https://github.com/mozilla/gecko-dev
Tip revision: 3037046400261c87ba78e114d1700b928b75dea1 authored by ffxbld on 07 October 2014, 14:11:30 UTC
Added FIREFOX_33_0_RELEASE FIREFOX_33_0_BUILD1 tag(s) for changeset 0e0dc4b23c13. DONTBUILD CLOSED TREE a=release
Added FIREFOX_33_0_RELEASE FIREFOX_33_0_BUILD1 tag(s) for changeset 0e0dc4b23c13. DONTBUILD CLOSED TREE a=release
Tip revision: 3037046
jsapi.h
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sts=4 et sw=4 tw=99:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* JavaScript API. */
#ifndef jsapi_h
#define jsapi_h
#include "mozilla/FloatingPoint.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/Range.h"
#include "mozilla/RangedPtr.h"
#include "mozilla/TypedEnum.h"
#include <stdarg.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include "jsalloc.h"
#include "jspubtd.h"
#include "js/CallArgs.h"
#include "js/Class.h"
#include "js/HashTable.h"
#include "js/Id.h"
#include "js/Principals.h"
#include "js/RootingAPI.h"
#include "js/TracingAPI.h"
#include "js/Utility.h"
#include "js/Value.h"
#include "js/Vector.h"
/************************************************************************/
namespace JS {
class Latin1CharsZ;
class TwoByteChars;
#if defined JS_THREADSAFE && defined JS_DEBUG
class JS_PUBLIC_API(AutoCheckRequestDepth)
{
JSContext *cx;
public:
explicit AutoCheckRequestDepth(JSContext *cx);
explicit AutoCheckRequestDepth(js::ContextFriendFields *cx);
~AutoCheckRequestDepth();
};
# define CHECK_REQUEST(cx) \
JS::AutoCheckRequestDepth _autoCheckRequestDepth(cx)
#else
# define CHECK_REQUEST(cx) \
((void) 0)
#endif /* JS_THREADSAFE && JS_DEBUG */
#ifdef JS_DEBUG
/*
* Assert that we're not doing GC on cx, that we're in a request as
* needed, and that the compartments for cx and v are correct.
* Also check that GC would be safe at this point.
*/
JS_PUBLIC_API(void)
AssertArgumentsAreSane(JSContext *cx, JS::HandleValue v);
#else
inline void AssertArgumentsAreSane(JSContext *cx, JS::HandleValue v) {
/* Do nothing */
}
#endif /* JS_DEBUG */
/* AutoValueArray roots an internal fixed-size array of Values. */
template <size_t N>
class AutoValueArray : public AutoGCRooter
{
const size_t length_;
Value elements_[N];
public:
explicit AutoValueArray(JSContext *cx
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: AutoGCRooter(cx, VALARRAY), length_(N)
{
/* Always initialize in case we GC before assignment. */
mozilla::PodArrayZero(elements_);
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
unsigned length() const { return length_; }
const Value *begin() const { return elements_; }
Value *begin() { return elements_; }
HandleValue operator[](unsigned i) const {
JS_ASSERT(i < N);
return HandleValue::fromMarkedLocation(&elements_[i]);
}
MutableHandleValue operator[](unsigned i) {
JS_ASSERT(i < N);
return MutableHandleValue::fromMarkedLocation(&elements_[i]);
}
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
template<class T>
class AutoVectorRooter : protected AutoGCRooter
{
typedef js::Vector<T, 8> VectorImpl;
VectorImpl vector;
public:
explicit AutoVectorRooter(JSContext *cx, ptrdiff_t tag
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: AutoGCRooter(cx, tag), vector(cx)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
explicit AutoVectorRooter(js::ContextFriendFields *cx, ptrdiff_t tag
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: AutoGCRooter(cx, tag), vector(cx)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
typedef T ElementType;
typedef typename VectorImpl::Range Range;
size_t length() const { return vector.length(); }
bool empty() const { return vector.empty(); }
bool append(const T &v) { return vector.append(v); }
bool append(const T *ptr, size_t len) { return vector.append(ptr, len); }
bool appendAll(const AutoVectorRooter<T> &other) {
return vector.appendAll(other.vector);
}
bool insert(T *p, const T &val) { return vector.insert(p, val); }
/* For use when space has already been reserved. */
void infallibleAppend(const T &v) { vector.infallibleAppend(v); }
void popBack() { vector.popBack(); }
T popCopy() { return vector.popCopy(); }
bool growBy(size_t inc) {
size_t oldLength = vector.length();
if (!vector.growByUninitialized(inc))
return false;
makeRangeGCSafe(oldLength);
return true;
}
bool resize(size_t newLength) {
size_t oldLength = vector.length();
if (newLength <= oldLength) {
vector.shrinkBy(oldLength - newLength);
return true;
}
if (!vector.growByUninitialized(newLength - oldLength))
return false;
makeRangeGCSafe(oldLength);
return true;
}
void clear() { vector.clear(); }
bool reserve(size_t newLength) {
return vector.reserve(newLength);
}
JS::MutableHandle<T> operator[](size_t i) {
return JS::MutableHandle<T>::fromMarkedLocation(&vector[i]);
}
JS::Handle<T> operator[](size_t i) const {
return JS::Handle<T>::fromMarkedLocation(&vector[i]);
}
const T *begin() const { return vector.begin(); }
T *begin() { return vector.begin(); }
const T *end() const { return vector.end(); }
T *end() { return vector.end(); }
Range all() { return vector.all(); }
const T &back() const { return vector.back(); }
friend void AutoGCRooter::trace(JSTracer *trc);
private:
void makeRangeGCSafe(size_t oldLength) {
T *t = vector.begin() + oldLength;
for (size_t i = oldLength; i < vector.length(); ++i, ++t)
memset(t, 0, sizeof(T));
}
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
template<class Key, class Value>
class AutoHashMapRooter : protected AutoGCRooter
{
private:
typedef js::HashMap<Key, Value> HashMapImpl;
public:
explicit AutoHashMapRooter(JSContext *cx, ptrdiff_t tag
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: AutoGCRooter(cx, tag), map(cx)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
typedef Key KeyType;
typedef Value ValueType;
typedef typename HashMapImpl::Entry Entry;
typedef typename HashMapImpl::Lookup Lookup;
typedef typename HashMapImpl::Ptr Ptr;
typedef typename HashMapImpl::AddPtr AddPtr;
bool init(uint32_t len = 16) {
return map.init(len);
}
bool initialized() const {
return map.initialized();
}
Ptr lookup(const Lookup &l) const {
return map.lookup(l);
}
void remove(Ptr p) {
map.remove(p);
}
AddPtr lookupForAdd(const Lookup &l) const {
return map.lookupForAdd(l);
}
template<typename KeyInput, typename ValueInput>
bool add(AddPtr &p, const KeyInput &k, const ValueInput &v) {
return map.add(p, k, v);
}
bool add(AddPtr &p, const Key &k) {
return map.add(p, k);
}
template<typename KeyInput, typename ValueInput>
bool relookupOrAdd(AddPtr &p, const KeyInput &k, const ValueInput &v) {
return map.relookupOrAdd(p, k, v);
}
typedef typename HashMapImpl::Range Range;
Range all() const {
return map.all();
}
typedef typename HashMapImpl::Enum Enum;
void clear() {
map.clear();
}
void finish() {
map.finish();
}
bool empty() const {
return map.empty();
}
uint32_t count() const {
return map.count();
}
size_t capacity() const {
return map.capacity();
}
size_t sizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const {
return map.sizeOfExcludingThis(mallocSizeOf);
}
size_t sizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const {
return map.sizeOfIncludingThis(mallocSizeOf);
}
uint32_t generation() const {
return map.generation();
}
/************************************************** Shorthand operations */
bool has(const Lookup &l) const {
return map.has(l);
}
template<typename KeyInput, typename ValueInput>
bool put(const KeyInput &k, const ValueInput &v) {
return map.put(k, v);
}
template<typename KeyInput, typename ValueInput>
bool putNew(const KeyInput &k, const ValueInput &v) {
return map.putNew(k, v);
}
Ptr lookupWithDefault(const Key &k, const Value &defaultValue) {
return map.lookupWithDefault(k, defaultValue);
}
void remove(const Lookup &l) {
map.remove(l);
}
friend void AutoGCRooter::trace(JSTracer *trc);
private:
AutoHashMapRooter(const AutoHashMapRooter &hmr) MOZ_DELETE;
AutoHashMapRooter &operator=(const AutoHashMapRooter &hmr) MOZ_DELETE;
HashMapImpl map;
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
template<class T>
class AutoHashSetRooter : protected AutoGCRooter
{
private:
typedef js::HashSet<T> HashSetImpl;
public:
explicit AutoHashSetRooter(JSContext *cx, ptrdiff_t tag
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: AutoGCRooter(cx, tag), set(cx)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
typedef typename HashSetImpl::Lookup Lookup;
typedef typename HashSetImpl::Ptr Ptr;
typedef typename HashSetImpl::AddPtr AddPtr;
bool init(uint32_t len = 16) {
return set.init(len);
}
bool initialized() const {
return set.initialized();
}
Ptr lookup(const Lookup &l) const {
return set.lookup(l);
}
void remove(Ptr p) {
set.remove(p);
}
AddPtr lookupForAdd(const Lookup &l) const {
return set.lookupForAdd(l);
}
bool add(AddPtr &p, const T &t) {
return set.add(p, t);
}
bool relookupOrAdd(AddPtr &p, const Lookup &l, const T &t) {
return set.relookupOrAdd(p, l, t);
}
typedef typename HashSetImpl::Range Range;
Range all() const {
return set.all();
}
typedef typename HashSetImpl::Enum Enum;
void clear() {
set.clear();
}
void finish() {
set.finish();
}
bool empty() const {
return set.empty();
}
uint32_t count() const {
return set.count();
}
size_t capacity() const {
return set.capacity();
}
size_t sizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const {
return set.sizeOfExcludingThis(mallocSizeOf);
}
size_t sizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const {
return set.sizeOfIncludingThis(mallocSizeOf);
}
uint32_t generation() const {
return set.generation();
}
/************************************************** Shorthand operations */
bool has(const Lookup &l) const {
return set.has(l);
}
bool put(const T &t) {
return set.put(t);
}
bool putNew(const T &t) {
return set.putNew(t);
}
void remove(const Lookup &l) {
set.remove(l);
}
friend void AutoGCRooter::trace(JSTracer *trc);
private:
AutoHashSetRooter(const AutoHashSetRooter &hmr) MOZ_DELETE;
AutoHashSetRooter &operator=(const AutoHashSetRooter &hmr) MOZ_DELETE;
HashSetImpl set;
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
class MOZ_STACK_CLASS AutoValueVector : public AutoVectorRooter<Value>
{
public:
explicit AutoValueVector(JSContext *cx
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: AutoVectorRooter<Value>(cx, VALVECTOR)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
class AutoIdVector : public AutoVectorRooter<jsid>
{
public:
explicit AutoIdVector(JSContext *cx
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: AutoVectorRooter<jsid>(cx, IDVECTOR)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
class AutoObjectVector : public AutoVectorRooter<JSObject *>
{
public:
explicit AutoObjectVector(JSContext *cx
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: AutoVectorRooter<JSObject *>(cx, OBJVECTOR)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
class AutoFunctionVector : public AutoVectorRooter<JSFunction *>
{
public:
explicit AutoFunctionVector(JSContext *cx
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: AutoVectorRooter<JSFunction *>(cx, FUNVECTOR)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
explicit AutoFunctionVector(js::ContextFriendFields *cx
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: AutoVectorRooter<JSFunction *>(cx, FUNVECTOR)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
class AutoScriptVector : public AutoVectorRooter<JSScript *>
{
public:
explicit AutoScriptVector(JSContext *cx
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: AutoVectorRooter<JSScript *>(cx, SCRIPTVECTOR)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
/*
* Custom rooting behavior for internal and external clients.
*/
class JS_PUBLIC_API(CustomAutoRooter) : private AutoGCRooter
{
public:
template <typename CX>
explicit CustomAutoRooter(CX *cx MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: AutoGCRooter(cx, CUSTOM)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
friend void AutoGCRooter::trace(JSTracer *trc);
protected:
/* Supplied by derived class to trace roots. */
virtual void trace(JSTracer *trc) = 0;
private:
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
/*
* RootedGeneric<T> allows a class to instantiate its own Rooted type by
* including the method:
*
* void trace(JSTracer *trc);
*
* The trace() method must trace all of the class's fields.
*/
template <class T>
class RootedGeneric : private CustomAutoRooter
{
public:
template <typename CX>
explicit RootedGeneric(CX *cx MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: CustomAutoRooter(cx)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
template <typename CX>
explicit RootedGeneric(CX *cx, const T& initial MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: CustomAutoRooter(cx), value(initial)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
operator const T&() const { return value; }
T operator->() const { return value; }
private:
virtual void trace(JSTracer *trc) { value->trace(trc); }
T value;
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
/* A handle to an array of rooted values. */
class HandleValueArray
{
const size_t length_;
const Value * const elements_;
HandleValueArray(size_t len, const Value *elements) : length_(len), elements_(elements) {}
public:
explicit HandleValueArray(const RootedValue& value) : length_(1), elements_(value.address()) {}
MOZ_IMPLICIT HandleValueArray(const AutoValueVector& values)
: length_(values.length()), elements_(values.begin()) {}
template <size_t N>
HandleValueArray(const AutoValueArray<N>& values) : length_(N), elements_(values.begin()) {}
/* CallArgs must already be rooted somewhere up the stack. */
MOZ_IMPLICIT HandleValueArray(const JS::CallArgs& args) : length_(args.length()), elements_(args.array()) {}
/* Use with care! Only call this if the data is guaranteed to be marked. */
static HandleValueArray fromMarkedLocation(size_t len, const Value *elements) {
return HandleValueArray(len, elements);
}
static HandleValueArray subarray(const HandleValueArray& values, size_t startIndex, size_t len) {
JS_ASSERT(startIndex + len <= values.length());
return HandleValueArray(len, values.begin() + startIndex);
}
static HandleValueArray empty() {
return HandleValueArray(0, nullptr);
}
size_t length() const { return length_; }
const Value *begin() const { return elements_; }
HandleValue operator[](size_t i) const {
JS_ASSERT(i < length_);
return HandleValue::fromMarkedLocation(&elements_[i]);
}
};
} /* namespace JS */
/************************************************************************/
struct JSFreeOp {
private:
JSRuntime *runtime_;
protected:
explicit JSFreeOp(JSRuntime *rt)
: runtime_(rt) { }
public:
JSRuntime *runtime() const {
return runtime_;
}
};
/* Callbacks and their arguments. */
/************************************************************************/
typedef enum JSContextOp {
JSCONTEXT_NEW,
JSCONTEXT_DESTROY
} JSContextOp;
/*
* The possible values for contextOp when the runtime calls the callback are:
* JSCONTEXT_NEW JS_NewContext successfully created a new JSContext
* instance. The callback can initialize the instance as
* required. If the callback returns false, the instance
* will be destroyed and JS_NewContext returns null. In
* this case the callback is not called again.
* JSCONTEXT_DESTROY One of JS_DestroyContext* methods is called. The
* callback may perform its own cleanup and must always
* return true.
* Any other value For future compatibility the callback must do nothing
* and return true in this case.
*/
typedef bool
(* JSContextCallback)(JSContext *cx, unsigned contextOp, void *data);
typedef enum JSGCStatus {
JSGC_BEGIN,
JSGC_END
} JSGCStatus;
typedef void
(* JSGCCallback)(JSRuntime *rt, JSGCStatus status, void *data);
typedef enum JSFinalizeStatus {
/*
* Called when preparing to sweep a group of compartments, before anything
* has been swept. The collector will not yield to the mutator before
* calling the callback with JSFINALIZE_GROUP_END status.
*/
JSFINALIZE_GROUP_START,
/*
* Called when preparing to sweep a group of compartments. Weak references
* to unmarked things have been removed and things that are not swept
* incrementally have been finalized at this point. The collector may yield
* to the mutator after this point.
*/
JSFINALIZE_GROUP_END,
/*
* Called at the end of collection when everything has been swept.
*/
JSFINALIZE_COLLECTION_END
} JSFinalizeStatus;
typedef void
(* JSFinalizeCallback)(JSFreeOp *fop, JSFinalizeStatus status, bool isCompartment, void *data);
typedef bool
(* JSInterruptCallback)(JSContext *cx);
typedef void
(* JSErrorReporter)(JSContext *cx, const char *message, JSErrorReport *report);
#ifdef MOZ_TRACE_JSCALLS
typedef void
(* JSFunctionCallback)(const JSFunction *fun,
const JSScript *scr,
const JSContext *cx,
int entering);
#endif
/*
* Possible exception types. These types are part of a JSErrorFormatString
* structure. They define which error to throw in case of a runtime error.
* JSEXN_NONE marks an unthrowable error.
*/
typedef enum JSExnType {
JSEXN_NONE = -1,
JSEXN_ERR,
JSEXN_INTERNALERR,
JSEXN_EVALERR,
JSEXN_RANGEERR,
JSEXN_REFERENCEERR,
JSEXN_SYNTAXERR,
JSEXN_TYPEERR,
JSEXN_URIERR,
JSEXN_LIMIT
} JSExnType;
typedef struct JSErrorFormatString {
/* The error format string in ASCII. */
const char *format;
/* The number of arguments to expand in the formatted error message. */
uint16_t argCount;
/* One of the JSExnType constants above. */
int16_t exnType;
} JSErrorFormatString;
typedef const JSErrorFormatString *
(* JSErrorCallback)(void *userRef, const unsigned errorNumber);
typedef bool
(* JSLocaleToUpperCase)(JSContext *cx, JS::HandleString src, JS::MutableHandleValue rval);
typedef bool
(* JSLocaleToLowerCase)(JSContext *cx, JS::HandleString src, JS::MutableHandleValue rval);
typedef bool
(* JSLocaleCompare)(JSContext *cx, JS::HandleString src1, JS::HandleString src2,
JS::MutableHandleValue rval);
typedef bool
(* JSLocaleToUnicode)(JSContext *cx, const char *src, JS::MutableHandleValue rval);
/*
* Callback used to ask the embedding for the cross compartment wrapper handler
* that implements the desired prolicy for this kind of object in the
* destination compartment. |obj| is the object to be wrapped. If |existing| is
* non-nullptr, it will point to an existing wrapper object that should be
* re-used if possible. |existing| is guaranteed to be a cross-compartment
* wrapper with a lazily-defined prototype and the correct global. It is
* guaranteed not to wrap a function.
*/
typedef JSObject *
(* JSWrapObjectCallback)(JSContext *cx, JS::HandleObject existing, JS::HandleObject obj,
JS::HandleObject parent, unsigned flags);
/*
* Callback used by the wrap hook to ask the embedding to prepare an object
* for wrapping in a context. This might include unwrapping other wrappers
* or even finding a more suitable object for the new compartment.
*/
typedef JSObject *
(* JSPreWrapCallback)(JSContext *cx, JS::HandleObject scope, JS::HandleObject obj,
unsigned flags);
struct JSWrapObjectCallbacks
{
JSWrapObjectCallback wrap;
JSPreWrapCallback preWrap;
};
typedef void
(* JSDestroyCompartmentCallback)(JSFreeOp *fop, JSCompartment *compartment);
typedef void
(* JSZoneCallback)(JS::Zone *zone);
typedef void
(* JSCompartmentNameCallback)(JSRuntime *rt, JSCompartment *compartment,
char *buf, size_t bufsize);
/************************************************************************/
static MOZ_ALWAYS_INLINE jsval
JS_NumberValue(double d)
{
int32_t i;
d = JS::CanonicalizeNaN(d);
if (mozilla::NumberIsInt32(d, &i))
return INT_TO_JSVAL(i);
return DOUBLE_TO_JSVAL(d);
}
/************************************************************************/
JS_PUBLIC_API(bool)
JS_StringHasBeenInterned(JSContext *cx, JSString *str);
/*
* Only JSStrings that have been interned via the JSAPI can be turned into
* jsids by API clients.
*
* N.B. if a jsid is backed by a string which has not been interned, that
* string must be appropriately rooted to avoid being collected by the GC.
*/
JS_PUBLIC_API(jsid)
INTERNED_STRING_TO_JSID(JSContext *cx, JSString *str);
namespace JS {
// Container class for passing in script source buffers to the JS engine. This
// not only groups the buffer and length values, it also provides a way to
// optionally pass ownership of the buffer to the JS engine without copying.
// Rules for use:
//
// 1) The data array must be allocated with js_malloc() or js_realloc() if
// ownership is being granted to the SourceBufferHolder.
// 2) If ownership is not given to the SourceBufferHolder, then the memory
// must be kept alive until the JS compilation is complete.
// 3) Any code calling SourceBufferHolder::take() must guarantee to keep the
// memory alive until JS compilation completes. Normally only the JS
// engine should be calling take().
//
// Example use:
//
// size_t length = 512;
// jschar* chars = static_cast<jschar*>(js_malloc(sizeof(jschar) * length));
// JS::SourceBufferHolder srcBuf(chars, length, JS::SourceBufferHolder::GiveOwnership);
// JS::Compile(cx, obj, options, srcBuf);
//
class MOZ_STACK_CLASS SourceBufferHolder MOZ_FINAL
{
public:
enum Ownership {
NoOwnership,
GiveOwnership
};
SourceBufferHolder(const jschar *data, size_t dataLength, Ownership ownership)
: data_(data),
length_(dataLength),
ownsChars_(ownership == GiveOwnership)
{
// Ensure that null buffers properly return an unowned, empty,
// null-terminated string.
static const jschar NullChar_ = 0;
if (!get()) {
data_ = &NullChar_;
length_ = 0;
ownsChars_ = false;
}
}
~SourceBufferHolder() {
if (ownsChars_)
js_free(const_cast<jschar *>(data_));
}
// Access the underlying source buffer without affecting ownership.
const jschar *get() const { return data_; }
// Length of the source buffer in jschars (not bytes)
size_t length() const { return length_; }
// Returns true if the SourceBufferHolder owns the buffer and will free
// it upon destruction. If true, it is legal to call take().
bool ownsChars() const { return ownsChars_; }
// Retrieve and take ownership of the underlying data buffer. The caller
// is now responsible for calling js_free() on the returned value, *but only
// after JS script compilation has completed*.
//
// After the buffer has been taken the SourceBufferHolder functions as if
// it had been constructed on an unowned buffer; get() and length() still
// work. In order for this to be safe the taken buffer must be kept alive
// until after JS script compilation completes as noted above.
