45d8134c3b
Summary: This is a clean version of the change suggested here: https://bugs.llvm.org/show_bug.cgi?id=37495 The main change is to follow the same pattern as non-windows targets and use an unwinder object to retrieve the register context. I also changed a couple of the comments to actually log, so that issues with unsupported scenarios can be tracked down more easily. Lastly, ClearStackFrames is implemented in the base class, so individual thread implementations don't have to override it. Reviewers: asmith, zturner, aleksandr.urakov Reviewed By: aleksandr.urakov Subscribers: emaste, stella.stamenova, tatyana-krasnukha, llvm-commits Differential Revision: https://reviews.llvm.org/D49111 llvm-svn: 336732
148 lines
4.7 KiB
C++
148 lines
4.7 KiB
C++
//===-- TargetThreadWindows.cpp----------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Core/State.h"
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#include "lldb/Host/HostInfo.h"
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#include "lldb/Host/HostNativeThreadBase.h"
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#include "lldb/Host/windows/HostThreadWindows.h"
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#include "lldb/Host/windows/windows.h"
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#include "lldb/Target/RegisterContext.h"
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#include "lldb/Utility/Log.h"
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#include "lldb/Utility/Logging.h"
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#include "Plugins/Process/Utility/UnwindLLDB.h"
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#include "ProcessWindows.h"
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#include "ProcessWindowsLog.h"
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#include "TargetThreadWindows.h"
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#if defined(_WIN64)
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#include "x64/RegisterContextWindows_x64.h"
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#else
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#include "x86/RegisterContextWindows_x86.h"
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#endif
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using namespace lldb;
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using namespace lldb_private;
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TargetThreadWindows::TargetThreadWindows(ProcessWindows &process,
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const HostThread &thread)
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: Thread(process, thread.GetNativeThread().GetThreadId()),
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m_thread_reg_ctx_sp(), m_host_thread(thread) {}
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TargetThreadWindows::~TargetThreadWindows() { DestroyThread(); }
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void TargetThreadWindows::RefreshStateAfterStop() {
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::SuspendThread(m_host_thread.GetNativeThread().GetSystemHandle());
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SetState(eStateStopped);
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GetRegisterContext()->InvalidateIfNeeded(false);
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}
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void TargetThreadWindows::WillResume(lldb::StateType resume_state) {}
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void TargetThreadWindows::DidStop() {}
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RegisterContextSP TargetThreadWindows::GetRegisterContext() {
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if (!m_reg_context_sp)
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m_reg_context_sp = CreateRegisterContextForFrame(nullptr);
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return m_reg_context_sp;
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}
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RegisterContextSP
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TargetThreadWindows::CreateRegisterContextForFrame(StackFrame *frame) {
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RegisterContextSP reg_ctx_sp;
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uint32_t concrete_frame_idx = 0;
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Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_THREAD));
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if (frame)
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concrete_frame_idx = frame->GetConcreteFrameIndex();
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if (concrete_frame_idx == 0) {
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if (!m_thread_reg_ctx_sp) {
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ArchSpec arch = HostInfo::GetArchitecture();
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switch (arch.GetMachine()) {
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case llvm::Triple::x86:
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#if defined(_WIN64)
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// FIXME: This is a Wow64 process, create a RegisterContextWindows_Wow64
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LLDB_LOG(log, "This is a Wow64 process, we should create a "
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"RegisterContextWindows_Wow64, but we don't.");
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#else
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m_thread_reg_ctx_sp.reset(
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new RegisterContextWindows_x86(*this, concrete_frame_idx));
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#endif
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break;
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case llvm::Triple::x86_64:
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#if defined(_WIN64)
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m_thread_reg_ctx_sp.reset(
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new RegisterContextWindows_x64(*this, concrete_frame_idx));
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#else
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LLDB_LOG(log, "LLDB is 32-bit, but the target process is 64-bit.");
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#endif
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default:
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break;
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}
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}
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reg_ctx_sp = m_thread_reg_ctx_sp;
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} else {
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Unwind *unwinder = GetUnwinder();
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if (unwinder != nullptr)
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reg_ctx_sp = unwinder->CreateRegisterContextForFrame(frame);
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}
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return reg_ctx_sp;
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}
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bool TargetThreadWindows::CalculateStopInfo() {
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SetStopInfo(m_stop_info_sp);
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return true;
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}
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Unwind *TargetThreadWindows::GetUnwinder() {
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// FIXME: Implement an unwinder based on the Windows unwinder exposed through
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// DIA SDK.
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if (!m_unwinder_ap)
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m_unwinder_ap.reset(new UnwindLLDB(*this));
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return m_unwinder_ap.get();
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}
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Status TargetThreadWindows::DoResume() {
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StateType resume_state = GetTemporaryResumeState();
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StateType current_state = GetState();
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if (resume_state == current_state)
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return Status();
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if (resume_state == eStateStepping) {
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uint32_t flags_index =
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GetRegisterContext()->ConvertRegisterKindToRegisterNumber(
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eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FLAGS);
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uint64_t flags_value =
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GetRegisterContext()->ReadRegisterAsUnsigned(flags_index, 0);
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flags_value |= 0x100; // Set the trap flag on the CPU
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GetRegisterContext()->WriteRegisterFromUnsigned(flags_index, flags_value);
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}
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if (resume_state == eStateStepping || resume_state == eStateRunning) {
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DWORD previous_suspend_count = 0;
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HANDLE thread_handle = m_host_thread.GetNativeThread().GetSystemHandle();
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do {
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// ResumeThread returns -1 on error, or the thread's *previous* suspend
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// count on success. This means that the return value is 1 when the thread
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// was restarted. Note that DWORD is an unsigned int, so we need to
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// explicitly compare with -1.
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previous_suspend_count = ::ResumeThread(thread_handle);
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if (previous_suspend_count == (DWORD)-1)
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return Status(::GetLastError(), eErrorTypeWin32);
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} while (previous_suspend_count > 1);
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}
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return Status();
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}
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