject::kMapOffset));
__ cmp(scratch, heapnumbermap);
__ b(ne, &call_runtime);
// Exponent is a heapnumber. Load it into double register.
__ vldr(double_exponent,
FieldMemOperand(exponent, HeapNumber::kValueOffset));
// The base and the exponent are in double registers.
// Allocate a heap number and call a C function for
// double exponents. The register containing
// the heap number is callee-saved.
__ AllocateHeapNumber(heapnumber,
scratch,
scratch2,
heapnumbermap,
&call_runtime);
__ push(lr);
__ PrepareCallCFunction(0, 2, scratch);
__ SetCallCDoubleArguments(double_base, double_exponent);
__ CallCFunction(
ExternalReference::power_double_double_function(masm->isolate()),
0, 2);
__ pop(lr);
__ GetCFunctionDoubleResult(double_result);
__ vstr(double_result,
FieldMemOperand(heapnumber, HeapNumber::kValueOffset));
__ mov(r0, heapnumber);
__ Ret(2 * kPointerSize);
}
__ bind(&call_runtime);
__ TailCallRuntime(Runtime::kMath_pow_cfunction, 2, 1);
}
bool CEntryStub::NeedsImmovableCode() {
return true;
}
void CEntryStub::GenerateThrowTOS(MacroAssembler* masm) {
__ Throw(r0);
}
void CEntryStub::GenerateThrowUncatchable(MacroAssembler* masm,
UncatchableExceptionType type) {
__ ThrowUncatchable(type, r0);
}
void CEntryStub::GenerateCore(MacroAssembler* masm,
Label* throw_normal_exception,
Label* throw_termination_exception,
Label* throw_out_of_memory_exception,
bool do_gc,
bool always_allocate) {
// r0: result parameter for PerformGC, if any
// r4: number of arguments including receiver (C callee-saved)
// r5: pointer to builtin function (C callee-saved)
// r6: pointer to the first argument (C callee-saved)
Isolate* isolate = masm->isolate();
if (do_gc) {
// Passing r0.
__ PrepareCallCFunction(1, 0, r1);
__ CallCFunction(ExternalReference::perform_gc_function(isolate),
1, 0);
}
ExternalReference scope_depth =
ExternalReference::heap_always_allocate_scope_depth(isolate);
if (always_allocate) {
__ mov(r0, Operand(scope_depth));
__ ldr(r1, MemOperand(r0));
__ add(r1, r1, Operand(1));
__ str(r1, MemOperand(r0));
}
// Call C built-in.
// r0 = argc, r1 = argv
__ mov(r0, Operand(r4));
__ mov(r1, Operand(r6));
#if defined(V8_HOST_ARCH_ARM)
int frame_alignment = MacroAssembler::ActivationFrameAlignment();
int frame_alignment_mask = frame_alignment - 1;
if (FLAG_debug_code) {
if (frame_alignment > kPointerSize) {
Label alignment_as_expected;
ASSERT(IsPowerOf2(frame_alignment));
__ tst(sp, Operand(frame_alignment_mask));
__ b(eq, &alignment_as_expected);
// Don't use Check here, as it will call Runtime_Abort re-entering here.
__ stop("Unexpected alignment");
__ bind(&alignment_as_expected);
}
}
#endif
__ mov(r2, Operand(ExternalReference::isolate_address()));
// To let the GC traverse the return address of the exit frames, we need to
// know where the return address is. The CEntryStub is unmovable, so
// we can store the address on the stack to be able to find it again and
// we never have to restore it, because it will not change.
// Compute the return address in lr to return to after the jump below. Pc is
// already at '+ 8' from the current instruction but return is after three
// instructions so add another 4 to pc to get the return address.
masm->add(lr, pc, Operand(4));
__ str(lr, MemOperand(sp, 0));
masm->Jump(r5);
if (always_allocate) {
// It's okay to clobber r2 and r3 here. Don't mess with r0 and r1
// though (contain the result).
__ mov(r2, Operand(scope_depth));
__ ldr(r3, MemOperand(r2));
__ sub(r3, r3, Operand(1));
__ str(r3, MemOperand(r2));
}
// check for failure result
Label failure_returned;
STATIC_ASSERT(((kFailureTag + 1) & kFailureTagMask) == 0);
// Lower 2 bits of r2 are 0 iff r0 has failure tag.
__ add(r2, r0, Operand(1));
__ tst(r2, Operand(kFailureTagMask));
__ b(eq, &failure_returned);
// Exit C frame and return.
// r0:r1: result
// sp: stack pointer
// fp: frame pointer
// Callee-saved register r4 still holds argc.
__ LeaveExitFrame(save_doubles_, r4);
__ mov(pc, lr);
// check if we should retry or throw exception
Label retry;
__ bind(&failure_returned);
STATIC_ASSERT(Failure::RETRY_AFTER_GC == 0);
__ tst(r0, Operand(((1 << kFailureTypeTagSize) - 1) << kFailureTagSize));
__ b(eq, &retry);
// Special handling of out of memory exceptions.
Failure* out_of_memory = Failure::OutOfMemoryException();
__ cmp(r0, Operand(reinterpret_cast<int32_t>(out_of_memory)));
__ b(eq, throw_out_of_memory_exception);
// Retrieve the pending exception and clear the variable.
__ mov(ip, Operand(ExternalReference::the_hole_value_location(isolate)));
__ ldr(r3, MemOperand(ip));
__ mov(ip, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
isolate)));
__ ldr(r0, MemOperand(ip));
__ str(r3, MemOperand(ip));
// Special handling of termination exceptions which are uncatchable
// by javascript code.
__ cmp(r0, Operand(isolate->factory()->termination_exception()));
__ b(eq, throw_termination_exception);
// Handle normal exception.
__ jmp(throw_normal_exception);
__ bind(&retry); // pass last failure (r0) as parameter (r0) when retrying
}
void CEntryStub::Generate(MacroAssembler* masm) {
// Called from JavaScript; parameters are on stack as if calling JS function
// r0: number of arguments including receiver
// r1: pointer to builtin function
// fp: frame pointer (restored after C call)
// sp: stack pointer (restored as callee's sp after C call)
// cp: current context (C callee-saved)
// Result returned in r0 or r0+r1 by default.
// NOTE: Invocations of builtins may return failure objects
// instead of a proper result. The builtin entry handles
// this by performing a garbage collection and retrying the
// builtin once.
// Compute the argv pointer in a callee-saved register.
__ add(r6, sp, Operand(r0, LSL, kPointerSizeLog2));
__ sub(r6, r6, Operand(kPointerSize));
// Enter the exit frame that transitions from JavaScript to C++.
__ EnterExitFrame(save_doubles_);
// Setup argc and the builtin function in callee-saved registers.
__ mov(r4, Operand(r0));
__ mov(r5, Operand(r1));
// r4: number of arguments (C callee-saved)
// r5: pointer to builtin function (C callee-saved)
// r6: pointer to first argument (C callee-saved)
Label throw_normal_exception;
Label throw_termination_exception;
Label throw_out_of_memory_exception;
// Call into the runtime system.
GenerateCore(masm,
&throw_normal_exception,
&throw_termination_exception,
&throw_out_of_memory_exception,
false,
false);
// Do space-specific GC and retry runtime call.
GenerateCore(masm,
&throw_normal_exception,
&throw_termination_exception,
&throw_out_of_memory_exception,
true,
false);
// Do full GC and retry runtime call one final time.
Failure* failure = Failure::InternalError();
__ mov(r0, Operand(reinterpret_cast<int32_t>(failure)));
GenerateCore(masm,
&throw_normal_exception,
&throw_termination_exception,
&throw_out_of_memory_exception,
true,
true);
__ bind(&throw_out_of_memory_exception);
GenerateThrowUncatchable(masm, OUT_OF_MEMORY);
__ bind(&throw_termination_exception);
GenerateThrowUncatchable(masm, TERMINATION);
__ bind(&throw_normal_exception);
GenerateThrowTOS(masm);
}
void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) {
// r0: code entry
// r1: function
// r2: receiver
// r3: argc
// [sp+0]: argv
Label invoke, exit;
// Called from C, so do not pop argc and args on exit (preserve sp)
// No need to save register-passed args
// Save callee-saved registers (incl. cp and fp), sp, and lr
__ stm(db_w, sp, kCalleeSaved | lr.bit());
if (CpuFeatures::IsSupported(VFP3)) {
CpuFeatures::Scope scope(VFP3);
// Save callee-saved vfp registers.
__ vstm(db_w, sp, kFirstCalleeSavedDoubleReg, kLastCalleeSavedDoubleReg);
// Set up the reserved register for 0.0.
__ vmov(kDoubleRegZero, 0.0);
}
// Get address of argv, see stm above.
// r0: code entry
// r1: function
// r2: receiver
// r3: argc
// Setup argv in r4.
int offset_to_argv = (kNumCalleeSaved + 1) * kPointerSize;
if (CpuFeatures::IsSupported(VFP3)) {
offset_to_argv += kNumDoubleCalleeSaved * kDoubleSize;
}
__ ldr(r4, MemOperand(sp, offset_to_argv));
// Push a frame with special values setup to mark it as an entry frame.
// r0: code entry
// r1: function
// r2: receiver
// r3: argc
// r4: argv
Isolate* isolate = masm->isolate();
__ mov(r8, Operand(-1)); // Push a bad frame pointer to fail if it is used.
int marker = is_construct ? StackFrame::ENTRY_CONSTRUCT : StackFrame::ENTRY;
__ mov(r7, Operand(Smi::FromInt(marker)));
__ mov(r6, Operand(Smi::FromInt(marker)));
__ mov(r5,
Operand(ExternalReference(Isolate::kCEntryFPAddress, isolate)));
__ ldr(r5, MemOperand(r5));
__ Push(r8, r7, r6, r5);
// Setup frame pointer for the frame to be pushed.
__ add(fp, sp, Operand(-EntryFrameConstants::kCallerFPOffset));
// If this is the outermost JS call, set js_entry_sp value.
Label non_outermost_js;
ExternalReference js_entry_sp(Isolate::kJSEntrySPAddress, isolate);
__ mov(r5, Operand(ExternalReference(js_entry_sp)));
__ ldr(r6, MemOperand(r5));
__ cmp(r6, Operand::Zero());
__ b(ne, &non_outermost_js);
__ str(fp, MemOperand(r5));
__ mov(ip, Operand(Smi::FromInt(StackFrame::OUTERMOST_JSENTRY_FRAME)));
Label cont;
__ b(&cont);
__ bind(&non_outermost_js);
__ mov(ip, Operand(Smi::FromInt(StackFrame::INNER_JSENTRY_FRAME)));
__ bind(&cont);
__ push(ip);
// Call a faked try-block that does the invoke.
__ bl(&invoke);
// Caught exception: Store result (exception) in the pending
// exception field in the JSEnv and return a failure sentinel.
// Coming in here the fp will be invalid because the PushTryHandler below
// sets it to 0 to signal the existence of the JSEntry frame.
__ mov(ip, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
isolate)));
__ str(r0, MemOperand(ip));
__ mov(r0, Operand(reinterpret_cast<int32_t>(Failure::Exception())));
__ b(&exit);
// Invoke: Link this frame into the handler chain.
__ bind(&invoke);
// Must preserve r0-r4, r5-r7 are available.
__ PushTryHandler(IN_JS_ENTRY, JS_ENTRY_HANDLER);
// If an exception not caught by another handler occurs, this handler
// returns control to the code after the bl(&invoke) above, which
// restores all kCalleeSaved registers (including cp and fp) to their
// saved values before returning a failure to C.
// Clear any pending exceptions.
__ mov(ip, Operand(ExternalReference::the_hole_value_location(isolate)));
__ ldr(r5, MemOperand(ip));
__ mov(ip, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
isolate)));
__ str(r5, MemOperand(ip));
// Invoke the function by calling through JS entry trampoline builtin.
// Notice that we cannot store a reference to the trampoline code directly in
// this stub, because runtime stubs are not traversed when doing GC.
// Expected registers by Builtins::JSEntryTrampoline
// r0: code entry
// r1: function
// r2: receiver
// r3: argc
// r4: argv
if (is_construct) {
ExternalReference construct_entry(Builtins::kJSConstructEntryTrampoline,
isolate);
__ mov(ip, Operand(construct_entry));
} else {
ExternalReference entry(Builtins::kJSEntryTrampoline, isolate);
__ mov(ip, Operand(entry));
}
__ ldr(ip, MemOperand(ip)); // deref address
// Branch and link to JSEntryTrampoline. We don't use the double underscore
// macro for the add instruction because we don't want the coverage tool
// inserting instructions here after we read the pc.
__ mov(lr, Operand(pc));
masm->add(pc, ip, Operand(Code::kHeaderSize - kHeapObjectTag));
// Unlink this frame from the handler chain.
__ PopTryHandler();
__ bind(&exit); // r0 holds result
// Check if the current stack frame is marked as the outermost JS frame.
Label non_outermost_js_2;
__ pop(r5);
__ cmp(r5, Operand(Smi::FromInt(StackFrame::OUTERMOST_JSENTRY_FRAME)));
__ b(ne, &non_outermost_js_2);
__ mov(r6, Operand::Zero());
__ mov(r5, Operand(ExternalReference(js_entry_sp)));
__ str(r6, MemOperand(r5));
__ bind(&non_outermost_js_2);
// Restore the top frame descriptors from the stack.
__ pop(r3);
__ mov(ip,
Operand(ExternalReference(Isolate::kCEntryFPAddress, isolate)));
__ str(r3, MemOperand(ip));
// Reset the stack to the callee saved registers.
__ add(sp, sp, Operand(-EntryFrameConstants::kCallerFPOffset));
// Restore callee-saved registers and return.
#ifdef DEBUG
if (FLAG_debug_code) {
__ mov(lr, Operand(pc));
}
#endif
if (CpuFeatures::IsSupported(VFP3)) {
CpuFeatures::Scope scope(VFP3);
// Restore callee-saved vfp registers.
__ vldm(ia_w, sp, kFirstCalleeSavedDoubleReg, kLastCalleeSavedDoubleReg);
}
__ ldm(ia_w, sp, kCalleeSaved | pc.bit());
}
// Uses registers r0 to r4.
// Expected input (depending on whether args are in registers or on the stack):
// * object: r0 or at sp + 1 * kPointerSize.
// * function: r1 or at sp.
//
// An inlined call site may have been generated before calling this stub.
// In this case the offset to the inline site to patch is passed on the stack,
// in the safepoint slot for register r4.
// (See LCodeGen::DoInstanceOfKnownGlobal)
void InstanceofStub::Generate(MacroAssembler* masm) {
// Call site inlining and patching implies arguments in registers.
ASSERT(HasArgsInRegisters() || !HasCallSiteInlineCheck());
// ReturnTrueFalse is only implemented for inlined call sites.
ASSERT(!ReturnTrueFalseObject() || HasCallSiteInlineCheck());
// Fixed register usage throughout the stub:
const Register object = r0; // Object (lhs).
Register map = r3; // Map of the object.
const Register function = r1; // Function (rhs).
const Register prototype = r4; // Prototype of the function.
const Register inline_site = r9;
const Register scratch = r2;
const int32_t kDeltaToLoadBoolResult = 3 * kPointerSize;
Label slow, loop, is_instance, is_not_instance, not_js_object;
if (!HasArgsInRegisters()) {
__ ldr(object, MemOperand(sp, 1 * kPointerSize));
__ ldr(function, MemOperand(sp, 0));
}
// Check that the left hand is a JS object and load map.
__ JumpIfSmi(object, &not_js_object);
__ IsObjectJSObjectType(object, map, scratch, &not_js_object);
// If there is a call site cache don't look in the global cache, but do the
// real lookup and update the call site cache.
if (!HasCallSiteInlineCheck()) {
Label miss;
__ LoadRoot(ip, Heap::kInstanceofCacheFunctionRootIndex);
__ cmp(function, ip);
__ b(ne, &miss);
__ LoadRoot(ip, Heap::kInstanceofCacheMapRootIndex);
__ cmp(map, ip);
__ b(ne, &miss);
__ LoadRoot(r0, Heap::kInstanceofCacheAnswerRootIndex);
__ Ret(HasArgsInRegisters() ? 0 : 2);
__ bind(&miss);
}
// Get the prototype of the function.
__ TryGetFunctionPrototype(function, prototype, scratch, &slow);
// Check that the function prototype is a JS object.
__ JumpIfSmi(prototype, &slow);
__ IsObjectJSObjectType(prototype, scratch, scratch, &slow);
// Update the global instanceof or call site inlined cache with the current
// map and function. The cached answer will be set when it is known below.
if (!HasCallSiteInlineCheck()) {
__ StoreRoot(function, Heap::kInstanceofCacheFunctionRootIndex);
__ StoreRoot(map, Heap::kInstanceofCacheMapRootIndex);
} else {
ASSERT(HasArgsInRegisters());
// Patch the (relocated) inlined map check.
