forked from OSchip/llvm-project
650 lines
20 KiB
C++
650 lines
20 KiB
C++
//===-- IOHandler.cpp -----------------------------------------------------===//
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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/Core/IOHandler.h"
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#if defined(__APPLE__)
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#include <deque>
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#endif
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#include <string>
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#include "lldb/Core/Debugger.h"
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#include "lldb/Core/StreamFile.h"
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#include "lldb/Host/Config.h"
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#include "lldb/Host/File.h"
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#include "lldb/Utility/AnsiTerminal.h"
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#include "lldb/Utility/Predicate.h"
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#include "lldb/Utility/ReproducerProvider.h"
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#include "lldb/Utility/Status.h"
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#include "lldb/Utility/StreamString.h"
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#include "lldb/Utility/StringList.h"
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#include "lldb/lldb-forward.h"
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#if LLDB_ENABLE_LIBEDIT
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#include "lldb/Host/Editline.h"
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#endif
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#include "lldb/Interpreter/CommandCompletions.h"
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#include "lldb/Interpreter/CommandInterpreter.h"
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#include "llvm/ADT/StringRef.h"
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#ifdef _WIN32
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#include "lldb/Host/windows/windows.h"
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#endif
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#include <memory>
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#include <mutex>
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#include <cassert>
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#include <cctype>
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#include <cerrno>
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#include <clocale>
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#include <cstdint>
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#include <cstdio>
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#include <cstring>
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#include <type_traits>
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using namespace lldb;
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using namespace lldb_private;
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using llvm::None;
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using llvm::Optional;
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using llvm::StringRef;
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IOHandler::IOHandler(Debugger &debugger, IOHandler::Type type)
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: IOHandler(debugger, type,
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FileSP(), // Adopt STDIN from top input reader
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StreamFileSP(), // Adopt STDOUT from top input reader
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StreamFileSP(), // Adopt STDERR from top input reader
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0, // Flags
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nullptr // Shadow file recorder
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) {}
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IOHandler::IOHandler(Debugger &debugger, IOHandler::Type type,
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const lldb::FileSP &input_sp,
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const lldb::StreamFileSP &output_sp,
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const lldb::StreamFileSP &error_sp, uint32_t flags,
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repro::DataRecorder *data_recorder)
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: m_debugger(debugger), m_input_sp(input_sp), m_output_sp(output_sp),
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m_error_sp(error_sp), m_data_recorder(data_recorder), m_popped(false),
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m_flags(flags), m_type(type), m_user_data(nullptr), m_done(false),
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m_active(false) {
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// If any files are not specified, then adopt them from the top input reader.
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if (!m_input_sp || !m_output_sp || !m_error_sp)
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debugger.AdoptTopIOHandlerFilesIfInvalid(m_input_sp, m_output_sp,
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m_error_sp);
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}
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IOHandler::~IOHandler() = default;
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int IOHandler::GetInputFD() {
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return (m_input_sp ? m_input_sp->GetDescriptor() : -1);
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}
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int IOHandler::GetOutputFD() {
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return (m_output_sp ? m_output_sp->GetFile().GetDescriptor() : -1);
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}
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int IOHandler::GetErrorFD() {
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return (m_error_sp ? m_error_sp->GetFile().GetDescriptor() : -1);
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}
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FILE *IOHandler::GetInputFILE() {
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return (m_input_sp ? m_input_sp->GetStream() : nullptr);
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}
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FILE *IOHandler::GetOutputFILE() {
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return (m_output_sp ? m_output_sp->GetFile().GetStream() : nullptr);
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}
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FILE *IOHandler::GetErrorFILE() {
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return (m_error_sp ? m_error_sp->GetFile().GetStream() : nullptr);
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}
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FileSP IOHandler::GetInputFileSP() { return m_input_sp; }
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StreamFileSP IOHandler::GetOutputStreamFileSP() { return m_output_sp; }
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StreamFileSP IOHandler::GetErrorStreamFileSP() { return m_error_sp; }
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bool IOHandler::GetIsInteractive() {
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return GetInputFileSP() ? GetInputFileSP()->GetIsInteractive() : false;
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}
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bool IOHandler::GetIsRealTerminal() {
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return GetInputFileSP() ? GetInputFileSP()->GetIsRealTerminal() : false;
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}
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void IOHandler::SetPopped(bool b) { m_popped.SetValue(b, eBroadcastOnChange); }
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void IOHandler::WaitForPop() { m_popped.WaitForValueEqualTo(true); }
