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-rw-r--r--lib/lsan/lsan_thread.cpp162
1 files changed, 162 insertions, 0 deletions
diff --git a/lib/lsan/lsan_thread.cpp b/lib/lsan/lsan_thread.cpp
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+++ b/lib/lsan/lsan_thread.cpp
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+//=-- lsan_thread.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.
+// See lsan_thread.h for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "lsan_thread.h"
+
+#include "sanitizer_common/sanitizer_common.h"
+#include "sanitizer_common/sanitizer_placement_new.h"
+#include "sanitizer_common/sanitizer_thread_registry.h"
+#include "sanitizer_common/sanitizer_tls_get_addr.h"
+#include "lsan_allocator.h"
+#include "lsan_common.h"
+
+namespace __lsan {
+
+static ThreadRegistry *thread_registry;
+
+static ThreadContextBase *CreateThreadContext(u32 tid) {
+ void *mem = MmapOrDie(sizeof(ThreadContext), "ThreadContext");
+ return new(mem) ThreadContext(tid);
+}
+
+static const uptr kMaxThreads = 1 << 13;
+static const uptr kThreadQuarantineSize = 64;
+
+void InitializeThreadRegistry() {
+ static ALIGNED(64) char thread_registry_placeholder[sizeof(ThreadRegistry)];
+ thread_registry = new(thread_registry_placeholder)
+ ThreadRegistry(CreateThreadContext, kMaxThreads, kThreadQuarantineSize);
+}
+
+ThreadContext::ThreadContext(int tid)
+ : ThreadContextBase(tid),
+ stack_begin_(0),
+ stack_end_(0),
+ cache_begin_(0),
+ cache_end_(0),
+ tls_begin_(0),
+ tls_end_(0),
+ dtls_(nullptr) {}
+
+struct OnStartedArgs {
+ uptr stack_begin, stack_end,
+ cache_begin, cache_end,
+ tls_begin, tls_end;
+ DTLS *dtls;
+};
+
+void ThreadContext::OnStarted(void *arg) {
+ OnStartedArgs *args = reinterpret_cast<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 ThreadContext::OnFinished() {
+ AllocatorThreadFinish();
+ DTLS_Destroy();
+}
+
+u32 ThreadCreate(u32 parent_tid, uptr user_id, bool detached) {
+ return thread_registry->CreateThread(user_id, detached, parent_tid,
+ /* arg */ nullptr);
+}
+
+void ThreadStart(u32 tid, tid_t os_id, ThreadType thread_type) {
+ OnStartedArgs args;
+ uptr stack_size = 0;
+ uptr tls_size = 0;
+ GetThreadStackAndTls(tid == 0, &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();
+ thread_registry->StartThread(tid, os_id, thread_type, &args);
+}
+
+void ThreadFinish() {
+ thread_registry->FinishThread(GetCurrentThread());
+ SetCurrentThread(kInvalidTid);
+}
+
+ThreadContext *CurrentThreadContext() {
+ if (!thread_registry) return nullptr;
+ if (GetCurrentThread() == kInvalidTid)
+ return nullptr;
+ // No lock needed when getting current thread.
+ return (ThreadContext *)thread_registry->GetThreadLocked(GetCurrentThread());
+}
+
+static bool FindThreadByUid(ThreadContextBase *tctx, void *arg) {
+ uptr uid = (uptr)arg;
+ if (tctx->user_id == uid && tctx->status != ThreadStatusInvalid) {
+ return true;
+ }
+ return false;
+}
+
+u32 ThreadTid(uptr uid) {
+ return thread_registry->FindThread(FindThreadByUid, (void*)uid);
+}
+
+void ThreadJoin(u32 tid) {
+ CHECK_NE(tid, kInvalidTid);
+ thread_registry->JoinThread(tid, /* arg */nullptr);
+}
+
+void EnsureMainThreadIDIsCorrect() {
+ if (GetCurrentThread() == 0)
+ CurrentThreadContext()->os_id = GetTid();
+}
+
+///// Interface to the common LSan module. /////
+
+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 *>(
+ thread_registry->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 ForEachExtraStackRange(tid_t os_id, RangeIteratorCallback callback,
+ void *arg) {
+}
+
+void LockThreadRegistry() {
+ thread_registry->Lock();
+}
+
+void UnlockThreadRegistry() {
+ thread_registry->Unlock();
+}
+
+ThreadRegistry *GetThreadRegistryLocked() {
+ thread_registry->CheckLocked();
+ return thread_registry;
+}
+
+} // namespace __lsan