// The offset was stored in r4 safepoint slot.
// (See LCodeGen::DoDeferredLInstanceOfKnownGlobal)
__ LoadFromSafepointRegisterSlot(scratch, r4);
__ sub(inline_site, lr, scratch);
// Get the map location in scratch and patch it.
__ GetRelocatedValueLocation(inline_site, scratch);
__ str(map, MemOperand(scratch));
}
// Register mapping: r3 is object map and r4 is function prototype.
// Get prototype of object into r2.
__ ldr(scratch, FieldMemOperand(map, Map::kPrototypeOffset));
// We don't need map any more. Use it as a scratch register.
Register scratch2 = map;
map = no_reg;
// Loop through the prototype chain looking for the function prototype.
__ LoadRoot(scratch2, Heap::kNullValueRootIndex);
__ bind(&loop);
__ cmp(scratch, Operand(prototype));
__ b(eq, &is_instance);
__ cmp(scratch, scratch2);
__ b(eq, &is_not_instance);
__ ldr(scratch, FieldMemOperand(scratch, HeapObject::kMapOffset));
__ ldr(scratch, FieldMemOperand(scratch, Map::kPrototypeOffset));
__ jmp(&loop);
__ bind(&is_instance);
if (!HasCallSiteInlineCheck()) {
__ mov(r0, Operand(Smi::FromInt(0)));
__ StoreRoot(r0, Heap::kInstanceofCacheAnswerRootIndex);
} else {
// Patch the call site to return true.
__ LoadRoot(r0, Heap::kTrueValueRootIndex);
__ add(inline_site, inline_site, Operand(kDeltaToLoadBoolResult));
// Get the boolean result location in scratch and patch it.
__ GetRelocatedValueLocation(inline_site, scratch);
__ str(r0, MemOperand(scratch));
if (!ReturnTrueFalseObject()) {
__ mov(r0, Operand(Smi::FromInt(0)));
}
}
__ Ret(HasArgsInRegisters() ? 0 : 2);
__ bind(&is_not_instance);
if (!HasCallSiteInlineCheck()) {
__ mov(r0, Operand(Smi::FromInt(1)));
__ StoreRoot(r0, Heap::kInstanceofCacheAnswerRootIndex);
} else {
// Patch the call site to return false.
__ LoadRoot(r0, Heap::kFalseValueRootIndex);
__ add(inline_site, inline_site, Operand(kDeltaToLoadBoolResult));
// Get the boolean result location in scratch and patch it.
__ GetRelocatedValueLocation(inline_site, scratch);
__ str(r0, MemOperand(scratch));
if (!ReturnTrueFalseObject()) {
__ mov(r0, Operand(Smi::FromInt(1)));
}
}
__ Ret(HasArgsInRegisters() ? 0 : 2);
Label object_not_null, object_not_null_or_smi;
__ bind(&not_js_object);
// Before null, smi and string value checks, check that the rhs is a function
// as for a non-function rhs an exception needs to be thrown.
__ JumpIfSmi(function, &slow);
__ CompareObjectType(function, scratch2, scratch, JS_FUNCTION_TYPE);
__ b(ne, &slow);
// Null is not instance of anything.
__ cmp(scratch, Operand(masm->isolate()->factory()->null_value()));
__ b(ne, &object_not_null);
__ mov(r0, Operand(Smi::FromInt(1)));
__ Ret(HasArgsInRegisters() ? 0 : 2);
__ bind(&object_not_null);
// Smi values are not instances of anything.
__ JumpIfNotSmi(object, &object_not_null_or_smi);
__ mov(r0, Operand(Smi::FromInt(1)));
__ Ret(HasArgsInRegisters() ? 0 : 2);
__ bind(&object_not_null_or_smi);
// String values are not instances of anything.
__ IsObjectJSStringType(object, scratch, &slow);
__ mov(r0, Operand(Smi::FromInt(1)));
__ Ret(HasArgsInRegisters() ? 0 : 2);
// Slow-case. Tail call builtin.
__ bind(&slow);
if (!ReturnTrueFalseObject()) {
if (HasArgsInRegisters()) {
__ Push(r0, r1);
}
__ InvokeBuiltin(Builtins::INSTANCE_OF, JUMP_FUNCTION);
} else {
__ EnterInternalFrame();
__ Push(r0, r1);
__ InvokeBuiltin(Builtins::INSTANCE_OF, CALL_FUNCTION);
__ LeaveInternalFrame();
__ cmp(r0, Operand::Zero());
__ LoadRoot(r0, Heap::kTrueValueRootIndex, eq);
__ LoadRoot(r0, Heap::kFalseValueRootIndex, ne);
__ Ret(HasArgsInRegisters() ? 0 : 2);
}
}
Register InstanceofStub::left() { return r0; }
Register InstanceofStub::right() { return r1; }
void ArgumentsAccessStub::GenerateReadElement(MacroAssembler* masm) {
// The displacement is the offset of the last parameter (if any)
// relative to the frame pointer.
static const int kDisplacement =
StandardFrameConstants::kCallerSPOffset - kPointerSize;
// Check that the key is a smi.
Label slow;
__ JumpIfNotSmi(r1, &slow);
// Check if the calling frame is an arguments adaptor frame.
Label adaptor;
__ ldr(r2, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
__ ldr(r3, MemOperand(r2, StandardFrameConstants::kContextOffset));
__ cmp(r3, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
__ b(eq, &adaptor);
// Check index against formal parameters count limit passed in
// through register r0. Use unsigned comparison to get negative
// check for free.
__ cmp(r1, r0);
__ b(hs, &slow);
// Read the argument from the stack and return it.
__ sub(r3, r0, r1);
__ add(r3, fp, Operand(r3, LSL, kPointerSizeLog2 - kSmiTagSize));
__ ldr(r0, MemOperand(r3, kDisplacement));
__ Jump(lr);
// Arguments adaptor case: Check index against actual arguments
// limit found in the arguments adaptor frame. Use unsigned
// comparison to get negative check for free.
__ bind(&adaptor);
__ ldr(r0, MemOperand(r2, ArgumentsAdaptorFrameConstants::kLengthOffset));
__ cmp(r1, r0);
__ b(cs, &slow);
// Read the argument from the adaptor frame and return it.
__ sub(r3, r0, r1);
__ add(r3, r2, Operand(r3, LSL, kPointerSizeLog2 - kSmiTagSize));
__ ldr(r0, MemOperand(r3, kDisplacement));
__ Jump(lr);
// Slow-case: Handle non-smi or out-of-bounds access to arguments
// by calling the runtime system.
__ bind(&slow);
__ push(r1);
__ TailCallRuntime(Runtime::kGetArgumentsProperty, 1, 1);
}
void ArgumentsAccessStub::GenerateNewNonStrictSlow(MacroAssembler* masm) {
// sp[0] : number of parameters
// sp[4] : receiver displacement
// sp[8] : function
// Check if the calling frame is an arguments adaptor frame.
Label runtime;
__ ldr(r3, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
__ ldr(r2, MemOperand(r3, StandardFrameConstants::kContextOffset));
__ cmp(r2, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
__ b(ne, &runtime);
// Patch the arguments.length and the parameters pointer in the current frame.
__ ldr(r2, MemOperand(r3, ArgumentsAdaptorFrameConstants::kLengthOffset));
__ str(r2, MemOperand(sp, 0 * kPointerSize));
__ add(r3, r3, Operand(r2, LSL, 1));
__ add(r3, r3, Operand(StandardFrameConstants::kCallerSPOffset));
__ str(r3, MemOperand(sp, 1 * kPointerSize));
__ bind(&runtime);
__ TailCallRuntime(Runtime::kNewArgumentsFast, 3, 1);
}
void ArgumentsAccessStub::GenerateNewNonStrictFast(MacroAssembler* masm) {
// Stack layout:
// sp[0] : number of parameters (tagged)
// sp[4] : address of receiver argument
// sp[8] : function
// Registers used over whole function:
// r6 : allocated object (tagged)
// r9 : mapped parameter count (tagged)
__ ldr(r1, MemOperand(sp, 0 * kPointerSize));
// r1 = parameter count (tagged)
// Check if the calling frame is an arguments adaptor frame.
Label runtime;
Label adaptor_frame, try_allocate;
__ ldr(r3, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
__ ldr(r2, MemOperand(r3, StandardFrameConstants::kContextOffset));
__ cmp(r2, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
__ b(eq, &adaptor_frame);
// No adaptor, parameter count = argument count.
__ mov(r2, r1);
__ b(&try_allocate);
// We have an adaptor frame. Patch the parameters pointer.
__ bind(&adaptor_frame);
__ ldr(r2, MemOperand(r3, ArgumentsAdaptorFrameConstants::kLengthOffset));
__ add(r3, r3, Operand(r2, LSL, 1));
__ add(r3, r3, Operand(StandardFrameConstants::kCallerSPOffset));
__ str(r3, MemOperand(sp, 1 * kPointerSize));
// r1 = parameter count (tagged)
// r2 = argument count (tagged)
// Compute the mapped parameter count = min(r1, r2) in r1.
__ cmp(r1, Operand(r2));
__ mov(r1, Operand(r2), LeaveCC, gt);
__ bind(&try_allocate);
// Compute the sizes of backing store, parameter map, and arguments object.
// 1. Parameter map, has 2 extra words containing context and backing store.
const int kParameterMapHeaderSize =
FixedArray::kHeaderSize + 2 * kPointerSize;
// If there are no mapped parameters, we do not need the parameter_map.
__ cmp(r1, Operand(Smi::FromInt(0)));
__ mov(r9, Operand::Zero(), LeaveCC, eq);
__ mov(r9, Operand(r1, LSL, 1), LeaveCC, ne);
__ add(r9, r9, Operand(kParameterMapHeaderSize), LeaveCC, ne);
// 2. Backing store.
__ add(r9, r9, Operand(r2, LSL, 1));
__ add(r9, r9, Operand(FixedArray::kHeaderSize));
// 3. Arguments object.
__ add(r9, r9, Operand(Heap::kArgumentsObjectSize));
// Do the allocation of all three objects in one go.
__ AllocateInNewSpace(r9, r0, r3, r4, &runtime, TAG_OBJECT);
// r0 = address of new object(s) (tagged)
// r2 = argument count (tagged)
// Get the arguments boilerplate from the current (global) context into r4.
const int kNormalOffset =
Context::SlotOffset(Context::ARGUMENTS_BOILERPLATE_INDEX);
const int kAliasedOffset =
Context::SlotOffset(Context::ALIASED_ARGUMENTS_BOILERPLATE_INDEX);
__ ldr(r4, MemOperand(r8, Context::SlotOffset(Context::GLOBAL_INDEX)));
__ ldr(r4, FieldMemOperand(r4, GlobalObject::kGlobalContextOffset));
__ cmp(r1, Operand::Zero());
__ ldr(r4, MemOperand(r4, kNormalOffset), eq);
__ ldr(r4, MemOperand(r4, kAliasedOffset), ne);
// r0 = address of new object (tagged)
// r1 = mapped parameter count (tagged)
// r2 = argument count (tagged)
// r4 = address of boilerplate object (tagged)
// Copy the JS object part.
for (int i = 0; i < JSObject::kHeaderSize; i += kPointerSize) {
__ ldr(r3, FieldMemOperand(r4, i));
__ str(r3, FieldMemOperand(r0, i));
}
// Setup the callee in-object property.
STATIC_ASSERT(Heap::kArgumentsCalleeIndex == 1);
__ ldr(r3, MemOperand(sp, 2 * kPointerSize));
const int kCalleeOffset = JSObject::kHeaderSize +
Heap::kArgumentsCalleeIndex * kPointerSize;
__ str(r3, FieldMemOperand(r0, kCalleeOffset));
// Use the length (smi tagged) and set that as an in-object property too.
STATIC_ASSERT(Heap::kArgumentsLengthIndex == 0);
const int kLengthOffset = JSObject::kHeaderSize +
Heap::kArgumentsLengthIndex * kPointerSize;
__ str(r2, FieldMemOperand(r0, kLengthOffset));
// Setup the elements pointer in the allocated arguments object.
// If we allocated a parameter map, r4 will point there, otherwise
// it will point to the backing store.
__ add(r4, r0, Operand(Heap::kArgumentsObjectSize));
__ str(r4, FieldMemOperand(r0, JSObject::kElementsOffset));
// r0 = address of new object (tagged)
// r1 = mapped parameter count (tagged)
// r2 = argument count (tagged)
// r4 = address of parameter map or backing store (tagged)
// Initialize parameter map. If there are no mapped arguments, we're done.
Label skip_parameter_map;
__ cmp(r1, Operand(Smi::FromInt(0)));
// Move backing store address to r3, because it is
// expected there when filling in the unmapped arguments.
__ mov(r3, r4, LeaveCC, eq);
__ b(eq, &skip_parameter_map);
__ LoadRoot(r6, Heap::kNonStrictArgumentsElementsMapRootIndex);
__ str(r6, FieldMemOperand(r4, FixedArray::kMapOffset));
__ add(r6, r1, Operand(Smi::FromInt(2)));
__ str(r6, FieldMemOperand(r4, FixedArray::kLengthOffset));
__ str(r8, FieldMemOperand(r4, FixedArray::kHeaderSize + 0 * kPointerSize));
__ add(r6, r4, Operand(r1, LSL, 1));
__ add(r6, r6, Operand(kParameterMapHeaderSize));
__ str(r6, FieldMemOperand(r4, FixedArray::kHeaderSize + 1 * kPointerSize));
// Copy the parameter slots and the holes in the arguments.
// We need to fill in mapped_parameter_count slots. They index the context,
// where parameters are stored in reverse order, at
// MIN_CONTEXT_SLOTS .. MIN_CONTEXT_SLOTS+parameter_count-1
// The mapped parameter thus need to get indices
// MIN_CONTEXT_SLOTS+parameter_count-1 ..
// MIN_CONTEXT_SLOTS+parameter_count-mapped_parameter_count
// We loop from right to left.
Label parameters_loop, parameters_test;
__ mov(r6, r1);
__ ldr(r9, MemOperand(sp, 0 * kPointerSize));
__ add(r9, r9, Operand(Smi::FromInt(Context::MIN_CONTEXT_SLOTS)));
__ sub(r9, r9, Operand(r1));
__ LoadRoot(r7, Heap::kTheHoleValueRootIndex);
__ add(r3, r4, Operand(r6, LSL, 1));
__ add(r3, r3, Operand(kParameterMapHeaderSize));
// r6 = loop variable (tagged)
// r1 = mapping index (tagged)
// r3 = address of backing store (tagged)
// r4 = address of parameter map (tagged)
// r5 = temporary scratch (a.o., for address calculation)
// r7 = the hole value
__ jmp(&parameters_test);
__ bind(&parameters_loop);
__ sub(r6, r6, Operand(Smi::FromInt(1)));
__ mov(r5, Operand(r6, LSL, 1));
__ add(r5, r5, Operand(kParameterMapHeaderSize - kHeapObjectTag));
__ str(r9, MemOperand(r4, r5));
__ sub(r5, r5, Operand(kParameterMapHeaderSize - FixedArray::kHeaderSize));
__ str(r7, MemOperand(r3, r5));
__ add(r9, r9, Operand(Smi::FromInt(1)));
__ bind(&parameters_test);
__ cmp(r6, Operand(Smi::FromInt(0)));
__ b(ne, &parameters_loop);
__ bind(&skip_parameter_map);
// r2 = argument count (tagged)
// r3 = address of backing store (tagged)
// r5 = scratch
// Copy arguments header and remaining slots (if there are any).
__ LoadRoot(r5, Heap::kFixedArrayMapRootIndex);
__ str(r5, FieldMemOperand(r3, FixedArray::kMapOffset));
__ str(r2, FieldMemOperand(r3, FixedArray::kLengthOffset));
Label arguments_loop, arguments_test;
__ mov(r9, r1);
__ ldr(r4, MemOperand(sp, 1 * kPointerSize));
__ sub(r4, r4, Operand(r9, LSL, 1));
__ jmp(&arguments_test);
__ bind(&arguments_loop);
__ sub(r4, r4, Operand(kPointerSize));
__ ldr(r6, MemOperand(r4, 0));
__ add(r5, r3, Operand(r9, LSL, 1));
__ str(r6, FieldMemOperand(r5, FixedArray::kHeaderSize));
__ add(r9, r9, Operand(Smi::FromInt(1)));
__ bind(&arguments_test);
__ cmp(r9, Operand(r2));
__ b(lt, &arguments_loop);
// Return and remove the on-stack parameters.
__ add(sp, sp, Operand(3 * kPointerSize));
__ Ret();
// Do the runtime call to allocate the arguments object.
// r2 = argument count (taggged)
__ bind(&runtime);
__ str(r2, MemOperand(sp, 0 * kPointerSize)); // Patch argument count.
__ TailCallRuntime(Runtime::kNewArgumentsFast, 3, 1);
}
void ArgumentsAccessStub::GenerateNewStrict(MacroAssembler* masm) {
// sp[0] : number of parameters
// sp[4] : receiver displacement
// sp[8] : function
// Check if the calling frame is an arguments adaptor frame.
