fb19f11ef4
Depends on D90490. The stop command is simple and invokes the new method Trace::StopTracingThread(thread). On the other hand, the start command works by delegating its implementation to a CommandObject provided by the Trace plugin. This is necessary because each trace plugin needs different options for this command. There's even the chance that a Trace plugin can't support live tracing, but instead supports offline decoding and analysis, which means that "thread trace dump instructions" works but "thread trace start" doest. Because of this and a few other reasons, it's better to have each plugin provide this implementation. Besides, I'm using the GetSupportedTraceType method introduced in D90490 to quickly infer what's the trace plug-in that works for the current process. As an implementation note, I moved CommandObjectIterateOverThreads to its header so that I can use it from the IntelPT plugin. Besides, the actual start and stop logic for intel-pt is not part of this diff. Reviewed By: clayborg Differential Revision: https://reviews.llvm.org/D90729
82 lines
2.8 KiB
C++
82 lines
2.8 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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} // namespace lldb_private
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#endif // LLDB_SOURCE_COMMANDS_COMMANDOBJECTTHREADUTIL_H
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