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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
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* vim: set ts=8 sw=4 et tw=78: |
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* |
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* ***** BEGIN LICENSE BLOCK ***** |
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1 |
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* |
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* The contents of this file are subject to the Mozilla Public License Version |
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* 1.1 (the "License"); you may not use this file except in compliance with |
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* the License. You may obtain a copy of the License at |
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* http://www.mozilla.org/MPL/ |
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* |
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* Software distributed under the License is distributed on an "AS IS" basis, |
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License |
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* for the specific language governing rights and limitations under the |
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* License. |
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* |
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* The Original Code is Mozilla Communicator client code, released |
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* March 31, 1998. |
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* |
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* The Initial Developer of the Original Code is |
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* Netscape Communications Corporation. |
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* Portions created by the Initial Developer are Copyright (C) 1998 |
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* the Initial Developer. All Rights Reserved. |
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* |
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* Contributor(s): |
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* |
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* Alternatively, the contents of this file may be used under the terms of |
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* either of the GNU General Public License Version 2 or later (the "GPL"), |
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), |
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* in which case the provisions of the GPL or the LGPL are applicable instead |
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* of those above. If you wish to allow use of your version of this file only |
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* under the terms of either the GPL or the LGPL, and not to allow others to |
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* use your version of this file under the terms of the MPL, indicate your |
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* decision by deleting the provisions above and replace them with the notice |
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* and other provisions required by the GPL or the LGPL. If you do not delete |
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* the provisions above, a recipient may use your version of this file under |
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* the terms of any one of the MPL, the GPL or the LGPL. |
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* |
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* ***** END LICENSE BLOCK ***** */ |
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|
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/* |
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* JS standard exception implementation. |
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*/ |
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|
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#include "jsstddef.h" |
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#include <stdlib.h> |
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#include <string.h> |
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#include "jstypes.h" |
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#include "jsbit.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 "jsversion.h" |
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#include "jsdbgapi.h" |
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#include "jsexn.h" |
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#include "jsfun.h" |
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#include "jsinterp.h" |
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#include "jsnum.h" |
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#include "jsobj.h" |
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#include "jsopcode.h" |
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#include "jsscope.h" |
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#include "jsscript.h" |
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#include "jsstaticcheck.h" |
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|
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/* Forward declarations for js_ErrorClass's initializer. */ |
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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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static void |
71 |
exn_finalize(JSContext *cx, JSObject *obj); |
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|
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static void |
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exn_trace(JSTracer *trc, JSObject *obj); |
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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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static JSBool |
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exn_enumerate(JSContext *cx, JSObject *obj); |
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|
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static JSBool |
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exn_resolve(JSContext *cx, JSObject *obj, jsval id, uintN flags, |
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JSObject **objp); |
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|
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JSClass js_ErrorClass = { |
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js_Error_str, |
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JSCLASS_HAS_PRIVATE | JSCLASS_NEW_RESOLVE | JSCLASS_MARK_IS_TRACE | |
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JSCLASS_HAS_CACHED_PROTO(JSProto_Error), |
