1998-10-14 14:22:38 +04:00
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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/*
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* JS standard exception implementation.
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*/
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#include "jsstddef.h"
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#include "jstypes.h"
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#include "jsutil.h" /* Added by JSIFY */
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#include "jsprf.h"
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#include "jsapi.h"
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#include "jscntxt.h"
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#include "jsconfig.h"
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#include "jsexn.h"
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1998-11-05 03:08:43 +03:00
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#include "jsfun.h"
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1998-10-14 14:22:38 +04:00
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#if JS_HAS_ERROR_EXCEPTIONS
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#if !JS_HAS_EXCEPTIONS
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# error "JS_HAS_EXCEPTIONS must be defined to use JS_HAS_ERROR_EXCEPTIONS"
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#endif
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1998-11-05 03:08:43 +03:00
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/* Declaration to resolve circular reference of exn_class by Exception. */
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static JSBool
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Exception(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval);
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static void
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exn_finalize(JSContext *cx, JSObject *obj);
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static JSClass exn_class = {
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"Exception",
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JSCLASS_HAS_PRIVATE,
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JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
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JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, exn_finalize,
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NULL, NULL, NULL, Exception
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};
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1998-10-14 14:22:38 +04:00
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/*
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1998-11-05 03:08:43 +03:00
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* A copy of the JSErrorReport originally generated.
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1998-10-14 14:22:38 +04:00
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*/
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typedef struct JSExnPrivate {
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JSErrorReport *errorReport;
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} JSExnPrivate;
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/*
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* Copy everything interesting about an error into allocated memory.
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*/
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static JSExnPrivate *
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1998-11-05 03:08:43 +03:00
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exn_initPrivate(JSContext *cx, JSErrorReport *report)
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1998-10-14 14:22:38 +04:00
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{
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JSExnPrivate *newPrivate;
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1998-11-05 03:08:43 +03:00
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JSErrorReport *newReport;
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1998-10-14 14:22:38 +04:00
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newPrivate = (JSExnPrivate *)JS_malloc(cx, sizeof (JSExnPrivate));
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/* Copy the error report */
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newReport = (JSErrorReport *)JS_malloc(cx, sizeof (JSErrorReport));
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1998-11-05 03:08:43 +03:00
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if (report->filename != NULL) {
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1998-10-14 14:22:38 +04:00
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newReport->filename =
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(const char *)JS_malloc(cx, strlen(report->filename)+1);
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strcpy((char *)newReport->filename, report->filename);
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} else {
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newReport->filename = NULL;
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}
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newReport->lineno = report->lineno;
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/*
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* We don't need to copy linebuf and tokenptr, because they
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* point into the deflated string cache. (currently?)
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*/
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newReport->linebuf = report->linebuf;
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newReport->tokenptr = report->tokenptr;
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/*
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* But we do need to copy uclinebuf, uctokenptr, because they're
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* pointers into internal tokenstream structs, and may go away.
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*
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* NOTE nothing uses this and I'm not really maintaining it until
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* I know it's the desired API.
