DIERef::DIERef(const DWARFFormValue &form_value)
: cu_offset(DW_INVALID_OFFSET), die_offset(DW_INVALID_OFFSET) {
if (form_value.IsValid()) {
const DWARFUnit *dwarf_cu = form_value.GetCompileUnit();
if (dwarf_cu) {
if (dwarf_cu->GetBaseObjOffset() != DW_INVALID_OFFSET)
cu_offset = dwarf_cu->GetBaseObjOffset();
else
cu_offset = dwarf_cu->GetOffset();
}
die_offset = form_value.Reference();
}
}
int
DWARFFormValue::Compare (const DWARFFormValue& a_value, const DWARFFormValue& b_value, const DWARFCompileUnit* a_cu, const DWARFCompileUnit* b_cu, const DWARFDataExtractor* debug_str_data_ptr)
{
dw_form_t a_form = a_value.Form();
dw_form_t b_form = b_value.Form();
if (a_form < b_form)
return -1;
if (a_form > b_form)
return 1;
switch (a_form)
{
case DW_FORM_addr:
case DW_FORM_flag:
case DW_FORM_data1:
case DW_FORM_data2:
case DW_FORM_data4:
case DW_FORM_data8:
case DW_FORM_udata:
case DW_FORM_ref_addr:
case DW_FORM_sec_offset:
case DW_FORM_flag_present:
case DW_FORM_ref_sig8:
{
uint64_t a = a_value.Unsigned();
uint64_t b = b_value.Unsigned();
if (a < b)
return -1;
if (a > b)
return 1;
return 0;
}
case DW_FORM_sdata:
{
int64_t a = a_value.Signed();
int64_t b = b_value.Signed();
if (a < b)
return -1;
if (a > b)
return 1;
return 0;
}
case DW_FORM_string:
case DW_FORM_strp:
{
const char *a_string = a_value.AsCString(debug_str_data_ptr);
const char *b_string = b_value.AsCString(debug_str_data_ptr);
if (a_string == b_string)
return 0;
else if (a_string && b_string)
return strcmp(a_string, b_string);
else if (a_string == NULL)
return -1; // A string is NULL, and B is valid
else
return 1; // A string valid, and B is NULL
}
case DW_FORM_block:
case DW_FORM_block1:
case DW_FORM_block2:
case DW_FORM_block4:
case DW_FORM_exprloc:
{
uint64_t a_len = a_value.Unsigned();
uint64_t b_len = b_value.Unsigned();
if (a_len < b_len)
return -1;
if (a_len > b_len)
return 1;
// The block lengths are the same
return memcmp(a_value.BlockData(), b_value.BlockData(), a_value.Unsigned());
}
break;
case DW_FORM_ref1:
case DW_FORM_ref2:
case DW_FORM_ref4:
case DW_FORM_ref8:
case DW_FORM_ref_udata:
{
uint64_t a = a_value.Reference(a_cu);
uint64_t b = b_value.Reference(b_cu);
if (a < b)
return -1;
if (a > b)
return 1;
return 0;
}
case DW_FORM_indirect:
assert(!"This shouldn't happen after the form has been extracted...");
break;
default:
assert(!"Unhandled DW_FORM");
break;
}
return -1;
}
