2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
147 lines
4.7 KiB
C++
147 lines
4.7 KiB
C++
//===-- TargetThreadWindows.cpp----------------------------------*- 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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#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 "lldb/Utility/State.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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