/
jsexn.cpp
1288 lines (1112 loc) · 40.2 KB
/
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 "mozilla/Util.h"
#include "jstypes.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 "jsinterp.h"
#include "jsnum.h"
#include "jsobj.h"
#include "jsopcode.h"
#include "jsscope.h"
#include "jsscript.h"
#include "jswrapper.h"
#include "gc/Marking.h"
#include "vm/GlobalObject.h"
#include "vm/StringBuffer.h"
#include "jsinferinlines.h"
#include "jsobjinlines.h"
#include "vm/Stack-inl.h"
#include "vm/String-inl.h"
using namespace mozilla;
using namespace js;
using namespace js::gc;
using namespace js::types;
/* Forward declarations for ErrorClass's initializer. */
static JSBool
Exception(JSContext *cx, unsigned argc, Value *vp);
static void
exn_trace(JSTracer *trc, JSObject *obj);
static void
exn_finalize(FreeOp *fop, JSObject *obj);
static JSBool
exn_resolve(JSContext *cx, JSObject *obj, jsid id, unsigned flags,
JSObject **objp);
Class js::ErrorClass = {
js_Error_str,
JSCLASS_HAS_PRIVATE | JSCLASS_IMPLEMENTS_BARRIERS | JSCLASS_NEW_RESOLVE |
JSCLASS_HAS_CACHED_PROTO(JSProto_Error),
JS_PropertyStub, /* addProperty */
JS_PropertyStub, /* delProperty */
JS_PropertyStub, /* getProperty */
JS_StrictPropertyStub, /* setProperty */
JS_EnumerateStub,
(JSResolveOp)exn_resolve,
JS_ConvertStub,
exn_finalize,
NULL, /* checkAccess */
NULL, /* call */
NULL, /* construct */
NULL, /* hasInstance */
exn_trace
};
template <typename T>
struct JSStackTraceElemImpl
{
T funName;
const char *filename;
unsigned ulineno;
};
typedef JSStackTraceElemImpl<HeapPtrString> JSStackTraceElem;
typedef JSStackTraceElemImpl<JSString *> JSStackTraceStackElem;
struct JSExnPrivate
{
/* A copy of the JSErrorReport originally generated. */
JSErrorReport *errorReport;
js::HeapPtrString message;
js::HeapPtrString filename;
unsigned lineno;
size_t stackDepth;
int exnType;
JSStackTraceElem stackElems[1];
};
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_t *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_t *)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]);
js_memcpy(cursor, report->messageArgs[i], argSize);
cursor += argSize;
}
copy->messageArgs[i] = NULL;
JS_ASSERT(cursor == (uint8_t *)copy->messageArgs[0] + argsCopySize);
}
if (report->ucmessage) {
copy->ucmessage = (const jschar *)cursor;
js_memcpy(cursor, report->ucmessage, ucmessageSize);
cursor += ucmessageSize;
}
if (report->uclinebuf) {
copy->uclinebuf = (const jschar *)cursor;
js_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;
js_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;
js_memcpy(cursor, report->filename, filenameSize);
}
JS_ASSERT(cursor + filenameSize == (uint8_t *)copy + mallocSize);
/* HOLD called by the destination error object. */
copy->originPrincipals = report->originPrincipals;
/* 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;
}
struct SuppressErrorsGuard
{
JSContext *cx;
JSErrorReporter prevReporter;
JSExceptionState *prevState;
SuppressErrorsGuard(JSContext *cx)
: cx(cx),
prevReporter(JS_SetErrorReporter(cx, NULL)),
prevState(JS_SaveExceptionState(cx))
{}
~SuppressErrorsGuard()
{
JS_RestoreExceptionState(cx, prevState);
JS_SetErrorReporter(cx, prevReporter);
}
};
static void
SetExnPrivate(JSContext *cx, JSObject *exnObject, JSExnPrivate *priv);
static bool
InitExnPrivate(JSContext *cx, HandleObject exnObject, HandleString message,
HandleString filename, unsigned lineno, JSErrorReport *report, int exnType)
{
JS_ASSERT(exnObject->isError());
JS_ASSERT(!exnObject->getPrivate());
JSCheckAccessOp checkAccess = cx->runtime->securityCallbacks->checkObjectAccess;
Vector<JSStackTraceStackElem> frames(cx);
{
SuppressErrorsGuard seg(cx);
for (ScriptFrameIter i(cx); !i.done(); ++i) {
StackFrame *fp = i.fp();
/*
* Ask the crystal CAPS ball whether we can see across compartments.
* NB: this means 'fp' may point to cross-compartment frames.
*/
if (checkAccess && i.isNonEvalFunctionFrame()) {
Value v = NullValue();
jsid callerid = ATOM_TO_JSID(cx->runtime->atomState.callerAtom);
if (!checkAccess(cx, i.callee(), callerid, JSACC_READ, &v))
break;
}
if (!frames.growBy(1))
return false;
JSStackTraceStackElem &frame = frames.back();
if (i.isNonEvalFunctionFrame())
frame.funName = fp->fun()->atom ? fp->fun()->atom : cx->runtime->emptyString;
else
frame.funName = NULL;
frame.filename = SaveScriptFilename(cx, i.script()->filename);
if (!frame.filename)
return false;
frame.ulineno = PCToLineNumber(i.script(), i.pc());
}
}
/* Do not need overflow check: the vm stack is already bigger. */
JS_STATIC_ASSERT(sizeof(JSStackTraceElem) <= sizeof(StackFrame));
size_t nbytes = offsetof(JSExnPrivate, stackElems) +
frames.length() * sizeof(JSStackTraceElem);
JSExnPrivate *priv = (JSExnPrivate *)cx->malloc_(nbytes);
if (!priv)
return false;
/* Initialize to zero so that write barriers don't witness undefined values. */
memset(priv, 0, nbytes);
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) {
cx->free_(priv);
return false;
}
} else {
priv->errorReport = NULL;
}
priv->message.init(message);
priv->filename.init(filename);
priv->lineno = lineno;
priv->stackDepth = frames.length();
priv->exnType = exnType;
for (size_t i = 0; i < frames.length(); ++i) {
priv->stackElems[i].funName.init(frames[i].funName);
priv->stackElems[i].filename = frames[i].filename;
priv->stackElems[i].ulineno = frames[i].ulineno;
}
SetExnPrivate(cx, exnObject, priv);
return true;
}
static inline JSExnPrivate *
GetExnPrivate(JSObject *obj)
{
JS_ASSERT(obj->isError());
return (JSExnPrivate *) obj->getPrivate();
}
static void
exn_trace(JSTracer *trc, JSObject *obj)
{
if (JSExnPrivate *priv = GetExnPrivate(obj)) {
if (priv->message)
MarkString(trc, &priv->message, "exception message");
if (priv->filename)
MarkString(trc, &priv->filename, "exception filename");
for (size_t i = 0; i != priv->stackDepth; ++i) {
JSStackTraceElem &elem = priv->stackElems[i];
if (elem.funName)
MarkString(trc, &elem.funName, "stack trace function name");
if (IS_GC_MARKING_TRACER(trc) && elem.filename)
MarkScriptFilename(trc->runtime, elem.filename);
}
}
}
/* NB: An error object's private must be set through this function. */
static void
SetExnPrivate(JSContext *cx, JSObject *exnObject, JSExnPrivate *priv)
{
JS_ASSERT(!exnObject->getPrivate());
JS_ASSERT(exnObject->isError());
if (JSErrorReport *report = priv->errorReport) {
if (JSPrincipals *prin = report->originPrincipals)
JS_HoldPrincipals(prin);
}
exnObject->setPrivate(priv);
}
static void
exn_finalize(FreeOp *fop, JSObject *obj)
{
if (JSExnPrivate *priv = GetExnPrivate(obj)) {
if (JSErrorReport *report = priv->errorReport) {
/* HOLD called by SetExnPrivate. */
if (JSPrincipals *prin = report->originPrincipals)
JS_DropPrincipals(fop->runtime(), prin);
fop->free_(report);
}
fop->free_(priv);
}
}
static JSBool
exn_resolve(JSContext *cx, JSObject *obj_, jsid id, unsigned flags,
JSObject **objp)
{
JSExnPrivate *priv;
JSString *str;
JSAtom *atom;
JSString *stack;
const char *prop;
jsval v;
unsigned attrs;
RootedVarObject obj(cx, obj_);
*objp = NULL;
priv = GetExnPrivate(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;
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->isError())
return NULL;
priv = GetExnPrivate(obj);
if (!priv)
return NULL;
return priv->errorReport;
}
static JSString *
StackTraceToString(JSContext *cx, JSExnPrivate *priv)
{
jschar *stackbuf;
size_t stacklen, stackmax;
JSStackTraceElem *elem, *endElem;
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 = RoundUpPow2(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
elem = priv->stackElems;
for (endElem = elem + priv->stackDepth; elem != endElem; elem++) {
if (elem->funName)
APPEND_STRING_TO_STACK(elem->funName);
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, unsigned argc, Value *vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
/*
* 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.
