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DAP.cpp
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//===-- DAP.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 "DAP.h"
#include "DAPLog.h"
#include "Handler/RequestHandler.h"
#include "Handler/ResponseHandler.h"
#include "JSONUtils.h"
#include "LLDBUtils.h"
#include "OutputRedirector.h"
#include "Protocol/ProtocolBase.h"
#include "Protocol/ProtocolRequests.h"
#include "Protocol/ProtocolTypes.h"
#include "Transport.h"
#include "lldb/API/SBBreakpoint.h"
#include "lldb/API/SBCommandInterpreter.h"
#include "lldb/API/SBCommandReturnObject.h"
#include "lldb/API/SBLanguageRuntime.h"
#include "lldb/API/SBListener.h"
#include "lldb/API/SBProcess.h"
#include "lldb/API/SBStream.h"
#include "lldb/Utility/IOObject.h"
#include "lldb/Utility/Status.h"
#include "lldb/lldb-defines.h"
#include "lldb/lldb-enumerations.h"
#include "lldb/lldb-types.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/ScopeExit.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FormatVariadic.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cassert>
#include <chrono>
#include <condition_variable>
#include <cstdarg>
#include <cstdio>
#include <fstream>
#include <future>
#include <memory>
#include <mutex>
#include <optional>
#include <string>
#include <utility>
#include <variant>
#if defined(_WIN32)
#define NOMINMAX
#include <fcntl.h>
#include <io.h>
#include <windows.h>
#else
#include <unistd.h>
#endif
using namespace lldb_dap;
using namespace lldb_dap::protocol;
namespace {
#ifdef _WIN32
const char DEV_NULL[] = "nul";
#else
const char DEV_NULL[] = "/dev/null";
#endif
} // namespace
namespace lldb_dap {
llvm::StringRef DAP::debug_adapter_path = "";
DAP::DAP(Log *log, const ReplMode default_repl_mode,
std::vector<std::string> pre_init_commands, Transport &transport)
: log(log), transport(transport), broadcaster("lldb-dap"),
exception_breakpoints(), focus_tid(LLDB_INVALID_THREAD_ID),
stop_at_entry(false), is_attach(false),
restarting_process_id(LLDB_INVALID_PROCESS_ID),
configuration_done_sent(false), waiting_for_run_in_terminal(false),
progress_event_reporter(
[&](const ProgressEvent &event) { SendJSON(event.ToJSON()); }),
reverse_request_seq(0), repl_mode(default_repl_mode) {
configuration.preInitCommands = std::move(pre_init_commands);
}
DAP::~DAP() = default;
/// Return string with first character capitalized.
static std::string capitalize(llvm::StringRef str) {
if (str.empty())
return "";
return ((llvm::Twine)llvm::toUpper(str[0]) + str.drop_front()).str();
}
void DAP::PopulateExceptionBreakpoints() {
llvm::call_once(init_exception_breakpoints_flag, [this]() {
exception_breakpoints = std::vector<ExceptionBreakpoint>{};
if (lldb::SBDebugger::SupportsLanguage(lldb::eLanguageTypeC_plus_plus)) {
exception_breakpoints->emplace_back(*this, "cpp_catch", "C++ Catch",
lldb::eLanguageTypeC_plus_plus);
exception_breakpoints->emplace_back(*this, "cpp_throw", "C++ Throw",
lldb::eLanguageTypeC_plus_plus);
}
if (lldb::SBDebugger::SupportsLanguage(lldb::eLanguageTypeObjC)) {
exception_breakpoints->emplace_back(
*this, "objc_catch", "Objective-C Catch", lldb::eLanguageTypeObjC);
exception_breakpoints->emplace_back(
*this, "objc_throw", "Objective-C Throw", lldb::eLanguageTypeObjC);
}
if (lldb::SBDebugger::SupportsLanguage(lldb::eLanguageTypeSwift)) {
exception_breakpoints->emplace_back(*this, "swift_catch", "Swift Catch",
lldb::eLanguageTypeSwift);
exception_breakpoints->emplace_back(*this, "swift_throw", "Swift Throw",
lldb::eLanguageTypeSwift);
}
// Besides handling the hardcoded list of languages from above, we try to
// find any other languages that support exception breakpoints using the
// SB API.
