moving trunk for module inkscape

(bzr r1)

1 files changed, 2059 insertions, 0 deletions

diff --git a/src/dom/js/jsfun.c b/src/dom/js/jsfun.c
new file mode 100644
index 000000000..93cd4009d
--- /dev/null
+++ b/src/dom/js/jsfun.c
@@ -0,0 +1,2059 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * ***** 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 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 "jsdbgapi.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, *cprop;
+    JSPropertyOp getter;
+    jsval *vec;
+    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)
+            vec = fp->argv;
+        else if (getter == js_GetLocalVariable)
+            vec = fp->vars;
+        else
+            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);
+        cprop = (JSScopeProperty *)prop;
+        LOCKED_OBJ_SET_SLOT(obj, cprop->slot, vec[sprop->shortid]);
+        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 _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:
+        while (fp && (fp->flags & JSFRAME_SKIP_CALLER) && fp->down)
+            fp = fp->down;
+        if (fp && fp->down && fp->down->fun && fp->down->argv)
+            *vp = fp->down->argv[-2];
+        else
+            *vp = JSVAL_NULL;
+        if (!JSVAL_IS_PRIMITIVE(*vp) && 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 _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;
+    uint32 userid;              /* NB: holds a signed int-tagged jsval */
+    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);
+                /* XXX lossy conversion, need new XDR version for ECMAv3 */
+                propname = JS_GetStringBytes(ATOM_TO_STRING((JSAtom *)sprop->id));
+                if (!propname ||
+                    !JS_XDRUint32(xdr, &type) ||
+                    !JS_XDRUint32(xdr, &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, &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
+};
+
+JSBool
+js_fun_toString(JSContext *cx, JSObject *obj, uint32 indent,
+                uintN argc, jsval *argv, jsval *rval)
+{
+    jsval fval;
+    JSFunction *fun;
+    JSString *str;
+
+    if (!argv) {
+        JS_ASSERT(JS_ObjectIsFunction(cx, obj));
+    } else {
+        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 js_fun_toString(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 js_fun_toString(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 | JSINVOKE_SKIP_CALLER);
+
+    /* 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)JS_MIN(length, ARGC_LIMIT - 1);
+    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 | JSINVOKE_SKIP_CALLER);
+
+    /* 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);
+    if (n == 0)
+        return JS_FALSE;
+    s = JSSTRING_CHARS(str);
+    c = *s;
+    if (!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)
+{
+    JSStackFrame *fp, *caller;
+    JSFunction *fun;
+    JSObject *parent;
+    uintN i, n, lineno, dupflag;
+    JSAtom *atom;
+    const char *filename;
+    JSObject *obj2;
+    JSScopeProperty *sprop;
+    JSString *str, *arg;
+    void *mark;
+    JSTokenStream *ts;
+    JSPrincipals *principals;
+    jschar *collected_args, *cp;
+    size_t arg_length, args_length;
+    JSTokenType tt;
+    JSBool ok;
+
+    fp = cx->fp;
+    if (fp && !(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.
+     */
+    JS_ASSERT(!fp->script && fp->fun && fp->fun->native == Function);
+    caller = JS_GetScriptedCaller(cx, fp);
+    if (caller) {
+        filename = caller->script->filename;
+        lineno = js_PCToLineNumber(cx, caller->script, caller->pc);
+        principals = JS_EvalFramePrincipals(cx, fp, caller);
+    } else {
+        filename = NULL;
+        lineno = 0;
+        principals = NULL;
+    }
+
+    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) {
+            for (;;) {
+                /*
+                 * 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) {
+                        const char *name = js_AtomToPrintableString(cx, atom);
+
+                        /*
+                         * 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 = name &&
+                             js_ReportCompileErrorNumber(cx, ts, NULL,
+                                                         JSREPORT_WARNING |
+                                                         JSREPORT_STRICT,
+                                                         JSMSG_DUPLICATE_FORMAL,
+                                                         name);
+
+                        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, 0, 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;
+}
+
+#if (JSV2F_CONSTRUCT & JSV2F_SEARCH_STACK)
+# error "JSINVOKE_CONSTRUCT and JSV2F_SEARCH_STACK are not disjoint!"
+#endif
+
+JSFunction *
+js_ValueToFunction(JSContext *cx, jsval *vp, uintN flags)
+{
+    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, flags);
+        return NULL;
+    }
+    return (JSFunction *) JS_GetPrivate(cx, obj);
+}
+
+void
+js_ReportIsNotFunction(JSContext *cx, jsval *vp, uintN flags)
+{
+    JSType type;
+    JSString *fallback;
+    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]);
+    str = js_DecompileValueGenerator(cx,
+                                     (flags & JSV2F_SEARCH_STACK)
+                                     ? JSDVG_SEARCH_STACK
+                                     : cx->fp
+                                     ? vp - cx->fp->sp
+                                     : JSDVG_IGNORE_STACK,
+                                     *vp,
+                                     fallback);
+    if (str) {
+        JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
+                             (uintN)((flags & JSV2F_CONSTRUCT)
+                                     ? JSMSG_NOT_CONSTRUCTOR
+                                     : JSMSG_NOT_FUNCTION),
+                             JS_GetStringBytes(str));
+    }
+}