C++ JSAutoByteString类代码示例

static bool
ProcessLine(AutoJSAPI& jsapi, const char* buffer, int startline)
{
    JSContext* cx = jsapi.cx();
    JS::RootedScript script(cx);
    JS::RootedValue result(cx);
    JS::CompileOptions options(cx);
    options.setFileAndLine("typein", startline)
           .setIsRunOnce(true);
    if (!JS_CompileScript(cx, buffer, strlen(buffer), options, &script))
        return false;
    if (compileOnly)
        return true;
    if (!JS_ExecuteScript(cx, script, &result))
        return false;

    if (result.isUndefined())
        return true;
    RootedString str(cx);
    if (!(str = ToString(cx, result)))
        return false;
    JSAutoByteString bytes;
    if (!bytes.encodeLatin1(cx, str))
        return false;

    fprintf(gOutFile, "%s\n", bytes.ptr());
    return true;
}

// static
void
XPCThrower::Verbosify(XPCCallContext& ccx,
                      char** psz, PRBool own)
{
    char* sz = nsnull;

    if(ccx.HasInterfaceAndMember())
    {
        XPCNativeInterface* iface = ccx.GetInterface();
        jsid id = ccx.GetMember()->GetName();
        JSAutoByteString bytes;
        const char *name = JSID_IS_VOID(id) ? "Unknown" : bytes.encode(ccx, JSID_TO_STRING(id));
        if(!name)
        {
            name = "";
        }
        sz = JS_smprintf("%s [%s.%s]", *psz, iface->GetNameString(), name);
    }

    if(sz)
    {
        if(own)
            JS_smprintf_free(*psz);
        *psz = sz;
    }
}

static void
ThrowBadArg(JSContext *cx, nsresult rv, const char *ifaceName,
            jsid memberId, const char *memberName, unsigned paramnum)
{
    /* Only one memberId or memberName should be given. */
    MOZ_ASSERT(JSID_IS_VOID(memberId) != !memberName);

    // From XPCThrower::ThrowBadParam.
    char* sz;
    const char* format;

    if (!nsXPCException::NameAndFormatForNSResult(rv, nullptr, &format))
        format = "";

    JSAutoByteString memberNameBytes;
    if (!memberName) {
        memberName = JSID_IS_STRING(memberId)
                     ? memberNameBytes.encodeLatin1(cx, JSID_TO_STRING(memberId))
                     : "unknown";
    }
    sz = JS_smprintf("%s arg %u [%s.%s]",
                     format, (unsigned int) paramnum, ifaceName, memberName);

    dom::Throw(cx, rv, sz);

    if (sz)
        JS_smprintf_free(sz);
}

/* |callee| requires a usage string provided by JS_DefineFunctionsWithHelp. */
void
js::ReportUsageErrorASCII(JSContext* cx, HandleObject callee, const char* msg)
{
    const char* usageStr = "usage";
    PropertyName* usageAtom = Atomize(cx, usageStr, strlen(usageStr))->asPropertyName();
    RootedId id(cx, NameToId(usageAtom));
    DebugOnly<Shape*> shape = static_cast<Shape*>(callee->as<JSFunction>().lookup(cx, id));
    MOZ_ASSERT(!shape->configurable());
    MOZ_ASSERT(!shape->writable());
    MOZ_ASSERT(shape->hasDefaultGetter());

    RootedValue usage(cx);
    if (!JS_GetProperty(cx, callee, "usage", &usage))
        return;

    if (!usage.isString()) {
        JS_ReportErrorASCII(cx, "%s", msg);
    } else {
        RootedString usageStr(cx, usage.toString());
        JSAutoByteString str;
        if (!str.encodeUtf8(cx, usageStr))
            return;
        JS_ReportErrorUTF8(cx, "%s. Usage: %s", msg, str.ptr());
    }
}

static JSBool
DumpHeapComplete(JSContext *cx, unsigned argc, jsval *vp)
{
    const char *fileName = NULL;
    JSAutoByteString fileNameBytes;
    if (argc > 0) {
        Value v = JS_ARGV(cx, vp)[0];
        if (v.isString()) {
            JSString *str = v.toString();
            if (!fileNameBytes.encodeLatin1(cx, str))
                return false;
            fileName = fileNameBytes.ptr();
        }
    }

    FILE *dumpFile;
    if (!fileName) {
        dumpFile = stdout;
    } else {
        dumpFile = fopen(fileName, "w");
        if (!dumpFile) {
            JS_ReportError(cx, "can't open %s", fileName);
            return false;
        }
    }

    js::DumpHeapComplete(JS_GetRuntime(cx), dumpFile);

    fclose(dumpFile);

