1 /* Copyright (c) 2007-2014. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
10 #include <sys/types.h> // off_t
11 #include <stdint.h> // size_t
13 #include <simgrid_config.h>
14 #include "../xbt/mmalloc/mmprivate.h"
15 #include <xbt/asserts.h>
16 #include <xbt/dynar.h>
18 #include "mc_forward.h"
19 #include "ModelChecker.hpp"
20 #include "PageStore.hpp"
21 #include "mc_mmalloc.h"
22 #include "mc/AddressSpace.hpp"
27 // ***** Snapshot region
29 typedef enum e_mc_region_type_t {
30 MC_REGION_TYPE_UNKNOWN = 0,
31 MC_REGION_TYPE_HEAP = 1,
32 MC_REGION_TYPE_DATA = 2
35 // TODO, use OO instead of this
36 typedef enum e_mc_region_storeage_type_t {
37 MC_REGION_STORAGE_TYPE_NONE = 0,
38 MC_REGION_STORAGE_TYPE_FLAT = 1,
39 MC_REGION_STORAGE_TYPE_CHUNKED = 2,
40 MC_REGION_STORAGE_TYPE_PRIVATIZED = 3
41 } mc_region_storage_type_t;
48 std::vector<std::size_t> pagenos_;
50 PerPageCopy() : store_(nullptr) {}
51 PerPageCopy(PerPageCopy const& that)
54 pagenos_ = that.pagenos_;
55 for (std::size_t pageno : pagenos_)
56 store_->ref_page(pageno);
60 for (std::size_t pageno : pagenos_)
61 store_->unref_page(pageno);
68 PerPageCopy(PerPageCopy&& that)
71 that.store_ = nullptr;
72 pagenos_ = std::move(that.pagenos_);
73 that.pagenos_.clear();
75 PerPageCopy& operator=(PerPageCopy const& that)
79 pagenos_ = that.pagenos_;
80 for (std::size_t pageno : pagenos_)
81 store_->ref_page(pageno);
84 PerPageCopy& operator=(PerPageCopy && that)
88 that.store_ = nullptr;
89 pagenos_ = std::move(that.pagenos_);
90 that.pagenos_.clear();
94 std::size_t page_count() const
96 return pagenos_.size();
99 std::size_t pageno(std::size_t i) const
104 const void* page(std::size_t i) const
106 return store_->get_page(pagenos_[i]);
109 PerPageCopy(PageStore& store, AddressSpace& as,
110 remote_ptr<void> addr, std::size_t page_count);
113 /** @brief Copy/snapshot of a given memory region
115 * Different types of region snapshot storage types exist:
117 * <li>flat/dense snapshots are a simple copy of the region;</li>
118 * <li>sparse/per-page snapshots are snaapshots which shared
119 * identical pages.</li>
120 * <li>privatized (SMPI global variable privatisation).
123 * This is handled with a variant based approch:
125 * * `storage_type` identified the type of storage;
126 * * an anonymous enum is used to distinguish the relevant types for
129 class RegionSnapshot {
131 mc_region_type_t region_type;
132 mc_region_storage_type_t storage_type;
133 mc_object_info_t object_info;
135 /** @brief Virtual address of the region in the simulated process */
138 /** @brief Size of the data region in bytes */
141 /** @brief Permanent virtual address of the region
143 * This is usually the same address as the simuilated process address.
144 * However, when using SMPI privatization of global variables,
145 * each SMPI process has its own set of global variables stored
146 * at a different virtual address. The scheduler maps those region
147 * on the region of the global variables.
