45f5cb31dc
Summary: This change removes the thread state coordinator thread by making all the operations it was performing synchronous. In order to prevent deadlock, NativeProcessLinux must now always call m_monitor->DoOperation with the m_threads_mutex released. This is needed because HandleWait callbacks lock the mutex (which means the monitor thread will block waiting on whoever holds the lock). If the other thread now requests a monitor operation, it will wait for the monitor thread do process it, creating a deadlock. To preserve this invariant I have introduced two new Monitor commands: "begin operation block" and "end operation block". They begin command blocks the monitor from processing waitpid events until the corresponding end command, thereby assuring the monitor does not attempt to acquire the mutex. Test Plan: Run the test suite locally, verify no tests fail. Reviewers: vharron, chaoren Subscribers: lldb-commits Differential Revision: http://reviews.llvm.org/D9227 llvm-svn: 236501
383 lines
12 KiB
C++
383 lines
12 KiB
C++
//===-- NativeProcessLinux.h ---------------------------------- -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef liblldb_NativeProcessLinux_H_
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#define liblldb_NativeProcessLinux_H_
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// C Includes
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#include <semaphore.h>
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#include <signal.h>
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// C++ Includes
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#include <unordered_set>
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// Other libraries and framework includes
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#include "lldb/Core/ArchSpec.h"
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#include "lldb/lldb-types.h"
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#include "lldb/Host/Debug.h"
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#include "lldb/Host/HostThread.h"
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#include "lldb/Host/Mutex.h"
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#include "lldb/Target/MemoryRegionInfo.h"
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#include "lldb/Host/common/NativeProcessProtocol.h"
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namespace lldb_private {
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class Error;
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class Module;
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class Scalar;
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namespace process_linux {
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class ThreadStateCoordinator;
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/// @class NativeProcessLinux
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/// @brief 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 for
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/// debugging.
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///
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/// Changes in the inferior process state are broadcasted.
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class NativeProcessLinux: public NativeProcessProtocol
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{
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public:
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static Error
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LaunchProcess (
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Module *exe_module,
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ProcessLaunchInfo &launch_info,
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NativeProcessProtocol::NativeDelegate &native_delegate,
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NativeProcessProtocolSP &native_process_sp);
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static Error
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AttachToProcess (
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lldb::pid_t pid,
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NativeProcessProtocol::NativeDelegate &native_delegate,
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NativeProcessProtocolSP &native_process_sp);
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// ---------------------------------------------------------------------
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// NativeProcessProtocol Interface
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// ---------------------------------------------------------------------
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Error
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Resume (const ResumeActionList &resume_actions) override;
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Error
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Halt () override;
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Error
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Detach () override;
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Error
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Signal (int signo) override;
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Error
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Interrupt () override;
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Error
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Kill () override;
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Error
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GetMemoryRegionInfo (lldb::addr_t load_addr, MemoryRegionInfo &range_info) override;
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Error
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ReadMemory(lldb::addr_t addr, void *buf, size_t size, size_t &bytes_read) override;
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Error
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ReadMemoryWithoutTrap(lldb::addr_t addr, void *buf, size_t size, size_t &bytes_read) override;
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Error
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WriteMemory(lldb::addr_t addr, const void *buf, size_t size, size_t &bytes_written) override;
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Error
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AllocateMemory(size_t size, uint32_t permissions, lldb::addr_t &addr) override;
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Error
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DeallocateMemory (lldb::addr_t addr) override;
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lldb::addr_t
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GetSharedLibraryInfoAddress () override;
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size_t
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UpdateThreads () override;
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bool
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GetArchitecture (ArchSpec &arch) const override;
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Error
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SetBreakpoint (lldb::addr_t addr, uint32_t size, bool hardware) override;
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Error
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SetWatchpoint (lldb::addr_t addr, size_t size, uint32_t watch_flags, bool hardware) override;
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Error
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RemoveWatchpoint (lldb::addr_t addr) override;
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void
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DoStopIDBumped (uint32_t newBumpId) override;
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void
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Terminate () override;
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// ---------------------------------------------------------------------
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// Interface used by NativeRegisterContext-derived classes.
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// ---------------------------------------------------------------------
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/// Reads the contents from the register identified by the given (architecture
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/// dependent) offset.
