-/* Copyright (c) 2008-2018. The SimGrid Team. All rights reserved. */
-
-/* This program is free software; you can redistribute it and/or modify it
- * under the terms of the license (GNU LGPL) which comes with this package. */
-
-/** \file compare.cpp Memory snapshooting and comparison */
-
-#include <cinttypes>
-
-#include <array>
-#include <memory>
-#include <set>
-#include <utility>
-#include <unordered_set>
-
-#include "xbt/dynar.h"
-#include "xbt/sysdep.h"
-#include <xbt/mmalloc.h>
-
-#include <mc/mc.h>
-#include <mc/datatypes.h>
-
-#include "src/internal_config.h"
-
-#include "src/xbt/mmalloc/mmprivate.h"
-
-#if HAVE_SMPI
-#include "src/smpi/include/private.hpp"
-#endif
-
-#include "src/mc/Frame.hpp"
-#include "src/mc/ObjectInformation.hpp"
-#include "src/mc/Type.hpp"
-#include "src/mc/Variable.hpp"
-#include "src/mc/mc_config.hpp"
-#include "src/mc/mc_dwarf.hpp"
-#include "src/mc/mc_forward.hpp"
-#include "src/mc/mc_private.hpp"
-#include "src/mc/mc_smx.hpp"
-#include "src/mc/mc_snapshot.hpp"
-
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_compare, xbt, "Logging specific to mc_compare in mc");
-
-namespace simgrid {
-namespace mc {
-
-struct HeapLocation;
-typedef std::array<HeapLocation, 2> HeapLocationPair;
-typedef std::set<HeapLocationPair> HeapLocationPairs;
-struct HeapArea;
-struct ProcessComparisonState;
-struct StateComparator;
-
-static int compare_heap_area(
- StateComparator& state,
- int process_index, const void *area1, const void* area2,
- Snapshot* snapshot1, Snapshot* snapshot2,
- HeapLocationPairs* previous, Type* type, int pointer_level);
-
-}
-}
-
-using simgrid::mc::remote;
-
-/*********************************** Heap comparison ***********************************/
-/***************************************************************************************/
-
-namespace simgrid {
-namespace mc {
-
-class HeapLocation {
-public:
- int block_ = 0;
- int fragment_ = 0;
-
- HeapLocation() = default;
- HeapLocation(int block, int fragment = 0) : block_(block), fragment_(fragment) {}
-
- bool operator==(HeapLocation const& that) const
- {
- return block_ == that.block_ && fragment_ == that.fragment_;
- }
- bool operator<(HeapLocation const& that) const
- {
- return std::make_pair(block_, fragment_) < std::make_pair(that.block_, that.fragment_);
- }
-};
-
-static inline
-HeapLocationPair makeHeapLocationPair(int block1, int fragment1, int block2, int fragment2)
-{
- return simgrid::mc::HeapLocationPair{{
- simgrid::mc::HeapLocation(block1, fragment1),
- simgrid::mc::HeapLocation(block2, fragment2)
- }};
-}
-
-class HeapArea : public HeapLocation {
-public:
- bool valid_ = false;
- HeapArea() = default;
- explicit HeapArea(int block) : valid_(true) { block_ = block; }
- HeapArea(int block, int fragment) : valid_(true)
- {
- block_ = block;
- fragment_ = fragment;
- }
-};
-
-class ProcessComparisonState {
-public:
- std::vector<simgrid::mc::IgnoredHeapRegion>* to_ignore = nullptr;
- std::vector<HeapArea> equals_to;
- std::vector<simgrid::mc::Type*> types;
- std::size_t heapsize = 0;
-
- void initHeapInformation(xbt_mheap_t heap, std::vector<simgrid::mc::IgnoredHeapRegion>* i);
-};
-
-namespace {
-
-/** A hash which works with more stuff
- *
- * It can hash pairs: the standard hash currently doesn't include this.
- */
-template <class X> class hash : public std::hash<X> {
-};
-
-template <class X, class Y> class hash<std::pair<X, Y>> {
-public:
- std::size_t operator()(std::pair<X,Y>const& x) const
- {
- hash<X> h1;
- hash<X> h2;
- return h1(x.first) ^ h2(x.second);
- }
-};
-
-}
-
-class StateComparator {
-public:
- s_xbt_mheap_t std_heap_copy;
- std::size_t heaplimit;
- std::array<ProcessComparisonState, 2> processStates;
-
- std::unordered_set<std::pair<void*, void*>, hash<std::pair<void*, void*>>> compared_pointers;
-
- void clear()
- {
- compared_pointers.clear();
- }
-
- int initHeapInformation(
- xbt_mheap_t heap1, xbt_mheap_t heap2,
- std::vector<simgrid::mc::IgnoredHeapRegion>* i1,
- std::vector<simgrid::mc::IgnoredHeapRegion>* i2);
-
- HeapArea& equals_to1_(std::size_t i, std::size_t j)
- {
- return processStates[0].equals_to[ MAX_FRAGMENT_PER_BLOCK * i + j];
- }
- HeapArea& equals_to2_(std::size_t i, std::size_t j)
- {
- return processStates[1].equals_to[ MAX_FRAGMENT_PER_BLOCK * i + j];
- }
- Type*& types1_(std::size_t i, std::size_t j)
- {
- return processStates[0].types[ MAX_FRAGMENT_PER_BLOCK * i + j];
- }
- Type*& types2_(std::size_t i, std::size_t j)
- {
- return processStates[1].types[ MAX_FRAGMENT_PER_BLOCK * i + j];
- }
-
- HeapArea const& equals_to1_(std::size_t i, std::size_t j) const
- {
- return processStates[0].equals_to[ MAX_FRAGMENT_PER_BLOCK * i + j];
- }
- HeapArea const& equals_to2_(std::size_t i, std::size_t j) const
- {
- return processStates[1].equals_to[ MAX_FRAGMENT_PER_BLOCK * i + j];
- }
- Type* const& types1_(std::size_t i, std::size_t j) const
- {
- return processStates[0].types[ MAX_FRAGMENT_PER_BLOCK * i + j];
- }
- Type* const& types2_(std::size_t i, std::size_t j) const
- {
- return processStates[1].types[ MAX_FRAGMENT_PER_BLOCK * i + j];
- }
-
- /** Check whether two blocks are known to be matching
- *
- * @param b1 Block of state 1
- * @param b2 Block of state 2
- * @return if the blocks are known to be matching
- */
- bool blocksEqual(int b1, int b2) const
- {
- return this->equals_to1_(b1, 0).block_ == b2 && this->equals_to2_(b2, 0).block_ == b1;
- }
-
- /** Check whether two fragments are known to be matching
- *
- * @param b1 Block of state 1
- * @param f1 Fragment of state 1
- * @param b2 Block of state 2
- * @param f2 Fragment of state 2
- * @return if the fragments are known to be matching
- */
- int fragmentsEqual(int b1, int f1, int b2, int f2) const
- {
- return this->equals_to1_(b1, f1).block_ == b2 && this->equals_to1_(b1, f1).fragment_ == f2 &&
- this->equals_to2_(b2, f2).block_ == b1 && this->equals_to2_(b2, f2).fragment_ == f1;
- }
-
- void match_equals(HeapLocationPairs* list);
-};
-
-}
-}
-
-/************************************************************************************/
-
-static ssize_t heap_comparison_ignore_size(
- std::vector<simgrid::mc::IgnoredHeapRegion>* ignore_list,
- const void *address)
-{
- int start = 0;
- int end = ignore_list->size() - 1;
-
- while (start <= end) {
- unsigned int cursor = (start + end) / 2;
- simgrid::mc::IgnoredHeapRegion const& region = (*ignore_list)[cursor];
- if (region.address == address)
- return region.size;
- if (region.address < address)
- start = cursor + 1;
- if (region.address > address)
- end = cursor - 1;
- }
-
- return -1;
-}
-
-static bool is_stack(const void *address)
-{
- for (auto const& stack : mc_model_checker->process().stack_areas())
- if (address == stack.address)
- return true;
- return false;
-}
-
-// TODO, this should depend on the snapshot?
-static bool is_block_stack(int block)
-{
- for (auto const& stack : mc_model_checker->process().stack_areas())
- if (block == stack.block)
- return true;
- return false;
-}
-
-namespace simgrid {
-namespace mc {
-
-void StateComparator::match_equals(HeapLocationPairs* list)
-{
- for (auto const& pair : *list) {
- if (pair[0].fragment_ != -1) {
- this->equals_to1_(pair[0].block_, pair[0].fragment_) = simgrid::mc::HeapArea(pair[1].block_, pair[1].fragment_);
- this->equals_to2_(pair[1].block_, pair[1].fragment_) = simgrid::mc::HeapArea(pair[0].block_, pair[0].fragment_);
- } else {
- this->equals_to1_(pair[0].block_, 0) = simgrid::mc::HeapArea(pair[1].block_, pair[1].fragment_);
- this->equals_to2_(pair[1].block_, 0) = simgrid::mc::HeapArea(pair[0].block_, pair[0].fragment_);
- }
- }
-}
-
-void ProcessComparisonState::initHeapInformation(xbt_mheap_t heap,
- std::vector<simgrid::mc::IgnoredHeapRegion>* i)
-{
- auto heaplimit = heap->heaplimit;
- this->heapsize = heap->heapsize;
- this->to_ignore = i;
- this->equals_to.assign(heaplimit * MAX_FRAGMENT_PER_BLOCK, HeapArea());
- this->types.assign(heaplimit * MAX_FRAGMENT_PER_BLOCK, nullptr);
-}
-
-int StateComparator::initHeapInformation(xbt_mheap_t heap1, xbt_mheap_t heap2,
- std::vector<simgrid::mc::IgnoredHeapRegion>* i1,
- std::vector<simgrid::mc::IgnoredHeapRegion>* i2)
-{
- if ((heap1->heaplimit != heap2->heaplimit) || (heap1->heapsize != heap2->heapsize))
- return -1;
- this->heaplimit = heap1->heaplimit;
- this->std_heap_copy = *mc_model_checker->process().get_heap();
- this->processStates[0].initHeapInformation(heap1, i1);
- this->processStates[1].initHeapInformation(heap2, i2);
- return 0;
-}
-
-// TODO, have a robust way to find it in O(1)
-static inline
-mc_mem_region_t MC_get_heap_region(simgrid::mc::Snapshot* snapshot)
-{
- for (auto const& region : snapshot->snapshot_regions)
- if (region->region_type() == simgrid::mc::RegionType::Heap)
- return region.get();
- xbt_die("No heap region");
-}
-
-static
-int mmalloc_compare_heap(
- simgrid::mc::StateComparator& state, simgrid::mc::Snapshot* snapshot1, simgrid::mc::Snapshot* snapshot2)
-{
- simgrid::mc::RemoteClient* process = &mc_model_checker->process();
-
- /* Start comparison */
- size_t i1;
- size_t i2;
- size_t j1;
- size_t j2;
- size_t k;
- void* addr_block1;
- void* addr_block2;
- void* addr_frag1;
- void* addr_frag2;
- int nb_diff1 = 0;
- int nb_diff2 = 0;
- int equal;
-
- /* Check busy blocks */
- i1 = 1;
-
- malloc_info heapinfo_temp1;
- malloc_info heapinfo_temp2;
- malloc_info heapinfo_temp2b;
-
- mc_mem_region_t heap_region1 = MC_get_heap_region(snapshot1);
- mc_mem_region_t heap_region2 = MC_get_heap_region(snapshot2);
-
- // This is the address of std_heap->heapinfo in the application process:
- void* heapinfo_address = &((xbt_mheap_t) process->heap_address)->heapinfo;
-
- // This is in snapshot do not use them directly:
- const malloc_info* heapinfos1 = snapshot1->read<malloc_info*>(
- RemotePtr<malloc_info*>((std::uint64_t)heapinfo_address), simgrid::mc::ProcessIndexMissing);
- const malloc_info* heapinfos2 = snapshot2->read<malloc_info*>(
- RemotePtr<malloc_info*>((std::uint64_t)heapinfo_address), simgrid::mc::ProcessIndexMissing);
-
- while (i1 < state.heaplimit) {
-
- const malloc_info* heapinfo1 = (const malloc_info*) MC_region_read(heap_region1, &heapinfo_temp1, &heapinfos1[i1], sizeof(malloc_info));
- const malloc_info* heapinfo2 = (const malloc_info*) MC_region_read(heap_region2, &heapinfo_temp2, &heapinfos2[i1], sizeof(malloc_info));
-
- if (heapinfo1->type == MMALLOC_TYPE_FREE || heapinfo1->type == MMALLOC_TYPE_HEAPINFO) { /* Free block */
- i1 ++;
- continue;
- }
-
- if (heapinfo1->type < 0) {
- fprintf(stderr, "Unkown mmalloc block type.\n");
- abort();
- }
-
- addr_block1 = ((void*)(((ADDR2UINT(i1)) - 1) * BLOCKSIZE + (char*)state.std_heap_copy.heapbase));
-
- if (heapinfo1->type == MMALLOC_TYPE_UNFRAGMENTED) { /* Large block */
-
- if (is_stack(addr_block1)) {
- for (k = 0; k < heapinfo1->busy_block.size; k++)
- state.equals_to1_(i1 + k, 0) = HeapArea(i1, -1);
- for (k = 0; k < heapinfo2->busy_block.size; k++)
- state.equals_to2_(i1 + k, 0) = HeapArea(i1, -1);
- i1 += heapinfo1->busy_block.size;
- continue;
- }
-
- if (state.equals_to1_(i1, 0).valid_) {
- i1++;
- continue;
- }
-
- i2 = 1;
- equal = 0;
-
- /* Try first to associate to same block in the other heap */
- if (heapinfo2->type == heapinfo1->type && state.equals_to2_(i1, 0).valid_ == 0) {
- addr_block2 = (ADDR2UINT(i1) - 1) * BLOCKSIZE + (char*)state.std_heap_copy.heapbase;
- int res_compare = compare_heap_area(state, simgrid::mc::ProcessIndexMissing, addr_block1, addr_block2,
- snapshot1, snapshot2, nullptr, nullptr, 0);
- if (res_compare != 1) {
- for (k = 1; k < heapinfo2->busy_block.size; k++)
- state.equals_to2_(i1 + k, 0) = HeapArea(i1, -1);
- for (k = 1; k < heapinfo1->busy_block.size; k++)
- state.equals_to1_(i1 + k, 0) = HeapArea(i1, -1);
- equal = 1;
- i1 += heapinfo1->busy_block.size;
- }
- }
-
- while (i2 < state.heaplimit && not equal) {
-
- addr_block2 = (ADDR2UINT(i2) - 1) * BLOCKSIZE + (char*)state.std_heap_copy.heapbase;
-
- if (i2 == i1) {
- i2++;
- continue;
- }
-
- const malloc_info* heapinfo2b = (const malloc_info*) MC_region_read(heap_region2, &heapinfo_temp2b, &heapinfos2[i2], sizeof(malloc_info));
-
- if (heapinfo2b->type != MMALLOC_TYPE_UNFRAGMENTED) {
- i2++;
- continue;
- }
-
- if (state.equals_to2_(i2, 0).valid_) {
- i2++;
- continue;
- }
-
- int res_compare = compare_heap_area(state, simgrid::mc::ProcessIndexMissing, addr_block1, addr_block2,
- snapshot1, snapshot2, nullptr, nullptr, 0);
-
- if (res_compare != 1) {
- for (k = 1; k < heapinfo2b->busy_block.size; k++)
- state.equals_to2_(i2 + k, 0) = HeapArea(i1, -1);
- for (k = 1; k < heapinfo1->busy_block.size; k++)
- state.equals_to1_(i1 + k, 0) = HeapArea(i2, -1);
- equal = 1;
- i1 += heapinfo1->busy_block.size;
- }
-
- i2++;
- }
-
- if (not equal) {
- XBT_DEBUG("Block %zu not found (size_used = %zu, addr = %p)", i1, heapinfo1->busy_block.busy_size, addr_block1);
- i1 = state.heaplimit + 1;
- nb_diff1++;
- }
-
- } else { /* Fragmented block */
-
- for (j1 = 0; j1 < (size_t) (BLOCKSIZE >> heapinfo1->type); j1++) {
-
- if (heapinfo1->busy_frag.frag_size[j1] == -1) /* Free fragment_ */
- continue;
-
- if (state.equals_to1_(i1, j1).valid_)
- continue;
-
- addr_frag1 = (void*)((char*)addr_block1 + (j1 << heapinfo1->type));
-
- i2 = 1;
- equal = 0;
-
- /* Try first to associate to same fragment_ in the other heap */
- if (heapinfo2->type == heapinfo1->type && not state.equals_to2_(i1, j1).valid_) {
- addr_block2 = (ADDR2UINT(i1) - 1) * BLOCKSIZE +
- (char *) state.std_heap_copy.heapbase;
- addr_frag2 =
- (void *) ((char *) addr_block2 +
- (j1 << heapinfo2->type));
- int res_compare = compare_heap_area(state, simgrid::mc::ProcessIndexMissing, addr_frag1, addr_frag2,
- snapshot1, snapshot2, nullptr, nullptr, 0);
- if (res_compare != 1)
- equal = 1;
- }
-
- while (i2 < state.heaplimit && not equal) {
-
- const malloc_info* heapinfo2b = (const malloc_info*) MC_region_read(
- heap_region2, &heapinfo_temp2b, &heapinfos2[i2],
- sizeof(malloc_info));
-
- if (heapinfo2b->type == MMALLOC_TYPE_FREE || heapinfo2b->type == MMALLOC_TYPE_HEAPINFO) {
- i2 ++;
- continue;
- }
-
- // We currently do not match fragments with unfragmented blocks (maybe we should).
- if (heapinfo2b->type == MMALLOC_TYPE_UNFRAGMENTED) {
- i2++;
- continue;
- }
-
- if (heapinfo2b->type < 0) {
- fprintf(stderr, "Unknown mmalloc block type.\n");
- abort();
- }
-
- for (j2 = 0; j2 < (size_t) (BLOCKSIZE >> heapinfo2b->type);
- j2++) {
-
- if (i2 == i1 && j2 == j1)
- continue;
-
- if (state.equals_to2_(i2, j2).valid_)
- continue;
-
- addr_block2 = (ADDR2UINT(i2) - 1) * BLOCKSIZE + (char*)state.std_heap_copy.heapbase;
- addr_frag2 = (void*)((char*)addr_block2 + (j2 << heapinfo2b->type));
-
- int res_compare = compare_heap_area(state, simgrid::mc::ProcessIndexMissing, addr_frag1, addr_frag2,
- snapshot2, snapshot2, nullptr, nullptr, 0);
- if (res_compare != 1) {
- equal = 1;
- break;
- }
- }
-
- i2++;
- }
-
- if (not equal) {
- XBT_DEBUG("Block %zu, fragment_ %zu not found (size_used = %zd, address = %p)\n", i1, j1,
- heapinfo1->busy_frag.frag_size[j1], addr_frag1);
- i1 = state.heaplimit + 1;
- nb_diff1++;
- break;
- }
- }
-
- i1++;
- }
- }
-
- /* All blocks/fragments are equal to another block/fragment_ ? */
- size_t i = 1;
- size_t j = 0;
-
- for(i = 1; i < state.heaplimit; i++) {
- const malloc_info* heapinfo1 = (const malloc_info*) MC_region_read(
- heap_region1, &heapinfo_temp1, &heapinfos1[i], sizeof(malloc_info));
-
- if (heapinfo1->type == MMALLOC_TYPE_UNFRAGMENTED && i1 == state.heaplimit && heapinfo1->busy_block.busy_size > 0 &&
- not state.equals_to1_(i, 0).valid_) {
- XBT_DEBUG("Block %zu not found (size used = %zu)", i, heapinfo1->busy_block.busy_size);
- nb_diff1++;
- }
-
- if (heapinfo1->type <= 0)
- continue;
- for (j = 0; j < (size_t) (BLOCKSIZE >> heapinfo1->type); j++)
- if (i1 == state.heaplimit && heapinfo1->busy_frag.frag_size[j] > 0 && not state.equals_to1_(i, j).valid_) {
- XBT_DEBUG("Block %zu, Fragment %zu not found (size used = %zd)", i, j, heapinfo1->busy_frag.frag_size[j]);
- nb_diff1++;
- }
- }
-
- if (i1 == state.heaplimit)
- XBT_DEBUG("Number of blocks/fragments not found in heap1: %d", nb_diff1);
-
- for (i=1; i < state.heaplimit; i++) {
- const malloc_info* heapinfo2 = (const malloc_info*) MC_region_read(
- heap_region2, &heapinfo_temp2, &heapinfos2[i], sizeof(malloc_info));
- if (heapinfo2->type == MMALLOC_TYPE_UNFRAGMENTED && i1 == state.heaplimit && heapinfo2->busy_block.busy_size > 0 &&
- not state.equals_to2_(i, 0).valid_) {
- XBT_DEBUG("Block %zu not found (size used = %zu)", i,
- heapinfo2->busy_block.busy_size);
- nb_diff2++;
- }
-
- if (heapinfo2->type <= 0)
- continue;
-
- for (j = 0; j < (size_t) (BLOCKSIZE >> heapinfo2->type); j++)
- if (i1 == state.heaplimit && heapinfo2->busy_frag.frag_size[j] > 0 && not state.equals_to2_(i, j).valid_) {
- XBT_DEBUG("Block %zu, Fragment %zu not found (size used = %zd)",
- i, j, heapinfo2->busy_frag.frag_size[j]);
- nb_diff2++;
- }
-
- }
-
- if (i1 == state.heaplimit)
- XBT_DEBUG("Number of blocks/fragments not found in heap2: %d", nb_diff2);
-
- return nb_diff1 > 0 || nb_diff2 > 0;
-}
-
-/**
- *
- * @param state
- * @param real_area1 Process address for state 1
- * @param real_area2 Process address for state 2
- * @param snapshot1 Snapshot of state 1
- * @param snapshot2 Snapshot of state 2
- * @param previous
- * @param size
- * @param check_ignore
- */
-static int compare_heap_area_without_type(
- simgrid::mc::StateComparator& state, int process_index,
- const void *real_area1, const void *real_area2,
- simgrid::mc::Snapshot* snapshot1,
- simgrid::mc::Snapshot* snapshot2,
- HeapLocationPairs* previous, int size,
- int check_ignore)
-{
- simgrid::mc::RemoteClient* process = &mc_model_checker->process();
- mc_mem_region_t heap_region1 = MC_get_heap_region(snapshot1);
- mc_mem_region_t heap_region2 = MC_get_heap_region(snapshot2);
-
- for (int i = 0; i < size; ) {
-
- if (check_ignore > 0) {
- ssize_t ignore1 = heap_comparison_ignore_size(
- state.processStates[0].to_ignore, (char *) real_area1 + i);
- if (ignore1 != -1) {
- ssize_t ignore2 = heap_comparison_ignore_size(
- state.processStates[1].to_ignore, (char *) real_area2 + i);
- if (ignore2 == ignore1) {
- if (ignore1 == 0) {
- check_ignore--;
- return 0;
- } else {
- i = i + ignore2;
- check_ignore--;
- continue;
- }
- }
- }
- }
-
- if (MC_snapshot_region_memcmp(((char *) real_area1) + i, heap_region1, ((char *) real_area2) + i, heap_region2, 1) != 0) {
-
- int pointer_align = (i / sizeof(void *)) * sizeof(void *);
- const void* addr_pointed1 = snapshot1->read(
- remote((void**)((char *) real_area1 + pointer_align)), process_index);
- const void* addr_pointed2 = snapshot2->read(
- remote((void**)((char *) real_area2 + pointer_align)), process_index);
-
- if (process->in_maestro_stack(remote(addr_pointed1))
- && process->in_maestro_stack(remote(addr_pointed2))) {
- i = pointer_align + sizeof(void *);
- continue;
- }
-
- if (addr_pointed1 > state.std_heap_copy.heapbase
- && addr_pointed1 < mc_snapshot_get_heap_end(snapshot1)
- && addr_pointed2 > state.std_heap_copy.heapbase
- && addr_pointed2 < mc_snapshot_get_heap_end(snapshot2)) {
- // Both addreses are in the heap:
- int res_compare = compare_heap_area(state ,process_index,
- addr_pointed1, addr_pointed2,
- snapshot1, snapshot2, previous, nullptr, 0);
- if (res_compare == 1)
- return res_compare;
- i = pointer_align + sizeof(void *);
- continue;
- }
-
- return 1;
- }
-
- i++;
- }
-
- return 0;
-}
-
-/**
- *
- * @param state
- * @param real_area1 Process address for state 1
- * @param real_area2 Process address for state 2
- * @param snapshot1 Snapshot of state 1
- * @param snapshot2 Snapshot of state 2
- * @param previous
- * @param type
- * @param area_size either a byte_size or an elements_count (?)
