Initial support for debugger frame state in Turbofan.

src/compiler/code-generator.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/pipeline.h"
 
@@ skipping 215 matching lines @@
   for (int i = 0; i < patch_count; ++i) {
     LazyDeoptimizationEntry entry = lazy_deoptimization_entries_[i];
     data->SetReturnAddressPc(i, Smi::FromInt(entry.position_after_call()));
     data->SetPatchedAddressPc(i, Smi::FromInt(entry.deoptimization()->pos()));
   }
 
   code_object->set_deoptimization_data(*data);
 }
 
 
+void CodeGenerator::AddSafepointAndDeopt(Instruction* instr) {
+  CallDescriptor::DeoptimizationSupport deopt =
+      static_cast<CallDescriptor::DeoptimizationSupport>(
+          MiscField::decode(instr->opcode()));
+
+  if ((deopt & CallDescriptor::kLazyDeoptimization) != 0) {
+    RecordLazyDeoptimizationEntry(instr);
+  }
+
+  bool needs_frame_state = (deopt & CallDescriptor::kNeedsFrameState) != 0;
+
+  RecordSafepoint(
+      instr->pointer_map(), Safepoint::kSimple, 0,
+      needs_frame_state ? Safepoint::kLazyDeopt : Safepoint::kNoLazyDeopt);
+
+  if ((deopt & CallDescriptor::kNeedsFrameState) != 0) {
+    // If the frame state is present, it starts at argument 1
+    // (just after the code address).
+    InstructionOperandConverter converter(this, instr);
+    // Argument 1 is deoptimization id.
+    int deoptimization_id = converter.ToConstant(instr->InputAt(1)).ToInt32();
+    // The actual frame state values start with argument 2.
+    BuildTranslation(instr, 2, deoptimization_id);
+    safepoints()->RecordLazyDeoptimizationIndex(deoptimization_id);
+  }
+}
+
+
 void CodeGenerator::RecordLazyDeoptimizationEntry(Instruction* instr) {
   InstructionOperandConverter i(this, instr);
 
   Label after_call;
   masm()->bind(&after_call);
 
   // The continuation and deoptimization are the last two inputs:
   BasicBlock* cont_block =
       i.InputBlock(static_cast<int>(instr->InputCount()) - 2);
   BasicBlock* deopt_block =
@@ skipping 11 matching lines @@
   int result = static_cast<int>(deoptimization_literals_.size());
   for (unsigned i = 0; i < deoptimization_literals_.size(); ++i) {
     if (deoptimization_literals_[i].is_identical_to(literal)) return i;
   }
   deoptimization_literals_.push_back(literal);
   return result;
 }
 
 
 void CodeGenerator::BuildTranslation(Instruction* instr,
+                                     int first_argument_index,
                                      int deoptimization_id) {
   // We should build translation only once.
   DCHECK_EQ(NULL, deoptimization_states_[deoptimization_id]);
 
   FrameStateDescriptor* descriptor =
       code()->GetDeoptimizationEntry(deoptimization_id);
   Translation translation(&translations_, 1, 1, zone());
   translation.BeginJSFrame(descriptor->bailout_id(),
                            Translation::kSelfLiteralId,
                            descriptor->size() - descriptor->parameters_count());
 
   for (int i = 0; i < descriptor->size(); i++) {
-    AddTranslationForOperand(&translation, instr, instr->InputAt(i));
+    AddTranslationForOperand(&translation, instr,
+                             instr->InputAt(i + first_argument_index));
   }
 
   deoptimization_states_[deoptimization_id] =
       new (zone()) DeoptimizationState(translation.index());
 }
 
 
 void CodeGenerator::AddTranslationForOperand(Translation* translation,
                                              Instruction* instr,
                                              InstructionOperand* op) {
@@ skipping 70 matching lines @@
 }
 
 
 void CodeGenerator::AddNopForSmiCodeInlining() { UNIMPLEMENTED(); }
 
 #endif  // !V8_TURBOFAN_BACKEND
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8