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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sw=4 et tw=78:
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef jsapi_h___
#define jsapi_h___
/*
* JavaScript API.
*/
#include <stddef.h>
#include <stdio.h>
#include "js-config.h"
#include "jspubtd.h"
#include "jsutil.h"
JS_BEGIN_EXTERN_C
/*
* In release builds, jsval and jsid are defined to be integral types. This
* prevents many bugs from being caught at compile time. E.g.:
*
* jsval v = ...
* if (v == JS_TRUE) // error
* ...
*
* jsid id = v; // error
*
* To catch more errors, jsval and jsid are given struct types in debug builds.
* Struct assignment and (in C++) operator== allow correct code to be mostly
* oblivious to the change. This feature can be explicitly disabled in debug
* builds by defining JS_NO_JSVAL_JSID_STRUCT_TYPES.
*/
#ifdef JS_USE_JSVAL_JSID_STRUCT_TYPES
/* Well-known JS values. N.B. These constants are initialized at startup. */
extern JS_PUBLIC_DATA(jsval) JSVAL_NULL;
extern JS_PUBLIC_DATA(jsval) JSVAL_ZERO;
extern JS_PUBLIC_DATA(jsval) JSVAL_ONE;
extern JS_PUBLIC_DATA(jsval) JSVAL_FALSE;
extern JS_PUBLIC_DATA(jsval) JSVAL_TRUE;
extern JS_PUBLIC_DATA(jsval) JSVAL_VOID;
#else
/* Well-known JS values. */
#define JSVAL_NULL BUILD_JSVAL(JSVAL_TAG_NULL, 0)
#define JSVAL_ZERO BUILD_JSVAL(JSVAL_TAG_INT32, 0)
#define JSVAL_ONE BUILD_JSVAL(JSVAL_TAG_INT32, 1)
#define JSVAL_FALSE BUILD_JSVAL(JSVAL_TAG_BOOLEAN, JS_FALSE)
#define JSVAL_TRUE BUILD_JSVAL(JSVAL_TAG_BOOLEAN, JS_TRUE)
#define JSVAL_VOID BUILD_JSVAL(JSVAL_TAG_UNDEFINED, 0)
#endif
/************************************************************************/
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_NULL(jsval v)
{
jsval_layout l;
l.asBits = JSVAL_BITS(v);
return JSVAL_IS_NULL_IMPL(l);
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_VOID(jsval v)
{
jsval_layout l;
l.asBits = JSVAL_BITS(v);
return JSVAL_IS_UNDEFINED_IMPL(l);
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_INT(jsval v)
{
jsval_layout l;
l.asBits = JSVAL_BITS(v);
return JSVAL_IS_INT32_IMPL(l);
}
static JS_ALWAYS_INLINE jsint
JSVAL_TO_INT(jsval v)
{
jsval_layout l;
JS_ASSERT(JSVAL_IS_INT(v));
l.asBits = JSVAL_BITS(v);
return JSVAL_TO_INT32_IMPL(l);
}
#define JSVAL_INT_BITS 32
#define JSVAL_INT_MIN ((jsint)0x80000000)
#define JSVAL_INT_MAX ((jsint)0x7fffffff)
static JS_ALWAYS_INLINE jsval
INT_TO_JSVAL(int32 i)
{
return IMPL_TO_JSVAL(INT32_TO_JSVAL_IMPL(i));
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_DOUBLE(jsval v)
{
jsval_layout l;
l.asBits = JSVAL_BITS(v);
return JSVAL_IS_DOUBLE_IMPL(l);
}
static JS_ALWAYS_INLINE jsdouble
JSVAL_TO_DOUBLE(jsval v)
{
jsval_layout l;
JS_ASSERT(JSVAL_IS_DOUBLE(v));
l.asBits = JSVAL_BITS(v);
return l.asDouble;
}
static JS_ALWAYS_INLINE jsval
DOUBLE_TO_JSVAL(jsdouble d)
{
d = JS_CANONICALIZE_NAN(d);
return IMPL_TO_JSVAL(DOUBLE_TO_JSVAL_IMPL(d));
}
static JS_ALWAYS_INLINE jsval
UINT_TO_JSVAL(uint32 i)
{
if (i <= JSVAL_INT_MAX)
return INT_TO_JSVAL((int32)i);
return DOUBLE_TO_JSVAL((jsdouble)i);
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_NUMBER(jsval v)
{
jsval_layout l;
l.asBits = JSVAL_BITS(v);
return JSVAL_IS_NUMBER_IMPL(l);
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_STRING(jsval v)
{
jsval_layout l;
l.asBits = JSVAL_BITS(v);
return JSVAL_IS_STRING_IMPL(l);
}
static JS_ALWAYS_INLINE JSString *
JSVAL_TO_STRING(jsval v)
{
jsval_layout l;
JS_ASSERT(JSVAL_IS_STRING(v));
l.asBits = JSVAL_BITS(v);
return JSVAL_TO_STRING_IMPL(l);
}
static JS_ALWAYS_INLINE jsval
STRING_TO_JSVAL(JSString *str)
{
return IMPL_TO_JSVAL(STRING_TO_JSVAL_IMPL(str));
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_OBJECT(jsval v)
{
jsval_layout l;
l.asBits = JSVAL_BITS(v);
return JSVAL_IS_OBJECT_OR_NULL_IMPL(l);
}
static JS_ALWAYS_INLINE JSObject *
JSVAL_TO_OBJECT(jsval v)
{
jsval_layout l;
JS_ASSERT(JSVAL_IS_OBJECT(v));
l.asBits = JSVAL_BITS(v);
return JSVAL_TO_OBJECT_IMPL(l);
}
static JS_ALWAYS_INLINE jsval
OBJECT_TO_JSVAL(JSObject *obj)
{
if (obj)
return IMPL_TO_JSVAL(OBJECT_TO_JSVAL_IMPL(obj));
return JSVAL_NULL;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_BOOLEAN(jsval v)
{
jsval_layout l;
l.asBits = JSVAL_BITS(v);
return JSVAL_IS_BOOLEAN_IMPL(l);
}
static JS_ALWAYS_INLINE JSBool
JSVAL_TO_BOOLEAN(jsval v)
{
jsval_layout l;
JS_ASSERT(JSVAL_IS_BOOLEAN(v));
l.asBits = JSVAL_BITS(v);
return JSVAL_TO_BOOLEAN_IMPL(l);
}
static JS_ALWAYS_INLINE jsval
BOOLEAN_TO_JSVAL(JSBool b)
{
return IMPL_TO_JSVAL(BOOLEAN_TO_JSVAL_IMPL(b));
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_PRIMITIVE(jsval v)
{
jsval_layout l;
l.asBits = JSVAL_BITS(v);
return JSVAL_IS_PRIMITIVE_IMPL(l);
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_GCTHING(jsval v)
{
jsval_layout l;
l.asBits = JSVAL_BITS(v);
return JSVAL_IS_GCTHING_IMPL(l);
}
static JS_ALWAYS_INLINE void *
JSVAL_TO_GCTHING(jsval v)
{
jsval_layout l;
JS_ASSERT(JSVAL_IS_GCTHING(v));
l.asBits = JSVAL_BITS(v);
return JSVAL_TO_GCTHING_IMPL(l);
}
/* To be GC-safe, privates are tagged as doubles. */
static JS_ALWAYS_INLINE jsval
PRIVATE_TO_JSVAL(void *ptr)
{
return IMPL_TO_JSVAL(PRIVATE_PTR_TO_JSVAL_IMPL(ptr));
}
static JS_ALWAYS_INLINE void *
JSVAL_TO_PRIVATE(jsval v)
{
jsval_layout l;
JS_ASSERT(JSVAL_IS_DOUBLE(v));
l.asBits = JSVAL_BITS(v);
return JSVAL_TO_PRIVATE_PTR_IMPL(l);
}
/************************************************************************/
/*
* A jsid is an identifier for a property or method of an object which is
* either a 31-bit signed integer, interned string or object. If XML is
* enabled, there is an additional singleton jsid value; see
* JS_DEFAULT_XML_NAMESPACE_ID below. Finally, there is an additional jsid
* value, JSID_VOID, which does not occur in JS scripts but may be used to
* indicate the absence of a valid jsid.
*
* A jsid is not implicitly convertible to or from a jsval; JS_ValueToId or
* JS_IdToValue must be used instead.
*/
#define JSID_TYPE_STRING 0x0
#define JSID_TYPE_INT 0x1
#define JSID_TYPE_VOID 0x2
#define JSID_TYPE_OBJECT 0x4
#define JSID_TYPE_DEFAULT_XML_NAMESPACE 0x6
#define JSID_TYPE_MASK 0x7
/*
* Avoid using canonical 'id' for jsid parameters since this is a magic word in
* Objective-C++ which, apparently, wants to be able to #include jsapi.h.
*/
#define id iden
static JS_ALWAYS_INLINE JSBool
JSID_IS_STRING(jsid id)
{
return (JSID_BITS(id) & JSID_TYPE_MASK) == 0;
}
static JS_ALWAYS_INLINE JSString *
JSID_TO_STRING(jsid id)
{
JS_ASSERT(JSID_IS_STRING(id));
return (JSString *)(JSID_BITS(id));
}
static JS_ALWAYS_INLINE JSBool
JSID_IS_ZERO(jsid id)
{
return JSID_BITS(id) == 0;
}
JS_PUBLIC_API(JSBool)
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.
*/
static JS_ALWAYS_INLINE jsid
INTERNED_STRING_TO_JSID(JSContext *cx, JSString *str)
{
jsid id;
JS_ASSERT(str);
JS_ASSERT(((size_t)str & JSID_TYPE_MASK) == 0);
JS_ASSERT(JS_StringHasBeenInterned(cx, str));
JSID_BITS(id) = (size_t)str;
return id;
}
static JS_ALWAYS_INLINE JSBool
JSID_IS_INT(jsid id)
{
return !!(JSID_BITS(id) & JSID_TYPE_INT);
}
static JS_ALWAYS_INLINE int32
JSID_TO_INT(jsid id)
{
JS_ASSERT(JSID_IS_INT(id));
return ((int32)JSID_BITS(id)) >> 1;
}
/*
* Note: when changing these values, verify that their use in
* js_CheckForStringIndex is still valid.
*/
#define JSID_INT_MIN (-(1 << 30))
#define JSID_INT_MAX ((1 << 30) - 1)
static JS_ALWAYS_INLINE JSBool
INT_FITS_IN_JSID(int32 i)
{
return ((jsuint)(i) - (jsuint)JSID_INT_MIN <=
(jsuint)(JSID_INT_MAX - JSID_INT_MIN));
}
static JS_ALWAYS_INLINE jsid
INT_TO_JSID(int32 i)
{
jsid id;
JS_ASSERT(INT_FITS_IN_JSID(i));
JSID_BITS(id) = ((i << 1) | JSID_TYPE_INT);
return id;
}
static JS_ALWAYS_INLINE JSBool
JSID_IS_OBJECT(jsid id)
{
return (JSID_BITS(id) & JSID_TYPE_MASK) == JSID_TYPE_OBJECT &&
(size_t)JSID_BITS(id) != JSID_TYPE_OBJECT;
}
static JS_ALWAYS_INLINE JSObject *
JSID_TO_OBJECT(jsid id)
{
JS_ASSERT(JSID_IS_OBJECT(id));
return (JSObject *)(JSID_BITS(id) & ~(size_t)JSID_TYPE_MASK);
}
static JS_ALWAYS_INLINE jsid
OBJECT_TO_JSID(JSObject *obj)
{
jsid id;
JS_ASSERT(obj != NULL);
JS_ASSERT(((size_t)obj & JSID_TYPE_MASK) == 0);
JSID_BITS(id) = ((size_t)obj | JSID_TYPE_OBJECT);
return id;
}
static JS_ALWAYS_INLINE JSBool
JSID_IS_GCTHING(jsid id)
{
return JSID_IS_STRING(id) || JSID_IS_OBJECT(id);
}
static JS_ALWAYS_INLINE void *
JSID_TO_GCTHING(jsid id)
{
return (void *)(JSID_BITS(id) & ~(size_t)JSID_TYPE_MASK);
}
/*
* The magic XML namespace id is not a valid jsid. Global object classes in
* embeddings that enable JS_HAS_XML_SUPPORT (E4X) should handle this id.
*/
static JS_ALWAYS_INLINE JSBool
JSID_IS_DEFAULT_XML_NAMESPACE(jsid id)
{
JS_ASSERT_IF(((size_t)JSID_BITS(id) & JSID_TYPE_MASK) == JSID_TYPE_DEFAULT_XML_NAMESPACE,
JSID_BITS(id) == JSID_TYPE_DEFAULT_XML_NAMESPACE);
return ((size_t)JSID_BITS(id) == JSID_TYPE_DEFAULT_XML_NAMESPACE);
}
#ifdef JS_USE_JSVAL_JSID_STRUCT_TYPES
extern JS_PUBLIC_DATA(jsid) JS_DEFAULT_XML_NAMESPACE_ID;
#else
#define JS_DEFAULT_XML_NAMESPACE_ID ((jsid)JSID_TYPE_DEFAULT_XML_NAMESPACE)
#endif
/*
* A void jsid is not a valid id and only arises as an exceptional API return
* value, such as in JS_NextProperty. Embeddings must not pass JSID_VOID into
* JSAPI entry points expecting a jsid and do not need to handle JSID_VOID in
* hooks receiving a jsid except when explicitly noted in the API contract.
*/
static JS_ALWAYS_INLINE JSBool
JSID_IS_VOID(jsid id)
{
JS_ASSERT_IF(((size_t)JSID_BITS(id) & JSID_TYPE_MASK) == JSID_TYPE_VOID,
JSID_BITS(id) == JSID_TYPE_VOID);
return ((size_t)JSID_BITS(id) == JSID_TYPE_VOID);
}
static JS_ALWAYS_INLINE JSBool
JSID_IS_EMPTY(jsid id)
{
return ((size_t)JSID_BITS(id) == JSID_TYPE_OBJECT);
}
#undef id
#ifdef JS_USE_JSVAL_JSID_STRUCT_TYPES
extern JS_PUBLIC_DATA(jsid) JSID_VOID;
extern JS_PUBLIC_DATA(jsid) JSID_EMPTY;
#else
# define JSID_VOID ((jsid)JSID_TYPE_VOID)
# define JSID_EMPTY ((jsid)JSID_TYPE_OBJECT)
#endif
/************************************************************************/
/* Lock and unlock the GC thing held by a jsval. */
#define JSVAL_LOCK(cx,v) (JSVAL_IS_GCTHING(v) \
? JS_LockGCThing(cx, JSVAL_TO_GCTHING(v)) \
: JS_TRUE)
#define JSVAL_UNLOCK(cx,v) (JSVAL_IS_GCTHING(v) \
? JS_UnlockGCThing(cx, JSVAL_TO_GCTHING(v)) \
: JS_TRUE)
/* 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 */
#define JSPROP_PERMANENT 0x04 /* property cannot be deleted */
#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 (jsint) index */
#define JSPROP_SHORTID 0x100 /* set in JS_DefineProperty attrs
if getters/setters use a shortid */
#define JSPROP_NATIVE_ACCESSORS 0x08 /* set in JSPropertyDescriptor.flags
if getters/setters are JSNatives */
/* Function flags, internal use only, returned by JS_GetFunctionFlags. */
#define JSFUN_LAMBDA 0x08 /* expressed, not declared, function */
#define JSFUN_HEAVYWEIGHT 0x80 /* activation requires a Call object */
#define JSFUN_HEAVYWEIGHT_TEST(f) ((f) & JSFUN_HEAVYWEIGHT)
/* 0x0100 is unused */
#define JSFUN_CONSTRUCTOR 0x0200 /* native that can be called as a ctor
without creating a this object */
#define JSFUN_FLAGS_MASK 0x07f8 /* overlay JSFUN_* attributes --
bits 12-15 are used internally to
flag interpreted functions */
#define JSFUN_STUB_GSOPS 0x1000 /* use JS_PropertyStub getter/setter
instead of defaulting to class gsops
for property holding function */
/*
* Re-use JSFUN_LAMBDA, which applies only to scripted functions, for use in
* JSFunctionSpec arrays that specify 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 JSFUN_LAMBDA
/*
* Microseconds since the epoch, midnight, January 1, 1970 UTC. See the
* comment in jstypes.h regarding safe int64 usage.
*/
extern JS_PUBLIC_API(int64)
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 JSBool Boolean
* c uint16/jschar ECMA uint16, Unicode char
* i int32 ECMA int32
* u uint32 ECMA uint32
* j int32 Rounded int32 (coordinate)
* d jsdouble IEEE double
* I jsdouble 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(JSBool)
JS_ConvertArguments(JSContext *cx, uintN argc, jsval *argv, const char *format,
...);
#ifdef va_start
extern JS_PUBLIC_API(JSBool)
JS_ConvertArgumentsVA(JSContext *cx, uintN argc, jsval *argv,
const char *format, va_list ap);
#endif
#ifdef JS_ARGUMENT_FORMATTER_DEFINED
/*
* Add and remove a format string handler for JS_{Convert,Push}Arguments{,VA}.
* The handler function has this signature (see jspubtd.h):
*
* JSBool MyArgumentFormatter(JSContext *cx, const char *format,
* JSBool fromJS, jsval **vpp, va_list *app);
*
* It should return true on success, and return false after reporting an error
* or detecting an already-reported error.
*
* For a given format string, for example "AA", the formatter is called from
* JS_ConvertArgumentsVA like so:
*
* formatter(cx, "AA...", JS_TRUE, &sp, &ap);
*
* sp points into the arguments array on the JS stack, while ap points into
* the stdarg.h va_list on the C stack. The JS_TRUE passed for fromJS tells
* the formatter to convert zero or more jsvals at sp to zero or more C values
* accessed via pointers-to-values at ap, updating both sp (via *vpp) and ap
* (via *app) to point past the converted arguments and their result pointers
* on the C stack.
*
* When called from JS_PushArgumentsVA, the formatter is invoked thus:
*
* formatter(cx, "AA...", JS_FALSE, &sp, &ap);
*
* where JS_FALSE for fromJS means to wrap the C values at ap according to the
* format specifier and store them at sp, updating ap and sp appropriately.
*
* The "..." after "AA" is the rest of the format string that was passed into
* JS_{Convert,Push}Arguments{,VA}. The actual format trailing substring used
* in each Convert or PushArguments call is passed to the formatter, so that
* one such function may implement several formats, in order to share code.
*
* Remove just forgets about any handler associated with format. Add does not
* copy format, it points at the string storage allocated by the caller, which
* is typically a string constant. If format is in dynamic storage, it is up
* to the caller to keep the string alive until Remove is called.
*/
extern JS_PUBLIC_API(JSBool)
JS_AddArgumentFormatter(JSContext *cx, const char *format,
JSArgumentFormatter formatter);
extern JS_PUBLIC_API(void)
JS_RemoveArgumentFormatter(JSContext *cx, const char *format);
#endif /* JS_ARGUMENT_FORMATTER_DEFINED */
extern JS_PUBLIC_API(JSBool)
JS_ConvertValue(JSContext *cx, jsval v, JSType type, jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_ValueToObject(JSContext *cx, jsval v, JSObject **objp);
extern JS_PUBLIC_API(JSFunction *)
JS_ValueToFunction(JSContext *cx, jsval v);
extern JS_PUBLIC_API(JSFunction *)
JS_ValueToConstructor(JSContext *cx, jsval v);
extern JS_PUBLIC_API(JSString *)
JS_ValueToString(JSContext *cx, jsval v);
extern JS_PUBLIC_API(JSString *)
JS_ValueToSource(JSContext *cx, jsval v);
extern JS_PUBLIC_API(JSBool)
JS_ValueToNumber(JSContext *cx, jsval v, jsdouble *dp);
extern JS_PUBLIC_API(JSBool)
JS_DoubleIsInt32(jsdouble d, jsint *ip);
extern JS_PUBLIC_API(int32)
JS_DoubleToInt32(jsdouble d);
extern JS_PUBLIC_API(uint32)
JS_DoubleToUint32(jsdouble d);
/*
* Convert a value to a number, then to an int32, according to the ECMA rules
* for ToInt32.
*/
extern JS_PUBLIC_API(JSBool)
JS_ValueToECMAInt32(JSContext *cx, jsval v, int32 *ip);
/*
* Convert a value to a number, then to a uint32, according to the ECMA rules
* for ToUint32.
*/
extern JS_PUBLIC_API(JSBool)
JS_ValueToECMAUint32(JSContext *cx, jsval v, uint32 *ip);
/*
* Convert a value to a number, then to an int32 if it fits by rounding to
* nearest; but failing with an error report if the double is out of range
* or unordered.
*/
extern JS_PUBLIC_API(JSBool)
JS_ValueToInt32(JSContext *cx, jsval v, int32 *ip);
/*
* ECMA ToUint16, for mapping a jsval to a Unicode point.
*/
extern JS_PUBLIC_API(JSBool)
JS_ValueToUint16(JSContext *cx, jsval v, uint16 *ip);
extern JS_PUBLIC_API(JSBool)
JS_ValueToBoolean(JSContext *cx, jsval v, JSBool *bp);
extern JS_PUBLIC_API(JSType)
JS_TypeOfValue(JSContext *cx, jsval v);
extern JS_PUBLIC_API(const char *)
JS_GetTypeName(JSContext *cx, JSType type);
extern JS_PUBLIC_API(JSBool)
JS_StrictlyEqual(JSContext *cx, jsval v1, jsval v2, JSBool *equal);
extern JS_PUBLIC_API(JSBool)
JS_LooselyEqual(JSContext *cx, jsval v1, jsval v2, JSBool *equal);
extern JS_PUBLIC_API(JSBool)
JS_SameValue(JSContext *cx, jsval v1, jsval v2, JSBool *same);
/* True iff fun is the global eval function. */
extern JS_PUBLIC_API(JSBool)
JS_IsBuiltinEvalFunction(JSFunction *fun);
/* True iff fun is the Function constructor. */
extern JS_PUBLIC_API(JSBool)
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
*/
#define JS_NewRuntime JS_Init
#define JS_DestroyRuntime JS_Finish
#define JS_LockRuntime JS_Lock
#define JS_UnlockRuntime JS_Unlock
extern JS_PUBLIC_API(JSRuntime *)
JS_NewRuntime(uint32 maxbytes);
/* Deprecated. */
#define JS_CommenceRuntimeShutDown(rt) ((void) 0)
extern JS_PUBLIC_API(void)
JS_DestroyRuntime(JSRuntime *rt);
extern JS_PUBLIC_API(void)
JS_ShutDown(void);
JS_PUBLIC_API(void *)
JS_GetRuntimePrivate(JSRuntime *rt);
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);
/* Yield to pending GC operations, regardless of request depth */
extern JS_PUBLIC_API(void)
JS_YieldRequest(JSContext *cx);
extern JS_PUBLIC_API(jsrefcount)
JS_SuspendRequest(JSContext *cx);
extern JS_PUBLIC_API(void)
JS_ResumeRequest(JSContext *cx, jsrefcount saveDepth);
extern JS_PUBLIC_API(JSBool)
JS_IsInRequest(JSContext *cx);
#ifdef __cplusplus
JS_END_EXTERN_C
class JSAutoRequest {
public:
JSAutoRequest(JSContext *cx JS_GUARD_OBJECT_NOTIFIER_PARAM)
: mContext(cx), mSaveDepth(0) {
JS_GUARD_OBJECT_NOTIFIER_INIT;
JS_BeginRequest(mContext);
}
~JSAutoRequest() {
JS_EndRequest(mContext);
}
void suspend() {
mSaveDepth = JS_SuspendRequest(mContext);
}
void resume() {
JS_ResumeRequest(mContext, mSaveDepth);
}
protected:
JSContext *mContext;
jsrefcount mSaveDepth;
JS_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 JSAutoSuspendRequest {
public:
JSAutoSuspendRequest(JSContext *cx JS_GUARD_OBJECT_NOTIFIER_PARAM)
: mContext(cx), mSaveDepth(0) {
JS_GUARD_OBJECT_NOTIFIER_INIT;
if (mContext) {
mSaveDepth = JS_SuspendRequest(mContext);
}
}
~JSAutoSuspendRequest() {
resume();
}
void resume() {
if (mContext) {
JS_ResumeRequest(mContext, mSaveDepth);
mContext = 0;
}
}
protected:
JSContext *mContext;
jsrefcount mSaveDepth;
JS_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:
JSAutoCheckRequest(JSContext *cx JS_GUARD_OBJECT_NOTIFIER_PARAM) {
#if defined JS_THREADSAFE && defined DEBUG
mContext = cx;
JS_ASSERT(JS_IsInRequest(cx));
#endif
JS_GUARD_OBJECT_NOTIFIER_INIT;
}
~JSAutoCheckRequest() {
#if defined JS_THREADSAFE && defined DEBUG
JS_ASSERT(JS_IsInRequest(mContext));
#endif
}
private:
#if defined JS_THREADSAFE && defined DEBUG
JSContext *mContext;
#endif
JS_DECL_USE_GUARD_OBJECT_NOTIFIER
};
JS_BEGIN_EXTERN_C
#endif
extern JS_PUBLIC_API(void)
JS_Lock(JSRuntime *rt);
extern JS_PUBLIC_API(void)
JS_Unlock(JSRuntime *rt);
extern JS_PUBLIC_API(JSContextCallback)
JS_SetContextCallback(JSRuntime *rt, JSContextCallback cxCallback);
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_DestroyContextMaybeGC(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(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);
extern JS_PUBLIC_API(JSVersion)
JS_SetVersion(JSContext *cx, JSVersion version);
extern JS_PUBLIC_API(const char *)
JS_VersionToString(JSVersion version);
extern JS_PUBLIC_API(JSVersion)
JS_StringToVersion(const char *string);
/*
* JS options are orthogonal to version, and may be freely composed with one
* another as well as with version.
*
* JSOPTION_VAROBJFIX is recommended -- see the comments associated with the
* prototypes for JS_ExecuteScript, JS_EvaluateScript, etc.
*/
#define JSOPTION_STRICT JS_BIT(0) /* warn on dubious practice */
#define JSOPTION_WERROR JS_BIT(1) /* convert warning to error */
#define JSOPTION_VAROBJFIX JS_BIT(2) /* make JS_EvaluateScript use
the last object on its 'obj'
param's scope chain as the
ECMA 'variables object' */
#define JSOPTION_PRIVATE_IS_NSISUPPORTS \
JS_BIT(3) /* context private data points
to an nsISupports subclass */
#define JSOPTION_COMPILE_N_GO JS_BIT(4) /* caller of JS_Compile*Script
promises to execute compiled
script once only; enables
compile-time scope chain
resolution of consts. */
#define JSOPTION_ATLINE JS_BIT(5) /* //@line number ["filename"]
option supported for the
XUL preprocessor and kindred
beasts. */
#define JSOPTION_XML JS_BIT(6) /* EMCAScript for XML support:
parse <!-- --> as a token,
not backward compatible with
the comment-hiding hack used
in HTML script tags. */
#define JSOPTION_DONT_REPORT_UNCAUGHT \
JS_BIT(8) /* When returning from the
outermost API call, prevent
uncaught exceptions from
being converted to error
reports */
#define JSOPTION_RELIMIT JS_BIT(9) /* Throw exception on any
regular expression which
backtracks more than n^3
times, where n is length
of the input string */
/* JS_BIT(10) is currently unused. */
#define JSOPTION_JIT JS_BIT(11) /* Enable JIT compilation. */
#define JSOPTION_NO_SCRIPT_RVAL JS_BIT(12) /* A promise to the compiler
that a null rval out-param
will be passed to each call
to JS_ExecuteScript. */
#define JSOPTION_UNROOTED_GLOBAL JS_BIT(13) /* The GC will not root the
contexts' global objects
(see JS_GetGlobalObject),
leaving that up to the
embedding. */
#define JSOPTION_METHODJIT JS_BIT(14) /* Whole-method JIT. */
#define JSOPTION_PROFILING JS_BIT(15) /* Profiler to make tracer/methodjit choices. */
#define JSOPTION_METHODJIT_ALWAYS \
JS_BIT(16) /* Always whole-method JIT,
don't tune at run-time. */
#define JSOPTION_PCCOUNT JS_BIT(17) /* Collect per-op execution counts */
#define JSOPTION_TYPE_INFERENCE JS_BIT(18) /* Perform type inference. */
/* Options which reflect compile-time properties of scripts. */
#define JSCOMPILEOPTION_MASK (JSOPTION_XML)
#define JSRUNOPTION_MASK (JS_BITMASK(19) & ~JSCOMPILEOPTION_MASK)
#define JSALLOPTION_MASK (JSCOMPILEOPTION_MASK | JSRUNOPTION_MASK)
extern JS_PUBLIC_API(uint32)
JS_GetOptions(JSContext *cx);
extern JS_PUBLIC_API(uint32)
JS_SetOptions(JSContext *cx, uint32 options);
extern JS_PUBLIC_API(uint32)
JS_ToggleOptions(JSContext *cx, uint32 options);
extern JS_PUBLIC_API(const char *)
JS_GetImplementationVersion(void);
extern JS_PUBLIC_API(JSCompartmentCallback)
JS_SetCompartmentCallback(JSRuntime *rt, JSCompartmentCallback callback);
extern JS_PUBLIC_API(JSWrapObjectCallback)
JS_SetWrapObjectCallbacks(JSRuntime *rt,
JSWrapObjectCallback callback,
JSPreWrapCallback precallback);
extern JS_PUBLIC_API(JSCrossCompartmentCall *)
JS_EnterCrossCompartmentCall(JSContext *cx, JSObject *target);
extern JS_PUBLIC_API(void)
JS_LeaveCrossCompartmentCall(JSCrossCompartmentCall *call);
extern JS_PUBLIC_API(void *)
JS_SetCompartmentPrivate(JSContext *cx, JSCompartment *compartment, void *data);
extern JS_PUBLIC_API(void *)
JS_GetCompartmentPrivate(JSContext *cx, JSCompartment *compartment);
extern JS_PUBLIC_API(JSBool)
JS_WrapObject(JSContext *cx, JSObject **objp);
extern JS_PUBLIC_API(JSBool)
JS_WrapValue(JSContext *cx, jsval *vp);
extern JS_PUBLIC_API(JSObject *)
JS_TransplantObject(JSContext *cx, JSObject *origobj, JSObject *target);
extern JS_FRIEND_API(JSObject *)
js_TransplantObjectWithWrapper(JSContext *cx,
JSObject *origobj,
JSObject *origwrapper,
JSObject *targetobj,
JSObject *targetwrapper);
extern JS_FRIEND_API(JSObject *)
js_TransplantObjectWithWrapper(JSContext *cx,
JSObject *origobj,
JSObject *origwrapper,
JSObject *targetobj,
JSObject *targetwrapper);
#ifdef __cplusplus
JS_END_EXTERN_C
class JS_PUBLIC_API(JSAutoEnterCompartment)
{
JSCrossCompartmentCall *call;
public:
JSAutoEnterCompartment() : call(NULL) {}
bool enter(JSContext *cx, JSObject *target);
void enterAndIgnoreErrors(JSContext *cx, JSObject *target);
bool entered() const { return call != NULL; }
~JSAutoEnterCompartment() {
if (call && call != reinterpret_cast<JSCrossCompartmentCall*>(1))
JS_LeaveCrossCompartmentCall(call);
}
void swap(JSAutoEnterCompartment &other) {
JSCrossCompartmentCall *tmp = call;
call = other.call;
other.call = tmp;
}
};
JS_BEGIN_EXTERN_C
#endif
extern JS_PUBLIC_API(JSObject *)
JS_GetGlobalObject(JSContext *cx);
extern JS_PUBLIC_API(void)
JS_SetGlobalObject(JSContext *cx, JSObject *obj);
/*
* 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(JSBool)
JS_InitStandardClasses(JSContext *cx, 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 JSBool 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(JSBool)
JS_ResolveStandardClass(JSContext *cx, JSObject *obj, jsid id,
JSBool *resolved);
extern JS_PUBLIC_API(JSBool)
JS_EnumerateStandardClasses(JSContext *cx, JSObject *obj);
/*
* Enumerate any already-resolved standard class ids into ida, or into a new
* JSIdArray if ida is null. Return the augmented array on success, null on
* failure with ida (if it was non-null on entry) destroyed.