Label adaptor_frame, try_allocate, runtime;
__ ldr(r2, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
__ ldr(r3, MemOperand(r2, StandardFrameConstants::kContextOffset));
__ cmp(r3, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
__ b(eq, &adaptor_frame);
// Get the length from the frame.
__ ldr(r1, MemOperand(sp, 0));
__ b(&try_allocate);
// Patch the arguments.length and the parameters pointer.
__ bind(&adaptor_frame);
__ ldr(r1, MemOperand(r2, ArgumentsAdaptorFrameConstants::kLengthOffset));
__ str(r1, MemOperand(sp, 0));
__ add(r3, r2, Operand(r1, LSL, kPointerSizeLog2 - kSmiTagSize));
__ add(r3, r3, Operand(StandardFrameConstants::kCallerSPOffset));
__ str(r3, MemOperand(sp, 1 * kPointerSize));
// Try the new space allocation. Start out with computing the size
// of the arguments object and the elements array in words.
Label add_arguments_object;
__ bind(&try_allocate);
__ cmp(r1, Operand(0, RelocInfo::NONE));
__ b(eq, &add_arguments_object);
__ mov(r1, Operand(r1, LSR, kSmiTagSize));
__ add(r1, r1, Operand(FixedArray::kHeaderSize / kPointerSize));
__ bind(&add_arguments_object);
__ add(r1, r1, Operand(Heap::kArgumentsObjectSizeStrict / kPointerSize));
// Do the allocation of both objects in one go.
__ AllocateInNewSpace(r1,
r0,
r2,
r3,
&runtime,
static_cast<AllocationFlags>(TAG_OBJECT |
SIZE_IN_WORDS));
// Get the arguments boilerplate from the current (global) context.
__ ldr(r4, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
__ ldr(r4, FieldMemOperand(r4, GlobalObject::kGlobalContextOffset));
__ ldr(r4, MemOperand(r4, Context::SlotOffset(
Context::STRICT_MODE_ARGUMENTS_BOILERPLATE_INDEX)));
// Copy the JS object part.
__ CopyFields(r0, r4, r3.bit(), JSObject::kHeaderSize / kPointerSize);
// Get the length (smi tagged) and set that as an in-object property too.
STATIC_ASSERT(Heap::kArgumentsLengthIndex == 0);
__ ldr(r1, MemOperand(sp, 0 * kPointerSize));
__ str(r1, FieldMemOperand(r0, JSObject::kHeaderSize +
Heap::kArgumentsLengthIndex * kPointerSize));
// If there are no actual arguments, we're done.
Label done;
__ cmp(r1, Operand(0, RelocInfo::NONE));
__ b(eq, &done);
// Get the parameters pointer from the stack.
__ ldr(r2, MemOperand(sp, 1 * kPointerSize));
// Setup the elements pointer in the allocated arguments object and
// initialize the header in the elements fixed array.
__ add(r4, r0, Operand(Heap::kArgumentsObjectSizeStrict));
__ str(r4, FieldMemOperand(r0, JSObject::kElementsOffset));
__ LoadRoot(r3, Heap::kFixedArrayMapRootIndex);
__ str(r3, FieldMemOperand(r4, FixedArray::kMapOffset));
__ str(r1, FieldMemOperand(r4, FixedArray::kLengthOffset));
// Untag the length for the loop.
__ mov(r1, Operand(r1, LSR, kSmiTagSize));
// Copy the fixed array slots.
Label loop;
// Setup r4 to point to the first array slot.
__ add(r4, r4, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
__ bind(&loop);
// Pre-decrement r2 with kPointerSize on each iteration.
// Pre-decrement in order to skip receiver.
__ ldr(r3, MemOperand(r2, kPointerSize, NegPreIndex));
// Post-increment r4 with kPointerSize on each iteration.
__ str(r3, MemOperand(r4, kPointerSize, PostIndex));
__ sub(r1, r1, Operand(1));
__ cmp(r1, Operand(0, RelocInfo::NONE));
__ b(ne, &loop);
// Return and remove the on-stack parameters.
__ bind(&done);
__ add(sp, sp, Operand(3 * kPointerSize));
__ Ret();
// Do the runtime call to allocate the arguments object.
__ bind(&runtime);
__ TailCallRuntime(Runtime::kNewStrictArgumentsFast, 3, 1);
}
void RegExpExecStub::Generate(MacroAssembler* masm) {
// Just jump directly to runtime if native RegExp is not selected at compile
// time or if regexp entry in generated code is turned off runtime switch or
// at compilation.
#ifdef V8_INTERPRETED_REGEXP
__ TailCallRuntime(Runtime::kRegExpExec, 4, 1);
#else // V8_INTERPRETED_REGEXP
if (!FLAG_regexp_entry_native) {
__ TailCallRuntime(Runtime::kRegExpExec, 4, 1);
return;
}
// Stack frame on entry.
// sp[0]: last_match_info (expected JSArray)
// sp[4]: previous index
// sp[8]: subject string
// sp[12]: JSRegExp object
static const int kLastMatchInfoOffset = 0 * kPointerSize;
static const int kPreviousIndexOffset = 1 * kPointerSize;
static const int kSubjectOffset = 2 * kPointerSize;
static const int kJSRegExpOffset = 3 * kPointerSize;
Label runtime, invoke_regexp;
// Allocation of registers for this function. These are in callee save
// registers and will be preserved by the call to the native RegExp code, as
// this code is called using the normal C calling convention. When calling
// directly from generated code the native RegExp code will not do a GC and
// therefore the content of these registers are safe to use after the call.
Register subject = r4;
Register regexp_data = r5;
Register last_match_info_elements = r6;
// Ensure that a RegExp stack is allocated.
Isolate* isolate = masm->isolate();
ExternalReference address_of_regexp_stack_memory_address =
ExternalReference::address_of_regexp_stack_memory_address(isolate);
ExternalReference address_of_regexp_stack_memory_size =
ExternalReference::address_of_regexp_stack_memory_size(isolate);
__ mov(r0, Operand(address_of_regexp_stack_memory_size));
__ ldr(r0, MemOperand(r0, 0));
__ tst(r0, Operand(r0));
__ b(eq, &runtime);
// Check that the first argument is a JSRegExp object.
__ ldr(r0, MemOperand(sp, kJSRegExpOffset));
STATIC_ASSERT(kSmiTag == 0);
__ JumpIfSmi(r0, &runtime);
__ CompareObjectType(r0, r1, r1, JS_REGEXP_TYPE);
__ b(ne, &runtime);
// Check that the RegExp has been compiled (data contains a fixed array).
__ ldr(regexp_data, FieldMemOperand(r0, JSRegExp::kDataOffset));
if (FLAG_debug_code) {
__ tst(regexp_data, Operand(kSmiTagMask));
__ Check(ne, "Unexpected type for RegExp data, FixedArray expected");
__ CompareObjectType(regexp_data, r0, r0, FIXED_ARRAY_TYPE);
__ Check(eq, "Unexpected type for RegExp data, FixedArray expected");
}
// regexp_data: RegExp data (FixedArray)
// Check the type of the RegExp. Only continue if type is JSRegExp::IRREGEXP.
__ ldr(r0, FieldMemOperand(regexp_data, JSRegExp::kDataTagOffset));
__ cmp(r0, Operand(Smi::FromInt(JSRegExp::IRREGEXP)));
__ b(ne, &runtime);
// regexp_data: RegExp data (FixedArray)
// Check that the number of captures fit in the static offsets vector buffer.
__ ldr(r2,
FieldMemOperand(regexp_data, JSRegExp::kIrregexpCaptureCountOffset));
// Calculate number of capture registers (number_of_captures + 1) * 2. This
// uses the asumption that smis are 2 * their untagged value.
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 1);
__ add(r2, r2, Operand(2)); // r2 was a smi.
// Check that the static offsets vector buffer is large enough.
__ cmp(r2, Operand(OffsetsVector::kStaticOffsetsVectorSize));
__ b(hi, &runtime);
// r2: Number of capture registers
// regexp_data: RegExp data (FixedArray)
// Check that the second argument is a string.
__ ldr(subject, MemOperand(sp, kSubjectOffset));
__ JumpIfSmi(subject, &runtime);
Condition is_string = masm->IsObjectStringType(subject, r0);
__ b(NegateCondition(is_string), &runtime);
// Get the length of the string to r3.
__ ldr(r3, FieldMemOperand(subject, String::kLengthOffset));
// r2: Number of capture registers
// r3: Length of subject string as a smi
// subject: Subject string
// regexp_data: RegExp data (FixedArray)
// Check that the third argument is a positive smi less than the subject
// string length. A negative value will be greater (unsigned comparison).
__ ldr(r0, MemOperand(sp, kPreviousIndexOffset));
__ JumpIfNotSmi(r0, &runtime);
__ cmp(r3, Operand(r0));
__ b(ls, &runtime);
// r2: Number of capture registers
// subject: Subject string
// regexp_data: RegExp data (FixedArray)
// Check that the fourth object is a JSArray object.
__ ldr(r0, MemOperand(sp, kLastMatchInfoOffset));
__ JumpIfSmi(r0, &runtime);
__ CompareObjectType(r0, r1, r1, JS_ARRAY_TYPE);
__ b(ne, &runtime);
// Check that the JSArray is in fast case.
__ ldr(last_match_info_elements,
FieldMemOperand(r0, JSArray::kElementsOffset));
__ ldr(r0, FieldMemOperand(last_match_info_elements, HeapObject::kMapOffset));
__ LoadRoot(ip, Heap::kFixedArrayMapRootIndex);
__ cmp(r0, ip);
__ b(ne, &runtime);
// Check that the last match info has space for the capture registers and the
// additional information.
__ ldr(r0,
FieldMemOperand(last_match_info_elements, FixedArray::kLengthOffset));
__ add(r2, r2, Operand(RegExpImpl::kLastMatchOverhead));
__ cmp(r2, Operand(r0, ASR, kSmiTagSize));
__ b(gt, &runtime);
// Reset offset for possibly sliced string.
__ mov(r9, Operand(0));
// subject: Subject string
// regexp_data: RegExp data (FixedArray)
// Check the representation and encoding of the subject string.
Label seq_string;
__ ldr(r0, FieldMemOperand(subject, HeapObject::kMapOffset));
__ ldrb(r0, FieldMemOperand(r0, Map::kInstanceTypeOffset));
// First check for flat string.
__ and_(r1, r0, Operand(kIsNotStringMask | kStringRepresentationMask), SetCC);
STATIC_ASSERT((kStringTag | kSeqStringTag) == 0);
__ b(eq, &seq_string);
// subject: Subject string
// regexp_data: RegExp data (FixedArray)
// Check for flat cons string or sliced string.
// A flat cons string is a cons string where the second part is the empty
// string. In that case the subject string is just the first part of the cons
// string. Also in this case the first part of the cons string is known to be
// a sequential string or an external string.
// In the case of a sliced string its offset has to be taken into account.
Label cons_string, check_encoding;
STATIC_ASSERT(kConsStringTag < kExternalStringTag);
STATIC_ASSERT(kSlicedStringTag > kExternalStringTag);
__ cmp(r1, Operand(kExternalStringTag));
__ b(lt, &cons_string);
__ b(eq, &runtime);
// String is sliced.
__ ldr(r9, FieldMemOperand(subject, SlicedString::kOffsetOffset));
__ mov(r9, Operand(r9, ASR, kSmiTagSize));
__ ldr(subject, FieldMemOperand(subject, SlicedString::kParentOffset));
// r9: offset of sliced string, smi-tagged.
__ jmp(&check_encoding);
// String is a cons string, check whether it is flat.
__ bind(&cons_string);
__ ldr(r0, FieldMemOperand(subject, ConsString::kSecondOffset));
__ LoadRoot(r1, Heap::kEmptyStringRootIndex);
__ cmp(r0, r1);
__ b(ne, &runtime);
__ ldr(subject, FieldMemOperand(subject, ConsString::kFirstOffset));
// Is first part of cons or parent of slice a flat string?
__ bind(&check_encoding);
__ ldr(r0, FieldMemOperand(subject, HeapObject::kMapOffset));
__ ldrb(r0, FieldMemOperand(r0, Map::kInstanceTypeOffset));
STATIC_ASSERT(kSeqStringTag == 0);
__ tst(r0, Operand(kStringRepresentationMask));
__ b(ne, &runtime);
__ bind(&seq_string);
// subject: Subject string
// regexp_data: RegExp data (FixedArray)
// r0: Instance type of subject string
STATIC_ASSERT(4 == kAsciiStringTag);
STATIC_ASSERT(kTwoByteStringTag == 0);
// Find the code object based on the assumptions above.
__ and_(r0, r0, Operand(kStringEncodingMask));
__ mov(r3, Operand(r0, ASR, 2), SetCC);
__ ldr(r7, FieldMemOperand(regexp_data, JSRegExp::kDataAsciiCodeOffset), ne);
__ ldr(r7, FieldMemOperand(regexp_data, JSRegExp::kDataUC16CodeOffset), eq);
// Check that the irregexp code has been generated for the actual string
// encoding. If it has, the field contains a code object otherwise it contains
// a smi (code flushing support).
__ JumpIfSmi(r7, &runtime);
// r3: encoding of subject string (1 if ASCII, 0 if two_byte);
// r7: code
// subject: Subject string
// regexp_data: RegExp data (FixedArray)
// Load used arguments before starting to push arguments for call to native
// RegExp code to avoid handling changing stack height.
__ ldr(r1, MemOperand(sp, kPreviousIndexOffset));
__ mov(r1, Operand(r1, ASR, kSmiTagSize));
// r1: previous index
// r3: encoding of subject string (1 if ASCII, 0 if two_byte);
// r7: code
// subject: Subject string
// regexp_data: RegExp data (FixedArray)
// All checks done. Now push arguments for native regexp code.
__ IncrementCounter(isolate->counters()->regexp_entry_native(), 1, r0, r2);
// Isolates: note we add an additional parameter here (isolate pointer).
static const int kRegExpExecuteArguments = 8;
static const int kParameterRegisters = 4;
__ EnterExitFrame(false, kRegExpExecuteArguments - kParameterRegisters);
// Stack pointer now points to cell where return address is to be written.
// Arguments are before that on the stack or in registers.
// Argument 8 (sp[16]): Pass current isolate address.
__ mov(r0, Operand(ExternalReference::isolate_address()));
__ str(r0, MemOperand(sp, 4 * kPointerSize));
// Argument 7 (sp[12]): Indicate that this is a direct call from JavaScript.
__ mov(r0, Operand(1));
__ str(r0, MemOperand(sp, 3 * kPointerSize));
// Argument 6 (sp[8]): Start (high end) of backtracking stack memory area.
__ mov(r0, Operand(address_of_regexp_stack_memory_address));
__ ldr(r0, MemOperand(r0, 0));
__ mov(r2, Operand(address_of_regexp_stack_memory_size));
__ ldr(r2, MemOperand(r2, 0));
__ add(r0, r0, Operand(r2));
__ str(r0, MemOperand(sp, 2 * kPointerSize));
// Argument 5 (sp[4]): static offsets vector buffer.
__ mov(r0,
Operand(ExternalReference::address_of_static_offsets_vector(isolate)));
__ str(r0, MemOperand(sp, 1 * kPointerSize));
// For arguments 4 and 3 get string length, calculate start of string data and
// calculate the shift of the index (0 for ASCII and 1 for two byte).
STATIC_ASSERT(SeqAsciiString::kHeaderSize == SeqTwoByteString::kHeaderSize);
__ add(r8, subject, Operand(SeqAsciiString::kHeaderSize - kHeapObjectTag));
__ eor(r3, r3, Operand(1));
// Load the length from the original subject string from the previous stack
// frame. Therefore we have to use fp, which points exactly to two pointer
// sizes below the previous sp. (Because creating a new stack frame pushes
// the previous fp onto the stack and moves up sp by 2 * kPointerSize.)
__ ldr(subject, MemOperand(fp, kSubjectOffset + 2 * kPointerSize));
// If slice offset is not 0, load the length from the original sliced string.
// Argument 4, r3: End of string data
// Argument 3, r2: Start of string data
// Prepare start and end index of the input.
__ add(r9, r8, Operand(r9, LSL, r3));
__ add(r2, r9, Operand(r1, LSL, r3));
__ ldr(r8, FieldMemOperand(subject, String::kLengthOffset));
__ mov(r8, Operand(r8, ASR, kSmiTagSize));
__ add(r3, r9, Operand(r8, LSL, r3));
// Argument 2 (r1): Previous index.
// Already there
// Argument 1 (r0): Subject string.
__ mov(r0, subject);
// Locate the code entry and call it.
