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C/C++ Source or Header | 2006-05-08 | 74.9 KB | 1,984 lines

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- * * ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is Mozilla Communicator client code, released * March 31, 1998. * * The Initial Developer of the Original Code is * Netscape Communications Corporation. * Portions created by the Initial Developer are Copyright (C) 1998 * the Initial Developer. All Rights Reserved. * * Contributor(s): * * Alternatively, the contents of this file may be used under the terms of * either of the GNU General Public License Version 2 or later (the "GPL"), * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ #ifndef jsapi_h___ #define jsapi_h___ /* * JavaScript API. */ #include <stddef.h> #include <stdio.h> #include "jspubtd.h" JS_BEGIN_EXTERN_C /* * Type tags stored in the low bits of a jsval. */ #define JSVAL_OBJECT 0x0 /* untagged reference to object */ #define JSVAL_INT 0x1 /* tagged 31-bit integer value */ #define JSVAL_DOUBLE 0x2 /* tagged reference to double */ #define JSVAL_STRING 0x4 /* tagged reference to string */ #define JSVAL_BOOLEAN 0x6 /* tagged boolean value */ /* Type tag bitfield length and derived macros. */ #define JSVAL_TAGBITS 3 #define JSVAL_TAGMASK JS_BITMASK(JSVAL_TAGBITS) #define JSVAL_TAG(v) ((v) & JSVAL_TAGMASK) #define JSVAL_SETTAG(v,t) ((v) | (t)) #define JSVAL_CLRTAG(v) ((v) & ~(jsval)JSVAL_TAGMASK) #define JSVAL_ALIGN JS_BIT(JSVAL_TAGBITS) /* Predicates for type testing. */ #define JSVAL_IS_OBJECT(v) (JSVAL_TAG(v) == JSVAL_OBJECT) #define JSVAL_IS_NUMBER(v) (JSVAL_IS_INT(v) || JSVAL_IS_DOUBLE(v)) #define JSVAL_IS_INT(v) (((v) & JSVAL_INT) && (v) != JSVAL_VOID) #define JSVAL_IS_DOUBLE(v) (JSVAL_TAG(v) == JSVAL_DOUBLE) #define JSVAL_IS_STRING(v) (JSVAL_TAG(v) == JSVAL_STRING) #define JSVAL_IS_BOOLEAN(v) (JSVAL_TAG(v) == JSVAL_BOOLEAN) #define JSVAL_IS_NULL(v) ((v) == JSVAL_NULL) #define JSVAL_IS_VOID(v) ((v) == JSVAL_VOID) #define JSVAL_IS_PRIMITIVE(v) (!JSVAL_IS_OBJECT(v) || JSVAL_IS_NULL(v)) /* Objects, strings, and doubles are GC'ed. */ #define JSVAL_IS_GCTHING(v) (!((v) & JSVAL_INT) && !JSVAL_IS_BOOLEAN(v)) #define JSVAL_TO_GCTHING(v) ((void *)JSVAL_CLRTAG(v)) #define JSVAL_TO_OBJECT(v) ((JSObject *)JSVAL_TO_GCTHING(v)) #define JSVAL_TO_DOUBLE(v) ((jsdouble *)JSVAL_TO_GCTHING(v)) #define JSVAL_TO_STRING(v) ((JSString *)JSVAL_TO_GCTHING(v)) #define OBJECT_TO_JSVAL(obj) ((jsval)(obj)) #define DOUBLE_TO_JSVAL(dp) JSVAL_SETTAG((jsval)(dp), JSVAL_DOUBLE) #define STRING_TO_JSVAL(str) JSVAL_SETTAG((jsval)(str), JSVAL_STRING) /* 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) /* Domain limits for the jsval int type. */ #define JSVAL_INT_BITS 31 #define JSVAL_INT_POW2(n) ((jsval)1 << (n)) #define JSVAL_INT_MIN ((jsval)1 - JSVAL_INT_POW2(30)) #define JSVAL_INT_MAX (JSVAL_INT_POW2(30) - 1) #define INT_FITS_IN_JSVAL(i) ((jsuint)((i)+JSVAL_INT_MAX) <= 2*JSVAL_INT_MAX) #define JSVAL_TO_INT(v) ((jsint)(v) >> 1) #define INT_TO_JSVAL(i) (((jsval)(i) << 1) | JSVAL_INT) /* Convert between boolean and jsval. */ #define JSVAL_TO_BOOLEAN(v) ((JSBool)((v) >> JSVAL_TAGBITS)) #define BOOLEAN_TO_JSVAL(b) JSVAL_SETTAG((jsval)(b) << JSVAL_TAGBITS, \ JSVAL_BOOLEAN) /* A private data pointer (2-byte-aligned) can be stored as an int jsval. */ #define JSVAL_TO_PRIVATE(v) ((void *)((v) & ~JSVAL_INT)) #define PRIVATE_TO_JSVAL(p) ((jsval)(p) | JSVAL_INT) /* 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_EXPORTED 0x08 /* property is exported from object */ #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 */ /* Function flags, set in JSFunctionSpec and passed to JS_NewFunction etc. */ #define JSFUN_LAMBDA 0x08 /* expressed, not declared, function */ #define JSFUN_GETTER JSPROP_GETTER #define JSFUN_SETTER JSPROP_SETTER #define JSFUN_BOUND_METHOD 0x40 /* bind this to fun->object's parent */ #define JSFUN_HEAVYWEIGHT 0x80 /* activation requires a Call object */ #define JSFUN_FLAGS_MASK 0xf8 /* overlay JSFUN_* attributes */ /* * 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 /* * Well-known JS values. The extern'd variables are initialized when the * first JSContext is created by JS_NewContext (see below). */ #define JSVAL_VOID INT_TO_JSVAL(0 - JSVAL_INT_POW2(30)) #define JSVAL_NULL OBJECT_TO_JSVAL(0) #define JSVAL_ZERO INT_TO_JSVAL(0) #define JSVAL_ONE INT_TO_JSVAL(1) #define JSVAL_FALSE BOOLEAN_TO_JSVAL(JS_FALSE) #define JSVAL_TRUE BOOLEAN_TO_JSVAL(JS_TRUE) /* * 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(); /* 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); /* * 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 char * C string * 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 /* * Inverse of JS_ConvertArguments: scan format and convert trailing arguments * into jsvals, GC-rooted if necessary by the JS stack. Return null on error, * and a pointer to the new argument vector on success. Also return a stack * mark on success via *markp, in which case the caller must eventually clean * up by calling JS_PopArguments. * * Note that the number of actual arguments supplied is specified exclusively * by format, so there is no argc parameter. */ extern JS_PUBLIC_API(jsval *) JS_PushArguments(JSContext *cx, void **markp, const char *format, ...); #ifdef va_start extern JS_PUBLIC_API(jsval *) JS_PushArgumentsVA(JSContext *cx, void **markp, const char *format, va_list ap); #endif extern JS_PUBLIC_API(void) JS_PopArguments(JSContext *cx, void *mark); #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(JSBool) JS_ValueToNumber(JSContext *cx, jsval v, jsdouble *dp); /* * 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); /************************************************************************/ /* * Initialization, locking, contexts, and memory allocation. */ #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); 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); #ifdef JS_THREADSAFE 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); #endif /* JS_THREADSAFE */ extern JS_PUBLIC_API(void) JS_Lock(JSRuntime *rt); extern JS_PUBLIC_API(void) JS_Unlock(JSRuntime *rt); 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_NATIVE_BRANCH_CALLBACK \ JS_BIT(7) /* the branch callback set by JS_SetBranchCallback may be called with a null script parameter, by native code that loops intensively */ 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(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, jsval 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(JSObject *) JS_GetScopeChain(JSContext *cx); 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(char *) JS_strdup(JSContext *cx, const char *s); extern JS_PUBLIC_API(jsdouble *) JS_NewDouble(JSContext *cx, jsdouble d); extern JS_PUBLIC_API(JSBool) JS_NewDoubleValue(JSContext *cx, jsdouble d, jsval *rval); extern JS_PUBLIC_API(JSBool) JS_NewNumberValue(JSContext *cx, jsdouble d, jsval *rval); /* * A JS GC root is a pointer to a JSObject *, JSString *, or jsdouble * that * itself points into the GC heap (more recently, we support this extension: * a root may be a pointer to a jsval v for which JSVAL_IS_GCTHING(v) is true). * * Therefore, you never pass JSObject *obj to JS_AddRoot(cx, obj). You always * call JS_AddRoot(cx, &obj), passing obj by reference. And later, before obj * or the structure it is embedded within goes out of scope or is freed, you * must call JS_RemoveRoot(cx, &obj). * * Also, use JS_AddNamedRoot(cx, &structPtr->memberObj, "structPtr->memberObj") * in preference to JS_AddRoot(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_RemoveRoot(cx, &structPtr->memberObj) * before freeing structPtr's memory. */ extern JS_PUBLIC_API(JSBool) JS_AddRoot(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_AddRoot(cx,rp) JS_AddNamedRoot((cx), (rp), (__FILE__ ":" JS_TOKEN_TO_STRING(__LINE__)) #endif extern JS_PUBLIC_API(JSBool) JS_AddNamedRoot(JSContext *cx, void *rp, const char *name); extern JS_PUBLIC_API(JSBool) JS_AddNamedRootRT(JSRuntime *rt, void *rp, const char *name); extern JS_PUBLIC_API(JSBool) JS_RemoveRoot(JSContext *cx, void *rp); extern JS_PUBLIC_API(JSBool) JS_RemoveRootRT(JSRuntime *rt, void *rp); /* * The last GC thing of each type (object, string, double, external string * types) created on a given context is kept alive until another thing of the * same type is created, using a newborn root in the context. These newborn * roots help