JS_GetScriptSourceMap(JSContext *cx, JSScript *script)
{
ScriptSource *source = script->scriptSource();
JS_ASSERT(source);
return source->hasSourceMapURL() ? source->sourceMapURL() : nullptr;
}
JSScript*
frontend::CompileScript(ExclusiveContext* cx, LifoAlloc* alloc, HandleObject scopeChain,
HandleScript evalCaller,
Handle<StaticEvalObject*> evalStaticScope,
const ReadOnlyCompileOptions& options,
SourceBufferHolder& srcBuf,
JSString* source_ /* = nullptr */,
unsigned staticLevel /* = 0 */,
SourceCompressionTask* extraSct /* = nullptr */)
{
MOZ_ASSERT(srcBuf.get());
RootedString source(cx, source_);
js::TraceLoggerThread* logger = nullptr;
if (cx->isJSContext())
logger = TraceLoggerForMainThread(cx->asJSContext()->runtime());
else
logger = TraceLoggerForCurrentThread();
js::TraceLoggerEvent event(logger, TraceLogger_AnnotateScripts, options);
js::AutoTraceLog scriptLogger(logger, event);
js::AutoTraceLog typeLogger(logger, TraceLogger_ParserCompileScript);
/*
* The scripted callerFrame can only be given for compile-and-go scripts
* and non-zero static level requires callerFrame.
*/
MOZ_ASSERT_IF(evalCaller, options.compileAndGo);
MOZ_ASSERT_IF(evalCaller, options.forEval);
MOZ_ASSERT_IF(evalCaller && evalCaller->strict(), options.strictOption);
MOZ_ASSERT_IF(staticLevel != 0, evalCaller);
if (!CheckLength(cx, srcBuf))
return nullptr;
MOZ_ASSERT_IF(staticLevel != 0, !options.sourceIsLazy);
RootedScriptSource sourceObject(cx, CreateScriptSourceObject(cx, options));
if (!sourceObject)
return nullptr;
ScriptSource* ss = sourceObject->source();
SourceCompressionTask mysct(cx);
SourceCompressionTask* sct = extraSct ? extraSct : &mysct;
if (!cx->compartment()->options().discardSource()) {
if (options.sourceIsLazy)
ss->setSourceRetrievable();
else if (!ss->setSourceCopy(cx, srcBuf, false, sct))
return nullptr;
}
bool canLazilyParse = CanLazilyParse(cx, options);
Maybe<Parser<SyntaxParseHandler> > syntaxParser;
if (canLazilyParse) {
syntaxParser.emplace(cx, alloc, options, srcBuf.get(), srcBuf.length(),
/* foldConstants = */ false,
(Parser<SyntaxParseHandler>*) nullptr,
(LazyScript*) nullptr);
if (!syntaxParser->checkOptions())
return nullptr;
}
Parser<FullParseHandler> parser(cx, alloc, options, srcBuf.get(), srcBuf.length(),
/* foldConstants = */ true,
canLazilyParse ? syntaxParser.ptr() : nullptr, nullptr);
parser.sct = sct;
parser.ss = ss;
if (!parser.checkOptions())
return nullptr;
Directives directives(options.strictOption);
GlobalSharedContext globalsc(cx, scopeChain, directives, options.extraWarningsOption);
bool savedCallerFun = evalCaller && evalCaller->functionOrCallerFunction();
Rooted<JSScript*> script(cx, JSScript::Create(cx, evalStaticScope, savedCallerFun,
options, staticLevel, sourceObject, 0,
srcBuf.length()));
if (!script)
return nullptr;
// We can specialize a bit for the given scope chain if that scope chain is the global object.
JSObject* globalScope =
scopeChain && scopeChain == &scopeChain->global() ? (JSObject*) scopeChain : nullptr;
MOZ_ASSERT_IF(globalScope, globalScope->isNative());
MOZ_ASSERT_IF(globalScope, JSCLASS_HAS_GLOBAL_FLAG_AND_SLOTS(globalScope->getClass()));
BytecodeEmitter::EmitterMode emitterMode =
options.selfHostingMode ? BytecodeEmitter::SelfHosting : BytecodeEmitter::Normal;
BytecodeEmitter bce(/* parent = */ nullptr, &parser, &globalsc, script,
/* lazyScript = */ js::NullPtr(), options.forEval,
evalCaller, evalStaticScope, !!globalScope, options.lineno, emitterMode);
if (!bce.init())
return nullptr;
// Syntax parsing may cause us to restart processing of top level
// statements in the script. Use Maybe<> so that the parse context can be
// reset when this occurs.
Maybe<ParseContext<FullParseHandler> > pc;
pc.emplace(&parser, (GenericParseContext*) nullptr, (ParseNode*) nullptr, &globalsc,
(Directives*) nullptr, staticLevel, /* bodyid = */ 0,
/* blockScopeDepth = */ 0);
if (!pc->init(parser.tokenStream))
return nullptr;
if (savedCallerFun) {
/*
* An eval script in a caller frame needs to have its enclosing
* function captured in case it refers to an upvar, and someone
* wishes to decompile it while it's running.
