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

1 files changed, 75 insertions, 0 deletions

diff --git a/lib/DebugInfo/DWARFDebugLine.cpp b/lib/DebugInfo/DWARFDebugLine.cpp
index 16ef896ca7..7b32d4fe9e 100644
--- a/lib/DebugInfo/DWARFDebugLine.cpp
+++ b/lib/DebugInfo/DWARFDebugLine.cpp
@@ -525,6 +525,81 @@ DWARFDebugLine::LineTable::lookupAddress(uint64_t address) const {
 }
 
 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 {