//
// Note, it's the caller's responsibility to check ownsChars() before taking
// the buffer. Taking and then free'ing an unowned buffer will have dire
// consequences.
jschar *take() {
JS_ASSERT(ownsChars_);
ownsChars_ = false;
return const_cast<jschar *>(data_);
}
private:
SourceBufferHolder(SourceBufferHolder &) MOZ_DELETE;
SourceBufferHolder &operator=(SourceBufferHolder &) MOZ_DELETE;
const jschar *data_;
size_t length_;
bool ownsChars_;
};
} /* namespace JS */
/************************************************************************/
/* Property attributes, set in JSPropertySpec and passed to API functions. */
#define JSPROP_ENUMERATE 0x01 /* property is visible to for/in loop */
#define JSPROP_READONLY 0x02 /* not settable: assignment is no-op.
This flag is only valid when neither
JSPROP_GETTER nor JSPROP_SETTER is
set. */
#define JSPROP_PERMANENT 0x04 /* property cannot be deleted */
#define JSPROP_NATIVE_ACCESSORS 0x08 /* set in JSPropertyDescriptor.flags
if getters/setters are JSNatives */
#define JSPROP_GETTER 0x10 /* property holds getter function */
#define JSPROP_SETTER 0x20 /* property holds setter function */
#define JSPROP_SHARED 0x40 /* don't allocate a value slot for this
property; don't copy the property on
set of the same-named property in an
object that delegates to a prototype
containing this property */
#define JSPROP_INDEX 0x80 /* name is actually (int) index */
#define JSFUN_STUB_GSOPS 0x200 /* use JS_PropertyStub getter/setter
instead of defaulting to class gsops
for property holding function */
#define JSFUN_CONSTRUCTOR 0x400 /* native that can be called as a ctor */
/*
* Specify a generic native prototype methods, i.e., methods of a class
* prototype that are exposed as static methods taking an extra leading
* argument: the generic |this| parameter.
*
* If you set this flag in a JSFunctionSpec struct's flags initializer, then
* that struct must live at least as long as the native static method object
* created due to this flag by JS_DefineFunctions or JS_InitClass. Typically
* JSFunctionSpec structs are allocated in static arrays.
*/
#define JSFUN_GENERIC_NATIVE 0x800
#define JSFUN_FLAGS_MASK 0xe00 /* | of all the JSFUN_* flags */
/*
* The first call to JS_CallOnce by any thread in a process will call 'func'.
* Later calls to JS_CallOnce with the same JSCallOnceType object will be
* suppressed.
*
* Equivalently: each distinct JSCallOnceType object will allow one JS_CallOnce
* to invoke its JSInitCallback.
*/
extern JS_PUBLIC_API(bool)
JS_CallOnce(JSCallOnceType *once, JSInitCallback func);
/* Microseconds since the epoch, midnight, January 1, 1970 UTC. */
extern JS_PUBLIC_API(int64_t)
JS_Now(void);
/* Don't want to export data, so provide accessors for non-inline jsvals. */
extern JS_PUBLIC_API(jsval)
JS_GetNaNValue(JSContext *cx);
extern JS_PUBLIC_API(jsval)
JS_GetNegativeInfinityValue(JSContext *cx);
extern JS_PUBLIC_API(jsval)
JS_GetPositiveInfinityValue(JSContext *cx);
extern JS_PUBLIC_API(jsval)
JS_GetEmptyStringValue(JSContext *cx);
extern JS_PUBLIC_API(JSString *)
JS_GetEmptyString(JSRuntime *rt);
/*
* Format is a string of the following characters (spaces are insignificant),
* specifying the tabulated type conversions:
*
* b bool Boolean
* c uint16_t/jschar ECMA uint16_t, Unicode char
* i int32_t ECMA int32_t
* j int32_t ECMA int32_t (used to be different)
* u uint32_t ECMA uint32_t
* d double IEEE double
* I double Integral IEEE double
* S JSString * Unicode string, accessed by a JSString pointer
* W jschar * Unicode character vector, 0-terminated (W for wide)
* o JSObject * Object reference
* f JSFunction * Function private
* v jsval Argument value (no conversion)
* * N/A Skip this argument (no vararg)
* / N/A End of required arguments
*
* The variable argument list after format must consist of &b, &c, &s, e.g.,
* where those variables have the types given above. For the pointer types
* char *, JSString *, and JSObject *, the pointed-at memory returned belongs
* to the JS runtime, not to the calling native code. The runtime promises
* to keep this memory valid so long as argv refers to allocated stack space
* (so long as the native function is active).
*
* Fewer arguments than format specifies may be passed only if there is a /
* in format after the last required argument specifier and argc is at least
* the number of required arguments. More arguments than format specifies
* may be passed without error; it is up to the caller to deal with trailing
* unconverted arguments.
*/
extern JS_PUBLIC_API(bool)
JS_ConvertArguments(JSContext *cx, const JS::CallArgs &args, const char *format, ...);
#ifdef va_start
extern JS_PUBLIC_API(bool)
JS_ConvertArgumentsVA(JSContext *cx, const JS::CallArgs &args, const char *format,
va_list ap);
#endif
extern JS_PUBLIC_API(bool)
JS_ConvertValue(JSContext *cx, JS::HandleValue v, JSType type, JS::MutableHandleValue vp);
extern JS_PUBLIC_API(bool)
JS_ValueToObject(JSContext *cx, JS::HandleValue v, JS::MutableHandleObject objp);
extern JS_PUBLIC_API(JSFunction *)
JS_ValueToFunction(JSContext *cx, JS::HandleValue v);
extern JS_PUBLIC_API(JSFunction *)
JS_ValueToConstructor(JSContext *cx, JS::HandleValue v);
extern JS_PUBLIC_API(JSString *)
JS_ValueToSource(JSContext *cx, JS::Handle<JS::Value> v);
namespace js {
/*
* DO NOT CALL THIS. Use JS::ToNumber
*/
extern JS_PUBLIC_API(bool)
ToNumberSlow(JSContext *cx, JS::Value v, double *dp);
/*
* DO NOT CALL THIS. Use JS::ToBoolean
*/
extern JS_PUBLIC_API(bool)
ToBooleanSlow(JS::HandleValue v);
/*
* DO NOT CALL THIS. Use JS::ToString
*/
extern JS_PUBLIC_API(JSString*)
ToStringSlow(JSContext *cx, JS::HandleValue v);
} /* namespace js */
namespace JS {
/* ES5 9.3 ToNumber. */
MOZ_ALWAYS_INLINE bool
ToNumber(JSContext *cx, HandleValue v, double *out)
{
AssertArgumentsAreSane(cx, v);
if (v.isNumber()) {
*out = v.toNumber();
return true;
}
return js::ToNumberSlow(cx, v, out);
}
MOZ_ALWAYS_INLINE bool
ToBoolean(HandleValue v)
{
if (v.isBoolean())
return v.toBoolean();
if (v.isInt32())
return v.toInt32() != 0;
if (v.isNullOrUndefined())
return false;
if (v.isDouble()) {
double d = v.toDouble();
return !mozilla::IsNaN(d) && d != 0;
}
if (v.isSymbol())
return true;
/* The slow path handles strings and objects. */
return js::ToBooleanSlow(v);
}
MOZ_ALWAYS_INLINE JSString*
ToString(JSContext *cx, HandleValue v)
{
if (v.isString())
return v.toString();
return js::ToStringSlow(cx, v);
}
} /* namespace JS */
extern JS_PUBLIC_API(bool)
JS_DoubleIsInt32(double d, int32_t *ip);
extern JS_PUBLIC_API(int32_t)
JS_DoubleToInt32(double d);
extern JS_PUBLIC_API(uint32_t)
JS_DoubleToUint32(double d);
namespace js {
/* DO NOT CALL THIS. Use JS::ToUint16. */
extern JS_PUBLIC_API(bool)
ToUint16Slow(JSContext *cx, JS::HandleValue v, uint16_t *out);
/* DO NOT CALL THIS. Use JS::ToInt32. */
extern JS_PUBLIC_API(bool)
ToInt32Slow(JSContext *cx, JS::HandleValue v, int32_t *out);
/* DO NOT CALL THIS. Use JS::ToUint32. */
extern JS_PUBLIC_API(bool)
ToUint32Slow(JSContext *cx, JS::HandleValue v, uint32_t *out);
/* DO NOT CALL THIS. Use JS::ToInt64. */
extern JS_PUBLIC_API(bool)
ToInt64Slow(JSContext *cx, JS::HandleValue v, int64_t *out);
/* DO NOT CALL THIS. Use JS::ToUint64. */
extern JS_PUBLIC_API(bool)
ToUint64Slow(JSContext *cx, JS::HandleValue v, uint64_t *out);
} /* namespace js */
namespace JS {
MOZ_ALWAYS_INLINE bool
ToUint16(JSContext *cx, JS::HandleValue v, uint16_t *out)
{
AssertArgumentsAreSane(cx, v);
if (v.isInt32()) {
*out = uint16_t(v.toInt32());
return true;
}
return js::ToUint16Slow(cx, v, out);
}
MOZ_ALWAYS_INLINE bool
ToInt32(JSContext *cx, JS::HandleValue v, int32_t *out)
{
AssertArgumentsAreSane(cx, v);
if (v.isInt32()) {
*out = v.toInt32();
return true;
}
return js::ToInt32Slow(cx, v, out);
}
MOZ_ALWAYS_INLINE bool
ToUint32(JSContext *cx, JS::HandleValue v, uint32_t *out)
{
AssertArgumentsAreSane(cx, v);
if (v.isInt32()) {
*out = uint32_t(v.toInt32());
return true;
}
return js::ToUint32Slow(cx, v, out);
}
MOZ_ALWAYS_INLINE bool
ToInt64(JSContext *cx, JS::HandleValue v, int64_t *out)
{
AssertArgumentsAreSane(cx, v);
if (v.isInt32()) {
*out = int64_t(v.toInt32());
return true;
}
return js::ToInt64Slow(cx, v, out);
}
MOZ_ALWAYS_INLINE bool
ToUint64(JSContext *cx, JS::HandleValue v, uint64_t *out)
{
AssertArgumentsAreSane(cx, v);
if (v.isInt32()) {
/* Account for sign extension of negatives into the longer 64bit space. */
*out = uint64_t(int64_t(v.toInt32()));
return true;
}
return js::ToUint64Slow(cx, v, out);
}
} /* namespace JS */
extern JS_PUBLIC_API(JSType)
JS_TypeOfValue(JSContext *cx, JS::Handle<JS::Value> v);
extern JS_PUBLIC_API(const char *)
JS_GetTypeName(JSContext *cx, JSType type);
extern JS_PUBLIC_API(bool)
JS_StrictlyEqual(JSContext *cx, jsval v1, jsval v2, bool *equal);
extern JS_PUBLIC_API(bool)
JS_LooselyEqual(JSContext *cx, JS::Handle<JS::Value> v1, JS::Handle<JS::Value> v2, bool *equal);
extern JS_PUBLIC_API(bool)
JS_SameValue(JSContext *cx, jsval v1, jsval v2, bool *same);
/* True iff fun is the global eval function. */
extern JS_PUBLIC_API(bool)
JS_IsBuiltinEvalFunction(JSFunction *fun);
/* True iff fun is the Function constructor. */
extern JS_PUBLIC_API(bool)
JS_IsBuiltinFunctionConstructor(JSFunction *fun);
/************************************************************************/
/*
* Initialization, locking, contexts, and memory allocation.
*
* It is important that the first runtime and first context be created in a
* single-threaded fashion, otherwise the behavior of the library is undefined.
* See: http://developer.mozilla.org/en/docs/Category:JSAPI_Reference
*/
/**
* Initialize SpiderMonkey, returning true only if initialization succeeded.
* Once this method has succeeded, it is safe to call JS_NewRuntime and other
* JSAPI methods.
*
* This method must be called before any other JSAPI method is used on any
* thread. Once it has been used, it is safe to call any JSAPI method, and it
* remains safe to do so until JS_ShutDown is correctly called.
*
* It is currently not possible to initialize SpiderMonkey multiple times (that
* is, calling JS_Init/JSAPI methods/JS_ShutDown in that order, then doing so
* again). This restriction may eventually be lifted.
*/
extern JS_PUBLIC_API(bool)
JS_Init(void);
/**
* Destroy free-standing resources allocated by SpiderMonkey, not associated
* with any runtime, context, or other structure.
*
* This method should be called after all other JSAPI data has been properly
* cleaned up: every new runtime must have been destroyed, every new context
* must have been destroyed, and so on. Calling this method before all other
* resources have been destroyed has undefined behavior.
*
* Failure to call this method, at present, has no adverse effects other than
* leaking memory. This may not always be the case; it's recommended that all
* embedders call this method when all other JSAPI operations have completed.
*
* It is currently not possible to initialize SpiderMonkey multiple times (that
* is, calling JS_Init/JSAPI methods/JS_ShutDown in that order, then doing so
* again). This restriction may eventually be lifted.
*/
extern JS_PUBLIC_API(void)
JS_ShutDown(void);
extern JS_PUBLIC_API(JSRuntime *)
JS_NewRuntime(uint32_t maxbytes,
uint32_t maxNurseryBytes = JS::DefaultNurseryBytes,
JSRuntime *parentRuntime = nullptr);
extern JS_PUBLIC_API(void)
JS_DestroyRuntime(JSRuntime *rt);
// These are equivalent to ICU's |UMemAllocFn|, |UMemReallocFn|, and
// |UMemFreeFn| types. The first argument (called |context| in the ICU docs)
// will always be nullptr, and should be ignored.
typedef void *(*JS_ICUAllocFn)(const void *, size_t size);
typedef void *(*JS_ICUReallocFn)(const void *, void *p, size_t size);
typedef void (*JS_ICUFreeFn)(const void *, void *p);
// This function can be used to track memory used by ICU.
// Do not use it unless you know what you are doing!
extern JS_PUBLIC_API(bool)
JS_SetICUMemoryFunctions(JS_ICUAllocFn allocFn, JS_ICUReallocFn reallocFn, JS_ICUFreeFn freeFn);
JS_PUBLIC_API(void *)
JS_GetRuntimePrivate(JSRuntime *rt);
extern JS_PUBLIC_API(JSRuntime *)
JS_GetRuntime(JSContext *cx);
extern JS_PUBLIC_API(JSRuntime *)
JS_GetParentRuntime(JSContext *cx);
JS_PUBLIC_API(void)
JS_SetRuntimePrivate(JSRuntime *rt, void *data);
extern JS_PUBLIC_API(void)
JS_BeginRequest(JSContext *cx);
extern JS_PUBLIC_API(void)
JS_EndRequest(JSContext *cx);
extern JS_PUBLIC_API(bool)
JS_IsInRequest(JSRuntime *rt);
namespace js {
void
AssertHeapIsIdle(JSRuntime *rt);
void
AssertHeapIsIdle(JSContext *cx);
} /* namespace js */
class JSAutoRequest
{
public:
explicit JSAutoRequest(JSContext *cx
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: mContext(cx)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
JS_BeginRequest(mContext);
}
~JSAutoRequest() {
JS_EndRequest(mContext);
}
protected:
JSContext *mContext;
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
#if 0
private:
static void *operator new(size_t) CPP_THROW_NEW { return 0; };
static void operator delete(void *, size_t) { };
#endif
};
class JSAutoCheckRequest
{
public:
explicit JSAutoCheckRequest(JSContext *cx
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
{
#if defined JS_THREADSAFE && defined JS_DEBUG
mContext = cx;
JS_ASSERT(JS_IsInRequest(JS_GetRuntime(cx)));
#endif
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
~JSAutoCheckRequest() {
#if defined JS_THREADSAFE && defined JS_DEBUG
JS_ASSERT(JS_IsInRequest(JS_GetRuntime(mContext)));
#endif
}
private:
#if defined JS_THREADSAFE && defined JS_DEBUG
JSContext *mContext;
#endif
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
extern JS_PUBLIC_API(void)
JS_SetContextCallback(JSRuntime *rt, JSContextCallback cxCallback, void *data);
extern JS_PUBLIC_API(JSContext *)
JS_NewContext(JSRuntime *rt, size_t stackChunkSize);
extern JS_PUBLIC_API(void)
JS_DestroyContext(JSContext *cx);
extern JS_PUBLIC_API(void)
JS_DestroyContextNoGC(JSContext *cx);
extern JS_PUBLIC_API(void *)
JS_GetContextPrivate(JSContext *cx);
extern JS_PUBLIC_API(void)
JS_SetContextPrivate(JSContext *cx, void *data);
extern JS_PUBLIC_API(void *)
JS_GetSecondContextPrivate(JSContext *cx);
extern JS_PUBLIC_API(void)
JS_SetSecondContextPrivate(JSContext *cx, void *data);
extern JS_PUBLIC_API(JSRuntime *)
JS_GetRuntime(JSContext *cx);
extern JS_PUBLIC_API(JSContext *)
JS_ContextIterator(JSRuntime *rt, JSContext **iterp);
extern JS_PUBLIC_API(JSVersion)
JS_GetVersion(JSContext *cx);
// Mutate the version on the compartment. This is generally discouraged, but
// necessary to support the version mutation in the js and xpc shell command
// set.
//
// It would be nice to put this in jsfriendapi, but the linkage requirements
// of the shells make that impossible.
JS_PUBLIC_API(void)
JS_SetVersionForCompartment(JSCompartment *compartment, JSVersion version);
extern JS_PUBLIC_API(const char *)
JS_VersionToString(JSVersion version);
extern JS_PUBLIC_API(JSVersion)
JS_StringToVersion(const char *string);
namespace JS {
class JS_PUBLIC_API(RuntimeOptions) {
public:
RuntimeOptions()
: baseline_(false),
ion_(false),
asmJS_(false),
nativeRegExp_(false),
werror_(false),
strictMode_(false),
varObjFix_(false)
{
}
bool baseline() const { return baseline_; }
RuntimeOptions &setBaseline(bool flag) {
baseline_ = flag;
return *this;
}
RuntimeOptions &toggleBaseline() {
baseline_ = !baseline_;
return *this;
}
bool ion() const { return ion_; }
RuntimeOptions &setIon(bool flag) {
ion_ = flag;
return *this;
}
RuntimeOptions &toggleIon() {
ion_ = !ion_;
return *this;
}
bool asmJS() const { return asmJS_; }
RuntimeOptions &setAsmJS(bool flag) {
asmJS_ = flag;
return *this;
}
RuntimeOptions &toggleAsmJS() {
asmJS_ = !asmJS_;
return *this;
}
bool nativeRegExp() const { return nativeRegExp_; }
RuntimeOptions &setNativeRegExp(bool flag) {
nativeRegExp_ = flag;
return *this;
}
bool werror() const { return werror_; }
RuntimeOptions &setWerror(bool flag) {
werror_ = flag;
return *this;
}
RuntimeOptions &toggleWerror() {
werror_ = !werror_;
return *this;
}
bool strictMode() const { return strictMode_; }
RuntimeOptions &setStrictMode(bool flag) {
strictMode_ = flag;
return *this;
}
RuntimeOptions &toggleStrictMode() {
strictMode_ = !strictMode_;
return *this;
}
bool varObjFix() const { return varObjFix_; }
RuntimeOptions &setVarObjFix(bool flag) {
varObjFix_ = flag;
return *this;
}
RuntimeOptions &toggleVarObjFix() {
varObjFix_ = !varObjFix_;
return *this;
}
private:
bool baseline_ : 1;
bool ion_ : 1;
bool asmJS_ : 1;
bool nativeRegExp_ : 1;
bool werror_ : 1;
bool strictMode_ : 1;
bool varObjFix_ : 1;
};
JS_PUBLIC_API(RuntimeOptions &)
RuntimeOptionsRef(JSRuntime *rt);
JS_PUBLIC_API(RuntimeOptions &)
RuntimeOptionsRef(JSContext *cx);
class JS_PUBLIC_API(ContextOptions) {
public:
ContextOptions()
: extraWarnings_(false),
privateIsNSISupports_(false),
dontReportUncaught_(false),
noDefaultCompartmentObject_(false),
noScriptRval_(false)
{
}
bool extraWarnings() const { return extraWarnings_; }
ContextOptions &setExtraWarnings(bool flag) {
extraWarnings_ = flag;
return *this;
}
ContextOptions &toggleExtraWarnings() {
extraWarnings_ = !extraWarnings_;
return *this;
}
bool privateIsNSISupports() const { return privateIsNSISupports_; }
ContextOptions &setPrivateIsNSISupports(bool flag) {
privateIsNSISupports_ = flag;
return *this;
}
ContextOptions &togglePrivateIsNSISupports() {
privateIsNSISupports_ = !privateIsNSISupports_;
return *this;
}
bool dontReportUncaught() const { return dontReportUncaught_; }
ContextOptions &setDontReportUncaught(bool flag) {
dontReportUncaught_ = flag;
return *this;
}
ContextOptions &toggleDontReportUncaught() {
dontReportUncaught_ = !dontReportUncaught_;
return *this;
}
bool noDefaultCompartmentObject() const { return noDefaultCompartmentObject_; }
ContextOptions &setNoDefaultCompartmentObject(bool flag) {
noDefaultCompartmentObject_ = flag;
return *this;
}
ContextOptions &toggleNoDefaultCompartmentObject() {
noDefaultCompartmentObject_ = !noDefaultCompartmentObject_;
return *this;
}
bool noScriptRval() const { return noScriptRval_; }
ContextOptions &setNoScriptRval(bool flag) {
noScriptRval_ = flag;
return *this;
}
ContextOptions &toggleNoScriptRval() {
noScriptRval_ = !noScriptRval_;
return *this;
}
private:
bool extraWarnings_ : 1;
bool privateIsNSISupports_ : 1;
bool dontReportUncaught_ : 1;
bool noDefaultCompartmentObject_ : 1;
bool noScriptRval_ : 1;
};
JS_PUBLIC_API(ContextOptions &)
ContextOptionsRef(JSContext *cx);
class JS_PUBLIC_API(AutoSaveContextOptions) {
public:
explicit AutoSaveContextOptions(JSContext *cx)
: cx_(cx),
oldOptions_(ContextOptionsRef(cx_))
{
}
~AutoSaveContextOptions()
{
ContextOptionsRef(cx_) = oldOptions_;
}
private:
JSContext *cx_;
JS::ContextOptions oldOptions_;
};
} /* namespace JS */
extern JS_PUBLIC_API(const char *)
JS_GetImplementationVersion(void);
extern JS_PUBLIC_API(void)
JS_SetDestroyCompartmentCallback(JSRuntime *rt, JSDestroyCompartmentCallback callback);
extern JS_PUBLIC_API(void)
JS_SetDestroyZoneCallback(JSRuntime *rt, JSZoneCallback callback);
extern JS_PUBLIC_API(void)
JS_SetSweepZoneCallback(JSRuntime *rt, JSZoneCallback callback);
extern JS_PUBLIC_API(void)
JS_SetCompartmentNameCallback(JSRuntime *rt, JSCompartmentNameCallback callback);
extern JS_PUBLIC_API(void)
JS_SetWrapObjectCallbacks(JSRuntime *rt, const JSWrapObjectCallbacks *callbacks);
extern JS_PUBLIC_API(void)
JS_SetCompartmentPrivate(JSCompartment *compartment, void *data);
extern JS_PUBLIC_API(void *)
JS_GetCompartmentPrivate(JSCompartment *compartment);
extern JS_PUBLIC_API(void)
JS_SetZoneUserData(JS::Zone *zone, void *data);
extern JS_PUBLIC_API(void *)
JS_GetZoneUserData(JS::Zone *zone);
extern JS_PUBLIC_API(bool)
JS_WrapObject(JSContext *cx, JS::MutableHandleObject objp);
extern JS_PUBLIC_API(bool)
JS_WrapValue(JSContext *cx, JS::MutableHandleValue vp);
extern JS_PUBLIC_API(JSObject *)
JS_TransplantObject(JSContext *cx, JS::HandleObject origobj, JS::HandleObject target);
extern JS_PUBLIC_API(bool)
JS_RefreshCrossCompartmentWrappers(JSContext *cx, JS::Handle<JSObject*> obj);
/*
* At any time, a JSContext has a current (possibly-nullptr) compartment.
