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[mc] Hack to workaround weird/unexpected DWARF
[simgrid.git] / src / mc / mc_diff.cpp
index b8fc44c..89b5b54 100644 (file)
-/* mc_diff - Memory snapshooting and comparison                             */
-
-/* Copyright (c) 2008-2014. The SimGrid Team.
+/* Copyright (c) 2008-2015. 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 "xbt/ex_interface.h"   /* internals of backtrace setup */
+/* mc_diff - Memory snapshooting and comparison                             */
+
+#include "src/xbt/ex_interface.h"   /* internals of backtrace setup */
 #include "xbt/str.h"
 #include "mc/mc.h"
 #include "xbt/mmalloc.h"
-#include "mc_object_info.h"
+#include "src/mc/mc_object_info.h"
 #include "mc/datatypes.h"
-#include "mc/mc_private.h"
-#include "mc/mc_snapshot.h"
+#include "src/mc/mc_private.h"
+#include "src/mc/mc_snapshot.h"
+#include "src/mc/mc_dwarf.hpp"
+#include "src/mc/Type.hpp"
+
+using simgrid::mc::remote;
 
 extern "C" {
 
 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_diff, xbt,
                                 "Logging specific to mc_diff in mc");
 
-xbt_dynar_t mc_heap_comparison_ignore;
-xbt_dynar_t stacks_areas;
-
-
-
-/********************************* Backtrace ***********************************/
-/******************************************************************************/
-
-static void mmalloc_backtrace_block_display(void *heapinfo, int block)
-{
-
-  /* xbt_ex_t e; */
-
-  /* if (((malloc_info *)heapinfo)[block].busy_block.bt_size == 0) { */
-  /*   fprintf(stderr, "No backtrace available for that block, sorry.\n"); */
-  /*   return; */
-  /* } */
-
-  /* memcpy(&e.bt,&(((malloc_info *)heapinfo)[block].busy_block.bt),sizeof(void*)*XBT_BACKTRACE_SIZE); */
-  /* e.used = ((malloc_info *)heapinfo)[block].busy_block.bt_size; */
-
-  /* xbt_ex_setup_backtrace(&e); */
-  /* if (e.used == 0) { */
-  /*   fprintf(stderr, "(backtrace not set)\n"); */
-  /* } else if (e.bt_strings == NULL) { */
-  /*   fprintf(stderr, "(backtrace not ready to be computed. %s)\n",xbt_binary_name?"Dunno why":"xbt_binary_name not setup yet"); */
-  /* } else { */
-  /*   int i; */
-
-  /*   fprintf(stderr, "Backtrace of where the block %d was malloced (%d frames):\n", block ,e.used); */
-  /*   for (i = 0; i < e.used; i++)       /\* no need to display "xbt_backtrace_display" *\/{ */
-  /*     fprintf(stderr, "%d ---> %s\n",i, e.bt_strings[i] + 4); */
-  /*   } */
-  /* } */
-}
-
-static void mmalloc_backtrace_fragment_display(void *heapinfo, int block,
-                                               int frag)
-{
-
-  /* xbt_ex_t e; */
-
-  /* memcpy(&e.bt,&(((malloc_info *)heapinfo)[block].busy_frag.bt[frag]),sizeof(void*)*XBT_BACKTRACE_SIZE); */
-  /* e.used = XBT_BACKTRACE_SIZE; */
-
-  /* xbt_ex_setup_backtrace(&e); */
-  /* if (e.used == 0) { */
-  /*   fprintf(stderr, "(backtrace not set)\n"); */
-  /* } else if (e.bt_strings == NULL) { */
-  /*   fprintf(stderr, "(backtrace not ready to be computed. %s)\n",xbt_binary_name?"Dunno why":"xbt_binary_name not setup yet"); */
-  /* } else { */
-  /*   int i; */
-
-  /*   fprintf(stderr, "Backtrace of where the fragment %d in block %d was malloced (%d frames):\n", frag, block ,e.used); */
-  /*   for (i = 0; i < e.used; i++)       /\* no need to display "xbt_backtrace_display" *\/{ */
-  /*     fprintf(stderr, "%d ---> %s\n",i, e.bt_strings[i] + 4); */
-  /*   } */
-  /* } */
-
-}
-
-static void mmalloc_backtrace_display(void *addr)
-{
-
-  /* size_t block, frag_nb; */
-  /* int type; */
-
-  /* xbt_mheap_t heap = __mmalloc_current_heap ?: (xbt_mheap_t) mmalloc_preinit(); */
-
-  /* block = (((char*) (addr) - (char*) heap -> heapbase) / BLOCKSIZE + 1); */
-
-  /* type = heap->heapinfo[block].type; */
-
-  /* switch(type){ */
-  /* case MMALLOC_TYPE_HEAPINFO :  */
-  /* case MMALLOC_TYPE_FREE : /\* Free block *\/ */
-  /*   fprintf(stderr, "Asked to display the backtrace of a block that is free. I'm puzzled\n"); */
-  /*   xbt_abort(); */
-  /*   break;  */
-  /* case 0: /\* Large block *\/ */
-  /*   mmalloc_backtrace_block_display(heap->heapinfo, block); */
-  /*   break; */
-  /* default: /\* Fragmented block *\/ */
-  /*   frag_nb = RESIDUAL(addr, BLOCKSIZE) >> type; */
-  /*   if(heap->heapinfo[block].busy_frag.frag_size[frag_nb] == -1){ */
-  /*     fprintf(stderr , "Asked to display the backtrace of a fragment that is free. I'm puzzled\n"); */
-  /*     xbt_abort(); */
-  /*   } */
-  /*   mmalloc_backtrace_fragment_display(heap->heapinfo, block, frag_nb); */
-  /*   break; */
-  /* } */
-}
-
-
-static int compare_backtrace(int b1, int f1, int b2, int f2)
-{
-  /*int i = 0;
-     if(f1 != -1){
-     for(i=0; i< XBT_BACKTRACE_SIZE; i++){
-     if(heapinfo1[b1].busy_frag.bt[f1][i] != heapinfo2[b2].busy_frag.bt[f2][i]){
-     //mmalloc_backtrace_fragment_display((void*)heapinfo1, b1, f1);
-     //mmalloc_backtrace_fragment_display((void*)heapinfo2, b2, f2);
-     return 1;
-     }
-     }
-     }else{
-     for(i=0; i< heapinfo1[b1].busy_block.bt_size; i++){
-     if(heapinfo1[b1].busy_block.bt[i] != heapinfo2[b2].busy_block.bt[i]){
-     //mmalloc_backtrace_block_display((void*)heapinfo1, b1);
-     //mmalloc_backtrace_block_display((void*)heapinfo2, b2);
-     return 1;
-     }
-     }
-     } */
-  return 0;
-}
-
-
 /*********************************** Heap comparison ***********************************/
 /***************************************************************************************/
 
