Improve DWARFDebugFrame::parse to also handle __eh_frame.

LLVM MC has single methods which can handle the output of EH frame and DWARF CIE's and FDE's.

This code improves DWARFDebugFrame::parse to do the same for parsing.

This also allows llvm-objdump to support the --dwarf=frames option which objdump supports.  This
option dumps the .eh_frame section using the new code in DWARFDebugFrame::parse.

http://reviews.llvm.org/D15535

Reviewed by Rafael Espindola.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@256008 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 17 insertions, 5 deletions

diff --git a/include/llvm/DebugInfo/DIContext.h b/include/llvm/DebugInfo/DIContext.h
index 6659a97a042..769c45d4b20 100644
--- a/include/llvm/DebugInfo/DIContext.h
+++ b/include/llvm/DebugInfo/DIContext.h
@@ -140,7 +140,8 @@ public:
   DIContext(DIContextKind K) : Kind(K) {}
   virtual ~DIContext() {}
 
-  virtual void dump(raw_ostream &OS, DIDumpType DumpType = DIDT_All) = 0;
+  virtual void dump(raw_ostream &OS, DIDumpType DumpType = DIDT_All,
+                    bool DumpEH = false) = 0;
 
   virtual DILineInfo getLineInfoForAddress(uint64_t Address,
       DILineInfoSpecifier Specifier = DILineInfoSpecifier()) = 0;
diff --git a/include/llvm/DebugInfo/DWARF/DWARFContext.h b/include/llvm/DebugInfo/DWARF/DWARFContext.h
index ce253a05bf8..71d5f25a420 100644
--- a/include/llvm/DebugInfo/DWARF/DWARFContext.h
+++ b/include/llvm/DebugInfo/DWARF/DWARFContext.h
@@ -48,6 +48,7 @@ class DWARFContext : public DIContext {
   std::unique_ptr<DWARFDebugAranges> Aranges;
   std::unique_ptr<DWARFDebugLine> Line;
   std::unique_ptr<DWARFDebugFrame> DebugFrame;
+  std::unique_ptr<DWARFDebugFrame> EHFrame;
   std::unique_ptr<DWARFDebugMacro> Macro;
 
   DWARFUnitSection<DWARFCompileUnit> DWOCUs;
@@ -81,7 +82,8 @@ public:
     return DICtx->getKind() == CK_DWARF;
   }
 
-  void dump(raw_ostream &OS, DIDumpType DumpType = DIDT_All) override;
+  void dump(raw_ostream &OS, DIDumpType DumpType = DIDT_All,
+            bool DumpEH = false) override;
 
   typedef DWARFUnitSection<DWARFCompileUnit>::iterator_range cu_iterator_range;
   typedef DWARFUnitSection<DWARFTypeUnit>::iterator_range tu_iterator_range;
@@ -168,6 +170,9 @@ public:
   /// Get a pointer to the parsed frame information object.
   const DWARFDebugFrame *getDebugFrame();
 
+  /// Get a pointer to the parsed eh frame information object.
+  const DWARFDebugFrame *getEHFrame();
+
   /// Get a pointer to the parsed DebugMacro object.
   const DWARFDebugMacro *getDebugMacro();
 
@@ -191,6 +196,7 @@ public:
   virtual const DWARFSection &getLocSection() = 0;
   virtual StringRef getARangeSection() = 0;
   virtual StringRef getDebugFrameSection() = 0;
+  virtual StringRef getEHFrameSection() = 0;
   virtual const DWARFSection &getLineSection() = 0;
   virtual StringRef getStringSection() = 0;
   virtual StringRef getRangeSection() = 0;
@@ -242,6 +248,7 @@ class DWARFContextInMemory : public DWARFContext {
   DWARFSection LocSection;
   StringRef ARangeSection;
   StringRef DebugFrameSection;
+  StringRef EHFrameSection;
   DWARFSection LineSection;
   StringRef StringSection;
   StringRef RangeSection;
@@ -281,6 +288,7 @@ public:
   const DWARFSection &getLocSection() override { return LocSection; }
   StringRef getARangeSection() override { return ARangeSection; }
   StringRef getDebugFrameSection() override { return DebugFrameSection; }
+  StringRef getEHFrameSection() override { return EHFrameSection; }
   const DWARFSection &getLineSection() override { return LineSection; }
   StringRef getStringSection() override { return StringSection; }
   StringRef getRangeSection() override { return RangeSection; }
diff --git a/include/llvm/DebugInfo/DWARF/DWARFDebugFrame.h b/include/llvm/DebugInfo/DWARF/DWARFDebugFrame.h
index be925cbe751..cd76c909dda 100644
--- a/include/llvm/DebugInfo/DWARF/DWARFDebugFrame.h
+++ b/include/llvm/DebugInfo/DWARF/DWARFDebugFrame.h
@@ -19,11 +19,13 @@ namespace llvm {
 
 class FrameEntry;
 
-/// \brief A parsed .debug_frame section
+/// \brief A parsed .debug_frame or .eh_frame section
 ///
 class DWARFDebugFrame {
+  // True if this is parsing an eh_frame section.
+  bool IsEH;
 public:
-  DWARFDebugFrame();
+  DWARFDebugFrame(bool IsEH);
   ~DWARFDebugFrame();
 
   /// \brief Dump the section data into the given stream.
diff --git a/include/llvm/DebugInfo/PDB/PDBContext.h b/include/llvm/DebugInfo/PDB/PDBContext.h
index 9404a592244..2034e3b004b 100644
--- a/include/llvm/DebugInfo/PDB/PDBContext.h
+++ b/include/llvm/DebugInfo/PDB/PDBContext.h
@@ -38,7 +38,8 @@ public:
     return DICtx->getKind() == CK_PDB;
   }
 
-  void dump(raw_ostream &OS, DIDumpType DumpType = DIDT_All) override;
+  void dump(raw_ostream &OS, DIDumpType DumpType = DIDT_All,
+            bool DumpEH = false) override;
 
   DILineInfo getLineInfoForAddress(
       uint64_t Address,