* Compartments are described in:
*
* developer.mozilla.org/en-US/docs/SpiderMonkey/SpiderMonkey_compartments
*
* The current compartment of a context may be changed. The preferred way to do
* this is with JSAutoCompartment:
*
* void foo(JSContext *cx, JSObject *obj) {
* // in some compartment 'c'
* {
* JSAutoCompartment ac(cx, obj); // constructor enters
* // in the compartment of 'obj'
* } // destructor leaves
* // back in compartment 'c'
* }
*
* For more complicated uses that don't neatly fit in a C++ stack frame, the
* compartment can entered and left using separate function calls:
*
* void foo(JSContext *cx, JSObject *obj) {
* // in 'oldCompartment'
* JSCompartment *oldCompartment = JS_EnterCompartment(cx, obj);
* // in the compartment of 'obj'
* JS_LeaveCompartment(cx, oldCompartment);
* // back in 'oldCompartment'
* }
*
* Note: these calls must still execute in a LIFO manner w.r.t all other
* enter/leave calls on the context. Furthermore, only the return value of a
* JS_EnterCompartment call may be passed as the 'oldCompartment' argument of
* the corresponding JS_LeaveCompartment call.
*/
class JS_PUBLIC_API(JSAutoCompartment)
{
JSContext *cx_;
JSCompartment *oldCompartment_;
public:
JSAutoCompartment(JSContext *cx, JSObject *target);
JSAutoCompartment(JSContext *cx, JSScript *target);
~JSAutoCompartment();
};
class JS_PUBLIC_API(JSAutoNullableCompartment)
{
JSContext *cx_;
JSCompartment *oldCompartment_;
public:
explicit JSAutoNullableCompartment(JSContext *cx, JSObject *targetOrNull);
~JSAutoNullableCompartment();
};
/* NB: This API is infallible; a nullptr return value does not indicate error. */
extern JS_PUBLIC_API(JSCompartment *)
JS_EnterCompartment(JSContext *cx, JSObject *target);
extern JS_PUBLIC_API(void)
JS_LeaveCompartment(JSContext *cx, JSCompartment *oldCompartment);
typedef void (*JSIterateCompartmentCallback)(JSRuntime *rt, void *data, JSCompartment *compartment);
/*
* This function calls |compartmentCallback| on every compartment. Beware that
* there is no guarantee that the compartment will survive after the callback
* returns.
*/
extern JS_PUBLIC_API(void)
JS_IterateCompartments(JSRuntime *rt, void *data,
JSIterateCompartmentCallback compartmentCallback);
/*
* Initialize standard JS class constructors, prototypes, and any top-level
* functions and constants associated with the standard classes (e.g. isNaN
* for Number).
*
* NB: This sets cx's global object to obj if it was null.
*/
extern JS_PUBLIC_API(bool)
JS_InitStandardClasses(JSContext *cx, JS::Handle<JSObject*> obj);
/*
* Resolve id, which must contain either a string or an int, to a standard
* class name in obj if possible, defining the class's constructor and/or
* prototype and storing true in *resolved. If id does not name a standard
* class or a top-level property induced by initializing a standard class,
* store false in *resolved and just return true. Return false on error,
* as usual for bool result-typed API entry points.
*
* This API can be called directly from a global object class's resolve op,
* to define standard classes lazily. The class's enumerate op should call
* JS_EnumerateStandardClasses(cx, obj), to define eagerly during for..in
* loops any classes not yet resolved lazily.
*/
extern JS_PUBLIC_API(bool)
JS_ResolveStandardClass(JSContext *cx, JS::HandleObject obj, JS::HandleId id, bool *resolved);
extern JS_PUBLIC_API(bool)
JS_EnumerateStandardClasses(JSContext *cx, JS::HandleObject obj);
extern JS_PUBLIC_API(bool)
JS_GetClassObject(JSContext *cx, JSProtoKey key, JS::MutableHandle<JSObject*> objp);
extern JS_PUBLIC_API(bool)
JS_GetClassPrototype(JSContext *cx, JSProtoKey key, JS::MutableHandle<JSObject*> objp);
namespace JS {
/*
* Determine if the given object is an instance/prototype/constructor for a standard
* class. If so, return the associated JSProtoKey. If not, return JSProto_Null.
*/
extern JS_PUBLIC_API(JSProtoKey)
IdentifyStandardInstance(JSObject *obj);
extern JS_PUBLIC_API(JSProtoKey)
IdentifyStandardPrototype(JSObject *obj);
extern JS_PUBLIC_API(JSProtoKey)
IdentifyStandardInstanceOrPrototype(JSObject *obj);
extern JS_PUBLIC_API(JSProtoKey)
IdentifyStandardConstructor(JSObject *obj);
extern JS_PUBLIC_API(void)
ProtoKeyToId(JSContext *cx, JSProtoKey key, JS::MutableHandleId idp);
} /* namespace JS */
extern JS_PUBLIC_API(JSProtoKey)
JS_IdToProtoKey(JSContext *cx, JS::HandleId id);
/*
* Returns the original value of |Function.prototype| from the global object in
* which |forObj| was created.
*/
extern JS_PUBLIC_API(JSObject *)
JS_GetFunctionPrototype(JSContext *cx, JS::HandleObject forObj);
/*
* Returns the original value of |Object.prototype| from the global object in
* which |forObj| was created.
*/
extern JS_PUBLIC_API(JSObject *)
JS_GetObjectPrototype(JSContext *cx, JS::HandleObject forObj);
/*
* Returns the original value of |Array.prototype| from the global object in
* which |forObj| was created.
*/
extern JS_PUBLIC_API(JSObject *)
JS_GetArrayPrototype(JSContext *cx, JS::HandleObject forObj);
/*
* Returns the original value of |Error.prototype| from the global
* object of the current compartment of cx.
*/
extern JS_PUBLIC_API(JSObject *)
JS_GetErrorPrototype(JSContext *cx);
extern JS_PUBLIC_API(JSObject *)
JS_GetGlobalForObject(JSContext *cx, JSObject *obj);
extern JS_PUBLIC_API(bool)
JS_IsGlobalObject(JSObject *obj);
/*
* May return nullptr, if |c| never had a global (e.g. the atoms compartment),
* or if |c|'s global has been collected.
*/
extern JS_PUBLIC_API(JSObject *)
JS_GetGlobalForCompartmentOrNull(JSContext *cx, JSCompartment *c);
namespace JS {
extern JS_PUBLIC_API(JSObject *)
CurrentGlobalOrNull(JSContext *cx);
}
/*
* Initialize the 'Reflect' object on a global object.
*/
extern JS_PUBLIC_API(JSObject *)
JS_InitReflect(JSContext *cx, JS::HandleObject global);
#ifdef JS_HAS_CTYPES
/*
* Initialize the 'ctypes' object on a global variable 'obj'. The 'ctypes'
* object will be sealed.
*/
extern JS_PUBLIC_API(bool)
JS_InitCTypesClass(JSContext *cx, JS::HandleObject global);
/*
* Convert a unicode string 'source' of length 'slen' to the platform native
* charset, returning a null-terminated string allocated with JS_malloc. On
* failure, this function should report an error.
*/
typedef char *
(* JSCTypesUnicodeToNativeFun)(JSContext *cx, const jschar *source, size_t slen);
/*
* Set of function pointers that ctypes can use for various internal functions.
* See JS_SetCTypesCallbacks below. Providing nullptr for a function is safe,
* and will result in the applicable ctypes functionality not being available.
*/
struct JSCTypesCallbacks {
JSCTypesUnicodeToNativeFun unicodeToNative;
};
typedef struct JSCTypesCallbacks JSCTypesCallbacks;
/*
* Set the callbacks on the provided 'ctypesObj' object. 'callbacks' should be a
* pointer to static data that exists for the lifetime of 'ctypesObj', but it
* may safely be altered after calling this function and without having
* to call this function again.
*/
extern JS_PUBLIC_API(void)
JS_SetCTypesCallbacks(JSObject *ctypesObj, JSCTypesCallbacks *callbacks);
#endif
typedef bool
(* JSEnumerateDiagnosticMemoryCallback)(void *ptr, size_t length);
/*
* Enumerate memory regions that contain diagnostic information
* intended to be included in crash report minidumps.
*/
extern JS_PUBLIC_API(void)
JS_EnumerateDiagnosticMemoryRegions(JSEnumerateDiagnosticMemoryCallback callback);
extern JS_PUBLIC_API(void *)
JS_malloc(JSContext *cx, size_t nbytes);
extern JS_PUBLIC_API(void *)
JS_realloc(JSContext *cx, void *p, size_t nbytes);
/*
* A wrapper for js_free(p) that may delay js_free(p) invocation as a
* performance optimization.
* cx may be nullptr.
*/
extern JS_PUBLIC_API(void)
JS_free(JSContext *cx, void *p);
/*
* A wrapper for js_free(p) that may delay js_free(p) invocation as a
* performance optimization as specified by the given JSFreeOp instance.
*/
extern JS_PUBLIC_API(void)
JS_freeop(JSFreeOp *fop, void *p);
extern JS_PUBLIC_API(JSFreeOp *)
JS_GetDefaultFreeOp(JSRuntime *rt);
extern JS_PUBLIC_API(void)
JS_updateMallocCounter(JSContext *cx, size_t nbytes);
extern JS_PUBLIC_API(char *)
JS_strdup(JSContext *cx, const char *s);
/* Duplicate a string. Does not report an error on failure. */
extern JS_PUBLIC_API(char *)
JS_strdup(JSRuntime *rt, const char *s);
namespace JS {
/*
* A GC root is a pointer to a jsval, JSObject * or JSString * that itself
* points into the GC heap. JS_AddValueRoot takes a pointer to a jsval and
* JS_AddGCThingRoot takes a pointer to a JSObject * or JString *.
*
* Note that, since JS_Add*Root stores the address of a variable (of type
* jsval, JSString *, or JSObject *), that variable must live until
* JS_Remove*Root is called to remove that variable. For example, after:
*
* void some_function() {
* jsval v;
* JS_AddNamedValueRoot(cx, &v, "name");
*
* the caller must perform
*
* JS_RemoveValueRoot(cx, &v);
*
* before some_function() returns.
*
* Also, use JS_AddNamed*Root(cx, &structPtr->memberObj, "structPtr->memberObj")
* in preference to JS_Add*Root(cx, &structPtr->memberObj), in order to identify
* roots by their source callsites. This way, you can find the callsite while
* debugging if you should fail to do JS_Remove*Root(cx, &structPtr->memberObj)
* before freeing structPtr's memory.
*/
extern JS_PUBLIC_API(bool)
AddValueRoot(JSContext *cx, JS::Heap<JS::Value> *vp);
extern JS_PUBLIC_API(bool)
AddStringRoot(JSContext *cx, JS::Heap<JSString *> *rp);
extern JS_PUBLIC_API(bool)
AddObjectRoot(JSContext *cx, JS::Heap<JSObject *> *rp);
extern JS_PUBLIC_API(bool)
AddNamedValueRoot(JSContext *cx, JS::Heap<JS::Value> *vp, const char *name);
extern JS_PUBLIC_API(bool)
AddNamedValueRootRT(JSRuntime *rt, JS::Heap<JS::Value> *vp, const char *name);
extern JS_PUBLIC_API(bool)
AddNamedStringRoot(JSContext *cx, JS::Heap<JSString *> *rp, const char *name);
extern JS_PUBLIC_API(bool)
AddNamedObjectRoot(JSContext *cx, JS::Heap<JSObject *> *rp, const char *name);
extern JS_PUBLIC_API(bool)
AddNamedScriptRoot(JSContext *cx, JS::Heap<JSScript *> *rp, const char *name);
extern JS_PUBLIC_API(void)
RemoveValueRoot(JSContext *cx, JS::Heap<JS::Value> *vp);
extern JS_PUBLIC_API(void)
RemoveStringRoot(JSContext *cx, JS::Heap<JSString *> *rp);
extern JS_PUBLIC_API(void)
RemoveObjectRoot(JSContext *cx, JS::Heap<JSObject *> *rp);
extern JS_PUBLIC_API(void)
RemoveScriptRoot(JSContext *cx, JS::Heap<JSScript *> *rp);
extern JS_PUBLIC_API(void)
RemoveValueRootRT(JSRuntime *rt, JS::Heap<JS::Value> *vp);
extern JS_PUBLIC_API(void)
RemoveStringRootRT(JSRuntime *rt, JS::Heap<JSString *> *rp);
extern JS_PUBLIC_API(void)
RemoveObjectRootRT(JSRuntime *rt, JS::Heap<JSObject *> *rp);
extern JS_PUBLIC_API(void)
RemoveScriptRootRT(JSRuntime *rt, JS::Heap<JSScript *> *rp);
} /* namespace JS */
/*
* Register externally maintained GC roots.
*
* traceOp: the trace operation. For each root the implementation should call
* JS_CallTracer whenever the root contains a traceable thing.
* data: the data argument to pass to each invocation of traceOp.
*/
extern JS_PUBLIC_API(bool)
JS_AddExtraGCRootsTracer(JSRuntime *rt, JSTraceDataOp traceOp, void *data);
/* Undo a call to JS_AddExtraGCRootsTracer. */
extern JS_PUBLIC_API(void)
JS_RemoveExtraGCRootsTracer(JSRuntime *rt, JSTraceDataOp traceOp, void *data);
#ifdef JS_DEBUG
/*
* Debug-only method to dump the object graph of heap-allocated things.
*
* fp: file for the dump output.
* start: when non-null, dump only things reachable from start
* thing. Otherwise dump all things reachable from the
* runtime roots.
* startKind: trace kind of start if start is not null. Must be
* JSTRACE_OBJECT when start is null.
* thingToFind: dump only paths in the object graph leading to thingToFind
* when non-null.
* maxDepth: the upper bound on the number of edges to descend from the
* graph roots.
* thingToIgnore: thing to ignore during the graph traversal when non-null.
*/
extern JS_PUBLIC_API(bool)
JS_DumpHeap(JSRuntime *rt, FILE *fp, void* startThing, JSGCTraceKind kind,
void *thingToFind, size_t maxDepth, void *thingToIgnore);
#endif
/*
* Garbage collector API.
*/
extern JS_PUBLIC_API(void)
JS_GC(JSRuntime *rt);
extern JS_PUBLIC_API(void)
JS_MaybeGC(JSContext *cx);
extern JS_PUBLIC_API(void)
JS_SetGCCallback(JSRuntime *rt, JSGCCallback cb, void *data);
extern JS_PUBLIC_API(bool)
JS_AddFinalizeCallback(JSRuntime *rt, JSFinalizeCallback cb, void *data);
extern JS_PUBLIC_API(void)
JS_RemoveFinalizeCallback(JSRuntime *rt, JSFinalizeCallback cb);
extern JS_PUBLIC_API(bool)
JS_IsGCMarkingTracer(JSTracer *trc);
/* For assertions only. */
#ifdef JS_DEBUG
extern JS_PUBLIC_API(bool)
JS_IsMarkingGray(JSTracer *trc);
#endif
/*
* JS_IsAboutToBeFinalized checks if the given object is going to be finalized
* at the end of the current GC. When called outside of the context of a GC,
* this function will return false. Typically this function is used on weak
* references, where the reference should be nulled out or destroyed if the
* given object is about to be finalized.
*
* The argument to JS_IsAboutToBeFinalized is an in-out param: when the
* function returns false, the object being referenced is still alive, but the
* garbage collector might have moved it. In this case, the reference passed
* to JS_IsAboutToBeFinalized will be updated to the object's new location.
* Callers of this method are responsible for updating any state that is
* dependent on the object's address. For example, if the object's address is
* used as a key in a hashtable, then the object must be removed and
* re-inserted with the correct hash.
*/
extern JS_PUBLIC_API(bool)
JS_IsAboutToBeFinalized(JS::Heap<JSObject *> *objp);
extern JS_PUBLIC_API(bool)
JS_IsAboutToBeFinalizedUnbarriered(JSObject **objp);
typedef enum JSGCParamKey {
/* Maximum nominal heap before last ditch GC. */
JSGC_MAX_BYTES = 0,
/* Number of JS_malloc bytes before last ditch GC. */
JSGC_MAX_MALLOC_BYTES = 1,
/* Amount of bytes allocated by the GC. */
JSGC_BYTES = 3,
/* Number of times when GC was invoked. */
JSGC_NUMBER = 4,
/* Max size of the code cache in bytes. */
JSGC_MAX_CODE_CACHE_BYTES = 5,
/* Select GC mode. */
JSGC_MODE = 6,
/* Number of cached empty GC chunks. */
JSGC_UNUSED_CHUNKS = 7,
/* Total number of allocated GC chunks. */
JSGC_TOTAL_CHUNKS = 8,
/* Max milliseconds to spend in an incremental GC slice. */
JSGC_SLICE_TIME_BUDGET = 9,
/* Maximum size the GC mark stack can grow to. */
JSGC_MARK_STACK_LIMIT = 10,
/*
* GCs less than this far apart in time will be considered 'high-frequency GCs'.
* See setGCLastBytes in jsgc.cpp.
*/
JSGC_HIGH_FREQUENCY_TIME_LIMIT = 11,
/* Start of dynamic heap growth. */
JSGC_HIGH_FREQUENCY_LOW_LIMIT = 12,
/* End of dynamic heap growth. */
JSGC_HIGH_FREQUENCY_HIGH_LIMIT = 13,
/* Upper bound of heap growth. */
JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MAX = 14,
/* Lower bound of heap growth. */
JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MIN = 15,
/* Heap growth for low frequency GCs. */
JSGC_LOW_FREQUENCY_HEAP_GROWTH = 16,
/*
* If false, the heap growth factor is fixed at 3. If true, it is determined
* based on whether GCs are high- or low- frequency.
*/
JSGC_DYNAMIC_HEAP_GROWTH = 17,
/* If true, high-frequency GCs will use a longer mark slice. */
JSGC_DYNAMIC_MARK_SLICE = 18,
/* Lower limit after which we limit the heap growth. */
JSGC_ALLOCATION_THRESHOLD = 19,
/*
* We decommit memory lazily. If more than this number of megabytes is
* available to be decommitted, then JS_MaybeGC will trigger a shrinking GC
* to decommit it.
*/
JSGC_DECOMMIT_THRESHOLD = 20,
/*
* We try to keep at least this many unused chunks in the free chunk pool at
* all times, even after a shrinking GC.
*/
JSGC_MIN_EMPTY_CHUNK_COUNT = 21,
/* We never keep more than this many unused chunks in the free chunk pool. */
JSGC_MAX_EMPTY_CHUNK_COUNT = 22
} JSGCParamKey;
extern JS_PUBLIC_API(void)
JS_SetGCParameter(JSRuntime *rt, JSGCParamKey key, uint32_t value);
extern JS_PUBLIC_API(uint32_t)
JS_GetGCParameter(JSRuntime *rt, JSGCParamKey key);
extern JS_PUBLIC_API(void)
JS_SetGCParameterForThread(JSContext *cx, JSGCParamKey key, uint32_t value);
extern JS_PUBLIC_API(uint32_t)
JS_GetGCParameterForThread(JSContext *cx, JSGCParamKey key);
extern JS_PUBLIC_API(void)
JS_SetGCParametersBasedOnAvailableMemory(JSRuntime *rt, uint32_t availMem);
/*
* Create a new JSString whose chars member refers to external memory, i.e.,
* memory requiring application-specific finalization.
*/
extern JS_PUBLIC_API(JSString *)
JS_NewExternalString(JSContext *cx, const jschar *chars, size_t length,
const JSStringFinalizer *fin);
/*
* Return whether 'str' was created with JS_NewExternalString or
* JS_NewExternalStringWithClosure.
*/
extern JS_PUBLIC_API(bool)
JS_IsExternalString(JSString *str);
/*
* Return the 'closure' arg passed to JS_NewExternalStringWithClosure or
* nullptr if the external string was created via JS_NewExternalString.
*/
extern JS_PUBLIC_API(const JSStringFinalizer *)
JS_GetExternalStringFinalizer(JSString *str);
/*
* Set the size of the native stack that should not be exceed. To disable
* stack size checking pass 0.
*
* SpiderMonkey allows for a distinction between system code (such as GCs, which
* may incidentally be triggered by script but are not strictly performed on
* behalf of such script), trusted script (as determined by JS_SetTrustedPrincipals),
* and untrusted script. Each kind of code may have a different stack quota,
* allowing embedders to keep higher-priority machinery running in the face of
* scripted stack exhaustion by something else.
*
* The stack quotas for each kind of code should be monotonically descending,
* and may be specified with this function. If 0 is passed for a given kind
* of code, it defaults to the value of the next-highest-priority kind.