*/
Value protov;
if (!args.callee().getProperty(cx, cx->runtime->atomState.classPrototypeAtom, &protov))
return false;
if (!protov.isObject()) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_BAD_PROTOTYPE, "Error");
return false;
}
JSObject *errProto = &protov.toObject();
RootedVarObject obj(cx, NewObjectWithGivenProto(cx, &ErrorClass, errProto, NULL));
if (!obj)
return false;
/* Set the 'message' property. */
RootedVarString message(cx);
if (args.hasDefined(0)) {
message = ToString(cx, args[0]);
if (!message)
return false;
args[0].setString(message);
} else {
message = NULL;
}
/* Find the scripted caller. */
ScriptFrameIter iter(cx);
/* Set the 'fileName' property. */
RootedVarString filename(cx);
if (args.length() > 1) {
filename = ToString(cx, args[1]);
if (!filename)
return false;
args[1].setString(filename);
} else {
if (!iter.done()) {
filename = FilenameToString(cx, iter.script()->filename);
if (!filename)
return false;
} else {
filename = cx->runtime->emptyString;
}
}
/* Set the 'lineNumber' property. */
uint32_t lineno;
if (args.length() > 2) {
if (!ToUint32(cx, args[2], &lineno))
return false;
} else {
lineno = iter.done() ? 0 : PCToLineNumber(iter.script(), iter.pc());
}
int exnType = args.callee().toFunction()->getExtendedSlot(0).toInt32();
if (!InitExnPrivate(cx, obj, message, filename, lineno, NULL, exnType))
return false;
args.rval().setObject(*obj);
return true;
}
/* ES5 15.11.4.4 (NB: with subsequent errata). */
static JSBool
exn_toString(JSContext *cx, unsigned argc, Value *vp)
{
JS_CHECK_RECURSION(cx, return false);
CallArgs args = CallArgsFromVp(argc, vp);
/* Step 2. */
if (!args.thisv().isObject()) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_BAD_PROTOTYPE, "Error");
return false;
}
/* Step 1. */
JSObject &obj = args.thisv().toObject();
/* Step 3. */
Value nameVal;
if (!obj.getProperty(cx, cx->runtime->atomState.nameAtom, &nameVal))
return false;
/* Step 4. */
RootedVarString name(cx);
if (nameVal.isUndefined()) {
name = CLASS_ATOM(cx, Error);
} else {
name = ToString(cx, nameVal);
if (!name)
return false;
}
/* Step 5. */
Value msgVal;
if (!obj.getProperty(cx, cx->runtime->atomState.messageAtom, &msgVal))
return false;
/* Step 6. */
JSString *message;
if (msgVal.isUndefined()) {
message = cx->runtime->emptyString;
} else {
message = ToString(cx, msgVal);
if (!message)
return false;
}
/* Step 7. */
if (name->empty() && message->empty()) {
args.rval().setString(CLASS_ATOM(cx, Error));
return true;
}
/* Step 8. */
if (name->empty()) {
args.rval().setString(message);
return true;
}
/* Step 9. */
if (message->empty()) {
args.rval().setString(name);
return true;
}
/* Step 10. */
StringBuffer sb(cx);
if (!sb.append(name) || !sb.append(": ") || !sb.append(message))
return false;
JSString *str = sb.finishString();
if (!str)
return false;
args.rval().setString(str);
return true;
}
#if JS_HAS_TOSOURCE
/*
* Return a string that may eval to something similar to the original object.
*/
static JSBool
exn_toSource(JSContext *cx, unsigned argc, Value *vp)
{
JS_CHECK_RECURSION(cx, return false);
CallArgs args = CallArgsFromVp(argc, vp);
JSObject *obj = ToObject(cx, &args.thisv());
if (!obj)
return false;
Value nameVal;
JSString *name;
if (!obj->getProperty(cx, cx->runtime->atomState.nameAtom, &nameVal) ||
!(name = ToString(cx, nameVal)))
{
return false;
}
Value messageVal;
JSString *message;
if (!obj->getProperty(cx, cx->runtime->atomState.messageAtom, &messageVal) ||
!(message = js_ValueToSource(cx, messageVal)))
{
return false;
}
Value filenameVal;
JSString *filename;
if (!obj->getProperty(cx, cx->runtime->atomState.fileNameAtom, &filenameVal) ||
!(filename = js_ValueToSource(cx, filenameVal)))
{
return false;
}
Value linenoVal;
uint32_t lineno;
if (!obj->getProperty(cx, cx->runtime->atomState.lineNumberAtom, &linenoVal) ||
!ToUint32(cx, linenoVal, &lineno))
{
return false;
}
StringBuffer sb(cx);
if (!sb.append("(new ") || !sb.append(name) || !sb.append("("))
return false;
if (!sb.append(message))
return false;
if (!filename->empty()) {
if (!sb.append(", ") || !sb.append(filename))
return false;
}
if (lineno != 0) {
/* We have a line, but no filename, add empty string */
if (filename->empty() && !sb.append(", \"\""))
return false;
JSString *linenumber = ToString(cx, linenoVal);
if (!linenumber)
return false;
if (!sb.append(", ") || !sb.append(linenumber))
return false;
}
if (!sb.append("))"))
return false;
JSString *str = sb.finishString();
if (!str)
return false;
args.rval().setString(str);
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 JSObject *
InitErrorClass(JSContext *cx, Handle<GlobalObject*> global, int type, HandleObject proto)
{
JSProtoKey key = GetExceptionProtoKey(type);
RootedVarAtom name(cx, cx->runtime->atomState.classAtoms[key]);
RootedVarObject errorProto(cx, global->createBlankPrototypeInheriting(cx, &ErrorClass, *proto));
if (!errorProto)
return NULL;
RootedVarValue empty(cx, StringValue(cx->runtime->emptyString));
RootedVarId nameId(cx, ATOM_TO_JSID(cx->runtime->atomState.nameAtom));
RootedVarId messageId(cx, ATOM_TO_JSID(cx->runtime->atomState.messageAtom));
RootedVarId fileNameId(cx, ATOM_TO_JSID(cx->runtime->atomState.fileNameAtom));
RootedVarId lineNumberId(cx, ATOM_TO_JSID(cx->runtime->atomState.lineNumberAtom));
if (!DefineNativeProperty(cx, errorProto, nameId, StringValue(name),
JS_PropertyStub, JS_StrictPropertyStub, 0, 0, 0) ||
!DefineNativeProperty(cx, errorProto, messageId, empty,
JS_PropertyStub, JS_StrictPropertyStub, 0, 0, 0) ||
!DefineNativeProperty(cx, errorProto, fileNameId, empty,
JS_PropertyStub, JS_StrictPropertyStub, JSPROP_ENUMERATE, 0, 0) ||
!DefineNativeProperty(cx, errorProto, lineNumberId, Int32Value(0),
JS_PropertyStub, JS_StrictPropertyStub, JSPROP_ENUMERATE, 0, 0))
{
return NULL;
}
/* Create the corresponding constructor. */
RootedVarFunction ctor(cx);
ctor = global->createConstructor(cx, Exception, name, 1,
JSFunction::ExtendedFinalizeKind);
if (!ctor)
return NULL;
ctor->setExtendedSlot(0, Int32Value(int32_t(type)));
if (!LinkConstructorAndPrototype(cx, ctor, errorProto))
return NULL;
if (!DefineConstructorAndPrototype(cx, global, key, ctor, errorProto))
return NULL;
JS_ASSERT(!errorProto->getPrivate());
return errorProto;
}
JSObject *
js_InitExceptionClasses(JSContext *cx, JSObject *obj)
{
JS_ASSERT(obj->isGlobal());
JS_ASSERT(obj->isNative());
RootedVar<GlobalObject*> global(cx, &obj->asGlobal());
RootedVarObject objectProto(cx, global->getOrCreateObjectPrototype(cx));
if (!objectProto)
return NULL;
/* Initialize the base Error class first. */
RootedVarObject errorProto(cx);
errorProto = InitErrorClass(cx, global, JSEXN_ERR, objectProto);
if (!errorProto)
return NULL;
/* |Error.prototype| alone has method properties. */
if (!DefinePropertiesAndBrand(cx, errorProto, NULL, exception_methods))
return NULL;
/* Define all remaining *Error constructors. */
for (int i = JSEXN_ERR + 1; i < JSEXN_LIMIT; i++) {
if (!InitErrorClass(cx, global, i, errorProto))
return NULL;
}
return errorProto;
}
const JSErrorFormatString*
js_GetLocalizedErrorMessage(JSContext* cx, void *userRef, const char *locale,
const unsigned 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;
}
namespace js {
JS_FRIEND_API(const jschar*)
GetErrorTypeNameFromNumber(JSContext* cx, const unsigned errorNumber)
{
const JSErrorFormatString *efs = js_GetErrorMessage(NULL, NULL, errorNumber);
/*
* JSEXN_INTERNALERR returns null to prevent that "InternalError: "
* is prepended before "uncaught exception: "
*/
if (!efs || efs->exnType <= JSEXN_NONE || efs->exnType >= JSEXN_LIMIT ||
efs->exnType == JSEXN_INTERNALERR)
{
return NULL;
}
JSProtoKey key = GetExceptionProtoKey(efs->exnType);
return cx->runtime->atomState.classAtoms[key]->chars();
}
} /* namespace js */
#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 */
struct AutoSetGeneratingError
{
JSContext *cx;
AutoSetGeneratingError(JSContext *cx)
: cx(cx)
{
JS_ASSERT(!cx->generatingError);
cx->generatingError = true;
}