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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
#include "vm/JSONParser.h"
#include "mozilla/Assertions.h" // MOZ_ASSERT
#include "mozilla/Attributes.h" // MOZ_STACK_CLASS
#include "mozilla/Range.h" // mozilla::Range
#include "mozilla/RangedPtr.h" // mozilla::RangedPtr
#include "mozilla/Sprintf.h" // SprintfLiteral
#include "mozilla/TextUtils.h" // mozilla::AsciiAlphanumericToNumber, mozilla::IsAsciiDigit, mozilla::IsAsciiHexDigit
#include <stddef.h> // size_t
#include <stdint.h> // uint32_t
#include <utility> // std::move
#include "jsnum.h" // ParseDecimalNumber, GetFullInteger, FullStringToDouble
#include "builtin/Array.h" // NewDenseCopiedArray
#include "builtin/ParseRecordObject.h" // js::ParseRecordObject
#include "ds/IdValuePair.h" // IdValuePair
#include "gc/GCEnum.h" // CanGC
#include "gc/Tracer.h" // JS::TraceRoot
#include "js/AllocPolicy.h" // ReportOutOfMemory
#include "js/CharacterEncoding.h" // JS::ConstUTF8CharsZ
#include "js/ColumnNumber.h" // JS::ColumnNumberOneOrigin
#include "js/ErrorReport.h" // JS_ReportErrorNumberASCII
#include "js/friend/ErrorMessages.h" // js::GetErrorMessage, JSMSG_*
#include "js/GCVector.h" // JS::GCVector
#include "js/Id.h" // jsid
#include "js/JSON.h" // JS::IsValidJSON
#include "js/PropertyAndElement.h" // JS_SetPropertyById
#include "js/RootingAPI.h" // JS::Handle, JS::MutableHandle, MutableWrappedPtrOperations
#include "js/TypeDecls.h" // Latin1Char
#include "js/Utility.h" // js_delete
#include "js/Value.h" // JS::Value, JS::BooleanValue, JS::NullValue, JS::NumberValue, JS::StringValue
#include "js/Vector.h" // Vector
#include "util/StringBuilder.h" // JSStringBuilder
#include "vm/ArrayObject.h" // ArrayObject
#include "vm/ErrorReporting.h" // ReportCompileErrorLatin1, ErrorMetadata
#include "vm/JSAtomUtils.h" // AtomizeChars
#include "vm/JSContext.h" // JSContext
#include "vm/PlainObject.h" // NewPlainObjectWithMaybeDuplicateKeys
#include "vm/Realm.h" // JS::Realm
#include "vm/StringType.h" // JSString, JSAtom, JSLinearString, NewStringCopyN, NameToId
#include "vm/JSAtomUtils-inl.h" // AtomToId
using namespace js;
using mozilla::AsciiAlphanumericToNumber;
using mozilla::IsAsciiDigit;
using mozilla::IsAsciiHexDigit;
using mozilla::RangedPtr;
template <typename CharT, typename ParserT>
void JSONTokenizer<CharT, ParserT>::getTextPosition(uint32_t* column,
uint32_t* line) {
CharPtr ptr = begin;
uint32_t col = 1;
uint32_t row = 1;
for (; ptr < current; ptr++) {
if (*ptr == '\n' || *ptr == '\r') {
++row;
col = 1;
// \r\n is treated as a single newline.
if (ptr + 1 < current && *ptr == '\r' && *(ptr + 1) == '\n') {
++ptr;
}
} else {
++col;
}
}
*column = col;
*line = row;
}
static inline bool IsJSONWhitespace(char16_t c) {
return c == '\t' || c == '\r' || c == '\n' || c == ' ';
}
template <typename CharT, typename ParserT>
bool JSONTokenizer<CharT, ParserT>::consumeTrailingWhitespaces() {
for (; current < end; current++) {
if (!IsJSONWhitespace(*current)) {
return false;
}
}
return true;
}
template <typename CharT, typename ParserT>
JSONToken JSONTokenizer<CharT, ParserT>::advance() {
while (current < end && IsJSONWhitespace(*current)) {
current++;
}
if (current >= end) {
error("unexpected end of data");
return token(JSONToken::Error);
}
sourceStart = current;
switch (*current) {
case '"':
return readString<JSONStringType::LiteralValue>();
case '-':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
return readNumber();
case 't':
if (end - current < 4 || current[1] != 'r' || current[2] != 'u' ||
current[3] != 'e') {
error("unexpected keyword");
return token(JSONToken::Error);
}
current += 4;
if (!parser->handler.setBooleanValue(true, getSource())) {
return token(JSONToken::OOM);
}
return token(JSONToken::True);
case 'f':
if (end - current < 5 || current[1] != 'a' || current[2] != 'l' ||
current[3] != 's' || current[4] != 'e') {
error("unexpected keyword");
return token(JSONToken::Error);
}
current += 5;
if (!parser->handler.setBooleanValue(false, getSource())) {
return token(JSONToken::OOM);
}
return token(JSONToken::False);
case 'n':
if (end - current < 4 || current[1] != 'u' || current[2] != 'l' ||
current[3] != 'l') {
error("unexpected keyword");
return token(JSONToken::Error);
}
current += 4;
if (!parser->handler.setNullValue(getSource())) {
return token(JSONToken::OOM);
}
return token(JSONToken::Null);
case '[':
current++;
return token(JSONToken::ArrayOpen);
case ']':
current++;
return token(JSONToken::ArrayClose);
case '{':
current++;
return token(JSONToken::ObjectOpen);
case '}':
current++;
return token(JSONToken::ObjectClose);
case ',':
current++;
return token(JSONToken::Comma);
case ':':
current++;
return token(JSONToken::Colon);
default:
error("unexpected character");
return token(JSONToken::Error);
}
}
template <typename CharT, typename ParserT>
JSONToken JSONTokenizer<CharT, ParserT>::advancePropertyName() {
MOZ_ASSERT(current[-1] == ',');
while (current < end && IsJSONWhitespace(*current)) {
current++;
}
if (current >= end) {
error("end of data when property name was expected");
return token(JSONToken::Error);
}
if (*current == '"') {
return readString<JSONStringType::PropertyName>();
}
error("expected double-quoted property name");
return token(JSONToken::Error);
}
template <typename CharT, typename ParserT>
JSONToken JSONTokenizer<CharT, ParserT>::advancePropertyColon() {
MOZ_ASSERT(current[-1] == '"');
while (current < end && IsJSONWhitespace(*current)) {
current++;
}
if (current >= end) {
error("end of data after property name when ':' was expected");
return token(JSONToken::Error);
}
if (*current == ':') {
current++;
return token(JSONToken::Colon);
}
error("expected ':' after property name in object");
return token(JSONToken::Error);
}
template <typename CharT>
static inline void AssertPastValue(const RangedPtr<const CharT> current) {
/*
* We're past an arbitrary JSON value, so the previous character is
* *somewhat* constrained, even if this assertion is pretty broad. Don't
* knock it till you tried it: this assertion *did* catch a bug once.
