| // Copyright 2006-2009 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. |
| |
| #ifndef V8_IA32_MACRO_ASSEMBLER_IA32_H_ |
| #define V8_IA32_MACRO_ASSEMBLER_IA32_H_ |
| |
| #include "assembler.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| // Convenience for platform-independent signatures. We do not normally |
| // distinguish memory operands from other operands on ia32. |
| typedef Operand MemOperand; |
| |
| // Forward declaration. |
| class JumpTarget; |
| |
| // MacroAssembler implements a collection of frequently used macros. |
| class MacroAssembler: public Assembler { |
| public: |
| MacroAssembler(void* buffer, int size); |
| |
| // --------------------------------------------------------------------------- |
| // GC Support |
| |
| // Set the remembered set bit for [object+offset]. |
| // object is the object being stored into, value is the object being stored. |
| // If offset is zero, then the scratch register contains the array index into |
| // the elements array represented as a Smi. |
| // All registers are clobbered by the operation. |
| void RecordWrite(Register object, |
| int offset, |
| Register value, |
| Register scratch); |
| |
| #ifdef ENABLE_DEBUGGER_SUPPORT |
| // --------------------------------------------------------------------------- |
| // Debugger Support |
| |
| void SaveRegistersToMemory(RegList regs); |
| void RestoreRegistersFromMemory(RegList regs); |
| void PushRegistersFromMemory(RegList regs); |
| void PopRegistersToMemory(RegList regs); |
| void CopyRegistersFromStackToMemory(Register base, |
| Register scratch, |
| RegList regs); |
| #endif |
| |
| // --------------------------------------------------------------------------- |
| // Stack limit support |
| |
| // Do simple test for stack overflow. This doesn't handle an overflow. |
| void StackLimitCheck(Label* on_stack_limit_hit); |
| |
| // --------------------------------------------------------------------------- |
| // Activation frames |
| |
| void EnterInternalFrame() { EnterFrame(StackFrame::INTERNAL); } |
| void LeaveInternalFrame() { LeaveFrame(StackFrame::INTERNAL); } |
| |
| void EnterConstructFrame() { EnterFrame(StackFrame::CONSTRUCT); } |
| void LeaveConstructFrame() { LeaveFrame(StackFrame::CONSTRUCT); } |
| |
| // Enter specific kind of exit frame; either in normal or debug mode. |
| // Expects the number of arguments in register eax and |
| // sets up the number of arguments in register edi and the pointer |
| // to the first argument in register esi. |
| void EnterExitFrame(ExitFrame::Mode mode); |
| |
| void EnterApiExitFrame(ExitFrame::Mode mode, int stack_space, int argc); |
| |
| // Leave the current exit frame. Expects the return value in |
| // register eax:edx (untouched) and the pointer to the first |
| // argument in register esi. |
| void LeaveExitFrame(ExitFrame::Mode mode); |
| |
| // Find the function context up the context chain. |
| void LoadContext(Register dst, int context_chain_length); |
| |
| // --------------------------------------------------------------------------- |
| // JavaScript invokes |
| |
| // Invoke the JavaScript function code by either calling or jumping. |
| void InvokeCode(const Operand& code, |
| const ParameterCount& expected, |
| const ParameterCount& actual, |
| InvokeFlag flag); |
| |
| void InvokeCode(Handle<Code> code, |
| const ParameterCount& expected, |
| const ParameterCount& actual, |
| RelocInfo::Mode rmode, |
| InvokeFlag flag); |
| |
| // Invoke the JavaScript function in the given register. Changes the |
| // current context to the context in the function before invoking. |
| void InvokeFunction(Register function, |
| const ParameterCount& actual, |
| InvokeFlag flag); |
| |
| // Invoke specified builtin JavaScript function. Adds an entry to |
| // the unresolved list if the name does not resolve. |
| void InvokeBuiltin(Builtins::JavaScript id, InvokeFlag flag); |
| |
| // Store the code object for the given builtin in the target register. |
| void GetBuiltinEntry(Register target, Builtins::JavaScript id); |
