Add runtime and native entry tags

runtime/vm/stub_code_ia32.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/assembler.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
@@ skipping 52 matching lines @@
     // Check that we are always entering from Dart code.
     __ movl(EAX, Address(CTX, Isolate::vm_tag_offset()));
     __ cmpl(EAX, Immediate(VMTag::kScriptTagId));
     __ j(EQUAL, &ok, Assembler::kNearJump);
     __ Stop("Not coming from Dart code.");
     __ Bind(&ok);
   }
 #endif
 
   // Mark that the isolate is executing VM code.
-  __ movl(Address(CTX, Isolate::vm_tag_offset()), Immediate(VMTag::kVMTagId));
+  __ movl(Address(CTX, Isolate::vm_tag_offset()), ECX);
 
   // Reserve space for arguments and align frame before entering C++ world.
   __ AddImmediate(ESP, Immediate(-sizeof(NativeArguments)));
   if (OS::ActivationFrameAlignment() > 1) {
     __ andl(ESP, Immediate(~(OS::ActivationFrameAlignment() - 1)));
   }
 
   // Pass NativeArguments structure by value and call runtime.
   __ movl(Address(ESP, isolate_offset), CTX);  // Set isolate in NativeArgs.
   // There are no runtime calls to closures, so we do not need to set the tag
@@ skipping 87 matching lines @@
     // Check that we are always entering from Dart code.
     __ movl(EDI, Address(CTX, Isolate::vm_tag_offset()));
     __ cmpl(EDI, Immediate(VMTag::kScriptTagId));
     __ j(EQUAL, &ok, Assembler::kNearJump);
     __ Stop("Not coming from Dart code.");
     __ Bind(&ok);
   }
 #endif
 
   // Mark that the isolate is executing Native code.
-  __ movl(Address(CTX, Isolate::vm_tag_offset()),
-          Immediate(VMTag::kRuntimeNativeTagId));
+  __ movl(Address(CTX, Isolate::vm_tag_offset()), ECX);
 
   // Reserve space for the native arguments structure, the outgoing parameters
   // (pointer to the native arguments structure, the C function entry point)
   // and align frame before entering the C++ world.
   __ AddImmediate(ESP, Immediate(-sizeof(NativeArguments) - (2 * kWordSize)));
   if (OS::ActivationFrameAlignment() > 1) {
     __ andl(ESP, Immediate(~(OS::ActivationFrameAlignment() - 1)));
   }
 
   // Pass NativeArguments structure by value and call native function.
@@ skipping 78 matching lines @@
     // Check that we are always entering from Dart code.
     __ movl(EDI, Address(CTX, Isolate::vm_tag_offset()));
     __ cmpl(EDI, Immediate(VMTag::kScriptTagId));
     __ j(EQUAL, &ok, Assembler::kNearJump);
     __ Stop("Not coming from Dart code.");
     __ Bind(&ok);
   }
 #endif
 
   // Mark that the isolate is executing Native code.
-  __ movl(Address(CTX, Isolate::vm_tag_offset()),
-          Immediate(VMTag::kRuntimeNativeTagId));
+  __ movl(Address(CTX, Isolate::vm_tag_offset()), ECX);
 
   // Reserve space for the native arguments structure, the outgoing parameter
   // (pointer to the native arguments structure) and align frame before
   // entering the C++ world.
   __ AddImmediate(ESP, Immediate(-sizeof(NativeArguments) - kWordSize));
   if (OS::ActivationFrameAlignment() > 1) {
     __ andl(ESP, Immediate(~(OS::ActivationFrameAlignment() - 1)));
   }
 
   // Pass NativeArguments structure by value and call native function.
@@ skipping 1571 matching lines @@
   const Register temp = ECX;
   __ movl(left, Address(ESP, 2 * kWordSize));
   __ movl(right, Address(ESP, 1 * kWordSize));
   GenerateIdenticalWithNumberCheckStub(assembler, left, right, temp);
   __ ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32