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jsscript.cpp
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jsscript.cpp
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sw=4 et tw=78:
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* JS script operations.
*/
#include "jsstddef.h"
#include <string.h>
#include "jstypes.h"
#include "jsutil.h" /* Added by JSIFY */
#include "jsprf.h"
#include "jsapi.h"
#include "jsatom.h"
#include "jscntxt.h"
#include "jsversion.h"
#include "jsdbgapi.h"
#include "jsemit.h"
#include "jsfun.h"
#include "jsinterp.h"
#include "jslock.h"
#include "jsnum.h"
#include "jsopcode.h"
#include "jsparse.h"
#include "jsscope.h"
#include "jsscript.h"
#if JS_HAS_XDR
#include "jsxdrapi.h"
#endif
#if JS_HAS_SCRIPT_OBJECT
static const char js_script_exec_str[] = "Script.prototype.exec";
static const char js_script_compile_str[] = "Script.prototype.compile";
/*
* This routine requires that obj has been locked previously.
*/
static jsint
GetScriptExecDepth(JSContext *cx, JSObject *obj)
{
jsval v;
JS_ASSERT(JS_IS_OBJ_LOCKED(cx, obj));
v = LOCKED_OBJ_GET_SLOT(obj, JSSLOT_START(&js_ScriptClass));
return JSVAL_TO_INT(v);
}
static void
AdjustScriptExecDepth(JSContext *cx, JSObject *obj, jsint delta)
{
jsint execDepth;
JS_LOCK_OBJ(cx, obj);
execDepth = GetScriptExecDepth(cx, obj);
LOCKED_OBJ_SET_SLOT(obj, JSSLOT_START(&js_ScriptClass),
INT_TO_JSVAL(execDepth + delta));
JS_UNLOCK_OBJ(cx, obj);
}
#if JS_HAS_TOSOURCE
static JSBool
script_toSource(JSContext *cx, uintN argc, jsval *vp)
{
JSObject *obj;
uint32 indent;
JSScript *script;
size_t i, j, k, n;
char buf[16];
jschar *s, *t;
JSString *str;
obj = JS_THIS_OBJECT(cx, vp);
if (!JS_InstanceOf(cx, obj, &js_ScriptClass, vp + 2))
return JS_FALSE;
indent = 0;
if (argc != 0) {
indent = js_ValueToECMAUint32(cx, &vp[2]);
if (JSVAL_IS_NULL(vp[2]))
return JS_FALSE;
}
script = (JSScript *) JS_GetPrivate(cx, obj);
/* Let n count the source string length, j the "front porch" length. */
j = JS_snprintf(buf, sizeof buf, "(new %s(", js_ScriptClass.name);
n = j + 2;
if (!script) {
/* Let k count the constructor argument string length. */
k = 0;
s = NULL; /* quell GCC overwarning */
} else {
str = JS_DecompileScript(cx, script, "Script.prototype.toSource",
(uintN)indent);
if (!str)
return JS_FALSE;
str = js_QuoteString(cx, str, '\'');
if (!str)
return JS_FALSE;
JSSTRING_CHARS_AND_LENGTH(str, s, k);
n += k;
}
/* Allocate the source string and copy into it. */
t = (jschar *) JS_malloc(cx, (n + 1) * sizeof(jschar));
if (!t)
return JS_FALSE;
for (i = 0; i < j; i++)
t[i] = buf[i];
for (j = 0; j < k; i++, j++)
t[i] = s[j];
t[i++] = ')';
t[i++] = ')';
t[i] = 0;
/* Create and return a JS string for t. */
str = JS_NewUCString(cx, t, n);
if (!str) {
JS_free(cx, t);
return JS_FALSE;
}
*vp = STRING_TO_JSVAL(str);
return JS_TRUE;
}
