DebugInfo: Accurately propagate the section used by a relocation when accessing ranges defined by low/high_pc

This is difficult/not possible to test in LLVM, but is visible as a
crash in LLD when parsing DWARF to generate gdb-index.

This function is called by llvm-dwarfdump when parsing high_pc for
non-verbose output (to print the actual high_pc rather than the low_pc
relative value), but in that case llvm-dwarfdump doesn't print section
names (if it did, it would hit this problem).

We could add some other features to llvm-dwarfdump to expose this, but
nothing really springs to my mind. I will add a test to lld, though.

llvm-svn: 350010

1 files changed, 4 insertions, 4 deletions

diff --git a/llvm/lib/DebugInfo/DWARF/DWARFDie.cpp b/llvm/lib/DebugInfo/DWARF/DWARFDie.cpp
index fd692ab519c..81ef0c8c7ae 100644
--- a/llvm/lib/DebugInfo/DWARF/DWARFDie.cpp
+++ b/llvm/lib/DebugInfo/DWARF/DWARFDie.cpp
@@ -466,13 +466,13 @@ Optional<uint64_t> DWARFDie::getHighPC(uint64_t LowPC) const {
 bool DWARFDie::getLowAndHighPC(uint64_t &LowPC, uint64_t &HighPC,
                                uint64_t &SectionIndex) const {
   auto F = find(DW_AT_low_pc);
-  auto LowPcAddr = toAddress(F);
+  auto LowPcAddr = toSectionedAddress(F);
   if (!LowPcAddr)
     return false;
-  if (auto HighPcAddr = getHighPC(*LowPcAddr)) {
-    LowPC = *LowPcAddr;
+  if (auto HighPcAddr = getHighPC(LowPcAddr->Address)) {
+    LowPC = LowPcAddr->Address;
     HighPC = *HighPcAddr;
-    SectionIndex = F->getSectionIndex();
+    SectionIndex = LowPcAddr->SectionIndex;
     return true;
   }
   return false;