Adds Stop to MIPS. Starts on MIPS call patcher.

runtime/vm/assembler_mips.cc

Index: runtime/vm/assembler_mips.cc
===================================================================
--- runtime/vm/assembler_mips.cc	(revision 20488)
+++ runtime/vm/assembler_mips.cc	(working copy)
@@ -9,7 +9,7 @@
 
 namespace dart {
 
-DEFINE_FLAG(bool, print_stop_message, true, "Print stop message.");
+DEFINE_FLAG(bool, print_stop_message, false, "Print stop message.");
 
 
 void Assembler::InitializeMemoryWithBreakpoints(uword data, int length) {
@@ -56,6 +56,65 @@
   return (((instr & kBranchOffsetMask) << 16) >> 14);
 }
 
+
+void Assembler::LoadWordFromPoolOffset(Register rd, int32_t offset) {
+  ASSERT(rd != PP);
+  if (Address::CanHoldOffset(offset)) {
+    lw(rd, Address(PP, offset));
+  } else {
+    LoadImmediate(rd, offset);
+    addu(rd, rd, PP);
+    lw(rd, Address(rd));

[regis, 2013/03/26 00:49:06]

I think you can do slightly better here, by using the offset in the last
instruction. This could sometimes save one instruction. You can call
LoadImmediate with offset - offset_lo, with offset_lo used in the last
instruction. See ARM for similar code, but remember that the offset is unsigned
on ARM.

[zra, 2013/03/26 17:29:07]

Done.

+  }
+}
+
+
+int32_t Assembler::AddObject(const Object& obj) {
+  ASSERT(obj.IsNotTemporaryScopedHandle());
+  ASSERT(obj.IsOld());
+  if (object_pool_.IsNull()) {
+    // The object pool cannot be used in the vm isolate.
+    ASSERT(Isolate::Current() != Dart::vm_isolate());
+    object_pool_ = GrowableObjectArray::New(Heap::kOld);
+  }
+  for (int i = 0; i < object_pool_.Length(); i++) {
+    if (object_pool_.At(i) == obj.raw()) {
+      return i;
+    }
+  }
+  object_pool_.Add(obj, Heap::kOld);
+  return object_pool_.Length() - 1;
+}
+
+
+int32_t Assembler::AddExternalLabel(const ExternalLabel* label) {
+  if (object_pool_.IsNull()) {
+    // The object pool cannot be used in the vm isolate.
+    ASSERT(Isolate::Current() != Dart::vm_isolate());
+    object_pool_ = GrowableObjectArray::New(Heap::kOld);
+  }
+  const word address = label->address();
+  ASSERT(Utils::IsAligned(address, 4));
+  // The address is stored in the object array as a RawSmi.
+  const Smi& smi = Smi::Handle(Smi::New(address >> kSmiTagShift));
+  // Do not reuse an existing entry, since each reference may be patched
+  // independently.
+  object_pool_.Add(smi, Heap::kOld);
+  return object_pool_.Length() - 1;
+}
+
+
+void Assembler::Stop(const char* message) {
+  if (FLAG_print_stop_message) {
+    UNIMPLEMENTED();
+  }
+  Label stop;
+  b(&stop);
+  Emit(reinterpret_cast<int32_t>(message));
+  Bind(&stop);
+  break_(Instr::kStopMessageCode);
+}
+
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS