PPC: [api] Expose FunctionCallbackInfo::NewTarget

Port 306c412c

Original commit message:

    This is needed by Blink to implement the Custom Elements spec.

R=adamk@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=v8:4261
LOG=N

Review-Url: https://codereview.chromium.org/1929703002
Cr-Commit-Position: refs/heads/master@{#35838}

src/ppc/builtins-ppc.cc

@@ -605,15 +605,10 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
     // r3: number of arguments
     // r4: constructor function
     // r6: new target
-    if (is_api_function) {
-      __ LoadP(cp, FieldMemOperand(r4, JSFunction::kContextOffset));
-      Handle<Code> code = masm->isolate()->builtins()->HandleApiCallConstruct();
-      __ Call(code, RelocInfo::CODE_TARGET);
-    } else {
+
     ParameterCount actual(r3);
     __ InvokeFunction(r4, r6, actual, CALL_FUNCTION,
                       CheckDebugStepCallWrapper());
-    }
 
     // Store offset of return address for deoptimizer.
     if (create_implicit_receiver && !is_api_function) {

src/ppc/code-stubs-ppc.cc

@@ -5635,7 +5635,11 @@ void CallApiCallbackStub::Generate(MacroAssembler* masm) {
   STATIC_ASSERT(FCA::kReturnValueDefaultValueIndex == 2);
   STATIC_ASSERT(FCA::kIsolateIndex == 1);
   STATIC_ASSERT(FCA::kHolderIndex == 0);
-  STATIC_ASSERT(FCA::kArgsLength == 7);
+  STATIC_ASSERT(FCA::kNewTargetIndex == 7);
+  STATIC_ASSERT(FCA::kArgsLength == 8);
+
+  // new target
+  __ PushRoot(Heap::kUndefinedValueRootIndex);
 
   // context save
   __ push(context);
@@ -5671,10 +5675,10 @@ void CallApiCallbackStub::Generate(MacroAssembler* masm) {
   // it's not controlled by GC.
   // PPC LINUX ABI:
   //
-  // Create 5 extra slots on stack:
+  // Create 4 extra slots on stack:
   //    [0] space for DirectCEntryStub's LR save
-  //    [1-4] FunctionCallbackInfo
-  const int kApiStackSpace = 5;
+  //    [1-3] FunctionCallbackInfo
+  const int kApiStackSpace = 4;
   const int kFunctionCallbackInfoOffset =
       (kStackFrameExtraParamSlot + 1) * kPointerSize;
 
@@ -5693,9 +5697,6 @@ void CallApiCallbackStub::Generate(MacroAssembler* masm) {
   // FunctionCallbackInfo::length_ = argc
   __ li(ip, Operand(argc()));
   __ stw(ip, MemOperand(r3, 2 * kPointerSize));
-  // FunctionCallbackInfo::is_construct_call_ = 0
-  __ li(ip, Operand::Zero());
-  __ stw(ip, MemOperand(r3, 2 * kPointerSize + kIntSize));
 
   ExternalReference thunk_ref =
       ExternalReference::invoke_function_callback(masm->isolate());
@@ -5712,9 +5713,9 @@ void CallApiCallbackStub::Generate(MacroAssembler* masm) {
   }
   MemOperand return_value_operand(fp, return_value_offset * kPointerSize);
   int stack_space = 0;
-  MemOperand is_construct_call_operand =
-      MemOperand(sp, kFunctionCallbackInfoOffset + 2 * kPointerSize + kIntSize);
-  MemOperand* stack_space_operand = &is_construct_call_operand;
+  MemOperand length_operand =
+      MemOperand(sp, kFunctionCallbackInfoOffset + 2 * kPointerSize);
+  MemOperand* stack_space_operand = &length_operand;
   stack_space = argc() + FCA::kArgsLength + 1;
   stack_space_operand = NULL;
   CallApiFunctionAndReturn(masm, api_function_address, thunk_ref, stack_space,