[Interpreter] Support for operator new.

src/x64/builtins-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/code-factory.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 767 matching lines @@
   // Drop receiver + arguments and return.
   __ movl(rbx, FieldOperand(kInterpreterBytecodeArrayRegister,
                             BytecodeArray::kParameterSizeOffset));
   __ PopReturnAddressTo(rcx);
   __ addp(rsp, rbx);
   __ PushReturnAddressFrom(rcx);
   __ ret(0);
 }
 
 
-// static
-void Builtins::Generate_InterpreterPushArgsAndCall(MacroAssembler* masm) {
+static void Generate_InterpreterPushArgs(MacroAssembler* masm,

[Benedikt Meurer, 2015/10/14 03:44:25]

Don't use static, but put the helper in an anonymous namespace instead.

[oth, 2015/10/14 08:40:09]

We can do this though want to clarify how far to push. The use of static here
has followed the convention for helper methods in this file. Do we (a) leave
as-is for consistency, (b) move all static methods to an anonymous namespace, or
(c) just do this one?

+                                         bool push_receiver) {
   // ----------- S t a t e -------------
   //  -- rax : the number of arguments (not including the receiver)
   //  -- rbx : the address of the first argument to be pushed. Subsequent
   //           arguments should be consecutive above this, in the same order as
   //           they are to be pushed onto the stack.
-  //  -- rdi : the target to call (can be any Object).
-
-  // Pop return address to allow tail-call after pushing arguments.
-  __ Pop(rdx);
+  // -----------------------------------
 
   // Find the address of the last argument.
   __ movp(rcx, rax);
-  __ addp(rcx, Immediate(1));  // Add one for receiver.
+  if (push_receiver) {
+    __ addp(rcx, Immediate(1));  // Add one for receiver.
+  }
+
   __ shlp(rcx, Immediate(kPointerSizeLog2));
   __ negp(rcx);
   __ addp(rcx, rbx);
 
   // Push the arguments.
   Label loop_header, loop_check;
   __ j(always, &loop_check);
   __ bind(&loop_header);
   __ Push(Operand(rbx, 0));
   __ subp(rbx, Immediate(kPointerSize));
   __ bind(&loop_check);
   __ cmpp(rbx, rcx);
   __ j(greater, &loop_header, Label::kNear);
+}
+
+
+// static
+void Builtins::Generate_InterpreterPushArgsAndCall(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- rax : the number of arguments (not including the receiver)
+  //  -- rbx : the address of the first argument to be pushed. Subsequent
+  //           arguments should be consecutive above this, in the same order as
+  //           they are to be pushed onto the stack.
+  //  -- rdi : the target to call (can be any Object).
+  // -----------------------------------
+
+  // Pop return address to allow tail-call after pushing arguments.
+  __ PopReturnAddressTo(kScratchRegister);
+
+  Generate_InterpreterPushArgs(masm, true);
 
   // Call the target.
-  __ Push(rdx);  // Re-push return address.
+  __ PushReturnAddressFrom(kScratchRegister);  // Re-push return address.
   __ Jump(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
 }
 
 
+// static
+void Builtins::Generate_InterpreterPushArgsAndConstruct(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- rax : the number of arguments (not including the receiver)
+  //  -- rdx : the original constructor (either the same as the constructor or
+  //           the JSFunction on which new was invoked initially)
+  //  -- rdi : the constructor to call (can be any Object)
+  //  -- rbx : the address of the first argument to be pushed. Subsequent
+  //           arguments should be consecutive above this, in the same order as
+  //           they are to be pushed onto the stack.
+  // -----------------------------------
+
+  // Pop return address to allow tail-call after pushing arguments.
+  __ PopReturnAddressTo(kScratchRegister);
+
+  // Push required padding.
+  __ Push(Immediate(0));
+
+  Generate_InterpreterPushArgs(masm, false);
+
+  // Push return address in preparation for the tail-call.
+  __ PushReturnAddressFrom(kScratchRegister);
+
+  // Call the constructor (rax, rdx, rdi passed on).
+  __ Jump(masm->isolate()->builtins()->Construct(), RelocInfo::CONSTRUCT_CALL);
+}
+
+
 void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
   CallRuntimePassFunction(masm, Runtime::kCompileLazy);
   GenerateTailCallToReturnedCode(masm);
 }
 
 
 static void CallCompileOptimized(MacroAssembler* masm,
                                             bool concurrent) {
   FrameScope scope(masm, StackFrame::INTERNAL);
   // Push a copy of the function onto the stack.
@@ skipping 1100 matching lines @@
   __ ret(0);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64