*/
extern JS_PUBLIC_API(JSIdArray *)
JS_EnumerateResolvedStandardClasses(JSContext *cx, JSObject *obj,
JSIdArray *ida);
extern JS_PUBLIC_API(JSBool)
JS_GetClassObject(JSContext *cx, JSObject *obj, JSProtoKey key,
JSObject **objp);
extern JS_PUBLIC_API(JSObject *)
JS_GetScopeChain(JSContext *cx);
extern JS_PUBLIC_API(JSObject *)
JS_GetGlobalForObject(JSContext *cx, JSObject *obj);
extern JS_PUBLIC_API(JSObject *)
JS_GetGlobalForScopeChain(JSContext *cx);
/*
* Initialize the 'Reflect' object on a global object.
*/
extern JS_PUBLIC_API(JSObject *)
JS_InitReflect(JSContext *cx, JSObject *global);
#ifdef JS_HAS_CTYPES
/*
* Initialize the 'ctypes' object on a global variable 'obj'. The 'ctypes'
* object will be sealed.
*/
extern JS_PUBLIC_API(JSBool)
JS_InitCTypesClass(JSContext *cx, JSObject *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 NULL 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(JSBool)
JS_SetCTypesCallbacks(JSContext *cx, JSObject *ctypesObj, JSCTypesCallbacks *callbacks);
#endif
typedef JSBool
(* 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);
/*
* Macros to hide interpreter stack layout details from a JSFastNative using
* its jsval *vp parameter. The stack layout underlying invocation can't change
* without breaking source and binary compatibility (argv[-2] is well-known to
* be the callee jsval, and argv[-1] is as well known to be |this|).
*
* Note well: However, argv[-1] may be JSVAL_NULL where with slow natives it
* is the global object, so embeddings implementing fast natives *must* call
* JS_THIS or JS_THIS_OBJECT and test for failure indicated by a null return,
* which should propagate as a false return from native functions and hooks.
*
* To reduce boilerplace checks, JS_InstanceOf and JS_GetInstancePrivate now
* handle a null obj parameter by returning false (throwing a TypeError if
* given non-null argv), so most native functions that type-check their |this|
* parameter need not add null checking.
*
* NB: there is an anti-dependency between JS_CALLEE and JS_SET_RVAL: native
* methods that may inspect their callee must defer setting their return value
* until after any such possible inspection. Otherwise the return value will be
* inspected instead of the callee function object.
*
* WARNING: These are not (yet) mandatory macros, but new code outside of the
* engine should use them. In the Mozilla 2.0 milestone their definitions may
* change incompatibly.
*
* N.B. constructors must not use JS_THIS, as no 'this' object has been created.
*/
#define JS_CALLEE(cx,vp) ((vp)[0])
#define JS_THIS(cx,vp) JS_ComputeThis(cx, vp)
#define JS_THIS_OBJECT(cx,vp) (JSVAL_TO_OBJECT(JS_THIS(cx,vp)))
#define JS_ARGV(cx,vp) ((vp) + 2)
#define JS_RVAL(cx,vp) (*(vp))
#define JS_SET_RVAL(cx,vp,v) (*(vp) = (v))
extern JS_PUBLIC_API(jsval)
JS_ComputeThis(JSContext *cx, jsval *vp);
#ifdef __cplusplus
#undef JS_THIS
static inline jsval
JS_THIS(JSContext *cx, jsval *vp)
{
return JSVAL_IS_PRIMITIVE(vp[1]) ? JS_ComputeThis(cx, vp) : vp[1];
}
#endif
/*
* |this| is passed to functions in ES5 without change. Functions themselves
* do any post-processing they desire to box |this|, compute the global object,
* &c. Use this macro to retrieve a function's unboxed |this| value.
*
* This macro must not be used in conjunction with JS_THIS or JS_THIS_OBJECT,
* or vice versa. Either use the provided this value with this macro, or
* compute the boxed this value using those.
*
* N.B. constructors must not use JS_THIS_VALUE, as no 'this' object has been
* created.
*/
#define JS_THIS_VALUE(cx,vp) ((vp)[1])
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);
extern JS_PUBLIC_API(void)
JS_free(JSContext *cx, void *p);
extern JS_PUBLIC_API(void)
JS_updateMallocCounter(JSContext *cx, size_t nbytes);
extern JS_PUBLIC_API(char *)
JS_strdup(JSContext *cx, const char *s);
extern JS_PUBLIC_API(JSBool)
JS_NewNumberValue(JSContext *cx, jsdouble d, jsval *rval);
/*
* 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_AddNamedRootedValue(cx, &v, "name");
*
* the caller must perform
*
* JS_RemoveRootedValue(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(JSBool)
JS_AddValueRoot(JSContext *cx, jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_AddStringRoot(JSContext *cx, JSString **rp);
extern JS_PUBLIC_API(JSBool)
JS_AddObjectRoot(JSContext *cx, JSObject **rp);
extern JS_PUBLIC_API(JSBool)
JS_AddGCThingRoot(JSContext *cx, void **rp);
#ifdef NAME_ALL_GC_ROOTS
#define JS_DEFINE_TO_TOKEN(def) #def
#define JS_DEFINE_TO_STRING(def) JS_DEFINE_TO_TOKEN(def)
#define JS_AddValueRoot(cx,vp) JS_AddNamedValueRoot((cx), (vp), (__FILE__ ":" JS_TOKEN_TO_STRING(__LINE__))
#define JS_AddStringRoot(cx,rp) JS_AddNamedStringRoot((cx), (rp), (__FILE__ ":" JS_TOKEN_TO_STRING(__LINE__))
#define JS_AddObjectRoot(cx,rp) JS_AddNamedObjectRoot((cx), (rp), (__FILE__ ":" JS_TOKEN_TO_STRING(__LINE__))
#define JS_AddGCThingRoot(cx,rp) JS_AddNamedGCThingRoot((cx), (rp), (__FILE__ ":" JS_TOKEN_TO_STRING(__LINE__))
#endif
extern JS_PUBLIC_API(JSBool)
JS_AddNamedValueRoot(JSContext *cx, jsval *vp, const char *name);
extern JS_PUBLIC_API(JSBool)
JS_AddNamedStringRoot(JSContext *cx, JSString **rp, const char *name);
extern JS_PUBLIC_API(JSBool)
JS_AddNamedObjectRoot(JSContext *cx, JSObject **rp, const char *name);
extern JS_PUBLIC_API(JSBool)
JS_AddNamedGCThingRoot(JSContext *cx, void **rp, const char *name);
extern JS_PUBLIC_API(JSBool)
JS_RemoveValueRoot(JSContext *cx, jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_RemoveStringRoot(JSContext *cx, JSString **rp);
extern JS_PUBLIC_API(JSBool)
JS_RemoveObjectRoot(JSContext *cx, JSObject **rp);
extern JS_PUBLIC_API(JSBool)
JS_RemoveGCThingRoot(JSContext *cx, void **rp);
/* TODO: remove these APIs */
extern JS_FRIEND_API(JSBool)
js_AddRootRT(JSRuntime *rt, jsval *vp, const char *name);
extern JS_FRIEND_API(JSBool)
js_AddGCThingRootRT(JSRuntime *rt, void **rp, const char *name);
extern JS_FRIEND_API(JSBool)
js_RemoveRoot(JSRuntime *rt, void *rp);
#ifdef __cplusplus
JS_END_EXTERN_C
namespace JS {
/*
* Protecting non-jsval, non-JSObject *, non-JSString * values from collection
*
* Most of the time, the garbage collector's conservative stack scanner works
* behind the scenes, finding all live values and protecting them from being
* collected. However, when JSAPI client code obtains a pointer to data the
* scanner does not know about, owned by an object the scanner does know about,
* Care Must Be Taken.
*
* The scanner recognizes only a select set of types: pointers to JSObjects and
* similar things (JSFunctions, and so on), pointers to JSStrings, and jsvals.
* So while the scanner finds all live |JSString| pointers, it does not notice
* |jschar| pointers.
*
* So suppose we have:
*
* void f(JSString *str) {
* const jschar *ch = JS_GetStringCharsZ(str);
* ... do stuff with ch, but no uses of str ...;
* }
*
* After the call to |JS_GetStringCharsZ|, there are no further uses of
* |str|, which means that the compiler is within its rights to not store
* it anywhere. But because the stack scanner will not notice |ch|, there
* is no longer any live value in this frame that would keep the string
* alive. If |str| is the last reference to that |JSString|, and the
* collector runs while we are using |ch|, the string's array of |jschar|s
* may be freed out from under us.
*
* Note that there is only an issue when 1) we extract a thing X the scanner
* doesn't recognize from 2) a thing Y the scanner does recognize, and 3) if Y
* gets garbage-collected, then X gets freed. If we have code like this:
*
* void g(JSObject *obj) {
* jsval x;
* JS_GetProperty(obj, "x", &x);
* ... do stuff with x ...
* }
*
* there's no problem, because the value we've extracted, x, is a jsval, a
* type that the conservative scanner recognizes.
*
* Conservative GC frees us from the obligation to explicitly root the types it
* knows about, but when we work with derived values like |ch|, we must root
* their owners, as the derived value alone won't keep them alive.
*
* A JS::Anchor is a kind of GC root that allows us to keep the owners of
* derived values like |ch| alive throughout the Anchor's lifetime. We could
* fix the above code as follows:
*
* void f(JSString *str) {
* JS::Anchor<JSString *> a_str(str);
* const jschar *ch = JS_GetStringCharsZ(str);
* ... do stuff with ch, but no uses of str ...;
* }
*
* This simply ensures that |str| will be live until |a_str| goes out of scope.
* As long as we don't retain a pointer to the string's characters for longer
* than that, we have avoided all garbage collection hazards.
*/
template<typename T> class AnchorPermitted;
template<> class AnchorPermitted<JSObject *> { };
template<> class AnchorPermitted<const JSObject *> { };
template<> class AnchorPermitted<JSFunction *> { };
template<> class AnchorPermitted<const JSFunction *> { };
template<> class AnchorPermitted<JSString *> { };
template<> class AnchorPermitted<const JSString *> { };
template<> class AnchorPermitted<jsval> { };
template<typename T>
class Anchor: AnchorPermitted<T> {
public:
Anchor() { }
explicit Anchor(T t) { hold = t; }
inline ~Anchor();
T &get() { return hold; }
const T &get() const { return hold; }
void set(const T &t) { hold = t; }
void clear() { hold = 0; }
private:
T hold;
/* Anchors should not be assigned or passed to functions. */
Anchor(const Anchor &);
const Anchor &operator=(const Anchor &);
};
#ifdef __GNUC__
template<typename T>
inline Anchor<T>::~Anchor() {
/*
* No code is generated for this. But because this is marked 'volatile', G++ will
* assume it has important side-effects, and won't delete it. (G++ never looks at
* the actual text and notices it's empty.) And because we have passed |hold| to
* it, GCC will keep |hold| alive until this point.
*
* The "memory" clobber operand ensures that G++ will not move prior memory
* accesses after the asm --- it's a barrier. Unfortunately, it also means that
* G++ will assume that all memory has changed after the asm, as it would for a
* call to an unknown function. I don't know of a way to avoid that consequence.
*/
asm volatile("":: "g" (hold) : "memory");
}
#else
template<typename T>
inline Anchor<T>::~Anchor() {
/*
* An adequate portable substitute, for non-structure types.
*
* The compiler promises that, by the end of an expression statement, the
* last-stored value to a volatile object is the same as it would be in an
* unoptimized, direct implementation (the "abstract machine" whose behavior the
* language spec describes). However, the compiler is still free to reorder
* non-volatile accesses across this store --- which is what we must prevent. So
* assigning the held value to a volatile variable, as we do here, is not enough.
*
* In our case, however, garbage collection only occurs at function calls, so it
* is sufficient to ensure that the destructor's store isn't moved earlier across
* any function calls that could collect. It is hard to imagine the compiler
* analyzing the program so thoroughly that it could prove that such motion was
* safe. In practice, compilers treat calls to the collector as opaque operations
* --- in particular, as operations which could access volatile variables, across
* which this destructor must not be moved.
*
* ("Objection, your honor! *Alleged* killer whale!")
*
* The disadvantage of this approach is that it does generate code for the store.
* We do need to use Anchors in some cases where cycles are tight.
*/
volatile T sink;
sink = hold;
}
#ifdef JS_USE_JSVAL_JSID_STRUCT_TYPES
/*
* The default assignment operator for |struct C| has the signature:
*
* C& C::operator=(const C&)
*
* And in particular requires implicit conversion of |this| to type |C| for the return
* value. But |volatile C| cannot thus be converted to |C|, so just doing |sink = hold| as
* in the non-specialized version would fail to compile. Do the assignment on asBits
* instead, since I don't think we want to give jsval_layout an assignment operator
* returning |volatile jsval_layout|.
*/
template<>
inline Anchor<jsval>::~Anchor() {
volatile jsval sink;
sink.asBits = hold.asBits;
}
#endif
#endif
} /* namespace JS */
JS_BEGIN_EXTERN_C
#endif
/*
* C-compatible version of the Anchor class. It should be called after the last
* use of the variable it protects.
*/
extern JS_NEVER_INLINE JS_PUBLIC_API(void)
JS_AnchorPtr(void *p);
/*
* This symbol may be used by embedders to detect the change from the old
* JS_AddRoot(JSContext *, void *) APIs to the new ones above.
*/
#define JS_TYPED_ROOTING_API
/* Obsolete rooting APIs. */
#define JS_EnterLocalRootScope(cx) (JS_TRUE)
#define JS_LeaveLocalRootScope(cx) ((void) 0)
#define JS_LeaveLocalRootScopeWithResult(cx, rval) ((void) 0)
#define JS_ForgetLocalRoot(cx, thing) ((void) 0)
typedef enum JSGCRootType {
JS_GC_ROOT_VALUE_PTR,
JS_GC_ROOT_GCTHING_PTR
} JSGCRootType;
#ifdef DEBUG
extern JS_PUBLIC_API(void)
JS_DumpNamedRoots(JSRuntime *rt,
void (*dump)(const char *name, void *rp, JSGCRootType type, void *data),
void *data);
#endif
/*
* Call JS_MapGCRoots to map the GC's roots table using map(rp, name, data).
* The root is pointed at by rp; if the root is unnamed, name is null; data is
* supplied from the third parameter to JS_MapGCRoots.
*
* The map function should return JS_MAP_GCROOT_REMOVE to cause the currently
* enumerated root to be removed. To stop enumeration, set JS_MAP_GCROOT_STOP
* in the return value. To keep on mapping, return JS_MAP_GCROOT_NEXT. These
* constants are flags; you can OR them together.
*
* This function acquires and releases rt's GC lock around the mapping of the
* roots table, so the map function should run to completion in as few cycles
* as possible. Of course, map cannot call JS_GC, JS_MaybeGC, JS_BeginRequest,
* or any JS API entry point that acquires locks, without double-tripping or
* deadlocking on the GC lock.
*
* The JSGCRootType parameter indicates whether rp is a pointer to a Value
* (which is obtained by '(Value *)rp') or a pointer to a GC-thing pointer
* (which is obtained by '(void **)rp').
*
* JS_MapGCRoots returns the count of roots that were successfully mapped.
*/
#define JS_MAP_GCROOT_NEXT 0 /* continue mapping entries */
#define JS_MAP_GCROOT_STOP 1 /* stop mapping entries */
#define JS_MAP_GCROOT_REMOVE 2 /* remove and free the current entry */
typedef intN
(* JSGCRootMapFun)(void *rp, JSGCRootType type, const char *name, void *data);
extern JS_PUBLIC_API(uint32)
JS_MapGCRoots(JSRuntime *rt, JSGCRootMapFun map, void *data);
extern JS_PUBLIC_API(JSBool)
JS_LockGCThing(JSContext *cx, void *thing);
extern JS_PUBLIC_API(JSBool)
JS_LockGCThingRT(JSRuntime *rt, void *thing);
extern JS_PUBLIC_API(JSBool)
JS_UnlockGCThing(JSContext *cx, void *thing);
extern JS_PUBLIC_API(JSBool)
JS_UnlockGCThingRT(JSRuntime *rt, void *thing);
/*
* 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(void)
JS_SetExtraGCRoots(JSRuntime *rt, JSTraceDataOp traceOp, void *data);
/*
* JS_CallTracer API and related macros for implementors of JSTraceOp, to
* enumerate all references to traceable things reachable via a property or
* other strong ref identified for debugging purposes by name or index or
* a naming callback.
*
* See the JSTraceOp typedef in jspubtd.h.
*/
typedef enum {
JSTRACE_OBJECT,
JSTRACE_STRING,
JSTRACE_SCRIPT,
/*
* Trace kinds internal to the engine. The embedding can only them if it
* implements JSTraceCallback.
*/
#if JS_HAS_XML_SUPPORT
JSTRACE_XML,
#endif
JSTRACE_SHAPE,
JSTRACE_TYPE_OBJECT,
JSTRACE_LAST = JSTRACE_TYPE_OBJECT
} JSGCTraceKind;
/*
* Use the following macros to check if a particular jsval is a traceable
* thing and to extract the thing and its kind to pass to JS_CallTracer.
*/
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_TRACEABLE(jsval v)
{
jsval_layout l;
l.asBits = JSVAL_BITS(v);
return JSVAL_IS_TRACEABLE_IMPL(l);
}
static JS_ALWAYS_INLINE void *
JSVAL_TO_TRACEABLE(jsval v)
{
return JSVAL_TO_GCTHING(v);
}
static JS_ALWAYS_INLINE JSGCTraceKind
JSVAL_TRACE_KIND(jsval v)
{
jsval_layout l;
JS_ASSERT(JSVAL_IS_GCTHING(v));
l.asBits = JSVAL_BITS(v);
return (JSGCTraceKind) JSVAL_TRACE_KIND_IMPL(l);
}
/*
* Tracer callback, called for each traceable thing directly referenced by a
* particular object or runtime structure. It is the callback responsibility
* to ensure the traversal of the full object graph via calling eventually
* JS_TraceChildren on the passed thing. In this case the callback must be
* prepared to deal with cycles in the traversal graph.
*
* kind argument is one of JSTRACE_OBJECT, JSTRACE_STRING or a tag denoting
* internal implementation-specific traversal kind. In the latter case the only
* operations on thing that the callback can do is to call JS_TraceChildren or
* DEBUG-only JS_PrintTraceThingInfo.
*/
typedef void
(* JSTraceCallback)(JSTracer *trc, void *thing, JSGCTraceKind kind);
struct JSTracer {
JSContext *context;
JSTraceCallback callback;
JSTraceNamePrinter debugPrinter;
const void *debugPrintArg;
size_t debugPrintIndex;
};
/*
* The method to call on each reference to a traceable thing stored in a
* particular JSObject or other runtime structure. With DEBUG defined the
* caller before calling JS_CallTracer must initialize JSTracer fields
* describing the reference using the macros below.
*/
extern JS_PUBLIC_API(void)
JS_CallTracer(JSTracer *trc, void *thing, JSGCTraceKind kind);
/*
* Set debugging information about a reference to a traceable thing to prepare
* for the following call to JS_CallTracer.
*
* When printer is null, arg must be const char * or char * C string naming
* the reference and index must be either (size_t)-1 indicating that the name
* alone describes the reference or it must be an index into some array vector
* that stores the reference.
*
* When printer callback is not null, the arg and index arguments are
* available to the callback as debugPrintArg and debugPrintIndex fields
* of JSTracer.
*
* The storage for name or callback's arguments needs to live only until
* the following call to JS_CallTracer returns.
*/
#ifdef DEBUG
# define JS_SET_TRACING_DETAILS(trc, printer, arg, index) \
JS_BEGIN_MACRO \
(trc)->debugPrinter = (printer); \
(trc)->debugPrintArg = (arg); \
(trc)->debugPrintIndex = (index); \
JS_END_MACRO
#else
# define JS_SET_TRACING_DETAILS(trc, printer, arg, index) \
JS_BEGIN_MACRO \
JS_END_MACRO
#endif
/*
* Convenience macro to describe the argument of JS_CallTracer using C string
* and index.
*/
# define JS_SET_TRACING_INDEX(trc, name, index) \
JS_SET_TRACING_DETAILS(trc, NULL, name, index)
/*
* Convenience macro to describe the argument of JS_CallTracer using C string.
*/
# define JS_SET_TRACING_NAME(trc, name) \
JS_SET_TRACING_DETAILS(trc, NULL, name, (size_t)-1)
/*
* Convenience macro to invoke JS_CallTracer using C string as the name for
* the reference to a traceable thing.
*/
# define JS_CALL_TRACER(trc, thing, kind, name) \
JS_BEGIN_MACRO \
JS_SET_TRACING_NAME(trc, name); \
JS_CallTracer((trc), (thing), (kind)); \
JS_END_MACRO
/*
* Convenience macros to invoke JS_CallTracer when jsval represents a
* reference to a traceable thing.
*/
#define JS_CALL_VALUE_TRACER(trc, val, name) \
JS_BEGIN_MACRO \
if (JSVAL_IS_TRACEABLE(val)) { \
JS_CALL_TRACER((trc), JSVAL_TO_GCTHING(val), \
JSVAL_TRACE_KIND(val), name); \
} \
JS_END_MACRO
#define JS_CALL_OBJECT_TRACER(trc, object, name) \
JS_BEGIN_MACRO \
JSObject *obj_ = (object); \
JS_ASSERT(obj_); \
JS_CALL_TRACER((trc), obj_, JSTRACE_OBJECT, name); \
JS_END_MACRO
#define JS_CALL_STRING_TRACER(trc, string, name) \
JS_BEGIN_MACRO \
JSString *str_ = (string); \
JS_ASSERT(str_); \
JS_CALL_TRACER((trc), str_, JSTRACE_STRING, name); \
JS_END_MACRO
/*
* API for JSTraceCallback implementations.
*/
# define JS_TRACER_INIT(trc, cx_, callback_) \
JS_BEGIN_MACRO \
(trc)->context = (cx_); \
(trc)->callback = (callback_); \
(trc)->debugPrinter = NULL; \
(trc)->debugPrintArg = NULL; \
(trc)->debugPrintIndex = (size_t)-1; \
JS_END_MACRO
extern JS_PUBLIC_API(void)
JS_TraceChildren(JSTracer *trc, void *thing, JSGCTraceKind kind);
extern JS_PUBLIC_API(void)
JS_TraceRuntime(JSTracer *trc);
#ifdef DEBUG
extern JS_PUBLIC_API(void)
JS_PrintTraceThingInfo(char *buf, size_t bufsize, JSTracer *trc,
void *thing, JSGCTraceKind kind, JSBool includeDetails);
/*
* 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(JSBool)
JS_DumpHeap(JSContext *cx, FILE *fp, void* startThing, JSGCTraceKind kind,
void *thingToFind, size_t maxDepth, void *thingToIgnore);
#endif
/*
* Garbage collector API.
*/
extern JS_PUBLIC_API(void)
JS_GC(JSContext *cx);
extern JS_PUBLIC_API(void)
JS_CompartmentGC(JSContext *cx, JSCompartment *comp);
extern JS_PUBLIC_API(void)
JS_MaybeGC(JSContext *cx);
extern JS_PUBLIC_API(JSGCCallback)
JS_SetGCCallback(JSContext *cx, JSGCCallback cb);
extern JS_PUBLIC_API(JSGCCallback)
JS_SetGCCallbackRT(JSRuntime *rt, JSGCCallback cb);
extern JS_PUBLIC_API(JSBool)
JS_IsGCMarkingTracer(JSTracer *trc);
extern JS_PUBLIC_API(JSBool)
JS_IsAboutToBeFinalized(JSContext *cx, void *thing);
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,
/* Hoard stackPools for this long, in ms, default is 30 seconds. */
JSGC_STACKPOOL_LIFESPAN = 2,
/* 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 GC chunks waiting to expire. */
JSGC_UNUSED_CHUNKS = 7,
/* Total number of allocated GC chunks. */
JSGC_TOTAL_CHUNKS = 8
} JSGCParamKey;
typedef enum JSGCMode {
/* Perform only global GCs. */
JSGC_MODE_GLOBAL = 0,
/* Perform per-compartment GCs until too much garbage has accumulated. */
JSGC_MODE_COMPARTMENT = 1
} JSGCMode;
extern JS_PUBLIC_API(void)
JS_SetGCParameter(JSRuntime *rt, JSGCParamKey key, uint32 value);
extern JS_PUBLIC_API(uint32)
JS_GetGCParameter(JSRuntime *rt, JSGCParamKey key);
extern JS_PUBLIC_API(void)
JS_SetGCParameterForThread(JSContext *cx, JSGCParamKey key, uint32 value);
extern JS_PUBLIC_API(uint32)
JS_GetGCParameterForThread(JSContext *cx, JSGCParamKey key);
/*
* Flush the code cache for the current thread. The operation might be
* delayed if the cache cannot be flushed currently because native
* code is currently executing.
*/
extern JS_PUBLIC_API(void)
JS_FlushCaches(JSContext *cx);
/*
* Add a finalizer for external strings created by JS_NewExternalString (see
* below) using a type-code returned from this function, and that understands
* how to free or release the memory pointed at by JS_GetStringChars(str).
*
* Return a nonnegative type index if there is room for finalizer in the
* global GC finalizers table, else return -1. If the engine is compiled
* JS_THREADSAFE and used in a multi-threaded environment, this function must
* be invoked on the primordial thread only, at startup -- or else the entire
* program must single-thread itself while loading a module that calls this
* function.
*/
extern JS_PUBLIC_API(intN)
JS_AddExternalStringFinalizer(JSStringFinalizeOp finalizer);
/*
* Remove finalizer from the global GC finalizers table, returning its type
* code if found, -1 if not found.
*
* As with JS_AddExternalStringFinalizer, there is a threading restriction
* if you compile the engine JS_THREADSAFE: this function may be called for a
* given finalizer pointer on only one thread; different threads may call to
* remove distinct finalizers safely.
*
* You must ensure that all strings with finalizer's type have been collected
* before calling this function. Otherwise, string data will be leaked by the
* GC, for want of a finalizer to call.
*/
extern JS_PUBLIC_API(intN)
JS_RemoveExternalStringFinalizer(JSStringFinalizeOp finalizer);
/*
* Create a new JSString whose chars member refers to external memory, i.e.,
* memory requiring type-specific finalization. The type code must be a
* nonnegative return value from JS_AddExternalStringFinalizer.
*/
extern JS_PUBLIC_API(JSString *)
JS_NewExternalString(JSContext *cx, const jschar *chars, size_t length, intN type);
/*
* Like JS_NewExternalString, except that 'closure' can be retrieved later via
* JS_GetExternalStringClosure. This closure data is a black blox to the JS
* engine and may be used by the embedding to associate extra data with an
* external string. E.g., an embedding may want to associate a pointer to the
* object that owns the chars of an external string so that, when this external
* string is finalized, the owner object can be deleted.
*/
extern JS_PUBLIC_API(JSString *)
JS_NewExternalStringWithClosure(JSContext *cx, const jschar *chars, size_t length,
intN type, void *closure);
/*
* Return whether 'str' was created with JS_NewExternalString or
* JS_NewExternalStringWithClosure.
*/
extern JS_PUBLIC_API(JSBool)
JS_IsExternalString(JSContext *cx, JSString *str);
/*
* Return the 'closure' arg passed to JS_NewExternalStringWithClosure or NULL
* if the external string was created via JS_NewExternalString.
*/
extern JS_PUBLIC_API(void *)
JS_GetExternalStringClosure(JSContext *cx, JSString *str);
/*
* Deprecated. Use JS_SetNativeStackQuoata instead.
*/
extern JS_PUBLIC_API(void)
JS_SetThreadStackLimit(JSContext *cx, jsuword limitAddr);
/*
* Set the size of the native stack that should not be exceed. To disable
* stack size checking pass 0.