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JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, |
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exn_enumerate, (JSResolveOp)exn_resolve, JS_ConvertStub, exn_finalize, |
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NULL, NULL, NULL, Exception, |
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NULL, NULL, JS_CLASS_TRACE(exn_trace), NULL |
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}; |
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|
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typedef struct JSStackTraceElem { |
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JSString *funName; |
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size_t argc; |
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const char *filename; |
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uintN ulineno; |
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} JSStackTraceElem; |
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|
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typedef struct JSExnPrivate { |
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/* A copy of the JSErrorReport originally generated. */ |
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JSErrorReport *errorReport; |
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JSString *message; |
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JSString *filename; |
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uintN lineno; |
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size_t stackDepth; |
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JSStackTraceElem stackElems[1]; |
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} JSExnPrivate; |
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|
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static JSString * |
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StackTraceToString(JSContext *cx, JSExnPrivate *priv); |
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|
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static JSErrorReport * |
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CopyErrorReport(JSContext *cx, JSErrorReport *report) |
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{ |
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/* |
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* We use a single malloc block to make a deep copy of JSErrorReport with |
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* the following layout: |
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* JSErrorReport |
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* array of copies of report->messageArgs |
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* jschar array with characters for all messageArgs |
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* jschar array with characters for ucmessage |
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* jschar array with characters for uclinebuf and uctokenptr |
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* char array with characters for linebuf and tokenptr |
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* char array with characters for filename |
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* Such layout together with the properties enforced by the following |
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* asserts does not need any extra alignment padding. |
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*/ |
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JS_STATIC_ASSERT(sizeof(JSErrorReport) % sizeof(const char *) == 0); |
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JS_STATIC_ASSERT(sizeof(const char *) % sizeof(jschar) == 0); |
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|
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size_t filenameSize; |
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size_t linebufSize; |
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size_t uclinebufSize; |
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size_t ucmessageSize; |
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size_t i, argsArraySize, argsCopySize, argSize; |
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size_t mallocSize; |
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JSErrorReport *copy; |
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uint8 *cursor; |
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|
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#define JS_CHARS_SIZE(jschars) ((js_strlen(jschars) + 1) * sizeof(jschar)) |
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|
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filenameSize = report->filename ? strlen(report->filename) + 1 : 0; |
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linebufSize = report->linebuf ? strlen(report->linebuf) + 1 : 0; |
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uclinebufSize = report->uclinebuf ? JS_CHARS_SIZE(report->uclinebuf) : 0; |
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ucmessageSize = 0; |
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argsArraySize = 0; |
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argsCopySize = 0; |
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if (report->ucmessage) { |
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ucmessageSize = JS_CHARS_SIZE(report->ucmessage); |
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if (report->messageArgs) { |
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for (i = 0; report->messageArgs[i]; ++i) |
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argsCopySize += JS_CHARS_SIZE(report->messageArgs[i]); |
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|
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/* Non-null messageArgs should have at least one non-null arg. */ |
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JS_ASSERT(i != 0); |
160 |
argsArraySize = (i + 1) * sizeof(const jschar *); |
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} |
162 |
} |
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|
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/* |
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* The mallocSize can not overflow since it represents the sum of the |
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* sizes of already allocated objects. |
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*/ |
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mallocSize = sizeof(JSErrorReport) + argsArraySize + argsCopySize + |
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ucmessageSize + uclinebufSize + linebufSize + filenameSize; |
170 |
cursor = (uint8 *)JS_malloc(cx, mallocSize); |
171 |
if (!cursor) |
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return NULL; |
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|