*/
extern JS_PUBLIC_API(void)
JS_SetNativeStackQuota(JSRuntime *cx, size_t systemCodeStackSize,
size_t trustedScriptStackSize = 0,
size_t untrustedScriptStackSize = 0);
/************************************************************************/
extern JS_PUBLIC_API(int)
JS_IdArrayLength(JSContext *cx, JSIdArray *ida);
extern JS_PUBLIC_API(jsid)
JS_IdArrayGet(JSContext *cx, JSIdArray *ida, unsigned index);
extern JS_PUBLIC_API(void)
JS_DestroyIdArray(JSContext *cx, JSIdArray *ida);
namespace JS {
class AutoIdArray : private AutoGCRooter
{
public:
AutoIdArray(JSContext *cx, JSIdArray *ida
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: AutoGCRooter(cx, IDARRAY), context(cx), idArray(ida)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
~AutoIdArray() {
if (idArray)
JS_DestroyIdArray(context, idArray);
}
bool operator!() const {
return !idArray;
}
jsid operator[](size_t i) const {
JS_ASSERT(idArray);
return JS_IdArrayGet(context, idArray, unsigned(i));
}
size_t length() const {
return JS_IdArrayLength(context, idArray);
}
friend void AutoGCRooter::trace(JSTracer *trc);
JSIdArray *steal() {
JSIdArray *copy = idArray;
idArray = nullptr;
return copy;
}
protected:
inline void trace(JSTracer *trc);
private:
JSContext *context;
JSIdArray *idArray;
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
/* No copy or assignment semantics. */
AutoIdArray(AutoIdArray &ida) MOZ_DELETE;
void operator=(AutoIdArray &ida) MOZ_DELETE;
};
} /* namespace JS */
extern JS_PUBLIC_API(bool)
JS_ValueToId(JSContext *cx, JS::HandleValue v, JS::MutableHandleId idp);
extern JS_PUBLIC_API(bool)
JS_StringToId(JSContext *cx, JS::HandleString s, JS::MutableHandleId idp);
extern JS_PUBLIC_API(bool)
JS_IdToValue(JSContext *cx, jsid id, JS::MutableHandle<JS::Value> vp);
/*
* Invoke the [[DefaultValue]] hook (see ES5 8.6.2) with the provided hint on
* the specified object, computing a primitive default value for the object.
* The hint must be JSTYPE_STRING, JSTYPE_NUMBER, or JSTYPE_VOID (no hint). On
* success the resulting value is stored in *vp.
*/
extern JS_PUBLIC_API(bool)
JS_DefaultValue(JSContext *cx, JS::Handle<JSObject*> obj, JSType hint,
JS::MutableHandle<JS::Value> vp);
extern JS_PUBLIC_API(bool)
JS_PropertyStub(JSContext *cx, JS::HandleObject obj, JS::HandleId id,
JS::MutableHandleValue vp);
extern JS_PUBLIC_API(bool)
JS_StrictPropertyStub(JSContext *cx, JS::HandleObject obj, JS::HandleId id, bool strict,
JS::MutableHandleValue vp);
extern JS_PUBLIC_API(bool)
JS_DeletePropertyStub(JSContext *cx, JS::HandleObject obj, JS::HandleId id,
bool *succeeded);
extern JS_PUBLIC_API(bool)
JS_EnumerateStub(JSContext *cx, JS::HandleObject obj);
extern JS_PUBLIC_API(bool)
JS_ResolveStub(JSContext *cx, JS::HandleObject obj, JS::HandleId id);
extern JS_PUBLIC_API(bool)
JS_ConvertStub(JSContext *cx, JS::HandleObject obj, JSType type,
JS::MutableHandleValue vp);
struct JSConstDoubleSpec {
double dval;
const char *name;
uint8_t flags;
uint8_t spare[3];
};
struct JSJitInfo;
/*
* Wrappers to replace {Strict,}PropertyOp for JSPropertySpecs. This will allow
* us to pass one JSJitInfo per function with the property spec, without
* additional field overhead.
*/
typedef struct JSStrictPropertyOpWrapper {
JSStrictPropertyOp op;
const JSJitInfo *info;
} JSStrictPropertyOpWrapper;
typedef struct JSPropertyOpWrapper {
JSPropertyOp op;
const JSJitInfo *info;
} JSPropertyOpWrapper;
/*
* Wrapper to do as above, but for JSNatives for JSFunctionSpecs.
*/
typedef struct JSNativeWrapper {
JSNative op;
const JSJitInfo *info;
} JSNativeWrapper;
/*
* Macro static initializers which make it easy to pass no JSJitInfo as part of a
* JSPropertySpec or JSFunctionSpec.
*/
#define JSOP_WRAPPER(op) { {op, nullptr} }
#define JSOP_NULLWRAPPER JSOP_WRAPPER(nullptr)
/*
* To define an array element rather than a named property member, cast the
* element's index to (const char *) and initialize name with it, and set the
* JSPROP_INDEX bit in flags.
*/
struct JSPropertySpec {
struct SelfHostedWrapper {
void *unused;
const char *funname;
};
const char *name;
uint8_t flags;
union {
JSPropertyOpWrapper propertyOp;
SelfHostedWrapper selfHosted;
} getter;
union {
JSStrictPropertyOpWrapper propertyOp;
SelfHostedWrapper selfHosted;
} setter;
private:
void StaticAsserts() {
JS_STATIC_ASSERT(sizeof(SelfHostedWrapper) == sizeof(JSPropertyOpWrapper));
JS_STATIC_ASSERT(sizeof(SelfHostedWrapper) == sizeof(JSStrictPropertyOpWrapper));
JS_STATIC_ASSERT(offsetof(SelfHostedWrapper, funname) ==
offsetof(JSPropertyOpWrapper, info));
}
};
namespace JS {
namespace detail {
/* NEVER DEFINED, DON'T USE. For use by JS_CAST_NATIVE_TO only. */
inline int CheckIsNative(JSNative native);
/* NEVER DEFINED, DON'T USE. For use by JS_CAST_STRING_TO only. */
template<size_t N>
inline int
CheckIsCharacterLiteral(const char (&arr)[N]);
} // namespace detail
} // namespace JS
#define JS_CAST_NATIVE_TO(v, To) \
(static_cast<void>(sizeof(JS::detail::CheckIsNative(v))), \
reinterpret_cast<To>(v))
#define JS_CAST_STRING_TO(s, To) \
(static_cast<void>(sizeof(JS::detail::CheckIsCharacterLiteral(s))), \
reinterpret_cast<To>(s))
#define JS_CHECK_ACCESSOR_FLAGS(flags) \
(static_cast<mozilla::EnableIf<!((flags) & (JSPROP_READONLY | JSPROP_SHARED | JSPROP_NATIVE_ACCESSORS))>::Type>(0), \
(flags))
/*
* JSPropertySpec uses JSAPI JSPropertyOp and JSStrictPropertyOp in function
* signatures. These macros encapsulate the definition of JSNative-backed
* JSPropertySpecs, performing type-safe casts on the getter/setter functions
* and adding the necessary property flags to trigger interpretation as
* JSNatives.
*/
#define JS_PSG(name, getter, flags) \
{name, \
uint8_t(JS_CHECK_ACCESSOR_FLAGS(flags) | JSPROP_SHARED | JSPROP_NATIVE_ACCESSORS), \
JSOP_WRAPPER(JS_CAST_NATIVE_TO(getter, JSPropertyOp)), \
JSOP_NULLWRAPPER}
#define JS_PSGS(name, getter, setter, flags) \
{name, \
uint8_t(JS_CHECK_ACCESSOR_FLAGS(flags) | JSPROP_SHARED | JSPROP_NATIVE_ACCESSORS), \
JSOP_WRAPPER(JS_CAST_NATIVE_TO(getter, JSPropertyOp)), \
JSOP_WRAPPER(JS_CAST_NATIVE_TO(setter, JSStrictPropertyOp))}
#define JS_SELF_HOSTED_GET(name, getterName, flags) \
{name, \
uint8_t(JS_CHECK_ACCESSOR_FLAGS(flags) | JSPROP_SHARED | JSPROP_GETTER), \
{ nullptr, JS_CAST_STRING_TO(getterName, const JSJitInfo *) }, \
JSOP_NULLWRAPPER }
#define JS_SELF_HOSTED_GETSET(name, getterName, setterName, flags) \
{name, \
uint8_t(JS_CHECK_ACCESSOR_FLAGS(flags) | JSPROP_SHARED | JSPROP_GETTER | JSPROP_SETTER), \
{ nullptr, JS_CAST_STRING_TO(getterName, const JSJitInfo *) }, \
{ nullptr, JS_CAST_STRING_TO(setterName, const JSJitInfo *) } }
#define JS_PS_END { nullptr, 0, JSOP_NULLWRAPPER, JSOP_NULLWRAPPER }
/*
* To define a native function, set call to a JSNativeWrapper. To define a
* self-hosted function, set selfHostedName to the name of a function
* compiled during JSRuntime::initSelfHosting.
*/
struct JSFunctionSpec {
const char *name;
JSNativeWrapper call;
uint16_t nargs;
uint16_t flags;
const char *selfHostedName;
};
/*
* Terminating sentinel initializer to put at the end of a JSFunctionSpec array
* that's passed to JS_DefineFunctions or JS_InitClass.
*/
#define JS_FS_END JS_FS(nullptr,nullptr,0,0)
/*
* Initializer macros for a JSFunctionSpec array element. JS_FN (whose name pays
* homage to the old JSNative/JSFastNative split) simply adds the flag
* JSFUN_STUB_GSOPS. JS_FNINFO allows the simple adding of
* JSJitInfos. JS_SELF_HOSTED_FN declares a self-hosted function. Finally
* JS_FNSPEC has slots for all the fields.
*/
#define JS_FS(name,call,nargs,flags) \
JS_FNSPEC(name, call, nullptr, nargs, flags, nullptr)
#define JS_FN(name,call,nargs,flags) \
JS_FNSPEC(name, call, nullptr, nargs, (flags) | JSFUN_STUB_GSOPS, nullptr)
#define JS_FNINFO(name,call,info,nargs,flags) \
JS_FNSPEC(name, call, info, nargs, flags, nullptr)
#define JS_SELF_HOSTED_FN(name,selfHostedName,nargs,flags) \
JS_FNSPEC(name, nullptr, nullptr, nargs, flags, selfHostedName)
#define JS_FNSPEC(name,call,info,nargs,flags,selfHostedName) \
{name, {call, info}, nargs, flags, selfHostedName}
extern JS_PUBLIC_API(JSObject *)
JS_InitClass(JSContext *cx, JS::HandleObject obj, JS::HandleObject parent_proto,
const JSClass *clasp, JSNative constructor, unsigned nargs,
const JSPropertySpec *ps, const JSFunctionSpec *fs,
const JSPropertySpec *static_ps, const JSFunctionSpec *static_fs);
/*
* Set up ctor.prototype = proto and proto.constructor = ctor with the
* right property flags.
*/
extern JS_PUBLIC_API(bool)
JS_LinkConstructorAndPrototype(JSContext *cx, JS::Handle<JSObject*> ctor,
JS::Handle<JSObject*> proto);
extern JS_PUBLIC_API(const JSClass *)
JS_GetClass(JSObject *obj);
extern JS_PUBLIC_API(bool)
JS_InstanceOf(JSContext *cx, JS::Handle<JSObject*> obj, const JSClass *clasp, JS::CallArgs *args);
extern JS_PUBLIC_API(bool)
JS_HasInstance(JSContext *cx, JS::Handle<JSObject*> obj, JS::Handle<JS::Value> v, bool *bp);
extern JS_PUBLIC_API(void *)
JS_GetPrivate(JSObject *obj);
extern JS_PUBLIC_API(void)
JS_SetPrivate(JSObject *obj, void *data);
extern JS_PUBLIC_API(void *)
JS_GetInstancePrivate(JSContext *cx, JS::Handle<JSObject*> obj, const JSClass *clasp,
JS::CallArgs *args);
extern JS_PUBLIC_API(bool)
JS_GetPrototype(JSContext *cx, JS::HandleObject obj, JS::MutableHandleObject protop);
extern JS_PUBLIC_API(bool)
JS_SetPrototype(JSContext *cx, JS::HandleObject obj, JS::HandleObject proto);
extern JS_PUBLIC_API(JSObject *)
JS_GetParent(JSObject *obj);
extern JS_PUBLIC_API(bool)
JS_SetParent(JSContext *cx, JS::HandleObject obj, JS::HandleObject parent);
extern JS_PUBLIC_API(JSObject *)
JS_GetConstructor(JSContext *cx, JS::Handle<JSObject*> proto);
namespace JS {
enum ZoneSpecifier {
FreshZone = 0,
SystemZone = 1
};
class JS_PUBLIC_API(CompartmentOptions)
{
public:
class Override {
public:
Override() : mode_(Default) {}
bool get(bool defaultValue) const {
if (mode_ == Default)
return defaultValue;
return mode_ == ForceTrue;
};
void set(bool overrideValue) {
mode_ = overrideValue ? ForceTrue : ForceFalse;
};
void reset() {
mode_ = Default;
}
private:
enum Mode {
Default,
ForceTrue,
ForceFalse
};
Mode mode_;
};
explicit CompartmentOptions()
: version_(JSVERSION_UNKNOWN)
, invisibleToDebugger_(false)
, mergeable_(false)
, discardSource_(false)
, cloneSingletons_(false)
, traceGlobal_(nullptr)
, singletonsAsTemplates_(true)
, addonId_(nullptr)
{
zone_.spec = JS::FreshZone;
}
JSVersion version() const { return version_; }
CompartmentOptions &setVersion(JSVersion aVersion) {
MOZ_ASSERT(aVersion != JSVERSION_UNKNOWN);
version_ = aVersion;
return *this;
}
// Certain scopes (i.e. XBL compilation scopes) are implementation details
// of the embedding, and references to them should never leak out to script.
// This flag causes the this compartment to skip firing onNewGlobalObject
// and makes addDebuggee a no-op for this global.
bool invisibleToDebugger() const { return invisibleToDebugger_; }
CompartmentOptions &setInvisibleToDebugger(bool flag) {
invisibleToDebugger_ = flag;
return *this;
}
// Compartments used for off-thread compilation have their contents merged
// into a target compartment when the compilation is finished. This is only
// allowed if this flag is set. The invisibleToDebugger flag must also be
// set for such compartments.
bool mergeable() const { return mergeable_; }
CompartmentOptions &setMergeable(bool flag) {
mergeable_ = flag;
return *this;
}
// For certain globals, we know enough about the code that will run in them
// that we can discard script source entirely.
bool discardSource() const { return discardSource_; }
CompartmentOptions &setDiscardSource(bool flag) {
discardSource_ = flag;
return *this;
}
bool cloneSingletons() const { return cloneSingletons_; }
CompartmentOptions &setCloneSingletons(bool flag) {
cloneSingletons_ = flag;
return *this;
}
void *zonePointer() const {
JS_ASSERT(uintptr_t(zone_.pointer) > uintptr_t(JS::SystemZone));
return zone_.pointer;
}
ZoneSpecifier zoneSpecifier() const { return zone_.spec; }
CompartmentOptions &setZone(ZoneSpecifier spec);
CompartmentOptions &setSameZoneAs(JSObject *obj);
void setSingletonsAsValues() {
singletonsAsTemplates_ = false;
}
bool getSingletonsAsTemplates() const {
return singletonsAsTemplates_;
};
// A null add-on ID means that the compartment is not associated with an
// add-on.
JSAddonId *addonIdOrNull() const { return addonId_; }
CompartmentOptions &setAddonId(JSAddonId *id) {
addonId_ = id;
return *this;
}
CompartmentOptions &setTrace(JSTraceOp op) {
traceGlobal_ = op;
return *this;
}
JSTraceOp getTrace() const {
return traceGlobal_;
}
private:
JSVersion version_;
bool invisibleToDebugger_;
bool mergeable_;
bool discardSource_;
bool cloneSingletons_;
union {
ZoneSpecifier spec;
void *pointer; // js::Zone* is not exposed in the API.
} zone_;
JSTraceOp traceGlobal_;
// To XDR singletons, we need to ensure that all singletons are all used as
// templates, by making JSOP_OBJECT return a clone of the JSScript
// singleton, instead of returning the value which is baked in the JSScript.
bool singletonsAsTemplates_;
JSAddonId *addonId_;
};
JS_PUBLIC_API(CompartmentOptions &)
CompartmentOptionsRef(JSCompartment *compartment);
JS_PUBLIC_API(CompartmentOptions &)
CompartmentOptionsRef(JSObject *obj);
JS_PUBLIC_API(CompartmentOptions &)
CompartmentOptionsRef(JSContext *cx);
// During global creation, we fire notifications to callbacks registered
// via the Debugger API. These callbacks are arbitrary script, and can touch
// the global in arbitrary ways. When that happens, the global should not be
// in a half-baked state. But this creates a problem for consumers that need
// to set slots on the global to put it in a consistent state.
//
// This API provides a way for consumers to set slots atomically (immediately
// after the global is created), before any debugger hooks are fired. It's
// unfortunately on the clunky side, but that's the way the cookie crumbles.
//
// If callers have no additional state on the global to set up, they may pass
// |FireOnNewGlobalHook| to JS_NewGlobalObject, which causes that function to
// fire the hook as its final act before returning. Otherwise, callers should
// pass |DontFireOnNewGlobalHook|, which means that they are responsible for
// invoking JS_FireOnNewGlobalObject upon successfully creating the global. If
// an error occurs and the operation aborts, callers should skip firing the
// hook. But otherwise, callers must take care to fire the hook exactly once
// before compiling any script in the global's scope (we have assertions in
// place to enforce this). This lets us be sure that debugger clients never miss
// breakpoints.
enum OnNewGlobalHookOption {
FireOnNewGlobalHook,
DontFireOnNewGlobalHook
};
} /* namespace JS */
extern JS_PUBLIC_API(JSObject *)
JS_NewGlobalObject(JSContext *cx, const JSClass *clasp, JSPrincipals *principals,
JS::OnNewGlobalHookOption hookOption,
const JS::CompartmentOptions &options = JS::CompartmentOptions());
/*
* Spidermonkey does not have a good way of keeping track of what compartments should be marked on
* their own. We can mark the roots unconditionally, but marking GC things only relevant in live
* compartments is hard. To mitigate this, we create a static trace hook, installed on each global
* object, from which we can be sure the compartment is relevant, and mark it.
*
* It is still possible to specify custom trace hooks for global object classes. They can be
* provided via the CompartmentOptions passed to JS_NewGlobalObject.
*/
extern JS_PUBLIC_API(void)
JS_GlobalObjectTraceHook(JSTracer *trc, JSObject *global);
extern JS_PUBLIC_API(void)
JS_FireOnNewGlobalObject(JSContext *cx, JS::HandleObject global);
extern JS_PUBLIC_API(JSObject *)
JS_NewObject(JSContext *cx, const JSClass *clasp, JS::Handle<JSObject*> proto,
JS::Handle<JSObject*> parent);
/* Queries the [[Extensible]] property of the object. */
extern JS_PUBLIC_API(bool)
JS_IsExtensible(JSContext *cx, JS::HandleObject obj, bool *extensible);
extern JS_PUBLIC_API(bool)
JS_IsNative(JSObject *obj);
extern JS_PUBLIC_API(JSRuntime *)
JS_GetObjectRuntime(JSObject *obj);
/*
* Unlike JS_NewObject, JS_NewObjectWithGivenProto does not compute a default
* proto if proto's actual parameter value is null.
*/
extern JS_PUBLIC_API(JSObject *)
JS_NewObjectWithGivenProto(JSContext *cx, const JSClass *clasp, JS::Handle<JSObject*> proto,
JS::Handle<JSObject*> parent);
/*
* Freeze obj, and all objects it refers to, recursively. This will not recurse
* through non-extensible objects, on the assumption that those are already
* deep-frozen.
*/
extern JS_PUBLIC_API(bool)
JS_DeepFreezeObject(JSContext *cx, JS::Handle<JSObject*> obj);
/*
* Freezes an object; see ES5's Object.freeze(obj) method.
