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jsexn.cpp
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jsexn.cpp
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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=78:
*
* ***** 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 <stdlib.h>
#include <string.h>
#include "jstypes.h"
#include "jsstdint.h"
#include "jsbit.h"
#include "jsutil.h"
#include "jsprf.h"
#include "jsapi.h"
#include "jscntxt.h"
#include "jsversion.h"
#include "jsexn.h"
#include "jsfun.h"
#include "jsgc.h"
#include "jsgcmark.h"
#include "jsinterp.h"
#include "jsnum.h"
#include "jsobj.h"
#include "jsopcode.h"
#include "jsscope.h"
#include "jsscript.h"
#include "jsstaticcheck.h"
#include "jswrapper.h"
#include "jsobjinlines.h"
#include "vm/Stack-inl.h"
using namespace js;
using namespace js::gc;
/* Forward declarations for js_ErrorClass's initializer. */
static JSBool
Exception(JSContext *cx, uintN argc, Value *vp);
static void
exn_trace(JSTracer *trc, JSObject *obj);
static void
exn_finalize(JSContext *cx, JSObject *obj);
static JSBool
exn_resolve(JSContext *cx, JSObject *obj, jsid id, uintN flags,
JSObject **objp);
Class js_ErrorClass = {
js_Error_str,
JSCLASS_HAS_PRIVATE | JSCLASS_NEW_RESOLVE |
JSCLASS_HAS_CACHED_PROTO(JSProto_Error),
PropertyStub, /* addProperty */
PropertyStub, /* delProperty */
PropertyStub, /* getProperty */
StrictPropertyStub, /* setProperty */
EnumerateStub,
(JSResolveOp)exn_resolve,
ConvertStub,
exn_finalize,
NULL, /* reserved0 */
NULL, /* checkAccess */
NULL, /* call */
NULL, /* construct */
NULL, /* xdrObject */
NULL, /* hasInstance */
exn_trace
};
typedef struct JSStackTraceElem {
JSString *funName;
size_t argc;
const char *filename;
uintN ulineno;
} JSStackTraceElem;
typedef struct JSExnPrivate {
/* A copy of the JSErrorReport originally generated. */
JSErrorReport *errorReport;
JSString *message;
JSString *filename;
uintN lineno;
size_t stackDepth;
JSStackTraceElem stackElems[1];
} JSExnPrivate;
static JSString *
StackTraceToString(JSContext *cx, JSExnPrivate *priv);
static JSErrorReport *
CopyErrorReport(JSContext *cx, JSErrorReport *report)
{
/*
* We use a single malloc block to make a deep copy of JSErrorReport with
* the following layout:
* JSErrorReport
* array of copies of report->messageArgs
* jschar array with characters for all messageArgs
* jschar array with characters for ucmessage
* jschar array with characters for uclinebuf and uctokenptr
* char array with characters for linebuf and tokenptr
* char array with characters for filename
* Such layout together with the properties enforced by the following
* asserts does not need any extra alignment padding.
*/
JS_STATIC_ASSERT(sizeof(JSErrorReport) % sizeof(const char *) == 0);
JS_STATIC_ASSERT(sizeof(const char *) % sizeof(jschar) == 0);
size_t filenameSize;
size_t linebufSize;
size_t uclinebufSize;
size_t ucmessageSize;
size_t i, argsArraySize, argsCopySize, argSize;
size_t mallocSize;
JSErrorReport *copy;
uint8 *cursor;
#define JS_CHARS_SIZE(jschars) ((js_strlen(jschars) + 1) * sizeof(jschar))
filenameSize = report->filename ? strlen(report->filename) + 1 : 0;
linebufSize = report->linebuf ? strlen(report->linebuf) + 1 : 0;
uclinebufSize = report->uclinebuf ? JS_CHARS_SIZE(report->uclinebuf) : 0;
ucmessageSize = 0;
argsArraySize = 0;
argsCopySize = 0;
if (report->ucmessage) {
ucmessageSize = JS_CHARS_SIZE(report->ucmessage);
if (report->messageArgs) {
for (i = 0; report->messageArgs[i]; ++i)
argsCopySize += JS_CHARS_SIZE(report->messageArgs[i]);
/* Non-null messageArgs should have at least one non-null arg. */
JS_ASSERT(i != 0);
argsArraySize = (i + 1) * sizeof(const jschar *);
}
}
/*
* The mallocSize can not overflow since it represents the sum of the
* sizes of already allocated objects.
