/* 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. */
/** \brief The default DW_TAG_lower_bound for a given DW_AT_language.
*
* The default for a given language is defined in the DWARF spec.
+ *
+ * \param language consant as defined by the DWARf spec
*/
static uint64_t MC_dwarf_default_lower_bound(int lang);
+/** \brief Computes the the element_count of a DW_TAG_enumeration_type DIE
+ *
+ * This is the number of elements in a given array dimension.
+ *
+ * A reference of the compilation unit (DW_TAG_compile_unit) is
+ * needed because the default lower bound (when there is no DW_AT_lower_bound)
+ * depends of the language of the compilation unit (DW_AT_language).
+ *
+ * \param die DIE for the DW_TAG_enumeration_type or DW_TAG_subrange_type
+ * \param unit DIE of the DW_TAG_compile_unit
+ */
static uint64_t MC_dwarf_subrange_element_count(Dwarf_Die* die, Dwarf_Die* unit);
-/** \brief Computes the number of elements of a given DW_TAG_array_type
+/** \brief Computes the number of elements of a given DW_TAG_array_type.
*
+ * \param die DIE for the DW_TAG_array_type
*/
static uint64_t MC_dwarf_array_element_count(Dwarf_Die* die, Dwarf_Die* unit);
-/** \brief Checks if a given tag is a (known) type tag.
+/** \brief Process a DIE
+ *
+ * \param info the resulting object fot the library/binary file (output)
+ * \param die the current DIE
+ * \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);
+
+/** \brief Process a type DIE
*/
-static int MC_dwarf_tag_type(int tag);
-static void MC_dwarf_handle_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);
-static void MC_dwarf_handle_children(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit);
-static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit);
-static Dwarf_Die* MC_dwarf_resolve_die(Dwarf_Die* die, int attribute);
+/** \brief Calls MC_dwarf_handle_die on all childrend of the given die
+ *
+ * \param info the resulting object fot the library/binary file (output)
+ * \param die the current DIE
+ * \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);
+
+/** \brief Handle a variable (DW_TAG_variable or other)
+ *
+ * \param info the resulting object fot the library/binary file (output)
+ * \param die the current DIE
+ * \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);
+
+/** \brief Convert a libdw DWARF expression into a MC representation of the location
+ *
+ * \param expr array of DWARf operations
+ * \param len number of elements
+ * \return a new MC expression
+ */
+static dw_location_t MC_dwarf_get_expression(Dwarf_Op* expr, size_t len);
+
+/** \brief Get the DW_TAG_type of the DIE
+ *
+ * \param die DIE
+ * \return DW_TAG_type attribute as a new string (NULL if none)
+ */
+static char* MC_dwarf_at_type(Dwarf_Die* die);
+
+/** \brief Get the name of an attribute (DW_AT_*) from its code
+ *
+ * \param attr attribute code (see the DWARF specification)
+ * \return name of the attribute
+ */
const char* MC_dwarf_attrname(int attr) {
switch (attr) {
#include "mc_dwarf_attrnames.h"
}
}
+/** \brief Get the name of a dwarf tag (DW_TAG_*) from its code
+ *
+ * \param tag tag code (see the DWARF specification)
+ * \return name of the tag
+ */
const char* MC_dwarf_tagname(int tag) {
switch (tag) {
#include "mc_dwarf_tagnames.h"
}
}
+#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;
+ }
+}
+
+/** \brief Get the name of the tag of a given DIE
+ *
+ * \param die DIE
+ * \return name of the tag of this DIE
+ */
static inline const char* MC_dwarf_die_tagname(Dwarf_Die* die) {
return MC_dwarf_tagname(dwarf_tag(die));
}
// ***** Attributes
+/** \brief Get an attribute of a given DIE as a string
+ *
+ * \param the DIE
+ * \param attribute attribute
+ * \return value of the given attribute of the given DIE
+ */
static const char* MC_dwarf_attr_string(Dwarf_Die* die, int attribute) {
Dwarf_Attribute attr;
if (!dwarf_attr_integrate(die, attribute, &attr)) {
}
}
-// Return a new string for the type (NULL if none)
+/** \brief Get the linkage name of a DIE.
+ *
+ * Use either DW_AT_linkage_name or DW_AR_MIPS_linkage_name.