 typedef char *type_name;
 
-struct s_mc_diff {
+struct XBT_PRIVATE s_mc_diff {
   s_xbt_mheap_t std_heap_copy;
-  size_t heaplimit;
+  std::size_t heaplimit;
   // Number of blocks in the heaps:
-  size_t heapsize1, heapsize2;
-  xbt_dynar_t to_ignore1, to_ignore2;
+  std::size_t heapsize1, heapsize2;
+  std::vector<simgrid::mc::IgnoredHeapRegion>* to_ignore1;
+  std::vector<simgrid::mc::IgnoredHeapRegion>* to_ignore2;
   s_heap_area_t *equals_to1, *equals_to2;
-  dw_type_t *types1, *types2;
-  size_t available;
+  simgrid::mc::Type **types1;
+  simgrid::mc::Type **types2;
+  std::size_t available;
 };
 
 #define equals_to1_(i,j) equals_to1[ MAX_FRAGMENT_PER_BLOCK*(i) + (j)]
@@ -159,7 +47,7 @@ struct s_mc_diff {
 #define types1_(i,j) types1[ MAX_FRAGMENT_PER_BLOCK*(i) + (j)]
 #define types2_(i,j) types2[ MAX_FRAGMENT_PER_BLOCK*(i) + (j)]
 
-__thread struct s_mc_diff *mc_diff_info = NULL;
+static __thread struct s_mc_diff *mc_diff_info = nullptr;
 
 /*********************************** Free functions ************************************/
 
@@ -229,56 +117,42 @@ static int add_heap_area_pair(xbt_dynar_t list, int block1, int fragment1,
   return 0;
 }
 
