X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/1b4e20873a7bd405842f3d8d1e6dd1d518db5535..49e85177c669d793e84242983a1b1f430e47184e:/src/mc/mc_dwarf.c

diff --git a/src/mc/mc_dwarf.c b/src/mc/mc_dwarf.c
index a6124c9ba2..aa5f9f0f4e 100644
--- a/src/mc/mc_dwarf.c
+++ b/src/mc/mc_dwarf.c
@@ -1,6 +1,5 @@
 /* Copyright (c) 2008-2013. 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. */
 
@@ -51,11 +50,11 @@ static uint64_t MC_dwarf_array_element_count(Dwarf_Die* die, Dwarf_Die* unit);
  *  \param unit the DIE of the compile unit of the current DIE
  *  \param frame containg frame if any
  */
-static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame);
+static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace);
 
 /** \brief Process a type DIE
  */
-static void MC_dwarf_handle_type_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit);
+static void MC_dwarf_handle_type_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace);
 
 /** \brief Calls MC_dwarf_handle_die on all childrend of the given die
  *
@@ -64,7 +63,7 @@ static void MC_dwarf_handle_type_die(mc_object_info_t info, Dwarf_Die* die, Dwar
  *  \param unit the DIE of the compile unit of the current DIE
  *  \param frame containg frame if any
  */
-static void MC_dwarf_handle_children(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame);
+static void MC_dwarf_handle_children(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace);
 
 /** \brief Handle a variable (DW_TAG_variable or other)
  *
@@ -73,7 +72,7 @@ static void MC_dwarf_handle_children(mc_object_info_t info, Dwarf_Die* die, Dwar
  *  \param unit the DIE of the compile unit of the current DIE
  *  \param frame containg frame if any
  */
-static void MC_dwarf_handle_variable_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame);
+static void MC_dwarf_handle_variable_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace);
 
 /** \brief Convert a libdw DWARF expression into a MC representation of the location
  *
@@ -99,7 +98,7 @@ const char* MC_dwarf_attrname(int attr) {
   switch (attr) {
 #include "mc_dwarf_attrnames.h"
   default:
-    return "DW_AT_unkown";
+    return "DW_AT_unknown";
   }
 }
 
