Revert "Unify calling to GenerateFastApiCallBody before stubbing it"

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 dbfd419290c692b61758bacb58d9e76dcea55668..392c96be6c7759933bac9c72bbaf0deb3352fb15 100644
--- a/src/x64/stub-cache-x64.cc
+++ b/src/x64/stub-cache-x64.cc
@@ -392,57 +392,92 @@ static void CompileCallLoadPropertyWithInterceptor(
 static const int kFastApiCallArguments = FunctionCallbackArguments::kArgsLength;
 
 
+// Reserves space for the extra arguments to API function in the
+// caller's frame.
+//
+// These arguments are set by CheckPrototypes and GenerateFastApiCall.
+static void ReserveSpaceForFastApiCall(MacroAssembler* masm, Register scratch) {
+  // ----------- S t a t e -------------
+  //  -- rsp[0] : return address
+  //  -- rsp[8] : last argument in the internal frame of the caller
+  // -----------------------------------
+  __ movq(scratch, StackOperandForReturnAddress(0));
+  __ subq(rsp, Immediate(kFastApiCallArguments * kPointerSize));
+  __ movq(StackOperandForReturnAddress(0), scratch);
+  __ Move(scratch, Smi::FromInt(0));
+  StackArgumentsAccessor args(rsp, kFastApiCallArguments,
+                              ARGUMENTS_DONT_CONTAIN_RECEIVER);
+  for (int i = 0; i < kFastApiCallArguments; i++) {
+     __ movp(args.GetArgumentOperand(i), scratch);
+  }
+}
+
+
+// Undoes the effects of ReserveSpaceForFastApiCall.
+static void FreeSpaceForFastApiCall(MacroAssembler* masm, Register scratch) {
+  // ----------- S t a t e -------------
+  //  -- rsp[0]                             : return address.
+  //  -- rsp[8]                             : last fast api call extra argument.
+  //  -- ...
+  //  -- rsp[kFastApiCallArguments * 8]     : first fast api call extra
+  //                                          argument.
+  //  -- rsp[kFastApiCallArguments * 8 + 8] : last argument in the internal
+  //                                          frame.
+  // -----------------------------------
+  __ movq(scratch, StackOperandForReturnAddress(0));
+  __ movq(StackOperandForReturnAddress(kFastApiCallArguments * kPointerSize),
+          scratch);
+  __ addq(rsp, Immediate(kPointerSize * kFastApiCallArguments));
+}
+
+
 static void GenerateFastApiCallBody(MacroAssembler* masm,
                                     const CallOptimization& optimization,
                                     int argc,
-                                    Register holder,
-                                    Register scratch1,
-                                    Register scratch2,
-                                    Register scratch3,
                                     bool restore_context);
 
 
 // Generates call to API function.
 static void GenerateFastApiCall(MacroAssembler* masm,
                                 const CallOptimization& optimization,
-                                int argc,
-                                Handle<Map> map_to_holder,
-                                CallOptimization::HolderLookup holder_lookup) {
-  Counters* counters = masm->isolate()->counters();
-  __ IncrementCounter(counters->call_const_fast_api(), 1);
+                                int argc) {
+  typedef FunctionCallbackArguments FCA;
+  StackArgumentsAccessor args(rsp, argc + kFastApiCallArguments);
 
