hphp/util/alloc-defs.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 #pragma once
  17
  18 #include <cstddef>
  19
  20 #include <folly/CPortability.h>
  21 #include "hphp/util/low-ptr-def.h"
  22
  23 #if FOLLY_SANITIZE
  24 // ASan is less precise than valgrind so we'll need a superset of those tweaks
  25 #  define VALGRIND
  26 // TODO: (t2869817) ASan doesn't play well with jemalloc
  27 #  ifdef USE_JEMALLOC
  28 #    undef USE_JEMALLOC
  29 #  endif
  30 #endif
  31
  32 #ifdef USE_JEMALLOC
  33 #include <jemalloc/jemalloc.h>
  34 #if (JEMALLOC_VERSION_MAJOR < 5)
  35 #  error "jemalloc 5 is required"
  36 #endif
  37 #if defined(USE_LOWPTR) && defined(__linux__) \
  38   && !defined(USE_JEMALLOC_EXTENT_HOOKS)
  39 #  define USE_JEMALLOC_EXTENT_HOOKS 1
  40 #endif
  41 #endif
  42
  43 namespace HPHP {
  44 constexpr bool use_jemalloc =
  45 #ifdef USE_JEMALLOC
  46   true
  47 #else
  48   false
  49 #endif
  50   ;
  51
  52 // When we have control over the virtual address space for the heap, all
  53 // static/uncounted strings/arrays have addresses lower than kUncountedMaxAddr,
  54 // and all counted HeapObjects have higher addresses.
  55 constexpr bool addr_encodes_persistency =
  56 #if USE_JEMALLOC_EXTENT_HOOKS && defined(__x86_64__) && defined(__linux__)
  57   true
  58 #else
  59   false
  60 #endif
  61   ;
  62
  63 // ASAN modifies the generated code in ways that cause abnormally high C++
  64 // stack usage.
  65 constexpr size_t kStackSizeMinimum =
  66 #if FOLLY_SANITIZE
  67   16 << 20;
  68 #else
  69   8 << 20;
  70 #endif
  71
  72 extern const size_t s_pageSize;
  73
  74 }
  75