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///
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/// This method is provided for use by RegisterContextLinux derivatives.
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Error
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ReadRegisterValue(lldb::tid_t tid, unsigned offset, const char *reg_name,
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unsigned size, RegisterValue &value);
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/// Writes the given value to the register identified by the given
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/// (architecture dependent) offset.
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///
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/// This method is provided for use by RegisterContextLinux derivatives.
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Error
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WriteRegisterValue(lldb::tid_t tid, unsigned offset, const char *reg_name,
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const RegisterValue &value);
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/// Reads all general purpose registers into the specified buffer.
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Error
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ReadGPR(lldb::tid_t tid, void *buf, size_t buf_size);
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/// Reads generic floating point registers into the specified buffer.
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Error
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ReadFPR(lldb::tid_t tid, void *buf, size_t buf_size);
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/// Reads the specified register set into the specified buffer.
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/// For instance, the extended floating-point register set.
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Error
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ReadRegisterSet(lldb::tid_t tid, void *buf, size_t buf_size, unsigned int regset);
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/// Writes all general purpose registers into the specified buffer.
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Error
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WriteGPR(lldb::tid_t tid, void *buf, size_t buf_size);
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/// Writes generic floating point registers into the specified buffer.
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Error
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WriteFPR(lldb::tid_t tid, void *buf, size_t buf_size);
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/// Writes the specified register set into the specified buffer.
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/// For instance, the extended floating-point register set.
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Error
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WriteRegisterSet(lldb::tid_t tid, void *buf, size_t buf_size, unsigned int regset);
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Error
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GetLoadedModuleFileSpec(const char* module_path, FileSpec& file_spec) override;
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protected:
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// ---------------------------------------------------------------------
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// NativeProcessProtocol protected interface
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// ---------------------------------------------------------------------
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Error
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GetSoftwareBreakpointTrapOpcode (size_t trap_opcode_size_hint, size_t &actual_opcode_size, const uint8_t *&trap_opcode_bytes) override;
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private:
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class Monitor;
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ArchSpec m_arch;
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std::unique_ptr<Monitor> m_monitor_up;
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LazyBool m_supports_mem_region;
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std::vector<MemoryRegionInfo> m_mem_region_cache;
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Mutex m_mem_region_cache_mutex;
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std::unique_ptr<ThreadStateCoordinator> m_coordinator_up;
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// List of thread ids stepping with a breakpoint with the address of
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// the relevan breakpoint
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std::map<lldb::tid_t, lldb::addr_t> m_threads_stepping_with_breakpoint;
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/// @class LauchArgs
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///
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/// @brief Simple structure to pass data to the thread responsible for
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/// launching a child process.
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struct LaunchArgs
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{
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LaunchArgs(Module *module,
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char const **argv,
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char const **envp,
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const std::string &stdin_path,
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const std::string &stdout_path,
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const std::string &stderr_path,
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const char *working_dir,
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const ProcessLaunchInfo &launch_info);
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~LaunchArgs();
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Module *m_module; // The executable image to launch.
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char const **m_argv; // Process arguments.
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char const **m_envp; // Process environment.
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const std::string &m_stdin_path; // Redirect stdin if not empty.
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const std::string &m_stdout_path; // Redirect stdout if not empty.
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const std::string &m_stderr_path; // Redirect stderr if not empty.
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const char *m_working_dir; // Working directory or NULL.
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const ProcessLaunchInfo &m_launch_info;
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};
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typedef std::function<::pid_t(Error &)> InitialOperation;
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// ---------------------------------------------------------------------
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// Private Instance Methods
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// ---------------------------------------------------------------------
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NativeProcessLinux ();
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/// Launches an inferior process ready for debugging. Forms the
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/// implementation of Process::DoLaunch.