+ *
+ * \param DIE
+ * \return linkage name of the given DIE (or NULL)
+ * */
+static const char* MC_dwarf_at_linkage_name(Dwarf_Die* die) {
+ const char* name = MC_dwarf_attr_string(die, DW_AT_linkage_name);
+ if (!name)
+ name = MC_dwarf_attr_string(die, DW_AT_MIPS_linkage_name);
+ return name;
+}
+
+/** \brief Create a location list from a given attribute
+ *
+ * \param die the DIE
+ * \param attr the attribute
+ * \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(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;
+ xbt_dynar_t loclist = xbt_dynar_new(sizeof(dw_location_entry_t), NULL);
+ location->location.loclist = loclist;
+
+ ptrdiff_t offset = 0;
+ Dwarf_Addr base, start, end;
+ Dwarf_Op *expr;
+ size_t len;
+
+ while (1) {
+
+ offset = dwarf_getlocations(attr, offset, &base, &start, &end, &expr, &len);
+ if (offset==0)
+ return location;
+ else if (offset==-1)
+ xbt_die("Error while loading location list");
+
+ dw_location_entry_t new_entry = xbt_new0(s_dw_location_entry_t, 1);
+
+ 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);
+
+ }
+}
+
+/** \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.
+ *
+ * \param die the DIE
+ * \param attr the 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(mc_object_info_t info, Dwarf_Die* die, Dwarf_Attribute* attr) {
+ int form = dwarf_whatform(attr);
+ switch (form) {
+
+ // The attribute is an DWARF location expression:
+ case DW_FORM_exprloc:
+ case DW_FORM_block1: // not in the spec
+ case DW_FORM_block2:
+ case DW_FORM_block4:
+ case DW_FORM_block:
+ {
+ Dwarf_Op* expr;
+ size_t len;
+ if (dwarf_getlocation(attr, &expr, &len))
+ xbt_die("Could not read location expression");
+ return MC_dwarf_get_expression(expr, len);
+ }
+
+ // 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(info, die, attr);
+ }
+ break;
+
+ default:
+ xbt_die("Unexpected form %i list for location in attribute %s of <%p>%s",
+ form,
+ MC_dwarf_attrname(attr->code),
+ (void*) dwarf_dieoffset(die),
+ MC_dwarf_attr_string(die, DW_AT_name));
+ return NULL;
+ }
+}
+
+/** \brief Get the location expression or location list from an attribute
+ *
+ * Processes direct expressions as well as location lists.
+ *
+ * \param die the DIE
+ * \param attribute the attribute code
+ * \return MC specific representation of the location represented by the given attribute
+ * of the given die
+ */
+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(info, die, &attr);
+}
+
static char* MC_dwarf_at_type(Dwarf_Die* die) {
Dwarf_Attribute attr;
if (dwarf_hasattr_integrate(die, DW_AT_type)) {
else return NULL;
}
+static uint64_t MC_dwarf_attr_addr(Dwarf_Die* die, int attribute) {
+ Dwarf_Attribute attr;
+ if(dwarf_attr_integrate(die, attribute, &attr)==NULL)
+ return 0;
+ Dwarf_Addr value;
+ if (dwarf_formaddr(&attr, &value) == 0)
+ return (uint64_t) value;
+ else
+ return 0;
+}
+
static uint64_t MC_dwarf_attr_uint(Dwarf_Die* die, int attribute, uint64_t default_value) {
Dwarf_Attribute attr;
+ if (dwarf_attr_integrate(die, attribute, &attr)==NULL)
+ return default_value;
Dwarf_Word value;
return dwarf_formudata(dwarf_attr_integrate(die, attribute, &attr), &value) == 0 ? (uint64_t) value : default_value;
}
+static bool MC_dwarf_attr_flag(Dwarf_Die* die, int attribute, int integrate) {
+ Dwarf_Attribute attr;
+ if ((integrate ? dwarf_attr_integrate(die, attribute, &attr)
+ : dwarf_attr(die, attribute, &attr))==0)
+ return false;
+
+ bool result;
+ if (dwarf_formflag(&attr, &result))
+ xbt_die("Unexpected form for attribute %s",
+ MC_dwarf_attrname(attribute));
