Add deoptimization translations.

src/compiler/instruction.h

 // Copyright 2014 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.
 
 #ifndef V8_COMPILER_INSTRUCTION_H_
 #define V8_COMPILER_INSTRUCTION_H_
 
 #include <deque>
 #include <map>
 #include <set>
@@ skipping 676 matching lines @@
   Handle<HeapObject> ToHeapObject() const {
     DCHECK_EQ(kHeapObject, type());
     return BitCast<Handle<HeapObject> >(static_cast<intptr_t>(value_));
   }
 
  private:
   Type type_;
   int64_t value_;
 };
 
+
+class FrameStateDescriptor : public ZoneObject {
+ public:
+  FrameStateDescriptor(BailoutId bailout_id, int parameters_count,
+                       int locals_count, int stack_count)
+      : bailout_id_(bailout_id),
+        parameters_count_(parameters_count),
+        locals_count_(locals_count),
+        stack_count_(stack_count) {}
+
+  BailoutId bailout_id() const { return bailout_id_; }
+  int parameters_count() { return parameters_count_; }
+  int locals_count() { return locals_count_; }
+  int stack_count() { return stack_count_; }
+
+  int size() { return parameters_count_ + locals_count_ + stack_count_; }
+
+ private:
+  BailoutId bailout_id_;
+  int parameters_count_;
+  int locals_count_;
+  int stack_count_;
+};
+
 OStream& operator<<(OStream& os, const Constant& constant);
 
 typedef std::deque<Constant, zone_allocator<Constant> > ConstantDeque;
 typedef std::map<int, Constant, std::less<int>,
                  zone_allocator<std::pair<int, Constant> > > ConstantMap;
 
 
 typedef std::deque<Instruction*, zone_allocator<Instruction*> >
     InstructionDeque;
 typedef std::deque<PointerMap*, zone_allocator<PointerMap*> > PointerMapDeque;
-typedef std::vector<FrameStateDescriptor, zone_allocator<FrameStateDescriptor> >
+typedef std::vector<FrameStateDescriptor*,

[Benedikt Meurer, 2014/08/06 09:41:00]

Why store pointers? FrameStateDescriptor is small, copying is cheap, so using
pointers here just wastes memory. Or am I missing something?

[Jarin, 2014/08/06 10:05:05]

Yeah, at the moment it is four ints. However, with inlining we will add a
pointer to the parent FrameStateDescriptor, so pointers will make the
representation more consistent. If you feel strongly about this, I am fine with
changing back to storing values.

+                    zone_allocator<FrameStateDescriptor*> >
     DeoptimizationVector;
 
 
 // Represents architecture-specific generated code before, during, and after
 // register allocation.
 // TODO(titzer): s/IsDouble/IsFloat64/
 class InstructionSequence V8_FINAL {
  public:
   InstructionSequence(Linkage* linkage, Graph* graph, Schedule* schedule)
       : graph_(graph),
@@ skipping 89 matching lines @@
     int index = static_cast<int>(immediates_.size());
     immediates_.push_back(constant);
     return index;
   }
   Constant GetImmediate(int index) const {
     DCHECK(index >= 0);
     DCHECK(index < static_cast<int>(immediates_.size()));
     return immediates_[index];
   }
 
-  int AddDeoptimizationEntry(const FrameStateDescriptor& descriptor);
-  FrameStateDescriptor GetDeoptimizationEntry(int deoptimization_id);
+  int AddDeoptimizationEntry(FrameStateDescriptor* descriptor);
+  FrameStateDescriptor* GetDeoptimizationEntry(int deoptimization_id);
   int GetDeoptimizationEntryCount();
 
  private:
   friend OStream& operator<<(OStream& os, const InstructionSequence& code);
 
   typedef std::set<int, std::less<int>, ZoneIntAllocator> VirtualRegisterSet;
 
   Graph* graph_;
   Linkage* linkage_;
   Schedule* schedule_;
   ConstantMap constants_;
   ConstantDeque immediates_;
   InstructionDeque instructions_;
   int next_virtual_register_;
   PointerMapDeque pointer_maps_;
   VirtualRegisterSet doubles_;
   VirtualRegisterSet references_;
   Frame frame_;
   DeoptimizationVector deoptimization_entries_;
 };
 
 OStream& operator<<(OStream& os, const InstructionSequence& code);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INSTRUCTION_H_