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/* -*- 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/. */
#include "util/StringBuffer.h"
#include "mozilla/Latin1.h"
#include "mozilla/Range.h"
#include "mozilla/Unused.h"
#include <algorithm>
#include "frontend/ParserAtom.h" // frontend::ParserAtom, frontend::ParserAtomsTable
#include "js/friend/ErrorMessages.h" // js::GetErrorMessage, JSMSG_*
#include "vm/JSObject-inl.h"
#include "vm/StringType-inl.h"
using namespace js;
template <typename CharT, class Buffer>
static CharT* ExtractWellSized(Buffer& cb) {
size_t capacity = cb.capacity();
size_t length = cb.length();
StringBufferAllocPolicy allocPolicy = cb.allocPolicy();
CharT* buf = cb.extractOrCopyRawBuffer();
if (!buf) {
return nullptr;
}
/* For medium/big buffers, avoid wasting more than 1/4 of the memory. */
MOZ_ASSERT(capacity >= length);
if (length > Buffer::sMaxInlineStorage && capacity - length > length / 4) {
CharT* tmp = allocPolicy.pod_realloc<CharT>(buf, capacity, length + 1);
if (!tmp) {
allocPolicy.free_(buf);
return nullptr;
}
buf = tmp;
}
return buf;
}
char16_t* StringBuffer::stealChars() {
if (isLatin1() && !inflateChars()) {
return nullptr;
}
return ExtractWellSized<char16_t>(twoByteChars());
}
bool StringBuffer::inflateChars() {
MOZ_ASSERT(isLatin1());
TwoByteCharBuffer twoByte(StringBufferAllocPolicy{cx_, arenaId_});
/*
* Note: we don't use Vector::capacity() because it always returns a
* value >= sInlineCapacity. Since Latin1CharBuffer::sInlineCapacity >
* TwoByteCharBuffer::sInlineCapacitychars, we'd always malloc here.
*/
size_t capacity = std::max(reserved_, latin1Chars().length());
if (!twoByte.reserve(capacity)) {
return false;
}
twoByte.infallibleGrowByUninitialized(latin1Chars().length());
mozilla::ConvertLatin1toUtf16(mozilla::AsChars(latin1Chars()), twoByte);
cb.destroy();
cb.construct<TwoByteCharBuffer>(std::move(twoByte));
return true;
}
bool StringBuffer::append(const frontend::ParserAtom* ent) {
if (isLatin1()) {
if (ent->hasLatin1Chars()) {
return latin1Chars().append(ent->latin1Chars(), ent->length());
}
if (!inflateChars()) {
return false;
}
}
return ent->hasLatin1Chars()
? twoByteChars().append(ent->latin1Chars(), ent->length())
: twoByteChars().append(ent->twoByteChars(), ent->length());
}
template <typename CharT>
JSLinearString* StringBuffer::finishStringInternal(JSContext* cx) {
size_t len = length();
if (JSAtom* staticStr = cx->staticStrings().lookup(begin<CharT>(), len)) {
return staticStr;
}
if (JSInlineString::lengthFits<CharT>(len)) {
mozilla::Range<const CharT> range(begin<CharT>(), len);
return NewInlineString<CanGC>(cx, range);
}
UniquePtr<CharT[], JS::FreePolicy> buf(
ExtractWellSized<CharT>(chars<CharT>()));
if (!buf) {
return nullptr;
}
JSLinearString* str = NewStringDontDeflate<CanGC>(cx, std::move(buf), len);
if (!str) {
return nullptr;
}
return str;
}
JSLinearString* JSStringBuilder::finishString() {
size_t len = length();
if (len == 0) {
return cx_->names().empty;
}
if (!JSString::validateLength(cx_, len)) {
return nullptr;
}
static_assert(JSFatInlineString::MAX_LENGTH_TWO_BYTE <
TwoByteCharBuffer::InlineLength);
static_assert(JSFatInlineString::MAX_LENGTH_LATIN1 <
Latin1CharBuffer::InlineLength);
return isLatin1() ? finishStringInternal<Latin1Char>(cx_)
: finishStringInternal<char16_t>(cx_);
}
JSAtom* StringBuffer::finishAtom() {
size_t len = length();
if (len == 0) {
return cx_->names().empty;
}
if (isLatin1()) {
JSAtom* atom = AtomizeChars(cx_, latin1Chars().begin(), len);
latin1Chars().clear();
return atom;
}
JSAtom* atom = AtomizeChars(cx_, twoByteChars().begin(), len);
twoByteChars().clear();
return atom;
}
const frontend::ParserAtom* StringBuffer::finishParserAtom(
frontend::ParserAtomsTable& parserAtoms) {
size_t len = length();
if (len == 0) {
return cx_->parserNames().empty;
}
if (isLatin1()) {
const frontend::ParserAtom* result =
parserAtoms.internLatin1(cx_, latin1Chars().begin(), len);
if (!result) {
return nullptr;
}
latin1Chars().clear();
return result;
}
const frontend::ParserAtom* result =
parserAtoms.internChar16(cx_, twoByteChars().begin(), len);
if (!result) {
return nullptr;
}
twoByteChars().clear();
return result;
}
bool js::ValueToStringBufferSlow(JSContext* cx, const Value& arg,
StringBuffer& sb) {
RootedValue v(cx, arg);
if (!ToPrimitive(cx, JSTYPE_STRING, &v)) {
return false;
}
if (v.isString()) {
return sb.append(v.toString());
}
if (v.isNumber()) {
return NumberValueToStringBuffer(cx, v, sb);
}
if (v.isBoolean()) {
return BooleanToStringBuffer(v.toBoolean(), sb);
}
if (v.isNull()) {
return sb.append(cx->names().null);
}
if (v.isSymbol()) {
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
JSMSG_SYMBOL_TO_STRING);
return false;
}
if (v.isBigInt()) {
RootedBigInt i(cx, v.toBigInt());
JSLinearString* str = BigInt::toString<CanGC>(cx, i, 10);
if (!str) {
return false;
}
return sb.append(str);
}
MOZ_ASSERT(v.isUndefined());
return sb.append(cx->names().undefined);
}
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