[WIP] Initial CallFunctionCallback builtin.

src/mips/code-stubs-mips.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_MIPS
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 2777 matching lines @@
   }
 
   Label fast_elements_case;
   __ Branch(&fast_elements_case, eq, a3, Operand(FAST_ELEMENTS));
   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, int32_t stack_space_offset,
     MemOperand return_value_operand, MemOperand* context_restore_operand) {
   Isolate* isolate = masm->isolate();
   ExternalReference next_address =
@@ skipping 91 matching lines @@
   }
   __ LeaveExitFrame(false, s0, !restore_context, NO_EMIT_RETURN,
                     stack_space_offset != kInvalidStackOffset);
 
   // Check if the function scheduled an exception.
   __ LoadRoot(t0, Heap::kTheHoleValueRootIndex);
   __ li(at, Operand(ExternalReference::scheduled_exception_address(isolate)));
   __ lw(t1, MemOperand(at));
   __ Branch(&promote_scheduled_exception, ne, t0, Operand(t1));
 
+  // Check if the function returned a valid JavaScript value.
+  __ AssertApiCallResult(v0);
+
   __ Ret();
 
   // 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);
   __ sw(s1, MemOperand(s3, kLimitOffset));
   __ mov(s0, v0);
@@ skipping 49 matching lines @@
   }
 
   Register scratch = call_data;
   __ LoadRoot(scratch, Heap::kUndefinedValueRootIndex);
   // Push return value and default return value.
   __ Push(scratch, scratch);
   __ li(scratch, Operand(ExternalReference::isolate_address(masm->isolate())));
   // Push isolate and holder.
   __ Push(scratch, holder);
 
+  if (!is_store()) {
+    __ li(a0, 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 105 matching lines @@
                            kStackUnwindSpace, kInvalidStackOffset,
                            return_value_operand, NULL);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS