michael@0: /* vim: set ts=8 sts=4 et sw=4 tw=80:
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include <stdlib.h>
michael@0: #include <errno.h>
michael@0: #ifdef HAVE_IO_H
michael@0: #include <io.h>     /* for isatty() */
michael@0: #endif
michael@0: #ifdef HAVE_UNISTD_H
michael@0: #include <unistd.h>     /* for isatty() */
michael@0: #endif
michael@0: 
michael@0: #include "base/basictypes.h"
michael@0: 
michael@0: #include "jsapi.h"
michael@0: #include "js/OldDebugAPI.h"
michael@0: 
michael@0: #include "xpcpublic.h"
michael@0: 
michael@0: #include "XPCShellEnvironment.h"
michael@0: 
michael@0: #include "mozilla/XPCOM.h"
michael@0: 
michael@0: #include "nsIChannel.h"
michael@0: #include "nsIClassInfo.h"
michael@0: #include "nsIDirectoryService.h"
michael@0: #include "nsIJSRuntimeService.h"
michael@0: #include "nsIPrincipal.h"
michael@0: #include "nsIScriptSecurityManager.h"
michael@0: #include "nsIURI.h"
michael@0: #include "nsIXPConnect.h"
michael@0: #include "nsIXPCScriptable.h"
michael@0: 
michael@0: #include "nsCxPusher.h"
michael@0: #include "nsJSUtils.h"
michael@0: #include "nsJSPrincipals.h"
michael@0: #include "nsThreadUtils.h"
michael@0: #include "nsXULAppAPI.h"
michael@0: 
michael@0: #include "BackstagePass.h"
michael@0: 
michael@0: #include "TestShellChild.h"
michael@0: #include "TestShellParent.h"
michael@0: 
michael@0: using mozilla::ipc::XPCShellEnvironment;
michael@0: using mozilla::ipc::TestShellChild;
michael@0: using mozilla::ipc::TestShellParent;
michael@0: using mozilla::AutoSafeJSContext;
michael@0: using namespace JS;
michael@0: 
michael@0: namespace {
michael@0: 
michael@0: static const char kDefaultRuntimeScriptFilename[] = "xpcshell.js";
michael@0: 
michael@0: class XPCShellDirProvider : public nsIDirectoryServiceProvider
michael@0: {
michael@0: public:
michael@0:     NS_DECL_ISUPPORTS
michael@0:     NS_DECL_NSIDIRECTORYSERVICEPROVIDER
michael@0: 
michael@0:     XPCShellDirProvider() { }
michael@0:     ~XPCShellDirProvider() { }
michael@0: 
michael@0:     bool SetGREDir(const char *dir);
michael@0:     void ClearGREDir() { mGREDir = nullptr; }
michael@0: 
michael@0: private:
michael@0:     nsCOMPtr<nsIFile> mGREDir;
michael@0: };
michael@0: 
michael@0: inline XPCShellEnvironment*
michael@0: Environment(Handle<JSObject*> global)
michael@0: {
michael@0:     AutoSafeJSContext cx;
michael@0:     JSAutoCompartment ac(cx, global);
michael@0:     Rooted<Value> v(cx);
michael@0:     if (!JS_GetProperty(cx, global, "__XPCShellEnvironment", &v) ||
michael@0:         !v.get().isDouble())
michael@0:     {
michael@0:         return nullptr;
michael@0:     }
michael@0:     return static_cast<XPCShellEnvironment*>(v.get().toPrivate());
michael@0: }
michael@0: 
michael@0: static bool
michael@0: Print(JSContext *cx, unsigned argc, JS::Value *vp)
michael@0: {
michael@0:     JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
michael@0: 
michael@0:     for (unsigned i = 0; i < args.length(); i++) {
michael@0:         JSString *str = JS::ToString(cx, args[i]);
michael@0:         if (!str)
michael@0:             return false;
michael@0:         JSAutoByteString bytes(cx, str);
michael@0:         if (!bytes)
michael@0:             return false;
michael@0:         fprintf(stdout, "%s%s", i ? " " : "", bytes.ptr());
michael@0:         fflush(stdout);
michael@0:     }
michael@0:     fputc('\n', stdout);
michael@0:     args.rval().setUndefined();
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: static bool
michael@0: GetLine(char *bufp,
michael@0:         FILE *file,
michael@0:         const char *prompt)
michael@0: {
michael@0:     char line[256];
michael@0:     fputs(prompt, stdout);
michael@0:     fflush(stdout);
michael@0:     if (!fgets(line, sizeof line, file))
michael@0:         return false;
michael@0:     strcpy(bufp, line);
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: static bool
michael@0: Dump(JSContext *cx, unsigned argc, JS::Value *vp)
michael@0: {
michael@0:     JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
michael@0: 
michael@0:     if (!args.length())
michael@0:         return true;
michael@0: 
michael@0:     JSString *str = JS::ToString(cx, args[0]);
michael@0:     if (!str)
michael@0:         return false;
michael@0:     JSAutoByteString bytes(cx, str);
michael@0:     if (!bytes)
michael@0:       return false;
michael@0: 
michael@0:     fputs(bytes.ptr(), stdout);
michael@0:     fflush(stdout);
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: static bool
michael@0: Load(JSContext *cx,
michael@0:      unsigned argc,
michael@0:      JS::Value *vp)
michael@0: {
michael@0:     JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
michael@0: 
michael@0:     JS::Rooted<JSObject*> obj(cx, JS_THIS_OBJECT(cx, vp));
michael@0:     if (!obj)
michael@0:         return false;
michael@0: 
michael@0:     for (unsigned i = 0; i < args.length(); i++) {
michael@0:         JS::Rooted<JSString*> str(cx, JS::ToString(cx, args[i]));
michael@0:         if (!str)
michael@0:             return false;
michael@0:         JSAutoByteString filename(cx, str);
michael@0:         if (!filename)
michael@0:             return false;
michael@0:         FILE *file = fopen(filename.ptr(), "r");
michael@0:         if (!file) {
michael@0:             JS_ReportError(cx, "cannot open file '%s' for reading", filename.ptr());
michael@0:             return false;
michael@0:         }
michael@0:         Rooted<JSObject*> global(cx, JS::CurrentGlobalOrNull(cx));
michael@0:         JS::CompileOptions options(cx);
michael@0:         options.setUTF8(true)
michael@0:                .setFileAndLine(filename.ptr(), 1);
michael@0:         JS::Rooted<JSScript*> script(cx, JS::Compile(cx, obj, options, file));
michael@0:         fclose(file);
michael@0:         if (!script)
michael@0:             return false;
michael@0: 
michael@0:         if (!JS_ExecuteScript(cx, obj, script)) {
michael@0:             return false;
michael@0:         }
michael@0:     }
michael@0:     args.rval().setUndefined();
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: static bool
michael@0: Version(JSContext *cx,
michael@0:         unsigned argc,
michael@0:         JS::Value *vp)
michael@0: {
michael@0:     JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
michael@0:     args.rval().setInt32(JS_GetVersion(cx));
michael@0:     if (args.get(0).isInt32())
michael@0:         JS_SetVersionForCompartment(js::GetContextCompartment(cx),
michael@0:                                     JSVersion(args[0].toInt32()));
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: static bool
michael@0: BuildDate(JSContext *cx, unsigned argc, JS::Value *vp)
michael@0: {
michael@0:     JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
michael@0:     fprintf(stdout, "built on %s at %s\n", __DATE__, __TIME__);
michael@0:     args.rval().setUndefined();
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: static bool
michael@0: Quit(JSContext *cx,
michael@0:      unsigned argc,
michael@0:      JS::Value *vp)
michael@0: {
michael@0:     Rooted<JSObject*> global(cx, JS::CurrentGlobalOrNull(cx));
michael@0:     XPCShellEnvironment* env = Environment(global);
michael@0:     env->SetIsQuitting();
michael@0: 
michael@0:     return false;
michael@0: }
michael@0: 
michael@0: static bool
michael@0: DumpXPC(JSContext *cx,
michael@0:         unsigned argc,
michael@0:         JS::Value *vp)
michael@0: {