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*/
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1998-11-05 03:08:43 +03:00
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if (report->uclinebuf != NULL) {
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1999-04-27 19:18:57 +04:00
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jsint len = js_strlen(report->uclinebuf) + 1;
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1998-10-14 14:22:38 +04:00
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newReport->uclinebuf =
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1998-11-05 03:08:43 +03:00
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(const jschar *)JS_malloc(cx, len * sizeof(jschar));
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1999-04-27 19:18:57 +04:00
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js_strncpy((jschar *)newReport->uclinebuf, report->uclinebuf, len);
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1998-10-14 14:22:38 +04:00
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newReport->uctokenptr = newReport->uclinebuf + (report->uctokenptr -
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report->uclinebuf);
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} else
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newReport->uclinebuf = newReport->uctokenptr = NULL;
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1999-04-27 19:18:57 +04:00
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1998-11-05 03:08:43 +03:00
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if (report->ucmessage != NULL) {
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1999-04-27 19:18:57 +04:00
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jsint len = js_strlen(report->ucmessage) + 1;
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1998-11-05 03:08:43 +03:00
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newReport->ucmessage = (const jschar *)JS_malloc(cx, len);
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js_strncpy((jschar *)newReport->ucmessage, report->ucmessage, len);
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if (report->messageArgs) {
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1999-04-27 19:18:57 +04:00
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intN i;
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1998-11-05 03:08:43 +03:00
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for (i = 0; report->messageArgs[i] != NULL; i++)
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;
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JS_ASSERT(i);
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newReport->messageArgs =
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(const jschar **)JS_malloc(cx, (i + 1) * sizeof(jschar *));
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for (i = 0; report->messageArgs[i] != NULL; i++) {
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len = js_strlen(report->messageArgs[i]) + 1;
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newReport->messageArgs[i] =
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(const jschar *)JS_malloc(cx, len * sizeof(jschar));
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js_strncpy((jschar *)(newReport->messageArgs[i]),
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report->messageArgs[i], len);
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}
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report->messageArgs[i] = NULL;
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} else {
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report->messageArgs = NULL;
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}
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} else {
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newReport->ucmessage = NULL;
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newReport->messageArgs = NULL;
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}
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1999-04-27 19:18:57 +04:00
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newReport->errorNumber = report->errorNumber;
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1998-11-05 03:08:43 +03:00
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1998-10-14 14:22:38 +04:00
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/* Note that this is before it gets flagged with JSREPORT_EXCEPTION */
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newReport->flags = report->flags;
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newPrivate->errorReport = newReport;
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return newPrivate;
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}
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/*
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* Undo all the damage done by exn_initPrivate.
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*/
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static void
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exn_destroyPrivate(JSContext *cx, JSExnPrivate *privateData)
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{
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1998-11-05 03:08:43 +03:00
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JSErrorReport *report;
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const jschar **args;
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report = privateData->errorReport;
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JS_ASSERT(report);
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if (report->uclinebuf)
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JS_free(cx, (void *)report->uclinebuf);
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if (report->filename)
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JS_free(cx, (void *)report->filename);
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if (report->ucmessage)
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JS_free(cx, (void *)report->ucmessage);
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if (report->messageArgs) {
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args = report->messageArgs;
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1999-04-27 19:18:57 +04:00
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while(*args != NULL)
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JS_free(cx, (void *)*args++);
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1998-11-05 03:08:43 +03:00
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JS_free(cx, (void *)report->messageArgs);
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}
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JS_free(cx, report);
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1998-10-14 14:22:38 +04:00
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JS_free(cx, privateData);
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}
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static void
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exn_finalize(JSContext *cx, JSObject *obj)
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{
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JSExnPrivate *privateData;
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1998-11-05 03:08:43 +03:00
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jsval private;
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1998-10-14 14:22:38 +04:00
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1998-11-05 03:08:43 +03:00
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private = OBJ_GET_SLOT(cx, obj, JSSLOT_PRIVATE);
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1998-10-14 14:22:38 +04:00
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1998-11-05 03:08:43 +03:00
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if (private != JSVAL_NULL) {
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privateData = JSVAL_TO_PRIVATE(private);
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if (privateData)
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exn_destroyPrivate(cx, privateData);
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1998-10-14 14:22:38 +04:00
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}