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copy = (JSErrorReport *)cursor; |
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memset(cursor, 0, sizeof(JSErrorReport)); |
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cursor += sizeof(JSErrorReport); |
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|
178 |
if (argsArraySize != 0) { |
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copy->messageArgs = (const jschar **)cursor; |
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cursor += argsArraySize; |
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for (i = 0; report->messageArgs[i]; ++i) { |
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copy->messageArgs[i] = (const jschar *)cursor; |
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argSize = JS_CHARS_SIZE(report->messageArgs[i]); |
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memcpy(cursor, report->messageArgs[i], argSize); |
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cursor += argSize; |
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} |
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copy->messageArgs[i] = NULL; |
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JS_ASSERT(cursor == (uint8 *)copy->messageArgs[0] + argsCopySize); |
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} |
190 |
|
191 |
if (report->ucmessage) { |
192 |
copy->ucmessage = (const jschar *)cursor; |
193 |
memcpy(cursor, report->ucmessage, ucmessageSize); |
194 |
cursor += ucmessageSize; |
195 |
} |
196 |
|
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if (report->uclinebuf) { |
198 |
copy->uclinebuf = (const jschar *)cursor; |
199 |
memcpy(cursor, report->uclinebuf, uclinebufSize); |
200 |
cursor += uclinebufSize; |
201 |
if (report->uctokenptr) { |
202 |
copy->uctokenptr = copy->uclinebuf + (report->uctokenptr - |
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report->uclinebuf); |
204 |
} |
205 |
} |
206 |
|
207 |
if (report->linebuf) { |
208 |
copy->linebuf = (const char *)cursor; |
209 |
memcpy(cursor, report->linebuf, linebufSize); |
210 |
cursor += linebufSize; |
211 |
if (report->tokenptr) { |
212 |
copy->tokenptr = copy->linebuf + (report->tokenptr - |
213 |
report->linebuf); |
214 |
} |
215 |
} |
216 |
|
217 |
if (report->filename) { |
218 |
copy->filename = (const char *)cursor; |
219 |
memcpy(cursor, report->filename, filenameSize); |
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} |
221 |
JS_ASSERT(cursor + filenameSize == (uint8 *)copy + mallocSize); |
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|
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/* Copy non-pointer members. */ |
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copy->lineno = report->lineno; |
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copy->errorNumber = report->errorNumber; |
226 |
|
227 |
/* Note that this is before it gets flagged with JSREPORT_EXCEPTION */ |
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copy->flags = report->flags; |
229 |
|
230 |
#undef JS_CHARS_SIZE |
231 |
return copy; |
232 |
} |
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|
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static jsval * |
235 |
GetStackTraceValueBuffer(JSExnPrivate *priv) |
236 |
{ |
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/* |
238 |
* We use extra memory after JSExnPrivateInfo.stackElems to store jsvals |
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* that helps to produce more informative stack traces. The following |
240 |
* assert allows us to assume that no gap after stackElems is necessary to |
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* align the buffer properly. |
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*/ |
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JS_STATIC_ASSERT(sizeof(JSStackTraceElem) % sizeof(jsval) == 0); |
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|
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return (jsval *)(priv->stackElems + priv->stackDepth); |
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} |
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|
248 |
static JSBool |
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InitExnPrivate(JSContext *cx, JSObject *exnObject, JSString *message, |
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JSString *filename, uintN lineno, JSErrorReport *report) |
251 |
{ |
252 |
JSSecurityCallbacks *callbacks; |
253 |
JSCheckAccessOp checkAccess; |
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JSErrorReporter older; |
255 |
JSExceptionState *state; |
256 |
jsval callerid, v; |
257 |
JSStackFrame *fp, *fpstop; |
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size_t stackDepth, valueCount, size; |
259 |
JSBool overflow; |
260 |
JSExnPrivate *priv; |
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JSStackTraceElem *elem; |
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jsval *values; |
263 |
|
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JS_ASSERT(OBJ_GET_CLASS(cx, exnObject) == &js_ErrorClass); |
265 |
|
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/* |
267 |
* Prepare stack trace data. |
268 |
* |
269 |
* Set aside any error reporter for cx and save its exception state |
270 |
* so we can suppress any checkAccess failures. Such failures should stop |
271 |
* the backtrace procedure, not result in a failure of this constructor. |
272 |
*/ |
273 |
callbacks = JS_GetSecurityCallbacks(cx); |
274 |
checkAccess = callbacks |
275 |
? callbacks->checkObjectAccess |
276 |
: NULL; |
277 |
older = JS_SetErrorReporter(cx, NULL); |
278 |
state = JS_SaveExceptionState(cx); |
279 |
|
280 |
callerid = ATOM_KEY(cx->runtime->atomState.callerAtom); |
281 |
stackDepth = 0; |
282 |
valueCount = 0; |
283 |
for (fp = cx->fp; fp; fp = fp->down) { |
284 |
if (fp->fun && fp->argv) { |
285 |
v = JSVAL_NULL; |
286 |
if (checkAccess && |
287 |
!checkAccess(cx, fp->callee, callerid, JSACC_READ, &v)) { |
288 |
break; |
289 |
} |
290 |
valueCount += fp->argc; |
291 |
} |
292 |
++stackDepth; |
293 |
} |
294 |
JS_RestoreExceptionState(cx, state); |
295 |
JS_SetErrorReporter(cx, older); |
296 |
fpstop = fp; |
297 |
|
298 |
size = offsetof(JSExnPrivate, stackElems); |
299 |
overflow = (stackDepth > ((size_t)-1 - size) / sizeof(JSStackTraceElem)); |
300 |
size += stackDepth * sizeof(JSStackTraceElem); |
301 |
overflow |= (valueCount > ((size_t)-1 - size) / sizeof(jsval)); |
302 |
size += valueCount * sizeof(jsval); |
303 |
if (overflow) { |
304 |
js_ReportAllocationOverflow(cx); |
305 |
return JS_FALSE; |
306 |
} |
307 |
priv = (JSExnPrivate *)JS_malloc(cx, size); |
308 |
if (!priv) |
309 |
return JS_FALSE; |
310 |
|
311 |
/* |
312 |
* We initialize errorReport with a copy of report after setting the |
313 |
* private slot, to prevent GC accessing a junk value we clear the field |
314 |
* here. |
315 |
*/ |
