-void DWARFCompileUnit::setDIERelations() {
- if (DieArray.empty())
- return;
- DWARFDebugInfoEntryMinimal *die_array_begin = &DieArray.front();
- DWARFDebugInfoEntryMinimal *die_array_end = &DieArray.back();
- DWARFDebugInfoEntryMinimal *curr_die;
- // We purposely are skipping the last element in the array in the loop below
- // so that we can always have a valid next item
- for (curr_die = die_array_begin; curr_die < die_array_end; ++curr_die) {
- // Since our loop doesn't include the last element, we can always
- // safely access the next die in the array.
- DWARFDebugInfoEntryMinimal *next_die = curr_die + 1;
-
- const DWARFAbbreviationDeclaration *curr_die_abbrev =
- curr_die->getAbbreviationDeclarationPtr();
-
- if (curr_die_abbrev) {
- // Normal DIE
- if (curr_die_abbrev->hasChildren())
- next_die->setParent(curr_die);
- else
- curr_die->setSibling(next_die);
- } else {
- // NULL DIE that terminates a sibling chain
- DWARFDebugInfoEntryMinimal *parent = curr_die->getParent();
- if (parent)
- parent->setSibling(next_die);
- }
- }
-
- // Since we skipped the last element, we need to fix it up!
- if (die_array_begin < die_array_end)
- curr_die->setParent(die_array_begin);
-}
-
-size_t DWARFCompileUnit::extractDIEsIfNeeded(bool cu_die_only) {
- const size_t initial_die_array_size = DieArray.size();
- if ((cu_die_only && initial_die_array_size > 0) ||
- initial_die_array_size > 1)
- return 0; // Already parsed
-
- // Set the offset to that of the first DIE and calculate the start of the
- // next compilation unit header.
- uint32_t offset = getFirstDIEOffset();
- uint32_t next_cu_offset = getNextCompileUnitOffset();
-
- DWARFDebugInfoEntryMinimal die;
- // Keep a flat array of the DIE for binary lookup by DIE offset
- uint32_t depth = 0;
- // We are in our compile unit, parse starting at the offset
- // we were told to parse
-
- const uint8_t *fixed_form_sizes =
- DWARFFormValue::getFixedFormSizesForAddressSize(getAddressByteSize());
-
- while (offset < next_cu_offset &&
- die.extractFast(this, fixed_form_sizes, &offset)) {
-
- if (depth == 0) {
- uint64_t base_addr =
- die.getAttributeValueAsUnsigned(this, DW_AT_low_pc, -1U);
- if (base_addr == -1U)
- base_addr = die.getAttributeValueAsUnsigned(this, DW_AT_entry_pc, 0);
- setBaseAddress(base_addr);
- }
-
- if (cu_die_only) {
- addDIE(die);
- return 1;
- }
- else if (depth == 0 && initial_die_array_size == 1) {
- // Don't append the CU die as we already did that
- } else {
- addDIE (die);
- }
-
- const DWARFAbbreviationDeclaration *abbrDecl =
- die.getAbbreviationDeclarationPtr();
- if (abbrDecl) {
- // Normal DIE
- if (abbrDecl->hasChildren())
- ++depth;
- } else {
- // NULL DIE.
- if (depth > 0)
- --depth;
- if (depth == 0)
- break; // We are done with this compile unit!
- }
-
- }
-
- // Give a little bit of info if we encounter corrupt DWARF (our offset
- // should always terminate at or before the start of the next compilation
- // unit header).
- if (offset > next_cu_offset) {
- fprintf (stderr, "warning: DWARF compile unit extends beyond its bounds cu 0x%8.8x at 0x%8.8x'\n", getOffset(), offset);
- }
-
- setDIERelations();
- return DieArray.size();