hphp/util/abi-cxx.h

   1 /*
   2    +----------------------------------------------------------------------+
   3    | HipHop for PHP                                                       |
   4    +----------------------------------------------------------------------+
   5    | Copyright (c) 2010-2014 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 #ifndef incl_HPHP_UTIL_ABI_CXX_H_
  17 #define incl_HPHP_UTIL_ABI_CXX_H_
  18
  19 #include <inttypes.h>
  20 #include <string>
  21
  22 namespace HPHP {
  23
  24 //////////////////////////////////////////////////////////////////////
  25
  26 /*
  27  * Given a pointer to somewhere in a C++ function, returns that function's name
  28  * or a hex string representation of the address if it can't find the
  29  * function's name. Attempts to demangle C++ function names.
  30  */
  31 std::string getNativeFunctionName(void* codeAddr);
  32
  33 template<typename Ret, typename... Args>
  34 inline std::string getNativeFunctionName(Ret (*ptr)(Args...)) {
  35   return getNativeFunctionName(reinterpret_cast<void*>(ptr));
  36 }
  37
  38 /**
  39  * Get the vtable offset corresponding to a method pointer. NB: only works
  40  * for single inheritance. For no inheritance at all, use
  41  * getMethodPtr. ABI-specific, don't play on or around.
  42  */
  43 template <typename MethodPtr>
  44 int64_t getVTableOffset(MethodPtr meth) {
  45   union {
  46     MethodPtr meth;
  47     int64_t offset;
  48   } u;
  49   u.meth = meth;
  50   return u.offset - 1;
  51 }
  52
  53 template <typename MethodPtr>
  54 union MethodPtrU {
  55   MethodPtr meth;
  56   void* ptr;
  57 };
  58
  59 template <typename MethodPtr>
  60 constexpr void* getMethodPtr(MethodPtr meth) {
  61   return ((MethodPtrU<MethodPtr>*)(&meth))->ptr;
  62 }
  63
  64 //////////////////////////////////////////////////////////////////////
  65
  66 }
  67
  68
  69 #endif