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}
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1998-11-05 03:08:43 +03:00
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static JSErrorReport *
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js_ErrorFromException(JSContext *cx, jsval exn)
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{
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JSObject *obj;
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JSExnPrivate *privateData;
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jsval private;
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if (!JSVAL_IS_OBJECT(exn))
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return NULL;
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obj = JSVAL_TO_OBJECT(exn);
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if (OBJ_GET_CLASS(cx, obj) != &exn_class)
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return NULL;
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private = OBJ_GET_SLOT(cx, obj, JSSLOT_PRIVATE);
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privateData = JSVAL_TO_PRIVATE(OBJ_GET_SLOT(cx, obj, JSSLOT_PRIVATE));
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if (!privateData)
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return NULL;
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JS_ASSERT(privateData->errorReport);
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return privateData->errorReport;
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}
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1998-10-14 14:22:38 +04:00
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/* This must be kept in synch with the exceptions array below. */
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typedef enum JSExnType {
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JSEXN_NONE = -1,
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JSEXN_EXCEPTION,
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JSEXN_ERR,
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JSEXN_INTERNALERR,
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JSEXN_SYNTAXERR,
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JSEXN_REFERENCEERR,
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JSEXN_CALLERR,
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JSEXN_TARGETERR,
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JSEXN_CONSTRUCTORERR,
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JSEXN_CONVERSIONERR,
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JSEXN_TOOBJECTERR,
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JSEXN_TOPRIMITIVEERR,
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JSEXN_DEFAULTVALUEERR,
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JSEXN_ARRAYERR,
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JSEXN_LIMIT
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} JSExnType;
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struct JSExnSpec {
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int protoIndex;
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1998-11-05 03:08:43 +03:00
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const char *name;
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1998-10-14 14:22:38 +04:00
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};
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static struct JSExnSpec exceptions[] = {
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1998-11-05 03:08:43 +03:00
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{ JSEXN_NONE, "Exception" },
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{ JSEXN_EXCEPTION, "Error" },
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{ JSEXN_ERR, "InternalError" },
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{ JSEXN_ERR, "SyntaxError" },
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{ JSEXN_ERR, "ReferenceError" },
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{ JSEXN_ERR, "CallError" },
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{ JSEXN_CALLERR, "TargetError" },
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{ JSEXN_ERR, "ConstructorError" },
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{ JSEXN_ERR, "ConversionError" },
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{ JSEXN_CONVERSIONERR, "ToObjectError" },
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{ JSEXN_CONVERSIONERR, "ToPrimitiveError" },
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{ JSEXN_CONVERSIONERR, "DefaultValueError" },
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{ JSEXN_ERR, "ArrayError" },
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1998-10-14 14:22:38 +04:00
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{0}
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};
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static JSBool
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Exception(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
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{
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1998-11-05 03:08:43 +03:00
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JSString *message;
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/*
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* Does it make sense to throw a not-a-function-error here?
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* A constructor that was not a function would be novel.
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*/
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1998-10-14 14:22:38 +04:00
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if (!cx->fp->constructing) {
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return JS_TRUE;
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}
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1998-11-05 03:08:43 +03:00
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/*
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* If it's a new object of class Exception, then null out the private
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* data so that the finalizer doesn't attempt to free it.
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*/
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if (OBJ_GET_CLASS(cx, obj) == &exn_class)
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OBJ_SET_SLOT(cx, obj, JSSLOT_PRIVATE, JSVAL_NULL);
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/*
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* Set the 'message' property.
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*/
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if (argc > 0) {
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message = js_ValueToString(cx, argv[0]);
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if (!message)
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return JS_FALSE;
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} else {
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message = cx->runtime->emptyString;
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}
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if (!JS_DefineProperty(cx, obj, "message", STRING_TO_JSVAL(message),
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NULL, NULL, JSPROP_ENUMERATE));
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1998-10-14 14:22:38 +04:00
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return JS_TRUE;
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}
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/*
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1998-11-05 03:08:43 +03:00
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* Convert to string.
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1998-10-14 14:22:38 +04:00
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*
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1998-11-05 03:08:43 +03:00
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* This method only uses JavaScript-modifiable properties name, message; it is
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* left to the host to check for private data and report filename and line
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* number information along with this message.