*/
mallocSize = sizeof(JSErrorReport) + argsArraySize + argsCopySize +
ucmessageSize + uclinebufSize + linebufSize + filenameSize;
cursor = (uint8 *)cx->malloc_(mallocSize);
if (!cursor)
return NULL;
copy = (JSErrorReport *)cursor;
memset(cursor, 0, sizeof(JSErrorReport));
cursor += sizeof(JSErrorReport);
if (argsArraySize != 0) {
copy->messageArgs = (const jschar **)cursor;
cursor += argsArraySize;
for (i = 0; report->messageArgs[i]; ++i) {
copy->messageArgs[i] = (const jschar *)cursor;
argSize = JS_CHARS_SIZE(report->messageArgs[i]);
memcpy(cursor, report->messageArgs[i], argSize);
cursor += argSize;
}
copy->messageArgs[i] = NULL;
JS_ASSERT(cursor == (uint8 *)copy->messageArgs[0] + argsCopySize);
}
if (report->ucmessage) {
copy->ucmessage = (const jschar *)cursor;
memcpy(cursor, report->ucmessage, ucmessageSize);
cursor += ucmessageSize;
}
if (report->uclinebuf) {
copy->uclinebuf = (const jschar *)cursor;
memcpy(cursor, report->uclinebuf, uclinebufSize);
cursor += uclinebufSize;
if (report->uctokenptr) {
copy->uctokenptr = copy->uclinebuf + (report->uctokenptr -
report->uclinebuf);
}
}
if (report->linebuf) {
copy->linebuf = (const char *)cursor;
memcpy(cursor, report->linebuf, linebufSize);
cursor += linebufSize;
if (report->tokenptr) {
copy->tokenptr = copy->linebuf + (report->tokenptr -
report->linebuf);
}
}
if (report->filename) {
copy->filename = (const char *)cursor;
memcpy(cursor, report->filename, filenameSize);
}
JS_ASSERT(cursor + filenameSize == (uint8 *)copy + mallocSize);
/* Copy non-pointer members. */
copy->lineno = report->lineno;
copy->errorNumber = report->errorNumber;
/* Note that this is before it gets flagged with JSREPORT_EXCEPTION */
copy->flags = report->flags;
#undef JS_CHARS_SIZE
return copy;
}
static jsval *
GetStackTraceValueBuffer(JSExnPrivate *priv)
{
/*
* We use extra memory after JSExnPrivateInfo.stackElems to store jsvals
* that helps to produce more informative stack traces. The following
* assert allows us to assume that no gap after stackElems is necessary to
* align the buffer properly.
*/
JS_STATIC_ASSERT(sizeof(JSStackTraceElem) % sizeof(jsval) == 0);
return (jsval *)(priv->stackElems + priv->stackDepth);
}
static JSBool
InitExnPrivate(JSContext *cx, JSObject *exnObject, JSString *message,
JSString *filename, uintN lineno, JSErrorReport *report)
{
JSSecurityCallbacks *callbacks;
CheckAccessOp checkAccess;
JSErrorReporter older;
JSExceptionState *state;
jsid callerid;
StackFrame *fp, *fpstop;
size_t stackDepth, valueCount, size;
JSBool overflow;
JSExnPrivate *priv;
JSStackTraceElem *elem;
jsval *values;
JS_ASSERT(exnObject->getClass() == &js_ErrorClass);
/*
* Prepare stack trace data.
*
* 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.