__ add(r7, r7, Operand(Code::kHeaderSize - kHeapObjectTag));
DirectCEntryStub stub;
stub.GenerateCall(masm, r7);
__ LeaveExitFrame(false, no_reg);
// r0: result
// subject: subject string (callee saved)
// regexp_data: RegExp data (callee saved)
// last_match_info_elements: Last match info elements (callee saved)
// Check the result.
Label success;
__ cmp(r0, Operand(NativeRegExpMacroAssembler::SUCCESS));
__ b(eq, &success);
Label failure;
__ cmp(r0, Operand(NativeRegExpMacroAssembler::FAILURE));
__ b(eq, &failure);
__ cmp(r0, Operand(NativeRegExpMacroAssembler::EXCEPTION));
// If not exception it can only be retry. Handle that in the runtime system.
__ b(ne, &runtime);
// Result must now be exception. If there is no pending exception already a
// stack overflow (on the backtrack stack) was detected in RegExp code but
// haven't created the exception yet. Handle that in the runtime system.
// TODO(592): Rerunning the RegExp to get the stack overflow exception.
__ mov(r1, Operand(ExternalReference::the_hole_value_location(isolate)));
__ ldr(r1, MemOperand(r1, 0));
__ mov(r2, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
isolate)));
__ ldr(r0, MemOperand(r2, 0));
__ cmp(r0, r1);
__ b(eq, &runtime);
__ str(r1, MemOperand(r2, 0)); // Clear pending exception.
// Check if the exception is a termination. If so, throw as uncatchable.
__ CompareRoot(r0, Heap::kTerminationExceptionRootIndex);
Label termination_exception;
__ b(eq, &termination_exception);
__ Throw(r0); // Expects thrown value in r0.
__ bind(&termination_exception);
__ ThrowUncatchable(TERMINATION, r0); // Expects thrown value in r0.
__ bind(&failure);
// For failure and exception return null.
__ mov(r0, Operand(masm->isolate()->factory()->null_value()));
__ add(sp, sp, Operand(4 * kPointerSize));
__ Ret();
// Process the result from the native regexp code.
__ bind(&success);
__ ldr(r1,
FieldMemOperand(regexp_data, JSRegExp::kIrregexpCaptureCountOffset));
// Calculate number of capture registers (number_of_captures + 1) * 2.
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 1);
__ add(r1, r1, Operand(2)); // r1 was a smi.
// r1: number of capture registers
// r4: subject string
// Store the capture count.
__ mov(r2, Operand(r1, LSL, kSmiTagSize + kSmiShiftSize)); // To smi.
__ str(r2, FieldMemOperand(last_match_info_elements,
RegExpImpl::kLastCaptureCountOffset));
// Store last subject and last input.
__ mov(r3, last_match_info_elements); // Moved up to reduce latency.
__ str(subject,
FieldMemOperand(last_match_info_elements,
RegExpImpl::kLastSubjectOffset));
__ RecordWrite(r3, Operand(RegExpImpl::kLastSubjectOffset), r2, r7);
__ str(subject,
FieldMemOperand(last_match_info_elements,
RegExpImpl::kLastInputOffset));
__ mov(r3, last_match_info_elements);
__ RecordWrite(r3, Operand(RegExpImpl::kLastInputOffset), r2, r7);
// Get the static offsets vector filled by the native regexp code.
ExternalReference address_of_static_offsets_vector =
ExternalReference::address_of_static_offsets_vector(isolate);
__ mov(r2, Operand(address_of_static_offsets_vector));
// r1: number of capture registers
// r2: offsets vector
Label next_capture, done;
// Capture register counter starts from number of capture registers and
// counts down until wraping after zero.
__ add(r0,
last_match_info_elements,
Operand(RegExpImpl::kFirstCaptureOffset - kHeapObjectTag));
__ bind(&next_capture);
__ sub(r1, r1, Operand(1), SetCC);
__ b(mi, &done);
// Read the value from the static offsets vector buffer.
__ ldr(r3, MemOperand(r2, kPointerSize, PostIndex));
// Store the smi value in the last match info.
__ mov(r3, Operand(r3, LSL, kSmiTagSize));
__ str(r3, MemOperand(r0, kPointerSize, PostIndex));
__ jmp(&next_capture);
__ bind(&done);
// Return last match info.
__ ldr(r0, MemOperand(sp, kLastMatchInfoOffset));
__ add(sp, sp, Operand(4 * kPointerSize));
__ Ret();
// Do the runtime call to execute the regexp.
__ bind(&runtime);
__ TailCallRuntime(Runtime::kRegExpExec, 4, 1);
#endif // V8_INTERPRETED_REGEXP
}
void RegExpConstructResultStub::Generate(MacroAssembler* masm) {
const int kMaxInlineLength = 100;
Label slowcase;
Label done;
Factory* factory = masm->isolate()->factory();
__ ldr(r1, MemOperand(sp, kPointerSize * 2));
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiTagSize == 1);
__ JumpIfNotSmi(r1, &slowcase);
__ cmp(r1, Operand(Smi::FromInt(kMaxInlineLength)));
__ b(hi, &slowcase);
// Smi-tagging is equivalent to multiplying by 2.
// Allocate RegExpResult followed by FixedArray with size in ebx.
// JSArray: [Map][empty properties][Elements][Length-smi][index][input]
// Elements: [Map][Length][..elements..]
// Size of JSArray with two in-object properties and the header of a
// FixedArray.
int objects_size =
(JSRegExpResult::kSize + FixedArray::kHeaderSize) / kPointerSize;
__ mov(r5, Operand(r1, LSR, kSmiTagSize + kSmiShiftSize));
__ add(r2, r5, Operand(objects_size));
__ AllocateInNewSpace(
r2, // In: Size, in words.
r0, // Out: Start of allocation (tagged).
r3, // Scratch register.
r4, // Scratch register.
&slowcase,
static_cast<AllocationFlags>(TAG_OBJECT | SIZE_IN_WORDS));
// r0: Start of allocated area, object-tagged.
// r1: Number of elements in array, as smi.
// r5: Number of elements, untagged.
// Set JSArray map to global.regexp_result_map().
// Set empty properties FixedArray.
// Set elements to point to FixedArray allocated right after the JSArray.
// Interleave operations for better latency.
__ ldr(r2, ContextOperand(cp, Context::GLOBAL_INDEX));
__ add(r3, r0, Operand(JSRegExpResult::kSize));
__ mov(r4, Operand(factory->empty_fixed_array()));
__ ldr(r2, FieldMemOperand(r2, GlobalObject::kGlobalContextOffset));
__ str(r3, FieldMemOperand(r0, JSObject::kElementsOffset));
__ ldr(r2, ContextOperand(r2, Context::REGEXP_RESULT_MAP_INDEX));
__ str(r4, FieldMemOperand(r0, JSObject::kPropertiesOffset));
__ str(r2, FieldMemOperand(r0, HeapObject::kMapOffset));
// Set input, index and length fields from arguments.
__ ldr(r1, MemOperand(sp, kPointerSize * 0));
__ str(r1, FieldMemOperand(r0, JSRegExpResult::kInputOffset));
__ ldr(r1, MemOperand(sp, kPointerSize * 1));
__ str(r1, FieldMemOperand(r0, JSRegExpResult::kIndexOffset));
__ ldr(r1, MemOperand(sp, kPointerSize * 2));
__ str(r1, FieldMemOperand(r0, JSArray::kLengthOffset));
// Fill out the elements FixedArray.
// r0: JSArray, tagged.
// r3: FixedArray, tagged.
// r5: Number of elements in array, untagged.
// Set map.
__ mov(r2, Operand(factory->fixed_array_map()));
__ str(r2, FieldMemOperand(r3, HeapObject::kMapOffset));
// Set FixedArray length.
__ mov(r6, Operand(r5, LSL, kSmiTagSize));
__ str(r6, FieldMemOperand(r3, FixedArray::kLengthOffset));
// Fill contents of fixed-array with the-hole.
__ mov(r2, Operand(factory->the_hole_value()));
__ add(r3, r3, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
// Fill fixed array elements with hole.
// r0: JSArray, tagged.
// r2: the hole.
// r3: Start of elements in FixedArray.
// r5: Number of elements to fill.
Label loop;
__ tst(r5, Operand(r5));
__ bind(&loop);
__ b(le, &done); // Jump if r1 is negative or zero.
__ sub(r5, r5, Operand(1), SetCC);
__ str(r2, MemOperand(r3, r5, LSL, kPointerSizeLog2));
__ jmp(&loop);
__ bind(&done);
__ add(sp, sp, Operand(3 * kPointerSize));
__ Ret();
__ bind(&slowcase);
__ TailCallRuntime(Runtime::kRegExpConstructResult, 3, 1);
}
void CallFunctionStub::Generate(MacroAssembler* masm) {
Label slow, non_function;
// The receiver might implicitly be the global object. This is
// indicated by passing the hole as the receiver to the call
// function stub.
if (ReceiverMightBeImplicit()) {
Label call;
// Get the receiver from the stack.
// function, receiver [, arguments]
__ ldr(r4, MemOperand(sp, argc_ * kPointerSize));
// Call as function is indicated with the hole.
__ CompareRoot(r4, Heap::kTheHoleValueRootIndex);
__ b(ne, &call);
// Patch the receiver on the stack with the global receiver object.
__ ldr(r1, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
__ ldr(r1, FieldMemOperand(r1, GlobalObject::kGlobalReceiverOffset));
__ str(r1, MemOperand(sp, argc_ * kPointerSize));
__ bind(&call);
}
// Get the function to call from the stack.
// function, receiver [, arguments]
__ ldr(r1, MemOperand(sp, (argc_ + 1) * kPointerSize));
// Check that the function is really a JavaScript function.
// r1: pushed function (to be verified)
__ JumpIfSmi(r1, &non_function);
// Get the map of the function object.
__ CompareObjectType(r1, r2, r2, JS_FUNCTION_TYPE);
__ b(ne, &slow);
// Fast-case: Invoke the function now.
// r1: pushed function
ParameterCount actual(argc_);
if (ReceiverMightBeImplicit()) {
Label call_as_function;
__ CompareRoot(r4, Heap::kTheHoleValueRootIndex);
__ b(eq, &call_as_function);
__ InvokeFunction(r1,
actual,
JUMP_FUNCTION,
NullCallWrapper(),
CALL_AS_METHOD);
__ bind(&call_as_function);
}
__ InvokeFunction(r1,
actual,
JUMP_FUNCTION,
NullCallWrapper(),
CALL_AS_FUNCTION);
// Slow-case: Non-function called.
__ bind(&slow);
// Check for function proxy.
__ cmp(r2, Operand(JS_FUNCTION_PROXY_TYPE));
__ b(ne, &non_function);
__ push(r1); // put proxy as additional argument
__ mov(r0, Operand(argc_ + 1, RelocInfo::NONE));
__ mov(r2, Operand(0, RelocInfo::NONE));
__ GetBuiltinEntry(r3, Builtins::CALL_FUNCTION_PROXY);
__ SetCallKind(r5, CALL_AS_FUNCTION);
{
Handle<Code> adaptor =
masm->isolate()->builtins()->ArgumentsAdaptorTrampoline();
__ Jump(adaptor, RelocInfo::CODE_TARGET);
}
// CALL_NON_FUNCTION expects the non-function callee as receiver (instead
// of the original receiver from the call site).
__ bind(&non_function);
__ str(r1, MemOperand(sp, argc_ * kPointerSize));
__ mov(r0, Operand(argc_)); // Setup the number of arguments.
__ mov(r2, Operand(0, RelocInfo::NONE));
__ GetBuiltinEntry(r3, Builtins::CALL_NON_FUNCTION);
__ SetCallKind(r5, CALL_AS_METHOD);
__ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
RelocInfo::CODE_TARGET);
}
// Unfortunately you have to run without snapshots to see most of these
// names in the profile since most compare stubs end up in the snapshot.
void CompareStub::PrintName(StringStream* stream) {
ASSERT((lhs_.is(r0) && rhs_.is(r1)) ||
(lhs_.is(r1) && rhs_.is(r0)));
const char* cc_name;
switch (cc_) {
case lt: cc_name = "LT"; break;
case gt: cc_name = "GT"; break;
case le: cc_name = "LE"; break;
case ge: cc_name = "GE"; break;
case eq: cc_name = "EQ"; break;
case ne: cc_name = "NE"; break;
default: cc_name = "UnknownCondition"; break;
}
bool is_equality = cc_ == eq || cc_ == ne;
stream->Add("CompareStub_%s", cc_name);
stream->Add(lhs_.is(r0) ? "_r0" : "_r1");
stream->Add(rhs_.is(r0) ? "_r0" : "_r1");
if (strict_ && is_equality) stream->Add("_STRICT");
if (never_nan_nan_ && is_equality) stream->Add("_NO_NAN");
if (!include_number_compare_) stream->Add("_NO_NUMBER");
if (!include_smi_compare_) stream->Add("_NO_SMI");
}
int CompareStub::MinorKey() {
// Encode the three parameters in a unique 16 bit value. To avoid duplicate
// stubs the never NaN NaN condition is only taken into account if the
// condition is equals.
ASSERT((static_cast<unsigned>(cc_) >> 28) < (1 << 12));
ASSERT((lhs_.is(r0) && rhs_.is(r1)) ||
(lhs_.is(r1) && rhs_.is(r0)));
return ConditionField::encode(static_cast<unsigned>(cc_) >> 28)
| RegisterField::encode(lhs_.is(r0))
| StrictField::encode(strict_)
| NeverNanNanField::encode(cc_ == eq ? never_nan_nan_ : false)
| IncludeNumberCompareField::encode(include_number_compare_)
| IncludeSmiCompareField::encode(include_smi_compare_);
}
// StringCharCodeAtGenerator
void StringCharCodeAtGenerator::GenerateFast(MacroAssembler* masm) {
Label flat_string;
Label ascii_string;
Label got_char_code;
Label sliced_string;
// If the receiver is a smi trigger the non-string case.
__ JumpIfSmi(object_, receiver_not_string_);
// Fetch the instance type of the receiver into result register.
__ ldr(result_, FieldMemOperand(object_, HeapObject::kMapOffset));
__ ldrb(result_, FieldMemOperand(result_, Map::kInstanceTypeOffset));
// If the receiver is not a string trigger the non-string case.
__ tst(result_, Operand(kIsNotStringMask));
__ b(ne, receiver_not_string_);
// If the index is non-smi trigger the non-smi case.
__ JumpIfNotSmi(index_, &index_not_smi_);
// Put smi-tagged index into scratch register.
__ mov(scratch_, index_);
__ bind(&got_smi_index_);
// Check for index out of range.
__ ldr(ip, FieldMemOperand(object_, String::kLengthOffset));
__ cmp(ip, Operand(scratch_));
__ b(ls, index_out_of_range_);
// We need special handling for non-flat strings.
STATIC_ASSERT(kSeqStringTag == 0);
__ tst(result_, Operand(kStringRepresentationMask));
__ b(eq, &flat_string);
// Handle non-flat strings.
__ and_(result_, result_, Operand(kStringRepresentationMask));
STATIC_ASSERT(kConsStringTag < kExternalStringTag);
STATIC_ASSERT(kSlicedStringTag > kExternalStringTag);
__ cmp(result_, Operand(kExternalStringTag));
__ b(gt, &sliced_string);
__ b(eq, &call_runtime_);
// ConsString.
// Check whether the right hand side is the empty string (i.e. if
// this is really a flat string in a cons string). If that is not
// the case we would rather go to the runtime system now to flatten
// the string.
Label assure_seq_string;
__ ldr(result_, FieldMemOperand(object_, ConsString::kSecondOffset));
__ LoadRoot(ip, Heap::kEmptyStringRootIndex);
__ cmp(result_, Operand(ip));
__ b(ne, &call_runtime_);
// Get the first of the two strings and load its instance type.
__ ldr(object_, FieldMemOperand(object_, ConsString::kFirstOffset));
__ jmp(&assure_seq_string);
// SlicedString, unpack and add offset.
__ bind(&sliced_string);
__ ldr(result_, FieldMemOperand(object_, SlicedString::kOffsetOffset));
__ add(scratch_, scratch_, result_);
__ ldr(object_, FieldMemOperand(object_, SlicedString::kParentOffset));
// Assure that we are dealing with a sequential string. Go to runtime if not.
__ bind(&assure_seq_string);
__ ldr(result_, FieldMemOperand(object_, HeapObject::kMapOffset));
__ ldrb(result_, FieldMemOperand(result_, Map::kInstanceTypeOffset));
// Check that parent is not an external string. Go to runtime otherwise.
STATIC_ASSERT(kSeqStringTag == 0);
__ tst(result_, Operand(kStringRepresentationMask));
__ b(ne, &call_runtime_);
// Check for 1-byte or 2-byte string.
__ bind(&flat_string);
STATIC_ASSERT((kStringEncodingMask & kAsciiStringTag) != 0);
STATIC_ASSERT((kStringEncodingMask & kTwoByteStringTag) == 0);
__ tst(result_, Operand(kStringEncodingMask));
__ b(ne, &ascii_string);
// 2-byte string.
