e64cc75681
This is a follow-up to D116372, which had a rather unfortunate side effect of making the processing of a single SIGCHLD quadratic in the number of threads -- which does not matter for simple applications, but can get really bad for applications with thousands of threads. This patch fixes the problem by implementing the other possibility mentioned in the first patch -- doing waitpid(-1) centrally and then routing the events to the correct process instance. The "uncollected" threads are held in the process factory class -- which I've renamed to Manager for this purpose, as it now does more than creating processes. Differential Revision: https://reviews.llvm.org/D146977
137 lines
4.6 KiB
C++
137 lines
4.6 KiB
C++
//===-- NativeProcessFreeBSD.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 liblldb_NativeProcessFreeBSD_H_
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#define liblldb_NativeProcessFreeBSD_H_
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#include "Plugins/Process/POSIX/NativeProcessELF.h"
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#include "Plugins/Process/Utility/NativeProcessSoftwareSingleStep.h"
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#include "lldb/Target/MemoryRegionInfo.h"
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#include "lldb/Utility/ArchSpec.h"
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#include "lldb/Utility/FileSpec.h"
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#include "NativeThreadFreeBSD.h"
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namespace lldb_private {
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namespace process_freebsd {
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/// \class NativeProcessFreeBSD
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/// Manages communication with the inferior (debugee) process.
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///
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/// Upon construction, this class prepares and launches an inferior process
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/// for debugging.
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///
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/// Changes in the inferior process state are broadcasted.
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class NativeProcessFreeBSD : public NativeProcessELF,
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private NativeProcessSoftwareSingleStep {
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public:
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class Manager : public NativeProcessProtocol::Manager {
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public:
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using NativeProcessProtocol::Manager::Manager;
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llvm::Expected<std::unique_ptr<NativeProcessProtocol>>
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Launch(ProcessLaunchInfo &launch_info,
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NativeDelegate &native_delegate) override;
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llvm::Expected<std::unique_ptr<NativeProcessProtocol>>
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Attach(lldb::pid_t pid, NativeDelegate &native_delegate) override;
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Extension GetSupportedExtensions() const override;
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};
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// NativeProcessProtocol Interface
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Status Resume(const ResumeActionList &resume_actions) override;
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Status Halt() override;
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Status Detach() override;
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Status Signal(int signo) override;
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Status Interrupt() override;
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Status Kill() override;
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Status GetMemoryRegionInfo(lldb::addr_t load_addr,
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MemoryRegionInfo &range_info) override;
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Status ReadMemory(lldb::addr_t addr, void *buf, size_t size,
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size_t &bytes_read) override;
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Status WriteMemory(lldb::addr_t addr, const void *buf, size_t size,
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size_t &bytes_written) override;
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size_t UpdateThreads() override;
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const ArchSpec &GetArchitecture() const override { return m_arch; }
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Status SetBreakpoint(lldb::addr_t addr, uint32_t size,
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bool hardware) override;
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// The two following methods are probably not necessary and probably
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// will never be called. Nevertheless, we implement them right now
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// to reduce the differences between different platforms and reduce
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// the risk of the lack of implementation actually breaking something,
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// at least for the time being.
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Status GetLoadedModuleFileSpec(const char *module_path,
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FileSpec &file_spec) override;
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Status GetFileLoadAddress(const llvm::StringRef &file_name,
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lldb::addr_t &load_addr) override;
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llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
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GetAuxvData() const override;
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// Interface used by NativeRegisterContext-derived classes.
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static Status PtraceWrapper(int req, lldb::pid_t pid, void *addr = nullptr,
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int data = 0, int *result = nullptr);
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bool SupportHardwareSingleStepping() const;
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llvm::Expected<std::string> SaveCore(llvm::StringRef path_hint) override;
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protected:
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llvm::Expected<llvm::ArrayRef<uint8_t>>
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GetSoftwareBreakpointTrapOpcode(size_t size_hint) override;
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private:
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MainLoop::SignalHandleUP m_sigchld_handle;
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ArchSpec m_arch;
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MainLoop& m_main_loop;
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LazyBool m_supports_mem_region = eLazyBoolCalculate;
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std::vector<std::pair<MemoryRegionInfo, FileSpec>> m_mem_region_cache;
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// Private Instance Methods
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NativeProcessFreeBSD(::pid_t pid, int terminal_fd, NativeDelegate &delegate,
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const ArchSpec &arch, MainLoop &mainloop);
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bool HasThreadNoLock(lldb::tid_t thread_id);
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NativeThreadFreeBSD &AddThread(lldb::tid_t thread_id);
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void RemoveThread(lldb::tid_t thread_id);
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void MonitorCallback(lldb::pid_t pid, int signal);
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void MonitorExited(lldb::pid_t pid, WaitStatus status);
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void MonitorSIGSTOP(lldb::pid_t pid);
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void MonitorSIGTRAP(lldb::pid_t pid);
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void MonitorSignal(lldb::pid_t pid, int signal);
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void MonitorClone(::pid_t child_pid, bool is_vfork,
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NativeThreadFreeBSD &parent_thread);
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Status PopulateMemoryRegionCache();
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void SigchldHandler();
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Status Attach();
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Status SetupTrace();
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Status ReinitializeThreads();
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};
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} // namespace process_freebsd
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} // namespace lldb_private
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#endif // #ifndef liblldb_NativeProcessFreeBSD_H_
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