@@ -114,7 +113,119 @@ const char* MC_dwarf_tagname(int tag) {
   case DW_TAG_invalid:
     return "DW_TAG_invalid";
   default:
-    return "DW_TAG_unkown";
+    return "DW_TAG_unknown";
+  }
+}
+
+/** \brief A class of DWARF tags (DW_TAG_*)
+ */
+typedef enum mc_tag_class {
+  mc_tag_unknown,
+  mc_tag_type,
+  mc_tag_subprogram,
+  mc_tag_variable,
+  mc_tag_scope,
+  mc_tag_namespace
+} mc_tag_class;
+
+static mc_tag_class MC_dwarf_tag_classify(int tag) {
+  switch (tag) {
+
+    case DW_TAG_array_type:
+    case DW_TAG_class_type:
+    case DW_TAG_enumeration_type:
+    case DW_TAG_typedef:
+    case DW_TAG_pointer_type:
+    case DW_TAG_reference_type:
+    case DW_TAG_rvalue_reference_type:
+    case DW_TAG_string_type:
+    case DW_TAG_structure_type:
+    case DW_TAG_subroutine_type:
+    case DW_TAG_union_type:
+    case DW_TAG_ptr_to_member_type:
+    case DW_TAG_set_type:
+    case DW_TAG_subrange_type:
+    case DW_TAG_base_type:
+    case DW_TAG_const_type:
+    case DW_TAG_file_type:
+    case DW_TAG_packed_type:
+    case DW_TAG_volatile_type:
+    case DW_TAG_restrict_type:
+    case DW_TAG_interface_type:
+    case DW_TAG_unspecified_type:
+    case DW_TAG_mutable_type:
+    case DW_TAG_shared_type:
+      return mc_tag_type;
+
+    case DW_TAG_subprogram:
+      return mc_tag_subprogram;
+
+    case DW_TAG_variable:
+    case DW_TAG_formal_parameter:
+      return mc_tag_variable;
+
+    case DW_TAG_lexical_block:
+    case DW_TAG_try_block:
+    case DW_TAG_inlined_subroutine:
+      return mc_tag_scope;
+
+    case DW_TAG_namespace:
+      return mc_tag_namespace;
+
+    default:
+      return mc_tag_unknown;
+
+  }
+}
+
+#define MC_DW_CLASS_UNKNOWN 0
+#define MC_DW_CLASS_ADDRESS 1   // Location in the address space of the program
+#define MC_DW_CLASS_BLOCK 2     // Arbitrary block of bytes
+#define MC_DW_CLASS_CONSTANT 3
+#define MC_DW_CLASS_STRING 3    // String
+#define MC_DW_CLASS_FLAG 4      // Boolean
+#define MC_DW_CLASS_REFERENCE 5 // Reference to another DIE
+#define MC_DW_CLASS_EXPRLOC 6   // DWARF expression/location description
+#define MC_DW_CLASS_LINEPTR 7
+#define MC_DW_CLASS_LOCLISTPTR 8
+#define MC_DW_CLASS_MACPTR 9
+#define MC_DW_CLASS_RANGELISTPTR 10
+
+static int MC_dwarf_form_get_class(int form) {
+  switch(form) {
+  case DW_FORM_addr:
+    return MC_DW_CLASS_ADDRESS;
+  case DW_FORM_block2:
+  case DW_FORM_block4:
+  case DW_FORM_block:
+  case DW_FORM_block1:
+    return MC_DW_CLASS_BLOCK;
+  case DW_FORM_data1:
+  case DW_FORM_data2:
+  case DW_FORM_data4:
+  case DW_FORM_data8:
+  case DW_FORM_udata:
+  case DW_FORM_sdata:
+    return MC_DW_CLASS_CONSTANT;
+  case DW_FORM_string:
+  case DW_FORM_strp:
+    return MC_DW_CLASS_STRING;
+  case DW_FORM_ref_addr:
+  case DW_FORM_ref1:
+  case DW_FORM_ref2:
+  case DW_FORM_ref4:
+  case DW_FORM_ref8:
+  case DW_FORM_ref_udata:
+    return MC_DW_CLASS_REFERENCE;
+  case DW_FORM_flag:
+  case DW_FORM_flag_present:
+    return MC_DW_CLASS_FLAG;
+  case DW_FORM_exprloc:
+    return MC_DW_CLASS_EXPRLOC;
+  // TODO sec offset
+  // TODO indirect
+  default:
+    return MC_DW_CLASS_UNKNOWN;
   }
 }
 
@@ -165,7 +276,7 @@ static const char* MC_dwarf_at_linkage_name(Dwarf_Die* die) {
  *  \return MC specific representation of the location list represented by the given attribute
  *  of the given die
  */
-static dw_location_t MC_dwarf_get_location_list(Dwarf_Die* die, Dwarf_Attribute* attr) {
+static dw_location_t MC_dwarf_get_location_list(mc_object_info_t info, Dwarf_Die* die, Dwarf_Attribute* attr) {
 
   dw_location_t location = xbt_new0(s_dw_location_t, 1);
   location->type = e_dw_loclist;
@@ -186,8 +297,11 @@ static dw_location_t MC_dwarf_get_location_list(Dwarf_Die* die, Dwarf_Attribute*
       xbt_die("Error while loading location list");
 
     dw_location_entry_t new_entry = xbt_new0(s_dw_location_entry_t, 1);
-    new_entry->lowpc = start;
-    new_entry->highpc = end;
+
+    void* base = info->flags & MC_OBJECT_INFO_EXECUTABLE ? 0 : MC_object_base_address(info);
+
+    new_entry->lowpc = (char*) base + start;
+    new_entry->highpc = (char*) base + end;
     new_entry->location = MC_dwarf_get_expression(expr, len);
 
     xbt_dynar_push(loclist, &new_entry);
@@ -195,6 +309,31 @@ static dw_location_t MC_dwarf_get_location_list(Dwarf_Die* die, Dwarf_Attribute*
   }
 }
 
