jsapi.c

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/* -*- 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 ***** */

/*
 * JavaScript API.
 */
#include "jsstddef.h"
#include <ctype.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include "jstypes.h"
#include "jsarena.h" /* Added by JSIFY */
#include "jsutil.h" /* Added by JSIFY */
#include "jsclist.h"
#include "jsdhash.h"
#include "jsprf.h"
#include "jsapi.h"
#include "jsarray.h"
#include "jsatom.h"
#include "jsbool.h"
#include "jscntxt.h"
#include "jsconfig.h"
#include "jsdate.h"
#include "jsdtoa.h"
#include "jsemit.h"
#include "jsexn.h"
#include "jsfun.h"
#include "jsgc.h"
#include "jsinterp.h"
#include "jslock.h"
#include "jsmath.h"
#include "jsnum.h"
#include "jsobj.h"
#include "jsopcode.h"
#include "jsparse.h"
#include "jsregexp.h"
#include "jsscan.h"
#include "jsscope.h"
#include "jsscript.h"
#include "jsstr.h"
#include "prmjtime.h"

#if JS_HAS_FILE_OBJECT
#include "jsfile.h"
#endif

#ifdef HAVE_VA_LIST_AS_ARRAY
#define JS_ADDRESSOF_VA_LIST(ap) (ap)
#else
#define JS_ADDRESSOF_VA_LIST(ap) (&(ap))
#endif

#if defined(JS_PARANOID_REQUEST) && defined(JS_THREADSAFE)
#define CHECK_REQUEST(cx)       JS_ASSERT(cx->requestDepth)
#else
#define CHECK_REQUEST(cx)       ((void)0)
#endif

JS_PUBLIC_API(int64)
JS_Now()
{
    return PRMJ_Now();
}

JS_PUBLIC_API(jsval)
JS_GetNaNValue(JSContext *cx)
{
    return DOUBLE_TO_JSVAL(cx->runtime->jsNaN);
}

JS_PUBLIC_API(jsval)
JS_GetNegativeInfinityValue(JSContext *cx)
{
    return DOUBLE_TO_JSVAL(cx->runtime->jsNegativeInfinity);
}

JS_PUBLIC_API(jsval)
JS_GetPositiveInfinityValue(JSContext *cx)
{
    return DOUBLE_TO_JSVAL(cx->runtime->jsPositiveInfinity);
}

JS_PUBLIC_API(jsval)
JS_GetEmptyStringValue(JSContext *cx)
{
    return STRING_TO_JSVAL(cx->runtime->emptyString);
}

static JSBool
TryArgumentFormatter(JSContext *cx, const char **formatp, JSBool fromJS,
                     jsval **vpp, va_list *app)
{
    const char *format;
    JSArgumentFormatMap *map;

    format = *formatp;
    for (map = cx->argumentFormatMap; map; map = map->next) {
        if (!strncmp(format, map->format, map->length)) {
            *formatp = format + map->length;
            return map->formatter(cx, format, fromJS, vpp, app);
        }
    }
    JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_BAD_CHAR, format);
    return JS_FALSE;
}

JS_PUBLIC_API(JSBool)
JS_ConvertArguments(JSContext *cx, uintN argc, jsval *argv, const char *format,
                    ...)
{
    va_list ap;
    JSBool ok;

    va_start(ap, format);
    ok = JS_ConvertArgumentsVA(cx, argc, argv, format, ap);
    va_end(ap);
    return ok;
}

JS_PUBLIC_API(JSBool)
JS_ConvertArgumentsVA(JSContext *cx, uintN argc, jsval *argv,
                      const char *format, va_list ap)
{
    jsval *sp;
    JSBool required;
    char c;
    JSFunction *fun;
    jsdouble d;
    JSString *str;
    JSObject *obj;

    CHECK_REQUEST(cx);
    sp = argv;
    required = JS_TRUE;
    while ((c = *format++) != '\0') {
        if (isspace(c))
            continue;
        if (c == '/') {
            required = JS_FALSE;
            continue;
        }
        if (sp == argv + argc) {
            if (required) {
                fun = js_ValueToFunction(cx, &argv[-2], 0);
                if (fun) {
                    char numBuf[12];
                    JS_snprintf(numBuf, sizeof numBuf, "%u", argc);
                    JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
                                         JSMSG_MORE_ARGS_NEEDED,
                                         JS_GetFunctionName(fun), numBuf,
                                         (argc == 1) ? "" : "s");
                }
                return JS_FALSE;
            }
            break;
        }
        switch (c) {
          case 'b':
            if (!js_ValueToBoolean(cx, *sp, va_arg(ap, JSBool *)))
                return JS_FALSE;
            break;
          case 'c':
            if (!js_ValueToUint16(cx, *sp, va_arg(ap, uint16 *)))
                return JS_FALSE;
            break;
          case 'i':
            if (!js_ValueToECMAInt32(cx, *sp, va_arg(ap, int32 *)))
                return JS_FALSE;
            break;
          case 'u':
            if (!js_ValueToECMAUint32(cx, *sp, va_arg(ap, uint32 *)))
                return JS_FALSE;
            break;
          case 'j':
            if (!js_ValueToInt32(cx, *sp, va_arg(ap, int32 *)))
                return JS_FALSE;
            break;
          case 'd':
            if (!js_ValueToNumber(cx, *sp, va_arg(ap, jsdouble *)))
                return JS_FALSE;
            break;
          case 'I':
            if (!js_ValueToNumber(cx, *sp, &d))
                return JS_FALSE;
            *va_arg(ap, jsdouble *) = js_DoubleToInteger(d);
            break;
          case 's':
          case 'S':
          case 'W':
            str = js_ValueToString(cx, *sp);
            if (!str)
                return JS_FALSE;
            *sp = STRING_TO_JSVAL(str);
            if (c == 's')
                *va_arg(ap, char **) = JS_GetStringBytes(str);
            else if (c == 'W')
                *va_arg(ap, jschar **) = JS_GetStringChars(str);
            else
                *va_arg(ap, JSString **) = str;
            break;
          case 'o':
            if (!js_ValueToObject(cx, *sp, &obj))
                return JS_FALSE;
            *sp = OBJECT_TO_JSVAL(obj);
            *va_arg(ap, JSObject **) = obj;
            break;
          case 'f':
            fun = js_ValueToFunction(cx, sp, 0);
            if (!fun)
                return JS_FALSE;
            *sp = OBJECT_TO_JSVAL(fun->object);
            *va_arg(ap, JSFunction **) = fun;
            break;
          case 'v':
            *va_arg(ap, jsval *) = *sp;
            break;
          case '*':
            break;
          default:
            format--;
            if (!TryArgumentFormatter(cx, &format, JS_TRUE, &sp,
                                      JS_ADDRESSOF_VA_LIST(ap))) {
                return JS_FALSE;
            }
            /* NB: the formatter already updated sp, so we continue here. */
            continue;
        }
        sp++;
    }
    return JS_TRUE;
}

JS_PUBLIC_API(jsval *)
JS_PushArguments(JSContext *cx, void **markp, const char *format, ...)
{
    va_list ap;
    jsval *argv;

    va_start(ap, format);
    argv = JS_PushArgumentsVA(cx, markp, format, ap);
    va_end(ap);
    return argv;
}

JS_PUBLIC_API(jsval *)
JS_PushArgumentsVA(JSContext *cx, void **markp, const char *format, va_list ap)
{
    uintN argc;
    jsval *argv, *sp;
    char c;
    const char *cp;
    JSString *str;
    JSFunction *fun;
    JSStackHeader *sh;

    CHECK_REQUEST(cx);
    *markp = NULL;
    argc = 0;
    for (cp = format; (c = *cp) != '\0'; cp++) {
        /*
         * Count non-space non-star characters as individual jsval arguments.
         * This may over-allocate stack, but we'll fix below.
         */
        if (isspace(c) || c == '*')
            continue;
        argc++;
    }
    sp = js_AllocStack(cx, argc, markp);
    if (!sp)
        return NULL;
    argv = sp;
    while ((c = *format++) != '\0') {
        if (isspace(c) || c == '*')
            continue;
        switch (c) {
          case 'b':
            *sp = BOOLEAN_TO_JSVAL((JSBool) va_arg(ap, int));
            break;
          case 'c':
            *sp = INT_TO_JSVAL((uint16) va_arg(ap, unsigned int));
            break;
          case 'i':
          case 'j':
            if (!js_NewNumberValue(cx, (jsdouble) va_arg(ap, int32), sp))
                goto bad;
            break;
          case 'u':
            if (!js_NewNumberValue(cx, (jsdouble) va_arg(ap, uint32), sp))
                goto bad;
            break;
          case 'd':
          case 'I':
            if (!js_NewDoubleValue(cx, va_arg(ap, jsdouble), sp))
                goto bad;
            break;
          case 's':
            str = JS_NewStringCopyZ(cx, va_arg(ap, char *));
            if (!str)
                goto bad;
            *sp = STRING_TO_JSVAL(str);
            break;
          case 'W':
            str = JS_NewUCStringCopyZ(cx, va_arg(ap, jschar *));
            if (!str)
                goto bad;
            *sp = STRING_TO_JSVAL(str);
            break;
          case 'S':
            str = va_arg(ap, JSString *);
            *sp = STRING_TO_JSVAL(str);
            break;
          case 'o':
            *sp = OBJECT_TO_JSVAL(va_arg(ap, JSObject *));
            break;
          case 'f':
            fun = va_arg(ap, JSFunction *);
            *sp = fun ? OBJECT_TO_JSVAL(fun->object) : JSVAL_NULL;
            break;
          case 'v':
            *sp = va_arg(ap, jsval);
            break;
          default:
            format--;
            if (!TryArgumentFormatter(cx, &format, JS_FALSE, &sp,
                                      JS_ADDRESSOF_VA_LIST(ap))) {
                goto bad;
            }
            /* NB: the formatter already updated sp, so we continue here. */
            continue;
        }
        sp++;
    }

    /*
     * We may have overallocated stack due to a multi-character format code
     * handled by a JSArgumentFormatter.  Give back that stack space!
     */
    JS_ASSERT(sp <= argv + argc);
    if (sp < argv + argc) {
        /* Return slots not pushed to the current stack arena. */
        cx->stackPool.current->avail = (jsuword)sp;

        /* Reduce the count of slots the GC will scan in this stack segment. */
        sh = cx->stackHeaders;
        JS_ASSERT(JS_STACK_SEGMENT(sh) + sh->nslots == argv + argc);
        sh->nslots -= argc - (sp - argv);
    }
    return argv;

bad:
    js_FreeStack(cx, *markp);
    return NULL;
}

JS_PUBLIC_API(void)
JS_PopArguments(JSContext *cx, void *mark)
{
    CHECK_REQUEST(cx);
    js_FreeStack(cx, mark);
}

JS_PUBLIC_API(JSBool)
JS_AddArgumentFormatter(JSContext *cx, const char *format,
                        JSArgumentFormatter formatter)
{
    size_t length;
    JSArgumentFormatMap **mpp, *map;

    length = strlen(format);
    mpp = &cx->argumentFormatMap;
    while ((map = *mpp) != NULL) {
        /* Insert before any shorter string to match before prefixes. */
        if (map->length < length)
            break;
        if (map->length == length && !strcmp(map->format, format))
            goto out;
        mpp = &map->next;
    }
    map = (JSArgumentFormatMap *) JS_malloc(cx, sizeof *map);
    if (!map)
        return JS_FALSE;
    map->format = format;
    map->length = length;
    map->next = *mpp;
    *mpp = map;
out:
    map->formatter = formatter;
    return JS_TRUE;
}

JS_PUBLIC_API(void)
JS_RemoveArgumentFormatter(JSContext *cx, const char *format)
{
    size_t length;
    JSArgumentFormatMap **mpp, *map;

    length = strlen(format);
    mpp = &cx->argumentFormatMap;
    while ((map = *mpp) != NULL) {
        if (map->length == length && !strcmp(map->format, format)) {
            *mpp = map->next;
            JS_free(cx, map);
            return;
        }
        mpp = &map->next;
    }
}

JS_PUBLIC_API(JSBool)
JS_ConvertValue(JSContext *cx, jsval v, JSType type, jsval *vp)
{
    JSBool ok, b;
    JSObject *obj;
    JSFunction *fun;
    JSString *str;
    jsdouble d, *dp;

    CHECK_REQUEST(cx);
    switch (type) {
      case JSTYPE_VOID:
        *vp = JSVAL_VOID;
        ok = JS_TRUE;
        break;
      case JSTYPE_OBJECT:
        ok = js_ValueToObject(cx, v, &obj);
        if (ok)
            *vp = OBJECT_TO_JSVAL(obj);
        break;
      case JSTYPE_FUNCTION:
        fun = js_ValueToFunction(cx, &v, JSV2F_SEARCH_STACK);
        ok = (fun != NULL);