b40ee7ff1b
Summary: The memory history plugin for Asan creates a HistoryThread with the recorded PC values provided by the Asan runtime. In other cases, thoses PCs are gathered by LLDB directly. The PCs returned by the Asan runtime are the PCs of the calls in the backtrace, not the return addresses you would normally get when unwinding the stack (look for a call to GetPreviousIntructionPc in AsanGetStack). When the above addresses are passed to the unwinder, it will subtract 1 from each address of the non zero frames because it treats them as return addresses. This can lead to the final report referencing the wrong line. This patch fixes this issue by threading a flag through HistoryThread and HistoryUnwinder that tells them to treat every frame like the first one. The Asan MemoryHistory plugin can then use this flag. This fixes running TestMemoryHistory on arm64 devices, although it's hard to guarantee that the test will continue to exhibit the boundary condition that triggers this bug. Reviewers: jasonmolenda, kubamracek Subscribers: kristof.beyls, danielkiss, lldb-commits Tags: #lldb Differential Revision: https://reviews.llvm.org/D76341
47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
//===-- HistoryUnwind.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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#ifndef LLDB_SOURCE_PLUGINS_PROCESS_UTILITY_HISTORYUNWIND_H
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#define LLDB_SOURCE_PLUGINS_PROCESS_UTILITY_HISTORYUNWIND_H
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#include <vector>
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#include "lldb/Target/Unwind.h"
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#include "lldb/lldb-private.h"
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namespace lldb_private {
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class HistoryUnwind : public lldb_private::Unwind {
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public:
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HistoryUnwind(Thread &thread, std::vector<lldb::addr_t> pcs,
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bool pcs_are_call_addresses = false);
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~HistoryUnwind() override;
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protected:
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void DoClear() override;
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lldb::RegisterContextSP
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DoCreateRegisterContextForFrame(StackFrame *frame) override;
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bool DoGetFrameInfoAtIndex(uint32_t frame_idx, lldb::addr_t &cfa,
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lldb::addr_t &pc,
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bool &behaves_like_zeroth_frame) override;
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uint32_t DoGetFrameCount() override;
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private:
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std::vector<lldb::addr_t> m_pcs;
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/// This boolean indicates that the PCs in the non-0 frames are call
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/// addresses and not return addresses.
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bool m_pcs_are_call_addresses;
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};
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} // namespace lldb_private
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#endif // LLDB_SOURCE_PLUGINS_PROCESS_UTILITY_HISTORYUNWIND_H
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