-static ssize_t heap_comparison_ignore_size(xbt_dynar_t ignore_list,
-                                           const void *address)
+static ssize_t heap_comparison_ignore_size(
+  std::vector<simgrid::mc::IgnoredHeapRegion>* ignore_list,
+  const void *address)
 {
-
-  unsigned int cursor = 0;
   int start = 0;
-  int end = xbt_dynar_length(ignore_list) - 1;
-  mc_heap_ignore_region_t region;
+  int end = ignore_list->size() - 1;
 
   while (start <= end) {
-    cursor = (start + end) / 2;
-    region =
-        (mc_heap_ignore_region_t) xbt_dynar_get_as(ignore_list, cursor,
-                                                   mc_heap_ignore_region_t);
-    if (region->address == address)
-      return region->size;
-    if (region->address < address)
+    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)
+    if (region.address > address)
       end = cursor - 1;
   }
 
   return -1;
 }
 
-static int is_stack(const void *address)
+static bool is_stack(const void *address)
 {
-  unsigned int cursor = 0;
-  stack_region_t stack;
-
-  xbt_dynar_foreach(stacks_areas, cursor, stack) {
-    if (address == stack->address)
-      return 1;
-  }
-
-  return 0;
+  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 int is_block_stack(int block)
+static bool is_block_stack(int block)
 {
-  unsigned int cursor = 0;
-  stack_region_t stack;
-
-  xbt_dynar_foreach(stacks_areas, cursor, stack) {
-    if (block == stack->block)
-      return 1;
-  }
-
-  return 0;
+  for (auto const& stack : mc_model_checker->process().stack_areas())
+    if (block == stack.block)
+      return true;
+  return false;
 }
 
 static void match_equals(struct s_mc_diff *state, xbt_dynar_t list)
@@ -347,8 +221,11 @@ static int equal_fragments(struct s_mc_diff *state, int b1, int f1, int b2,
   return 0;
 }
 
-int init_heap_information(xbt_mheap_t heap1, xbt_mheap_t heap2, xbt_dynar_t i1,
-                          xbt_dynar_t i2)
+}
+
+int init_heap_information(xbt_mheap_t heap1, xbt_mheap_t heap2,
+                          std::vector<simgrid::mc::IgnoredHeapRegion>* i1,
+                          std::vector<simgrid::mc::IgnoredHeapRegion>* i2)
 {
   if (mc_diff_info == NULL) {
     mc_diff_info = xbt_new0(struct s_mc_diff, 1);
@@ -368,7 +245,7 @@ int init_heap_information(xbt_mheap_t heap1, xbt_mheap_t heap2, xbt_dynar_t i1,
 
   state->heaplimit = ((struct mdesc *) heap1)->heaplimit;
   
-  state->std_heap_copy = *MC_process_get_heap(&mc_model_checker->process());
+  state->std_heap_copy = *mc_model_checker->process().get_heap();
 
   state->heapsize1 = heap1->heapsize;
   state->heapsize2 = heap2->heapsize;
@@ -381,18 +258,18 @@ int init_heap_information(xbt_mheap_t heap1, xbt_mheap_t heap2, xbt_dynar_t i1,
         realloc(state->equals_to1,
                 state->heaplimit * MAX_FRAGMENT_PER_BLOCK *
                 sizeof(s_heap_area_t));
-    state->types1 = (s_dw_type**)
+    state->types1 = (simgrid::mc::Type**)
         realloc(state->types1,
                 state->heaplimit * MAX_FRAGMENT_PER_BLOCK *
-                sizeof(type_name *));
+                sizeof(simgrid::mc::Type*));
     state->equals_to2 = (s_heap_area_t*)
         realloc(state->equals_to2,
                 state->heaplimit * MAX_FRAGMENT_PER_BLOCK *
                 sizeof(s_heap_area_t));
-    state->types2 = (s_dw_type**)
+    state->types2 = (simgrid::mc::Type**)
         realloc(state->types2,
                 state->heaplimit * MAX_FRAGMENT_PER_BLOCK *
-                sizeof(type_name *));
+                sizeof(simgrid::mc::Type*));
     state->available = state->heaplimit;
   }
 
@@ -409,6 +286,8 @@ int init_heap_information(xbt_mheap_t heap1, xbt_mheap_t heap2, xbt_dynar_t i1,
 
