lsan_fuchsia.cpp
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//=-- 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) {
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(0, GetThreadSelf(), true, &args);
CHECK_EQ(tid, 0);
ThreadStart(tid);
}
void GetAllThreadAllocatorCachesLocked(InternalMmapVector<uptr> *caches) {
GetThreadRegistryLocked()->RunCallbackForEachThreadLocked(
[](ThreadContextBase *tctx, void *arg) {
auto ctx = static_cast<ThreadContext *>(tctx);
static_cast<decltype(caches)>(arg)->push_back(ctx->cache_begin());
},
caches);
}
} // 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) {
uptr user_id = reinterpret_cast<uptr>(thread);
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 = GetCurrentThread();
u32 tid = ThreadCreate(parent_tid, user_id, 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.
GetThreadRegistryLocked()->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