Mypal/js/src/regexp/regexp-shim.cc

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: set ts=8 sts=2 et sw=2 tw=80:
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

// 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 <iostream>

#include "regexp/regexp-shim.h"
#include "regexp/regexp-stack.h"

namespace v8 {
namespace internal {

void PrintF(const char* format, ...) {
  va_list arguments;
  va_start(arguments, format);
  vprintf(format, arguments);
  va_end(arguments);
}

void PrintF(FILE* out, const char* format, ...) {
  va_list arguments;
  va_start(arguments, format);
  vfprintf(out, format, arguments);
  va_end(arguments);
}

StdoutStream::operator std::ostream&() const { return std::cerr; }

template <typename T>
std::ostream& StdoutStream::operator<<(T t) { return std::cerr << t; }

template std::ostream& StdoutStream::operator<<(char const* c);

// Origin:
// https://github.com/v8/v8/blob/855591a54d160303349a5f0a32fab15825c708d1/src/utils/ostreams.cc#L120-L169
// (This is a hand-simplified version.)
// Writes the given character to the output escaping everything outside
// of printable ASCII range.
std::ostream& operator<<(std::ostream& os, const AsUC16& c) {
  uc16 v = c.value;
  bool isPrint = 0x20 < v && v <= 0x7e;
  char buf[10];
  const char* format = isPrint ? "%c" : (v <= 0xFF) ? "\\x%02x" : "\\u%04x";
  SprintfLiteral(buf, format, v);
  return os << buf;
}
std::ostream& operator<<(std::ostream& os, const AsUC32& c) {
  int32_t v = c.value;
  if (v <= String::kMaxUtf16CodeUnit) {
    return os << AsUC16(v);
  }
  char buf[13];
  SprintfLiteral(buf, "\\u{%06x}", v);
  return os << buf;
}

HandleScope::HandleScope(Isolate* isolate)
  : isolate_(isolate) {
  isolate->openHandleScope(*this);
}

HandleScope::~HandleScope() {
  isolate_->closeHandleScope(level_, non_gc_level_);
}

template <typename T>
Handle<T>::Handle(T object, Isolate* isolate)
    : location_(isolate->getHandleLocation(JS::Value(object))) {}

template Handle<ByteArray>::Handle(ByteArray b, Isolate* isolate);
template Handle<HeapObject>::Handle(JS::Value v, Isolate* isolate);
template Handle<JSRegExp>::Handle(JSRegExp re, Isolate* isolate);
template Handle<String>::Handle(String s, Isolate* isolate);

template <typename T>
Handle<T>::Handle(JS::Value value, Isolate* isolate)
  : location_(isolate->getHandleLocation(value)) {
  T::cast(Object(value)); // Assert that value has the correct type.
}

JS::Value* Isolate::getHandleLocation(JS::Value value) {
  js::AutoEnterOOMUnsafeRegion oomUnsafe;
  if (!handleArena_.Append(value)) {
    oomUnsafe.crash("Irregexp handle allocation");
  }
  return &handleArena_.GetLast();
}

void* Isolate::allocatePseudoHandle(size_t bytes) {
  PseudoHandle<void> ptr;
  ptr.reset(js_malloc(bytes));
  if (!ptr) {
    return nullptr;
  }
  if (!uniquePtrArena_.Append(std::move(ptr))) {
    return nullptr;
  }
  return uniquePtrArena_.GetLast().get();
}

template <typename T>
PseudoHandle<T> Isolate::takeOwnership(void* ptr) {
  for (auto iter = uniquePtrArena_.IterFromLast(); !iter.Done(); iter.Prev()) {
    auto& entry = iter.Get();
    if (entry.get() == ptr) {
      PseudoHandle<T> result;
      result.reset(static_cast<T*>(entry.release()));
      return result;
    }
  }
  MOZ_CRASH("Tried to take ownership of pseudohandle that is not in the arena");
}

PseudoHandle<ByteArrayData> ByteArray::takeOwnership(Isolate* isolate) {
  PseudoHandle<ByteArrayData> result =
    isolate->takeOwnership<ByteArrayData>(value_.toPrivate());
  value_ = JS::PrivateValue(nullptr);
  return result;
}

void Isolate::trace(JSTracer* trc) {
  js::gc::AssertRootMarkingPhase(trc);

  for (auto iter = handleArena_.Iter(); !iter.Done(); iter.Next()) {
    auto& elem = iter.Get();
    JS::GCPolicy<JS::Value>::trace(trc, &elem, "Isolate handle arena");
  }
}

/*static*/ Handle<String> String::Flatten(Isolate* isolate,
                                          Handle<String> string) {
  if (string->IsFlat()) {
    return string;
  }
  js::AutoEnterOOMUnsafeRegion oomUnsafe;
  JSLinearString* linear = string->str()->ensureLinear(isolate->cx());
  if (!linear) {
    oomUnsafe.crash("Irregexp String::Flatten");
  }
  return Handle<String>(JS::StringValue(linear), isolate);
}

// This is only used for trace messages printing the source of a
// regular expression. To keep things simple, we just return an
// empty string and don't print anything.
std::unique_ptr<char[]> String::ToCString() {
  return std::unique_ptr<char[]>();
}

byte* Isolate::top_of_regexp_stack() const {
  return reinterpret_cast<byte*>(regexpStack_->memory_top_address_address());
}

Handle<ByteArray> Isolate::NewByteArray(int length, AllocationType alloc) {
  MOZ_RELEASE_ASSERT(length >= 0);

  js::AutoEnterOOMUnsafeRegion oomUnsafe;

  size_t alloc_size = sizeof(uint32_t) + length;
  ByteArrayData* data =
    static_cast<ByteArrayData*>(allocatePseudoHandle(alloc_size));
  if (!data) {
    oomUnsafe.crash("Irregexp NewByteArray");
  }
  data->length = length;

  return Handle<ByteArray>(JS::PrivateValue(data), this);
}

Handle<FixedArray> Isolate::NewFixedArray(int length) {
  MOZ_RELEASE_ASSERT(length >= 0);
  MOZ_CRASH("TODO");
}

template <typename CharT>
Handle<String> Isolate::InternalizeString(const Vector<const CharT>& str) {
  js::AutoEnterOOMUnsafeRegion oomUnsafe;
  JSAtom* atom = js::AtomizeChars(cx(), str.begin(), str.length());
  if (!atom) {
    oomUnsafe.crash("Irregexp InternalizeString");
  }
  return Handle<String>(JS::StringValue(atom), this);
}

template Handle<String>
Isolate::InternalizeString(const Vector<const uint8_t>& str);
template Handle<String>
Isolate::InternalizeString(const Vector<const char16_t>& str);

// TODO: Map flags to jitoptions
bool FLAG_correctness_fuzzer_suppressions = false;
bool FLAG_enable_regexp_unaligned_accesses = false;
bool FLAG_harmony_regexp_sequence = false;
bool FLAG_regexp_interpret_all = false;
bool FLAG_regexp_mode_modifiers = false;
bool FLAG_regexp_optimization = true;
bool FLAG_regexp_peephole_optimization = true;
bool FLAG_regexp_possessive_quantifier = false;
bool FLAG_regexp_tier_up = false;
bool FLAG_trace_regexp_assembler = false;
bool FLAG_trace_regexp_bytecodes = false;
bool FLAG_trace_regexp_parser = false;
bool FLAG_trace_regexp_peephole_optimization = false;

}  // namespace internal
}  // namespace v8