*/
MOZ_ASSERT((current[-1] == 'l' && current[-2] == 'l' && current[-3] == 'u' &&
current[-4] == 'n') ||
(current[-1] == 'e' && current[-2] == 'u' && current[-3] == 'r' &&
current[-4] == 't') ||
(current[-1] == 'e' && current[-2] == 's' && current[-3] == 'l' &&
current[-4] == 'a' && current[-5] == 'f') ||
current[-1] == '}' || current[-1] == ']' || current[-1] == '"' ||
IsAsciiDigit(current[-1]));
}
template <typename CharT, typename ParserT>
JSONToken JSONTokenizer<CharT, ParserT>::advanceAfterProperty() {
AssertPastValue(current);
while (current < end && IsJSONWhitespace(*current)) {
current++;
}
if (current >= end) {
error("end of data after property value in object");
return token(JSONToken::Error);
}
if (*current == ',') {
current++;
return token(JSONToken::Comma);
}
if (*current == '}') {
current++;
return token(JSONToken::ObjectClose);
}
error("expected ',' or '}' after property value in object");
return token(JSONToken::Error);
}
template <typename CharT, typename ParserT>
JSONToken JSONTokenizer<CharT, ParserT>::advanceAfterObjectOpen() {
MOZ_ASSERT(current[-1] == '{');
while (current < end && IsJSONWhitespace(*current)) {
current++;
}
if (current >= end) {
error("end of data while reading object contents");
return token(JSONToken::Error);
}
if (*current == '"') {
return readString<JSONStringType::PropertyName>();
}
if (*current == '}') {
current++;
return token(JSONToken::ObjectClose);
}
error("expected property name or '}'");
return token(JSONToken::Error);
}
template <typename CharT, typename ParserT>
JSONToken JSONTokenizer<CharT, ParserT>::advanceAfterArrayElement() {
AssertPastValue(current);
while (current < end && IsJSONWhitespace(*current)) {
current++;
}
if (current >= end) {
error("end of data when ',' or ']' was expected");
return token(JSONToken::Error);
}
if (*current == ',') {
current++;
return token(JSONToken::Comma);
}
if (*current == ']') {
current++;
return token(JSONToken::ArrayClose);
}
error("expected ',' or ']' after array element");
return token(JSONToken::Error);
}
template <typename CharT, typename ParserT>
template <JSONStringType ST>
JSONToken JSONTokenizer<CharT, ParserT>::stringToken(const CharPtr start,
size_t length) {
if (!parser->handler.template setStringValue<ST>(start, length,
getSource())) {
return JSONToken::OOM;
}
return JSONToken::String;
}
template <typename CharT, typename ParserT>
template <JSONStringType ST>
JSONToken JSONTokenizer<CharT, ParserT>::stringToken(
JSONStringBuilder& builder) {
if (!parser->handler.template setStringValue<ST>(builder, getSource())) {
return JSONToken::OOM;
}
return JSONToken::String;
}
template <typename CharT, typename ParserT>
JSONToken JSONTokenizer<CharT, ParserT>::numberToken(double d) {
if (!parser->handler.setNumberValue(d, getSource())) {
return JSONToken::OOM;
}
return JSONToken::Number;
}
template <typename CharT, typename ParserT>
template <JSONStringType ST>
JSONToken JSONTokenizer<CharT, ParserT>::readString() {
MOZ_ASSERT(current < end);
MOZ_ASSERT(*current == '"');
/*
* JSONString:
* /^"([^\u0000-\u001F"\\]|\\(["/\\bfnrt]|u[0-9a-fA-F]{4}))*"$/
*/
if (++current == end) {
error("unterminated string literal");
return token(JSONToken::Error);
}
/*
* Optimization: if the source contains no escaped characters, create the
* string directly from the source text.
*/
CharPtr start = current;
for (; current < end; current++) {
if (*current == '"') {
size_t length = current - start;
current++;
return stringToken<ST>(start, length);
}
if (*current == '\\') {
break;
}
if (*current <= 0x001F) {
error("bad control character in string literal");
return token(JSONToken::Error);
}
}
/*
* Slow case: string contains escaped characters. Copy a maximal sequence
* of unescaped characters into a temporary buffer, then an escaped
* character, and repeat until the entire string is consumed.