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void IOHandler::PrintAsync(const char *s, size_t len, bool is_stdout) {
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std::lock_guard<std::recursive_mutex> guard(m_output_mutex);
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lldb::StreamFileSP stream = is_stdout ? m_output_sp : m_error_sp;
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stream->Write(s, len);
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stream->Flush();
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}
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bool IOHandlerStack::PrintAsync(const char *s, size_t len, bool is_stdout) {
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std::lock_guard<std::recursive_mutex> guard(m_mutex);
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if (!m_top)
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return false;
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m_top->PrintAsync(s, len, is_stdout);
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return true;
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}
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IOHandlerConfirm::IOHandlerConfirm(Debugger &debugger, llvm::StringRef prompt,
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bool default_response)
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: IOHandlerEditline(
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debugger, IOHandler::Type::Confirm,
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nullptr, // nullptr editline_name means no history loaded/saved
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llvm::StringRef(), // No prompt
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llvm::StringRef(), // No continuation prompt
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false, // Multi-line
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false, // Don't colorize the prompt (i.e. the confirm message.)
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0, *this, nullptr),
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m_default_response(default_response), m_user_response(default_response) {
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StreamString prompt_stream;
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prompt_stream.PutCString(prompt);
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if (m_default_response)
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prompt_stream.Printf(": [Y/n] ");
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else
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prompt_stream.Printf(": [y/N] ");
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SetPrompt(prompt_stream.GetString());
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}
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IOHandlerConfirm::~IOHandlerConfirm() = default;
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void IOHandlerConfirm::IOHandlerComplete(IOHandler &io_handler,
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CompletionRequest &request) {
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if (request.GetRawCursorPos() != 0)
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return;
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request.AddCompletion(m_default_response ? "y" : "n");
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}
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void IOHandlerConfirm::IOHandlerInputComplete(IOHandler &io_handler,
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std::string &line) {
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if (line.empty()) {
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// User just hit enter, set the response to the default
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m_user_response = m_default_response;
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io_handler.SetIsDone(true);
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return;
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}
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if (line.size() == 1) {
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switch (line[0]) {
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case 'y':
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case 'Y':
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m_user_response = true;
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io_handler.SetIsDone(true);
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return;
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case 'n':
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case 'N':
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m_user_response = false;
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io_handler.SetIsDone(true);
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return;
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default:
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break;
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}
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}
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if (line == "yes" || line == "YES" || line == "Yes") {
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m_user_response = true;
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io_handler.SetIsDone(true);
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} else if (line == "no" || line == "NO" || line == "No") {
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m_user_response = false;
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io_handler.SetIsDone(true);
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}
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}
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llvm::Optional<std::string>
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IOHandlerDelegate::IOHandlerSuggestion(IOHandler &io_handler,
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llvm::StringRef line) {
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return io_handler.GetDebugger()
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.GetCommandInterpreter()
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.GetAutoSuggestionForCommand(line);
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}
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void IOHandlerDelegate::IOHandlerComplete(IOHandler &io_handler,
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CompletionRequest &request) {
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switch (m_completion) {
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case Completion::None:
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break;
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case Completion::LLDBCommand:
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io_handler.GetDebugger().GetCommandInterpreter().HandleCompletion(request);
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break;
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case Completion::Expression:
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CommandCompletions::InvokeCommonCompletionCallbacks(
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io_handler.GetDebugger().GetCommandInterpreter(),
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CommandCompletions::eVariablePathCompletion, request, nullptr);
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break;
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}
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}
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IOHandlerEditline::IOHandlerEditline(
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Debugger &debugger, IOHandler::Type type,
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const char *editline_name, // Used for saving history files
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llvm::StringRef prompt, llvm::StringRef continuation_prompt,
