Add support to object files for accessing the .debug_types section

[clayborg]

Summary

In an effort to make the .debug_types patch smaller, breaking out the part that reads the .debug_types from object files into a separate patch.

[labath]

Thanks. Please also update the lit/Modules/elf-section-types.yaml test to include the new section type.

[clayborg]

Added lit test.

[clayborg]

BTW: I added the .debug_info verification to the lit test as there was a section made, but it wasn't checked.

[davide]

Thanks for taking the time to split this!

[clayborg]

Pavel, let me know if you are good with this.

[labath]

Looks great. Thanks.

include/lldb/lldb-enumerations.h

enum SectionType {
   eSectionTypeARMexidx,
   eSectionTypeARMextab,
   eSectionTypeCompactUnwind, // compact unwind section in Mach-O,
                              // __TEXT,__unwind_info
   eSectionTypeGoSymtab,
   eSectionTypeAbsoluteAddress, // Dummy section for symbols with absolute
                                // address
   eSectionTypeDWARFGNUDebugAltLink,
+  eSectionTypeDWARFDebugTypes, // DWARF .debug_types section
   eSectionTypeOther
 };
 
 FLAGS_ENUM(EmulateInstructionOptions){
     eEmulateInstructionOptionNone = (0u),
     eEmulateInstructionOptionAutoAdvancePC = (1u << 0),
     eEmulateInstructionOptionIgnoreConditions = (1u << 1)};
 

lit/Modules/elf-section-types.yaml

 # RUN: yaml2obj %s > %t
 # RUN: lldb-test module-sections %t | FileCheck %s
 
 # CHECK: Name: .text
 # CHECK-NEXT: Type: code
 
+# CHECK: Name: .debug_info
+# CHECK-NEXT: Type: dwarf-info
+# CHECK-NEXT: VM size: 0
+# CHECK-NEXT: File size: 8
+
+# CHECK: Name: .debug_types
+# CHECK-NEXT: Type: dwarf-types
+# CHECK-NEXT: VM size: 0
+# CHECK-NEXT: File size: 8
+
 # CHECK: Name: .gnu_debugaltlink
 # CHECK-NEXT: Type: dwarf-gnu-debugaltlink
 # CHECK-NEXT: VM size: 0
 # CHECK-NEXT: File size: 8
 
 # CHECK: Name: __codesection
 # CHECK-NEXT: Type: code
 
 --- !ELF
-FileHeader:      
+FileHeader:
   Class:           ELFCLASS64
   Data:            ELFDATA2LSB
   Type:            ET_DYN
   Machine:         EM_X86_64
   Entry:           0x00000000000007A0
-Sections:        
+Sections:
   - Name:            .text
     Type:            SHT_PROGBITS
     Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
     Content:         DEADBEEFBAADF00D
   - Name:            .debug_info
     Type:            SHT_PROGBITS
     AddressAlign:    0x0000000000000001
     Content:         DEADBEEFBAADF00D
+  - Name:            .debug_types
+    Type:            SHT_PROGBITS
+    AddressAlign:    0x0000000000000001
+    Content:         DEADBEEFBAADF00D
   - Name:            .gnu_debugaltlink
     Type:            SHT_PROGBITS
     AddressAlign:    0x0000000000000001
     Content:         DEADBEEFBAADF00D
   - Name:            __codesection
     Type:            SHT_PROGBITS
     Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
     Content:         DEADBEEFBAADF00D
 ...

source/Core/Section.cpp

const char *Section::GetTypeAsCString() const {
   case eSectionTypeDWARFDebugPubTypes:
     return "dwarf-pubtypes";
   case eSectionTypeDWARFDebugRanges:
     return "dwarf-ranges";
   case eSectionTypeDWARFDebugStr:
     return "dwarf-str";
   case eSectionTypeDWARFDebugStrOffsets:
     return "dwarf-str-offsets";
+  case eSectionTypeDWARFDebugTypes:
+    return "dwarf-types";
   case eSectionTypeELFSymbolTable:
     return "elf-symbol-table";
   case eSectionTypeELFDynamicSymbols:
     return "elf-dynamic-symbols";
   case eSectionTypeELFRelocationEntries:
     return "elf-relocation-entries";
   case eSectionTypeELFDynamicLinkInfo:
     return "elf-dynamic-link-info";

source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp

for (SectionHeaderCollIter I = m_section_headers.begin();
           ".debug_abbrev.dwo");
       static ConstString g_sect_name_dwarf_debug_info_dwo(".debug_info.dwo");
       static ConstString g_sect_name_dwarf_debug_line_dwo(".debug_line.dwo");
       static ConstString g_sect_name_dwarf_debug_macro_dwo(".debug_macro.dwo");
       static ConstString g_sect_name_dwarf_debug_loc_dwo(".debug_loc.dwo");
       static ConstString g_sect_name_dwarf_debug_str_dwo(".debug_str.dwo");
       static ConstString g_sect_name_dwarf_debug_str_offsets_dwo(
           ".debug_str_offsets.dwo");
+      static ConstString g_sect_name_dwarf_debug_types(".debug_types");
       static ConstString g_sect_name_eh_frame(".eh_frame");
       static ConstString g_sect_name_arm_exidx(".ARM.exidx");
       static ConstString g_sect_name_arm_extab(".ARM.extab");
       static ConstString g_sect_name_go_symtab(".gosymtab");
       static ConstString g_sect_name_dwarf_gnu_debugaltlink(".gnu_debugaltlink");
 
