VM: Load allocation-top and -end via Thread.

runtime/vm/stub_code_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"
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/assembler.h"
 #include "vm/code_generator.h"
 #include "vm/compiler.h"
@@ skipping 1090 matching lines @@
   if (is_cls_parameterized) {
     __ ldr(R1, Address(SP));
     // R1: instantiated type arguments.
   }
   if (FLAG_inline_alloc && Heap::IsAllocatableInNewSpace(instance_size) &&
       !cls.trace_allocation()) {
     Label slow_case;
     // Allocate the object and update top to point to
     // next object start and initialize the allocated object.
     // R1: instantiated type arguments (if is_cls_parameterized).
-    Heap* heap = Isolate::Current()->heap();
     Heap::Space space = Heap::SpaceForAllocation(cls.id());
-    __ LoadImmediate(R5, heap->TopAddress(space), kNoPP);
-    __ ldr(R2, Address(R5));
+    __ ldr(R5, Address(THR, Thread::heap_offset()));
+    __ ldr(R2, Address(R5, Heap::TopOffset(space)));
     __ AddImmediate(R3, R2, instance_size, kNoPP);
     // Check if the allocation fits into the remaining space.
     // R2: potential new object start.
     // R3: potential next object start.
-    __ LoadImmediate(TMP, heap->EndAddress(space), kNoPP);
-    __ ldr(TMP, Address(TMP));
+    // R5: heap.
+    __ ldr(TMP, Address(R5, Heap::EndOffset(space)));
     __ CompareRegisters(R3, TMP);
     if (FLAG_use_slow_path) {
       __ b(&slow_case);
     } else {
       __ b(&slow_case, CS);  // Unsigned higher or equal.
     }
-    __ str(R3, Address(R5));
-    __ UpdateAllocationStats(cls.id(), kNoPP, space);
+    __ str(R3, Address(R5, Heap::TopOffset(space)));
+    __ UpdateAllocationStats(cls.id(), kNoPP, space,
+                             /* inline_isolate = */ false);
 
     // R2: new object start.
     // R3: next object start.
     // R1: new object type arguments (if is_cls_parameterized).
     // Set the tags.
     uword tags = 0;
     tags = RawObject::SizeTag::update(instance_size, tags);
     ASSERT(cls.id() != kIllegalCid);
     tags = RawObject::ClassIdTag::update(cls.id(), tags);
     __ LoadImmediate(R0, tags, kNoPP);
@@ skipping 1018 matching lines @@
 // Result:
 //  R1: entry point.
 void StubCode::GenerateMegamorphicLookupStub(Assembler* assembler) {
   EmitMegamorphicLookup(assembler, R0, R1, R1);
   __ ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64