src/x64/lithium-x64.h

// Copyright 2011 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
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// 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
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef V8_X64_LITHIUM_X64_H_
#define V8_X64_LITHIUM_X64_H_

#include "hydrogen.h"
#include "lithium-allocator.h"
#include "lithium.h"
#include "safepoint-table.h"

namespace v8 {
namespace internal {

// Forward declarations.
class LCodeGen;
class LEnvironment;
class Translation;

class LInstruction: public ZoneObject {
 public:
  LInstruction() { }
  virtual ~LInstruction() { }

  virtual void PrintTo(StringStream* stream) const { UNIMPLEMENTED(); }
  virtual void PrintDataTo(StringStream* stream) const { }

  // Predicates should be generated by macro as in lithium-ia32.h.
  virtual bool IsLabel() const {
    UNIMPLEMENTED();
    return false;
  }
  virtual bool IsOsrEntry() const {
    UNIMPLEMENTED();
    return false;
  }

  void set_environment(LEnvironment* env) { environment_.set(env); }
  LEnvironment* environment() const { return environment_.get(); }
  bool HasEnvironment() const { return environment_.is_set(); }

  void set_pointer_map(LPointerMap* p) { pointer_map_.set(p); }
  LPointerMap* pointer_map() const { return pointer_map_.get(); }
  bool HasPointerMap() const { return pointer_map_.is_set(); }

  void set_result(LOperand* operand) { result_.set(operand); }
  LOperand* result() const { return result_.get(); }
  bool HasResult() const { return result_.is_set(); }

  void set_hydrogen_value(HValue* value) { hydrogen_value_ = value; }
  HValue* hydrogen_value() const { return hydrogen_value_; }

  void set_deoptimization_environment(LEnvironment* env) {
    deoptimization_environment_.set(env);
  }
  LEnvironment* deoptimization_environment() const {
    return deoptimization_environment_.get();
  }
  bool HasDeoptimizationEnvironment() const {
    return deoptimization_environment_.is_set();
  }

 private:
  SetOncePointer<LEnvironment> environment_;
  SetOncePointer<LPointerMap> pointer_map_;
  SetOncePointer<LOperand> result_;
  HValue* hydrogen_value_;
  SetOncePointer<LEnvironment> deoptimization_environment_;
};


class LParallelMove : public ZoneObject {
 public:
  LParallelMove() : move_operands_(4) { }

  void AddMove(LOperand* from, LOperand* to) {
    UNIMPLEMENTED();
  }

  const ZoneList<LMoveOperands>* move_operands() const {
    UNIMPLEMENTED();
    return NULL;
  }

 private:
  ZoneList<LMoveOperands> move_operands_;
};


class LGap: public LInstruction {
 public:
  explicit LGap(HBasicBlock* block) { }

  HBasicBlock* block() const {
    UNIMPLEMENTED();
    return NULL;
  }

  enum InnerPosition {
    BEFORE,
    START,
    END,
    AFTER,
    FIRST_INNER_POSITION = BEFORE,
    LAST_INNER_POSITION = AFTER
  };

  LParallelMove* GetOrCreateParallelMove(InnerPosition pos) {
    UNIMPLEMENTED();
    return NULL;
  }

  LParallelMove* GetParallelMove(InnerPosition pos)  {
    UNIMPLEMENTED();
    return NULL;
  }

 private:
  LParallelMove* parallel_moves_[LAST_INNER_POSITION + 1];
  HBasicBlock* block_;
};


class LLabel: public LGap {
 public:
  explicit LLabel(HBasicBlock* block) : LGap(block) { }

 private:
  Label label_;
  LLabel* replacement_;
};


class LOsrEntry: public LInstruction {
 public:
  // Function could be generated by a macro as in lithium-ia32.h.
  static LOsrEntry* cast(LInstruction* instr) {
    UNIMPLEMENTED();
    return NULL;
  }

  LOperand** SpilledRegisterArray() {
    UNIMPLEMENTED();
    return NULL;
  }
  LOperand** SpilledDoubleRegisterArray() {
    UNIMPLEMENTED();
    return NULL;
  }

  void MarkSpilledRegister(int allocation_index, LOperand* spill_operand) {
    UNIMPLEMENTED();
  }
  void MarkSpilledDoubleRegister(int allocation_index,
                                 LOperand* spill_operand) {
    UNIMPLEMENTED();
  }

 private:
  // Arrays of spill slot operands for registers with an assigned spill
  // slot, i.e., that must also be restored to the spill slot on OSR entry.
  // NULL if the register has no assigned spill slot.  Indexed by allocation
  // index.
  LOperand* register_spills_[Register::kNumAllocatableRegisters];
  LOperand* double_register_spills_[DoubleRegister::kNumAllocatableRegisters];
};


class LPointerMap: public ZoneObject {
 public:
  explicit LPointerMap(int position)
      : pointer_operands_(8), position_(position), lithium_position_(-1) { }

  int lithium_position() const {
    UNIMPLEMENTED();
    return 0;
  }

  void RecordPointer(LOperand* op) { UNIMPLEMENTED(); }

 private:
  ZoneList<LOperand*> pointer_operands_;
  int position_;
  int lithium_position_;
};


class LEnvironment: public ZoneObject {
 public:
  LEnvironment(Handle<JSFunction> closure,
               int ast_id,
               int parameter_count,
               int argument_count,
               int value_count,
               LEnvironment* outer)
      : closure_(closure),
        arguments_stack_height_(argument_count),
        deoptimization_index_(Safepoint::kNoDeoptimizationIndex),
        translation_index_(-1),
        ast_id_(ast_id),
        parameter_count_(parameter_count),
        values_(value_count),
        representations_(value_count),
        spilled_registers_(NULL),
        spilled_double_registers_(NULL),
        outer_(outer) {
  }

