stub-cache-ia32.cc.svn-base

Google浏览器V8内核代码

  // Check that the object isn't a smi.
  __ test(receiver_reg, Immediate(kSmiTagMask));
  __ j(zero, miss_label, not_taken);

  // Check that the map of the object hasn't changed.
  __ cmp(FieldOperand(receiver_reg, HeapObject::kMapOffset),
         Immediate(Handle<Map>(object->map())));
  __ j(not_equal, miss_label, not_taken);

  // Perform global security token check if needed.
  if (object->IsJSGlobalObject()) {
    __ CheckAccessGlobal(receiver_reg, scratch, miss_label);
  }

  // Stub never generated for non-global objects that require access
  // checks.
  ASSERT(object->IsJSGlobalObject() || !object->IsAccessCheckNeeded());

  // Get the properties array (optimistically).
  __ mov(scratch, FieldOperand(receiver_reg, JSObject::kPropertiesOffset));

  // Perform map transition for the receiver if necessary.
  if (transition != NULL) {
    // Update the map of the object; no write barrier updating is
    // needed because the map is never in new space.
    __ mov(FieldOperand(receiver_reg, HeapObject::kMapOffset),
           Immediate(Handle<Map>(transition)));
  }

  // Write to the properties array.
  int offset = index * kPointerSize + Array::kHeaderSize;
  __ mov(FieldOperand(scratch, offset), eax);

  // Update the write barrier for the array address.
  // Pass the value being stored in the now unused name_reg.
  __ mov(name_reg, Operand(eax));
  __ RecordWrite(scratch, offset, name_reg, receiver_reg);

  // Return the value (register eax).
  __ ret(0);
}


#undef __

#define __ masm()->


// TODO(1241006): Avoid having lazy compile stubs specialized by the
// number of arguments. It is not needed anymore.
Object* StubCompiler::CompileLazyCompile(Code::Flags flags) {
  HandleScope scope;

  // Enter an internal frame.
  __ EnterInternalFrame();

  // Push a copy of the function onto the stack.
  __ push(edi);

  __ push(edi);  // function is also the parameter to the runtime call
  __ CallRuntime(Runtime::kLazyCompile, 1);
  __ pop(edi);

  __ LeaveInternalFrame();

  // Do a tail-call of the compiled function.
  __ lea(ecx, FieldOperand(eax, Code::kHeaderSize));
  __ jmp(Operand(ecx));

  return GetCodeWithFlags(flags);
}


Object* CallStubCompiler::CompileCallField(Object* object,
                                           JSObject* holder,
                                           int index) {
  // ----------- S t a t e -------------
  // -----------------------------------

  HandleScope scope;
  Label miss;

  // Get the receiver from the stack.
  const int argc = arguments().immediate();
  __ mov(edx, Operand(esp, (argc + 1) * kPointerSize));

  // Check that the receiver isn't a smi.
  __ test(edx, Immediate(kSmiTagMask));
  __ j(zero, &miss, not_taken);

  // Do the right check and compute the holder register.
  Register reg =
      __ CheckMaps(JSObject::cast(object), edx, holder, ebx, ecx, &miss);

  // Get the properties array of the holder and get the function from the field.
  int offset = index * kPointerSize + Array::kHeaderSize;
  __ mov(edi, FieldOperand(reg, JSObject::kPropertiesOffset));
  __ mov(edi, FieldOperand(edi, offset));

  // Check that the function really is a function.
  __ test(edi, Immediate(kSmiTagMask));
  __ j(zero, &miss, not_taken);
  __ mov(ebx, FieldOperand(edi, HeapObject::kMapOffset));  // get the map
  __ movzx_b(ebx, FieldOperand(ebx, Map::kInstanceTypeOffset));
  __ cmp(ebx, JS_FUNCTION_TYPE);
  __ j(not_equal, &miss, not_taken);

  // Invoke the function.
  __ InvokeFunction(edi, arguments(), JUMP_FUNCTION);

  // Handle call cache miss.
  __ bind(&miss);
  Handle<Code> ic = ComputeCallMiss(arguments().immediate());
  __ jmp(ic, RelocInfo::CODE_TARGET);

  // Return the generated code.
  return GetCode(FIELD);
}


Object* CallStubCompiler::CompileCallConstant(Object* object,
                                              JSObject* holder,
                                              JSFunction* function,
                                              CheckType check) {
  // ----------- S t a t e -------------
  // -----------------------------------

  HandleScope scope;
  Label miss;

  // Get the receiver from the stack.
  const int argc = arguments().immediate();
  __ mov(edx, Operand(esp, (argc + 1) * kPointerSize));

