83a131b276
When launching an inferior in a new terminal window via AppleScript and the darwin-debug helper program, we could often end up with the inferior process having a too-high suspend count, and it would never resume execution. lldb tries to wait until darwin-debug has finished its work and has launched the inferior (WaitForProcessToSIGSTOP) but this wasn't working correctly - and cannot be made to work. This patch removes WaitForProcessToSIGSTOP, adds a special tiny segment to the darwin-debug executable so it can be identified as that binary (ExecExtraSuspend), and adds code to debugserver to detect this segment. When debugserver sees this segment, it notes that the next exec will be done with a launch-suspended flag. When the next exec happens, debugserver forces an extra task_resume when we resume the inferior. An alternative approach would be if lldb could detect when the inferior has been launched by darwin-debug unambiguously; monitoring when the unix socket between darwin-debug and lldb was closed would have been a reasonable way to do this too. <rdar://problem/29760580> Differential Revision: https://reviews.llvm.org/D72963
117 lines
4.0 KiB
C++
117 lines
4.0 KiB
C++
//===-- MachTask.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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//
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// MachTask.h
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// debugserver
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//
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// Created by Greg Clayton on 12/5/08.
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//
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//===----------------------------------------------------------------------===//
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#ifndef __MachTask_h__
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#define __MachTask_h__
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#include <mach/mach.h>
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#include <sys/socket.h>
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#include <map>
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#include <string>
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#include "DNBDefs.h"
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#include "MachException.h"
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#include "MachVMMemory.h"
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#include "PThreadMutex.h"
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class MachProcess;
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typedef uint64_t MachMallocEventId;
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enum MachMallocEventType {
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eMachMallocEventTypeAlloc = 2,
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eMachMallocEventTypeDealloc = 4,
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eMachMallocEventTypeOther = 1
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};
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struct MachMallocEvent {
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mach_vm_address_t m_base_address;
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uint64_t m_size;
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MachMallocEventType m_event_type;
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MachMallocEventId m_event_id;
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};
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class MachTask {
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public:
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// Constructors and Destructors
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MachTask(MachProcess *process);
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virtual ~MachTask();
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void Clear();
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kern_return_t Suspend();
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kern_return_t Resume();
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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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int GetMemoryRegionInfo(nub_addr_t addr, DNBRegionInfo *region_info);
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std::string GetProfileData(DNBProfileDataScanType scanType);
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nub_addr_t AllocateMemory(nub_size_t size, uint32_t permissions);
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nub_bool_t DeallocateMemory(nub_addr_t addr);
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mach_port_t ExceptionPort() const;
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bool ExceptionPortIsValid() const;
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kern_return_t SaveExceptionPortInfo();
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kern_return_t RestoreExceptionPortInfo();
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kern_return_t ShutDownExcecptionThread();
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bool StartExceptionThread(DNBError &err);
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nub_addr_t GetDYLDAllImageInfosAddress(DNBError &err);
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kern_return_t BasicInfo(struct task_basic_info *info);
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static kern_return_t BasicInfo(task_t task, struct task_basic_info *info);
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bool IsValid() const;
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static bool IsValid(task_t task);
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static void *ExceptionThread(void *arg);
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void TaskPortChanged(task_t task);
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task_t TaskPort() const { return m_task; }
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task_t TaskPortForProcessID(DNBError &err, bool force = false);
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static task_t TaskPortForProcessID(pid_t pid, DNBError &err,
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uint32_t num_retries = 10,
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uint32_t usec_interval = 10000);
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MachProcess *Process() { return m_process; }
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const MachProcess *Process() const { return m_process; }
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nub_size_t PageSize();
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void TaskWillExecProcessesSuspended() { m_exec_will_be_suspended = true; }
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protected:
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MachProcess *m_process; // The mach process that owns this MachTask
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task_t m_task;
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MachVMMemory m_vm_memory; // Special mach memory reading class that will take
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// care of watching for page and region boundaries
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MachException::PortInfo
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m_exc_port_info; // Saved settings for all exception ports
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pthread_t m_exception_thread; // Thread ID for the exception thread in case we
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// need it
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mach_port_t m_exception_port; // Exception port on which we will receive child
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// exceptions
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bool m_exec_will_be_suspended; // If this task exec's another process, that
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// process will be launched suspended and we will
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// need to execute one extra Resume to get it
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// to progress from dyld_start.
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bool m_do_double_resume; // next time we task_resume(), do it twice to
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// fix a too-high suspend count.
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typedef std::map<mach_vm_address_t, size_t> allocation_collection;
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allocation_collection m_allocations;
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private:
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MachTask(const MachTask &) = delete;
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MachTask &operator=(const MachTask &rhs) = delete;
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};
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#endif // __MachTask_h__
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