Unify SoftDeoptimize and Deoptimize hydrogen instructions

src/hydrogen.h

 // 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 119 matching lines @@
   void Finish(HControlInstruction* last);
   void FinishExit(HControlInstruction* instruction);
   void Goto(HBasicBlock* block,
             FunctionState* state = NULL,
             bool add_simulate = true);
   void GotoNoSimulate(HBasicBlock* block) {
     Goto(block, NULL, false);
   }
 
   int PredecessorIndexOf(HBasicBlock* predecessor) const;
-  void AddSimulate(BailoutId ast_id,
-                   RemovableSimulate removable = FIXED_SIMULATE) {
-    AddInstruction(CreateSimulate(ast_id, removable));
+  HSimulate* AddSimulate(BailoutId ast_id,
+                         RemovableSimulate removable = FIXED_SIMULATE) {
+    HSimulate* instr = CreateSimulate(ast_id, removable);
+    AddInstruction(instr);
+    return instr;
   }
   void AssignCommonDominator(HBasicBlock* other);
   void AssignLoopSuccessorDominators();
 
-  void FinishExitWithDeoptimization(HDeoptimize::UseEnvironment has_uses) {
-    FinishExit(CreateDeoptimize(has_uses));
-  }
-
   // Add the inlined function exit sequence, adding an HLeaveInlined
   // instruction and updating the bailout environment.
   void AddLeaveInlined(HValue* return_value, FunctionState* state);
 
   // If a target block is tagged as an inline function return, all
   // predecessors should contain the inlined exit sequence:
   //
   // LeaveInlined
   // Simulate (caller's environment)
   // Goto (target block)
@@ skipping 14 matching lines @@
     dominates_loop_successors_ = true;
   }
 
   inline Zone* zone() const;
 
 #ifdef DEBUG
   void Verify();
 #endif
 
  private:
+  friend class HGraphBuilder;
+
   void RegisterPredecessor(HBasicBlock* pred);
   void AddDominatedBlock(HBasicBlock* block);
 
   HSimulate* CreateSimulate(BailoutId ast_id, RemovableSimulate removable);
-  HDeoptimize* CreateDeoptimize(HDeoptimize::UseEnvironment has_uses);
 
   int block_id_;
   HGraph* graph_;
   ZoneList<HPhi*> phis_;
   HInstruction* first_;
   HInstruction* last_;
   HControlInstruction* end_;
   HLoopInformation* loop_information_;
   ZoneList<HBasicBlock*> predecessors_;
   HBasicBlock* dominator_;
@@ skipping 816 matching lines @@
             new(zone()) I(p1, p2, p3, p4, p5, p6, p7)));
   }
 
   template<class I, class P1, class P2, class P3, class P4,
            class P5, class P6, class P7, class P8>
   I* Add(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6, P7 p7, P8 p8) {
     return static_cast<I*>(AddInstruction(
             new(zone()) I(p1, p2, p3, p4, p5, p6, p7, p8)));
   }
 
-  void AddSimulate(BailoutId id,
-                   RemovableSimulate removable = FIXED_SIMULATE);
-
-  HReturn* AddReturn(HValue* value);
-
   void IncrementInNoSideEffectsScope() {
     no_side_effects_scope_count_++;
   }
 
   void DecrementInNoSideEffectsScope() {
     no_side_effects_scope_count_--;
   }
 
  protected:
   virtual bool BuildGraph() = 0;
@@ skipping 70 matching lines @@
       Representation representation = Representation::Tagged());
 
   HStoreNamedField* AddStoreMapConstant(HValue *object, Handle<Map>);
 
   HLoadNamedField* AddLoadElements(HValue *object, HValue *typecheck = NULL);
 
   HLoadNamedField* AddLoadFixedArrayLength(HValue *object);
 
   HValue* AddLoadJSBuiltin(Builtins::JavaScript builtin, HValue* context);
 
-  enum SoftDeoptimizeMode {
-    MUST_EMIT_SOFT_DEOPT,
-    CAN_OMIT_SOFT_DEOPT
-  };
-
-  void AddSoftDeoptimize(SoftDeoptimizeMode mode = CAN_OMIT_SOFT_DEOPT);
+  void FinishExitWithHardDeoptimization(HBasicBlock* continuation);
 
   class IfBuilder {
    public:
     explicit IfBuilder(HGraphBuilder* builder,
                        int position = RelocInfo::kNoPosition);
     IfBuilder(HGraphBuilder* builder,
               HIfContinuation* continuation);
 