*/
extern JS_PUBLIC_API(bool)
JS_FreezeObject(JSContext *cx, JS::Handle<JSObject*> obj);
extern JS_PUBLIC_API(bool)
JS_PreventExtensions(JSContext *cx, JS::HandleObject obj);
extern JS_PUBLIC_API(JSObject *)
JS_New(JSContext *cx, JS::HandleObject ctor, const JS::HandleValueArray& args);
extern JS_PUBLIC_API(JSObject *)
JS_DefineObject(JSContext *cx, JS::HandleObject obj, const char *name,
const JSClass *clasp = nullptr, JS::HandleObject proto = JS::NullPtr(),
unsigned attrs = 0);
extern JS_PUBLIC_API(bool)
JS_DefineConstDoubles(JSContext *cx, JS::HandleObject obj, const JSConstDoubleSpec *cds);
extern JS_PUBLIC_API(bool)
JS_DefineProperties(JSContext *cx, JS::HandleObject obj, const JSPropertySpec *ps);
extern JS_PUBLIC_API(bool)
JS_DefineProperty(JSContext *cx, JS::HandleObject obj, const char *name, JS::HandleValue value,
unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_DefineProperty(JSContext *cx, JS::HandleObject obj, const char *name, JS::HandleObject value,
unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_DefineProperty(JSContext *cx, JS::HandleObject obj, const char *name, JS::HandleString value,
unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_DefineProperty(JSContext *cx, JS::HandleObject obj, const char *name, int32_t value,
unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_DefineProperty(JSContext *cx, JS::HandleObject obj, const char *name, uint32_t value,
unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_DefineProperty(JSContext *cx, JS::HandleObject obj, const char *name, double value,
unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_DefinePropertyById(JSContext *cx, JS::HandleObject obj, JS::HandleId id, JS::HandleValue value,
unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_DefinePropertyById(JSContext *cx, JS::HandleObject obj, JS::HandleId id, JS::HandleObject value,
unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_DefinePropertyById(JSContext *cx, JS::HandleObject obj, JS::HandleId id, JS::HandleString value,
unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_DefinePropertyById(JSContext *cx, JS::HandleObject obj, JS::HandleId id, int32_t value,
unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_DefinePropertyById(JSContext *cx, JS::HandleObject obj, JS::HandleId id, uint32_t value,
unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_DefinePropertyById(JSContext *cx, JS::HandleObject obj, JS::HandleId id, double value,
unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_AlreadyHasOwnProperty(JSContext *cx, JS::HandleObject obj, const char *name,
bool *foundp);
extern JS_PUBLIC_API(bool)
JS_AlreadyHasOwnPropertyById(JSContext *cx, JS::HandleObject obj, JS::HandleId id,
bool *foundp);
extern JS_PUBLIC_API(bool)
JS_HasProperty(JSContext *cx, JS::HandleObject obj, const char *name, bool *foundp);
extern JS_PUBLIC_API(bool)
JS_HasPropertyById(JSContext *cx, JS::HandleObject obj, JS::HandleId id, bool *foundp);
extern JS_PUBLIC_API(bool)
JS_LookupProperty(JSContext *cx, JS::HandleObject obj, const char *name, JS::MutableHandleValue vp);
extern JS_PUBLIC_API(bool)
JS_LookupPropertyById(JSContext *cx, JS::HandleObject obj, JS::HandleId id,
JS::MutableHandleValue vp);
struct JSPropertyDescriptor {
JSObject *obj;
unsigned attrs;
JSPropertyOp getter;
JSStrictPropertyOp setter;
JS::Value value;
JSPropertyDescriptor()
: obj(nullptr), attrs(0), getter(nullptr), setter(nullptr), value(JSVAL_VOID)
{}
void trace(JSTracer *trc);
static js::ThingRootKind rootKind() { return js::THING_ROOT_PROPERTY_DESCRIPTOR; }
};
namespace JS {
template <typename Outer>
class PropertyDescriptorOperations
{
const JSPropertyDescriptor * desc() const { return static_cast<const Outer*>(this)->extract(); }
public:
bool isEnumerable() const { return desc()->attrs & JSPROP_ENUMERATE; }
bool isReadonly() const { return desc()->attrs & JSPROP_READONLY; }
bool isPermanent() const { return desc()->attrs & JSPROP_PERMANENT; }
bool hasNativeAccessors() const { return desc()->attrs & JSPROP_NATIVE_ACCESSORS; }
bool hasGetterObject() const { return desc()->attrs & JSPROP_GETTER; }
bool hasSetterObject() const { return desc()->attrs & JSPROP_SETTER; }
bool hasGetterOrSetterObject() const { return desc()->attrs & (JSPROP_GETTER | JSPROP_SETTER); }
bool hasGetterOrSetter() const { return desc()->getter || desc()->setter; }
bool isShared() const { return desc()->attrs & JSPROP_SHARED; }
bool isIndex() const { return desc()->attrs & JSPROP_INDEX; }
bool hasAttributes(unsigned attrs) const { return desc()->attrs & attrs; }
JS::HandleObject object() const {
return JS::HandleObject::fromMarkedLocation(&desc()->obj);
}
unsigned attributes() const { return desc()->attrs; }
JSPropertyOp getter() const { return desc()->getter; }
JSStrictPropertyOp setter() const { return desc()->setter; }
JS::HandleObject getterObject() const {
MOZ_ASSERT(hasGetterObject());
return JS::HandleObject::fromMarkedLocation(
reinterpret_cast<JSObject *const *>(&desc()->getter));
}
JS::HandleObject setterObject() const {
MOZ_ASSERT(hasSetterObject());
return JS::HandleObject::fromMarkedLocation(
reinterpret_cast<JSObject *const *>(&desc()->setter));
}
JS::HandleValue value() const {
return JS::HandleValue::fromMarkedLocation(&desc()->value);
}
};
template <typename Outer>
class MutablePropertyDescriptorOperations : public PropertyDescriptorOperations<Outer>
{
JSPropertyDescriptor * desc() { return static_cast<Outer*>(this)->extractMutable(); }
public:
void clear() {
object().set(nullptr);
setAttributes(0);
setGetter(nullptr);
setSetter(nullptr);
value().setUndefined();
}
void assign(JSPropertyDescriptor &other) {
object().set(other.obj);
setAttributes(other.attrs);
setGetter(other.getter);
setSetter(other.setter);
value().set(other.value);
}
JS::MutableHandleObject object() {
return JS::MutableHandleObject::fromMarkedLocation(&desc()->obj);
}
unsigned &attributesRef() { return desc()->attrs; }
JSPropertyOp &getter() { return desc()->getter; }
JSStrictPropertyOp &setter() { return desc()->setter; }
JS::MutableHandleValue value() {
return JS::MutableHandleValue::fromMarkedLocation(&desc()->value);
}
void setEnumerable() { desc()->attrs |= JSPROP_ENUMERATE; }
void setAttributes(unsigned attrs) { desc()->attrs = attrs; }
void setGetter(JSPropertyOp op) { desc()->getter = op; }
void setSetter(JSStrictPropertyOp op) { desc()->setter = op; }
void setGetterObject(JSObject *obj) { desc()->getter = reinterpret_cast<JSPropertyOp>(obj); }
void setSetterObject(JSObject *obj) { desc()->setter = reinterpret_cast<JSStrictPropertyOp>(obj); }
JS::MutableHandleObject getterObject() {
MOZ_ASSERT(this->hasGetterObject());
return JS::MutableHandleObject::fromMarkedLocation(
reinterpret_cast<JSObject **>(&desc()->getter));
}
JS::MutableHandleObject setterObject() {
MOZ_ASSERT(this->hasSetterObject());
return JS::MutableHandleObject::fromMarkedLocation(
reinterpret_cast<JSObject **>(&desc()->setter));
}
};
} /* namespace JS */
namespace js {
template <>
struct GCMethods<JSPropertyDescriptor> {
static JSPropertyDescriptor initial() { return JSPropertyDescriptor(); }
static bool poisoned(const JSPropertyDescriptor &desc) {
return (desc.obj && JS::IsPoisonedPtr(desc.obj)) ||
(desc.attrs & JSPROP_GETTER && desc.getter && JS::IsPoisonedPtr(desc.getter)) ||
(desc.attrs & JSPROP_SETTER && desc.setter && JS::IsPoisonedPtr(desc.setter)) ||
(desc.value.isGCThing() && JS::IsPoisonedPtr(desc.value.toGCThing()));
}
};
template <>
class RootedBase<JSPropertyDescriptor>
: public JS::MutablePropertyDescriptorOperations<JS::Rooted<JSPropertyDescriptor> >
{
friend class JS::PropertyDescriptorOperations<JS::Rooted<JSPropertyDescriptor> >;
friend class JS::MutablePropertyDescriptorOperations<JS::Rooted<JSPropertyDescriptor> >;
const JSPropertyDescriptor *extract() const {
return static_cast<const JS::Rooted<JSPropertyDescriptor>*>(this)->address();
}
JSPropertyDescriptor *extractMutable() {
return static_cast<JS::Rooted<JSPropertyDescriptor>*>(this)->address();
}
};
template <>
class HandleBase<JSPropertyDescriptor>
: public JS::PropertyDescriptorOperations<JS::Handle<JSPropertyDescriptor> >
{
friend class JS::PropertyDescriptorOperations<JS::Handle<JSPropertyDescriptor> >;
const JSPropertyDescriptor *extract() const {
return static_cast<const JS::Handle<JSPropertyDescriptor>*>(this)->address();
}
};
template <>
class MutableHandleBase<JSPropertyDescriptor>
: public JS::MutablePropertyDescriptorOperations<JS::MutableHandle<JSPropertyDescriptor> >
{
friend class JS::PropertyDescriptorOperations<JS::MutableHandle<JSPropertyDescriptor> >;
friend class JS::MutablePropertyDescriptorOperations<JS::MutableHandle<JSPropertyDescriptor> >;
const JSPropertyDescriptor *extract() const {
return static_cast<const JS::MutableHandle<JSPropertyDescriptor>*>(this)->address();
}
JSPropertyDescriptor *extractMutable() {
return static_cast<JS::MutableHandle<JSPropertyDescriptor>*>(this)->address();
}
};
} /* namespace js */
namespace JS {
extern JS_PUBLIC_API(bool)
ParsePropertyDescriptorObject(JSContext *cx,
JS::HandleObject obj,
JS::HandleValue descriptor,
JS::MutableHandle<JSPropertyDescriptor> desc);
} // namespace JS
extern JS_PUBLIC_API(bool)
JS_GetOwnPropertyDescriptorById(JSContext *cx, JS::HandleObject obj, JS::HandleId id,
JS::MutableHandle<JSPropertyDescriptor> desc);
extern JS_PUBLIC_API(bool)
JS_GetOwnPropertyDescriptor(JSContext *cx, JS::HandleObject obj, const char *name,
JS::MutableHandle<JSPropertyDescriptor> desc);
/*
* Like JS_GetOwnPropertyDescriptorById but will return a property on
* an object on the prototype chain (returned in desc->obj). If desc->obj is null,
* then this property was not found on the prototype chain.
*/
extern JS_PUBLIC_API(bool)
JS_GetPropertyDescriptorById(JSContext *cx, JS::HandleObject obj, JS::HandleId id,
JS::MutableHandle<JSPropertyDescriptor> desc);
extern JS_PUBLIC_API(bool)
JS_GetPropertyDescriptor(JSContext *cx, JS::HandleObject obj, const char *name,
JS::MutableHandle<JSPropertyDescriptor> desc);
extern JS_PUBLIC_API(bool)
JS_GetProperty(JSContext *cx, JS::HandleObject obj, const char *name, JS::MutableHandleValue vp);
extern JS_PUBLIC_API(bool)
JS_GetPropertyById(JSContext *cx, JS::HandleObject obj, JS::HandleId id, JS::MutableHandleValue vp);
extern JS_PUBLIC_API(bool)
JS_ForwardGetPropertyTo(JSContext *cx, JS::HandleObject obj, JS::HandleId id, JS::HandleObject onBehalfOf,
JS::MutableHandleValue vp);
extern JS_PUBLIC_API(bool)
JS_SetProperty(JSContext *cx, JS::HandleObject obj, const char *name, JS::HandleValue v);
extern JS_PUBLIC_API(bool)
JS_SetPropertyById(JSContext *cx, JS::HandleObject obj, JS::HandleId id, JS::HandleValue v);
extern JS_PUBLIC_API(bool)
JS_DeleteProperty(JSContext *cx, JS::HandleObject obj, const char *name);
extern JS_PUBLIC_API(bool)
JS_DeleteProperty2(JSContext *cx, JS::HandleObject obj, const char *name, bool *succeeded);
extern JS_PUBLIC_API(bool)
JS_DeletePropertyById(JSContext *cx, JS::HandleObject obj, jsid id);
extern JS_PUBLIC_API(bool)
JS_DeletePropertyById2(JSContext *cx, JS::HandleObject obj, JS::HandleId id, bool *succeeded);
extern JS_PUBLIC_API(bool)
JS_DefineUCProperty(JSContext *cx, JS::HandleObject obj, const jschar *name, size_t namelen,
JS::HandleValue value, unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_DefineUCProperty(JSContext *cx, JS::HandleObject obj, const jschar *name, size_t namelen,
JS::HandleObject value, unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_DefineUCProperty(JSContext *cx, JS::HandleObject obj, const jschar *name, size_t namelen,
JS::HandleString value, unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_DefineUCProperty(JSContext *cx, JS::HandleObject obj, const jschar *name, size_t namelen,
int32_t value, unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_DefineUCProperty(JSContext *cx, JS::HandleObject obj, const jschar *name, size_t namelen,
uint32_t value, unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_DefineUCProperty(JSContext *cx, JS::HandleObject obj, const jschar *name, size_t namelen,
double value, unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_AlreadyHasOwnUCProperty(JSContext *cx, JS::HandleObject obj, const jschar *name,
size_t namelen, bool *foundp);
extern JS_PUBLIC_API(bool)
JS_HasUCProperty(JSContext *cx, JS::HandleObject obj,
const jschar *name, size_t namelen,
bool *vp);
extern JS_PUBLIC_API(bool)
JS_LookupUCProperty(JSContext *cx, JS::HandleObject obj,
const jschar *name, size_t namelen,
JS::MutableHandleValue vp);
extern JS_PUBLIC_API(bool)
JS_GetUCProperty(JSContext *cx, JS::HandleObject obj,
const jschar *name, size_t namelen,
JS::MutableHandleValue vp);
extern JS_PUBLIC_API(bool)
JS_SetUCProperty(JSContext *cx, JS::HandleObject obj,
const jschar *name, size_t namelen,
JS::HandleValue v);
extern JS_PUBLIC_API(bool)
JS_DeleteUCProperty2(JSContext *cx, JS::HandleObject obj, const jschar *name, size_t namelen,
bool *succeeded);
extern JS_PUBLIC_API(JSObject *)
JS_NewArrayObject(JSContext *cx, const JS::HandleValueArray& contents);
extern JS_PUBLIC_API(JSObject *)
JS_NewArrayObject(JSContext *cx, size_t length);
extern JS_PUBLIC_API(bool)
JS_IsArrayObject(JSContext *cx, JS::HandleValue value);
extern JS_PUBLIC_API(bool)
JS_IsArrayObject(JSContext *cx, JS::HandleObject obj);
extern JS_PUBLIC_API(bool)
JS_GetArrayLength(JSContext *cx, JS::Handle<JSObject*> obj, uint32_t *lengthp);
extern JS_PUBLIC_API(bool)
JS_SetArrayLength(JSContext *cx, JS::Handle<JSObject*> obj, uint32_t length);
extern JS_PUBLIC_API(bool)
JS_DefineElement(JSContext *cx, JS::HandleObject obj, uint32_t index, JS::HandleValue value,
unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_DefineElement(JSContext *cx, JS::HandleObject obj, uint32_t index, JS::HandleObject value,
unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_DefineElement(JSContext *cx, JS::HandleObject obj, uint32_t index, JS::HandleString value,
unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_DefineElement(JSContext *cx, JS::HandleObject obj, uint32_t index, int32_t value,
unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_DefineElement(JSContext *cx, JS::HandleObject obj, uint32_t index, uint32_t value,
unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_DefineElement(JSContext *cx, JS::HandleObject obj, uint32_t index, double value,
unsigned attrs,
JSPropertyOp getter = nullptr, JSStrictPropertyOp setter = nullptr);
extern JS_PUBLIC_API(bool)
JS_AlreadyHasOwnElement(JSContext *cx, JS::HandleObject obj, uint32_t index, bool *foundp);
extern JS_PUBLIC_API(bool)
JS_HasElement(JSContext *cx, JS::HandleObject obj, uint32_t index, bool *foundp);
extern JS_PUBLIC_API(bool)
JS_LookupElement(JSContext *cx, JS::HandleObject obj, uint32_t index, JS::MutableHandleValue vp);
extern JS_PUBLIC_API(bool)
JS_GetElement(JSContext *cx, JS::HandleObject obj, uint32_t index, JS::MutableHandleValue vp);
extern JS_PUBLIC_API(bool)
JS_ForwardGetElementTo(JSContext *cx, JS::HandleObject obj, uint32_t index,
JS::HandleObject onBehalfOf, JS::MutableHandleValue vp);
extern JS_PUBLIC_API(bool)
JS_SetElement(JSContext *cx, JS::HandleObject obj, uint32_t index, JS::HandleValue v);
extern JS_PUBLIC_API(bool)
JS_SetElement(JSContext *cx, JS::HandleObject obj, uint32_t index, JS::HandleObject v);
extern JS_PUBLIC_API(bool)
JS_SetElement(JSContext *cx, JS::HandleObject obj, uint32_t index, JS::HandleString v);
extern JS_PUBLIC_API(bool)
JS_SetElement(JSContext *cx, JS::HandleObject obj, uint32_t index, int32_t v);
extern JS_PUBLIC_API(bool)
JS_SetElement(JSContext *cx, JS::HandleObject obj, uint32_t index, uint32_t v);
extern JS_PUBLIC_API(bool)
JS_SetElement(JSContext *cx, JS::HandleObject obj, uint32_t index, double v);
extern JS_PUBLIC_API(bool)
JS_DeleteElement(JSContext *cx, JS::HandleObject obj, uint32_t index);
extern JS_PUBLIC_API(bool)
JS_DeleteElement2(JSContext *cx, JS::HandleObject obj, uint32_t index, bool *succeeded);
/*
* Remove all configurable properties from the given (non-global) object and
* assign undefined to all writable data properties.
*/
JS_PUBLIC_API(void)
JS_ClearNonGlobalObject(JSContext *cx, JS::HandleObject obj);
/*
* Assign 'undefined' to all of the object's non-reserved slots. Note: this is
* done for all slots, regardless of the associated property descriptor.
*/
JS_PUBLIC_API(void)
JS_SetAllNonReservedSlotsToUndefined(JSContext *cx, JSObject *objArg);
/*
* Create a new array buffer with the given contents. On success, the ownership
* is transferred to the new array buffer.
*/
extern JS_PUBLIC_API(JSObject *)
JS_NewArrayBufferWithContents(JSContext *cx, size_t nbytes, void *contents);
/*
* Steal the contents of the given array buffer. The array buffer has its
* length set to 0 and its contents array cleared. The caller takes ownership
* of the return value and must free it or transfer ownership via
* JS_NewArrayBufferWithContents when done using it.
*/
extern JS_PUBLIC_API(void *)
JS_StealArrayBufferContents(JSContext *cx, JS::HandleObject obj);
/*
* Allocate memory that may be eventually passed to
* JS_NewArrayBufferWithContents. |maybecx| is optional; if a non-nullptr cx is
* given, it will be used for memory accounting and OOM reporting. |nbytes| is
* the number of payload bytes required.
*/
extern JS_PUBLIC_API(void *)
JS_AllocateArrayBufferContents(JSContext *maybecx, uint32_t nbytes);
/*
* Reallocate memory allocated by JS_AllocateArrayBufferContents, growing or
* shrinking it as appropriate. If oldContents is null then this behaves like
* JS_AllocateArrayBufferContents.
*/
extern JS_PUBLIC_API(void *)
JS_ReallocateArrayBufferContents(JSContext *cx, uint32_t nbytes, void *oldContents, uint32_t oldNbytes);
/*
* Create a new mapped array buffer with the given memory mapped contents. On success,
* the ownership is transferred to the new mapped array buffer.
*/
extern JS_PUBLIC_API(JSObject *)
JS_NewMappedArrayBufferWithContents(JSContext *cx, size_t nbytes, void *contents);
/*
* Create memory mapped array buffer contents.
* Caller must take care of closing fd after calling this function.
*/
extern JS_PUBLIC_API(void *)
JS_CreateMappedArrayBufferContents(int fd, size_t offset, size_t length);
/*
* Release the allocated resource of mapped array buffer contents before the
* object is created.
* If a new object has been created by JS_NewMappedArrayBufferWithContents()
* with this content, then JS_NeuterArrayBuffer() should be used instead to
* release the resource used by the object.
*/
extern JS_PUBLIC_API(void)
JS_ReleaseMappedArrayBufferContents(void *contents, size_t length);
extern JS_PUBLIC_API(JSIdArray *)
JS_Enumerate(JSContext *cx, JS::HandleObject obj);
/*
* Create an object to iterate over enumerable properties of obj, in arbitrary
* property definition order. NB: This differs from longstanding for..in loop
* order, which uses order of property definition in obj.
*/
extern JS_PUBLIC_API(JSObject *)
JS_NewPropertyIterator(JSContext *cx, JS::Handle<JSObject*> obj);
/*
* Return true on success with *idp containing the id of the next enumerable
* property to visit using iterobj, or JSID_IS_VOID if there is no such property
* left to visit. Return false on error.
*/
extern JS_PUBLIC_API(bool)
JS_NextProperty(JSContext *cx, JS::Handle<JSObject*> iterobj, jsid *idp);
extern JS_PUBLIC_API(jsval)
JS_GetReservedSlot(JSObject *obj, uint32_t index);
extern JS_PUBLIC_API(void)
JS_SetReservedSlot(JSObject *obj, uint32_t index, jsval v);
/************************************************************************/
/*
* Functions and scripts.
*/
extern JS_PUBLIC_API(JSFunction *)
JS_NewFunction(JSContext *cx, JSNative call, unsigned nargs, unsigned flags,
JS::Handle<JSObject*> parent, const char *name);
/*
* Create the function with the name given by the id. JSID_IS_STRING(id) must
* be true.
*/
extern JS_PUBLIC_API(JSFunction *)
JS_NewFunctionById(JSContext *cx, JSNative call, unsigned nargs, unsigned flags,
JS::Handle<JSObject*> parent, JS::Handle<jsid> id);
namespace JS {
extern JS_PUBLIC_API(JSFunction *)
GetSelfHostedFunction(JSContext *cx, const char *selfHostedName, JS::Handle<jsid> id,
unsigned nargs);
} /* namespace JS */
extern JS_PUBLIC_API(JSObject *)
JS_GetFunctionObject(JSFunction *fun);
/*
* Return the function's identifier as a JSString, or null if fun is unnamed.
* The returned string lives as long as fun, so you don't need to root a saved
* reference to it if fun is well-connected or rooted, and provided you bound
* the use of the saved reference by fun's lifetime.
*/
extern JS_PUBLIC_API(JSString *)
JS_GetFunctionId(JSFunction *fun);
/*
* Return a function's display name. This is the defined name if one was given
* where the function was defined, or it could be an inferred name by the JS
* engine in the case that the function was defined to be anonymous. This can
* still return nullptr if a useful display name could not be inferred. The
* same restrictions on rooting as those in JS_GetFunctionId apply.
*/
extern JS_PUBLIC_API(JSString *)
JS_GetFunctionDisplayId(JSFunction *fun);
/*
* Return the arity (length) of fun.
*/
extern JS_PUBLIC_API(uint16_t)
JS_GetFunctionArity(JSFunction *fun);
/*
* Infallible predicate to test whether obj is a function object (faster than
* comparing obj's class name to "Function", but equivalent unless someone has
* overwritten the "Function" identifier with a different constructor and then
* created instances using that constructor that might be passed in as obj).
*/
extern JS_PUBLIC_API(bool)
JS_ObjectIsFunction(JSContext *cx, JSObject *obj);
extern JS_PUBLIC_API(bool)
JS_ObjectIsCallable(JSContext *cx, JSObject *obj);
extern JS_PUBLIC_API(bool)
JS_IsNativeFunction(JSObject *funobj, JSNative call);
/* Return whether the given function is a valid constructor. */
extern JS_PUBLIC_API(bool)
JS_IsConstructor(JSFunction *fun);
/*
* Bind the given callable to use the given object as "this".
*
* If |callable| is not callable, will throw and return nullptr.
*/
extern JS_PUBLIC_API(JSObject*)
JS_BindCallable(JSContext *cx, JS::Handle<JSObject*> callable, JS::Handle<JSObject*> newThis);
extern JS_PUBLIC_API(bool)
JS_DefineFunctions(JSContext *cx, JS::Handle<JSObject*> obj, const JSFunctionSpec *fs);
extern JS_PUBLIC_API(JSFunction *)
JS_DefineFunction(JSContext *cx, JS::Handle<JSObject*> obj, const char *name, JSNative call,
unsigned nargs, unsigned attrs);
extern JS_PUBLIC_API(JSFunction *)
JS_DefineUCFunction(JSContext *cx, JS::Handle<JSObject*> obj,
const jschar *name, size_t namelen, JSNative call,
unsigned nargs, unsigned attrs);
extern JS_PUBLIC_API(JSFunction *)
JS_DefineFunctionById(JSContext *cx, JS::Handle<JSObject*> obj, JS::Handle<jsid> id, JSNative call,
unsigned nargs, unsigned attrs);
/*
* Clone a top-level function into a new scope. This function will dynamically
* fail if funobj was lexically nested inside some other function.
*/
extern JS_PUBLIC_API(JSObject *)
JS_CloneFunctionObject(JSContext *cx, JS::Handle<JSObject*> funobj, JS::Handle<JSObject*> parent);
/*
* Given a buffer, return false if the buffer might become a valid
* javascript statement with the addition of more lines. Otherwise return
* true. The intent is to support interactive compilation - accumulate
* lines in a buffer until JS_BufferIsCompilableUnit is true, then pass it to
* the compiler.
*/
extern JS_PUBLIC_API(bool)
JS_BufferIsCompilableUnit(JSContext *cx, JS::Handle<JSObject*> obj, const char *utf8,
size_t length);
/*
* |script| will always be set. On failure, it will be set to nullptr.
*/
extern JS_PUBLIC_API(bool)
JS_CompileScript(JSContext *cx, JS::HandleObject obj,
const char *ascii, size_t length,
const JS::CompileOptions &options,
JS::MutableHandleScript script);
/*
* |script| will always be set. On failure, it will be set to nullptr.
*/
extern JS_PUBLIC_API(bool)
JS_CompileUCScript(JSContext *cx, JS::HandleObject obj,
const jschar *chars, size_t length,
const JS::CompileOptions &options,
JS::MutableHandleScript script);
extern JS_PUBLIC_API(JSObject *)
JS_GetGlobalFromScript(JSScript *script);
/*
* |fun| will always be set. On failure, it will be set to nullptr.
*/
extern JS_PUBLIC_API(bool)
JS_CompileFunction(JSContext *cx, JS::HandleObject obj, const char *name,
unsigned nargs, const char *const *argnames,
const char *bytes, size_t length,
const JS::CompileOptions &options,
JS::MutableHandleFunction fun);
/*
* |fun| will always be set. On failure, it will be set to nullptr.
*/
extern JS_PUBLIC_API(bool)
JS_CompileUCFunction(JSContext *cx, JS::HandleObject obj, const char *name,
unsigned nargs, const char *const *argnames,
const jschar *chars, size_t length,
const JS::CompileOptions &options,
JS::MutableHandleFunction fun);
namespace JS {
/* Options for JavaScript compilation. */
/*
* In the most common use case, a CompileOptions instance is allocated on the
* stack, and holds non-owning references to non-POD option values: strings;
* principals; objects; and so on. The code declaring the instance guarantees
* that such option values will outlive the CompileOptions itself: objects are
* otherwise rooted; principals have had their reference counts bumped; strings
* will not be freed until the CompileOptions goes out of scope. In this
* situation, CompileOptions only refers to things others own, so it can be
* lightweight.
*
* In some cases, however, we need to hold compilation options with a
* non-stack-like lifetime. For example, JS::CompileOffThread needs to save
* compilation options where a worker thread can find them, and then return
* immediately. The worker thread will come along at some later point, and use
* the options.
*
* The compiler itself just needs to be able to access a collection of options;
* it doesn't care who owns them, or what's keeping them alive. It does its own
* addrefs/copies/tracing/etc.
*
* So, we have a class hierarchy that reflects these three use cases:
*
* - ReadOnlyCompileOptions is the common base class. It can be used by code
* that simply needs to access options set elsewhere, like the compiler.
*
* - The usual CompileOptions class must be stack-allocated, and holds
* non-owning references to the filename, element, and so on. It's derived
* from ReadOnlyCompileOptions, so the compiler can use it.
*
* - OwningCompileOptions roots / copies / reference counts of all its values,
* and unroots / frees / releases them when it is destructed. It too is
* derived from ReadOnlyCompileOptions, so the compiler accepts it.
*/
/*
* The common base class for the CompileOptions hierarchy.
*
* Use this in code that only needs to access compilation options created
* elsewhere, like the compiler. Don't instantiate this class (the constructor
* is protected anyway); instead, create instances only of the derived classes:
* CompileOptions and OwningCompileOptions.
*/
class JS_FRIEND_API(ReadOnlyCompileOptions)
{
friend class CompileOptions;
protected:
JSPrincipals *originPrincipals_;
const char *filename_;
const char *introducerFilename_;
const jschar *sourceMapURL_;
// This constructor leaves 'version' set to JSVERSION_UNKNOWN. The structure
// is unusable until that's set to something more specific; the derived
// classes' constructors take care of that, in ways appropriate to their
// purpose.
ReadOnlyCompileOptions()
: originPrincipals_(nullptr),
filename_(nullptr),
introducerFilename_(nullptr),
sourceMapURL_(nullptr),
version(JSVERSION_UNKNOWN),
versionSet(false),
utf8(false),
lineno(1),
column(0),
compileAndGo(false),
forEval(false),
defineOnScope(true),
noScriptRval(false),
selfHostingMode(false),
canLazilyParse(true),
strictOption(false),
extraWarningsOption(false),
werrorOption(false),
asmJSOption(false),
forceAsync(false),
installedFile(false),
sourceIsLazy(false),
introductionType(nullptr),
introductionLineno(0),
introductionOffset(0),
hasIntroductionInfo(false)
{ }
// Set all POD options (those not requiring reference counts, copies,
// rooting, or other hand-holding) to their values in |rhs|.
void copyPODOptions(const ReadOnlyCompileOptions &rhs);
public:
// Read-only accessors for non-POD options. The proper way to set these
// depends on the derived type.
JSPrincipals *originPrincipals(js::ExclusiveContext *cx) const;
const char *filename() const { return filename_; }
const char *introducerFilename() const { return introducerFilename_; }
const jschar *sourceMapURL() const { return sourceMapURL_; }
virtual JSObject *element() const = 0;
virtual JSString *elementAttributeName() const = 0;
virtual JSScript *introductionScript() const = 0;
// POD options.
JSVersion version;
bool versionSet;
bool utf8;
unsigned lineno;
unsigned column;
bool compileAndGo;
bool forEval;
bool defineOnScope;
bool noScriptRval;
bool selfHostingMode;
bool canLazilyParse;
bool strictOption;
bool extraWarningsOption;
bool werrorOption;
bool asmJSOption;
bool forceAsync;
bool installedFile; // 'true' iff pre-compiling js file in packaged app
bool sourceIsLazy;
// |introductionType| is a statically allocated C string:
// one of "eval", "Function", or "GeneratorFunction".
const char *introductionType;
unsigned introductionLineno;
uint32_t introductionOffset;
bool hasIntroductionInfo;
private:
static JSObject * const nullObjectPtr;
void operator=(const ReadOnlyCompileOptions &) MOZ_DELETE;
};
/*
* Compilation options, with dynamic lifetime. An instance of this type
* makes a copy of / holds / roots all dynamically allocated resources
* (principals; elements; strings) that it refers to. Its destructor frees
* / drops / unroots them. This is heavier than CompileOptions, below, but
* unlike CompileOptions, it can outlive any given stack frame.
*
* Note that this *roots* any JS values it refers to - they're live
* unconditionally. Thus, instances of this type can't be owned, directly
* or indirectly, by a JavaScript object: if any value that this roots ever
* comes to refer to the object that owns this, then the whole cycle, and
* anything else it entrains, will never be freed.
*/
class JS_FRIEND_API(OwningCompileOptions) : public ReadOnlyCompileOptions
{
JSRuntime *runtime;
PersistentRootedObject elementRoot;
PersistentRootedString elementAttributeNameRoot;
PersistentRootedScript introductionScriptRoot;
public:
// A minimal constructor, for use with OwningCompileOptions::copy. This
// leaves |this.version| set to JSVERSION_UNKNOWN; the instance
// shouldn't be used until we've set that to something real (as |copy|
// will).
explicit OwningCompileOptions(JSContext *cx);
~OwningCompileOptions();
JSObject *element() const MOZ_OVERRIDE { return elementRoot; }
JSString *elementAttributeName() const MOZ_OVERRIDE { return elementAttributeNameRoot; }
JSScript *introductionScript() const MOZ_OVERRIDE { return introductionScriptRoot; }
// Set this to a copy of |rhs|. Return false on OOM.
bool copy(JSContext *cx, const ReadOnlyCompileOptions &rhs);
/* These setters make copies of their string arguments, and are fallible. */
bool setFile(JSContext *cx, const char *f);
bool setFileAndLine(JSContext *cx, const char *f, unsigned l);
bool setSourceMapURL(JSContext *cx, const jschar *s);
bool setIntroducerFilename(JSContext *cx, const char *s);
/* These setters are infallible, and can be chained. */
OwningCompileOptions &setLine(unsigned l) { lineno = l; return *this; }
OwningCompileOptions &setElement(JSObject *e) {
elementRoot = e;
return *this;
}
OwningCompileOptions &setElementAttributeName(JSString *p) {
elementAttributeNameRoot = p;
return *this;
}
OwningCompileOptions &setIntroductionScript(JSScript *s) {
introductionScriptRoot = s;
return *this;
}
OwningCompileOptions &setOriginPrincipals(JSPrincipals *p) {
if (p) JS_HoldPrincipals(p);
if (originPrincipals_) JS_DropPrincipals(runtime, originPrincipals_);
originPrincipals_ = p;
return *this;
}
OwningCompileOptions &setVersion(JSVersion v) {
version = v;
versionSet = true;
return *this;
}
OwningCompileOptions &setUTF8(bool u) { utf8 = u; return *this; }
OwningCompileOptions &setColumn(unsigned c) { column = c; return *this; }
OwningCompileOptions &setCompileAndGo(bool cng) { compileAndGo = cng; return *this; }
OwningCompileOptions &setForEval(bool eval) { forEval = eval; return *this; }
OwningCompileOptions &setDefineOnScope(bool define) { defineOnScope = define; return *this; }
OwningCompileOptions &setNoScriptRval(bool nsr) { noScriptRval = nsr; return *this; }
OwningCompileOptions &setSelfHostingMode(bool shm) { selfHostingMode = shm; return *this; }
OwningCompileOptions &setCanLazilyParse(bool clp) { canLazilyParse = clp; return *this; }
OwningCompileOptions &setSourceIsLazy(bool l) { sourceIsLazy = l; return *this; }
OwningCompileOptions &setIntroductionType(const char *t) { introductionType = t; return *this; }
bool setIntroductionInfo(JSContext *cx, const char *introducerFn, const char *intro,
unsigned line, JSScript *script, uint32_t offset)
{
if (!setIntroducerFilename(cx, introducerFn))
return false;
introductionType = intro;
introductionLineno = line;
introductionScriptRoot = script;
introductionOffset = offset;
hasIntroductionInfo = true;
return true;
}
private:
void operator=(const CompileOptions &rhs) MOZ_DELETE;
};
/*
* Compilation options stored on the stack. An instance of this type
* simply holds references to dynamically allocated resources (element;
* filename; source map URL) that are owned by something else. If you
* create an instance of this type, it's up to you to guarantee that
* everything you store in it will outlive it.
*/
class MOZ_STACK_CLASS JS_FRIEND_API(CompileOptions) : public ReadOnlyCompileOptions
{
RootedObject elementRoot;
RootedString elementAttributeNameRoot;
RootedScript introductionScriptRoot;
public:
explicit CompileOptions(JSContext *cx, JSVersion version = JSVERSION_UNKNOWN);
CompileOptions(js::ContextFriendFields *cx, const ReadOnlyCompileOptions &rhs)
: ReadOnlyCompileOptions(), elementRoot(cx), elementAttributeNameRoot(cx),
introductionScriptRoot(cx)
{
copyPODOptions(rhs);
originPrincipals_ = rhs.originPrincipals_;
filename_ = rhs.filename();
sourceMapURL_ = rhs.sourceMapURL();
elementRoot = rhs.element();
elementAttributeNameRoot = rhs.elementAttributeName();
introductionScriptRoot = rhs.introductionScript();
}
JSObject *element() const MOZ_OVERRIDE { return elementRoot; }
JSString *elementAttributeName() const MOZ_OVERRIDE { return elementAttributeNameRoot; }
JSScript *introductionScript() const MOZ_OVERRIDE { return introductionScriptRoot; }
CompileOptions &setFile(const char *f) { filename_ = f; return *this; }
CompileOptions &setLine(unsigned l) { lineno = l; return *this; }
CompileOptions &setFileAndLine(const char *f, unsigned l) {
filename_ = f; lineno = l; return *this;
}
CompileOptions &setSourceMapURL(const jschar *s) { sourceMapURL_ = s; return *this; }
CompileOptions &setElement(JSObject *e) { elementRoot = e; return *this; }
CompileOptions &setElementAttributeName(JSString *p) {
elementAttributeNameRoot = p;
return *this;
}
CompileOptions &setIntroductionScript(JSScript *s) {
introductionScriptRoot = s;
return *this;
}
CompileOptions &setOriginPrincipals(JSPrincipals *p) {
originPrincipals_ = p;
return *this;
}
CompileOptions &setVersion(JSVersion v) {
version = v;
versionSet = true;
return *this;
}
CompileOptions &setUTF8(bool u) { utf8 = u; return *this; }
CompileOptions &setColumn(unsigned c) { column = c; return *this; }
CompileOptions &setCompileAndGo(bool cng) { compileAndGo = cng; return *this; }
CompileOptions &setForEval(bool eval) { forEval = eval; return *this; }
CompileOptions &setDefineOnScope(bool define) { defineOnScope = define; return *this; }
CompileOptions &setNoScriptRval(bool nsr) { noScriptRval = nsr; return *this; }
CompileOptions &setSelfHostingMode(bool shm) { selfHostingMode = shm; return *this; }
CompileOptions &setCanLazilyParse(bool clp) { canLazilyParse = clp; return *this; }
CompileOptions &setSourceIsLazy(bool l) { sourceIsLazy = l; return *this; }
CompileOptions &setIntroductionType(const char *t) { introductionType = t; return *this; }
CompileOptions &setIntroductionInfo(const char *introducerFn, const char *intro,
unsigned line, JSScript *script, uint32_t offset)
{
introducerFilename_ = introducerFn;
introductionType = intro;
introductionLineno = line;
introductionScriptRoot = script;
introductionOffset = offset;
hasIntroductionInfo = true;
return *this;
}
private:
void operator=(const CompileOptions &rhs) MOZ_DELETE;
};
/*
* |script| will always be set. On failure, it will be set to nullptr.
*/
extern JS_PUBLIC_API(bool)
Compile(JSContext *cx, JS::HandleObject obj, const ReadOnlyCompileOptions &options,
SourceBufferHolder &srcBuf, JS::MutableHandleScript script);
extern JS_PUBLIC_API(bool)
Compile(JSContext *cx, JS::HandleObject obj, const ReadOnlyCompileOptions &options,
const char *bytes, size_t length, JS::MutableHandleScript script);
extern JS_PUBLIC_API(bool)
Compile(JSContext *cx, JS::HandleObject obj, const ReadOnlyCompileOptions &options,
const jschar *chars, size_t length, JS::MutableHandleScript script);
extern JS_PUBLIC_API(bool)
Compile(JSContext *cx, JS::HandleObject obj, const ReadOnlyCompileOptions &options, FILE *file,
JS::MutableHandleScript script);
extern JS_PUBLIC_API(bool)
Compile(JSContext *cx, JS::HandleObject obj, const ReadOnlyCompileOptions &options, const char *filename,
JS::MutableHandleScript script);
extern JS_PUBLIC_API(bool)
CanCompileOffThread(JSContext *cx, const ReadOnlyCompileOptions &options, size_t length);
/*
* Off thread compilation control flow.
*
* After successfully triggering an off thread compile of a script, the
* callback will eventually be invoked with the specified data and a token
* for the compilation. The callback will be invoked while off the main thread,
* so must ensure that its operations are thread safe. Afterwards,
* FinishOffThreadScript must be invoked on the main thread to get the result
* script or nullptr. If maybecx is not specified, the resources will be freed,
* but no script will be returned.
*
* The characters passed in to CompileOffThread must remain live until the
* callback is invoked, and the resulting script will be rooted until the call
* to FinishOffThreadScript.
*/
extern JS_PUBLIC_API(bool)
CompileOffThread(JSContext *cx, const ReadOnlyCompileOptions &options,
const jschar *chars, size_t length,
OffThreadCompileCallback callback, void *callbackData);
extern JS_PUBLIC_API(JSScript *)
FinishOffThreadScript(JSContext *maybecx, JSRuntime *rt, void *token);
extern JS_PUBLIC_API(bool)
CompileFunction(JSContext *cx, JS::HandleObject obj, const ReadOnlyCompileOptions &options,
const char *name, unsigned nargs, const char *const *argnames,
SourceBufferHolder &srcBuf, JS::MutableHandleFunction fun);
extern JS_PUBLIC_API(bool)
CompileFunction(JSContext *cx, JS::HandleObject obj, const ReadOnlyCompileOptions &options,
const char *name, unsigned nargs, const char *const *argnames,
const char *bytes, size_t length, JS::MutableHandleFunction fun);
extern JS_PUBLIC_API(bool)
CompileFunction(JSContext *cx, JS::HandleObject obj, const ReadOnlyCompileOptions &options,
const char *name, unsigned nargs, const char *const *argnames,
const jschar *chars, size_t length, JS::MutableHandleFunction fun);
} /* namespace JS */
extern JS_PUBLIC_API(JSString *)
JS_DecompileScript(JSContext *cx, JS::Handle<JSScript*> script, const char *name, unsigned indent);
/*
* API extension: OR this into indent to avoid pretty-printing the decompiled
* source resulting from JS_DecompileFunction{,Body}.
*/
#define JS_DONT_PRETTY_PRINT ((unsigned)0x8000)
extern JS_PUBLIC_API(JSString *)
JS_DecompileFunction(JSContext *cx, JS::Handle<JSFunction*> fun, unsigned indent);
extern JS_PUBLIC_API(JSString *)
JS_DecompileFunctionBody(JSContext *cx, JS::Handle<JSFunction*> fun, unsigned indent);
/*
* NB: JS_ExecuteScript and the JS_Evaluate*Script* quadruplets use the obj
* parameter as the initial scope chain header, the 'this' keyword value, and
* the variables object (ECMA parlance for where 'var' and 'function' bind
* names) of the execution context for script.
*
* Using obj as the variables object is problematic if obj's parent (which is
* the scope chain link; see JS_SetParent and JS_NewObject) is not null: in
* this case, variables created by 'var x = 0', e.g., go in obj, but variables
* created by assignment to an unbound id, 'x = 0', go in the last object on
* the scope chain linked by parent.
*
* ECMA calls that last scoping object the "global object", but note that many
* embeddings have several such objects. ECMA requires that "global code" be
* executed with the variables object equal to this global object. But these
* JS API entry points provide freedom to execute code against a "sub-global",
* i.e., a parented or scoped object, in which case the variables object will
* differ from the last object on the scope chain, resulting in confusing and
* non-ECMA explicit vs. implicit variable creation.
*
* Caveat embedders: unless you already depend on this buggy variables object
* binding behavior, you should call ContextOptionsRef(cx).setVarObjFix(true)
* for each context in the application, if you pass parented objects as the obj
* parameter, or may ever pass such objects in the future.
*
* Why a runtime option? The alternative is to add six or so new API entry
* points with signatures matching the following six, and that doesn't seem
* worth the code bloat cost. Such new entry points would probably have less
* obvious names, too, so would not tend to be used. The JS_SetOption call,
* OTOH, can be more easily hacked into existing code that does not depend on
* the bug; such code can continue to use the familiar JS_EvaluateScript,
* etc., entry points.
*/
extern JS_PUBLIC_API(bool)
JS_ExecuteScript(JSContext *cx, JS::HandleObject obj, JS::HandleScript script, JS::MutableHandleValue rval);
extern JS_PUBLIC_API(bool)
JS_ExecuteScript(JSContext *cx, JS::HandleObject obj, JS::HandleScript script);
namespace JS {
/*
* Like the above, but handles a cross-compartment script. If the script is
* cross-compartment, it is cloned into the current compartment before executing.
*/
extern JS_PUBLIC_API(bool)
CloneAndExecuteScript(JSContext *cx, JS::Handle<JSObject*> obj, JS::Handle<JSScript*> script);
} /* namespace JS */
extern JS_PUBLIC_API(bool)
JS_ExecuteScriptVersion(JSContext *cx, JS::HandleObject obj, JS::HandleScript script,
JS::MutableHandleValue rval, JSVersion version);
extern JS_PUBLIC_API(bool)
JS_ExecuteScriptVersion(JSContext *cx, JS::HandleObject obj, JS::HandleScript script,
JSVersion version);
extern JS_PUBLIC_API(bool)
JS_EvaluateScript(JSContext *cx, JS::HandleObject obj,
const char *bytes, unsigned length,
const char *filename, unsigned lineno,
JS::MutableHandleValue rval);
extern JS_PUBLIC_API(bool)
JS_EvaluateScript(JSContext *cx, JS::HandleObject obj,
const char *bytes, unsigned length,
const char *filename, unsigned lineno);
extern JS_PUBLIC_API(bool)
JS_EvaluateUCScript(JSContext *cx, JS::Handle<JSObject*> obj,
const jschar *chars, unsigned length,
const char *filename, unsigned lineno,
JS::MutableHandle<JS::Value> rval);
namespace JS {
extern JS_PUBLIC_API(bool)
Evaluate(JSContext *cx, JS::HandleObject obj, const ReadOnlyCompileOptions &options,
SourceBufferHolder &srcBuf, JS::MutableHandleValue rval);
extern JS_PUBLIC_API(bool)
Evaluate(JSContext *cx, JS::HandleObject obj, const ReadOnlyCompileOptions &options,
const jschar *chars, size_t length, JS::MutableHandleValue rval);
extern JS_PUBLIC_API(bool)
Evaluate(JSContext *cx, JS::HandleObject obj, const ReadOnlyCompileOptions &options,
const char *bytes, size_t length, JS::MutableHandleValue rval);
extern JS_PUBLIC_API(bool)
Evaluate(JSContext *cx, JS::HandleObject obj, const ReadOnlyCompileOptions &options,
const char *filename, JS::MutableHandleValue rval);
extern JS_PUBLIC_API(bool)
Evaluate(JSContext *cx, JS::HandleObject obj, const ReadOnlyCompileOptions &options,
SourceBufferHolder &srcBuf);
extern JS_PUBLIC_API(bool)
Evaluate(JSContext *cx, JS::HandleObject obj, const ReadOnlyCompileOptions &options,
const jschar *chars, size_t length);
extern JS_PUBLIC_API(bool)
Evaluate(JSContext *cx, JS::HandleObject obj, const ReadOnlyCompileOptions &options,
const char *bytes, size_t length);
extern JS_PUBLIC_API(bool)
Evaluate(JSContext *cx, JS::HandleObject obj, const ReadOnlyCompileOptions &options,
const char *filename);
} /* namespace JS */
extern JS_PUBLIC_API(bool)
JS_CallFunction(JSContext *cx, JS::HandleObject obj, JS::HandleFunction fun,
const JS::HandleValueArray& args, JS::MutableHandleValue rval);
extern JS_PUBLIC_API(bool)
JS_CallFunctionName(JSContext *cx, JS::HandleObject obj, const char *name,
const JS::HandleValueArray& args, JS::MutableHandleValue rval);
extern JS_PUBLIC_API(bool)
JS_CallFunctionValue(JSContext *cx, JS::HandleObject obj, JS::HandleValue fval,
const JS::HandleValueArray& args, JS::MutableHandleValue rval);
namespace JS {
static inline bool
Call(JSContext *cx, JS::HandleObject thisObj, JS::HandleFunction fun,
const JS::HandleValueArray &args, MutableHandleValue rval)
{
return !!JS_CallFunction(cx, thisObj, fun, args, rval);
}
static inline bool
Call(JSContext *cx, JS::HandleObject thisObj, const char *name, const JS::HandleValueArray& args,
MutableHandleValue rval)
{
return !!JS_CallFunctionName(cx, thisObj, name, args, rval);
}
static inline bool
Call(JSContext *cx, JS::HandleObject thisObj, JS::HandleValue fun, const JS::HandleValueArray& args,
MutableHandleValue rval)
{
return !!JS_CallFunctionValue(cx, thisObj, fun, args, rval);
}
extern JS_PUBLIC_API(bool)
Call(JSContext *cx, JS::HandleValue thisv, JS::HandleValue fun, const JS::HandleValueArray& args,
MutableHandleValue rval);
static inline bool
Call(JSContext *cx, JS::HandleValue thisv, JS::HandleObject funObj, const JS::HandleValueArray& args,
MutableHandleValue rval)
{
JS_ASSERT(funObj);
JS::RootedValue fun(cx, JS::ObjectValue(*funObj));
return Call(cx, thisv, fun, args, rval);
}
extern JS_PUBLIC_API(bool)
Construct(JSContext *cx, JS::HandleValue fun,
const JS::HandleValueArray& args,
MutableHandleValue rval);
} /* namespace JS */
/*
* These functions allow setting an interrupt callback that will be called
* from the JS thread some time after any thread triggered the callback using
* JS_RequestInterruptCallback(rt).
*
* To schedule the GC and for other activities the engine internally triggers
* interrupt callbacks. The embedding should thus not rely on callbacks being
* triggered through the external API only.
*
* Important note: Additional callbacks can occur inside the callback handler
* if it re-enters the JS engine. The embedding must ensure that the callback
* is disconnected before attempting such re-entry.
*/
extern JS_PUBLIC_API(JSInterruptCallback)
JS_SetInterruptCallback(JSRuntime *rt, JSInterruptCallback callback);
extern JS_PUBLIC_API(JSInterruptCallback)
JS_GetInterruptCallback(JSRuntime *rt);
extern JS_PUBLIC_API(void)
JS_RequestInterruptCallback(JSRuntime *rt);
extern JS_PUBLIC_API(bool)
JS_IsRunning(JSContext *cx);
/*
* Saving and restoring frame chains.
*
* These two functions are used to set aside cx's call stack while that stack
* is inactive. After a call to JS_SaveFrameChain, it looks as if there is no
* code running on cx. Before calling JS_RestoreFrameChain, cx's call stack
* must be balanced and all nested calls to JS_SaveFrameChain must have had
* matching JS_RestoreFrameChain calls.
*
* JS_SaveFrameChain deals with cx not having any code running on it.
*/
extern JS_PUBLIC_API(bool)
JS_SaveFrameChain(JSContext *cx);
extern JS_PUBLIC_API(void)
JS_RestoreFrameChain(JSContext *cx);
#ifdef MOZ_TRACE_JSCALLS
/*
* The callback is expected to be quick and noninvasive. It should not
* request interrupts, turn on debugging, or produce uncaught JS
* exceptions. The state of the stack and registers in the context
* cannot be relied upon, since this callback may be invoked directly
* from either JIT. The 'entering' field means we are entering a
* function if it is positive, leaving a function if it is zero or
* negative.
*/
extern JS_PUBLIC_API(void)
JS_SetFunctionCallback(JSContext *cx, JSFunctionCallback fcb);
extern JS_PUBLIC_API(JSFunctionCallback)
JS_GetFunctionCallback(JSContext *cx);
#endif /* MOZ_TRACE_JSCALLS */
/************************************************************************/
/*
* Strings.
*
* NB: JS_NewUCString takes ownership of bytes on success, avoiding a copy;
* but on error (signified by null return), it leaves chars owned by the
* caller. So the caller must free bytes in the error case, if it has no use
* for them. In contrast, all the JS_New*StringCopy* functions do not take
* ownership of the character memory passed to them -- they copy it.
*/
extern JS_PUBLIC_API(JSString *)
JS_NewStringCopyN(JSContext *cx, const char *s, size_t n);
extern JS_PUBLIC_API(JSString *)
JS_NewStringCopyZ(JSContext *cx, const char *s);
extern JS_PUBLIC_API(JSString *)
JS_InternJSString(JSContext *cx, JS::HandleString str);
extern JS_PUBLIC_API(JSString *)
JS_InternStringN(JSContext *cx, const char *s, size_t length);
extern JS_PUBLIC_API(JSString *)
JS_InternString(JSContext *cx, const char *s);
extern JS_PUBLIC_API(JSString *)
JS_NewUCString(JSContext *cx, jschar *chars, size_t length);
extern JS_PUBLIC_API(JSString *)
JS_NewUCStringCopyN(JSContext *cx, const jschar *s, size_t n);
extern JS_PUBLIC_API(JSString *)
JS_NewUCStringCopyZ(JSContext *cx, const jschar *s);
extern JS_PUBLIC_API(JSString *)
JS_InternUCStringN(JSContext *cx, const jschar *s, size_t length);
extern JS_PUBLIC_API(JSString *)
JS_InternUCString(JSContext *cx, const jschar *s);
extern JS_PUBLIC_API(bool)
JS_CompareStrings(JSContext *cx, JSString *str1, JSString *str2, int32_t *result);
extern JS_PUBLIC_API(bool)
JS_StringEqualsAscii(JSContext *cx, JSString *str, const char *asciiBytes, bool *match);
extern JS_PUBLIC_API(size_t)
JS_PutEscapedString(JSContext *cx, char *buffer, size_t size, JSString *str, char quote);
extern JS_PUBLIC_API(bool)
JS_FileEscapedString(FILE *fp, JSString *str, char quote);
/*
* Extracting string characters and length.
*
* While getting the length of a string is infallible, getting the chars can
* fail. As indicated by the lack of a JSContext parameter, there are two
* special cases where getting the chars is infallible:
*
* The first case is interned strings, i.e., strings from JS_InternString or
* JSID_TO_STRING(id), using JS_GetLatin1InternedStringChars or
* JS_GetTwoByteInternedStringChars.
*
* The second case is "flat" strings that have been explicitly prepared in a
* fallible context by JS_FlattenString. To catch errors, a separate opaque
* JSFlatString type is returned by JS_FlattenString and expected by
* JS_GetFlatStringChars. Note, though, that this is purely a syntactic
* distinction: the input and output of JS_FlattenString are the same actual
* GC-thing. If a JSString is known to be flat, JS_ASSERT_STRING_IS_FLAT can be
* used to make a debug-checked cast. Example:
*
* // in a fallible context
* JSFlatString *fstr = JS_FlattenString(cx, str);
* if (!fstr)
* return false;
* JS_ASSERT(fstr == JS_ASSERT_STRING_IS_FLAT(str));
*
* // in an infallible context, for the same 'str'
* AutoCheckCannotGC nogc;
* const jschar *chars = JS_GetTwoByteFlatStringChars(nogc, fstr)
* JS_ASSERT(chars);
*
* Flat strings and interned strings are always null-terminated, so
* JS_FlattenString can be used to get a null-terminated string.
*
* Additionally, string characters are stored as either Latin1Char (8-bit)
* or jschar (16-bit). Clients can use JS_StringHasLatin1Chars and can then
* call either the Latin1* or TwoByte* functions. Some functions like
* JS_CopyStringChars and JS_GetStringCharAt accept both Latin1 and TwoByte
* strings.
*/
extern JS_PUBLIC_API(size_t)
JS_GetStringLength(JSString *str);
extern JS_PUBLIC_API(bool)
JS_StringIsFlat(JSString *str);
/* Returns true iff the string's characters are stored as Latin1. */
extern JS_PUBLIC_API(bool)
JS_StringHasLatin1Chars(JSString *str);
extern JS_PUBLIC_API(const JS::Latin1Char *)
JS_GetLatin1StringCharsAndLength(JSContext *cx, const JS::AutoCheckCannotGC &nogc, JSString *str,
size_t *length);
extern JS_PUBLIC_API(const jschar *)
JS_GetTwoByteStringCharsAndLength(JSContext *cx, const JS::AutoCheckCannotGC &nogc, JSString *str,
size_t *length);
extern JS_PUBLIC_API(bool)
JS_GetStringCharAt(JSContext *cx, JSString *str, size_t index, jschar *res);
extern JS_PUBLIC_API(jschar)
JS_GetFlatStringCharAt(JSFlatString *str, size_t index);
extern JS_PUBLIC_API(const jschar *)
JS_GetTwoByteExternalStringChars(JSString *str);
extern JS_PUBLIC_API(bool)
JS_CopyStringChars(JSContext *cx, mozilla::Range<jschar> dest, JSString *str);
extern JS_PUBLIC_API(const JS::Latin1Char *)
JS_GetLatin1InternedStringChars(const JS::AutoCheckCannotGC &nogc, JSString *str);
extern JS_PUBLIC_API(const jschar *)
JS_GetTwoByteInternedStringChars(const JS::AutoCheckCannotGC &nogc, JSString *str);
extern JS_PUBLIC_API(JSFlatString *)
JS_FlattenString(JSContext *cx, JSString *str);
extern JS_PUBLIC_API(const JS::Latin1Char *)
JS_GetLatin1FlatStringChars(const JS::AutoCheckCannotGC &nogc, JSFlatString *str);
extern JS_PUBLIC_API(const jschar *)
JS_GetTwoByteFlatStringChars(const JS::AutoCheckCannotGC &nogc, JSFlatString *str);
static MOZ_ALWAYS_INLINE JSFlatString *
JSID_TO_FLAT_STRING(jsid id)
{
JS_ASSERT(JSID_IS_STRING(id));
return (JSFlatString *)(JSID_BITS(id));
}
static MOZ_ALWAYS_INLINE JSFlatString *
JS_ASSERT_STRING_IS_FLAT(JSString *str)
{
JS_ASSERT(JS_StringIsFlat(str));
return (JSFlatString *)str;
}
static MOZ_ALWAYS_INLINE JSString *
JS_FORGET_STRING_FLATNESS(JSFlatString *fstr)
{
return (JSString *)fstr;
}
/*
* Additional APIs that avoid fallibility when given a flat string.
*/
extern JS_PUBLIC_API(bool)
JS_FlatStringEqualsAscii(JSFlatString *str, const char *asciiBytes);
extern JS_PUBLIC_API(size_t)
JS_PutEscapedFlatString(char *buffer, size_t size, JSFlatString *str, char quote);
/*
* Create a dependent string, i.e., a string that owns no character storage,
* but that refers to a slice of another string's chars. Dependent strings
* are mutable by definition, so the thread safety comments above apply.
*/
extern JS_PUBLIC_API(JSString *)
JS_NewDependentString(JSContext *cx, JS::HandleString str, size_t start,
size_t length);
/*
* Concatenate two strings, possibly resulting in a rope.
* See above for thread safety comments.
*/
extern JS_PUBLIC_API(JSString *)
JS_ConcatStrings(JSContext *cx, JS::HandleString left, JS::HandleString right);
/*
* For JS_DecodeBytes, set *dstlenp to the size of the destination buffer before
* the call; on return, *dstlenp contains the number of jschars actually stored.
* To determine the necessary destination buffer size, make a sizing call that
* passes nullptr for dst.
*
* On errors, the functions report the error. In that case, *dstlenp contains
* the number of characters or bytes transferred so far. If cx is nullptr, no
* error is reported on failure, and the functions simply return false.
*
* NB: This function does not store an additional zero byte or jschar after the
* transcoded string.
*/
JS_PUBLIC_API(bool)
JS_DecodeBytes(JSContext *cx, const char *src, size_t srclen, jschar *dst,
size_t *dstlenp);
/*
* A variation on JS_EncodeCharacters where a null terminated string is
* returned that you are expected to call JS_free on when done.
*/
JS_PUBLIC_API(char *)
JS_EncodeString(JSContext *cx, JSString *str);
/*
* Same behavior as JS_EncodeString(), but encode into UTF-8 string
*/
JS_PUBLIC_API(char *)
JS_EncodeStringToUTF8(JSContext *cx, JS::HandleString str);
/*
* Get number of bytes in the string encoding (without accounting for a
* terminating zero bytes. The function returns (size_t) -1 if the string
* can not be encoded into bytes and reports an error using cx accordingly.
*/
JS_PUBLIC_API(size_t)
JS_GetStringEncodingLength(JSContext *cx, JSString *str);
/*
* Encode string into a buffer. The function does not stores an additional
* zero byte. The function returns (size_t) -1 if the string can not be
* encoded into bytes with no error reported. Otherwise it returns the number
* of bytes that are necessary to encode the string. If that exceeds the
* length parameter, the string will be cut and only length bytes will be
* written into the buffer.
*/
JS_PUBLIC_API(size_t)
JS_EncodeStringToBuffer(JSContext *cx, JSString *str, char *buffer, size_t length);
class JSAutoByteString
{
public:
JSAutoByteString(JSContext *cx, JSString *str
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: mBytes(JS_EncodeString(cx, str))
{
JS_ASSERT(cx);
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
explicit JSAutoByteString(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM)
: mBytes(nullptr)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
~JSAutoByteString() {
js_free(mBytes);
}
/* Take ownership of the given byte array. */
void initBytes(char *bytes) {
JS_ASSERT(!mBytes);
mBytes = bytes;
}
char *encodeLatin1(JSContext *cx, JSString *str) {
JS_ASSERT(!mBytes);
JS_ASSERT(cx);
mBytes = JS_EncodeString(cx, str);
return mBytes;
}
char *encodeLatin1(js::ExclusiveContext *cx, JSString *str);
char *encodeUtf8(JSContext *cx, JS::HandleString str) {
JS_ASSERT(!mBytes);
JS_ASSERT(cx);
mBytes = JS_EncodeStringToUTF8(cx, str);
return mBytes;
}
void clear() {
js_free(mBytes);
mBytes = nullptr;
}
char *ptr() const {
return mBytes;
}
bool operator!() const {
return !mBytes;
}
size_t length() const {
if (!mBytes)
return 0;
return strlen(mBytes);
}
private:
char *mBytes;
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
/* Copy and assignment are not supported. */
JSAutoByteString(const JSAutoByteString &another);
JSAutoByteString &operator=(const JSAutoByteString &another);
};
namespace JS {
extern JS_PUBLIC_API(JSAddonId *)
NewAddonId(JSContext *cx, JS::HandleString str);
extern JS_PUBLIC_API(JSString *)
StringOfAddonId(JSAddonId *id);
extern JS_PUBLIC_API(JSAddonId *)
AddonIdOfObject(JSObject *obj);
} // namespace JS
/************************************************************************/
/*
* Symbols
*/
namespace JS {
/*
* Create a new Symbol with the given description. This function never returns
* a Symbol that is in the Runtime-wide symbol registry.
*
* If description is null, the new Symbol's [[Description]] attribute is
* undefined.
*/
JS_PUBLIC_API(Symbol *)
NewSymbol(JSContext *cx, HandleString description);
/*
* Symbol.for as specified in ES6.
*
* Get a Symbol with the description 'key' from the Runtime-wide symbol registry.
* If there is not already a Symbol with that description in the registry, a new
* Symbol is created and registered. 'key' must not be null.
*/
JS_PUBLIC_API(Symbol *)
GetSymbolFor(JSContext *cx, HandleString key);
/*
* Get the [[Description]] attribute of the given symbol.
*
* This function is infallible. If it returns null, that means the symbol's
* [[Description]] is undefined.
*/
JS_PUBLIC_API(JSString *)
GetSymbolDescription(HandleSymbol symbol);
/* Well-known symbols. */
MOZ_BEGIN_ENUM_CLASS(SymbolCode, uint32_t)
iterator, // well-known Symbol.iterator
InSymbolRegistry = 0xfffffffe, // created by Symbol.for() or JS::GetSymbolFor()
UniqueSymbol = 0xffffffff // created by Symbol() or JS::NewSymbol()
MOZ_END_ENUM_CLASS(SymbolCode)
/* For use in loops that iterate over the well-known symbols. */
const size_t WellKnownSymbolLimit = 1;
/*
* Return the SymbolCode telling what sort of symbol `symbol` is.
*
* A symbol's SymbolCode never changes once it is created.
*/
JS_PUBLIC_API(SymbolCode)
GetSymbolCode(Handle<Symbol*> symbol);
/*
* Get one of the well-known symbols defined by ES6. A single set of well-known
* symbols is shared by all compartments in a JSRuntime.
*
* `which` must be in the range [0, WellKnownSymbolLimit).
*/
JS_PUBLIC_API(Symbol *)
GetWellKnownSymbol(JSContext *cx, SymbolCode which);
} /* namespace JS */
/************************************************************************/
/*
* JSON functions
*/
typedef bool (* JSONWriteCallback)(const jschar *buf, uint32_t len, void *data);
/*
* JSON.stringify as specified by ES5.
*/
JS_PUBLIC_API(bool)
JS_Stringify(JSContext *cx, JS::MutableHandleValue value, JS::HandleObject replacer,
JS::HandleValue space, JSONWriteCallback callback, void *data);
/*
* JSON.parse as specified by ES5.
*/
JS_PUBLIC_API(bool)
JS_ParseJSON(JSContext *cx, const jschar *chars, uint32_t len, JS::MutableHandleValue vp);
JS_PUBLIC_API(bool)
JS_ParseJSON(JSContext *cx, JS::HandleString str, JS::MutableHandleValue vp);
JS_PUBLIC_API(bool)
JS_ParseJSONWithReviver(JSContext *cx, const jschar *chars, uint32_t len, JS::HandleValue reviver,
JS::MutableHandleValue vp);
JS_PUBLIC_API(bool)
JS_ParseJSONWithReviver(JSContext *cx, JS::HandleString str, JS::HandleValue reviver,
JS::MutableHandleValue vp);
/************************************************************************/
/*
* The default locale for the ECMAScript Internationalization API
* (Intl.Collator, Intl.NumberFormat, Intl.DateTimeFormat).
* Note that the Internationalization API encourages clients to
* specify their own locales.
* The locale string remains owned by the caller.
*/
extern JS_PUBLIC_API(bool)
JS_SetDefaultLocale(JSRuntime *rt, const char *locale);
/*
* Reset the default locale to OS defaults.
*/
extern JS_PUBLIC_API(void)
JS_ResetDefaultLocale(JSRuntime *rt);
/*
* Locale specific string conversion and error message callbacks.
*/
struct JSLocaleCallbacks {
JSLocaleToUpperCase localeToUpperCase;
JSLocaleToLowerCase localeToLowerCase;
JSLocaleCompare localeCompare; // not used #if EXPOSE_INTL_API
JSLocaleToUnicode localeToUnicode;
};
/*
* Establish locale callbacks. The pointer must persist as long as the
* JSRuntime. Passing nullptr restores the default behaviour.
*/
extern JS_PUBLIC_API(void)
JS_SetLocaleCallbacks(JSRuntime *rt, JSLocaleCallbacks *callbacks);
/*
* Return the address of the current locale callbacks struct, which may
* be nullptr.
*/
extern JS_PUBLIC_API(JSLocaleCallbacks *)
JS_GetLocaleCallbacks(JSRuntime *rt);
/************************************************************************/
/*
* Error reporting.
*/
/*
* Report an exception represented by the sprintf-like conversion of format
* and its arguments. This exception message string is passed to a pre-set
* JSErrorReporter function (set by JS_SetErrorReporter).
*/
extern JS_PUBLIC_API(void)
JS_ReportError(JSContext *cx, const char *format, ...);
/*
* Use an errorNumber to retrieve the format string, args are char *
*/
extern JS_PUBLIC_API(void)
JS_ReportErrorNumber(JSContext *cx, JSErrorCallback errorCallback,
void *userRef, const unsigned errorNumber, ...);
#ifdef va_start
extern JS_PUBLIC_API(void)
JS_ReportErrorNumberVA(JSContext *cx, JSErrorCallback errorCallback,
void *userRef, const unsigned errorNumber, va_list ap);
#endif
/*
* Use an errorNumber to retrieve the format string, args are jschar *
*/
extern JS_PUBLIC_API(void)
JS_ReportErrorNumberUC(JSContext *cx, JSErrorCallback errorCallback,
void *userRef, const unsigned errorNumber, ...);
extern JS_PUBLIC_API(void)
JS_ReportErrorNumberUCArray(JSContext *cx, JSErrorCallback errorCallback,
void *userRef, const unsigned errorNumber,
const jschar **args);
/*
* As above, but report a warning instead (JSREPORT_IS_WARNING(report.flags)).
* Return true if there was no error trying to issue the warning, and if the
* warning was not converted into an error due to the JSOPTION_WERROR option
* being set, false otherwise.
*/
extern JS_PUBLIC_API(bool)
JS_ReportWarning(JSContext *cx, const char *format, ...);
extern JS_PUBLIC_API(bool)
JS_ReportErrorFlagsAndNumber(JSContext *cx, unsigned flags,
JSErrorCallback errorCallback, void *userRef,
const unsigned errorNumber, ...);
extern JS_PUBLIC_API(bool)
JS_ReportErrorFlagsAndNumberUC(JSContext *cx, unsigned flags,
JSErrorCallback errorCallback, void *userRef,
const unsigned errorNumber, ...);
/*
* Complain when out of memory.
*/
extern JS_PUBLIC_API(void)
JS_ReportOutOfMemory(JSContext *cx);
/*
* Complain when an allocation size overflows the maximum supported limit.
*/
extern JS_PUBLIC_API(void)
JS_ReportAllocationOverflow(JSContext *cx);
struct JSErrorReport {
const char *filename; /* source file name, URL, etc., or null */
JSPrincipals *originPrincipals; /* see 'originPrincipals' comment above */
unsigned lineno; /* source line number */
const char *linebuf; /* offending source line without final \n */
const char *tokenptr; /* pointer to error token in linebuf */
const jschar *uclinebuf; /* unicode (original) line buffer */
const jschar *uctokenptr; /* unicode (original) token pointer */
unsigned flags; /* error/warning, etc. */
unsigned errorNumber; /* the error number, e.g. see js.msg */
const jschar *ucmessage; /* the (default) error message */
const jschar **messageArgs; /* arguments for the error message */
int16_t exnType; /* One of the JSExnType constants */
unsigned column; /* zero-based column index in line */
};
/*
* JSErrorReport flag values. These may be freely composed.
*/
#define JSREPORT_ERROR 0x0 /* pseudo-flag for default case */
#define JSREPORT_WARNING 0x1 /* reported via JS_ReportWarning */
#define JSREPORT_EXCEPTION 0x2 /* exception was thrown */
#define JSREPORT_STRICT 0x4 /* error or warning due to strict option */
/*
* This condition is an error in strict mode code, a warning if
* JS_HAS_STRICT_OPTION(cx), and otherwise should not be reported at
* all. We check the strictness of the context's top frame's script;
* where that isn't appropriate, the caller should do the right checks
* itself instead of using this flag.
*/
#define JSREPORT_STRICT_MODE_ERROR 0x8
/*
* If JSREPORT_EXCEPTION is set, then a JavaScript-catchable exception
* has been thrown for this runtime error, and the host should ignore it.
* Exception-aware hosts should also check for JS_IsExceptionPending if
* JS_ExecuteScript returns failure, and signal or propagate the exception, as
* appropriate.
*/
#define JSREPORT_IS_WARNING(flags) (((flags) & JSREPORT_WARNING) != 0)
#define JSREPORT_IS_EXCEPTION(flags) (((flags) & JSREPORT_EXCEPTION) != 0)
#define JSREPORT_IS_STRICT(flags) (((flags) & JSREPORT_STRICT) != 0)
#define JSREPORT_IS_STRICT_MODE_ERROR(flags) (((flags) & \
JSREPORT_STRICT_MODE_ERROR) != 0)
extern JS_PUBLIC_API(JSErrorReporter)
JS_GetErrorReporter(JSContext *cx);
extern JS_PUBLIC_API(JSErrorReporter)
JS_SetErrorReporter(JSContext *cx, JSErrorReporter er);
namespace JS {
extern JS_PUBLIC_API(bool)
CreateError(JSContext *cx, JSExnType type, HandleString stack,
HandleString fileName, uint32_t lineNumber, uint32_t columnNumber,
JSErrorReport *report, HandleString message, MutableHandleValue rval);
/************************************************************************/
/*
* Weak Maps.
*/
extern JS_PUBLIC_API(JSObject *)
NewWeakMapObject(JSContext *cx);
extern JS_PUBLIC_API(bool)
IsWeakMapObject(JSObject *obj);
extern JS_PUBLIC_API(bool)
GetWeakMapEntry(JSContext *cx, JS::HandleObject mapObj, JS::HandleObject key,
JS::MutableHandleValue val);
extern JS_PUBLIC_API(bool)
SetWeakMapEntry(JSContext *cx, JS::HandleObject mapObj, JS::HandleObject key,
JS::HandleValue val);
} /* namespace JS */
/*
* Dates.
*/
extern JS_PUBLIC_API(JSObject *)
JS_NewDateObject(JSContext *cx, int year, int mon, int mday, int hour, int min, int sec);
extern JS_PUBLIC_API(JSObject *)
JS_NewDateObjectMsec(JSContext *cx, double msec);
/*
* Infallible predicate to test whether obj is a date object.
*/
extern JS_PUBLIC_API(bool)
JS_ObjectIsDate(JSContext *cx, JS::HandleObject obj);
/*
* Clears the cache of calculated local time from each Date object.
* Call to propagate a system timezone change.
*/
extern JS_PUBLIC_API(void)
JS_ClearDateCaches(JSContext *cx);
/************************************************************************/
/*
* Regular Expressions.
*/
#define JSREG_FOLD 0x01u /* fold uppercase to lowercase */
#define JSREG_GLOB 0x02u /* global exec, creates array of matches */
#define JSREG_MULTILINE 0x04u /* treat ^ and $ as begin and end of line */
#define JSREG_STICKY 0x08u /* only match starting at lastIndex */
extern JS_PUBLIC_API(JSObject *)
JS_NewRegExpObject(JSContext *cx, JS::HandleObject obj, char *bytes, size_t length,
unsigned flags);
extern JS_PUBLIC_API(JSObject *)
JS_NewUCRegExpObject(JSContext *cx, JS::HandleObject obj, jschar *chars, size_t length,
unsigned flags);
extern JS_PUBLIC_API(bool)
JS_SetRegExpInput(JSContext *cx, JS::HandleObject obj, JS::HandleString input,
bool multiline);
extern JS_PUBLIC_API(bool)
JS_ClearRegExpStatics(JSContext *cx, JS::HandleObject obj);
extern JS_PUBLIC_API(bool)
JS_ExecuteRegExp(JSContext *cx, JS::HandleObject obj, JS::HandleObject reobj,
jschar *chars, size_t length, size_t *indexp, bool test,
JS::MutableHandleValue rval);
/* RegExp interface for clients without a global object. */
extern JS_PUBLIC_API(JSObject *)
JS_NewRegExpObjectNoStatics(JSContext *cx, char *bytes, size_t length, unsigned flags);
extern JS_PUBLIC_API(JSObject *)
JS_NewUCRegExpObjectNoStatics(JSContext *cx, jschar *chars, size_t length, unsigned flags);
extern JS_PUBLIC_API(bool)
JS_ExecuteRegExpNoStatics(JSContext *cx, JS::HandleObject reobj, jschar *chars, size_t length,
size_t *indexp, bool test, JS::MutableHandleValue rval);
extern JS_PUBLIC_API(bool)
JS_ObjectIsRegExp(JSContext *cx, JS::HandleObject obj);
extern JS_PUBLIC_API(unsigned)
JS_GetRegExpFlags(JSContext *cx, JS::HandleObject obj);
extern JS_PUBLIC_API(JSString *)
JS_GetRegExpSource(JSContext *cx, JS::HandleObject obj);
/************************************************************************/
extern JS_PUBLIC_API(bool)
JS_IsExceptionPending(JSContext *cx);
extern JS_PUBLIC_API(bool)
JS_GetPendingException(JSContext *cx, JS::MutableHandleValue vp);
extern JS_PUBLIC_API(void)
JS_SetPendingException(JSContext *cx, JS::HandleValue v);
extern JS_PUBLIC_API(void)
JS_ClearPendingException(JSContext *cx);
extern JS_PUBLIC_API(bool)
JS_ReportPendingException(JSContext *cx);
namespace JS {
/*
* Save and later restore the current exception state of a given JSContext.
* This is useful for implementing behavior in C++ that's like try/catch
* or try/finally in JS.
*
* Typical usage:
*
* bool ok = JS_EvaluateScript(cx, ...);
* AutoSaveExceptionState savedExc(cx);
* ... cleanup that might re-enter JS ...
* return ok;
*/
class JS_PUBLIC_API(AutoSaveExceptionState)
{
private:
JSContext *context;
bool wasPropagatingForcedReturn;
bool wasThrowing;
RootedValue exceptionValue;
public:
/*
* Take a snapshot of cx's current exception state. Then clear any current
* pending exception in cx.
*/
explicit AutoSaveExceptionState(JSContext *cx);
/*
* If neither drop() nor restore() was called, restore the exception
* state only if no exception is currently pending on cx.
*/
~AutoSaveExceptionState();
/*
* Discard any stored exception state.
* If this is called, the destructor is a no-op.
*/
void drop() {
wasPropagatingForcedReturn = false;
wasThrowing = false;
exceptionValue.setUndefined();
}
/*
* Replace cx's exception state with the stored exception state. Then
* discard the stored exception state. If this is called, the
* destructor is a no-op.
*/
void restore();
};
} /* namespace JS */
/* Deprecated API. Use AutoSaveExceptionState instead. */
extern JS_PUBLIC_API(JSExceptionState *)
JS_SaveExceptionState(JSContext *cx);
extern JS_PUBLIC_API(void)
JS_RestoreExceptionState(JSContext *cx, JSExceptionState *state);
extern JS_PUBLIC_API(void)
JS_DropExceptionState(JSContext *cx, JSExceptionState *state);
/*
* If the given object is an exception object, the exception will have (or be
* able to lazily create) an error report struct, and this function will return
* the address of that struct. Otherwise, it returns nullptr. The lifetime
* of the error report struct that might be returned is the same as the
* lifetime of the exception object.
*/
extern JS_PUBLIC_API(JSErrorReport *)
JS_ErrorFromException(JSContext *cx, JS::HandleObject obj);
/*
* Throws a StopIteration exception on cx.
*/
extern JS_PUBLIC_API(bool)
JS_ThrowStopIteration(JSContext *cx);
extern JS_PUBLIC_API(bool)
JS_IsStopIteration(jsval v);
extern JS_PUBLIC_API(intptr_t)
JS_GetCurrentThread();
/*
* A JS runtime always has an "owner thread". The owner thread is set when the
* runtime is created (to the current thread) and practically all entry points
* into the JS engine check that a runtime (or anything contained in the
* runtime: context, compartment, object, etc) is only touched by its owner
* thread. Embeddings may check this invariant outside the JS engine by calling
* JS_AbortIfWrongThread (which will abort if not on the owner thread, even for
* non-debug builds).
*/
extern JS_PUBLIC_API(void)
JS_AbortIfWrongThread(JSRuntime *rt);
/************************************************************************/
/*
* A constructor can request that the JS engine create a default new 'this'
* object of the given class, using the callee to determine parentage and
* [[Prototype]].
*/
extern JS_PUBLIC_API(JSObject *)
JS_NewObjectForConstructor(JSContext *cx, const JSClass *clasp, const JS::CallArgs& args);
/************************************************************************/
#ifdef JS_GC_ZEAL
#define JS_DEFAULT_ZEAL_FREQ 100
extern JS_PUBLIC_API(void)
JS_SetGCZeal(JSContext *cx, uint8_t zeal, uint32_t frequency);
extern JS_PUBLIC_API(void)
JS_ScheduleGC(JSContext *cx, uint32_t count);
#endif
extern JS_PUBLIC_API(void)
JS_SetParallelParsingEnabled(JSRuntime *rt, bool enabled);
extern JS_PUBLIC_API(void)
JS_SetOffthreadIonCompilationEnabled(JSRuntime *rt, bool enabled);
#define JIT_COMPILER_OPTIONS(Register) \
Register(BASELINE_USECOUNT_TRIGGER, "baseline.usecount.trigger") \
Register(ION_USECOUNT_TRIGGER, "ion.usecount.trigger") \
Register(ION_ENABLE, "ion.enable") \
Register(BASELINE_ENABLE, "baseline.enable") \
Register(OFFTHREAD_COMPILATION_ENABLE, "offthread-compilation.enable") \
Register(SIGNALS_ENABLE, "signals.enable")
typedef enum JSJitCompilerOption {
#define JIT_COMPILER_DECLARE(key, str) \
JSJITCOMPILER_ ## key,
JIT_COMPILER_OPTIONS(JIT_COMPILER_DECLARE)
#undef JIT_COMPILER_DECLARE
JSJITCOMPILER_NOT_AN_OPTION
} JSJitCompilerOption;
extern JS_PUBLIC_API(void)
JS_SetGlobalJitCompilerOption(JSRuntime *rt, JSJitCompilerOption opt, uint32_t value);
extern JS_PUBLIC_API(int)
JS_GetGlobalJitCompilerOption(JSRuntime *rt, JSJitCompilerOption opt);
/*
* Convert a uint32_t index into a jsid.
*/
extern JS_PUBLIC_API(bool)
JS_IndexToId(JSContext *cx, uint32_t index, JS::MutableHandleId);
/*
* Convert chars into a jsid.
*
* |chars| may not be an index.
*/
extern JS_PUBLIC_API(bool)
JS_CharsToId(JSContext* cx, JS::TwoByteChars chars, JS::MutableHandleId);
/*
* Test if the given string is a valid ECMAScript identifier
*/
extern JS_PUBLIC_API(bool)
JS_IsIdentifier(JSContext *cx, JS::HandleString str, bool *isIdentifier);
namespace JS {
/*
* AutoFilename encapsulates a pointer to a C-string and keeps the C-string
* alive for as long as the associated AutoFilename object is alive.
*/
class MOZ_STACK_CLASS JS_PUBLIC_API(AutoFilename)
{
void *scriptSource_;
AutoFilename(const AutoFilename &) MOZ_DELETE;
void operator=(const AutoFilename &) MOZ_DELETE;
public:
AutoFilename() : scriptSource_(nullptr) {}
~AutoFilename() { reset(nullptr); }
const char *get() const;
void reset(void *newScriptSource);
};
/*
* Return the current filename and line number of the most currently running
* frame. Returns true if a scripted frame was found, false otherwise.
*
* If a the embedding has hidden the scripted caller for the topmost activation
* record, this will also return false.
*/
extern JS_PUBLIC_API(bool)
DescribeScriptedCaller(JSContext *cx, AutoFilename *filename = nullptr,
unsigned *lineno = nullptr);
extern JS_PUBLIC_API(JSObject *)
GetScriptedCallerGlobal(JSContext *cx);
/*
* Informs the JS engine that the scripted caller should be hidden. This can be
* used by the embedding to maintain an override of the scripted caller in its
* calculations, by hiding the scripted caller in the JS engine and pushing data
* onto a separate stack, which it inspects when DescribeScriptedCaller returns
* null.
*
* We maintain a counter on each activation record. Add() increments the counter
* of the topmost activation, and Remove() decrements it. The count may never
* drop below zero, and must always be exactly zero when the activation is
* popped from the stack.
*/
extern JS_PUBLIC_API(void)
HideScriptedCaller(JSContext *cx);
extern JS_PUBLIC_API(void)
UnhideScriptedCaller(JSContext *cx);
class AutoHideScriptedCaller
{
public:
explicit AutoHideScriptedCaller(JSContext *cx
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: mContext(cx)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
HideScriptedCaller(mContext);
}
~AutoHideScriptedCaller() {
UnhideScriptedCaller(mContext);
}
protected:
JSContext *mContext;
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
} /* namespace JS */
/*
* Encode/Decode interpreted scripts and functions to/from memory.
*/
extern JS_PUBLIC_API(void *)
JS_EncodeScript(JSContext *cx, JS::HandleScript script, uint32_t *lengthp);
extern JS_PUBLIC_API(void *)
JS_EncodeInterpretedFunction(JSContext *cx, JS::HandleObject funobj, uint32_t *lengthp);
extern JS_PUBLIC_API(JSScript *)
JS_DecodeScript(JSContext *cx, const void *data, uint32_t length, JSPrincipals *originPrincipals);
extern JS_PUBLIC_API(JSObject *)
JS_DecodeInterpretedFunction(JSContext *cx, const void *data, uint32_t length,
JSPrincipals *originPrincipals);
namespace JS {
/*
* This callback represents a request by the JS engine to open for reading the
* existing cache entry for the given global and char range that may contain a
* module. If a cache entry exists, the callback shall return 'true' and return
* the size, base address and an opaque file handle as outparams. If the
* callback returns 'true', the JS engine guarantees a call to
* CloseAsmJSCacheEntryForReadOp, passing the same base address, size and
* handle.
*/
typedef bool
(* OpenAsmJSCacheEntryForReadOp)(HandleObject global, const jschar *begin, const jschar *limit,
size_t *size, const uint8_t **memory, intptr_t *handle);
typedef void
(* CloseAsmJSCacheEntryForReadOp)(size_t size, const uint8_t *memory, intptr_t handle);
/*
* This callback represents a request by the JS engine to open for writing a
* cache entry of the given size for the given global and char range containing
* the just-compiled module. If cache entry space is available, the callback
* shall return 'true' and return the base address and an opaque file handle as
* outparams. If the callback returns 'true', the JS engine guarantees a call
* to CloseAsmJSCacheEntryForWriteOp passing the same base address, size and
* handle.
*
* If 'installed' is true, then the cache entry is associated with a permanently
* installed JS file (e.g., in a packaged webapp). This information allows the
* embedding to store the cache entry in a installed location associated with
* the principal of 'global' where it will not be evicted until the associated
* installed JS file is removed.
*/
typedef bool
(* OpenAsmJSCacheEntryForWriteOp)(HandleObject global, bool installed,
const jschar *begin, const jschar *end,
size_t size, uint8_t **memory, intptr_t *handle);
typedef void
(* CloseAsmJSCacheEntryForWriteOp)(size_t size, uint8_t *memory, intptr_t handle);
typedef js::Vector<char, 0, js::SystemAllocPolicy> BuildIdCharVector;
// Return the buildId (represented as a sequence of characters) associated with
// the currently-executing build. If the JS engine is embedded such that a
// single cache entry can be observed by different compiled versions of the JS
// engine, it is critical that the buildId shall change for each new build of
// the JS engine.
typedef bool
(* BuildIdOp)(BuildIdCharVector *buildId);
struct AsmJSCacheOps
{
OpenAsmJSCacheEntryForReadOp openEntryForRead;
CloseAsmJSCacheEntryForReadOp closeEntryForRead;
OpenAsmJSCacheEntryForWriteOp openEntryForWrite;
CloseAsmJSCacheEntryForWriteOp closeEntryForWrite;
BuildIdOp buildId;
};
extern JS_PUBLIC_API(void)
SetAsmJSCacheOps(JSRuntime *rt, const AsmJSCacheOps *callbacks);
/*
* Convenience class for imitating a JS level for-of loop. Typical usage:
*
* ForOfIterator it(cx);
* if (!it.init(iterable))
* return false;
* RootedValue val(cx);
* while (true) {
* bool done;
* if (!it.next(&val, &done))
* return false;
* if (done)
* break;
* if (!DoStuff(cx, val))
* return false;
* }
*/
class MOZ_STACK_CLASS JS_PUBLIC_API(ForOfIterator) {
protected:
JSContext *cx_;
/*
* Use the ForOfPIC on the global object (see vm/GlobalObject.h) to try
* to optimize iteration across arrays.
*
* Case 1: Regular Iteration
* iterator - pointer to the iterator object.
* index - fixed to NOT_ARRAY (== UINT32_MAX)
*
* Case 2: Optimized Array Iteration
* iterator - pointer to the array object.
* index - current position in array.
*
* The cases are distinguished by whether or not |index| is equal to NOT_ARRAY.
*/
JS::RootedObject iterator;
uint32_t index;
static const uint32_t NOT_ARRAY = UINT32_MAX;
ForOfIterator(const ForOfIterator &) MOZ_DELETE;
ForOfIterator &operator=(const ForOfIterator &) MOZ_DELETE;
public:
explicit ForOfIterator(JSContext *cx) : cx_(cx), iterator(cx_), index(NOT_ARRAY) { }
enum NonIterableBehavior {
ThrowOnNonIterable,
AllowNonIterable
};
/*
* Initialize the iterator. If AllowNonIterable is passed then if iterable
* does not have a callable @@iterator init() will just return true instead
* of throwing. Callers should then check valueIsIterable() before
* continuing with the iteration.
*/
bool init(JS::HandleValue iterable,
NonIterableBehavior nonIterableBehavior = ThrowOnNonIterable);
/*
* This method assumes that |iterator| is already an iterator. It will not
* check for, and call @@iterator. Callers should make sure that the passed
* in value is in fact an iterator.
*/
bool initWithIterator(JS::HandleValue aIterator);
/*
* Get the next value from the iterator. If false *done is true
* after this call, do not examine val.
*/
bool next(JS::MutableHandleValue val, bool *done);
/*
* If initialized with throwOnNonCallable = false, check whether
* the value is iterable.
*/
bool valueIsIterable() const {
return iterator;
}
private:
inline bool nextFromOptimizedArray(MutableHandleValue val, bool *done);
bool materializeArrayIterator();
};
/*
* If a large allocation fails, the JS engine may call the large-allocation-
* failure callback, if set, to allow the embedding to flush caches, possibly
* perform shrinking GCs, etc. to make some room so that the allocation will
* succeed if retried. After the callback returns, the JS engine will try to
* allocate again and may be succesful.
*/
typedef void
(* LargeAllocationFailureCallback)(void *data);
extern JS_PUBLIC_API(void)
SetLargeAllocationFailureCallback(JSRuntime *rt, LargeAllocationFailureCallback afc, void *data);
/*
* Unlike the error reporter, which is only called if the exception for an OOM
* bubbles up and is not caught, the OutOfMemoryCallback is called immediately
* at the OOM site to allow the embedding to capture the current state of heap
* allocation before anything is freed. If the large-allocation-failure callback
* is called at all (not all allocation sites call the large-allocation-failure
* callback on failure), it is called before the out-of-memory callback; the
* out-of-memory callback is only called if the allocation still fails after the
* large-allocation-failure callback has returned.
*/
typedef void
(* OutOfMemoryCallback)(JSContext *cx, void *data);
extern JS_PUBLIC_API(void)
SetOutOfMemoryCallback(JSRuntime *rt, OutOfMemoryCallback cb, void *data);
/*
* Capture the current call stack as a chain of SavedFrame objects, and set
* |stackp| to the SavedFrame for the newest stack frame. If |maxFrameCount| is
* non-zero, capture at most the youngest |maxFrameCount| frames.
*/
extern JS_PUBLIC_API(bool)
CaptureCurrentStack(JSContext *cx, MutableHandleObject stackp, unsigned maxFrameCount = 0);
} /* namespace JS */
#endif /* jsapi_h */