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bool multi_line, bool color_prompts, uint32_t line_number_start,
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IOHandlerDelegate &delegate, repro::DataRecorder *data_recorder)
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: IOHandlerEditline(debugger, type,
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FileSP(), // Inherit input from top input reader
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StreamFileSP(), // Inherit output from top input reader
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StreamFileSP(), // Inherit error from top input reader
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0, // Flags
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editline_name, // Used for saving history files
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prompt, continuation_prompt, multi_line, color_prompts,
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line_number_start, delegate, data_recorder) {}
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IOHandlerEditline::IOHandlerEditline(
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Debugger &debugger, IOHandler::Type type, const lldb::FileSP &input_sp,
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const lldb::StreamFileSP &output_sp, const lldb::StreamFileSP &error_sp,
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uint32_t flags,
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const char *editline_name, // Used for saving history files
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llvm::StringRef prompt, llvm::StringRef continuation_prompt,
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bool multi_line, bool color_prompts, uint32_t line_number_start,
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IOHandlerDelegate &delegate, repro::DataRecorder *data_recorder)
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: IOHandler(debugger, type, input_sp, output_sp, error_sp, flags,
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data_recorder),
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#if LLDB_ENABLE_LIBEDIT
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m_editline_up(),
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#endif
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m_delegate(delegate), m_prompt(), m_continuation_prompt(),
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m_current_lines_ptr(nullptr), m_base_line_number(line_number_start),
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m_curr_line_idx(UINT32_MAX), m_multi_line(multi_line),
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m_color_prompts(color_prompts), m_interrupt_exits(true) {
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SetPrompt(prompt);
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#if LLDB_ENABLE_LIBEDIT
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bool use_editline = false;
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use_editline = GetInputFILE() && GetOutputFILE() && GetErrorFILE() &&
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m_input_sp && m_input_sp->GetIsRealTerminal();
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if (use_editline) {
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m_editline_up = std::make_unique<Editline>(
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editline_name, GetInputFILE(), GetOutputFILE(), GetErrorFILE(),
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GetOutputMutex(), m_color_prompts);
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m_editline_up->SetIsInputCompleteCallback(
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[this](Editline *editline, StringList &lines) {
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return this->IsInputCompleteCallback(editline, lines);
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});
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m_editline_up->SetAutoCompleteCallback([this](CompletionRequest &request) {
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this->AutoCompleteCallback(request);
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});
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if (debugger.GetUseAutosuggestion()) {
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m_editline_up->SetSuggestionCallback([this](llvm::StringRef line) {
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return this->SuggestionCallback(line);
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});
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m_editline_up->SetSuggestionAnsiPrefix(ansi::FormatAnsiTerminalCodes(
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debugger.GetAutosuggestionAnsiPrefix()));
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m_editline_up->SetSuggestionAnsiSuffix(ansi::FormatAnsiTerminalCodes(
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debugger.GetAutosuggestionAnsiSuffix()));
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}
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// See if the delegate supports fixing indentation
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const char *indent_chars = delegate.IOHandlerGetFixIndentationCharacters();
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if (indent_chars) {
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// The delegate does support indentation, hook it up so when any
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// indentation character is typed, the delegate gets a chance to fix it
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FixIndentationCallbackType f = [this](Editline *editline,
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const StringList &lines,
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int cursor_position) {
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return this->FixIndentationCallback(editline, lines, cursor_position);
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};
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m_editline_up->SetFixIndentationCallback(std::move(f), indent_chars);
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}
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}
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#endif
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SetBaseLineNumber(m_base_line_number);
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SetPrompt(prompt);
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SetContinuationPrompt(continuation_prompt);
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}
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IOHandlerEditline::~IOHandlerEditline() {
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#if LLDB_ENABLE_LIBEDIT
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m_editline_up.reset();
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#endif
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}
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void IOHandlerEditline::Activate() {
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IOHandler::Activate();
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m_delegate.IOHandlerActivated(*this, GetIsInteractive());
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}
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void IOHandlerEditline::Deactivate() {
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IOHandler::Deactivate();
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m_delegate.IOHandlerDeactivated(*this);
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}
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void IOHandlerEditline::TerminalSizeChanged() {
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#if LLDB_ENABLE_LIBEDIT
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if (m_editline_up)
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m_editline_up->TerminalSizeChanged();
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#endif
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}
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// Split out a line from the buffer, if there is a full one to get.
