[Isolates] Merge crankshaft (r5922 from bleeding_edge).

src/deoptimizer.h

+// Copyright 2010 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
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// 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.
+
+#ifndef V8_DEOPTIMIZER_H_
+#define V8_DEOPTIMIZER_H_
+
+#include "v8.h"
+
+#include "macro-assembler.h"
+#include "zone-inl.h"
+
+
+namespace v8 {
+namespace internal {
+
+class FrameDescription;
+class TranslationIterator;
+class DeoptimizingCodeListNode;
+
+
+class ValueDescription BASE_EMBEDDED {
+ public:
+  explicit ValueDescription(int index) : stack_index_(index) { }
+  int stack_index() const { return stack_index_; }
+
+ private:
+  // Offset relative to the top of the stack.
+  int stack_index_;
+};
+
+
+class ValueDescriptionInteger32: public ValueDescription {
+ public:
+  ValueDescriptionInteger32(int index, int32_t value)
+      : ValueDescription(index), int32_value_(value) { }
+  int32_t int32_value() const { return int32_value_; }
+
+ private:
+  // Raw value.
+  int32_t int32_value_;
+};
+
+
+class ValueDescriptionDouble: public ValueDescription {
+ public:
+  ValueDescriptionDouble(int index, double value)
+      : ValueDescription(index), double_value_(value) { }
+  double double_value() const { return double_value_; }
+
+ private:
+  // Raw value.
+  double double_value_;
+};
+
+
+class OptimizedFunctionVisitor BASE_EMBEDDED {
+ public:
+  virtual ~OptimizedFunctionVisitor() {}
+
+  // Function which is called before iteration of any optimized functions
+  // from given global context.
+  virtual void EnterContext(Context* context) = 0;
+
+  virtual void VisitFunction(JSFunction* function) = 0;
+
+  // Function which is called after iteration of all optimized functions
+  // from given global context.
+  virtual void LeaveContext(Context* context) = 0;
+};
+
+
+class Deoptimizer;
+
+
+class DeoptimizerData {
+ public:
+  DeoptimizerData();
+  ~DeoptimizerData();
+
+ private:
+  LargeObjectChunk* eager_deoptimization_entry_code_;
+  LargeObjectChunk* lazy_deoptimization_entry_code_;
+  Deoptimizer* current_;
+
+  // List of deoptimized code which still have references from active stack
+  // frames. These code objects are needed by the deoptimizer when deoptimizing
+  // a frame for which the code object for the function function has been
+  // changed from the code present when deoptimizing was done.
+  DeoptimizingCodeListNode* deoptimizing_code_list_;
+
+  friend class Deoptimizer;
+
+  DISALLOW_COPY_AND_ASSIGN(DeoptimizerData);
+};
+
+
+class Deoptimizer : public Malloced {
+ public:
+  enum BailoutType {
+    EAGER,
+    LAZY,
+    OSR
+  };
+
+  int output_count() const { return output_count_; }
+
+  static Deoptimizer* New(JSFunction* function,
+                          BailoutType type,
+                          unsigned bailout_id,
+                          Address from,
+                          int fp_to_sp_delta,
+                          Isolate* isolate);
+  static Deoptimizer* Grab(Isolate* isolate);
+
+  // Deoptimize the function now. Its current optimized code will never be run
+  // again and any activations of the optimized code will get deoptimized when
+  // execution returns.
+  static void DeoptimizeFunction(JSFunction* function);
+
+  // Deoptimize all functions in the heap.
+  static void DeoptimizeAll();
+
+  static void DeoptimizeGlobalObject(JSObject* object);
+
+  static void VisitAllOptimizedFunctionsForContext(
+      Context* context, OptimizedFunctionVisitor* visitor);
+
+  static void VisitAllOptimizedFunctionsForGlobalObject(
+      JSObject* object, OptimizedFunctionVisitor* visitor);
+
+  static void VisitAllOptimizedFunctions(OptimizedFunctionVisitor* visitor);
+
+  // Given the relocation info of a call to the stack check stub, patch the
+  // code so as to go unconditionally to the on-stack replacement builtin
+  // instead.
