[Interpreter] Add support for JS calls.

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 1748 matching lines @@
     __ movp(rdi, rax);
     __ Pop(rax);
     __ SmiToInteger32(rax, rax);
   }
   // The delegate is always a regular function.
   __ AssertFunction(rdi);
   __ Jump(masm->isolate()->builtins()->CallFunction(), RelocInfo::CODE_TARGET);
 }
 
 
+// static
+void Builtins::Generate_PushArgsAndCall(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.
+  __ Pop(rdx);
+
+  // Find the address of the last argument.
+  __ movp(rcx, rax);
+  __ 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);
+
+  // Call the target.
+  __ Push(rdx);  // Re-push return address.
+  __ Jump(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
+}
+
+
 void Builtins::Generate_OnStackReplacement(MacroAssembler* masm) {
   // Lookup the function in the JavaScript frame.
   __ movp(rax, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
   {
     FrameScope scope(masm, StackFrame::INTERNAL);
     // Pass function as argument.
     __ Push(rax);
     __ CallRuntime(Runtime::kCompileForOnStackReplacement, 1);
   }
 
@@ skipping 39 matching lines @@
   __ ret(0);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64