    JS_SET_RVAL(cx, vp, JSVAL_VOID);
    return true;
}

static inline void
ReportInvalidTrapResult(JSContext* cx, JSObject* proxy, JSAtom* atom)
{
    RootedValue v(cx, ObjectOrNullValue(proxy));
    JSAutoByteString bytes;
    if (!AtomToPrintableString(cx, atom, &bytes))
        return;
    ReportValueError2(cx, JSMSG_INVALID_TRAP_RESULT, JSDVG_IGNORE_STACK, v,
                      nullptr, bytes.ptr());
}

static bool
DumpHeapComplete(JSContext *cx, unsigned argc, jsval *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    DumpHeapNurseryBehaviour nurseryBehaviour = js::IgnoreNurseryObjects;
    FILE *dumpFile = nullptr;

    unsigned i = 0;
    if (argc > i) {
        Value v = args[i];
        if (v.isString()) {
            JSString *str = v.toString();
            bool same = false;
            if (!JS_StringEqualsAscii(cx, str, "collectNurseryBeforeDump", &same))
                return false;
            if (same) {
                nurseryBehaviour = js::CollectNurseryBeforeDump;
                ++i;
            }
        }
    }

    if (argc > i) {
        Value v = args[i];
        if (v.isString()) {
            if (!fuzzingSafe) {
                JSString *str = v.toString();
                JSAutoByteString fileNameBytes;
                if (!fileNameBytes.encodeLatin1(cx, str))
                    return false;
                const char *fileName = fileNameBytes.ptr();
                dumpFile = fopen(fileName, "w");
                if (!dumpFile) {
                    JS_ReportError(cx, "can't open %s", fileName);
                    return false;
                }
            }
            ++i;
        }
    }

    if (i != argc) {
        JS_ReportError(cx, "bad arguments passed to dumpHeapComplete");
        return false;
    }

    js::DumpHeapComplete(JS_GetRuntime(cx), dumpFile ? dumpFile : stdout, nurseryBehaviour);

    if (dumpFile)
        fclose(dumpFile);

    JS_SET_RVAL(cx, vp, JSVAL_VOID);
    return true;
}

bool
ModuleBuilder::appendLocalExportEntry(HandleExportEntryObject exp)
{
    if (!module_->initialEnvironment().lookup(cx_, AtomToId(exp->localName()))) {
        JSAutoByteString str;
        str.encodeLatin1(cx_, exp->localName());
        JS_ReportErrorNumber(cx_, GetErrorMessage, nullptr, JSMSG_MISSING_EXPORT, str.ptr());
        return false;
    }

    return localExportEntries_.append(exp);
}

static bool
ThrowCallFailed(JSContext *cx, nsresult rv,
                const char *ifaceName, HandleId memberId, const char *memberName)
{
    /* Only one of memberId or memberName should be given. */
    MOZ_ASSERT(JSID_IS_VOID(memberId) != !memberName);

    // From XPCThrower::ThrowBadResult.
    char* sz;
    const char* format;
    const char* name;

    /*
     *  If there is a pending exception when the native call returns and
     *  it has the same error result as returned by the native call, then
     *  the native call may be passing through an error from a previous JS
     *  call. So we'll just throw that exception into our JS.
     */
    if (XPCThrower::CheckForPendingException(rv, cx))
        return false;

    // else...

    if (!nsXPCException::NameAndFormatForNSResult(NS_ERROR_XPC_NATIVE_RETURNED_FAILURE, nullptr, &format) ||
        !format) {
        format = "";
    }

    JSAutoByteString memberNameBytes;
    if (!memberName) {
        memberName = JSID_IS_STRING(memberId)
                     ? memberNameBytes.encodeLatin1(cx, JSID_TO_STRING(memberId))
                     : "unknown";
    }
    if (nsXPCException::NameAndFormatForNSResult(rv, &name, nullptr)
        && name) {
        sz = JS_smprintf("%s 0x%x (%s) [%s.%s]",
                         format, rv, name, ifaceName, memberName);
    } else {
        sz = JS_smprintf("%s 0x%x [%s.%s]",
                         format, rv, ifaceName, memberName);
    }