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void
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LaunchInferior (
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Module *module,
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char const *argv[],
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char const *envp[],
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const std::string &stdin_path,
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const std::string &stdout_path,
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const std::string &stderr_path,
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const char *working_dir,
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const ProcessLaunchInfo &launch_info,
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Error &error);
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/// Attaches to an existing process. Forms the
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/// implementation of Process::DoAttach
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void
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AttachToInferior (lldb::pid_t pid, Error &error);
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void
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StartMonitorThread(const InitialOperation &operation, Error &error);
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::pid_t
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Launch(LaunchArgs *args, Error &error);
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::pid_t
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Attach(lldb::pid_t pid, Error &error);
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static Error
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SetDefaultPtraceOpts(const lldb::pid_t);
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static bool
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DupDescriptor(const char *path, int fd, int flags);
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static void *
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MonitorThread(void *baton);
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void
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MonitorCallback(lldb::pid_t pid, bool exited, int signal, int status);
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void
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WaitForNewThread(::pid_t tid);
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void
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MonitorSIGTRAP(const siginfo_t *info, lldb::pid_t pid);
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void
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MonitorTrace(lldb::pid_t pid, NativeThreadProtocolSP thread_sp);
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void
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MonitorBreakpoint(lldb::pid_t pid, NativeThreadProtocolSP thread_sp);
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void
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MonitorWatchpoint(lldb::pid_t pid, NativeThreadProtocolSP thread_sp, uint32_t wp_index);
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void
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MonitorSignal(const siginfo_t *info, lldb::pid_t pid, bool exited);
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bool
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SupportHardwareSingleStepping() const;
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Error
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SetupSoftwareSingleStepping(NativeThreadProtocolSP thread_sp);
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#if 0
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static ::ProcessMessage::CrashReason
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GetCrashReasonForSIGSEGV(const siginfo_t *info);
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static ::ProcessMessage::CrashReason
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GetCrashReasonForSIGILL(const siginfo_t *info);
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static ::ProcessMessage::CrashReason
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GetCrashReasonForSIGFPE(const siginfo_t *info);
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static ::ProcessMessage::CrashReason
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GetCrashReasonForSIGBUS(const siginfo_t *info);
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#endif
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bool
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HasThreadNoLock (lldb::tid_t thread_id);
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NativeThreadProtocolSP
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MaybeGetThreadNoLock (lldb::tid_t thread_id);
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bool
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StopTrackingThread (lldb::tid_t thread_id);
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NativeThreadProtocolSP
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AddThread (lldb::tid_t thread_id);
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Error
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GetSoftwareBreakpointPCOffset (NativeRegisterContextSP context_sp, uint32_t &actual_opcode_size);
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Error
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FixupBreakpointPCAsNeeded (NativeThreadProtocolSP &thread_sp);
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/// Writes a siginfo_t structure corresponding to the given thread ID to the
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/// memory region pointed to by @p siginfo.
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Error
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GetSignalInfo(lldb::tid_t tid, void *siginfo);
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/// Writes the raw event message code (vis-a-vis PTRACE_GETEVENTMSG)
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/// corresponding to the given thread ID to the memory pointed to by @p
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/// message.
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Error
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GetEventMessage(lldb::tid_t tid, unsigned long *message);
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/// Resumes the given thread. If @p signo is anything but
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/// LLDB_INVALID_SIGNAL_NUMBER, deliver that signal to the thread.
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Error
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Resume(lldb::tid_t tid, uint32_t signo);
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/// Single steps the given thread. If @p signo is anything but
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/// LLDB_INVALID_SIGNAL_NUMBER, deliver that signal to the thread.
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Error
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SingleStep(lldb::tid_t tid, uint32_t signo);
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// ThreadStateCoordinator helper methods.
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void
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NotifyThreadCreateStopped (lldb::tid_t tid);
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void
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NotifyThreadCreateRunning (lldb::tid_t tid);
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void
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NotifyThreadDeath (lldb::tid_t tid);
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void
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NotifyThreadStop (lldb::tid_t tid);
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void
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CallAfterRunningThreadsStop (lldb::tid_t tid,
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const std::function<void (lldb::tid_t tid)> &call_after_function);
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void
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CallAfterRunningThreadsStopWithSkipTID (lldb::tid_t deferred_signal_tid,
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lldb::tid_t skip_stop_request_tid,
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const std::function<void (lldb::tid_t tid)> &call_after_function);
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Error
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Detach(lldb::tid_t tid);
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Error
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RequestThreadStop (const lldb::pid_t pid, const lldb::tid_t tid);
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};
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} // namespace process_linux
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} // namespace lldb_private
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#endif // #ifndef liblldb_NativeProcessLinux_H_
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