LCOV - code coverage report
Current view: directory - js/src/vm - Xdr.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 71 50 70.4 %
Date: 2012-04-07 Functions: 5 5 100.0 %

       1                 : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
       2                 :  *
       3                 :  * ***** BEGIN LICENSE BLOCK *****
       4                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       5                 :  *
       6                 :  * The contents of this file are subject to the Mozilla Public License Version
       7                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       8                 :  * the License. You may obtain a copy of the License at
       9                 :  * http://www.mozilla.org/MPL/
      10                 :  *
      11                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      12                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      13                 :  * for the specific language governing rights and limitations under the
      14                 :  * License.
      15                 :  *
      16                 :  * The Original Code is Mozilla Communicator client code, released
      17                 :  * March 31, 1998.
      18                 :  *
      19                 :  * The Initial Developer of the Original Code is
      20                 :  * Netscape Communications Corporation.
      21                 :  * Portions created by the Initial Developer are Copyright (C) 1998
      22                 :  * the Initial Developer. All Rights Reserved.
      23                 :  *
      24                 :  * Contributor(s):
      25                 :  *
      26                 :  * Alternatively, the contents of this file may be used under the terms of
      27                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      28                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      29                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      30                 :  * of those above. If you wish to allow use of your version of this file only
      31                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      32                 :  * use your version of this file under the terms of the MPL, indicate your
      33                 :  * decision by deleting the provisions above and replace them with the notice
      34                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      35                 :  * the provisions above, a recipient may use your version of this file under
      36                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      37                 :  *
      38                 :  * ***** END LICENSE BLOCK ***** */
      39                 : 
      40                 : #include "mozilla/Util.h"
      41                 : 
      42                 : #include "jsversion.h"
      43                 : 
      44                 : #include <string.h>
      45                 : #include "jstypes.h"
      46                 : #include "jsutil.h"
      47                 : #include "jsdhash.h"
      48                 : #include "jsprf.h"
      49                 : #include "jsapi.h"
      50                 : #include "jscntxt.h"
      51                 : #include "jsnum.h"
      52                 : #include "jsscript.h"
      53                 : #include "jsstr.h"
      54                 : 
      55                 : #include "Xdr.h"
      56                 : #include "Debugger.h"
      57                 : 
      58                 : #include "jsobjinlines.h"
      59                 : 
      60                 : using namespace mozilla;
      61                 : using namespace js;
      62                 : 
      63                 : namespace js {
      64                 : 
      65                 : void
      66            2390 : XDRBuffer::freeBuffer()
      67                 : {
      68            2390 :     Foreground::free_(base);
      69                 : #ifdef DEBUG
      70            2390 :     memset(this, 0xe2, sizeof *this);
      71                 : #endif
      72            2390 : }
      73                 : 
      74                 : bool
      75            2390 : XDRBuffer::grow(size_t n)
      76                 : {
      77            2390 :     JS_ASSERT(n > size_t(limit - cursor));
      78                 :     
      79            2390 :     const size_t MEM_BLOCK = 8192;
      80            2390 :     size_t offset = cursor - base;
      81            2390 :     size_t newCapacity = JS_ROUNDUP(offset + n, MEM_BLOCK);
      82            2390 :     if (isUint32Overflow(newCapacity)) {
      83               0 :         JS_ReportErrorNumber(cx(), js_GetErrorMessage, NULL, JSMSG_TOO_BIG_TO_ENCODE);
      84               0 :         return false;
      85                 :     }
      86                 :         
      87            2390 :     void *data = OffTheBooks::realloc_(base, newCapacity);
      88            2390 :     if (!data) {
      89               0 :         js_ReportOutOfMemory(cx());
      90               0 :         return false;
      91                 :     }
      92            2390 :     base = static_cast<uint8_t *>(data);
      93            2390 :     cursor = base + offset;
      94            2390 :     limit = base + newCapacity;
      95            2390 :     return true;
      96                 : }
      97                 :     
      98                 : template<XDRMode mode>
      99                 : bool
     100                 : XDRState<mode>::codeChars(jschar *chars, size_t nchars)
     101                 : {
     102            7871 :     size_t nbytes = nchars * sizeof(jschar);
     103                 :     if (mode == XDR_ENCODE) {
     104            7871 :         uint8_t *ptr = buf.write(nbytes);
     105            7871 :         if (!ptr)
     106               0 :             return false;
     107                 : #ifdef IS_LITTLE_ENDIAN
     108            7871 :         memcpy(ptr, chars, nbytes);
     109                 : #else
     110                 :         for (size_t i = 0; i != nchars; i++) {
     111                 :             uint16_t tmp = NormalizeByteOrder16(chars[i]);
     112                 :             memcpy(ptr, &tmp, sizeof tmp);
     113                 :             ptr += sizeof tmp;
     114                 :         }
     115                 : #endif
     116                 :     } else {
     117               0 :         const uint8_t *ptr = buf.read(nbytes);
     118                 : #ifdef IS_LITTLE_ENDIAN
     119               0 :         memcpy(chars, ptr, nbytes);
     120                 : #else
     121                 :         for (size_t i = 0; i != nchars; i++) {
     122                 :             uint16_t tmp;
     123                 :             memcpy(&tmp, ptr, sizeof tmp);
     124                 :             chars[i] = NormalizeByteOrder16(tmp);
     125                 :             ptr += sizeof tmp;
     126                 :         }
     127                 : #endif
     128                 :     }
     129            7871 :     return true;
     130                 : }
     131                 : 
     132                 : /*
     133                 :  * Convert between a JS (Unicode) string and the XDR representation.
     134                 :  */
     135                 : template<XDRMode mode>
     136                 : bool
     137                 : XDRState<mode>::codeString(JSString **strp)
     138                 : {
     139                 :     uint32_t nchars;
     140                 :     jschar *chars;
     141                 : 
     142                 :     if (mode == XDR_ENCODE)
     143            7871 :         nchars = (*strp)->length();
     144            7871 :     if (!codeUint32(&nchars))
     145               0 :         return false;
     146                 : 
     147                 :     if (mode == XDR_DECODE)
     148               0 :         chars = (jschar *) cx()->malloc_((nchars + 1) * sizeof(jschar));
     149                 :     else
     150            7871 :         chars = const_cast<jschar *>((*strp)->getChars(cx()));
     151            7871 :     if (!chars)
     152               0 :         return false;
     153                 : 
     154            7871 :     if (!codeChars(chars, nchars))
     155               0 :         goto bad;
     156                 :     if (mode == XDR_DECODE) {
     157               0 :         chars[nchars] = 0;
     158               0 :         *strp = JS_NewUCString(cx(), chars, nchars);
     159               0 :         if (!*strp)
     160               0 :             goto bad;
     161                 :     }
     162            7871 :     return true;
     163                 : 
     164                 : bad:
     165                 :     if (mode == XDR_DECODE)
     166               0 :         Foreground::free_(chars);
     167               0 :     return false;
     168                 : }
     169                 : 
     170                 : template<XDRMode mode>
     171                 : static bool
     172              42 : VersionCheck(XDRState<mode> *xdr)
     173                 : {
     174                 :     uint32_t bytecodeVer;
     175                 :     if (mode == XDR_ENCODE)
     176              21 :         bytecodeVer = XDR_BYTECODE_VERSION;
     177                 : 
     178              42 :     if (!xdr->codeUint32(&bytecodeVer))
     179               0 :         return false;
     180                 : 
     181              21 :     if (mode == XDR_DECODE && bytecodeVer != XDR_BYTECODE_VERSION) {
     182                 :         /* We do not provide binary compatibility with older scripts. */
     183               0 :         JS_ReportErrorNumber(xdr->cx(), js_GetErrorMessage, NULL, JSMSG_BAD_SCRIPT_MAGIC);
     184               0 :         return false;
     185                 :     }
     186                 : 
     187              42 :     return true;
     188                 : }
     189                 : 
     190                 : template<XDRMode mode>
     191                 : bool
     192                 : XDRState<mode>::codeFunction(JSObject **objp)
     193                 : {
     194                 :     if (mode == XDR_DECODE)
     195               6 :         *objp = NULL;
     196                 :         
     197              12 :     return VersionCheck(this) && XDRInterpretedFunction(this, objp, NULL);
     198                 : }
     199                 : 
     200                 : template<XDRMode mode>
     201                 : bool
     202                 : XDRState<mode>::codeScript(JSScript **scriptp)
     203                 : {
     204                 :     JSScript *script;
     205                 :     if (mode == XDR_DECODE) {
     206              15 :         script = NULL;
     207              15 :         *scriptp = NULL;
     208                 :     } else {
     209              15 :         script = *scriptp;
     210                 :     }
     211                 : 
     212              30 :     if (!VersionCheck(this) || !XDRScript(this, &script, NULL))
     213               0 :         return false;
     214                 : 
     215                 :     if (mode == XDR_DECODE) {
     216              15 :         JS_ASSERT(!script->compileAndGo);
     217              15 :         script->globalObject = GetCurrentGlobal(cx());
     218              15 :         js_CallNewScriptHook(cx(), script, NULL);
     219              15 :         Debugger::onNewScript(cx(), script, NULL);
     220              15 :         *scriptp = script;
     221                 :     }
     222                 : 
     223              30 :     return true;
     224                 : }
     225                 : 
     226            2390 : XDRDecoder::XDRDecoder(JSContext *cx, const void *data, uint32_t length,
     227                 :                        JSPrincipals *principals, JSPrincipals *originPrincipals)
     228            2390 :   : XDRState<XDR_DECODE>(cx)
     229                 : {
     230            2390 :     buf.setData(data, length);
     231            2390 :     this->principals = principals;
     232            2390 :     this->originPrincipals = JSScript::normalizeOriginPrincipals(principals, originPrincipals);
     233            2390 : }
     234                 : 
     235                 : template class XDRState<XDR_ENCODE>;
     236                 : template class XDRState<XDR_DECODE>;
     237                 : 
     238                 : } /* namespace js */
     239                 : 

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