*/
extern JS_PUBLIC_API(void)
JS_SetNativeStackQuota(JSContext *cx, size_t stackSize);
/************************************************************************/
/*
* Classes, objects, and properties.
*/
typedef void (*JSClassInternal)();
/* For detailed comments on the function pointer types, see jspubtd.h. */
struct JSClass {
const char *name;
uint32 flags;
/* Mandatory non-null function pointer members. */
JSPropertyOp addProperty;
JSPropertyOp delProperty;
JSPropertyOp getProperty;
JSStrictPropertyOp setProperty;
JSEnumerateOp enumerate;
JSResolveOp resolve;
JSConvertOp convert;
JSFinalizeOp finalize;
/* Optionally non-null members start here. */
JSClassInternal reserved0;
JSCheckAccessOp checkAccess;
JSNative call;
JSNative construct;
JSXDRObjectOp xdrObject;
JSHasInstanceOp hasInstance;
JSTraceOp trace;
JSClassInternal reserved1;
void *reserved[26];
};
#define JSCLASS_HAS_PRIVATE (1<<0) /* objects have private slot */
#define JSCLASS_NEW_ENUMERATE (1<<1) /* has JSNewEnumerateOp hook */
#define JSCLASS_NEW_RESOLVE (1<<2) /* has JSNewResolveOp hook */
#define JSCLASS_PRIVATE_IS_NSISUPPORTS (1<<3) /* private is (nsISupports *) */
#define JSCLASS_CONCURRENT_FINALIZER (1<<4) /* finalize is called on background thread */
#define JSCLASS_NEW_RESOLVE_GETS_START (1<<5) /* JSNewResolveOp gets starting
object in prototype chain
passed in via *objp in/out
parameter */
#define JSCLASS_CONSTRUCT_PROTOTYPE (1<<6) /* call constructor on class
prototype */
#define JSCLASS_DOCUMENT_OBSERVER (1<<7) /* DOM document observer */
/*
* To reserve slots fetched and stored via JS_Get/SetReservedSlot, bitwise-or
* JSCLASS_HAS_RESERVED_SLOTS(n) into the initializer for JSClass.flags, where
* n is a constant in [1, 255]. Reserved slots are indexed from 0 to n-1.
*/
#define JSCLASS_RESERVED_SLOTS_SHIFT 8 /* room for 8 flags below */
#define JSCLASS_RESERVED_SLOTS_WIDTH 8 /* and 16 above this field */
#define JSCLASS_RESERVED_SLOTS_MASK JS_BITMASK(JSCLASS_RESERVED_SLOTS_WIDTH)
#define JSCLASS_HAS_RESERVED_SLOTS(n) (((n) & JSCLASS_RESERVED_SLOTS_MASK) \
<< JSCLASS_RESERVED_SLOTS_SHIFT)
#define JSCLASS_RESERVED_SLOTS(clasp) (((clasp)->flags \
>> JSCLASS_RESERVED_SLOTS_SHIFT) \
& JSCLASS_RESERVED_SLOTS_MASK)
#define JSCLASS_HIGH_FLAGS_SHIFT (JSCLASS_RESERVED_SLOTS_SHIFT + \
JSCLASS_RESERVED_SLOTS_WIDTH)
#define JSCLASS_INTERNAL_FLAG1 (1<<(JSCLASS_HIGH_FLAGS_SHIFT+0))
#define JSCLASS_IS_ANONYMOUS (1<<(JSCLASS_HIGH_FLAGS_SHIFT+1))
#define JSCLASS_IS_GLOBAL (1<<(JSCLASS_HIGH_FLAGS_SHIFT+2))
#define JSCLASS_INTERNAL_FLAG2 (1<<(JSCLASS_HIGH_FLAGS_SHIFT+3))
#define JSCLASS_INTERNAL_FLAG3 (1<<(JSCLASS_HIGH_FLAGS_SHIFT+4))
/* Indicate whether the proto or ctor should be frozen. */
#define JSCLASS_FREEZE_PROTO (1<<(JSCLASS_HIGH_FLAGS_SHIFT+5))
#define JSCLASS_FREEZE_CTOR (1<<(JSCLASS_HIGH_FLAGS_SHIFT+6))
/* Global flags. */
#define JSGLOBAL_FLAGS_CLEARED 0x1
/*
* ECMA-262 requires that most constructors used internally create objects
* with "the original Foo.prototype value" as their [[Prototype]] (__proto__)
* member initial value. The "original ... value" verbiage is there because
* in ECMA-262, global properties naming class objects are read/write and
* deleteable, for the most part.
*
* Implementing this efficiently requires that global objects have classes
* with the following flags. Failure to use JSCLASS_GLOBAL_FLAGS was
* prevously allowed, but is now an ES5 violation and thus unsupported.
*/
#define JSCLASS_GLOBAL_SLOT_COUNT (JSProto_LIMIT * 3 + 8)
#define JSCLASS_GLOBAL_FLAGS \
(JSCLASS_IS_GLOBAL | JSCLASS_HAS_RESERVED_SLOTS(JSCLASS_GLOBAL_SLOT_COUNT))
/* Fast access to the original value of each standard class's prototype. */
#define JSCLASS_CACHED_PROTO_SHIFT (JSCLASS_HIGH_FLAGS_SHIFT + 8)
#define JSCLASS_CACHED_PROTO_WIDTH 8
#define JSCLASS_CACHED_PROTO_MASK JS_BITMASK(JSCLASS_CACHED_PROTO_WIDTH)
#define JSCLASS_HAS_CACHED_PROTO(key) ((key) << JSCLASS_CACHED_PROTO_SHIFT)
#define JSCLASS_CACHED_PROTO_KEY(clasp) ((JSProtoKey) \
(((clasp)->flags \
>> JSCLASS_CACHED_PROTO_SHIFT) \
& JSCLASS_CACHED_PROTO_MASK))
/* Initializer for unused members of statically initialized JSClass structs. */
#define JSCLASS_NO_INTERNAL_MEMBERS 0,{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
#define JSCLASS_NO_OPTIONAL_MEMBERS 0,0,0,0,0,0,0,JSCLASS_NO_INTERNAL_MEMBERS
struct JSIdArray {
jsint length;
jsid vector[1]; /* actually, length jsid words */
};
extern JS_PUBLIC_API(void)
JS_DestroyIdArray(JSContext *cx, JSIdArray *ida);
extern JS_PUBLIC_API(JSBool)
JS_ValueToId(JSContext *cx, jsval v, jsid *idp);
extern JS_PUBLIC_API(JSBool)
JS_IdToValue(JSContext *cx, jsid id, jsval *vp);
/*
* JSNewResolveOp flag bits.
*/
#define JSRESOLVE_QUALIFIED 0x01 /* resolve a qualified property id */
#define JSRESOLVE_ASSIGNING 0x02 /* resolve on the left of assignment */
#define JSRESOLVE_DETECTING 0x04 /* 'if (o.p)...' or '(o.p) ?...:...' */
#define JSRESOLVE_DECLARING 0x08 /* var, const, or function prolog op */
#define JSRESOLVE_CLASSNAME 0x10 /* class name used when constructing */
#define JSRESOLVE_WITH 0x20 /* resolve inside a with statement */
extern JS_PUBLIC_API(JSBool)
JS_PropertyStub(JSContext *cx, JSObject *obj, jsid id, jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_StrictPropertyStub(JSContext *cx, JSObject *obj, jsid id, JSBool strict, jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_EnumerateStub(JSContext *cx, JSObject *obj);
extern JS_PUBLIC_API(JSBool)
JS_ResolveStub(JSContext *cx, JSObject *obj, jsid id);
extern JS_PUBLIC_API(JSBool)
JS_ConvertStub(JSContext *cx, JSObject *obj, JSType type, jsval *vp);
extern JS_PUBLIC_API(void)
JS_FinalizeStub(JSContext *cx, JSObject *obj);
struct JSConstDoubleSpec {
jsdouble dval;
const char *name;
uint8 flags;
uint8 spare[3];
};
/*
* 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 {
const char *name;
int8 tinyid;
uint8 flags;
JSPropertyOp getter;
JSStrictPropertyOp setter;
};
struct JSFunctionSpec {
const char *name;
JSNative call;
uint16 nargs;
uint16 flags;
};
/*
* 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(NULL,NULL,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.
*/
#define JS_FS(name,call,nargs,flags) \
{name, call, nargs, flags}
#define JS_FN(name,call,nargs,flags) \
{name, call, nargs, (flags) | JSFUN_STUB_GSOPS}
extern JS_PUBLIC_API(JSObject *)
JS_InitClass(JSContext *cx, JSObject *obj, JSObject *parent_proto,
JSClass *clasp, JSNative constructor, uintN nargs,
JSPropertySpec *ps, JSFunctionSpec *fs,
JSPropertySpec *static_ps, JSFunctionSpec *static_fs);
#ifdef JS_THREADSAFE
extern JS_PUBLIC_API(JSClass *)
JS_GetClass(JSContext *cx, JSObject *obj);
#define JS_GET_CLASS(cx,obj) JS_GetClass(cx, obj)
#else
extern JS_PUBLIC_API(JSClass *)
JS_GetClass(JSObject *obj);
#define JS_GET_CLASS(cx,obj) JS_GetClass(obj)
#endif
extern JS_PUBLIC_API(JSBool)
JS_InstanceOf(JSContext *cx, JSObject *obj, JSClass *clasp, jsval *argv);
extern JS_PUBLIC_API(JSBool)
JS_HasInstance(JSContext *cx, JSObject *obj, jsval v, JSBool *bp);
extern JS_PUBLIC_API(void *)
JS_GetPrivate(JSContext *cx, JSObject *obj);
extern JS_PUBLIC_API(JSBool)
JS_SetPrivate(JSContext *cx, JSObject *obj, void *data);
extern JS_PUBLIC_API(void *)
JS_GetInstancePrivate(JSContext *cx, JSObject *obj, JSClass *clasp,
jsval *argv);
extern JS_PUBLIC_API(JSObject *)
JS_GetPrototype(JSContext *cx, JSObject *obj);
extern JS_PUBLIC_API(JSBool)
JS_SetPrototype(JSContext *cx, JSObject *obj, JSObject *proto);
extern JS_PUBLIC_API(JSObject *)
JS_GetParent(JSContext *cx, JSObject *obj);
extern JS_PUBLIC_API(JSBool)
JS_SetParent(JSContext *cx, JSObject *obj, JSObject *parent);
extern JS_PUBLIC_API(JSObject *)
JS_GetConstructor(JSContext *cx, JSObject *proto);
/*
* Get a unique identifier for obj, good for the lifetime of obj (even if it
* is moved by a copying GC). Return false on failure (likely out of memory),
* and true with *idp containing the unique id on success.
*/
extern JS_PUBLIC_API(JSBool)
JS_GetObjectId(JSContext *cx, JSObject *obj, jsid *idp);
extern JS_PUBLIC_API(JSObject *)
JS_NewGlobalObject(JSContext *cx, JSClass *clasp);
extern JS_PUBLIC_API(JSObject *)
JS_NewCompartmentAndGlobalObject(JSContext *cx, JSClass *clasp, JSPrincipals *principals);
extern JS_PUBLIC_API(JSObject *)
JS_NewObject(JSContext *cx, JSClass *clasp, JSObject *proto, JSObject *parent);
/* Queries the [[Extensible]] property of the object. */
extern JS_PUBLIC_API(JSBool)
JS_IsExtensible(JSObject *obj);
extern JS_PUBLIC_API(JSBool)
JS_IsNative(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, JSClass *clasp, JSObject *proto,
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(JSBool)
JS_DeepFreezeObject(JSContext *cx, JSObject *obj);
/*
* Freezes an object; see ES5's Object.freeze(obj) method.
*/
extern JS_PUBLIC_API(JSBool)
JS_FreezeObject(JSContext *cx, JSObject *obj);
extern JS_PUBLIC_API(JSObject *)
JS_ConstructObject(JSContext *cx, JSClass *clasp, JSObject *proto,
JSObject *parent);
extern JS_PUBLIC_API(JSObject *)
JS_ConstructObjectWithArguments(JSContext *cx, JSClass *clasp, JSObject *proto,
JSObject *parent, uintN argc, jsval *argv);
extern JS_PUBLIC_API(JSObject *)
JS_New(JSContext *cx, JSObject *ctor, uintN argc, jsval *argv);
extern JS_PUBLIC_API(JSObject *)
JS_DefineObject(JSContext *cx, JSObject *obj, const char *name, JSClass *clasp,
JSObject *proto, uintN attrs);
extern JS_PUBLIC_API(JSBool)
JS_DefineConstDoubles(JSContext *cx, JSObject *obj, JSConstDoubleSpec *cds);
extern JS_PUBLIC_API(JSBool)
JS_DefineProperties(JSContext *cx, JSObject *obj, JSPropertySpec *ps);
extern JS_PUBLIC_API(JSBool)
JS_DefineProperty(JSContext *cx, JSObject *obj, const char *name, jsval value,
JSPropertyOp getter, JSStrictPropertyOp setter, uintN attrs);
extern JS_PUBLIC_API(JSBool)
JS_DefinePropertyById(JSContext *cx, JSObject *obj, jsid id, jsval value,
JSPropertyOp getter, JSStrictPropertyOp setter, uintN attrs);
extern JS_PUBLIC_API(JSBool)
JS_DefineOwnProperty(JSContext *cx, JSObject *obj, jsid id, jsval descriptor, JSBool *bp);
/*
* Determine the attributes (JSPROP_* flags) of a property on a given object.
*
* If the object does not have a property by that name, *foundp will be
* JS_FALSE and the value of *attrsp is undefined.
*/
extern JS_PUBLIC_API(JSBool)
JS_GetPropertyAttributes(JSContext *cx, JSObject *obj, const char *name,
uintN *attrsp, JSBool *foundp);
/*
* The same, but if the property is native, return its getter and setter via
* *getterp and *setterp, respectively (and only if the out parameter pointer
* is not null).
*/
extern JS_PUBLIC_API(JSBool)
JS_GetPropertyAttrsGetterAndSetter(JSContext *cx, JSObject *obj,
const char *name,
uintN *attrsp, JSBool *foundp,
JSPropertyOp *getterp,
JSStrictPropertyOp *setterp);
extern JS_PUBLIC_API(JSBool)
JS_GetPropertyAttrsGetterAndSetterById(JSContext *cx, JSObject *obj,
jsid id,
uintN *attrsp, JSBool *foundp,
JSPropertyOp *getterp,
JSStrictPropertyOp *setterp);
/*
* Set the attributes of a property on a given object.
*
* If the object does not have a property by that name, *foundp will be
* JS_FALSE and nothing will be altered.
