| //=-- lsan_fuchsia.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 specific to Fuchsia. |
| // |
| //===---------------------------------------------------------------------===// |
| |
| #include "sanitizer_common/sanitizer_platform.h" |
| |
| #if SANITIZER_FUCHSIA |
| #include <zircon/sanitizer.h> |
| |
| #include "lsan.h" |
| #include "lsan_allocator.h" |
| |
| using namespace __lsan; |
| |
| namespace __lsan { |
| |
| void LsanOnDeadlySignal(int signo, void *siginfo, void *context) {} |
| |
| ThreadContext::ThreadContext(int tid) : ThreadContextLsanBase(tid) {} |
| |
| struct OnCreatedArgs { |
| uptr stack_begin, stack_end; |
| }; |
| |
| // On Fuchsia, the stack bounds of a new thread are available before |
| // the thread itself has started running. |
| void ThreadContext::OnCreated(void *arg) { |
| // Stack bounds passed through from __sanitizer_before_thread_create_hook |
| // or InitializeMainThread. |
| auto args = reinterpret_cast<const OnCreatedArgs *>(arg); |
| stack_begin_ = args->stack_begin; |
| stack_end_ = args->stack_end; |
| } |
| |
| struct OnStartedArgs { |
| uptr cache_begin, cache_end; |
| }; |
| |
| void ThreadContext::OnStarted(void *arg) { |
| ThreadContextLsanBase::OnStarted(arg); |
| auto args = reinterpret_cast<const OnStartedArgs *>(arg); |
| cache_begin_ = args->cache_begin; |
| cache_end_ = args->cache_end; |
| } |
| |
| void ThreadStart(u32 tid) { |
| OnStartedArgs args; |
| GetAllocatorCacheRange(&args.cache_begin, &args.cache_end); |
| CHECK_EQ(args.cache_end - args.cache_begin, sizeof(AllocatorCache)); |
| ThreadContextLsanBase::ThreadStart(tid, GetTid(), ThreadType::Regular, &args); |
| } |
| |
| void InitializeMainThread() { |
| OnCreatedArgs args; |
| __sanitizer::GetThreadStackTopAndBottom(true, &args.stack_end, |
| &args.stack_begin); |
| u32 tid = ThreadCreate(kMainTid, true, &args); |
| CHECK_EQ(tid, 0); |
| ThreadStart(tid); |
| } |
| |
| void GetAllThreadAllocatorCachesLocked(InternalMmapVector<uptr> *caches) { |
| GetLsanThreadRegistryLocked()->RunCallbackForEachThreadLocked( |
| [](ThreadContextBase *tctx, void *arg) { |
| auto ctx = static_cast<ThreadContext *>(tctx); |
| static_cast<decltype(caches)>(arg)->push_back(ctx->cache_begin()); |
| }, |
| caches); |
| } |
| |
| // On Fuchsia, leak detection is done by a special hook after atexit hooks. |
| // So this doesn't install any atexit hook like on other platforms. |
| void InstallAtExitCheckLeaks() {} |
| void InstallAtForkHandler() {} |
| |
| // ASan defines this to check its `halt_on_error` flag. |
| bool UseExitcodeOnLeak() { return true; } |
| |
| } // namespace __lsan |
| |
| // These are declared (in extern "C") by <zircon/sanitizer.h>. |
| // The system runtime will call our definitions directly. |
| |
| // This is called before each thread creation is attempted. So, in |
| // its first call, the calling thread is the initial and sole thread. |
| void *__sanitizer_before_thread_create_hook(thrd_t thread, bool detached, |
| const char *name, void *stack_base, |
| size_t stack_size) { |
| ENSURE_LSAN_INITED; |
| EnsureMainThreadIDIsCorrect(); |
| OnCreatedArgs args; |
| args.stack_begin = reinterpret_cast<uptr>(stack_base); |
| args.stack_end = args.stack_begin + stack_size; |
| u32 parent_tid = GetCurrentThreadId(); |
| u32 tid = ThreadCreate(parent_tid, detached, &args); |
| return reinterpret_cast<void *>(static_cast<uptr>(tid)); |
| } |
| |
| // This is called after creating a new thread (in the creating thread), |
| // with the pointer returned by __sanitizer_before_thread_create_hook (above). |
| void __sanitizer_thread_create_hook(void *hook, thrd_t thread, int error) { |
| u32 tid = static_cast<u32>(reinterpret_cast<uptr>(hook)); |
| // On success, there is nothing to do here. |
| if (error != thrd_success) { |
| // Clean up the thread registry for the thread creation that didn't happen. |
| GetLsanThreadRegistryLocked()->FinishThread(tid); |
| } |
| } |
| |
| // This is called in the newly-created thread before it runs anything else, |
| // with the pointer returned by __sanitizer_before_thread_create_hook (above). |
| void __sanitizer_thread_start_hook(void *hook, thrd_t self) { |
| u32 tid = static_cast<u32>(reinterpret_cast<uptr>(hook)); |
| ThreadStart(tid); |
| } |
| |
| // Each thread runs this just before it exits, |
| // with the pointer returned by BeforeThreadCreateHook (above). |
| // All per-thread destructors have already been called. |
| void __sanitizer_thread_exit_hook(void *hook, thrd_t self) { ThreadFinish(); } |
| |
| #endif // SANITIZER_FUCHSIA |