hphp/runtime/vm/jit/type-profile.h

   1 /*
   2    +----------------------------------------------------------------------+
   3    | HipHop for PHP                                                       |
   4    +----------------------------------------------------------------------+
   5    | Copyright (c) 2010-2013 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_TYPE_PROFILE_H_
  18 #define incl_HPHP_JIT_TYPE_PROFILE_H_
  19
  20 #include "hphp/runtime/vm/jit/type.h"
  21
  22 #include "hphp/util/type-scan.h"
  23
  24 #include <string>
  25
  26 namespace HPHP { namespace jit {
  27
  28 ///////////////////////////////////////////////////////////////////////////////
  29
  30 /*
  31  * TypeProfile keeps the union of all the types observed during profiling.
  32  */
  33 struct TypeProfile {
  34   std::string toString() const { return type.toString(); }
  35
  36   void report(TypedValue tv) {
  37     type |= typeFromTV(&tv, nullptr);
  38   }
  39
  40   static void reduce(TypeProfile& a, const TypeProfile& b) {
  41     a.type |= b.type;
  42   }
  43
  44   void serialize(ProfDataSerializer& ser) const { type.serialize(ser); }
  45   void deserialize(ProfDataDeserializer& ser) { type = Type::deserialize(ser); }
  46
  47   Type type; // This gets initialized with 0, which is TBottom.
  48   static_assert(Type::Bits::kBottom == 0, "Assuming TBottom is 0");
  49
  50   // In RDS, but can't contain pointers to request-allocated data.
  51   TYPE_SCAN_IGNORE_ALL;
  52 };
  53
  54 ///////////////////////////////////////////////////////////////////////////////
  55
  56 }}
  57
  58 #endif