#endif /* JS_HAS_TOSOURCE */
static JSBool
script_toString(JSContext *cx, uintN argc, jsval *vp)
{
uint32 indent;
JSObject *obj;
JSScript *script;
JSString *str;
indent = 0;
if (argc != 0) {
indent = js_ValueToECMAUint32(cx, &vp[2]);
if (JSVAL_IS_NULL(vp[2]))
return JS_FALSE;
}
obj = JS_THIS_OBJECT(cx, vp);
if (!JS_InstanceOf(cx, obj, &js_ScriptClass, vp + 2))
return JS_FALSE;
script = (JSScript *) JS_GetPrivate(cx, obj);
if (!script) {
*vp = STRING_TO_JSVAL(cx->runtime->emptyString);
return JS_TRUE;
}
str = JS_DecompileScript(cx, script, "Script.prototype.toString",
(uintN)indent);
if (!str)
return JS_FALSE;
*vp = STRING_TO_JSVAL(str);
return JS_TRUE;
}
static JSBool
script_compile_sub(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
JSString *str;
JSObject *scopeobj;
jsval v;
JSScript *script, *oldscript;
JSStackFrame *caller;
const char *file;
uintN line;
JSPrincipals *principals;
uint32 tcflags;
jsint execDepth;
/* Make sure obj is a Script object. */
if (!JS_InstanceOf(cx, obj, &js_ScriptClass, argv))
return JS_FALSE;
/* If no args, leave private undefined and return early. */
if (argc == 0)
goto out;
/* Otherwise, the first arg is the script source to compile. */
str = js_ValueToString(cx, argv[0]);
if (!str)
return JS_FALSE;
argv[0] = STRING_TO_JSVAL(str);
scopeobj = NULL;
if (argc >= 2) {
if (!js_ValueToObject(cx, argv[1], &scopeobj))
return JS_FALSE;
argv[1] = OBJECT_TO_JSVAL(scopeobj);
}
/* Compile using the caller's scope chain, which js_Invoke passes to fp. */
caller = JS_GetScriptedCaller(cx, cx->fp);
JS_ASSERT(!caller || cx->fp->scopeChain == caller->scopeChain);
if (caller) {
if (!scopeobj) {
scopeobj = js_GetScopeChain(cx, caller);
if (!scopeobj)
return JS_FALSE;
}
principals = JS_EvalFramePrincipals(cx, cx->fp, caller);
file = js_ComputeFilename(cx, caller, principals, &line);
} else {
file = NULL;
line = 0;
principals = NULL;
}
/* Ensure we compile this script with the right (inner) principals. */
scopeobj = js_CheckScopeChainValidity(cx, scopeobj, js_script_compile_str);
if (!scopeobj)
return JS_FALSE;
/*
* Compile the new script using the caller's scope chain, a la eval().
* Unlike jsobj.c:obj_eval, however, we do not pass TCF_COMPILE_N_GO in
* tcflags and use NULL for the callerFrame argument, because compilation
* is here separated from execution, and the run-time scope chain may not
* match the compile-time. TCF_COMPILE_N_GO is tested in jsemit.c and
* jsparse.c to optimize based on identity of run- and compile-time scope.
*/
tcflags = 0;
script = js_CompileScript(cx, scopeobj, NULL, principals, tcflags,
JSSTRING_CHARS(str), JSSTRING_LENGTH(str),
NULL, file, line);
if (!script)
return JS_FALSE;
JS_LOCK_OBJ(cx, obj);
execDepth = GetScriptExecDepth(cx, obj);
/*
* execDepth must be 0 to allow compilation here, otherwise the JSScript
* struct can be released while running.
