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pjs/js/src/jsfun.c

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C
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU Public License (the "GPL"), in which case the
* provisions of the GPL are applicable instead of those above.
* If you wish to allow use of your version of this file only
* under the terms of the GPL and not to allow others to use your
* version of this file under the NPL, indicate your decision by
* deleting the provisions above and replace them with the notice
* and other provisions required by the GPL. If you do not delete
* the provisions above, a recipient may use your version of this
* file under either the NPL or the GPL.
*/
/*
* JS function support.
*/
#include "jsstddef.h"
#include <string.h>
#include "jstypes.h"
#include "jsbit.h"
#include "jsutil.h" /* Added by JSIFY */
#include "jsapi.h"
#include "jsarray.h"
#include "jsatom.h"
#include "jscntxt.h"
#include "jsconfig.h"
#include "jsfun.h"
#include "jsgc.h"
#include "jsinterp.h"
#include "jslock.h"
#include "jsnum.h"
#include "jsobj.h"
#include "jsopcode.h"
#include "jsparse.h"
#include "jsscan.h"
#include "jsscope.h"
#include "jsscript.h"
#include "jsstr.h"
#include "jsexn.h"
/* Generic function/call/arguments tinyids -- also reflected bit numbers. */
enum {
CALL_ARGUMENTS = -1, /* predefined arguments local variable */
CALL_CALLEE = -2, /* reference to active function's object */
ARGS_LENGTH = -3, /* number of actual args, arity if inactive */
ARGS_CALLEE = -4, /* reference from arguments to active funobj */
FUN_ARITY = -5, /* number of formal parameters; desired argc */
FUN_NAME = -6, /* function name, "" if anonymous */
FUN_CALLER = -7 /* Function.prototype.caller, backward compat */
};
#if JSFRAME_OVERRIDE_BITS < 8
# error "not enough override bits in JSStackFrame.flags!"
#endif
#define TEST_OVERRIDE_BIT(fp, tinyid) \
((fp)->flags & JS_BIT(JSFRAME_OVERRIDE_SHIFT - ((tinyid) + 1)))
#define SET_OVERRIDE_BIT(fp, tinyid) \
((fp)->flags |= JS_BIT(JSFRAME_OVERRIDE_SHIFT - ((tinyid) + 1)))
#if JS_HAS_ARGS_OBJECT
JSBool
js_GetArgsValue(JSContext *cx, JSStackFrame *fp, jsval *vp)
{
JSObject *argsobj;
if (TEST_OVERRIDE_BIT(fp, CALL_ARGUMENTS)) {
JS_ASSERT(fp->callobj);
return OBJ_GET_PROPERTY(cx, fp->callobj,
(jsid) cx->runtime->atomState.argumentsAtom,
vp);
}
argsobj = js_GetArgsObject(cx, fp);
if (!argsobj)
return JS_FALSE;
*vp = OBJECT_TO_JSVAL(argsobj);
return JS_TRUE;
}
static JSBool
MarkArgDeleted(JSContext *cx, JSStackFrame *fp, uintN slot)
{
JSObject *argsobj;
jsval bmapval, bmapint;
size_t nbits, nbytes;
jsbitmap *bitmap;
argsobj = fp->argsobj;
(void) JS_GetReservedSlot(cx, argsobj, 0, &bmapval);
nbits = JS_MAX(fp->argc, fp->fun->nargs);
JS_ASSERT(slot < nbits);
if (JSVAL_IS_VOID(bmapval)) {
if (nbits <= JSVAL_INT_BITS) {
bmapint = 0;
bitmap = (jsbitmap *) &bmapint;
} else {
nbytes = JS_HOWMANY(nbits, JS_BITS_PER_WORD) * sizeof(jsbitmap);
bitmap = (jsbitmap *) JS_malloc(cx, nbytes);
if (!bitmap)
return JS_FALSE;
memset(bitmap, 0, nbytes);
bmapval = PRIVATE_TO_JSVAL(bitmap);
JS_SetReservedSlot(cx, argsobj, 0, bmapval);
}
} else {
if (nbits <= JSVAL_INT_BITS) {
bmapint = JSVAL_TO_INT(bmapval);
bitmap = (jsbitmap *) &bmapint;
} else {
bitmap = (jsbitmap *) JSVAL_TO_PRIVATE(bmapval);
}
}
JS_SET_BIT(bitmap, slot);
if (bitmap == (jsbitmap *) &bmapint) {
bmapval = INT_TO_JSVAL(bmapint);
JS_SetReservedSlot(cx, argsobj, 0, bmapval);
}
return JS_TRUE;
}
/* NB: Infallible predicate, false does not mean error/exception. */
static JSBool
ArgWasDeleted(JSContext *cx, JSStackFrame *fp, uintN slot)
{
JSObject *argsobj;
jsval bmapval, bmapint;
jsbitmap *bitmap;
argsobj = fp->argsobj;
(void) JS_GetReservedSlot(cx, argsobj, 0, &bmapval);
if (JSVAL_IS_VOID(bmapval))
return JS_FALSE;
if (JS_MAX(fp->argc, fp->fun->nargs) <= JSVAL_INT_BITS) {
bmapint = JSVAL_TO_INT(bmapval);
bitmap = (jsbitmap *) &bmapint;
} else {
bitmap = (jsbitmap *) JSVAL_TO_PRIVATE(bmapval);
}
return JS_TEST_BIT(bitmap, slot) != 0;
}
JSBool
js_GetArgsProperty(JSContext *cx, JSStackFrame *fp, jsid id,
JSObject **objp, jsval *vp)
{
jsval val;
JSObject *obj;
uintN slot;
if (TEST_OVERRIDE_BIT(fp, CALL_ARGUMENTS)) {
JS_ASSERT(fp->callobj);
if (!OBJ_GET_PROPERTY(cx, fp->callobj,
(jsid) cx->runtime->atomState.argumentsAtom,
&val)) {
return JS_FALSE;
}
if (JSVAL_IS_PRIMITIVE(val)) {
obj = js_ValueToNonNullObject(cx, val);
if (!obj)
return JS_FALSE;
} else {
obj = JSVAL_TO_OBJECT(val);
}
*objp = obj;
return OBJ_GET_PROPERTY(cx, obj, id, vp);
}
*objp = NULL;
*vp = JSVAL_VOID;
if (JSVAL_IS_INT(id)) {
slot = (uintN) JSVAL_TO_INT(id);
if (slot < JS_MAX(fp->argc, fp->fun->nargs)) {
if (fp->argsobj && ArgWasDeleted(cx, fp, slot))
return OBJ_GET_PROPERTY(cx, fp->argsobj, id, vp);
*vp = fp->argv[slot];
}
} else {
if (id == (jsid) cx->runtime->atomState.lengthAtom) {
if (fp->argsobj && TEST_OVERRIDE_BIT(fp, ARGS_LENGTH))
return OBJ_GET_PROPERTY(cx, fp->argsobj, id, vp);
*vp = INT_TO_JSVAL((jsint) fp->argc);
}
}
return JS_TRUE;
}
JSObject *
js_GetArgsObject(JSContext *cx, JSStackFrame *fp)
{
JSObject *argsobj;
/* Create an arguments object for fp only if it lacks one. */
JS_ASSERT(fp->fun);
argsobj = fp->argsobj;
if (argsobj)
return argsobj;
/* Link the new object to fp so it can get actual argument values. */
argsobj = js_NewObject(cx, &js_ArgumentsClass, NULL, NULL);
if (!argsobj || !JS_SetPrivate(cx, argsobj, fp)) {
cx->newborn[GCX_OBJECT] = NULL;
return NULL;
}
fp->argsobj = argsobj;
return argsobj;
}
static JSBool
args_enumerate(JSContext *cx, JSObject *obj);
JSBool
js_PutArgsObject(JSContext *cx, JSStackFrame *fp)
{
JSObject *argsobj;
jsval bmapval, rval;
JSBool ok;
JSRuntime *rt;
/*
* Reuse args_enumerate here to reflect fp's actual arguments as indexed
* elements of argsobj. Do this first, before clearing and freeing the
* deleted argument slot bitmap, because args_enumerate depends on that.
*/
argsobj = fp->argsobj;
ok = args_enumerate(cx, argsobj);
/*
* Now clear the deleted argument number bitmap slot and free the bitmap,
* if one was actually created due to 'delete arguments[0]' or similar.
*/
(void) JS_GetReservedSlot(cx, argsobj, 0, &bmapval);
if (!JSVAL_IS_VOID(bmapval)) {
JS_SetReservedSlot(cx, argsobj, 0, JSVAL_VOID);
if (JS_MAX(fp->argc, fp->fun->nargs) > JSVAL_INT_BITS)
JS_free(cx, JSVAL_TO_PRIVATE(bmapval));
}
/*
* Now get the prototype properties so we snapshot fp->fun and fp->argc
* before fp goes away.
*/
rt = cx->runtime;
ok &= js_GetProperty(cx, argsobj, (jsid)rt->atomState.calleeAtom, &rval);
ok &= js_SetProperty(cx, argsobj, (jsid)rt->atomState.calleeAtom, &rval);
ok &= js_GetProperty(cx, argsobj, (jsid)rt->atomState.lengthAtom, &rval);
ok &= js_SetProperty(cx, argsobj, (jsid)rt->atomState.lengthAtom, &rval);
/*
* Clear the private pointer to fp, which is about to go away (js_Invoke).
* Do this last because the args_enumerate and js_GetProperty calls above
* need to follow the private slot to find fp.
*/
ok &= JS_SetPrivate(cx, argsobj, NULL);
fp->argsobj = NULL;
return ok;
}
static JSBool
args_delProperty(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
jsint slot;
JSStackFrame *fp;
if (!JSVAL_IS_INT(id))
return JS_TRUE;
fp = (JSStackFrame *)
JS_GetInstancePrivate(cx, obj, &js_ArgumentsClass, NULL);
if (!fp)
return JS_TRUE;
JS_ASSERT(fp->argsobj);
JS_ASSERT(fp->fun);
slot = JSVAL_TO_INT(id);
switch (slot) {
case ARGS_CALLEE:
case ARGS_LENGTH:
SET_OVERRIDE_BIT(fp, slot);
break;
default:
if ((uintN)slot < JS_MAX(fp->argc, fp->fun->nargs) &&
!MarkArgDeleted(cx, fp, slot)) {
return JS_FALSE;
}
break;
}
return JS_TRUE;
}
static JSBool
args_getProperty(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
jsint slot;
JSStackFrame *fp;
if (!JSVAL_IS_INT(id))
return JS_TRUE;
fp = (JSStackFrame *)
JS_GetInstancePrivate(cx, obj, &js_ArgumentsClass, NULL);
if (!fp)
return JS_TRUE;
JS_ASSERT(fp->argsobj);
JS_ASSERT(fp->fun);
slot = JSVAL_TO_INT(id);
switch (slot) {
case ARGS_CALLEE:
if (!TEST_OVERRIDE_BIT(fp, slot))
*vp = fp->argv ? fp->argv[-2] : OBJECT_TO_JSVAL(fp->fun->object);
break;
case ARGS_LENGTH:
if (!TEST_OVERRIDE_BIT(fp, slot))
*vp = INT_TO_JSVAL((jsint)fp->argc);
break;
default:
if ((uintN)slot < JS_MAX(fp->argc, fp->fun->nargs) &&
!ArgWasDeleted(cx, fp, slot)) {
*vp = fp->argv[slot];
}
break;
}
return JS_TRUE;
}
static JSBool
args_setProperty(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
JSStackFrame *fp;
jsint slot;
if (!JSVAL_IS_INT(id))
return JS_TRUE;
fp = (JSStackFrame *)
JS_GetInstancePrivate(cx, obj, &js_ArgumentsClass, NULL);
if (!fp)
return JS_TRUE;
JS_ASSERT(fp->argsobj);
JS_ASSERT(fp->fun);
slot = JSVAL_TO_INT(id);
switch (slot) {
case ARGS_CALLEE:
case ARGS_LENGTH:
SET_OVERRIDE_BIT(fp, slot);
break;
default:
if ((uintN)slot < JS_MAX(fp->argc, fp->fun->nargs) &&
!ArgWasDeleted(cx, fp, slot)) {
fp->argv[slot] = *vp;
}
break;
}
return JS_TRUE;
}
static JSBool
args_resolve(JSContext *cx, JSObject *obj, jsval id, uintN flags,
JSObject **objp)
{
JSStackFrame *fp;
uintN slot;
JSString *str;
JSAtom *atom;
intN tinyid;
jsval value;
*objp = NULL;
fp = (JSStackFrame *)
JS_GetInstancePrivate(cx, obj, &js_ArgumentsClass, NULL);
if (!fp)
return JS_TRUE;
JS_ASSERT(fp->argsobj);
JS_ASSERT(fp->fun);
if (JSVAL_IS_INT(id)) {
slot = JSVAL_TO_INT(id);
if (slot < JS_MAX(fp->argc, fp->fun->nargs) &&
!ArgWasDeleted(cx, fp, slot)) {
/* XXX ECMA specs DontEnum, contrary to other array-like objects */
if (!js_DefineProperty(cx, obj, (jsid) id, fp->argv[slot],
args_getProperty, args_setProperty,
JSVERSION_IS_ECMA(cx->version)
? 0
: JSPROP_ENUMERATE,
NULL)) {
return JS_FALSE;
}
*objp = obj;
}
} else {
str = JSVAL_TO_STRING(id);
atom = cx->runtime->atomState.lengthAtom;
if (str == ATOM_TO_STRING(atom)) {
tinyid = ARGS_LENGTH;
value = INT_TO_JSVAL(fp->argc);
} else {
atom = cx->runtime->atomState.calleeAtom;
if (str == ATOM_TO_STRING(atom)) {
tinyid = ARGS_CALLEE;
value = fp->argv ? fp->argv[-2]
: OBJECT_TO_JSVAL(fp->fun->object);
} else {
atom = NULL;
/* Quell GCC overwarnings. */
tinyid = 0;
value = JSVAL_NULL;
}
}
if (atom && !TEST_OVERRIDE_BIT(fp, tinyid)) {
if (!js_DefineNativeProperty(cx, obj, (jsid) atom, value,
args_getProperty, args_setProperty, 0,
SPROP_HAS_SHORTID, tinyid, NULL)) {
return JS_FALSE;
}
*objp = obj;
}
}
return JS_TRUE;
}
static JSBool
args_enumerate(JSContext *cx, JSObject *obj)
{
JSStackFrame *fp;
JSObject *pobj;
JSProperty *prop;
uintN slot, nargs;
fp = (JSStackFrame *)
JS_GetInstancePrivate(cx, obj, &js_ArgumentsClass, NULL);
if (!fp)
return JS_TRUE;
JS_ASSERT(fp->argsobj);
JS_ASSERT(fp->fun);
/*
* Trigger reflection with value snapshot in args_resolve using a series
* of js_LookupProperty calls. We handle length, callee, and the indexed
* argument properties. We know that args_resolve covers all these cases
* and creates direct properties of obj, but that it may fail to resolve
* length or callee if overridden.
*/
if (!js_LookupProperty(cx, obj, (jsid) cx->runtime->atomState.lengthAtom,
&pobj, &prop)) {
return JS_FALSE;
}
if (prop)
OBJ_DROP_PROPERTY(cx, pobj, prop);
if (!js_LookupProperty(cx, obj, (jsid) cx->runtime->atomState.calleeAtom,
&pobj, &prop)) {
return JS_FALSE;
}
if (prop)
OBJ_DROP_PROPERTY(cx, pobj, prop);
nargs = JS_MAX(fp->argc, fp->fun->nargs);
for (slot = 0; slot < nargs; slot++) {
if (!js_LookupProperty(cx, obj, (jsid) INT_TO_JSVAL((jsint)slot),
&pobj, &prop)) {
return JS_FALSE;
}
if (prop)
OBJ_DROP_PROPERTY(cx, pobj, prop);
}
return JS_TRUE;
}
/*
* The Arguments class is not initialized via JS_InitClass, and must not be,
* because its name is "Object". Per ECMA, that causes instances of it to
* delegate to the object named by Object.prototype. It also ensures that
* arguments.toString() returns "[object Object]".
*
* The JSClass functions below collaborate to lazily reflect and synchronize
* actual argument values, argument count, and callee function object stored
* in a JSStackFrame with their corresponding property values in the frame's
* arguments object.
*/
JSClass js_ArgumentsClass = {
js_Object_str,
JSCLASS_HAS_PRIVATE | JSCLASS_NEW_RESOLVE | JSCLASS_HAS_RESERVED_SLOTS(1),
JS_PropertyStub, args_delProperty,
args_getProperty, args_setProperty,
args_enumerate, (JSResolveOp) args_resolve,
JS_ConvertStub, JS_FinalizeStub,
JSCLASS_NO_OPTIONAL_MEMBERS
};
#endif /* JS_HAS_ARGS_OBJECT */
#if JS_HAS_CALL_OBJECT
JSObject *
js_GetCallObject(JSContext *cx, JSStackFrame *fp, JSObject *parent)
{
JSObject *callobj, *funobj;
/* Create a call object for fp only if it lacks one. */
JS_ASSERT(fp->fun);
callobj = fp->callobj;
if (callobj)
return callobj;
JS_ASSERT(fp->fun);
/* The default call parent is its function's parent (static link). */
if (!parent) {
funobj = fp->argv ? JSVAL_TO_OBJECT(fp->argv[-2]) : fp->fun->object;
if (funobj)
parent = OBJ_GET_PARENT(cx, funobj);
}
/* Create the call object and link it to its stack frame. */
callobj = js_NewObject(cx, &js_CallClass, NULL, parent);
if (!callobj || !JS_SetPrivate(cx, callobj, fp)) {
cx->newborn[GCX_OBJECT] = NULL;
return NULL;
}
fp->callobj = callobj;
/* Make callobj be the scope chain and the variables object. */
fp->scopeChain = callobj;
fp->varobj = callobj;
return callobj;
}
static JSBool
call_enumerate(JSContext *cx, JSObject *obj);
JSBool
js_PutCallObject(JSContext *cx, JSStackFrame *fp)
{
JSObject *callobj;
JSBool ok;
jsid argsid;
jsval aval;
/*
* Reuse call_enumerate here to reflect all actual args and vars into the
* call object from fp.
*/
callobj = fp->callobj;
if (!callobj)
return JS_TRUE;
ok = call_enumerate(cx, callobj);
/*
* Get the arguments object to snapshot fp's actual argument values.
*/
if (fp->argsobj) {
argsid = (jsid) cx->runtime->atomState.argumentsAtom;
ok &= js_GetProperty(cx, callobj, argsid, &aval);
ok &= js_SetProperty(cx, callobj, argsid, &aval);
ok &= js_PutArgsObject(cx, fp);
}
/*
* Clear the private pointer to fp, which is about to go away (js_Invoke).
* Do this last because the call_enumerate and js_GetProperty calls above
* need to follow the private slot to find fp.
*/
ok &= JS_SetPrivate(cx, callobj, NULL);
fp->callobj = NULL;
return ok;
}
static JSPropertySpec call_props[] = {
{js_arguments_str, CALL_ARGUMENTS, JSPROP_PERMANENT,0,0},
{"__callee__", CALL_CALLEE, 0,0,0},
{0,0,0,0,0}
};
static JSBool
call_getProperty(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
JSStackFrame *fp;
jsint slot;
if (!JSVAL_IS_INT(id))
return JS_TRUE;
fp = (JSStackFrame *) JS_GetPrivate(cx, obj);
if (!fp)
return JS_TRUE;
JS_ASSERT(fp->fun);
slot = JSVAL_TO_INT(id);
switch (slot) {
case CALL_ARGUMENTS:
if (!TEST_OVERRIDE_BIT(fp, slot)) {
JSObject *argsobj = js_GetArgsObject(cx, fp);
if (!argsobj)
return JS_FALSE;
*vp = OBJECT_TO_JSVAL(argsobj);
}
break;
case CALL_CALLEE:
if (!TEST_OVERRIDE_BIT(fp, slot))
*vp = fp->argv ? fp->argv[-2] : OBJECT_TO_JSVAL(fp->fun->object);
break;
default:
if ((uintN)slot < JS_MAX(fp->argc, fp->fun->nargs))
*vp = fp->argv[slot];
break;
}
return JS_TRUE;
}
static JSBool
call_setProperty(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
JSStackFrame *fp;
jsint slot;
if (!JSVAL_IS_INT(id))
return JS_TRUE;
fp = (JSStackFrame *) JS_GetPrivate(cx, obj);
if (!fp)
return JS_TRUE;
JS_ASSERT(fp->fun);
slot = JSVAL_TO_INT(id);
switch (slot) {
case CALL_ARGUMENTS:
case CALL_CALLEE:
SET_OVERRIDE_BIT(fp, slot);
break;
default:
if ((uintN)slot < JS_MAX(fp->argc, fp->fun->nargs))
fp->argv[slot] = *vp;
break;
}
return JS_TRUE;
}
JSBool
js_GetCallVariable(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
JSStackFrame *fp;
JS_ASSERT(JSVAL_IS_INT(id));
fp = (JSStackFrame *) JS_GetPrivate(cx, obj);
if (fp) {
/* XXX no jsint slot commoning here to avoid MSVC1.52 crashes */
if ((uintN)JSVAL_TO_INT(id) < fp->nvars)
*vp = fp->vars[JSVAL_TO_INT(id)];
}
return JS_TRUE;
}
JSBool
js_SetCallVariable(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
JSStackFrame *fp;
JS_ASSERT(JSVAL_IS_INT(id));
fp = (JSStackFrame *) JS_GetPrivate(cx, obj);
if (fp) {
/* XXX jsint slot is block-local here to avoid MSVC1.52 crashes */
jsint slot = JSVAL_TO_INT(id);
if ((uintN)slot < fp->nvars)
fp->vars[slot] = *vp;
}
return JS_TRUE;
}
static JSBool
call_enumerate(JSContext *cx, JSObject *obj)
{
JSStackFrame *fp;
JSObject *funobj;
JSScope *scope;
JSScopeProperty *sprop;
JSPropertyOp getter;
JSProperty *prop;
fp = (JSStackFrame *) JS_GetPrivate(cx, obj);
if (!fp)
return JS_TRUE;
/*
* Do not enumerate a cloned function object at fp->argv[-2], it may have
* gained its own (mutable) scope (e.g., a brutally-shared XUL script sets
* the clone's prototype property). We must enumerate the function object
* that was decorated with parameter and local variable properties by the
* compiler when the compiler created fp->fun, namely fp->fun->object.
*
* Contrast with call_resolve, where we prefer fp->argv[-2], because we'll
* use js_LookupProperty to find any overridden properties in that object,
* if it was a mutated clone; and if not, we will search its prototype,
* fp->fun->object, to find compiler-created params and locals.
*/
funobj = fp->fun->object;
if (!funobj)
return JS_TRUE;
/*
* Reflect actual args from fp->argv for formal parameters, and local vars
* and functions in fp->vars for declared variables and nested-at-top-level
* local functions.
*/
scope = OBJ_SCOPE(funobj);
for (sprop = SCOPE_LAST_PROP(scope); sprop; sprop = sprop->parent) {
getter = sprop->getter;
if (getter != js_GetArgument && getter != js_GetLocalVariable)
continue;
/* Trigger reflection in call_resolve by doing a lookup. */
if (!js_LookupProperty(cx, obj, sprop->id, &obj, &prop))
return JS_FALSE;
JS_ASSERT(obj && prop);
OBJ_DROP_PROPERTY(cx, obj, prop);
}
return JS_TRUE;
}
static JSBool
call_resolve(JSContext *cx, JSObject *obj, jsval id, uintN flags,
JSObject **objp)
{
JSStackFrame *fp;
JSObject *funobj;
JSString *str;
JSAtom *atom;
JSObject *obj2;
JSScopeProperty *sprop;
jsid propid;
JSPropertyOp getter, setter;
uintN attrs, slot, nslots, spflags;
jsval *vp, value;
intN shortid;
fp = (JSStackFrame *) JS_GetPrivate(cx, obj);
if (!fp)
return JS_TRUE;
JS_ASSERT(fp->fun);
if (!JSVAL_IS_STRING(id))
return JS_TRUE;
funobj = fp->argv ? JSVAL_TO_OBJECT(fp->argv[-2]) : fp->fun->object;
if (!funobj)
return JS_TRUE;
str = JSVAL_TO_STRING(id);
atom = js_AtomizeString(cx, str, 0);
if (!atom)
return JS_FALSE;
if (!js_LookupProperty(cx, funobj, (jsid)atom, &obj2,
(JSProperty **)&sprop)) {
return JS_FALSE;
}
if (sprop && OBJ_IS_NATIVE(obj2)) {
propid = sprop->id;
getter = sprop->getter;
attrs = sprop->attrs & ~JSPROP_SHARED;
slot = (uintN) sprop->shortid;
OBJ_DROP_PROPERTY(cx, obj2, (JSProperty *)sprop);
if (getter == js_GetArgument || getter == js_GetLocalVariable) {
if (getter == js_GetArgument) {
vp = fp->argv;
nslots = JS_MAX(fp->argc, fp->fun->nargs);
getter = setter = NULL;
} else {
vp = fp->vars;
nslots = fp->nvars;
getter = js_GetCallVariable;
setter = js_SetCallVariable;
}
if (slot < nslots) {
value = vp[slot];
spflags = SPROP_HAS_SHORTID;
shortid = (intN) slot;
} else {
value = JSVAL_VOID;
spflags = 0;
shortid = 0;
}
if (!js_DefineNativeProperty(cx, obj, propid, value,
getter, setter, attrs,
spflags, shortid, NULL)) {
return JS_FALSE;
}
*objp = obj;
}
}
return JS_TRUE;
}
static JSBool
call_convert(JSContext *cx, JSObject *obj, JSType type, jsval *vp)
{
JSStackFrame *fp;
if (type == JSTYPE_FUNCTION) {
fp = (JSStackFrame *) JS_GetPrivate(cx, obj);
if (fp) {
JS_ASSERT(fp->fun);
*vp = fp->argv ? fp->argv[-2] : OBJECT_TO_JSVAL(fp->fun->object);
}
}
return JS_TRUE;
}
JSClass js_CallClass = {
js_Call_str,
JSCLASS_HAS_PRIVATE | JSCLASS_NEW_RESOLVE,
JS_PropertyStub, JS_PropertyStub,
call_getProperty, call_setProperty,
call_enumerate, (JSResolveOp)call_resolve,
call_convert, JS_FinalizeStub,
JSCLASS_NO_OPTIONAL_MEMBERS
};
#endif /* JS_HAS_CALL_OBJECT */
/* SHARED because fun_getProperty always computes a new value. */
#define FUNCTION_PROP_ATTRS (JSPROP_READONLY|JSPROP_PERMANENT|JSPROP_SHARED)
static JSPropertySpec function_props[] = {
{js_arguments_str, CALL_ARGUMENTS, FUNCTION_PROP_ATTRS,0,0},
{js_arity_str, FUN_ARITY, FUNCTION_PROP_ATTRS,0,0},
{js_length_str, ARGS_LENGTH, FUNCTION_PROP_ATTRS,0,0},
{js_name_str, FUN_NAME, FUNCTION_PROP_ATTRS,0,0},
{js_caller_str, FUN_CALLER, FUNCTION_PROP_ATTRS,0,0},
{0,0,0,0,0}
};
static JSBool
fun_getProperty(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
jsint slot;
JSFunction *fun;
JSStackFrame *fp;
#if defined XP_PC && defined _MSC_VER &&_MSC_VER <= 800
/* MSVC1.5 coredumps */
jsval bogus = *vp;
#endif
if (!JSVAL_IS_INT(id))
return JS_TRUE;
slot = JSVAL_TO_INT(id);
/* No valid function object should lack private data, but check anyway. */
fun = (JSFunction *)JS_GetInstancePrivate(cx, obj, &js_FunctionClass, NULL);
if (!fun)
return JS_TRUE;
/* Find fun's top-most activation record. */
for (fp = cx->fp; fp && (fp->fun != fun || (fp->flags & JSFRAME_SPECIAL));
fp = fp->down) {
continue;
}
switch (slot) {
case CALL_ARGUMENTS:
#if JS_HAS_ARGS_OBJECT
/* Warn if strict about f.arguments or equivalent unqualified uses. */
if (!JS_ReportErrorFlagsAndNumber(cx,
JSREPORT_WARNING | JSREPORT_STRICT,
js_GetErrorMessage, NULL,
JSMSG_DEPRECATED_USAGE,
js_arguments_str)) {
return JS_FALSE;
}
if (fp) {
if (!js_GetArgsValue(cx, fp, vp))
return JS_FALSE;
} else {
*vp = JSVAL_NULL;
}
break;
#else /* !JS_HAS_ARGS_OBJECT */
*vp = OBJECT_TO_JSVAL(fp ? obj : NULL);
break;
#endif /* !JS_HAS_ARGS_OBJECT */
case ARGS_LENGTH:
if (!JSVERSION_IS_ECMA(cx->version))
*vp = INT_TO_JSVAL((jsint)(fp && fp->fun ? fp->argc : fun->nargs));
else
case FUN_ARITY:
*vp = INT_TO_JSVAL((jsint)fun->nargs);
break;
case FUN_NAME:
*vp = fun->atom
? ATOM_KEY(fun->atom)
: STRING_TO_JSVAL(cx->runtime->emptyString);
break;
case FUN_CALLER:
if (fp && fp->down && fp->down->fun && fp->down->argv)
*vp = fp->down->argv[-2];
else
*vp = JSVAL_NULL;
if (cx->runtime->checkObjectAccess) {
id = ATOM_KEY(cx->runtime->atomState.callerAtom);
if (!cx->runtime->checkObjectAccess(cx, obj, id, JSACC_READ, vp))
return JS_FALSE;
}
break;
default:
/* XXX fun[0] and fun.arguments[0] are equivalent. */
if (fp && fp->fun && (uintN)slot < fp->fun->nargs)
#if defined XP_PC && defined _MSC_VER &&_MSC_VER <= 800
/* MSVC1.5 coredumps */
if (bogus == *vp)
#endif
*vp = fp->argv[slot];
break;
}
return JS_TRUE;
}
static JSBool
fun_resolve(JSContext *cx, JSObject *obj, jsval id, uintN flags,
JSObject **objp)
{
JSFunction *fun;
JSString *str;
JSAtom *prototypeAtom;
if (!JSVAL_IS_STRING(id))
return JS_TRUE;
/* No valid function object should lack private data, but check anyway. */
fun = (JSFunction *)JS_GetInstancePrivate(cx, obj, &js_FunctionClass, NULL);
if (!fun || !fun->object)
return JS_TRUE;
/* No need to reflect fun.prototype in 'fun.prototype = ...'. */
if (flags & JSRESOLVE_ASSIGNING)
return JS_TRUE;
/*
* Ok, check whether id is 'prototype' and bootstrap the function object's
* prototype property.
*/
str = JSVAL_TO_STRING(id);
prototypeAtom = cx->runtime->atomState.classPrototypeAtom;
if (str == ATOM_TO_STRING(prototypeAtom)) {
JSObject *proto, *parentProto;
jsval pval;
proto = parentProto = NULL;
if (fun->object != obj && fun->object) {
/*
* Clone of a function: make its prototype property value have the
* same class as the clone-parent's prototype.
*/
if (!OBJ_GET_PROPERTY(cx, fun->object, (jsid)prototypeAtom, &pval))
return JS_FALSE;
if (JSVAL_IS_OBJECT(pval))
parentProto = JSVAL_TO_OBJECT(pval);
}
/*
* Beware of the wacky case of a user function named Object -- trying
* to find a prototype for that will recur back here ad perniciem.
*/
if (!parentProto && fun->atom == cx->runtime->atomState.ObjectAtom)
return JS_TRUE;
/*
* If resolving "prototype" in a clone, clone the parent's prototype.
* Pass the constructor's (obj's) parent as the prototype parent, to
* avoid defaulting to parentProto.constructor.__parent__.
*/
proto = js_NewObject(cx, &js_ObjectClass, parentProto,
OBJ_GET_PARENT(cx, obj));
if (!proto)
return JS_FALSE;
/*
* ECMA says that constructor.prototype is DontEnum | DontDelete for
* user-defined functions, but DontEnum | ReadOnly | DontDelete for
* native "system" constructors such as Object or Function. So lazily
* set the former here in fun_resolve, but eagerly define the latter
* in JS_InitClass, with the right attributes.
*/
if (!js_SetClassPrototype(cx, obj, proto, JSPROP_PERMANENT)) {
cx->newborn[GCX_OBJECT] = NULL;
return JS_FALSE;
}
*objp = obj;
}
return JS_TRUE;
}
static JSBool
fun_convert(JSContext *cx, JSObject *obj, JSType type, jsval *vp)
{
switch (type) {
case JSTYPE_FUNCTION:
*vp = OBJECT_TO_JSVAL(obj);
return JS_TRUE;
default:
return js_TryValueOf(cx, obj, type, vp);
}
}
static void
fun_finalize(JSContext *cx, JSObject *obj)
{
JSFunction *fun;
/* No valid function object should lack private data, but check anyway. */
fun = (JSFunction *) JS_GetPrivate(cx, obj);
if (!fun)
return;
if (fun->object == obj)
fun->object = NULL;
JS_ATOMIC_DECREMENT(&fun->nrefs);
if (fun->nrefs)
return;
if (fun->script)
js_DestroyScript(cx, fun->script);
JS_free(cx, fun);
}
#if JS_HAS_XDR
#include "jsxdrapi.h"
enum {
JSXDR_FUNARG = 1,
JSXDR_FUNVAR = 2,
JSXDR_FUNCONST = 3
};
/* XXX store parent and proto, if defined */
static JSBool
fun_xdrObject(JSXDRState *xdr, JSObject **objp)
{
JSContext *cx;
JSFunction *fun;
JSString *atomstr;
char *propname;
JSScopeProperty *sprop;
jsid userid;
JSAtom *atom;
uintN i, n, dupflag;
uint32 type;
#ifdef DEBUG
uintN nvars = 0, nargs = 0;
#endif
cx = xdr->cx;
if (xdr->mode == JSXDR_ENCODE) {
/*
* No valid function object should lack private data, but fail soft
* (return true, no error report) in case one does due to API pilot
* or internal error.
*/
fun = (JSFunction *) JS_GetPrivate(cx, *objp);
if (!fun)
return JS_TRUE;
atomstr = fun->atom ? ATOM_TO_STRING(fun->atom) : NULL;
} else {
fun = js_NewFunction(cx, NULL, NULL, 0, 0, NULL, NULL);
if (!fun)
return JS_FALSE;
atomstr = NULL;
}
if (!JS_XDRStringOrNull(xdr, &atomstr) ||
!JS_XDRUint16(xdr, &fun->nargs) ||
!JS_XDRUint16(xdr, &fun->extra) ||
!JS_XDRUint16(xdr, &fun->nvars) ||
!JS_XDRUint8(xdr, &fun->flags)) {
return JS_FALSE;
}
/* do arguments and local vars */
if (fun->object) {
n = fun->nargs + fun->nvars;
if (xdr->mode == JSXDR_ENCODE) {
JSScope *scope;
JSScopeProperty **spvec, *auto_spvec[8];
void *mark;
if (n <= sizeof auto_spvec / sizeof auto_spvec[0]) {
spvec = auto_spvec;
mark = NULL;
} else {
mark = JS_ARENA_MARK(&cx->tempPool);
JS_ARENA_ALLOCATE_CAST(spvec, JSScopeProperty **, &cx->tempPool,
n * sizeof(JSScopeProperty *));
if (!spvec) {
JS_ReportOutOfMemory(cx);
return JS_FALSE;
}
}
scope = OBJ_SCOPE(fun->object);
for (sprop = SCOPE_LAST_PROP(scope); sprop;
sprop = sprop->parent) {
if (sprop->getter == js_GetArgument) {
JS_ASSERT(nargs++ <= fun->nargs);
spvec[sprop->shortid] = sprop;
} else if (sprop->getter == js_GetLocalVariable) {
JS_ASSERT(nvars++ <= fun->nvars);
spvec[fun->nargs + sprop->shortid] = sprop;
}
}
for (i = 0; i < n; i++) {
sprop = spvec[i];
JS_ASSERT(sprop->flags & SPROP_HAS_SHORTID);
type = (i < fun->nargs)
? JSXDR_FUNARG
: (sprop->attrs & JSPROP_READONLY)
? JSXDR_FUNCONST
: JSXDR_FUNVAR;
userid = INT_TO_JSVAL(sprop->shortid);
propname = ATOM_BYTES((JSAtom *)sprop->id);
if (!JS_XDRUint32(xdr, &type) ||
!JS_XDRUint32(xdr, (uint32 *)&userid) ||
!JS_XDRCString(xdr, &propname)) {
if (mark)
JS_ARENA_RELEASE(&cx->tempPool, mark);
return JS_FALSE;
}
}
if (mark)
JS_ARENA_RELEASE(&cx->tempPool, mark);
} else {
JSPropertyOp getter, setter;
for (i = n; i != 0; i--) {
uintN attrs = JSPROP_ENUMERATE | JSPROP_PERMANENT;
if (!JS_XDRUint32(xdr, &type) ||
!JS_XDRUint32(xdr, (uint32 *)&userid) ||
!JS_XDRCString(xdr, &propname)) {
return JS_FALSE;
}
JS_ASSERT(type == JSXDR_FUNARG || type == JSXDR_FUNVAR ||
type == JSXDR_FUNCONST);
if (type == JSXDR_FUNARG) {
getter = js_GetArgument;
setter = js_SetArgument;
JS_ASSERT(nargs++ <= fun->nargs);
} else if (type == JSXDR_FUNVAR || type == JSXDR_FUNCONST) {
getter = js_GetLocalVariable;
setter = js_SetLocalVariable;
if (type == JSXDR_FUNCONST)
attrs |= JSPROP_READONLY;
JS_ASSERT(nvars++ <= fun->nvars);
} else {
getter = NULL;
setter = NULL;
}
atom = js_Atomize(cx, propname, strlen(propname), 0);
JS_free(cx, propname);
if (!atom)
return JS_FALSE;
/* Flag duplicate argument if atom is bound in fun->object. */
dupflag = SCOPE_GET_PROPERTY(OBJ_SCOPE(fun->object), (jsid)atom)
? SPROP_IS_DUPLICATE
: 0;
if (!js_AddNativeProperty(cx, fun->object, (jsid)atom,
getter, setter, SPROP_INVALID_SLOT,
attrs | JSPROP_SHARED,
SPROP_HAS_SHORTID | dupflag,
JSVAL_TO_INT(userid))) {
return JS_FALSE;
}
}
}
}
if (!js_XDRScript(xdr, &fun->script, NULL))
return JS_FALSE;
if (xdr->mode == JSXDR_DECODE) {
*objp = fun->object;
if (atomstr) {
fun->atom = js_AtomizeString(cx, atomstr, 0);
if (!fun->atom)
return JS_FALSE;
if (!OBJ_DEFINE_PROPERTY(cx, cx->globalObject,
(jsid)fun->atom, OBJECT_TO_JSVAL(*objp),
NULL, NULL, JSPROP_ENUMERATE,
NULL)) {
return JS_FALSE;
}
}
js_CallNewScriptHook(cx, fun->script, fun);
}
return JS_TRUE;
}
#else /* !JS_HAS_XDR */
#define fun_xdrObject NULL
#endif /* !JS_HAS_XDR */
#if JS_HAS_INSTANCEOF
/*
* [[HasInstance]] internal method for Function objects: fetch the .prototype
* property of its 'this' parameter, and walks the prototype chain of v (only
* if v is an object) returning true if .prototype is found.
*/
static JSBool
fun_hasInstance(JSContext *cx, JSObject *obj, jsval v, JSBool *bp)
{
jsval pval, cval;
JSString *str;
JSObject *proto, *obj2;
JSFunction *cfun, *ofun;
if (!OBJ_GET_PROPERTY(cx, obj,
(jsid)cx->runtime->atomState.classPrototypeAtom,
&pval)) {
return JS_FALSE;
}
if (JSVAL_IS_PRIMITIVE(pval)) {
/*
* Throw a runtime error if instanceof is called on a function that
* has a non-object as its .prototype value.
*/
str = js_DecompileValueGenerator(cx, -1, OBJECT_TO_JSVAL(obj), NULL);
if (str) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_BAD_PROTOTYPE, JS_GetStringBytes(str));
}
return JS_FALSE;
}
proto = JSVAL_TO_OBJECT(pval);
if (!js_IsDelegate(cx, proto, v, bp))
return JS_FALSE;
if (!*bp && !JSVAL_IS_PRIMITIVE(v)) {
/*
* Extension for "brutal sharing" of standard class constructors: if
* a script is compiled using a single, shared set of constructors, in
* particular Function and RegExp, but executed many times using other
* sets of standard constructors, then (/re/ instanceof RegExp), e.g.,
* will be false.
*
* We extend instanceof in this case to look for a matching native or
* script underlying the function object found in the 'constructor'
* property of the object in question (which is JSVAL_TO_OBJECT(v)),
* or found in the 'constructor' property of one of its prototypes.
*
* See also jsexn.c, where the *Error constructors are defined, each
* with its own native function, to satisfy (e instanceof Error) even
* when exceptions cross standard-class sharing boundaries. Note that
* Error.prototype may not lie on e's __proto__ chain in that case.
*/
obj2 = JSVAL_TO_OBJECT(v);
do {
if (!OBJ_GET_PROPERTY(cx, obj2,
(jsid)cx->runtime->atomState.constructorAtom,
&cval)) {
return JS_FALSE;
}
if (JSVAL_IS_FUNCTION(cx, cval)) {
cfun = (JSFunction *) JS_GetPrivate(cx, JSVAL_TO_OBJECT(cval));
ofun = (JSFunction *) JS_GetPrivate(cx, obj);
if (cfun->native == ofun->native &&
cfun->script == ofun->script) {
*bp = JS_TRUE;
break;
}
}
} while ((obj2 = OBJ_GET_PROTO(cx, obj2)) != NULL);
}
return JS_TRUE;
}
#else /* !JS_HAS_INSTANCEOF */
#define fun_hasInstance NULL
#endif /* !JS_HAS_INSTANCEOF */
static uint32
fun_mark(JSContext *cx, JSObject *obj, void *arg)
{
JSFunction *fun;
fun = (JSFunction *) JS_GetPrivate(cx, obj);
if (fun) {
if (fun->atom)
GC_MARK_ATOM(cx, fun->atom, arg);
if (fun->script)
js_MarkScript(cx, fun->script, arg);
}
return 0;
}
/*
* Reserve two slots in all function objects for XPConnect. Note that this
* does not bloat every instance, only those on which reserved slots are set,
* and those on which ad-hoc properties are defined.
*/
JSClass js_FunctionClass = {
js_Function_str,
JSCLASS_HAS_PRIVATE | JSCLASS_NEW_RESOLVE | JSCLASS_HAS_RESERVED_SLOTS(2),
JS_PropertyStub, JS_PropertyStub,
fun_getProperty, JS_PropertyStub,
JS_EnumerateStub, (JSResolveOp)fun_resolve,
fun_convert, fun_finalize,
NULL, NULL,
NULL, NULL,
fun_xdrObject, fun_hasInstance,
fun_mark, 0
};
static JSBool
fun_toString_sub(JSContext *cx, JSObject *obj, uint32 indent,
uintN argc, jsval *argv, jsval *rval)
{
jsval fval;
JSFunction *fun;
JSString *str;
fval = argv[-1];
if (!JSVAL_IS_FUNCTION(cx, fval)) {
/*
* If we don't have a function to start off with, try converting the
* object to a function. If that doesn't work, complain.
*/
if (JSVAL_IS_OBJECT(fval)) {
obj = JSVAL_TO_OBJECT(fval);
if (!OBJ_GET_CLASS(cx, obj)->convert(cx, obj, JSTYPE_FUNCTION,
&fval)) {
return JS_FALSE;
}
}
if (!JSVAL_IS_FUNCTION(cx, fval)) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_INCOMPATIBLE_PROTO,
js_Function_str, js_toString_str,
JS_GetTypeName(cx, JS_TypeOfValue(cx, fval)));
return JS_FALSE;
}
}
obj = JSVAL_TO_OBJECT(fval);
fun = (JSFunction *) JS_GetPrivate(cx, obj);
if (!fun)
return JS_TRUE;
if (argc && !js_ValueToECMAUint32(cx, argv[0], &indent))
return JS_FALSE;
str = JS_DecompileFunction(cx, fun, (uintN)indent);
if (!str)
return JS_FALSE;
*rval = STRING_TO_JSVAL(str);
return JS_TRUE;
}
static JSBool
fun_toString(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
return fun_toString_sub(cx, obj, 0, argc, argv, rval);
}
#if JS_HAS_TOSOURCE
static JSBool
fun_toSource(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
return fun_toString_sub(cx, obj, JS_DONT_PRETTY_PRINT, argc, argv, rval);
}
#endif
static const char js_call_str[] = "call";
#if JS_HAS_CALL_FUNCTION
static JSBool
fun_call(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
jsval fval, *sp, *oldsp;
void *mark;
uintN i;
JSStackFrame *fp;
JSBool ok;
if (!OBJ_DEFAULT_VALUE(cx, obj, JSTYPE_FUNCTION, &argv[-1]))
return JS_FALSE;
fval = argv[-1];
if (!JSVAL_IS_FUNCTION(cx, fval)) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_INCOMPATIBLE_PROTO,
js_Function_str, js_call_str,
JS_GetStringBytes(JS_ValueToString(cx, fval)));
return JS_FALSE;
}
if (argc == 0) {
/* Call fun with its parent as the 'this' parameter if no args. */
obj = OBJ_GET_PARENT(cx, obj);
} else {
/* Otherwise convert the first arg to 'this' and skip over it. */
if (!js_ValueToObject(cx, argv[0], &obj))
return JS_FALSE;
argc--;
argv++;
}
/* Allocate stack space for fval, obj, and the args. */
sp = js_AllocStack(cx, 2 + argc, &mark);
if (!sp)
return JS_FALSE;
/* Push fval, obj, and the args. */
*sp++ = fval;
*sp++ = OBJECT_TO_JSVAL(obj);
for (i = 0; i < argc; i++)
*sp++ = argv[i];
/* Lift current frame to include the args and do the call. */
fp = cx->fp;
oldsp = fp->sp;
fp->sp = sp;
ok = js_Invoke(cx, argc, JSINVOKE_INTERNAL);
/* Store rval and pop stack back to our frame's sp. */
*rval = fp->sp[-1];
fp->sp = oldsp;
js_FreeStack(cx, mark);
return ok;
}
#endif /* JS_HAS_CALL_FUNCTION */
#if JS_HAS_APPLY_FUNCTION
static JSBool
fun_apply(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
jsval fval, *sp, *oldsp;
JSObject *aobj;
jsuint length;
void *mark;
uintN i;
JSBool ok;
JSStackFrame *fp;
if (argc == 0) {
/* Will get globalObject as 'this' and no other agurments. */
return fun_call(cx, obj, argc, argv, rval);
}
if (!OBJ_DEFAULT_VALUE(cx, obj, JSTYPE_FUNCTION, &argv[-1]))
return JS_FALSE;
fval = argv[-1];
if (!JSVAL_IS_FUNCTION(cx, fval)) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_INCOMPATIBLE_PROTO,
js_Function_str, "apply",
JS_GetStringBytes(JS_ValueToString(cx, fval)));
return JS_FALSE;
}
/* Quell GCC overwarnings. */
aobj = NULL;
length = 0;
if (argc >= 2) {
/* If the 2nd arg is null or void, call the function with 0 args. */
if (JSVAL_IS_NULL(argv[1]) || JSVAL_IS_VOID(argv[1])) {
argc = 0;
} else {
/* The second arg must be an array (or arguments object). */
if (JSVAL_IS_PRIMITIVE(argv[1]) ||
(aobj = JSVAL_TO_OBJECT(argv[1]),
OBJ_GET_CLASS(cx, aobj) != &js_ArgumentsClass &&
OBJ_GET_CLASS(cx, aobj) != &js_ArrayClass))
{
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_BAD_APPLY_ARGS);
return JS_FALSE;
}
if (!js_GetLengthProperty(cx, aobj, &length))
return JS_FALSE;
}
}
/* Convert the first arg to 'this' and skip over it. */
if (!js_ValueToObject(cx, argv[0], &obj))
return JS_FALSE;
/* Allocate stack space for fval, obj, and the args. */
argc = (uintN)length;
sp = js_AllocStack(cx, 2 + argc, &mark);
if (!sp)
return JS_FALSE;
/* Push fval, obj, and aobj's elements as args. */
*sp++ = fval;
*sp++ = OBJECT_TO_JSVAL(obj);
for (i = 0; i < argc; i++) {
ok = JS_GetElement(cx, aobj, (jsint)i, sp);
if (!ok)
goto out;
sp++;
}
/* Lift current frame to include the args and do the call. */
fp = cx->fp;
oldsp = fp->sp;
fp->sp = sp;
ok = js_Invoke(cx, argc, JSINVOKE_INTERNAL);
/* Store rval and pop stack back to our frame's sp. */
*rval = fp->sp[-1];
fp->sp = oldsp;
out:
js_FreeStack(cx, mark);
return ok;
}
#endif /* JS_HAS_APPLY_FUNCTION */
static JSFunctionSpec function_methods[] = {
#if JS_HAS_TOSOURCE
{js_toSource_str, fun_toSource, 0,0,0},
#endif
{js_toString_str, fun_toString, 1,0,0},
#if JS_HAS_APPLY_FUNCTION
{"apply", fun_apply, 2,0,0},
#endif
#if JS_HAS_CALL_FUNCTION
{js_call_str, fun_call, 1,0,0},
#endif
{0,0,0,0,0}
};
JSBool
js_IsIdentifier(JSString *str)
{
size_t n;
jschar *s, c;
n = JSSTRING_LENGTH(str);
s = JSSTRING_CHARS(str);
c = *s;
/*
* We don't handle unicode escape sequences here
* because they won't be in the input string.
* (Right?)
*/
if (n == 0 || !JS_ISIDENT_START(c))
return JS_FALSE;
for (n--; n != 0; n--) {
c = *++s;
if (!JS_ISIDENT(c))
return JS_FALSE;
}
return JS_TRUE;
}
static JSBool
Function(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
JSFunction *fun;
JSObject *parent;
uintN i, n, lineno, dupflag;
JSAtom *atom;
const char *filename;
JSObject *obj2;
JSScopeProperty *sprop;
JSString *str, *arg;
JSStackFrame *fp;
void *mark;
JSTokenStream *ts;
JSPrincipals *principals;
jschar *collected_args, *cp;
size_t arg_length, args_length;
JSTokenType tt;
JSBool ok;
if (cx->fp && !(cx->fp->flags & JSFRAME_CONSTRUCTING)) {
obj = js_NewObject(cx, &js_FunctionClass, NULL, NULL);
if (!obj)
return JS_FALSE;
*rval = OBJECT_TO_JSVAL(obj);
}
fun = (JSFunction *) JS_GetPrivate(cx, obj);
if (fun)
return JS_TRUE;
#if JS_HAS_CALL_OBJECT
/*
* NB: (new Function) is not lexically closed by its caller, it's just an
* anonymous function in the top-level scope that its constructor inhabits.
* Thus 'var x = 42; f = new Function("return x"); print(f())' prints 42,
* and so would a call to f from another top-level's script or function.
*
* In older versions, before call objects, a new Function was adopted by
* its running context's globalObject, which might be different from the
* top-level reachable from scopeChain (in HTML frames, e.g.).
*/
parent = OBJ_GET_PARENT(cx, JSVAL_TO_OBJECT(argv[-2]));
#else
/* Set up for dynamic parenting (see js_Invoke in jsinterp.c). */
parent = NULL;
#endif
fun = js_NewFunction(cx, obj, NULL, 0, JSFUN_LAMBDA, parent,
(JSVERSION_IS_ECMA(cx->version))
? cx->runtime->atomState.anonymousAtom
: NULL);
if (!fun)
return JS_FALSE;
/*
* Function is static and not called directly by other functions in this
* file, therefore it is callable only as a native function by js_Invoke.
* Find the scripted caller, possibly skipping other native frames such as
* are built for Function.prototype.call or .apply activations that invoke
* Function indirectly from a script.
*/
fp = cx->fp;
JS_ASSERT(!fp->script && fp->fun && fp->fun->native == Function);
for (;;) {
fp = fp->down;
if (!fp) {
filename = NULL;
lineno = 0;
principals = NULL;
break;
}
if (fp->script) {
/*
* Load fp->script->* before calling js_PCToLineNumber, to avoid
* a pessimal reload of fp->script.
*/
principals = fp->script->principals;
filename = fp->script->filename;
lineno = js_PCToLineNumber(fp->script, fp->pc);
break;
}
}
n = argc ? argc - 1 : 0;
if (n > 0) {
/*
* Collect the function-argument arguments into one string, separated
* by commas, then make a tokenstream from that string, and scan it to
* get the arguments. We need to throw the full scanner at the
* problem, because the argument string can legitimately contain
* comments and linefeeds. XXX It might be better to concatenate
* everything up into a function definition and pass it to the
* compiler, but doing it this way is less of a delta from the old
* code. See ECMA 15.3.2.1.
*/
args_length = 0;
for (i = 0; i < n; i++) {
/* Collect the lengths for all the function-argument arguments. */
arg = js_ValueToString(cx, argv[i]);
if (!arg)
return JS_FALSE;
argv[i] = STRING_TO_JSVAL(arg);
args_length += JSSTRING_LENGTH(arg);
}
/* Add 1 for each joining comma. */
args_length += n - 1;
/*
* Allocate a string to hold the concatenated arguments, including room
* for a terminating 0. Mark cx->tempPool for later release, to free
* collected_args and its tokenstream in one swoop.
*/
mark = JS_ARENA_MARK(&cx->tempPool);
JS_ARENA_ALLOCATE_CAST(cp, jschar *, &cx->tempPool,
(args_length+1) * sizeof(jschar));
if (!cp)
return JS_FALSE;
collected_args = cp;
/*
* Concatenate the arguments into the new string, separated by commas.
*/
for (i = 0; i < n; i++) {
arg = JSVAL_TO_STRING(argv[i]);
arg_length = JSSTRING_LENGTH(arg);
(void) js_strncpy(cp, JSSTRING_CHARS(arg), arg_length);
cp += arg_length;
/* Add separating comma or terminating 0. */
*cp++ = (i + 1 < n) ? ',' : 0;
}
/*
* Make a tokenstream (allocated from cx->tempPool) that reads from
* the given string.
*/
ts = js_NewTokenStream(cx, collected_args, args_length, filename,
lineno, principals);
if (!ts) {
JS_ARENA_RELEASE(&cx->tempPool, mark);
return JS_FALSE;
}
/* The argument string may be empty or contain no tokens. */
tt = js_GetToken(cx, ts);
if (tt != TOK_EOF) {
while (1) {
/*
* Check that it's a name. This also implicitly guards against
* TOK_ERROR, which was already reported.
*/
if (tt != TOK_NAME)
goto bad_formal;
/*
* Get the atom corresponding to the name from the tokenstream;
* we're assured at this point that it's a valid identifier.
*/
atom = CURRENT_TOKEN(ts).t_atom;
if (!js_LookupProperty(cx, obj, (jsid)atom, &obj2,
(JSProperty **)&sprop)) {
goto bad_formal;
}
dupflag = 0;
if (sprop) {
ok = JS_TRUE;
if (obj2 == obj) {
/*
* A duplicate parameter name. We force a duplicate
* node on the SCOPE_LAST_PROP(scope) list with the
* same id, distinguished by the SPROP_IS_DUPLICATE
* flag, and not mapped by an entry in scope.
*/
JS_ASSERT(sprop->getter == js_GetArgument);
ok = js_ReportCompileErrorNumber(cx, ts, NULL,
JSREPORT_WARNING |
JSREPORT_STRICT,
JSMSG_DUPLICATE_FORMAL,
ATOM_BYTES(atom));
dupflag = SPROP_IS_DUPLICATE;
}
OBJ_DROP_PROPERTY(cx, obj2, (JSProperty *)sprop);
if (!ok)
goto bad_formal;
sprop = NULL;
}
if (!js_AddNativeProperty(cx, fun->object, (jsid)atom,
js_GetArgument, js_SetArgument,
SPROP_INVALID_SLOT,
JSPROP_ENUMERATE | JSPROP_PERMANENT |
JSPROP_SHARED,
SPROP_HAS_SHORTID | dupflag,
fun->nargs)) {
goto bad_formal;
}
fun->nargs++;
/*
* Get the next token. Stop on end of stream. Otherwise
* insist on a comma, get another name, and iterate.
*/
tt = js_GetToken(cx, ts);
if (tt == TOK_EOF)
break;
if (tt != TOK_COMMA)
goto bad_formal;
tt = js_GetToken(cx, ts);
}
}
/* Clean up. */
ok = js_CloseTokenStream(cx, ts);
JS_ARENA_RELEASE(&cx->tempPool, mark);
if (!ok)
return JS_FALSE;
}
if (argc) {
str = js_ValueToString(cx, argv[argc-1]);
} else {
/* Can't use cx->runtime->emptyString because we're called too early. */
str = js_NewStringCopyZ(cx, js_empty_ucstr, 0);
}
if (!str)
return JS_FALSE;
if (argv) {
/* Use the last arg (or this if argc == 0) as a local GC root. */
argv[(intN)(argc-1)] = STRING_TO_JSVAL(str);
}
mark = JS_ARENA_MARK(&cx->tempPool);
ts = js_NewTokenStream(cx, JSSTRING_CHARS(str), JSSTRING_LENGTH(str),
filename, lineno, principals);
if (!ts) {
ok = JS_FALSE;
} else {
ok = js_CompileFunctionBody(cx, ts, fun) &&
js_CloseTokenStream(cx, ts);
}
JS_ARENA_RELEASE(&cx->tempPool, mark);
return ok;
bad_formal:
/*
* Report "malformed formal parameter" iff no illegal char or similar
* scanner error was already reported.
*/
if (!(ts->flags & TSF_ERROR))
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_BAD_FORMAL);
/*
* Clean up the arguments string and tokenstream if we failed to parse
* the arguments.
*/
(void)js_CloseTokenStream(cx, ts);
JS_ARENA_RELEASE(&cx->tempPool, mark);
return JS_FALSE;
}
JSObject *
js_InitFunctionClass(JSContext *cx, JSObject *obj)
{
JSObject *proto;
JSAtom *atom;
JSFunction *fun;
proto = JS_InitClass(cx, obj, NULL, &js_FunctionClass, Function, 1,
function_props, function_methods, NULL, NULL);
if (!proto)
return NULL;
atom = js_Atomize(cx, js_FunctionClass.name, strlen(js_FunctionClass.name),
0);
if (!atom)
goto bad;
fun = js_NewFunction(cx, proto, NULL, 0, 0, obj, NULL);
if (!fun)
goto bad;
fun->script = js_NewScript(cx, 0);
if (!fun->script)
goto bad;
return proto;
bad:
cx->newborn[GCX_OBJECT] = NULL;
return NULL;
}
#if JS_HAS_CALL_OBJECT
JSObject *
js_InitCallClass(JSContext *cx, JSObject *obj)
{
return JS_InitClass(cx, obj, NULL, &js_CallClass, NULL, 0,
call_props, NULL, NULL, NULL);
}
#endif
JSFunction *
js_NewFunction(JSContext *cx, JSObject *funobj, JSNative native, uintN nargs,
uintN flags, JSObject *parent, JSAtom *atom)
{
JSFunction *fun;
/* Allocate a function struct. */
fun = (JSFunction *) JS_malloc(cx, sizeof *fun);
if (!fun)
return NULL;
/* If funobj is null, allocate an object for it. */
if (funobj) {
OBJ_SET_PARENT(cx, funobj, parent);
} else {
funobj = js_NewObject(cx, &js_FunctionClass, NULL, parent);
if (!funobj) {
JS_free(cx, fun);
return NULL;
}
}
/* Initialize all function members. */
fun->nrefs = 0;
fun->object = NULL;
fun->native = native;
fun->script = NULL;
fun->nargs = nargs;
fun->extra = 0;
fun->nvars = 0;
fun->flags = flags & JSFUN_FLAGS_MASK;
fun->spare = 0;
fun->atom = atom;
fun->clasp = NULL;
/* Link fun to funobj and vice versa. */
if (!js_LinkFunctionObject(cx, fun, funobj)) {
cx->newborn[GCX_OBJECT] = NULL;
JS_free(cx, fun);
return NULL;
}
return fun;
}
JSObject *
js_CloneFunctionObject(JSContext *cx, JSObject *funobj, JSObject *parent)
{
JSObject *newfunobj;
JSFunction *fun;
JS_ASSERT(OBJ_GET_CLASS(cx, funobj) == &js_FunctionClass);
newfunobj = js_NewObject(cx, &js_FunctionClass, funobj, parent);
if (!newfunobj)
return NULL;
fun = (JSFunction *) JS_GetPrivate(cx, funobj);
if (!js_LinkFunctionObject(cx, fun, newfunobj)) {
cx->newborn[GCX_OBJECT] = NULL;
return NULL;
}
return newfunobj;
}
JSBool
js_LinkFunctionObject(JSContext *cx, JSFunction *fun, JSObject *funobj)
{
if (!fun->object)
fun->object = funobj;
if (!JS_SetPrivate(cx, funobj, fun))
return JS_FALSE;
JS_ATOMIC_INCREMENT(&fun->nrefs);
return JS_TRUE;
}
JSFunction *
js_DefineFunction(JSContext *cx, JSObject *obj, JSAtom *atom, JSNative native,
uintN nargs, uintN attrs)
{
JSFunction *fun;
fun = js_NewFunction(cx, NULL, native, nargs, attrs, obj, atom);
if (!fun)
return NULL;
if (!OBJ_DEFINE_PROPERTY(cx, obj, (jsid)atom, OBJECT_TO_JSVAL(fun->object),
NULL, NULL, attrs & ~JSFUN_FLAGS_MASK, NULL)) {
return NULL;
}
return fun;
}
JSFunction *
js_ValueToFunction(JSContext *cx, jsval *vp, JSBool constructing)
{
jsval v;
JSObject *obj;
v = *vp;
obj = NULL;
if (JSVAL_IS_OBJECT(v)) {
obj = JSVAL_TO_OBJECT(v);
if (obj && OBJ_GET_CLASS(cx, obj) != &js_FunctionClass) {
if (!OBJ_DEFAULT_VALUE(cx, obj, JSTYPE_FUNCTION, &v))
return NULL;
obj = JSVAL_IS_FUNCTION(cx, v) ? JSVAL_TO_OBJECT(v) : NULL;
}
}
if (!obj) {
js_ReportIsNotFunction(cx, vp, constructing);
return NULL;
}
return (JSFunction *) JS_GetPrivate(cx, obj);
}
void
js_ReportIsNotFunction(JSContext *cx, jsval *vp, JSBool constructing)
{
JSType type;
JSString *fallback;
JSStackFrame *fp;
JSString *str;
/*
* We provide the typename as the fallback to handle the case when
* valueOf is not a function, which prevents ValueToString from being
* called as the default case inside js_DecompileValueGenerator (and
* so recursing back to here).
*/
type = JS_TypeOfValue(cx, *vp);
fallback = ATOM_TO_STRING(cx->runtime->atomState.typeAtoms[type]);
fp = cx->fp;
str = js_DecompileValueGenerator(cx, fp ? vp - fp->sp : JSDVG_IGNORE_STACK,
*vp, fallback);
if (str) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
(uintN)(constructing ? JSMSG_NOT_CONSTRUCTOR
: JSMSG_NOT_FUNCTION),
JS_GetStringBytes(str));
}
}
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