  // Check that the receiver isn't a smi.
  if (check != NUMBER_CHECK) {
    __ test(edx, Immediate(kSmiTagMask));
    __ j(zero, &miss, not_taken);
  }

  switch (check) {
    case RECEIVER_MAP_CHECK:
      // Check that the maps haven't changed.
      __ CheckMaps(JSObject::cast(object), edx, holder, ebx, ecx, &miss);
      break;

    case STRING_CHECK:
      // Check that the object is a two-byte string or a symbol.
      __ mov(ecx, FieldOperand(edx, HeapObject::kMapOffset));
      __ movzx_b(ecx, FieldOperand(ecx, Map::kInstanceTypeOffset));
      __ cmp(ecx, FIRST_NONSTRING_TYPE);
      __ j(above_equal, &miss, not_taken);
      // Check that the maps starting from the prototype haven't changed.
      GenerateLoadGlobalFunctionPrototype(masm(),
                                          Context::STRING_FUNCTION_INDEX,
                                          ecx);
      __ CheckMaps(JSObject::cast(object->GetPrototype()),
                   ecx, holder, ebx, edx, &miss);
      break;

    case NUMBER_CHECK: {
      Label fast;
      // Check that the object is a smi or a heap number.
      __ test(edx, Immediate(kSmiTagMask));
      __ j(zero, &fast, taken);
      __ mov(ecx, FieldOperand(edx, HeapObject::kMapOffset));
      __ movzx_b(ecx, FieldOperand(ecx, Map::kInstanceTypeOffset));
      __ cmp(ecx, HEAP_NUMBER_TYPE);
      __ j(not_equal, &miss, not_taken);
      __ bind(&fast);
      // Check that the maps starting from the prototype haven't changed.
      GenerateLoadGlobalFunctionPrototype(masm(),
                                          Context::NUMBER_FUNCTION_INDEX,
                                          ecx);
      __ CheckMaps(JSObject::cast(object->GetPrototype()),
                   ecx, holder, ebx, edx, &miss);
      break;
    }

    case BOOLEAN_CHECK: {
      Label fast;
      // Check that the object is a boolean.
      __ cmp(edx, Factory::true_value());
      __ j(equal, &fast, taken);
      __ cmp(edx, Factory::false_value());
      __ j(not_equal, &miss, not_taken);
      __ bind(&fast);
      // Check that the maps starting from the prototype haven't changed.
      GenerateLoadGlobalFunctionPrototype(masm(),
                                          Context::BOOLEAN_FUNCTION_INDEX,
                                          ecx);
      __ CheckMaps(JSObject::cast(object->GetPrototype()),
                   ecx, holder, ebx, edx, &miss);
      break;
    }

    case JSARRAY_HAS_FAST_ELEMENTS_CHECK:
      __ CheckMaps(JSObject::cast(object), edx, holder, ebx, ecx, &miss);
      // Make sure object->elements()->map() != Heap::dictionary_array_map()
      // Get the elements array of the object.
      __ mov(ebx, FieldOperand(edx, JSObject::kElementsOffset));
      // Check that the object is in fast mode (not dictionary).
      __ cmp(FieldOperand(ebx, HeapObject::kMapOffset),
             Immediate(Factory::hash_table_map()));
      __ j(equal, &miss, not_taken);
      break;

    default:
      UNREACHABLE();
  }

  // Get the function and setup the context.
  __ mov(Operand(edi), Immediate(Handle<JSFunction>(function)));
  __ mov(esi, FieldOperand(edi, JSFunction::kContextOffset));

  // Jump to the cached code (tail call).
  Handle<Code> code(function->code());
  ParameterCount expected(function->shared()->formal_parameter_count());
  __ InvokeCode(code, expected, arguments(),
                RelocInfo::CODE_TARGET, JUMP_FUNCTION);

  // Handle call cache miss.
  __ bind(&miss);
  Handle<Code> ic = ComputeCallMiss(arguments().immediate());
  __ jmp(ic, RelocInfo::CODE_TARGET);

  // Return the generated code.
  return GetCode(CONSTANT_FUNCTION);
}


Object* CallStubCompiler::CompileCallInterceptor(Object* object,
                                                 JSObject* holder,
                                                 String* name) {
  // ----------- S t a t e -------------
  // -----------------------------------

  HandleScope scope;
  Label miss;

  // Get the number of arguments.
  const int argc = arguments().immediate();

  // Get the receiver from the stack.
  __ mov(edx, Operand(esp, (argc + 1) * kPointerSize));
  // Check that the receiver isn't a smi.
  __ test(edx, Immediate(kSmiTagMask));
  __ j(zero, &miss, not_taken);

  // Check that maps have not changed and compute the holder register.
  Register reg =
      __ CheckMaps(JSObject::cast(object), edx, holder, ebx, ecx, &miss);

  // Enter an internal frame.
  __ EnterInternalFrame();

  // Push arguments on the expression stack.
  __ push(edx);  // receiver
  __ push(reg);  // holder
  __ push(Operand(ebp, (argc + 3) * kPointerSize));  // name

  // Perform call.
  ExternalReference load_interceptor =
      ExternalReference(IC_Utility(IC::kLoadInterceptorProperty));
  __ mov(Operand(eax), Immediate(3));
  __ mov(Operand(ebx), Immediate(load_interceptor));

  CEntryStub stub;
  __ CallStub(&stub);

  // Move result to edi and restore receiver.
  __ mov(Operand(edi), eax);
  __ mov(edx, Operand(ebp, (argc + 2) * kPointerSize));  // receiver

  // Exit frame.
  __ LeaveInternalFrame();

  // Check that the function really is a function.
  __ test(edi, Immediate(kSmiTagMask));
  __ j(zero, &miss, not_taken);
  __ mov(ebx, FieldOperand(edi, HeapObject::kMapOffset));
  __ movzx_b(ebx, FieldOperand(ebx, Map::kInstanceTypeOffset));
  __ cmp(ebx, JS_FUNCTION_TYPE);
  __ j(not_equal, &miss, not_taken);

  // Invoke the function.
  __ InvokeFunction(edi, arguments(), JUMP_FUNCTION);

  // Handle load cache miss.
  __ bind(&miss);
  Handle<Code> ic = ComputeCallMiss(argc);
  __ jmp(ic, RelocInfo::CODE_TARGET);

  // Return the generated code.
  return GetCode(INTERCEPTOR);
}


Object* StoreStubCompiler::CompileStoreField(JSObject* object,
                                             int index,
                                             Map* transition,
                                             String* name) {
  // ----------- S t a t e -------------
  //  -- eax    : value
  //  -- ecx    : name
  //  -- esp[0] : return address
  //  -- esp[4] : receiver
  // -----------------------------------

  HandleScope scope;
  Label miss;

  // Get the object from the stack.
  __ mov(ebx, Operand(esp, 1 * kPointerSize));

  // Generate store field code.  Trashes the name register.
  GenerateStoreField(masm(), object, index, transition, ebx, ecx, edx, &miss);

  // Handle store cache miss.
  __ bind(&miss);
  __ mov(Operand(ecx), Immediate(Handle<String>(name)));  // restore name
  Handle<Code> ic(Builtins::builtin(Builtins::StoreIC_Miss));
  __ jmp(ic, RelocInfo::CODE_TARGET);

  // Return the generated code.
  return GetCode(transition == NULL ? FIELD : MAP_TRANSITION);
}


Object* StoreStubCompiler::CompileStoreCallback(JSObject* object,
                                                AccessorInfo* callback,
                                                String* name) {
  // ----------- S t a t e -------------
  //  -- eax    : value
  //  -- ecx    : name
  //  -- esp[0] : return address
  //  -- esp[4] : receiver
  // -----------------------------------

  HandleScope scope;
  Label miss;

  // Get the object from the stack.
  __ mov(ebx, Operand(esp, 1 * kPointerSize));

  // Check that the object isn't a smi.
  __ test(ebx, Immediate(kSmiTagMask));
  __ j(zero, &miss, not_taken);

  // Check that the map of the object hasn't changed.
  __ cmp(FieldOperand(ebx, HeapObject::kMapOffset),
         Immediate(Handle<Map>(object->map())));
  __ j(not_equal, &miss, not_taken);

  // Perform global security token check if needed.
  if (object->IsJSGlobalObject()) {
    __ CheckAccessGlobal(ebx, edx, &miss);
  }

  // Stub never generated for non-global objects that require access
  // checks.
  ASSERT(object->IsJSGlobalObject() || !object->IsAccessCheckNeeded());

  __ pop(ebx);  // remove the return address
  __ push(Operand(esp, 0));  // receiver
  __ push(Immediate(Handle<AccessorInfo>(callback)));  // callback info
  __ push(ecx);  // name
  __ push(eax);  // value
  __ push(ebx);  // restore return address

  // Do tail-call to the runtime system.
  ExternalReference store_callback_property =
      ExternalReference(IC_Utility(IC::kStoreCallbackProperty));
  __ TailCallRuntime(store_callback_property, 4);

  // Handle store cache miss.
  __ bind(&miss);
  __ mov(Operand(ecx), Immediate(Handle<String>(name)));  // restore name
  Handle<Code> ic(Builtins::builtin(Builtins::StoreIC_Miss));
  __ jmp(ic, RelocInfo::CODE_TARGET);

  // Return the generated code.
  return GetCode(CALLBACKS);
}


Object* StoreStubCompiler::CompileStoreInterceptor(JSObject* receiver,
                                                   String* name) {
  // ----------- S t a t e -------------
  //  -- eax    : value
  //  -- ecx    : name
  //  -- esp[0] : return address
  //  -- esp[4] : receiver
  // -----------------------------------

  HandleScope scope;
  Label miss;

  // Get the object from the stack.
  __ mov(ebx, Operand(esp, 1 * kPointerSize));

  // Check that the object isn't a smi.
  __ test(ebx, Immediate(kSmiTagMask));
  __ j(zero, &miss, not_taken);

  // Check that the map of the object hasn't changed.
  __ cmp(FieldOperand(ebx, HeapObject::kMapOffset),
         Immediate(Handle<Map>(receiver->map())));
  __ j(not_equal, &miss, not_taken);

  // Perform global security token check if needed.
  if (receiver->IsJSGlobalObject()) {
    __ CheckAccessGlobal(ebx, edx, &miss);
  }