+ return result;
+}
+
static uint64_t MC_dwarf_default_lower_bound(int lang) {
switch(lang) {
case DW_LANG_C:
}
static uint64_t MC_dwarf_subrange_element_count(Dwarf_Die* die, Dwarf_Die* unit) {
+ xbt_assert(dwarf_tag(die)==DW_TAG_enumeration_type ||dwarf_tag(die)==DW_TAG_subrange_type,
+ "MC_dwarf_subrange_element_count called with DIE of type %s", MC_dwarf_die_tagname(die));
+
// Use DW_TAG_count if present:
if (dwarf_hasattr_integrate(die, DW_AT_count)) {
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):
} 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) {
}
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);
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:
{
- //TODO, location can be an integer as well
Dwarf_Op* expr;
size_t len;
if (dwarf_getlocation(&attr, &expr, &len)) {
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) {
MC_dwarf_fill_member_location(type, member, &child);
+ if (!member->dw_type_id) {
+ xbt_die("Missing type for member %s of <%p>%s", member->name, type->id, type->name);
+ }
+
xbt_dynar_push(type->members, &member);
}
}
}
+/** \brief Create a MC type object from a DIE
+ *
+ * \param info current object info object
+ * \param DIE (for a given type);
+ * \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) {
dw_type_t type = xbt_new0(s_dw_type_t, 1);
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) */
+static dw_location_t MC_dwarf_get_expression_element(Dwarf_Op* op) {
+ dw_location_t element = xbt_new0(s_dw_location_t, 1);
+ uint8_t atom = op->atom;
+ if (atom >= DW_OP_reg0 && atom<= DW_OP_reg31) {
+ element->type = e_dw_register;
+ element->location.reg = atom - DW_OP_reg0;
+ }
+ else if (atom >= DW_OP_breg0 && atom<= DW_OP_breg31) {
+ element->type = e_dw_bregister_op;
+ element->location.reg = atom - DW_OP_breg0;
+ element->location.breg_op.offset = op->number;
+ }
+ else if (atom >= DW_OP_lit0 && atom<= DW_OP_lit31) {
+ element->type = e_dw_lit;
+ element->location.reg = atom - DW_OP_lit0;
+ }
+ else switch (atom) {
+ case DW_OP_fbreg:
+ element->type = e_dw_fbregister_op;
+ element->location.fbreg_op = op->number;
+ break;
+ case DW_OP_piece:
+ element->type = e_dw_piece;
+ element->location.piece = op->number;
+ break;
+ case DW_OP_plus_uconst:
+ element->type = e_dw_plus_uconst;
+ element->location.plus_uconst = op->number;
+ break;
+ case DW_OP_abs:
+ element->type = e_dw_arithmetic;
+ element->location.arithmetic = xbt_strdup("abs");
+ break;
+ case DW_OP_and:
+ element->type = e_dw_arithmetic;
+ element->location.arithmetic = xbt_strdup("and");
+ break;
+ case DW_OP_div:
+ element->type = e_dw_arithmetic;
+ element->location.arithmetic = xbt_strdup("div");
+ break;
+ case DW_OP_minus:
+ element->type = e_dw_arithmetic;
+ element->location.arithmetic = xbt_strdup("minus");
+ break;
+ case DW_OP_mod:
+ element->type = e_dw_arithmetic;
+ element->location.arithmetic = xbt_strdup("mod");
+ break;
+ case DW_OP_mul:
+ element->type = e_dw_arithmetic;
+ element->location.arithmetic = xbt_strdup("mul");
+ break;
+ case DW_OP_neg:
+ element->type = e_dw_arithmetic;
+ element->location.arithmetic = xbt_strdup("neg");
+ break;
+ case DW_OP_not:
+ element->type = e_dw_arithmetic;
+ element->location.arithmetic = xbt_strdup("not");
+ break;
+ case DW_OP_or:
+ element->type = e_dw_arithmetic;
+ element->location.arithmetic = xbt_strdup("or");
+ break;
+ case DW_OP_plus:
+ element->type = e_dw_arithmetic;
+ element->location.arithmetic = xbt_strdup("plus");
+ break;
+
+ case DW_OP_stack_value:
+ // Why nothing here?
+ xbt_free(element);
+ return NULL;
+
+ case DW_OP_deref_size:
+ element->type = e_dw_deref;
+ element->location.deref_size = (unsigned int short) op->number;
+ break;
+ case DW_OP_deref:
+ element->type = e_dw_deref;
+ element->location.deref_size = sizeof(void *);
+ break;
+ case DW_OP_constu:
+ element->type = e_dw_uconstant;
+ element->location.uconstant.bytes = 1;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+ case DW_OP_consts:
+ element->type = e_dw_sconstant;
+ element->location.uconstant.bytes = 1;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+
+ case DW_OP_const1u:
+ element->type = e_dw_uconstant;
+ element->location.uconstant.bytes = 1;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+ case DW_OP_const2u:
+ element->type = e_dw_uconstant;
+ element->location.uconstant.bytes = 2;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+ case DW_OP_const4u:
+ element->type = e_dw_uconstant;
+ element->location.uconstant.bytes = 4;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+ case DW_OP_const8u:
+ element->type = e_dw_uconstant;
+ element->location.uconstant.bytes = 8;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+
+ case DW_OP_const1s:
+ element->type = e_dw_sconstant;
+ element->location.uconstant.bytes = 1;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+ case DW_OP_const2s:
+ element->type = e_dw_sconstant;
+ element->location.uconstant.bytes = 2;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+ case DW_OP_const4s:
+ element->type = e_dw_sconstant;
+ element->location.uconstant.bytes = 4;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+ case DW_OP_const8s:
+ element->type = e_dw_sconstant;
+ element->location.uconstant.bytes = 8;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+ default:
+ element->type = e_dw_unsupported;
+ break;
+ }
+ return element;
+}
+
+/** \brief Convert libdw location expresion into native one */
+static dw_location_t MC_dwarf_get_expression(Dwarf_Op* expr, size_t len) {
+ dw_location_t loc = xbt_new0(s_dw_location_t, 1);
+ loc->type = e_dw_compose;
+ loc->location.compose = xbt_dynar_new(sizeof(dw_location_t), NULL);
+
+ int i;
+ for (i=0; i!=len; ++i) {
+ dw_location_t element = MC_dwarf_get_expression_element(expr+i);
+ if (element)
+ xbt_dynar_push(loc->location.compose, &element);
+ }
+
+ return loc;
+}
+
+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) {
+ // Drop declaration:
+ if (MC_dwarf_attr_flag(die, DW_AT_declaration, false))
+ return NULL;
+
+ Dwarf_Attribute attr_location;
+ if (dwarf_attr(die, DW_AT_location, &attr_location)==NULL) {
+ // No location: do not add it ?
+ return NULL;
+ }
+
+ 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));
+ variable->type_origin = MC_dwarf_at_type(die);
+
+ 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;
+ if (dwarf_getlocation(&attr_location, &expr, &len)) {
+ xbt_die(
+ "Could not read location expression in DW_AT_location of variable <%p>%s",
+ (void*) variable->dwarf_offset, variable->name);
+ }
+
+ if (len==1 && expr[0].atom == DW_OP_addr) {
+ 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_exec : 0;
+ variable->address = (void*) (base + offset);
+ } else {
+ variable->location = MC_dwarf_get_expression(expr, len);
+ }
+
+ break;
+ }
+ 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 0x%x (%i), class 0x%x (%i) list for location in <%p>%s",
+ form, form, klass, klass, (void*) variable->dwarf_offset, variable->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);
+ if(variable==NULL)
+ return;
+ MC_dwarf_register_variable(info, frame, variable);
+}
-static void MC_dwarf_handle_children(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit) {
+static void MC_dwarf_handle_subprogram_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t parent_frame) {
+ 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);
+
+ // 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 = ((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:
+
+ // Handle children:
+ MC_dwarf_handle_children(info, die, unit, frame);
+
+ // Register it:
+ xbt_dict_set(info->local_variables, frame->name, frame, NULL);
+}
+
+static void MC_dwarf_handle_children(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame) {
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);
+ MC_dwarf_handle_die(info, &child, unit, frame);
}
}
-static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit) {
+static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame) {
int tag = dwarf_tag(die);
-
switch (tag) {
case DW_TAG_array_type:
case DW_TAG_class_type:
case DW_TAG_shared_type:
MC_dwarf_handle_type_die(info, die, unit);
break;
- case DW_TAG_inlined_subroutine:
case DW_TAG_subprogram:
- // TODO
- break;
+ MC_dwarf_handle_subprogram_die(info, die, unit, frame);
+ return;
+ // case DW_TAG_formal_parameter:
case DW_TAG_variable:
- // TODO
+ case DW_TAG_formal_parameter:
+ MC_dwarf_handle_variable_die(info, die, unit, frame);
break;
}
// Recursive processing of children DIE:
- MC_dwarf_handle_children(info, die, unit);
+ MC_dwarf_handle_children(info, die, unit, frame);
}
-void MC_dwarf_get_variables_libdw(mc_object_info_t info) {
+void MC_dwarf_get_variables(mc_object_info_t info) {
int fd = open(info->file_name, O_RDONLY);
if (fd<0) {
xbt_die("Could not open file %s", info->file_name);
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);
+ MC_dwarf_handle_die(info, &die, &die, NULL);
}
offset = next_offset;
}
