faster stack frame generation for accessor property ics

src/x64/stub-cache-x64.cc

Index: src/x64/stub-cache-x64.cc
diff --git a/src/x64/stub-cache-x64.cc b/src/x64/stub-cache-x64.cc
index a1e8f211161e9c42cbfeffa0f9d9d3eb9818bcae..53f664f0677abfda81d8c1ae3c95d84e1b51f4af 100644
--- a/src/x64/stub-cache-x64.cc
+++ b/src/x64/stub-cache-x64.cc
@@ -436,21 +436,16 @@ static void FreeSpaceForFastApiCall(MacroAssembler* masm, Register scratch) {
 }
 
 
+static void GenerateFastApiCallBody(MacroAssembler* masm,
+                                    const CallOptimization& optimization,
+                                    int argc,
+                                    bool restore_context);
+
+
 // Generates call to API function.
 static void GenerateFastApiCall(MacroAssembler* masm,
                                 const CallOptimization& optimization,
-                                int argc,
-                                bool restore_context) {
-  // ----------- S t a t e -------------
-  //  -- rsp[0]              : return address
-  //  -- rsp[8] - rsp[56]    : FunctionCallbackInfo, incl.
-  //                         :  object passing the type check
-  //                            (set by CheckPrototypes)
-  //  -- rsp[64]             : last argument
-  //  -- ...
-  //  -- rsp[(argc + 7) * 8] : first argument
-  //  -- rsp[(argc + 8) * 8] : receiver
-  // -----------------------------------
+                                int argc) {
   typedef FunctionCallbackArguments FCA;
   StackArgumentsAccessor args(rsp, argc + kFastApiCallArguments);
 
@@ -485,8 +480,121 @@ static void GenerateFastApiCall(MacroAssembler* masm,
 
   // Prepare arguments.
   STATIC_ASSERT(kFastApiCallArguments == 7);
-  __ lea(rbx, Operand(rsp, 1 * kPointerSize));
+  __ lea(rax, Operand(rsp, 1 * kPointerSize));
+
+  GenerateFastApiCallBody(masm, optimization, argc, false);
+}
+
+
+// Generate call to api function.
+// This function uses push() to generate smaller, faster code than
+// the version above. It is an optimization that should will be removed
+// when api call ICs are generated in hydrogen.
+static void GenerateFastApiCall(MacroAssembler* masm,
+                                const CallOptimization& optimization,
+                                Register receiver,
+                                Register scratch1,
+                                Register scratch2,
+                                Register scratch3,
+                                int argc,
+                                Register* values) {
+  ASSERT(optimization.is_simple_api_call());
+
+  // Copy return value.
+  __ pop(scratch1);
+
+  // receiver
+  __ push(receiver);
+
+  // Write the arguments to stack frame.
+  for (int i = 0; i < argc; i++) {
+    Register arg = values[argc-1-i];
+    ASSERT(!receiver.is(arg));
+    ASSERT(!scratch1.is(arg));
+    ASSERT(!scratch2.is(arg));
+    ASSERT(!scratch3.is(arg));
+    __ push(arg);
+  }
+
+  typedef FunctionCallbackArguments FCA;
+
+  STATIC_ASSERT(FCA::kHolderIndex == 0);
+  STATIC_ASSERT(FCA::kIsolateIndex == 1);
+  STATIC_ASSERT(FCA::kReturnValueDefaultValueIndex == 2);
+  STATIC_ASSERT(FCA::kReturnValueOffset == 3);
+  STATIC_ASSERT(FCA::kDataIndex == 4);
+  STATIC_ASSERT(FCA::kCalleeIndex == 5);
+  STATIC_ASSERT(FCA::kContextSaveIndex == 6);
+  STATIC_ASSERT(FCA::kArgsLength == 7);
+
+  // context save
+  __ push(rsi);
+
+  // Get the function and setup the context.
+  Handle<JSFunction> function = optimization.constant_function();
+  __ Move(scratch2, function);
+  __ push(scratch2);
+
+  Isolate* isolate = masm->isolate();
+  Handle<CallHandlerInfo> api_call_info = optimization.api_call_info();
+  Handle<Object> call_data(api_call_info->data(), isolate);
+  // Push data from ExecutableAccessorInfo.
+  bool call_data_undefined = false;
+  if (isolate->heap()->InNewSpace(*call_data)) {
+    __ Move(scratch2, api_call_info);
+    __ movq(scratch3, FieldOperand(scratch2, CallHandlerInfo::kDataOffset));
+  } else if (call_data->IsUndefined()) {
+    call_data_undefined = true;
+    __ LoadRoot(scratch3, Heap::kUndefinedValueRootIndex);
+  } else {
+    __ Move(scratch3, call_data);
+  }
+  // call data
+  __ push(scratch3);
+  if (!call_data_undefined) {
+    __ LoadRoot(scratch3, Heap::kUndefinedValueRootIndex);
+  }
+  // return value
+  __ push(scratch3);
+  // return value default
+  __ push(scratch3);
+  // isolate
+  __ Move(scratch3,
+          ExternalReference::isolate_address(masm->isolate()));
+  __ push(scratch3);
+  // holder
+  __ push(receiver);
+
+  ASSERT(!scratch1.is(rax));
+  // store receiver address for GenerateFastApiCallBody
+  __ movq(rax, rsp);
 
+  // return address
+  __ push(scratch1);
+
+  GenerateFastApiCallBody(masm, optimization, argc, true);
+}
+
+
+static void GenerateFastApiCallBody(MacroAssembler* masm,
+                                    const CallOptimization& optimization,
+                                    int argc,
+                                    bool restore_context) {
+  // ----------- S t a t e -------------
+  //  -- rsp[0]              : return address
+  //  -- rsp[8] - rsp[56]    : FunctionCallbackInfo, incl.
+  //                         :  object passing the type check
+  //                            (set by CheckPrototypes)
+  //  -- rsp[64]             : last argument
+  //  -- ...
+  //  -- rsp[(argc + 7) * 8] : first argument
+  //  -- rsp[(argc + 8) * 8] : receiver
+  //
+  // rax : receiver address
+  // -----------------------------------
+  typedef FunctionCallbackArguments FCA;
+
+  Handle<CallHandlerInfo> api_call_info = optimization.api_call_info();
   // Function address is a foreign pointer outside V8's heap.
   Address function_address = v8::ToCData<Address>(api_call_info->callback());
 
@@ -496,9 +604,9 @@ static void GenerateFastApiCall(MacroAssembler* masm,
 
   __ PrepareCallApiFunction(kApiStackSpace);
 
-  __ movq(StackSpaceOperand(0), rbx);  // FunctionCallbackInfo::implicit_args_.
-  __ addq(rbx, Immediate((argc + kFastApiCallArguments - 1) * kPointerSize));
-  __ movq(StackSpaceOperand(1), rbx);  // FunctionCallbackInfo::values_.
+  __ movq(StackSpaceOperand(0), rax);  // FunctionCallbackInfo::implicit_args_.
+  __ addq(rax, Immediate((argc + kFastApiCallArguments - 1) * kPointerSize));
+  __ movq(StackSpaceOperand(1), rax);  // FunctionCallbackInfo::values_.
   __ Set(StackSpaceOperand(2), argc);  // FunctionCallbackInfo::length_.
   // FunctionCallbackInfo::is_construct_call_.
   __ Set(StackSpaceOperand(3), 0);
@@ -532,39 +640,6 @@ static void GenerateFastApiCall(MacroAssembler* masm,
 }
 
 
-// Generate call to api function.
-static void GenerateFastApiCall(MacroAssembler* masm,
-                                const CallOptimization& optimization,
-                                Register receiver,
-                                Register scratch,
-                                int argc,
-                                Register* values) {
-  ASSERT(optimization.is_simple_api_call());
-  ASSERT(!receiver.is(scratch));
-
-  const int fast_api_call_argc = argc + kFastApiCallArguments;
-  StackArgumentsAccessor args(rsp, fast_api_call_argc);
-  // argc + 1 is the argument number before FastApiCall arguments, 1 ~ receiver
-  const int kHolderIndex = argc + 1 +
-      kFastApiCallArguments - 1 - FunctionCallbackArguments::kHolderIndex;
-  __ movq(scratch, StackOperandForReturnAddress(0));
-  // Assign stack space for the call arguments and receiver.
-  __ subq(rsp, Immediate((fast_api_call_argc + 1) * kPointerSize));
-  __ movq(StackOperandForReturnAddress(0), scratch);
-  // Write holder to stack frame.
-  __ movq(args.GetArgumentOperand(kHolderIndex), receiver);
-  __ movq(args.GetReceiverOperand(), receiver);
-  // Write the arguments to stack frame.
-  for (int i = 0; i < argc; i++) {
-    ASSERT(!receiver.is(values[i]));
-    ASSERT(!scratch.is(values[i]));
-    __ movq(args.GetArgumentOperand(i + 1), values[i]);
-  }
-
-  GenerateFastApiCall(masm, optimization, argc, true);
-}
-
-
 class CallInterceptorCompiler BASE_EMBEDDED {
  public:
   CallInterceptorCompiler(StubCompiler* stub_compiler,
@@ -675,7 +750,7 @@ class CallInterceptorCompiler BASE_EMBEDDED {
 
     // Invoke function.
     if (can_do_fast_api_call) {
-      GenerateFastApiCall(masm, optimization, arguments_.immediate(), false);
+      GenerateFastApiCall(masm, optimization, arguments_.immediate());
     } else {
       CallKind call_kind = CallICBase::Contextual::decode(extra_ic_state_)
           ? CALL_AS_FUNCTION
@@ -1294,7 +1369,8 @@ void LoadStubCompiler::GenerateLoadField(Register reg,
 void LoadStubCompiler::GenerateLoadCallback(
     const CallOptimization& call_optimization) {
   GenerateFastApiCall(
-      masm(), call_optimization, receiver(), scratch3(), 0, NULL);
+      masm(), call_optimization, receiver(),
+      scratch1(), scratch2(), name(), 0, NULL);
 }
 
 
@@ -2501,7 +2577,7 @@ Handle<Code> CallStubCompiler::CompileFastApiCall(
           StackOperandForReturnAddress(kFastApiCallArguments * kPointerSize));
   __ movq(StackOperandForReturnAddress(0), rax);
 
-  GenerateFastApiCall(masm(), optimization, argc, false);
+  GenerateFastApiCall(masm(), optimization, argc);
 
   __ bind(&miss);
   __ addq(rsp, Immediate(kFastApiCallArguments * kPointerSize));
@@ -2821,7 +2897,8 @@ Handle<Code> StoreStubCompiler::CompileStoreCallback(
 
   Register values[] = { value() };
   GenerateFastApiCall(
-      masm(), call_optimization, receiver(), scratch3(), 1, values);
+      masm(), call_optimization, receiver(), scratch1(),
+      scratch2(), this->name(), 1, values);
 
   // Return the generated code.
   return GetCode(kind(), Code::CALLBACKS, name);