    XPCThrower::BuildAndThrowException(cx, rv, sz);

    if (sz)
        JS_smprintf_free(sz);

    return false;
}

static bool
ThrowCallFailed(JSContext *cx, nsresult rv,
                const char *ifaceName, HandleId memberId, const char *memberName)
{
    /* Only one of memberId or memberName should be given. */
    MOZ_ASSERT(JSID_IS_VOID(memberId) != !memberName);

    // From XPCThrower::ThrowBadResult.
    char* sz;
    const char* format;
    const char* name;

    // If the cx already has a pending exception, just throw that.
    //
    // We used to check here to make sure the exception matched rv (whatever
    // that means). But this meant that we'd be calling into JSAPI below with
    // a pending exception, which isn't really kosher. The first exception thrown
    // should generally take precedence anyway.
    if (JS_IsExceptionPending(cx))
        return false;

    // else...

    if (!nsXPCException::NameAndFormatForNSResult(NS_ERROR_XPC_NATIVE_RETURNED_FAILURE, nullptr, &format) ||
        !format) {
        format = "";
    }

    JSAutoByteString memberNameBytes;
    if (!memberName) {
        memberName = JSID_IS_STRING(memberId)
                     ? memberNameBytes.encodeLatin1(cx, JSID_TO_STRING(memberId))
                     : "unknown";
    }
    if (nsXPCException::NameAndFormatForNSResult(rv, &name, nullptr)
        && name) {
        sz = JS_smprintf("%s 0x%x (%s) [%s.%s]",
                         format, rv, name, ifaceName, memberName);
    } else {
        sz = JS_smprintf("%s 0x%x [%s.%s]",
                         format, rv, ifaceName, memberName);
    }

    dom::Throw(cx, rv, sz);

    if (sz)
        JS_smprintf_free(sz);

    return false;
}

static JSBool
perlsub_construct(
    JSContext *cx,
    DEFJSFSARGS_
) {
    dTHX;
    DECJSFSARGS;
    JSObject *func = JSVAL_TO_OBJECT(JS_ARGV_CALLEE(argv));
    SV *callee = (SV *)JS_GetPrivate(cx, func);
    SV *caller = NULL;
#if JS_VERSION < 185
    JSObject *This = JSVAL_TO_OBJECT(argv[-1]);
#else
    JSObject *This = JS_NewObjectForConstructor(cx, vp);
#endif
    JSObject *proto = JS_GetPrototype(cx, This);

    PJS_DEBUG1("Want construct, This is a %s", PJS_GET_CLASS(cx, This)->name);
    if(PJS_GET_CLASS(cx, proto) == &perlpackage_class ||
       ( JS_LookupProperty(cx, func, "prototype", &argv[-1])
         && JSVAL_IS_OBJECT(argv[-1]) && !JSVAL_IS_NULL(argv[-1])
         && (proto = JS_GetPrototype(cx, JSVAL_TO_OBJECT(argv[-1]))) 
         && strEQ(PJS_GET_CLASS(cx, proto)->name, PJS_PACKAGE_CLASS_NAME))
    ) {
	SV *rsv = NULL;
	char *pkgname = PJS_GetPackageName(aTHX_ cx, proto);
#if JS_VERSION >= 185
	JSAutoByteString bytes;
	bytes.initBytes(pkgname);
#endif
	caller = newSVpv(pkgname, 0);

	argv[-1] = OBJECT_TO_JSVAL(This);
	if(!PJS_Call_sv_with_jsvals_rsv(aTHX_ cx, obj, callee, caller,
	                                argc, argv, &rsv, G_SCALAR))
	    return JS_FALSE;

	if(SvROK(rsv) && sv_derived_from(rsv, pkgname)) {
	    JSObject *newobj = PJS_NewPerlObject(aTHX_ cx, JS_GetParent(cx, func), rsv);
	    *rval = OBJECT_TO_JSVAL(newobj);
	    return JS_TRUE;
	}
	JS_ReportError(cx, "%s's constructor don't return an object",
	               SvPV_nolen(caller));
    }
    else JS_ReportError(cx, "Can't use as a constructor"); // Yet! ;-)

    return JS_FALSE;
}

JSBool
xpc_DumpEvalInJSStackFrame(JSContext* cx, JSUint32 frameno, const char* text)
{
    JSStackFrame* fp;
    JSStackFrame* iter = nsnull;
    JSUint32 num = 0;

    if(!cx || !text)
    {
        puts("invalid params passed to xpc_DumpEvalInJSStackFrame!");
        return JS_FALSE;
    }

    printf("js[%d]> %s\n", frameno, text);

    while(nsnull != (fp = JS_FrameIterator(cx, &iter)))
    {
        if(num == frameno)
            break;
        num++;
    }

    if(!fp)
    {
        puts("invalid frame number!");
        return JS_FALSE;
    }