-  // Move holder to a register
-  Register holder_reg = rax;
-  switch (holder_lookup) {
-    case CallOptimization::kHolderIsReceiver:
-      {
-        ASSERT(map_to_holder.is_null());
-        StackArgumentsAccessor args(rsp, argc);
-        __ movp(holder_reg, args.GetReceiverOperand());
-      }
-      break;
-    case CallOptimization::kHolderIsPrototypeOfMap:
-      {
-        Handle<JSObject> holder(JSObject::cast(map_to_holder->prototype()));
-        if (!masm->isolate()->heap()->InNewSpace(*holder)) {
-          __ Move(holder_reg, holder);
-        } else {
-          __ Move(holder_reg, map_to_holder);
-          __ movp(holder_reg, FieldOperand(holder_reg, Map::kPrototypeOffset));
-        }
-      }
-     break;
-    case CallOptimization::kHolderNotFound:
-      UNREACHABLE();
+  // Save calling context.
+  int offset = argc + kFastApiCallArguments;
+  __ movp(args.GetArgumentOperand(offset - FCA::kContextSaveIndex), rsi);
+
+  // Get the function and setup the context.
+  Handle<JSFunction> function = optimization.constant_function();
+  __ Move(rdi, function);
+  __ movp(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
+  // Construct the FunctionCallbackInfo on the stack.
+  __ movp(args.GetArgumentOperand(offset - FCA::kCalleeIndex), rdi);
+  Handle<CallHandlerInfo> api_call_info = optimization.api_call_info();
+  Handle<Object> call_data(api_call_info->data(), masm->isolate());
+  if (masm->isolate()->heap()->InNewSpace(*call_data)) {
+    __ Move(rcx, api_call_info);
+    __ movp(rbx, FieldOperand(rcx, CallHandlerInfo::kDataOffset));
+    __ movp(args.GetArgumentOperand(offset - FCA::kDataIndex), rbx);
+  } else {
+    __ Move(args.GetArgumentOperand(offset - FCA::kDataIndex), call_data);
   }
-  GenerateFastApiCallBody(masm,
-                          optimization,
-                          argc,
-                          holder_reg,
-                          rbx,
-                          rcx,
-                          rdx,
-                          false);
+  __ Move(kScratchRegister,
+          ExternalReference::isolate_address(masm->isolate()));
+  __ movp(args.GetArgumentOperand(offset - FCA::kIsolateIndex),
+          kScratchRegister);
+  __ LoadRoot(kScratchRegister, Heap::kUndefinedValueRootIndex);
+  __ movp(args.GetArgumentOperand(offset - FCA::kReturnValueDefaultValueIndex),
+          kScratchRegister);
+  __ movp(args.GetArgumentOperand(offset - FCA::kReturnValueOffset),
+          kScratchRegister);
+
+  // Prepare arguments.
+  STATIC_ASSERT(kFastApiCallArguments == 7);
+  __ lea(rax, args.GetArgumentOperand(offset - FCA::kHolderIndex));
+
+  GenerateFastApiCallBody(masm, optimization, argc, false);
 }
 
 
@@ -458,9 +493,13 @@ static void GenerateFastApiCall(MacroAssembler* masm,
                                 Register scratch3,
                                 int argc,
                                 Register* values) {
+  ASSERT(optimization.is_simple_api_call());
+
   __ PopReturnAddressTo(scratch1);
+
   // receiver
   __ push(receiver);
+
   // Write the arguments to stack frame.
   for (int i = 0; i < argc; i++) {
     Register arg = values[argc-1-i];
@@ -470,35 +509,6 @@ static void GenerateFastApiCall(MacroAssembler* masm,
     ASSERT(!scratch3.is(arg));
     __ push(arg);
   }
-  __ PushReturnAddressFrom(scratch1);
-  // Stack now matches JSFunction abi.
-  GenerateFastApiCallBody(masm,
-                          optimization,
-                          argc,
-                          receiver,
-                          scratch1,
-                          scratch2,
-                          scratch3,
-                          true);
-}
-
-
-static void GenerateFastApiCallBody(MacroAssembler* masm,
-                                    const CallOptimization& optimization,
-                                    int argc,
-                                    Register holder,
-                                    Register scratch1,
-                                    Register scratch2,
-                                    Register scratch3,
-                                    bool restore_context) {
-  // ----------- S t a t e -------------
-  //  -- rsp[0]              : return address
-  //  -- rsp[8]              : last argument
-  //  -- ...
-  //  -- rsp[argc * 8]       : first argument
-  //  -- rsp[(argc + 1) * 8] : receiver
-  // -----------------------------------
-  ASSERT(optimization.is_simple_api_call());
 
   typedef FunctionCallbackArguments FCA;
 
@@ -511,9 +521,6 @@ static void GenerateFastApiCallBody(MacroAssembler* masm,
   STATIC_ASSERT(FCA::kContextSaveIndex == 6);
   STATIC_ASSERT(FCA::kArgsLength == 7);
 
-  __ PopReturnAddressTo(scratch1);
-
-  ASSERT(!holder.is(rsi));
   // context save
   __ push(rsi);
 
@@ -550,13 +557,36 @@ static void GenerateFastApiCallBody(MacroAssembler* masm,
           ExternalReference::isolate_address(masm->isolate()));
   __ push(scratch3);
   // holder
-  __ push(holder);
+  __ push(receiver);
 
   ASSERT(!scratch1.is(rax));
+  // store receiver address for GenerateFastApiCallBody
   __ movp(rax, rsp);
-  // Push return address back on stack.
   __ PushReturnAddressFrom(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());
 
@@ -652,17 +682,38 @@ class CallInterceptorCompiler BASE_EMBEDDED {
     ASSERT(optimization.is_constant_call());
     ASSERT(!lookup->holder()->IsGlobalObject());
 
+    int depth1 = kInvalidProtoDepth;
+    int depth2 = kInvalidProtoDepth;
+    bool can_do_fast_api_call = false;
+    if (optimization.is_simple_api_call() &&
+        !lookup->holder()->IsGlobalObject()) {
+      depth1 = optimization.GetPrototypeDepthOfExpectedType(
+          object, interceptor_holder);
+      if (depth1 == kInvalidProtoDepth) {
+        depth2 = optimization.GetPrototypeDepthOfExpectedType(
+            interceptor_holder, Handle<JSObject>(lookup->holder()));
+      }
+      can_do_fast_api_call =
+          depth1 != kInvalidProtoDepth || depth2 != kInvalidProtoDepth;
+    }
+
     Counters* counters = masm->isolate()->counters();
     __ IncrementCounter(counters->call_const_interceptor(), 1);
 
+    if (can_do_fast_api_call) {
+      __ IncrementCounter(counters->call_const_interceptor_fast_api(), 1);
+      ReserveSpaceForFastApiCall(masm, scratch1);
+    }
+
     // Check that the maps from receiver to interceptor's holder
     // haven't changed and thus we can invoke interceptor.
     Label miss_cleanup;
+    Label* miss = can_do_fast_api_call ? &miss_cleanup : miss_label;
     Register holder =
         stub_compiler_->CheckPrototypes(
             IC::CurrentTypeOf(object, masm->isolate()), receiver,
             interceptor_holder, scratch1, scratch2, scratch3,
-            name, miss_label);
+            name, depth1, miss);
 
     // Invoke an interceptor and if it provides a value,
     // branch to |regular_invoke|.
@@ -679,41 +730,35 @@ class CallInterceptorCompiler BASE_EMBEDDED {
       stub_compiler_->CheckPrototypes(
           IC::CurrentTypeOf(interceptor_holder, masm->isolate()), holder,
           handle(lookup->holder()), scratch1, scratch2, scratch3,
-          name, miss_label);
-    }
-
-    Handle<Map> lookup_map;
-    CallOptimization::HolderLookup holder_lookup =
-        CallOptimization::kHolderNotFound;
-    if (optimization.is_simple_api_call() &&
-        !lookup->holder()->IsGlobalObject()) {
-      lookup_map = optimization.LookupHolderOfExpectedType(
-          object, object, interceptor_holder, &holder_lookup);
-      if (holder_lookup == CallOptimization::kHolderNotFound) {
-        lookup_map =
-            optimization.LookupHolderOfExpectedType(
-                object,
-                interceptor_holder,
-                Handle<JSObject>(lookup->holder()),
-                &holder_lookup);
-      }
+          name, depth2, miss);
+    } else {
+      // CheckPrototypes has a side effect of fetching a 'holder'
+      // for API (object which is instanceof for the signature).  It's
+      // safe to omit it here, as if present, it should be fetched
+      // by the previous CheckPrototypes.
+      ASSERT(depth2 == kInvalidProtoDepth);
     }
 
     // Invoke function.
-    if (holder_lookup != CallOptimization::kHolderNotFound) {
-      int argc = arguments_.immediate();
-      GenerateFastApiCall(masm,
-                          optimization,
-                          argc,
-                          lookup_map,
-                          holder_lookup);
+    if (can_do_fast_api_call) {
+      GenerateFastApiCall(masm, optimization, arguments_.immediate());
     } else {
       Handle<JSFunction> fun = optimization.constant_function();
       stub_compiler_->GenerateJumpFunction(object, fun);
     }
 