- * @param check_ignore
- * @param pointer_level
- * @return 0 (same), 1 (different), -1 (unknown)
- */
-static int compare_heap_area_with_type(
- simgrid::mc::StateComparator& state, int process_index,
- const void *real_area1, const void *real_area2,
- simgrid::mc::Snapshot* snapshot1,
- simgrid::mc::Snapshot* snapshot2,
- HeapLocationPairs* previous, simgrid::mc::Type* type,
- int area_size, int check_ignore,
- int pointer_level)
-{
- do {
-
- // HACK: This should not happen but in pratice, there are some
- // DW_TAG_typedef without an associated DW_AT_type:
- //<1><538832>: Abbrev Number: 111 (DW_TAG_typedef)
- // <538833> DW_AT_name : (indirect string, offset: 0x2292f3): gregset_t
- // <538837> DW_AT_decl_file : 98
- // <538838> DW_AT_decl_line : 37
- if (type == nullptr)
- return 0;
-
- if (is_stack(real_area1) && is_stack(real_area2))
- return 0;
-
- if (check_ignore > 0) {
- ssize_t ignore1 = heap_comparison_ignore_size(state.processStates[0].to_ignore, real_area1);
- if (ignore1 > 0 && heap_comparison_ignore_size(state.processStates[1].to_ignore, real_area2) == ignore1)
- return 0;
- }
-
- simgrid::mc::Type* subtype;
- simgrid::mc::Type* subsubtype;
- int res;
- int elm_size;
- const void* addr_pointed1;
- const void* addr_pointed2;
-
- mc_mem_region_t heap_region1 = MC_get_heap_region(snapshot1);
- mc_mem_region_t heap_region2 = MC_get_heap_region(snapshot2);
-
- switch (type->type) {
- case DW_TAG_unspecified_type:
- return 1;
-
- case DW_TAG_base_type:
- if (not type->name.empty() && type->name == "char") { /* String, hence random (arbitrary ?) size */
- if (real_area1 == real_area2)
- return -1;
- else
- return MC_snapshot_region_memcmp(real_area1, heap_region1, real_area2, heap_region2, area_size) != 0;
- } else {
- if (area_size != -1 && type->byte_size != area_size)
- return -1;
- else
- return MC_snapshot_region_memcmp(real_area1, heap_region1, real_area2, heap_region2, type->byte_size) != 0;
- }
- break;
-
- case DW_TAG_enumeration_type:
- if (area_size != -1 && type->byte_size != area_size)
- return -1;
- return MC_snapshot_region_memcmp(real_area1, heap_region1, real_area2, heap_region2, type->byte_size) != 0;
-
- case DW_TAG_typedef:
- case DW_TAG_const_type:
- case DW_TAG_volatile_type:
- // Poor man's TCO:
- type = type->subtype;
- continue; // restart
-
- case DW_TAG_array_type:
- subtype = type->subtype;
- switch (subtype->type) {
- case DW_TAG_unspecified_type:
- return 1;
-
- case DW_TAG_base_type:
- case DW_TAG_enumeration_type:
- case DW_TAG_pointer_type:
- case DW_TAG_reference_type:
- case DW_TAG_rvalue_reference_type:
- case DW_TAG_structure_type:
- case DW_TAG_class_type:
- case DW_TAG_union_type:
- if (subtype->full_type)
- subtype = subtype->full_type;
- elm_size = subtype->byte_size;
- break;
- // TODO, just remove the type indirection?
- case DW_TAG_const_type:
- case DW_TAG_typedef:
- case DW_TAG_volatile_type:
- subsubtype = subtype->subtype;
- if (subsubtype->full_type)
- subsubtype = subsubtype->full_type;
- elm_size = subsubtype->byte_size;
- break;
- default:
- return 0;
- break;
- }
- for (int i = 0; i < type->element_count; i++) {
- // TODO, add support for variable stride (DW_AT_byte_stride)
- res = compare_heap_area_with_type(state, process_index, (char*)real_area1 + (i * elm_size),
- (char*)real_area2 + (i * elm_size), snapshot1, snapshot2, previous,
- type->subtype, subtype->byte_size, check_ignore, pointer_level);
- if (res == 1)
- return res;
- }
- return 0;
-
- case DW_TAG_reference_type:
- case DW_TAG_rvalue_reference_type:
- case DW_TAG_pointer_type:
- if (type->subtype && type->subtype->type == DW_TAG_subroutine_type) {
- addr_pointed1 = snapshot1->read(remote((void**)real_area1), process_index);
- addr_pointed2 = snapshot2->read(remote((void**)real_area2), process_index);
- return (addr_pointed1 != addr_pointed2);
- }
- pointer_level++;
- if (pointer_level <= 1) {
- addr_pointed1 = snapshot1->read(remote((void**)real_area1), process_index);
- addr_pointed2 = snapshot2->read(remote((void**)real_area2), process_index);
- if (addr_pointed1 > state.std_heap_copy.heapbase && addr_pointed1 < mc_snapshot_get_heap_end(snapshot1) &&
- addr_pointed2 > state.std_heap_copy.heapbase && addr_pointed2 < mc_snapshot_get_heap_end(snapshot2))
- return compare_heap_area(state, process_index, addr_pointed1, addr_pointed2, snapshot1, snapshot2, previous,
- type->subtype, pointer_level);
- else
- return (addr_pointed1 != addr_pointed2);
- }
- for (size_t i = 0; i < (area_size / sizeof(void*)); i++) {
- addr_pointed1 = snapshot1->read(remote((void**)((char*)real_area1 + i * sizeof(void*))), process_index);
- addr_pointed2 = snapshot2->read(remote((void**)((char*)real_area2 + i * sizeof(void*))), process_index);
- if (addr_pointed1 > state.std_heap_copy.heapbase && addr_pointed1 < mc_snapshot_get_heap_end(snapshot1) &&
- addr_pointed2 > state.std_heap_copy.heapbase && addr_pointed2 < mc_snapshot_get_heap_end(snapshot2))
- res = compare_heap_area(state, process_index, addr_pointed1, addr_pointed2, snapshot1, snapshot2, previous,
- type->subtype, pointer_level);
- else
- res = (addr_pointed1 != addr_pointed2);
- if (res == 1)
- return res;
- }
- return 0;
-
- case DW_TAG_structure_type:
- case DW_TAG_class_type:
- if (type->full_type)
- type = type->full_type;
- if (area_size != -1 && type->byte_size != area_size) {
- if (area_size <= type->byte_size || area_size % type->byte_size != 0)
- return -1;
- for (size_t i = 0; i < (size_t)(area_size / type->byte_size); i++) {
- int res = compare_heap_area_with_type(state, process_index, (char*)real_area1 + i * type->byte_size,
- (char*)real_area2 + i * type->byte_size, snapshot1, snapshot2,
- previous, type, -1, check_ignore, 0);
- if (res == 1)
- return res;
- }
- } else {
- for (simgrid::mc::Member& member : type->members) {
- // TODO, optimize this? (for the offset case)
- void* real_member1 = simgrid::dwarf::resolve_member(real_area1, type, &member,
- (simgrid::mc::AddressSpace*)snapshot1, process_index);
- void* real_member2 = simgrid::dwarf::resolve_member(real_area2, type, &member,
- (simgrid::mc::AddressSpace*)snapshot2, process_index);
- int res = compare_heap_area_with_type(state, process_index, real_member1, real_member2, snapshot1,
- snapshot2, previous, member.type, -1, check_ignore, 0);
- if (res == 1)
- return res;
- }
- }
- return 0;
-
- case DW_TAG_union_type:
- return compare_heap_area_without_type(state, process_index, real_area1, real_area2, snapshot1, snapshot2,
- previous, type->byte_size, check_ignore);
-
- default:
- return 0;
- }
-
- xbt_die("Unreachable");
- } while (true);
-}
-
-/** Infer the type of a part of the block from the type of the block
- *
- * TODO, handle DW_TAG_array_type as well as arrays of the object ((*p)[5], p[5])
- *
- * TODO, handle subfields ((*p).bar.foo, (*p)[5].bar…)
- *
- * @param type DWARF type ID of the root address
- * @param area_size
- * @return DWARF type ID for given offset
- */
-static simgrid::mc::Type* get_offset_type(void *real_base_address, simgrid::mc::Type* type,
- int offset, int area_size,
- simgrid::mc::Snapshot* snapshot, int process_index)
-{
-
- // Beginning of the block, the infered variable type if the type of the block:
- if (offset == 0)
- return type;
-
- switch (type->type) {
-
- case DW_TAG_structure_type:
- case DW_TAG_class_type:
- if (type->full_type)
- type = type->full_type;
- if (area_size != -1 && type->byte_size != area_size) {
- if (area_size > type->byte_size && area_size % type->byte_size == 0)
- return type;
- else
- return nullptr;
- }
-
- for (simgrid::mc::Member& member : type->members) {
- if (member.has_offset_location()) {
- // We have the offset, use it directly (shortcut):
- if (member.offset() == offset)
- return member.type;
- } else {
- void* real_member = simgrid::dwarf::resolve_member(real_base_address, type, &member, snapshot, process_index);
- if ((char*)real_member - (char*)real_base_address == offset)
- return member.type;
- }
- }
- return nullptr;
-
- default:
- /* FIXME: other cases ? */
- return nullptr;
-
- }
-}
-
-/**
- *
- * @param area1 Process address for state 1
- * @param area2 Process address for state 2
- * @param snapshot1 Snapshot of state 1
- * @param snapshot2 Snapshot of state 2
- * @param previous Pairs of blocks already compared on the current path (or nullptr)
- * @param type_id Type of variable
- * @param pointer_level
- * @return 0 (same), 1 (different), -1
- */
-static
-int compare_heap_area(simgrid::mc::StateComparator& state, int process_index,
- const void *area1, const void *area2,
- simgrid::mc::Snapshot* snapshot1,
- simgrid::mc::Snapshot* snapshot2,
- HeapLocationPairs* previous,
- simgrid::mc::Type* type, int pointer_level)
-{
- simgrid::mc::RemoteClient* process = &mc_model_checker->process();
-
- ssize_t block1;
- ssize_t block2;
- ssize_t size;
- int check_ignore = 0;
-
- int type_size = -1;
- int offset1 = 0;
- int offset2 = 0;
- int new_size1 = -1;
- int new_size2 = -1;
-
- simgrid::mc::Type* new_type1 = nullptr;
- simgrid::mc::Type* new_type2 = nullptr;
-
- bool match_pairs = false;
-
- // This is the address of std_heap->heapinfo in the application process:
- void* heapinfo_address = &((xbt_mheap_t) process->heap_address)->heapinfo;
-
- const malloc_info* heapinfos1 = snapshot1->read(remote((const malloc_info**)heapinfo_address), process_index);
- const malloc_info* heapinfos2 = snapshot2->read(remote((const malloc_info**)heapinfo_address), process_index);
-
- malloc_info heapinfo_temp1;
- malloc_info heapinfo_temp2;
-
- simgrid::mc::HeapLocationPairs current;
- if (previous == nullptr) {
- previous = ¤t;
- match_pairs = true;
- }
-
- // Get block number:
- block1 = ((char*)area1 - (char*)state.std_heap_copy.heapbase) / BLOCKSIZE + 1;
- block2 = ((char*)area2 - (char*)state.std_heap_copy.heapbase) / BLOCKSIZE + 1;
-
- // If either block is a stack block:
- if (is_block_stack((int) block1) && is_block_stack((int) block2)) {
- previous->insert(simgrid::mc::makeHeapLocationPair(block1, -1, block2, -1));
- if (match_pairs)
- state.match_equals(previous);
- return 0;
- }
-
- // If either block is not in the expected area of memory:
- if (((char*)area1 < (char*)state.std_heap_copy.heapbase) || (block1 > (ssize_t)state.processStates[0].heapsize) ||
- (block1 < 1) || ((char*)area2 < (char*)state.std_heap_copy.heapbase) ||
- (block2 > (ssize_t)state.processStates[1].heapsize) || (block2 < 1)) {
- return 1;
- }
-
- // Process address of the block:
- void* real_addr_block1 = (ADDR2UINT(block1) - 1) * BLOCKSIZE + (char*)state.std_heap_copy.heapbase;
- void* real_addr_block2 = (ADDR2UINT(block2) - 1) * BLOCKSIZE + (char*)state.std_heap_copy.heapbase;
-
- if (type) {
- if (type->full_type)
- type = type->full_type;
-
- // This assume that for "boring" types (volatile ...) byte_size is absent:
- while (type->byte_size == 0 && type->subtype != nullptr)
- type = type->subtype;
-
- // Find type_size:
- if (type->type == DW_TAG_pointer_type ||
- (type->type == DW_TAG_base_type && not type->name.empty() && type->name == "char"))
- type_size = -1;
- else
- type_size = type->byte_size;
-
- }
-
- mc_mem_region_t heap_region1 = MC_get_heap_region(snapshot1);
- mc_mem_region_t heap_region2 = MC_get_heap_region(snapshot2);
-
- const malloc_info* heapinfo1 = (const malloc_info*) MC_region_read(
- heap_region1, &heapinfo_temp1, &heapinfos1[block1], sizeof(malloc_info));
- const malloc_info* heapinfo2 = (const malloc_info*) MC_region_read(
- heap_region2, &heapinfo_temp2, &heapinfos2[block2], sizeof(malloc_info));
-
- if ((heapinfo1->type == MMALLOC_TYPE_FREE || heapinfo1->type==MMALLOC_TYPE_HEAPINFO)
- && (heapinfo2->type == MMALLOC_TYPE_FREE || heapinfo2->type ==MMALLOC_TYPE_HEAPINFO)) {
- /* Free block */
- if (match_pairs)
- state.match_equals(previous);
- return 0;
- }
-
- if (heapinfo1->type == MMALLOC_TYPE_UNFRAGMENTED && heapinfo2->type == MMALLOC_TYPE_UNFRAGMENTED) {
- /* Complete block */
-
- // TODO, lookup variable type from block type as done for fragmented blocks
-
- if (state.equals_to1_(block1, 0).valid_ && state.equals_to2_(block2, 0).valid_ &&
- state.blocksEqual(block1, block2)) {
- if (match_pairs)
- state.match_equals(previous);
- return 0;
- }
-
- if (type_size != -1 && type_size != (ssize_t)heapinfo1->busy_block.busy_size &&
- type_size != (ssize_t)heapinfo2->busy_block.busy_size &&
- (type->name.empty() || type->name == "struct s_smx_context")) {
- if (match_pairs)
- state.match_equals(previous);
- return -1;
- }
-
- if (heapinfo1->busy_block.size != heapinfo2->busy_block.size)
- return 1;
- if (heapinfo1->busy_block.busy_size != heapinfo2->busy_block.busy_size)
- return 1;
-
- if (not previous->insert(simgrid::mc::makeHeapLocationPair(block1, -1, block2, -1)).second) {
- if (match_pairs)
- state.match_equals(previous);
- return 0;
- }
-
- size = heapinfo1->busy_block.busy_size;
-
- // Remember (basic) type inference.
