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gecko-dev/js/src/jsexn.c

1162 строки
38 KiB
C
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sw=4 et tw=80:
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* JS standard exception implementation.
*/
#include "jsstddef.h"
#include <stdlib.h>
#include <string.h>
#include "jstypes.h"
#include "jsbit.h"
#include "jsutil.h" /* Added by JSIFY */
#include "jsprf.h"
#include "jsapi.h"
#include "jscntxt.h"
#include "jsconfig.h"
#include "jsdbgapi.h"
#include "jsexn.h"
#include "jsfun.h"
#include "jsinterp.h"
#include "jsnum.h"
#include "jsopcode.h"
#include "jsscript.h"
/* XXX consider adding rt->atomState.messageAtom */
static char js_message_str[] = "message";
static char js_filename_str[] = "fileName";
static char js_lineno_str[] = "lineNumber";
static char js_stack_str[] = "stack";
/* Forward declarations for ExceptionClass's initializer. */
static JSBool
Exception(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval);
static void
exn_finalize(JSContext *cx, JSObject *obj);
static JSClass ExceptionClass = {
js_Error_str,
JSCLASS_HAS_PRIVATE | JSCLASS_HAS_CACHED_PROTO(JSProto_Error),
JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, exn_finalize,
NULL, NULL, NULL, Exception,
NULL, NULL, NULL, 0
};
/*
* A copy of the JSErrorReport originally generated.
*/
typedef struct JSExnPrivate {
JSErrorReport *errorReport;
} JSExnPrivate;
/*
* Undo all the damage done by exn_newPrivate.
*/
static void
exn_destroyPrivate(JSContext *cx, JSExnPrivate *privateData)
{
JSErrorReport *report;
const jschar **args;
if (!privateData)
return;
report = privateData->errorReport;
if (report) {
if (report->uclinebuf)
JS_free(cx, (void *)report->uclinebuf);
if (report->filename)
JS_free(cx, (void *)report->filename);
if (report->ucmessage)
JS_free(cx, (void *)report->ucmessage);
if (report->messageArgs) {
args = report->messageArgs;
while (*args)
JS_free(cx, (void *)*args++);
JS_free(cx, (void *)report->messageArgs);
}
JS_free(cx, report);
}
JS_free(cx, privateData);
}
/*
* Copy everything interesting about an error into allocated memory.
*/
static JSExnPrivate *
exn_newPrivate(JSContext *cx, JSErrorReport *report)
{
intN i;
JSExnPrivate *newPrivate;
JSErrorReport *newReport;
size_t capacity;
newPrivate = (JSExnPrivate *)JS_malloc(cx, sizeof (JSExnPrivate));
if (!newPrivate)
return NULL;
memset(newPrivate, 0, sizeof (JSExnPrivate));
/* Copy the error report */
newReport = (JSErrorReport *)JS_malloc(cx, sizeof (JSErrorReport));
if (!newReport)
goto error;
memset(newReport, 0, sizeof (JSErrorReport));
newPrivate->errorReport = newReport;
if (report->filename) {
newReport->filename = JS_strdup(cx, report->filename);
if (!newReport->filename)
goto error;
} else {
newReport->filename = NULL;
}
newReport->lineno = report->lineno;
/*
* We don't need to copy linebuf and tokenptr, because they
* point into the deflated string cache. (currently?)
*/
newReport->linebuf = report->linebuf;
newReport->tokenptr = report->tokenptr;
/*
* But we do need to copy uclinebuf, uctokenptr, because they're
* pointers into internal tokenstream structs, and may go away.
