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