     ~IfBuilder() {
       if (!finished_) End();
@@ skipping 84 matching lines @@
     void CaptureContinuation(HIfContinuation* continuation);
 
     void Then();
     void Else();
     void End();
 
     void Deopt();
     void ElseDeopt() {
       Else();
       Deopt();
-      End();
     }
 
     void Return(HValue* value);
 
    private:
     void AddCompare(HControlInstruction* compare);
 
     Zone* zone() { return builder_->zone(); }
 
     HGraphBuilder* builder_;
     int position_;
     bool finished_ : 1;
+    bool deopt_then_ : 1;
+    bool deopt_else_ : 1;
     bool did_then_ : 1;
     bool did_else_ : 1;
     bool did_and_ : 1;
     bool did_or_ : 1;
     bool captured_ : 1;
     bool needs_compare_ : 1;
     HBasicBlock* first_true_block_;
     HBasicBlock* last_true_block_;
     HBasicBlock* first_false_block_;
     HBasicBlock* split_edge_merge_block_;
@@ skipping 161 matching lines @@
 
   HValue* BuildCreateAllocationMemento(HValue* previous_object,
                                        int previous_object_size,
                                        HValue* payload);
 
   HInstruction* BuildGetNativeContext(HValue* context);
   HInstruction* BuildGetArrayFunction(HValue* context);
 
  private:
   HGraphBuilder();
+
+  void PadEnvironmentForContinuation(HBasicBlock* from,
+                                     HBasicBlock* continuation);
+
   CompilationInfo* info_;
   HGraph* graph_;
   HBasicBlock* current_block_;
   int no_side_effects_scope_count_;
 };
 
+
+template<>
+inline HDeoptimize* HGraphBuilder::Add(Deoptimizer::BailoutType type) {
+  if (type == Deoptimizer::SOFT) {
+    isolate()->counters()->soft_deopts_requested()->Increment();
+    if (FLAG_always_opt) return NULL;
+  }
+  if (current_block()->IsDeoptimizing()) return NULL;
+  HDeoptimize* instr = new(zone()) HDeoptimize(type);
+  AddInstruction(instr);
+  if (type == Deoptimizer::SOFT) {
+    isolate()->counters()->soft_deopts_inserted()->Increment();
+    graph()->set_has_soft_deoptimize(true);
+  }
+  current_block()->MarkAsDeoptimizing();
+  return instr;
+}
+
+
+template<>
+inline HSimulate* HGraphBuilder::Add(BailoutId id,
+                                     RemovableSimulate removable) {
+  HSimulate* instr = current_block()->CreateSimulate(id, removable);
+  AddInstruction(instr);
+  return instr;
+}
+
+
+template<>
+inline HSimulate* HGraphBuilder::Add(BailoutId id) {
+  return Add<HSimulate>(id, FIXED_SIMULATE);
+}
+
+
+template<>
+inline HReturn* HGraphBuilder::Add(HValue* value) {
+  HValue* context = environment()->LookupContext();
+  int num_parameters = graph()->info()->num_parameters();
+  HValue* params = Add<HConstant>(num_parameters);
+  HReturn* return_instruction = new(graph()->zone())
+      HReturn(value, context, params);
+  current_block()->FinishExit(return_instruction);
+  return return_instruction;
+}
+
+
+template<>
+inline HReturn* HGraphBuilder::Add(HConstant* p1) {
+  return Add<HReturn>(static_cast<HValue*>(p1));
+}
+
+
 class HOptimizedGraphBuilder: public HGraphBuilder, public AstVisitor {
  public:
   // A class encapsulating (lazily-allocated) break and continue blocks for
   // a breakable statement.  Separated from BreakAndContinueScope so that it
   // can have a separate lifetime.
   class BreakAndContinueInfo BASE_EMBEDDED {
    public:
     explicit BreakAndContinueInfo(BreakableStatement* target,
                                   int drop_extra = 0)
         : target_(target),
@@ skipping 654 matching lines @@
   EmbeddedVector<char, 64> filename_;
   HeapStringAllocator string_allocator_;
   StringStream trace_;
   int indent_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_