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implement get_var_size to retrieve variable byte size from DWARF

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This commit is contained in:
Gabriel Ionita 2025-10-25 13:25:00 +01:00
parent 01c96b0467
commit 481a5c6cb2
Signed by: gabi
SSH Key Fingerprint: SHA256:mrbYmB/SGtDvT3etRoS6pDrMYWxR0/B5GSF6rR3qhhc
1 changed files with 75 additions and 0 deletions
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75
src/symbol.cpp
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@ -149,6 +149,81 @@ Dwarf_Addr Symbol::get_global_var_addr(Dwarf_Debug dbg, Dwarf_Die die) {
return addr;
}
size_t Symbol::get_var_size(Dwarf_Debug dbg, Dwarf_Die die) {
Dwarf_Error err;
Dwarf_Attribute type_attr;
Dwarf_Off type_offset;
Dwarf_Die type_die;
Dwarf_Half tag;
// Get the type attribute
if (dwarf_attr(die, DW_AT_type, &type_attr, &err) != DW_DLV_OK)
return 0;
// Get the type offset
if (dwarf_global_formref(type_attr, &type_offset, &err) != DW_DLV_OK) {
dwarf_dealloc(dbg, type_attr, DW_DLA_ATTR);
return 0;
}
dwarf_dealloc(dbg, type_attr, DW_DLA_ATTR);
// Get the type DIE
if (dwarf_offdie_b(dbg, type_offset, true, &type_die, &err) != DW_DLV_OK)
return 0;
// Get the tag of the type DIE
if (dwarf_tag(type_die, &tag, &err) != DW_DLV_OK) {
dwarf_dealloc(dbg, type_die, DW_DLA_DIE);
return 0;
}
// Skip through const/volatile qualifiers
while (tag == DW_TAG_const_type || tag == DW_TAG_volatile_type) {
Dwarf_Attribute inner_type_attr;
Dwarf_Off inner_type_offset;
Dwarf_Die inner_type_die;
if (dwarf_attr(type_die, DW_AT_type, &inner_type_attr, &err) != DW_DLV_OK) {
dwarf_dealloc(dbg, type_die, DW_DLA_DIE);
return 0;
}
if (dwarf_global_formref(inner_type_attr, &inner_type_offset, &err) != DW_DLV_OK) {
dwarf_dealloc(dbg, inner_type_attr, DW_DLA_ATTR);
dwarf_dealloc(dbg, type_die, DW_DLA_DIE);
return 0;
}
dwarf_dealloc(dbg, inner_type_attr, DW_DLA_ATTR);
if (dwarf_offdie_b(dbg, inner_type_offset, true, &inner_type_die, &err) != DW_DLV_OK) {
dwarf_dealloc(dbg, type_die, DW_DLA_DIE);
return 0;
}
dwarf_dealloc(dbg, type_die, DW_DLA_DIE);
type_die = inner_type_die;
if (dwarf_tag(type_die, &tag, &err) != DW_DLV_OK) {
dwarf_dealloc(dbg, type_die, DW_DLA_DIE);
return 0;
}
}
// Get the byte size
Dwarf_Attribute size_attr;
Dwarf_Unsigned byte_size = 0;
if (dwarf_attr(type_die, DW_AT_byte_size, &size_attr, &err) == DW_DLV_OK) {
dwarf_formudata(size_attr, &byte_size, &err);
dwarf_dealloc(dbg, size_attr, DW_DLA_ATTR);
}
dwarf_dealloc(dbg, type_die, DW_DLA_DIE);
return byte_size;
}
void Symbol::list_global_integer_vars(Dwarf_Debug dbg) {
Dwarf_Error err;
Dwarf_Unsigned cu_hdr_len, abbr_offset, next_cu_hdr;