*/
extern JS_PUBLIC_API(JSBool)
JS_SetPropertyAttributes(JSContext *cx, JSObject *obj, const char *name,
uintN attrs, JSBool *foundp);
extern JS_PUBLIC_API(JSBool)
JS_DefinePropertyWithTinyId(JSContext *cx, JSObject *obj, const char *name,
int8 tinyid, jsval value,
JSPropertyOp getter, JSStrictPropertyOp setter,
uintN attrs);
extern JS_PUBLIC_API(JSBool)
JS_AlreadyHasOwnProperty(JSContext *cx, JSObject *obj, const char *name,
JSBool *foundp);
extern JS_PUBLIC_API(JSBool)
JS_AlreadyHasOwnPropertyById(JSContext *cx, JSObject *obj, jsid id,
JSBool *foundp);
extern JS_PUBLIC_API(JSBool)
JS_HasProperty(JSContext *cx, JSObject *obj, const char *name, JSBool *foundp);
extern JS_PUBLIC_API(JSBool)
JS_HasPropertyById(JSContext *cx, JSObject *obj, jsid id, JSBool *foundp);
extern JS_PUBLIC_API(JSBool)
JS_LookupProperty(JSContext *cx, JSObject *obj, const char *name, jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_LookupPropertyById(JSContext *cx, JSObject *obj, jsid id, jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_LookupPropertyWithFlags(JSContext *cx, JSObject *obj, const char *name,
uintN flags, jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_LookupPropertyWithFlagsById(JSContext *cx, JSObject *obj, jsid id,
uintN flags, JSObject **objp, jsval *vp);
struct JSPropertyDescriptor {
JSObject *obj;
uintN attrs;
JSPropertyOp getter;
JSStrictPropertyOp setter;
jsval value;
uintN shortid;
};
/*
* Like JS_GetPropertyAttrsGetterAndSetterById but will return a property on
* an object on the prototype chain (returned in objp). If data->obj is null,
* then this property was not found on the prototype chain.
*/
extern JS_PUBLIC_API(JSBool)
JS_GetPropertyDescriptorById(JSContext *cx, JSObject *obj, jsid id, uintN flags,
JSPropertyDescriptor *desc);
extern JS_PUBLIC_API(JSBool)
JS_GetOwnPropertyDescriptor(JSContext *cx, JSObject *obj, jsid id, jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_GetProperty(JSContext *cx, JSObject *obj, const char *name, jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_GetPropertyDefault(JSContext *cx, JSObject *obj, const char *name, jsval def, jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_GetPropertyById(JSContext *cx, JSObject *obj, jsid id, jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_GetPropertyByIdDefault(JSContext *cx, JSObject *obj, jsid id, jsval def, jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_GetMethodById(JSContext *cx, JSObject *obj, jsid id, JSObject **objp,
jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_GetMethod(JSContext *cx, JSObject *obj, const char *name, JSObject **objp,
jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_SetProperty(JSContext *cx, JSObject *obj, const char *name, jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_SetPropertyById(JSContext *cx, JSObject *obj, jsid id, jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_DeleteProperty(JSContext *cx, JSObject *obj, const char *name);
extern JS_PUBLIC_API(JSBool)
JS_DeleteProperty2(JSContext *cx, JSObject *obj, const char *name,
jsval *rval);
extern JS_PUBLIC_API(JSBool)
JS_DeletePropertyById(JSContext *cx, JSObject *obj, jsid id);
extern JS_PUBLIC_API(JSBool)
JS_DeletePropertyById2(JSContext *cx, JSObject *obj, jsid id, jsval *rval);
extern JS_PUBLIC_API(JSBool)
JS_DefineUCProperty(JSContext *cx, JSObject *obj,
const jschar *name, size_t namelen, jsval value,
JSPropertyOp getter, JSStrictPropertyOp setter,
uintN attrs);
/*
* Determine the attributes (JSPROP_* flags) of a property on a given object.
*
* If the object does not have a property by that name, *foundp will be
* JS_FALSE and the value of *attrsp is undefined.
*/
extern JS_PUBLIC_API(JSBool)
JS_GetUCPropertyAttributes(JSContext *cx, JSObject *obj,
const jschar *name, size_t namelen,
uintN *attrsp, JSBool *foundp);
/*
* The same, but if the property is native, return its getter and setter via
* *getterp and *setterp, respectively (and only if the out parameter pointer
* is not null).
*/
extern JS_PUBLIC_API(JSBool)
JS_GetUCPropertyAttrsGetterAndSetter(JSContext *cx, JSObject *obj,
const jschar *name, size_t namelen,
uintN *attrsp, JSBool *foundp,
JSPropertyOp *getterp,
JSStrictPropertyOp *setterp);
/*
* Set the attributes of a property on a given object.
*
* If the object does not have a property by that name, *foundp will be
* JS_FALSE and nothing will be altered.
*/
extern JS_PUBLIC_API(JSBool)
JS_SetUCPropertyAttributes(JSContext *cx, JSObject *obj,
const jschar *name, size_t namelen,
uintN attrs, JSBool *foundp);
extern JS_PUBLIC_API(JSBool)
JS_DefineUCPropertyWithTinyId(JSContext *cx, JSObject *obj,
const jschar *name, size_t namelen,
int8 tinyid, jsval value,
JSPropertyOp getter, JSStrictPropertyOp setter,
uintN attrs);
extern JS_PUBLIC_API(JSBool)
JS_AlreadyHasOwnUCProperty(JSContext *cx, JSObject *obj, const jschar *name,
size_t namelen, JSBool *foundp);
extern JS_PUBLIC_API(JSBool)
JS_HasUCProperty(JSContext *cx, JSObject *obj,
const jschar *name, size_t namelen,
JSBool *vp);
extern JS_PUBLIC_API(JSBool)
JS_LookupUCProperty(JSContext *cx, JSObject *obj,
const jschar *name, size_t namelen,
jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_GetUCProperty(JSContext *cx, JSObject *obj,
const jschar *name, size_t namelen,
jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_SetUCProperty(JSContext *cx, JSObject *obj,
const jschar *name, size_t namelen,
jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_DeleteUCProperty2(JSContext *cx, JSObject *obj,
const jschar *name, size_t namelen,
jsval *rval);
extern JS_PUBLIC_API(JSObject *)
JS_NewArrayObject(JSContext *cx, jsint length, jsval *vector);
extern JS_PUBLIC_API(JSBool)
JS_IsArrayObject(JSContext *cx, JSObject *obj);
extern JS_PUBLIC_API(JSBool)
JS_GetArrayLength(JSContext *cx, JSObject *obj, jsuint *lengthp);
extern JS_PUBLIC_API(JSBool)
JS_SetArrayLength(JSContext *cx, JSObject *obj, jsuint length);
extern JS_PUBLIC_API(JSBool)
JS_DefineElement(JSContext *cx, JSObject *obj, uint32 index, jsval value,
JSPropertyOp getter, JSStrictPropertyOp setter, uintN attrs);
extern JS_PUBLIC_API(JSBool)
JS_AlreadyHasOwnElement(JSContext *cx, JSObject *obj, uint32 index, JSBool *foundp);
extern JS_PUBLIC_API(JSBool)
JS_HasElement(JSContext *cx, JSObject *obj, uint32 index, JSBool *foundp);
extern JS_PUBLIC_API(JSBool)
JS_LookupElement(JSContext *cx, JSObject *obj, uint32 index, jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_GetElement(JSContext *cx, JSObject *obj, uint32 index, jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_SetElement(JSContext *cx, JSObject *obj, uint32 index, jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_DeleteElement(JSContext *cx, JSObject *obj, uint32 index);
extern JS_PUBLIC_API(JSBool)
JS_DeleteElement2(JSContext *cx, JSObject *obj, uint32 index, jsval *rval);
extern JS_PUBLIC_API(void)
JS_ClearScope(JSContext *cx, JSObject *obj);
extern JS_PUBLIC_API(JSIdArray *)
JS_Enumerate(JSContext *cx, JSObject *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, 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(JSBool)
JS_NextProperty(JSContext *cx, JSObject *iterobj, jsid *idp);
extern JS_PUBLIC_API(JSBool)
JS_CheckAccess(JSContext *cx, JSObject *obj, jsid id, JSAccessMode mode,
jsval *vp, uintN *attrsp);
extern JS_PUBLIC_API(JSBool)
JS_GetReservedSlot(JSContext *cx, JSObject *obj, uint32 index, jsval *vp);
extern JS_PUBLIC_API(JSBool)
JS_SetReservedSlot(JSContext *cx, JSObject *obj, uint32 index, jsval v);
/************************************************************************/
/*
* Security protocol.
*/
struct JSPrincipals {
char *codebase;
/* XXX unspecified and unused by Mozilla code -- can we remove these? */
void * (* getPrincipalArray)(JSContext *cx, JSPrincipals *);
JSBool (* globalPrivilegesEnabled)(JSContext *cx, JSPrincipals *);
/* Don't call "destroy"; use reference counting macros below. */
jsrefcount refcount;
void (* destroy)(JSContext *cx, JSPrincipals *);
JSBool (* subsume)(JSPrincipals *, JSPrincipals *);
};
#ifdef JS_THREADSAFE
#define JSPRINCIPALS_HOLD(cx, principals) JS_HoldPrincipals(cx,principals)
#define JSPRINCIPALS_DROP(cx, principals) JS_DropPrincipals(cx,principals)
extern JS_PUBLIC_API(jsrefcount)
JS_HoldPrincipals(JSContext *cx, JSPrincipals *principals);
extern JS_PUBLIC_API(jsrefcount)
JS_DropPrincipals(JSContext *cx, JSPrincipals *principals);
#else
#define JSPRINCIPALS_HOLD(cx, principals) (++(principals)->refcount)
#define JSPRINCIPALS_DROP(cx, principals) \
((--(principals)->refcount == 0) \
? ((*(principals)->destroy)((cx), (principals)), 0) \
: (principals)->refcount)
#endif
struct JSSecurityCallbacks {
JSCheckAccessOp checkObjectAccess;
JSPrincipalsTranscoder principalsTranscoder;
JSObjectPrincipalsFinder findObjectPrincipals;
JSCSPEvalChecker contentSecurityPolicyAllows;
};
extern JS_PUBLIC_API(JSSecurityCallbacks *)
JS_SetRuntimeSecurityCallbacks(JSRuntime *rt, JSSecurityCallbacks *callbacks);
extern JS_PUBLIC_API(JSSecurityCallbacks *)
JS_GetRuntimeSecurityCallbacks(JSRuntime *rt);
extern JS_PUBLIC_API(JSSecurityCallbacks *)
JS_SetContextSecurityCallbacks(JSContext *cx, JSSecurityCallbacks *callbacks);
extern JS_PUBLIC_API(JSSecurityCallbacks *)
JS_GetSecurityCallbacks(JSContext *cx);
/*
* Code running with "trusted" principals will be given a deeper stack
* allocation than ordinary scripts. This allows trusted script to run after
* untrusted script has exhausted the stack. This function sets the
* runtime-wide trusted principal.
*
* This principals is not held (via JS_HoldPrincipals/JS_DropPrincipals) since
* there is no available JSContext. Instead, the caller must ensure that the
* given principals stays valid for as long as 'rt' may point to it. If the
* principals would be destroyed before 'rt', JS_SetTrustedPrincipals must be
* called again, passing NULL for 'prin'.
*/
extern JS_PUBLIC_API(void)
JS_SetTrustedPrincipals(JSRuntime *rt, JSPrincipals *prin);
/************************************************************************/
/*
* Functions and scripts.
*/
extern JS_PUBLIC_API(JSFunction *)
JS_NewFunction(JSContext *cx, JSNative call, uintN nargs, uintN flags,
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, uintN nargs, uintN flags,
JSObject *parent, jsid id);
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 JSFUN_* flags for fun.
*/
extern JS_PUBLIC_API(uintN)
JS_GetFunctionFlags(JSFunction *fun);
/*
* Return the arity (length) of fun.
*/
extern JS_PUBLIC_API(uint16)
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(JSBool)
JS_ObjectIsFunction(JSContext *cx, JSObject *obj);
extern JS_PUBLIC_API(JSBool)
JS_ObjectIsCallable(JSContext *cx, JSObject *obj);
extern JS_PUBLIC_API(JSBool)
JS_DefineFunctions(JSContext *cx, JSObject *obj, JSFunctionSpec *fs);
extern JS_PUBLIC_API(JSFunction *)
JS_DefineFunction(JSContext *cx, JSObject *obj, const char *name, JSNative call,
uintN nargs, uintN attrs);
extern JS_PUBLIC_API(JSFunction *)
JS_DefineUCFunction(JSContext *cx, JSObject *obj,
const jschar *name, size_t namelen, JSNative call,
uintN nargs, uintN attrs);
extern JS_PUBLIC_API(JSFunction *)
JS_DefineFunctionById(JSContext *cx, JSObject *obj, jsid id, JSNative call,
uintN nargs, uintN attrs);
extern JS_PUBLIC_API(JSObject *)
JS_CloneFunctionObject(JSContext *cx, JSObject *funobj, JSObject *parent);
/*
* Given a buffer, return JS_FALSE if the buffer might become a valid
* javascript statement with the addition of more lines. Otherwise return
* JS_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(JSBool)
JS_BufferIsCompilableUnit(JSContext *cx, JSBool bytes_are_utf8,
JSObject *obj, const char *bytes, size_t length);
extern JS_PUBLIC_API(JSObject *)
JS_CompileScript(JSContext *cx, JSObject *obj,
const char *bytes, size_t length,
const char *filename, uintN lineno);
extern JS_PUBLIC_API(JSObject *)
JS_CompileScriptForPrincipals(JSContext *cx, JSObject *obj,
JSPrincipals *principals,
const char *bytes, size_t length,
const char *filename, uintN lineno);
extern JS_PUBLIC_API(JSObject *)
JS_CompileScriptForPrincipalsVersion(JSContext *cx, JSObject *obj,
JSPrincipals *principals,
const char *bytes, size_t length,
const char *filename, uintN lineno,
JSVersion version);
extern JS_PUBLIC_API(JSObject *)
JS_CompileUCScript(JSContext *cx, JSObject *obj,
const jschar *chars, size_t length,
const char *filename, uintN lineno);
extern JS_PUBLIC_API(JSObject *)
JS_CompileUCScriptForPrincipals(JSContext *cx, JSObject *obj,
JSPrincipals *principals,
const jschar *chars, size_t length,
const char *filename, uintN lineno);
extern JS_PUBLIC_API(JSObject *)
JS_CompileUCScriptForPrincipalsVersion(JSContext *cx, JSObject *obj,
JSPrincipals *principals,
const jschar *chars, size_t length,
const char *filename, uintN lineno,
JSVersion version);
extern JS_PUBLIC_API(JSObject *)
JS_CompileFile(JSContext *cx, JSObject *obj, const char *filename);
extern JS_PUBLIC_API(JSObject *)
JS_CompileFileHandle(JSContext *cx, JSObject *obj, const char *filename,
FILE *fh);
extern JS_PUBLIC_API(JSObject *)
JS_CompileFileHandleForPrincipals(JSContext *cx, JSObject *obj,
const char *filename, FILE *fh,
JSPrincipals *principals);
extern JS_PUBLIC_API(JSObject *)
JS_CompileFileHandleForPrincipalsVersion(JSContext *cx, JSObject *obj,
const char *filename, FILE *fh,
JSPrincipals *principals,
JSVersion version);
extern JS_PUBLIC_API(JSFunction *)
JS_CompileFunction(JSContext *cx, JSObject *obj, const char *name,
uintN nargs, const char **argnames,
const char *bytes, size_t length,
const char *filename, uintN lineno);
extern JS_PUBLIC_API(JSFunction *)
JS_CompileFunctionForPrincipals(JSContext *cx, JSObject *obj,
JSPrincipals *principals, const char *name,
uintN nargs, const char **argnames,
const char *bytes, size_t length,
const char *filename, uintN lineno);
extern JS_PUBLIC_API(JSFunction *)
JS_CompileUCFunction(JSContext *cx, JSObject *obj, const char *name,
uintN nargs, const char **argnames,
const jschar *chars, size_t length,
const char *filename, uintN lineno);
extern JS_PUBLIC_API(JSFunction *)
JS_CompileUCFunctionForPrincipals(JSContext *cx, JSObject *obj,
JSPrincipals *principals, const char *name,
uintN nargs, const char **argnames,
const jschar *chars, size_t length,
const char *filename, uintN lineno);
extern JS_PUBLIC_API(JSFunction *)
JS_CompileUCFunctionForPrincipalsVersion(JSContext *cx, JSObject *obj,
JSPrincipals *principals, const char *name,
uintN nargs, const char **argnames,
const jschar *chars, size_t length,
const char *filename, uintN lineno,
JSVersion version);
extern JS_PUBLIC_API(JSString *)
JS_DecompileScriptObject(JSContext *cx, JSObject *scriptObj, const char *name, uintN indent);
/*
* API extension: OR this into indent to avoid pretty-printing the decompiled
* source resulting from JS_DecompileFunction{,Body}.
*/
#define JS_DONT_PRETTY_PRINT ((uintN)0x8000)
extern JS_PUBLIC_API(JSString *)
JS_DecompileFunction(JSContext *cx, JSFunction *fun, uintN indent);
extern JS_PUBLIC_API(JSString *)
JS_DecompileFunctionBody(JSContext *cx, JSFunction *fun, uintN 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 JS_SetOptions(cx, JSOPTION_VAROBJFIX) or
* JS_SetOptions(cx, JS_GetOptions(cx) | JSOPTION_VAROBJFIX) -- the latter if
* someone may have set other options on cx already -- 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(JSBool)
JS_ExecuteScript(JSContext *cx, JSObject *obj, JSObject *scriptObj, jsval *rval);
extern JS_PUBLIC_API(JSBool)
JS_ExecuteScriptVersion(JSContext *cx, JSObject *obj, JSObject *scriptObj, jsval *rval,
JSVersion version);
/*
* Execute either the function-defining prolog of a script, or the script's
* main body, but not both.
*/
typedef enum JSExecPart { JSEXEC_PROLOG, JSEXEC_MAIN } JSExecPart;
extern JS_PUBLIC_API(JSBool)
JS_EvaluateScript(JSContext *cx, JSObject *obj,
const char *bytes, uintN length,
const char *filename, uintN lineno,
jsval *rval);
extern JS_PUBLIC_API(JSBool)
JS_EvaluateScriptForPrincipals(JSContext *cx, JSObject *obj,
JSPrincipals *principals,
const char *bytes, uintN length,
const char *filename, uintN lineno,
jsval *rval);
extern JS_PUBLIC_API(JSBool)
JS_EvaluateScriptForPrincipalsVersion(JSContext *cx, JSObject *obj,
JSPrincipals *principals,
const char *bytes, uintN length,
const char *filename, uintN lineno,
jsval *rval, JSVersion version);
extern JS_PUBLIC_API(JSBool)
JS_EvaluateUCScript(JSContext *cx, JSObject *obj,
const jschar *chars, uintN length,
const char *filename, uintN lineno,
jsval *rval);
extern JS_PUBLIC_API(JSBool)
JS_EvaluateUCScriptForPrincipalsVersion(JSContext *cx, JSObject *obj,
JSPrincipals *principals,
const jschar *chars, uintN length,
const char *filename, uintN lineno,
jsval *rval, JSVersion version);
extern JS_PUBLIC_API(JSBool)
JS_EvaluateUCScriptForPrincipals(JSContext *cx, JSObject *obj,
JSPrincipals *principals,
const jschar *chars, uintN length,
const char *filename, uintN lineno,
jsval *rval);
extern JS_PUBLIC_API(JSBool)
JS_CallFunction(JSContext *cx, JSObject *obj, JSFunction *fun, uintN argc,
jsval *argv, jsval *rval);
extern JS_PUBLIC_API(JSBool)
JS_CallFunctionName(JSContext *cx, JSObject *obj, const char *name, uintN argc,
jsval *argv, jsval *rval);
extern JS_PUBLIC_API(JSBool)
JS_CallFunctionValue(JSContext *cx, JSObject *obj, jsval fval, uintN argc,
jsval *argv, jsval *rval);
#ifdef __cplusplus
JS_END_EXTERN_C
namespace JS {
static inline bool
Call(JSContext *cx, JSObject *thisObj, JSFunction *fun, uintN argc, jsval *argv, jsval *rval) {
return !!JS_CallFunction(cx, thisObj, fun, argc, argv, rval);
}
static inline bool
Call(JSContext *cx, JSObject *thisObj, const char *name, uintN argc, jsval *argv, jsval *rval) {
return !!JS_CallFunctionName(cx, thisObj, name, argc, argv, rval);
}
static inline bool
Call(JSContext *cx, JSObject *thisObj, jsval fun, uintN argc, jsval *argv, jsval *rval) {
return !!JS_CallFunctionValue(cx, thisObj, fun, argc, argv, rval);
}
extern JS_PUBLIC_API(bool)
Call(JSContext *cx, jsval thisv, jsval fun, uintN argc, jsval *argv, jsval *rval);
static inline bool
Call(JSContext *cx, jsval thisv, JSObject *funObj, uintN argc, jsval *argv, jsval *rval) {
return Call(cx, thisv, OBJECT_TO_JSVAL(funObj), argc, argv, rval);
}
} /* namespace js */
JS_BEGIN_EXTERN_C
#endif /* __cplusplus */
/*
* These functions allow setting an operation callback that will be called
* from the thread the context is associated with some time after any thread
* triggered the callback using JS_TriggerOperationCallback(cx).
*
* In a threadsafe build the engine internally triggers operation callbacks
* under certain circumstances (i.e. GC and title transfer) to force the
* context to yield its current request, which the engine always
* automatically does immediately prior to calling the callback function.
* 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(JSOperationCallback)
JS_SetOperationCallback(JSContext *cx, JSOperationCallback callback);
extern JS_PUBLIC_API(JSOperationCallback)
JS_GetOperationCallback(JSContext *cx);
extern JS_PUBLIC_API(void)
JS_TriggerOperationCallback(JSContext *cx);
extern JS_PUBLIC_API(void)
JS_TriggerAllOperationCallbacks(JSRuntime *rt);
extern JS_PUBLIC_API(JSBool)
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(JSBool)
JS_SaveFrameChain(JSContext *cx);
extern JS_PUBLIC_API(void)
JS_RestoreFrameChain(JSContext *cx);
/************************************************************************/
/*
* 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, JSString *str);
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(JSBool)
JS_CompareStrings(JSContext *cx, JSString *str1, JSString *str2, int32 *result);
extern JS_PUBLIC_API(JSBool)
JS_StringEqualsAscii(JSContext *cx, JSString *str, const char *asciiBytes, JSBool *match);
extern JS_PUBLIC_API(size_t)
JS_PutEscapedString(JSContext *cx, char *buffer, size_t size, JSString *str, char quote);
extern JS_PUBLIC_API(JSBool)
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_GetInternedStringChars*.
*
* 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 so only one needs to be rooted. 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 JS_FALSE;
* JS_ASSERT(fstr == JS_ASSERT_STRING_IS_FLAT(str));
*
* // in an infallible context, for the same 'str'
* const jschar *chars = JS_GetFlatStringChars(fstr)
* JS_ASSERT(chars);
*
* The CharsZ APIs guarantee that the returned array has a null character at
* chars[length]. This can require additional copying so clients should prefer
* APIs without CharsZ if possible. The infallible functions also return
* null-terminated arrays. (There is no additional cost or non-Z alternative
* for the infallible functions, so 'Z' is left out of the identifier.)
*/
extern JS_PUBLIC_API(size_t)
JS_GetStringLength(JSString *str);
extern JS_PUBLIC_API(const jschar *)
JS_GetStringCharsAndLength(JSContext *cx, JSString *str, size_t *length);
extern JS_PUBLIC_API(const jschar *)
JS_GetInternedStringChars(JSString *str);
extern JS_PUBLIC_API(const jschar *)
JS_GetInternedStringCharsAndLength(JSString *str, size_t *length);
extern JS_PUBLIC_API(const jschar *)
JS_GetStringCharsZ(JSContext *cx, JSString *str);
extern JS_PUBLIC_API(const jschar *)
JS_GetStringCharsZAndLength(JSContext *cx, JSString *str, size_t *length);
extern JS_PUBLIC_API(JSFlatString *)
JS_FlattenString(JSContext *cx, JSString *str);
extern JS_PUBLIC_API(const jschar *)
JS_GetFlatStringChars(JSFlatString *str);
static JS_ALWAYS_INLINE JSFlatString *
JSID_TO_FLAT_STRING(jsid id)
{
JS_ASSERT(JSID_IS_STRING(id));
return (JSFlatString *)(JSID_BITS(id));
}
static JS_ALWAYS_INLINE JSFlatString *
JS_ASSERT_STRING_IS_FLAT(JSString *str)
{
JS_ASSERT(JS_GetFlatStringChars((JSFlatString *)str));
return (JSFlatString *)str;
}
static JS_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(JSBool)
JS_FlatStringEqualsAscii(JSFlatString *str, const char *asciiBytes);
extern JS_PUBLIC_API(size_t)
JS_PutEscapedFlatString(char *buffer, size_t size, JSFlatString *str, char quote);
/*
* This function is now obsolete and behaves the same as JS_NewUCString. Use
* JS_NewUCString instead.
*/
extern JS_PUBLIC_API(JSString *)
JS_NewGrowableString(JSContext *cx, jschar *chars, size_t length);
/*
* Mutable string support. A string's characters are never mutable in this JS
* implementation, but a dependent string is a substring of another dependent
* or immutable string, and a rope is a lazily concatenated string that creates
* its underlying buffer the first time it is accessed. Even after a rope
* creates its underlying buffer, it still considered mutable. The direct data
* members of the (opaque to API clients) JSString struct may be changed in a
* single-threaded way for dependent strings and ropes.
*
* Therefore mutable strings (ropes and dependent strings) cannot be used by
* more than one thread at a time. You may call JS_MakeStringImmutable to
* convert the string from a mutable string to an immutable (and therefore
* thread-safe) string. The engine takes care of converting ropes and dependent
* strings to immutable for you if you store strings in multi-threaded objects
* using JS_SetProperty or kindred API entry points.
*
* If you store a JSString pointer in a native data structure that is (safely)
* accessible to multiple threads, you must call JS_MakeStringImmutable before
* retiring the store.
*/
/*
* 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, JSString *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, JSString *left, JSString *right);
/*
* Convert a dependent string into an independent one. This function does not
* change the string's mutability, so the thread safety comments above apply.
*/
extern JS_PUBLIC_API(const jschar *)
JS_UndependString(JSContext *cx, JSString *str);
/*
* Convert a mutable string (either rope or dependent) into an immutable,
* thread-safe one.
*/
extern JS_PUBLIC_API(JSBool)
JS_MakeStringImmutable(JSContext *cx, JSString *str);
/*
* Return JS_TRUE if C (char []) strings passed via the API and internally
* are UTF-8.
*/
JS_PUBLIC_API(JSBool)
JS_CStringsAreUTF8(void);
/*
* Update the value to be returned by JS_CStringsAreUTF8(). Once set, it
* can never be changed. This API must be called before the first call to
* JS_NewRuntime.
*/
JS_PUBLIC_API(void)
JS_SetCStringsAreUTF8(void);
/*
* Character encoding support.
*
* For both JS_EncodeCharacters and JS_DecodeBytes, set *dstlenp to the size
* of the destination buffer before the call; on return, *dstlenp contains the
* number of bytes (JS_EncodeCharacters) or jschars (JS_DecodeBytes) actually
* stored. To determine the necessary destination buffer size, make a sizing
* call that passes NULL 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 NULL, no
* error is reported on failure, and the functions simply return JS_FALSE.
*
* NB: Neither function stores an additional zero byte or jschar after the
* transcoded string.
*
* If JS_CStringsAreUTF8() is true then JS_EncodeCharacters encodes to
* UTF-8, and JS_DecodeBytes decodes from UTF-8, which may create additional
* errors if the character sequence is malformed. If UTF-8 support is
* disabled, the functions deflate and inflate, respectively.
*
* JS_DecodeUTF8() always behaves the same independently of JS_CStringsAreUTF8().
*/
JS_PUBLIC_API(JSBool)
JS_EncodeCharacters(JSContext *cx, const jschar *src, size_t srclen, char *dst,
size_t *dstlenp);
JS_PUBLIC_API(JSBool)
JS_DecodeBytes(JSContext *cx, const char *src, size_t srclen, jschar *dst,
size_t *dstlenp);
JS_PUBLIC_API(JSBool)
JS_DecodeUTF8(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);
/*
* 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.
*
* If JS_CStringsAreUTF8() is true, the string does not fit into the buffer
* and the the first length bytes ends in the middle of utf-8 encoding for
* some character, then such partial utf-8 encoding is replaced by zero bytes.
* This way the result always represents the valid UTF-8 sequence.
*/
JS_PUBLIC_API(size_t)
JS_EncodeStringToBuffer(JSString *str, char *buffer, size_t length);
#ifdef __cplusplus
class JSAutoByteString {
public:
JSAutoByteString(JSContext *cx, JSString *str JS_GUARD_OBJECT_NOTIFIER_PARAM)
: mBytes(JS_EncodeString(cx, str)) {
JS_ASSERT(cx);
JS_GUARD_OBJECT_NOTIFIER_INIT;
}
JSAutoByteString(JS_GUARD_OBJECT_NOTIFIER_PARAM0)
: mBytes(NULL) {
JS_GUARD_OBJECT_NOTIFIER_INIT;
}
~JSAutoByteString() {
js::UnwantedForeground::free_(mBytes);
}
/* Take ownership of the given byte array. */
void initBytes(char *bytes) {
JS_ASSERT(!mBytes);
mBytes = bytes;
}
char *encode(JSContext *cx, JSString *str) {
JS_ASSERT(!mBytes);
JS_ASSERT(cx);
mBytes = JS_EncodeString(cx, str);
return mBytes;
}
void clear() {
js::UnwantedForeground::free_(mBytes);
mBytes = NULL;
}
char *ptr() const {
return mBytes;
}
bool operator!() const {
return !mBytes;
}
private:
char *mBytes;
JS_DECL_USE_GUARD_OBJECT_NOTIFIER
/* Copy and assignment are not supported. */
JSAutoByteString(const JSAutoByteString &another);
JSAutoByteString &operator=(const JSAutoByteString &another);
};
#endif
/************************************************************************/
/*
* JSON functions
*/
typedef JSBool (* JSONWriteCallback)(const jschar *buf, uint32 len, void *data);
/*
* JSON.stringify as specified by ES5.
