[WIP] Initial CallFunctionCallback builtin.

src/arm/code-stubs-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_ARM
 
 #include "src/code-stubs.h"
 
 #include "src/api-arguments.h"
 #include "src/assembler-inl.h"
@@ skipping 2595 matching lines @@
 
   Label fast_elements_case;
   __ cmp(r3, Operand(FAST_ELEMENTS));
   __ b(eq, &fast_elements_case);
   GenerateCase(masm, FAST_HOLEY_ELEMENTS);
 
   __ bind(&fast_elements_case);
   GenerateCase(masm, FAST_ELEMENTS);
 }
 
-static int AddressOffset(ExternalReference ref0, ExternalReference ref1) {
-  return ref0.address() - ref1.address();
-}
-
-
 // Calls an API function.  Allocates HandleScope, extracts returned value
 // from handle and propagates exceptions.  Restores context.  stack_space
 // - space to be unwound on exit (includes the call JS arguments space and
 // the additional space allocated for the fast call).
 static void CallApiFunctionAndReturn(MacroAssembler* masm,
                                      Register function_address,
                                      ExternalReference thunk_ref,
                                      int stack_space,
                                      MemOperand* stack_space_operand,
                                      MemOperand return_value_operand,
@@ skipping 94 matching lines @@
   }
   __ LeaveExitFrame(false, r4, !restore_context, stack_space_operand != NULL);
 
   // Check if the function scheduled an exception.
   __ LoadRoot(r4, Heap::kTheHoleValueRootIndex);
   __ mov(ip, Operand(ExternalReference::scheduled_exception_address(isolate)));
   __ ldr(r5, MemOperand(ip));
   __ cmp(r4, r5);
   __ b(ne, &promote_scheduled_exception);
 
+  // Check if the function returned a valid JavaScript value.
+  __ AssertApiCallResult(r0);
+
   __ mov(pc, lr);
 
   // Re-throw by promoting a scheduled exception.
   __ bind(&promote_scheduled_exception);
   __ TailCallRuntime(Runtime::kPromoteScheduledException);
 
   // HandleScope limit has changed. Delete allocated extensions.
   __ bind(&delete_allocated_handles);
   __ str(r5, MemOperand(r9, kLimitOffset));
   __ mov(r4, r0);
@@ skipping 58 matching lines @@
   // return value
   __ push(scratch);
   // return value default
   __ push(scratch);
   // isolate
   __ mov(scratch, Operand(ExternalReference::isolate_address(masm->isolate())));
   __ push(scratch);
   // holder
   __ push(holder);
 
+  if (!is_store()) {
+    __ mov(r0, Operand(argc()));
+    __ Jump(masm->isolate()->builtins()->CallFunctionCallback(),
+            RelocInfo::CODE_TARGET);
+  }
+
   // Prepare arguments.
   __ mov(scratch, sp);
 
   // Allocate the v8::Arguments structure in the arguments' space since
   // it's not controlled by GC.
   const int kApiStackSpace = 3;
 
   FrameScope frame_scope(masm, StackFrame::MANUAL);
   __ EnterExitFrame(false, kApiStackSpace);
 
@@ skipping 96 matching lines @@
   CallApiFunctionAndReturn(masm, api_function_address, thunk_ref,
                            kStackUnwindSpace, NULL, return_value_operand, NULL);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM