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0b69756110
This implements the interactive trace start and stop methods. This diff ended up being much larger than I anticipated because, by doing it, I found that I had implemented in the beginning many things in a non optimal way. In any case, the code is much better now. There's a lot of boilerplate code due to the gdb-remote protocol, but the main changes are: - New tracing packets: jLLDBTraceStop, jLLDBTraceStart, jLLDBTraceGetBinaryData. The gdb-remote packet definitions are quite comprehensive. - Implementation of the "process trace start|stop" and "thread trace start|stop" commands. - Implementaiton of an API in Trace.h to interact with live traces. - Created an IntelPTDecoder for live threads, that use the debugger's stop id as checkpoint for its internal cache. - Added a functionality to stop the process in case "process tracing" is enabled and a new thread can't traced. - Added tests I have some ideas to unify the code paths for post mortem and live threads, but I'll do that in another diff. Differential Revision: https://reviews.llvm.org/D91679
102 lines
3.6 KiB
C++
102 lines
3.6 KiB
C++
//===-- CommandObjectThreadUtil.h -------------------------------*- C++ -*-===//
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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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#ifndef LLDB_SOURCE_COMMANDS_COMMANDOBJECTTHREADUTIL_H
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#define LLDB_SOURCE_COMMANDS_COMMANDOBJECTTHREADUTIL_H
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#include "lldb/Interpreter/CommandObjectMultiword.h"
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namespace lldb_private {
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class CommandObjectIterateOverThreads : public CommandObjectParsed {
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class UniqueStack {
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public:
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UniqueStack(std::stack<lldb::addr_t> stack_frames, uint32_t thread_index_id)
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: m_stack_frames(stack_frames) {
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m_thread_index_ids.push_back(thread_index_id);
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}
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void AddThread(uint32_t thread_index_id) const {
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m_thread_index_ids.push_back(thread_index_id);
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}
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const std::vector<uint32_t> &GetUniqueThreadIndexIDs() const {
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return m_thread_index_ids;
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}
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lldb::tid_t GetRepresentativeThread() const {
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return m_thread_index_ids.front();
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}
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friend bool inline operator<(const UniqueStack &lhs,
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const UniqueStack &rhs) {
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return lhs.m_stack_frames < rhs.m_stack_frames;
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}
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protected:
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// Mark the thread index as mutable, as we don't care about it from a const
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// perspective, we only care about m_stack_frames so we keep our std::set
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// sorted.
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mutable std::vector<uint32_t> m_thread_index_ids;
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std::stack<lldb::addr_t> m_stack_frames;
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};
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public:
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CommandObjectIterateOverThreads(CommandInterpreter &interpreter,
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const char *name, const char *help,
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const char *syntax, uint32_t flags);
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~CommandObjectIterateOverThreads() override = default;
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bool DoExecute(Args &command, CommandReturnObject &result) override;
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protected:
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// Override this to do whatever you need to do for one thread.
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//
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// If you return false, the iteration will stop, otherwise it will proceed.
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// The result is set to m_success_return (defaults to
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// eReturnStatusSuccessFinishResult) before the iteration, so you only need
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// to set the return status in HandleOneThread if you want to indicate an
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// error. If m_add_return is true, a blank line will be inserted between each
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// of the listings (except the last one.)
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virtual bool HandleOneThread(lldb::tid_t, CommandReturnObject &result) = 0;
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bool BucketThread(lldb::tid_t tid, std::set<UniqueStack> &unique_stacks,
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CommandReturnObject &result);
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lldb::ReturnStatus m_success_return = lldb::eReturnStatusSuccessFinishResult;
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bool m_unique_stacks = false;
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bool m_add_return = true;
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};
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/// Class similar to \a CommandObjectIterateOverThreads, but which performs
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/// an action on multiple threads at once instead of iterating over each thread.
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class CommandObjectMultipleThreads : public CommandObjectParsed {
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public:
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using CommandObjectParsed::CommandObjectParsed;
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bool DoExecute(Args &command, CommandReturnObject &result) override;
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protected:
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/// Method that handles the command after the main arguments have been parsed.
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///
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/// \param[in] tids
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/// The thread ids passed as arguments.
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///
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/// \return
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/// A boolean result similar to the one expected from \a DoExecute.
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virtual bool DoExecuteOnThreads(Args &command, CommandReturnObject &result,
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const std::vector<lldb::tid_t> &tids) = 0;
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};
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} // namespace lldb_private
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#endif // LLDB_SOURCE_COMMANDS_COMMANDOBJECTTHREADUTIL_H
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