150 void *permanent_addr;
152 std::vector<char> flat_data_;
153 PerPageCopy page_numbers_;
154 std::vector<std::unique_ptr<RegionSnapshot>> privatized_regions_;
157 region_type(MC_REGION_TYPE_UNKNOWN),
158 storage_type(MC_REGION_STORAGE_TYPE_NONE),
159 object_info(nullptr),
162 permanent_addr(nullptr)
165 RegionSnapshot(RegionSnapshot const&) = delete;
166 RegionSnapshot& operator=(RegionSnapshot const&) = delete;
172 typedef class simgrid::mc::RegionSnapshot s_mc_mem_region_t, *mc_mem_region_t;
174 MC_SHOULD_BE_INTERNAL mc_mem_region_t mc_region_new_sparse(
175 mc_region_type_t type, void *start_addr, void* data_addr, size_t size);
176 XBT_INTERNAL void mc_region_restore_sparse(mc_process_t process, mc_mem_region_t reg);
178 static inline __attribute__ ((always_inline))
179 bool mc_region_contain(mc_mem_region_t region, const void* p)
181 return p >= region->start_addr &&
182 p < (void*)((char*) region->start_addr + region->size);
185 static inline __attribute__((always_inline))
186 void* mc_translate_address_region_chunked(uintptr_t addr, mc_mem_region_t region)
188 size_t pageno = mc_page_number(region->start_addr, (void*) addr);
189 const void* snapshot_page =
190 region->page_numbers_.page(pageno);
191 return (char*) snapshot_page + mc_page_offset((void*) addr);
194 static inline __attribute__((always_inline))
195 void* mc_translate_address_region(uintptr_t addr, mc_mem_region_t region, int process_index)
197 switch (region->storage_type) {
198 case MC_REGION_STORAGE_TYPE_NONE:
200 xbt_die("Storage type not supported");
202 case MC_REGION_STORAGE_TYPE_FLAT:
204 uintptr_t offset = addr - (uintptr_t) region->start_addr;
205 return (void *) ((uintptr_t) region->flat_data_.data() + offset);
208 case MC_REGION_STORAGE_TYPE_CHUNKED:
209 return mc_translate_address_region_chunked(addr, region);
211 case MC_REGION_STORAGE_TYPE_PRIVATIZED:
213 xbt_assert(process_index >=0,
214 "Missing process index for privatized region");
215 xbt_assert((size_t) process_index < region->privatized_regions_.size(),
216 "Out of range process index");
217 mc_mem_region_t subregion = region->privatized_regions_[process_index].get();
218 xbt_assert(subregion, "Missing memory region for process %i", process_index);
219 return mc_translate_address_region(addr, subregion, process_index);
224 XBT_INTERNAL mc_mem_region_t mc_get_snapshot_region(
225 const void* addr, const s_mc_snapshot_t *snapshot, int process_index);
231 * Some parts of the snapshot are ignored by zeroing them out: the real
232 * values is stored here.
234 typedef struct s_mc_snapshot_ignored_data {
238 } s_mc_snapshot_ignored_data_t, *mc_snapshot_ignored_data_t;
240 typedef struct s_fd_infos{
243 off_t current_position;
245 }s_fd_infos_t, *fd_infos_t;
252 class Snapshot : public AddressSpace {
256 const void* read_bytes(void* buffer, std::size_t size,
257 remote_ptr<void> address, int process_index = ProcessIndexAny,
258 ReadMode mode = Normal) const MC_OVERRIDE;
259 public: // To be private
260 mc_process_t process;
262 size_t heap_bytes_used;
263 mc_mem_region_t* snapshot_regions;
264 size_t snapshot_regions_count;
265 xbt_dynar_t enabled_processes;
266 int privatization_index;
269 xbt_dynar_t to_ignore;
271 xbt_dynar_t ignored_data;
273 fd_infos_t *current_fd;
281 static inline __attribute__ ((always_inline))
282 mc_mem_region_t mc_get_region_hinted(void* addr, mc_snapshot_t snapshot, int process_index, mc_mem_region_t region)
284 if (mc_region_contain(region, addr))
287 return mc_get_snapshot_region(addr, snapshot, process_index);
290 /** Information about a given stack frame
