VM: Share some stub code between isolates.

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 1326 matching lines @@
     __ cmpl(EBX, Immediate(num_args));
     __ j(EQUAL, &ok, Assembler::kNearJump);
     __ Stop("Incorrect stub for IC data");
     __ Bind(&ok);
   }
 #endif  // DEBUG
 
   Label stepping, done_stepping;
   if (FLAG_support_debugger && !optimized) {
     __ Comment("Check single stepping");
-    uword single_step_address = reinterpret_cast<uword>(Isolate::Current()) +
-        Isolate::single_step_offset();
-    __ cmpb(Address::Absolute(single_step_address), Immediate(0));
+    __ LoadIsolate(EAX);
+    __ cmpb(Address(EAX, Isolate::single_step_offset()), Immediate(0));
     __ j(NOT_EQUAL, &stepping);
     __ Bind(&done_stepping);
   }
   __ Comment("Range feedback collection");
   Label not_smi_or_overflow;
   if (range_collection_mode == kCollectRanges) {
     ASSERT((num_args == 1) || (num_args == 2));
     if (num_args == 2) {
       __ movl(EAX, Address(ESP, + 2 * kWordSize));
       __ UpdateRangeFeedback(EAX, 0, ECX, EBX, EDI, EDX, &not_smi_or_overflow);
@@ skipping 279 matching lines @@
     __ andl(EBX, Immediate(ICData::NumArgsTestedMask()));
     __ cmpl(EBX, Immediate(0));
     __ j(EQUAL, &ok, Assembler::kNearJump);
     __ Stop("Incorrect IC data for unoptimized static call");
     __ Bind(&ok);
   }
 #endif  // DEBUG
   // Check single stepping.
   Label stepping, done_stepping;
   if (FLAG_support_debugger) {
-    uword single_step_address = reinterpret_cast<uword>(Isolate::Current()) +
-        Isolate::single_step_offset();
-    __ cmpb(Address::Absolute(single_step_address), Immediate(0));
+    __ LoadIsolate(EAX);
+    __ cmpb(Address(EAX, Isolate::single_step_offset()), Immediate(0));
     __ j(NOT_EQUAL, &stepping, Assembler::kNearJump);
     __ Bind(&done_stepping);
   }
 
   // ECX: IC data object (preserved).
   __ movl(EBX, FieldAddress(ECX, ICData::ic_data_offset()));
   // EBX: ic_data_array with entries: target functions and count.
   __ leal(EBX, FieldAddress(EBX, Array::data_offset()));
   // EBX: points directly to the first ic data array element.
   const intptr_t target_offset = ICData::TargetIndexFor(0) * kWordSize;
@@ skipping 462 matching lines @@
 //  EBX: entry point.
 void StubCode::GenerateMegamorphicLookupStub(Assembler* assembler) {
   EmitMegamorphicLookup(assembler, EDI, EBX, EBX);
   __ ret();
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32