- // The current data structure only allows us to do this for the whole block.
- if (type != nullptr && area1 == real_addr_block1)
- state.types1_(block1, 0) = type;
- if (type != nullptr && area2 == real_addr_block2)
- state.types2_(block2, 0) = type;
-
- if (size <= 0) {
- if (match_pairs)
- state.match_equals(previous);
- return 0;
- }
-
- if (heapinfo1->busy_block.ignore > 0
- && heapinfo2->busy_block.ignore == heapinfo1->busy_block.ignore)
- check_ignore = heapinfo1->busy_block.ignore;
-
- } else if ((heapinfo1->type > 0) && (heapinfo2->type > 0)) { /* Fragmented block */
-
- // Fragment number:
- ssize_t frag1 = ((uintptr_t)(ADDR2UINT(area1) % (BLOCKSIZE))) >> heapinfo1->type;
- ssize_t frag2 = ((uintptr_t)(ADDR2UINT(area2) % (BLOCKSIZE))) >> heapinfo2->type;
-
- // Process address of the fragment_:
- void* real_addr_frag1 = (void*)((char*)real_addr_block1 + (frag1 << heapinfo1->type));
- void* real_addr_frag2 = (void*)((char*)real_addr_block2 + (frag2 << heapinfo2->type));
-
- // Check the size of the fragments against the size of the type:
- if (type_size != -1) {
- if (heapinfo1->busy_frag.frag_size[frag1] == -1 || heapinfo2->busy_frag.frag_size[frag2] == -1) {
- if (match_pairs)
- state.match_equals(previous);
- return -1;
- }
- // ?
- if (type_size != heapinfo1->busy_frag.frag_size[frag1]
- || type_size != heapinfo2->busy_frag.frag_size[frag2]) {
- if (match_pairs)
- state.match_equals(previous);
- return -1;
- }
- }
-
- // Check if the blocks are already matched together:
- if (state.equals_to1_(block1, frag1).valid_ && state.equals_to2_(block2, frag2).valid_ && offset1 == offset2 &&
- state.fragmentsEqual(block1, frag1, block2, frag2)) {
- if (match_pairs)
- state.match_equals(previous);
- return 0;
- }
- // Compare the size of both fragments:
- if (heapinfo1->busy_frag.frag_size[frag1] != heapinfo2->busy_frag.frag_size[frag2]) {
- if (type_size == -1) {
- if (match_pairs)
- state.match_equals(previous);
- return -1;
- } else
- return 1;
- }
-
- // Size of the fragment_:
- size = heapinfo1->busy_frag.frag_size[frag1];
-
- // Remember (basic) type inference.
- // The current data structure only allows us to do this for the whole fragment_.
- if (type != nullptr && area1 == real_addr_frag1)
- state.types1_(block1, frag1) = type;
- if (type != nullptr && area2 == real_addr_frag2)
- state.types2_(block2, frag2) = type;
-
- // The type of the variable is already known:
- if (type) {
- new_type1 = new_type2 = type;
- }
- // Type inference from the block type.
- else if (state.types1_(block1, frag1) != nullptr || state.types2_(block2, frag2) != nullptr) {
-
- offset1 = (char*)area1 - (char*)real_addr_frag1;
- offset2 = (char*)area2 - (char*)real_addr_frag2;
-
- if (state.types1_(block1, frag1) != nullptr && state.types2_(block2, frag2) != nullptr) {
- new_type1 =
- get_offset_type(real_addr_frag1, state.types1_(block1, frag1), offset1, size, snapshot1, process_index);
- new_type2 =
- get_offset_type(real_addr_frag2, state.types2_(block2, frag2), offset1, size, snapshot2, process_index);
- } else if (state.types1_(block1, frag1) != nullptr) {
- new_type1 =
- get_offset_type(real_addr_frag1, state.types1_(block1, frag1), offset1, size, snapshot1, process_index);
- new_type2 =
- get_offset_type(real_addr_frag2, state.types1_(block1, frag1), offset2, size, snapshot2, process_index);
- } else if (state.types2_(block2, frag2) != nullptr) {
- new_type1 =
- get_offset_type(real_addr_frag1, state.types2_(block2, frag2), offset1, size, snapshot1, process_index);
- new_type2 =
- get_offset_type(real_addr_frag2, state.types2_(block2, frag2), offset2, size, snapshot2, process_index);
- } else {
- if (match_pairs)
- state.match_equals(previous);
- return -1;
- }
-
- if (new_type1 != nullptr && new_type2 != nullptr && new_type1 != new_type2) {
-
- type = new_type1;
- while (type->byte_size == 0 && type->subtype != nullptr)
- type = type->subtype;
- new_size1 = type->byte_size;
-
- type = new_type2;
- while (type->byte_size == 0 && type->subtype != nullptr)
- type = type->subtype;
- new_size2 = type->byte_size;
-
- } else {
- if (match_pairs)
- state.match_equals(previous);
- return -1;
- }
- }
-
- if (new_size1 > 0 && new_size1 == new_size2) {
- type = new_type1;
- size = new_size1;
- }
-
- if (offset1 == 0 && offset2 == 0 &&
- not previous->insert(simgrid::mc::makeHeapLocationPair(block1, frag1, block2, frag2)).second) {
- if (match_pairs)
- state.match_equals(previous);
- return 0;
- }
-
- if (size <= 0) {
- if (match_pairs)
- state.match_equals(previous);
- return 0;
- }
-
- if ((heapinfo1->busy_frag.ignore[frag1] > 0) &&
- (heapinfo2->busy_frag.ignore[frag2] == heapinfo1->busy_frag.ignore[frag1]))
- check_ignore = heapinfo1->busy_frag.ignore[frag1];
-
- } else
- return 1;
-
-
- /* Start comparison */
- int res_compare;
- if (type)
- res_compare = compare_heap_area_with_type(state, process_index, area1, area2, snapshot1, snapshot2, previous, type,
- size, check_ignore, pointer_level);
- else
- res_compare = compare_heap_area_without_type(state, process_index, area1, area2, snapshot1, snapshot2, previous,
- size, check_ignore);
-
- if (res_compare == 1)
- return res_compare;
-
- if (match_pairs)
- state.match_equals(previous);
- return 0;
-}
-
-}
-}
-
-/************************** Snapshot comparison *******************************/
-/******************************************************************************/
-
-static int compare_areas_with_type(simgrid::mc::StateComparator& state,
- int process_index,
- void* real_area1, simgrid::mc::Snapshot* snapshot1, mc_mem_region_t region1,
- void* real_area2, simgrid::mc::Snapshot* snapshot2, mc_mem_region_t region2,
- simgrid::mc::Type* type, int pointer_level)
-{
- simgrid::mc::RemoteClient* process = &mc_model_checker->process();
-
- simgrid::mc::Type* subtype;