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static Optional<std::string> SplitLine(std::string &line_buffer) {
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size_t pos = line_buffer.find('\n');
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if (pos == std::string::npos)
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return None;
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std::string line =
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std::string(StringRef(line_buffer.c_str(), pos).rtrim("\n\r"));
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line_buffer = line_buffer.substr(pos + 1);
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return line;
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}
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// If the final line of the file ends without a end-of-line, return
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// it as a line anyway.
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static Optional<std::string> SplitLineEOF(std::string &line_buffer) {
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if (llvm::all_of(line_buffer, llvm::isSpace))
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return None;
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std::string line = std::move(line_buffer);
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line_buffer.clear();
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return line;
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}
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bool IOHandlerEditline::GetLine(std::string &line, bool &interrupted) {
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#if LLDB_ENABLE_LIBEDIT
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if (m_editline_up) {
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bool b = m_editline_up->GetLine(line, interrupted);
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if (b && m_data_recorder)
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m_data_recorder->Record(line, true);
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return b;
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}
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#endif
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line.clear();
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if (GetIsInteractive()) {
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const char *prompt = nullptr;
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if (m_multi_line && m_curr_line_idx > 0)
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prompt = GetContinuationPrompt();
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if (prompt == nullptr)
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prompt = GetPrompt();
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if (prompt && prompt[0]) {
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if (m_output_sp) {
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m_output_sp->Printf("%s", prompt);
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m_output_sp->Flush();
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}
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}
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}
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Optional<std::string> got_line = SplitLine(m_line_buffer);
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if (!got_line && !m_input_sp) {
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// No more input file, we are done...
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SetIsDone(true);
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return false;
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}
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FILE *in = GetInputFILE();
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char buffer[256];
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if (!got_line && !in && m_input_sp) {
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// there is no FILE*, fall back on just reading bytes from the stream.
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while (!got_line) {
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size_t bytes_read = sizeof(buffer);
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Status error = m_input_sp->Read((void *)buffer, bytes_read);
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if (error.Success() && !bytes_read) {
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got_line = SplitLineEOF(m_line_buffer);
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break;
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}
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if (error.Fail())
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break;
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m_line_buffer += StringRef(buffer, bytes_read);
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got_line = SplitLine(m_line_buffer);
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}
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}
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if (!got_line && in) {
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while (!got_line) {
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char *r = fgets(buffer, sizeof(buffer), in);
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#ifdef _WIN32
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// ReadFile on Windows is supposed to set ERROR_OPERATION_ABORTED
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// according to the docs on MSDN. However, this has evidently been a
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// known bug since Windows 8. Therefore, we can't detect if a signal
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// interrupted in the fgets. So pressing ctrl-c causes the repl to end
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// and the process to exit. A temporary workaround is just to attempt to
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// fgets twice until this bug is fixed.
