Remove remaining uses of null's absolute address from non-IA32.

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"
 #include "vm/runtime_entry.h"
 #include "vm/simulator.h"
 #include "vm/stack_frame.h"
 #include "vm/stub_code.h"
 
 // An extra check since we are assuming the existence of /proc/cpuinfo below.
 #if !defined(USING_SIMULATOR) && !defined(__linux__) && !defined(ANDROID)
 #error ARM64 cross-compile only supported on Linux
 #endif
 
 namespace dart {
 
+DECLARE_FLAG(bool, allow_absolute_addresses);
 DEFINE_FLAG(bool, use_far_branches, false, "Always use far branches");
 DEFINE_FLAG(bool, print_stop_message, false, "Print stop message.");
 DECLARE_FLAG(bool, inline_alloc);
 
 
 Assembler::Assembler(bool use_far_branches)
     : buffer_(),
       prologue_offset_(-1),
       use_far_branches_(use_far_branches),
       comments_(),
@@ skipping 390 matching lines @@
                                  bool is_unique) {
   if (Thread::CanLoadFromThread(object)) {
     ldr(dst, Address(THR, Thread::OffsetFromThread(object)));
   } else if (CanLoadFromObjectPool(object)) {
     const int32_t offset = ObjectPool::element_offset(
         is_unique ? object_pool_wrapper_.AddObject(object)
                   : object_pool_wrapper_.FindObject(object));
     LoadWordFromPoolOffset(dst, offset);
   } else {
     ASSERT(object.IsSmi() || object.InVMHeap());
+    ASSERT(object.IsSmi() || FLAG_allow_absolute_addresses);
     LoadDecodableImmediate(dst, reinterpret_cast<int64_t>(object.raw()));
   }
 }
 
 
 void Assembler::LoadFunctionFromCalleePool(Register dst,
                                            const Function& function,
                                            Register new_pp) {
   ASSERT(!constant_pool_allowed());
   ASSERT(new_pp != PP);
@@ skipping 15 matching lines @@
 
 
 void Assembler::CompareObject(Register reg, const Object& object) {
   if (Thread::CanLoadFromThread(object)) {
     ldr(TMP, Address(THR, Thread::OffsetFromThread(object)));
     CompareRegisters(reg, TMP);
   } else if (CanLoadFromObjectPool(object)) {
     LoadObject(TMP, object);
     CompareRegisters(reg, TMP);
   } else {
+    ASSERT(object.IsSmi() || FLAG_allow_absolute_addresses);
     CompareImmediate(reg, reinterpret_cast<int64_t>(object.raw()));
   }
 }
 
 
 void Assembler::LoadDecodableImmediate(Register reg, int64_t imm) {
   if (constant_pool_allowed()) {
     const int32_t offset = ObjectPool::element_offset(FindImmediate(imm));
     LoadWordFromPoolOffset(reg, offset);
   } else {
@@ skipping 768 matching lines @@
 }
 
 
 void Assembler::UpdateAllocationStats(intptr_t cid,
                                       Heap::Space space,
                                       bool inline_isolate) {
   ASSERT(cid > 0);
   intptr_t counter_offset =
       ClassTable::CounterOffsetFor(cid, space == Heap::kNew);
   if (inline_isolate) {
+    ASSERT(FLAG_allow_absolute_addresses);
     ClassTable* class_table = Isolate::Current()->class_table();
     ClassHeapStats** table_ptr = class_table->TableAddressFor(cid);
     if (cid < kNumPredefinedCids) {
       LoadImmediate(
           TMP2, reinterpret_cast<uword>(*table_ptr) + counter_offset);
     } else {
       LoadImmediate(TMP2, reinterpret_cast<uword>(table_ptr));
       ldr(TMP, Address(TMP2));
       AddImmediate(TMP2, TMP, counter_offset);
     }
@@ skipping 49 matching lines @@
 }
 
 
 void Assembler::MaybeTraceAllocation(intptr_t cid,
                                      Register temp_reg,
                                      Label* trace,
                                      bool inline_isolate) {
   ASSERT(cid > 0);
   intptr_t state_offset = ClassTable::StateOffsetFor(cid);
   if (inline_isolate) {
+    ASSERT(FLAG_allow_absolute_addresses);
     ClassTable* class_table = Isolate::Current()->class_table();
     ClassHeapStats** table_ptr = class_table->TableAddressFor(cid);
     if (cid < kNumPredefinedCids) {
       LoadImmediate(
           temp_reg, reinterpret_cast<uword>(*table_ptr) + state_offset);
     } else {
       LoadImmediate(temp_reg, reinterpret_cast<uword>(table_ptr));
       ldr(temp_reg, Address(temp_reg, 0));
       AddImmediate(temp_reg, temp_reg, state_offset);
     }
@@ skipping 138 matching lines @@
     add(base, array, Operand(index, LSL, shift));
   }
   const OperandSize size = Address::OperandSizeFor(cid);
   ASSERT(Address::CanHoldOffset(offset, Address::Offset, size));
   return Address(base, offset, Address::Offset, size);
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64