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

runtime/vm/assembler_arm64.cc

 // Copyright (c) 2014, 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"  // NOLINT
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/assembler.h"
 #include "vm/cpu.h"
 #include "vm/longjump.h"
@@ skipping 1326 matching lines @@
                             Register instance_reg,
                             Register temp_reg) {
   ASSERT(failure != NULL);
   if (FLAG_inline_alloc) {
     // If this allocation is traced, program will jump to failure path
     // (i.e. the allocation stub) which will allocate the object and trace the
     // allocation call site.
     NOT_IN_PRODUCT(MaybeTraceAllocation(cls.id(), temp_reg, failure));
     const intptr_t instance_size = cls.instance_size();
     Heap::Space space = Heap::kNew;
-    ldr(temp_reg, Address(THR, Thread::heap_offset()));
-    ldr(instance_reg, Address(temp_reg, Heap::TopOffset(space)));
+    ldr(instance_reg, Address(THR, Thread::top_offset()));
     // TODO(koda): Protect against unsigned overflow here.
     AddImmediateSetFlags(instance_reg, instance_reg, instance_size);
 
     // instance_reg: potential next object start.
-    ldr(TMP, Address(temp_reg, Heap::EndOffset(space)));
+    ldr(TMP, Address(THR, Thread::end_offset()));
     CompareRegisters(TMP, instance_reg);
     // fail if heap end unsigned less than or equal to instance_reg.
     b(failure, LS);
 
     // Successfully allocated the object, now update top to point to
     // next object start and store the class in the class field of object.
-    str(instance_reg, Address(temp_reg, Heap::TopOffset(space)));
+    str(instance_reg, Address(THR, Thread::top_offset()));
 
     ASSERT(instance_size >= kHeapObjectTag);
     AddImmediate(instance_reg, -instance_size + kHeapObjectTag);
     NOT_IN_PRODUCT(UpdateAllocationStats(cls.id(), space));
 
     uint32_t tags = 0;
     tags = RawObject::SizeTag::update(instance_size, tags);
     ASSERT(cls.id() != kIllegalCid);
     tags = RawObject::ClassIdTag::update(cls.id(), tags);
     // Extends the 32 bit tags with zeros, which is the uninitialized
@@ skipping 12 matching lines @@
                                  Register instance,
                                  Register end_address,
                                  Register temp1,
                                  Register temp2) {
   if (FLAG_inline_alloc) {
     // If this allocation is traced, program will jump to failure path
     // (i.e. the allocation stub) which will allocate the object and trace the
     // allocation call site.
     NOT_IN_PRODUCT(MaybeTraceAllocation(cid, temp1, failure));
     Heap::Space space = Heap::kNew;
-    ldr(temp1, Address(THR, Thread::heap_offset()));
     // Potential new object start.
-    ldr(instance, Address(temp1, Heap::TopOffset(space)));
+    ldr(instance, Address(THR, Thread::top_offset()));
     AddImmediateSetFlags(end_address, instance, instance_size);
     b(failure, CS);  // Fail on unsigned overflow.
 
     // Check if the allocation fits into the remaining space.
     // instance: potential new object start.
     // end_address: potential next object start.
-    ldr(temp2, Address(temp1, Heap::EndOffset(space)));
+    ldr(temp2, Address(THR, Thread::end_offset()));
     cmp(end_address, Operand(temp2));
     b(failure, CS);
 
     // Successfully allocated the object(s), now update top to point to
     // next object start and initialize the object.
-    str(end_address, Address(temp1, Heap::TopOffset(space)));
+    str(end_address, Address(THR, Thread::top_offset()));
     add(instance, instance, Operand(kHeapObjectTag));
     LoadImmediate(temp2, instance_size);
     NOT_IN_PRODUCT(UpdateAllocationStatsWithSize(cid, temp2, space));
 
     // Initialize the tags.
     // instance: new object start as a tagged pointer.
     uint32_t tags = 0;
     tags = RawObject::ClassIdTag::update(cid, tags);
     tags = RawObject::SizeTag::update(instance_size, tags);
     // Extends the 32 bit tags with zeros, which is the uninitialized
@@ skipping 156 matching lines @@
   str(tmp, Address(addr, 7), kUnsignedByte);
   if (sz == kDoubleWord) {
     return;
   }
   UNIMPLEMENTED();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64