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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#include "cmConfigure.h" // IWYU pragma: keep
#include "cmDebuggerAdapter.h"
#include <algorithm>
#include <climits>
#include <condition_variable>
#include <cstdint>
#include <functional>
#include <iostream>
#include <stdexcept>
#include <utility>
#include <cm/memory>
#include <cm/optional>
#include <cm3p/cppdap/io.h> // IWYU pragma: keep
#include <cm3p/cppdap/protocol.h>
#include <cm3p/cppdap/session.h>
#include "cmDebuggerBreakpointManager.h"
#include "cmDebuggerExceptionManager.h"
#include "cmDebuggerProtocol.h"
#include "cmDebuggerSourceBreakpoint.h" // IWYU pragma: keep
#include "cmDebuggerStackFrame.h"
#include "cmDebuggerThread.h"
#include "cmDebuggerThreadManager.h"
#include "cmListFileCache.h"
#include "cmMakefile.h"
#include "cmValue.h"
#include "cmVersionConfig.h"
#include <cmcppdap/include/dap/optional.h>
#include <cmcppdap/include/dap/types.h>
namespace cmDebugger {
// Event provides a basic wait and signal synchronization primitive.
class SyncEvent
{
public:
// Wait() blocks until the event is fired.
void Wait()
{
std::unique_lock<std::mutex> lock(Mutex);
Cv.wait(lock, [&] { return Fired; });
}
// Fire() sets signals the event, and unblocks any calls to Wait().
void Fire()
{
std::unique_lock<std::mutex> lock(Mutex);
Fired = true;
Cv.notify_all();
}
private:
std::mutex Mutex;
std::condition_variable Cv;
bool Fired = false;
};
class Semaphore
{
public:
Semaphore(int count_ = 0)
: Count(count_)
{
}
inline void Notify()
{
std::unique_lock<std::mutex> lock(Mutex);
Count++;
// notify the waiting thread
Cv.notify_one();
}
inline void Wait()
{
std::unique_lock<std::mutex> lock(Mutex);
while (Count == 0) {
// wait on the mutex until notify is called
Cv.wait(lock);
}
Count--;
}
private:
std::mutex Mutex;
std::condition_variable Cv;
int Count;
};
cmDebuggerAdapter::cmDebuggerAdapter(
std::shared_ptr<cmDebuggerConnection> connection,
std::string const& dapLogPath)
: cmDebuggerAdapter(std::move(connection),
dapLogPath.empty()
? cm::nullopt
: cm::optional<std::shared_ptr<dap::Writer>>(
dap::file(dapLogPath.c_str())))
{
}
cmDebuggerAdapter::cmDebuggerAdapter(
std::shared_ptr<cmDebuggerConnection> connection,
cm::optional<std::shared_ptr<dap::Writer>> logger)
: Connection(std::move(connection))
, SessionActive(true)
, DisconnectEvent(cm::make_unique<SyncEvent>())
, ConfigurationDoneEvent(cm::make_unique<SyncEvent>())
, ContinueSem(cm::make_unique<Semaphore>())
, ThreadManager(cm::make_unique<cmDebuggerThreadManager>())
{
if (logger.has_value()) {
SessionLog = std::move(logger.value());
}
ClearStepRequests();
Session = dap::Session::create();
BreakpointManager =
cm::make_unique<cmDebuggerBreakpointManager>(Session.get());
ExceptionManager =
cm::make_unique<cmDebuggerExceptionManager>(Session.get());
// Handle errors reported by the Session. These errors include protocol
// parsing errors and receiving messages with no handler.
Session->onError([this](const char* msg) {
if (SessionLog) {
dap::writef(SessionLog, "dap::Session error: %s\n", msg);
}
std::cout << "[CMake Debugger] DAP session error: " << msg << std::endl;
BreakpointManager->ClearAll();
ExceptionManager->ClearAll();
ClearStepRequests();
ContinueSem->Notify();
DisconnectEvent->Fire();
SessionActive.store(false);
});
// https://microsoft.github.io/debug-adapter-protocol/specification#Requests_Initialize
Session->registerHandler([this](const dap::CMakeInitializeRequest& req) {
SupportsVariableType = req.supportsVariableType.value(false);
dap::CMakeInitializeResponse response;
response.supportsConfigurationDoneRequest = true;
response.cmakeVersion.major = CMake_VERSION_MAJOR;
response.cmakeVersion.minor = CMake_VERSION_MINOR;
response.cmakeVersion.patch = CMake_VERSION_PATCH;
response.cmakeVersion.full = CMake_VERSION;
ExceptionManager->HandleInitializeRequest(response);
return response;
});
// https://microsoft.github.io/debug-adapter-protocol/specification#Events_Initialized
Session->registerSentHandler(
[&](const dap::ResponseOrError<dap::CMakeInitializeResponse>&) {
Session->send(dap::InitializedEvent());
});
// https://microsoft.github.io/debug-adapter-protocol/specification#Requests_Threads
Session->registerHandler([this](const dap::ThreadsRequest& req) {
(void)req;
std::unique_lock<std::mutex> lock(Mutex);
dap::ThreadsResponse response;
// If a client requests threads during shutdown (like after receiving the
// thread exited event), DefaultThread won't be set.
