Allocate stacks with guard pages by default

[folly.git] / folly / Portability.h

diff --git a/folly/Portability.h b/folly/Portability.h
index 98caa82c0769e02bc08490353667ba3e4614c846..1b6ce9dbacb050edc43d88e800ea2f2d96f7f1a3 100644 (file)
--- a/folly/Portability.h
+++ b/folly/Portability.h
@@ -17,23 +17,11 @@
 #ifndef FOLLY_PORTABILITY_H_
 #define FOLLY_PORTABILITY_H_
 
-// @nocommit invalidate ccache 20151125 (see #8764509)
-
 #include <string.h>
 
 #include <cstddef>
 
-#ifndef FOLLY_NO_CONFIG
-#include <folly/folly-config.h>
-#endif
-
-#ifdef FOLLY_PLATFORM_CONFIG
-#include FOLLY_PLATFORM_CONFIG
-#endif
-
-#if FOLLY_HAVE_FEATURES_H
-#include <features.h>
-#endif
+#include <folly/portability/Config.h>
 
 #include <folly/CPortability.h>
 
@@ -43,25 +31,16 @@
 
 #if FOLLY_HAVE_SCHED_H
  #include <sched.h>
- #ifndef FOLLY_HAVE_PTHREAD_YIELD
-  #define pthread_yield sched_yield
- #endif
-#endif
-
-#ifndef FOLLY_HAVE_UNALIGNED_READS
-#define FOLLY_HAVE_UNALIGNED_READS 0
 #endif
 
-// A change in folly/MemoryMapping.cpp uses MAP_ANONYMOUS, which is named
-// MAP_ANON on OSX/BSD.
-#if defined(__APPLE__) || defined(__FreeBSD__)
-  #include <sys/mman.h>
-  #ifndef MAP_ANONYMOUS
-    #ifdef MAP_ANON
-      #define MAP_ANONYMOUS MAP_ANON
-    #endif
-  #endif
+// Unaligned loads and stores
+namespace folly {
+#if FOLLY_HAVE_UNALIGNED_ACCESS
+constexpr bool kHasUnalignedAccess = true;
+#else
+constexpr bool kHasUnalignedAccess = false;
 #endif
+}
 
 // compiler specific attribute translation
 // msvc should come first, so if clang is in msvc mode it gets the right defines
@@ -100,15 +79,6 @@
 # define FOLLY_DEPRECATED(msg)
 #endif
 
-// noreturn
-#if defined(_MSC_VER)
-# define FOLLY_NORETURN __declspec(noreturn)
-#elif defined(__clang__) || defined(__GNUC__)
-# define FOLLY_NORETURN __attribute__((__noreturn__))
-#else
-# define FOLLY_NORETURN
-#endif
-
 // noinline
 #ifdef _MSC_VER
 # define FOLLY_NOINLINE __declspec(noinline)
@@ -231,7 +201,7 @@ namespace std { typedef ::max_align_t max_align_t; }
 # error cannot define platform specific thread local storage
 #endif
 
-#if defined(__APPLE__) && (TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE)
+#if FOLLY_MOBILE
 #undef FOLLY_TLS
 #endif
 
@@ -267,14 +237,6 @@ namespace std { typedef ::max_align_t max_align_t; }
 # define FOLLY_GLIBCXX_NAMESPACE_CXX11_END
 #endif
 
-// Some platforms lack clock_gettime(2) and clock_getres(2). Inject our own
-// versions of these into the global namespace.
-#if FOLLY_HAVE_CLOCK_GETTIME
-#include <time.h>
-#else
-#include <folly/detail/Clock.h>
-#endif
-
 // Provide our own std::__throw_* wrappers for platforms that don't have them
 #if FOLLY_HAVE_BITS_FUNCTEXCEPT_H
 #include <bits/functexcept.h>
@@ -307,11 +269,7 @@ namespace std { typedef ::max_align_t max_align_t; }
 // MSVC specific defines
 // mainly for posix compat
 #ifdef _MSC_VER
-
-// this definition is in a really silly place with a silly name
-// and ifdefing it every time we want it is painful
-#include <basetsd.h>
-typedef SSIZE_T ssize_t;
+#include <folly/portability/SysTypes.h>
 
 // sprintf semantics are not exactly identical
 // but current usage is not a problem
@@ -411,43 +369,6 @@ inline size_t malloc_usable_size(void* ptr) {
 # define FOLLY_HAS_RTTI 1
 #endif
 
-#ifdef _MSC_VER
-# include <intrin.h>
-#endif
-
-namespace folly {
-
-inline void asm_volatile_memory() {
-#if defined(__clang__) || defined(__GNUC__)
-  asm volatile("" : : : "memory");
-#elif defined(_MSC_VER)
-  ::_ReadWriteBarrier();
-#endif
-}
-
-inline void asm_volatile_pause() {
-#if defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
-  ::_mm_pause();
-#elif defined(__i386__) || FOLLY_X64
-  asm volatile ("pause");
-#elif FOLLY_A64 || defined(__arm__)
-  asm volatile ("yield");
-#elif FOLLY_PPC64
-  asm volatile("or 27,27,27");
-#endif
-}
-inline void asm_pause() {
-#if defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
-  ::_mm_pause();
-#elif defined(__i386__) || FOLLY_X64
-  asm ("pause");
-#elif FOLLY_A64 || defined(__arm__)
-  asm ("yield");
-#elif FOLLY_PPC64
-  asm ("or 31,31,31");
-#endif
-}
-
 #if defined(__APPLE__) || defined(_MSC_VER)
 #define MAX_STATIC_CONSTRUCTOR_PRIORITY
 #else
@@ -457,5 +378,4 @@ inline void asm_pause() {
 #define MAX_STATIC_CONSTRUCTOR_PRIORITY __attribute__ ((__init_priority__(102)))
 #endif
 
-} // namespace folly
 #endif // FOLLY_PORTABILITY_H_