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1998-10-14 14:22:38 +04:00
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*/
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static JSBool
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exn_toString(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
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{
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jsval v;
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1998-11-05 03:08:43 +03:00
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JSString *name, *message, *result;
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jschar *chars, *cp;
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size_t length;
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jsid id;
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id = (jsid) cx->runtime->atomState.nameAtom;
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if (!OBJ_GET_PROPERTY(cx, obj, id, &v) || !(name = js_ValueToString(cx, v)))
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return JS_FALSE;
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if (!JS_GetProperty(cx, obj, "message", &v) ||
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!(message = js_ValueToString(cx, v)))
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return JS_FALSE;
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if (message->length > 0) {
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length = name->length + message->length + 2;
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cp = chars = JS_malloc(cx, (length + 1) * sizeof(jschar));
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if (!chars)
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return JS_FALSE;
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js_strncpy(cp, name->chars, name->length);
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cp += name->length;
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*cp++ = ':'; *cp++ = ' ';
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js_strncpy(cp, message->chars, message->length);
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cp += message->length;
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*cp = 0;
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result = js_NewString(cx, chars, length, 0);
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if (!result) {
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JS_free(cx, chars);
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return JS_FALSE;
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}
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1998-10-14 14:22:38 +04:00
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} else {
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1998-11-05 03:08:43 +03:00
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result = name;
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1998-10-14 14:22:38 +04:00
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}
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1998-11-05 03:08:43 +03:00
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*rval = STRING_TO_JSVAL(result);
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1998-10-14 14:22:38 +04:00
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return JS_TRUE;
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}
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1998-11-05 03:08:43 +03:00
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#if JS_HAS_TOSOURCE
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/*
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* Return a string that may eval to something similar to the original object.
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*/
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static JSBool
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exn_toSource(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
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{
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JSString *name, *message, *result;
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jschar *chars, *cp;
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jsid id;
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size_t length;
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jsval v;
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id = (jsid) cx->runtime->atomState.nameAtom;
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if (!OBJ_GET_PROPERTY(cx, obj, id, &v) || !(name = js_ValueToString(cx, v)))
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return JS_FALSE;
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if (!JS_GetProperty(cx, obj, "message", &v) ||
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!(message = js_ValueToString(cx, v)))
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return JS_FALSE;
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length = (message->length > 0) ? name->length + message->length + 10
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: name->length + 8;
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cp = chars = JS_malloc(cx, (length + 1) * sizeof(jschar));
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if (!chars)
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return JS_FALSE;
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*cp++ = '('; *cp++ = 'n'; *cp++ = 'e'; *cp++ = 'w'; *cp++ = ' ';
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js_strncpy(cp, name->chars, name->length);
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cp += name->length;
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*cp++ = '(';
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if (message->length > 0) {
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*cp++ = '"';
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js_strncpy(cp, message->chars, message->length);
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cp += message->length;
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*cp++ = '"';
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}
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*cp++ = ')'; *cp++ = ')'; *cp = 0;
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result = js_NewString(cx, chars, length, 0);
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if (!result) {
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JS_free(cx, chars);
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return JS_FALSE;
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}
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*rval = STRING_TO_JSVAL(result);
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return JS_TRUE;
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}
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#endif
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1998-10-14 14:22:38 +04:00
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static JSFunctionSpec exception_methods[] = {
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1998-11-05 03:08:43 +03:00
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#if JS_HAS_TOSOURCE
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{js_toSource_str, exn_toSource, 0},
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#endif
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1998-10-14 14:22:38 +04:00
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{js_toString_str, exn_toString, 0},
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{0}
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};
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JSObject *
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js_InitExceptionClasses(JSContext *cx, JSObject *obj)
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{
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int i;
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1998-11-05 03:08:43 +03:00
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JSObject *protos[JSEXN_LIMIT];
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1998-10-14 14:22:38 +04:00
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1998-11-05 03:08:43 +03:00
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/* Initialize the prototypes first. */
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for (i = 0; exceptions[i].name != 0; i++) {
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JSAtom *atom;
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JSFunction *fun;
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JSString *nameString;
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int protoidx = exceptions[i].protoIndex;
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/* Make the prototype for the current constructor name. */
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protos[i] = js_NewObject(cx, &exn_class,
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protoidx >= 0 ? protos[protoidx] : NULL,
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obj);
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if (!protos[i])
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return NULL;
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atom = js_Atomize(cx, exceptions[i].name, strlen(exceptions[i].name), 0);
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/* Make a constructor function for the current name. */
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fun = js_DefineFunction(cx, obj, atom, Exception, 1, 0);
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if (!fun)
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return NULL; /* XXX also remove named property from obj... */
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/* Make this constructor make objects of class Exception. */
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fun->clasp = &exn_class;
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/* Make the prototype and constructor links. */
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if (!js_SetClassPrototype(cx, fun->object, protos[i],
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JSPROP_READONLY | JSPROP_PERMANENT))
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return NULL;
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/* proto bootstrap bit from JS_InitClass omitted. */
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nameString = JS_NewStringCopyZ(cx, exceptions[i].name);
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if (nameString == NULL)
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return NULL;
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/* Add the name property to the prototype. */
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if (!JS_DefineProperty(cx, protos[i], js_name_str,
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STRING_TO_JSVAL(nameString),
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NULL, NULL,
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JSPROP_ENUMERATE)) {
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/* release it? */
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return NULL;
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}
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/* So finalize knows whether to. */
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OBJ_SET_SLOT(cx, protos[i], JSSLOT_PRIVATE, JSVAL_NULL);
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1998-10-14 14:22:38 +04:00
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}
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1998-11-05 03:08:43 +03:00
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1998-10-14 14:22:38 +04:00
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/*
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1998-11-05 03:08:43 +03:00
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* Add an empty message property. (To Exception.prototype only,
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* because this property will be the same for all the exception
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* protos.)