*/
JSONStringBuilder builder(parser->handler.context());
do {
if (start < current && !builder.append(start.get(), current.get())) {
return token(JSONToken::OOM);
}
if (current >= end) {
break;
}
char16_t c = *current++;
if (c == '"') {
return stringToken<ST>(builder);
}
if (c != '\\') {
--current;
error("bad character in string literal");
return token(JSONToken::Error);
}
if (current >= end) {
break;
}
switch (*current++) {
case '"':
c = '"';
break;
case '/':
c = '/';
break;
case '\\':
c = '\\';
break;
case 'b':
c = '\b';
break;
case 'f':
c = '\f';
break;
case 'n':
c = '\n';
break;
case 'r':
c = '\r';
break;
case 't':
c = '\t';
break;
case 'u':
if (end - current < 4 ||
!(IsAsciiHexDigit(current[0]) && IsAsciiHexDigit(current[1]) &&
IsAsciiHexDigit(current[2]) && IsAsciiHexDigit(current[3]))) {
// Point to the first non-hexadecimal character (which may be
// missing).
if (current == end || !IsAsciiHexDigit(current[0])) {
; // already at correct location
} else if (current + 1 == end || !IsAsciiHexDigit(current[1])) {
current += 1;
} else if (current + 2 == end || !IsAsciiHexDigit(current[2])) {
current += 2;
} else if (current + 3 == end || !IsAsciiHexDigit(current[3])) {
current += 3;
} else {
MOZ_CRASH("logic error determining first erroneous character");
}
error("bad Unicode escape");
return token(JSONToken::Error);
}
c = (AsciiAlphanumericToNumber(current[0]) << 12) |
(AsciiAlphanumericToNumber(current[1]) << 8) |
(AsciiAlphanumericToNumber(current[2]) << 4) |
(AsciiAlphanumericToNumber(current[3]));
current += 4;
break;
default:
current--;
error("bad escaped character");
return token(JSONToken::Error);
}
if (!builder.append(c)) {
return token(JSONToken::OOM);
}
start = current;
for (; current < end; current++) {
if (*current == '"' || *current == '\\' || *current <= 0x001F) {
break;
}
}
} while (current < end);
error("unterminated string");
return token(JSONToken::Error);
}
template <typename CharT, typename ParserT>
JSONToken JSONTokenizer<CharT, ParserT>::readNumber() {
MOZ_ASSERT(current < end);
MOZ_ASSERT(IsAsciiDigit(*current) || *current == '-');
/*
* JSONNumber:
* /^-?(0|[1-9][0-9]+)(\.[0-9]+)?([eE][\+\-]?[0-9]+)?$/
*/
bool negative = *current == '-';
/* -? */
if (negative && ++current == end) {
error("no number after minus sign");
return token(JSONToken::Error);
}
const CharPtr digitStart = current;
/* 0|[1-9][0-9]+ */
if (!IsAsciiDigit(*current)) {
error("unexpected non-digit");
return token(JSONToken::Error);
}
if (*current++ != '0') {
for (; current < end; current++) {
if (!IsAsciiDigit(*current)) {
break;
}
}
}
/* Fast path: no fractional or exponent part. */
if (current == end ||
(*current != '.' && *current != 'e' && *current != 'E')) {
mozilla::Range<const CharT> chars(digitStart.get(), current - digitStart);
if (chars.length() < strlen("9007199254740992")) {
// If the decimal number is shorter than the length of 2**53, (the
// largest number a double can represent with integral precision),
// parse it using a decimal-only parser. This comparison is
// conservative but faster than a fully-precise check.
double d = ParseDecimalNumber(chars);
return numberToken(negative ? -d : d);
}
double d;
if (!GetFullInteger(digitStart.get(), current.get(), 10,
IntegerSeparatorHandling::None, &d)) {
parser->outOfMemory();
return token(JSONToken::OOM);
}
return numberToken(negative ? -d : d);
}
/* (\.[0-9]+)? */
if (current < end && *current == '.') {
if (++current == end) {
error("missing digits after decimal point");
return token(JSONToken::Error);
}
if (!IsAsciiDigit(*current)) {
error("unterminated fractional number");
return token(JSONToken::Error);
}
while (++current < end) {
if (!IsAsciiDigit(*current)) {
break;
}
}
}
/* ([eE][\+\-]?[0-9]+)? */
if (current < end && (*current == 'e' || *current == 'E')) {
if (++current == end) {
error("missing digits after exponent indicator");
return token(JSONToken::Error);
}
if (*current == '+' || *current == '-') {
if (++current == end) {
error("missing digits after exponent sign");
return token(JSONToken::Error);
}
}
if (!IsAsciiDigit(*current)) {
error("exponent part is missing a number");
return token(JSONToken::Error);
}
while (++current < end) {
if (!IsAsciiDigit(*current)) {
break;
}
}
}
double d = FullStringToDouble(digitStart.get(), current.get());
return numberToken(negative ? -d : d);
}
template <typename CharT, typename ParserT>
void JSONTokenizer<CharT, ParserT>::error(const char* msg) {
parser->error(msg);
}
static void ReportJSONSyntaxError(FrontendContext* fc, ErrorMetadata&& metadata,
unsigned errorNumber, ...) {
va_list args;
va_start(args, errorNumber);
js::ReportCompileErrorLatin1VA(fc, std::move(metadata), nullptr, errorNumber,
&args);
va_end(args);
}
// JSONFullParseHandlerAnyChar uses an AutoSelectGCHeap to switch to allocating
// in the tenured heap if we trigger more than one nursery collection.
//
// JSON parsing allocates from the leaves of the tree upwards (unlike
// structured clone deserialization which works from the root
// downwards). Because of this it doesn't necessarily make sense to stop
// nursery allocation after the first collection as this doesn't doom the
// whole data structure to being tenured. We don't know ahead of time how
// big the resulting data structure will be but after two nursery
// collections then at least half of it will end up tenured.
