1 /* mc::RemoteClient: representative of the Client memory on the MC side */
3 /* Copyright (c) 2008-2023. The SimGrid Team. All rights reserved. */
5 /* This program is free software; you can redistribute it and/or modify it
6 * under the terms of the license (GNU LGPL) which comes with this package. */
8 #ifndef SIMGRID_MC_PROCESS_H
9 #define SIMGRID_MC_PROCESS_H
11 #include "src/mc/AddressSpace.hpp"
12 #include "src/mc/datatypes.h"
13 #include "src/mc/inspect/ObjectInformation.hpp"
14 #include "src/mc/remote/RemotePtr.hpp"
15 #include "src/xbt/memory_map.hpp"
16 #include "src/xbt/mmalloc/mmprivate.h"
18 #include <libunwind.h>
21 namespace simgrid::mc {
23 class ActorInformation {
25 /** MCed address of the process */
26 RemotePtr<kernel::actor::ActorImpl> address{nullptr};
27 Remote<kernel::actor::ActorImpl> copy;
29 /** Hostname (owned by `mc_model_checker->hostnames_`) */
30 const std::string* hostname = nullptr;
41 struct IgnoredRegion {
46 struct IgnoredHeapRegion {
53 /** The Application's process memory, seen from the Checker perspective
57 * - reading from the process memory (`AddressSpace`);
58 * - accessing the system state of the process (heap, …);
63 class RemoteProcessMemory final : public AddressSpace {
65 // Those flags are used to track down which cached information
66 // is still up to date and which information needs to be updated.
67 static constexpr int cache_none = 0;
68 static constexpr int cache_heap = 1;
69 static constexpr int cache_malloc = 2;
72 explicit RemoteProcessMemory(pid_t pid);
73 ~RemoteProcessMemory() override;
74 void init(xbt_mheap_t mmalloc_default_mdp);
76 RemoteProcessMemory(RemoteProcessMemory const&) = delete;
77 RemoteProcessMemory(RemoteProcessMemory&&) = delete;
78 RemoteProcessMemory& operator=(RemoteProcessMemory const&) = delete;
79 RemoteProcessMemory& operator=(RemoteProcessMemory&&) = delete;
86 void* read_bytes(void* buffer, std::size_t size, RemotePtr<void> address,
87 ReadOptions options = ReadOptions::none()) const override;
89 void read_variable(const char* name, void* target, size_t size) const;
90 template <class T> void read_variable(const char* name, T* target) const
92 read_variable(name, target, sizeof(*target));
94 template <class T> Remote<T> read_variable(const char* name) const
97 read_variable(name, res.get_buffer(), sizeof(T));
101 std::string read_string(RemotePtr<char> address) const;
102 using AddressSpace::read_string;
105 void write_bytes(const void* buffer, size_t len, RemotePtr<void> address) const;
106 void clear_bytes(RemotePtr<void> address, size_t len) const;
108 // Debug information:
109 std::shared_ptr<ObjectInformation> find_object_info(RemotePtr<void> addr) const;
110 std::shared_ptr<ObjectInformation> find_object_info_exec(RemotePtr<void> addr) const;
111 std::shared_ptr<ObjectInformation> find_object_info_rw(RemotePtr<void> addr) const;
112 Frame* find_function(RemotePtr<void> ip) const;
113 const Variable* find_variable(const char* name) const;
116 xbt_mheap_t get_heap()
118 if (not(this->cache_flags_ & RemoteProcessMemory::cache_heap))
119 this->refresh_heap();
120 return this->heap.get();
122 const malloc_info* get_malloc_info()
124 if (not(this->cache_flags_ & RemoteProcessMemory::cache_malloc))
125 this->refresh_malloc_info();
126 return this->heap_info.data();
128 /* Get the amount of memory mallocated in the remote process (requires mmalloc) */
129 std::size_t get_remote_heap_bytes();
131 void clear_cache() { this->cache_flags_ = RemoteProcessMemory::cache_none; }
133 std::vector<IgnoredRegion> const& ignored_regions() const { return ignored_regions_; }
134 void ignore_region(std::uint64_t address, std::size_t size);
136 pid_t pid() const { return pid_; }
138 bool in_maestro_stack(RemotePtr<void> p) const
140 return p >= this->maestro_stack_start_ && p < this->maestro_stack_end_;
143 bool running() const { return running_; }
145 void terminate() { running_ = false; }
147 void ignore_global_variable(const char* name) const
149 for (std::shared_ptr<ObjectInformation> const& info : this->object_infos)
150 info->remove_global_variable(name);
153 std::vector<s_stack_region_t>& stack_areas() { return stack_areas_; }
154 std::vector<s_stack_region_t> const& stack_areas() const { return stack_areas_; }
156 std::vector<IgnoredHeapRegion> const& ignored_heap() const { return ignored_heap_; }
157 void ignore_heap(IgnoredHeapRegion const& region);
158 void unignore_heap(void* address, size_t size);
160 void ignore_local_variable(const char* var_name, const char* frame_name) const;
162 void dump_stack() const;
165 void init_memory_map_info();
167 void refresh_malloc_info();
170 bool running_ = false;
171 std::vector<xbt::VmMap> memory_map_;
172 RemotePtr<void> maestro_stack_start_;
173 RemotePtr<void> maestro_stack_end_;
174 int memory_file = -1;
175 std::vector<IgnoredRegion> ignored_regions_;
176 std::vector<s_stack_region_t> stack_areas_;
177 std::vector<IgnoredHeapRegion> ignored_heap_;
179 /** State of the cache (which variables are up to date) */
180 int cache_flags_ = RemoteProcessMemory::cache_none;
184 // TODO, make private (first, objectify simgrid::mc::ObjectInformation*)
185 std::vector<std::shared_ptr<ObjectInformation>> object_infos;
186 std::shared_ptr<ObjectInformation> binary_info;
188 /** Address of the heap structure in the MCed process. */
189 RemotePtr<s_xbt_mheap_t> heap_address;
191 /** Copy of the heap structure of the process
193 * This is refreshed with the `MC_process_refresh` call.
194 * This is not used if the process is the current one:
195 * use `get_heap_info()` in order to use it.
197 std::unique_ptr<s_xbt_mheap_t> heap = std::make_unique<s_xbt_mheap_t>();
199 /** Copy of the allocation info structure
201 * This is refreshed with the `MC_process_refresh` call.
202 * This is not used if the process is the current one:
203 * use `get_malloc_info()` in order to use it.
205 std::vector<malloc_info> heap_info;
208 /** Full-featured MC-aware libunwind address space for the process
210 * This address space is using a simgrid::mc::UnwindContext*
211 * (with simgrid::mc::Process* / simgrid::mc::AddressSpace*
212 * and unw_context_t).
214 unw_addr_space_t unw_addr_space = nullptr;
216 /** Underlying libunwind address-space
218 * The `find_proc_info`, `put_unwind_info`, `get_dyn_info_list_addr`
219 * operations of the native MC address space is currently delegated
220 * to this address space (either the local or a ptrace unwinder).
222 unw_addr_space_t unw_underlying_addr_space = nullptr;
224 /** The corresponding context
226 void* unw_underlying_context = nullptr;
229 /** Open a FD to a remote process memory (`/dev/$pid/mem`) */
230 XBT_PRIVATE int open_vm(pid_t pid, int flags);
231 } // namespace simgrid::mc