316 |
priv->errorReport = NULL; |
317 |
priv->message = message; |
318 |
priv->filename = filename; |
319 |
priv->lineno = lineno; |
320 |
priv->stackDepth = stackDepth; |
321 |
|
322 |
values = GetStackTraceValueBuffer(priv); |
323 |
elem = priv->stackElems; |
324 |
for (fp = cx->fp; fp != fpstop; fp = fp->down) { |
325 |
if (!fp->fun) { |
326 |
elem->funName = NULL; |
327 |
elem->argc = 0; |
328 |
} else { |
329 |
elem->funName = fp->fun->atom |
330 |
? ATOM_TO_STRING(fp->fun->atom) |
331 |
: cx->runtime->emptyString; |
332 |
elem->argc = fp->argc; |
333 |
memcpy(values, fp->argv, fp->argc * sizeof(jsval)); |
334 |
values += fp->argc; |
335 |
} |
336 |
elem->ulineno = 0; |
337 |
elem->filename = NULL; |
338 |
if (fp->script) { |
339 |
elem->filename = fp->script->filename; |
340 |
if (fp->regs) |
341 |
elem->ulineno = js_PCToLineNumber(cx, fp->script, fp->regs->pc); |
342 |
} |
343 |
++elem; |
344 |
} |
345 |
JS_ASSERT(priv->stackElems + stackDepth == elem); |
346 |
JS_ASSERT(GetStackTraceValueBuffer(priv) + valueCount == values); |
347 |
|
348 |
STOBJ_SET_SLOT(exnObject, JSSLOT_PRIVATE, PRIVATE_TO_JSVAL(priv)); |
349 |
|
350 |
if (report) { |
351 |
/* |
352 |
* Construct a new copy of the error report struct. We can't use the |
353 |
* error report struct that was passed in, because it's allocated on |
354 |
* the stack, and also because it may point to transient data in the |
355 |
* JSTokenStream. |
356 |
*/ |
357 |
priv->errorReport = CopyErrorReport(cx, report); |
358 |
if (!priv->errorReport) { |
359 |
/* The finalizer realeases priv since it is in the private slot. */ |
360 |
return JS_FALSE; |
361 |
} |
362 |
} |
363 |
|
364 |
return JS_TRUE; |
365 |
} |
366 |
|
367 |
static JSExnPrivate * |
368 |
GetExnPrivate(JSContext *cx, JSObject *obj) |
369 |
{ |
370 |
jsval privateValue; |
371 |
JSExnPrivate *priv; |
372 |
|
373 |
JS_ASSERT(OBJ_GET_CLASS(cx, obj) == &js_ErrorClass); |
374 |
privateValue = OBJ_GET_SLOT(cx, obj, JSSLOT_PRIVATE); |
375 |
if (JSVAL_IS_VOID(privateValue)) |
376 |
return NULL; |
377 |
priv = (JSExnPrivate *)JSVAL_TO_PRIVATE(privateValue); |
378 |
JS_ASSERT(priv); |
379 |
return priv; |
380 |
} |
381 |
|
382 |
static void |
383 |
exn_trace(JSTracer *trc, JSObject *obj) |
384 |
{ |
385 |
JSExnPrivate *priv; |
386 |
JSStackTraceElem *elem; |
387 |
size_t vcount, i; |
388 |
jsval *vp, v; |
389 |
|
390 |
priv = GetExnPrivate(trc->context, obj); |
391 |
if (priv) { |
392 |
if (priv->message) |
393 |
JS_CALL_STRING_TRACER(trc, priv->message, "exception message"); |
394 |
if (priv->filename) |
395 |
JS_CALL_STRING_TRACER(trc, priv->filename, "exception filename"); |
396 |
|
397 |
elem = priv->stackElems; |
398 |
for (vcount = i = 0; i != priv->stackDepth; ++i, ++elem) { |
399 |
if (elem->funName) { |
400 |
JS_CALL_STRING_TRACER(trc, elem->funName, |
401 |
"stack trace function name"); |
402 |
} |
403 |
if (IS_GC_MARKING_TRACER(trc) && elem->filename) |
404 |
js_MarkScriptFilename(elem->filename); |
405 |
vcount += elem->argc; |
406 |
} |
407 |
vp = GetStackTraceValueBuffer(priv); |
408 |
for (i = 0; i != vcount; ++i, ++vp) { |
409 |
v = *vp; |
410 |
JS_CALL_VALUE_TRACER(trc, v, "stack trace argument"); |
411 |
} |
412 |
} |
413 |
} |
414 |
|
415 |
static void |
416 |
exn_finalize(JSContext *cx, JSObject *obj) |
417 |
{ |
418 |
JSExnPrivate *priv; |
419 |
|
420 |
priv = GetExnPrivate(cx, obj); |
421 |
if (priv) { |
422 |
if (priv->errorReport) |
423 |
JS_free(cx, priv->errorReport); |
424 |
JS_free(cx, priv); |
425 |
} |
426 |
} |
427 |
|
428 |
static JSBool |
429 |
exn_enumerate(JSContext *cx, JSObject *obj) |
430 |
{ |
431 |
JSAtomState *atomState; |
432 |
uintN i; |
433 |
JSAtom *atom; |
434 |
JSObject *pobj; |
435 |
JSProperty *prop; |
436 |
|
437 |
JS_STATIC_ASSERT(sizeof(JSAtomState) <= (size_t)(uint16)-1); |
438 |
static const uint16 offsets[] = { |
439 |
(uint16)offsetof(JSAtomState, messageAtom), |
440 |
(uint16)offsetof(JSAtomState, fileNameAtom), |
441 |
(uint16)offsetof(JSAtomState, lineNumberAtom), |
442 |
(uint16)offsetof(JSAtomState, stackAtom), |
443 |
}; |
444 |
|
445 |
atomState = &cx->runtime->atomState; |
446 |
for (i = 0; i != JS_ARRAY_LENGTH(offsets); ++i) { |
447 |
atom = *(JSAtom **)((uint8 *)atomState + offsets[i]); |
448 |
if (!js_LookupProperty(cx, obj, ATOM_TO_JSID(atom), &pobj, &prop)) |
449 |
return JS_FALSE; |
450 |
if (prop) |
451 |
OBJ_DROP_PROPERTY(cx, pobj, prop); |
452 |
} |
453 |
return JS_TRUE; |
454 |
} |
455 |
|
456 |
static JSBool |
457 |
exn_resolve(JSContext *cx, JSObject *obj, jsval id, uintN flags, |
458 |
JSObject **objp) |
459 |
{ |
460 |
JSExnPrivate *priv; |
461 |
JSString *str; |
462 |
JSAtom *atom; |
463 |
JSString *stack; |
464 |
const char *prop; |
465 |
jsval v; |
466 |
|
467 |
*objp = NULL; |
468 |
priv = GetExnPrivate(cx, obj); |
469 |
if (priv && JSVAL_IS_STRING(id)) { |
470 |
str = JSVAL_TO_STRING(id); |
471 |
|
472 |
atom = cx->runtime->atomState.messageAtom; |
473 |
if (str == ATOM_TO_STRING(atom)) { |
474 |
prop = js_message_str; |
475 |
v = STRING_TO_JSVAL(priv->message); |
476 |
goto define; |
477 |
} |
478 |
|
479 |
atom = cx->runtime->atomState.fileNameAtom; |
480 |
if (str == ATOM_TO_STRING(atom)) { |
481 |
prop = js_fileName_str; |
482 |
v = STRING_TO_JSVAL(priv->filename); |
483 |
goto define; |
484 |
} |
485 |
|
486 |
atom = cx->runtime->atomState.lineNumberAtom; |
487 |
if (str == ATOM_TO_STRING(atom)) { |
488 |
prop = js_lineNumber_str; |
489 |
v = INT_TO_JSVAL(priv->lineno); |
490 |
goto define; |
491 |
} |
492 |
|
493 |
atom = cx->runtime->atomState.stackAtom; |
494 |
if (str == ATOM_TO_STRING(atom)) { |
495 |
stack = StackTraceToString(cx, priv); |
496 |
if (!stack) |
497 |
return JS_FALSE; |
498 |
|
499 |
/* Allow to GC all things that were used to build stack trace. */ |
500 |
priv->stackDepth = 0; |
501 |
prop = js_stack_str; |
502 |
v = STRING_TO_JSVAL(stack); |
503 |
goto define; |
504 |
} |
505 |
} |
506 |
return JS_TRUE; |
507 |
|
508 |
define: |
509 |
if (!JS_DefineProperty(cx, obj, prop, v, NULL, NULL, JSPROP_ENUMERATE)) |
510 |
return JS_FALSE; |
511 |
*objp = obj; |
512 |
return JS_TRUE; |
513 |
} |
514 |
|
515 |
JSErrorReport * |
516 |
js_ErrorFromException(JSContext *cx, jsval exn) |
517 |
{ |
518 |
JSObject *obj; |
519 |
JSExnPrivate *priv; |
520 |
|
521 |
if (JSVAL_IS_PRIMITIVE(exn)) |
522 |
return NULL; |
523 |
obj = JSVAL_TO_OBJECT(exn); |
524 |
if (OBJ_GET_CLASS(cx, obj) != &js_ErrorClass) |
525 |
return NULL; |
526 |
priv = GetExnPrivate(cx, obj); |
527 |
if (!priv) |
528 |
return NULL; |
529 |
return priv->errorReport; |
530 |
} |
531 |
|
532 |
struct JSExnSpec { |
533 |
int protoIndex; |
534 |
const char *name; |
535 |
JSProtoKey key; |
536 |
JSNative native; |
537 |
}; |
538 |
|
539 |
/* |
540 |
* All *Error constructors share the same JSClass, js_ErrorClass. But each |
541 |
* constructor function for an *Error class must have a distinct native 'call' |
542 |
* function pointer, in order for instanceof to work properly across multiple |
