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//===-- TargetThreadWindows.cpp--------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "lldb/Host/HostInfo.h"
#include "lldb/Target/Unwind.h"
#include "lldb/Utility/LLDBLog.h"
#include "lldb/Utility/Log.h"
#include "ProcessWindows.h"
#include "TargetThreadWindows.h"
#include "lldb/Host/windows/HostThreadWindows.h"
#include <llvm/Support/ConvertUTF.h>
#if defined(__x86_64__) || defined(_M_AMD64)
#include "x64/RegisterContextWindows_x64.h"
#elif defined(__i386__) || defined(_M_IX86)
#include "x86/RegisterContextWindows_x86.h"
#elif defined(__aarch64__) || defined(_M_ARM64)
#include "arm64/RegisterContextWindows_arm64.h"
#elif defined(__arm__) || defined(_M_ARM)
#include "arm/RegisterContextWindows_arm.h"
#endif
using namespace lldb;
using namespace lldb_private;
using GetThreadDescriptionFunctionPtr =
HRESULT(WINAPI *)(HANDLE hThread, PWSTR *ppszThreadDescription);
TargetThreadWindows::TargetThreadWindows(ProcessWindows &process,
const HostThread &thread)
: Thread(process, thread.GetNativeThread().GetThreadId()),
m_thread_reg_ctx_sp(), m_host_thread(thread) {}
TargetThreadWindows::~TargetThreadWindows() { DestroyThread(); }
void TargetThreadWindows::RefreshStateAfterStop() {
::SuspendThread(m_host_thread.GetNativeThread().GetSystemHandle());
SetState(eStateStopped);
GetRegisterContext()->InvalidateIfNeeded(false);
}
void TargetThreadWindows::WillResume(lldb::StateType resume_state) {}
void TargetThreadWindows::DidStop() {}
RegisterContextSP TargetThreadWindows::GetRegisterContext() {
if (!m_reg_context_sp)
m_reg_context_sp = CreateRegisterContextForFrame(nullptr);
return m_reg_context_sp;
}
RegisterContextSP
TargetThreadWindows::CreateRegisterContextForFrame(StackFrame *frame) {
RegisterContextSP reg_ctx_sp;
uint32_t concrete_frame_idx = 0;
Log *log = GetLog(LLDBLog::Thread);
if (frame)
concrete_frame_idx = frame->GetConcreteFrameIndex();
if (concrete_frame_idx == 0) {
if (!m_thread_reg_ctx_sp) {
ArchSpec arch = HostInfo::GetArchitecture();
switch (arch.GetMachine()) {
case llvm::Triple::arm:
case llvm::Triple::thumb:
#if defined(__arm__) || defined(_M_ARM)
m_thread_reg_ctx_sp.reset(
new RegisterContextWindows_arm(*this, concrete_frame_idx));
#else
LLDB_LOG(log, "debugging foreign targets is currently unsupported");
#endif
break;
case llvm::Triple::aarch64:
#if defined(__aarch64__) || defined(_M_ARM64)
m_thread_reg_ctx_sp.reset(
new RegisterContextWindows_arm64(*this, concrete_frame_idx));
#else
LLDB_LOG(log, "debugging foreign targets is currently unsupported");
#endif
break;
case llvm::Triple::x86:
#if defined(__i386__) || defined(_M_IX86)
m_thread_reg_ctx_sp.reset(
new RegisterContextWindows_x86(*this, concrete_frame_idx));
#else
LLDB_LOG(log, "debugging foreign targets is currently unsupported");
#endif
break;
case llvm::Triple::x86_64:
#if defined(__x86_64__) || defined(_M_AMD64)
m_thread_reg_ctx_sp.reset(
new RegisterContextWindows_x64(*this, concrete_frame_idx));
#else
LLDB_LOG(log, "debugging foreign targets is currently unsupported");
#endif
break;
default:
break;
}
}
reg_ctx_sp = m_thread_reg_ctx_sp;
} else {
reg_ctx_sp = GetUnwinder().CreateRegisterContextForFrame(frame);
}
return reg_ctx_sp;
}
bool TargetThreadWindows::CalculateStopInfo() {
SetStopInfo(m_stop_info_sp);
return true;
}
Status TargetThreadWindows::DoResume() {
StateType resume_state = GetTemporaryResumeState();
StateType current_state = GetState();
if (resume_state == current_state)
return Status();
if (resume_state == eStateStepping) {
Log *log = GetLog(LLDBLog::Thread);
uint32_t flags_index =
GetRegisterContext()->ConvertRegisterKindToRegisterNumber(
eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FLAGS);
uint64_t flags_value =
GetRegisterContext()->ReadRegisterAsUnsigned(flags_index, 0);
ProcessSP process = GetProcess();
const ArchSpec &arch = process->GetTarget().GetArchitecture();
switch (arch.GetMachine()) {
case llvm::Triple::x86:
case llvm::Triple::x86_64:
flags_value |= 0x100; // Set the trap flag on the CPU
break;
case llvm::Triple::aarch64:
case llvm::Triple::arm:
case llvm::Triple::thumb:
flags_value |= 0x200000; // The SS bit in PState
break;
default:
LLDB_LOG(log, "single stepping unsupported on this architecture");
break;
}
GetRegisterContext()->WriteRegisterFromUnsigned(flags_index, flags_value);
}
if (resume_state == eStateStepping || resume_state == eStateRunning) {
DWORD previous_suspend_count = 0;
HANDLE thread_handle = m_host_thread.GetNativeThread().GetSystemHandle();
do {
// ResumeThread returns -1 on error, or the thread's *previous* suspend
// count on success. This means that the return value is 1 when the thread
// was restarted. Note that DWORD is an unsigned int, so we need to
// explicitly compare with -1.
previous_suspend_count = ::ResumeThread(thread_handle);
if (previous_suspend_count == (DWORD)-1)
return Status(::GetLastError(), eErrorTypeWin32);
} while (previous_suspend_count > 1);
}
return Status();
}
const char *TargetThreadWindows::GetName() {
Log *log = GetLog(LLDBLog::Thread);
static GetThreadDescriptionFunctionPtr GetThreadDescription = []() {
HMODULE hModule = ::LoadLibraryW(L"Kernel32.dll");
return hModule
? reinterpret_cast<GetThreadDescriptionFunctionPtr>(
(void *)::GetProcAddress(hModule, "GetThreadDescription"))
: nullptr;
}();
LLDB_LOGF(log, "GetProcAddress: %p",
reinterpret_cast<void *>(GetThreadDescription));
if (!GetThreadDescription)
return m_name.c_str();
PWSTR pszThreadName;
if (SUCCEEDED(GetThreadDescription(
m_host_thread.GetNativeThread().GetSystemHandle(), &pszThreadName))) {
LLDB_LOGF(log, "GetThreadDescription: %ls", pszThreadName);
m_name.clear();
llvm::convertUTF16ToUTF8String(
llvm::ArrayRef(reinterpret_cast<char *>(pszThreadName),
wcslen(pszThreadName) * sizeof(wchar_t)),
m_name);
::LocalFree(pszThreadName);
}
return m_name.c_str();
}
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