Add DIContext::getLineInfoForAddressRange() function and test. This function allows a caller to obtain a table of line information for a function using the function's address and size.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173537 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/DebugInfo/DWARFDebugLine.cpp b/lib/DebugInfo/DWARFDebugLine.cpp
index 16ef896..7b32d4f 100644
--- a/lib/DebugInfo/DWARFDebugLine.cpp
+++ b/lib/DebugInfo/DWARFDebugLine.cpp
@@ -525,6 +525,81 @@
}
bool
+DWARFDebugLine::LineTable::lookupAddressRange(uint64_t address,
+ uint64_t size,
+ std::vector<uint32_t>& result) const {
+ if (Sequences.empty())
+ return false;
+ uint64_t end_addr = address + size;
+ // 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);
+ if (seq_pos == last_seq || seq_pos->LowPC != address) {
+ if (seq_pos == first_seq)
+ return false;
+ seq_pos--;
+ }
+ if (!seq_pos->containsPC(address))
+ return false;
+
+ SequenceIter start_pos = seq_pos;
+
+ // Add the rows from the first sequence to the vector, starting with the
+ // index we just calculated
+
+ while (seq_pos != last_seq && seq_pos->LowPC < end_addr) {
+ DWARFDebugLine::Sequence cur_seq = *seq_pos;
+ uint32_t first_row_index;
+ uint32_t last_row_index;
+ if (seq_pos == start_pos) {
+ // For the first sequence, we need to find which row in the sequence is the
+ // first in our range. 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() + cur_seq.FirstRowIndex;
+ RowIter last_row = Rows.begin() + cur_seq.LastRowIndex;
+ RowIter row_pos = std::upper_bound(first_row, last_row, row,
+ DWARFDebugLine::Row::orderByAddress);
+ // The 'row_pos' iterator references the first row that is greater than
+ // our start address. Unless that's the first row, we want to start at
+ // the row before that.
+ first_row_index = cur_seq.FirstRowIndex + (row_pos - first_row);
+ if (row_pos != first_row)
+ --first_row_index;
+ } else
+ first_row_index = cur_seq.FirstRowIndex;
+
+ // For the last sequence in our range, we need to figure out the last row in
+ // range. For all other sequences we can go to the end of the sequence.
+ if (cur_seq.HighPC > end_addr) {
+ DWARFDebugLine::Row row;
+ row.Address = end_addr;
+ RowIter first_row = Rows.begin() + cur_seq.FirstRowIndex;
+ RowIter last_row = Rows.begin() + cur_seq.LastRowIndex;
+ RowIter row_pos = std::upper_bound(first_row, last_row, row,
+ DWARFDebugLine::Row::orderByAddress);
+ // The 'row_pos' iterator references the first row that is greater than
+ // our end address. The row before that is the last row we want.
+ last_row_index = cur_seq.FirstRowIndex + (row_pos - first_row) - 1;
+ } else
+ // Contrary to what you might expect, DWARFDebugLine::SequenceLastRowIndex
+ // isn't a valid index within the current sequence. It's that plus one.
+ last_row_index = cur_seq.LastRowIndex - 1;
+
+ for (uint32_t i = first_row_index; i <= last_row_index; ++i) {
+ result.push_back(i);
+ }
+
+ ++seq_pos;
+ }
+}
+
+bool
DWARFDebugLine::LineTable::getFileNameByIndex(uint64_t FileIndex,
bool NeedsAbsoluteFilePath,
std::string &Result) const {