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llvm-project/lldb/source/Plugins/Process/Windows/Common/ProcessWindows.cpp

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//===-- ProcessWindows.cpp --------------------------------------*- C++ -*-===//
//
// 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 "ProcessWindows.h"
// Windows includes
#include "lldb/Host/windows/windows.h"
#include <psapi.h>
#include "lldb/Breakpoint/Watchpoint.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/Section.h"
#include "lldb/Host/FileSystem.h"
#include "lldb/Host/HostNativeProcessBase.h"
#include "lldb/Host/HostProcess.h"
#include "lldb/Host/windows/HostThreadWindows.h"
#include "lldb/Host/windows/windows.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Target/DynamicLoader.h"
#include "lldb/Target/MemoryRegionInfo.h"
#include "lldb/Target/StopInfo.h"
#include "lldb/Target/Target.h"
#include "lldb/Utility/State.h"
#include "llvm/Support/ConvertUTF.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/Threading.h"
#include "llvm/Support/raw_ostream.h"
#include "DebuggerThread.h"
#include "ExceptionRecord.h"
#include "ForwardDecl.h"
#include "LocalDebugDelegate.h"
#include "ProcessWindowsLog.h"
#include "TargetThreadWindows.h"
using namespace lldb;
using namespace lldb_private;
namespace {
std::string GetProcessExecutableName(HANDLE process_handle) {
std::vector<wchar_t> file_name;
DWORD file_name_size = MAX_PATH; // first guess, not an absolute limit
DWORD copied = 0;
do {
file_name_size *= 2;
file_name.resize(file_name_size);
copied = ::GetModuleFileNameExW(process_handle, NULL, file_name.data(),
file_name_size);
} while (copied >= file_name_size);
file_name.resize(copied);
std::string result;
llvm::convertWideToUTF8(file_name.data(), result);
return result;
}
std::string GetProcessExecutableName(DWORD pid) {
std::string file_name;
HANDLE process_handle =
::OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, pid);
if (process_handle != NULL) {
file_name = GetProcessExecutableName(process_handle);
::CloseHandle(process_handle);
}
return file_name;
}
} // anonymous namespace
namespace lldb_private {
ProcessSP ProcessWindows::CreateInstance(lldb::TargetSP target_sp,
lldb::ListenerSP listener_sp,
const FileSpec *) {
return ProcessSP(new ProcessWindows(target_sp, listener_sp));
}
static bool ShouldUseLLDBServer() {
llvm::StringRef use_lldb_server = ::getenv("LLDB_USE_LLDB_SERVER");
return use_lldb_server.equals_lower("on") ||
use_lldb_server.equals_lower("yes") ||
use_lldb_server.equals_lower("1") ||
use_lldb_server.equals_lower("true");
}
void ProcessWindows::Initialize() {
if (!ShouldUseLLDBServer()) {
static llvm::once_flag g_once_flag;
llvm::call_once(g_once_flag, []() {
PluginManager::RegisterPlugin(GetPluginNameStatic(),
GetPluginDescriptionStatic(),
CreateInstance);
});
}
}
void ProcessWindows::Terminate() {}
lldb_private::ConstString ProcessWindows::GetPluginNameStatic() {
static ConstString g_name("windows");
return g_name;
}
const char *ProcessWindows::GetPluginDescriptionStatic() {
return "Process plugin for Windows";
}
// Constructors and destructors.
ProcessWindows::ProcessWindows(lldb::TargetSP target_sp,
lldb::ListenerSP listener_sp)
: lldb_private::Process(target_sp, listener_sp),
m_watchpoint_ids(
RegisterContextWindows::GetNumHardwareBreakpointSlots(),
LLDB_INVALID_BREAK_ID) {}
ProcessWindows::~ProcessWindows() {}
size_t ProcessWindows::GetSTDOUT(char *buf, size_t buf_size, Status &error) {
error.SetErrorString("GetSTDOUT unsupported on Windows");
return 0;
}
size_t ProcessWindows::GetSTDERR(char *buf, size_t buf_size, Status &error) {
error.SetErrorString("GetSTDERR unsupported on Windows");
return 0;
}
size_t ProcessWindows::PutSTDIN(const char *buf, size_t buf_size,
Status &error) {
error.SetErrorString("PutSTDIN unsupported on Windows");
return 0;
}
// ProcessInterface protocol.
lldb_private::ConstString ProcessWindows::GetPluginName() {
return GetPluginNameStatic();
}
uint32_t ProcessWindows::GetPluginVersion() { return 1; }
Status ProcessWindows::EnableBreakpointSite(BreakpointSite *bp_site) {
Log *log = ProcessWindowsLog::GetLogIfAny(WINDOWS_LOG_BREAKPOINTS);
LLDB_LOG(log, "bp_site = {0:x}, id={1}, addr={2:x}", bp_site,
bp_site->GetID(), bp_site->GetLoadAddress());
Status error = EnableSoftwareBreakpoint(bp_site);
if (!error.Success())
LLDB_LOG(log, "error: {0}", error);
return error;
}
Status ProcessWindows::DisableBreakpointSite(BreakpointSite *bp_site) {
Log *log = ProcessWindowsLog::GetLogIfAny(WINDOWS_LOG_BREAKPOINTS);
LLDB_LOG(log, "bp_site = {0:x}, id={1}, addr={2:x}", bp_site,
bp_site->GetID(), bp_site->GetLoadAddress());
Status error = DisableSoftwareBreakpoint(bp_site);
if (!error.Success())
LLDB_LOG(log, "error: {0}", error);
return error;
}
Status ProcessWindows::DoDetach(bool keep_stopped) {
Status error;
Log *log = ProcessWindowsLog::GetLogIfAny(WINDOWS_LOG_PROCESS);
StateType private_state = GetPrivateState();
if (private_state != eStateExited && private_state != eStateDetached) {
error = DetachProcess();
if (error.Success())
SetPrivateState(eStateDetached);
else
LLDB_LOG(log, "Detaching process error: {0}", error);
} else {
error.SetErrorStringWithFormatv("error: process {0} in state = {1}, but "
"cannot detach it in this state.",
GetID(), private_state);
LLDB_LOG(log, "error: {0}", error);
}
return error;
}
Status ProcessWindows::DoLaunch(Module *exe_module,
ProcessLaunchInfo &launch_info) {
Status error;
DebugDelegateSP delegate(new LocalDebugDelegate(shared_from_this()));
error = LaunchProcess(launch_info, delegate);
if (error.Success())
SetID(launch_info.GetProcessID());
return error;
}
Status
ProcessWindows::DoAttachToProcessWithID(lldb::pid_t pid,
const ProcessAttachInfo &attach_info) {
DebugDelegateSP delegate(new LocalDebugDelegate(shared_from_this()));
Status error = AttachProcess(pid, attach_info, delegate);
if (error.Success())
SetID(GetDebuggedProcessId());
return error;
}
Status ProcessWindows::DoResume() {
Log *log = ProcessWindowsLog::GetLogIfAny(WINDOWS_LOG_PROCESS);
llvm::sys::ScopedLock lock(m_mutex);
Status error;
StateType private_state = GetPrivateState();
if (private_state == eStateStopped || private_state == eStateCrashed) {
LLDB_LOG(log, "process {0} is in state {1}. Resuming...",
m_session_data->m_debugger->GetProcess().GetProcessId(),
GetPrivateState());
LLDB_LOG(log, "resuming {0} threads.", m_thread_list.GetSize());
bool failed = false;
for (uint32_t i = 0; i < m_thread_list.GetSize(); ++i) {
auto thread = std::static_pointer_cast<TargetThreadWindows>(
m_thread_list.GetThreadAtIndex(i));
Status result = thread->DoResume();
if (result.Fail()) {
failed = true;
LLDB_LOG(
log,
"Trying to resume thread at index {0}, but failed with error {1}.",
i, result);
}
}
if (failed) {
error.SetErrorString("ProcessWindows::DoResume failed");
} else {
SetPrivateState(eStateRunning);
}
ExceptionRecordSP active_exception =
m_session_data->m_debugger->GetActiveException().lock();
if (active_exception) {
// Resume the process and continue processing debug events. Mask the
// exception so that from the process's view, there is no indication that
// anything happened.