+  static void PatchStackCheckCode(RelocInfo* rinfo, Code* replacement_code);
+
+  // Given the relocation info of a call to the on-stack replacement
+  // builtin, patch the code back to the original stack check code.
+  static void RevertStackCheckCode(RelocInfo* rinfo, Code* check_code);
+
+  ~Deoptimizer();
+
+  void InsertHeapNumberValues(int index, JavaScriptFrame* frame);
+
+  static void ComputeOutputFrames(Deoptimizer* deoptimizer, Isolate* isolate);
+
+  static Address GetDeoptimizationEntry(int id, BailoutType type);
+  static int GetDeoptimizationId(Address addr, BailoutType type);
+  static unsigned GetOutputInfo(DeoptimizationOutputData* data,
+                                unsigned node_id,
+                                SharedFunctionInfo* shared);
+
+  // Code generation support.
+  static int input_offset() { return OFFSET_OF(Deoptimizer, input_); }
+  static int output_count_offset() {
+    return OFFSET_OF(Deoptimizer, output_count_);
+  }
+  static int output_offset() { return OFFSET_OF(Deoptimizer, output_); }
+
+  static int GetDeoptimizedCodeCount(Isolate* isolate);
+
+  static const int kNotDeoptimizationEntry = -1;
+
+  // Generators for the deoptimization entry code.
+  class EntryGenerator BASE_EMBEDDED {
+   public:
+    EntryGenerator(MacroAssembler* masm, BailoutType type)
+        : masm_(masm), type_(type) { }
+    virtual ~EntryGenerator() { }
+
+    void Generate();
+
+   protected:
+    MacroAssembler* masm() const { return masm_; }
+    BailoutType type() const { return type_; }
+
+    virtual void GeneratePrologue() { }
+
+   private:
+    MacroAssembler* masm_;
+    Deoptimizer::BailoutType type_;
+  };
+
+  class TableEntryGenerator : public EntryGenerator {
+   public:
+    TableEntryGenerator(MacroAssembler* masm, BailoutType type,  int count)
+        : EntryGenerator(masm, type), count_(count) { }
+
+   protected:
+    virtual void GeneratePrologue();
+
+   private:
+    int count() const { return count_; }
+
+    int count_;
+  };
+
+ private:
+  static const int kNumberOfEntries = 4096;
+
+  Deoptimizer(Isolate* isolate,
+              JSFunction* function,
+              BailoutType type,
+              unsigned bailout_id,
+              Address from,
+              int fp_to_sp_delta);
+  void DeleteFrameDescriptions();
+
+  void DoComputeOutputFrames();
+  void DoComputeOsrOutputFrame();
+  void DoComputeFrame(TranslationIterator* iterator, int frame_index);
+  void DoTranslateCommand(TranslationIterator* iterator,
+                          int frame_index,
+                          unsigned output_offset);
+  // Translate a command for OSR.  Updates the input offset to be used for
+  // the next command.  Returns false if translation of the command failed
+  // (e.g., a number conversion failed) and may or may not have updated the
+  // input offset.
+  bool DoOsrTranslateCommand(TranslationIterator* iterator,
+                             int* input_offset);
+
+  unsigned ComputeInputFrameSize() const;
+  unsigned ComputeFixedSize(JSFunction* function) const;
+
+  unsigned ComputeIncomingArgumentSize(JSFunction* function) const;
+  unsigned ComputeOutgoingArgumentSize() const;
+
+  Object* ComputeLiteral(int index) const;
+
+  void InsertHeapNumberValue(JavaScriptFrame* frame,
+                             int stack_index,
+                             double val,
+                             int extra_slot_count);
+
+  void AddInteger32Value(int frame_index, int slot_index, int32_t value);
+  void AddDoubleValue(int frame_index, int slot_index, double value);
+
+  static LargeObjectChunk* CreateCode(BailoutType type);
+  static void GenerateDeoptimizationEntries(
+      MacroAssembler* masm, int count, BailoutType type);
+
+  // Weak handle callback for deoptimizing code objects.
