LLDB mainline
HistoryUnwind.cpp
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1//===-- HistoryUnwind.cpp -------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "lldb/lldb-private.h"
10
13
14#include "lldb/Target/Process.h"
16#include "lldb/Target/Target.h"
17#include "lldb/Target/Thread.h"
18
19#include <memory>
20
21using namespace lldb;
22using namespace lldb_private;
23
24// Constructor
25
26HistoryUnwind::HistoryUnwind(Thread &thread, std::vector<lldb::addr_t> pcs,
27 bool pcs_are_call_addresses)
28 : Unwind(thread), m_pcs(pcs),
29 m_pcs_are_call_addresses(pcs_are_call_addresses) {}
30
31// Destructor
32
34
36 std::lock_guard<std::recursive_mutex> guard(m_unwind_mutex);
37 m_pcs.clear();
38}
39
43 if (frame) {
45 &frame->GetThread()->GetProcess()->GetTarget());
46 if (pc != LLDB_INVALID_ADDRESS) {
47 rctx = std::make_shared<RegisterContextHistory>(
48 *frame->GetThread().get(), frame->GetConcreteFrameIndex(),
49 frame->GetThread()->GetProcess()->GetAddressByteSize(), pc);
50 }
51 }
52 return rctx;
53}
54
57 bool &behaves_like_zeroth_frame) {
58 // FIXME do not throw away the lock after we acquire it..
59 std::unique_lock<std::recursive_mutex> guard(m_unwind_mutex);
60 guard.unlock();
61 if (frame_idx < m_pcs.size()) {
62 cfa = frame_idx;
63 pc = m_pcs[frame_idx];
65 behaves_like_zeroth_frame = true;
66 else
67 behaves_like_zeroth_frame = (frame_idx == 0);
68 return true;
69 }
70 return false;
71}
72
73uint32_t HistoryUnwind::DoGetFrameCount() { return m_pcs.size(); }
lldb::addr_t GetLoadAddress(Target *target) const
Get the load address.
Definition: Address.cpp:313
bool m_pcs_are_call_addresses
This boolean indicates that the PCs in the non-0 frames are call addresses and not return addresses.
Definition: HistoryUnwind.h:41
lldb::RegisterContextSP DoCreateRegisterContextForFrame(StackFrame *frame) override
std::vector< lldb::addr_t > m_pcs
Definition: HistoryUnwind.h:38
uint32_t DoGetFrameCount() override
HistoryUnwind(Thread &thread, std::vector< lldb::addr_t > pcs, bool pcs_are_call_addresses=false)
bool DoGetFrameInfoAtIndex(uint32_t frame_idx, lldb::addr_t &cfa, lldb::addr_t &pc, bool &behaves_like_zeroth_frame) override
This base class provides an interface to stack frames.
Definition: StackFrame.h:43
lldb::ThreadSP GetThread() const
Definition: StackFrame.h:127
uint32_t GetConcreteFrameIndex() const
Query this frame to find what frame it is in this Thread's StackFrameList, not counting inlined frame...
Definition: StackFrame.h:429
const Address & GetFrameCodeAddress()
Get an Address for the current pc value in this StackFrame.
Definition: StackFrame.cpp:190
std::recursive_mutex m_unwind_mutex
Definition: Unwind.h:77
#define LLDB_INVALID_ADDRESS
Definition: lldb-defines.h:82
A class that represents a running process on the host machine.
Definition: SBAddress.h:15
uint64_t addr_t
Definition: lldb-types.h:80
std::shared_ptr< lldb_private::RegisterContext > RegisterContextSP
Definition: lldb-forward.h:389