-DWARFDebugLine::LineTable::lookupAddress(uint64_t address,
- uint64_t cu_high_pc) const {
- uint32_t index = UINT32_MAX;
- if (!Rows.empty()) {
- // Use the lower_bound algorithm to perform a binary search since we know
- // that our line table data is ordered by address.
- DWARFDebugLine::Row row;
- row.Address = address;
- typedef std::vector<Row>::const_iterator iterator;
- iterator begin_pos = Rows.begin();
- iterator end_pos = Rows.end();
- iterator pos = std::lower_bound(begin_pos, end_pos, row,
- findMatchingAddress);
- if (pos == end_pos) {
- if (address < cu_high_pc)
- return Rows.size()-1;
- } else {
- // Rely on fact that we are using a std::vector and we can do
- // pointer arithmetic to find the row index (which will be one less
- // that what we found since it will find the first position after
- // the current address) since std::vector iterators are just
- // pointers to the container type.
- index = pos - begin_pos;
- if (pos->Address > address) {
- if (index > 0)
- --index;
- else
- index = UINT32_MAX;
- }
- }
+DWARFDebugLine::LineTable::lookupAddress(uint64_t address) const {
+ uint32_t unknown_index = UINT32_MAX;
+ if (Sequences.empty())
+ return unknown_index;
+ // First, find an instruction sequence containing the given address.
+ DWARFDebugLine::Sequence sequence;
+ sequence.LowPC = address;
+ SequenceIter first_seq = Sequences.begin();
+ SequenceIter last_seq = Sequences.end();
+ SequenceIter seq_pos = std::lower_bound(first_seq, last_seq, sequence,
+ DWARFDebugLine::Sequence::orderByLowPC);
+ DWARFDebugLine::Sequence found_seq;
+ if (seq_pos == last_seq) {
+ found_seq = Sequences.back();
+ } else if (seq_pos->LowPC == address) {
+ found_seq = *seq_pos;
+ } else {
+ if (seq_pos == first_seq)
+ return unknown_index;
+ found_seq = *(seq_pos - 1);
+ }
+ if (!found_seq.containsPC(address))
+ return unknown_index;
+ // Search for instruction address in the rows describing the sequence.
+ // Rows are stored in a vector, so we may use arithmetical operations with
+ // iterators.
+ DWARFDebugLine::Row row;
+ row.Address = address;
+ RowIter first_row = Rows.begin() + found_seq.FirstRowIndex;
+ RowIter last_row = Rows.begin() + found_seq.LastRowIndex;
+ RowIter row_pos = std::lower_bound(first_row, last_row, row,
+ DWARFDebugLine::Row::orderByAddress);
+ if (row_pos == last_row) {
+ return found_seq.LastRowIndex - 1;
+ }
+ uint32_t index = found_seq.FirstRowIndex + (row_pos - first_row);
+ if (row_pos->Address > address) {
+ if (row_pos == first_row)
+ return unknown_index;
+ else
+ index--;