+  static void HandleWeakDeoptimizedCode(
+      v8::Persistent<v8::Value> obj, void* data);
+  static Code* FindDeoptimizingCodeFromAddress(Address addr);
+  static void RemoveDeoptimizingCode(Code* code);
+
+  Isolate* isolate_;
+  JSFunction* function_;
+  Code* optimized_code_;
+  unsigned bailout_id_;
+  BailoutType bailout_type_;
+  Address from_;
+  int fp_to_sp_delta_;
+
+  // Input frame description.
+  FrameDescription* input_;
+  // Number of output frames.
+  int output_count_;
+  // Array of output frame descriptions.
+  FrameDescription** output_;
+
+  List<ValueDescriptionInteger32>* integer32_values_;
+  List<ValueDescriptionDouble>* double_values_;
+
+  static int table_entry_size_;
+
+  friend class FrameDescription;
+  friend class DeoptimizingCodeListNode;
+};
+
+
+class FrameDescription {
+ public:
+  FrameDescription(uint32_t frame_size,
+                   JSFunction* function);
+
+  void* operator new(size_t size, uint32_t frame_size) {
+    return malloc(size + frame_size);
+  }
+
+  void operator delete(void* description) {
+    free(description);
+  }
+
+  uint32_t GetFrameSize() const { return frame_size_; }
+
+  JSFunction* GetFunction() const { return function_; }
+
+  unsigned GetOffsetFromSlotIndex(Deoptimizer* deoptimizer, int slot_index);
+
+  uint32_t GetFrameSlot(unsigned offset) {
+    return *GetFrameSlotPointer(offset);
+  }
+
+  double GetDoubleFrameSlot(unsigned offset) {
+    return *reinterpret_cast<double*>(GetFrameSlotPointer(offset));
+  }
+
+  void SetFrameSlot(unsigned offset, uint32_t value) {
+    *GetFrameSlotPointer(offset) = value;
+  }
+
+  uint32_t GetRegister(unsigned n) const {
+    ASSERT(n < ARRAY_SIZE(registers_));
+    return registers_[n];
+  }
+
+  double GetDoubleRegister(unsigned n) const {
+    ASSERT(n < ARRAY_SIZE(double_registers_));
+    return double_registers_[n];
+  }
+
+  void SetRegister(unsigned n, uint32_t value) {
+    ASSERT(n < ARRAY_SIZE(registers_));
+    registers_[n] = value;
+  }
+
+  void SetDoubleRegister(unsigned n, double value) {
+    ASSERT(n < ARRAY_SIZE(double_registers_));
+    double_registers_[n] = value;
+  }
+
+  uint32_t GetTop() const { return top_; }
+  void SetTop(uint32_t top) { top_ = top; }
+
+  uint32_t GetPc() const { return pc_; }
+  void SetPc(uint32_t pc) { pc_ = pc; }
+
+  uint32_t GetFp() const { return fp_; }
+  void SetFp(uint32_t fp) { fp_ = fp; }
+
+  Smi* GetState() const { return state_; }
+  void SetState(Smi* state) { state_ = state; }
+
+  void SetContinuation(uint32_t pc) { continuation_ = pc; }
+
+  static int registers_offset() {
+    return OFFSET_OF(FrameDescription, registers_);
+  }
+
+  static int double_registers_offset() {
+    return OFFSET_OF(FrameDescription, double_registers_);
+  }
+
+  static int frame_size_offset() {
+    return OFFSET_OF(FrameDescription, frame_size_);
+  }
+
+  static int pc_offset() {
+    return OFFSET_OF(FrameDescription, pc_);
+  }
+
+  static int state_offset() {
+    return OFFSET_OF(FrameDescription, state_);
+  }
+
+  static int continuation_offset() {
+    return OFFSET_OF(FrameDescription, continuation_);
+  }
+
+  static int frame_content_offset() {
+    return sizeof(FrameDescription);
+  }
+
+ private:
+  static const uint32_t kZapUint32 = 0xbeeddead;
+
+  uint32_t frame_size_;  // Number of bytes.