michael@0:     JS::CallArgs args = CallArgsFromVp(argc, vp);
michael@0: 
michael@0:     uint16_t depth = 2;
michael@0:     if (args.length() > 0) {
michael@0:         if (!JS::ToUint16(cx, args[0], &depth))
michael@0:             return false;
michael@0:     }
michael@0: 
michael@0:     nsCOMPtr<nsIXPConnect> xpc = do_GetService(nsIXPConnect::GetCID());
michael@0:     if (xpc)
michael@0:         xpc->DebugDump(int16_t(depth));
michael@0:     args.rval().setUndefined();
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: static bool
michael@0: GC(JSContext *cx,
michael@0:    unsigned argc,
michael@0:    JS::Value *vp)
michael@0: {
michael@0:     JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
michael@0: 
michael@0:     JSRuntime *rt = JS_GetRuntime(cx);
michael@0:     JS_GC(rt);
michael@0: #ifdef JS_GCMETER
michael@0:     js_DumpGCStats(rt, stdout);
michael@0: #endif
michael@0:     args.rval().setUndefined();
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: #ifdef JS_GC_ZEAL
michael@0: static bool
michael@0: GCZeal(JSContext *cx, unsigned argc, JS::Value *vp)
michael@0: {
michael@0:   CallArgs args = CallArgsFromVp(argc, vp);
michael@0: 
michael@0:   uint32_t zeal;
michael@0:   if (!ToUint32(cx, args.get(0), &zeal))
michael@0:     return false;
michael@0: 
michael@0:   JS_SetGCZeal(cx, uint8_t(zeal), JS_DEFAULT_ZEAL_FREQ);
michael@0:   return true;
michael@0: }
michael@0: #endif
michael@0: 
michael@0: const JSFunctionSpec gGlobalFunctions[] =
michael@0: {
michael@0:     JS_FS("print",           Print,          0,0),
michael@0:     JS_FS("load",            Load,           1,0),
michael@0:     JS_FS("quit",            Quit,           0,0),
michael@0:     JS_FS("version",         Version,        1,0),
michael@0:     JS_FS("build",           BuildDate,      0,0),
michael@0:     JS_FS("dumpXPC",         DumpXPC,        1,0),
michael@0:     JS_FS("dump",            Dump,           1,0),
michael@0:     JS_FS("gc",              GC,             0,0),
michael@0:  #ifdef JS_GC_ZEAL
michael@0:     JS_FS("gczeal",          GCZeal,         1,0),
michael@0:  #endif
michael@0:     JS_FS_END
michael@0: };
michael@0: 
michael@0: typedef enum JSShellErrNum
michael@0: {
michael@0: #define MSG_DEF(name, number, count, exception, format) \
michael@0:     name = number,
michael@0: #include "jsshell.msg"
michael@0: #undef MSG_DEF
michael@0:     JSShellErr_Limit
michael@0: #undef MSGDEF
michael@0: } JSShellErrNum;
michael@0: 
michael@0: } /* anonymous namespace */
michael@0: 
michael@0: void
michael@0: XPCShellEnvironment::ProcessFile(JSContext *cx,
michael@0:                                  JS::Handle<JSObject*> obj,
michael@0:                                  const char *filename,
michael@0:                                  FILE *file,
michael@0:                                  bool forceTTY)
michael@0: {
michael@0:     XPCShellEnvironment* env = this;
michael@0: 
michael@0:     JS::Rooted<JS::Value> result(cx);
michael@0:     int lineno, startline;
michael@0:     bool ok, hitEOF;
michael@0:     char *bufp, buffer[4096];
michael@0:     JSString *str;
michael@0: 
michael@0:     if (forceTTY) {
michael@0:         file = stdin;
michael@0:     }
michael@0:     else if (!isatty(fileno(file)))
michael@0:     {
michael@0:         /*
michael@0:          * It's not interactive - just execute it.
michael@0:          *
michael@0:          * Support the UNIX #! shell hack; gobble the first line if it starts
michael@0:          * with '#'.  TODO - this isn't quite compatible with sharp variables,
michael@0:          * as a legal js program (using sharp variables) might start with '#'.
michael@0:          * But that would require multi-character lookahead.
