d8cf1a119d
325,000 breakpoints for running "breakpoint set --func-regex ." on lldb itself (after hitting a breakpoint at main so that LLDB.framework is loaded) used to take up to an hour to set, now we are down under a minute. With warm file caches, we are at 40 seconds, and that is with setting 325,000 breakpoint through the GDB remote API. Linux and the native debuggers might be faster. I haven't timed what how much is debug info parsing and how much is the protocol traffic to/from GDB remote. That there were many performance issues. Most of them were due to storing breakpoints in the wrong data structures, or using the wrong iterators to traverse the lists, traversing the lists in inefficient ways, and not optimizing certain function name lookups/symbol merges correctly. Debugging after that is also now very efficient. There were issues with replacing the breakpoint opcodes in memory that was read, and those routines were also fixed. llvm-svn: 183820
312 lines
17 KiB
C++
312 lines
17 KiB
C++
//===-- MachProcess.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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//
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// Created by Greg Clayton on 6/15/07.
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//
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//===----------------------------------------------------------------------===//
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#ifndef __MachProcess_h__
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#define __MachProcess_h__
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#include "DNBDefs.h"
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#include "DNBBreakpoint.h"
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#include "DNBError.h"
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#include "DNBThreadResumeActions.h"
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#include "MachException.h"
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#include "MachVMMemory.h"
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#include "MachTask.h"
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#include "MachThreadList.h"
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#include "PThreadCondition.h"
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#include "PThreadEvent.h"
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#include "PThreadMutex.h"
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#include <mach/mach.h>
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#include <sys/signal.h>
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#include <pthread.h>
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#include <vector>
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class DNBThreadResumeActions;
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class MachProcess
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{
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public:
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//----------------------------------------------------------------------
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// Constructors and Destructors
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//----------------------------------------------------------------------
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MachProcess ();
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~MachProcess ();
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//----------------------------------------------------------------------
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// Child process control
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//----------------------------------------------------------------------
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pid_t AttachForDebug (pid_t pid, char *err_str, size_t err_len);
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pid_t LaunchForDebug (const char *path,
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char const *argv[],
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char const *envp[],
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const char *working_directory,
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const char *stdin_path,
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const char *stdout_path,
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const char *stderr_path,
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bool no_stdio,
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nub_launch_flavor_t launch_flavor,
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int disable_aslr,
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DNBError &err);
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static uint32_t GetCPUTypeForLocalProcess (pid_t pid);
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static pid_t ForkChildForPTraceDebugging (const char *path, char const *argv[], char const *envp[], MachProcess* process, DNBError &err);
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static pid_t PosixSpawnChildForPTraceDebugging (const char *path,
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cpu_type_t cpu_type,
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char const *argv[],
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char const *envp[],
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const char *working_directory,
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const char *stdin_path,
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const char *stdout_path,
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const char *stderr_path,
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bool no_stdio,
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MachProcess* process,
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int disable_aslr,
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DNBError& err);
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nub_addr_t GetDYLDAllImageInfosAddress ();
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static const void * PrepareForAttach (const char *path, nub_launch_flavor_t launch_flavor, bool waitfor, DNBError &err_str);
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static void CleanupAfterAttach (const void *attach_token, bool success, DNBError &err_str);
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static nub_process_t CheckForProcess (const void *attach_token);
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#ifdef WITH_SPRINGBOARD
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pid_t SBLaunchForDebug (const char *app_bundle_path, char const *argv[], char const *envp[], bool no_stdio, DNBError &launch_err);
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static pid_t SBForkChildForPTraceDebugging (const char *path, char const *argv[], char const *envp[], bool no_stdio, MachProcess* process, DNBError &launch_err);
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#endif
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nub_addr_t LookupSymbol (const char *name, const char *shlib);
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void SetNameToAddressCallback (DNBCallbackNameToAddress callback, void *baton)
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{
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m_name_to_addr_callback = callback;
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m_name_to_addr_baton = baton;
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}
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void SetSharedLibraryInfoCallback (DNBCallbackCopyExecutableImageInfos callback, void *baton)
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{
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m_image_infos_callback = callback;
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m_image_infos_baton = baton;
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}
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bool Resume (const DNBThreadResumeActions& thread_actions);
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bool Signal (int signal, const struct timespec *timeout_abstime = NULL);
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bool Kill (const struct timespec *timeout_abstime = NULL);
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bool Detach ();
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nub_size_t ReadMemory (nub_addr_t addr, nub_size_t size, void *buf);
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nub_size_t WriteMemory (nub_addr_t addr, nub_size_t size, const void *buf);
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//----------------------------------------------------------------------
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// Path and arg accessors
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//----------------------------------------------------------------------