+/** \brief Find the frame base of a given frame
+ *
+ *  \param ip         Instruction pointer
+ *  \param frame
+ *  \param unw_cursor
+ */
+void* mc_find_frame_base(void* ip, dw_frame_t frame, unw_cursor_t* unw_cursor) {
+  switch(frame->frame_base->type) {
+  case e_dw_loclist:
+  {
+    int loclist_cursor;
+    for(loclist_cursor=0; loclist_cursor < xbt_dynar_length(frame->frame_base->location.loclist); loclist_cursor++){
+      dw_location_entry_t entry = xbt_dynar_get_as(frame->frame_base->location.loclist, loclist_cursor, dw_location_entry_t);
+      if((ip >= entry->lowpc) && (ip < entry->highpc)){
+        return (void*) MC_dwarf_resolve_location(unw_cursor, entry->location, NULL);
+      }
+    }
+    return NULL;
+  }
+  // Not handled:
+  default:
+    return NULL;
+  }
+}
+
 /** \brief Get the location expression or location list from an attribute
  *
  *  Processes direct expressions as well as location lists.
@@ -204,7 +343,7 @@ static dw_location_t MC_dwarf_get_location_list(Dwarf_Die* die, Dwarf_Attribute*
  *  \return MC specific representation of the location represented by the given attribute
  *  of the given die
  */
-static dw_location_t MC_dwarf_get_location(Dwarf_Die* die, Dwarf_Attribute* attr) {
+static dw_location_t MC_dwarf_get_location(mc_object_info_t info, Dwarf_Die* die, Dwarf_Attribute* attr) {
   int form = dwarf_whatform(attr);
   switch (form) {
 
@@ -224,11 +363,12 @@ static dw_location_t MC_dwarf_get_location(Dwarf_Die* die, Dwarf_Attribute* attr
 
   // The attribute is a reference to a location list entry:
   case DW_FORM_sec_offset:
+  case DW_FORM_data1:
   case DW_FORM_data2:
   case DW_FORM_data4:
   case DW_FORM_data8:
     {
-      return MC_dwarf_get_location_list(die, attr);
+      return MC_dwarf_get_location_list(info, die, attr);
     }
     break;
 
@@ -251,13 +391,13 @@ static dw_location_t MC_dwarf_get_location(Dwarf_Die* die, Dwarf_Attribute* attr
  *  \return MC specific representation of the location represented by the given attribute
  *  of the given die
  */
-static dw_location_t MC_dwarf_at_location(Dwarf_Die* die, int attribute) {
+static dw_location_t MC_dwarf_at_location(mc_object_info_t info, Dwarf_Die* die, int attribute) {
   if(!dwarf_hasattr_integrate(die, attribute))
     return xbt_new0(s_dw_location_t, 1);
 
   Dwarf_Attribute attr;
   dwarf_attr_integrate(die, attribute, &attr);
-  return MC_dwarf_get_location(die, &attr);
+  return MC_dwarf_get_location(info, die, &attr);
 }
 
 static char* MC_dwarf_at_type(Dwarf_Die* die) {
@@ -345,7 +485,7 @@ static uint64_t MC_dwarf_subrange_element_count(Dwarf_Die* die, Dwarf_Die* unit)
     return MC_dwarf_attr_uint(die, DW_AT_count, 0);
   }
 
-  // Otherwise compute DW_TAG_upper_bound-DW_TAG_lower_bound:
+  // Otherwise compute DW_TAG_upper_bound-DW_TAG_lower_bound + 1:
 
   if (!dwarf_hasattr_integrate(die, DW_AT_upper_bound)) {
 	// This is not really 0, but the code expects this (we do not know):
@@ -359,7 +499,7 @@ static uint64_t MC_dwarf_subrange_element_count(Dwarf_Die* die, Dwarf_Die* unit)
   } else {
 	lower_bound = MC_dwarf_default_lower_bound(dwarf_srclang(unit));
   }
-  return upper_bound - lower_bound;
+  return upper_bound - lower_bound + 1;
 }
 
 static uint64_t MC_dwarf_array_element_count(Dwarf_Die* die, Dwarf_Die* unit) {
@@ -389,9 +529,6 @@ Dwarf_Off MC_dwarf_resolve_location(unw_cursor_t* c, dw_location_t location, voi
     }
     dw_location_t location_entry = xbt_dynar_get_as(location->location.compose, 0, dw_location_t);
     switch (location_entry->type){
-    case e_dw_register:
-      unw_get_reg(c, location_entry->location.reg, &res);
-      return res;
     case e_dw_bregister_op:
       unw_get_reg(c, location_entry->location.breg_op.reg, &res);
       return (Dwarf_Off) ((long)res + location_entry->location.breg_op.offset);
@@ -429,9 +566,12 @@ static void MC_dwarf_fill_member_location(dw_type_t type, dw_type_t member, Dwar
 