543 |
* standard class sets. See jsfun.c:fun_hasInstance. |
544 |
*/ |
545 |
#define MAKE_EXCEPTION_CTOR(name) \ |
546 |
static JSBool \ |
547 |
name(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) \ |
548 |
{ \ |
549 |
return Exception(cx, obj, argc, argv, rval); \ |
550 |
} |
551 |
|
552 |
MAKE_EXCEPTION_CTOR(Error) |
553 |
MAKE_EXCEPTION_CTOR(InternalError) |
554 |
MAKE_EXCEPTION_CTOR(EvalError) |
555 |
MAKE_EXCEPTION_CTOR(RangeError) |
556 |
MAKE_EXCEPTION_CTOR(ReferenceError) |
557 |
MAKE_EXCEPTION_CTOR(SyntaxError) |
558 |
MAKE_EXCEPTION_CTOR(TypeError) |
559 |
MAKE_EXCEPTION_CTOR(URIError) |
560 |
|
561 |
#undef MAKE_EXCEPTION_CTOR |
562 |
|
563 |
static struct JSExnSpec exceptions[] = { |
564 |
{JSEXN_NONE, js_Error_str, JSProto_Error, Error}, |
565 |
{JSEXN_ERR, js_InternalError_str, JSProto_InternalError, InternalError}, |
566 |
{JSEXN_ERR, js_EvalError_str, JSProto_EvalError, EvalError}, |
567 |
{JSEXN_ERR, js_RangeError_str, JSProto_RangeError, RangeError}, |
568 |
{JSEXN_ERR, js_ReferenceError_str, JSProto_ReferenceError, ReferenceError}, |
569 |
{JSEXN_ERR, js_SyntaxError_str, JSProto_SyntaxError, SyntaxError}, |
570 |
{JSEXN_ERR, js_TypeError_str, JSProto_TypeError, TypeError}, |
571 |
{JSEXN_ERR, js_URIError_str, JSProto_URIError, URIError}, |
572 |
{0, NULL, JSProto_Null, NULL} |
573 |
}; |
574 |
|
575 |
static JSString * |
576 |
ValueToShortSource(JSContext *cx, jsval v) |
577 |
{ |
578 |
JSString *str; |
579 |
|
580 |
/* Avoid toSource bloat and fallibility for object types. */ |
581 |
if (JSVAL_IS_PRIMITIVE(v)) { |
582 |
str = js_ValueToSource(cx, v); |
583 |
} else if (VALUE_IS_FUNCTION(cx, v)) { |
584 |
/* |
585 |
* XXX Avoid function decompilation bloat for now. |
586 |
*/ |
587 |
str = JS_GetFunctionId(JS_ValueToFunction(cx, v)); |
588 |
if (!str && !(str = js_ValueToSource(cx, v))) { |
589 |
/* |
590 |
* Continue to soldier on if the function couldn't be |
591 |
* converted into a string. |
592 |
*/ |
593 |
JS_ClearPendingException(cx); |
594 |
str = JS_NewStringCopyZ(cx, "[unknown function]"); |
595 |
} |
596 |
} else { |
597 |
/* |
598 |
* XXX Avoid toString on objects, it takes too long and uses too much |
599 |
* memory, for too many classes (see Mozilla bug 166743). |
600 |
*/ |
601 |
char buf[100]; |
602 |
JS_snprintf(buf, sizeof buf, "[object %s]", |
603 |
OBJ_GET_CLASS(cx, JSVAL_TO_OBJECT(v))->name); |
604 |
str = JS_NewStringCopyZ(cx, buf); |
605 |
} |
606 |
return str; |
607 |
} |
608 |
|
609 |
static JSString * |
610 |
StackTraceToString(JSContext *cx, JSExnPrivate *priv) |
611 |
{ |
612 |
jschar *stackbuf; |
613 |
size_t stacklen, stackmax; |
614 |
JSStackTraceElem *elem, *endElem; |
615 |
jsval *values; |
616 |
size_t i; |
617 |
JSString *str; |
618 |
const char *cp; |
619 |
char ulnbuf[11]; |
620 |
|
621 |
/* After this point, failing control flow must goto bad. */ |
622 |
stackbuf = NULL; |
623 |
stacklen = stackmax = 0; |
624 |
|
625 |
/* Limit the stackbuf length to a reasonable value to avoid overflow checks. */ |
626 |
#define STACK_LENGTH_LIMIT JS_BIT(20) |
627 |
|
628 |
#define APPEND_CHAR_TO_STACK(c) \ |
629 |
JS_BEGIN_MACRO \ |
630 |
if (stacklen == stackmax) { \ |
631 |
void *ptr_; \ |
632 |
if (stackmax >= STACK_LENGTH_LIMIT) \ |
633 |
goto done; \ |
634 |
stackmax = stackmax ? 2 * stackmax : 64; \ |
635 |
ptr_ = JS_realloc(cx, stackbuf, (stackmax+1) * sizeof(jschar)); \ |
636 |
if (!ptr_) \ |
637 |
goto bad; \ |
638 |
stackbuf = (jschar *) ptr_; \ |
639 |
} \ |
640 |
stackbuf[stacklen++] = (c); \ |
641 |
JS_END_MACRO |
642 |
|
643 |
#define APPEND_STRING_TO_STACK(str) \ |
644 |
JS_BEGIN_MACRO \ |
645 |
JSString *str_ = str; \ |
646 |
jschar *chars_; \ |
647 |
size_t length_; \ |
648 |
\ |
649 |
JSSTRING_CHARS_AND_LENGTH(str_, chars_, length_); \ |
650 |
if (length_ > stackmax - stacklen) { \ |
651 |
void *ptr_; \ |
652 |
if (stackmax >= STACK_LENGTH_LIMIT || \ |
653 |
length_ >= STACK_LENGTH_LIMIT - stacklen) { \ |
654 |
goto done; \ |
655 |
} \ |
656 |
stackmax = JS_BIT(JS_CeilingLog2(stacklen + length_)); \ |
657 |
ptr_ = JS_realloc(cx, stackbuf, (stackmax+1) * sizeof(jschar)); \ |
658 |
if (!ptr_) \ |
659 |
goto bad; \ |
660 |
stackbuf = (jschar *) ptr_; \ |
661 |
} \ |
662 |
js_strncpy(stackbuf + stacklen, chars_, length_); \ |
663 |
stacklen += length_; \ |
664 |
JS_END_MACRO |
665 |
|
666 |
values = GetStackTraceValueBuffer(priv); |
667 |
elem = priv->stackElems; |
668 |
for (endElem = elem + priv->stackDepth; elem != endElem; elem++) { |
669 |
if (elem->funName) { |
670 |
APPEND_STRING_TO_STACK(elem->funName); |
671 |
APPEND_CHAR_TO_STACK('('); |
672 |
for (i = 0; i != elem->argc; i++, values++) { |
673 |
if (i > 0) |
674 |
APPEND_CHAR_TO_STACK(','); |
675 |
str = ValueToShortSource(cx, *values); |
676 |
if (!str) |
677 |
goto bad; |
678 |
APPEND_STRING_TO_STACK(str); |
679 |
} |
680 |
APPEND_CHAR_TO_STACK(')'); |
681 |
} |
682 |
APPEND_CHAR_TO_STACK('@'); |
683 |
if (elem->filename) { |
684 |
for (cp = elem->filename; *cp; cp++) |
685 |
APPEND_CHAR_TO_STACK(*cp); |
686 |
} |
687 |
APPEND_CHAR_TO_STACK(':'); |
688 |
JS_snprintf(ulnbuf, sizeof ulnbuf, "%u", elem->ulineno); |
689 |
for (cp = ulnbuf; *cp; cp++) |
690 |
APPEND_CHAR_TO_STACK(*cp); |
691 |
APPEND_CHAR_TO_STACK('\n'); |
692 |
} |
693 |
#undef APPEND_CHAR_TO_STACK |
694 |
#undef APPEND_STRING_TO_STACK |
695 |
#undef STACK_LENGTH_LIMIT |
696 |
|
697 |
done: |
698 |
if (stacklen == 0) { |
699 |
JS_ASSERT(!stackbuf); |
700 |
return cx->runtime->emptyString; |
701 |
} |
702 |
if (stacklen < stackmax) { |
703 |
/* |
704 |
* Realloc can fail when shrinking on some FreeBSD versions, so |
705 |
* don't use JS_realloc here; simply let the oversized allocation |
706 |
* be owned by the string in that rare case. |
707 |
*/ |
708 |
void *shrunk = JS_realloc(cx, stackbuf, (stacklen+1) * sizeof(jschar)); |
709 |
if (shrunk) |
710 |
stackbuf = (jschar *) shrunk; |
711 |
} |
712 |
|
713 |
stackbuf[stacklen] = 0; |
714 |
str = js_NewString(cx, stackbuf, stacklen); |
715 |
if (str) |
716 |
return str; |
717 |
|
718 |
bad: |
719 |
if (stackbuf) |
720 |
JS_free(cx, stackbuf); |
721 |
return NULL; |
722 |
} |
723 |
|
724 |
/* XXXbe Consolidate the ugly truth that we don't treat filename as UTF-8 |
725 |
with these two functions. */ |
726 |
static JSString * |
727 |
FilenameToString(JSContext *cx, const char *filename) |
728 |
{ |
729 |
return JS_NewStringCopyZ(cx, filename); |
730 |
} |
731 |
|
732 |
static const char * |
733 |
StringToFilename(JSContext *cx, JSString *str) |
734 |
{ |
735 |
return js_GetStringBytes(cx, str); |
736 |
} |
737 |
|
738 |
static JSBool |
739 |
Exception(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) |
740 |
{ |
741 |
uint32 lineno; |
742 |
JSString *message, *filename; |
743 |
JSStackFrame *fp; |
744 |
|
745 |
if (!(cx->fp->flags & JSFRAME_CONSTRUCTING)) { |
746 |
/* |
747 |
* ECMA ed. 3, 15.11.1 requires Error, etc., to construct even when |