// Load the 2-byte character code into the result register. We can
// add without shifting since the smi tag size is the log2 of the
// number of bytes in a two-byte character.
STATIC_ASSERT(kSmiTag == 0 && kSmiTagSize == 1 && kSmiShiftSize == 0);
__ add(scratch_, object_, Operand(scratch_));
__ ldrh(result_, FieldMemOperand(scratch_, SeqTwoByteString::kHeaderSize));
__ jmp(&got_char_code);
// ASCII string.
// Load the byte into the result register.
__ bind(&ascii_string);
__ add(scratch_, object_, Operand(scratch_, LSR, kSmiTagSize));
__ ldrb(result_, FieldMemOperand(scratch_, SeqAsciiString::kHeaderSize));
__ bind(&got_char_code);
__ mov(result_, Operand(result_, LSL, kSmiTagSize));
__ bind(&exit_);
}
void StringCharCodeAtGenerator::GenerateSlow(
MacroAssembler* masm, const RuntimeCallHelper& call_helper) {
__ Abort("Unexpected fallthrough to CharCodeAt slow case");
// Index is not a smi.
__ bind(&index_not_smi_);
// If index is a heap number, try converting it to an integer.
__ CheckMap(index_,
scratch_,
Heap::kHeapNumberMapRootIndex,
index_not_number_,
DONT_DO_SMI_CHECK);
call_helper.BeforeCall(masm);
__ Push(object_, index_);
__ push(index_); // Consumed by runtime conversion function.
if (index_flags_ == STRING_INDEX_IS_NUMBER) {
__ CallRuntime(Runtime::kNumberToIntegerMapMinusZero, 1);
} else {
ASSERT(index_flags_ == STRING_INDEX_IS_ARRAY_INDEX);
// NumberToSmi discards numbers that are not exact integers.
__ CallRuntime(Runtime::kNumberToSmi, 1);
}
// Save the conversion result before the pop instructions below
// have a chance to overwrite it.
__ Move(scratch_, r0);
__ pop(index_);
__ pop(object_);
// Reload the instance type.
__ ldr(result_, FieldMemOperand(object_, HeapObject::kMapOffset));
__ ldrb(result_, FieldMemOperand(result_, Map::kInstanceTypeOffset));
call_helper.AfterCall(masm);
// If index is still not a smi, it must be out of range.
__ JumpIfNotSmi(scratch_, index_out_of_range_);
// Otherwise, return to the fast path.
__ jmp(&got_smi_index_);
// Call runtime. We get here when the receiver is a string and the
// index is a number, but the code of getting the actual character
// is too complex (e.g., when the string needs to be flattened).
__ bind(&call_runtime_);
call_helper.BeforeCall(masm);
__ Push(object_, index_);
__ CallRuntime(Runtime::kStringCharCodeAt, 2);
__ Move(result_, r0);
call_helper.AfterCall(masm);
__ jmp(&exit_);
__ Abort("Unexpected fallthrough from CharCodeAt slow case");
}
// -------------------------------------------------------------------------
// StringCharFromCodeGenerator
void StringCharFromCodeGenerator::GenerateFast(MacroAssembler* masm) {
// Fast case of Heap::LookupSingleCharacterStringFromCode.
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiShiftSize == 0);
ASSERT(IsPowerOf2(String::kMaxAsciiCharCode + 1));
__ tst(code_,
Operand(kSmiTagMask |
((~String::kMaxAsciiCharCode) << kSmiTagSize)));
__ b(ne, &slow_case_);
__ LoadRoot(result_, Heap::kSingleCharacterStringCacheRootIndex);
// At this point code register contains smi tagged ASCII char code.
STATIC_ASSERT(kSmiTag == 0);
__ add(result_, result_, Operand(code_, LSL, kPointerSizeLog2 - kSmiTagSize));
__ ldr(result_, FieldMemOperand(result_, FixedArray::kHeaderSize));
__ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
__ cmp(result_, Operand(ip));
__ b(eq, &slow_case_);
__ bind(&exit_);
}
void StringCharFromCodeGenerator::GenerateSlow(
MacroAssembler* masm, const RuntimeCallHelper& call_helper) {
__ Abort("Unexpected fallthrough to CharFromCode slow case");
__ bind(&slow_case_);
call_helper.BeforeCall(masm);
__ push(code_);
__ CallRuntime(Runtime::kCharFromCode, 1);
__ Move(result_, r0);
call_helper.AfterCall(masm);
__ jmp(&exit_);
__ Abort("Unexpected fallthrough from CharFromCode slow case");
}
// -------------------------------------------------------------------------
// StringCharAtGenerator
void StringCharAtGenerator::GenerateFast(MacroAssembler* masm) {
char_code_at_generator_.GenerateFast(masm);
char_from_code_generator_.GenerateFast(masm);
}
void StringCharAtGenerator::GenerateSlow(
MacroAssembler* masm, const RuntimeCallHelper& call_helper) {
char_code_at_generator_.GenerateSlow(masm, call_helper);
char_from_code_generator_.GenerateSlow(masm, call_helper);
}
class StringHelper : public AllStatic {
public:
// Generate code for copying characters using a simple loop. This should only
// be used in places where the number of characters is small and the
// additional setup and checking in GenerateCopyCharactersLong adds too much
// overhead. Copying of overlapping regions is not supported.
// Dest register ends at the position after the last character written.
static void GenerateCopyCharacters(MacroAssembler* masm,
Register dest,
Register src,
Register count,
Register scratch,
bool ascii);
// Generate code for copying a large number of characters. This function
// is allowed to spend extra time setting up conditions to make copying
// faster. Copying of overlapping regions is not supported.
// Dest register ends at the position after the last character written.
static void GenerateCopyCharactersLong(MacroAssembler* masm,
Register dest,
Register src,
Register count,
Register scratch1,
Register scratch2,
Register scratch3,
Register scratch4,
Register scratch5,
int flags);
// Probe the symbol table for a two character string. If the string is
// not found by probing a jump to the label not_found is performed. This jump
// does not guarantee that the string is not in the symbol table. If the
// string is found the code falls through with the string in register r0.
// Contents of both c1 and c2 registers are modified. At the exit c1 is
// guaranteed to contain halfword with low and high bytes equal to
// initial contents of c1 and c2 respectively.
static void GenerateTwoCharacterSymbolTableProbe(MacroAssembler* masm,
Register c1,
Register c2,
Register scratch1,
Register scratch2,
Register scratch3,
Register scratch4,
Register scratch5,
Label* not_found);
// Generate string hash.
static void GenerateHashInit(MacroAssembler* masm,
Register hash,
Register character);
static void GenerateHashAddCharacter(MacroAssembler* masm,
Register hash,
Register character);
static void GenerateHashGetHash(MacroAssembler* masm,
Register hash);
private:
DISALLOW_IMPLICIT_CONSTRUCTORS(StringHelper);
};
void StringHelper::GenerateCopyCharacters(MacroAssembler* masm,
Register dest,
Register src,
Register count,
Register scratch,
bool ascii) {
Label loop;
Label done;
// This loop just copies one character at a time, as it is only used for very
// short strings.
if (!ascii) {
__ add(count, count, Operand(count), SetCC);
} else {
__ cmp(count, Operand(0, RelocInfo::NONE));
}
__ b(eq, &done);
__ bind(&loop);
__ ldrb(scratch, MemOperand(src, 1, PostIndex));
// Perform sub between load and dependent store to get the load time to
// complete.
__ sub(count, count, Operand(1), SetCC);
__ strb(scratch, MemOperand(dest, 1, PostIndex));
// last iteration.
__ b(gt, &loop);
__ bind(&done);
}
enum CopyCharactersFlags {
COPY_ASCII = 1,
DEST_ALWAYS_ALIGNED = 2
};
void StringHelper::GenerateCopyCharactersLong(MacroAssembler* masm,
Register dest,
Register src,
Register count,
Register scratch1,
Register scratch2,
Register scratch3,
Register scratch4,
Register scratch5,
int flags) {
bool ascii = (flags & COPY_ASCII) != 0;
bool dest_always_aligned = (flags & DEST_ALWAYS_ALIGNED) != 0;
if (dest_always_aligned && FLAG_debug_code) {
// Check that destination is actually word aligned if the flag says
// that it is.
__ tst(dest, Operand(kPointerAlignmentMask));
__ Check(eq, "Destination of copy not aligned.");
}
const int kReadAlignment = 4;
const int kReadAlignmentMask = kReadAlignment - 1;
// Ensure that reading an entire aligned word containing the last character
// of a string will not read outside the allocated area (because we pad up
// to kObjectAlignment).
STATIC_ASSERT(kObjectAlignment >= kReadAlignment);
// Assumes word reads and writes are little endian.
// Nothing to do for zero characters.
Label done;
if (!ascii) {
__ add(count, count, Operand(count), SetCC);
} else {
__ cmp(count, Operand(0, RelocInfo::NONE));
}
__ b(eq, &done);
// Assume that you cannot read (or write) unaligned.
Label byte_loop;
// Must copy at least eight bytes, otherwise just do it one byte at a time.
__ cmp(count, Operand(8));
__ add(count, dest, Operand(count));
Register limit = count; // Read until src equals this.
__ b(lt, &byte_loop);
if (!dest_always_aligned) {
// Align dest by byte copying. Copies between zero and three bytes.
__ and_(scratch4, dest, Operand(kReadAlignmentMask), SetCC);
Label dest_aligned;
__ b(eq, &dest_aligned);
__ cmp(scratch4, Operand(2));
__ ldrb(scratch1, MemOperand(src, 1, PostIndex));
__ ldrb(scratch2, MemOperand(src, 1, PostIndex), le);
__ ldrb(scratch3, MemOperand(src, 1, PostIndex), lt);
__ strb(scratch1, MemOperand(dest, 1, PostIndex));
__ strb(scratch2, MemOperand(dest, 1, PostIndex), le);
__ strb(scratch3, MemOperand(dest, 1, PostIndex), lt);
__ bind(&dest_aligned);
}
Label simple_loop;
__ sub(scratch4, dest, Operand(src));
__ and_(scratch4, scratch4, Operand(0x03), SetCC);
__ b(eq, &simple_loop);
// Shift register is number of bits in a source word that
// must be combined with bits in the next source word in order
// to create a destination word.
// Complex loop for src/dst that are not aligned the same way.
{
Label loop;
__ mov(scratch4, Operand(scratch4, LSL, 3));
Register left_shift = scratch4;
__ and_(src, src, Operand(~3)); // Round down to load previous word.
__ ldr(scratch1, MemOperand(src, 4, PostIndex));
// Store the "shift" most significant bits of scratch in the least
// signficant bits (i.e., shift down by (32-shift)).
__ rsb(scratch2, left_shift, Operand(32));
Register right_shift = scratch2;
__ mov(scratch1, Operand(scratch1, LSR, right_shift));
__ bind(&loop);
__ ldr(scratch3, MemOperand(src, 4, PostIndex));
__ sub(scratch5, limit, Operand(dest));
__ orr(scratch1, scratch1, Operand(scratch3, LSL, left_shift));
__ str(scratch1, MemOperand(dest, 4, PostIndex));
__ mov(scratch1, Operand(scratch3, LSR, right_shift));
// Loop if four or more bytes left to copy.
// Compare to eight, because we did the subtract before increasing dst.
__ sub(scratch5, scratch5, Operand(8), SetCC);
__ b(ge, &loop);
}
// There is now between zero and three bytes left to copy (negative that
// number is in scratch5), and between one and three bytes already read into
// scratch1 (eight times that number in scratch4). We may have read past
// the end of the string, but because objects are aligned, we have not read
// past the end of the object.
// Find the minimum of remaining characters to move and preloaded characters
// and write those as bytes.
__ add(scratch5, scratch5, Operand(4), SetCC);
__ b(eq, &done);
__ cmp(scratch4, Operand(scratch5, LSL, 3), ne);
// Move minimum of bytes read and bytes left to copy to scratch4.
__ mov(scratch5, Operand(scratch4, LSR, 3), LeaveCC, lt);
// Between one and three (value in scratch5) characters already read into
// scratch ready to write.
__ cmp(scratch5, Operand(2));
__ strb(scratch1, MemOperand(dest, 1, PostIndex));
__ mov(scratch1, Operand(scratch1, LSR, 8), LeaveCC, ge);
__ strb(scratch1, MemOperand(dest, 1, PostIndex), ge);
__ mov(scratch1, Operand(scratch1, LSR, 8), LeaveCC, gt);
__ strb(scratch1, MemOperand(dest, 1, PostIndex), gt);
// Copy any remaining bytes.
__ b(&byte_loop);
// Simple loop.
// Copy words from src to dst, until less than four bytes left.
// Both src and dest are word aligned.
__ bind(&simple_loop);
{
Label loop;
__ bind(&loop);
__ ldr(scratch1, MemOperand(src, 4, PostIndex));
__ sub(scratch3, limit, Operand(dest));
__ str(scratch1, MemOperand(dest, 4, PostIndex));
// Compare to 8, not 4, because we do the substraction before increasing
// dest.
__ cmp(scratch3, Operand(8));
__ b(ge, &loop);
}
// Copy bytes from src to dst until dst hits limit.
__ bind(&byte_loop);
__ cmp(dest, Operand(limit));
__ ldrb(scratch1, MemOperand(src, 1, PostIndex), lt);
__ b(ge, &done);
__ strb(scratch1, MemOperand(dest, 1, PostIndex));
__ b(&byte_loop);
__ bind(&done);
}
void StringHelper::GenerateTwoCharacterSymbolTableProbe(MacroAssembler* masm,
Register c1,
Register c2,
Register scratch1,
Register scratch2,
Register scratch3,
Register scratch4,
Register scratch5,
Label* not_found) {
// Register scratch3 is the general scratch register in this function.
Register scratch = scratch3;
// Make sure that both characters are not digits as such strings has a
// different hash algorithm. Don't try to look for these in the symbol table.
Label not_array_index;
__ sub(scratch, c1, Operand(static_cast<int>('0')));
__ cmp(scratch, Operand(static_cast<int>('9' - '0')));
__ b(hi, &not_array_index);
__ sub(scratch, c2, Operand(static_cast<int>('0')));
__ cmp(scratch, Operand(static_cast<int>('9' - '0')));
// If check failed combine both characters into single halfword.
// This is required by the contract of the method: code at the
// not_found branch expects this combination in c1 register
__ orr(c1, c1, Operand(c2, LSL, kBitsPerByte), LeaveCC, ls);
__ b(ls, not_found);
__ bind(&not_array_index);
// Calculate the two character string hash.
Register hash = scratch1;
StringHelper::GenerateHashInit(masm, hash, c1);
StringHelper::GenerateHashAddCharacter(masm, hash, c2);
StringHelper::GenerateHashGetHash(masm, hash);
// Collect the two characters in a register.
Register chars = c1;
__ orr(chars, chars, Operand(c2, LSL, kBitsPerByte));
// chars: two character string, char 1 in byte 0 and char 2 in byte 1.
// hash: hash of two character string.
// Load symbol table
// Load address of first element of the symbol table.
Register symbol_table = c2;
__ LoadRoot(symbol_table, Heap::kSymbolTableRootIndex);
Register undefined = scratch4;
__ LoadRoot(undefined, Heap::kUndefinedValueRootIndex);
// Calculate capacity mask from the symbol table capacity.
Register mask = scratch2;
__ ldr(mask, FieldMemOperand(symbol_table, SymbolTable::kCapacityOffset));
__ mov(mask, Operand(mask, ASR, 1));
__ sub(mask, mask, Operand(1));
// Calculate untagged address of the first element of the symbol table.
Register first_symbol_table_element = symbol_table;
__ add(first_symbol_table_element, symbol_table,
Operand(SymbolTable::kElementsStartOffset - kHeapObjectTag));
// Registers
// chars: two character string, char 1 in byte 0 and char 2 in byte 1.
// hash: hash of two character string
// mask: capacity mask
// first_symbol_table_element: address of the first element of
// the symbol table
// undefined: the undefined object
// scratch: -
// Perform a number of probes in the symbol table.
static const int kProbes = 4;
Label found_in_symbol_table;
Label next_probe[kProbes];
for (int i = 0; i < kProbes; i++) {
Register candidate = scratch5; // Scratch register contains candidate.
// Calculate entry in symbol table.
if (i > 0) {
__ add(candidate, hash, Operand(SymbolTable::GetProbeOffset(i)));
} else {
__ mov(candidate, hash);
}
__ and_(candidate, candidate, Operand(mask));
// Load the entry from the symble table.
STATIC_ASSERT(SymbolTable::kEntrySize == 1);
__ ldr(candidate,
MemOperand(first_symbol_table_element,
candidate,
LSL,
kPointerSizeLog2));
// If entry is undefined no string with this hash can be found.
