Allow bailing out of the register allocator when running out of virtual registers.

src/arm/lithium-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 653 matching lines @@
       ? chunk_->DefineConstantOperand(HConstant::cast(value))
       :  Use(value, new LUnallocated(LUnallocated::ANY));
 }
 
 
 LOperand* LChunkBuilder::Use(HValue* value, LUnallocated* operand) {
   if (value->EmitAtUses()) {
     HInstruction* instr = HInstruction::cast(value);
     VisitInstruction(instr);
   }
-  allocator_->RecordUse(value, operand);
+  operand->set_virtual_register(value->id());
   return operand;
 }
 
 
 template<int I, int T>
 LInstruction* LChunkBuilder::Define(LTemplateInstruction<1, I, T>* instr,
                                     LUnallocated* result) {
-  allocator_->RecordDefinition(current_instruction_, result);
+  result->set_virtual_register(current_instruction_->id());
   instr->set_result(result);
   return instr;
 }
 
 
 template<int I, int T>
 LInstruction* LChunkBuilder::DefineAsRegister(
     LTemplateInstruction<1, I, T>* instr) {
   return Define(instr, new LUnallocated(LUnallocated::MUST_HAVE_REGISTER));
 }
@@ skipping 91 matching lines @@
 
 LInstruction* LChunkBuilder::AssignPointerMap(LInstruction* instr) {
   ASSERT(!instr->HasPointerMap());
   instr->set_pointer_map(new LPointerMap(position_));
   return instr;
 }
 
 
 LUnallocated* LChunkBuilder::TempRegister() {
   LUnallocated* operand = new LUnallocated(LUnallocated::MUST_HAVE_REGISTER);
-  allocator_->RecordTemporary(operand);
+  operand->set_virtual_register(allocator_->GetVirtualRegister());
+  if (!allocator_->AllocationOk()) Abort("Not enough virtual registers.");
   return operand;
 }
 
 
 LOperand* LChunkBuilder::FixedTemp(Register reg) {
   LUnallocated* operand = ToUnallocated(reg);
-  allocator_->RecordTemporary(operand);
+  ASSERT(operand->HasFixedPolicy());
   return operand;
 }
 
 
 LOperand* LChunkBuilder::FixedTemp(DoubleRegister reg) {
   LUnallocated* operand = ToUnallocated(reg);
-  allocator_->RecordTemporary(operand);
+  ASSERT(operand->HasFixedPolicy());
   return operand;
 }
 
 
 LInstruction* LChunkBuilder::DoBlockEntry(HBlockEntry* instr) {
   return new LLabel(instr->block());
 }
 
 
 LInstruction* LChunkBuilder::DoSoftDeoptimize(HSoftDeoptimize* instr) {
@@ skipping 1438 matching lines @@
 
 LInstruction* LChunkBuilder::DoIn(HIn* instr) {
   LOperand* key = UseRegisterAtStart(instr->key());
   LOperand* object = UseRegisterAtStart(instr->object());
   LIn* result = new LIn(key, object);
   return MarkAsCall(DefineFixed(result, r0), instr);
 }
 
 
 } }  // namespace v8::internal