748 |
* called as functions, without operator new. But as we do not give |
749 |
* each constructor a distinct JSClass, whose .name member is used by |
750 |
* js_NewObject to find the class prototype, we must get the class |
751 |
* prototype ourselves. |
752 |
*/ |
753 |
if (!OBJ_GET_PROPERTY(cx, JSVAL_TO_OBJECT(argv[-2]), |
754 |
ATOM_TO_JSID(cx->runtime->atomState |
755 |
.classPrototypeAtom), |
756 |
rval)) |
757 |
return JS_FALSE; |
758 |
obj = js_NewObject(cx, &js_ErrorClass, JSVAL_TO_OBJECT(*rval), NULL, 0); |
759 |
if (!obj) |
760 |
return JS_FALSE; |
761 |
*rval = OBJECT_TO_JSVAL(obj); |
762 |
} |
763 |
|
764 |
/* |
765 |
* If it's a new object of class Exception, then null out the private |
766 |
* data so that the finalizer doesn't attempt to free it. |
767 |
*/ |
768 |
if (OBJ_GET_CLASS(cx, obj) == &js_ErrorClass) |
769 |
STOBJ_SET_SLOT(obj, JSSLOT_PRIVATE, JSVAL_VOID); |
770 |
|
771 |
/* Set the 'message' property. */ |
772 |
if (argc != 0) { |
773 |
message = js_ValueToString(cx, argv[0]); |
774 |
if (!message) |
775 |
return JS_FALSE; |
776 |
argv[0] = STRING_TO_JSVAL(message); |
777 |
} else { |
778 |
message = cx->runtime->emptyString; |
779 |
} |
780 |
|
781 |
/* Set the 'fileName' property. */ |
782 |
if (argc > 1) { |
783 |
filename = js_ValueToString(cx, argv[1]); |
784 |
if (!filename) |
785 |
return JS_FALSE; |
786 |
argv[1] = STRING_TO_JSVAL(filename); |
787 |
fp = NULL; |
788 |
} else { |
789 |
fp = JS_GetScriptedCaller(cx, NULL); |
790 |
if (fp) { |
791 |
filename = FilenameToString(cx, fp->script->filename); |
792 |
if (!filename) |
793 |
return JS_FALSE; |
794 |
} else { |
795 |
filename = cx->runtime->emptyString; |
796 |
} |
797 |
} |
798 |
|
799 |
/* Set the 'lineNumber' property. */ |
800 |
if (argc > 2) { |
801 |
lineno = js_ValueToECMAUint32(cx, &argv[2]); |
802 |
if (JSVAL_IS_NULL(argv[2])) |
803 |
return JS_FALSE; |
804 |
} else { |
805 |
if (!fp) |
806 |
fp = JS_GetScriptedCaller(cx, NULL); |
807 |
lineno = (fp && fp->regs) |
808 |
? js_PCToLineNumber(cx, fp->script, fp->regs->pc) |
809 |
: 0; |
810 |
} |
811 |
|
812 |
return (OBJ_GET_CLASS(cx, obj) != &js_ErrorClass) || |
813 |
InitExnPrivate(cx, obj, message, filename, lineno, NULL); |
814 |
} |
815 |
|
816 |
/* |
817 |
* Convert to string. |
818 |
* |
819 |
* This method only uses JavaScript-modifiable properties name, message. It |
820 |
* is left to the host to check for private data and report filename and line |
821 |
* number information along with this message. |
822 |
*/ |
823 |
static JSBool |
824 |
exn_toString(JSContext *cx, uintN argc, jsval *vp) |
825 |
{ |
826 |
JSObject *obj; |
827 |
jsval v; |
828 |
JSString *name, *message, *result; |
829 |
jschar *chars, *cp; |
830 |
size_t name_length, message_length, length; |
831 |
|
832 |
obj = JS_THIS_OBJECT(cx, vp); |
833 |
if (!obj || |
834 |
!OBJ_GET_PROPERTY(cx, obj, |
835 |
ATOM_TO_JSID(cx->runtime->atomState.nameAtom), |
836 |
&v)) { |
837 |
return JS_FALSE; |
838 |
} |
839 |
name = JSVAL_IS_STRING(v) ? JSVAL_TO_STRING(v) : cx->runtime->emptyString; |
840 |
*vp = STRING_TO_JSVAL(name); |
841 |
|
842 |
if (!JS_GetProperty(cx, obj, js_message_str, &v)) |
843 |
return JS_FALSE; |
844 |
message = JSVAL_IS_STRING(v) ? JSVAL_TO_STRING(v) |
845 |
: cx->runtime->emptyString; |
846 |
|
847 |
if (JSSTRING_LENGTH(message) != 0) { |
848 |
name_length = JSSTRING_LENGTH(name); |
849 |
message_length = JSSTRING_LENGTH(message); |
850 |
length = (name_length ? name_length + 2 : 0) + message_length; |
851 |
cp = chars = (jschar *) JS_malloc(cx, (length + 1) * sizeof(jschar)); |
852 |
if (!chars) |
853 |
return JS_FALSE; |
854 |
|
855 |
if (name_length) { |
856 |
js_strncpy(cp, JSSTRING_CHARS(name), name_length); |
857 |
cp += name_length; |
858 |
*cp++ = ':'; *cp++ = ' '; |
859 |
} |
860 |
js_strncpy(cp, JSSTRING_CHARS(message), message_length); |
861 |
cp += message_length; |
862 |
*cp = 0; |
863 |
|
864 |
result = js_NewString(cx, chars, length); |
865 |
if (!result) { |
866 |
JS_free(cx, chars); |
867 |
return JS_FALSE; |
868 |
} |
869 |
} else { |
870 |
result = name; |
871 |
} |
872 |
|
873 |
*vp = STRING_TO_JSVAL(result); |
874 |
return JS_TRUE; |
875 |
} |
876 |
|
877 |
#if JS_HAS_TOSOURCE |
878 |
/* |
879 |
* Return a string that may eval to something similar to the original object. |
880 |
*/ |
881 |
static JSBool |
882 |
exn_toSource(JSContext *cx, uintN argc, jsval *vp) |
883 |
{ |
884 |
JSObject *obj; |
885 |
JSString *name, *message, *filename, *lineno_as_str, *result; |
886 |
jsval localroots[3] = {JSVAL_NULL, JSVAL_NULL, JSVAL_NULL}; |
887 |
JSTempValueRooter tvr; |
888 |
JSBool ok; |
889 |
uint32 lineno; |
890 |
size_t lineno_length, name_length, message_length, filename_length, length; |
891 |
jschar *chars, *cp; |
892 |
|
893 |
obj = JS_THIS_OBJECT(cx, vp); |
894 |
if (!obj || |
895 |
!OBJ_GET_PROPERTY(cx, obj, |
896 |
ATOM_TO_JSID(cx->runtime->atomState.nameAtom), |
897 |
vp)) { |
898 |
return JS_FALSE; |
899 |
} |
900 |
name = js_ValueToString(cx, *vp); |
901 |
if (!name) |
902 |
return JS_FALSE; |
903 |
*vp = STRING_TO_JSVAL(name); |
904 |
|
905 |
MUST_FLOW_THROUGH("out"); |
906 |
JS_PUSH_TEMP_ROOT(cx, 3, localroots, &tvr); |
907 |
|
908 |
#ifdef __GNUC__ |
909 |
message = filename = NULL; |
910 |
#endif |
911 |
ok = JS_GetProperty(cx, obj, js_message_str, &localroots[0]) && |
912 |
(message = js_ValueToSource(cx, localroots[0])); |
913 |
if (!ok) |
914 |
goto out; |
915 |
localroots[0] = STRING_TO_JSVAL(message); |
916 |
|
917 |
ok = JS_GetProperty(cx, obj, js_fileName_str, &localroots[1]) && |
918 |
(filename = js_ValueToSource(cx, localroots[1])); |
919 |
if (!ok) |
920 |
goto out; |
921 |
localroots[1] = STRING_TO_JSVAL(filename); |
922 |
|
923 |
ok = JS_GetProperty(cx, obj, js_lineNumber_str, &localroots[2]); |
924 |
if (!ok) |
925 |
goto out; |
926 |
lineno = js_ValueToECMAUint32 (cx, &localroots[2]); |
927 |
ok = !JSVAL_IS_NULL(localroots[2]); |
928 |
if (!ok) |
929 |
goto out; |
930 |
|
931 |
if (lineno != 0) { |
932 |
lineno_as_str = js_ValueToString(cx, localroots[2]); |
933 |
if (!lineno_as_str) { |
934 |
ok = JS_FALSE; |
935 |
goto out; |
936 |
} |
937 |
lineno_length = JSSTRING_LENGTH(lineno_as_str); |
938 |
} else { |
939 |
lineno_as_str = NULL; |
940 |
lineno_length = 0; |
941 |
} |
942 |
|
943 |
/* Magic 8, for the characters in ``(new ())''. */ |
944 |
name_length = JSSTRING_LENGTH(name); |
945 |
message_length = JSSTRING_LENGTH(message); |
946 |
length = 8 + name_length + message_length; |
947 |
|
948 |
filename_length = JSSTRING_LENGTH(filename); |
949 |
if (filename_length != 0) { |
950 |
/* append filename as ``, {filename}'' */ |
951 |
length += 2 + filename_length; |
952 |
if (lineno_as_str) { |
953 |
/* append lineno as ``, {lineno_as_str}'' */ |
954 |
length += 2 + lineno_length; |
955 |
} |
956 |
} else { |
957 |
if (lineno_as_str) { |
958 |
/* |
959 |
* no filename, but have line number, |
960 |
* need to append ``, "", {lineno_as_str}'' |