*/
if (report->uclinebuf) {
capacity = js_strlen(report->uclinebuf) + 1;
newReport->uclinebuf =
(const jschar *)JS_malloc(cx, capacity * sizeof(jschar));
if (!newReport->uclinebuf)
goto error;
js_strncpy((jschar *)newReport->uclinebuf, report->uclinebuf, capacity);
newReport->uctokenptr = newReport->uclinebuf + (report->uctokenptr -
report->uclinebuf);
} else {
newReport->uclinebuf = newReport->uctokenptr = NULL;
}
if (report->ucmessage) {
capacity = js_strlen(report->ucmessage) + 1;
newReport->ucmessage = (const jschar *)
JS_malloc(cx, capacity * sizeof(jschar));
if (!newReport->ucmessage)
goto error;
js_strncpy((jschar *)newReport->ucmessage, report->ucmessage, capacity);
if (report->messageArgs) {
for (i = 0; report->messageArgs[i]; i++)
continue;
JS_ASSERT(i);
newReport->messageArgs =
(const jschar **)JS_malloc(cx, (i + 1) * sizeof(jschar *));
if (!newReport->messageArgs)
goto error;
for (i = 0; report->messageArgs[i]; i++) {
capacity = js_strlen(report->messageArgs[i]) + 1;
newReport->messageArgs[i] =
(const jschar *)JS_malloc(cx, capacity * sizeof(jschar));
if (!newReport->messageArgs[i])
goto error;
js_strncpy((jschar *)(newReport->messageArgs[i]),
report->messageArgs[i], capacity);
}
newReport->messageArgs[i] = NULL;
} else {
newReport->messageArgs = NULL;
}
} else {
newReport->ucmessage = NULL;
newReport->messageArgs = NULL;
}
newReport->errorNumber = report->errorNumber;
/* Note that this is before it gets flagged with JSREPORT_EXCEPTION */
newReport->flags = report->flags;
return newPrivate;
error:
exn_destroyPrivate(cx, newPrivate);
return NULL;
}
static void
exn_finalize(JSContext *cx, JSObject *obj)
{
JSExnPrivate *privateData;
jsval privateValue;
privateValue = OBJ_GET_SLOT(cx, obj, JSSLOT_PRIVATE);
if (!JSVAL_IS_VOID(privateValue)) {
privateData = (JSExnPrivate*) JSVAL_TO_PRIVATE(privateValue);
if (privateData)
exn_destroyPrivate(cx, privateData);
}
}
JSErrorReport *
js_ErrorFromException(JSContext *cx, jsval exn)
{
JSObject *obj;
JSExnPrivate *privateData;
jsval privateValue;
if (JSVAL_IS_PRIMITIVE(exn))
return NULL;
obj = JSVAL_TO_OBJECT(exn);
if (OBJ_GET_CLASS(cx, obj) != &ExceptionClass)
return NULL;
privateValue = OBJ_GET_SLOT(cx, obj, JSSLOT_PRIVATE);
if (JSVAL_IS_VOID(privateValue))
return NULL;
privateData = (JSExnPrivate*) JSVAL_TO_PRIVATE(privateValue);
if (!privateData)
return NULL;
JS_ASSERT(privateData->errorReport);
return privateData->errorReport;
}
struct JSExnSpec {
int protoIndex;
const char *name;
JSProtoKey key;
JSNative native;
};
/*
* All *Error constructors share the same JSClass, ExceptionClass. But each
* constructor function for an *Error class must have a distinct native 'call'
* function pointer, in order for instanceof to work properly across multiple
* standard class sets. See jsfun.c:fun_hasInstance.
*/
#define MAKE_EXCEPTION_CTOR(name) \
static JSBool \
name(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) \
{ \
return Exception(cx, obj, argc, argv, rval); \
}
MAKE_EXCEPTION_CTOR(Error)
MAKE_EXCEPTION_CTOR(InternalError)
MAKE_EXCEPTION_CTOR(EvalError)
MAKE_EXCEPTION_CTOR(RangeError)
MAKE_EXCEPTION_CTOR(ReferenceError)
MAKE_EXCEPTION_CTOR(SyntaxError)
MAKE_EXCEPTION_CTOR(TypeError)
MAKE_EXCEPTION_CTOR(URIError)
#undef MAKE_EXCEPTION_CTOR
static struct JSExnSpec exceptions[] = {
{JSEXN_NONE, js_Error_str, JSProto_Error, Error},
{JSEXN_ERR, js_InternalError_str, JSProto_InternalError, InternalError},
{JSEXN_ERR, js_EvalError_str, JSProto_EvalError, EvalError},
{JSEXN_ERR, js_RangeError_str, JSProto_RangeError, RangeError},
{JSEXN_ERR, js_ReferenceError_str, JSProto_ReferenceError, ReferenceError},
{JSEXN_ERR, js_SyntaxError_str, JSProto_SyntaxError, SyntaxError},
{JSEXN_ERR, js_TypeError_str, JSProto_TypeError, TypeError},
{JSEXN_ERR, js_URIError_str, JSProto_URIError, URIError},
{0, NULL, JSProto_Null, NULL}
};
static JSBool
InitExceptionObject(JSContext *cx, JSObject *obj, JSString *message,
JSString *filename, uintN lineno)
{
JSCheckAccessOp checkAccess;
JSErrorReporter older;
JSExceptionState *state;
jschar *stackbuf;
size_t stacklen, stackmax;
JSStackFrame *fp;
jsval callerid, v;
JSBool ok;
JSString *argsrc, *stack;
uintN i, ulineno;
const char *cp;
char ulnbuf[11];
if (!JS_DefineProperty(cx, obj, js_message_str, STRING_TO_JSVAL(message),
NULL, NULL, JSPROP_ENUMERATE)) {
return JS_FALSE;
}
if (!JS_DefineProperty(cx, obj, js_filename_str,
STRING_TO_JSVAL(filename),
NULL, NULL, JSPROP_ENUMERATE)) {
return JS_FALSE;
}
if (!JS_DefineProperty(cx, obj, js_lineno_str,
INT_TO_JSVAL(lineno),
NULL, NULL, JSPROP_ENUMERATE)) {
return JS_FALSE;
}
/*
* Set the 'stack' property.