| |
| // Expression support |
| void Set(Register dst, const Immediate& x); |
| void Set(const Operand& dst, const Immediate& x); |
| |
| // Compare object type for heap object. |
| // Incoming register is heap_object and outgoing register is map. |
| void CmpObjectType(Register heap_object, InstanceType type, Register map); |
| |
| // Compare instance type for map. |
| void CmpInstanceType(Register map, InstanceType type); |
| |
| // Check if the map of an object is equal to a specified map and |
| // branch to label if not. Skip the smi check if not required |
| // (object is known to be a heap object) |
| void CheckMap(Register obj, |
| Handle<Map> map, |
| Label* fail, |
| bool is_heap_object); |
| |
| // Check if the object in register heap_object is a string. Afterwards the |
| // register map contains the object map and the register instance_type |
| // contains the instance_type. The registers map and instance_type can be the |
| // same in which case it contains the instance type afterwards. Either of the |
| // registers map and instance_type can be the same as heap_object. |
| Condition IsObjectStringType(Register heap_object, |
| Register map, |
| Register instance_type); |
| |
| // FCmp is similar to integer cmp, but requires unsigned |
| // jcc instructions (je, ja, jae, jb, jbe, je, and jz). |
| void FCmp(); |
| |
| // Smi tagging support. |
| void SmiTag(Register reg) { |
| ASSERT(kSmiTag == 0); |
| shl(reg, kSmiTagSize); |
| } |
| void SmiUntag(Register reg) { |
| sar(reg, kSmiTagSize); |
| } |
| |
| // --------------------------------------------------------------------------- |
| // Exception handling |
| |
| // Push a new try handler and link into try handler chain. The return |
| // address must be pushed before calling this helper. |
| void PushTryHandler(CodeLocation try_location, HandlerType type); |
| |
| // Unlink the stack handler on top of the stack from the try handler chain. |
| void PopTryHandler(); |
| |
| // --------------------------------------------------------------------------- |
| // Inline caching support |
| |
| // Generates code that verifies that the maps of objects in the |
| // prototype chain of object hasn't changed since the code was |
| // generated and branches to the miss label if any map has. If |
| // necessary the function also generates code for security check |
| // in case of global object holders. The scratch and holder |
| // registers are always clobbered, but the object register is only |
| // clobbered if it the same as the holder register. The function |
| // returns a register containing the holder - either object_reg or |
| // holder_reg. |
| Register CheckMaps(JSObject* object, Register object_reg, |
| JSObject* holder, Register holder_reg, |
| Register scratch, Label* miss); |
| |
| // Generate code for checking access rights - used for security checks |
| // on access to global objects across environments. The holder register |
| // is left untouched, but the scratch register is clobbered. |
| void CheckAccessGlobalProxy(Register holder_reg, |
| Register scratch, |
| Label* miss); |
| |
| |
| // --------------------------------------------------------------------------- |
| // Allocation support |
| |
| // Allocate an object in new space. If the new space is exhausted control |
| // continues at the gc_required label. The allocated object is returned in |
| // result and end of the new object is returned in result_end. The register |
| // scratch can be passed as no_reg in which case an additional object |
| // reference will be added to the reloc info. The returned pointers in result |
| // and result_end have not yet been tagged as heap objects. If |
| // result_contains_top_on_entry is true the content of result is known to be |
| // the allocation top on entry (could be result_end from a previous call to |
| // AllocateInNewSpace). If result_contains_top_on_entry is true scratch |
| // should be no_reg as it is never used. |
| void AllocateInNewSpace(int object_size, |
