https://github.com/mozilla/gecko-dev
Tip revision: 56a44f24366557e5532147cf28cd14f306f47c46 authored by Mats Palmgren on 31 May 2012, 18:03:59 UTC
Bug 759788: hold a strong ref to the nsPluginInstanceOwner in DoStopPlugin to avoid crashes, r=bsmedberg, a=akeybl
Bug 759788: hold a strong ref to the nsPluginInstanceOwner in DoStopPlugin to avoid crashes, r=bsmedberg, a=akeybl
Tip revision: 56a44f2
jscntxtinlines.h
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=4 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 SpiderMonkey code.
*
* The Initial Developer of the Original Code is
* Mozilla Corporation.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Jeff Walden <jwalden+code@mit.edu> (original author)
*
* 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 ***** */
#ifndef jscntxtinlines_h___
#define jscntxtinlines_h___
#include "jscntxt.h"
#include "jscompartment.h"
#include "jsfriendapi.h"
#include "jsinterp.h"
#include "jsxml.h"
#include "jsgc.h"
#include "frontend/ParseMaps.h"
#include "vm/RegExpObject.h"
namespace js {
struct PreserveRegsGuard
{
PreserveRegsGuard(JSContext *cx, FrameRegs ®s)
: prevContextRegs(cx->maybeRegs()), cx(cx), regs_(regs) {
cx->stack.repointRegs(®s_);
}
~PreserveRegsGuard() {
JS_ASSERT(cx->maybeRegs() == ®s_);
*prevContextRegs = regs_;
cx->stack.repointRegs(prevContextRegs);
}
FrameRegs *prevContextRegs;
private:
JSContext *cx;
FrameRegs ®s_;
};
static inline GlobalObject *
GetGlobalForScopeChain(JSContext *cx)
{
if (cx->hasfp())
return &cx->fp()->scopeChain().global();
JSObject *scope = JS_ObjectToInnerObject(cx, cx->globalObject);
if (!scope)
return NULL;
return &scope->asGlobal();
}
inline GSNCache *
GetGSNCache(JSContext *cx)
{
return &cx->runtime->gsnCache;
}
class AutoNamespaceArray : protected AutoGCRooter {
public:
AutoNamespaceArray(JSContext *cx)
: AutoGCRooter(cx, NAMESPACES), context(cx) {
array.init();
}
~AutoNamespaceArray() {
array.finish(context);
}
uint32_t length() const { return array.length; }
private:
JSContext *context;
friend void AutoGCRooter::trace(JSTracer *trc);
public:
JSXMLArray<JSObject> array;
};
template <typename T>
class AutoPtr
{
JSContext *cx;
T *value;
AutoPtr(const AutoPtr &other) MOZ_DELETE;
public:
explicit AutoPtr(JSContext *cx) : cx(cx), value(NULL) {}
~AutoPtr() {
cx->delete_<T>(value);
}
void operator=(T *ptr) { value = ptr; }
typedef void ***** ConvertibleToBool;
operator ConvertibleToBool() const { return (ConvertibleToBool) value; }
const T *operator->() const { return value; }
T *operator->() { return value; }
T *get() { return value; }
};
#ifdef DEBUG
class CompartmentChecker
{
JSContext *context;
JSCompartment *compartment;
public:
explicit CompartmentChecker(JSContext *cx) : context(cx), compartment(cx->compartment) {
check(cx->hasfp() ? JS_GetGlobalForScopeChain(cx) : cx->globalObject);
}
/*
* Set a breakpoint here (break js::CompartmentChecker::fail) to debug
* compartment mismatches.