*
* First, set aside any error reporter for cx and save its exception state
* so we can suppress any checkAccess failures. Such failures should stop
* the backtrace procedure, not result in a failure of this constructor.
*/
checkAccess = cx->runtime->checkObjectAccess;
older = JS_SetErrorReporter(cx, NULL);
state = JS_SaveExceptionState(cx);
callerid = ATOM_KEY(cx->runtime->atomState.callerAtom);
/*
* Prepare to allocate a jschar buffer at stackbuf, where stacklen indexes
* the next free jschar slot, and with room for at most stackmax non-null
* jschars. If stackbuf is non-null, it always contains an extra slot for
* the null terminator we'll store at the end, as a backstop.
*
* All early returns must goto done after this point, till the after-loop
* cleanup code has run!
*/
stackbuf = NULL;
stacklen = stackmax = 0;
ok = JS_TRUE;
#define APPEND_CHAR_TO_STACK(c) \
JS_BEGIN_MACRO \
if (stacklen == stackmax) { \
void *ptr_; \
stackmax = stackmax ? 2 * stackmax : 64; \
ptr_ = JS_realloc(cx, stackbuf, (stackmax+1) * sizeof(jschar)); \
if (!ptr_) { \
ok = JS_FALSE; \
goto done; \
} \
stackbuf = ptr_; \
} \
stackbuf[stacklen++] = (c); \
JS_END_MACRO
#define APPEND_STRING_TO_STACK(str) \
JS_BEGIN_MACRO \
JSString *str_ = str; \
size_t length_ = JSSTRING_LENGTH(str_); \
if (stacklen + length_ > stackmax) { \
void *ptr_; \
stackmax = JS_BIT(JS_CeilingLog2(stacklen + length_)); \
ptr_ = JS_realloc(cx, stackbuf, (stackmax+1) * sizeof(jschar)); \
if (!ptr_) { \
ok = JS_FALSE; \
goto done; \
} \
stackbuf = ptr_; \
} \
js_strncpy(stackbuf + stacklen, JSSTRING_CHARS(str_), length_); \
stacklen += length_; \
JS_END_MACRO
for (fp = cx->fp; fp; fp = fp->down) {
if (checkAccess) {
v = (fp->fun && fp->argv) ? fp->argv[-2] : JSVAL_NULL;
if (!JSVAL_IS_PRIMITIVE(v)) {
ok = checkAccess(cx, JSVAL_TO_OBJECT(fp->argv[-2]), callerid,
JSACC_READ, &v /* ignored */);
if (!ok) {
ok = JS_TRUE;
break;
}
}
}
if (fp->fun) {
if (fp->fun->atom)
APPEND_STRING_TO_STACK(ATOM_TO_STRING(fp->fun->atom));
APPEND_CHAR_TO_STACK('(');
for (i = 0; i < fp->argc; i++) {
/* Avoid toSource bloat and fallibility for object types. */
v = fp->argv[i];
if (JSVAL_IS_PRIMITIVE(v)) {
argsrc = js_ValueToSource(cx, v);
} else if (VALUE_IS_FUNCTION(cx, v)) {
/* XXX Avoid function decompilation bloat for now. */
argsrc = JS_GetFunctionId(JS_ValueToFunction(cx, v));
if (!argsrc && !(argsrc = js_ValueToSource(cx, v))) {
/*
* Continue to soldier on if the function couldn't be
* converted into a string.