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if (r == nullptr)
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r = fgets(buffer, sizeof(buffer), in);
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// this is the equivalent of EINTR for Windows
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if (r == nullptr && GetLastError() == ERROR_OPERATION_ABORTED)
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continue;
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#endif
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if (r == nullptr) {
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if (ferror(in) && errno == EINTR)
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continue;
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if (feof(in))
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got_line = SplitLineEOF(m_line_buffer);
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break;
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}
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m_line_buffer += buffer;
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got_line = SplitLine(m_line_buffer);
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}
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}
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if (got_line) {
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line = got_line.getValue();
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if (m_data_recorder)
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m_data_recorder->Record(line, true);
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}
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return (bool)got_line;
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}
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#if LLDB_ENABLE_LIBEDIT
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bool IOHandlerEditline::IsInputCompleteCallback(Editline *editline,
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StringList &lines) {
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return m_delegate.IOHandlerIsInputComplete(*this, lines);
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}
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int IOHandlerEditline::FixIndentationCallback(Editline *editline,
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const StringList &lines,
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int cursor_position) {
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return m_delegate.IOHandlerFixIndentation(*this, lines, cursor_position);
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}
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llvm::Optional<std::string>
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IOHandlerEditline::SuggestionCallback(llvm::StringRef line) {
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return m_delegate.IOHandlerSuggestion(*this, line);
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}
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void IOHandlerEditline::AutoCompleteCallback(CompletionRequest &request) {
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m_delegate.IOHandlerComplete(*this, request);
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}
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#endif
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const char *IOHandlerEditline::GetPrompt() {
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#if LLDB_ENABLE_LIBEDIT
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if (m_editline_up) {
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return m_editline_up->GetPrompt();
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} else {
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#endif
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if (m_prompt.empty())
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return nullptr;
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#if LLDB_ENABLE_LIBEDIT
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}
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#endif
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return m_prompt.c_str();
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}
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bool IOHandlerEditline::SetPrompt(llvm::StringRef prompt) {
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m_prompt = std::string(prompt);
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#if LLDB_ENABLE_LIBEDIT
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if (m_editline_up)
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m_editline_up->SetPrompt(m_prompt.empty() ? nullptr : m_prompt.c_str());
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#endif
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return true;
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}
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const char *IOHandlerEditline::GetContinuationPrompt() {
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return (m_continuation_prompt.empty() ? nullptr
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: m_continuation_prompt.c_str());
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}
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void IOHandlerEditline::SetContinuationPrompt(llvm::StringRef prompt) {
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m_continuation_prompt = std::string(prompt);
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#if LLDB_ENABLE_LIBEDIT
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if (m_editline_up)
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m_editline_up->SetContinuationPrompt(m_continuation_prompt.empty()
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? nullptr
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: m_continuation_prompt.c_str());
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#endif
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}
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void IOHandlerEditline::SetBaseLineNumber(uint32_t line) {
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m_base_line_number = line;
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}
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uint32_t IOHandlerEditline::GetCurrentLineIndex() const {
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#if LLDB_ENABLE_LIBEDIT
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if (m_editline_up)
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return m_editline_up->GetCurrentLine();
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#endif
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return m_curr_line_idx;
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}
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bool IOHandlerEditline::GetLines(StringList &lines, bool &interrupted) {
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m_current_lines_ptr = &lines;
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bool success = false;
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#if LLDB_ENABLE_LIBEDIT
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if (m_editline_up) {
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return m_editline_up->GetLines(m_base_line_number, lines, interrupted);
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} else {
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#endif
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bool done = false;
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Status error;
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|
|
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while (!done) {
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// Show line numbers if we are asked to
|
|
std::string line;
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|
if (m_base_line_number > 0 && GetIsInteractive()) {
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if (m_output_sp) {
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m_output_sp->Printf("%u%s",
|
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m_base_line_number + (uint32_t)lines.GetSize(),
|
|
GetPrompt() == nullptr ? " " : "");
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|
}
|
|
}
|
|
|
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m_curr_line_idx = lines.GetSize();
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|
|
|
bool interrupted = false;
|
|
if (GetLine(line, interrupted) && !interrupted) {
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|
lines.AppendString(line);
|
|
done = m_delegate.IOHandlerIsInputComplete(*this, lines);
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|
} else {
|
|
done = true;
|
|
}
|
|
}
|
|
success = lines.GetSize() > 0;
|
|
#if LLDB_ENABLE_LIBEDIT
|
|
}
|
|
#endif
|
|
return success;
|
|
}
|
|
|
|
// Each IOHandler gets to run until it is done. It should read data from the
|
|
// "in" and place output into "out" and "err and return when done.