for (int raw_lang = lldb::eLanguageTypeUnknown;
raw_lang < lldb::eNumLanguageTypes; ++raw_lang) {
lldb::LanguageType lang = static_cast<lldb::LanguageType>(raw_lang);
// We first discard any languages already handled above.
if (lldb::SBLanguageRuntime::LanguageIsCFamily(lang) ||
lang == lldb::eLanguageTypeSwift)
continue;
if (!lldb::SBDebugger::SupportsLanguage(lang))
continue;
const char *name = lldb::SBLanguageRuntime::GetNameForLanguageType(lang);
if (!name)
continue;
std::string raw_lang_name = name;
std::string capitalized_lang_name = capitalize(name);
if (lldb::SBLanguageRuntime::SupportsExceptionBreakpointsOnThrow(lang)) {
const char *raw_throw_keyword =
lldb::SBLanguageRuntime::GetThrowKeywordForLanguage(lang);
std::string throw_keyword =
raw_throw_keyword ? raw_throw_keyword : "throw";
exception_breakpoints->emplace_back(
*this, raw_lang_name + "_" + throw_keyword,
capitalized_lang_name + " " + capitalize(throw_keyword), lang);
}
if (lldb::SBLanguageRuntime::SupportsExceptionBreakpointsOnCatch(lang)) {
const char *raw_catch_keyword =
lldb::SBLanguageRuntime::GetCatchKeywordForLanguage(lang);
std::string catch_keyword =
raw_catch_keyword ? raw_catch_keyword : "catch";
exception_breakpoints->emplace_back(
*this, raw_lang_name + "_" + catch_keyword,
capitalized_lang_name + " " + capitalize(catch_keyword), lang);
}
}
assert(!exception_breakpoints->empty() && "should not be empty");
});
}
ExceptionBreakpoint *DAP::GetExceptionBreakpoint(llvm::StringRef filter) {
// PopulateExceptionBreakpoints() is called after g_dap.debugger is created
// in a request-initialize.
//
// But this GetExceptionBreakpoint() method may be called before attaching, in
// which case, we may not have populated the filter yet.
//
// We also cannot call PopulateExceptionBreakpoints() in DAP::DAP() because
// we need SBDebugger::Initialize() to have been called before this.
//
// So just calling PopulateExceptionBreakoints(),which does lazy-populating
// seems easiest. Two other options include:
// + call g_dap.PopulateExceptionBreakpoints() in lldb-dap.cpp::main()
// right after the call to SBDebugger::Initialize()
// + Just call PopulateExceptionBreakpoints() to get a fresh list everytime
// we query (a bit overkill since it's not likely to change?)
PopulateExceptionBreakpoints();
for (auto &bp : *exception_breakpoints) {
if (bp.GetFilter() == filter)
return &bp;
}
return nullptr;
}
ExceptionBreakpoint *DAP::GetExceptionBreakpoint(const lldb::break_id_t bp_id) {
// See comment in the other GetExceptionBreakpoint().
PopulateExceptionBreakpoints();
for (auto &bp : *exception_breakpoints) {
if (bp.GetID() == bp_id)
return &bp;
}
return nullptr;
}
llvm::Error DAP::ConfigureIO(std::FILE *overrideOut, std::FILE *overrideErr) {
in = lldb::SBFile(std::fopen(DEV_NULL, "r"), /*transfer_ownership=*/true);
if (auto Error = out.RedirectTo(overrideOut, [this](llvm::StringRef output) {
SendOutput(OutputType::Stdout, output);
}))
return Error;
if (auto Error = err.RedirectTo(overrideErr, [this](llvm::StringRef output) {
SendOutput(OutputType::Stderr, output);
}))
return Error;
return llvm::Error::success();
}
void DAP::StopEventHandlers() {
if (event_thread.joinable()) {
broadcaster.BroadcastEventByType(eBroadcastBitStopEventThread);
event_thread.join();
}
if (progress_event_thread.joinable()) {
broadcaster.BroadcastEventByType(eBroadcastBitStopProgressThread);
progress_event_thread.join();
}
}
// Serialize the JSON value into a string and send the JSON packet to
// the "out" stream.
void DAP::SendJSON(const llvm::json::Value &json) {
// FIXME: Instead of parsing the output message from JSON, pass the `Message`
// as parameter to `SendJSON`.
Message message;
llvm::json::Path::Root root;
if (!fromJSON(json, message, root)) {
DAP_LOG_ERROR(log, root.getError(), "({1}) encoding failed: {0}",
transport.GetClientName());
return;
}
Send(message);
}
void DAP::Send(const Message &message) {
// FIXME: After all the requests have migrated from LegacyRequestHandler >
// RequestHandler<> this should be handled in RequestHandler<>::operator().
if (auto *resp = std::get_if<Response>(&message);
resp && debugger.InterruptRequested()) {
// Clear the interrupt request.
debugger.CancelInterruptRequest();
// If the debugger was interrupted, convert this response into a 'cancelled'
// response because we might have a partial result.
Response cancelled{/*request_seq=*/resp->request_seq,
/*command=*/resp->command,
/*success=*/false,
/*message=*/eResponseMessageCancelled,
/*body=*/std::nullopt};
if (llvm::Error err = transport.Write(cancelled))
DAP_LOG_ERROR(log, std::move(err), "({1}) write failed: {0}",
transport.GetClientName());
return;
}
if (llvm::Error err = transport.Write(message))
DAP_LOG_ERROR(log, std::move(err), "({1}) write failed: {0}",
transport.GetClientName());
}
// "OutputEvent": {
// "allOf": [ { "$ref": "#/definitions/Event" }, {
// "type": "object",
// "description": "Event message for 'output' event type. The event
// indicates that the target has produced some output.",
// "properties": {
// "event": {
// "type": "string",
// "enum": [ "output" ]
// },
// "body": {
// "type": "object",
// "properties": {
// "category": {
// "type": "string",
// "description": "The output category. If not specified,
// 'console' is assumed.",
// "_enum": [ "console", "stdout", "stderr", "telemetry" ]
// },
// "output": {
// "type": "string",
// "description": "The output to report."
// },
// "variablesReference": {
// "type": "number",
// "description": "If an attribute 'variablesReference' exists
// and its value is > 0, the output contains
// objects which can be retrieved by passing
// variablesReference to the VariablesRequest."
// },
// "source": {
// "$ref": "#/definitions/Source",
// "description": "An optional source location where the output
// was produced."
// },
// "line": {
// "type": "integer",
// "description": "An optional source location line where the
// output was produced."
// },
// "column": {
// "type": "integer",
// "description": "An optional source location column where the
// output was produced."
// },
// "data": {
// "type":["array","boolean","integer","null","number","object",
// "string"],
// "description": "Optional data to report. For the 'telemetry'
// category the data will be sent to telemetry, for
// the other categories the data is shown in JSON
// format."
// }
// },
// "required": ["output"]
// }
// },
// "required": [ "event", "body" ]
// }]
// }
void DAP::SendOutput(OutputType o, const llvm::StringRef output) {
if (output.empty())
return;
const char *category = nullptr;
switch (o) {
case OutputType::Console:
category = "console";
break;
case OutputType::Stdout:
category = "stdout";
break;
case OutputType::Stderr:
category = "stderr";
break;
case OutputType::Telemetry:
category = "telemetry";
break;
}
// Send each line of output as an individual event, including the newline if
// present.
