regexp-bytecodes.cc

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// Copyright 2019 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.
 
#include "src/regexp/regexp-bytecodes.h"
 
#include <cctype>
 
#include "src/utils/utils.h"
 
namespace v8 {
namespace internal {
 
void RegExpBytecodeDisassembleSingle(const uint8_t* code_base,
                                     const uint8_t* pc) {
  int bytecode = *reinterpret_cast<const int32_t*>(pc) & BYTECODE_MASK;
  PrintF("%s", RegExpBytecodeName(bytecode));
 
  // Args and the bytecode as hex.
  for (int i = 0; i < RegExpBytecodeLength(bytecode); i++) {
    PrintF(", %02x", pc[i]);
  }
  PrintF(" ");
 
  // Args as ascii.
  for (int i = 1; i < RegExpBytecodeLength(bytecode); i++) {
    unsigned char b = pc[i];
    PrintF("%c", std::isprint(b) ? b : '.');
  }
  PrintF("\n");
}
 
void RegExpBytecodeDisassemble(const uint8_t* code_base, int length,
                               const char* pattern) {
  PrintF("[generated bytecode for regexp pattern: '%s']\n", pattern);
 
  ptrdiff_t offset = 0;
 
  while (offset < length) {
    const uint8_t* const pc = code_base + offset;
    PrintF("%p  %4" V8PRIxPTRDIFF "  ", pc, offset);
    RegExpBytecodeDisassembleSingle(code_base, pc);
    offset += RegExpBytecodeLength(*pc);
  }
}
 
}  // namespace internal
}  // namespace v8