|
|
void IOHandlerEditline::Run() {
|
|
std::string line;
|
|
while (IsActive()) {
|
|
bool interrupted = false;
|
|
if (m_multi_line) {
|
|
StringList lines;
|
|
if (GetLines(lines, interrupted)) {
|
|
if (interrupted) {
|
|
m_done = m_interrupt_exits;
|
|
m_delegate.IOHandlerInputInterrupted(*this, line);
|
|
|
|
} else {
|
|
line = lines.CopyList();
|
|
m_delegate.IOHandlerInputComplete(*this, line);
|
|
}
|
|
} else {
|
|
m_done = true;
|
|
}
|
|
} else {
|
|
if (GetLine(line, interrupted)) {
|
|
if (interrupted)
|
|
m_delegate.IOHandlerInputInterrupted(*this, line);
|
|
else
|
|
m_delegate.IOHandlerInputComplete(*this, line);
|
|
} else {
|
|
m_done = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void IOHandlerEditline::Cancel() {
|
|
#if LLDB_ENABLE_LIBEDIT
|
|
if (m_editline_up)
|
|
m_editline_up->Cancel();
|
|
#endif
|
|
}
|
|
|
|
bool IOHandlerEditline::Interrupt() {
|
|
// Let the delgate handle it first
|
|
if (m_delegate.IOHandlerInterrupt(*this))
|
|
return true;
|
|
|
|
#if LLDB_ENABLE_LIBEDIT
|
|
if (m_editline_up)
|
|
return m_editline_up->Interrupt();
|
|
#endif
|
|
return false;
|
|
}
|
|
|
|
void IOHandlerEditline::GotEOF() {
|
|
#if LLDB_ENABLE_LIBEDIT
|
|
if (m_editline_up)
|
|
m_editline_up->Interrupt();
|
|
#endif
|
|
}
|
|
|
|
void IOHandlerEditline::PrintAsync(const char *s, size_t len, bool is_stdout) {
|
|
#if LLDB_ENABLE_LIBEDIT
|
|
if (m_editline_up) {
|
|
std::lock_guard<std::recursive_mutex> guard(m_output_mutex);
|
|
lldb::StreamFileSP stream = is_stdout ? m_output_sp : m_error_sp;
|
|
m_editline_up->PrintAsync(stream.get(), s, len);
|
|
} else
|
|
#endif
|
|
{
|
|
#ifdef _WIN32
|
|
const char *prompt = GetPrompt();
|
|
if (prompt) {
|
|
// Back up over previous prompt using Windows API
|
|
CONSOLE_SCREEN_BUFFER_INFO screen_buffer_info;
|
|
HANDLE console_handle = GetStdHandle(STD_OUTPUT_HANDLE);
|
|
GetConsoleScreenBufferInfo(console_handle, &screen_buffer_info);
|
|
COORD coord = screen_buffer_info.dwCursorPosition;
|
|
coord.X -= strlen(prompt);
|
|
if (coord.X < 0)
|
|
coord.X = 0;
|
|
SetConsoleCursorPosition(console_handle, coord);
|
|
}
|
|
#endif
|
|
IOHandler::PrintAsync(s, len, is_stdout);
|
|
#ifdef _WIN32
|
|
if (prompt)
|
|
IOHandler::PrintAsync(prompt, strlen(prompt), is_stdout);
|
|
#endif
|
|
}
|
|
}
|