::size_t idx = 0;
do {
::size_t end = output.find('\n', idx);
if (end == llvm::StringRef::npos)
end = output.size() - 1;
llvm::json::Object event(CreateEventObject("output"));
llvm::json::Object body;
body.try_emplace("category", category);
EmplaceSafeString(body, "output", output.slice(idx, end + 1).str());
event.try_emplace("body", std::move(body));
SendJSON(llvm::json::Value(std::move(event)));
idx = end + 1;
} while (idx < output.size());
}
// interface ProgressStartEvent extends Event {
// event: 'progressStart';
//
// body: {
// /**
// * An ID that must be used in subsequent 'progressUpdate' and
// 'progressEnd'
// * events to make them refer to the same progress reporting.
// * IDs must be unique within a debug session.
// */
// progressId: string;
//
// /**
// * Mandatory (short) title of the progress reporting. Shown in the UI to
// * describe the long running operation.
// */
// title: string;
//
// /**
// * The request ID that this progress report is related to. If specified a
// * debug adapter is expected to emit
// * progress events for the long running request until the request has
// been
// * either completed or cancelled.
// * If the request ID is omitted, the progress report is assumed to be
// * related to some general activity of the debug adapter.
// */
// requestId?: number;
//
// /**
// * If true, the request that reports progress may be canceled with a
// * 'cancel' request.
// * So this property basically controls whether the client should use UX
// that
// * supports cancellation.
// * Clients that don't support cancellation are allowed to ignore the
// * setting.
// */
// cancellable?: boolean;
//
// /**
// * Optional, more detailed progress message.
// */
// message?: string;
//
// /**
// * Optional progress percentage to display (value range: 0 to 100). If
// * omitted no percentage will be shown.
// */
// percentage?: number;
// };
// }
//
// interface ProgressUpdateEvent extends Event {
// event: 'progressUpdate';
//
// body: {
// /**
// * The ID that was introduced in the initial 'progressStart' event.
// */
// progressId: string;
//
// /**
// * Optional, more detailed progress message. If omitted, the previous
// * message (if any) is used.
// */
// message?: string;
//
// /**
// * Optional progress percentage to display (value range: 0 to 100). If
// * omitted no percentage will be shown.
// */
// percentage?: number;
// };
// }
//
// interface ProgressEndEvent extends Event {
// event: 'progressEnd';
//
// body: {
// /**
// * The ID that was introduced in the initial 'ProgressStartEvent'.
// */
// progressId: string;
//
// /**
// * Optional, more detailed progress message. If omitted, the previous
// * message (if any) is used.
// */
// message?: string;
// };
// }
void DAP::SendProgressEvent(uint64_t progress_id, const char *message,
uint64_t completed, uint64_t total) {
progress_event_reporter.Push(progress_id, message, completed, total);
}
void __attribute__((format(printf, 3, 4)))
DAP::SendFormattedOutput(OutputType o, const char *format, ...) {
char buffer[1024];
va_list args;
va_start(args, format);
int actual_length = vsnprintf(buffer, sizeof(buffer), format, args);
va_end(args);
SendOutput(
o, llvm::StringRef(buffer, std::min<int>(actual_length, sizeof(buffer))));
}
ExceptionBreakpoint *DAP::GetExceptionBPFromStopReason(lldb::SBThread &thread) {
const auto num = thread.GetStopReasonDataCount();
// Check to see if have hit an exception breakpoint and change the
// reason to "exception", but only do so if all breakpoints that were
// hit are exception breakpoints.
ExceptionBreakpoint *exc_bp = nullptr;
for (size_t i = 0; i < num; i += 2) {
// thread.GetStopReasonDataAtIndex(i) will return the bp ID and
// thread.GetStopReasonDataAtIndex(i+1) will return the location
// within that breakpoint. We only care about the bp ID so we can
// see if this is an exception breakpoint that is getting hit.