*/
JS_ClearPendingException(cx);
argsrc = JS_NewStringCopyZ(cx, "[unknown function]");
if (!argsrc) {
ok = JS_FALSE;
break;
}
}
} else {
/* XXX Avoid toString on objects, it takes too long and
uses too much memory, for too many classes (see
Mozilla bug 166743). */
char buf[100];
JS_snprintf(buf, sizeof buf, "[object %s]",
OBJ_GET_CLASS(cx, JSVAL_TO_OBJECT(v))->name);
argsrc = JS_NewStringCopyZ(cx, buf);
}
if (!argsrc) {
ok = JS_FALSE;
goto done;
}
if (i > 0)
APPEND_CHAR_TO_STACK(',');
APPEND_STRING_TO_STACK(argsrc);
}
APPEND_CHAR_TO_STACK(')');
}
APPEND_CHAR_TO_STACK('@');
if (fp->script && fp->script->filename) {
for (cp = fp->script->filename; *cp; cp++)
APPEND_CHAR_TO_STACK(*cp);
}
APPEND_CHAR_TO_STACK(':');
if (fp->script && fp->pc) {
ulineno = js_PCToLineNumber(cx, fp->script, fp->pc);
JS_snprintf(ulnbuf, sizeof ulnbuf, "%u", ulineno);
for (cp = ulnbuf; *cp; cp++)
APPEND_CHAR_TO_STACK(*cp);
} else {
APPEND_CHAR_TO_STACK('0');
}
APPEND_CHAR_TO_STACK('\n');
}
#undef APPEND_CHAR_TO_STACK
#undef APPEND_STRING_TO_STACK
done:
if (ok)
JS_RestoreExceptionState(cx, state);
else
JS_DropExceptionState(cx, state);
JS_SetErrorReporter(cx, older);
if (!ok) {
JS_free(cx, stackbuf);
return JS_FALSE;
}
if (!stackbuf) {
stack = cx->runtime->emptyString;
} else {
/* NB: if stackbuf was allocated, it has room for the terminator. */
JS_ASSERT(stacklen <= stackmax);
if (stacklen < stackmax) {
/*
* Realloc can fail when shrinking on some FreeBSD versions, so
* don't use JS_realloc here; simply let the oversized allocation
* be owned by the string in that rare case.
*/
void *shrunk = realloc(stackbuf, (stacklen+1) * sizeof(jschar));
if (shrunk)
stackbuf = shrunk;
}
stackbuf[stacklen] = 0;
stack = js_NewString(cx, stackbuf, stacklen, 0);
if (!stack) {
JS_free(cx, stackbuf);
return JS_FALSE;
}
}
return JS_DefineProperty(cx, obj, js_stack_str,
STRING_TO_JSVAL(stack),
NULL, NULL, JSPROP_ENUMERATE);
}
/* XXXbe Consolidate the ugly truth that we don't treat filename as UTF-8
with these two functions. */
static JSString *
FilenameToString(JSContext *cx, const char *filename)
{
return JS_NewStringCopyZ(cx, filename);
}
static const char *
StringToFilename(JSContext *cx, JSString *str)
{
return JS_GetStringBytes(str);
}
static JSBool
Exception(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
JSBool ok;
jsval pval;
uint32 lineno;
JSString *message, *filename;
JSStackFrame *fp;
if (cx->creatingException)
return JS_FALSE;
cx->creatingException = JS_TRUE;
if (!(cx->fp->flags & JSFRAME_CONSTRUCTING)) {
/*
* ECMA ed. 3, 15.11.1 requires Error, etc., to construct even when
* called as functions, without operator new. But as we do not give
* each constructor a distinct JSClass, whose .name member is used by
* js_NewObject to find the class prototype, we must get the class
* prototype ourselves.
*/
ok = OBJ_GET_PROPERTY(cx, JSVAL_TO_OBJECT(argv[-2]),
ATOM_TO_JSID(cx->runtime->atomState
.classPrototypeAtom),
&pval);
if (!ok)
goto out;
obj = js_NewObject(cx, &ExceptionClass, JSVAL_TO_OBJECT(pval), NULL);
if (!obj) {
ok = JS_FALSE;
goto out;
}
*rval = OBJECT_TO_JSVAL(obj);
}
/*
* If it's a new object of class Exception, then null out the private
* data so that the finalizer doesn't attempt to free it.
