136 lines
4.0 KiB
C++
136 lines
4.0 KiB
C++
//===-- memprof_thread.h ---------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of MemProfiler, a memory profiler.
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//
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// MemProf-private header for memprof_thread.cpp.
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//===----------------------------------------------------------------------===//
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#ifndef MEMPROF_THREAD_H
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#define MEMPROF_THREAD_H
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#include "memprof_allocator.h"
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#include "memprof_internal.h"
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#include "memprof_stats.h"
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#include "sanitizer_common/sanitizer_common.h"
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#include "sanitizer_common/sanitizer_libc.h"
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#include "sanitizer_common/sanitizer_thread_registry.h"
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namespace __sanitizer {
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struct DTLS;
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} // namespace __sanitizer
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namespace __memprof {
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class MemprofThread;
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// These objects are created for every thread and are never deleted,
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// so we can find them by tid even if the thread is long dead.
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struct MemprofThreadContext final : public ThreadContextBase {
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explicit MemprofThreadContext(int tid)
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: ThreadContextBase(tid), announced(false),
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destructor_iterations(GetPthreadDestructorIterations()), stack_id(0),
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thread(nullptr) {}
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bool announced;
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u8 destructor_iterations;
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u32 stack_id;
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MemprofThread *thread;
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void OnCreated(void *arg) override;
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void OnFinished() override;
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struct CreateThreadContextArgs {
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MemprofThread *thread;
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StackTrace *stack;
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};
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};
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// MemprofThreadContext objects are never freed, so we need many of them.
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COMPILER_CHECK(sizeof(MemprofThreadContext) <= 256);
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// MemprofThread are stored in TSD and destroyed when the thread dies.
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class MemprofThread {
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public:
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static MemprofThread *Create(thread_callback_t start_routine, void *arg,
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u32 parent_tid, StackTrace *stack,
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bool detached);
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static void TSDDtor(void *tsd);
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void Destroy();
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struct InitOptions;
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void Init(const InitOptions *options = nullptr);
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thread_return_t ThreadStart(tid_t os_id,
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atomic_uintptr_t *signal_thread_is_registered);
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uptr stack_top();
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uptr stack_bottom();
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uptr stack_size();
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uptr tls_begin() { return tls_begin_; }
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uptr tls_end() { return tls_end_; }
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DTLS *dtls() { return dtls_; }
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u32 tid() { return context_->tid; }
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MemprofThreadContext *context() { return context_; }
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void set_context(MemprofThreadContext *context) { context_ = context; }
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bool AddrIsInStack(uptr addr);
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// True is this thread is currently unwinding stack (i.e. collecting a stack
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// trace). Used to prevent deadlocks on platforms where libc unwinder calls
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// malloc internally. See PR17116 for more details.
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bool isUnwinding() const { return unwinding_; }
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void setUnwinding(bool b) { unwinding_ = b; }
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MemprofThreadLocalMallocStorage &malloc_storage() { return malloc_storage_; }
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MemprofStats &stats() { return stats_; }
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private:
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// NOTE: There is no MemprofThread constructor. It is allocated
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// via mmap() and *must* be valid in zero-initialized state.
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void SetThreadStackAndTls(const InitOptions *options);
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struct StackBounds {
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uptr bottom;
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uptr top;
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};
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StackBounds GetStackBounds() const;
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MemprofThreadContext *context_;
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thread_callback_t start_routine_;
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void *arg_;
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uptr stack_top_;
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uptr stack_bottom_;
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uptr tls_begin_;
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uptr tls_end_;
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DTLS *dtls_;
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MemprofThreadLocalMallocStorage malloc_storage_;
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MemprofStats stats_;
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bool unwinding_;
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};
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// Returns a single instance of registry.
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ThreadRegistry &memprofThreadRegistry();
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// Must be called under ThreadRegistryLock.
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MemprofThreadContext *GetThreadContextByTidLocked(u32 tid);
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// Get the current thread. May return 0.
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MemprofThread *GetCurrentThread();
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void SetCurrentThread(MemprofThread *t);
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u32 GetCurrentTidOrInvalid();
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// Used to handle fork().
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void EnsureMainThreadIDIsCorrect();
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} // namespace __memprof
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#endif // MEMPROF_THREAD_H
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