if (DefaultThread) {
dap::Thread thread;
thread.id = DefaultThread->GetId();
thread.name = DefaultThread->GetName();
response.threads.push_back(thread);
}
return response;
});
// https://microsoft.github.io/debug-adapter-protocol/specification#Requests_StackTrace
Session->registerHandler([this](const dap::StackTraceRequest& request)
-> dap::ResponseOrError<dap::StackTraceResponse> {
std::unique_lock<std::mutex> lock(Mutex);
cm::optional<dap::StackTraceResponse> response =
ThreadManager->GetThreadStackTraceResponse(request.threadId);
if (response.has_value()) {
return response.value();
}
return dap::Error("Unknown threadId '%d'", int(request.threadId));
});
// https://microsoft.github.io/debug-adapter-protocol/specification#Requests_Scopes
Session->registerHandler([this](const dap::ScopesRequest& request)
-> dap::ResponseOrError<dap::ScopesResponse> {
std::unique_lock<std::mutex> lock(Mutex);
return DefaultThread->GetScopesResponse(request.frameId,
SupportsVariableType);
});
// https://microsoft.github.io/debug-adapter-protocol/specification#Requests_Variables
Session->registerHandler([this](const dap::VariablesRequest& request)
-> dap::ResponseOrError<dap::VariablesResponse> {
return DefaultThread->GetVariablesResponse(request);
});
// https://microsoft.github.io/debug-adapter-protocol/specification#Requests_Pause
Session->registerHandler([this](const dap::PauseRequest& req) {
(void)req;
PauseRequest.store(true);
return dap::PauseResponse();
});
// https://microsoft.github.io/debug-adapter-protocol/specification#Requests_Continue
Session->registerHandler([this](const dap::ContinueRequest& req) {
(void)req;
ContinueSem->Notify();
return dap::ContinueResponse();
});
// https://microsoft.github.io/debug-adapter-protocol/specification#Requests_Next
Session->registerHandler([this](const dap::NextRequest& req) {
(void)req;
NextStepFrom.store(DefaultThread->GetStackFrameSize());
ContinueSem->Notify();
return dap::NextResponse();
});
// https://microsoft.github.io/debug-adapter-protocol/specification#Requests_StepIn
Session->registerHandler([this](const dap::StepInRequest& req) {
(void)req;
// This would stop after stepped in, single line stepped or stepped out.
StepInRequest.store(true);
ContinueSem->Notify();
return dap::StepInResponse();
});
// https://microsoft.github.io/debug-adapter-protocol/specification#Requests_StepOut
Session->registerHandler([this](const dap::StepOutRequest& req) {
(void)req;
StepOutDepth.store(DefaultThread->GetStackFrameSize() - 1);
ContinueSem->Notify();
return dap::StepOutResponse();
});
// https://microsoft.github.io/debug-adapter-protocol/specification#Requests_Launch
Session->registerHandler([](const dap::LaunchRequest& req) {
(void)req;
return dap::LaunchResponse();
});
// Handler for disconnect requests
Session->registerHandler([this](const dap::DisconnectRequest& request) {
(void)request;
BreakpointManager->ClearAll();
ExceptionManager->ClearAll();
ClearStepRequests();
ContinueSem->Notify();
DisconnectEvent->Fire();
SessionActive.store(false);
return dap::DisconnectResponse();
});
Session->registerHandler([this](const dap::EvaluateRequest& request) {
dap::EvaluateResponse response;
if (request.frameId.has_value()) {
std::shared_ptr<cmDebuggerStackFrame> frame =
DefaultThread->GetStackFrame(request.frameId.value());
auto var = frame->GetMakefile()->GetDefinition(request.expression);
if (var) {
response.type = "string";
response.result = var;
return response;
}
}
return response;
});
// The ConfigurationDone request is made by the client once all configuration
// requests have been made.
// https://microsoft.github.io/debug-adapter-protocol/specification#Requests_ConfigurationDone
Session->registerHandler([this](const dap::ConfigurationDoneRequest& req) {
(void)req;
ConfigurationDoneEvent->Fire();
return dap::ConfigurationDoneResponse();
});
std::string errorMessage;
if (!Connection->StartListening(errorMessage)) {
throw std::runtime_error(errorMessage);
}
// Connect to the client. Write a well-known message to stdout so that
// clients know it is safe to attempt to connect.
std::cout << "Waiting for debugger client to connect..." << std::endl;
Connection->WaitForConnection();
std::cout << "Debugger client connected." << std::endl;
if (SessionLog) {
Session->connect(spy(Connection->GetReader(), SessionLog),
spy(Connection->GetWriter(), SessionLog));
} else {
Session->connect(Connection->GetReader(), Connection->GetWriter());
}
// Start the processing thread.
