hphp/runtime/vm/jit/vasm-info.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_VASM_INFO_H_
  18 #define incl_HPHP_JIT_VASM_INFO_H_
  19
  20 #include "hphp/util/asm-x64.h"
  21 #include "hphp/runtime/vm/jit/vasm-instr.h"
  22
  23 namespace HPHP { namespace jit {
  24
  25 ///////////////////////////////////////////////////////////////////////////////
  26
  27 struct Vreg;
  28 struct Vinstr;
  29
  30 ///////////////////////////////////////////////////////////////////////////////
  31
  32 /*
  33  * Return the sf reg read by inst, or an invalid register if the
  34  * instruction doesn't read an sf.
  35  */
  36 Vreg getSFUseReg(const Vinstr& inst);
  37
  38 /*
  39  * Get a reference to the condition code for inst, which must be known
  40  * to have one (eg by calling getSFUseReg and getting a valid register).
  41  */
  42 ConditionCode& getConditionCode(Vinstr& inst);
  43
  44 /*
  45  * Returns true if the instruction reads or writes memory.
  46  */
  47 bool touchesMemory(Vinstr::Opcode op);
  48
  49 /*
  50  * Returns true if the instruction writes memory.
  51  */
  52 bool writesMemory(Vinstr::Opcode op);
  53 ///////////////////////////////////////////////////////////////////////////////
  54
  55 }}
  56
  57 #endif