[LLDB] - Add support for DW_RLE_start_end entries (.debug_rnglists)

DWARF5 describes DW_RLE_start_end as:

This is a form of bounded range entry that has two target address operands.
Each operand is the same size as used in DW_FORM_addr. These indicate
the starting and ending addresses, respectively, that define the address range
for which the following location is valid.

The patch implements the support.

Differential revision: https://reviews.llvm.org/D53193

llvm-svn: 344674

1 files changed, 8 insertions, 1 deletions

diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugRanges.cpp b/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugRanges.cpp
index e891fce4288..da97e90c672 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugRanges.cpp
+++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugRanges.cpp
@@ -143,10 +143,17 @@ bool DWARFDebugRngLists::ExtractRangeList(const DWARFDataExtractor &data,
       break;
     }
 
+    case DW_RLE_start_end: {
+      dw_addr_t begin = data.GetMaxU64(offset_ptr, addrSize);
+      dw_addr_t end = data.GetMaxU64(offset_ptr, addrSize);
+      rangeList.Append(DWARFRangeList::Entry(begin, end - begin));
+      break;
+    }
+
     default:
       // Next encodings are not yet supported:
       // DW_RLE_base_addressx, DW_RLE_startx_endx, DW_RLE_startx_length,
-      // DW_RLE_offset_pair, DW_RLE_base_address, DW_RLE_start_end
+      // DW_RLE_offset_pair, DW_RLE_base_address.
       lldbassert(0 && "unknown range list entry encoding");
       error = true;
     }