1 files changed, 216 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/asan/asan_thread.h b/contrib/llvm-project/compiler-rt/lib/asan/asan_thread.h
new file mode 100644
index 000000000000..62f1b5337fe4
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/asan/asan_thread.h
@@ -0,0 +1,216 @@
+//===-- asan_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 AddressSanitizer, an address sanity checker.
+//
+// ASan-private header for asan_thread.cpp.
+//===----------------------------------------------------------------------===//
+
+#ifndef ASAN_THREAD_H
+#define ASAN_THREAD_H
+
+#include "asan_allocator.h"
+#include "asan_fake_stack.h"
+#include "asan_internal.h"
+#include "asan_stats.h"
+#include "sanitizer_common/sanitizer_common.h"
+#include "sanitizer_common/sanitizer_libc.h"
+#include "sanitizer_common/sanitizer_thread_arg_retval.h"
+#include "sanitizer_common/sanitizer_thread_registry.h"
+
+namespace __sanitizer {
+struct DTLS;
+}  // namespace __sanitizer
+
+namespace __asan {
+
+class AsanThread;
+
+// 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.
+class AsanThreadContext final : public ThreadContextBase {
+ public:
+  explicit AsanThreadContext(int tid)
+      : ThreadContextBase(tid), announced(false),
+        destructor_iterations(GetPthreadDestructorIterations()), stack_id(0),
+        thread(nullptr) {}
+  bool announced;
+  u8 destructor_iterations;
+  u32 stack_id;
+  AsanThread *thread;
+
+  void OnCreated(void *arg) override;
+  void OnFinished() override;
+
+  struct CreateThreadContextArgs {
+    AsanThread *thread;
+    StackTrace *stack;
+  };
+};
+
+// AsanThreadContext objects are never freed, so we need many of them.
+COMPILER_CHECK(sizeof(AsanThreadContext) <= 256);
+
+#if defined(_MSC_VER) && !defined(__clang__)
+// MSVC raises a warning about a nonstandard extension being used for the 0
+// sized element in this array. Disable this for warn-as-error builds.
+#  pragma warning(push)
+#  pragma warning(disable : 4200)
+#endif
+
+// AsanThread are stored in TSD and destroyed when the thread dies.
+class AsanThread {
+ public:
+  template <typename T>
+  static AsanThread *Create(const T &data, u32 parent_tid, StackTrace *stack,
+                            bool detached) {
+    return Create(&data, sizeof(data), parent_tid, stack, detached);
+  }
+  static AsanThread *Create(u32 parent_tid, StackTrace *stack, bool detached) {
+    return Create(nullptr, 0, parent_tid, stack, detached);
+  }
+  static void TSDDtor(void *tsd);
+  void Destroy();
+
+  struct InitOptions;
+  void Init(const InitOptions *options = nullptr);
+
+  void ThreadStart(tid_t os_id);
+  thread_return_t RunThread();
+
+  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; }
+  AsanThreadContext *context() { return context_; }
+  void set_context(AsanThreadContext *context) { context_ = context; }
+
+  struct StackFrameAccess {
+    uptr offset;
+    uptr frame_pc;
+    const char *frame_descr;
+  };
+  bool GetStackFrameAccessByAddr(uptr addr, StackFrameAccess *access);
+
+  // Returns a pointer to the start of the stack variable's shadow memory.
+  uptr GetStackVariableShadowStart(uptr addr);
+
+  bool AddrIsInStack(uptr addr);
+
+  void DeleteFakeStack(int tid) {
+    if (!fake_stack_) return;
+    FakeStack *t = fake_stack_;
+    fake_stack_ = nullptr;
+    SetTLSFakeStack(nullptr);
+    t->Destroy(tid);
+  }
+
+  void StartSwitchFiber(FakeStack **fake_stack_save, uptr bottom, uptr size);
+  void FinishSwitchFiber(FakeStack *fake_stack_save, uptr *bottom_old,
+                         uptr *size_old);
+
+  FakeStack *get_fake_stack() {
+    if (atomic_load(&stack_switching_, memory_order_relaxed))
+      return nullptr;
+    if (reinterpret_cast<uptr>(fake_stack_) <= 1)
+      return nullptr;
+    return fake_stack_;
+  }
+
+  FakeStack *get_or_create_fake_stack() {
+    if (atomic_load(&stack_switching_, memory_order_relaxed))
+      return nullptr;
+    if (reinterpret_cast<uptr>(fake_stack_) <= 1)
+      return AsyncSignalSafeLazyInitFakeStack();
+    return fake_stack_;
+  }
+
+  // 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; }
+
+  AsanThreadLocalMallocStorage &malloc_storage() { return malloc_storage_; }
+  AsanStats &stats() { return stats_; }
+
+  void *extra_spill_area() { return &extra_spill_area_; }
+
+  template <typename T>
+  void GetStartData(T &data) const {
+    GetStartData(&data, sizeof(data));
+  }
+
+ private:
+  // NOTE: There is no AsanThread constructor. It is allocated
+  // via mmap() and *must* be valid in zero-initialized state.
+
+  static AsanThread *Create(const void *start_data, uptr data_size,
+                            u32 parent_tid, StackTrace *stack, bool detached);
+
+  void SetThreadStackAndTls(const InitOptions *options);
+
+  void ClearShadowForThreadStackAndTLS();
+  FakeStack *AsyncSignalSafeLazyInitFakeStack();
+
+  struct StackBounds {
+    uptr bottom;
+    uptr top;
+  };
+  StackBounds GetStackBounds() const;
+
+  void GetStartData(void *out, uptr out_size) const;
+
+  AsanThreadContext *context_;
+
+  uptr stack_top_;
+  uptr stack_bottom_;
+  // these variables are used when the thread is about to switch stack
+  uptr next_stack_top_;
+  uptr next_stack_bottom_;
+  // true if switching is in progress
+  atomic_uint8_t stack_switching_;
+
+  uptr tls_begin_;
+  uptr tls_end_;
+  DTLS *dtls_;
+
+  FakeStack *fake_stack_;
+  AsanThreadLocalMallocStorage malloc_storage_;
+  AsanStats stats_;
+  bool unwinding_;
+  uptr extra_spill_area_;
+
+  char start_data_[];
+};
+
+#if defined(_MSC_VER) && !defined(__clang__)
+#  pragma warning(pop)
+#endif
+
+// Returns a single instance of registry.
+ThreadRegistry &asanThreadRegistry();
+ThreadArgRetval &asanThreadArgRetval();
+
+// Must be called under ThreadRegistryLock.
+AsanThreadContext *GetThreadContextByTidLocked(u32 tid);
+
+// Get the current thread. May return 0.
+AsanThread *GetCurrentThread();
+void SetCurrentThread(AsanThread *t);
+u32 GetCurrentTidOrInvalid();
+AsanThread *FindThreadByStackAddress(uptr addr);
+
+// Used to handle fork().
+void EnsureMainThreadIDIsCorrect();
+} // namespace __asan
+
+#endif // ASAN_THREAD_H