m_session_data->m_debugger->ContinueAsyncException(
ExceptionResult::MaskException);
}
} else {
LLDB_LOG(log, "error: process {0} is in state {1}. Returning...",
m_session_data->m_debugger->GetProcess().GetProcessId(),
GetPrivateState());
}
return error;
}
Status ProcessWindows::DoDestroy() {
StateType private_state = GetPrivateState();
return DestroyProcess(private_state);
}
Status ProcessWindows::DoHalt(bool &caused_stop) {
StateType state = GetPrivateState();
if (state != eStateStopped)
return HaltProcess(caused_stop);
caused_stop = false;
return Status();
}
void ProcessWindows::DidLaunch() {
ArchSpec arch_spec;
DidAttach(arch_spec);
}
void ProcessWindows::DidAttach(ArchSpec &arch_spec) {
llvm::sys::ScopedLock lock(m_mutex);
// The initial stop won't broadcast the state change event, so account for
// that here.
if (m_session_data && GetPrivateState() == eStateStopped &&
m_session_data->m_stop_at_entry)
RefreshStateAfterStop();
}
static void
DumpAdditionalExceptionInformation(llvm::raw_ostream &stream,
const ExceptionRecordSP &exception) {
// Decode additional exception information for specific exception types based
// on
// https://docs.microsoft.com/en-us/windows/desktop/api/winnt/ns-winnt-_exception_record
const int addr_min_width = 2 + 8; // "0x" + 4 address bytes
const std::vector<ULONG_PTR> &args = exception->GetExceptionArguments();
switch (exception->GetExceptionCode()) {
case EXCEPTION_ACCESS_VIOLATION: {
if (args.size() < 2)
break;
stream << ": ";
const int access_violation_code = args[0];
const lldb::addr_t access_violation_address = args[1];
switch (access_violation_code) {
case 0:
stream << "Access violation reading";
break;
case 1:
stream << "Access violation writing";
break;
case 8:
stream << "User-mode data execution prevention (DEP) violation at";
break;
default:
stream << "Unknown access violation (code " << access_violation_code
<< ") at";
break;
}
stream << " location "
<< llvm::format_hex(access_violation_address, addr_min_width);
break;
}
case EXCEPTION_IN_PAGE_ERROR: {
if (args.size() < 3)
break;
stream << ": ";
const int page_load_error_code = args[0];
const lldb::addr_t page_load_error_address = args[1];
const DWORD underlying_code = args[2];
switch (page_load_error_code) {
case 0:
stream << "In page error reading";
break;
case 1:
stream << "In page error writing";
break;
case 8:
stream << "User-mode data execution prevention (DEP) violation at";
break;
default:
stream << "Unknown page loading error (code " << page_load_error_code
<< ") at";
break;
}
stream << " location "
<< llvm::format_hex(page_load_error_address, addr_min_width)
<< " (status code " << llvm::format_hex(underlying_code, 8) << ")";
break;
}
}
}
void ProcessWindows::RefreshStateAfterStop() {
Log *log = ProcessWindowsLog::GetLogIfAny(WINDOWS_LOG_EXCEPTION);
llvm::sys::ScopedLock lock(m_mutex);
if (!m_session_data) {
LLDB_LOG(log, "no active session. Returning...");
return;
}
m_thread_list.RefreshStateAfterStop();
std::weak_ptr<ExceptionRecord> exception_record =
m_session_data->m_debugger->GetActiveException();
ExceptionRecordSP active_exception = exception_record.lock();