*/
if (execDepth > 0) {
JS_UNLOCK_OBJ(cx, obj);
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_COMPILE_EXECED_SCRIPT);
return JS_FALSE;
}
/* Swap script for obj's old script, if any. */
v = LOCKED_OBJ_GET_SLOT(obj, JSSLOT_PRIVATE);
oldscript = (JSScript*) (!JSVAL_IS_VOID(v) ? JSVAL_TO_PRIVATE(v) : NULL);
LOCKED_OBJ_SET_SLOT(obj, JSSLOT_PRIVATE, PRIVATE_TO_JSVAL(script));
JS_UNLOCK_OBJ(cx, obj);
if (oldscript)
js_DestroyScript(cx, oldscript);
script->u.object = obj;
js_CallNewScriptHook(cx, script, NULL);
out:
/* Return the object. */
*rval = OBJECT_TO_JSVAL(obj);
return JS_TRUE;
}
static JSBool
script_compile(JSContext *cx, uintN argc, jsval *vp)
{
return script_compile_sub(cx, JS_THIS_OBJECT(cx, vp), argc, vp + 2, vp);
}
static JSBool
script_exec_sub(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
JSObject *scopeobj, *parent;
JSStackFrame *fp, *caller;
JSPrincipals *principals;
JSScript *script;
JSBool ok;
if (!JS_InstanceOf(cx, obj, &js_ScriptClass, argv))
return JS_FALSE;
scopeobj = NULL;
if (argc != 0) {
if (!js_ValueToObject(cx, argv[0], &scopeobj))
return JS_FALSE;
argv[0] = OBJECT_TO_JSVAL(scopeobj);
}
/*
* Emulate eval() by using caller's this, var object, sharp array, etc.,
* all propagated by js_Execute via a non-null fourth (down) argument to
* js_Execute. If there is no scripted caller, js_Execute uses its second
* (chain) argument to set the exec frame's varobj, thisp, and scopeChain.
*
* Unlike eval, which the compiler detects, Script.prototype.exec may be
* called from a lightweight function, or even from native code (in which
* case fp->varobj and fp->scopeChain are null). If exec is called from
* a lightweight function, we will need to get a Call object representing
* its frame, to act as the var object and scope chain head.
*/
fp = cx->fp;
caller = JS_GetScriptedCaller(cx, fp);
if (caller && !caller->varobj) {
/* Called from a lightweight function. */
JS_ASSERT(caller->fun && !JSFUN_HEAVYWEIGHT_TEST(caller->fun->flags));
/* Scope chain links from Call object to callee's parent. */
parent = OBJ_GET_PARENT(cx, caller->callee);
if (!js_GetCallObject(cx, caller, parent))
return JS_FALSE;
}
if (!scopeobj) {
/* No scope object passed in: try to use the caller's scope chain. */
if (caller) {
/*
* Load caller->scopeChain after the conditional js_GetCallObject
* call above, which resets scopeChain as well as varobj.
*/
scopeobj = js_GetScopeChain(cx, caller);
if (!scopeobj)
return JS_FALSE;
} else {
/*
* Called from native code, so we don't know what scope object to
* use. We could use parent (see above), but Script.prototype.exec
* might be a shared/sealed "superglobal" method. A more general
* approach would use cx->globalObject, which will be the same as
* exec.__parent__ in the non-superglobal case. In the superglobal
* case it's the right object: the global, not the superglobal.