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1998-10-14 14:22:38 +04:00
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*/
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1998-11-05 03:08:43 +03:00
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if (!JS_DefineProperty(cx, protos[0], "message",
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STRING_TO_JSVAL(cx->runtime->emptyString),
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NULL, NULL, JSPROP_ENUMERATE))
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return NULL;
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/*
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* Add methods only to Exception.prototype, because ostensibly all
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* exception types delegate to that.
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*/
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if (!JS_DefineFunctions(cx, protos[0], exception_methods))
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return NULL;
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1998-10-14 14:22:38 +04:00
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return protos[0];
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}
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1998-11-05 03:08:43 +03:00
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static JSExnType errorToExceptionNum[] = {
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1998-10-14 14:22:38 +04:00
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#define MSG_DEF(name, number, count, exception, format) \
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exception,
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#include "js.msg"
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#undef MSG_DEF
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};
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#if defined ( DEBUG_mccabe ) && defined ( PRINTNAMES )
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/* For use below... get character strings for error name and exception name */
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static struct exnname { char *name; char *exception; } errortoexnname[] = {
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#define MSG_DEF(name, number, count, exception, format) \
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{#name, #exception},
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#include "js.msg"
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#undef MSG_DEF
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};
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#endif /* DEBUG */
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JSBool
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1998-11-05 03:08:43 +03:00
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js_ErrorToException(JSContext *cx, const char *message, JSErrorReport *reportp)
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1998-10-14 14:22:38 +04:00
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{
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JSErrNum errorNumber;
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1998-11-05 03:08:43 +03:00
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JSObject *errObject, *errProto;
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1998-10-14 14:22:38 +04:00
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JSExnType exn;
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JSExnPrivate *privateData;
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1998-11-05 03:08:43 +03:00
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JSString *msgstr;
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1998-10-14 14:22:38 +04:00
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1998-11-05 03:08:43 +03:00
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/* Find the exception index associated with this error. */
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1998-10-14 14:22:38 +04:00
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JS_ASSERT(reportp);
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errorNumber = reportp->errorNumber;
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1998-11-05 03:08:43 +03:00
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exn = errorToExceptionNum[errorNumber];
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1998-10-14 14:22:38 +04:00
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JS_ASSERT(exn < JSEXN_LIMIT);
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#if defined( DEBUG_mccabe ) && defined ( PRINTNAMES )
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/* Print the error name and the associated exception name to stderr */
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fprintf(stderr, "%s\t%s\n",
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errortoexnname[errorNumber].name,
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errortoexnname[errorNumber].exception);
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#endif
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/*
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* Return false (no exception raised) if no exception is associated
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* with the given error number.
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*/
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if (exn == JSEXN_NONE)
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return JS_FALSE;
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/*
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1998-11-05 03:08:43 +03:00
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* Try to get an appropriate prototype by looking up the corresponding
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* exception constructor name in the current context. If the constructor
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* has been deleted or overwritten, this may fail or return NULL, and
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* js_NewObject will fall back to using Object.prototype.