michael@0:          */
michael@0:         int ch = fgetc(file);
michael@0:         if (ch == '#') {
michael@0:             while((ch = fgetc(file)) != EOF) {
michael@0:                 if(ch == '\n' || ch == '\r')
michael@0:                     break;
michael@0:             }
michael@0:         }
michael@0:         ungetc(ch, file);
michael@0: 
michael@0:         JSAutoRequest ar(cx);
michael@0:         JSAutoCompartment ac(cx, obj);
michael@0: 
michael@0:         JS::CompileOptions options(cx);
michael@0:         options.setUTF8(true)
michael@0:                .setFileAndLine(filename, 1);
michael@0:         JS::Rooted<JSScript*> script(cx, JS::Compile(cx, obj, options, file));
michael@0:         if (script)
michael@0:             (void)JS_ExecuteScript(cx, obj, script, &result);
michael@0: 
michael@0:         return;
michael@0:     }
michael@0: 
michael@0:     /* It's an interactive filehandle; drop into read-eval-print loop. */
michael@0:     lineno = 1;
michael@0:     hitEOF = false;
michael@0:     do {
michael@0:         bufp = buffer;
michael@0:         *bufp = '\0';
michael@0: 
michael@0:         JSAutoRequest ar(cx);
michael@0:         JSAutoCompartment ac(cx, obj);
michael@0: 
michael@0:         /*
michael@0:          * Accumulate lines until we get a 'compilable unit' - one that either
michael@0:          * generates an error (before running out of source) or that compiles
michael@0:          * cleanly.  This should be whenever we get a complete statement that
michael@0:          * coincides with the end of a line.
michael@0:          */
michael@0:         startline = lineno;
michael@0:         do {
michael@0:             if (!GetLine(bufp, file, startline == lineno ? "js> " : "")) {
michael@0:                 hitEOF = true;
michael@0:                 break;
michael@0:             }
michael@0:             bufp += strlen(bufp);
michael@0:             lineno++;
michael@0:         } while (!JS_BufferIsCompilableUnit(cx, obj, buffer, strlen(buffer)));
michael@0: 
michael@0:         /* Clear any pending exception from previous failed compiles.  */
michael@0:         JS_ClearPendingException(cx);
michael@0:         JS::CompileOptions options(cx);
michael@0:         options.setFileAndLine("typein", startline);
michael@0:         JS::Rooted<JSScript*> script(cx,
michael@0:                                      JS_CompileScript(cx, obj, buffer, strlen(buffer), options));
michael@0:         if (script) {
michael@0:             JSErrorReporter older;
michael@0: 
michael@0:             ok = JS_ExecuteScript(cx, obj, script, &result);
michael@0:             if (ok && result != JSVAL_VOID) {
michael@0:                 /* Suppress error reports from JS::ToString(). */
michael@0:                 older = JS_SetErrorReporter(cx, nullptr);
michael@0:                 str = JS::ToString(cx, result);
michael@0:                 JSAutoByteString bytes;
michael@0:                 if (str)
michael@0:                     bytes.encodeLatin1(cx, str);
michael@0:                 JS_SetErrorReporter(cx, older);
michael@0: 
michael@0:                 if (!!bytes)
michael@0:                     fprintf(stdout, "%s\n", bytes.ptr());
michael@0:                 else
michael@0:                     ok = false;
michael@0:             }
michael@0:         }
michael@0:     } while (!hitEOF && !env->IsQuitting());
michael@0: 
michael@0:     fprintf(stdout, "\n");
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP_(MozExternalRefCountType)
michael@0: XPCShellDirProvider::AddRef()
michael@0: {
michael@0:     return 2;
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP_(MozExternalRefCountType)
michael@0: XPCShellDirProvider::Release()
michael@0: {
michael@0:     return 1;
michael@0: }
michael@0: 
michael@0: NS_IMPL_QUERY_INTERFACE(XPCShellDirProvider, nsIDirectoryServiceProvider)
