src/arm/fast-codegen-arm.cc

// Copyright 2010 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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#include "v8.h"

#include "codegen-inl.h"
#include "fast-codegen.h"

namespace v8 {
namespace internal {

#define __ ACCESS_MASM(masm())

void FastCodeGenerator::EmitLoadReceiver(Register reg) {
  // Offset 2 is due to return address and saved frame pointer.
  int index = 2 + scope()->num_parameters();
  __ ldr(reg, MemOperand(sp, index * kPointerSize));
}


void FastCodeGenerator::EmitReceiverMapCheck() {
  Comment cmnt(masm(), ";; MapCheck(this)");
  if (FLAG_print_ir) {
    PrintF("MapCheck(this)\n");
  }

  ASSERT(info()->has_receiver() && info()->receiver()->IsHeapObject());
  Handle<HeapObject> object = Handle<HeapObject>::cast(info()->receiver());
  Handle<Map> map(object->map());

  EmitLoadReceiver(r1);
  __ CheckMap(r1, r3, map, bailout(), false);
}


void FastCodeGenerator::EmitGlobalMapCheck() {
  Comment cmnt(masm(), ";; GlobalMapCheck");
  if (FLAG_print_ir) {
    PrintF(";; GlobalMapCheck()");
  }

  ASSERT(info()->has_global_object());
  Handle<Map> map(info()->global_object()->map());

  __ ldr(r3, CodeGenerator::GlobalObject());
  __ CheckMap(r3, r3, map, bailout(), true);
}


void FastCodeGenerator::EmitGlobalVariableLoad(Handle<Object> cell) {
  ASSERT(cell->IsJSGlobalPropertyCell());
  __ mov(r0, Operand(cell));
  __ ldr(r0, FieldMemOperand(r0, JSGlobalPropertyCell::kValueOffset));
  if (FLAG_debug_code) {
    __ mov(ip, Operand(Factory::the_hole_value()));
    __ cmp(r0, ip);
    __ Check(ne, "DontDelete cells can't contain the hole");
  }
}


void FastCodeGenerator::EmitThisPropertyStore(Handle<String> name) {
  LookupResult lookup;
  info()->receiver()->Lookup(*name, &lookup);

  ASSERT(lookup.holder() == *info()->receiver());
  ASSERT(lookup.type() == FIELD);
  Handle<Map> map(Handle<HeapObject>::cast(info()->receiver())->map());
  int index = lookup.GetFieldIndex() - map->inobject_properties();
  int offset = index * kPointerSize;

  // Negative offsets are inobject properties.
  if (offset < 0) {
    offset += map->instance_size();
    __ mov(r2, r1);  // Copy receiver for write barrier.
  } else {
    offset += FixedArray::kHeaderSize;
    __ ldr(r2, FieldMemOperand(r1, JSObject::kPropertiesOffset));
  }
  // Perform the store.
  __ str(r0, FieldMemOperand(r2, offset));
  __ mov(r3, Operand(offset));
  __ RecordWrite(r2, r3, ip);
}


void FastCodeGenerator::Generate(CompilationInfo* compilation_info) {
  ASSERT(info_ == NULL);
  info_ = compilation_info;

  // Save the caller's frame pointer and set up our own.
  Comment prologue_cmnt(masm(), ";; Prologue");
  __ stm(db_w, sp, r1.bit() | cp.bit() | fp.bit() | lr.bit());
  __ add(fp, sp, Operand(2 * kPointerSize));
  // Note that we keep a live register reference to cp (context) at
  // this point.

  // Receiver (this) is allocated to r1 if there are this properties.
  if (info()->has_this_properties()) EmitReceiverMapCheck();

  // If there is a global variable access check if the global object
  // is the same as at lazy-compilation time.
  if (info()->has_globals()) EmitGlobalMapCheck();

  VisitStatements(function()->body());

  Comment return_cmnt(masm(), ";; Return(<undefined>)");
  __ LoadRoot(r0, Heap::kUndefinedValueRootIndex);

  Comment epilogue_cmnt(masm(), ";; Epilogue");
  __ mov(sp, fp);
  __ ldm(ia_w, sp, fp.bit() | lr.bit());
  int32_t sp_delta = (scope()->num_parameters() + 1) * kPointerSize;
  __ add(sp, sp, Operand(sp_delta));
  __ Jump(lr);

  __ bind(&bailout_);
}


#undef __


} }  // namespace v8::internal