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[sanitizer] AndroidGetApiLevel for static executables. 

A version of AndroidGetApiLevel for static executables that is
completely compile-time.

The generic version uses dl_iterate_phdr which, even though it works
in static executables, crashes if called before libc is initialized.

llvm-svn: 343153
This commit is contained in:
Evgeniy Stepanov 2018-09-26 23:48:13 +00:00
parent 0dae636988
commit f42aa29b68
1 changed files with 14 additions and 1 deletions
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15
compiler-rt/lib/sanitizer_common/sanitizer_linux.cc
View File

@ -1671,6 +1671,16 @@ static int dl_iterate_phdr_test_cb(struct dl_phdr_info *info, size_t size,
static atomic_uint32_t android_api_level;
static AndroidApiLevel AndroidDetectApiLevelStatic() {
#if __ANDROID_API__ <= 19
return ANDROID_KITKAT;
#elif __ANDROID_API__ <= 22
return ANDROID_LOLLIPOP_MR1;
#else
return ANDROID_POST_LOLLIPOP;
#endif
}
static AndroidApiLevel AndroidDetectApiLevel() {
if (!&dl_iterate_phdr)
return ANDROID_KITKAT; // K or lower
@ -1683,11 +1693,14 @@ static AndroidApiLevel AndroidDetectApiLevel() {
// interesting to detect.
}
extern "C" __attribute__((weak)) void* _DYNAMIC;
AndroidApiLevel AndroidGetApiLevel() {
AndroidApiLevel level =
(AndroidApiLevel)atomic_load(&android_api_level, memory_order_relaxed);
if (level) return level;
level = AndroidDetectApiLevel();
level = &_DYNAMIC == nullptr ? AndroidDetectApiLevelStatic()
: AndroidDetectApiLevel();
atomic_store(&android_api_level, level, memory_order_relaxed);
return level;
}