native code protect newly-created GC-things from GC invocations * activated before those things can be rooted using local or global roots. * * However, the newborn roots can also entrain great gobs of garbage, so the * JS_GC entry point clears them for the context on which GC is being forced. * Embeddings may need to do likewise for all contexts. * * See the scoped local root API immediately below for a better way to manage * newborns in cases where native hooks (functions, getters, setters, etc.) * create many GC-things, potentially without connecting them to predefined * local roots such as *rval or argv[i] in an active native function. Using * JS_EnterLocalRootScope disables updating of the context's per-gc-thing-type * newborn roots, until control flow unwinds and leaves the outermost nesting * local root scope. */ extern JS_PUBLIC_API(void) JS_ClearNewbornRoots(JSContext *cx); /* * Scoped local root management allows native functions, getter/setters, etc. * to avoid worrying about the newborn root pigeon-holes, overloading local * roots allocated in argv and *rval, or ending up having to call JS_Add*Root * and JS_RemoveRoot to manage global roots temporarily. * * Instead, calling JS_EnterLocalRootScope and JS_LeaveLocalRootScope around * the body of the native hook causes the engine to allocate a local root for * each newborn created in between the two API calls, using a local root stack * associated with cx. For example: * * JSBool * my_GetProperty(JSContext *cx, JSObject *obj, jsval id, jsval *vp) * { * JSBool ok; * * if (!JS_EnterLocalRootScope(cx)) * return JS_FALSE; * ok = my_GetPropertyBody(cx, obj, id, vp); * JS_LeaveLocalRootScope(cx); * return ok; * } * * NB: JS_LeaveLocalRootScope must be called once for every prior successful * call to JS_EnterLocalRootScope. If JS_EnterLocalRootScope fails, you must * not make the matching JS_LeaveLocalRootScope call. * * In case a native hook allocates many objects or other GC-things, but the * native protects some of those GC-things by storing them as property values * in an object that is itself protected, the hook can call JS_ForgetLocalRoot * to free the local root automatically pushed for the now-protected GC-thing. * * JS_ForgetLocalRoot works on any GC-thing allocated in the current local * root scope, but it's more time-efficient when called on references to more * recently created GC-things. Calling it successively on other than the most * recently allocated GC-thing will tend to average the time inefficiency, and * may risk O(n^2) growth rate, but in any event, you shouldn't allocate too * many local roots if you can root as you go (build a tree of objects from * the top down, forgetting each latest-allocated GC-thing immediately upon * linking it to its parent). */ extern JS_PUBLIC_API(JSBool) JS_EnterLocalRootScope(JSContext *cx); extern JS_PUBLIC_API(void) JS_LeaveLocalRootScope(JSContext *cx); extern JS_PUBLIC_API(void) JS_ForgetLocalRoot(JSContext *cx, void *thing); #ifdef DEBUG extern JS_PUBLIC_API(void) JS_DumpNamedRoots(JSRuntime *rt, void (*dump)(const char *name, void *rp, 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. * * 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 (* JS_DLL_CALLBACK JSGCRootMapFun)(void *rp, 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); /* * For implementors of JSObjectOps.mark, to mark a GC-thing reachable via a * property or other strong ref identified for debugging purposes by name. * The name argument's storage needs to live only as long as the call to * this routine. * * The final arg is used by GC_MARK_DEBUG code to build a ref path through * the GC's live thing graph. Implementors of JSObjectOps.mark should pass * its final arg through to this function when marking all GC-things that are * directly reachable from the object being marked. * * See the JSMarkOp typedef in jspubtd.h, and the JSObjectOps struct below. */ extern JS_PUBLIC_API(void) JS_MarkGCThing(JSContext *cx, void *thing, const char *name, void *arg); extern JS_PUBLIC_API(void) JS_GC(JSContext *cx); 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_IsAboutToBeFinalized(JSContext *cx, void *thing); typedef enum JSGCParamKey { JSGC_MAX_BYTES = 0, /* maximum nominal heap before last ditch GC */ JSGC_MAX_MALLOC_BYTES = 1 /* # of JS_malloc bytes before last ditch GC */ } JSGCParamKey; extern JS_PUBLIC_API(void) JS_SetGCParameter(JSRuntime *rt, JSGCParamKey key, uint32 value); /* * 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 special, type-specific finalization. The type code must * be a nonnegative return value from JS_AddExternalStringFinalizer. */ extern JS_PUBLIC_API(JSString *) JS_NewExternalString(JSContext *cx, jschar *chars, size_t length, intN type); /* * Returns the external-string finalizer index for this string, or -1 if it is * an "internal" (native to JS engine) string. */ extern JS_PUBLIC_API(intN) JS_GetExternalStringGCType(JSRuntime *rt, JSString *str); /* * Sets maximum (if stack grows upward) or minimum (downward) legal stack byte * address in limitAddr for the thread or process stack used by cx. To disable * stack size checking, pass 0 for limitAddr. */ extern JS_PUBLIC_API(void) JS_SetThreadStackLimit(JSContext *cx, jsuword limitAddr); /************************************************************************/ /* * Classes, objects, and properties. */ /* 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; JSPropertyOp setProperty; JSEnumerateOp enumerate; JSResolveOp resolve; JSConvertOp convert; JSFinalizeOp finalize; /* Optionally non-null members start here. */ JSGetObjectOps getObjectOps; JSCheckAccessOp checkAccess; JSNative call; JSNative construct; JSXDRObjectOp xdrObject; JSHasInstanceOp hasInstance; JSMarkOp mark; JSReserveSlotsOp reserveSlots; }; struct JSExtendedClass { JSClass base; JSEqualityOp equality; JSObjectOp outerObject; JSObjectOp innerObject; jsword reserved0; jsword reserved1; jsword reserved2; jsword reserved3; jsword reserved4; }; #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_SHARE_ALL_PROPERTIES (1<<4) /* all properties are SHARED */ #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) /* True if JSClass is really a JSExtendedClass. */ #define JSCLASS_IS_EXTENDED (1<<(JSCLASS_HIGH_FLAGS_SHIFT+0)) /* Initializer for unused members of statically initialized JSClass structs. */ #define JSCLASS_NO_OPTIONAL_MEMBERS 0,0,0,0,0,0,0,0 #define JSCLASS_NO_RESERVED_MEMBERS 0,0,0,0,0 /* For detailed comments on these function pointer types, see jspubtd.h. */ struct JSObjectOps { /* Mandatory non-null function pointer members. */ JSNewObjectMapOp newObjectMap; JSObjectMapOp destroyObjectMap; JSLookupPropOp lookupProperty; JSDefinePropOp defineProperty; JSPropertyIdOp getProperty; JSPropertyIdOp setProperty; JSAttributesOp getAttributes; JSAttributesOp setAttributes; JSPropertyIdOp deleteProperty; JSConvertOp defaultValue; JSNewEnumerateOp enumerate; JSCheckAccessIdOp checkAccess; /* Optionally non-null members start here. */ JSObjectOp thisObject; JSPropertyRefOp dropProperty; JSNative call; JSNative construct; JSXDRObjectOp xdrObject; JSHasInstanceOp hasInstance; JSSetObjectSlotOp setProto; JSSetObjectSlotOp setParent; JSMarkOp mark; JSFinalizeOp clear; JSGetRequiredSlotOp getRequiredSlot; JSSetRequiredSlotOp setRequiredSlot; }; struct JSXMLObjectOps { JSObjectOps base; JSGetMethodOp getMethod; JSSetMethodOp setMethod; JSEnumerateValuesOp enumerateValues; JSEqualityOp equality; JSConcatenateOp concatenate; }; /* * Classes that expose JSObjectOps via a non-null getObjectOps class hook may * derive a property structure from this struct, return a pointer to it from * lookupProperty and defineProperty, and use the pointer to avoid rehashing * in getAttributes and setAttributes. * * The jsid type contains either an int jsval (see JSVAL_IS_INT above), or an * internal pointer that is opaque to users of this API, but which users may * convert from and to a jsval using JS_ValueToId and JS_IdToValue. */ struct JSProperty { jsid id; }; 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); /* * The magic XML namespace id is int-tagged, but not a valid integer jsval. * Global object classes in embeddings that enable JS_HAS_XML_SUPPORT (E4X) * should handle this id specially before converting id via JSVAL_TO_INT. */ #define JS_DEFAULT_XML_NAMESPACE_ID ((jsid) JSVAL_VOID) /* * 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 */ extern JS_PUBLIC_API(JSBool) JS_PropertyStub(JSContext *cx, JSObject *obj, jsval id, jsval *vp); extern JS_PUBLIC_API(JSBool) JS_EnumerateStub(JSContext *cx, JSObject *obj); extern JS_PUBLIC_API(JSBool) JS_ResolveStub(JSContext *cx, JSObject *obj, jsval 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; JSPropertyOp setter; }; struct JSFunctionSpec { const char *name; JSNative call; uint8 nargs; uint8 flags; uint16 extra; /* number of arg slots for local GC roots */ }; 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_NewObject(JSContext *cx, JSClass *clasp, JSObject *proto, JSObject *parent); extern JS_PUBLIC_API(JSBool) JS_SealObject(JSContext *cx, JSObject *obj, JSBool deep); 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_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, JSPropertyOp 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_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, JSPropertyOp *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, JSPropertyOp setter, uintN attrs); extern JS_PUBLIC_API(JSBool) JS_AliasProperty(JSContext *cx, JSObject *obj, const char *name, const char *alias); extern JS_PUBLIC_API(JSBool) JS_HasProperty(JSContext *cx, JSObject *obj, const char *name, JSBool *foundp); extern JS_PUBLIC_API(JSBool) JS_LookupProperty(JSContext *cx, JSObject *obj, const char *name, 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_GetProperty(JSContext *cx, JSObject *obj, const char *name, 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_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_DefineUCProperty(JSContext *cx, JSObject *obj, const jschar *name, size_t namelen, jsval value, JSPropertyOp getter, JSPropertyOp 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, JSPropertyOp *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, JSPropertyOp setter, uintN attrs); 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_HasArrayLength(JSContext *cx, JSObject *obj, jsuint *lengthp); extern JS_PUBLIC_API(JSBool) JS_DefineElement(JSContext *cx, JSObject *obj, jsint index, jsval value, JSPropertyOp getter, JSPropertyOp setter, uintN attrs); extern JS_PUBLIC_API(JSBool) JS_AliasElement(JSContext *cx, JSObject *obj, const char *name, jsint alias); extern JS_PUBLIC_API(JSBool) JS_HasElement(JSContext *cx, JSObject *obj, jsint index, JSBool *foundp); extern JS_PUBLIC_API(JSBool) JS_LookupElement(JSContext *cx, JSObject *obj, jsint index, jsval *vp); extern JS_PUBLIC_API(JSBool) JS_GetElement(JSContext *cx, JSObject *obj, jsint index, jsval *vp); extern JS_PUBLIC_API(JSBool) JS_SetElement(JSContext *cx, JSObject *obj, jsint index, jsval *vp); extern JS_PUBLIC_API(JSBool) JS_DeleteElement(JSContext *cx, JSObject *obj, jsint index); extern JS_PUBLIC_API(JSBool) JS_DeleteElement2(JSContext *cx, JSObject *obj, jsint 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 JSVAL_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(JSCheckAccessOp) JS_SetCheckObjectAccessCallback(JSRuntime *rt, JSCheckAccessOp acb); 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 * (* JS_DLL_CALLBACK getPrincipalArray)(JSContext *cx, JSPrincipals *); JSBool (* JS_DLL_CALLBACK globalPrivilegesEnabled)(JSContext *cx, JSPrincipals *); /* Don't call "destroy"; use reference counting macros below. */ jsrefcount refcount; void (* JS_DLL_CALLBACK destroy)(JSContext *cx, JSPrincipals *); JSBool (* JS_DLL_CALLBACK 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 extern JS_PUBLIC_API(JSPrincipalsTranscoder) JS_SetPrincipalsTranscoder(JSRuntime *rt, JSPrincipalsTranscoder px); extern JS_PUBLIC_API(JSObjectPrincipalsFinder) JS_SetObjectPrincipalsFinder(JSRuntime *rt, JSObjectPrincipalsFinder fop); /************************************************************************/ /* * Functions and scripts. */ extern JS_PUBLIC_API(JSFunction *) JS_NewFunction(JSContext *cx, JSNative call, uintN nargs, uintN flags, JSObject *parent, const char *name); extern JS_PUBLIC_API(JSObject *) JS_GetFunctionObject(JSFunction *fun); /* * Deprecated, useful only for diagnostics. Use JS_GetFunctionId instead for * anonymous vs. "anonymous" disambiguation and Unicode fidelity. */ extern JS_PUBLIC_API(const char *) JS_GetFunctionName(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. * * Prefer JS_GetFunctionId over JS_GetFunctionName because it returns null for * truly anonymous functions, and because it doesn't chop to ISO-Latin-1 chars * from UTF-16-ish jschars. */ extern JS_PUBLIC_API(JSString *) JS_GetFunctionId(JSFunction *fun); /* * Return JSFUN_* flags for fun. */ extern JS_PUBLIC_API(uintN) JS_GetFunctionFlags(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_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(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, JSObject *obj, const char *bytes, size_t length); /* * The JSScript objects returned by the following functions refer to string and * other kinds of literals, including doubles and RegExp objects. These * literals are vulnerable to garbage collection; to root script objects and * prevent literals from being collected, create a rootable object using * JS_NewScriptObject, and root the resulting object using JS_Add[Named]Root. */ extern JS_PUBLIC_API(JSScript *) JS_CompileScript(JSContext *cx, JSObject *obj, const char *bytes, size_t length, const char *filename, uintN lineno); extern JS_PUBLIC_API(JSScript *) JS_CompileScriptForPrincipals(JSContext *cx, JSObject *obj, JSPrincipals *principals, const char *bytes, size_t length, const char *filename, uintN lineno); extern JS_PUBLIC_API(JSScript *) JS_CompileUCScript(JSContext *cx, JSObject *obj, const jschar *chars, size_t length, const char *filename, uintN lineno); extern JS_PUBLIC_API(JSScript *) JS_CompileUCScriptForPrincipals(JSContext *cx, JSObject *obj, JSPrincipals *principals, const jschar *chars, size_t length, const char *filename, uintN lineno); extern JS_PUBLIC_API(JSScript *) JS_CompileFile(JSContext *cx, JSObject *obj, const char *filename); extern JS_PUBLIC_API(JSScript *) JS_CompileFileHandle(JSContext *cx, JSObject *obj, const char *filename, FILE *fh); extern JS_PUBLIC_API(JSScript *) JS_CompileFileHandleForPrincipals(JSContext *cx, JSObject *obj, const char *filename, FILE *fh, JSPrincipals *principals); /* * NB: you must use JS_NewScriptObject and root a pointer to its return value * in order to keep a JSScript and its atoms safe from garbage collection after * creating the script via JS_Compile* and before a JS_ExecuteScript* call. * E.g., and without error checks: * * JSScript *script = JS_CompileFile(cx, global, filename); * JSObject *scrobj = JS_NewScriptObject(cx, script); * JS_AddNamedRoot(cx, &scrobj, "scrobj"); * do { * jsval result; * JS_ExecuteScript(cx, global, script, &result); * JS_GC(); * } while (!JSVAL_IS_BOOLEAN(result) || JSVAL_TO_BOOLEAN(result)); * JS_RemoveRoot(cx, &scrobj); */ extern JS_PUBLIC_API(JSObject *) JS_NewScriptObject(JSContext *cx, JSScript *script); /* * Infallible getter for a script's object. If JS_NewScriptObject has not been * called on script yet, the return value will be null. */ extern JS_PUBLIC_API(JSObject *) JS_GetScriptObject(JSScript *script); extern JS_PUBLIC_API(void) JS_DestroyScript(JSContext *cx, JSScript *script); 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(JSString *) JS_DecompileScript(JSContext *cx, JSScript *script, 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, JS_ExecuteScriptPart, and the JS_Evaluate*Script* * quadruplets all 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, JSScript *script, jsval *rval); /* * 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_ExecuteScriptPart(JSContext *cx, JSObject *obj, JSScript *script, JSExecPart part, jsval *rval); 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_EvaluateUCScript(JSContext *cx, JSObject *obj, const jschar *chars, uintN length, const char *filename, uintN lineno, jsval *rval); 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); extern JS_PUBLIC_API(JSBranchCallback) JS_SetBranchCallback(JSContext *cx, JSBranchCallback cb); extern JS_PUBLIC_API(JSBool) JS_IsRunning(JSContext *cx); extern JS_PUBLIC_API(JSBool) JS_IsConstructing(JSContext *cx); /* * Returns true if a script is executing and its current bytecode is a set * (assignment) operation, even if there are native (no script) stack frames * between the script and the caller to JS_IsAssigning. */ extern JS_FRIEND_API(JSBool) JS_IsAssigning(JSContext *cx); /* * Set the second return value, which should be a string or int jsval that * identifies a property in the returned object, to form an ECMA reference * type value (obj, id). Only native methods can return reference types, * and if the returned value is used on the left-hand side of an assignment * op, the identified property will be set. If the return value is in an * r-value, the interpreter just gets obj[id]'s value. */ extern JS_PUBLIC_API(void) JS_SetCallReturnValue2(JSContext *cx, jsval v); /************************************************************************/ /* * Strings. * * NB: JS_NewString takes ownership of bytes on success, avoiding a copy; but * on error (signified by null return), it leaves bytes 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_NewString(JSContext *cx, char *bytes, size_t length); 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_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(char *) JS_GetStringBytes(JSString *str); extern JS_PUBLIC_API(jschar *) JS_GetStringChars(JSString *str); extern JS_PUBLIC_API(size_t) JS_GetStringLength(JSString *str); extern JS_PUBLIC_API(intN) JS_CompareStrings(JSString *str1, JSString *str2); /* * Mutable string support. A string's characters are never mutable in this JS * implementation, but a growable string has a buffer that can be reallocated, * and a dependent string is a substring of another (growable, dependent, or * immutable) string. The direct data members of the (opaque to API clients) * JSString struct may be changed in a single-threaded way for growable and * dependent strings. * * Therefore mutable strings cannot be used by more than one thread at a time. * You may call JS_MakeStringImmutable to convert the string from a mutable * (growable or dependent) string to an immutable (and therefore thread-safe) * string. The engine takes care of converting growable 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. */ extern JS_PUBLIC_API(JSString *) JS_NewGrowableString(JSContext *cx, jschar *chars, size_t length); /* * 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, resulting in a new growable string. If you create * the left string and pass it to JS_ConcatStrings on a single thread, try to * use JS_NewGrowableString to create the left string -- doing so helps Concat * avoid allocating a new buffer for the result and copying left's chars into * the new buffer. 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 growable or dependent) into an immutable, * thread-safe one. */ extern JS_PUBLIC_API(JSBool) JS_MakeStringImmutable(JSContext *cx, JSString *str); /************************************************************************/ /* * Locale specific string conversion callback. */ struct JSLocaleCallbacks { JSLocaleToUpperCase localeToUpperCase; JSLocaleToLowerCase localeToLowerCase; JSLocaleCompare localeCompare; JSLocaleToUnicode localeToUnicode; }; /* * 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); 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 */ /* * 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) extern JS_PUBLIC_API(JSErrorReporter) JS_SetErrorReporter(JSContext *cx, JSErrorReporter er); /************************************************************************/ /* * 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 */ extern JS_PUBLIC_API(JSObject *) JS_NewRegExpObject(JSContext *cx, char *bytes, size_t length, uintN flags); extern JS_PUBLIC_API(JSObject *) JS_NewUCRegExpObject(JSContext *cx, jschar *chars, size_t length, uintN flags); extern JS_PUBLIC_API(void) JS_SetRegExpInput(JSContext *cx, JSString *input, JSBool multiline); extern JS_PUBLIC_API(void) JS_ClearRegExpStatics(JSContext *cx); extern JS_PUBLIC_API(void) JS_ClearRegExpRoots(JSContext *cx); /* TODO: compile, exec, get/set other statics... */ /************************************************************************/ 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); #ifdef JS_THREADSAFE /* * 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); #endif /* JS_THREADSAFE */ /************************************************************************/ JS_END_EXTERN_C #endif /* jsapi_h___ */