- simgrid::mc::Type* subsubtype;
- int elm_size;
- int i;
- int res;
-
- do {
- switch (type->type) {
- case DW_TAG_unspecified_type:
- return 1;
-
- case DW_TAG_base_type:
- case DW_TAG_enumeration_type:
- case DW_TAG_union_type:
- return MC_snapshot_region_memcmp(real_area1, region1, real_area2, region2, type->byte_size) != 0;
- case DW_TAG_typedef:
- case DW_TAG_volatile_type:
- case DW_TAG_const_type:
- // Poor man's TCO:
- type = type->subtype;
- continue; // restart
- case DW_TAG_array_type:
- subtype = type->subtype;
- switch (subtype->type) {
- case DW_TAG_unspecified_type:
- return 1;
-
- case DW_TAG_base_type:
- case DW_TAG_enumeration_type:
- case DW_TAG_pointer_type:
- case DW_TAG_reference_type:
- case DW_TAG_rvalue_reference_type:
- case DW_TAG_structure_type:
- case DW_TAG_class_type:
- case DW_TAG_union_type:
- if (subtype->full_type)
- subtype = subtype->full_type;
- elm_size = subtype->byte_size;
- break;
- case DW_TAG_const_type:
- case DW_TAG_typedef:
- case DW_TAG_volatile_type:
- subsubtype = subtype->subtype;
- if (subsubtype->full_type)
- subsubtype = subsubtype->full_type;
- elm_size = subsubtype->byte_size;
- break;
- default:
- return 0;
- break;
- }
- for (i = 0; i < type->element_count; i++) {
- size_t off = i * elm_size;
- res = compare_areas_with_type(state, process_index, (char*)real_area1 + off, snapshot1, region1,
- (char*)real_area2 + off, snapshot2, region2, type->subtype, pointer_level);
- if (res == 1)
- return res;
- }
- break;
- case DW_TAG_pointer_type:
- case DW_TAG_reference_type:
- case DW_TAG_rvalue_reference_type: {
- void* addr_pointed1 = MC_region_read_pointer(region1, real_area1);
- void* addr_pointed2 = MC_region_read_pointer(region2, real_area2);
-
- if (type->subtype && type->subtype->type == DW_TAG_subroutine_type)
- return (addr_pointed1 != addr_pointed2);
- if (addr_pointed1 == nullptr && addr_pointed2 == nullptr)
- return 0;
- if (addr_pointed1 == nullptr || addr_pointed2 == nullptr)
- return 1;
- if (not state.compared_pointers.insert(std::make_pair(addr_pointed1, addr_pointed2)).second)
- return 0;
-
- pointer_level++;
-
- // Some cases are not handled here:
- // * the pointers lead to different areas (one to the heap, the other to the RW segment ...)
- // * a pointer leads to the read-only segment of the current object
- // * a pointer lead to a different ELF object
-
- if (addr_pointed1 > process->heap_address && addr_pointed1 < mc_snapshot_get_heap_end(snapshot1)) {
- if (not(addr_pointed2 > process->heap_address && addr_pointed2 < mc_snapshot_get_heap_end(snapshot2)))
- return 1;
- // The pointers are both in the heap:
- return simgrid::mc::compare_heap_area(state, process_index, addr_pointed1, addr_pointed2, snapshot1,
- snapshot2, nullptr, type->subtype, pointer_level);
-
- } else if (region1->contain(simgrid::mc::remote(addr_pointed1))) {
- // The pointers are both in the current object R/W segment:
- if (not region2->contain(simgrid::mc::remote(addr_pointed2)))
- return 1;
- if (not type->type_id)
- return (addr_pointed1 != addr_pointed2);
- else
- return compare_areas_with_type(state, process_index, addr_pointed1, snapshot1, region1, addr_pointed2,
- snapshot2, region2, type->subtype, pointer_level);
- } else {
-
- // TODO, We do not handle very well the case where
- // it belongs to a different (non-heap) region from the current one.
-
- return (addr_pointed1 != addr_pointed2);
- }
- break;
- }
- case DW_TAG_structure_type:
- case DW_TAG_class_type:
- for (simgrid::mc::Member& member : type->members) {
- void* member1 = simgrid::dwarf::resolve_member(real_area1, type, &member, snapshot1, process_index);
- void* member2 = simgrid::dwarf::resolve_member(real_area2, type, &member, snapshot2, process_index);
- mc_mem_region_t subregion1 = mc_get_region_hinted(member1, snapshot1, process_index, region1);
- mc_mem_region_t subregion2 = mc_get_region_hinted(member2, snapshot2, process_index, region2);
- res = compare_areas_with_type(state, process_index, member1, snapshot1, subregion1, member2, snapshot2,
- subregion2, member.type, pointer_level);
- if (res == 1)
- return res;
- }
- break;
- case DW_TAG_subroutine_type:
- return -1;
- break;
- default:
- XBT_VERB("Unknown case: %d", type->type);
- break;
- }
-
- return 0;
- } while (true);
-}
-
-static int compare_global_variables(
- simgrid::mc::StateComparator& state,
- simgrid::mc::ObjectInformation* object_info,
- int process_index,
- mc_mem_region_t r1, mc_mem_region_t r2,
- simgrid::mc::Snapshot* snapshot1, simgrid::mc::Snapshot* snapshot2)
-{
- xbt_assert(r1 && r2, "Missing region.");
-
-#if HAVE_SMPI
- if (r1->storage_type() == simgrid::mc::StorageType::Privatized) {
- xbt_assert(process_index >= 0);
- if (r2->storage_type() != simgrid::mc::StorageType::Privatized)
- return 1;
-
- size_t process_count = MC_smpi_process_count();
- xbt_assert(process_count == r1->privatized_data().size()
- && process_count == r2->privatized_data().size());
-
- // Compare the global variables separately for each simulates process:
- for (size_t process_index = 0; process_index < process_count; process_index++) {
- if (compare_global_variables(state,
- object_info, process_index,
- &r1->privatized_data()[process_index],
- &r2->privatized_data()[process_index],
- snapshot1, snapshot2))
- return 1;
- }
- return 0;
- }
-#else
- xbt_assert(r1->storage_type() != simgrid::mc::StorageType::Privatized);
-#endif
- xbt_assert(r2->storage_type() != simgrid::mc::StorageType::Privatized);
-
- std::vector<simgrid::mc::Variable>& variables = object_info->global_variables;
-
- for (simgrid::mc::Variable const& current_var : variables) {
-
- // If the variable is not in this object, skip it:
- // We do not expect to find a pointer to something which is not reachable
- // by the global variables.
