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[Sanitizer] Introduce SANITIZER_CAN_USE_PREINIT_ARRAY definition and use it across sanitizers. 

Get rid of ASAN_USE_PREINIT_ARRAY and LSAN_USE_PREINIT_ARRAY - just always
use .preinit_array if it's available. This mode seems stable enough, and
we've been relying on default values of these macro for a long time.

llvm-svn: 213980
This commit is contained in:
Alexey Samsonov 2014-07-25 22:05:02 +00:00
parent a88a005190
commit 2178054216
5 changed files with 12 additions and 15 deletions
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4
compiler-rt/lib/asan/asan_internal.h
View File

@ -45,10 +45,6 @@
# endif
#endif
#ifndef ASAN_USE_PREINIT_ARRAY
# define ASAN_USE_PREINIT_ARRAY (SANITIZER_LINUX && !SANITIZER_ANDROID)
#endif
#ifndef ASAN_DYNAMIC
# ifdef PIC
# define ASAN_DYNAMIC 1

6
compiler-rt/lib/asan/asan_preinit.cc
View File

@ -10,14 +10,10 @@
// This file is a part of AddressSanitizer, an address sanity checker.
//
// Call __asan_init at the very early stage of process startup.
// On Linux we use .preinit_array section (unless PIC macro is defined).
//===----------------------------------------------------------------------===//
#include "asan_internal.h"
#if ASAN_USE_PREINIT_ARRAY && !defined(PIC)
// On Linux, we force __asan_init to be called before anyone else
// by placing it into .preinit_array section.
// FIXME: do we have anything like this on Mac?
#if SANITIZER_CAN_USE_PREINIT_ARRAY
// The symbol is called __local_asan_preinit, because it's not intended to be
// exported.
__attribute__((section(".preinit_array"), used))

2
compiler-rt/lib/dfsan/dfsan.cc
View File

@ -269,7 +269,7 @@ static void dfsan_init(int argc, char **argv, char **envp) {
InitializeInterceptors();
}
#ifndef DFSAN_NOLIBC
#ifndef DFSAN_NOLIBC && SANITIZER_CAN_USE_PREINIT_ARRAY
__attribute__((section(".preinit_array"), used))
static void (*dfsan_init_ptr)(int, char **, char **) = dfsan_init;
#endif

6
compiler-rt/lib/lsan/lsan_preinit.cc
View File

@ -14,11 +14,7 @@
#include "lsan.h"
#ifndef LSAN_USE_PREINIT_ARRAY
#define LSAN_USE_PREINIT_ARRAY 1
#endif
#if LSAN_USE_PREINIT_ARRAY && !defined(PIC)
#if SANITIZER_CAN_USE_PREINIT_ARRAY
// We force __lsan_init to be called before anyone else by placing it into
// .preinit_array section.
__attribute__((section(".preinit_array"), used))

9
compiler-rt/lib/sanitizer_common/sanitizer_internal_defs.h
View File

@ -34,6 +34,15 @@
# define SANITIZER_SUPPORTS_WEAK_HOOKS 0
#endif
// We can use .preinit_array section on Linux to call sanitizer initialization
// functions very early in the process startup (unless PIC macro is defined).
// FIXME: do we have anything like this on Mac?
#if SANITIZER_LINUX && !SANITIZER_ANDROID && !defined(PIC)
# define SANITIZER_CAN_USE_PREINIT_ARRAY 1
#else
# define SANITIZER_CAN_USE_PREINIT_ARRAY 0
#endif
// GCC does not understand __has_feature
#if !defined(__has_feature)
# define __has_feature(x) 0