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//===-- asan_thread.h -------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of AddressSanitizer, an address sanity checker.
//
// ASan-private header for asan_thread.cc.
//===----------------------------------------------------------------------===//
#ifndef ASAN_THREAD_H
#define ASAN_THREAD_H
#include "asan_allocator.h"
#include "asan_internal.h"
#include "asan_fake_stack.h"
#include "asan_stack.h"
#include "asan_stats.h"
#include "sanitizer_common/sanitizer_libc.h"
#include "sanitizer_common/sanitizer_thread_registry.h"
namespace __asan {
const u32 kInvalidTid = 0xffffff; // Must fit into 24 bits.
const u32 kMaxNumberOfThreads = (1 << 22); // 4M
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 : public ThreadContextBase {
public:
explicit AsanThreadContext(int tid)
: ThreadContextBase(tid),
announced(false),
thread(0) {
internal_memset(&stack, 0, sizeof(stack));
}
bool announced;
StackTrace stack;
AsanThread *thread;
void OnCreated(void *arg);
void OnFinished();
};
// AsanThreadContext objects are never freed, so we need many of them.
COMPILER_CHECK(sizeof(AsanThreadContext) <= 4096);
// AsanThread are stored in TSD and destroyed when the thread dies.
class AsanThread {
public:
static AsanThread *Create(thread_callback_t start_routine, void *arg);
static void TSDDtor(void *tsd);
void Destroy();
void Init(); // Should be called from the thread itself.
thread_return_t ThreadStart(uptr os_id);
uptr stack_top() { return stack_top_; }
uptr stack_bottom() { return stack_bottom_; }
uptr stack_size() { return stack_top_ - stack_bottom_; }
u32 tid() { return context_->tid; }
AsanThreadContext *context() { return context_; }
void set_context(AsanThreadContext *context) { context_ = context; }
const char *GetFrameNameByAddr(uptr addr, uptr *offset, uptr *frame_pc);
bool AddrIsInStack(uptr addr) {
return addr >= stack_bottom_ && addr < stack_top_;
}
FakeStack &fake_stack() { return fake_stack_; }
AsanThreadLocalMallocStorage &malloc_storage() { return malloc_storage_; }
AsanStats &stats() { return stats_; }
private:
AsanThread() {}
void SetThreadStackTopAndBottom();
void ClearShadowForThreadStack();
AsanThreadContext *context_;
thread_callback_t start_routine_;
void *arg_;
uptr stack_top_;
uptr stack_bottom_;
FakeStack fake_stack_;
AsanThreadLocalMallocStorage malloc_storage_;
AsanStats stats_;
};
struct CreateThreadContextArgs {
AsanThread *thread;
StackTrace *stack;
};
// Returns a single instance of registry.
ThreadRegistry &asanThreadRegistry();
// 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);
} // namespace __asan
#endif // ASAN_THREAD_H
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