961 |
*/ |
962 |
length += 6 + lineno_length; |
963 |
} |
964 |
} |
965 |
|
966 |
cp = chars = (jschar *) JS_malloc(cx, (length + 1) * sizeof(jschar)); |
967 |
if (!chars) { |
968 |
ok = JS_FALSE; |
969 |
goto out; |
970 |
} |
971 |
|
972 |
*cp++ = '('; *cp++ = 'n'; *cp++ = 'e'; *cp++ = 'w'; *cp++ = ' '; |
973 |
js_strncpy(cp, JSSTRING_CHARS(name), name_length); |
974 |
cp += name_length; |
975 |
*cp++ = '('; |
976 |
if (message_length != 0) { |
977 |
js_strncpy(cp, JSSTRING_CHARS(message), message_length); |
978 |
cp += message_length; |
979 |
} |
980 |
|
981 |
if (filename_length != 0) { |
982 |
/* append filename as ``, {filename}'' */ |
983 |
*cp++ = ','; *cp++ = ' '; |
984 |
js_strncpy(cp, JSSTRING_CHARS(filename), filename_length); |
985 |
cp += filename_length; |
986 |
} else { |
987 |
if (lineno_as_str) { |
988 |
/* |
989 |
* no filename, but have line number, |
990 |
* need to append ``, "", {lineno_as_str}'' |
991 |
*/ |
992 |
*cp++ = ','; *cp++ = ' '; *cp++ = '"'; *cp++ = '"'; |
993 |
} |
994 |
} |
995 |
if (lineno_as_str) { |
996 |
/* append lineno as ``, {lineno_as_str}'' */ |
997 |
*cp++ = ','; *cp++ = ' '; |
998 |
js_strncpy(cp, JSSTRING_CHARS(lineno_as_str), lineno_length); |
999 |
cp += lineno_length; |
1000 |
} |
1001 |
|
1002 |
*cp++ = ')'; *cp++ = ')'; *cp = 0; |
1003 |
|
1004 |
result = js_NewString(cx, chars, length); |
1005 |
if (!result) { |
1006 |
JS_free(cx, chars); |
1007 |
ok = JS_FALSE; |
1008 |
goto out; |
1009 |
} |
1010 |
*vp = STRING_TO_JSVAL(result); |
1011 |
ok = JS_TRUE; |
1012 |
|
1013 |
out: |
1014 |
JS_POP_TEMP_ROOT(cx, &tvr); |
1015 |
return ok; |
1016 |
} |
1017 |
#endif |
1018 |
|
1019 |
static JSFunctionSpec exception_methods[] = { |
1020 |
#if JS_HAS_TOSOURCE |
1021 |
JS_FN(js_toSource_str, exn_toSource, 0,0), |
1022 |
#endif |
1023 |
JS_FN(js_toString_str, exn_toString, 0,0), |
1024 |
JS_FS_END |
1025 |
}; |
1026 |
|
1027 |
JSObject * |
1028 |
js_InitExceptionClasses(JSContext *cx, JSObject *obj) |
1029 |
{ |
1030 |
JSObject *obj_proto, *protos[JSEXN_LIMIT]; |
1031 |
int i; |
1032 |
|
1033 |
/* |
1034 |
* If lazy class initialization occurs for any Error subclass, then all |
1035 |
* classes are initialized, starting with Error. To avoid reentry and |
1036 |
* redundant initialization, we must not pass a null proto parameter to |
1037 |
* js_NewObject below, when called for the Error superclass. We need to |
1038 |
* ensure that Object.prototype is the proto of Error.prototype. |
1039 |
* |
1040 |
* See the equivalent code to ensure that parent_proto is non-null when |
1041 |
* JS_InitClass calls js_NewObject, in jsapi.c. |
1042 |
*/ |
1043 |
if (!js_GetClassPrototype(cx, obj, INT_TO_JSID(JSProto_Object), |
1044 |
&obj_proto)) { |
1045 |
return NULL; |
1046 |
} |
1047 |
|
1048 |
if (!js_EnterLocalRootScope(cx)) |
1049 |
return NULL; |
1050 |
|
1051 |
/* Initialize the prototypes first. */ |
1052 |
for (i = 0; exceptions[i].name != 0; i++) { |
1053 |
JSAtom *atom; |
1054 |
JSFunction *fun; |
1055 |
JSString *nameString; |
1056 |
int protoIndex = exceptions[i].protoIndex; |
1057 |
|
1058 |
/* Make the prototype for the current constructor name. */ |
1059 |
protos[i] = js_NewObject(cx, &js_ErrorClass, |
1060 |
(protoIndex != JSEXN_NONE) |
1061 |
? protos[protoIndex] |
1062 |
: obj_proto, |
1063 |
obj, 0); |
1064 |
if (!protos[i]) |
1065 |
break; |
1066 |
|
1067 |
/* So exn_finalize knows whether to destroy private data. */ |
1068 |
STOBJ_SET_SLOT(protos[i], JSSLOT_PRIVATE, JSVAL_VOID); |
1069 |
|
1070 |
/* Make a constructor function for the current name. */ |
1071 |
atom = cx->runtime->atomState.classAtoms[exceptions[i].key]; |
1072 |
fun = js_DefineFunction(cx, obj, atom, exceptions[i].native, 3, 0); |
1073 |
if (!fun) |
1074 |
break; |
1075 |
|
1076 |
/* Make this constructor make objects of class Exception. */ |
1077 |
fun->u.n.clasp = &js_ErrorClass; |
1078 |
|
1079 |
/* Make the prototype and constructor links. */ |
1080 |
if (!js_SetClassPrototype(cx, FUN_OBJECT(fun), protos[i], |
1081 |
JSPROP_READONLY | JSPROP_PERMANENT)) { |
1082 |
break; |
1083 |
} |
1084 |
|
1085 |
/* proto bootstrap bit from JS_InitClass omitted. */ |
1086 |
nameString = JS_NewStringCopyZ(cx, exceptions[i].name); |
1087 |
if (!nameString) |
1088 |
break; |
1089 |
|
1090 |
/* Add the name property to the prototype. */ |
1091 |
if (!JS_DefineProperty(cx, protos[i], js_name_str, |
1092 |
STRING_TO_JSVAL(nameString), |
1093 |
NULL, NULL, |
1094 |
JSPROP_ENUMERATE)) { |
1095 |
break; |
1096 |
} |
1097 |
|
1098 |
/* Finally, stash the constructor for later uses. */ |
1099 |
if (!js_SetClassObject(cx, obj, exceptions[i].key, FUN_OBJECT(fun))) |
1100 |
break; |
1101 |
} |
1102 |
|
1103 |
js_LeaveLocalRootScope(cx); |
1104 |
if (exceptions[i].name) |
1105 |
return NULL; |
1106 |
|
1107 |
/* |
1108 |
* Add an empty message property. (To Exception.prototype only, |
1109 |
* because this property will be the same for all the exception |
1110 |
* protos.) |
1111 |
*/ |
1112 |
if (!JS_DefineProperty(cx, protos[0], js_message_str, |
1113 |
STRING_TO_JSVAL(cx->runtime->emptyString), |
1114 |
NULL, NULL, JSPROP_ENUMERATE)) { |
1115 |
return NULL; |
1116 |
} |
1117 |
if (!JS_DefineProperty(cx, protos[0], js_fileName_str, |
1118 |
STRING_TO_JSVAL(cx->runtime->emptyString), |
1119 |
NULL, NULL, JSPROP_ENUMERATE)) { |
1120 |
return NULL; |
1121 |
} |
1122 |
if (!JS_DefineProperty(cx, protos[0], js_lineNumber_str, |
1123 |
INT_TO_JSVAL(0), |
1124 |
NULL, NULL, JSPROP_ENUMERATE)) { |
1125 |
return NULL; |
1126 |
} |
1127 |
|
1128 |
/* |
1129 |
* Add methods only to Exception.prototype, because ostensibly all |
1130 |
* exception types delegate to that. |
1131 |
*/ |
1132 |
if (!JS_DefineFunctions(cx, protos[0], exception_methods)) |
1133 |
return NULL; |
1134 |
|
1135 |
return protos[0]; |
1136 |
} |
1137 |
|
1138 |
const JSErrorFormatString* |
1139 |
js_GetLocalizedErrorMessage(JSContext* cx, void *userRef, const char *locale, |
1140 |
const uintN errorNumber) |
1141 |
{ |
1142 |
const JSErrorFormatString *errorString = NULL; |
1143 |
|
1144 |
if (cx->localeCallbacks && cx->localeCallbacks->localeGetErrorMessage) { |
1145 |
errorString = cx->localeCallbacks |
1146 |
->localeGetErrorMessage(userRef, locale, errorNumber); |
1147 |
} |
1148 |
if (!errorString) |
1149 |
errorString = js_GetErrorMessage(userRef, locale, errorNumber); |
1150 |
return errorString; |
1151 |
} |
1152 |
|
1153 |
#if defined ( DEBUG_mccabe ) && defined ( PRINTNAMES ) |
1154 |
/* For use below... get character strings for error name and exception name */ |
1155 |
static struct exnname { char *name; char *exception; } errortoexnname[] = { |
1156 |
#define MSG_DEF(name, number, count, exception, format) \ |
1157 |
{#name, #exception}, |
1158 |
#include "js.msg" |
1159 |
#undef MSG_DEF |
1160 |
}; |
1161 |
#endif /* DEBUG */ |
1162 |
|
1163 |
JSBool |
1164 |
js_ErrorToException(JSContext *cx, const char *message, JSErrorReport *reportp) |