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const char * Path () const { return m_path.c_str(); }
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size_t ArgumentCount () const { return m_args.size(); }
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const char * ArgumentAtIndex (size_t arg_idx) const
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{
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if (arg_idx < m_args.size())
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return m_args[arg_idx].c_str();
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return NULL;
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}
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//----------------------------------------------------------------------
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// Breakpoint functions
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//----------------------------------------------------------------------
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DNBBreakpoint * CreateBreakpoint (nub_addr_t addr, nub_size_t length, bool hardware);
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bool DisableBreakpoint (nub_addr_t addr, bool remove);
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void DisableAllBreakpoints (bool remove);
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bool EnableBreakpoint (nub_addr_t addr);
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DNBBreakpointList& Breakpoints() { return m_breakpoints; }
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const DNBBreakpointList& Breakpoints() const { return m_breakpoints; }
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//----------------------------------------------------------------------
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// Watchpoint functions
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//----------------------------------------------------------------------
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DNBBreakpoint * CreateWatchpoint (nub_addr_t addr, nub_size_t length, uint32_t watch_type, bool hardware);
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bool DisableWatchpoint (nub_addr_t addr, bool remove);
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void DisableAllWatchpoints (bool remove);
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bool EnableWatchpoint (nub_addr_t addr);
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uint32_t GetNumSupportedHardwareWatchpoints () const;
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DNBBreakpointList& Watchpoints() { return m_watchpoints; }
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const DNBBreakpointList& Watchpoints() const { return m_watchpoints; }
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//----------------------------------------------------------------------
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// Exception thread functions
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//----------------------------------------------------------------------
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bool StartSTDIOThread ();
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static void * STDIOThread (void *arg);
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void ExceptionMessageReceived (const MachException::Message& exceptionMessage);
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void ExceptionMessageBundleComplete ();
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void SharedLibrariesUpdated ();
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nub_size_t CopyImageInfos (struct DNBExecutableImageInfo **image_infos, bool only_changed);
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//----------------------------------------------------------------------
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// Profile functions
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//----------------------------------------------------------------------
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void SetEnableAsyncProfiling (bool enable, uint64_t internal_usec, DNBProfileDataScanType scan_type);
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bool IsProfilingEnabled () { return m_profile_enabled; }
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uint64_t ProfileInterval () { return m_profile_interval_usec; }
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bool StartProfileThread ();
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static void * ProfileThread (void *arg);
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void SignalAsyncProfileData (const char *info);
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size_t GetAsyncProfileData (char *buf, size_t buf_size);
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//----------------------------------------------------------------------
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// Accessors
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//----------------------------------------------------------------------
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pid_t ProcessID () const { return m_pid; }
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bool ProcessIDIsValid () const { return m_pid > 0; }
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pid_t SetProcessID (pid_t pid);
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MachTask& Task() { return m_task; }
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const MachTask& Task() const { return m_task; }
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PThreadEvent& Events() { return m_events; }
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const DNBRegisterSetInfo *
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GetRegisterSetInfo (nub_thread_t tid, nub_size_t *num_reg_sets) const;
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bool GetRegisterValue (nub_thread_t tid, uint32_t set, uint32_t reg, DNBRegisterValue *reg_value) const;
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bool SetRegisterValue (nub_thread_t tid, uint32_t set, uint32_t reg, const DNBRegisterValue *value) const;
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nub_bool_t SyncThreadState (nub_thread_t tid);
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const char * ThreadGetName (nub_thread_t tid);
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nub_state_t ThreadGetState (nub_thread_t tid);
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nub_size_t GetNumThreads () const;
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nub_thread_t GetThreadAtIndex (nub_size_t thread_idx) const;
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nub_thread_t GetCurrentThread ();
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nub_thread_t GetCurrentThreadMachPort ();
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nub_thread_t SetCurrentThread (nub_thread_t tid);
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MachThreadList & GetThreadList() { return m_thread_list; }
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bool GetThreadStoppedReason(nub_thread_t tid, struct DNBThreadStopInfo *stop_info);
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void DumpThreadStoppedReason(nub_thread_t tid) const;
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const char * GetThreadInfo (nub_thread_t tid) const;
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nub_thread_t GetThreadIDForMachPortNumber (thread_t mach_port_number) const;
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uint32_t GetCPUType ();
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nub_state_t GetState ();
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void SetState (nub_state_t state);
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bool IsRunning (nub_state_t state)
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{
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return state == eStateRunning || IsStepping(state);
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}
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bool IsStepping (nub_state_t state)
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{
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return state == eStateStepping;
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}
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bool CanResume (nub_state_t state)
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{
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return state == eStateStopped;
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}
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bool GetExitStatus(int* status)
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{
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if (GetState() == eStateExited)