lldb::break_id_t bp_id = thread.GetStopReasonDataAtIndex(i);
exc_bp = GetExceptionBreakpoint(bp_id);
// If any breakpoint is not an exception breakpoint, then stop and
// report this as a normal breakpoint
if (exc_bp == nullptr)
return nullptr;
}
return exc_bp;
}
lldb::SBThread DAP::GetLLDBThread(lldb::tid_t tid) {
return target.GetProcess().GetThreadByID(tid);
}
lldb::SBThread DAP::GetLLDBThread(const llvm::json::Object &arguments) {
auto tid = GetInteger<int64_t>(arguments, "threadId")
.value_or(LLDB_INVALID_THREAD_ID);
return target.GetProcess().GetThreadByID(tid);
}
lldb::SBFrame DAP::GetLLDBFrame(const llvm::json::Object &arguments) {
const uint64_t frame_id =
GetInteger<uint64_t>(arguments, "frameId").value_or(UINT64_MAX);
lldb::SBProcess process = target.GetProcess();
// Upper 32 bits is the thread index ID
lldb::SBThread thread =
process.GetThreadByIndexID(GetLLDBThreadIndexID(frame_id));
// Lower 32 bits is the frame index
return thread.GetFrameAtIndex(GetLLDBFrameID(frame_id));
}
llvm::json::Value DAP::CreateTopLevelScopes() {
llvm::json::Array scopes;
scopes.emplace_back(
CreateScope("Locals", VARREF_LOCALS, variables.locals.GetSize(), false));
scopes.emplace_back(CreateScope("Globals", VARREF_GLOBALS,
variables.globals.GetSize(), false));
scopes.emplace_back(CreateScope("Registers", VARREF_REGS,
variables.registers.GetSize(), false));
return llvm::json::Value(std::move(scopes));
}
ReplMode DAP::DetectReplMode(lldb::SBFrame frame, std::string &expression,
bool partial_expression) {
// Check for the escape hatch prefix.
if (!expression.empty() &&
llvm::StringRef(expression)
.starts_with(configuration.commandEscapePrefix)) {
expression = expression.substr(configuration.commandEscapePrefix.size());
return ReplMode::Command;
}
switch (repl_mode) {
case ReplMode::Variable:
return ReplMode::Variable;
case ReplMode::Command:
return ReplMode::Command;
case ReplMode::Auto:
// To determine if the expression is a command or not, check if the first
// term is a variable or command. If it's a variable in scope we will prefer
// that behavior and give a warning to the user if they meant to invoke the
// operation as a command.
//
// Example use case:
// int p and expression "p + 1" > variable
// int i and expression "i" > variable
// int var and expression "va" > command
std::pair<llvm::StringRef, llvm::StringRef> token =
llvm::getToken(expression);
// If the first token is not fully finished yet, we can't
// determine whether this will be a variable or a lldb command.
if (partial_expression && token.second.empty())
return ReplMode::Auto;
std::string term = token.first.str();
lldb::SBCommandInterpreter interpreter = debugger.GetCommandInterpreter();
bool term_is_command = interpreter.CommandExists(term.c_str()) ||
interpreter.UserCommandExists(term.c_str()) ||
interpreter.AliasExists(term.c_str());
bool term_is_variable = frame.FindVariable(term.c_str()).IsValid();
// If we have both a variable and command, warn the user about the conflict.
