Port irregexp bytecode compiler and interpreter from V8 r24065.

runtime/vm/regexp_assembler_bytecode.h

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#ifndef VM_REGEXP_ASSEMBLER_BYTECODE_H_
+#define VM_REGEXP_ASSEMBLER_BYTECODE_H_
+
+#include "vm/object.h"
+#include "vm/regexp_assembler.h"
+
+namespace dart {
+
+class BytecodeRegExpMacroAssembler: public RegExpMacroAssembler {
+ public:
+  // Create an assembler. Instructions and relocation information are emitted
+  // into a buffer, with the instructions starting from the beginning and the
+  // relocation information starting from the end of the buffer. See CodeDesc
+  // for a detailed comment on the layout (globals.h).
+  //
+  // If the provided buffer is NULL, the assembler allocates and grows its own
+  // buffer, and buffer_size determines the initial buffer size. The buffer is
+  // owned by the assembler and deallocated upon destruction of the assembler.
+  //
+  // If the provided buffer is not NULL, the assembler uses the provided buffer
+  // for code generation and assumes its size to be buffer_size. If the buffer
+  // is too small, a fatal error occurs. No deallocation of the buffer is done
+  // upon destruction of the assembler.
+  BytecodeRegExpMacroAssembler(ZoneGrowableArray<uint8_t>* buffer,
+                               Zone* zone);
+  virtual ~BytecodeRegExpMacroAssembler();
+
+  // The byte-code interpreter checks on each push anyway.
+  virtual intptr_t stack_limit_slack() { return 1; }
+  virtual bool CanReadUnaligned() { return false; }
+  virtual void BindBlock(BlockLabel* label);
+  virtual void AdvanceCurrentPosition(intptr_t by);  // Signed cp change.
+  virtual void PopCurrentPosition();
+  virtual void PushCurrentPosition();
+  virtual void Backtrack();
+  virtual void GoTo(BlockLabel* label);
+  virtual void PushBacktrack(BlockLabel* label);
+  virtual bool Succeed();
+  virtual void Fail();
+  virtual void PopRegister(intptr_t register_index);
+  virtual void PushRegister(intptr_t register_index);
+  virtual void AdvanceRegister(intptr_t reg, intptr_t by);  // r[reg] += by.
+  virtual void SetCurrentPositionFromEnd(intptr_t by);
+  virtual void SetRegister(intptr_t register_index, intptr_t to);
+  virtual void WriteCurrentPositionToRegister(intptr_t reg, intptr_t cp_offset);
+  virtual void ClearRegisters(intptr_t reg_from, intptr_t reg_to);
+  virtual void ReadCurrentPositionFromRegister(intptr_t reg);
+  virtual void WriteStackPointerToRegister(intptr_t reg);
+  virtual void ReadStackPointerFromRegister(intptr_t reg);
+  virtual void LoadCurrentCharacter(intptr_t cp_offset,
+                                    BlockLabel* on_end_of_input,
+                                    bool check_bounds = true,
+                                    intptr_t characters = 1);
+  virtual void CheckCharacter(unsigned c, BlockLabel* on_equal);
+  virtual void CheckCharacterAfterAnd(unsigned c,
+                                      unsigned mask,
+                                      BlockLabel* on_equal);
+  virtual void CheckCharacterGT(uint16_t limit, BlockLabel* on_greater);
+  virtual void CheckCharacterLT(uint16_t limit, BlockLabel* on_less);
+  virtual void CheckGreedyLoop(BlockLabel* on_tos_equals_current_position);
+  virtual void CheckAtStart(BlockLabel* on_at_start);
+  virtual void CheckNotAtStart(BlockLabel* on_not_at_start);
+  virtual void CheckNotCharacter(unsigned c, BlockLabel* on_not_equal);
+  virtual void CheckNotCharacterAfterAnd(unsigned c,
+                                         unsigned mask,
+                                         BlockLabel* on_not_equal);
+  virtual void CheckNotCharacterAfterMinusAnd(uint16_t c,
+                                              uint16_t minus,
+                                              uint16_t mask,
+                                              BlockLabel* on_not_equal);
+  virtual void CheckCharacterInRange(uint16_t from,
+                                     uint16_t to,
+                                     BlockLabel* on_in_range);
+  virtual void CheckCharacterNotInRange(uint16_t from,
+                                        uint16_t to,
+                                        BlockLabel* on_not_in_range);
+  virtual void CheckBitInTable(const TypedData& table, BlockLabel* on_bit_set);
+  virtual void CheckNotBackReference(intptr_t start_reg,
+                                     BlockLabel* on_no_match);
+  virtual void CheckNotBackReferenceIgnoreCase(intptr_t start_reg,
+                                               BlockLabel* on_no_match);
+  virtual void IfRegisterLT(intptr_t register_index,
+                            intptr_t comparand,
+                            BlockLabel* if_lt);
+  virtual void IfRegisterGE(intptr_t register_index,
+                            intptr_t comparand,
+                            BlockLabel* if_ge);
+  virtual void IfRegisterEqPos(intptr_t register_index, BlockLabel* if_eq);
+
+  virtual IrregexpImplementation Implementation();
+  // virtual Handle<HeapObject> GetCode(Handle<String> source);
+  RawTypedData* GetBytecode();
+
+  // New
+  virtual bool IsClosed() const {
+    // Added by Dart for the IR version. Bytecode version should never need an
+    // extra goto.
+    return true;
+  }
+  virtual void Print(const char* str)  { UNIMPLEMENTED(); }
+  virtual void PrintBlocks() { UNIMPLEMENTED(); }
+  /////
+
+  static RawInstance* Interpret(const JSRegExp& regexp,
+                                const String& str,
+                                const Smi& start_index,
+                                Zone* zone);
+
+ private:
+  void Expand();
+  // Code and bitmap emission.
+  inline void EmitOrLink(BlockLabel* label);
+  inline void Emit32(uint32_t x);
+  inline void Emit16(uint32_t x);
+  inline void Emit8(uint32_t x);
+  inline void Emit(uint32_t bc, uint32_t arg);
+  // Bytecode buffer.
+  intptr_t length();
+
+  // The buffer into which code and relocation info are generated.
+  ZoneGrowableArray<uint8_t>* buffer_;
+
+  // The program counter.
+  intptr_t pc_;
+
+  BlockLabel backtrack_;
+
+  intptr_t advance_current_start_;
+  intptr_t advance_current_offset_;
+  intptr_t advance_current_end_;
+
+  static const int kInvalidPC = -1;
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(BytecodeRegExpMacroAssembler);
+};
+
+
+}  // namespace dart
+
+#endif  // VM_REGEXP_ASSEMBLER_BYTECODE_H_