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//===-- hwasan_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 HWAddressSanitizer.
//
//===----------------------------------------------------------------------===//
#ifndef HWASAN_THREAD_H
#define HWASAN_THREAD_H
#include "hwasan_allocator.h"
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_ring_buffer.h"
namespace __hwasan {
typedef __sanitizer::CompactRingBuffer<uptr> StackAllocationsRingBuffer;
class Thread {
public:
// These are optional parameters that can be passed to Init.
struct InitState;
void Init(uptr stack_buffer_start, uptr stack_buffer_size,
const InitState *state = nullptr);
void InitStackAndTls(const InitState *state = nullptr);
// Must be called from the thread itself.
void InitStackRingBuffer(uptr stack_buffer_start, uptr stack_buffer_size);
inline void EnsureRandomStateInited() {
if (UNLIKELY(!random_state_inited_))
InitRandomState();
}
void Destroy();
uptr stack_top() { return stack_top_; }
uptr stack_bottom() { return stack_bottom_; }
uptr stack_size() { return stack_top() - stack_bottom(); }
uptr tls_begin() { return tls_begin_; }
uptr tls_end() { return tls_end_; }
bool IsMainThread() { return unique_id_ == 0; }
bool AddrIsInStack(uptr addr) {
return addr >= stack_bottom_ && addr < stack_top_;
}
AllocatorCache *allocator_cache() { return &allocator_cache_; }
HeapAllocationsRingBuffer *heap_allocations() { return heap_allocations_; }
StackAllocationsRingBuffer *stack_allocations() { return stack_allocations_; }
tag_t GenerateRandomTag(uptr num_bits = kTagBits);
void DisableTagging() { tagging_disabled_++; }
void EnableTagging() { tagging_disabled_--; }
u64 unique_id() const { return unique_id_; }
void Announce() {
if (announced_) return;
announced_ = true;
Print("Thread: ");
}
uptr &vfork_spill() { return vfork_spill_; }
private:
// NOTE: There is no Thread constructor. It is allocated
// via mmap() and *must* be valid in zero-initialized state.
void ClearShadowForThreadStackAndTLS();
void Print(const char *prefix);
void InitRandomState();
uptr vfork_spill_;
uptr stack_top_;
uptr stack_bottom_;
uptr tls_begin_;
uptr tls_end_;
u32 random_state_;
u32 random_buffer_;
AllocatorCache allocator_cache_;
HeapAllocationsRingBuffer *heap_allocations_;
StackAllocationsRingBuffer *stack_allocations_;
u64 unique_id_; // counting from zero.
u32 tagging_disabled_; // if non-zero, malloc uses zero tag in this thread.
bool announced_;
bool random_state_inited_; // Whether InitRandomState() has been called.
friend struct ThreadListHead;
};
Thread *GetCurrentThread();
uptr *GetCurrentThreadLongPtr();
struct ScopedTaggingDisabler {
ScopedTaggingDisabler() { GetCurrentThread()->DisableTagging(); }
~ScopedTaggingDisabler() { GetCurrentThread()->EnableTagging(); }
};
} // namespace __hwasan
#endif // HWASAN_THREAD_H
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