1 files changed, 135 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/memprof/memprof_thread.h b/contrib/llvm-project/compiler-rt/lib/memprof/memprof_thread.h
new file mode 100644
index 000000000000..4c9313fcb369
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/memprof/memprof_thread.h
@@ -0,0 +1,135 @@
+//===-- memprof_thread.h ---------------------------------------*- C++ -*-===//
+//
+// 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 MemProfiler, a memory profiler.
+//
+// MemProf-private header for memprof_thread.cpp.
+//===----------------------------------------------------------------------===//
+
+#ifndef MEMPROF_THREAD_H
+#define MEMPROF_THREAD_H
+
+#include "memprof_allocator.h"
+#include "memprof_internal.h"
+#include "memprof_stats.h"
+#include "sanitizer_common/sanitizer_common.h"
+#include "sanitizer_common/sanitizer_libc.h"
+#include "sanitizer_common/sanitizer_thread_registry.h"
+
+namespace __sanitizer {
+struct DTLS;
+} // namespace __sanitizer
+
+namespace __memprof {
+
+class MemprofThread;
+
+// These objects are created for every thread and are never deleted,
+// so we can find them by tid even if the thread is long dead.
+struct MemprofThreadContext final : public ThreadContextBase {
+  explicit MemprofThreadContext(int tid)
+      : ThreadContextBase(tid), announced(false),
+        destructor_iterations(GetPthreadDestructorIterations()), stack_id(0),
+        thread(nullptr) {}
+  bool announced;
+  u8 destructor_iterations;
+  u32 stack_id;
+  MemprofThread *thread;
+
+  void OnCreated(void *arg) override;
+  void OnFinished() override;
+
+  struct CreateThreadContextArgs {
+    MemprofThread *thread;
+    StackTrace *stack;
+  };
+};
+
+// MemprofThreadContext objects are never freed, so we need many of them.
+COMPILER_CHECK(sizeof(MemprofThreadContext) <= 256);
+
+// MemprofThread are stored in TSD and destroyed when the thread dies.
+class MemprofThread {
+public:
+  static MemprofThread *Create(thread_callback_t start_routine, void *arg,
+                               u32 parent_tid, StackTrace *stack,
+                               bool detached);
+  static void TSDDtor(void *tsd);
+  void Destroy();
+
+  struct InitOptions;
+  void Init(const InitOptions *options = nullptr);
+
+  thread_return_t ThreadStart(tid_t os_id,
+                              atomic_uintptr_t *signal_thread_is_registered);
+
+  uptr stack_top();
+  uptr stack_bottom();
+  uptr stack_size();
+  uptr tls_begin() { return tls_begin_; }
+  uptr tls_end() { return tls_end_; }
+  DTLS *dtls() { return dtls_; }
+  u32 tid() { return context_->tid; }
+  MemprofThreadContext *context() { return context_; }
+  void set_context(MemprofThreadContext *context) { context_ = context; }
+
+  bool AddrIsInStack(uptr addr);
+
+  // True is this thread is currently unwinding stack (i.e. collecting a stack
+  // trace). Used to prevent deadlocks on platforms where libc unwinder calls
+  // malloc internally. See PR17116 for more details.
+  bool isUnwinding() const { return unwinding_; }
+  void setUnwinding(bool b) { unwinding_ = b; }
+
+  MemprofThreadLocalMallocStorage &malloc_storage() { return malloc_storage_; }
+  MemprofStats &stats() { return stats_; }
+
+private:
+  // NOTE: There is no MemprofThread constructor. It is allocated
+  // via mmap() and *must* be valid in zero-initialized state.
+
+  void SetThreadStackAndTls(const InitOptions *options);
+
+  struct StackBounds {
+    uptr bottom;
+    uptr top;
+  };
+  StackBounds GetStackBounds() const;
+
+  MemprofThreadContext *context_;
+  thread_callback_t start_routine_;
+  void *arg_;
+
+  uptr stack_top_;
+  uptr stack_bottom_;
+
+  uptr tls_begin_;
+  uptr tls_end_;
+  DTLS *dtls_;
+
+  MemprofThreadLocalMallocStorage malloc_storage_;
+  MemprofStats stats_;
+  bool unwinding_;
+};
+
+// Returns a single instance of registry.
+ThreadRegistry &memprofThreadRegistry();
+
+// Must be called under ThreadRegistryLock.
+MemprofThreadContext *GetThreadContextByTidLocked(u32 tid);
+
+// Get the current thread. May return 0.
+MemprofThread *GetCurrentThread();
+void SetCurrentThread(MemprofThread *t);
+u32 GetCurrentTidOrInvalid();
+
+// Used to handle fork().
+void EnsureMainThreadIDIsCorrect();
+} // namespace __memprof
+
+#endif // MEMPROF_THREAD_H