if (!active_exception) {
LLDB_LOG(log,
"there is no active exception in process {0}. Why is the "
"process stopped?",
m_session_data->m_debugger->GetProcess().GetProcessId());
return;
}
StopInfoSP stop_info;
m_thread_list.SetSelectedThreadByID(active_exception->GetThreadID());
ThreadSP stop_thread = m_thread_list.GetSelectedThread();
if (!stop_thread)
return;
switch (active_exception->GetExceptionCode()) {
case EXCEPTION_SINGLE_STEP: {
RegisterContextSP register_context = stop_thread->GetRegisterContext();
const uint64_t pc = register_context->GetPC();
BreakpointSiteSP site(GetBreakpointSiteList().FindByAddress(pc));
if (site && site->ValidForThisThread(stop_thread.get())) {
LLDB_LOG(log,
"Single-stepped onto a breakpoint in process {0} at "
"address {1:x} with breakpoint site {2}",
m_session_data->m_debugger->GetProcess().GetProcessId(), pc,
site->GetID());
stop_info = StopInfo::CreateStopReasonWithBreakpointSiteID(*stop_thread,
site->GetID());
stop_thread->SetStopInfo(stop_info);
return;
}
auto *reg_ctx = static_cast<RegisterContextWindows *>(
stop_thread->GetRegisterContext().get());
uint32_t slot_id = reg_ctx->GetTriggeredHardwareBreakpointSlotId();
if (slot_id != LLDB_INVALID_INDEX32) {
int id = m_watchpoint_ids[slot_id];
LLDB_LOG(log,
"Single-stepped onto a watchpoint in process {0} at address "
"{1:x} with watchpoint {2}",
m_session_data->m_debugger->GetProcess().GetProcessId(), pc, id);
if (lldb::WatchpointSP wp_sp =
GetTarget().GetWatchpointList().FindByID(id))
wp_sp->SetHardwareIndex(slot_id);
stop_info = StopInfo::CreateStopReasonWithWatchpointID(
*stop_thread, id, m_watchpoints[id].address);
stop_thread->SetStopInfo(stop_info);
return;
}
LLDB_LOG(log, "single stepping thread {0}", stop_thread->GetID());
stop_info = StopInfo::CreateStopReasonToTrace(*stop_thread);
stop_thread->SetStopInfo(stop_info);
return;
}
case EXCEPTION_BREAKPOINT: {
RegisterContextSP register_context = stop_thread->GetRegisterContext();
// The current EIP is AFTER the BP opcode, which is one byte.
uint64_t pc = register_context->GetPC() - 1;
BreakpointSiteSP site(GetBreakpointSiteList().FindByAddress(pc));
if (site) {
LLDB_LOG(log,
"detected breakpoint in process {0} at address {1:x} with "
"breakpoint site {2}",
m_session_data->m_debugger->GetProcess().GetProcessId(), pc,
site->GetID());
if (site->ValidForThisThread(stop_thread.get())) {
LLDB_LOG(log,
"Breakpoint site {0} is valid for this thread ({1:x}), "
"creating stop info.",
site->GetID(), stop_thread->GetID());
stop_info = StopInfo::CreateStopReasonWithBreakpointSiteID(
*stop_thread, site->GetID());
register_context->SetPC(pc);
} else {
LLDB_LOG(log,
"Breakpoint site {0} is not valid for this thread, "
"creating empty stop info.",
site->GetID());
}
stop_thread->SetStopInfo(stop_info);
return;
} else {
// The thread hit a hard-coded breakpoint like an `int 3` or
// `__debugbreak()`.
LLDB_LOG(log,
"No breakpoint site matches for this thread. __debugbreak()? "
"Creating stop info with the exception.");
// FALLTHROUGH: We'll treat this as a generic exception record in the
// default case.