Label is_string;
__ CompareObjectType(candidate, scratch, scratch, ODDBALL_TYPE);
__ b(ne, &is_string);
__ cmp(undefined, candidate);
__ b(eq, not_found);
// Must be null (deleted entry).
if (FLAG_debug_code) {
__ LoadRoot(ip, Heap::kNullValueRootIndex);
__ cmp(ip, candidate);
__ Assert(eq, "oddball in symbol table is not undefined or null");
}
__ jmp(&next_probe[i]);
__ bind(&is_string);
// Check that the candidate is a non-external ASCII string. The instance
// type is still in the scratch register from the CompareObjectType
// operation.
__ JumpIfInstanceTypeIsNotSequentialAscii(scratch, scratch, &next_probe[i]);
// If length is not 2 the string is not a candidate.
__ ldr(scratch, FieldMemOperand(candidate, String::kLengthOffset));
__ cmp(scratch, Operand(Smi::FromInt(2)));
__ b(ne, &next_probe[i]);
// Check if the two characters match.
// Assumes that word load is little endian.
__ ldrh(scratch, FieldMemOperand(candidate, SeqAsciiString::kHeaderSize));
__ cmp(chars, scratch);
__ b(eq, &found_in_symbol_table);
__ bind(&next_probe[i]);
}
// No matching 2 character string found by probing.
__ jmp(not_found);
// Scratch register contains result when we fall through to here.
Register result = scratch;
__ bind(&found_in_symbol_table);
__ Move(r0, result);
}
void StringHelper::GenerateHashInit(MacroAssembler* masm,
Register hash,
Register character) {
// hash = character + (character << 10);
__ add(hash, character, Operand(character, LSL, 10));
// hash ^= hash >> 6;
__ eor(hash, hash, Operand(hash, ASR, 6));
}
void StringHelper::GenerateHashAddCharacter(MacroAssembler* masm,
Register hash,
Register character) {
// hash += character;
__ add(hash, hash, Operand(character));
// hash += hash << 10;
__ add(hash, hash, Operand(hash, LSL, 10));
// hash ^= hash >> 6;
__ eor(hash, hash, Operand(hash, ASR, 6));
}
void StringHelper::GenerateHashGetHash(MacroAssembler* masm,
Register hash) {
// hash += hash << 3;
__ add(hash, hash, Operand(hash, LSL, 3));
// hash ^= hash >> 11;
__ eor(hash, hash, Operand(hash, ASR, 11));
// hash += hash << 15;
__ add(hash, hash, Operand(hash, LSL, 15), SetCC);
// if (hash == 0) hash = 27;
__ mov(hash, Operand(27), LeaveCC, ne);
}
void SubStringStub::Generate(MacroAssembler* masm) {
Label runtime;
// Stack frame on entry.
// lr: return address
// sp[0]: to
// sp[4]: from
// sp[8]: string
// This stub is called from the native-call %_SubString(...), so
// nothing can be assumed about the arguments. It is tested that:
// "string" is a sequential string,
// both "from" and "to" are smis, and
// 0 <= from <= to <= string.length.
// If any of these assumptions fail, we call the runtime system.
static const int kToOffset = 0 * kPointerSize;
static const int kFromOffset = 1 * kPointerSize;
static const int kStringOffset = 2 * kPointerSize;
// Check bounds and smi-ness.
Register to = r6;
Register from = r7;
__ Ldrd(to, from, MemOperand(sp, kToOffset));
STATIC_ASSERT(kFromOffset == kToOffset + 4);
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 1);
// I.e., arithmetic shift right by one un-smi-tags.
__ mov(r2, Operand(to, ASR, 1), SetCC);
__ mov(r3, Operand(from, ASR, 1), SetCC, cc);
// If either to or from had the smi tag bit set, then carry is set now.
__ b(cs, &runtime); // Either "from" or "to" is not a smi.
__ b(mi, &runtime); // From is negative.
// Both to and from are smis.
__ sub(r2, r2, Operand(r3), SetCC);
__ b(mi, &runtime); // Fail if from > to.
// Special handling of sub-strings of length 1 and 2. One character strings
// are handled in the runtime system (looked up in the single character
// cache). Two character strings are looked for in the symbol cache in
// generated code.
__ cmp(r2, Operand(2));
__ b(lt, &runtime);
// r2: result string length
// r3: from index (untagged smi)
// r6 (a.k.a. to): to (smi)
// r7 (a.k.a. from): from offset (smi)
// Make sure first argument is a sequential (or flat) string.
__ ldr(r0, MemOperand(sp, kStringOffset));
STATIC_ASSERT(kSmiTag == 0);
__ JumpIfSmi(r0, &runtime);
Condition is_string = masm->IsObjectStringType(r0, r1);
__ b(NegateCondition(is_string), &runtime);
// Short-cut for the case of trivial substring.
Label return_r0;
// r0: original string
// r2: result string length
__ ldr(r4, FieldMemOperand(r0, String::kLengthOffset));
__ cmp(r2, Operand(r4, ASR, 1));
__ b(eq, &return_r0);
Label create_slice;
if (FLAG_string_slices) {
__ cmp(r2, Operand(SlicedString::kMinLength));
__ b(ge, &create_slice);
}
// r0: original string
// r1: instance type
// r2: result string length
// r3: from index (untagged smi)
// r6 (a.k.a. to): to (smi)
// r7 (a.k.a. from): from offset (smi)
Label seq_string;
__ and_(r4, r1, Operand(kStringRepresentationMask));
STATIC_ASSERT(kSeqStringTag < kConsStringTag);
STATIC_ASSERT(kConsStringTag < kExternalStringTag);
STATIC_ASSERT(kConsStringTag < kSlicedStringTag);
__ cmp(r4, Operand(kConsStringTag));
__ b(gt, &runtime); // Slices and external strings go to runtime.
__ b(lt, &seq_string); // Sequential strings are handled directly.
// Cons string. Try to recurse (once) on the first substring.
// (This adds a little more generality than necessary to handle flattened
// cons strings, but not much).
__ ldr(r0, FieldMemOperand(r0, ConsString::kFirstOffset));
__ ldr(r4, FieldMemOperand(r0, HeapObject::kMapOffset));
__ ldrb(r1, FieldMemOperand(r4, Map::kInstanceTypeOffset));
__ tst(r1, Operand(kStringRepresentationMask));
STATIC_ASSERT(kSeqStringTag == 0);
__ b(ne, &runtime); // Cons, slices and external strings go to runtime.
// Definitly a sequential string.
__ bind(&seq_string);
// r0: original string
// r1: instance type
// r2: result string length
// r3: from index (untagged smi)
// r6 (a.k.a. to): to (smi)
// r7 (a.k.a. from): from offset (smi)
__ ldr(r4, FieldMemOperand(r0, String::kLengthOffset));
__ cmp(r4, Operand(to));
__ b(lt, &runtime); // Fail if to > length.
to = no_reg;
// r0: original string or left hand side of the original cons string.
// r1: instance type
// r2: result string length
// r3: from index (untagged smi)
// r7 (a.k.a. from): from offset (smi)
// Check for flat ASCII string.
Label non_ascii_flat;
__ tst(r1, Operand(kStringEncodingMask));
STATIC_ASSERT(kTwoByteStringTag == 0);
__ b(eq, &non_ascii_flat);
Label result_longer_than_two;
__ cmp(r2, Operand(2));
__ b(gt, &result_longer_than_two);
// Sub string of length 2 requested.
// Get the two characters forming the sub string.
__ add(r0, r0, Operand(r3));
__ ldrb(r3, FieldMemOperand(r0, SeqAsciiString::kHeaderSize));
__ ldrb(r4, FieldMemOperand(r0, SeqAsciiString::kHeaderSize + 1));
// Try to lookup two character string in symbol table.
Label make_two_character_string;
StringHelper::GenerateTwoCharacterSymbolTableProbe(
masm, r3, r4, r1, r5, r6, r7, r9, &make_two_character_string);
Counters* counters = masm->isolate()->counters();
__ jmp(&return_r0);
// r2: result string length.
// r3: two characters combined into halfword in little endian byte order.
__ bind(&make_two_character_string);
__ AllocateAsciiString(r0, r2, r4, r5, r9, &runtime);
__ strh(r3, FieldMemOperand(r0, SeqAsciiString::kHeaderSize));
__ jmp(&return_r0);
__ bind(&result_longer_than_two);
// Locate 'from' character of string.
__ add(r5, r0, Operand(SeqAsciiString::kHeaderSize - kHeapObjectTag));
__ add(r5, r5, Operand(from, ASR, 1));
// Allocate the result.
__ AllocateAsciiString(r0, r2, r3, r4, r1, &runtime);
// r0: result string
// r2: result string length
// r5: first character of substring to copy
// r7 (a.k.a. from): from offset (smi)
// Locate first character of result.
__ add(r1, r0, Operand(SeqAsciiString::kHeaderSize - kHeapObjectTag));
// r0: result string
// r1: first character of result string
// r2: result string length
// r5: first character of substring to copy
STATIC_ASSERT((SeqAsciiString::kHeaderSize & kObjectAlignmentMask) == 0);
StringHelper::GenerateCopyCharactersLong(masm, r1, r5, r2, r3, r4, r6, r7, r9,
COPY_ASCII | DEST_ALWAYS_ALIGNED);
__ jmp(&return_r0);
__ bind(&non_ascii_flat);
// r0: original string
// r2: result string length
// r7 (a.k.a. from): from offset (smi)
// Check for flat two byte string.
// Locate 'from' character of string.
__ add(r5, r0, Operand(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
// As "from" is a smi it is 2 times the value which matches the size of a two
// byte character.
STATIC_ASSERT(kSmiTagSize == 1 && kSmiTag == 0);
__ add(r5, r5, Operand(from));
// Allocate the result.
__ AllocateTwoByteString(r0, r2, r1, r3, r4, &runtime);
// r0: result string
// r2: result string length
// r5: first character of substring to copy
// Locate first character of result.
__ add(r1, r0, Operand(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
from = no_reg;
// r0: result string.
// r1: first character of result.
// r2: result length.
// r5: first character of substring to copy.
STATIC_ASSERT((SeqTwoByteString::kHeaderSize & kObjectAlignmentMask) == 0);
StringHelper::GenerateCopyCharactersLong(
masm, r1, r5, r2, r3, r4, r6, r7, r9, DEST_ALWAYS_ALIGNED);
__ jmp(&return_r0);
if (FLAG_string_slices) {
__ bind(&create_slice);
// r0: original string
// r1: instance type
// r2: length
// r3: from index (untagged smi)
// r6 (a.k.a. to): to (smi)
// r7 (a.k.a. from): from offset (smi)
Label allocate_slice, sliced_string, seq_string;
STATIC_ASSERT(kSeqStringTag == 0);
__ tst(r1, Operand(kStringRepresentationMask));
__ b(eq, &seq_string);
STATIC_ASSERT(kIsIndirectStringMask == (kSlicedStringTag & kConsStringTag));
STATIC_ASSERT(kIsIndirectStringMask != 0);
__ tst(r1, Operand(kIsIndirectStringMask));
// External string. Jump to runtime.
__ b(eq, &runtime);
__ tst(r1, Operand(kSlicedNotConsMask));
__ b(ne, &sliced_string);
// Cons string. Check whether it is flat, then fetch first part.
__ ldr(r5, FieldMemOperand(r0, ConsString::kSecondOffset));
__ LoadRoot(r9, Heap::kEmptyStringRootIndex);
__ cmp(r5, r9);
__ b(ne, &runtime);
__ ldr(r5, FieldMemOperand(r0, ConsString::kFirstOffset));
__ jmp(&allocate_slice);
__ bind(&sliced_string);
// Sliced string. Fetch parent and correct start index by offset.
__ ldr(r5, FieldMemOperand(r0, SlicedString::kOffsetOffset));
__ add(r7, r7, r5);
__ ldr(r5, FieldMemOperand(r0, SlicedString::kParentOffset));
__ jmp(&allocate_slice);
__ bind(&seq_string);
// Sequential string. Just move string to the right register.
__ mov(r5, r0);
__ bind(&allocate_slice);
// r1: instance type of original string
// r2: length
// r5: underlying subject string
// r7 (a.k.a. from): from offset (smi)
// Allocate new sliced string. At this point we do not reload the instance
// type including the string encoding because we simply rely on the info
// provided by the original string. It does not matter if the original
// string's encoding is wrong because we always have to recheck encoding of
// the newly created string's parent anyways due to externalized strings.
Label two_byte_slice, set_slice_header;
STATIC_ASSERT((kStringEncodingMask & kAsciiStringTag) != 0);
STATIC_ASSERT((kStringEncodingMask & kTwoByteStringTag) == 0);
__ tst(r1, Operand(kStringEncodingMask));
__ b(eq, &two_byte_slice);
__ AllocateAsciiSlicedString(r0, r2, r3, r4, &runtime);
__ jmp(&set_slice_header);
__ bind(&two_byte_slice);
__ AllocateTwoByteSlicedString(r0, r2, r3, r4, &runtime);
__ bind(&set_slice_header);
__ str(r7, FieldMemOperand(r0, SlicedString::kOffsetOffset));
__ str(r5, FieldMemOperand(r0, SlicedString::kParentOffset));
}
__ bind(&return_r0);
__ IncrementCounter(counters->sub_string_native(), 1, r3, r4);
__ add(sp, sp, Operand(3 * kPointerSize));
__ Ret();
// Just jump to runtime to create the sub string.
__ bind(&runtime);
__ TailCallRuntime(Runtime::kSubString, 3, 1);
}
void StringCompareStub::GenerateFlatAsciiStringEquals(MacroAssembler* masm,
Register left,
Register right,
Register scratch1,
Register scratch2,
Register scratch3) {
Register length = scratch1;
// Compare lengths.
Label strings_not_equal, check_zero_length;
__ ldr(length, FieldMemOperand(left, String::kLengthOffset));
__ ldr(scratch2, FieldMemOperand(right, String::kLengthOffset));
__ cmp(length, scratch2);
__ b(eq, &check_zero_length);
__ bind(&strings_not_equal);
__ mov(r0, Operand(Smi::FromInt(NOT_EQUAL)));
__ Ret();
// Check if the length is zero.
Label compare_chars;
__ bind(&check_zero_length);
STATIC_ASSERT(kSmiTag == 0);
__ tst(length, Operand(length));
__ b(ne, &compare_chars);
__ mov(r0, Operand(Smi::FromInt(EQUAL)));
__ Ret();
// Compare characters.
__ bind(&compare_chars);
GenerateAsciiCharsCompareLoop(masm,
left, right, length, scratch2, scratch3,
&strings_not_equal);
// Characters are equal.
__ mov(r0, Operand(Smi::FromInt(EQUAL)));
__ Ret();
}
void StringCompareStub::GenerateCompareFlatAsciiStrings(MacroAssembler* masm,
Register left,
Register right,
Register scratch1,
Register scratch2,
Register scratch3,
Register scratch4) {
Label result_not_equal, compare_lengths;
// Find minimum length and length difference.
__ ldr(scratch1, FieldMemOperand(left, String::kLengthOffset));
__ ldr(scratch2, FieldMemOperand(right, String::kLengthOffset));
__ sub(scratch3, scratch1, Operand(scratch2), SetCC);
Register length_delta = scratch3;
__ mov(scratch1, scratch2, LeaveCC, gt);
Register min_length = scratch1;
STATIC_ASSERT(kSmiTag == 0);
__ tst(min_length, Operand(min_length));
__ b(eq, &compare_lengths);
// Compare loop.
GenerateAsciiCharsCompareLoop(masm,
left, right, min_length, scratch2, scratch4,
&result_not_equal);
// Compare lengths - strings up to min-length are equal.
__ bind(&compare_lengths);
ASSERT(Smi::FromInt(EQUAL) == static_cast<Smi*>(0));
// Use length_delta as result if it's zero.
__ mov(r0, Operand(length_delta), SetCC);
__ bind(&result_not_equal);
// Conditionally update the result based either on length_delta or
// the last comparion performed in the loop above.
__ mov(r0, Operand(Smi::FromInt(GREATER)), LeaveCC, gt);
__ mov(r0, Operand(Smi::FromInt(LESS)), LeaveCC, lt);
__ Ret();
}
void StringCompareStub::GenerateAsciiCharsCompareLoop(
MacroAssembler* masm,
Register left,
Register right,
Register length,
Register scratch1,
Register scratch2,
Label* chars_not_equal) {
// Change index to run from -length to -1 by adding length to string
// start. This means that loop ends when index reaches zero, which
// doesn't need an additional compare.
__ SmiUntag(length);
__ add(scratch1, length,
Operand(SeqAsciiString::kHeaderSize - kHeapObjectTag));
__ add(left, left, Operand(scratch1));
__ add(right, right, Operand(scratch1));
__ rsb(length, length, Operand::Zero());
Register index = length; // index = -length;
// Compare loop.
Label loop;
__ bind(&loop);
__ ldrb(scratch1, MemOperand(left, index));
__ ldrb(scratch2, MemOperand(right, index));
__ cmp(scratch1, scratch2);
__ b(ne, chars_not_equal);
__ add(index, index, Operand(1), SetCC);
__ b(ne, &loop);
}
void StringCompareStub::Generate(MacroAssembler* masm) {
Label runtime;
Counters* counters = masm->isolate()->counters();
// Stack frame on entry.
// sp[0]: right string
// sp[4]: left string
__ Ldrd(r0 , r1, MemOperand(sp)); // Load right in r0, left in r1.
Label not_same;
__ cmp(r0, r1);
__ b(ne, &not_same);
STATIC_ASSERT(EQUAL == 0);
STATIC_ASSERT(kSmiTag == 0);
__ mov(r0, Operand(Smi::FromInt(EQUAL)));
__ IncrementCounter(counters->string_compare_native(), 1, r1, r2);
__ add(sp, sp, Operand(2 * kPointerSize));
__ Ret();
__ bind(&not_same);
// Check that both objects are sequential ASCII strings.
__ JumpIfNotBothSequentialAsciiStrings(r1, r0, r2, r3, &runtime);
// Compare flat ASCII strings natively. Remove arguments from stack first.
__ IncrementCounter(counters->string_compare_native(), 1, r2, r3);
__ add(sp, sp, Operand(2 * kPointerSize));
GenerateCompareFlatAsciiStrings(masm, r1, r0, r2, r3, r4, r5);
// Call the runtime; it returns -1 (less), 0 (equal), or 1 (greater)
// tagged as a small integer.
__ bind(&runtime);
__ TailCallRuntime(Runtime::kStringCompare, 2, 1);
}
void StringAddStub::Generate(MacroAssembler* masm) {
Label string_add_runtime, call_builtin;
Builtins::JavaScript builtin_id = Builtins::ADD;
Counters* counters = masm->isolate()->counters();
// Stack on entry:
// sp[0]: second argument (right).
// sp[4]: first argument (left).
// Load the two arguments.
__ ldr(r0, MemOperand(sp, 1 * kPointerSize)); // First argument.
__ ldr(r1, MemOperand(sp, 0 * kPointerSize)); // Second argument.
// Make sure that both arguments are strings if not known in advance.
if (flags_ == NO_STRING_ADD_FLAGS) {
__ JumpIfEitherSmi(r0, r1, &string_add_runtime);
// Load instance types.
__ ldr(r4, FieldMemOperand(r0, HeapObject::kMapOffset));
__ ldr(r5, FieldMemOperand(r1, HeapObject::kMapOffset));
__ ldrb(r4, FieldMemOperand(r4, Map::kInstanceTypeOffset));
__ ldrb(r5, FieldMemOperand(r5, Map::kInstanceTypeOffset));
STATIC_ASSERT(kStringTag == 0);
// If either is not a string, go to runtime.
__ tst(r4, Operand(kIsNotStringMask));
__ tst(r5, Operand(kIsNotStringMask), eq);
__ b(ne, &string_add_runtime);
} else {
// Here at least one of the arguments is definitely a string.
// We convert the one that is not known to be a string.
if ((flags_ & NO_STRING_CHECK_LEFT_IN_STUB) == 0) {
ASSERT((flags_ & NO_STRING_CHECK_RIGHT_IN_STUB) != 0);
GenerateConvertArgument(
masm, 1 * kPointerSize, r0, r2, r3, r4, r5, &call_builtin);
builtin_id = Builtins::STRING_ADD_RIGHT;
} else if ((flags_ & NO_STRING_CHECK_RIGHT_IN_STUB) == 0) {
ASSERT((flags_ & NO_STRING_CHECK_LEFT_IN_STUB) != 0);
GenerateConvertArgument(
masm, 0 * kPointerSize, r1, r2, r3, r4, r5, &call_builtin);
builtin_id = Builtins::STRING_ADD_LEFT;
}
}
// Both arguments are strings.
// r0: first string
// r1: second string
// r4: first string instance type (if flags_ == NO_STRING_ADD_FLAGS)
// r5: second string instance type (if flags_ == NO_STRING_ADD_FLAGS)
{
Label strings_not_empty;
// Check if either of the strings are empty. In that case return the other.
__ ldr(r2, FieldMemOperand(r0, String::kLengthOffset));
__ ldr(r3, FieldMemOperand(r1, String::kLengthOffset));
STATIC_ASSERT(kSmiTag == 0);
__ cmp(r2, Operand(Smi::FromInt(0))); // Test if first string is empty.
__ mov(r0, Operand(r1), LeaveCC, eq); // If first is empty, return second.
STATIC_ASSERT(kSmiTag == 0);
// Else test if second string is empty.
__ cmp(r3, Operand(Smi::FromInt(0)), ne);
__ b(ne, &strings_not_empty); // If either string was empty, return r0.
__ IncrementCounter(counters->string_add_native(), 1, r2, r3);
__ add(sp, sp, Operand(2 * kPointerSize));
__ Ret();
__ bind(&strings_not_empty);
}
__ mov(r2, Operand(r2, ASR, kSmiTagSize));
__ mov(r3, Operand(r3, ASR, kSmiTagSize));
// Both strings are non-empty.
// r0: first string
// r1: second string
// r2: length of first string
// r3: length of second string
// r4: first string instance type (if flags_ == NO_STRING_ADD_FLAGS)
// r5: second string instance type (if flags_ == NO_STRING_ADD_FLAGS)
// Look at the length of the result of adding the two strings.
Label string_add_flat_result, longer_than_two;
// Adding two lengths can't overflow.
STATIC_ASSERT(String::kMaxLength < String::kMaxLength * 2);
__ add(r6, r2, Operand(r3));
// Use the symbol table when adding two one character strings, as it
// helps later optimizations to return a symbol here.
__ cmp(r6, Operand(2));
__ b(ne, &longer_than_two);
// Check that both strings are non-external ASCII strings.
if (flags_ != NO_STRING_ADD_FLAGS) {
__ ldr(r4, FieldMemOperand(r0, HeapObject::kMapOffset));
__ ldr(r5, FieldMemOperand(r1, HeapObject::kMapOffset));
__ ldrb(r4, FieldMemOperand(r4, Map::kInstanceTypeOffset));
__ ldrb(r5, FieldMemOperand(r5, Map::kInstanceTypeOffset));
}
__ JumpIfBothInstanceTypesAreNotSequentialAscii(r4, r5, r6, r7,
&string_add_runtime);
// Get the two characters forming the sub string.
__ ldrb(r2, FieldMemOperand(r0, SeqAsciiString::kHeaderSize));
__ ldrb(r3, FieldMemOperand(r1, SeqAsciiString::kHeaderSize));
// Try to lookup two character string in symbol table. If it is not found
// just allocate a new one.
Label make_two_character_string;
StringHelper::GenerateTwoCharacterSymbolTableProbe(
masm, r2, r3, r6, r7, r4, r5, r9, &make_two_character_string);
__ IncrementCounter(counters->string_add_native(), 1, r2, r3);
__ add(sp, sp, Operand(2 * kPointerSize));
__ Ret();
__ bind(&make_two_character_string);
// Resulting string has length 2 and first chars of two strings
// are combined into single halfword in r2 register.
// So we can fill resulting string without two loops by a single
// halfword store instruction (which assumes that processor is
// in a little endian mode)
__ mov(r6, Operand(2));
__ AllocateAsciiString(r0, r6, r4, r5, r9, &string_add_runtime);
__ strh(r2, FieldMemOperand(r0, SeqAsciiString::kHeaderSize));
__ IncrementCounter(counters->string_add_native(), 1, r2, r3);
__ add(sp, sp, Operand(2 * kPointerSize));
__ Ret();
__ bind(&longer_than_two);
// Check if resulting string will be flat.
__ cmp(r6, Operand(String::kMinNonFlatLength));
__ b(lt, &string_add_flat_result);
// Handle exceptionally long strings in the runtime system.
STATIC_ASSERT((String::kMaxLength & 0x80000000) == 0);
ASSERT(IsPowerOf2(String::kMaxLength + 1));
// kMaxLength + 1 is representable as shifted literal, kMaxLength is not.
__ cmp(r6, Operand(String::kMaxLength + 1));
__ b(hs, &string_add_runtime);
// If result is not supposed to be flat, allocate a cons string object.
// If both strings are ASCII the result is an ASCII cons string.
if (flags_ != NO_STRING_ADD_FLAGS) {
__ ldr(r4, FieldMemOperand(r0, HeapObject::kMapOffset));
__ ldr(r5, FieldMemOperand(r1, HeapObject::kMapOffset));
__ ldrb(r4, FieldMemOperand(r4, Map::kInstanceTypeOffset));
__ ldrb(r5, FieldMemOperand(r5, Map::kInstanceTypeOffset));
}
Label non_ascii, allocated, ascii_data;
STATIC_ASSERT(kTwoByteStringTag == 0);
__ tst(r4, Operand(kStringEncodingMask));
__ tst(r5, Operand(kStringEncodingMask), ne);
__ b(eq, &non_ascii);
// Allocate an ASCII cons string.
__ bind(&ascii_data);
__ AllocateAsciiConsString(r7, r6, r4, r5, &string_add_runtime);
__ bind(&allocated);
// Fill the fields of the cons string.
__ str(r0, FieldMemOperand(r7, ConsString::kFirstOffset));
__ str(r1, FieldMemOperand(r7, ConsString::kSecondOffset));
__ mov(r0, Operand(r7));
__ IncrementCounter(counters->string_add_native(), 1, r2, r3);
__ add(sp, sp, Operand(2 * kPointerSize));
__ Ret();
__ bind(&non_ascii);
// At least one of the strings is two-byte. Check whether it happens
// to contain only ASCII characters.
// r4: first instance type.
// r5: second instance type.
__ tst(r4, Operand(kAsciiDataHintMask));
__ tst(r5, Operand(kAsciiDataHintMask), ne);
__ b(ne, &ascii_data);
__ eor(r4, r4, Operand(r5));
STATIC_ASSERT(kAsciiStringTag != 0 && kAsciiDataHintTag != 0);
__ and_(r4, r4, Operand(kAsciiStringTag | kAsciiDataHintTag));
__ cmp(r4, Operand(kAsciiStringTag | kAsciiDataHintTag));
__ b(eq, &ascii_data);
// Allocate a two byte cons string.
__ AllocateTwoByteConsString(r7, r6, r4, r5, &string_add_runtime);
__ jmp(&allocated);
// Handle creating a flat result. First check that both strings are
// sequential and that they have the same encoding.
// r0: first string
// r1: second string
// r2: length of first string
// r3: length of second string
// r4: first string instance type (if flags_ == NO_STRING_ADD_FLAGS)
// r5: second string instance type (if flags_ == NO_STRING_ADD_FLAGS)
// r6: sum of lengths.
__ bind(&string_add_flat_result);
if (flags_ != NO_STRING_ADD_FLAGS) {
__ ldr(r4, FieldMemOperand(r0, HeapObject::kMapOffset));
__ ldr(r5, FieldMemOperand(r1, HeapObject::kMapOffset));
__ ldrb(r4, FieldMemOperand(r4, Map::kInstanceTypeOffset));
__ ldrb(r5, FieldMemOperand(r5, Map::kInstanceTypeOffset));
}
// Check that both strings are sequential.
STATIC_ASSERT(kSeqStringTag == 0);
__ tst(r4, Operand(kStringRepresentationMask));
__ tst(r5, Operand(kStringRepresentationMask), eq);
__ b(ne, &string_add_runtime);
// Now check if both strings have the same encoding (ASCII/Two-byte).
// r0: first string.
// r1: second string.
// r2: length of first string.
// r3: length of second string.
// r6: sum of lengths..
Label non_ascii_string_add_flat_result;
ASSERT(IsPowerOf2(kStringEncodingMask)); // Just one bit to test.
__ eor(r7, r4, Operand(r5));
__ tst(r7, Operand(kStringEncodingMask));
__ b(ne, &string_add_runtime);
// And see if it's ASCII or two-byte.
__ tst(r4, Operand(kStringEncodingMask));
__ b(eq, &non_ascii_string_add_flat_result);
// Both strings are sequential ASCII strings. We also know that they are
// short (since the sum of the lengths is less than kMinNonFlatLength).
// r6: length of resulting flat string
__ AllocateAsciiString(r7, r6, r4, r5, r9, &string_add_runtime);
// Locate first character of result.
__ add(r6, r7, Operand(SeqAsciiString::kHeaderSize - kHeapObjectTag));
// Locate first character of first argument.
__ add(r0, r0, Operand(SeqAsciiString::kHeaderSize - kHeapObjectTag));
// r0: first character of first string.
// r1: second string.
// r2: length of first string.
// r3: length of second string.
// r6: first character of result.
// r7: result string.
StringHelper::GenerateCopyCharacters(masm, r6, r0, r2, r4, true);
// Load second argument and locate first character.
__ add(r1, r1, Operand(SeqAsciiString::kHeaderSize - kHeapObjectTag));
// r1: first character of second string.
// r3: length of second string.
// r6: next character of result.
// r7: result string.
StringHelper::GenerateCopyCharacters(masm, r6, r1, r3, r4, true);
__ mov(r0, Operand(r7));
__ IncrementCounter(counters->string_add_native(), 1, r2, r3);
__ add(sp, sp, Operand(2 * kPointerSize));
__ Ret();
__ bind(&non_ascii_string_add_flat_result);
// Both strings are sequential two byte strings.
// r0: first string.
// r1: second string.
// r2: length of first string.
// r3: length of second string.
// r6: sum of length of strings.
__ AllocateTwoByteString(r7, r6, r4, r5, r9, &string_add_runtime);
// r0: first string.
// r1: second string.
// r2: length of first string.
// r3: length of second string.
// r7: result string.
// Locate first character of result.
__ add(r6, r7, Operand(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
// Locate first character of first argument.
__ add(r0, r0, Operand(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
// r0: first character of first string.
// r1: second string.
// r2: length of first string.
// r3: length of second string.
// r6: first character of result.
// r7: result string.
StringHelper::GenerateCopyCharacters(masm, r6, r0, r2, r4, false);
// Locate first character of second argument.
__ add(r1, r1, Operand(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
// r1: first character of second string.
// r3: length of second string.
// r6: next character of result (after copy of first string).
// r7: result string.
StringHelper::GenerateCopyCharacters(masm, r6, r1, r3, r4, false);
__ mov(r0, Operand(r7));
__ IncrementCounter(counters->string_add_native(), 1, r2, r3);
__ add(sp, sp, Operand(2 * kPointerSize));
__ Ret();
// Just jump to runtime to add the two strings.
__ bind(&string_add_runtime);
__ TailCallRuntime(Runtime::kStringAdd, 2, 1);
if (call_builtin.is_linked()) {
__ bind(&call_builtin);
__ InvokeBuiltin(builtin_id, JUMP_FUNCTION);
}
}
void StringAddStub::GenerateConvertArgument(MacroAssembler* masm,
int stack_offset,
Register arg,
Register scratch1,
Register scratch2,
Register scratch3,
Register scratch4,
Label* slow) {
// First check if the argument is already a string.
Label not_string, done;
__ JumpIfSmi(arg, &not_string);
__ CompareObjectType(arg, scratch1, scratch1, FIRST_NONSTRING_TYPE);
__ b(lt, &done);
// Check the number to string cache.
Label not_cached;
__ bind(&not_string);
// Puts the cached result into scratch1.
NumberToStringStub::GenerateLookupNumberStringCache(masm,
arg,
scratch1,
scratch2,
scratch3,
scratch4,
false,
&not_cached);
__ mov(arg, scratch1);
__ str(arg, MemOperand(sp, stack_offset));
__ jmp(&done);
// Check if the argument is a safe string wrapper.
__ bind(&not_cached);
__ JumpIfSmi(arg, slow);
__ CompareObjectType(
arg, scratch1, scratch2, JS_VALUE_TYPE); // map -> scratch1.
__ b(ne, slow);
__ ldrb(scratch2, FieldMemOperand(scratch1, Map::kBitField2Offset));
__ and_(scratch2,
scratch2, Operand(1 << Map::kStringWrapperSafeForDefaultValueOf));
__ cmp(scratch2,
Operand(1 << Map::kStringWrapperSafeForDefaultValueOf));
__ b(ne, slow);
__ ldr(arg, FieldMemOperand(arg, JSValue::kValueOffset));
__ str(arg, MemOperand(sp, stack_offset));
__ bind(&done);
}
void ICCompareStub::GenerateSmis(MacroAssembler* masm) {
ASSERT(state_ == CompareIC::SMIS);
Label miss;
__ orr(r2, r1, r0);
__ JumpIfNotSmi(r2, &miss);
if (GetCondition() == eq) {
// For equality we do not care about the sign of the result.
__ sub(r0, r0, r1, SetCC);
} else {
// Untag before subtracting to avoid handling overflow.
