JSBool
js_GetClassPrototype(JSContext *cx, JSClass *clasp, JSObject **protop)
{
JSBool ok;
JSObject *ctor;
jsval pval;
JSProperty *prop;
*protop = NULL;
JS_LOCK(cx);
ok = FindConstructor(cx, clasp, &pval);
if (!ok || !JSVAL_IS_FUNCTION(pval))
goto out;
ctor = JSVAL_TO_OBJECT(pval);
if (!js_LookupProperty(cx, ctor,
(jsval)cx->runtime->atomState.classPrototypeAtom,
NULL, &prop)) {
ok = JS_FALSE;
goto out;
}
if (prop) {
pval = prop->object->slots[prop->slot];
if (JSVAL_IS_OBJECT(pval))
*protop = JSVAL_TO_OBJECT(pval);
}
out:
JS_UNLOCK(cx);
return ok;
}
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;
if (checkAccess) {
older = JS_SetErrorReporter(cx, NULL);
state = JS_SaveExceptionState(cx);
}
#ifdef __GNUC__ /* suppress bogus gcc warnings */
else {
older = NULL;
state = NULL;
}
#endif
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, fp->fun->object, callerid, JSACC_READ, &v);
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 (JSVAL_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);
} 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(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 (checkAccess) {
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);
}
JSProperty *
js_SetProperty(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
JSRuntime *rt;
JSScope *scope, *protoScope;
JSProperty *prop, *protoProp;
PRHashNumber hash;
JSSymbol *sym, *protoSym;
JSObject *proto, *assignobj;
jsval pval, aval, rval;
jsint slot;
JSErrorReporter older;
JSString *str;
rt = cx->runtime;
PR_ASSERT(JS_IS_RUNTIME_LOCKED(rt));
#ifdef SCOPE_TABLE_NOTYET
/* XXX hash recompute */
/* XXX protoProp->getter, protoProp->setter, protoProp->flags */
scope = js_MutateScope(cx, obj, id, getter, setter, flags, &prop);
#endif
scope = js_GetMutableScope(cx, obj);
if (!scope)
return NULL;
/* Handle old bug that treated empty string as zero index. */
CHECK_FOR_FUNNY_INDEX(id);
hash = js_HashValue(id);
sym = scope->ops->lookup(cx, scope, id, hash);
if (sym) {
prop = sym_property(sym);
#if JS_HAS_OBJ_WATCHPOINT
if (!prop) {
/*
* Deleted property place-holder, could have a watchpoint that
* holds the deleted-but-watched property.
*/
prop = js_FindWatchPoint(rt, obj, js_IdToValue(id));
}
#endif
} else {
prop = NULL;
}
if (!prop) {
/* Find a prototype property with the same id. */
proto = OBJ_GET_PROTO(obj);
protoProp = NULL;
while (proto) {
protoScope = (JSScope *)proto->map;
protoSym = protoScope->ops->lookup(cx, protoScope, id, hash);
if (protoSym) {
protoProp = sym_property(protoSym);
if (protoProp)
break;
}
proto = OBJ_GET_PROTO(proto);
}
/* Make a new property descriptor with the right heritage. */
if (protoProp) {
prop = js_NewProperty(cx, scope, id,
protoProp->getter, protoProp->setter,
protoProp->flags | JSPROP_ENUMERATE);
prop->id = protoProp->id;
} else {
prop = js_NewProperty(cx, scope, id,
scope->map.clasp->getProperty,
scope->map.clasp->setProperty,
JSPROP_ENUMERATE);
}
if (!prop)
return NULL;
if (!obj->map->clasp->addProperty(cx, obj, prop->id, vp)) {
js_DestroyProperty(cx, prop);
return NULL;
}
/* Initialize new properties to undefined. */
obj->slots[prop->slot] = JSVAL_VOID;
if (sym) {
/* Null-valued symbol left behind from a delete operation. */
sym->entry.value = js_HoldProperty(cx, prop);
}
}
if (!sym) {
/* Need a new symbol as well as a new property. */
sym = scope->ops->add(cx, scope, id, prop);
if (!sym)
return NULL;
#if JS_BUG_AUTO_INDEX_PROPS
{
jsval id2 = INT_TO_JSVAL(prop->slot - JSSLOT_START);
if (!scope->ops->add(cx, scope, id2, prop)) {
scope->ops->remove(cx, scope, id);
return NULL;
}
PROPERTY_CACHE_FILL(cx, &rt->propertyCache, obj, id2, prop);
}
#endif
PROPERTY_CACHE_FILL(cx, &rt->propertyCache, obj, id, prop);
}
/* Get the current property value from its slot. */
PR_ASSERT(prop->slot < obj->map->freeslot);
slot = prop->slot;
pval = obj->slots[slot];
/* Evil overloaded operator assign() hack. */
if (JSVAL_IS_OBJECT(pval)) {
assignobj = JSVAL_TO_OBJECT(pval);
if (assignobj) {
older = JS_SetErrorReporter(cx, NULL);
if (js_GetProperty(cx, assignobj, (jsval)rt->atomState.assignAtom,
&aval) &&
JSVAL_IS_FUNCTION(aval) &&
js_Call(cx, assignobj, aval, 1, vp, &rval)) {
*vp = rval;
JS_SetErrorReporter(cx, older);
prop->flags |= JSPROP_ASSIGNHACK;
return prop;
}
JS_SetErrorReporter(cx, older);
}
}
/* Check for readonly *after* the assign() hack. */
if (prop->flags & JSPROP_READONLY) {
if (!JSVERSION_IS_ECMA(cx->version)) {
str = js_ValueToSource(cx, js_IdToValue(id));
if (str) {
JS_ReportError(cx, "%s is read-only",
JS_GetStringBytes(str));
}
}
return NULL;
}
/* Let the setter modify vp before copying from it to obj->slots[slot]. */
if (!prop->setter(cx, obj, prop->id, vp))
return NULL;
GC_POKE(cx, pval);
obj->slots[slot] = *vp;
/* Setting a property makes it enumerable. */
prop->flags |= JSPROP_ENUMERATE;
return prop;
}
