A64: Synchronize with r16599.

src/a64/lithium-a64.cc

 // Copyright 2013 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 12 matching lines @@
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "v8.h"
 
 #include "lithium-allocator-inl.h"
 #include "a64/lithium-a64.h"
 #include "a64/lithium-codegen-a64.h"
+#include "hydrogen-osr.h"
 
 namespace v8 {
 namespace internal {
 
 
 #define DEFINE_COMPILE(type)                            \
   void L##type::CompileToNative(LCodeGen* generator) {  \
     generator->Do##type(this);                          \
   }
 LITHIUM_CONCRETE_INSTRUCTION_LIST(DEFINE_COMPILE)
@@ skipping 542 matching lines @@
   ASSERT(operand->HasFixedPolicy());
   return operand;
 }
 
 
 LPlatformChunk* LChunkBuilder::Build() {
   ASSERT(is_unused());
   chunk_ = new(zone_) LPlatformChunk(info_, graph_);
   LPhase phase("L_Building chunk", chunk_);
   status_ = BUILDING;
+
+  // If compiling for OSR, reserve space for the unoptimized frame,
+  // which will be subsumed into this frame.
+  if (graph()->has_osr()) {
+    // TODO(all): GetNextSpillIndex just increments a field. It has no other
+    // side effects, so we should get rid of this loop.
+    for (int i = graph()->osr()->UnoptimizedFrameSlots(); i > 0; i--) {
+      chunk_->GetNextSpillIndex();
+    }
+  }
+
   const ZoneList<HBasicBlock*>* blocks = graph_->blocks();
   for (int i = 0; i < blocks->length(); i++) {
     DoBasicBlock(blocks->at(i));
     if (is_aborted()) return NULL;
   }
   status_ = DONE;
   return chunk_;
 }
 
 
@@ skipping 1850 matching lines @@
       return MarkAsCall(DefineFixedDouble(result, d0), instr);
     }
     default:
       UNREACHABLE();
       return NULL;
   }
 }
 
 
 LInstruction* LChunkBuilder::DoUnknownOSRValue(HUnknownOSRValue* instr) {
-  int spill_index = chunk_->GetNextSpillIndex();
-  if (spill_index > LUnallocated::kMaxFixedSlotIndex) {
-    Abort(kTooManySpillSlotsNeededForOSR);
-    spill_index = 0;
+  // Use an index that corresponds to the location in the unoptimized frame,
+  // which the optimized frame will subsume.
+  int env_index = instr->index();
+  int spill_index = 0;
+  if (instr->environment()->is_parameter_index(env_index)) {
+    spill_index = chunk_->GetParameterStackSlot(env_index);
+  } else {
+    spill_index = env_index - instr->environment()->first_local_index();
+    if (spill_index > LUnallocated::kMaxFixedSlotIndex) {
+      Abort(kTooManySpillSlotsNeededForOSR);
+      spill_index = 0;
+    }
   }
   return DefineAsSpilled(new(zone()) LUnknownOSRValue, spill_index);
 }
 
 
 LInstruction* LChunkBuilder::DoUseConst(HUseConst* instr) {
   return NULL;
 }
 
 
@@ skipping 37 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