LLVM_FALLTHROUGH;
}
}
default: {
std::string desc;
llvm::raw_string_ostream desc_stream(desc);
desc_stream << "Exception "
<< llvm::format_hex(active_exception->GetExceptionCode(), 8)
<< " encountered at address "
<< llvm::format_hex(active_exception->GetExceptionAddress(), 8);
DumpAdditionalExceptionInformation(desc_stream, active_exception);
stop_info = StopInfo::CreateStopReasonWithException(
*stop_thread, desc_stream.str().c_str());
stop_thread->SetStopInfo(stop_info);
LLDB_LOG(log, "{0}", desc_stream.str());
return;
}
}
}
bool ProcessWindows::CanDebug(lldb::TargetSP target_sp,
bool plugin_specified_by_name) {
if (plugin_specified_by_name)
return true;
// For now we are just making sure the file exists for a given module
ModuleSP exe_module_sp(target_sp->GetExecutableModule());
if (exe_module_sp.get())
return FileSystem::Instance().Exists(exe_module_sp->GetFileSpec());
// However, if there is no executable module, we return true since we might
// be preparing to attach.
return true;
}
bool ProcessWindows::UpdateThreadList(ThreadList &old_thread_list,
ThreadList &new_thread_list) {
Log *log = ProcessWindowsLog::GetLogIfAny(WINDOWS_LOG_THREAD);
// Add all the threads that were previously running and for which we did not
// detect a thread exited event.
int new_size = 0;
int continued_threads = 0;
int exited_threads = 0;
int new_threads = 0;
for (ThreadSP old_thread : old_thread_list.Threads()) {
lldb::tid_t old_thread_id = old_thread->GetID();
auto exited_thread_iter =
m_session_data->m_exited_threads.find(old_thread_id);
if (exited_thread_iter == m_session_data->m_exited_threads.end()) {
new_thread_list.AddThread(old_thread);
++new_size;
++continued_threads;
LLDB_LOGV(log, "Thread {0} was running and is still running.",
old_thread_id);
} else {
LLDB_LOGV(log, "Thread {0} was running and has exited.", old_thread_id);
++exited_threads;
}
}
// Also add all the threads that are new since the last time we broke into
// the debugger.
for (const auto &thread_info : m_session_data->m_new_threads) {
new_thread_list.AddThread(thread_info.second);
++new_size;
++new_threads;
LLDB_LOGV(log, "Thread {0} is new since last update.", thread_info.first);
}
LLDB_LOG(log, "{0} new threads, {1} old threads, {2} exited threads.",
new_threads, continued_threads, exited_threads);
m_session_data->m_new_threads.clear();
m_session_data->m_exited_threads.clear();
return new_size > 0;
}
bool ProcessWindows::IsAlive() {
StateType state = GetPrivateState();
switch (state) {
case eStateCrashed:
case eStateDetached:
case eStateUnloaded:
case eStateExited:
case eStateInvalid:
return false;
default:
return true;
}
}
size_t ProcessWindows::DoReadMemory(lldb::addr_t vm_addr, void *buf,
size_t size, Status &error) {
size_t bytes_read = 0;
error = ProcessDebugger::ReadMemory(vm_addr, buf, size, bytes_read);
return bytes_read;
}
size_t ProcessWindows::DoWriteMemory(lldb::addr_t vm_addr, const void *buf,
size_t size, Status &error) {
size_t bytes_written = 0;
error = ProcessDebugger::WriteMemory(vm_addr, buf, size, bytes_written);
return bytes_written;
}
lldb::addr_t ProcessWindows::DoAllocateMemory(size_t size, uint32_t permissions,
Status &error) {
lldb::addr_t vm_addr = LLDB_INVALID_ADDRESS;
error = ProcessDebugger::AllocateMemory(size, permissions, vm_addr);
return vm_addr;
}
Status ProcessWindows::DoDeallocateMemory(lldb::addr_t ptr) {
return ProcessDebugger::DeallocateMemory(ptr);
}
Status ProcessWindows::GetMemoryRegionInfo(lldb::addr_t vm_addr,
MemoryRegionInfo &info) {
return ProcessDebugger::GetMemoryRegionInfo(vm_addr, info);
}
lldb::addr_t ProcessWindows::GetImageInfoAddress() {
Target &target = GetTarget();
ObjectFile *obj_file = target.GetExecutableModule()->GetObjectFile();
Address addr = obj_file->GetImageInfoAddress(&target);
if (addr.IsValid())
return addr.GetLoadAddress(&target);
else
return LLDB_INVALID_ADDRESS;
}
DynamicLoaderWindowsDYLD *ProcessWindows::GetDynamicLoader() {
if (m_dyld_up.get() == NULL)
m_dyld_up.reset(DynamicLoader::FindPlugin(
this, DynamicLoaderWindowsDYLD::GetPluginNameStatic().GetCString()));
return static_cast<DynamicLoaderWindowsDYLD *>(m_dyld_up.get());
}
void ProcessWindows::OnExitProcess(uint32_t exit_code) {
// No need to acquire the lock since m_session_data isn't accessed.
Log *log = ProcessWindowsLog::GetLogIfAny(WINDOWS_LOG_PROCESS);
LLDB_LOG(log, "Process {0} exited with code {1}", GetID(), exit_code);
TargetSP target = CalculateTarget();
if (target) {
ModuleSP executable_module = target->GetExecutableModule();
ModuleList unloaded_modules;
unloaded_modules.Append(executable_module);
target->ModulesDidUnload(unloaded_modules, true);
}
SetProcessExitStatus(GetID(), true, 0, exit_code);
SetPrivateState(eStateExited);
// If the process exits before any initial stop then notify the debugger
// of the error otherwise WaitForDebuggerConnection() will be blocked.
// An example of this issue is when a process fails to load a dependent DLL.
if (m_session_data && !m_session_data->m_initial_stop_received) {
Status error(exit_code, eErrorTypeWin32);
OnDebuggerError(error, 0);
}
// Reset the session.
m_session_data.reset();
}
void ProcessWindows::OnDebuggerConnected(lldb::addr_t image_base) {
DebuggerThreadSP debugger = m_session_data->m_debugger;
Log *log = ProcessWindowsLog::GetLogIfAny(WINDOWS_LOG_PROCESS);
LLDB_LOG(log, "Debugger connected to process {0}. Image base = {1:x}",
debugger->GetProcess().GetProcessId(), image_base);
ModuleSP module = GetTarget().GetExecutableModule();
if (!module) {
// During attach, we won't have the executable module, so find it now.
const DWORD pid = debugger->GetProcess().GetProcessId();
const std::string file_name = GetProcessExecutableName(pid);
if (file_name.empty()) {
return;
}
FileSpec executable_file(file_name);
FileSystem::Instance().Resolve(executable_file);
ModuleSpec module_spec(executable_file);
Status error;
module =
GetTarget().GetOrCreateModule(module_spec, true /* notify */, &error);
if (!module) {
return;
}
GetTarget().SetExecutableModule(module, eLoadDependentsNo);
}
if (auto dyld = GetDynamicLoader())
dyld->OnLoadModule(module, ModuleSpec(), image_base);
// Add the main executable module to the list of pending module loads. We
// can't call GetTarget().ModulesDidLoad() here because we still haven't
// returned from DoLaunch() / DoAttach() yet so the target may not have set
// the process instance to `this` yet.
llvm::sys::ScopedLock lock(m_mutex);
const HostThread &host_main_thread = debugger->GetMainThread();
ThreadSP main_thread =
std::make_shared<TargetThreadWindows>(*this, host_main_thread);
tid_t id = host_main_thread.GetNativeThread().GetThreadId();
main_thread->SetID(id);
m_session_data->m_new_threads[id] = main_thread;
}
ExceptionResult
ProcessWindows::OnDebugException(bool first_chance,
const ExceptionRecord &record) {
Log *log = ProcessWindowsLog::GetLogIfAny(WINDOWS_LOG_EXCEPTION);
llvm::sys::ScopedLock lock(m_mutex);
// FIXME: Without this check, occasionally when running the test suite there
// is
// an issue where m_session_data can be null. It's not clear how this could
// happen but it only surfaces while running the test suite. In order to
// properly diagnose this, we probably need to first figure allow the test
// suite to print out full lldb logs, and then add logging to the process
// plugin.
if (!m_session_data) {
LLDB_LOG(log,
"Debugger thread reported exception {0:x} at address {1:x}, "
"but there is no session.",
record.GetExceptionCode(), record.GetExceptionAddress());
return ExceptionResult::SendToApplication;
}
if (!first_chance) {
// Not any second chance exception is an application crash by definition.