*/
JSFunction* fun = evalCaller->functionOrCallerFunction();
MOZ_ASSERT_IF(fun->strict(), options.strictOption);
Directives directives(/* strict = */ options.strictOption);
ObjectBox* funbox = parser.newFunctionBox(/* fn = */ nullptr, fun, pc.ptr(),
directives, fun->generatorKind());
if (!funbox)
return nullptr;
bce.objectList.add(funbox);
}
bool canHaveDirectives = true;
for (;;) {
TokenKind tt;
if (!parser.tokenStream.peekToken(&tt, TokenStream::Operand))
return nullptr;
if (tt == TOK_EOF)
break;
TokenStream::Position pos(parser.keepAtoms);
parser.tokenStream.tell(&pos);
ParseNode* pn = parser.statement(canHaveDirectives);
if (!pn) {
if (parser.hadAbortedSyntaxParse()) {
// Parsing inner functions lazily may lead the parser into an
// unrecoverable state and may require starting over on the top
// level statement. Restart the parse; syntax parsing has
// already been disabled for the parser and the result will not
// be ambiguous.
parser.clearAbortedSyntaxParse();
parser.tokenStream.seek(pos);
// Destroying the parse context will destroy its free
// variables, so check if any deoptimization is needed.
if (!MaybeCheckEvalFreeVariables(cx, evalCaller, scopeChain, parser, *pc))
return nullptr;
pc.reset();
pc.emplace(&parser, (GenericParseContext*) nullptr, (ParseNode*) nullptr,
&globalsc, (Directives*) nullptr, staticLevel, /* bodyid = */ 0,
script->bindings.numBlockScoped());
if (!pc->init(parser.tokenStream))
return nullptr;
MOZ_ASSERT(parser.pc == pc.ptr());
pn = parser.statement();
}
if (!pn) {
MOZ_ASSERT(!parser.hadAbortedSyntaxParse());
return nullptr;
}
}
// Accumulate the maximum block scope depth, so that EmitTree can assert
// when emitting JSOP_GETLOCAL that the local is indeed within the fixed
// part of the stack frame.
script->bindings.updateNumBlockScoped(pc->blockScopeDepth);
if (canHaveDirectives) {
if (!parser.maybeParseDirective(/* stmtList = */ nullptr, pn, &canHaveDirectives))
return nullptr;
}
if (!FoldConstants(cx, &pn, &parser))
return nullptr;
if (!NameFunctions(cx, pn))
return nullptr;
if (!bce.updateLocalsToFrameSlots())
return nullptr;
if (!EmitTree(cx, &bce, pn))
return nullptr;
parser.handler.freeTree(pn);
}
if (!MaybeCheckEvalFreeVariables(cx, evalCaller, scopeChain, parser, *pc))
return nullptr;
if (!SetDisplayURL(cx, parser.tokenStream, ss))
return nullptr;
if (!SetSourceMap(cx, parser.tokenStream, ss))
return nullptr;
/*
* Source map URLs passed as a compile option (usually via a HTTP source map
* header) override any source map urls passed as comment pragmas.
*/
if (options.sourceMapURL()) {
// Warn about the replacement, but use the new one.
if (ss->hasSourceMapURL()) {
if(!parser.report(ParseWarning, false, nullptr, JSMSG_ALREADY_HAS_PRAGMA,
ss->filename(), "//# sourceMappingURL"))
return nullptr;
}
if (!ss->setSourceMapURL(cx, options.sourceMapURL()))
return nullptr;
}
/*
* Nowadays the threaded interpreter needs a last return instruction, so we
* do have to emit that here.
*/
if (Emit1(cx, &bce, JSOP_RETRVAL) < 0)
return nullptr;
// Global/eval script bindings are always empty (all names are added to the
// scope dynamically via JSOP_DEFFUN/VAR). They may have block-scoped
// locals, however, which are allocated to the fixed part of the stack
// frame.
InternalHandle<Bindings*> bindings(script, &script->bindings);
if (!Bindings::initWithTemporaryStorage(cx, bindings, 0, 0, 0,
pc->blockScopeDepth, 0, 0, nullptr))
{
return nullptr;
}
if (!JSScript::fullyInitFromEmitter(cx, script, &bce))
return nullptr;
// Note that this marking must happen before we tell Debugger
// about the new script, in case Debugger delazifies the script's
// inner functions.
if (options.forEval)
MarkFunctionsWithinEvalScript(script);
bce.tellDebuggerAboutCompiledScript(cx);
if (sct && !extraSct && !sct->complete())
return nullptr;
MOZ_ASSERT_IF(cx->isJSContext(), !cx->asJSContext()->isExceptionPending());
return script;
}