michael@0: 
michael@0: bool
michael@0: XPCShellDirProvider::SetGREDir(const char *dir)
michael@0: {
michael@0:     nsresult rv = XRE_GetFileFromPath(dir, getter_AddRefs(mGREDir));
michael@0:     return NS_SUCCEEDED(rv);
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: XPCShellDirProvider::GetFile(const char *prop,
michael@0:                              bool *persistent,
michael@0:                              nsIFile* *result)
michael@0: {
michael@0:     if (mGREDir && !strcmp(prop, NS_GRE_DIR)) {
michael@0:         *persistent = true;
michael@0:         NS_ADDREF(*result = mGREDir);
michael@0:         return NS_OK;
michael@0:     }
michael@0: 
michael@0:     return NS_ERROR_FAILURE;
michael@0: }
michael@0: 
michael@0: // static
michael@0: XPCShellEnvironment*
michael@0: XPCShellEnvironment::CreateEnvironment()
michael@0: {
michael@0:     XPCShellEnvironment* env = new XPCShellEnvironment();
michael@0:     if (env && !env->Init()) {
michael@0:         delete env;
michael@0:         env = nullptr;
michael@0:     }
michael@0:     return env;
michael@0: }
michael@0: 
michael@0: XPCShellEnvironment::XPCShellEnvironment()
michael@0: :   mQuitting(false)
michael@0: {
michael@0: }
michael@0: 
michael@0: XPCShellEnvironment::~XPCShellEnvironment()
michael@0: {
michael@0: 
michael@0:     AutoSafeJSContext cx;
michael@0:     Rooted<JSObject*> global(cx, GetGlobalObject());
michael@0:     if (global) {
michael@0:         {
michael@0:             JSAutoCompartment ac(cx, global);
michael@0:             JS_SetAllNonReservedSlotsToUndefined(cx, global);
michael@0:         }
michael@0:         mGlobalHolder.Release();
michael@0: 
michael@0:         JSRuntime *rt = JS_GetRuntime(cx);
michael@0:         JS_GC(rt);
michael@0:     }
michael@0: }
michael@0: 
michael@0: bool
michael@0: XPCShellEnvironment::Init()
michael@0: {
michael@0:     nsresult rv;
michael@0: 
michael@0:     // unbuffer stdout so that output is in the correct order; note that stderr
michael@0:     // is unbuffered by default
michael@0:     setbuf(stdout, 0);
michael@0: 
michael@0:     nsCOMPtr<nsIJSRuntimeService> rtsvc =
michael@0:         do_GetService("@mozilla.org/js/xpc/RuntimeService;1");
michael@0:     if (!rtsvc) {
michael@0:         NS_ERROR("failed to get nsJSRuntimeService!");
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     JSRuntime *rt;
michael@0:     if (NS_FAILED(rtsvc->GetRuntime(&rt)) || !rt) {
michael@0:         NS_ERROR("failed to get JSRuntime from nsJSRuntimeService!");
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     if (!mGlobalHolder.Hold(rt)) {
michael@0:         NS_ERROR("Can't protect global object!");
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     AutoSafeJSContext cx;
michael@0: 
michael@0:     JS_SetContextPrivate(cx, this);
michael@0: 
michael@0:     nsCOMPtr<nsIXPConnect> xpc =
michael@0:       do_GetService(nsIXPConnect::GetCID());
michael@0:     if (!xpc) {
michael@0:         NS_ERROR("failed to get nsXPConnect service!");
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     nsCOMPtr<nsIPrincipal> principal;
michael@0:     nsCOMPtr<nsIScriptSecurityManager> securityManager =
michael@0:         do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID, &rv);
michael@0:     if (NS_SUCCEEDED(rv) && securityManager) {
michael@0:         rv = securityManager->GetSystemPrincipal(getter_AddRefs(principal));
michael@0:         if (NS_FAILED(rv)) {
michael@0:             fprintf(stderr, "+++ Failed to obtain SystemPrincipal from ScriptSecurityManager service.\n");
michael@0:         }
michael@0:     } else {
michael@0:         fprintf(stderr, "+++ Failed to get ScriptSecurityManager service, running without principals");
michael@0:     }
michael@0: 
michael@0:     nsRefPtr<BackstagePass> backstagePass;
