Revert "[Arguments] Merge (7442,7496] from bleeding_edge."

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index 3a90343b844998253fe4f498e9b2051be008a65b..654814c1e6be3403b60d15e00ae7e1f559ae1d6e 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -40,15 +40,12 @@
 namespace v8 {
 namespace internal {
 
-MacroAssembler::MacroAssembler(Isolate* arg_isolate, void* buffer, int size)
-    : Assembler(arg_isolate, buffer, size),
+MacroAssembler::MacroAssembler(void* buffer, int size)
+    : Assembler(buffer, size),
       generating_stub_(false),
       allow_stub_calls_(true),
-      root_array_available_(true) {
-  if (isolate() != NULL) {
-    code_object_ = Handle<Object>(isolate()->heap()->undefined_value(),
-                                  isolate());
-  }
+      root_array_available_(true),
+      code_object_(isolate()->heap()->undefined_value()) {
 }
 
 
@@ -2854,6 +2851,9 @@ void MacroAssembler::PrepareCallCFunction(int num_arguments) {
   ASSERT(frame_alignment != 0);
   ASSERT(num_arguments >= 0);
 
+  // Reserve space for Isolate address which is always passed as last parameter
+  num_arguments += 1;
+
   // Make stack end at alignment and allocate space for arguments and old rsp.
   movq(kScratchRegister, rsp);
   ASSERT(IsPowerOf2(frame_alignment));
@@ -2873,6 +2873,26 @@ void MacroAssembler::CallCFunction(ExternalReference function,
 
 
 void MacroAssembler::CallCFunction(Register function, int num_arguments) {
+  // Pass current isolate address as additional parameter.
+  if (num_arguments < kRegisterPassedArguments) {
+#ifdef _WIN64
+    // First four arguments are passed in registers on Windows.
+    Register arg_to_reg[] = {rcx, rdx, r8, r9};
+#else
+    // First six arguments are passed in registers on other platforms.
+    Register arg_to_reg[] = {rdi, rsi, rdx, rcx, r8, r9};
+#endif
+    Register reg = arg_to_reg[num_arguments];
+    LoadAddress(reg, ExternalReference::isolate_address());
+  } else {
+    // Push Isolate pointer after all parameters.
+    int argument_slots_on_stack =
+        ArgumentStackSlotsForCFunctionCall(num_arguments);
+    LoadAddress(kScratchRegister, ExternalReference::isolate_address());
+    movq(Operand(rsp, argument_slots_on_stack * kPointerSize),
+         kScratchRegister);
+  }
+
   // Check stack alignment.
   if (emit_debug_code()) {
     CheckStackAlignment();
@@ -2881,6 +2901,7 @@ void MacroAssembler::CallCFunction(Register function, int num_arguments) {
   call(function);
   ASSERT(OS::ActivationFrameAlignment() != 0);
   ASSERT(num_arguments >= 0);
+  num_arguments += 1;
   int argument_slots_on_stack =
       ArgumentStackSlotsForCFunctionCall(num_arguments);
   movq(rsp, Operand(rsp, argument_slots_on_stack * kPointerSize));
@@ -2888,9 +2909,7 @@ void MacroAssembler::CallCFunction(Register function, int num_arguments) {
 
 
 CodePatcher::CodePatcher(byte* address, int size)
-    : address_(address),
-      size_(size),
-      masm_(Isolate::Current(), address, size + Assembler::kGap) {
+    : address_(address), size_(size), masm_(address, size + Assembler::kGap) {
   // Create a new macro assembler pointing to the address of the code to patch.
   // The size is adjusted with kGap on order for the assembler to generate size
   // bytes of instructions without failing with buffer size constraints.