A64: Implement LOsrEntry and LUnknownOSRValue

src/a64/lithium-a64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // 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
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@@ skipping 1853 matching lines @@
   }
 }
 
 
 LInstruction* LChunkBuilder::DoNumericConstraint(HNumericConstraint* instr) {
   return NULL;
 }
 
 
 LInstruction* LChunkBuilder::DoOsrEntry(HOsrEntry* instr) {
-  UNIMPLEMENTED_INSTRUCTION();
+  ASSERT(argument_count_ == 0);
+  allocator_->MarkAsOsrEntry();
+  current_block_->last_environment()->set_ast_id(instr->ast_id());
+  return AssignEnvironment(new(zone()) LOsrEntry);
 }
 
 
 LInstruction* LChunkBuilder::DoOuterContext(HOuterContext* instr) {
   LOperand* context = UseRegisterAtStart(instr->value());
   return DefineAsRegister(new(zone()) LOuterContext(context));
 }
 
 
 LInstruction* LChunkBuilder::DoParameter(HParameter* instr) {
@@ skipping 558 matching lines @@
       return MarkAsCall(DefineFixedDouble(result, d0), instr);
     }
     default:
       UNREACHABLE();
       return NULL;
   }
 }
 
 
 LInstruction* LChunkBuilder::DoUnknownOSRValue(HUnknownOSRValue* instr) {
-  UNIMPLEMENTED_INSTRUCTION();
+  int spill_index = chunk_->GetNextSpillIndex();
+  if (spill_index > LUnallocated::kMaxFixedSlotIndex) {
+    Abort("Too many spill slots needed for OSR");
+    spill_index = 0;
+  }

[titzer, 2014/01/24 17:04:32]

You will need to define these OSR values in exactly the right spill slot so that
the register allocator maps them to the correct location in the frame. See the
arm port for reference.

+  return DefineAsSpilled(new(zone()) LUnknownOSRValue, spill_index);
 }
 
 
 LInstruction* LChunkBuilder::DoUseConst(HUseConst* instr) {
   return NULL;
 }
 
 
 LInstruction* LChunkBuilder::DoValueOf(HValueOf* instr) {
   LOperand* object = UseRegister(instr->value());
@@ skipping 35 matching lines @@
 LInstruction* LChunkBuilder::DoWrapReceiver(HWrapReceiver* instr) {
   LOperand* receiver = UseRegister(instr->receiver());
   LOperand* function = UseRegisterAtStart(instr->function());
   LOperand* temp = TempRegister();
   LWrapReceiver* result = new(zone()) LWrapReceiver(receiver, function, temp);
   return AssignEnvironment(DefineAsRegister(result));
 }
 
 
 } }  // namespace v8::internal