| Register result, |
| Register result_end, |
| Register scratch, |
| Label* gc_required, |
| AllocationFlags flags); |
| |
| void AllocateInNewSpace(int header_size, |
| ScaleFactor element_size, |
| Register element_count, |
| Register result, |
| Register result_end, |
| Register scratch, |
| Label* gc_required, |
| AllocationFlags flags); |
| |
| void AllocateInNewSpace(Register object_size, |
| Register result, |
| Register result_end, |
| Register scratch, |
| Label* gc_required, |
| AllocationFlags flags); |
| |
| // Undo allocation in new space. The object passed and objects allocated after |
| // it will no longer be allocated. Make sure that no pointers are left to the |
| // object(s) no longer allocated as they would be invalid when allocation is |
| // un-done. |
| void UndoAllocationInNewSpace(Register object); |
| |
| // Allocate a heap number in new space with undefined value. The |
| // register scratch2 can be passed as no_reg; the others must be |
| // valid registers. Returns tagged pointer in result register, or |
| // jumps to gc_required if new space is full. |
| void AllocateHeapNumber(Register result, |
| Register scratch1, |
| Register scratch2, |
| Label* gc_required); |
| |
| // Allocate a sequential string. All the header fields of the string object |
| // are initialized. |
| void AllocateTwoByteString(Register result, |
| Register length, |
| Register scratch1, |
| Register scratch2, |
| Register scratch3, |
| Label* gc_required); |
| void AllocateAsciiString(Register result, |
| Register length, |
| Register scratch1, |
| Register scratch2, |
| Register scratch3, |
| Label* gc_required); |
| |
| // Allocate a raw cons string object. Only the map field of the result is |
| // initialized. |
| void AllocateConsString(Register result, |
| Register scratch1, |
| Register scratch2, |
| Label* gc_required); |
| void AllocateAsciiConsString(Register result, |
| Register scratch1, |
| Register scratch2, |
| Label* gc_required); |
| |
| // --------------------------------------------------------------------------- |
| // Support functions. |
| |
| // Check if result is zero and op is negative. |
| void NegativeZeroTest(Register result, Register op, Label* then_label); |
| |
| // Check if result is zero and op is negative in code using jump targets. |
| void NegativeZeroTest(CodeGenerator* cgen, |
| Register result, |
| Register op, |
| JumpTarget* then_target); |
| |
| // Check if result is zero and any of op1 and op2 are negative. |
| // Register scratch is destroyed, and it must be different from op2. |
| void NegativeZeroTest(Register result, Register op1, Register op2, |
| Register scratch, Label* then_label); |
| |
| // Try to get function prototype of a function and puts the value in |
| // the result register. Checks that the function really is a |
| // function and jumps to the miss label if the fast checks fail. The |
| // function register will be untouched; the other registers may be |
| // clobbered. |
| void TryGetFunctionPrototype(Register function, |
| Register result, |
| Register scratch, |
| Label* miss); |
| |
| // Generates code for reporting that an illegal operation has |
| // occurred. |
| void IllegalOperation(int num_arguments); |
| |
| // --------------------------------------------------------------------------- |
| // Runtime calls |
| |
| // Call a code stub. Generate the code if necessary. |
| void CallStub(CodeStub* stub); |
| |
| // Call a code stub and return the code object called. Try to generate |
| // the code if necessary. Do not perform a GC but instead return a retry |
| // after GC failure. |
| Object* TryCallStub(CodeStub* stub); |
| |
| // Tail call a code stub (jump). Generate the code if necessary. |
| void TailCallStub(CodeStub* stub); |
| |
| // Tail call a code stub (jump) and return the code object called. Try to |
| // generate the code if necessary. Do not perform a GC but instead return |
| // a retry after GC failure. |
| Object* TryTailCallStub(CodeStub* stub); |
| |
| // Return from a code stub after popping its arguments. |
| void StubReturn(int argc); |
| |
| // Call a runtime routine. |
| // Eventually this should be used for all C calls. |
| void CallRuntime(Runtime::Function* f, int num_arguments); |
| |
| // Call a runtime function, returning the CodeStub object called. |
| // Try to generate the stub code if necessary. Do not perform a GC |
| // but instead return a retry after GC failure. |
| Object* TryCallRuntime(Runtime::Function* f, int num_arguments); |
| |
| // Convenience function: Same as above, but takes the fid instead. |
| void CallRuntime(Runtime::FunctionId id, int num_arguments); |
| |
| // Convenience function: Same as above, but takes the fid instead. |
| Object* TryCallRuntime(Runtime::FunctionId id, int num_arguments); |
| |
| // Tail call of a runtime routine (jump). |
| // Like JumpToRuntime, but also takes care of passing the number |
| // of arguments. |
| void TailCallRuntime(const ExternalReference& ext, |
| int num_arguments, |
| int result_size); |
| |
| void PushHandleScope(Register scratch); |
| |
| // Pops a handle scope using the specified scratch register and |
| // ensuring that saved register, it is not no_reg, is left unchanged. |
| void PopHandleScope(Register saved, Register scratch); |
| |
| // As PopHandleScope, but does not perform a GC. Instead, returns a |
| // retry after GC failure object if GC is necessary. |
| Object* TryPopHandleScope(Register saved, Register scratch); |
| |
| // Jump to a runtime routine. |
| void JumpToRuntime(const ExternalReference& ext); |
| |
| |
| // --------------------------------------------------------------------------- |
| // Utilities |
| |
| void Ret(); |
| |
| // Emit code to discard a non-negative number of pointer-sized elements |
| // from the stack, clobbering only the esp register. |
| void Drop(int element_count); |
| |
| void Call(Label* target) { call(target); } |
| |
| void Move(Register target, Handle<Object> value); |
| |
| struct Unresolved { |
| int pc; |
| uint32_t flags; // see Bootstrapper::FixupFlags decoders/encoders. |
| const char* name; |
| }; |
| List<Unresolved>* unresolved() { return &unresolved_; } |
| |
| Handle<Object> CodeObject() { return code_object_; } |
| |
| |
| // --------------------------------------------------------------------------- |
| // StatsCounter support |
| |
| void SetCounter(StatsCounter* counter, int value); |
| void IncrementCounter(StatsCounter* counter, int value); |
| void DecrementCounter(StatsCounter* counter, int value); |
| void IncrementCounter(Condition cc, StatsCounter* counter, int value); |
| void DecrementCounter(Condition cc, StatsCounter* counter, int value); |
| |
| |
| // --------------------------------------------------------------------------- |
| // Debugging |
| |
| // Calls Abort(msg) if the condition cc is not satisfied. |
| // Use --debug_code to enable. |
| void Assert(Condition cc, const char* msg); |
| |
| // Like Assert(), but always enabled. |
| void Check(Condition cc, const char* msg); |
| |
| // Print a message to stdout and abort execution. |
| void Abort(const char* msg); |
| |
| // Verify restrictions about code generated in stubs. |
| void set_generating_stub(bool value) { generating_stub_ = value; } |
| bool generating_stub() { return generating_stub_; } |
| void set_allow_stub_calls(bool value) { allow_stub_calls_ = value; } |
| bool allow_stub_calls() { return allow_stub_calls_; } |
| |
| // --------------------------------------------------------------------------- |
| // String utilities. |
| |
| // Checks if both objects are sequential ASCII strings, and jumps to label |
| // if either is not. |
| void JumpIfNotBothSequentialAsciiStrings(Register object1, |
| Register object2, |
| Register scratch1, |
| Register scratch2, |
| Label *on_not_flat_ascii_strings); |
| |
| private: |
| List<Unresolved> unresolved_; |
| bool generating_stub_; |
| bool allow_stub_calls_; |
| // This handle will be patched with the code object on installation. |
| Handle<Object> code_object_; |
