Implement ES6 rest parameters

src/x64/full-codegen-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.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 214 matching lines @@
         } else if (FLAG_debug_code) {
           Label done;
           __ JumpIfInNewSpace(rsi, rax, &done, Label::kNear);
           __ Abort(kExpectedNewSpaceObject);
           __ bind(&done);
         }
       }
     }
   }
 
+  // Possibly allocate RestParameters
+  int rest_index;
+  Variable* rest_param = scope()->rest_parameter(&rest_index);
+  if (rest_param) {
+    Comment cmnt(masm_, "[ Allocate rest parameter array");
+
+    int num_parameters = info->scope()->num_parameters();
+    int offset = num_parameters * kPointerSize;
+    __ leap(rdx,
+            Operand(rbp, StandardFrameConstants::kCallerSPOffset + offset));
+    __ Push(rdx);
+    __ Push(Smi::FromInt(num_parameters));
+    __ Push(Smi::FromInt(rest_index));
+
+    RestParamAccessStub stub(isolate());
+    __ CallStub(&stub);
+
+    SetVar(rest_param, rax, rbx, rdx);
+  }
+
   // Possibly allocate an arguments object.
   Variable* arguments = scope()->arguments();
   if (arguments != NULL) {
     // Arguments object must be allocated after the context object, in
     // case the "arguments" or ".arguments" variables are in the context.
     Comment cmnt(masm_, "[ Allocate arguments object");
     if (function_in_register) {
       __ Push(rdi);
     } else {
       __ Push(Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
     }
     // The receiver is just before the parameters on the caller's stack.
     int num_parameters = info->scope()->num_parameters();
     int offset = num_parameters * kPointerSize;
     __ leap(rdx,
            Operand(rbp, StandardFrameConstants::kCallerSPOffset + offset));
     __ Push(rdx);
     __ Push(Smi::FromInt(num_parameters));
     // Arguments to ArgumentsAccessStub:
     //   function, receiver address, parameter count.
     // The stub will rewrite receiver and parameter count if the previous
     // stack frame was an arguments adapter frame.
 
     ArgumentsAccessStub::HasNewTarget has_new_target =
         IsSubclassConstructor(info->function()->kind())
             ? ArgumentsAccessStub::HAS_NEW_TARGET
             : ArgumentsAccessStub::NO_NEW_TARGET;
     ArgumentsAccessStub::Type type;
-    if (is_strict(language_mode())) {
+    if (is_strict(language_mode()) || !is_simple_parameter_list()) {
       type = ArgumentsAccessStub::NEW_STRICT;
     } else if (function()->has_duplicate_parameters()) {
       type = ArgumentsAccessStub::NEW_SLOPPY_SLOW;
     } else {
       type = ArgumentsAccessStub::NEW_SLOPPY_FAST;
     }
     ArgumentsAccessStub stub(isolate(), type, has_new_target);
     __ CallStub(&stub);
 
     SetVar(arguments, rax, rbx, rdx);
@@ skipping 5092 matching lines @@
   DCHECK_EQ(isolate->builtins()->OsrAfterStackCheck()->entry(),
             Assembler::target_address_at(call_target_address,
                                          unoptimized_code));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64