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

runtime/vm/assembler_mips.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"  // NOLINT
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/assembler.h"
 #include "vm/longjump.h"
 #include "vm/runtime_entry.h"
 #include "vm/simulator.h"
 #include "vm/stack_frame.h"
 #include "vm/stub_code.h"
 
 namespace dart {
 
 #if defined(USING_SIMULATOR)
 DECLARE_FLAG(int, trace_sim_after);
 #endif
+DECLARE_FLAG(bool, allow_absolute_addresses);
 DEFINE_FLAG(bool, print_stop_message, false, "Print stop message.");
 DECLARE_FLAG(bool, inline_alloc);
 
 void Assembler::InitializeMemoryWithBreakpoints(uword data, intptr_t length) {
   ASSERT(Utils::IsAligned(data, 4));
   ASSERT(Utils::IsAligned(length, 4));
   const uword end = data + length;
   while (data < end) {
     *reinterpret_cast<int32_t*>(data) = Instr::kBreakPointInstruction;
     data += 4;
@@ skipping 482 matching lines @@
   // no constant pool is set up (e.g. intrinsic code).
   if (Thread::CanLoadFromThread(object)) {
     lw(rd, Address(THR, Thread::OffsetFromThread(object)));
     return;
   }
   ASSERT(!in_delay_slot_);
   // Smis and VM heap objects are never relocated; do not use object pool.
   if (object.IsSmi()) {
     LoadImmediate(rd, reinterpret_cast<int32_t>(object.raw()));
   } else if (object.InVMHeap() || !constant_pool_allowed()) {
+    ASSERT(FLAG_allow_absolute_addresses);
     // Make sure that class CallPattern is able to decode this load immediate.
     int32_t object_raw = reinterpret_cast<int32_t>(object.raw());
     const uint16_t object_low = Utils::Low16Bits(object_raw);
     const uint16_t object_high = Utils::High16Bits(object_raw);
     lui(rd, Immediate(object_high));
     ori(rd, rd, Immediate(object_low));
   } else {
     // Make sure that class CallPattern is able to decode this load from the
     // object pool.
     const int32_t offset = ObjectPool::element_offset(
@@ skipping 320 matching lines @@
                                       Register temp_reg,
                                       Heap::Space space,
                                       bool inline_isolate) {
   ASSERT(!in_delay_slot_);
   ASSERT(temp_reg != kNoRegister);
   ASSERT(temp_reg != TMP);
   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(
           temp_reg, reinterpret_cast<uword>(*table_ptr) + counter_offset);
     } else {
       ASSERT(temp_reg != kNoRegister);
       LoadImmediate(temp_reg, reinterpret_cast<uword>(table_ptr));
       lw(temp_reg, Address(temp_reg, 0));
       AddImmediate(temp_reg, counter_offset);
@@ skipping 58 matching lines @@
 void Assembler::MaybeTraceAllocation(intptr_t cid,
                                      Register temp_reg,
                                      Label* trace,
                                      bool inline_isolate) {
   ASSERT(cid > 0);
   ASSERT(!in_delay_slot_);
   ASSERT(temp_reg != kNoRegister);
   ASSERT(temp_reg != TMP);
   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));
       lw(temp_reg, Address(temp_reg, 0));
       AddImmediate(temp_reg, state_offset);
     }
@@ skipping 372 matching lines @@
   Label stop;
   b(&stop);
   Emit(reinterpret_cast<int32_t>(message));
   Bind(&stop);
   break_(Instr::kStopMessageCode);
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS