Moves the top_ and end_ words of the Scavenger into mutator thread.

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 602 matching lines @@
   // EDX is Smi.
   __ leal(EBX, Address(EDX, TIMES_2, fixed_size_plus_alignment_padding));
   ASSERT(kSmiTagShift == 1);
   __ andl(EBX, Immediate(-kObjectAlignment));
 
   // ECX: array element type.
   // EDX: array length as Smi.
   // EBX: allocation size.
 
   const intptr_t cid = kArrayCid;
-  Heap::Space space = Heap::kNew;
-  __ movl(EDI, Address(THR, Thread::heap_offset()));
-  __ movl(EAX, Address(EDI, Heap::TopOffset(space)));
+  NOT_IN_PRODUCT(Heap::Space space = Heap::kNew);
+  __ movl(EAX, Address(THR, Thread::top_offset()));
   __ addl(EBX, EAX);
   __ j(CARRY, &slow_case);
 
   // Check if the allocation fits into the remaining space.
   // EAX: potential new object start.
   // EBX: potential next object start.
-  // EDI: heap.
   // ECX: array element type.
   // EDX: array length as Smi).
-  __ cmpl(EBX, Address(EDI, Heap::EndOffset(space)));
+  __ cmpl(EBX, Address(THR, Thread::end_offset()));
   __ j(ABOVE_EQUAL, &slow_case);
 
   // Successfully allocated the object(s), now update top to point to
   // next object start and initialize the object.
-  __ movl(Address(EDI, Heap::TopOffset(space)), EBX);
+  __ movl(Address(THR, Thread::top_offset()), EBX);
   __ subl(EBX, EAX);
   __ addl(EAX, Immediate(kHeapObjectTag));
   NOT_IN_PRODUCT(__ UpdateAllocationStatsWithSize(cid, EBX, EDI, space));
 
   // Initialize the tags.
   // EAX: new object start as a tagged pointer.
   // EBX: allocation size.
   // ECX: array element type.
   // EDX: array length as Smi.
   {
@@ skipping 189 matching lines @@
         (sizeof(RawContext) + kObjectAlignment - 1);
     __ leal(EBX, Address(EDX, TIMES_4, fixed_size_plus_alignment_padding));
     __ andl(EBX, Immediate(-kObjectAlignment));
 
     NOT_IN_PRODUCT(__ MaybeTraceAllocation(kContextCid, EAX, &slow_case,
                                            Assembler::kFarJump));
 
     // Now allocate the object.
     // EDX: number of context variables.
     const intptr_t cid = kContextCid;
-    Heap::Space space = Heap::kNew;
-    __ movl(ECX, Address(THR, Thread::heap_offset()));
-    __ movl(EAX, Address(ECX, Heap::TopOffset(space)));
+    NOT_IN_PRODUCT(Heap::Space space = Heap::kNew);
+    __ movl(EAX, Address(THR, Thread::top_offset()));
     __ addl(EBX, EAX);
     // Check if the allocation fits into the remaining space.
     // EAX: potential new object.
     // EBX: potential next object start.
     // EDX: number of context variables.
-    __ cmpl(EBX, Address(ECX, Heap::EndOffset(space)));
+    __ cmpl(EBX, Address(THR, Thread::end_offset()));
     if (FLAG_use_slow_path) {
       __ jmp(&slow_case);
     } else {
 #if defined(DEBUG)
       static const bool kJumpLength = Assembler::kFarJump;
 #else
       static const bool kJumpLength = Assembler::kNearJump;
 #endif  // DEBUG
       __ j(ABOVE_EQUAL, &slow_case, kJumpLength);
     }
 
     // Successfully allocated the object, now update top to point to
     // next object start and initialize the object.
     // EAX: new object.
     // EBX: next object start.
     // EDX: number of context variables.
-    __ movl(Address(ECX, Heap::TopOffset(space)), EBX);
+    __ movl(Address(THR, Thread::top_offset()), EBX);
     // EBX: Size of allocation in bytes.
     __ subl(EBX, EAX);
     __ addl(EAX, Immediate(kHeapObjectTag));
     // Generate isolate-independent code to allow sharing between isolates.
     NOT_IN_PRODUCT(__ UpdateAllocationStatsWithSize(cid, EBX, EDI, space));
 
     // Calculate the size tag.
     // EAX: new object.
     // EDX: number of context variables.
     {
@@ skipping 164 matching lines @@
     __ movl(EDX, Address(ESP, kObjectTypeArgumentsOffset));
     // EDX: instantiated type arguments.
   }
   Isolate* isolate = Isolate::Current();
   if (FLAG_inline_alloc && Heap::IsAllocatableInNewSpace(instance_size) &&
       !cls.TraceAllocation(isolate)) {
     Label slow_case;
     // Allocate the object and update top to point to
     // next object start and initialize the allocated object.
     // EDX: instantiated type arguments (if is_cls_parameterized).
-    Heap::Space space = Heap::kNew;
-    __ movl(EDI, Address(THR, Thread::heap_offset()));
-    __ movl(EAX, Address(EDI, Heap::TopOffset(space)));
+    NOT_IN_PRODUCT(Heap::Space space = Heap::kNew);
+    __ movl(EAX, Address(THR, Thread::top_offset()));
     __ leal(EBX, Address(EAX, instance_size));
     // Check if the allocation fits into the remaining space.
     // EAX: potential new object start.
     // EBX: potential next object start.
-    // EDI: heap.
-    __ cmpl(EBX, Address(EDI, Heap::EndOffset(space)));
+    __ cmpl(EBX, Address(THR, Thread::end_offset()));
     if (FLAG_use_slow_path) {
       __ jmp(&slow_case);
     } else {
       __ j(ABOVE_EQUAL, &slow_case);
     }
-    __ movl(Address(EDI, Heap::TopOffset(space)), EBX);
+    __ movl(Address(THR, Thread::top_offset()), EBX);
     NOT_IN_PRODUCT(__ UpdateAllocationStats(cls.id(), ECX, space));
 
     // EAX: new object start (untagged).
     // EBX: next object start.
     // EDX: new object type arguments (if is_cls_parameterized).
     // Set the tags.
     uint32_t tags = 0;
     tags = RawObject::SizeTag::update(instance_size, tags);
     ASSERT(cls.id() != kIllegalCid);
     tags = RawObject::ClassIdTag::update(cls.id(), tags);
@@ skipping 1051 matching lines @@
 }
 
 
 void StubCode::GenerateAsynchronousGapMarkerStub(Assembler* assembler) {
   __ int3();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32