*/
JS_PUBLIC_API(JSBool)
JS_Stringify(JSContext *cx, jsval *vp, JSObject *replacer, jsval space,
JSONWriteCallback callback, void *data);
/*
* JSON.parse as specified by ES5.
*/
JS_PUBLIC_API(JSBool)
JS_ParseJSON(JSContext *cx, const jschar *chars, uint32 len, jsval *vp);
JS_PUBLIC_API(JSBool)
JS_ParseJSONWithReviver(JSContext *cx, const jschar *chars, uint32 len, jsval reviver, jsval *vp);
/************************************************************************/
/* API for the HTML5 internal structured cloning algorithm. */
/* The maximum supported structured-clone serialization format version. */
#define JS_STRUCTURED_CLONE_VERSION 1
struct JSStructuredCloneCallbacks {
ReadStructuredCloneOp read;
WriteStructuredCloneOp write;
StructuredCloneErrorOp reportError;
};
JS_PUBLIC_API(JSBool)
JS_ReadStructuredClone(JSContext *cx, const uint64 *data, size_t nbytes,
uint32 version, jsval *vp,
const JSStructuredCloneCallbacks *optionalCallbacks,
void *closure);
/* Note: On success, the caller is responsible for calling js::Foreground::free(*datap). */
JS_PUBLIC_API(JSBool)
JS_WriteStructuredClone(JSContext *cx, jsval v, uint64 **datap, size_t *nbytesp,
const JSStructuredCloneCallbacks *optionalCallbacks,
void *closure);
JS_PUBLIC_API(JSBool)
JS_StructuredClone(JSContext *cx, jsval v, jsval *vp,
const JSStructuredCloneCallbacks *optionalCallbacks,
void *closure);
#ifdef __cplusplus
JS_END_EXTERN_C
/* RAII sugar for JS_WriteStructuredClone. */
class JS_PUBLIC_API(JSAutoStructuredCloneBuffer) {
JSUint64 *data_;
size_t nbytes_;
JSUint32 version_;
public:
JSAutoStructuredCloneBuffer()
: data_(NULL), nbytes_(0), version_(JS_STRUCTURED_CLONE_VERSION) {}
~JSAutoStructuredCloneBuffer() { clear(); }
JSUint64 *data() const { return data_; }
size_t nbytes() const { return nbytes_; }
void clear();
/* Copy some memory. It will be automatically freed by the destructor. */
bool copy(const JSUint64 *data, size_t nbytes, JSUint32 version=JS_STRUCTURED_CLONE_VERSION);
/*
* Adopt some memory. It will be automatically freed by the destructor.
* data must have been allocated by the JS engine (e.g., extracted via
* JSAutoStructuredCloneBuffer::steal).
*/
void adopt(JSUint64 *data, size_t nbytes, JSUint32 version=JS_STRUCTURED_CLONE_VERSION);
/*
* Remove the buffer so that it will not be automatically freed.
* After this, the caller is responsible for feeding the memory back to
* JSAutoStructuredCloneBuffer::adopt.
*/
void steal(JSUint64 **datap, size_t *nbytesp, JSUint32 *versionp=NULL);
bool read(JSContext *cx, jsval *vp,
const JSStructuredCloneCallbacks *optionalCallbacks=NULL,
void *closure=NULL) const;
bool write(JSContext *cx, jsval v,
const JSStructuredCloneCallbacks *optionalCallbacks=NULL,
void *closure=NULL);
/**
* Swap ownership with another JSAutoStructuredCloneBuffer.
*/
void swap(JSAutoStructuredCloneBuffer &other);
private:
/* Copy and assignment are not supported. */
JSAutoStructuredCloneBuffer(const JSAutoStructuredCloneBuffer &other);
JSAutoStructuredCloneBuffer &operator=(const JSAutoStructuredCloneBuffer &other);
};
JS_BEGIN_EXTERN_C
#endif
/* API for implementing custom serialization behavior (for ImageData, File, etc.) */
/* The range of tag values the application may use for its own custom object types. */
#define JS_SCTAG_USER_MIN ((uint32) 0xFFFF8000)
#define JS_SCTAG_USER_MAX ((uint32) 0xFFFFFFFF)
#define JS_SCERR_RECURSION 0
JS_PUBLIC_API(void)
JS_SetStructuredCloneCallbacks(JSRuntime *rt, const JSStructuredCloneCallbacks *callbacks);
JS_PUBLIC_API(JSBool)
JS_ReadUint32Pair(JSStructuredCloneReader *r, uint32 *p1, uint32 *p2);
JS_PUBLIC_API(JSBool)
JS_ReadBytes(JSStructuredCloneReader *r, void *p, size_t len);
JS_PUBLIC_API(JSBool)
JS_WriteUint32Pair(JSStructuredCloneWriter *w, uint32 tag, uint32 data);
JS_PUBLIC_API(JSBool)
JS_WriteBytes(JSStructuredCloneWriter *w, const void *p, size_t len);
/************************************************************************/
/*
* Locale specific string conversion and error message callbacks.
*/
struct JSLocaleCallbacks {
JSLocaleToUpperCase localeToUpperCase;
JSLocaleToLowerCase localeToLowerCase;
JSLocaleCompare localeCompare;
JSLocaleToUnicode localeToUnicode;
JSErrorCallback localeGetErrorMessage;
};
/*
* Establish locale callbacks. The pointer must persist as long as the
* JSContext. Passing NULL restores the default behaviour.
*/
extern JS_PUBLIC_API(void)
JS_SetLocaleCallbacks(JSContext *cx, JSLocaleCallbacks *callbacks);
/*
* Return the address of the current locale callbacks struct, which may
* be NULL.
*/
extern JS_PUBLIC_API(JSLocaleCallbacks *)
JS_GetLocaleCallbacks(JSContext *cx);
/************************************************************************/
/*
* 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; see jspubtd.h for
* the JSErrorReporter typedef).
*/
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 uintN errorNumber, ...);
/*
* 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 uintN errorNumber, ...);
/*
* 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(JSBool)
JS_ReportWarning(JSContext *cx, const char *format, ...);
extern JS_PUBLIC_API(JSBool)
JS_ReportErrorFlagsAndNumber(JSContext *cx, uintN flags,
JSErrorCallback errorCallback, void *userRef,
const uintN errorNumber, ...);
extern JS_PUBLIC_API(JSBool)
JS_ReportErrorFlagsAndNumberUC(JSContext *cx, uintN flags,
JSErrorCallback errorCallback, void *userRef,
const uintN 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 */
uintN 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 */
uintN flags; /* error/warning, etc. */
uintN errorNumber; /* the error number, e.g. see js.msg */
const jschar *ucmessage; /* the (default) error message */
const jschar **messageArgs; /* arguments for the error message */
};
/*
* 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_SetErrorReporter(JSContext *cx, JSErrorReporter er);
/************************************************************************/
/*
* 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, jsdouble msec);
/*
* Infallible predicate to test whether obj is a date object.
*/
extern JS_PUBLIC_API(JSBool)
JS_ObjectIsDate(JSContext *cx, JSObject *obj);
/************************************************************************/
/*
* Regular Expressions.
*/
#define JSREG_FOLD 0x01 /* fold uppercase to lowercase */
#define JSREG_GLOB 0x02 /* global exec, creates array of matches */
#define JSREG_MULTILINE 0x04 /* treat ^ and $ as begin and end of line */
#define JSREG_STICKY 0x08 /* only match starting at lastIndex */
#define JSREG_FLAT 0x10 /* parse as a flat regexp */
#define JSREG_NOCOMPILE 0x20 /* do not try to compile to native code */
extern JS_PUBLIC_API(JSObject *)
JS_NewRegExpObject(JSContext *cx, JSObject *obj, char *bytes, size_t length, uintN flags);
extern JS_PUBLIC_API(JSObject *)
JS_NewUCRegExpObject(JSContext *cx, JSObject *obj, jschar *chars, size_t length, uintN flags);
extern JS_PUBLIC_API(void)
JS_SetRegExpInput(JSContext *cx, JSObject *obj, JSString *input, JSBool multiline);
extern JS_PUBLIC_API(void)
JS_ClearRegExpStatics(JSContext *cx, JSObject *obj);
extern JS_PUBLIC_API(JSBool)
JS_ExecuteRegExp(JSContext *cx, JSObject *obj, JSObject *reobj, jschar *chars, size_t length,
size_t *indexp, JSBool test, jsval *rval);
/* RegExp interface for clients without a global object. */
extern JS_PUBLIC_API(JSObject *)
JS_NewRegExpObjectNoStatics(JSContext *cx, char *bytes, size_t length, uintN flags);
extern JS_PUBLIC_API(JSObject *)
JS_NewUCRegExpObjectNoStatics(JSContext *cx, jschar *chars, size_t length, uintN flags);
extern JS_PUBLIC_API(JSBool)
JS_ExecuteRegExpNoStatics(JSContext *cx, JSObject *reobj, jschar *chars, size_t length,
size_t *indexp, JSBool test, jsval *rval);
extern JS_PUBLIC_API(JSBool)
JS_ObjectIsRegExp(JSContext *cx, JSObject *obj);
extern JS_PUBLIC_API(uintN)
JS_GetRegExpFlags(JSContext *cx, JSObject *obj);
extern JS_PUBLIC_API(JSString *)
JS_GetRegExpSource(JSContext *cx, JSObject *obj);
/************************************************************************/
extern JS_PUBLIC_API(JSBool)
JS_IsExceptionPending(JSContext *cx);
extern JS_PUBLIC_API(JSBool)
JS_GetPendingException(JSContext *cx, jsval *vp);
extern JS_PUBLIC_API(void)
JS_SetPendingException(JSContext *cx, jsval v);
extern JS_PUBLIC_API(void)
JS_ClearPendingException(JSContext *cx);
extern JS_PUBLIC_API(JSBool)
JS_ReportPendingException(JSContext *cx);
/*
* Save the current exception state. This takes a snapshot of cx's current
* exception state without making any change to that state.
*
* The returned state pointer MUST be passed later to JS_RestoreExceptionState
* (to restore that saved state, overriding any more recent state) or else to
* JS_DropExceptionState (to free the state struct in case it is not correct
* or desirable to restore it). Both Restore and Drop free the state struct,
* so callers must stop using the pointer returned from Save after calling the
* Release or Drop API.
*/
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 value is an exception object that originated from an error,
* the exception will contain an error report struct, and this API will return
* the address of that struct. Otherwise, it returns NULL. 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, jsval v);
/*
* Given a reported error's message and JSErrorReport struct pointer, throw
* the corresponding exception on cx.
*/
extern JS_PUBLIC_API(JSBool)
JS_ThrowReportedError(JSContext *cx, const char *message,
JSErrorReport *reportp);
/*
* Throws a StopIteration exception on cx.
*/
extern JS_PUBLIC_API(JSBool)
JS_ThrowStopIteration(JSContext *cx);
/*
* Associate the current thread with the given context. This is done
* implicitly by JS_NewContext.
*
* Returns the old thread id for this context, which should be treated as
* an opaque value. This value is provided for comparison to 0, which
* indicates that ClearContextThread has been called on this context
* since the last SetContextThread, or non-0, which indicates the opposite.
*/
extern JS_PUBLIC_API(jsword)
JS_GetContextThread(JSContext *cx);
extern JS_PUBLIC_API(jsword)
JS_SetContextThread(JSContext *cx);
extern JS_PUBLIC_API(jsword)
JS_ClearContextThread(JSContext *cx);
/************************************************************************/
/*
* JS_IsConstructing must be called from within a native given the
* native's original cx and vp arguments. If JS_IsConstructing is true,
* JS_THIS must not be used; the constructor should construct and return a
* new object. Otherwise, the native is called as an ordinary function and
* JS_THIS may be used.
*/
static JS_ALWAYS_INLINE JSBool
JS_IsConstructing(JSContext *cx, const jsval *vp)
{
jsval_layout l;
#ifdef DEBUG
JSObject *callee = JSVAL_TO_OBJECT(JS_CALLEE(cx, vp));
if (JS_ObjectIsFunction(cx, callee)) {
JSFunction *fun = JS_ValueToFunction(cx, JS_CALLEE(cx, vp));
JS_ASSERT((JS_GetFunctionFlags(fun) & JSFUN_CONSTRUCTOR) != 0);
} else {
JS_ASSERT(JS_GET_CLASS(cx, callee)->construct != NULL);
}
#endif
l.asBits = JSVAL_BITS(vp[1]);
return JSVAL_IS_MAGIC_IMPL(l);
}
/*
* In the case of a constructor called from JS_ConstructObject and
* JS_InitClass where the class has the JSCLASS_CONSTRUCT_PROTOTYPE flag set,
* the JS engine passes the constructor a non-standard 'this' object. In such
* cases, the following query provides the additional information of whether a
* special 'this' was supplied. E.g.:
*
* JSBool foo_native(JSContext *cx, uintN argc, jsval *vp) {
* JSObject *maybeThis;
* if (JS_IsConstructing_PossiblyWithGivenThisObject(cx, vp, &maybeThis)) {
* // native called as a constructor
* if (maybeThis)
* // native called as a constructor with maybeThis as 'this'
* } else {
* // native called as function, maybeThis is still uninitialized
* }
* }
*
* Note that embeddings do not need to use this query unless they use the
* aforementioned API/flags.
*/
static JS_ALWAYS_INLINE JSBool
JS_IsConstructing_PossiblyWithGivenThisObject(JSContext *cx, const jsval *vp,
JSObject **maybeThis)
{
jsval_layout l;
JSBool isCtor;
#ifdef DEBUG
JSObject *callee = JSVAL_TO_OBJECT(JS_CALLEE(cx, vp));
if (JS_ObjectIsFunction(cx, callee)) {
JSFunction *fun = JS_ValueToFunction(cx, JS_CALLEE(cx, vp));
JS_ASSERT((JS_GetFunctionFlags(fun) & JSFUN_CONSTRUCTOR) != 0);
} else {
JS_ASSERT(JS_GET_CLASS(cx, callee)->construct != NULL);
}
#endif
l.asBits = JSVAL_BITS(vp[1]);
isCtor = JSVAL_IS_MAGIC_IMPL(l);
if (isCtor)
*maybeThis = MAGIC_JSVAL_TO_OBJECT_OR_NULL_IMPL(l);
return isCtor;
}
/*
* If a constructor does not have any static knowledge about the type of
* object to create, it can request that the JS engine create a default new
* 'this' object, as is done for non-constructor natives when called with new.
*/
extern JS_PUBLIC_API(JSObject *)
JS_NewObjectForConstructor(JSContext *cx, const jsval *vp);
/************************************************************************/
#ifdef DEBUG
#define JS_GC_ZEAL 1
#endif
#ifdef JS_GC_ZEAL
#define JS_DEFAULT_ZEAL_FREQ 100
extern JS_PUBLIC_API(void)
JS_SetGCZeal(JSContext *cx, uint8 zeal, uint32 frequency, JSBool compartment);
extern JS_PUBLIC_API(void)
JS_ScheduleGC(JSContext *cx, uint32 count, JSBool compartment);
#endif
JS_END_EXTERN_C
#endif /* jsapi_h___ */
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