/* -*- 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

/*
 * 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)
#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)     (((v) & ~((jsval)1 << JSVAL_TAGBITS)) ==      \
                                 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_TAG(v) != JSVAL_BOOLEAN)
#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_INT_POW2(30))
#define JSVAL_INT_MAX           (JSVAL_INT_POW2(30) - 1)
#define INT_FITS_IN_JSVAL(i)    ((jsuint)(i) - (jsuint)JSVAL_INT_MIN <=      \
                                 (jsuint)(JSVAL_INT_MAX - JSVAL_INT_MIN))
#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_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_DISJOINT_FLAGS(f) ((f) & 0x0f)
#define JSFUN_GSFLAGS(f)        ((f) & (JSFUN_GETTER | JSFUN_SETTER))

#define JSFUN_GETTER_TEST(f)       ((f) & JSFUN_GETTER)
#define JSFUN_SETTER_TEST(f)       ((f) & JSFUN_SETTER)
#define JSFUN_BOUND_METHOD_TEST(f) ((f) & JSFUN_BOUND_METHOD)
#define JSFUN_HEAVYWEIGHT_TEST(f)  ((f) & JSFUN_HEAVYWEIGHT)

#define JSFUN_GSFLAG2ATTR(f)       JSFUN_GSFLAGS(f)

#define JSFUN_THISP_FLAGS(f)  (f)
#define JSFUN_THISP_TEST(f,t) ((f) & t)

#define JSFUN_THISP_STRING    0x0100    /* |this| may be a primitive string */
#define JSFUN_THISP_NUMBER    0x0200    /* |this| may be a primitive number */
#define JSFUN_THISP_BOOLEAN   0x0400    /* |this| may be a primitive boolean */
#define JSFUN_THISP_PRIMITIVE 0x0700    /* |this| may be any primitive value */

#define JSFUN_FAST_NATIVE     0x0800    /* JSFastNative needs no JSStackFrame */

#define JSFUN_FLAGS_MASK      0x0ff8    /* overlay JSFUN_* attributes --
                                           note that bit #15 is 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

/*
 * Well-known JS values.  The extern'd variables are initialized when the
 * first JSContext is created by JS_NewContext (see below).
 */
#define JSVAL_VOID              BOOLEAN_TO_JSVAL(2)
#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(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);

/*
 * 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(JSString *)
JS_ValueToSource(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.
 *
 * 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);

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);

#ifdef __cplusplus
JS_END_EXTERN_C

class JSAutoRequest {
  public:
    JSAutoRequest(JSContext *cx) : mContext(cx), mSaveDepth(0) {
        JS_BeginRequest(mContext);
    }
    ~JSAutoRequest() {
        JS_EndRequest(mContext);
    }

    void suspend() {
        mSaveDepth = JS_SuspendRequest(mContext);
    }
    void resume() {
        JS_ResumeRequest(mContext, mSaveDepth);
    }

  protected:
    JSContext *mContext;
    jsrefcount mSaveDepth;

#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) : mContext(cx), mSaveDepth(0) {
        if (mContext) {
            mSaveDepth = JS_SuspendRequest(mContext);
        }
    }
    ~JSAutoSuspendRequest() {
        resume();
    }

    void resume() {
        if (mContext) {
            JS_ResumeRequest(mContext, mSaveDepth);
            mContext = 0;
        }
    }

  protected:
    JSContext *mContext;
    jsrefcount mSaveDepth;

#if 0
  private:
    static void *operator new(size_t) CPP_THROW_NEW { return 0; };
    static void operator delete(void *, size_t) { };
#endif
};

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_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.
                                                   Deprecated, use
                                                   JS_SetOperationCallback
                                                   instead */
#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 */
#define JSOPTION_ANONFUNFIX     JS_BIT(10)      /* Disallow function () {} in
                                                   statement context per
                                                   ECMA-262 Edition 3. */

#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. */

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(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);

/*
 * 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.
 */
#define JS_CALLEE(cx,vp)        ((vp)[0])
#define JS_ARGV_CALLEE(argv)    ((argv)[-2])
#define JS_THIS(cx,vp)          JS_ComputeThis(cx, vp)
#define JS_THIS_OBJECT(cx,vp)   ((JSObject *) 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);

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.
 *
 * JS_LeaveLocalRootScopeWithResult(cx, rval) is an alternative way to leave
 * a local root scope that protects a result or return value, by effectively
 * pushing it in the caller's local root scope.
 *
 * 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_LeaveLocalRootScopeWithResult(JSContext *cx, jsval rval);

extern JS_PUBLIC_API(void)
JS_ForgetLocalRoot(JSContext *cx, void *thing);

#ifdef __cplusplus
JS_END_EXTERN_C

class JSAutoLocalRootScope {
  public:
    JSAutoLocalRootScope(JSContext *cx) : mContext(cx) {
        JS_EnterLocalRootScope(mContext);
    }
    ~JSAutoLocalRootScope() {
        JS_LeaveLocalRootScope(mContext);
    }

    void forget(void *thing) {
        JS_ForgetLocalRoot(mContext, thing);
    }

  protected:
    JSContext *mContext;

#if 0
  private:
    static void *operator new(size_t) CPP_THROW_NEW { return 0; };
    static void operator delete(void *, size_t) { };
#endif
};

JS_BEGIN_EXTERN_C
#endif

#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
(* 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);

/*
 * 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);

/*
 * For implementors of JSMarkOp. All new code should implement JSTraceOp
 * instead.
 */
extern JS_PUBLIC_API(void)
JS_MarkGCThing(JSContext *cx, void *thing, const char *name, void *arg);

/*
 * 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.
 *
 * By definition references to traceable things include non-null pointers
 * to JSObject, JSString and jsdouble and corresponding jsvals.
 *
 * See the JSTraceOp typedef in jspubtd.h.
 */

/* Trace kinds to pass to JS_Tracing. */
#define JSTRACE_OBJECT  0
#define JSTRACE_DOUBLE  1
#define JSTRACE_STRING  2

/*
 * 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.
 */
#define JSVAL_IS_TRACEABLE(v)   (JSVAL_IS_GCTHING(v) && !JSVAL_IS_NULL(v))
#define JSVAL_TO_TRACEABLE(v)   (JSVAL_TO_GCTHING(v))
#define JSVAL_TRACE_KIND(v)     (JSVAL_TAG(v) >> 1)

JS_STATIC_ASSERT(JSVAL_TRACE_KIND(JSVAL_OBJECT) == JSTRACE_OBJECT);
JS_STATIC_ASSERT(JSVAL_TRACE_KIND(JSVAL_DOUBLE) == JSTRACE_DOUBLE);
JS_STATIC_ASSERT(JSVAL_TRACE_KIND(JSVAL_STRING) == JSTRACE_STRING);

struct JSTracer {
    JSContext           *context;
    JSTraceCallback     callback;
#ifdef DEBUG
    JSTraceNamePrinter  debugPrinter;
    const void          *debugPrintArg;
    size_t              debugPrintIndex;
#endif
};

/*
 * 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, uint32 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 debugPrinterArg 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

#define JS_CALL_DOUBLE_TRACER(trc, number, name)                              \
    JS_BEGIN_MACRO                                                            \
        jsdouble *num_ = (number);                                            \
        JS_ASSERT(num_);                                                      \
        JS_CALL_TRACER((trc), num_, JSTRACE_DOUBLE, name);                    \
    JS_END_MACRO

/*
 * API for JSTraceCallback implementations.
 */
# define JS_TRACER_INIT(trc, cx_, callback_)                                  \
    JS_BEGIN_MACRO                                                            \
        (trc)->context = (cx_);                                               \
        (trc)->callback = (callback_);                                        \
        JS_SET_TRACING_DETAILS(trc, NULL, NULL, (size_t)-1);                  \
    JS_END_MACRO

extern JS_PUBLIC_API(void)
JS_TraceChildren(JSTracer *trc, void *thing, uint32 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, uint32 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 0 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, uint32 startKind,
            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_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
} 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);

/*
 * Set the quota on the number of bytes that stack-like data structures can
 * use when the runtime compiles and executes scripts. These structures
 * consume heap space, so JS_SetThreadStackLimit does not bound their size.
 * The default quota is 32MB which is quite generous.
 *
 * The function must be called before any script compilation or execution API
 * calls, i.e. either immediately after JS_NewContext or from JSCONTEXT_NEW
 * context callback.
 */
extern JS_PUBLIC_API(void)
JS_SetScriptStackQuota(JSContext *cx, size_t quota);

#define JS_DEFAULT_SCRIPT_STACK_QUOTA   ((size_t) 0x2000000)

/************************************************************************/

/*
 * 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;
    JSIteratorOp        iteratorObject;
    JSObjectOp          wrappedObject;          /* NB: infallible, null
                                                   returns are treated as
                                                   the original object */
    void                (*reserved0)(void);
    void                (*reserved1)(void);
    void                (*reserved2)(void);
};

#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…