 }
 
+extern "C" {
+
 void reset_heap_information()
 {
 
@@ -418,10 +297,10 @@ void reset_heap_information()
 static inline
 mc_mem_region_t MC_get_heap_region(mc_snapshot_t snapshot)
 {
-  size_t n = snapshot->snapshot_regions_count;
+  size_t n = snapshot->snapshot_regions.size();
   for (size_t i=0; i!=n; ++i) {
-    mc_mem_region_t region = snapshot->snapshot_regions[i];
-    if (region->region_type == MC_REGION_TYPE_HEAP)
+    mc_mem_region_t region = snapshot->snapshot_regions[i].get();
+    if (region->region_type() == simgrid::mc::RegionType::Heap)
       return region;
   }
   xbt_die("No heap region");
@@ -429,7 +308,7 @@ mc_mem_region_t MC_get_heap_region(mc_snapshot_t snapshot)
 
 int mmalloc_compare_heap(mc_snapshot_t snapshot1, mc_snapshot_t snapshot2)
 {
-  mc_process_t process = &mc_model_checker->process();
+  simgrid::mc::Process* process = &mc_model_checker->process();
   struct s_mc_diff *state = mc_diff_info;
 
   /* Start comparison */
@@ -453,10 +332,12 @@ int mmalloc_compare_heap(mc_snapshot_t snapshot1, mc_snapshot_t snapshot2)
   void* heapinfo_address = &((xbt_mheap_t) process->heap_address)->heapinfo;
 
   // This is in snapshot do not use them directly:
-  const malloc_info* heapinfos1 = (const malloc_info*) MC_snapshot_read_pointer(snapshot1, heapinfo_address, MC_PROCESS_INDEX_MISSING);
-  const malloc_info* heapinfos2 = (const malloc_info*) MC_snapshot_read_pointer(snapshot2, heapinfo_address, MC_PROCESS_INDEX_MISSING);
+  const malloc_info* heapinfos1 = snapshot1->read<malloc_info*>(
+    (std::uint64_t)heapinfo_address, simgrid::mc::ProcessIndexMissing);
+  const malloc_info* heapinfos2 = snapshot2->read<malloc_info*>(
+    (std::uint64_t)heapinfo_address, simgrid::mc::ProcessIndexMissing);
 
-  while (i1 <= state->heaplimit) {
+  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));
@@ -504,7 +385,7 @@ int mmalloc_compare_heap(mc_snapshot_t snapshot1, mc_snapshot_t snapshot2)
                          (char *) state->std_heap_copy.heapbase;
 
           res_compare =
-              compare_heap_area(MC_PROCESS_INDEX_MISSING, addr_block1, addr_block2, snapshot1, snapshot2,
+              compare_heap_area(simgrid::mc::ProcessIndexMissing, addr_block1, addr_block2, snapshot1, snapshot2,
                                 NULL, NULL, 0);
 
           if (res_compare != 1) {
@@ -520,7 +401,7 @@ int mmalloc_compare_heap(mc_snapshot_t snapshot1, mc_snapshot_t snapshot2)
 
       }
 
-      while (i2 <= state->heaplimit && !equal) {
+      while (i2 < state->heaplimit && !equal) {
 
         addr_block2 = (ADDR2UINT(i2) - 1) * BLOCKSIZE +
                        (char *) state->std_heap_copy.heapbase;
@@ -543,7 +424,7 @@ int mmalloc_compare_heap(mc_snapshot_t snapshot1, mc_snapshot_t snapshot2)
         }
 
         res_compare =
-            compare_heap_area(MC_PROCESS_INDEX_MISSING, addr_block1, addr_block2, snapshot1, snapshot2,
+            compare_heap_area(simgrid::mc::ProcessIndexMissing, addr_block1, addr_block2, snapshot1, snapshot2,
                               NULL, NULL, 0);
 
         if (res_compare != 1) {
@@ -595,7 +476,7 @@ int mmalloc_compare_heap(mc_snapshot_t snapshot1, mc_snapshot_t snapshot2)
                           (j1 << heapinfo2->type));
 
             res_compare =
-                compare_heap_area(MC_PROCESS_INDEX_MISSING, addr_frag1, addr_frag2, snapshot1, snapshot2,
+                compare_heap_area(simgrid::mc::ProcessIndexMissing, addr_frag1, addr_frag2, snapshot1, snapshot2,
                                   NULL, NULL, 0);
 
             if (res_compare != 1)
@@ -605,7 +486,7 @@ int mmalloc_compare_heap(mc_snapshot_t snapshot1, mc_snapshot_t snapshot2)
 
