src/ia32/fast-codegen-ia32.cc

// Copyright 2010 the V8 project authors. All rights reserved.
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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 + function()->scope()->num_parameters();
  __ mov(reg, Operand(ebp, index * kPointerSize));
}


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

  EmitLoadReceiver(edx);
  __ test(edx, Immediate(kSmiTagMask));
  __ j(zero, bailout());

  ASSERT(has_receiver() && receiver()->IsHeapObject());
  Handle<HeapObject> object = Handle<HeapObject>::cast(receiver());
  Handle<Map> map(object->map());
  __ cmp(FieldOperand(edx, HeapObject::kMapOffset), Immediate(map));
  __ j(not_equal, bailout());
}


void FastCodeGenerator::EmitGlobalVariableLoad(Handle<String> name) {
  // Compile global variable accesses as load IC calls.  The only live
  // registers are esi (context) and possibly edx (this).  Both are also
  // saved in the stack and esi is preserved by the call.
  __ push(CodeGenerator::GlobalObject());
  __ mov(ecx, name);
  Handle<Code> ic(Builtins::builtin(Builtins::LoadIC_Initialize));
  __ call(ic, RelocInfo::CODE_TARGET_CONTEXT);
  if (has_this_properties()) {
    // Restore this.
    EmitLoadReceiver(edx);
  } else {
    __ nop();  // Not test eax, indicates IC has no inlined code at call site.
  }
}


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

  ASSERT(lookup.holder() == *receiver());
  ASSERT(lookup.type() == FIELD);
  Handle<Map> map(Handle<HeapObject>::cast(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(ecx, edx);  // Copy receiver for write barrier.
  } else {
    offset += FixedArray::kHeaderSize;
    __ mov(ecx, FieldOperand(edx, JSObject::kPropertiesOffset));
  }
  // Perform the store.
  __ mov(FieldOperand(ecx, offset), eax);
  // Preserve value from write barrier in case it's needed.
  __ mov(ebx, eax);
  __ RecordWrite(ecx, offset, ebx, edi);
}


void FastCodeGenerator::Generate(FunctionLiteral* fun, CompilationInfo* info) {
  ASSERT(function_ == NULL);
  ASSERT(info_ == NULL);
  function_ = fun;
  info_ = info;

  // Save the caller's frame pointer and set up our own.
  Comment prologue_cmnt(masm(), ";; Prologue");
  __ push(ebp);
  __ mov(ebp, esp);
  __ push(esi);  // Context.
  __ push(edi);  // Closure.
  // Note that we keep a live register reference to esi (context) at this
  // point.

  // Receiver (this) is allocated to edx if there are this properties.
  if (has_this_properties()) EmitReceiverMapCheck();

  VisitStatements(fun->body());

  Comment return_cmnt(masm(), ";; Return(<undefined>)");
  __ mov(eax, Factory::undefined_value());

  Comment epilogue_cmnt(masm(), ";; Epilogue");
  __ mov(esp, ebp);
  __ pop(ebp);
  __ ret((fun->scope()->num_parameters() + 1) * kPointerSize);

  __ bind(&bailout_);
}


#undef __


} }  // namespace v8::internal