+++ /dev/null
-/* Copyright (c) 2012-2015. 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. */
-
-#include <cinttypes>
-
-#include <utility>
-#include <unordered_set>
-
-#include <xbt/sysdep.h>
-
-#include "src/internal_config.h"
-#include "src/mc/mc_forward.hpp"
-#include "src/mc/mc_safety.h"
-#include "src/mc/mc_private.h"
-#include "src/mc/mc_smx.h"
-#include "src/mc/mc_dwarf.hpp"
-#include "src/mc/malloc.hpp"
-#include "src/mc/Frame.hpp"
-#include "src/mc/ObjectInformation.hpp"
-#include "src/mc/Variable.hpp"
-
-#if HAVE_SMPI
-#include "src/smpi/private.h"
-#endif
-
-#include "xbt/mmalloc.h"
-#include "src/xbt/mmalloc/mmprivate.h"
-
-using simgrid::mc::remote;
-
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_compare, xbt,
- "Logging specific to mc_compare in mc");
-
-namespace simgrid {
-namespace mc {
-
-/** A hash which works with more stuff
- *
- * It can hash pairs: the standard hash currently doesn't include this.
- */
-template<class X> struct hash : public std::hash<X> {};
-
-template<class X, class Y>
-struct hash<std::pair<X,Y>> {
- std::size_t operator()(std::pair<X,Y>const& x) const
- {
- struct hash<X> h1;
- struct hash<X> h2;
- return h1(x.first) ^ h2(x.second);
- }
-};
-
-struct ComparisonState {
- std::unordered_set<std::pair<void*, void*>, hash<std::pair<void*, void*>>> compared_pointers;
-};
-
-}
-}
-
-using simgrid::mc::ComparisonState;
-
-/************************** Snapshot comparison *******************************/
-/******************************************************************************/
-
-static int compare_areas_with_type(ComparisonState& 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::Process* process = &mc_model_checker->process();
-
- simgrid::mc::Type* subtype;
- simgrid::mc::Type* subsubtype;
- int elm_size, i, res;
-
- top:
- 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;
- goto top;
- 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 (!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 (!
- (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(process_index, addr_pointed1, addr_pointed2, snapshot1,
- snapshot2, nullptr, type->subtype, pointer_level);
- }
-
- // The pointers are both in the current object R/W segment:
- else if (region1->contain(simgrid::mc::remote(addr_pointed1))) {
- if (!region2->contain(simgrid::mc::remote(addr_pointed2)))
- return 1;
- if (!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);
- }
-
- // TODO, We do not handle very well the case where
- // it belongs to a different (non-heap) region from the current one.
-
- else
- 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;
-}
-
-static int compare_global_variables(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++) {
- int is_diff = compare_global_variables(object_info, process_index,
- &r1->privatized_data()[process_index],
- &r2->privatized_data()[process_index],
- snapshot1, snapshot2);
- if (is_diff) return 1;
- }
- return 0;
- }
-#else
- xbt_assert(r1->storage_type() != simgrid::mc::StorageType::Privatized);
-#endif
- xbt_assert(r2->storage_type() != simgrid::mc::StorageType::Privatized);
-
- ComparisonState state;
-
- std::vector<simgrid::mc::Variable>& variables = object_info->global_variables;
-
- for (simgrid::mc::Variable& 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(int process_index,
- simgrid::mc::Snapshot* snapshot1,
- simgrid::mc::Snapshot* snapshot2,
- mc_snapshot_stack_t stack1,
- mc_snapshot_stack_t stack2)
-{
- ComparisonState state;
-
- 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, current_var2;
- int res;
- 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;
- 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 {
-
-int snapshot_compare(int num1, simgrid::mc::Snapshot* s1, int num2, simgrid::mc::Snapshot* s2)
-{
- simgrid::mc::Process* process = &mc_model_checker->process();
-
- int errors = 0;
- int res_init;
-
- 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 enabled processes", num1, num2);
- // return 1; ??
- }
-
- unsigned long i = 0;
- size_t size_used1, size_used2;
- int is_diff = 0;
-
- /* Compare size of stacks */
- while (i < s1->stacks.size()) {
- size_used1 = s1->stack_sizes[i];
- 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
- }
- i++;
- }
-
- /* 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());
- res_init = simgrid::mc::init_heap_information(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 */
- unsigned cursor = 0;
- int diff_local = 0;
-#ifdef MC_DEBUG
- is_diff = 0;
-#endif
- mc_snapshot_stack_t stack1, stack2;
- while (cursor < s1->stacks.size()) {
- stack1 = &s1->stacks[cursor];
- 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(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++;
- is_diff = 1;
-#else
-
-#ifdef MC_VERBOSE
- XBT_VERB("(%d - %d) Different local variables between stacks %d", num1,
- num2, cursor + 1);
-#endif
-
- simgrid::mc::reset_heap_information();
-
- return 1;
-#endif
- }
- cursor++;
- }
-
- 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 */
- is_diff =
- compare_global_variables(region1->object_info(),
- simgrid::mc::ProcessIndexDisabled,
- region1, region2,
- s1, s2);
-
- if (is_diff != 0) {
-#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(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
- }
-
- simgrid::mc::reset_heap_information();
-
-#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",
- !hash_result ? "positive" : "negative");
- }
-#endif
-
- return errors > 0 || hash_result;
-}
-
-}
-}