  Handle<JSFunction> closure() const { return closure_; }
  int arguments_stack_height() const { return arguments_stack_height_; }
  int deoptimization_index() const { return deoptimization_index_; }
  int translation_index() const { return translation_index_; }
  int ast_id() const { return ast_id_; }
  int parameter_count() const { return parameter_count_; }
  const ZoneList<LOperand*>* values() const { return &values_; }
  LEnvironment* outer() const { return outer_; }

 private:
  Handle<JSFunction> closure_;
  int arguments_stack_height_;
  int deoptimization_index_;
  int translation_index_;
  int ast_id_;
  int parameter_count_;
  ZoneList<LOperand*> values_;
  ZoneList<Representation> representations_;

  // Allocation index indexed arrays of spill slot operands for registers
  // that are also in spill slots at an OSR entry.  NULL for environments
  // that do not correspond to an OSR entry.
  LOperand** spilled_registers_;
  LOperand** spilled_double_registers_;

  LEnvironment* outer_;
};


class LChunkBuilder;
class LChunk: public ZoneObject {
 public:
  explicit LChunk(HGraph* graph)
    : spill_slot_count_(0),
      graph_(graph),
      instructions_(32),
      pointer_maps_(8),
      inlined_closures_(1) { }

  int spill_slot_count() const { return spill_slot_count_; }
  HGraph* graph() const { return graph_; }
  const ZoneList<LInstruction*>* instructions() const { return &instructions_; }
  const ZoneList<LPointerMap*>* pointer_maps() const { return &pointer_maps_; }
  const ZoneList<Handle<JSFunction> >* inlined_closures() const {
    return &inlined_closures_;
  }

  LOperand* GetNextSpillSlot(bool double_slot) {
    UNIMPLEMENTED();
    return NULL;
  }

  LConstantOperand* DefineConstantOperand(HConstant* constant) {
    UNIMPLEMENTED();
    return NULL;
  }

  LLabel* GetLabel(int block_id) const {
    UNIMPLEMENTED();
    return NULL;
  }

  int GetParameterStackSlot(int index) const {
    UNIMPLEMENTED();
    return 0;
  }

  void AddGapMove(int index, LOperand* from, LOperand* to) { UNIMPLEMENTED(); }

  LGap* GetGapAt(int index) const {
    UNIMPLEMENTED();
    return NULL;
  }

  bool IsGapAt(int index) const {
    UNIMPLEMENTED();
    return false;
  }

  int NearestGapPos(int index) const {
    UNIMPLEMENTED();
    return 0;
  }

  void MarkEmptyBlocks() { UNIMPLEMENTED(); }

#ifdef DEBUG
  void Verify() { }
#endif

 private:
  int spill_slot_count_;
  HGraph* const graph_;
  ZoneList<LInstruction*> instructions_;
  ZoneList<LPointerMap*> pointer_maps_;
  ZoneList<Handle<JSFunction> > inlined_closures_;
};


class LChunkBuilder BASE_EMBEDDED {
 public:
  LChunkBuilder(HGraph* graph, LAllocator* allocator)
      : chunk_(NULL),
        graph_(graph),
        status_(UNUSED),
        current_instruction_(NULL),
        current_block_(NULL),
        next_block_(NULL),
        argument_count_(0),
        allocator_(allocator),
        position_(RelocInfo::kNoPosition),
        instructions_pending_deoptimization_environment_(NULL),
        pending_deoptimization_ast_id_(AstNode::kNoNumber) { }

  // Build the sequence for the graph.
  LChunk* Build();

  // Declare methods that deal with the individual node types.
#define DECLARE_DO(type) LInstruction* Do##type(H##type* node) { \
    UNIMPLEMENTED(); \
    return NULL; \
  }
  HYDROGEN_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
#undef DECLARE_DO

 private:
  enum Status {
    UNUSED,
    BUILDING,
    DONE,
    ABORTED
  };

  LChunk* chunk() const { return chunk_; }
  HGraph* graph() const { return graph_; }

  bool is_unused() const { return status_ == UNUSED; }
  bool is_building() const { return status_ == BUILDING; }
  bool is_done() const { return status_ == DONE; }
  bool is_aborted() const { return status_ == ABORTED; }

  void Abort(const char* format, ...);

  void DoBasicBlock(HBasicBlock* block, HBasicBlock* next_block);

  LChunk* chunk_;
  HGraph* const graph_;
  Status status_;
  HInstruction* current_instruction_;
  HBasicBlock* current_block_;
  HBasicBlock* next_block_;
  int argument_count_;
  LAllocator* allocator_;
  int position_;
  LInstruction* instructions_pending_deoptimization_environment_;
  int pending_deoptimization_ast_id_;

  DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
};


} }  // namespace v8::internal

#endif  // V8_X64_LITHIUM_X64_H_