// It may be an expression evaluation crash.
SetPrivateState(eStateStopped);
}
ExceptionResult result = ExceptionResult::SendToApplication;
switch (record.GetExceptionCode()) {
case EXCEPTION_BREAKPOINT:
// Handle breakpoints at the first chance.
result = ExceptionResult::BreakInDebugger;
if (!m_session_data->m_initial_stop_received) {
LLDB_LOG(
log,
"Hit loader breakpoint at address {0:x}, setting initial stop event.",
record.GetExceptionAddress());
m_session_data->m_initial_stop_received = true;
::SetEvent(m_session_data->m_initial_stop_event);
} else {
LLDB_LOG(log, "Hit non-loader breakpoint at address {0:x}.",
record.GetExceptionAddress());
}
SetPrivateState(eStateStopped);
break;
case EXCEPTION_SINGLE_STEP:
result = ExceptionResult::BreakInDebugger;
SetPrivateState(eStateStopped);
break;
default:
LLDB_LOG(log,
"Debugger thread reported exception {0:x} at address {1:x} "
"(first_chance={2})",
record.GetExceptionCode(), record.GetExceptionAddress(),
first_chance);
// For non-breakpoints, give the application a chance to handle the
// exception first.
if (first_chance)
result = ExceptionResult::SendToApplication;
else
result = ExceptionResult::BreakInDebugger;
}
return result;
}
void ProcessWindows::OnCreateThread(const HostThread &new_thread) {
llvm::sys::ScopedLock lock(m_mutex);
ThreadSP thread = std::make_shared<TargetThreadWindows>(*this, new_thread);
const HostNativeThread &native_new_thread = new_thread.GetNativeThread();
tid_t id = native_new_thread.GetThreadId();
thread->SetID(id);
m_session_data->m_new_threads[id] = thread;
for (const std::map<int, WatchpointInfo>::value_type &p : m_watchpoints) {
auto *reg_ctx = static_cast<RegisterContextWindows *>(
thread->GetRegisterContext().get());
reg_ctx->AddHardwareBreakpoint(p.second.slot_id, p.second.address,
p.second.size, p.second.read,
p.second.write);
}
}
void ProcessWindows::OnExitThread(lldb::tid_t thread_id, uint32_t exit_code) {
llvm::sys::ScopedLock lock(m_mutex);
// On a forced termination, we may get exit thread events after the session
// data has been cleaned up.
if (!m_session_data)
return;
// A thread may have started and exited before the debugger stopped allowing a
// refresh.
// Just remove it from the new threads list in that case.
auto iter = m_session_data->m_new_threads.find(thread_id);
if (iter != m_session_data->m_new_threads.end())
m_session_data->m_new_threads.erase(iter);
else
m_session_data->m_exited_threads.insert(thread_id);
}
void ProcessWindows::OnLoadDll(const ModuleSpec &module_spec,
lldb::addr_t module_addr) {
if (auto dyld = GetDynamicLoader())
dyld->OnLoadModule(nullptr, module_spec, module_addr);
}
void ProcessWindows::OnUnloadDll(lldb::addr_t module_addr) {
if (auto dyld = GetDynamicLoader())
dyld->OnUnloadModule(module_addr);
}
void ProcessWindows::OnDebugString(const std::string &string) {}
void ProcessWindows::OnDebuggerError(const Status &error, uint32_t type) {
llvm::sys::ScopedLock lock(m_mutex);
Log *log = ProcessWindowsLog::GetLogIfAny(WINDOWS_LOG_PROCESS);
if (m_session_data->m_initial_stop_received) {
// This happened while debugging. Do we shutdown the debugging session,
// try to continue, or do something else?