+    // Deferred code for fast API call case---clean preallocated space.
+    if (can_do_fast_api_call) {
+      __ bind(&miss_cleanup);
+      FreeSpaceForFastApiCall(masm, scratch1);
+      __ jmp(miss_label);
+    }
+
     // Invoke a regular function.
     __ bind(&regular_invoke);
+    if (can_do_fast_api_call) {
+      FreeSpaceForFastApiCall(masm, scratch1);
+    }
   }
 
   void CompileRegular(MacroAssembler* masm,
@@ -1075,6 +1120,7 @@ Register StubCompiler::CheckPrototypes(Handle<HeapType> type,
                                        Register scratch1,
                                        Register scratch2,
                                        Handle<Name> name,
+                                       int save_at_depth,
                                        Label* miss,
                                        PrototypeCheckType check) {
   Handle<Map> receiver_map(IC::TypeToMap(*type, isolate()));
@@ -1093,6 +1139,15 @@ Register StubCompiler::CheckPrototypes(Handle<HeapType> type,
   Register reg = object_reg;
   int depth = 0;
 
+  StackArgumentsAccessor args(rsp, kFastApiCallArguments,
+                              ARGUMENTS_DONT_CONTAIN_RECEIVER);
+  const int kHolderIndex = kFastApiCallArguments - 1 -
+      FunctionCallbackArguments::kHolderIndex;
+
+  if (save_at_depth == depth) {
+    __ movp(args.GetArgumentOperand(kHolderIndex), object_reg);
+  }
+
   Handle<JSObject> current = Handle<JSObject>::null();
   if (type->IsConstant()) current = Handle<JSObject>::cast(type->AsConstant());
   Handle<JSObject> prototype = Handle<JSObject>::null();
@@ -1158,6 +1213,10 @@ Register StubCompiler::CheckPrototypes(Handle<HeapType> type,
       }
     }
 
+    if (save_at_depth == depth) {
+      __ movp(args.GetArgumentOperand(kHolderIndex), reg);
+    }
+
     // Go to the next object in the prototype chain.
     current = prototype;
     current_map = handle(current->map());
@@ -1547,35 +1606,43 @@ Handle<Code> CallStubCompiler::CompileFastApiCall(
   if (object->IsGlobalObject()) return Handle<Code>::null();
   if (!cell.is_null()) return Handle<Code>::null();
   if (!object->IsJSObject()) return Handle<Code>::null();
-  Handle<JSObject> receiver = Handle<JSObject>::cast(object);
-  CallOptimization::HolderLookup holder_lookup =
-      CallOptimization::kHolderNotFound;
-  Handle<Map> lookup_map = optimization.LookupHolderOfExpectedType(
-      receiver, receiver, holder, &holder_lookup);
-  if (holder_lookup == CallOptimization::kHolderNotFound) {
-    return Handle<Code>::null();
-  }
+  int depth = optimization.GetPrototypeDepthOfExpectedType(
+      Handle<JSObject>::cast(object), holder);
+  if (depth == kInvalidProtoDepth) return Handle<Code>::null();
 
-  Label miss;
-  GenerateNameCheck(name, &miss);
+  Label miss, miss_before_stack_reserved;
+  GenerateNameCheck(name, &miss_before_stack_reserved);
 
   const int argc = arguments().immediate();
   StackArgumentsAccessor args(rsp, argc);
   __ movp(rdx, args.GetReceiverOperand());
 
   // Check that the receiver isn't a smi.
-  __ JumpIfSmi(rdx, &miss);
+  __ JumpIfSmi(rdx, &miss_before_stack_reserved);
 
   Counters* counters = isolate()->counters();
   __ IncrementCounter(counters->call_const(), 1);
+  __ IncrementCounter(counters->call_const_fast_api(), 1);
+
+  // Allocate space for v8::Arguments implicit values. Must be initialized
+  // before calling any runtime function.
+  __ subq(rsp, Immediate(kFastApiCallArguments * kPointerSize));
 
   // Check that the maps haven't changed and find a Holder as a side effect.
   CheckPrototypes(IC::CurrentTypeOf(object, isolate()), rdx, holder,
-                  rbx, rax, rdi, name, &miss);
+                  rbx, rax, rdi, name, depth, &miss);
 
-  GenerateFastApiCall(masm(), optimization, argc, lookup_map, holder_lookup);
+  // Move the return address on top of the stack.
+  __ movq(rax,
+          StackOperandForReturnAddress(kFastApiCallArguments * kPointerSize));
+  __ movq(StackOperandForReturnAddress(0), rax);
 
-  HandlerFrontendFooter(&miss);
+  GenerateFastApiCall(masm(), optimization, argc);
+
+  __ bind(&miss);
+  __ addq(rsp, Immediate(kFastApiCallArguments * kPointerSize));
+
+  HandlerFrontendFooter(&miss_before_stack_reserved);
 
   // Return the generated code.
   return GetCode(function);