1165 |
{ |
1166 |
JSErrNum errorNumber; |
1167 |
const JSErrorFormatString *errorString; |
1168 |
JSExnType exn; |
1169 |
jsval tv[4]; |
1170 |
JSTempValueRooter tvr; |
1171 |
JSBool ok; |
1172 |
JSObject *errProto, *errObject; |
1173 |
JSString *messageStr, *filenameStr; |
1174 |
|
1175 |
/* |
1176 |
* Tell our caller to report immediately if this report is just a warning. |
1177 |
*/ |
1178 |
JS_ASSERT(reportp); |
1179 |
if (JSREPORT_IS_WARNING(reportp->flags)) |
1180 |
return JS_FALSE; |
1181 |
|
1182 |
/* Find the exception index associated with this error. */ |
1183 |
errorNumber = (JSErrNum) reportp->errorNumber; |
1184 |
errorString = js_GetLocalizedErrorMessage(cx, NULL, NULL, errorNumber); |
1185 |
exn = errorString ? (JSExnType) errorString->exnType : JSEXN_NONE; |
1186 |
JS_ASSERT(exn < JSEXN_LIMIT); |
1187 |
|
1188 |
#if defined( DEBUG_mccabe ) && defined ( PRINTNAMES ) |
1189 |
/* Print the error name and the associated exception name to stderr */ |
1190 |
fprintf(stderr, "%s\t%s\n", |
1191 |
errortoexnname[errorNumber].name, |
1192 |
errortoexnname[errorNumber].exception); |
1193 |
#endif |
1194 |
|
1195 |
/* |
1196 |
* Return false (no exception raised) if no exception is associated |
1197 |
* with the given error number. |
1198 |
*/ |
1199 |
if (exn == JSEXN_NONE) |
1200 |
return JS_FALSE; |
1201 |
|
1202 |
/* |
1203 |
* Prevent runaway recursion, via cx->generatingError. If an out-of-memory |
1204 |
* error occurs, no exception object will be created, but we don't assume |
1205 |
* that OOM is the only kind of error that subroutines of this function |
1206 |
* called below might raise. |
1207 |
*/ |
1208 |
if (cx->generatingError) |
1209 |
return JS_FALSE; |
1210 |
|
1211 |
MUST_FLOW_THROUGH("out"); |
1212 |
cx->generatingError = JS_TRUE; |
1213 |
|
1214 |
/* Protect the newly-created strings below from nesting GCs. */ |
1215 |
memset(tv, 0, sizeof tv); |
1216 |
JS_PUSH_TEMP_ROOT(cx, JS_ARRAY_LENGTH(tv), tv, &tvr); |
1217 |
|
1218 |
/* |
1219 |
* Try to get an appropriate prototype by looking up the corresponding |
1220 |
* exception constructor name in the scope chain of the current context's |
1221 |
* top stack frame, or in the global object if no frame is active. |
1222 |
*/ |
1223 |
ok = js_GetClassPrototype(cx, NULL, INT_TO_JSID(exceptions[exn].key), |
1224 |
&errProto); |
1225 |
if (!ok) |
1226 |
goto out; |
1227 |
tv[0] = OBJECT_TO_JSVAL(errProto); |
1228 |
|
1229 |
errObject = js_NewObject(cx, &js_ErrorClass, errProto, NULL, 0); |
1230 |
if (!errObject) { |
1231 |
ok = JS_FALSE; |
1232 |
goto out; |
1233 |
} |
1234 |
tv[1] = OBJECT_TO_JSVAL(errObject); |
1235 |
|
1236 |
messageStr = JS_NewStringCopyZ(cx, message); |
1237 |
if (!messageStr) { |
1238 |
ok = JS_FALSE; |
1239 |
goto out; |
1240 |
} |
1241 |
tv[2] = STRING_TO_JSVAL(messageStr); |
1242 |
|
1243 |
filenameStr = JS_NewStringCopyZ(cx, reportp->filename); |
1244 |
if (!filenameStr) { |
1245 |
ok = JS_FALSE; |
1246 |
goto out; |
1247 |
} |
1248 |
tv[3] = STRING_TO_JSVAL(filenameStr); |
1249 |
|
1250 |
ok = InitExnPrivate(cx, errObject, messageStr, filenameStr, |
1251 |
reportp->lineno, reportp); |
1252 |
if (!ok) |
1253 |
goto out; |
1254 |
|
1255 |
JS_SetPendingException(cx, OBJECT_TO_JSVAL(errObject)); |
1256 |
|
1257 |
/* Flag the error report passed in to indicate an exception was raised. */ |
1258 |
reportp->flags |= JSREPORT_EXCEPTION; |
1259 |
|
1260 |
out: |
1261 |
JS_POP_TEMP_ROOT(cx, &tvr); |
1262 |
cx->generatingError = JS_FALSE; |
1263 |
return ok; |
1264 |
} |
1265 |
|
1266 |
JSBool |
1267 |
js_ReportUncaughtException(JSContext *cx) |
1268 |
{ |
1269 |
jsval exn; |
1270 |
JSObject *exnObject; |
1271 |
jsval roots[5]; |
1272 |
JSTempValueRooter tvr; |
1273 |
JSErrorReport *reportp, report; |
1274 |
JSString *str; |
1275 |
const char *bytes; |
1276 |
JSBool ok; |
1277 |
|
1278 |
if (!JS_IsExceptionPending(cx)) |
1279 |
return JS_TRUE; |
1280 |
|
1281 |
if (!JS_GetPendingException(cx, &exn)) |
1282 |
return JS_FALSE; |
1283 |
|
1284 |
memset(roots, 0, sizeof roots); |
1285 |
JS_PUSH_TEMP_ROOT(cx, JS_ARRAY_LENGTH(roots), roots, &tvr); |
1286 |
|
1287 |
/* |
1288 |
* Because js_ValueToString below could error and an exception object |
1289 |
* could become unrooted, we must root exnObject. Later, if exnObject is |
1290 |
* non-null, we need to root other intermediates, so allocate an operand |
1291 |
* stack segment to protect all of these values. |
1292 |
*/ |
1293 |
if (JSVAL_IS_PRIMITIVE(exn)) { |
1294 |
exnObject = NULL; |
1295 |
} else { |
1296 |
exnObject = JSVAL_TO_OBJECT(exn); |
1297 |
roots[0] = exn; |
1298 |
} |
1299 |
|
1300 |
JS_ClearPendingException(cx); |
1301 |
reportp = js_ErrorFromException(cx, exn); |
1302 |
|
1303 |
/* XXX L10N angels cry once again (see also jsemit.c, /L10N gaffes/) */ |
1304 |
str = js_ValueToString(cx, exn); |
1305 |
if (!str) { |
1306 |
bytes = "unknown (can't convert to string)"; |
1307 |
} else { |
1308 |
roots[1] = STRING_TO_JSVAL(str); |
1309 |
bytes = js_GetStringBytes(cx, str); |
1310 |
if (!bytes) { |
1311 |
ok = JS_FALSE; |
1312 |
goto out; |
1313 |
} |
1314 |
} |
1315 |
ok = JS_TRUE; |
1316 |
|
1317 |
if (!reportp && |
1318 |
exnObject && |
1319 |
OBJ_GET_CLASS(cx, exnObject) == &js_ErrorClass) { |
1320 |
const char *filename; |
1321 |
uint32 lineno; |
1322 |
|
1323 |
ok = JS_GetProperty(cx, exnObject, js_message_str, &roots[2]); |
1324 |
if (!ok) |
1325 |
goto out; |
1326 |
if (JSVAL_IS_STRING(roots[2])) { |
1327 |
bytes = js_GetStringBytes(cx, JSVAL_TO_STRING(roots[2])); |
1328 |
if (!bytes) { |
1329 |
ok = JS_FALSE; |
1330 |
goto out; |
1331 |
} |
1332 |
} |
1333 |
|
1334 |
ok = JS_GetProperty(cx, exnObject, js_fileName_str, &roots[3]); |
1335 |
if (!ok) |
1336 |
goto out; |
1337 |
str = js_ValueToString(cx, roots[3]); |
1338 |
if (!str) { |
1339 |
ok = JS_FALSE; |
1340 |
goto out; |
1341 |
} |
1342 |
filename = StringToFilename(cx, str); |
1343 |
if (!filename) { |
1344 |
ok = JS_FALSE; |
1345 |
goto out; |
1346 |
} |
1347 |
|
1348 |
ok = JS_GetProperty(cx, exnObject, js_lineNumber_str, &roots[4]); |
1349 |
if (!ok) |
1350 |
goto out; |
1351 |
lineno = js_ValueToECMAUint32 (cx, &roots[4]); |
1352 |
ok = !JSVAL_IS_NULL(roots[4]); |
1353 |
if (!ok) |
1354 |
goto out; |
1355 |
|
1356 |
reportp = &report; |
1357 |
memset(&report, 0, sizeof report); |
1358 |
report.filename = filename; |
1359 |
report.lineno = (uintN) lineno; |
1360 |
} |
1361 |
|
1362 |
if (!reportp) { |
1363 |
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, |
1364 |
JSMSG_UNCAUGHT_EXCEPTION, bytes); |
1365 |
} else { |
1366 |
/* Flag the error as an exception. */ |
1367 |
reportp->flags |= JSREPORT_EXCEPTION; |
1368 |
|
1369 |
/* Pass the exception object. */ |
1370 |
JS_SetPendingException(cx, exn); |
1371 |
js_ReportErrorAgain(cx, bytes, reportp); |
1372 |
JS_ClearPendingException(cx); |
1373 |
} |
1374 |
|
1375 |
out: |
1376 |
JS_POP_TEMP_ROOT(cx, &tvr); |
1377 |
return ok; |
1378 |
} |