if (term_is_command && term_is_variable) {
llvm::errs()
<< "Warning: Expression '" << term
<< "' is both an LLDB command and variable. It will be evaluated as "
"a variable. To evaluate the expression as an LLDB command, use '"
<< configuration.commandEscapePrefix << "' as a prefix.\n";
}
// Variables take preference to commands in auto, since commands can always
// be called using the command_escape_prefix
return term_is_variable ? ReplMode::Variable
: term_is_command ? ReplMode::Command
: ReplMode::Variable;
}
llvm_unreachable("enum cases exhausted.");
}
bool DAP::RunLLDBCommands(llvm::StringRef prefix,
llvm::ArrayRef<std::string> commands) {
bool required_command_failed = false;
std::string output =
::RunLLDBCommands(debugger, prefix, commands, required_command_failed);
SendOutput(OutputType::Console, output);
return !required_command_failed;
}
static llvm::Error createRunLLDBCommandsErrorMessage(llvm::StringRef category) {
return llvm::createStringError(
llvm::inconvertibleErrorCode(),
llvm::formatv(
"Failed to run {0} commands. See the Debug Console for more details.",
category)
.str()
.c_str());
}
llvm::Error
DAP::RunAttachCommands(llvm::ArrayRef<std::string> attach_commands) {
if (!RunLLDBCommands("Running attachCommands:", attach_commands))
return createRunLLDBCommandsErrorMessage("attach");
return llvm::Error::success();
}
llvm::Error
DAP::RunLaunchCommands(llvm::ArrayRef<std::string> launch_commands) {
if (!RunLLDBCommands("Running launchCommands:", launch_commands))
return createRunLLDBCommandsErrorMessage("launch");
return llvm::Error::success();
}
llvm::Error DAP::RunInitCommands() {
if (!RunLLDBCommands("Running initCommands:", configuration.initCommands))
return createRunLLDBCommandsErrorMessage("initCommands");
return llvm::Error::success();
}
llvm::Error DAP::RunPreInitCommands() {
if (!RunLLDBCommands("Running preInitCommands:",
configuration.preInitCommands))
return createRunLLDBCommandsErrorMessage("preInitCommands");
return llvm::Error::success();
}
llvm::Error DAP::RunPreRunCommands() {
if (!RunLLDBCommands("Running preRunCommands:", configuration.preRunCommands))
return createRunLLDBCommandsErrorMessage("preRunCommands");
return llvm::Error::success();
}
void DAP::RunPostRunCommands() {
RunLLDBCommands("Running postRunCommands:", configuration.postRunCommands);
}
void DAP::RunStopCommands() {
RunLLDBCommands("Running stopCommands:", configuration.stopCommands);
}
void DAP::RunExitCommands() {
RunLLDBCommands("Running exitCommands:", configuration.exitCommands);
}
void DAP::RunTerminateCommands() {
RunLLDBCommands("Running terminateCommands:",
configuration.terminateCommands);
}
lldb::SBTarget
DAP::CreateTargetFromArguments(const llvm::json::Object &arguments,
lldb::SBError &error) {
// Grab the name of the program we need to debug and create a target using
// the given program as an argument. Executable file can be a source of target
// architecture and platform, if they differ from the host. Setting exe path
// in launch info is useless because Target.Launch() will not change
// architecture and platform, therefore they should be known at the target
// creation. We also use target triple and platform from the launch
// configuration, if given, since in some cases ELF file doesn't contain
// enough information to determine correct arch and platform (or ELF can be
// omitted at all), so it is good to leave the user an apportunity to specify
// those. Any of those three can be left empty.
const llvm::StringRef target_triple =
GetString(arguments, "targetTriple").value_or("");
const llvm::StringRef platform_name =
GetString(arguments, "platformName").value_or("");
const llvm::StringRef program = GetString(arguments, "program").value_or("");
auto target = this->debugger.CreateTarget(
program.data(), target_triple.data(), platform_name.data(),
true, // Add dependent modules.
error);
if (error.Fail()) {
// Update message if there was an error.
error.SetErrorStringWithFormat(
"Could not create a target for a program '%s': %s.", program.data(),
error.GetCString());
}
return target;
}
void DAP::SetTarget(const lldb::SBTarget target) {
this->target = target;
if (target.IsValid()) {
// Configure breakpoint event listeners for the target.
lldb::SBListener listener = this->debugger.GetListener();
listener.StartListeningForEvents(
this->target.GetBroadcaster(),
lldb::SBTarget::eBroadcastBitBreakpointChanged);
listener.StartListeningForEvents(this->broadcaster,
eBroadcastBitStopEventThread);
}
}
bool DAP::HandleObject(const Message &M) {
TelemetryDispatcher dispatcher(&debugger);
dispatcher.Set("client_name", transport.GetClientName().str());
if (const auto *req = std::get_if<Request>(&M)) {
{
std::lock_guard<std::mutex> guard(m_active_request_mutex);
m_active_request = req;
// Clear the interrupt request prior to invoking a handler.
