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//=-- lsan_posix.cpp -----------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===---------------------------------------------------------------------===//
//
// This file is a part of LeakSanitizer.
// Standalone LSan RTL code common to POSIX-like systems.
//
//===---------------------------------------------------------------------===//
#include "sanitizer_common/sanitizer_platform.h"
#if SANITIZER_POSIX
# include <pthread.h>
# include "lsan.h"
# include "lsan_allocator.h"
# include "lsan_thread.h"
# include "sanitizer_common/sanitizer_stacktrace.h"
# include "sanitizer_common/sanitizer_tls_get_addr.h"
namespace __lsan {
ThreadContext::ThreadContext(int tid) : ThreadContextLsanBase(tid) {}
struct OnStartedArgs {
uptr stack_begin;
uptr stack_end;
uptr cache_begin;
uptr cache_end;
uptr tls_begin;
uptr tls_end;
DTLS *dtls;
};
void ThreadContext::OnStarted(void *arg) {
ThreadContextLsanBase::OnStarted(arg);
auto args = reinterpret_cast<const OnStartedArgs *>(arg);
stack_begin_ = args->stack_begin;
stack_end_ = args->stack_end;
tls_begin_ = args->tls_begin;
tls_end_ = args->tls_end;
cache_begin_ = args->cache_begin;
cache_end_ = args->cache_end;
dtls_ = args->dtls;
}
void ThreadStart(u32 tid, tid_t os_id, ThreadType thread_type) {
OnStartedArgs args;
uptr stack_size = 0;
uptr tls_size = 0;
GetThreadStackAndTls(tid == kMainTid, &args.stack_begin, &stack_size,
&args.tls_begin, &tls_size);
args.stack_end = args.stack_begin + stack_size;
args.tls_end = args.tls_begin + tls_size;
GetAllocatorCacheRange(&args.cache_begin, &args.cache_end);
args.dtls = DTLS_Get();
ThreadContextLsanBase::ThreadStart(tid, os_id, thread_type, &args);
}
bool GetThreadRangesLocked(tid_t os_id, uptr *stack_begin, uptr *stack_end,
uptr *tls_begin, uptr *tls_end, uptr *cache_begin,
uptr *cache_end, DTLS **dtls) {
ThreadContext *context = static_cast<ThreadContext *>(
GetLsanThreadRegistryLocked()->FindThreadContextByOsIDLocked(os_id));
if (!context)
return false;
*stack_begin = context->stack_begin();
*stack_end = context->stack_end();
*tls_begin = context->tls_begin();
*tls_end = context->tls_end();
*cache_begin = context->cache_begin();
*cache_end = context->cache_end();
*dtls = context->dtls();
return true;
}
void InitializeMainThread() {
u32 tid = ThreadCreate(kMainTid, true);
CHECK_EQ(tid, kMainTid);
ThreadStart(tid, GetTid());
}
static void OnStackUnwind(const SignalContext &sig, const void *,
BufferedStackTrace *stack) {
stack->Unwind(StackTrace::GetNextInstructionPc(sig.pc), sig.bp, sig.context,
common_flags()->fast_unwind_on_fatal);
}
void LsanOnDeadlySignal(int signo, void *siginfo, void *context) {
HandleDeadlySignal(siginfo, context, GetCurrentThreadId(), &OnStackUnwind,
nullptr);
}
void InstallAtExitCheckLeaks() {
if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit)
Atexit(DoLeakCheck);
}
static void BeforeFork() {
LockGlobal();
LockThreads();
LockAllocator();
StackDepotLockBeforeFork();
}
static void AfterFork(bool fork_child) {
StackDepotUnlockAfterFork(fork_child);
UnlockAllocator();
UnlockThreads();
UnlockGlobal();
}
void InstallAtForkHandler() {
# if SANITIZER_SOLARIS || SANITIZER_NETBSD || SANITIZER_APPLE
return; // FIXME: Implement FutexWait.
# endif
pthread_atfork(
&BeforeFork, []() { AfterFork(/* fork_child= */ false); },
[]() { AfterFork(/* fork_child= */ true); });
}
} // namespace __lsan
#endif // SANITIZER_POSIX
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