SessionThread = std::thread([this] {
while (SessionActive.load()) {
if (auto payload = Session->getPayload()) {
payload();
}
}
});
ConfigurationDoneEvent->Wait();
DefaultThread = ThreadManager->StartThread("CMake script");
dap::ThreadEvent threadEvent;
threadEvent.reason = "started";
threadEvent.threadId = DefaultThread->GetId();
Session->send(threadEvent);
}
cmDebuggerAdapter::~cmDebuggerAdapter()
{
if (SessionThread.joinable()) {
SessionThread.join();
}
Session.reset(nullptr);
if (SessionLog) {
SessionLog->close();
}
}
void cmDebuggerAdapter::ReportExitCode(int exitCode)
{
ThreadManager->EndThread(DefaultThread);
dap::ThreadEvent threadEvent;
threadEvent.reason = "exited";
threadEvent.threadId = DefaultThread->GetId();
DefaultThread.reset();
dap::ExitedEvent exitEvent;
exitEvent.exitCode = exitCode;
dap::TerminatedEvent terminatedEvent;
if (SessionActive.load()) {
Session->send(threadEvent);
Session->send(exitEvent);
Session->send(terminatedEvent);
}
// Wait until disconnected or error.
DisconnectEvent->Wait();
}
void cmDebuggerAdapter::OnFileParsedSuccessfully(
std::string const& sourcePath,
std::vector<cmListFileFunction> const& functions)
{
BreakpointManager->SourceFileLoaded(sourcePath, functions);
}
void cmDebuggerAdapter::OnBeginFunctionCall(cmMakefile* mf,
std::string const& sourcePath,
cmListFileFunction const& lff)
{
std::unique_lock<std::mutex> lock(Mutex);
DefaultThread->PushStackFrame(mf, sourcePath, lff);
if (lff.Line() == 0) {
// File just loaded, continue to first valid function call.
return;
}
auto hits = BreakpointManager->GetBreakpoints(sourcePath, lff.Line());
lock.unlock();
bool waitSem = false;
dap::StoppedEvent stoppedEvent;
stoppedEvent.allThreadsStopped = true;
stoppedEvent.threadId = DefaultThread->GetId();
if (!hits.empty()) {
ClearStepRequests();
waitSem = true;
dap::array<dap::integer> hitBreakpoints;
hitBreakpoints.resize(hits.size());
std::transform(hits.begin(), hits.end(), hitBreakpoints.begin(),
[&](const int64_t& id) { return dap::integer(id); });
stoppedEvent.reason = "breakpoint";
stoppedEvent.hitBreakpointIds = hitBreakpoints;
}
if (long(DefaultThread->GetStackFrameSize()) <= NextStepFrom.load() ||
StepInRequest.load() ||
long(DefaultThread->GetStackFrameSize()) <= StepOutDepth.load()) {
ClearStepRequests();
waitSem = true;
stoppedEvent.reason = "step";
}
if (PauseRequest.load()) {
ClearStepRequests();
waitSem = true;
stoppedEvent.reason = "pause";
}
if (waitSem) {
Session->send(stoppedEvent);
ContinueSem->Wait();
}
}
void cmDebuggerAdapter::OnEndFunctionCall()
{
DefaultThread->PopStackFrame();
}
static std::shared_ptr<cmListFileFunction> listFileFunction;
void cmDebuggerAdapter::OnBeginFileParse(cmMakefile* mf,
std::string const& sourcePath)
{
std::unique_lock<std::mutex> lock(Mutex);
listFileFunction = std::make_shared<cmListFileFunction>(
sourcePath, 0, 0, std::vector<cmListFileArgument>());
DefaultThread->PushStackFrame(mf, sourcePath, *listFileFunction);
}
void cmDebuggerAdapter::OnEndFileParse()
{
DefaultThread->PopStackFrame();
listFileFunction = nullptr;
}
void cmDebuggerAdapter::OnMessageOutput(MessageType t, std::string const& text)
{
cm::optional<dap::StoppedEvent> stoppedEvent =
ExceptionManager->RaiseExceptionIfAny(t, text);
if (stoppedEvent.has_value()) {
stoppedEvent->threadId = DefaultThread->GetId();
Session->send(*stoppedEvent);
ContinueSem->Wait();
}
}
void cmDebuggerAdapter::ClearStepRequests()
{
NextStepFrom.store(INT_MIN);
StepInRequest.store(false);
StepOutDepth.store(INT_MIN);
PauseRequest.store(false);
}
} // namespace cmDebugger
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