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1998-10-14 14:22:38 +04:00
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*/
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1998-11-05 03:08:43 +03:00
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if (!js_GetClassPrototype(cx, exceptions[exn].name, &errProto))
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errProto = NULL;
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/*
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* Use js_NewObject instead of js_ConstructObject, because
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* js_ConstructObject seems to require a frame.
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*/
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errObject = js_NewObject(cx, &exn_class, errProto, NULL);
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/* Store 'message' as a javascript-visible value. */
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msgstr = JS_NewStringCopyZ(cx, message);
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if (!JS_DefineProperty(cx, errObject, "message", STRING_TO_JSVAL(msgstr),
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NULL, NULL,
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JSPROP_ENUMERATE))
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return JS_FALSE;
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1998-10-14 14:22:38 +04:00
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/*
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* Construct a new copy of the error report, and store it in the
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* exception objects' private data. We can't use the error report
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* handed in, because it's stack-allocated, and may point to transient
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* data in the JSTokenStream.
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*/
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1998-11-05 03:08:43 +03:00
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privateData = exn_initPrivate(cx, reportp);
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OBJ_SET_SLOT(cx, errObject, JSSLOT_PRIVATE, PRIVATE_TO_JSVAL(privateData));
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1998-10-14 14:22:38 +04:00
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1998-11-05 03:08:43 +03:00
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/* Set the generated Exception object as the current exception. */
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JS_SetPendingException(cx, OBJECT_TO_JSVAL(errObject));
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1998-10-14 14:22:38 +04:00
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1998-11-05 03:08:43 +03:00
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/* Flag the error report passed in to indicate an exception was raised. */
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1998-10-14 14:22:38 +04:00
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reportp->flags |= JSREPORT_EXCEPTION;
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1998-11-05 03:08:43 +03:00
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1998-10-14 14:22:38 +04:00
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return JS_TRUE;
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}
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#endif /* JS_HAS_ERROR_EXCEPTIONS */
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1998-11-05 03:08:43 +03:00
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#if JS_HAS_EXCEPTIONS
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extern JSBool
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js_ReportUncaughtException(JSContext *cx)
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{
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JSObject *exnObject;
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JSString *str;
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jsval exn;
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JSErrorReport *reportp;
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if (!JS_IsExceptionPending(cx))
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return JS_FALSE;
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if (!JS_GetPendingException(cx, &exn))
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return JS_FALSE;
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/*
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* Because js_ValueToString below could error and an exception object
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* could become unrooted, we root it here.
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*/
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1999-04-27 19:18:57 +04:00
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if (JSVAL_IS_OBJECT(exn) && exn != JSVAL_NULL) {
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1998-11-05 03:08:43 +03:00
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exnObject = JSVAL_TO_OBJECT(exn);
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1999-04-27 19:18:57 +04:00
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if (!js_AddRoot(cx, &exnObject, "exn.report.root"))
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1998-11-05 03:08:43 +03:00
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return JS_FALSE;
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} else {
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exnObject = NULL;
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}
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str = js_ValueToString(cx, exn);
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#if JS_HAS_ERROR_EXCEPTIONS
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reportp = js_ErrorFromException(cx, exn);
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#else
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reportp = NULL;
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#endif
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if (reportp == NULL) {
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/*
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* XXXmccabe todo: Instead of doing this, synthesize an error report
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* struct that includes the filename, lineno where the exception was
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* originally thrown.
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*/
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JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
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JSMSG_UNCAUGHT_EXCEPTION, js_GetStringBytes(str));
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} else {
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/* Flag the error as an exception. */
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reportp->flags |= JSREPORT_EXCEPTION;
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js_ReportErrorAgain(cx, js_GetStringBytes(str), reportp);
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}
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if (exnObject != NULL)
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1999-04-27 19:18:57 +04:00
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js_RemoveRoot(cx, &exnObject);
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1998-11-05 03:08:43 +03:00
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return JS_TRUE;
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}
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#endif /* JS_HAS_EXCEPTIONS */
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