mirror of
https://github.com/autc04/Retro68.git
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184 lines
5.4 KiB
C++
184 lines
5.4 KiB
C++
//===-- asan_thread.h -------------------------------------------*- C++ -*-===//
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of AddressSanitizer, an address sanity checker.
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//
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// ASan-private header for asan_thread.cc.
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//===----------------------------------------------------------------------===//
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#ifndef ASAN_THREAD_H
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#define ASAN_THREAD_H
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#include "asan_allocator.h"
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#include "asan_internal.h"
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#include "asan_fake_stack.h"
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#include "asan_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 __asan {
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const u32 kInvalidTid = 0xffffff; // Must fit into 24 bits.
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const u32 kMaxNumberOfThreads = (1 << 22); // 4M
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class AsanThread;
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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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class AsanThreadContext : public ThreadContextBase {
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public:
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explicit AsanThreadContext(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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AsanThread *thread;
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void OnCreated(void *arg) override;
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void OnFinished() override;
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};
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// AsanThreadContext objects are never freed, so we need many of them.
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COMPILER_CHECK(sizeof(AsanThreadContext) <= 256);
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// AsanThread are stored in TSD and destroyed when the thread dies.
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class AsanThread {
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public:
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static AsanThread *Create(thread_callback_t start_routine, void *arg,
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u32 parent_tid, StackTrace *stack, bool detached);
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static void TSDDtor(void *tsd);
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void Destroy();
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void Init(); // Should be called from the thread itself.
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thread_return_t ThreadStart(uptr os_id,
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atomic_uintptr_t *signal_thread_is_registered);
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uptr stack_top() { return stack_top_; }
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uptr stack_bottom() { return stack_bottom_; }
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uptr stack_size() { return 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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u32 tid() { return context_->tid; }
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AsanThreadContext *context() { return context_; }
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void set_context(AsanThreadContext *context) { context_ = context; }
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struct StackFrameAccess {
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uptr offset;
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uptr frame_pc;
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const char *frame_descr;
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};
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bool GetStackFrameAccessByAddr(uptr addr, StackFrameAccess *access);
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bool AddrIsInStack(uptr addr) {
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return addr >= stack_bottom_ && addr < stack_top_;
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}
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void DeleteFakeStack(int tid) {
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if (!fake_stack_) return;
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FakeStack *t = fake_stack_;
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fake_stack_ = nullptr;
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SetTLSFakeStack(nullptr);
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t->Destroy(tid);
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}
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bool has_fake_stack() {
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return (reinterpret_cast<uptr>(fake_stack_) > 1);
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}
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FakeStack *fake_stack() {
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if (!__asan_option_detect_stack_use_after_return)
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return nullptr;
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if (!has_fake_stack())
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return AsyncSignalSafeLazyInitFakeStack();
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return fake_stack_;
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}
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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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// True if we are in a deadly signal handler.
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bool isInDeadlySignal() const { return in_deadly_signal_; }
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void setInDeadlySignal(bool b) { in_deadly_signal_ = b; }
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AsanThreadLocalMallocStorage &malloc_storage() { return malloc_storage_; }
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AsanStats &stats() { return stats_; }
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private:
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// NOTE: There is no AsanThread constructor. It is allocated
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// via mmap() and *must* be valid in zero-initialized state.
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void SetThreadStackAndTls();
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void ClearShadowForThreadStackAndTLS();
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FakeStack *AsyncSignalSafeLazyInitFakeStack();
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AsanThreadContext *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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// stack_size_ == stack_top_ - stack_bottom_;
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// It needs to be set in a async-signal-safe manner.
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uptr stack_size_;
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uptr tls_begin_;
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uptr tls_end_;
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FakeStack *fake_stack_;
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AsanThreadLocalMallocStorage malloc_storage_;
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AsanStats stats_;
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bool unwinding_;
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bool in_deadly_signal_;
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};
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// ScopedUnwinding is a scope for stacktracing member of a context
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class ScopedUnwinding {
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public:
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explicit ScopedUnwinding(AsanThread *t) : thread(t) {
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t->setUnwinding(true);
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}
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~ScopedUnwinding() { thread->setUnwinding(false); }
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private:
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AsanThread *thread;
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};
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// ScopedDeadlySignal is a scope for handling deadly signals.
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class ScopedDeadlySignal {
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public:
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explicit ScopedDeadlySignal(AsanThread *t) : thread(t) {
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if (thread) thread->setInDeadlySignal(true);
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}
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~ScopedDeadlySignal() {
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if (thread) thread->setInDeadlySignal(false);
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}
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private:
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AsanThread *thread;
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};
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// Returns a single instance of registry.
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ThreadRegistry &asanThreadRegistry();
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// Must be called under ThreadRegistryLock.
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AsanThreadContext *GetThreadContextByTidLocked(u32 tid);
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// Get the current thread. May return 0.
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AsanThread *GetCurrentThread();
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void SetCurrentThread(AsanThread *t);
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u32 GetCurrentTidOrInvalid();
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AsanThread *FindThreadByStackAddress(uptr addr);
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// Used to handle fork().
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void EnsureMainThreadIDIsCorrect();
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} // namespace __asan
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#endif // ASAN_THREAD_H
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