         }
 
-        while (i2 <= state->heaplimit && !equal) {
+        while (i2 < state->heaplimit && !equal) {
 
           const malloc_info* heapinfo2b = (const malloc_info*) MC_region_read(
             heap_region2, &heapinfo_temp2b, &heapinfos2[i2],
@@ -643,7 +524,7 @@ int mmalloc_compare_heap(mc_snapshot_t snapshot1, mc_snapshot_t snapshot2)
                           (j2 << heapinfo2b->type));
 
             res_compare =
-                compare_heap_area(MC_PROCESS_INDEX_MISSING, addr_frag1, addr_frag2, snapshot2, snapshot2,
+                compare_heap_area(simgrid::mc::ProcessIndexMissing, addr_frag1, addr_frag2, snapshot2, snapshot2,
                                   NULL, NULL, 0);
 
             if (res_compare != 1) {
@@ -679,7 +560,7 @@ int mmalloc_compare_heap(mc_snapshot_t snapshot1, mc_snapshot_t snapshot2)
   /* All blocks/fragments are equal to another block/fragment ? */
   size_t i = 1, j = 0;
 
-  for(i = 1; i <= state->heaplimit; i++) {
+  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) {
@@ -721,7 +602,7 @@ int mmalloc_compare_heap(mc_snapshot_t snapshot1, mc_snapshot_t snapshot2)
   if (i1 == state->heaplimit)
     XBT_DEBUG("Number of blocks/fragments not found in heap1 : %d", nb_diff1);
 
-  for (i=1; i <= state->heaplimit; i++) {
+  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) {
@@ -784,7 +665,7 @@ static int compare_heap_area_without_type(struct s_mc_diff *state, int process_i
                                           xbt_dynar_t previous, int size,
                                           int check_ignore)
 {
-  mc_process_t process = &mc_model_checker->process();
+  simgrid::mc::Process* process = &mc_model_checker->process();
 
   int i = 0;
   const void *addr_pointed1, *addr_pointed2;
@@ -818,13 +699,13 @@ static int compare_heap_area_without_type(struct s_mc_diff *state, int process_i
     if (MC_snapshot_region_memcmp(((char *) real_area1) + i, heap_region1, ((char *) real_area2) + i, heap_region2, 1) != 0) {
 
       pointer_align = (i / sizeof(void *)) * sizeof(void *);
-      addr_pointed1 = MC_snapshot_read_pointer(snapshot1, (char *) real_area1 + pointer_align, process_index);
-      addr_pointed2 = MC_snapshot_read_pointer(snapshot2, (char *) real_area2 + pointer_align, process_index);
+      addr_pointed1 = snapshot1->read(
+        remote((void**)((char *) real_area1 + pointer_align)), process_index);
+      addr_pointed2 = snapshot2->read(
+        remote((void**)((char *) real_area2 + pointer_align)), process_index);
 
-      if (addr_pointed1 > process->maestro_stack_start
-          && addr_pointed1 < process->maestro_stack_end
-          && addr_pointed2 > process->maestro_stack_start
-          && addr_pointed2 < process->maestro_stack_end) {
+      if (process->in_maestro_stack(remote(addr_pointed1))
+        && process->in_maestro_stack(remote(addr_pointed2))) {
         i = pointer_align + sizeof(void *);
         continue;
       } else if (addr_pointed1 > state->std_heap_copy.heapbase
@@ -872,14 +753,18 @@ static int compare_heap_area_with_type(struct s_mc_diff *state, int process_inde
                                        const void *real_area1, const void *real_area2,
                                        mc_snapshot_t snapshot1,
                                        mc_snapshot_t snapshot2,
-                                       xbt_dynar_t previous, dw_type_t type,
+                                       xbt_dynar_t previous, simgrid::mc::Type* type,
                                        int area_size, int check_ignore,
                                        int pointer_level)
 {
 top:
-  if (is_stack(real_area1) && is_stack(real_area2))
+  // HACK: This should not happen but in pratice, there is some
+  // DW_TAG_typedef without DW_AT_type. We should fix this somehow.
+  if (type == nullptr)
     return 0;
 
+  if (is_stack(real_area1) && is_stack(real_area2))
+    return 0;
   ssize_t ignore1, ignore2;
 
   if ((check_ignore > 0)
@@ -890,11 +775,9 @@ top:
     return 0;
   }
 
-  dw_type_t subtype, subsubtype;
+  simgrid::mc::Type *subtype, *subsubtype;
   int res, elm_size;
-  unsigned int cursor = 0;
-  dw_type_t member;
-  const void *addr_pointed1, *addr_pointed2;;
+  const void *addr_pointed1, *addr_pointed2;
 
   mc_mem_region_t heap_region1 = MC_get_heap_region(snapshot1);
   mc_mem_region_t heap_region2 = MC_get_heap_region(snapshot2);
@@ -904,7 +787,7 @@ top:
     return 1;
 
   case DW_TAG_base_type:
-    if (type->name != NULL && strcmp(type->name, "char") == 0) {        /* String, hence random (arbitrary ?) size */
+    if (!type->name.empty() && type->name == "char") {        /* String, hence random (arbitrary ?) size */
       if (real_area1 == real_area2)
         return -1;
       else
@@ -978,15 +861,19 @@ top:
   case DW_TAG_rvalue_reference_type:
   case DW_TAG_pointer_type:
     if (type->subtype && type->subtype->type == DW_TAG_subroutine_type) {
-      addr_pointed1 = MC_snapshot_read_pointer(snapshot1, real_area1, process_index);
-      addr_pointed2 = MC_snapshot_read_pointer(snapshot2, real_area2, process_index);
+      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);;
     } else {
       pointer_level++;
       if (pointer_level > 1) {  /* Array of pointers */
         for (size_t i = 0; i < (area_size / sizeof(void *)); i++) {
-          addr_pointed1 = MC_snapshot_read_pointer(snapshot1, (char*) real_area1 + i * sizeof(void *), process_index);
-          addr_pointed2 = MC_snapshot_read_pointer(snapshot2, (char*) real_area2 + i * sizeof(void *), process_index);
+          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
@@ -1001,8 +888,8 @@ top:
             return res;
         }
       } else {
-        addr_pointed1 = MC_snapshot_read_pointer(snapshot1, real_area1, process_index);
-        addr_pointed2 = MC_snapshot_read_pointer(snapshot2, real_area2, process_index);
+        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
@@ -1035,17 +922,16 @@ top:
         return -1;
       }
     } else {
-      cursor = 0;
-      xbt_dynar_foreach(type->members, cursor, member) {
+      for(simgrid::mc::Member& member : type->members) {
         // TODO, optimize this? (for the offset case)
-        void *real_member1 =
-            mc_member_resolve(real_area1, type, member, (mc_address_space_t) snapshot1, process_index);
-        void *real_member2 =
-            mc_member_resolve(real_area2, type, member, (mc_address_space_t) snapshot2, process_index);
+        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);
         res =
-            compare_heap_area_with_type(state, process_index, real_member1, real_member2,
+          compare_heap_area_with_type(state, process_index, real_member1, real_member2,
                                         snapshot1, snapshot2,
-                                        previous, member->subtype, -1,
+                                        previous, member.type, -1,
                                         check_ignore, 0);
         if (res == 1) {
           return res;
@@ -1076,7 +962,7 @@ top:
  * @param  area_size
  * @return                    DWARF type ID for given offset
  */
-static dw_type_t get_offset_type(void *real_base_address, dw_type_t type,
+static simgrid::mc::Type* get_offset_type(void *real_base_address, simgrid::mc::Type* type,
                                  int offset, int area_size,
                                  mc_snapshot_t snapshot, int process_index)
 {
@@ -1097,20 +983,17 @@ static dw_type_t get_offset_type(void *real_base_address, dw_type_t type,
       else
         return NULL;
     } else {
-      unsigned int cursor = 0;
-      dw_type_t member;
-      xbt_dynar_foreach(type->members, cursor, member) {
+      for(simgrid::mc::Member& member : type->members) {
 
-        if (!member->location.size) {
+        if (member.has_offset_location()) {
           // We have the offset, use it directly (shortcut):
-          if (member->offset == offset)
-            return member->subtype;
+          if (member.offset() == offset)
+            return member.type;
         } else {
-          void *real_member =
-            mc_member_resolve(real_base_address, type, member,
-              (mc_address_space_t) snapshot, process_index);
+          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->subtype;
+            return member.type;
         }
 
       }
@@ -1137,9 +1020,9 @@ static dw_type_t get_offset_type(void *real_base_address, dw_type_t type,
  */
 int compare_heap_area(int process_index, const void *area1, const void *area2, mc_snapshot_t snapshot1,
                       mc_snapshot_t snapshot2, xbt_dynar_t previous,
-                      dw_type_t type, int pointer_level)
+                      simgrid::mc::Type* type, int pointer_level)
 {
-  mc_process_t process = &mc_model_checker->process();
+  simgrid::mc::Process* process = &mc_model_checker->process();
 
   struct s_mc_diff *state = mc_diff_info;
 
@@ -1152,17 +1035,17 @@ int compare_heap_area(int process_index, const void *area1, const void *area2, m
   int type_size = -1;
   int offset1 = 0, offset2 = 0;
   int new_size1 = -1, new_size2 = -1;
-  dw_type_t new_type1 = NULL, new_type2 = NULL;
+  simgrid::mc::Type *new_type1 = NULL, *new_type2 = NULL;
 
   int match_pairs = 0;
 
   // 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 = (const malloc_info*) MC_snapshot_read_pointer(
-    snapshot1, heapinfo_address, process_index);
-  const malloc_info* heapinfos2 = (const malloc_info*) MC_snapshot_read_pointer(
-    snapshot2, heapinfo_address, process_index);
+  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, heapinfo_temp2;
 
@@ -1216,8 +1099,8 @@ int compare_heap_area(int process_index, const void *area1, const void *area2, m
 
     // Find type_size:
     if ((type->type == DW_TAG_pointer_type)
-        || ((type->type == DW_TAG_base_type) && type->name != NULL
-            && (!strcmp(type->name, "char"))))
+        || ((type->type == DW_TAG_base_type) && !type->name.empty()
+            && type->name == "char"))
       type_size = -1;
     else
       type_size = type->byte_size;
@@ -1265,7 +1148,7 @@ int compare_heap_area(int process_index, const void *area1, const void *area2, m
     if (type_size != -1) {
       if (type_size != (ssize_t) heapinfo1->busy_block.busy_size
           && type_size != (ssize_t)   heapinfo2->busy_block.busy_size
-          && (type->name == NULL || !strcmp(type->name, "struct s_smx_context"))) {
+          && (type->name.empty() || type->name == "struct s_smx_context")) {
         if (match_pairs) {
           match_equals(state, previous);
           xbt_dynar_free(&previous);
@@ -1566,27 +1449,6 @@ static int get_pointed_area_size(void *area, int heap)
   }
 }
 
-// Not used:
-char *get_type_description(mc_object_info_t info, char *type_name)
-{
-
-  xbt_dict_cursor_t dict_cursor;
-  char *type_origin;
-  dw_type_t type;
-
-  xbt_dict_foreach(info->types, dict_cursor, type_origin, type) {
-    if (type->name && (strcmp(type->name, type_name) == 0)
-        && type->byte_size > 0) {
-      xbt_dict_cursor_free(&dict_cursor);
-      return type_origin;
-    }
-  }
-
-  xbt_dict_cursor_free(&dict_cursor);
-  return NULL;
-}
-
-
 #ifndef max
 #define max( a, b ) ( ((a) > (b)) ? (a) : (b) )
 #endif
@@ -1610,7 +1472,7 @@ int mmalloc_linear_compare_heap(xbt_mheap_t heap1, xbt_mheap_t heap2)
   /* Heap information */
   state->heaplimit = ((struct mdesc *) heap1)->heaplimit;
 
-  state->std_heap_copy = *MC_process_get_heap(&mc_model_checker->process());
+  state->std_heap_copy = *mc_model_checker->process().get_heap();
 
   state->heapbase1 = (char *) heap1 + BLOCKSIZE;
   state->heapbase2 = (char *) heap2 + BLOCKSIZE;