dwarfdump: First piece of support for DWP dumping

Just a tiny piece of index dumping - the header in this instance.

llvm-svn: 252781

3 files changed, 52 insertions, 0 deletions

diff --git a/llvm/lib/DebugInfo/DWARF/CMakeLists.txt b/llvm/lib/DebugInfo/DWARF/CMakeLists.txt
index d5f8a6f24ee..b3df0422acf 100644
--- a/llvm/lib/DebugInfo/DWARF/CMakeLists.txt
+++ b/llvm/lib/DebugInfo/DWARF/CMakeLists.txt
@@ -13,6 +13,7 @@ add_llvm_library(LLVMDebugInfoDWARF
   DWARFDebugRangeList.cpp
   DWARFFormValue.cpp
   DWARFTypeUnit.cpp
+  DWARFUnitIndex.cpp
   DWARFUnit.cpp
   SyntaxHighlighting.cpp
 
diff --git a/llvm/lib/DebugInfo/DWARF/DWARFContext.cpp b/llvm/lib/DebugInfo/DWARF/DWARFContext.cpp
index aecd991ff0d..7ece6787d07 100644
--- a/llvm/lib/DebugInfo/DWARF/DWARFContext.cpp
+++ b/llvm/lib/DebugInfo/DWARF/DWARFContext.cpp
@@ -12,6 +12,7 @@
 #include "llvm/ADT/StringSwitch.h"
 #include "llvm/DebugInfo/DWARF/DWARFAcceleratorTable.h"
 #include "llvm/DebugInfo/DWARF/DWARFDebugArangeSet.h"
+#include "llvm/DebugInfo/DWARF/DWARFUnitIndex.h"
 #include "llvm/Support/Compression.h"
 #include "llvm/Support/Dwarf.h"
 #include "llvm/Support/Format.h"
@@ -155,6 +156,14 @@ void DWARFContext::dump(raw_ostream &OS, DIDumpType DumpType) {
     }
   }
 
+  if (DumpType == DIDT_All || DumpType == DIDT_CUIndex) {
+    OS << "\n.debug_cu_index contents:\n";
+    DataExtractor CUIndexData(getCUIndexSection(), isLittleEndian(), savedAddressByteSize);
+    DWARFUnitIndex CUIndex;
+    CUIndex.parse(CUIndexData);
+    CUIndex.dump(OS);
+  }
+
   if (DumpType == DIDT_All || DumpType == DIDT_LineDwo) {
     OS << "\n.debug_line.dwo contents:\n";
     unsigned stmtOffset = 0;
@@ -608,6 +617,7 @@ DWARFContextInMemory::DWARFContextInMemory(const object::ObjectFile &Obj,
             .Case("apple_namespaces", &AppleNamespacesSection.Data)
             .Case("apple_namespac", &AppleNamespacesSection.Data)
             .Case("apple_objc", &AppleObjCSection.Data)
+            .Case("debug_cu_index", &CUIndexSection)
             // Any more debug info sections go here.
             .Default(nullptr);
     if (SectionData) {
diff --git a/llvm/lib/DebugInfo/DWARF/DWARFUnitIndex.cpp b/llvm/lib/DebugInfo/DWARF/DWARFUnitIndex.cpp
new file mode 100644
index 00000000000..5970fe03360
--- /dev/null
+++ b/llvm/lib/DebugInfo/DWARF/DWARFUnitIndex.cpp
@@ -0,0 +1,41 @@
+//===-- DWARFUnitIndex.cpp ------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/DebugInfo/DWARF/DWARFUnitIndex.h"
+
+namespace llvm {
+
+bool DWARFUnitIndex::Header::parse(DataExtractor IndexData, uint32_t *OffsetPtr) {
+  Version = IndexData.getU32(OffsetPtr);
+  NumColumns = IndexData.getU32(OffsetPtr);
+  NumUnits = IndexData.getU32(OffsetPtr);
+  NumBuckets = IndexData.getU32(OffsetPtr);
+  return Version <= 2;
+}
+
+void DWARFUnitIndex::Header::dump(raw_ostream &OS) const {
+  OS << "Index header:\n" << format("   version: %u\n", Version)
+     << format("   columns: %u\n", NumColumns)
+     << format("     units: %u\n", NumUnits)
+     << format("   buckets: %u\n", NumBuckets);
+}
+
+bool DWARFUnitIndex::parse(DataExtractor IndexData) {
+  uint32_t Offset = 0;
+  if (!Header.parse(IndexData, &Offset))
+    return false;
+
+  return true;
+}
+
+void DWARFUnitIndex::dump(raw_ostream &OS) const {
+  Header.dump(OS);
+}
+
+}