    JSAutoRequest ar(cx);

    JSExceptionState* exceptionState = JS_SaveExceptionState(cx);
    JSErrorReporter older = JS_SetErrorReporter(cx, xpcDumpEvalErrorReporter);

    jsval rval;
    JSString* str;
    JSAutoByteString bytes;
    if(JS_EvaluateInStackFrame(cx, fp, text, strlen(text), "eval", 1, &rval) &&
       nsnull != (str = JS_ValueToString(cx, rval)) &&
       bytes.encode(cx, str))
    {
        printf("%s\n", bytes.ptr());
    }
    else
        puts("eval failed!");
    JS_SetErrorReporter(cx, older);
    JS_RestoreExceptionState(cx, exceptionState);
    return JS_TRUE;
}

JSBool
xpc_DumpEvalInJSStackFrame(JSContext* cx, uint32_t frameno, const char* text)
{
    if (!cx || !text) {
        DebugDump("%s", "invalid params passed to xpc_DumpEvalInJSStackFrame!\n");
        return false;
    }

    DebugDump("js[%d]> %s\n", frameno, text);

    uint32_t num = 0;

    JSAbstractFramePtr frame = JSNullFramePtr();

    JSBrokenFrameIterator iter(cx);
    while (!iter.done()) {
        if (num == frameno) {
            frame = iter.abstractFramePtr();
            break;
        }
        ++iter;
        num++;
    }

    if (!frame) {
        DebugDump("%s", "invalid frame number!\n");
        return false;
    }

    JSAutoRequest ar(cx);

    JSExceptionState* exceptionState = JS_SaveExceptionState(cx);
    JSErrorReporter older = JS_SetErrorReporter(cx, xpcDumpEvalErrorReporter);

    jsval rval;
    JSString* str;
    JSAutoByteString bytes;
    if (frame.evaluateInStackFrame(cx, text, strlen(text), "eval", 1, &rval) &&
        nullptr != (str = JS_ValueToString(cx, rval)) &&
        bytes.encode(cx, str)) {
        DebugDump("%s\n", bytes.ptr());
    } else
        DebugDump("%s", "eval failed!\n");
    JS_SetErrorReporter(cx, older);
    JS_RestoreExceptionState(cx, exceptionState);
    return true;
}

/* |callee| requires a usage string provided by JS_DefineFunctionsWithHelp. */
void
js::ReportUsageErrorASCII(JSContext* cx, HandleObject callee, const char* msg)
{
    RootedValue usage(cx);
    if (!JS_GetProperty(cx, callee, "usage", &usage))
        return;

    if (!usage.isString()) {
        JS_ReportErrorASCII(cx, "%s", msg);
    } else {
        RootedString usageStr(cx, usage.toString());
        JSAutoByteString str;
        if (!str.encodeUtf8(cx, usageStr))
            return;
        JS_ReportErrorUTF8(cx, "%s. Usage: %s", msg, str.ptr());
    }
}

// static
void
XPCThrower::Verbosify(XPCCallContext& ccx,
                      char** psz, PRBool own)
{
    char* sz = nsnull;

    if(ccx.HasInterfaceAndMember())
    {
        XPCNativeInterface* iface = ccx.GetInterface();
        jsid id = JSID_VOID;
#ifdef XPC_IDISPATCH_SUPPORT
        NS_ASSERTION(ccx.GetIDispatchMember() == nsnull || 
                        ccx.GetMember() == nsnull,
                     "Both IDispatch member and regular XPCOM member "
                     "were set in XPCCallContext");
        if(ccx.GetIDispatchMember())
        {
            XPCDispInterface::Member * member = 
                reinterpret_cast<XPCDispInterface::Member*>(ccx.GetIDispatchMember());
            if(member && JSID_IS_STRING(member->GetName()))
            {
                id = member->GetName();
            }
        }
        else
#endif
        {
            id = ccx.GetMember()->GetName();
        }
        JSAutoByteString bytes;
        const char *name = JSID_IS_VOID(id) ? "Unknown" : bytes.encode(ccx, JSID_TO_STRING(id));
        if(!name)
        {
            name = "";
        }
        sz = JS_smprintf("%s [%s.%s]", *psz, iface->GetNameString(), name);
    }

    if(sz)
    {
        if(own)
            JS_smprintf_free(*psz);
        *psz = sz;
    }
}