- if ((char *) current_var.address < (char *) object_info->start_rw
- || (char *) current_var.address > (char *) object_info->end_rw)
- continue;
-
- simgrid::mc::Type* bvariable_type = current_var.type;
- int res = compare_areas_with_type(state, process_index,
- (char *) current_var.address, snapshot1, r1,
- (char *) current_var.address, snapshot2, r2,
- bvariable_type, 0);
- if (res == 1) {
- XBT_VERB("Global variable %s (%p) is different between snapshots",
- current_var.name.c_str(),
- (char *) current_var.address);
- return 1;
- }
- }
-
- return 0;
-}
-
-static int compare_local_variables(simgrid::mc::StateComparator& state,
- int process_index,
- simgrid::mc::Snapshot* snapshot1,
- simgrid::mc::Snapshot* snapshot2,
- mc_snapshot_stack_t stack1,
- mc_snapshot_stack_t stack2)
-{
- if (stack1->local_variables.size() != stack2->local_variables.size()) {
- XBT_VERB("Different number of local variables");
- return 1;
- }
-
- unsigned int cursor = 0;
- local_variable_t current_var1;
- local_variable_t current_var2;
- while (cursor < stack1->local_variables.size()) {
- current_var1 = &stack1->local_variables[cursor];
- current_var2 = &stack1->local_variables[cursor];
- if (current_var1->name != current_var2->name
- || current_var1->subprogram != current_var2->subprogram
- || current_var1->ip != current_var2->ip) {
- // TODO, fix current_varX->subprogram->name to include name if DW_TAG_inlined_subprogram
- XBT_VERB
- ("Different name of variable (%s - %s) "
- "or frame (%s - %s) or ip (%lu - %lu)",
- current_var1->name.c_str(),
- current_var2->name.c_str(),
- current_var1->subprogram->name.c_str(),
- current_var2->subprogram->name.c_str(),
- current_var1->ip, current_var2->ip);
- return 1;
- }
- // TODO, fix current_varX->subprogram->name to include name if DW_TAG_inlined_subprogram
-
- simgrid::mc::Type* subtype = current_var1->type;
- int res = compare_areas_with_type(
- state, process_index, current_var1->address, snapshot1,
- mc_get_snapshot_region(current_var1->address, snapshot1, process_index), current_var2->address, snapshot2,
- mc_get_snapshot_region(current_var2->address, snapshot2, process_index), subtype, 0);
-
- if (res == 1) {
- // TODO, fix current_varX->subprogram->name to include name if DW_TAG_inlined_subprogram
- XBT_VERB("Local variable %s (%p - %p) in frame %s "
- "is different between snapshots",
- current_var1->name.c_str(), current_var1->address, current_var2->address,
- current_var1->subprogram->name.c_str());
- return res;
- }
- cursor++;
- }
- return 0;
-}
-
-namespace simgrid {
-namespace mc {
-
-static std::unique_ptr<simgrid::mc::StateComparator> state_comparator;
-
-int snapshot_compare(int num1, simgrid::mc::Snapshot* s1, int num2, simgrid::mc::Snapshot* s2)
-{
- // TODO, make this a field of ModelChecker or something similar
-
- if (state_comparator == nullptr)
- state_comparator = std::unique_ptr<StateComparator>(new StateComparator());
- else
- state_comparator->clear();
-
- simgrid::mc::RemoteClient* process = &mc_model_checker->process();
-
- int errors = 0;
-
- int hash_result = 0;
- if (_sg_mc_hash) {
- hash_result = (s1->hash != s2->hash);
- if (hash_result) {
- XBT_VERB("(%d - %d) Different hash: 0x%" PRIx64 "--0x%" PRIx64, num1, num2, s1->hash, s2->hash);
-#ifndef MC_DEBUG
- return 1;
-#endif
- } else
- XBT_VERB("(%d - %d) Same hash: 0x%" PRIx64, num1, num2, s1->hash);
- }
-
- /* Compare enabled processes */
- if (s1->enabled_processes != s2->enabled_processes) {
- XBT_VERB("(%d - %d) Different amount of enabled processes", num1, num2);
- return 1;
- }
-
- /* Compare size of stacks */
- int is_diff = 0;
- for (unsigned long i = 0; i < s1->stacks.size(); i++) {
- size_t size_used1 = s1->stack_sizes[i];
- size_t size_used2 = s2->stack_sizes[i];
- if (size_used1 != size_used2) {
-#ifdef MC_DEBUG
- XBT_DEBUG("(%d - %d) Different size used in stacks: %zu - %zu", num1, num2, size_used1, size_used2);
- errors++;
- is_diff = 1;
-#else
-#ifdef MC_VERBOSE
- XBT_VERB("(%d - %d) Different size used in stacks: %zu - %zu", num1, num2, size_used1, size_used2);
-#endif
- return 1;
-#endif
- }
- }
- if (is_diff) // do not proceed if there is any stacks that don't match
- return 1;
-
- /* Init heap information used in heap comparison algorithm */
- xbt_mheap_t heap1 = (xbt_mheap_t)s1->read_bytes(
- alloca(sizeof(struct mdesc)), sizeof(struct mdesc),
- remote(process->heap_address),
- simgrid::mc::ProcessIndexMissing, simgrid::mc::ReadOptions::lazy());
- xbt_mheap_t heap2 = (xbt_mheap_t)s2->read_bytes(
- alloca(sizeof(struct mdesc)), sizeof(struct mdesc),
- remote(process->heap_address),
- simgrid::mc::ProcessIndexMissing, simgrid::mc::ReadOptions::lazy());
- int res_init = state_comparator->initHeapInformation(heap1, heap2, &s1->to_ignore, &s2->to_ignore);
-
- if (res_init == -1) {
-#ifdef MC_DEBUG
- XBT_DEBUG("(%d - %d) Different heap information", num1, num2);
- errors++;
-#else
-#ifdef MC_VERBOSE
- XBT_VERB("(%d - %d) Different heap information", num1, num2);
-#endif
-
- return 1;
-#endif
- }
-
- /* Stacks comparison */
- int diff_local = 0;
- for (unsigned int cursor = 0; cursor < s1->stacks.size(); cursor++) {
- mc_snapshot_stack_t stack1 = &s1->stacks[cursor];
- mc_snapshot_stack_t stack2 = &s2->stacks[cursor];
-
- if (stack1->process_index != stack2->process_index) {
- diff_local = 1;
- XBT_DEBUG("(%d - %d) Stacks with different process index (%i vs %i)", num1, num2,
- stack1->process_index, stack2->process_index);
- }
- else diff_local = compare_local_variables(*state_comparator,
- stack1->process_index, s1, s2, stack1, stack2);
- if (diff_local > 0) {
-#ifdef MC_DEBUG
- XBT_DEBUG("(%d - %d) Different local variables between stacks %d", num1,
- num2, cursor + 1);
- errors++;
-#else
-
-#ifdef MC_VERBOSE
- XBT_VERB("(%d - %d) Different local variables between stacks %u", num1, num2, cursor + 1);
-#endif
-
- return 1;
-#endif
- }
- }
-
- size_t regions_count = s1->snapshot_regions.size();
- // TODO, raise a difference instead?
- xbt_assert(regions_count == s2->snapshot_regions.size());
-
- for (size_t k = 0; k != regions_count; ++k) {
- mc_mem_region_t region1 = s1->snapshot_regions[k].get();
- mc_mem_region_t region2 = s2->snapshot_regions[k].get();
-
- // Preconditions:
- if (region1->region_type() != simgrid::mc::RegionType::Data)
- continue;
-
- xbt_assert(region1->region_type() == region2->region_type());
- xbt_assert(region1->object_info() == region2->object_info());
- xbt_assert(region1->object_info());
-
- std::string const& name = region1->object_info()->file_name;
-
- /* Compare global variables */
- if (compare_global_variables(*state_comparator, region1->object_info(), simgrid::mc::ProcessIndexDisabled, region1,
- region2, s1, s2)) {
-
-#ifdef MC_DEBUG
- XBT_DEBUG("(%d - %d) Different global variables in %s",
- num1, num2, name.c_str());
- errors++;
-#else
-#ifdef MC_VERBOSE
- XBT_VERB("(%d - %d) Different global variables in %s",
- num1, num2, name.c_str());
-#endif
-
- return 1;
-#endif
- }
- }
-
- /* Compare heap */
- if (simgrid::mc::mmalloc_compare_heap(*state_comparator, s1, s2) > 0) {
-
-#ifdef MC_DEBUG
- XBT_DEBUG("(%d - %d) Different heap (mmalloc_compare)", num1, num2);
- errors++;
-#else
-
-#ifdef MC_VERBOSE
- XBT_VERB("(%d - %d) Different heap (mmalloc_compare)", num1, num2);
-#endif
- return 1;
-#endif
- }
-
-#ifdef MC_VERBOSE
- if (errors || hash_result)
- XBT_VERB("(%d - %d) Difference found", num1, num2);
- else
- XBT_VERB("(%d - %d) No difference found", num1, num2);
-#endif
-
-#if defined(MC_DEBUG) && defined(MC_VERBOSE)
- if (_sg_mc_hash) {
- // * false positive SHOULD be avoided.
- // * There MUST not be any false negative.
-
- XBT_VERB("(%d - %d) State equality hash test is %s %s", num1, num2,
- (hash_result != 0) == (errors != 0) ? "true" : "false", not hash_result ? "positive" : "negative");
- }
-#endif
-
- return errors > 0 || hash_result;
-}
-
-}
-}