michael@0:     rv = NS_NewBackstagePass(getter_AddRefs(backstagePass));
michael@0:     if (NS_FAILED(rv)) {
michael@0:         NS_ERROR("Failed to create backstage pass!");
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     JS::CompartmentOptions options;
michael@0:     options.setZone(JS::SystemZone)
michael@0:            .setVersion(JSVERSION_LATEST);
michael@0:     nsCOMPtr<nsIXPConnectJSObjectHolder> holder;
michael@0:     rv = xpc->InitClassesWithNewWrappedGlobal(cx,
michael@0:                                               static_cast<nsIGlobalObject *>(backstagePass),
michael@0:                                               principal, 0,
michael@0:                                               options,
michael@0:                                               getter_AddRefs(holder));
michael@0:     if (NS_FAILED(rv)) {
michael@0:         NS_ERROR("InitClassesWithNewWrappedGlobal failed!");
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     JS::Rooted<JSObject*> globalObj(cx, holder->GetJSObject());
michael@0:     if (!globalObj) {
michael@0:         NS_ERROR("Failed to get global JSObject!");
michael@0:         return false;
michael@0:     }
michael@0:     JSAutoCompartment ac(cx, globalObj);
michael@0: 
michael@0:     backstagePass->SetGlobalObject(globalObj);
michael@0: 
michael@0:     JS::Rooted<Value> privateVal(cx, PrivateValue(this));
michael@0:     if (!JS_DefineProperty(cx, globalObj, "__XPCShellEnvironment",
michael@0:                            privateVal, JSPROP_READONLY | JSPROP_PERMANENT,
michael@0:                            JS_PropertyStub, JS_StrictPropertyStub) ||
michael@0:         !JS_DefineFunctions(cx, globalObj, gGlobalFunctions) ||
michael@0:         !JS_DefineProfilingFunctions(cx, globalObj))
michael@0:     {
michael@0:         NS_ERROR("JS_DefineFunctions failed!");
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     mGlobalHolder = globalObj;
michael@0: 
michael@0:     FILE* runtimeScriptFile = fopen(kDefaultRuntimeScriptFilename, "r");
michael@0:     if (runtimeScriptFile) {
michael@0:         fprintf(stdout, "[loading '%s'...]\n", kDefaultRuntimeScriptFilename);
michael@0:         ProcessFile(cx, globalObj, kDefaultRuntimeScriptFilename,
michael@0:                     runtimeScriptFile, false);
michael@0:         fclose(runtimeScriptFile);
michael@0:     }
michael@0: 
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: bool
michael@0: XPCShellEnvironment::EvaluateString(const nsString& aString,
michael@0:                                     nsString* aResult)
michael@0: {
michael@0:   AutoSafeJSContext cx;
michael@0:   JS::Rooted<JSObject*> global(cx, GetGlobalObject());
michael@0:   JSAutoCompartment ac(cx, global);
michael@0: 
michael@0:   JS::CompileOptions options(cx);
michael@0:   options.setFileAndLine("typein", 0);
michael@0:   JS::Rooted<JSScript*> script(cx, JS_CompileUCScript(cx, global, aString.get(),
michael@0:                                                       aString.Length(), options));
michael@0:   if (!script) {
michael@0:      return false;
michael@0:   }
michael@0: 
michael@0:   if (aResult) {
michael@0:       aResult->Truncate();
michael@0:   }
michael@0: 
michael@0:   JS::Rooted<JS::Value> result(cx);
michael@0:   bool ok = JS_ExecuteScript(cx, global, script, &result);
michael@0:   if (ok && result != JSVAL_VOID) {
michael@0:       JSErrorReporter old = JS_SetErrorReporter(cx, nullptr);
michael@0:       JSString* str = JS::ToString(cx, result);
michael@0:       nsDependentJSString depStr;
michael@0:       if (str)
michael@0:           depStr.init(cx, str);
michael@0:       JS_SetErrorReporter(cx, old);
michael@0: 
michael@0:       if (!depStr.IsEmpty() && aResult) {
michael@0:           aResult->Assign(depStr);
michael@0:       }
michael@0:   }
michael@0: 
michael@0:   return true;
michael@0: }