hphp/runtime/vm/jit/func-guard-x64.h

   1 /*
   2    +----------------------------------------------------------------------+
   3    | HipHop for PHP                                                       |
   4    +----------------------------------------------------------------------+
   5    | Copyright (c) 2010-present Facebook, Inc. (http://www.facebook.com)  |
   6    +----------------------------------------------------------------------+
   7    | This source file is subject to version 3.01 of the PHP license,      |
   8    | that is bundled with this package in the file LICENSE, and is        |
   9    | available through the world-wide-web at the following url:           |
  10    | http://www.php.net/license/3_01.txt                                  |
  11    | If you did not receive a copy of the PHP license and are unable to   |
  12    | obtain it through the world-wide-web, please send a note to          |
  13    | license@php.net so we can mail you a copy immediately.               |
  14    +----------------------------------------------------------------------+
  15 */
  16
  17 #ifndef incl_HPHP_JIT_FUNC_GUARD_X64_H
  18 #define incl_HPHP_JIT_FUNC_GUARD_X64_H
  19
  20 #include "hphp/runtime/vm/jit/types.h"
  21
  22 #include "hphp/util/data-block.h"
  23
  24 namespace HPHP {
  25
  26 struct Func;
  27
  28 namespace jit {
  29
  30 struct CGMeta;
  31
  32 namespace x64 {
  33
  34 ///////////////////////////////////////////////////////////////////////////////
  35
  36 /*
  37  * Mirrors the API of func-guard.h.
  38  */
  39
  40 // No instructions are enforced to be continuous on x86.
  41 constexpr size_t funcGuardLen() { return 0; }
  42
  43 void emitFuncGuard(const Func* func, CodeBlock& cb, CGMeta& fixups);
  44 TCA funcGuardFromPrologue(TCA prologue, const Func* func);
  45 bool funcGuardMatches(TCA guard, const Func* func);
  46 void clobberFuncGuard(TCA guard, const Func* func);
  47
  48 ///////////////////////////////////////////////////////////////////////////////
  49
  50 }}}
  51
  52 #endif