[llvm-dwarfdump] - Teach dwarfdump to dump gdb-index section.

gold linker's --gdb-index option currently is able to create the .gdb_index section that allows GDB to locate and read the .dwo files as it needs them,
this helps reduce the total size of the object files processed by the linker.

More info about that:
https://gcc.gnu.org/wiki/DebugFission
https://sourceware.org/gdb/onlinedocs/gdb/Index-Section-Format.html

Patch teaches dwarfdump tool to dump this section.

Differential revision: https://reviews.llvm.org/D21503

llvm-svn: 282235

1 files changed, 17 insertions, 0 deletions

diff --git a/llvm/lib/DebugInfo/DWARF/DWARFContext.cpp b/llvm/lib/DebugInfo/DWARF/DWARFContext.cpp
index e8ea71b325a..1a0b7e568de 100644
--- a/llvm/lib/DebugInfo/DWARF/DWARFContext.cpp
+++ b/llvm/lib/DebugInfo/DWARF/DWARFContext.cpp
@@ -256,6 +256,12 @@ void DWARFContext::dump(raw_ostream &OS, DIDumpType DumpType, bool DumpEH) {
     }
   }
 
+  if ((DumpType == DIDT_All || DumpType == DIDT_GdbIndex) &&
+      !getGdbIndexSection().empty()) {
+    OS << "\n.gnu_index contents:\n";
+    getGdbIndex().dump(OS);
+  }
+
   if (DumpType == DIDT_All || DumpType == DIDT_AppleNames)
     dumpAccelSection(OS, "apple_names", getAppleNamesSection(),
                      getStringSection(), isLittleEndian());
@@ -295,6 +301,16 @@ const DWARFUnitIndex &DWARFContext::getTUIndex() {
   return *TUIndex;
 }
 
+DWARFGdbIndex &DWARFContext::getGdbIndex() {
+  if (GdbIndex)
+    return *GdbIndex;
+
+  DataExtractor GdbIndexData(getGdbIndexSection(), true /*LE*/, 0);
+  GdbIndex = llvm::make_unique<DWARFGdbIndex>();
+  GdbIndex->parse(GdbIndexData);
+  return *GdbIndex;
+}
+
 const DWARFDebugAbbrev *DWARFContext::getDebugAbbrev() {
   if (Abbrev)
     return Abbrev.get();
@@ -718,6 +734,7 @@ DWARFContextInMemory::DWARFContextInMemory(const object::ObjectFile &Obj,
             .Case("apple_objc", &AppleObjCSection.Data)
             .Case("debug_cu_index", &CUIndexSection)
             .Case("debug_tu_index", &TUIndexSection)
+            .Case("gdb_index", &GdbIndexSection)
             // Any more debug info sections go here.
             .Default(nullptr);
     if (SectionData) {