C++ (Cpp) JSContext::malloc_の例

コード例 #1

ファイル: jsxdrapi.cpp プロジェクト: moussa1/mozilla-central

extern JSBool
js_XDRAtom(JSXDRState *xdr, JSAtom **atomp)
{
    JSString *str;
    uint32 nchars;
    JSAtom *atom;
    JSContext *cx;
    jschar *chars;
    jschar stackChars[256];

    if (xdr->mode == JSXDR_ENCODE) {
        str = *atomp;
        return JS_XDRString(xdr, &str);
    }

    /*
     * Inline JS_XDRString when decoding to avoid JSString allocation
     * for already existing atoms. See bug 321985.
     */
    if (!JS_XDRUint32(xdr, &nchars))
        return JS_FALSE;
    atom = NULL;
    cx = xdr->cx;
    if (nchars <= ArrayLength(stackChars)) {
        chars = stackChars;
    } else {
        /*
         * This is very uncommon. Don't use the tempLifoAlloc arena for this as
         * most allocations here will be bigger than tempLifoAlloc's default
         * chunk size.
         */
        chars = (jschar *) cx->malloc_(nchars * sizeof(jschar));
        if (!chars)
            return JS_FALSE;
    }

    if (XDRChars(xdr, chars, nchars))
        atom = js_AtomizeChars(cx, chars, nchars);
    if (chars != stackChars)
        cx->free_(chars);

    if (!atom)
        return JS_FALSE;
    *atomp = atom;
    return JS_TRUE;
}