*/
static void fail(JSCompartment *c1, JSCompartment *c2) {
printf("*** Compartment mismatch %p vs. %p\n", (void *) c1, (void *) c2);
JS_NOT_REACHED("compartment mismatched");
}
/* Note: should only be used when neither c1 nor c2 may be the default compartment. */
static void check(JSCompartment *c1, JSCompartment *c2) {
JS_ASSERT(c1 != c1->rt->atomsCompartment);
JS_ASSERT(c2 != c2->rt->atomsCompartment);
if (c1 != c2)
fail(c1, c2);
}
void check(JSCompartment *c) {
if (c && c != context->runtime->atomsCompartment) {
if (!compartment)
compartment = c;
else if (c != compartment)
fail(compartment, c);
}
}
void check(JSPrincipals *) { /* nothing for now */ }
void check(JSObject *obj) {
if (obj)
check(obj->compartment());
}
void check(JSString *str) {
if (!str->isAtom())
check(str->compartment());
}
void check(const js::Value &v) {
if (v.isObject())
check(&v.toObject());
else if (v.isString())
check(v.toString());
}
void check(const ValueArray &arr) {
for (size_t i = 0; i < arr.length; i++)
check(arr.array[i]);
}
void check(const JSValueArray &arr) {
for (size_t i = 0; i < arr.length; i++)
check(arr.array[i]);
}
void check(const CallArgs &args) {
for (Value *p = args.base(); p != args.end(); ++p)
check(*p);
}
void check(jsid id) {
if (JSID_IS_OBJECT(id))
check(JSID_TO_OBJECT(id));
}
void check(JSIdArray *ida) {
if (ida) {
for (int i = 0; i < ida->length; i++) {
if (JSID_IS_OBJECT(ida->vector[i]))
check(ida->vector[i]);
}
}
}
void check(JSScript *script) {
if (script) {
check(script->compartment());
if (!script->isCachedEval && script->globalObject)
check(script->globalObject);
}
}
void check(StackFrame *fp) {
if (fp)
check(&fp->scopeChain());
}
};
#endif
/*
* Don't perform these checks when called from a finalizer. The checking
* depends on other objects not having been swept yet.
*/
#define START_ASSERT_SAME_COMPARTMENT() \
if (cx->runtime->gcRunning) \
return; \
CompartmentChecker c(cx)
template <class T1> inline void
assertSameCompartment(JSContext *cx, T1 t1)
{
#ifdef DEBUG
START_ASSERT_SAME_COMPARTMENT();
c.check(t1);
#endif
}
template <class T1, class T2> inline void
assertSameCompartment(JSContext *cx, T1 t1, T2 t2)
{
#ifdef DEBUG
START_ASSERT_SAME_COMPARTMENT();
c.check(t1);
c.check(t2);
#endif
}
template <class T1, class T2, class T3> inline void
assertSameCompartment(JSContext *cx, T1 t1, T2 t2, T3 t3)
{
#ifdef DEBUG
START_ASSERT_SAME_COMPARTMENT();
c.check(t1);
c.check(t2);
c.check(t3);
#endif
}
template <class T1, class T2, class T3, class T4> inline void
assertSameCompartment(JSContext *cx, T1 t1, T2 t2, T3 t3, T4 t4)
{
#ifdef DEBUG
START_ASSERT_SAME_COMPARTMENT();
c.check(t1);
c.check(t2);
c.check(t3);
c.check(t4);
#endif
}
template <class T1, class T2, class T3, class T4, class T5> inline void
assertSameCompartment(JSContext *cx, T1 t1, T2 t2, T3 t3, T4 t4, T5 t5)
{
#ifdef DEBUG
START_ASSERT_SAME_COMPARTMENT();
c.check(t1);
c.check(t2);
c.check(t3);
c.check(t4);
c.check(t5);
#endif
}
#undef START_ASSERT_SAME_COMPARTMENT
STATIC_PRECONDITION_ASSUME(ubound(args.argv_) >= argc)
JS_ALWAYS_INLINE bool
CallJSNative(JSContext *cx, Native native, const CallArgs &args)
{
#ifdef DEBUG
JSBool alreadyThrowing = cx->isExceptionPending();
#endif
assertSameCompartment(cx, args);
bool ok = native(cx, args.length(), args.base());
if (ok) {
assertSameCompartment(cx, args.rval());
JS_ASSERT_IF(!alreadyThrowing, !cx->isExceptionPending());
}
return ok;
}
extern JSBool CallOrConstructBoundFunction(JSContext *, unsigned, js::Value *);
STATIC_PRECONDITION(ubound(args.argv_) >= argc)
JS_ALWAYS_INLINE bool
CallJSNativeConstructor(JSContext *cx, Native native, const CallArgs &args)
{
#ifdef DEBUG
JSObject &callee = args.callee();
#endif
JS_ASSERT(args.thisv().isMagic());
if (!CallJSNative(cx, native, args))
return false;
/*
* Native constructors must return non-primitive values on success.
* Although it is legal, if a constructor returns the callee, there is a
* 99.9999% chance it is a bug. If any valid code actually wants the
* constructor to return the callee, the assertion can be removed or
* (another) conjunct can be added to the antecedent.
*
* Proxies are exceptions to both rules: they can return primitives and
* they allow content to return the callee.
*
* CallOrConstructBoundFunction is an exception as well because we
* might have used bind on a proxy function.
*
* (new Object(Object)) returns the callee.
*/
JS_ASSERT_IF(native != FunctionProxyClass.construct &&
native != CallableObjectClass.construct &&
native != js::CallOrConstructBoundFunction &&
(!callee.isFunction() || callee.toFunction()->u.n.clasp != &ObjectClass),
!args.rval().isPrimitive() && callee != args.rval().toObject());
return true;
}
JS_ALWAYS_INLINE bool
CallJSPropertyOp(JSContext *cx, PropertyOp op, JSObject *receiver, jsid id, Value *vp)
{
assertSameCompartment(cx, receiver, id, *vp);
JSBool ok = op(cx, receiver, id, vp);
if (ok)
assertSameCompartment(cx, receiver, *vp);
return ok;
}
JS_ALWAYS_INLINE bool
CallJSPropertyOpSetter(JSContext *cx, StrictPropertyOp op, JSObject *obj, jsid id,
JSBool strict, Value *vp)
{
assertSameCompartment(cx, obj, id, *vp);
return op(cx, obj, id, strict, vp);
}
inline bool
CallSetter(JSContext *cx, JSObject *obj, jsid id, StrictPropertyOp op, unsigned attrs,
unsigned shortid, JSBool strict, Value *vp)
{
if (attrs & JSPROP_SETTER)
return InvokeGetterOrSetter(cx, obj, CastAsObjectJsval(op), 1, vp, vp);
if (attrs & JSPROP_GETTER)
return js_ReportGetterOnlyAssignment(cx);
if (attrs & JSPROP_SHORTID)
id = INT_TO_JSID(shortid);
return CallJSPropertyOpSetter(cx, op, obj, id, strict, vp);
}
static inline JSAtom **
FrameAtomBase(JSContext *cx, js::StackFrame *fp)
{
return fp->script()->atoms;
}
} /* namespace js */
inline JSVersion
JSContext::findVersion() const
{
if (hasVersionOverride)
return versionOverride;
if (stack.hasfp()) {
/* There may be a scripted function somewhere on the stack! */
js::StackFrame *f = fp();
while (f && !f->isScriptFrame())
f = f->prev();
if (f)
return f->script()->getVersion();
}
return defaultVersion;
}
inline bool
JSContext::canSetDefaultVersion() const
{
return !stack.hasfp() && !hasVersionOverride;
}
inline void
JSContext::overrideVersion(JSVersion newVersion)
{
JS_ASSERT(!canSetDefaultVersion());
versionOverride = newVersion;
hasVersionOverride = true;
}
inline bool
JSContext::maybeOverrideVersion(JSVersion newVersion)
{
if (canSetDefaultVersion()) {
setDefaultVersion(newVersion);
return false;
}
overrideVersion(newVersion);
return true;
}
inline unsigned
JSContext::getCompileOptions() const { return js::VersionFlagsToOptions(findVersion()); }
inline unsigned
JSContext::allOptions() const { return getRunOptions() | getCompileOptions(); }
inline void
JSContext::setCompileOptions(unsigned newcopts)
{
JS_ASSERT((newcopts & JSCOMPILEOPTION_MASK) == newcopts);
if (JS_LIKELY(getCompileOptions() == newcopts))
return;
JSVersion version = findVersion();
JSVersion newVersion = js::OptionFlagsToVersion(newcopts, version);
maybeOverrideVersion(newVersion);
}
inline void
JSContext::assertValidStackDepth(unsigned depth)
{
#ifdef DEBUG
JS_ASSERT(0 <= regs().sp - fp()->base());
JS_ASSERT(depth <= uintptr_t(regs().sp - fp()->base()));
#endif
}
#ifdef JS_METHODJIT
inline js::mjit::JaegerCompartment *JSContext::jaegerCompartment()
{
return compartment->jaegerCompartment();
}
#endif
inline js::LifoAlloc &
JSContext::typeLifoAlloc()
{
return compartment->typeLifoAlloc;
}
inline bool
JSContext::ensureGeneratorStackSpace()
{
bool ok = genStack.reserve(genStack.length() + 1);
if (!ok)
js_ReportOutOfMemory(this);
return ok;
}
inline void
JSContext::setPendingException(js::Value v) {
this->throwing = true;
this->exception = v;
js::assertSameCompartment(this, v);
}
inline bool
JSContext::ensureParseMapPool()
{
if (parseMapPool_)
return true;
parseMapPool_ = js::OffTheBooks::new_<js::ParseMapPool>(this);
return parseMapPool_;
}
/* Get the current frame, first lazily instantiating stack frames if needed. */
static inline js::StackFrame *
js_GetTopStackFrame(JSContext *cx, FrameExpandKind expand)
{
#ifdef JS_METHODJIT
if (expand)
js::mjit::ExpandInlineFrames(cx->compartment);
#endif
return cx->maybefp();
}
#endif /* jscntxtinlines_h___ */