if (debugger.InterruptRequested())
debugger.CancelInterruptRequest();
}
auto cleanup = llvm::make_scope_exit([&]() {
std::scoped_lock<std::mutex> active_request_lock(m_active_request_mutex);
m_active_request = nullptr;
});
auto handler_pos = request_handlers.find(req->command);
dispatcher.Set("client_data",
llvm::Twine("request_command:", req->command).str());
if (handler_pos != request_handlers.end()) {
handler_pos->second->Run(*req);
return true; // Success
}
dispatcher.Set("error",
llvm::Twine("unhandled-command:" + req->command).str());
DAP_LOG(log, "({0}) error: unhandled command '{1}'",
transport.GetClientName(), req->command);
return false; // Fail
}
if (const auto *resp = std::get_if<Response>(&M)) {
std::unique_ptr<ResponseHandler> response_handler;
{
std::lock_guard<std::mutex> guard(call_mutex);
auto inflight = inflight_reverse_requests.find(resp->request_seq);
if (inflight != inflight_reverse_requests.end()) {
response_handler = std::move(inflight->second);
inflight_reverse_requests.erase(inflight);
}
}
if (!response_handler)
response_handler =
std::make_unique<UnknownResponseHandler>("", resp->request_seq);
// Result should be given, use null if not.
if (resp->success) {
(*response_handler)(resp->body);
dispatcher.Set("client_data",
llvm::Twine("response_command:", resp->command).str());
} else {
llvm::StringRef message = "Unknown error, response failed";
if (resp->message) {
message =
std::visit(llvm::makeVisitor(
[](const std::string &message) -> llvm::StringRef {
return message;
},
[](const protocol::ResponseMessage &message)
-> llvm::StringRef {
switch (message) {
case protocol::eResponseMessageCancelled:
return "cancelled";
case protocol::eResponseMessageNotStopped:
return "notStopped";
}
llvm_unreachable("unknown response message kind.");
}),
*resp->message);
}
dispatcher.Set("error", message.str());
(*response_handler)(llvm::createStringError(
std::error_code(-1, std::generic_category()), message));
}
return true;
}
dispatcher.Set("error", "Unsupported protocol message");
DAP_LOG(log, "Unsupported protocol message");
return false;
}
void DAP::SendTerminatedEvent() {
// Prevent races if the process exits while we're being asked to disconnect.
llvm::call_once(terminated_event_flag, [&] {
RunTerminateCommands();
// Send a "terminated" event
llvm::json::Object event(CreateTerminatedEventObject(target));
SendJSON(llvm::json::Value(std::move(event)));
});
}
llvm::Error DAP::Disconnect() { return Disconnect(is_attach); }
llvm::Error DAP::Disconnect(bool terminateDebuggee) {
lldb::SBError error;
lldb::SBProcess process = target.GetProcess();
auto state = process.GetState();
switch (state) {
case lldb::eStateInvalid:
case lldb::eStateUnloaded:
case lldb::eStateDetached:
case lldb::eStateExited:
break;
case lldb::eStateConnected:
case lldb::eStateAttaching:
case lldb::eStateLaunching:
case lldb::eStateStepping:
case lldb::eStateCrashed:
case lldb::eStateSuspended:
case lldb::eStateStopped:
case lldb::eStateRunning:
debugger.SetAsync(false);
error = terminateDebuggee ? process.Kill() : process.Detach();
debugger.SetAsync(true);
break;
}
SendTerminatedEvent();
disconnecting = true;
return ToError(error);
}
bool DAP::IsCancelled(const protocol::Request &req) {
std::lock_guard<std::mutex> guard(m_cancelled_requests_mutex);
return m_cancelled_requests.contains(req.seq);
}
void DAP::ClearCancelRequest(const CancelArguments &args) {
std::lock_guard<std::mutex> guard(m_cancelled_requests_mutex);
if (args.requestId)
m_cancelled_requests.erase(*args.requestId);
}
template <typename T>
static std::optional<T> getArgumentsIfRequest(const Message &pm,
llvm::StringLiteral command) {
auto *const req = std::get_if<Request>(&pm);
if (!req || req->command != command)
return std::nullopt;
T args;
llvm::json::Path::Root root;
if (!fromJSON(req->arguments, args, root)) {
return std::nullopt;
}
return std::move(args);
}
llvm::Error DAP::Loop() {
std::future<llvm::Error> queue_reader =
std::async(std::launch::async, [&]() -> llvm::Error {
llvm::set_thread_name(transport.GetClientName() + ".transport_handler");
auto cleanup = llvm::make_scope_exit([&]() {
// Ensure we're marked as disconnecting when the reader exits.