   Dwarf_Attribute attr;
   dwarf_attr_integrate(child, DW_AT_data_member_location, &attr);
-  switch (dwarf_whatform(&attr)) {
-
-  case DW_FORM_exprloc:
+  int form = dwarf_whatform(&attr);
+  int klass = MC_dwarf_form_get_class(form);
+  switch (klass) {
+  case MC_DW_CLASS_EXPRLOC:
+  case MC_DW_CLASS_BLOCK:
+    // Location expression:
     {
       Dwarf_Op* expr;
       size_t len;
@@ -444,28 +584,34 @@ static void MC_dwarf_fill_member_location(dw_type_t type, dw_type_t member, Dwar
       if (len==1 && expr[0].atom == DW_OP_plus_uconst) {
         member->offset =  expr[0].number;
       } else {
-        xbt_die("Can't groke this location expression yet. %i %i",
-          len==1 , expr[0].atom == DW_OP_plus_uconst);
+        xbt_die("Can't groke this location expression yet.");
       }
       break;
     }
-  case DW_FORM_data1:
-  case DW_FORM_data2:
-  case DW_FORM_data4:
-  case DW_FORM_data8:
-  case DW_FORM_sdata:
-  case DW_FORM_udata:
+  case MC_DW_CLASS_CONSTANT:
+    // Offset from the base address of the object:
     {
       Dwarf_Word offset;
       if (!dwarf_formudata(&attr, &offset))
         member->offset = offset;
       else
-        xbt_die("Cannot get DW_AT_data_member_%s location <%p>%s",
+        xbt_die("Cannot get %s location <%p>%s",
           MC_dwarf_attr_string(child, DW_AT_name),
           type->id, type->name);
       break;
     }
+  case MC_DW_CLASS_LOCLISTPTR:
+    // Reference to a location list:
+    // TODO
+  case MC_DW_CLASS_REFERENCE:
+    // It's supposed to be possible in DWARF2 but I couldn't find its semantic
+    // in the spec.
+  default:
+    xbt_die(
+      "Can't handle form class (%i) / form 0x%x as DW_AT_member_location",
+      klass, form);
   }
+
 }
 
 static void MC_dwarf_add_members(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_type_t type) {
@@ -475,6 +621,15 @@ static void MC_dwarf_add_members(mc_object_info_t info, Dwarf_Die* die, Dwarf_Di
   type->members = xbt_dynar_new(sizeof(dw_type_t), (void(*)(void*))dw_type_free);
   for (res=dwarf_child(die, &child); res==0; res=dwarf_siblingof(&child,&child)) {
     if (dwarf_tag(&child)==DW_TAG_member) {
+
+      // Skip declarations:
+      if (MC_dwarf_attr_flag(&child, DW_AT_declaration, false))
+        continue;
+
+      // Skip compile time constants:
+      if(dwarf_hasattr(&child, DW_AT_const_value))
+        continue;
+
       // TODO, we should use another type (because is is not a type but a member)
       dw_type_t member = xbt_new0(s_dw_type_t, 1);
       member->type = -1;
@@ -515,7 +670,7 @@ static void MC_dwarf_add_members(mc_object_info_t info, Dwarf_Die* die, Dwarf_Di
  *  \param unit compilation unit of the current DIE
  *  \return MC representation of the type
  */
-static dw_type_t MC_dwarf_die_to_type(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit) {
+static dw_type_t MC_dwarf_die_to_type(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace) {
 
   dw_type_t type = xbt_new0(s_dw_type_t, 1);
   type->type = -1;
@@ -568,16 +723,25 @@ static dw_type_t MC_dwarf_die_to_type(mc_object_info_t info, Dwarf_Die* die, Dwa
   case DW_TAG_union_type:
   case DW_TAG_class_type:
 	  MC_dwarf_add_members(info, die, unit, type);
+	  char* new_namespace = namespace == NULL ? xbt_strdup(type->name)
+	    : bprintf("%s::%s", namespace, type->name);
+	  MC_dwarf_handle_children(info, die, unit, frame, new_namespace);
+	  free(new_namespace);
+	  break;
   }
 
   return type;
 }
 
-static void MC_dwarf_handle_type_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit) {
-  dw_type_t type = MC_dwarf_die_to_type(info, die, unit);
+static void MC_dwarf_handle_type_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace) {
+  dw_type_t type = MC_dwarf_die_to_type(info, die, unit, frame, namespace);
 
   char* key = bprintf("%" PRIx64, (uint64_t) type->id);
   xbt_dict_set(info->types, key, type, NULL);
+
+  if(type->name && type->byte_size!=0) {
+    xbt_dict_set(info->types_by_name, type->name, type, NULL);
+  }
 }
 
 /** \brief Convert libdw location expresion elment into native one (or NULL in some cases) */
@@ -739,11 +903,17 @@ static dw_location_t MC_dwarf_get_expression(Dwarf_Op* expr,  size_t len) {
   return loc;
 }
 
-static dw_variable_t MC_die_to_variable(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame) {
-  // Drop declaration:
+static int mc_anonymous_variable_index = 0;
+
+static dw_variable_t MC_die_to_variable(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace) {
+  // Skip declarations:
   if (MC_dwarf_attr_flag(die, DW_AT_declaration, false))
     return NULL;
 
+  // Skip compile time constants:
+  if(dwarf_hasattr(die, DW_AT_const_value))
+    return NULL;
+
   Dwarf_Attribute attr_location;
   if (dwarf_attr(die, DW_AT_location, &attr_location)==NULL) {
     // No location: do not add it ?
@@ -753,14 +923,18 @@ static dw_variable_t MC_die_to_variable(mc_object_info_t info, Dwarf_Die* die, D
   dw_variable_t variable = xbt_new0(s_dw_variable_t, 1);
   variable->dwarf_offset = dwarf_dieoffset(die);
   variable->global = frame == NULL; // Can be override base on DW_AT_location
-  variable->name = xbt_strdup(MC_dwarf_attr_string(die, DW_AT_name));
+
+  const char* name = MC_dwarf_attr_string(die, DW_AT_name);
+  variable->name = xbt_strdup(name);
+
   variable->type_origin = MC_dwarf_at_type(die);
-  variable->address.address = NULL;
 
-  int form;
-  switch (form = dwarf_whatform(&attr_location)) {
-  case DW_FORM_exprloc:
-  case DW_FORM_block1: // Not in the spec but found in the wild.
+  int form = dwarf_whatform(&attr_location);
+  int klass = form == DW_FORM_sec_offset ? MC_DW_CLASS_CONSTANT : MC_dwarf_form_get_class(form);
+  switch (klass) {
+  case MC_DW_CLASS_EXPRLOC:
+  case MC_DW_CLASS_BLOCK:
+    // Location expression:
     {
       Dwarf_Op* expr;
       size_t len;
@@ -774,107 +948,143 @@ static dw_variable_t MC_die_to_variable(mc_object_info_t info, Dwarf_Die* die, D
         variable->global = 1;
         Dwarf_Off offset = expr[0].number;
         // TODO, Why is this different base on the object?
-        Dwarf_Off base = strcmp(info->file_name, xbt_binary_name) !=0 ? (Dwarf_Off) info->start_text : 0;
-        variable->address.address = (void*) (base + offset);
+        Dwarf_Off base = strcmp(info->file_name, xbt_binary_name) !=0 ? (Dwarf_Off) info->start_exec : 0;
+        variable->address = (void*) (base + offset);
       } else {
-        variable->address.location = MC_dwarf_get_expression(expr, len);
+        variable->location = MC_dwarf_get_expression(expr, len);
       }
 
       break;
     }
-  case DW_FORM_sec_offset: // type loclistptr
-  case DW_FORM_data2:
-  case DW_FORM_data4:
-  case DW_FORM_data8:
-    variable->address.location = MC_dwarf_get_location_list(die, &attr_location);
+  case MC_DW_CLASS_LOCLISTPTR:
+  case MC_DW_CLASS_CONSTANT:
+    // Reference to location list:
+    variable->location = MC_dwarf_get_location_list(info, die, &attr_location);
     break;
   default:
-    xbt_die("Unexpected form %i list for location in <%p>%s",
-      form, (void*) variable->dwarf_offset, variable->name);
+    xbt_die("Unexpected form 0x%x (%i), class 0x%x (%i) list for location in <%p>%s",
+      form, form, klass, klass, (void*) variable->dwarf_offset, variable->name);
+  }
+
+  // Handle start_scope:
+  if (dwarf_hasattr(die, DW_AT_start_scope)) {
+    Dwarf_Attribute attr;
+    dwarf_attr(die, DW_AT_start_scope, &attr);
+    int form  = dwarf_whatform(&attr);
+    int klass = MC_dwarf_form_get_class(form);
+    switch(klass) {
+    case MC_DW_CLASS_CONSTANT:
+    {
+      Dwarf_Word value;
+      variable->start_scope = dwarf_formudata(&attr, &value) == 0 ? (size_t) value : 0;
+      break;
+    }
+    default:
+      xbt_die("Unhandled form 0x%x, class 0x%X for DW_AT_start_scope of variable %s",
+        form, klass, name==NULL ? "?" : name);
+    }
+  }
+
+  if(namespace && variable->global) {
+    char* old_name = variable->name;
+    variable->name = bprintf("%s::%s", namespace, old_name);
+    free(old_name);
+  }
+
+  // The current code needs a variable name,
+  // generate a fake one:
+  if(!variable->name) {
+    variable->name = bprintf("@anonymous#%i", mc_anonymous_variable_index++);
   }
 
   return variable;
 }
 
-static void MC_dwarf_handle_variable_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame) {
-  dw_variable_t variable = MC_die_to_variable(info, die, unit, frame);
+static void MC_dwarf_handle_variable_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace) {
+  dw_variable_t variable = MC_die_to_variable(info, die, unit, frame, namespace);
   if(variable==NULL)
       return;
   MC_dwarf_register_variable(info, frame, variable);
 }
 
-static void MC_dwarf_handle_subprogram_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t parent_frame) {
+static void MC_dwarf_handle_subprogram_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t parent_frame, const char* namespace) {
   dw_frame_t frame = xbt_new0(s_dw_frame_t, 1);
 
   frame->start = dwarf_dieoffset(die);
 
-  const char* name = MC_dwarf_at_linkage_name(die);
-  if (name==NULL)
-    name = MC_dwarf_attr_string(die, DW_AT_name);
-  frame->name = xbt_strdup(name);
+  const char* name = MC_dwarf_attr_string(die, DW_AT_name);
+  frame->name = namespace ? bprintf("%s::%s", namespace, name) : xbt_strdup(name);
+
+  // This is the base address for DWARF addresses.
+  // Relocated addresses are offset from this base address.
+  // See DWARF4 spec 7.5
+  void* base = info->flags & MC_OBJECT_INFO_EXECUTABLE ? 0 : MC_object_base_address(info);
 
   // Variables are filled in the (recursive) call of MC_dwarf_handle_children:
   frame->variables = xbt_dynar_new(sizeof(dw_variable_t), dw_variable_free_voidp);
-  frame->high_pc = (void*) MC_dwarf_attr_addr(die, DW_AT_high_pc);
-  frame->low_pc = (void*) MC_dwarf_attr_addr(die, DW_AT_low_pc);
-  frame->frame_base = MC_dwarf_at_location(die, DW_AT_frame_base);
+  frame->high_pc = ((char*) base) + MC_dwarf_attr_addr(die, DW_AT_high_pc);
+  frame->low_pc = ((char*) base) + MC_dwarf_attr_addr(die, DW_AT_low_pc);
+  frame->frame_base = MC_dwarf_at_location(info, die, DW_AT_frame_base);
   frame->end = -1; // This one is now useless:
 
+  // Register it:
+  xbt_dynar_push(info->subprograms, &frame);
+
   // Handle children:
-  MC_dwarf_handle_children(info, die, unit, frame);
+  MC_dwarf_handle_children(info, die, unit, frame, namespace);
+}
 
-  // Register it:
-  xbt_dict_set(info->local_variables, frame->name, frame, NULL);
+static void mc_dwarf_handle_namespace_die(
+    mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace) {
+  const char* name = MC_dwarf_attr_string(die, DW_AT_name);
+  if(frame)
+    xbt_die("Unexpected namespace in a subprogram");
+  char* new_namespace = namespace == NULL ? xbt_strdup(name)
+    : bprintf("%s::%s", namespace, name);
+  MC_dwarf_handle_children(info, die, unit, frame, new_namespace);
 }
 
-static void MC_dwarf_handle_children(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame) {
+static void MC_dwarf_handle_children(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace) {
   Dwarf_Die child;
   int res;
   for (res=dwarf_child(die, &child); res==0; res=dwarf_siblingof(&child,&child)) {
-    MC_dwarf_handle_die(info, &child, unit, frame);
+    MC_dwarf_handle_die(info, &child, unit, frame, namespace);
   }
 }
 
-static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame) {
+static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace) {
   int tag = dwarf_tag(die);
-  switch (tag) {
-    case DW_TAG_array_type:
-    case DW_TAG_class_type:
-    case DW_TAG_enumeration_type:
-    case DW_TAG_typedef:
-    case DW_TAG_pointer_type:
-    case DW_TAG_string_type:
-    case DW_TAG_structure_type:
-    case DW_TAG_subroutine_type:
-    case DW_TAG_union_type:
-    case DW_TAG_ptr_to_member_type:
-    case DW_TAG_set_type:
-    case DW_TAG_subrange_type:
-    case DW_TAG_base_type:
-    case DW_TAG_const_type:
-    case DW_TAG_file_type:
-    case DW_TAG_packed_type:
-    case DW_TAG_volatile_type:
-    case DW_TAG_restrict_type:
-    case DW_TAG_interface_type:
-    case DW_TAG_unspecified_type:
-    case DW_TAG_mutable_type:
-    case DW_TAG_shared_type:
-      MC_dwarf_handle_type_die(info, die, unit);
+  mc_tag_class klass = MC_dwarf_tag_classify(tag);
+  switch (klass) {
+
+    // Type:
+    case mc_tag_type:
+      MC_dwarf_handle_type_die(info, die, unit, frame, namespace);
       break;
-    case DW_TAG_inlined_subroutine:
-    case DW_TAG_subprogram:
-      MC_dwarf_handle_subprogram_die(info, die, unit, frame);
+
+    // Program:
+    case mc_tag_subprogram:
+      MC_dwarf_handle_subprogram_die(info, die, unit, frame, namespace);
       return;
-    // case DW_TAG_formal_parameter:
-    case DW_TAG_variable:
-    case DW_TAG_formal_parameter:
-      MC_dwarf_handle_variable_die(info, die, unit, frame);
+
+    // Variable:
+    case mc_tag_variable:
+      MC_dwarf_handle_variable_die(info, die, unit, frame, namespace);
       break;
-  }
 
-  // Recursive processing of children DIE:
-  MC_dwarf_handle_children(info, die, unit, frame);
+    // Scope:
+    case mc_tag_scope:
+      // TODO
+      break;
+
+    case mc_tag_namespace:
+      mc_dwarf_handle_namespace_die(info, die, unit, frame, namespace);
+      break;
+
+    default:
+      break;
+
+  }
 }
 
 void MC_dwarf_get_variables(mc_object_info_t info) {
@@ -891,9 +1101,14 @@ void MC_dwarf_get_variables(mc_object_info_t info) {
   Dwarf_Off next_offset = 0;
   size_t length;
   while (dwarf_nextcu (dwarf, offset, &next_offset, &length, NULL, NULL, NULL) == 0) {
-    Dwarf_Die die;
-    if(dwarf_offdie(dwarf, offset+length, &die)!=NULL) {
-      MC_dwarf_handle_die(info, &die, &die, NULL);
+    Dwarf_Die unit_die;
+
+    if(dwarf_offdie(dwarf, offset+length, &unit_die)!=NULL) {
+      Dwarf_Die child;
+      int res;
+      for (res=dwarf_child(&unit_die, &child); res==0; res=dwarf_siblingof(&child,&child)) {
+        MC_dwarf_handle_die(info, &child, &unit_die, NULL, NULL);
+      }
     }
     offset = next_offset;
   }