JSONFullParseHandlerAnyChar::JSONFullParseHandlerAnyChar(JSContext* cx)
: cx(cx), gcHeap(cx, 1), freeElements(cx), freeProperties(cx) {}
JSONFullParseHandlerAnyChar::JSONFullParseHandlerAnyChar(
JSONFullParseHandlerAnyChar&& other) noexcept
: cx(other.cx),
v(other.v),
parseType(other.parseType),
gcHeap(cx, 1),
freeElements(std::move(other.freeElements)),
freeProperties(std::move(other.freeProperties)) {}
JSONFullParseHandlerAnyChar::~JSONFullParseHandlerAnyChar() {
for (size_t i = 0; i < freeElements.length(); i++) {
js_delete(freeElements[i]);
}
for (size_t i = 0; i < freeProperties.length(); i++) {
js_delete(freeProperties[i]);
}
}
inline bool JSONFullParseHandlerAnyChar::objectOpen(
Vector<StackEntry, 10>& stack, PropertyVector** properties) {
if (!freeProperties.empty()) {
*properties = freeProperties.popCopy();
(*properties)->clear();
} else {
(*properties) = cx->new_<PropertyVector>(cx);
if (!*properties) {
return false;
}
}
if (!stack.append(StackEntry(cx, *properties))) {
js_delete(*properties);
return false;
}
return true;
}
inline bool JSONFullParseHandlerAnyChar::objectPropertyName(
Vector<StackEntry, 10>& stack, bool* isProtoInEval) {
*isProtoInEval = false;
jsid id = AtomToId(atomValue());
if (parseType == ParseType::AttemptForEval) {
// In |JSON.parse|, "__proto__" is a property like any other and may
// appear multiple times. In object literal syntax, "__proto__" is
// prototype mutation and can appear at most once. |JSONParser| only
// supports the former semantics, so if this parse attempt is for
// |eval|, return true (without reporting an error) to indicate the
// JSON parse attempt was unsuccessful.
if (id == NameToId(cx->names().proto_)) {
*isProtoInEval = true;
return true;
}
}
PropertyVector& properties = stack.back().properties();
if (!properties.emplaceBack(id)) {
return false;
}
return true;
}
inline bool JSONFullParseHandlerAnyChar::finishObjectMember(
Vector<StackEntry, 10>& stack, JS::Handle<JS::Value> value,
PropertyVector** properties) {
*properties = &stack.back().properties();
(*properties)->back().value = value;
return true;
}
inline bool JSONFullParseHandlerAnyChar::finishObject(
Vector<StackEntry, 10>& stack, JS::MutableHandle<JS::Value> vp,
PropertyVector* properties) {
MOZ_ASSERT(properties == &stack.back().properties());
NewObjectKind newKind = GenericObject;
if (gcHeap == gc::Heap::Tenured) {
newKind = TenuredObject;
}
// properties is traced in the parser; see JSONParser<CharT>::trace()
JSObject* obj = NewPlainObjectWithMaybeDuplicateKeys(
cx, Handle<IdValueVector>::fromMarkedLocation(properties), newKind);
if (!obj) {
return false;
}
vp.setObject(*obj);
if (!freeProperties.append(properties)) {
return false;
}
stack.popBack();
return true;
}
inline bool JSONFullParseHandlerAnyChar::arrayOpen(
Vector<StackEntry, 10>& stack, ElementVector** elements) {
if (!freeElements.empty()) {
*elements = freeElements.popCopy();
(*elements)->clear();
} else {
(*elements) = cx->new_<ElementVector>(cx);
if (!*elements) {
return false;
}
}
if (!stack.append(StackEntry(cx, *elements))) {
js_delete(*elements);
return false;
}
return true;
}
inline bool JSONFullParseHandlerAnyChar::arrayElement(
Vector<StackEntry, 10>& stack, JS::Handle<JS::Value> value,
ElementVector** elements) {
*elements = &stack.back().elements();
return (*elements)->append(value.get());
}
inline bool JSONFullParseHandlerAnyChar::finishArray(
Vector<StackEntry, 10>& stack, JS::MutableHandle<JS::Value> vp,
ElementVector* elements) {
MOZ_ASSERT(elements == &stack.back().elements());
NewObjectKind newKind = GenericObject;
if (gcHeap == gc::Heap::Tenured) {
newKind = TenuredObject;
}
ArrayObject* obj =
NewDenseCopiedArray(cx, elements->length(), elements->begin(), newKind);
if (!obj) {
return false;
}
vp.setObject(*obj);
if (!freeElements.append(elements)) {
return false;
}
stack.popBack();
return true;
}
inline void JSONFullParseHandlerAnyChar::freeStackEntry(StackEntry& entry) {
if (entry.state == JSONParserState::FinishArrayElement) {
js_delete(&entry.elements());
} else {
js_delete(&entry.properties());
}
}
void JSONFullParseHandlerAnyChar::trace(JSTracer* trc) {
JS::TraceRoot(trc, &v, "JSONFullParseHandlerAnyChar current value");
}
template <typename CharT>
bool JSONFullParseHandler<CharT>::JSONStringBuilder::append(char16_t c) {
return buffer.append(c);
}
template <typename CharT>
bool JSONFullParseHandler<CharT>::JSONStringBuilder::append(const CharT* begin,
const CharT* end) {
return buffer.append(begin, end);
}
template <typename CharT>
template <JSONStringType ST>
inline bool JSONFullParseHandler<CharT>::setStringValue(
CharPtr start, size_t length, mozilla::Span<const CharT>&& source) {
JSString* str;
if constexpr (ST == JSONStringType::PropertyName) {
str = AtomizeChars(cx, start.get(), length);
} else {
str = NewStringCopyN<CanGC>(cx, start.get(), length, gcHeap);
}
if (!str) {
return false;
}
v = JS::StringValue(str);
return true;
}
template <typename CharT>
template <JSONStringType ST>
inline bool JSONFullParseHandler<CharT>::setStringValue(
JSONStringBuilder& builder, mozilla::Span<const CharT>&& source) {
JSString* str;
if constexpr (ST == JSONStringType::PropertyName) {
str = builder.buffer.finishAtom();
} else {
str = builder.buffer.finishString(gcHeap);
}
if (!str) {
return false;
}
v = JS::StringValue(str);
return true;
}
template <typename CharT>
inline bool JSONFullParseHandler<CharT>::setNumberValue(
double d, mozilla::Span<const CharT>&& source) {
v = JS::NumberValue(d);
return true;
}
template <typename CharT>
inline bool JSONFullParseHandler<CharT>::setBooleanValue(
bool value, mozilla::Span<const CharT>&& source) {
return true;
}
template <typename CharT>
inline bool JSONFullParseHandler<CharT>::setNullValue(
mozilla::Span<const CharT>&& source) {
return true;
}
template <typename CharT>
void JSONFullParseHandler<CharT>::reportError(const char* msg, uint32_t line,
uint32_t column) {
const size_t MaxWidth = sizeof("4294967295");
char columnString[MaxWidth];
SprintfLiteral(columnString, "%" PRIu32, column);
char lineString[MaxWidth];
SprintfLiteral(lineString, "%" PRIu32, line);
if (reportLineNumbersFromParsedData) {
AutoReportFrontendContext fc(cx);
ErrorMetadata metadata;
metadata.isMuted = false;
metadata.filename = filename.valueOr(JS::ConstUTF8CharsZ(""));
metadata.lineNumber = line;
metadata.columnNumber = JS::ColumnNumberOneOrigin(column);
ReportJSONSyntaxError(&fc, std::move(metadata), JSMSG_JSON_BAD_PARSE, msg,
lineString, columnString);
} else {
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
JSMSG_JSON_BAD_PARSE, msg, lineString,
columnString);
}
}
template <typename CharT, typename HandlerT>
JSONPerHandlerParser<CharT, HandlerT>::~JSONPerHandlerParser() {
for (size_t i = 0; i < stack.length(); i++) {
handler.freeStackEntry(stack[i]);
}
}
template <typename CharT, typename HandlerT>
template <typename TempValueT, typename ResultSetter>
bool JSONPerHandlerParser<CharT, HandlerT>::parseImpl(TempValueT& value,
ResultSetter setResult) {
MOZ_ASSERT(stack.empty());
JSONToken token;
JSONParserState state = JSONParserState::JSONValue;
while (true) {
switch (state) {
case JSONParserState::FinishObjectMember: {
typename HandlerT::PropertyVector* properties;
if (!handler.finishObjectMember(stack, value, &properties)) {
return false;
}
token = tokenizer.advanceAfterProperty();
if (token == JSONToken::ObjectClose) {
if (!handler.finishObject(stack, &value, properties)) {
return false;
}
break;
}
if (token != JSONToken::Comma) {
if (token == JSONToken::OOM) {
return false;
}
if (token != JSONToken::Error) {
error(
"expected ',' or '}' after property-value pair in object "
"literal");
}
return handler.errorReturn();
}
token = tokenizer.advancePropertyName();
/* FALL THROUGH */
}
JSONMember:
if (token == JSONToken::String) {
bool isProtoInEval;
if (!handler.objectPropertyName(stack, &isProtoInEval)) {
return false;
}
if (isProtoInEval) {
// See JSONFullParseHandlerAnyChar::objectPropertyName.
return true;
}
token = tokenizer.advancePropertyColon();
if (token != JSONToken::Colon) {
MOZ_ASSERT(token == JSONToken::Error);
return handler.errorReturn();
}
goto JSONValue;
}
if (token == JSONToken::OOM) {
return false;
}
if (token != JSONToken::Error) {
error("property names must be double-quoted strings");
}
return handler.errorReturn();
case JSONParserState::FinishArrayElement: {
typename HandlerT::ElementVector* elements;
if (!handler.arrayElement(stack, value, &elements)) {
return false;
}
token = tokenizer.advanceAfterArrayElement();
if (token == JSONToken::Comma) {
goto JSONValue;
}
if (token == JSONToken::ArrayClose) {
if (!handler.finishArray(stack, &value, elements)) {
return false;
}
break;
}
MOZ_ASSERT(token == JSONToken::Error);
return handler.errorReturn();
}
JSONValue:
case JSONParserState::JSONValue:
token = tokenizer.advance();
JSONValueSwitch:
switch (token) {
case JSONToken::String:
value = handler.stringValue();
break;
case JSONToken::Number:
value = handler.numberValue();
break;
case JSONToken::True:
value = handler.booleanValue(true);
break;
case JSONToken::False:
value = handler.booleanValue(false);
break;
case JSONToken::Null:
value = handler.nullValue();
break;
case JSONToken::ArrayOpen: {
typename HandlerT::ElementVector* elements;
if (!handler.arrayOpen(stack, &elements)) {
return false;
}
token = tokenizer.advance();
if (token == JSONToken::ArrayClose) {
if (!handler.finishArray(stack, &value, elements)) {
return false;
}
break;
}
goto JSONValueSwitch;
}
case JSONToken::ObjectOpen: {
typename HandlerT::PropertyVector* properties;
if (!handler.objectOpen(stack, &properties)) {
return false;
}
token = tokenizer.advanceAfterObjectOpen();
if (token == JSONToken::ObjectClose) {
if (!handler.finishObject(stack, &value, properties)) {
return false;
}
break;
}
goto JSONMember;
}
case JSONToken::ArrayClose:
case JSONToken::ObjectClose:
case JSONToken::Colon:
case JSONToken::Comma:
// Move the current pointer backwards so that the position
// reported in the error message is correct.
tokenizer.unget();
error("unexpected character");
return handler.errorReturn();
case JSONToken::OOM:
return false;
case JSONToken::Error:
return handler.errorReturn();
}
break;
}
if (stack.empty()) {
break;
}
state = stack.back().state;
}
if (!tokenizer.consumeTrailingWhitespaces()) {
error("unexpected non-whitespace character after JSON data");
return handler.errorReturn();
}
MOZ_ASSERT(tokenizer.finished());
MOZ_ASSERT(stack.empty());
setResult(value);
return true;
}
template <typename CharT, typename HandlerT>
void JSONPerHandlerParser<CharT, HandlerT>::outOfMemory() {
ReportOutOfMemory(handler.context());
}
template <typename CharT, typename HandlerT>
void JSONPerHandlerParser<CharT, HandlerT>::error(const char* msg) {
if (handler.ignoreError()) {
return;
}
uint32_t column = 1, line = 1;
tokenizer.getTextPosition(&column, &line);
handler.reportError(msg, line, column);
}
template class js::JSONPerHandlerParser<Latin1Char,
js::JSONFullParseHandler<Latin1Char>>;
template class js::JSONPerHandlerParser<char16_t,
js::JSONFullParseHandler<char16_t>>;
template class js::JSONPerHandlerParser<Latin1Char,
js::JSONReviveHandler<Latin1Char>>;
template class js::JSONPerHandlerParser<char16_t,
js::JSONReviveHandler<char16_t>>;
template class js::JSONPerHandlerParser<Latin1Char,
js::JSONSyntaxParseHandler<Latin1Char>>;
template class js::JSONPerHandlerParser<char16_t,
js::JSONSyntaxParseHandler<char16_t>>;
template <typename CharT>
bool JSONParser<CharT>::parse(JS::MutableHandle<JS::Value> vp) {
JS::Rooted<JS::Value> tempValue(this->handler.cx);
vp.setUndefined();
return this->parseImpl(tempValue,
[&](JS::Handle<JS::Value> value) { vp.set(value); });
}
template <typename CharT>
void JSONParser<CharT>::trace(JSTracer* trc) {
this->handler.trace(trc);
for (auto& elem : this->stack) {
if (elem.state == JSONParserState::FinishArrayElement) {
elem.elements().trace(trc);
} else {
elem.properties().trace(trc);
}
}
}
template class js::JSONParser<Latin1Char>;
template class js::JSONParser<char16_t>;
template <typename CharT>
inline bool JSONReviveHandler<CharT>::objectOpen(Vector<StackEntry, 10>& stack,
PropertyVector** properties) {
ParseRecordEntry* newParseEntry = NewPlainObject(context());
if (!newParseEntry) {
return false;
}
if (!parseRecordStack.append(newParseEntry)) {
return false;
}
return Base::objectOpen(stack, properties);
}
template <typename CharT>
inline bool JSONReviveHandler<CharT>::finishObjectMember(
Vector<StackEntry, 10>& stack, JS::Handle<JS::Value> value,
PropertyVector** properties) {
if (!Base::finishObjectMember(stack, value, properties)) {
return false;
}
parseRecord->setValue(value);
Rooted<JS::PropertyKey> key(context(), (*properties)->back().id);
Rooted<ParseRecordEntry*> parseRecordBack(context(), parseRecordStack.back());
return finishMemberParseRecord(key, parseRecordBack);
}
template <typename CharT>
inline bool JSONReviveHandler<CharT>::finishObject(
Vector<StackEntry, 10>& stack, JS::MutableHandle<JS::Value> vp,
PropertyVector* properties) {
if (!Base::finishObject(stack, vp, properties)) {
return false;
}
Rooted<ParseRecordEntry*> parseRecordBack(context(), parseRecordStack.back());
if (!finishCompoundParseRecord(vp, parseRecordBack)) {
return false;
}
parseRecordStack.popBack();
return true;
}
template <typename CharT>
inline bool JSONReviveHandler<CharT>::arrayOpen(Vector<StackEntry, 10>& stack,
ElementVector** elements) {
ParseRecordEntry* newParseEntry = NewPlainObject(context());
if (!newParseEntry) {
return false;
}
if (!parseRecordStack.append(newParseEntry)) {
return false;
}
return Base::arrayOpen(stack, elements);
}
template <typename CharT>
inline bool JSONReviveHandler<CharT>::arrayElement(
Vector<StackEntry, 10>& stack, JS::Handle<JS::Value> value,
ElementVector** elements) {
if (!Base::arrayElement(stack, value, elements)) {
return false;
}
size_t index = (*elements)->length() - 1;
// The JSON string is limited to JS::MaxStringLength, so there should be no
// way to get more than IntMax elements
MOZ_ASSERT(index <= js::PropertyKey::IntMax);
Rooted<JS::PropertyKey> key(context(), js::PropertyKey::Int(int32_t(index)));
Rooted<ParseRecordEntry*> parseRecordBack(context(), parseRecordStack.back());
return finishMemberParseRecord(key, parseRecordBack);
}
template <typename CharT>
inline bool JSONReviveHandler<CharT>::finishArray(
Vector<StackEntry, 10>& stack, JS::MutableHandle<JS::Value> vp,
ElementVector* elements) {
if (!Base::finishArray(stack, vp, elements)) {
return false;
}
Rooted<ParseRecordEntry*> parseRecordBack(context(), parseRecordStack.back());
if (!finishCompoundParseRecord(vp, parseRecordBack)) {
return false;
}
parseRecordStack.popBack();
return true;
}
template <typename CharT>
inline bool JSONReviveHandler<CharT>::finishMemberParseRecord(
Handle<JS::PropertyKey> key, Handle<ParseRecordEntry*> parseEntry) {
parseRecord->setKey(context(), key.get());
Rooted<Value> pro(context(), ObjectValue(*parseRecord));
parseRecord = nullptr;
return JS_SetPropertyById(context(), parseEntry, key, pro);
}
template <typename CharT>
inline bool JSONReviveHandler<CharT>::finishCompoundParseRecord(
const Value& value, Handle<ParseRecordEntry*> parseEntry) {
parseRecord = ParseRecordObject::create(context(), value);
if (!parseRecord) {
return false;
}
return parseRecord->setEntries(context(), parseEntry);
}
template <typename CharT>
inline bool JSONReviveHandler<CharT>::finishPrimitiveParseRecord(
const Value& value, SourceT source) {
MOZ_ASSERT(!source.IsEmpty()); // Empty source is for objects and arrays
Rooted<JSONParseNode*> parseNode(
context(), NewStringCopy<CanGC, CharT>(context(), source));
if (!parseNode) {
return false;
}
parseRecord = ParseRecordObject::create(context(), parseNode, value);
return !!parseRecord;
}
template <typename CharT>
void JSONReviveHandler<CharT>::trace(JSTracer* trc) {
Base::trace(trc);
if (parseRecord) {
TraceRoot(trc, &parseRecord, "parse record");
}
this->parseRecordStack.trace(trc);
}
template <typename CharT>
bool JSONReviveParser<CharT>::parse(JS::MutableHandle<JS::Value> vp,
JS::MutableHandle<ParseRecordObject*> pro) {
JS::Rooted<JS::Value> tempValue(this->handler.cx);
vp.setUndefined();
if (!this->parseImpl(tempValue,
[&](JS::Handle<JS::Value> value) { vp.set(value); })) {
return false;
}
MOZ_ASSERT(this->handler.parseRecord);
pro.set(this->handler.parseRecord);
return true;
}
template <typename CharT>
void JSONReviveParser<CharT>::trace(JSTracer* trc) {
this->handler.trace(trc);
for (auto& elem : this->stack) {
if (elem.state == JSONParserState::FinishArrayElement) {
elem.elements().trace(trc);
} else {
elem.properties().trace(trc);
}
}
}
template class js::JSONReviveParser<Latin1Char>;
template class js::JSONReviveParser<char16_t>;
template <typename CharT>
inline bool JSONSyntaxParseHandler<CharT>::objectOpen(
Vector<StackEntry, 10>& stack, PropertyVector** properties) {
StackEntry entry{JSONParserState::FinishObjectMember};
if (!stack.append(entry)) {
return false;
}
return true;
}
template <typename CharT>
inline bool JSONSyntaxParseHandler<CharT>::finishObject(
Vector<StackEntry, 10>& stack, DummyValue* vp, PropertyVector* properties) {
stack.popBack();
return true;
}
template <typename CharT>
inline bool JSONSyntaxParseHandler<CharT>::arrayOpen(
Vector<StackEntry, 10>& stack, ElementVector** elements) {
StackEntry entry{JSONParserState::FinishArrayElement};
if (!stack.append(entry)) {
return false;
}
return true;
}
template <typename CharT>
inline bool JSONSyntaxParseHandler<CharT>::finishArray(
Vector<StackEntry, 10>& stack, DummyValue* vp, ElementVector* elements) {
stack.popBack();
return true;
}
template <typename CharT>
void JSONSyntaxParseHandler<CharT>::reportError(const char* msg, uint32_t line,
uint32_t column) {
const size_t MaxWidth = sizeof("4294967295");
char columnString[MaxWidth];
SprintfLiteral(columnString, "%" PRIu32, column);
char lineString[MaxWidth];
SprintfLiteral(lineString, "%" PRIu32, line);
ErrorMetadata metadata;
metadata.isMuted = false;
metadata.filename = JS::ConstUTF8CharsZ("");
metadata.lineNumber = 0;
metadata.columnNumber = JS::ColumnNumberOneOrigin();
ReportJSONSyntaxError(fc, std::move(metadata), JSMSG_JSON_BAD_PARSE, msg,
lineString, columnString);
}
template class js::JSONSyntaxParseHandler<Latin1Char>;
template class js::JSONSyntaxParseHandler<char16_t>;
template <typename CharT>
bool JSONSyntaxParser<CharT>::parse() {
typename HandlerT::DummyValue unused;
if (!this->parseImpl(unused,
[&](const typename HandlerT::DummyValue& unused) {})) {
return false;
}
return true;
}
template class js::JSONSyntaxParser<Latin1Char>;
template class js::JSONSyntaxParser<char16_t>;
template <typename CharT>
static bool IsValidJSONImpl(const CharT* chars, uint32_t len) {
FrontendContext fc;
// NOTE: We don't set stack quota here because JSON parser doesn't use it.
JSONSyntaxParser<CharT> parser(&fc, mozilla::Range(chars, len));
if (!parser.parse()) {
MOZ_ASSERT(fc.hadErrors());
return false;
}
MOZ_ASSERT(!fc.hadErrors());
return true;
}
JS_PUBLIC_API bool JS::IsValidJSON(const JS::Latin1Char* chars, uint32_t len) {
return IsValidJSONImpl(chars, len);
}
JS_PUBLIC_API bool JS::IsValidJSON(const char16_t* chars, uint32_t len) {
return IsValidJSONImpl(chars, len);
}
template <typename CharT>
class MOZ_STACK_CLASS DelegateHandler {
private:
using CharPtr = mozilla::RangedPtr<const CharT>;
public:
using ContextT = FrontendContext;
class DummyValue {};
struct ElementVector {};
struct PropertyVector {};
class JSONStringBuilder {
public:
StringBuilder buffer;
explicit JSONStringBuilder(FrontendContext* fc) : buffer(fc) {}
bool append(char16_t c) { return buffer.append(c); }
bool append(const CharT* begin, const CharT* end) {
return buffer.append(begin, end);
}
};
struct StackEntry {
JSONParserState state;
};
public:
FrontendContext* fc;
explicit DelegateHandler(FrontendContext* fc) : fc(fc) {}
DelegateHandler(DelegateHandler&& other) noexcept
: fc(other.fc), handler_(other.handler_) {}
DelegateHandler(const DelegateHandler& other) = delete;
void operator=(const DelegateHandler& other) = delete;
FrontendContext* context() { return fc; }
template <JSONStringType ST>
inline bool setStringValue(CharPtr start, size_t length,
mozilla::Span<const CharT>&& source) {
if (hadHandlerError_) {
return false;
}
if constexpr (ST == JSONStringType::PropertyName) {
return handler_->propertyName(start.get(), length);
}
return handler_->stringValue(start.get(), length);
}
template <JSONStringType ST>
inline bool setStringValue(JSONStringBuilder& builder,
mozilla::Span<const CharT>&& source) {
if (hadHandlerError_) {
return false;
}
if constexpr (ST == JSONStringType::PropertyName) {
if (builder.buffer.isUnderlyingBufferLatin1()) {
return handler_->propertyName(builder.buffer.rawLatin1Begin(),
builder.buffer.length());
}
return handler_->propertyName(builder.buffer.rawTwoByteBegin(),
builder.buffer.length());
}
if (builder.buffer.isUnderlyingBufferLatin1()) {
return handler_->stringValue(builder.buffer.rawLatin1Begin(),
builder.buffer.length());
}
return handler_->stringValue(builder.buffer.rawTwoByteBegin(),
builder.buffer.length());
}
inline bool setNumberValue(double d, mozilla::Span<const CharT>&& source) {
if (hadHandlerError_) {
return false;
}
if (!handler_->numberValue(d)) {
hadHandlerError_ = true;
}
return !hadHandlerError_;
}
inline bool setBooleanValue(bool value, mozilla::Span<const CharT>&& source) {
if (hadHandlerError_) {
return false;
}
if (!handler_->booleanValue(value)) {
hadHandlerError_ = true;
}
return !hadHandlerError_;
}
inline bool setNullValue(mozilla::Span<const CharT>&& source) {
if (hadHandlerError_) {
return false;
}
if (!handler_->nullValue()) {
hadHandlerError_ = true;
}
return !hadHandlerError_;
}
inline DummyValue numberValue() const { return DummyValue(); }
inline DummyValue stringValue() const { return DummyValue(); }
inline DummyValue booleanValue(bool value) { return DummyValue(); }
inline DummyValue nullValue() { return DummyValue(); }
inline bool objectOpen(Vector<StackEntry, 10>& stack,
PropertyVector** properties) {
if (hadHandlerError_) {
return false;
}
StackEntry entry{JSONParserState::FinishObjectMember};
if (!stack.append(entry)) {
return false;
}
return handler_->startObject();
}
inline bool objectPropertyName(Vector<StackEntry, 10>& stack,
bool* isProtoInEval) {
*isProtoInEval = false;
return true;
}
inline bool finishObjectMember(Vector<StackEntry, 10>& stack,
DummyValue& value,
PropertyVector** properties) {
return true;
}
inline bool finishObject(Vector<StackEntry, 10>& stack, DummyValue* vp,
PropertyVector* properties) {
if (hadHandlerError_) {
return false;
}
stack.popBack();
return handler_->endObject();
}
inline bool arrayOpen(Vector<StackEntry, 10>& stack,
ElementVector** elements) {
if (hadHandlerError_) {
return false;
}
StackEntry entry{JSONParserState::FinishArrayElement};
if (!stack.append(entry)) {
return false;
}
return handler_->startArray();
}
inline bool arrayElement(Vector<StackEntry, 10>& stack, DummyValue& value,
ElementVector** elements) {
return true;
}
inline bool finishArray(Vector<StackEntry, 10>& stack, DummyValue* vp,
ElementVector* elements) {
if (hadHandlerError_) {
return false;
}
stack.popBack();
return handler_->endArray();
}
inline bool errorReturn() const { return false; }
inline bool ignoreError() const { return false; }
inline void freeStackEntry(StackEntry& entry) {}
void reportError(const char* msg, uint32_t line, uint32_t column) {
handler_->error(msg, line, column);
}
void setDelegateHandler(JS::JSONParseHandler* handler) { handler_ = handler; }
private:
JS::JSONParseHandler* handler_ = nullptr;
bool hadHandlerError_ = false;
};
template class DelegateHandler<Latin1Char>;
template class DelegateHandler<char16_t>;
template <typename CharT>
class MOZ_STACK_CLASS DelegateParser
: JSONPerHandlerParser<CharT, DelegateHandler<CharT>> {
using HandlerT = DelegateHandler<CharT>;
using Base = JSONPerHandlerParser<CharT, HandlerT>;
public:
DelegateParser(FrontendContext* fc, mozilla::Range<const CharT> data,
JS::JSONParseHandler* handler)
: Base(fc, data) {
this->handler.setDelegateHandler(handler);
}
DelegateParser(DelegateParser<CharT>&& other) noexcept
: Base(std::move(other)) {}
DelegateParser(const DelegateParser& other) = delete;
void operator=(const DelegateParser& other) = delete;
bool parse() {
typename HandlerT::DummyValue unused;
if (!this->parseImpl(unused,
[&](const typename HandlerT::DummyValue& unused) {})) {
return false;
}
return true;
}
};
template class DelegateParser<Latin1Char>;
template class DelegateParser<char16_t>;
template <typename CharT>
static bool ParseJSONWithHandlerImpl(const CharT* chars, uint32_t len,
JS::JSONParseHandler* handler) {
FrontendContext fc;
// NOTE: We don't set stack quota here because JSON parser doesn't use it.
DelegateParser<CharT> parser(&fc, mozilla::Range(chars, len), handler);
if (!parser.parse()) {
return false;
}
MOZ_ASSERT(!fc.hadErrors());
return true;
}
JS_PUBLIC_API bool JS::ParseJSONWithHandler(const JS::Latin1Char* chars,
uint32_t len,
JS::JSONParseHandler* handler) {
return ParseJSONWithHandlerImpl(chars, len, handler);
}
JS_PUBLIC_API bool JS::ParseJSONWithHandler(const char16_t* chars, uint32_t len,
JS::JSONParseHandler* handler) {
return ParseJSONWithHandlerImpl(chars, len, handler);
}