293 typedef struct s_mc_stack_frame {
294 /** Instruction pointer */
298 unw_word_t frame_base;
301 unw_cursor_t unw_cursor;
302 } s_mc_stack_frame_t, *mc_stack_frame_t;
304 typedef struct s_mc_snapshot_stack{
305 xbt_dynar_t local_variables;
306 mc_unw_context_t context;
307 xbt_dynar_t stack_frames; // mc_stack_frame_t
309 }s_mc_snapshot_stack_t, *mc_snapshot_stack_t;
311 typedef struct s_mc_global_t {
312 mc_snapshot_t snapshot;
315 int initial_communications_pattern_done;
316 int recv_deterministic;
317 int send_deterministic;
320 }s_mc_global_t, *mc_global_t;
322 static const void* mc_snapshot_get_heap_end(mc_snapshot_t snapshot);
324 XBT_INTERNAL mc_snapshot_t MC_take_snapshot(int num_state);
325 XBT_INTERNAL void MC_restore_snapshot(mc_snapshot_t);
327 XBT_INTERNAL void mc_restore_page_snapshot_region(
328 mc_process_t process,
329 void* start_addr, simgrid::mc::PerPageCopy const& pagenos);
331 MC_SHOULD_BE_INTERNAL const void* MC_region_read_fragmented(
332 mc_mem_region_t region, void* target, const void* addr, size_t size);
334 // Deprecated compatibility wrapper
336 const void* MC_snapshot_read(mc_snapshot_t snapshot,
337 simgrid::mc::AddressSpace::ReadMode mode,
338 void* target, const void* addr, size_t size, int process_index)
340 return snapshot->read_bytes(target, size, simgrid::mc::remote(addr),
341 process_index, mode);
344 MC_SHOULD_BE_INTERNAL int MC_snapshot_region_memcmp(
345 const void* addr1, mc_mem_region_t region1,
346 const void* addr2, mc_mem_region_t region2, size_t size);
347 XBT_INTERNAL int MC_snapshot_memcmp(
348 const void* addr1, mc_snapshot_t snapshot1,
349 const void* addr2, mc_snapshot_t snapshot2, int process_index, size_t size);
351 static inline __attribute__ ((always_inline))
352 const void* mc_snapshot_get_heap_end(mc_snapshot_t snapshot)
355 xbt_die("snapshot is NULL");
356 return mc_model_checker->process().get_heap()->breakval;
359 /** @brief Read memory from a snapshot region
361 * @param addr Process (non-snapshot) address of the data
362 * @param region Snapshot memory region where the data is located
363 * @param target Buffer to store the value
364 * @param size Size of the data to read in bytes
365 * @return Pointer where the data is located (target buffer of original location)
367 static inline __attribute__((always_inline))
368 const void* MC_region_read(mc_mem_region_t region, void* target, const void* addr, size_t size)
372 uintptr_t offset = (char*) addr - (char*) region->start_addr;
374 xbt_assert(mc_region_contain(region, addr),
375 "Trying to read out of the region boundary.");
377 switch (region->storage_type) {
378 case MC_REGION_STORAGE_TYPE_NONE:
380 xbt_die("Storage type not supported");
382 case MC_REGION_STORAGE_TYPE_FLAT:
383 return (char*) region->flat_data_.data() + offset;
385 case MC_REGION_STORAGE_TYPE_CHUNKED:
387 // Last byte of the region:
388 void* end = (char*) addr + size - 1;
389 if (mc_same_page(addr, end) ) {
390 // The memory is contained in a single page:
391 return mc_translate_address_region_chunked((uintptr_t) addr, region);
393 // The memory spans several pages:
394 return MC_region_read_fragmented(region, target, addr, size);
398 // We currently do not pass the process_index to this function so we assume
399 // that the privatized region has been resolved in the callers:
400 case MC_REGION_STORAGE_TYPE_PRIVATIZED:
401 xbt_die("Storage type not supported");
405 static inline __attribute__ ((always_inline))
406 void* MC_region_read_pointer(mc_mem_region_t region, const void* addr)
409 return *(void**) MC_region_read(region, &res, addr, sizeof(void*));