new style of property/function callbacks

src/arm/macro-assembler-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2250 matching lines @@
   Jump(stub->GetCode(isolate()), RelocInfo::CODE_TARGET, cond);
 }
 
 
 static int AddressOffset(ExternalReference ref0, ExternalReference ref1) {
   return ref0.address() - ref1.address();
 }
 
 
 void MacroAssembler::CallApiFunctionAndReturn(ExternalReference function,
-                                              int stack_space) {
+                                              int stack_space,
+                                              bool returns_handle,
+                                              int return_value_offset) {
   ExternalReference next_address =
       ExternalReference::handle_scope_next_address(isolate());
   const int kNextOffset = 0;
   const int kLimitOffset = AddressOffset(
       ExternalReference::handle_scope_limit_address(isolate()),
       next_address);
   const int kLevelOffset = AddressOffset(
       ExternalReference::handle_scope_level_address(isolate()),
       next_address);
 
@@ skipping 25 matching lines @@
     PushSafepointRegisters();
     PrepareCallCFunction(1, r0);
     mov(r0, Operand(ExternalReference::isolate_address(isolate())));
     CallCFunction(ExternalReference::log_leave_external_function(isolate()), 1);
     PopSafepointRegisters();
   }
 
   Label promote_scheduled_exception;
   Label delete_allocated_handles;
   Label leave_exit_frame;
+  Label return_value_loaded;
 
-  // If result is non-zero, dereference to get the result value
-  // otherwise set it to undefined.
-  cmp(r0, Operand::Zero());
-  LoadRoot(r0, Heap::kUndefinedValueRootIndex, eq);
-  ldr(r0, MemOperand(r0), ne);
-
+  if (returns_handle) {
+    Label load_return_value;
+    cmp(r0, Operand::Zero());
+    b(eq, &load_return_value);
+    // derefernce returned value
+    ldr(r0, MemOperand(r0));
+    b(&return_value_loaded);
+    bind(&load_return_value);
+  }
+  // load value from ReturnValue
+  ldr(r0, MemOperand(fp, return_value_offset*kPointerSize));
+  bind(&return_value_loaded);
   // No more valid handles (the result handle was the last one). Restore
   // previous handle scope.
   str(r4, MemOperand(r7, kNextOffset));
   if (emit_debug_code()) {
     ldr(r1, MemOperand(r7, kLevelOffset));
     cmp(r1, r6);
     Check(eq, "Unexpected level after return from api call");
   }
   sub(r6, r6, Operand(1));
   str(r6, MemOperand(r7, kLevelOffset));
@@ skipping 1524 matching lines @@
 void CodePatcher::EmitCondition(Condition cond) {
   Instr instr = Assembler::instr_at(masm_.pc_);
   instr = (instr & ~kCondMask) | cond;
   masm_.emit(instr);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM