A64: Implement LOsrEntry and LUnknownOSRValue

src/a64/lithium-a64.cc

Index: src/a64/lithium-a64.cc
diff --git a/src/a64/lithium-a64.cc b/src/a64/lithium-a64.cc
index a2071a2608aa1a18ed9889b0e28934ca22fa0033..8313759164ceddf1f2385dd78e5b816342d0b965 100644
--- a/src/a64/lithium-a64.cc
+++ b/src/a64/lithium-a64.cc
@@ -1871,7 +1871,10 @@ LInstruction* LChunkBuilder::DoNumericConstraint(HNumericConstraint* instr) {
 
 
 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);
 }
 
 
@@ -2450,7 +2453,12 @@ LInstruction* LChunkBuilder::DoUnaryMathOperation(HUnaryMathOperation* instr) {
 
 
 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);
 }