*/
scopeobj = cx->globalObject;
}
}
scopeobj = js_CheckScopeChainValidity(cx, scopeobj, js_script_exec_str);
if (!scopeobj)
return JS_FALSE;
/* Keep track of nesting depth for the script. */
AdjustScriptExecDepth(cx, obj, 1);
/* Must get to out label after this */
script = (JSScript *) JS_GetPrivate(cx, obj);
if (!script) {
ok = JS_FALSE;
goto out;
}
/* Belt-and-braces: check that this script object has access to scopeobj. */
principals = script->principals;
ok = js_CheckPrincipalsAccess(cx, scopeobj, principals,
CLASS_ATOM(cx, Script));
if (!ok)
goto out;
ok = js_Execute(cx, scopeobj, script, caller, JSFRAME_EVAL, rval);
out:
AdjustScriptExecDepth(cx, obj, -1);
return ok;
}
static JSBool
script_exec(JSContext *cx, uintN argc, jsval *vp)
{
return script_exec_sub(cx, JS_THIS_OBJECT(cx, vp), argc, vp + 2, vp);
}
#endif /* JS_HAS_SCRIPT_OBJECT */
#if JS_HAS_XDR
JSBool
js_XDRScript(JSXDRState *xdr, JSScript **scriptp, JSBool *hasMagic)
{
JSContext *cx;
JSScript *script, *oldscript;
JSBool ok;
jsbytecode *code;
uint32 length, lineno, nslots, magic;
uint32 natoms, nsrcnotes, ntrynotes, nobjects, nupvars, nregexps, i;
uint32 prologLength, version;
JSTempValueRooter tvr;
JSPrincipals *principals;
uint32 encodeable;
JSBool filenameWasSaved;
jssrcnote *notes, *sn;
JSSecurityCallbacks *callbacks;
cx = xdr->cx;
script = *scriptp;
nsrcnotes = ntrynotes = natoms = nobjects = nupvars = nregexps = 0;
filenameWasSaved = JS_FALSE;
notes = NULL;
if (xdr->mode == JSXDR_ENCODE)
magic = JSXDR_MAGIC_SCRIPT_CURRENT;
if (!JS_XDRUint32(xdr, &magic))
return JS_FALSE;
if (magic != JSXDR_MAGIC_SCRIPT_CURRENT) {
/* We do not provide binary compatibility with older scripts. */
if (!hasMagic) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_BAD_SCRIPT_MAGIC);
return JS_FALSE;
}
*hasMagic = JS_FALSE;
return JS_TRUE;
}
if (hasMagic)
*hasMagic = JS_TRUE;
if (xdr->mode == JSXDR_ENCODE) {
length = script->length;
prologLength = PTRDIFF(script->main, script->code, jsbytecode);
JS_ASSERT((int16)script->version != JSVERSION_UNKNOWN);
version = (uint32)script->version | (script->nfixed << 16);
lineno = (uint32)script->lineno;
nslots = (uint32)script->nslots;
nslots = (uint32)((script->staticDepth << 16) | script->nslots);
natoms = (uint32)script->atomMap.length;
/* Count the srcnotes, keeping notes pointing at the first one. */
notes = SCRIPT_NOTES(script);
for (sn = notes; !SN_IS_TERMINATOR(sn); sn = SN_NEXT(sn))
continue;
nsrcnotes = PTRDIFF(sn, notes, jssrcnote);
nsrcnotes++; /* room for the terminator */
if (script->objectsOffset != 0)
nobjects = JS_SCRIPT_OBJECTS(script)->length;
if (script->upvarsOffset != 0)
nupvars = JS_SCRIPT_UPVARS(script)->length;
if (script->regexpsOffset != 0)
nregexps = JS_SCRIPT_REGEXPS(script)->length;
if (script->trynotesOffset != 0)
ntrynotes = JS_SCRIPT_TRYNOTES(script)->length;
}
if (!JS_XDRUint32(xdr, &length))
return JS_FALSE;
if (!JS_XDRUint32(xdr, &prologLength))
return JS_FALSE;
if (!JS_XDRUint32(xdr, &version))
return JS_FALSE;
/*
* To fuse allocations, we need srcnote, atom, objects, upvar, regexp,
* and trynote counts early.
*/
if (!JS_XDRUint32(xdr, &natoms))
return JS_FALSE;
if (!JS_XDRUint32(xdr, &nsrcnotes))
return JS_FALSE;
if (!JS_XDRUint32(xdr, &ntrynotes))
return JS_FALSE;
if (!JS_XDRUint32(xdr, &nobjects))
return JS_FALSE;
if (!JS_XDRUint32(xdr, &nupvars))
return JS_FALSE;
if (!JS_XDRUint32(xdr, &nregexps))
return JS_FALSE;
if (xdr->mode == JSXDR_DECODE) {
script = js_NewScript(cx, length, nsrcnotes, natoms, nobjects, nupvars,
nregexps, ntrynotes);
if (!script)
return JS_FALSE;
script->main += prologLength;
script->version = (JSVersion) (version & 0xffff);
script->nfixed = (uint16) (version >> 16);
/* If we know nsrcnotes, we allocated space for notes in script. */
notes = SCRIPT_NOTES(script);
*scriptp = script;
JS_PUSH_TEMP_ROOT_SCRIPT(cx, script, &tvr);
}
/*
* Control hereafter must goto error on failure, in order for the
* DECODE case to destroy script.
*/
oldscript = xdr->script;
code = script->code;
if (xdr->mode == JSXDR_ENCODE) {
code = js_UntrapScriptCode(cx, script);
if (!code)
goto error;
}
xdr->script = script;
ok = JS_XDRBytes(xdr, (char *) code, length * sizeof(jsbytecode));
if (code != script->code)
JS_free(cx, code);
if (!ok)
goto error;
if (!JS_XDRBytes(xdr, (char *)notes, nsrcnotes * sizeof(jssrcnote)) ||
!JS_XDRCStringOrNull(xdr, (char **)&script->filename) ||
!JS_XDRUint32(xdr, &lineno) ||
!JS_XDRUint32(xdr, &nslots)) {
goto error;
}
callbacks = JS_GetSecurityCallbacks(cx);
if (xdr->mode == JSXDR_ENCODE) {
principals = script->principals;
encodeable = callbacks && callbacks->principalsTranscoder;
if (!JS_XDRUint32(xdr, &encodeable))
goto error;
if (encodeable &&
!callbacks->principalsTranscoder(xdr, &principals)) {
goto error;
}
} else {
if (!JS_XDRUint32(xdr, &encodeable))
goto error;
if (encodeable) {
if (!(callbacks && callbacks->principalsTranscoder)) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_CANT_DECODE_PRINCIPALS);
goto error;
}
if (!callbacks->principalsTranscoder(xdr, &principals))
goto error;
script->principals = principals;
}
}
if (xdr->mode == JSXDR_DECODE) {
const char *filename = script->filename;
if (filename) {
filename = js_SaveScriptFilename(cx, filename);
if (!filename)
goto error;
JS_free(cx, (void *) script->filename);
script->filename = filename;
filenameWasSaved = JS_TRUE;
}
script->lineno = (uintN)lineno;
script->nslots = (uint16)nslots;
script->staticDepth = nslots >> 16;
}
for (i = 0; i != natoms; ++i) {
if (!js_XDRAtom(xdr, &script->atomMap.vector[i]))
goto error;
}
/*
* Here looping from 0-to-length to xdr objects is essential. It ensures
* that block objects from the script->objects array will be written and
* restored in the outer-to-inner order. block_xdrObject relies on this to
* restore the parent chain.
*/
for (i = 0; i != nobjects; ++i) {
if (!js_XDRObject(xdr, &JS_SCRIPT_OBJECTS(script)->vector[i]))
goto error;
}
for (i = 0; i != nupvars; ++i) {
if (!JS_XDRUint32(xdr, &JS_SCRIPT_UPVARS(script)->vector[i]))
goto error;
}
for (i = 0; i != nregexps; ++i) {
if (!js_XDRObject(xdr, &JS_SCRIPT_REGEXPS(script)->vector[i]))
goto error;
}
if (ntrynotes != 0) {
/*
* We combine tn->kind and tn->stackDepth when serializing as XDR is not
* efficient when serializing small integer types.
*/
JSTryNote *tn, *tnfirst;
uint32 kindAndDepth;
JS_STATIC_ASSERT(sizeof(tn->kind) == sizeof(uint8));
JS_STATIC_ASSERT(sizeof(tn->stackDepth) == sizeof(uint16));
tnfirst = JS_SCRIPT_TRYNOTES(script)->vector;
JS_ASSERT(JS_SCRIPT_TRYNOTES(script)->length == ntrynotes);
tn = tnfirst + ntrynotes;
do {
--tn;
if (xdr->mode == JSXDR_ENCODE) {
kindAndDepth = ((uint32)tn->kind << 16)
| (uint32)tn->stackDepth;
}
if (!JS_XDRUint32(xdr, &kindAndDepth) ||
!JS_XDRUint32(xdr, &tn->start) ||
!JS_XDRUint32(xdr, &tn->length)) {
goto error;
}
if (xdr->mode == JSXDR_DECODE) {
tn->kind = (uint8)(kindAndDepth >> 16);
tn->stackDepth = (uint16)kindAndDepth;
}
} while (tn != tnfirst);
}
xdr->script = oldscript;
if (xdr->mode == JSXDR_DECODE)
JS_POP_TEMP_ROOT(cx, &tvr);
return JS_TRUE;
error:
if (xdr->mode == JSXDR_DECODE) {
JS_POP_TEMP_ROOT(cx, &tvr);
if (script->filename && !filenameWasSaved) {
JS_free(cx, (void *) script->filename);
script->filename = NULL;
}
js_DestroyScript(cx, script);
*scriptp = NULL;
}
xdr->script = oldscript;
return JS_FALSE;
}
#if JS_HAS_SCRIPT_OBJECT && JS_HAS_XDR_FREEZE_THAW
/*
* These cannot be exposed to web content, and chrome does not need them, so
* we take them out of the Mozilla client altogether. Fortunately, there is
* no way to serialize a native function (see fun_xdrObject in jsfun.c).
*/
static JSBool
script_freeze(JSContext *cx, uintN argc, jsval *vp)
{
JSObject *obj;
JSXDRState *xdr;
JSScript *script;
JSBool ok, hasMagic;
uint32 len;
void *buf;
JSString *str;
obj = JS_THIS_OBJECT(cx, vp);
if (!JS_InstanceOf(cx, obj, &js_ScriptClass, vp + 2))
return JS_FALSE;
script = (JSScript *) JS_GetPrivate(cx, obj);
if (!script)
return JS_TRUE;
/* create new XDR */
xdr = JS_XDRNewMem(cx, JSXDR_ENCODE);
if (!xdr)
return JS_FALSE;
/* write */
ok = js_XDRScript(xdr, &script, &hasMagic);
if (!ok)
goto out;
if (!hasMagic) {
*vp = JSVAL_VOID;
goto out;
}
buf = JS_XDRMemGetData(xdr, &len);
if (!buf) {
ok = JS_FALSE;
goto out;
}
JS_ASSERT((jsword)buf % sizeof(jschar) == 0);
len /= sizeof(jschar);
#if IS_BIG_ENDIAN
{
jschar *chars;
uint32 i;
/* Swap bytes in Unichars to keep frozen strings machine-independent. */
chars = (jschar *)buf;
for (i = 0; i < len; i++)
chars[i] = JSXDR_SWAB16(chars[i]);
}
#endif
str = JS_NewUCStringCopyN(cx, (jschar *)buf, len);
if (!str) {
ok = JS_FALSE;
goto out;
}
*vp = STRING_TO_JSVAL(str);
out:
JS_XDRDestroy(xdr);
return ok;
}
static JSBool
script_thaw(JSContext *cx, uintN argc, jsval *vp)
{
JSObject *obj;
JSXDRState *xdr;
JSString *str;
void *buf;
uint32 len;
jsval v;
JSScript *script, *oldscript;
JSBool ok, hasMagic;
jsint execDepth;
obj = JS_THIS_OBJECT(cx, vp);
if (!JS_InstanceOf(cx, obj, &js_ScriptClass, vp + 2))
return JS_FALSE;
if (argc == 0)
return JS_TRUE;
str = js_ValueToString(cx, vp[2]);
if (!str)
return JS_FALSE;
vp[2] = STRING_TO_JSVAL(str);
/* create new XDR */
xdr = JS_XDRNewMem(cx, JSXDR_DECODE);
if (!xdr)
return JS_FALSE;
JSSTRING_CHARS_AND_LENGTH(str, buf, len);
#if IS_BIG_ENDIAN
{
jschar *from, *to;
uint32 i;
/* Swap bytes in Unichars to keep frozen strings machine-independent. */
from = (jschar *)buf;
to = (jschar *) JS_malloc(cx, len * sizeof(jschar));
if (!to) {
JS_XDRDestroy(xdr);
return JS_FALSE;
}
for (i = 0; i < len; i++)
to[i] = JSXDR_SWAB16(from[i]);
buf = (char *)to;
}
#endif
len *= sizeof(jschar);
JS_XDRMemSetData(xdr, buf, len);
/* XXXbe should magic mismatch be error, or false return value? */
ok = js_XDRScript(xdr, &script, &hasMagic);
if (!ok)
goto out;
if (!hasMagic) {
*vp = JSVAL_FALSE;
goto out;
}
JS_LOCK_OBJ(cx, obj);
execDepth = GetScriptExecDepth(cx, obj);
/*
* execDepth must be 0 to allow compilation here, otherwise the JSScript
* struct can be released while running.
*/
if (execDepth > 0) {
JS_UNLOCK_OBJ(cx, obj);
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_COMPILE_EXECED_SCRIPT);
goto out;
}
/* Swap script for obj's old script, if any. */
v = LOCKED_OBJ_GET_SLOT(obj, JSSLOT_PRIVATE);
oldscript = !JSVAL_IS_VOID(v) ? JSVAL_TO_PRIVATE(v) : NULL;
LOCKED_OBJ_SET_SLOT(obj, JSSLOT_PRIVATE, PRIVATE_TO_JSVAL(script));
JS_UNLOCK_OBJ(cx, obj);
if (oldscript)
js_DestroyScript(cx, oldscript);
script->u.object = obj;
js_CallNewScriptHook(cx, script, NULL);
out:
/*
* We reset the buffer to be NULL so that it doesn't free the chars
* memory owned by str (vp[2]).
*/
JS_XDRMemSetData(xdr, NULL, 0);
JS_XDRDestroy(xdr);
#if IS_BIG_ENDIAN
JS_free(cx, buf);
#endif
*vp = JSVAL_TRUE;
return ok;
}
static const char js_thaw_str[] = "thaw";
#endif /* JS_HAS_SCRIPT_OBJECT && JS_HAS_XDR_FREEZE_THAW */
#endif /* JS_HAS_XDR */
#if JS_HAS_SCRIPT_OBJECT
static JSFunctionSpec script_methods[] = {
#if JS_HAS_TOSOURCE
JS_FN(js_toSource_str, script_toSource, 0,0),
#endif
JS_FN(js_toString_str, script_toString, 0,0),
JS_FN("compile", script_compile, 2,0),
JS_FN("exec", script_exec, 1,0),
#if JS_HAS_XDR_FREEZE_THAW
JS_FN("freeze", script_freeze, 0,0),
JS_FN(js_thaw_str, script_thaw, 1,0),
#endif /* JS_HAS_XDR_FREEZE_THAW */
JS_FS_END
};
#endif /* JS_HAS_SCRIPT_OBJECT */
static void
script_finalize(JSContext *cx, JSObject *obj)
{
JSScript *script;
script = (JSScript *) JS_GetPrivate(cx, obj);
if (script)
js_DestroyScript(cx, script);
}
static JSBool
script_call(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
#if JS_HAS_SCRIPT_OBJECT
return script_exec_sub(cx, JSVAL_TO_OBJECT(argv[-2]), argc, argv, rval);
#else
return JS_FALSE;
#endif
}
static void
script_trace(JSTracer *trc, JSObject *obj)
{
JSScript *script;
script = (JSScript *) JS_GetPrivate(trc->context, obj);
if (script)
js_TraceScript(trc, script);
}
#if !JS_HAS_SCRIPT_OBJECT
#define JSProto_Script JSProto_Object
#endif
JS_FRIEND_DATA(JSClass) js_ScriptClass = {
js_Script_str,
JSCLASS_HAS_PRIVATE | JSCLASS_HAS_RESERVED_SLOTS(1) |
JSCLASS_MARK_IS_TRACE | JSCLASS_HAS_CACHED_PROTO(JSProto_Script),
JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, script_finalize,
NULL, NULL, script_call, NULL,/*XXXbe xdr*/
NULL, NULL, JS_CLASS_TRACE(script_trace), NULL
};
#if JS_HAS_SCRIPT_OBJECT
static JSBool
Script(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
/* If not constructing, replace obj with a new Script object. */
if (!(cx->fp->flags & JSFRAME_CONSTRUCTING)) {
obj = js_NewObject(cx, &js_ScriptClass, NULL, NULL, 0);
if (!obj)
return JS_FALSE;
/*
* script_compile_sub does not use rval to root its temporaries so we
* can use it to root obj.
*/
*rval = OBJECT_TO_JSVAL(obj);
}
if (!JS_SetReservedSlot(cx, obj, 0, INT_TO_JSVAL(0)))
return JS_FALSE;
return script_compile_sub(cx, obj, argc, argv, rval);
}
#if JS_HAS_SCRIPT_OBJECT && JS_HAS_XDR_FREEZE_THAW
static JSBool
script_static_thaw(JSContext *cx, uintN argc, jsval *vp)
{
JSObject *obj;
obj = js_NewObject(cx, &js_ScriptClass, NULL, NULL);
if (!obj)
return JS_FALSE;
vp[1] = OBJECT_TO_JSVAL(obj);
if (!script_thaw(cx, argc, vp))
return JS_FALSE;
*vp = OBJECT_TO_JSVAL(obj);
return JS_TRUE;
}
static JSFunctionSpec script_static_methods[] = {
JS_FN(js_thaw_str, script_static_thaw, 1,0),
JS_FS_END
};
#else /* !JS_HAS_SCRIPT_OBJECT || !JS_HAS_XDR_FREEZE_THAW */
#define script_static_methods NULL
#endif /* !JS_HAS_SCRIPT_OBJECT || !JS_HAS_XDR_FREEZE_THAW */
JSObject *
js_InitScriptClass(JSContext *cx, JSObject *obj)
{
return JS_InitClass(cx, obj, NULL, &js_ScriptClass, Script, 1,
NULL, script_methods, NULL, script_static_methods);
}
#endif /* JS_HAS_SCRIPT_OBJECT */
/*
* Shared script filename management.
*/
static int
js_compare_strings(const void *k1, const void *k2)
{
return strcmp((const char *) k1, (const char *) k2) == 0;
}
/* NB: This struct overlays JSHashEntry -- see jshash.h, do not reorganize. */
typedef struct ScriptFilenameEntry {
JSHashEntry *next; /* hash chain linkage */
JSHashNumber keyHash; /* key hash function result */
const void *key; /* ptr to filename, below */
uint32 flags; /* user-defined filename prefix flags */
JSPackedBool mark; /* GC mark flag */
char filename[3]; /* two or more bytes, NUL-terminated */
} ScriptFilenameEntry;
static void *
js_alloc_table_space(void *priv, size_t size)
{
return malloc(size);
}
static void
js_free_table_space(void *priv, void *item)
{
free(item);
}
static JSHashEntry *
js_alloc_sftbl_entry(void *priv, const void *key)
{
size_t nbytes = offsetof(ScriptFilenameEntry, filename) +
strlen((const char *) key) + 1;
return (JSHashEntry *) malloc(JS_MAX(nbytes, sizeof(JSHashEntry)));
}