forked from OSchip/llvm-project
132 lines
3.8 KiB
C++
132 lines
3.8 KiB
C++
//===-- asan_thread.h -------------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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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_stack.h"
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#include "asan_stats.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),
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announced(false),
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thread(0) {
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internal_memset(&stack, 0, sizeof(stack));
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}
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bool announced;
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StackTrace stack;
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AsanThread *thread;
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void OnCreated(void *arg);
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void OnFinished();
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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) <= 4096);
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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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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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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_top_ - stack_bottom_; }
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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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const char *GetFrameNameByAddr(uptr addr, uptr *offset, uptr *frame_pc);
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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 LazyInitFakeStack() {
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if (fake_stack_) return;
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fake_stack_ = (FakeStack*)MmapOrDie(sizeof(FakeStack), "FakeStack");
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fake_stack_->Init(stack_size());
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}
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void DeleteFakeStack() {
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if (!fake_stack_) return;
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fake_stack_->Cleanup();
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UnmapOrDie(fake_stack_, sizeof(FakeStack));
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}
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FakeStack *fake_stack() { return fake_stack_; }
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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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AsanThread() {}
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void SetThreadStackAndTls();
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void ClearShadowForThreadStackAndTLS();
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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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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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};
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struct CreateThreadContextArgs {
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AsanThread *thread;
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StackTrace *stack;
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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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