| 1 | //===-- HistoryUnwind.cpp -------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "lldb/lldb-private.h" |
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| 10 | |
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| 11 | #include "Plugins/Process/Utility/HistoryUnwind.h" |
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| 12 | #include "Plugins/Process/Utility/RegisterContextHistory.h" |
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| 13 | |
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| 14 | #include "lldb/Target/Process.h" |
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| 15 | #include "lldb/Target/StackFrame.h" |
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| 16 | #include "lldb/Target/Target.h" |
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| 17 | #include "lldb/Target/Thread.h" |
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| 18 | |
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| 19 | #include <memory> |
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| 20 | |
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| 21 | using namespace lldb; |
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| 22 | using namespace lldb_private; |
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| 23 | |
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| 24 | // Constructor |
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| 25 | |
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| 26 | HistoryUnwind::HistoryUnwind(Thread &thread, std::vector<lldb::addr_t> pcs, |
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| 27 | bool pcs_are_call_addresses) |
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| 28 | : Unwind(thread), m_pcs(pcs), |
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| 29 | m_pcs_are_call_addresses(pcs_are_call_addresses) {} |
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| 30 | |
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| 31 | // Destructor |
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| 32 | |
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| 33 | HistoryUnwind::~HistoryUnwind() = default; |
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| 34 | |
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| 35 | void HistoryUnwind::DoClear() { |
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| 36 | std::lock_guard<std::recursive_mutex> guard(m_unwind_mutex); |
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| 37 | m_pcs.clear(); |
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| 38 | } |
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| 39 | |
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| 40 | lldb::RegisterContextSP |
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| 41 | HistoryUnwind::DoCreateRegisterContextForFrame(StackFrame *frame) { |
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| 42 | RegisterContextSP rctx; |
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| 43 | if (frame) { |
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| 44 | addr_t pc = frame->GetFrameCodeAddress().GetLoadAddress( |
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| 45 | target: &frame->GetThread()->GetProcess()->GetTarget()); |
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| 46 | if (pc != LLDB_INVALID_ADDRESS) { |
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| 47 | rctx = std::make_shared<RegisterContextHistory>( |
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| 48 | args&: *frame->GetThread().get(), args: frame->GetConcreteFrameIndex(), |
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| 49 | args: frame->GetThread()->GetProcess()->GetAddressByteSize(), args&: pc); |
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| 50 | } |
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| 51 | } |
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| 52 | return rctx; |
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| 53 | } |
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| 54 | |
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| 55 | bool HistoryUnwind::DoGetFrameInfoAtIndex(uint32_t frame_idx, lldb::addr_t &cfa, |
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| 56 | lldb::addr_t &pc, |
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| 57 | bool &behaves_like_zeroth_frame) { |
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| 58 | // FIXME do not throw away the lock after we acquire it.. |
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| 59 | std::unique_lock<std::recursive_mutex> guard(m_unwind_mutex); |
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| 60 | guard.unlock(); |
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| 61 | if (frame_idx < m_pcs.size()) { |
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| 62 | cfa = frame_idx; |
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| 63 | pc = m_pcs[frame_idx]; |
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| 64 | if (m_pcs_are_call_addresses) |
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| 65 | behaves_like_zeroth_frame = true; |
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| 66 | else |
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| 67 | behaves_like_zeroth_frame = (frame_idx == 0); |
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| 68 | return true; |
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| 69 | } |
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| 70 | return false; |
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| 71 | } |
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| 72 | |
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| 73 | uint32_t HistoryUnwind::DoGetFrameCount() { return m_pcs.size(); } |
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| 74 | |
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