Port faster callbacks invocation to x64.

src/x64/macro-assembler-x64.h

Index: src/x64/macro-assembler-x64.h
diff --git a/src/x64/macro-assembler-x64.h b/src/x64/macro-assembler-x64.h
index 64f35e10de3e50df682d9f6830410be0d30b8146..7a90dd0175e5285669c086fba76ad450d568106b 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -163,6 +163,11 @@ class MacroAssembler: public Assembler {
   // to the first argument in register rsi.
   void EnterExitFrame(ExitFrame::Mode mode, int result_size = 1);
 
+  void EnterApiExitFrame(ExitFrame::Mode mode,
+                         int stack_space,
+                         int argc,
+                         int result_size = 1);
+
   // Leave the current exit frame. Expects/provides the return value in
   // register rax:rdx (untouched) and the pointer to the first
   // argument in register rsi.
@@ -719,18 +724,36 @@ class MacroAssembler: public Assembler {
   // Call a code stub.
   void CallStub(CodeStub* stub);
 
+  // Call a code stub and return the code object called.  Try to generate
+  // the code if necessary.  Do not perform a GC but instead return a retry
+  // after GC failure.
+  Object* TryCallStub(CodeStub* stub);
+
   // Tail call a code stub (jump).
   void TailCallStub(CodeStub* stub);
 
+  // Tail call a code stub (jump) and return the code object called.  Try to
+  // generate the code if necessary.  Do not perform a GC but instead return
+  // a retry after GC failure.
+  Object* TryTailCallStub(CodeStub* stub);
+
   // Return from a code stub after popping its arguments.
   void StubReturn(int argc);
 
   // Call a runtime routine.
   void CallRuntime(Runtime::Function* f, int num_arguments);
 
+  // Call a runtime function, returning the CodeStub object called.
+  // Try to generate the stub code if necessary.  Do not perform a GC
+  // but instead return a retry after GC failure.
+  Object* TryCallRuntime(Runtime::Function* f, int num_arguments);
+
   // Convenience function: Same as above, but takes the fid instead.
   void CallRuntime(Runtime::FunctionId id, int num_arguments);
 
+  // Convenience function: Same as above, but takes the fid instead.
+  Object* TryCallRuntime(Runtime::FunctionId id, int num_arguments);
+
   // Convenience function: call an external reference.
   void CallExternalReference(const ExternalReference& ext,
                              int num_arguments);
@@ -747,6 +770,16 @@ class MacroAssembler: public Assembler {
                        int num_arguments,
                        int result_size);
 
+  void PushHandleScope(Register scratch);
+
+  // Pops a handle scope using the specified scratch register and
+  // ensuring that saved register is left unchanged.
+  void PopHandleScope(Register saved, Register scratch);
+
+  // As PopHandleScope, but does not perform a GC.  Instead, returns a
+  // retry after GC failure object if GC is necessary.
+  Object* TryPopHandleScope(Register saved, Register scratch);
+
   // Jump to a runtime routine.
   void JumpToExternalReference(const ExternalReference& ext, int result_size);
 
@@ -835,6 +868,9 @@ class MacroAssembler: public Assembler {
   void EnterFrame(StackFrame::Type type);
   void LeaveFrame(StackFrame::Type type);
 
+  void EnterExitFramePrologue(ExitFrame::Mode mode, bool save_rax);
+  void EnterExitFrameEpilogue(ExitFrame::Mode mode, int result_size, int argc);
+
   // Allocation support helpers.
   // Loads the top of new-space into the result register.
   // If flags contains RESULT_CONTAINS_TOP then result_end is valid and
@@ -848,6 +884,13 @@ class MacroAssembler: public Assembler {
   // Update allocation top with value in result_end register.
   // If scratch is valid, it contains the address of the allocation top.
   void UpdateAllocationTopHelper(Register result_end, Register scratch);
+
+  // Helper for PopHandleScope.  Allowed to perform a GC and returns
+  // NULL if gc_allowed.  Does not perform a GC if !gc_allowed, and
+  // possibly returns a failure object indicating an allocation failure.
+  Object* PopHandleScopeHelper(Register saved,
+                               Register scratch,
+                               bool gc_allowed);
 };