LLDB_LOG(log,
"Error {0} occurred during debugging. Unexpected behavior "
"may result. {1}",
error.GetError(), error);
} else {
// If we haven't actually launched the process yet, this was an error
// launching the process. Set the internal error and signal the initial
// stop event so that the DoLaunch method wakes up and returns a failure.
m_session_data->m_launch_error = error;
::SetEvent(m_session_data->m_initial_stop_event);
LLDB_LOG(
log,
"Error {0} occurred launching the process before the initial stop. {1}",
error.GetError(), error);
return;
}
}
Status ProcessWindows::GetWatchpointSupportInfo(uint32_t &num) {
num = RegisterContextWindows::GetNumHardwareBreakpointSlots();
return {};
}
Status ProcessWindows::GetWatchpointSupportInfo(uint32_t &num, bool &after) {
num = RegisterContextWindows::GetNumHardwareBreakpointSlots();
after = RegisterContextWindows::DoHardwareBreakpointsTriggerAfter();
return {};
}
Status ProcessWindows::EnableWatchpoint(Watchpoint *wp, bool notify) {
Status error;
if (wp->IsEnabled()) {
wp->SetEnabled(true, notify);
return error;
}
WatchpointInfo info;
for (info.slot_id = 0;
info.slot_id < RegisterContextWindows::GetNumHardwareBreakpointSlots();
info.slot_id++)
if (m_watchpoint_ids[info.slot_id] == LLDB_INVALID_BREAK_ID)
break;
if (info.slot_id == RegisterContextWindows::GetNumHardwareBreakpointSlots()) {
error.SetErrorStringWithFormat("Can't find free slot for watchpoint %i",
wp->GetID());
return error;
}
info.address = wp->GetLoadAddress();
info.size = wp->GetByteSize();
info.read = wp->WatchpointRead();
info.write = wp->WatchpointWrite();
for (unsigned i = 0U; i < m_thread_list.GetSize(); i++) {
Thread *thread = m_thread_list.GetThreadAtIndex(i).get();
auto *reg_ctx = static_cast<RegisterContextWindows *>(
thread->GetRegisterContext().get());
if (!reg_ctx->AddHardwareBreakpoint(info.slot_id, info.address, info.size,
info.read, info.write)) {
error.SetErrorStringWithFormat(
"Can't enable watchpoint %i on thread 0x%llx", wp->GetID(),
thread->GetID());
break;
}
}
if (error.Fail()) {
for (unsigned i = 0U; i < m_thread_list.GetSize(); i++) {
Thread *thread = m_thread_list.GetThreadAtIndex(i).get();
auto *reg_ctx = static_cast<RegisterContextWindows *>(
thread->GetRegisterContext().get());
reg_ctx->RemoveHardwareBreakpoint(info.slot_id);
}
return error;
}
m_watchpoints[wp->GetID()] = info;
m_watchpoint_ids[info.slot_id] = wp->GetID();
wp->SetEnabled(true, notify);
return error;
}
Status ProcessWindows::DisableWatchpoint(Watchpoint *wp, bool notify) {
Status error;
if (!wp->IsEnabled()) {
wp->SetEnabled(false, notify);
return error;
}
auto it = m_watchpoints.find(wp->GetID());
if (it == m_watchpoints.end()) {
error.SetErrorStringWithFormat("Info about watchpoint %i is not found",
wp->GetID());
return error;
}
for (unsigned i = 0U; i < m_thread_list.GetSize(); i++) {
Thread *thread = m_thread_list.GetThreadAtIndex(i).get();
auto *reg_ctx = static_cast<RegisterContextWindows *>(
thread->GetRegisterContext().get());
if (!reg_ctx->RemoveHardwareBreakpoint(it->second.slot_id)) {
error.SetErrorStringWithFormat(
"Can't disable watchpoint %i on thread 0x%llx", wp->GetID(),
thread->GetID());
break;
}
}
if (error.Fail())
return error;
m_watchpoint_ids[it->second.slot_id] = LLDB_INVALID_BREAK_ID;
m_watchpoints.erase(it);
wp->SetEnabled(false, notify);
return error;
}
} // namespace lldb_private
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