| |
| // Helper functions for generating invokes. |
| void InvokePrologue(const ParameterCount& expected, |
| const ParameterCount& actual, |
| Handle<Code> code_constant, |
| const Operand& code_operand, |
| Label* done, |
| InvokeFlag flag); |
| |
| // Prepares for a call or jump to a builtin by doing two things: |
| // 1. Emits code that fetches the builtin's function object from the context |
| // at runtime, and puts it in the register rdi. |
| // 2. Fetches the builtin's code object, and returns it in a handle, at |
| // compile time, so that later code can emit instructions to jump or call |
| // the builtin directly. If the code object has not yet been created, it |
| // returns the builtin code object for IllegalFunction, and sets the |
| // output parameter "resolved" to false. Code that uses the return value |
| // should then add the address and the builtin name to the list of fixups |
| // called unresolved_, which is fixed up by the bootstrapper. |
| Handle<Code> ResolveBuiltin(Builtins::JavaScript id, bool* resolved); |
| |
| // Activation support. |
| void EnterFrame(StackFrame::Type type); |
| void LeaveFrame(StackFrame::Type type); |
| |
| void EnterExitFramePrologue(ExitFrame::Mode mode); |
| void EnterExitFrameEpilogue(ExitFrame::Mode mode, int argc); |
| |
| // Allocation support helpers. |
| void LoadAllocationTopHelper(Register result, |
| Register result_end, |
| Register scratch, |
| AllocationFlags flags); |
| void UpdateAllocationTopHelper(Register result_end, Register scratch); |
| |
| // Helper for PopHandleScope. Allowed to perform a GC and returns |
| // NULL if gc_allowed. Does not perform a GC if !gc_allowed, and |
| // possibly returns a failure object indicating an allocation failure. |
| Object* PopHandleScopeHelper(Register saved, |
| Register scratch, |
| bool gc_allowed); |
| }; |
| |
| |
| // The code patcher is used to patch (typically) small parts of code e.g. for |
| // debugging and other types of instrumentation. When using the code patcher |
| // the exact number of bytes specified must be emitted. Is not legal to emit |
| // relocation information. If any of these constraints are violated it causes |
| // an assertion. |
| class CodePatcher { |
| public: |
| CodePatcher(byte* address, int size); |
| virtual ~CodePatcher(); |
| |
| // Macro assembler to emit code. |
| MacroAssembler* masm() { return &masm_; } |
| |
| private: |
| byte* address_; // The address of the code being patched. |
| int size_; // Number of bytes of the expected patch size. |
| MacroAssembler masm_; // Macro assembler used to generate the code. |
| }; |
| |
| |
| // ----------------------------------------------------------------------------- |
| // Static helper functions. |
| |
| // Generate an Operand for loading a field from an object. |
| static inline Operand FieldOperand(Register object, int offset) { |
| return Operand(object, offset - kHeapObjectTag); |
| } |
| |
| |
| // Generate an Operand for loading an indexed field from an object. |
| static inline Operand FieldOperand(Register object, |
| Register index, |
| ScaleFactor scale, |
| int offset) { |
| return Operand(object, index, scale, offset - kHeapObjectTag); |
| } |
| |
| |
| #ifdef GENERATED_CODE_COVERAGE |
| extern void LogGeneratedCodeCoverage(const char* file_line); |
| #define CODE_COVERAGE_STRINGIFY(x) #x |
| #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x) |
| #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__) |
| #define ACCESS_MASM(masm) { \ |
| byte* ia32_coverage_function = \ |
| reinterpret_cast<byte*>(FUNCTION_ADDR(LogGeneratedCodeCoverage)); \ |
| masm->pushfd(); \ |
| masm->pushad(); \ |
| masm->push(Immediate(reinterpret_cast<int>(&__FILE_LINE__))); \ |
| masm->call(ia32_coverage_function, RelocInfo::RUNTIME_ENTRY); \ |
| masm->pop(eax); \ |
| masm->popad(); \ |
| masm->popfd(); \ |
| } \ |
| masm-> |
| #else |
| #define ACCESS_MASM(masm) masm-> |
| #endif |
| |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_IA32_MACRO_ASSEMBLER_IA32_H_ |