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{
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if (status)
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*status = m_exit_status;
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return true;
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}
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return false;
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}
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void SetExitStatus(int status)
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{
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m_exit_status = status;
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SetState(eStateExited);
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}
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uint32_t StopCount() const { return m_stop_count; }
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void SetChildFileDescriptors (int stdin_fileno, int stdout_fileno, int stderr_fileno)
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{
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m_child_stdin = stdin_fileno;
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m_child_stdout = stdout_fileno;
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m_child_stderr = stderr_fileno;
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}
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int GetStdinFileDescriptor () const { return m_child_stdin; }
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int GetStdoutFileDescriptor () const { return m_child_stdout; }
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int GetStderrFileDescriptor () const { return m_child_stderr; }
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void AppendSTDOUT (char* s, size_t len);
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size_t GetAvailableSTDOUT (char *buf, size_t buf_size);
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size_t GetAvailableSTDERR (char *buf, size_t buf_size);
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void CloseChildFileDescriptors ()
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{
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if (m_child_stdin >= 0)
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{
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::close (m_child_stdin);
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m_child_stdin = -1;
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}
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if (m_child_stdout >= 0)
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{
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::close (m_child_stdout);
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m_child_stdout = -1;
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}
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if (m_child_stderr >= 0)
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{
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::close (m_child_stderr);
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m_child_stderr = -1;
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}
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}
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bool ProcessUsingSpringBoard() const { return (m_flags & eMachProcessFlagsUsingSBS) != 0; }
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DNBProfileDataScanType GetProfileScanType () { return m_profile_scan_type; }
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private:
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enum
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{
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eMachProcessFlagsNone = 0,
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eMachProcessFlagsAttached = (1 << 0),
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eMachProcessFlagsUsingSBS = (1 << 1)
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};
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void Clear ();
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void ReplyToAllExceptions ();
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void PrivateResume ();
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uint32_t Flags () const { return m_flags; }
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nub_state_t DoSIGSTOP (bool clear_bps_and_wps, bool allow_running, uint32_t *thread_idx_ptr);
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pid_t m_pid; // Process ID of child process
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cpu_type_t m_cpu_type; // The CPU type of this process
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int m_child_stdin;
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int m_child_stdout;
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int m_child_stderr;
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std::string m_path; // A path to the executable if we have one
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std::vector<std::string> m_args; // The arguments with which the process was lauched
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int m_exit_status; // The exit status for the process
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MachTask m_task; // The mach task for this process
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uint32_t m_flags; // Process specific flags (see eMachProcessFlags enums)
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uint32_t m_stop_count; // A count of many times have we stopped
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pthread_t m_stdio_thread; // Thread ID for the thread that watches for child process stdio
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PThreadMutex m_stdio_mutex; // Multithreaded protection for stdio
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std::string m_stdout_data;
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bool m_profile_enabled; // A flag to indicate if profiling is enabled
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uint64_t m_profile_interval_usec; // If enable, the profiling interval in microseconds
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DNBProfileDataScanType m_profile_scan_type; // Indicates what needs to be profiled
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pthread_t m_profile_thread; // Thread ID for the thread that profiles the inferior
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PThreadMutex m_profile_data_mutex; // Multithreaded protection for profile info data
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std::vector<std::string> m_profile_data; // Profile data, must be protected by m_profile_data_mutex
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DNBThreadResumeActions m_thread_actions; // The thread actions for the current MachProcess::Resume() call
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MachException::Message::collection
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m_exception_messages; // A collection of exception messages caught when listening to the exception port
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PThreadMutex m_exception_messages_mutex; // Multithreaded protection for m_exception_messages
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MachThreadList m_thread_list; // A list of threads that is maintained/updated after each stop
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nub_state_t m_state; // The state of our process
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PThreadMutex m_state_mutex; // Multithreaded protection for m_state
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PThreadEvent m_events; // Process related events in the child processes lifetime can be waited upon
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PThreadEvent m_private_events; // Used to coordinate running and stopping the process without affecting m_events
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DNBBreakpointList m_breakpoints; // Breakpoint list for this process
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DNBBreakpointList m_watchpoints; // Watchpoint list for this process
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DNBCallbackNameToAddress m_name_to_addr_callback;
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void * m_name_to_addr_baton;
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DNBCallbackCopyExecutableImageInfos
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m_image_infos_callback;
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void * m_image_infos_baton;
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bool m_did_exec;
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};
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#endif // __MachProcess_h__
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