+  JSFunction* function_;
+  uint32_t registers_[Register::kNumRegisters];
+  double double_registers_[DoubleRegister::kNumAllocatableRegisters];
+  uint32_t top_;
+  uint32_t pc_;
+  uint32_t fp_;
+  Smi* state_;
+
+  // Continuation is the PC where the execution continues after
+  // deoptimizing.
+  uint32_t continuation_;
+
+  uint32_t* GetFrameSlotPointer(unsigned offset) {
+    ASSERT(offset < frame_size_);
+    return reinterpret_cast<uint32_t*>(
+        reinterpret_cast<Address>(this) + frame_content_offset() + offset);
+  }
+};
+
+
+class TranslationBuffer BASE_EMBEDDED {
+ public:
+  TranslationBuffer() : contents_(256) { }
+
+  int CurrentIndex() const { return contents_.length(); }
+  void Add(int32_t value);
+
+  Handle<ByteArray> CreateByteArray();
+
+ private:
+  ZoneList<uint8_t> contents_;
+};
+
+
+class TranslationIterator BASE_EMBEDDED {
+ public:
+  TranslationIterator(ByteArray* buffer, int index)
+      : buffer_(buffer), index_(index) {
+    ASSERT(index >= 0 && index < buffer->length());
+  }
+
+  int32_t Next();
+
+  bool HasNext() const { return index_ >= 0; }
+
+  void Done() { index_ = -1; }
+
+  void Skip(int n) {
+    for (int i = 0; i < n; i++) Next();
+  }
+
+ private:
+  ByteArray* buffer_;
+  int index_;
+};
+
+
+class Translation BASE_EMBEDDED {
+ public:
+  enum Opcode {
+    BEGIN,
+    FRAME,
+    REGISTER,
+    INT32_REGISTER,
+    DOUBLE_REGISTER,
+    STACK_SLOT,
+    INT32_STACK_SLOT,
+    DOUBLE_STACK_SLOT,
+    LITERAL,
+    ARGUMENTS_OBJECT,
+
+    // A prefix indicating that the next command is a duplicate of the one
+    // that follows it.
+    DUPLICATE
+  };
+
+  Translation(TranslationBuffer* buffer, int frame_count)
+      : buffer_(buffer),
+        index_(buffer->CurrentIndex()) {
+    buffer_->Add(BEGIN);
+    buffer_->Add(frame_count);
+  }
+
+  int index() const { return index_; }
+
+  // Commands.
+  void BeginFrame(int node_id, int literal_id, unsigned height);
+  void StoreRegister(Register reg);
+  void StoreInt32Register(Register reg);
+  void StoreDoubleRegister(DoubleRegister reg);
+  void StoreStackSlot(int index);
+  void StoreInt32StackSlot(int index);
+  void StoreDoubleStackSlot(int index);
+  void StoreLiteral(int literal_id);
+  void StoreArgumentsObject();
+  void MarkDuplicate();
+
+  static int NumberOfOperandsFor(Opcode opcode);
+
+#ifdef DEBUG
+  static const char* StringFor(Opcode opcode);
+#endif
+
+ private:
+  TranslationBuffer* buffer_;
+  int index_;
+};
+
+
+// Linked list holding deoptimizing code objects. The deoptimizing code objects
+// are kept as weak handles until they are no longer activated on the stack.
+class DeoptimizingCodeListNode : public Malloced {
+ public:
+  explicit DeoptimizingCodeListNode(Code* code);
+  ~DeoptimizingCodeListNode();
+
+  DeoptimizingCodeListNode* next() const { return next_; }
+  void set_next(DeoptimizingCodeListNode* next) { next_ = next; }
+  Handle<Code> code() const { return code_; }
+
+ private:
+  // Global (weak) handle to the deoptimizing code object.
+  Handle<Code> code_;
+
+  // Next pointer for linked list.
+  DeoptimizingCodeListNode* next_;
+};
+
+
+} }  // namespace v8::internal
+
+#endif  // V8_DEOPTIMIZER_H_