__ SmiUntag(r1);
__ sub(r0, r1, SmiUntagOperand(r0));
}
__ Ret();
__ bind(&miss);
GenerateMiss(masm);
}
void ICCompareStub::GenerateHeapNumbers(MacroAssembler* masm) {
ASSERT(state_ == CompareIC::HEAP_NUMBERS);
Label generic_stub;
Label unordered;
Label miss;
__ and_(r2, r1, Operand(r0));
__ JumpIfSmi(r2, &generic_stub);
__ CompareObjectType(r0, r2, r2, HEAP_NUMBER_TYPE);
__ b(ne, &miss);
__ CompareObjectType(r1, r2, r2, HEAP_NUMBER_TYPE);
__ b(ne, &miss);
// Inlining the double comparison and falling back to the general compare
// stub if NaN is involved or VFP3 is unsupported.
if (CpuFeatures::IsSupported(VFP3)) {
CpuFeatures::Scope scope(VFP3);
// Load left and right operand
__ sub(r2, r1, Operand(kHeapObjectTag));
__ vldr(d0, r2, HeapNumber::kValueOffset);
__ sub(r2, r0, Operand(kHeapObjectTag));
__ vldr(d1, r2, HeapNumber::kValueOffset);
// Compare operands
__ VFPCompareAndSetFlags(d0, d1);
// Don't base result on status bits when a NaN is involved.
__ b(vs, &unordered);
// Return a result of -1, 0, or 1, based on status bits.
__ mov(r0, Operand(EQUAL), LeaveCC, eq);
__ mov(r0, Operand(LESS), LeaveCC, lt);
__ mov(r0, Operand(GREATER), LeaveCC, gt);
__ Ret();
__ bind(&unordered);
}
CompareStub stub(GetCondition(), strict(), NO_COMPARE_FLAGS, r1, r0);
__ bind(&generic_stub);
__ Jump(stub.GetCode(), RelocInfo::CODE_TARGET);
__ bind(&miss);
GenerateMiss(masm);
}
void ICCompareStub::GenerateSymbols(MacroAssembler* masm) {
ASSERT(state_ == CompareIC::SYMBOLS);
Label miss;
// Registers containing left and right operands respectively.
Register left = r1;
Register right = r0;
Register tmp1 = r2;
Register tmp2 = r3;
// Check that both operands are heap objects.
__ JumpIfEitherSmi(left, right, &miss);
// Check that both operands are symbols.
__ ldr(tmp1, FieldMemOperand(left, HeapObject::kMapOffset));
__ ldr(tmp2, FieldMemOperand(right, HeapObject::kMapOffset));
__ ldrb(tmp1, FieldMemOperand(tmp1, Map::kInstanceTypeOffset));
__ ldrb(tmp2, FieldMemOperand(tmp2, Map::kInstanceTypeOffset));
STATIC_ASSERT(kSymbolTag != 0);
__ and_(tmp1, tmp1, Operand(tmp2));
__ tst(tmp1, Operand(kIsSymbolMask));
__ b(eq, &miss);
// Symbols are compared by identity.
__ cmp(left, right);
// Make sure r0 is non-zero. At this point input operands are
// guaranteed to be non-zero.
ASSERT(right.is(r0));
STATIC_ASSERT(EQUAL == 0);
STATIC_ASSERT(kSmiTag == 0);
__ mov(r0, Operand(Smi::FromInt(EQUAL)), LeaveCC, eq);
__ Ret();
__ bind(&miss);
GenerateMiss(masm);
}
void ICCompareStub::GenerateStrings(MacroAssembler* masm) {
ASSERT(state_ == CompareIC::STRINGS);
Label miss;
// Registers containing left and right operands respectively.
Register left = r1;
Register right = r0;
Register tmp1 = r2;
Register tmp2 = r3;
Register tmp3 = r4;
Register tmp4 = r5;
// Check that both operands are heap objects.
__ JumpIfEitherSmi(left, right, &miss);
// Check that both operands are strings. This leaves the instance
// types loaded in tmp1 and tmp2.
__ ldr(tmp1, FieldMemOperand(left, HeapObject::kMapOffset));
__ ldr(tmp2, FieldMemOperand(right, HeapObject::kMapOffset));
__ ldrb(tmp1, FieldMemOperand(tmp1, Map::kInstanceTypeOffset));
__ ldrb(tmp2, FieldMemOperand(tmp2, Map::kInstanceTypeOffset));
STATIC_ASSERT(kNotStringTag != 0);
__ orr(tmp3, tmp1, tmp2);
__ tst(tmp3, Operand(kIsNotStringMask));
__ b(ne, &miss);
// Fast check for identical strings.
__ cmp(left, right);
STATIC_ASSERT(EQUAL == 0);
STATIC_ASSERT(kSmiTag == 0);
__ mov(r0, Operand(Smi::FromInt(EQUAL)), LeaveCC, eq);
__ Ret(eq);
// Handle not identical strings.
// Check that both strings are symbols. If they are, we're done
// because we already know they are not identical.
ASSERT(GetCondition() == eq);
STATIC_ASSERT(kSymbolTag != 0);
__ and_(tmp3, tmp1, Operand(tmp2));
__ tst(tmp3, Operand(kIsSymbolMask));
// Make sure r0 is non-zero. At this point input operands are
// guaranteed to be non-zero.
ASSERT(right.is(r0));
__ Ret(ne);
// Check that both strings are sequential ASCII.
Label runtime;
__ JumpIfBothInstanceTypesAreNotSequentialAscii(tmp1, tmp2, tmp3, tmp4,
&runtime);
// Compare flat ASCII strings. Returns when done.
StringCompareStub::GenerateFlatAsciiStringEquals(
masm, left, right, tmp1, tmp2, tmp3);
// Handle more complex cases in runtime.
__ bind(&runtime);
__ Push(left, right);
__ TailCallRuntime(Runtime::kStringEquals, 2, 1);
__ bind(&miss);
GenerateMiss(masm);
}
void ICCompareStub::GenerateObjects(MacroAssembler* masm) {
ASSERT(state_ == CompareIC::OBJECTS);
Label miss;
__ and_(r2, r1, Operand(r0));
__ JumpIfSmi(r2, &miss);
__ CompareObjectType(r0, r2, r2, JS_OBJECT_TYPE);
__ b(ne, &miss);
__ CompareObjectType(r1, r2, r2, JS_OBJECT_TYPE);
__ b(ne, &miss);
ASSERT(GetCondition() == eq);
__ sub(r0, r0, Operand(r1));
__ Ret();
__ bind(&miss);
GenerateMiss(masm);
}
void ICCompareStub::GenerateMiss(MacroAssembler* masm) {
__ Push(r1, r0);
__ push(lr);
// Call the runtime system in a fresh internal frame.
ExternalReference miss =
ExternalReference(IC_Utility(IC::kCompareIC_Miss), masm->isolate());
__ EnterInternalFrame();
__ Push(r1, r0);
__ mov(ip, Operand(Smi::FromInt(op_)));
__ push(ip);
__ CallExternalReference(miss, 3);
__ LeaveInternalFrame();
// Compute the entry point of the rewritten stub.
__ add(r2, r0, Operand(Code::kHeaderSize - kHeapObjectTag));
// Restore registers.
__ pop(lr);
__ pop(r0);
__ pop(r1);
__ Jump(r2);
}
void DirectCEntryStub::Generate(MacroAssembler* masm) {
__ ldr(pc, MemOperand(sp, 0));
}
void DirectCEntryStub::GenerateCall(MacroAssembler* masm,
ExternalReference function) {
__ mov(r2, Operand(function));
GenerateCall(masm, r2);
}
void DirectCEntryStub::GenerateCall(MacroAssembler* masm,
Register target) {
__ mov(lr, Operand(reinterpret_cast<intptr_t>(GetCode().location()),
RelocInfo::CODE_TARGET));
// Push return address (accessible to GC through exit frame pc).
// Note that using pc with str is deprecated.
Label start;
__ bind(&start);
__ add(ip, pc, Operand(Assembler::kInstrSize));
__ str(ip, MemOperand(sp, 0));
__ Jump(target); // Call the C++ function.
ASSERT_EQ(Assembler::kInstrSize + Assembler::kPcLoadDelta,
masm->SizeOfCodeGeneratedSince(&start));
}
MaybeObject* StringDictionaryLookupStub::GenerateNegativeLookup(
MacroAssembler* masm,
Label* miss,
Label* done,
Register receiver,
Register properties,
String* name,
Register scratch0) {
// If names of slots in range from 1 to kProbes - 1 for the hash value are
// not equal to the name and kProbes-th slot is not used (its name is the
// undefined value), it guarantees the hash table doesn't contain the
// property. It's true even if some slots represent deleted properties
// (their names are the null value).
for (int i = 0; i < kInlinedProbes; i++) {
// scratch0 points to properties hash.
// Compute the masked index: (hash + i + i * i) & mask.
Register index = scratch0;
// Capacity is smi 2^n.
__ ldr(index, FieldMemOperand(properties, kCapacityOffset));
__ sub(index, index, Operand(1));
__ and_(index, index, Operand(
Smi::FromInt(name->Hash() + StringDictionary::GetProbeOffset(i))));
// Scale the index by multiplying by the entry size.
ASSERT(StringDictionary::kEntrySize == 3);
__ add(index, index, Operand(index, LSL, 1)); // index *= 3.
Register entity_name = scratch0;
// Having undefined at this place means the name is not contained.
ASSERT_EQ(kSmiTagSize, 1);
Register tmp = properties;
__ add(tmp, properties, Operand(index, LSL, 1));
__ ldr(entity_name, FieldMemOperand(tmp, kElementsStartOffset));
ASSERT(!tmp.is(entity_name));
__ LoadRoot(tmp, Heap::kUndefinedValueRootIndex);
__ cmp(entity_name, tmp);
__ b(eq, done);
if (i != kInlinedProbes - 1) {
// Stop if found the property.
__ cmp(entity_name, Operand(Handle<String>(name)));
__ b(eq, miss);
// Check if the entry name is not a symbol.
__ ldr(entity_name, FieldMemOperand(entity_name, HeapObject::kMapOffset));
__ ldrb(entity_name,
FieldMemOperand(entity_name, Map::kInstanceTypeOffset));
__ tst(entity_name, Operand(kIsSymbolMask));
__ b(eq, miss);
// Restore the properties.
__ ldr(properties,
FieldMemOperand(receiver, JSObject::kPropertiesOffset));
}
}
const int spill_mask =
(lr.bit() | r6.bit() | r5.bit() | r4.bit() | r3.bit() |
r2.bit() | r1.bit() | r0.bit());
__ stm(db_w, sp, spill_mask);
__ ldr(r0, FieldMemOperand(receiver, JSObject::kPropertiesOffset));
__ mov(r1, Operand(Handle<String>(name)));
StringDictionaryLookupStub stub(NEGATIVE_LOOKUP);
MaybeObject* result = masm->TryCallStub(&stub);
if (result->IsFailure()) return result;
__ tst(r0, Operand(r0));
__ ldm(ia_w, sp, spill_mask);
__ b(eq, done);
__ b(ne, miss);
return result;
}
// Probe the string dictionary in the |elements| register. Jump to the
// |done| label if a property with the given name is found. Jump to
// the |miss| label otherwise.
// If lookup was successful |scratch2| will be equal to elements + 4 * index.
void StringDictionaryLookupStub::GeneratePositiveLookup(MacroAssembler* masm,
Label* miss,
Label* done,
Register elements,
Register name,
Register scratch1,
Register scratch2) {
// Assert that name contains a string.
if (FLAG_debug_code) __ AbortIfNotString(name);
// Compute the capacity mask.
__ ldr(scratch1, FieldMemOperand(elements, kCapacityOffset));
__ mov(scratch1, Operand(scratch1, ASR, kSmiTagSize)); // convert smi to int
__ sub(scratch1, scratch1, Operand(1));
// Generate an unrolled loop that performs a few probes before
// giving up. Measurements done on Gmail indicate that 2 probes
// cover ~93% of loads from dictionaries.
for (int i = 0; i < kInlinedProbes; i++) {
// Compute the masked index: (hash + i + i * i) & mask.
__ ldr(scratch2, FieldMemOperand(name, String::kHashFieldOffset));
if (i > 0) {
// Add the probe offset (i + i * i) left shifted to avoid right shifting
// the hash in a separate instruction. The value hash + i + i * i is right
// shifted in the following and instruction.
ASSERT(StringDictionary::GetProbeOffset(i) <
1 << (32 - String::kHashFieldOffset));
__ add(scratch2, scratch2, Operand(
StringDictionary::GetProbeOffset(i) << String::kHashShift));
}
__ and_(scratch2, scratch1, Operand(scratch2, LSR, String::kHashShift));
// Scale the index by multiplying by the element size.
ASSERT(StringDictionary::kEntrySize == 3);
// scratch2 = scratch2 * 3.
__ add(scratch2, scratch2, Operand(scratch2, LSL, 1));
// Check if the key is identical to the name.
__ add(scratch2, elements, Operand(scratch2, LSL, 2));
__ ldr(ip, FieldMemOperand(scratch2, kElementsStartOffset));
__ cmp(name, Operand(ip));
__ b(eq, done);
}
const int spill_mask =
(lr.bit() | r6.bit() | r5.bit() | r4.bit() |
r3.bit() | r2.bit() | r1.bit() | r0.bit()) &
~(scratch1.bit() | scratch2.bit());
__ stm(db_w, sp, spill_mask);
__ Move(r0, elements);
__ Move(r1, name);
StringDictionaryLookupStub stub(POSITIVE_LOOKUP);
__ CallStub(&stub);
__ tst(r0, Operand(r0));
__ mov(scratch2, Operand(r2));
__ ldm(ia_w, sp, spill_mask);
__ b(ne, done);
__ b(eq, miss);
}
void StringDictionaryLookupStub::Generate(MacroAssembler* masm) {
// Registers:
// result: StringDictionary to probe
// r1: key
// : StringDictionary to probe.
// index_: will hold an index of entry if lookup is successful.
// might alias with result_.
// Returns:
// result_ is zero if lookup failed, non zero otherwise.
Register result = r0;
Register dictionary = r0;
Register key = r1;
Register index = r2;
Register mask = r3;
Register hash = r4;
Register undefined = r5;
Register entry_key = r6;
Label in_dictionary, maybe_in_dictionary, not_in_dictionary;
__ ldr(mask, FieldMemOperand(dictionary, kCapacityOffset));
__ mov(mask, Operand(mask, ASR, kSmiTagSize));
__ sub(mask, mask, Operand(1));
__ ldr(hash, FieldMemOperand(key, String::kHashFieldOffset));
__ LoadRoot(undefined, Heap::kUndefinedValueRootIndex);
for (int i = kInlinedProbes; i < kTotalProbes; i++) {
// Compute the masked index: (hash + i + i * i) & mask.
// Capacity is smi 2^n.
if (i > 0) {
// Add the probe offset (i + i * i) left shifted to avoid right shifting
// the hash in a separate instruction. The value hash + i + i * i is right
// shifted in the following and instruction.
ASSERT(StringDictionary::GetProbeOffset(i) <
1 << (32 - String::kHashFieldOffset));
__ add(index, hash, Operand(
StringDictionary::GetProbeOffset(i) << String::kHashShift));
} else {
__ mov(index, Operand(hash));
}
__ and_(index, mask, Operand(index, LSR, String::kHashShift));
// Scale the index by multiplying by the entry size.
ASSERT(StringDictionary::kEntrySize == 3);
__ add(index, index, Operand(index, LSL, 1)); // index *= 3.
ASSERT_EQ(kSmiTagSize, 1);
__ add(index, dictionary, Operand(index, LSL, 2));
__ ldr(entry_key, FieldMemOperand(index, kElementsStartOffset));
// Having undefined at this place means the name is not contained.
__ cmp(entry_key, Operand(undefined));
__ b(eq, &not_in_dictionary);
// Stop if found the property.
__ cmp(entry_key, Operand(key));
__ b(eq, &in_dictionary);
if (i != kTotalProbes - 1 && mode_ == NEGATIVE_LOOKUP) {
// Check if the entry name is not a symbol.
__ ldr(entry_key, FieldMemOperand(entry_key, HeapObject::kMapOffset));
__ ldrb(entry_key,
FieldMemOperand(entry_key, Map::kInstanceTypeOffset));
__ tst(entry_key, Operand(kIsSymbolMask));
__ b(eq, &maybe_in_dictionary);
}
}
__ bind(&maybe_in_dictionary);
// If we are doing negative lookup then probing failure should be
// treated as a lookup success. For positive lookup probing failure
// should be treated as lookup failure.
if (mode_ == POSITIVE_LOOKUP) {
__ mov(result, Operand::Zero());
__ Ret();
}
__ bind(&in_dictionary);
__ mov(result, Operand(1));
__ Ret();
__ bind(&not_in_dictionary);
__ mov(result, Operand::Zero());
__ Ret();
}
#undef __
} } // namespace v8::internal
#endif // V8_TARGET_ARCH_ARM