src/x64/fast-codegen-x64.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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//       notice, this list of conditions and the following disclaimer.
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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();
  __ movq(reg, Operand(rbp, index * kPointerSize));
}


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

  EmitLoadReceiver(rdx);
  __ JumpIfSmi(rdx, bailout());

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


void FastCodeGenerator::EmitGlobalVariableLoad(Handle<String> name) {
  // Compile global variable accesses as load IC calls.  The only live
  // registers are rsi (context) and possibly rdx (this).  Both are also
  // saved in the stack and rsi is preserved by the call.
  __ push(CodeGenerator::GlobalObject());
  __ Move(rcx, name);
  Handle<Code> ic(Builtins::builtin(Builtins::LoadIC_Initialize));
  __ Call(ic, RelocInfo::CODE_TARGET_CONTEXT);
  if (has_this_properties()) {
    // Restore this.
    EmitLoadReceiver(rdx);
  } else {
    __ nop();  // Not test rax, 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();
    __ movq(rcx, rdx);  // Copy receiver for write barrier.
  } else {
    offset += FixedArray::kHeaderSize;
    __ movq(rcx, FieldOperand(rdx, JSObject::kPropertiesOffset));
  }
  // Perform the store.
  __ movq(FieldOperand(rcx, offset), rax);
  // Preserve value from write barrier in case it's needed.
  __ movq(rbx, rax);
  __ RecordWrite(rcx, offset, rbx, rdi);
}


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(rbp);
  __ movq(rbp, rsp);
  __ push(rsi);  // Context.
  __ push(rdi);  // Closure.
  // Note that we keep a live register reference to esi (context) at this
  // point.

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

  VisitStatements(fun->body());

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

  Comment epilogue_cmnt(masm(), ";; Epilogue");
  __ movq(rsp, rbp);
  __ pop(rbp);
  __ ret((fun->scope()->num_parameters() + 1) * kPointerSize);

  __ bind(&bailout_);
}


#undef __


} }  // namespace v8::internal