*/
if (OBJ_GET_CLASS(cx, obj) == &ExceptionClass)
OBJ_SET_SLOT(cx, obj, JSSLOT_PRIVATE, JSVAL_VOID);
/* Set the 'message' property. */
if (argc != 0) {
message = js_ValueToString(cx, argv[0]);
if (!message) {
ok = JS_FALSE;
goto out;
}
argv[0] = STRING_TO_JSVAL(message);
} else {
message = cx->runtime->emptyString;
}
/* Set the 'fileName' property. */
if (argc > 1) {
filename = js_ValueToString(cx, argv[1]);
if (!filename) {
ok = JS_FALSE;
goto out;
}
argv[1] = STRING_TO_JSVAL(filename);
fp = NULL;
} else {
fp = JS_GetScriptedCaller(cx, NULL);
if (fp) {
filename = FilenameToString(cx, fp->script->filename);
if (!filename) {
ok = JS_FALSE;
goto out;
}
} else {
filename = cx->runtime->emptyString;
}
}
/* Set the 'lineNumber' property. */
if (argc > 2) {
ok = js_ValueToECMAUint32(cx, argv[2], &lineno);
if (!ok)
goto out;
} else {
if (!fp)
fp = JS_GetScriptedCaller(cx, NULL);
lineno = (fp && fp->pc) ? js_PCToLineNumber(cx, fp->script, fp->pc) : 0;
}
ok = InitExceptionObject(cx, obj, message, filename, lineno);
out:
cx->creatingException = JS_FALSE;
return ok;
}
/*
* Convert to string.
*
* This method only uses JavaScript-modifiable properties name, message. It
* is left to the host to check for private data and report filename and line
* number information along with this message.
*/
static JSBool
exn_toString(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
jsval v;
JSString *name, *message, *result;
jschar *chars, *cp;
size_t name_length, message_length, length;
if (!OBJ_GET_PROPERTY(cx, obj,
ATOM_TO_JSID(cx->runtime->atomState.nameAtom),
&v)) {
return JS_FALSE;
}
name = JSVAL_IS_STRING(v) ? JSVAL_TO_STRING(v) : cx->runtime->emptyString;
*rval = STRING_TO_JSVAL(name);
if (!JS_GetProperty(cx, obj, js_message_str, &v))
return JS_FALSE;
message = JSVAL_IS_STRING(v) ? JSVAL_TO_STRING(v)
: cx->runtime->emptyString;
if (JSSTRING_LENGTH(message) != 0) {
name_length = JSSTRING_LENGTH(name);
message_length = JSSTRING_LENGTH(message);
length = (name_length ? name_length + 2 : 0) + message_length;
cp = chars = (jschar*) JS_malloc(cx, (length + 1) * sizeof(jschar));
if (!chars)
return JS_FALSE;
if (name_length) {
js_strncpy(cp, JSSTRING_CHARS(name), name_length);
cp += name_length;
*cp++ = ':'; *cp++ = ' ';
}
js_strncpy(cp, JSSTRING_CHARS(message), message_length);
cp += message_length;
*cp = 0;
result = js_NewString(cx, chars, length, 0);
if (!result) {
JS_free(cx, chars);
return JS_FALSE;
}
} else {
result = name;
}
*rval = STRING_TO_JSVAL(result);
return JS_TRUE;
}
#if JS_HAS_TOSOURCE
/*
* Return a string that may eval to something similar to the original object.
*/
static JSBool
exn_toSource(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
jsval *vp;
JSString *name, *message, *filename, *lineno_as_str, *result;
uint32 lineno;
size_t lineno_length, name_length, message_length, filename_length, length;
jschar *chars, *cp;
vp = argv + argc; /* beginning of explicit local roots */
if (!OBJ_GET_PROPERTY(cx, obj,
ATOM_TO_JSID(cx->runtime->atomState.nameAtom),
rval)) {
return JS_FALSE;
}
name = js_ValueToString(cx, *rval);
if (!name)
return JS_FALSE;
*rval = STRING_TO_JSVAL(name);
if (!JS_GetProperty(cx, obj, js_message_str, &vp[0]) ||
!(message = js_ValueToSource(cx, vp[0]))) {
return JS_FALSE;
}
vp[0] = STRING_TO_JSVAL(message);
if (!JS_GetProperty(cx, obj, js_filename_str, &vp[1]) ||
!(filename = js_ValueToSource(cx, vp[1]))) {
return JS_FALSE;
}
vp[1] = STRING_TO_JSVAL(filename);
if (!JS_GetProperty(cx, obj, js_lineno_str, &vp[2]) ||
!js_ValueToECMAUint32 (cx, vp[2], &lineno)) {
return JS_FALSE;
}
if (lineno != 0) {
lineno_as_str = js_ValueToString(cx, vp[2]);
if (!lineno_as_str)
return JS_FALSE;
lineno_length = JSSTRING_LENGTH(lineno_as_str);
} else {
lineno_as_str = NULL;
lineno_length = 0;
}
/* Magic 8, for the characters in ``(new ())''. */
name_length = JSSTRING_LENGTH(name);
message_length = JSSTRING_LENGTH(message);
length = 8 + name_length + message_length;
filename_length = JSSTRING_LENGTH(filename);
if (filename_length != 0) {
/* append filename as ``, {filename}'' */
length += 2 + filename_length;
if (lineno_as_str) {
/* append lineno as ``, {lineno_as_str}'' */
length += 2 + lineno_length;
}
} else {
if (lineno_as_str) {
/*
* no filename, but have line number,
* need to append ``, "", {lineno_as_str}''
*/
length += 6 + lineno_length;
}
}
cp = chars = (jschar*) JS_malloc(cx, (length + 1) * sizeof(jschar));
if (!chars)
return JS_FALSE;
*cp++ = '('; *cp++ = 'n'; *cp++ = 'e'; *cp++ = 'w'; *cp++ = ' ';
js_strncpy(cp, JSSTRING_CHARS(name), name_length);
cp += name_length;
*cp++ = '(';
if (message_length != 0) {
js_strncpy(cp, JSSTRING_CHARS(message), message_length);
cp += message_length;
}
if (filename_length != 0) {
/* append filename as ``, {filename}'' */
*cp++ = ','; *cp++ = ' ';
js_strncpy(cp, JSSTRING_CHARS(filename), filename_length);
cp += filename_length;
} else {
if (lineno_as_str) {
/*
* no filename, but have line number,
* need to append ``, "", {lineno_as_str}''
*/
*cp++ = ','; *cp++ = ' '; *cp++ = '"'; *cp++ = '"';
}
}
if (lineno_as_str) {
/* append lineno as ``, {lineno_as_str}'' */
*cp++ = ','; *cp++ = ' ';
js_strncpy(cp, JSSTRING_CHARS(lineno_as_str), lineno_length);
cp += lineno_length;
}
*cp++ = ')'; *cp++ = ')'; *cp = 0;
result = js_NewString(cx, chars, length, 0);
if (!result) {
JS_free(cx, chars);
return JS_FALSE;
}
*rval = STRING_TO_JSVAL(result);
return JS_TRUE;
}
#endif
static JSFunctionSpec exception_methods[] = {
#if JS_HAS_TOSOURCE
{js_toSource_str, exn_toSource, 0,0,3},
#endif
{js_toString_str, exn_toString, 0,0,0},
{0,0,0,0,0}
};
JSObject *
js_InitExceptionClasses(JSContext *cx, JSObject *obj)
{
JSObject *obj_proto, *protos[JSEXN_LIMIT];
int i;
/*
* If lazy class initialization occurs for any Error subclass, then all
* classes are initialized, starting with Error. To avoid reentry and
* redundant initialization, we must not pass a null proto parameter to
* js_NewObject below, when called for the Error superclass. We need to
* ensure that Object.prototype is the proto of Error.prototype.
*
* See the equivalent code to ensure that parent_proto is non-null when
* JS_InitClass calls js_NewObject, in jsapi.c.
*/
if (!js_GetClassPrototype(cx, obj, INT_TO_JSID(JSProto_Object),
&obj_proto)) {
return NULL;
}
if (!js_EnterLocalRootScope(cx))
return NULL;
/* Initialize the prototypes first. */
for (i = 0; exceptions[i].name != 0; i++) {
JSAtom *atom;
JSFunction *fun;
JSString *nameString;
int protoIndex = exceptions[i].protoIndex;
/* Make the prototype for the current constructor name. */
protos[i] = js_NewObject(cx, &ExceptionClass,
(protoIndex != JSEXN_NONE)
? protos[protoIndex]
: obj_proto,
obj);
if (!protos[i])
break;
/* So exn_finalize knows whether to destroy private data. */
OBJ_SET_SLOT(cx, protos[i], JSSLOT_PRIVATE, JSVAL_VOID);
/* Make a constructor function for the current name. */
atom = cx->runtime->atomState.classAtoms[exceptions[i].key];
fun = js_DefineFunction(cx, obj, atom, exceptions[i].native, 3, 0);
if (!fun)
break;
/* Make this constructor make objects of class Exception. */
fun->clasp = &ExceptionClass;
/* Make the prototype and constructor links. */
if (!js_SetClassPrototype(cx, fun->object, protos[i],
JSPROP_READONLY | JSPROP_PERMANENT)) {
break;
}
/* proto bootstrap bit from JS_InitClass omitted. */
nameString = JS_NewStringCopyZ(cx, exceptions[i].name);
if (!nameString)
break;
/* Add the name property to the prototype. */
if (!JS_DefineProperty(cx, protos[i], js_name_str,
STRING_TO_JSVAL(nameString),
NULL, NULL,
JSPROP_ENUMERATE)) {
break;
}
}
js_LeaveLocalRootScope(cx);
if (exceptions[i].name)
return NULL;
/*
* Add an empty message property. (To Exception.prototype only,
* because this property will be the same for all the exception
* protos.)
*/
if (!JS_DefineProperty(cx, protos[0], js_message_str,
STRING_TO_JSVAL(cx->runtime->emptyString),
NULL, NULL, JSPROP_ENUMERATE)) {
return NULL;
}
if (!JS_DefineProperty(cx, protos[0], js_filename_str,
STRING_TO_JSVAL(cx->runtime->emptyString),
NULL, NULL, JSPROP_ENUMERATE)) {
return NULL;
}
if (!JS_DefineProperty(cx, protos[0], js_lineno_str,
INT_TO_JSVAL(0),
NULL, NULL, JSPROP_ENUMERATE)) {
return NULL;
}
/*
* Add methods only to Exception.prototype, because ostensibly all
* exception types delegate to that.
*/
if (!JS_DefineFunctions(cx, protos[0], exception_methods))
return NULL;
return protos[0];
}
const JSErrorFormatString*
js_GetLocalizedErrorMessage(JSContext* cx, void *userRef, const char *locale, const uintN errorNumber)
{
const JSErrorFormatString *errorString = NULL;
if (cx->localeCallbacks && cx->localeCallbacks->localeGetErrorMessage) {
errorString = cx->localeCallbacks
->localeGetErrorMessage(userRef, locale, errorNumber);
}
if (!errorString)
errorString = js_GetErrorMessage(userRef, locale, errorNumber);
return errorString;
}
#if defined ( DEBUG_mccabe ) && defined ( PRINTNAMES )
/* For use below... get character strings for error name and exception name */
static struct exnname { char *name; char *exception; } errortoexnname[] = {
#define MSG_DEF(name, number, count, exception, format) \
{#name, #exception},
#include "js.msg"
#undef MSG_DEF
};
#endif /* DEBUG */
JSBool
js_ErrorToException(JSContext *cx, const char *message, JSErrorReport *reportp)
{
JSErrNum errorNumber;
JSExnType exn;
JSBool ok;
JSObject *errProto, *errObject;
JSString *messageStr, *filenameStr;
uintN lineno;
JSExnPrivate *privateData;
const JSErrorFormatString *errorString;
/*
* Tell our caller to report immediately if cx has no active frames, or if
* this report is just a warning.
*/
JS_ASSERT(reportp);
if (!cx->fp || JSREPORT_IS_WARNING(reportp->flags))
return JS_FALSE;
/* Find the exception index associated with this error. */
errorNumber = (JSErrNum) reportp->errorNumber;
errorString = js_GetLocalizedErrorMessage(cx, NULL, NULL, errorNumber);
exn = errorString ? errorString->exnType : JSEXN_NONE;
JS_ASSERT(exn < JSEXN_LIMIT);
#if defined( DEBUG_mccabe ) && defined ( PRINTNAMES )
/* Print the error name and the associated exception name to stderr */
fprintf(stderr, "%s\t%s\n",
errortoexnname[errorNumber].name,
errortoexnname[errorNumber].exception);
#endif
/*
* Return false (no exception raised) if no exception is associated
* with the given error number.
*/
if (exn == JSEXN_NONE)
return JS_FALSE;
/*
* Prevent runaway recursion, just as the Exception native constructor
* must do, via cx->creatingException. If an out-of-memory error occurs,
* no exception object will be created, but we don't assume that OOM is
* the only kind of error that subroutines of this function called below
* might raise.
*/
if (cx->creatingException)
return JS_FALSE;
cx->creatingException = JS_TRUE;
/* Protect the newly-created strings below from nesting GCs. */
ok = js_EnterLocalRootScope(cx);
if (!ok)
goto out;
/*
* Try to get an appropriate prototype by looking up the corresponding
* exception constructor name in the scope chain of the current context's
* top stack frame, or in the global object if no frame is active.
*/
ok = js_GetClassPrototype(cx, NULL, INT_TO_JSID(exceptions[exn].key),
&errProto);
if (!ok)
goto out;
errObject = js_NewObject(cx, &ExceptionClass, errProto, NULL);
if (!errObject) {
ok = JS_FALSE;
goto out;
}
/*
* Set the generated Exception object early, so it won't be GC'd by a last
* ditch attempt to collect garbage, or a GC that otherwise nests or races
* under any of the following calls. If one of the following calls fails,
* it will overwrite this exception object with one of its own (except in
* case of OOM errors, of course).
*/
JS_SetPendingException(cx, OBJECT_TO_JSVAL(errObject));
messageStr = JS_NewStringCopyZ(cx, message);
if (!messageStr) {
ok = JS_FALSE;
goto out;
}
filenameStr = JS_NewStringCopyZ(cx, reportp->filename);
if (!filenameStr) {
ok = JS_FALSE;
goto out;
}
lineno = reportp->lineno;
ok = InitExceptionObject(cx, errObject, messageStr, filenameStr, lineno);
if (!ok)
goto out;
/*
* Construct a new copy of the error report struct, and store it in the
* exception object's private data. We can't use the error report struct
* that was passed in, because it's stack-allocated, and also because it
* may point to transient data in the JSTokenStream.
*/
privateData = exn_newPrivate(cx, reportp);
if (!privateData) {
ok = JS_FALSE;
goto out;
}
OBJ_SET_SLOT(cx, errObject, JSSLOT_PRIVATE, PRIVATE_TO_JSVAL(privateData));
/* Flag the error report passed in to indicate an exception was raised. */
reportp->flags |= JSREPORT_EXCEPTION;
out:
js_LeaveLocalRootScope(cx);
cx->creatingException = JS_FALSE;
return ok;
}
JSBool
js_ReportUncaughtException(JSContext *cx)
{
jsval exn, *vp;
JSObject *exnObject;
void *mark;
JSErrorReport *reportp, report;
JSString *str;
const char *bytes;
JSBool ok;
if (!JS_IsExceptionPending(cx))
return JS_TRUE;
if (!JS_GetPendingException(cx, &exn))
return JS_FALSE;
/*
* Because js_ValueToString below could error and an exception object
* could become unrooted, we must root exnObject. Later, if exnObject is
* non-null, we need to root other intermediates, so allocate an operand
* stack segment to protect all of these values.
*/
if (JSVAL_IS_PRIMITIVE(exn)) {
exnObject = NULL;
vp = NULL;
#ifdef __GNUC__ /* suppress bogus gcc warnings */
mark = NULL;
#endif
} else {
exnObject = JSVAL_TO_OBJECT(exn);
vp = js_AllocStack(cx, 5, &mark);
if (!vp) {
ok = JS_FALSE;
goto out;
}
vp[0] = exn;
}
reportp = js_ErrorFromException(cx, exn);
/* XXX L10N angels cry once again (see also jsemit.c, /L10N gaffes/) */
str = js_ValueToString(cx, exn);
if (!str) {
bytes = "unknown (can't convert to string)";
} else {
if (vp)
vp[1] = STRING_TO_JSVAL(str);
bytes = js_GetStringBytes(cx->runtime, str);
}
ok = JS_TRUE;
if (!reportp &&
exnObject &&
OBJ_GET_CLASS(cx, exnObject) == &ExceptionClass) {
const char *filename;
uint32 lineno;
ok = JS_GetProperty(cx, exnObject, js_message_str, &vp[2]);
if (!ok)
goto out;
if (JSVAL_IS_STRING(vp[2]))
bytes = JS_GetStringBytes(JSVAL_TO_STRING(vp[2]));
ok = JS_GetProperty(cx, exnObject, js_filename_str, &vp[3]);
if (!ok)
goto out;
str = js_ValueToString(cx, vp[3]);
if (!str) {
ok = JS_FALSE;
goto out;
}
filename = StringToFilename(cx, str);
ok = JS_GetProperty(cx, exnObject, js_lineno_str, &vp[4]);
if (!ok)
goto out;
ok = js_ValueToECMAUint32 (cx, vp[4], &lineno);
if (!ok)
goto out;
reportp = &report;
memset(&report, 0, sizeof report);
report.filename = filename;
report.lineno = (uintN) lineno;
}
if (!reportp) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_UNCAUGHT_EXCEPTION, bytes);
} else {
/* Flag the error as an exception. */
reportp->flags |= JSREPORT_EXCEPTION;
js_ReportErrorAgain(cx, bytes, reportp);
}
JS_ClearPendingException(cx);
out:
if (exnObject)
js_FreeStack(cx, mark);
return ok;
}
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