*/
callbacks = JS_GetSecurityCallbacks(cx);
checkAccess = callbacks
? Valueify(callbacks->checkObjectAccess)
: NULL;
older = JS_SetErrorReporter(cx, NULL);
state = JS_SaveExceptionState(cx);
callerid = ATOM_TO_JSID(cx->runtime->atomState.callerAtom);
stackDepth = 0;
valueCount = 0;
for (fp = js_GetTopStackFrame(cx); fp; fp = fp->prev()) {
if (fp->compartment() != cx->compartment)
break;
if (fp->isNonEvalFunctionFrame()) {
Value v = NullValue();
if (checkAccess &&
!checkAccess(cx, &fp->callee(), callerid, JSACC_READ, &v)) {
break;
}
valueCount += fp->numActualArgs();
}
++stackDepth;
}
JS_RestoreExceptionState(cx, state);
JS_SetErrorReporter(cx, older);
fpstop = fp;
size = offsetof(JSExnPrivate, stackElems);
overflow = (stackDepth > ((size_t)-1 - size) / sizeof(JSStackTraceElem));
size += stackDepth * sizeof(JSStackTraceElem);
overflow |= (valueCount > ((size_t)-1 - size) / sizeof(jsval));
size += valueCount * sizeof(jsval);
if (overflow) {
js_ReportAllocationOverflow(cx);
return JS_FALSE;
}
priv = (JSExnPrivate *)cx->malloc_(size);
if (!priv)
return JS_FALSE;
/*
* We initialize errorReport with a copy of report after setting the
* private slot, to prevent GC accessing a junk value we clear the field
* here.
*/
priv->errorReport = NULL;
priv->message = message;
priv->filename = filename;
priv->lineno = lineno;
priv->stackDepth = stackDepth;
values = GetStackTraceValueBuffer(priv);
elem = priv->stackElems;
for (fp = js_GetTopStackFrame(cx); fp != fpstop; fp = fp->prev()) {
if (fp->compartment() != cx->compartment)
break;
if (!fp->isFunctionFrame() || fp->isEvalFrame()) {
elem->funName = NULL;
elem->argc = 0;
} else {
elem->funName = fp->fun()->atom
? fp->fun()->atom
: cx->runtime->emptyString;
elem->argc = fp->numActualArgs();
fp->forEachCanonicalActualArg(CopyTo(Valueify(values)));
values += elem->argc;
}
elem->ulineno = 0;
elem->filename = NULL;
if (fp->isScriptFrame()) {
elem->filename = fp->script()->filename;
if (fp->pc(cx))
elem->ulineno = js_FramePCToLineNumber(cx, fp);
}
++elem;
}
JS_ASSERT(priv->stackElems + stackDepth == elem);
JS_ASSERT(GetStackTraceValueBuffer(priv) + valueCount == values);
exnObject->setPrivate(priv);
if (report) {
/*
* Construct a new copy of the error report struct. We can't use the
* error report struct that was passed in, because it's allocated on
* the stack, and also because it may point to transient data in the
* TokenStream.
*/
priv->errorReport = CopyErrorReport(cx, report);
if (!priv->errorReport) {
/* The finalizer realeases priv since it is in the private slot. */
return JS_FALSE;
}
}
return JS_TRUE;
}
static inline JSExnPrivate *
GetExnPrivate(JSContext *cx, JSObject *obj)
{
return (JSExnPrivate *) obj->getPrivate();
}
static void
exn_trace(JSTracer *trc, JSObject *obj)
{
JSExnPrivate *priv;
JSStackTraceElem *elem;
size_t vcount, i;
jsval *vp, v;
priv = GetExnPrivate(trc->context, obj);
if (priv) {
if (priv->message)
MarkString(trc, priv->message, "exception message");
if (priv->filename)
MarkString(trc, priv->filename, "exception filename");
elem = priv->stackElems;
for (vcount = i = 0; i != priv->stackDepth; ++i, ++elem) {
if (elem->funName)
MarkString(trc, elem->funName, "stack trace function name");
if (IS_GC_MARKING_TRACER(trc) && elem->filename)
js_MarkScriptFilename(elem->filename);
vcount += elem->argc;
}
vp = GetStackTraceValueBuffer(priv);
for (i = 0; i != vcount; ++i, ++vp) {
v = *vp;
JS_CALL_VALUE_TRACER(trc, v, "stack trace argument");
}
}
}
static void
exn_finalize(JSContext *cx, JSObject *obj)
{
JSExnPrivate *priv;
priv = GetExnPrivate(cx, obj);
if (priv) {
if (priv->errorReport)
cx->free_(priv->errorReport);
cx->free_(priv);
}
}
static JSBool
exn_resolve(JSContext *cx, JSObject *obj, jsid id, uintN flags,
JSObject **objp)
{
JSExnPrivate *priv;
JSString *str;
JSAtom *atom;
JSString *stack;
const char *prop;
jsval v;
uintN attrs;
*objp = NULL;
priv = GetExnPrivate(cx, obj);
if (priv && JSID_IS_ATOM(id)) {
str = JSID_TO_STRING(id);
atom = cx->runtime->atomState.messageAtom;
if (str == atom) {
prop = js_message_str;
/*
* Per ES5 15.11.1.1, if Error is called with no argument or with
* undefined as the argument, it returns an Error object with no
* own message property.
*/
if (!priv->message)
return true;
v = STRING_TO_JSVAL(priv->message);
attrs = 0;
goto define;
}
atom = cx->runtime->atomState.fileNameAtom;
if (str == atom) {
prop = js_fileName_str;
v = STRING_TO_JSVAL(priv->filename);
attrs = JSPROP_ENUMERATE;
goto define;
}
atom = cx->runtime->atomState.lineNumberAtom;
if (str == atom) {
prop = js_lineNumber_str;
v = INT_TO_JSVAL(priv->lineno);
attrs = JSPROP_ENUMERATE;
goto define;
}
atom = cx->runtime->atomState.stackAtom;
if (str == atom) {
stack = StackTraceToString(cx, priv);
if (!stack)
return false;
/* Allow to GC all things that were used to build stack trace. */
priv->stackDepth = 0;
prop = js_stack_str;
v = STRING_TO_JSVAL(stack);
attrs = JSPROP_ENUMERATE;
goto define;
}
}
return true;
define:
if (!JS_DefineProperty(cx, obj, prop, v, NULL, NULL, attrs))
return false;
*objp = obj;
return true;
}
JSErrorReport *
js_ErrorFromException(JSContext *cx, jsval exn)
{
JSObject *obj;
JSExnPrivate *priv;
if (JSVAL_IS_PRIMITIVE(exn))
return NULL;
obj = JSVAL_TO_OBJECT(exn);
if (obj->getClass() != &js_ErrorClass)
return NULL;
priv = GetExnPrivate(cx, obj);
if (!priv)
return NULL;
return priv->errorReport;
}
static JSString *
ValueToShortSource(JSContext *cx, jsval v)
{
JSString *str;
/* Avoid toSource bloat and fallibility for object types. */
if (JSVAL_IS_PRIMITIVE(v))
return js_ValueToSource(cx, Valueify(v));
AutoCompartment ac(cx, JSVAL_TO_OBJECT(v));
if (!ac.enter())
return NULL;
if (VALUE_IS_FUNCTION(cx, v)) {
/*
* XXX Avoid function decompilation bloat for now.
*/
str = JS_GetFunctionId(JS_ValueToFunction(cx, v));
if (!str && !(str = js_ValueToSource(cx, Valueify(v)))) {
/*
* Continue to soldier on if the function couldn't be
* converted into a string.
*/
JS_ClearPendingException(cx);
str = JS_NewStringCopyZ(cx, "[unknown function]");
}
} 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]",
JSVAL_TO_OBJECT(v)->getClass()->name);
str = JS_NewStringCopyZ(cx, buf);
}
ac.leave();
if (!str || !cx->compartment->wrap(cx, &str))
return NULL;
return str;
}
static JSString *
StackTraceToString(JSContext *cx, JSExnPrivate *priv)
{
jschar *stackbuf;
size_t stacklen, stackmax;
JSStackTraceElem *elem, *endElem;
jsval *values;
size_t i;
JSString *str;
const char *cp;
char ulnbuf[11];
/* After this point, failing control flow must goto bad. */
stackbuf = NULL;
stacklen = stackmax = 0;
/* Limit the stackbuf length to a reasonable value to avoid overflow checks. */
#define STACK_LENGTH_LIMIT JS_BIT(20)
#define APPEND_CHAR_TO_STACK(c) \
JS_BEGIN_MACRO \
if (stacklen == stackmax) { \
void *ptr_; \
if (stackmax >= STACK_LENGTH_LIMIT) \
goto done; \
stackmax = stackmax ? 2 * stackmax : 64; \
ptr_ = cx->realloc_(stackbuf, (stackmax+1) * sizeof(jschar)); \
if (!ptr_) \
goto bad; \
stackbuf = (jschar *) ptr_; \
} \
stackbuf[stacklen++] = (c); \
JS_END_MACRO
#define APPEND_STRING_TO_STACK(str) \
JS_BEGIN_MACRO \
JSString *str_ = str; \
size_t length_ = str_->length(); \
const jschar *chars_ = str_->getChars(cx); \
if (!chars_) \
goto bad; \
\
if (length_ > stackmax - stacklen) { \
void *ptr_; \
if (stackmax >= STACK_LENGTH_LIMIT || \
length_ >= STACK_LENGTH_LIMIT - stacklen) { \
goto done; \
} \
stackmax = JS_BIT(JS_CeilingLog2(stacklen + length_)); \
ptr_ = cx->realloc_(stackbuf, (stackmax+1) * sizeof(jschar)); \
if (!ptr_) \
goto bad; \
stackbuf = (jschar *) ptr_; \
} \
js_strncpy(stackbuf + stacklen, chars_, length_); \
stacklen += length_; \
JS_END_MACRO
values = GetStackTraceValueBuffer(priv);
elem = priv->stackElems;
for (endElem = elem + priv->stackDepth; elem != endElem; elem++) {
if (elem->funName) {
APPEND_STRING_TO_STACK(elem->funName);
APPEND_CHAR_TO_STACK('(');
for (i = 0; i != elem->argc; i++, values++) {
if (i > 0)
APPEND_CHAR_TO_STACK(',');
str = ValueToShortSource(cx, *values);
if (!str)
goto bad;
APPEND_STRING_TO_STACK(str);
}
APPEND_CHAR_TO_STACK(')');
}
APPEND_CHAR_TO_STACK('@');
if (elem->filename) {
for (cp = elem->filename; *cp; cp++)
APPEND_CHAR_TO_STACK(*cp);
}
APPEND_CHAR_TO_STACK(':');
JS_snprintf(ulnbuf, sizeof ulnbuf, "%u", elem->ulineno);
for (cp = ulnbuf; *cp; cp++)
APPEND_CHAR_TO_STACK(*cp);
APPEND_CHAR_TO_STACK('\n');
}
#undef APPEND_CHAR_TO_STACK
#undef APPEND_STRING_TO_STACK
#undef STACK_LENGTH_LIMIT
done:
if (stacklen == 0) {
JS_ASSERT(!stackbuf);
return cx->runtime->emptyString;
}
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 = cx->realloc_(stackbuf, (stacklen+1) * sizeof(jschar));
if (shrunk)
stackbuf = (jschar *) shrunk;
}
stackbuf[stacklen] = 0;
str = js_NewString(cx, stackbuf, stacklen);
if (str)
return str;
bad:
if (stackbuf)
cx->free_(stackbuf);
return NULL;
}
/* 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 JSBool
Exception(JSContext *cx, uintN argc, Value *vp)
{
JSString *message, *filename;
StackFrame *fp;
/*
* 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
* NewNativeClassInstance to find the class prototype, we must get the
* class prototype ourselves.
*/
JSObject &callee = vp[0].toObject();
Value protov;
if (!callee.getProperty(cx, ATOM_TO_JSID(cx->runtime->atomState.classPrototypeAtom), &protov))
return JS_FALSE;
if (!protov.isObject()) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_BAD_PROTOTYPE, "Error");
return JS_FALSE;
}
JSObject *errProto = &protov.toObject();
JSObject *obj = NewNativeClassInstance(cx, &js_ErrorClass, errProto, errProto->getParent());
if (!obj)
return JS_FALSE;
/*
* 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->getClass() == &js_ErrorClass)
obj->setPrivate(NULL);
/* Set the 'message' property. */
Value *argv = vp + 2;
if (argc != 0 && !argv[0].isUndefined()) {
message = js_ValueToString(cx, argv[0]);
if (!message)
return JS_FALSE;
argv[0].setString(message);
} else {
message = NULL;
}
/* Set the 'fileName' property. */
if (argc > 1) {
filename = js_ValueToString(cx, argv[1]);
if (!filename)
return JS_FALSE;
argv[1].setString(filename);
fp = NULL;
} else {
fp = js_GetScriptedCaller(cx, NULL);
if (fp) {
filename = FilenameToString(cx, fp->script()->filename);
if (!filename)
return JS_FALSE;
} else {
filename = cx->runtime->emptyString;
}
}
/* Set the 'lineNumber' property. */
uint32_t lineno;
if (argc > 2) {
if (!ValueToECMAUint32(cx, argv[2], &lineno))
return JS_FALSE;
} else {
if (!fp)
fp = js_GetScriptedCaller(cx, NULL);
lineno = (fp && fp->pc(cx)) ? js_FramePCToLineNumber(cx, fp) : 0;
}
if (obj->getClass() == &js_ErrorClass &&
!InitExnPrivate(cx, obj, message, filename, lineno, NULL)) {
return JS_FALSE;
}
vp->setObject(*obj);
return JS_TRUE;
}
/*
* 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, uintN argc, Value *vp)
{
jsval v;
JSString *name, *message, *result;
jschar *chars, *cp;
size_t name_length, message_length, length;
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return JS_FALSE;
if (!obj->getProperty(cx, ATOM_TO_JSID(cx->runtime->atomState.nameAtom), Valueify(&v)))
return JS_FALSE;
name = JSVAL_IS_STRING(v) ? JSVAL_TO_STRING(v) : cx->runtime->emptyString;
vp->setString(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 (message->length() != 0) {
name_length = name->length();
message_length = message->length();
length = (name_length ? name_length + 2 : 0) + message_length;
cp = chars = (jschar *) cx->malloc_((length + 1) * sizeof(jschar));
if (!chars)
return JS_FALSE;
if (name_length) {
const jschar *name_chars = name->getChars(cx);
if (!name_chars)
return JS_FALSE;
js_strncpy(cp, name_chars, name_length);
cp += name_length;
*cp++ = ':'; *cp++ = ' ';
}
const jschar *message_chars = message->getChars(cx);
if (!message_chars)
return JS_FALSE;
js_strncpy(cp, message_chars, message_length);
cp += message_length;
*cp = 0;
result = js_NewString(cx, chars, length);
if (!result) {
cx->free_(chars);
return JS_FALSE;
}
} else {
result = name;
}
vp->setString(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, uintN argc, Value *vp)
{
JSString *name, *message, *filename, *lineno_as_str, *result;
jsval localroots[3] = {JSVAL_NULL, JSVAL_NULL, JSVAL_NULL};
size_t lineno_length, name_length, message_length, filename_length, length;
jschar *chars, *cp;
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return false;
if (!obj->getProperty(cx, ATOM_TO_JSID(cx->runtime->atomState.nameAtom), vp))
return false;
name = js_ValueToString(cx, *vp);
if (!name)
return false;
vp->setString(name);
{
AutoArrayRooter tvr(cx, JS_ARRAY_LENGTH(localroots), Valueify(localroots));
#ifdef __GNUC__
message = filename = NULL;
#endif
if (!JS_GetProperty(cx, obj, js_message_str, &localroots[0]) ||
!(message = js_ValueToSource(cx, Valueify(localroots[0])))) {
return false;
}
localroots[0] = STRING_TO_JSVAL(message);
if (!JS_GetProperty(cx, obj, js_fileName_str, &localroots[1]) ||
!(filename = js_ValueToSource(cx, Valueify(localroots[1])))) {
return false;
}
localroots[1] = STRING_TO_JSVAL(filename);
if (!JS_GetProperty(cx, obj, js_lineNumber_str, &localroots[2]))
return false;
uint32_t lineno;
if (!ValueToECMAUint32(cx, Valueify(localroots[2]), &lineno))
return false;
if (lineno != 0) {
lineno_as_str = js_ValueToString(cx, Valueify(localroots[2]));
if (!lineno_as_str)
return false;
lineno_length = lineno_as_str->length();
} else {
lineno_as_str = NULL;
lineno_length = 0;
}
/* Magic 8, for the characters in ``(new ())''. */
name_length = name->length();
message_length = message->length();
length = 8 + name_length + message_length;
filename_length = filename->length();
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 *) cx->malloc_((length + 1) * sizeof(jschar));
if (!chars)
return false;
*cp++ = '('; *cp++ = 'n'; *cp++ = 'e'; *cp++ = 'w'; *cp++ = ' ';
const jschar *name_chars = name->getChars(cx);
if (!name_chars)
return false;
js_strncpy(cp, name_chars, name_length);
cp += name_length;
*cp++ = '(';
const jschar *message_chars = message->getChars(cx);
if (!message_chars)
return false;
if (message_length != 0) {
js_strncpy(cp, message_chars, message_length);
cp += message_length;
}
if (filename_length != 0) {
/* append filename as ``, {filename}'' */
*cp++ = ','; *cp++ = ' ';
const jschar *filename_chars = filename->getChars(cx);
if (!filename_chars)
return false;
js_strncpy(cp, filename_chars, 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++ = ' ';
const jschar *lineno_chars = lineno_as_str->getChars(cx);
if (!lineno_chars)
return false;
js_strncpy(cp, lineno_chars, lineno_length);
cp += lineno_length;
}
*cp++ = ')'; *cp++ = ')'; *cp = 0;
result = js_NewString(cx, chars, length);
if (!result) {
cx->free_(chars);
return false;
}
vp->setString(result);
return true;
}
}
#endif
static JSFunctionSpec exception_methods[] = {
#if JS_HAS_TOSOURCE
JS_FN(js_toSource_str, exn_toSource, 0,0),
#endif
JS_FN(js_toString_str, exn_toString, 0,0),
JS_FS_END
};
/* JSProto_ ordering for exceptions shall match JSEXN_ constants. */
JS_STATIC_ASSERT(JSEXN_ERR == 0);
JS_STATIC_ASSERT(JSProto_Error + JSEXN_INTERNALERR == JSProto_InternalError);
JS_STATIC_ASSERT(JSProto_Error + JSEXN_EVALERR == JSProto_EvalError);
JS_STATIC_ASSERT(JSProto_Error + JSEXN_RANGEERR == JSProto_RangeError);
JS_STATIC_ASSERT(JSProto_Error + JSEXN_REFERENCEERR == JSProto_ReferenceError);
JS_STATIC_ASSERT(JSProto_Error + JSEXN_SYNTAXERR == JSProto_SyntaxError);
JS_STATIC_ASSERT(JSProto_Error + JSEXN_TYPEERR == JSProto_TypeError);
JS_STATIC_ASSERT(JSProto_Error + JSEXN_URIERR == JSProto_URIError);
static JS_INLINE JSProtoKey
GetExceptionProtoKey(intN exn)
{
JS_ASSERT(JSEXN_ERR <= exn);
JS_ASSERT(exn < JSEXN_LIMIT);