disconnecting = true;
m_queue_cv.notify_all();
});
while (!disconnecting) {
llvm::Expected<Message> next =
transport.Read(std::chrono::seconds(1));
if (next.errorIsA<EndOfFileError>()) {
consumeError(next.takeError());
break;
}
// If the read timed out, continue to check if we should disconnect.
if (next.errorIsA<TimeoutError>()) {
consumeError(next.takeError());
continue;
}
if (llvm::Error err = next.takeError())
return err;
if (const protocol::Request *req =
std::get_if<protocol::Request>(&*next);
req && req->command == "disconnect") {
disconnecting = true;
}
const std::optional<CancelArguments> cancel_args =
getArgumentsIfRequest<CancelArguments>(*next, "cancel");
if (cancel_args) {
{
std::lock_guard<std::mutex> guard(m_cancelled_requests_mutex);
if (cancel_args->requestId)
m_cancelled_requests.insert(*cancel_args->requestId);
}
// If a cancel is requested for the active request, make a best
// effort attempt to interrupt.
std::lock_guard<std::mutex> guard(m_active_request_mutex);
if (m_active_request &&
cancel_args->requestId == m_active_request->seq) {
DAP_LOG(
log,
"({0}) interrupting inflight request (command={1} seq={2})",
transport.GetClientName(), m_active_request->command,
m_active_request->seq);
debugger.RequestInterrupt();
}
}
{
std::lock_guard<std::mutex> guard(m_queue_mutex);
m_queue.push_back(std::move(*next));
}
m_queue_cv.notify_one();
}
return llvm::Error::success();
});
auto cleanup = llvm::make_scope_exit([&]() {
out.Stop();
err.Stop();
StopEventHandlers();
});
while (!disconnecting || !m_queue.empty()) {
std::unique_lock<std::mutex> lock(m_queue_mutex);
m_queue_cv.wait(lock, [&] { return disconnecting || !m_queue.empty(); });
if (m_queue.empty())
break;
Message next = m_queue.front();
m_queue.pop_front();
if (!HandleObject(next))
return llvm::createStringError(llvm::inconvertibleErrorCode(),
"unhandled packet");
}
return queue_reader.get();
}
lldb::SBError DAP::WaitForProcessToStop(uint32_t seconds) {
lldb::SBError error;
lldb::SBProcess process = target.GetProcess();
if (!process.IsValid()) {
error.SetErrorString("invalid process");
return error;
}
auto timeout_time =
std::chrono::steady_clock::now() + std::chrono::seconds(seconds);
while (std::chrono::steady_clock::now() < timeout_time) {
const auto state = process.GetState();
switch (state) {
case lldb::eStateAttaching:
case lldb::eStateConnected:
case lldb::eStateInvalid:
case lldb::eStateLaunching:
case lldb::eStateRunning:
case lldb::eStateStepping:
case lldb::eStateSuspended:
break;
case lldb::eStateDetached:
error.SetErrorString("process detached during launch or attach");
return error;
case lldb::eStateExited:
error.SetErrorString("process exited during launch or attach");
return error;
case lldb::eStateUnloaded:
error.SetErrorString("process unloaded during launch or attach");
return error;
case lldb::eStateCrashed:
case lldb::eStateStopped:
return lldb::SBError(); // Success!
}
std::this_thread::sleep_for(std::chrono::microseconds(250));
}
error.SetErrorStringWithFormat("process failed to stop within %u seconds",
seconds);
return error;
}
void Variables::Clear() {
locals.Clear();
globals.Clear();
registers.Clear();