       SectionType sect_type = eSectionTypeOther;
 
for (SectionHeaderCollIter I = m_section_headers.begin();
       else if (name == g_sect_name_dwarf_debug_pubnames)
         sect_type = eSectionTypeDWARFDebugPubNames;
       else if (name == g_sect_name_dwarf_debug_pubtypes)
         sect_type = eSectionTypeDWARFDebugPubTypes;
       else if (name == g_sect_name_dwarf_debug_ranges)
         sect_type = eSectionTypeDWARFDebugRanges;
       else if (name == g_sect_name_dwarf_debug_str)
         sect_type = eSectionTypeDWARFDebugStr;
+      else if (name == g_sect_name_dwarf_debug_types)
+        sect_type = eSectionTypeDWARFDebugTypes;
       else if (name == g_sect_name_dwarf_debug_str_offsets)
         sect_type = eSectionTypeDWARFDebugStrOffsets;
       else if (name == g_sect_name_dwarf_debug_abbrev_dwo)
         sect_type = eSectionTypeDWARFDebugAbbrev;
       else if (name == g_sect_name_dwarf_debug_info_dwo)
         sect_type = eSectionTypeDWARFDebugInfo;
       else if (name == g_sect_name_dwarf_debug_line_dwo)
         sect_type = eSectionTypeDWARFDebugLine;

source/Plugins/ObjectFile/Mach-O/ObjectFileMachO.cpp

if (symbol) {
           case eSectionTypeDWARFDebugLoc:
           case eSectionTypeDWARFDebugMacInfo:
           case eSectionTypeDWARFDebugMacro:
           case eSectionTypeDWARFDebugPubNames:
           case eSectionTypeDWARFDebugPubTypes:
           case eSectionTypeDWARFDebugRanges:
           case eSectionTypeDWARFDebugStr:
           case eSectionTypeDWARFDebugStrOffsets:
+          case eSectionTypeDWARFDebugTypes:
           case eSectionTypeDWARFAppleNames:
           case eSectionTypeDWARFAppleTypes:
           case eSectionTypeDWARFAppleNamespaces:
           case eSectionTypeDWARFAppleObjC:
           case eSectionTypeDWARFGNUDebugAltLink:
             return eAddressClassDebug;
 
           case eSectionTypeEHFrame:
static lldb::SectionType GetSectionType(uint32_t flags,
   static ConstString g_sect_name_dwarf_debug_info("__debug_info");
   static ConstString g_sect_name_dwarf_debug_line("__debug_line");
   static ConstString g_sect_name_dwarf_debug_loc("__debug_loc");
   static ConstString g_sect_name_dwarf_debug_macinfo("__debug_macinfo");
   static ConstString g_sect_name_dwarf_debug_pubnames("__debug_pubnames");
   static ConstString g_sect_name_dwarf_debug_pubtypes("__debug_pubtypes");
   static ConstString g_sect_name_dwarf_debug_ranges("__debug_ranges");
   static ConstString g_sect_name_dwarf_debug_str("__debug_str");
+  static ConstString g_sect_name_dwarf_debug_types("__debug_types");
   static ConstString g_sect_name_dwarf_apple_names("__apple_names");
   static ConstString g_sect_name_dwarf_apple_types("__apple_types");
   static ConstString g_sect_name_dwarf_apple_namespaces("__apple_namespac");
   static ConstString g_sect_name_dwarf_apple_objc("__apple_objc");
   static ConstString g_sect_name_eh_frame("__eh_frame");
   static ConstString g_sect_name_compact_unwind("__unwind_info");
   static ConstString g_sect_name_text("__text");
   static ConstString g_sect_name_data("__data");
static lldb::SectionType GetSectionType(uint32_t flags,
   if (section_name == g_sect_name_dwarf_debug_pubnames)
     return eSectionTypeDWARFDebugPubNames;
   if (section_name == g_sect_name_dwarf_debug_pubtypes)
     return eSectionTypeDWARFDebugPubTypes;
   if (section_name == g_sect_name_dwarf_debug_ranges)
     return eSectionTypeDWARFDebugRanges;
   if (section_name == g_sect_name_dwarf_debug_str)
     return eSectionTypeDWARFDebugStr;
+  if (section_name == g_sect_name_dwarf_debug_types)
+    return eSectionTypeDWARFDebugTypes;
   if (section_name == g_sect_name_dwarf_apple_names)
     return eSectionTypeDWARFAppleNames;
   if (section_name == g_sect_name_dwarf_apple_types)
     return eSectionTypeDWARFAppleTypes;
   if (section_name == g_sect_name_dwarf_apple_namespaces)
     return eSectionTypeDWARFAppleNamespaces;
   if (section_name == g_sect_name_dwarf_apple_objc)
     return eSectionTypeDWARFAppleObjC;

source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.cpp

if (module_sp) {
         static ConstString g_sect_name_dwarf_debug_info(".debug_info");
         static ConstString g_sect_name_dwarf_debug_line(".debug_line");
         static ConstString g_sect_name_dwarf_debug_loc(".debug_loc");
         static ConstString g_sect_name_dwarf_debug_macinfo(".debug_macinfo");
         static ConstString g_sect_name_dwarf_debug_pubnames(".debug_pubnames");
         static ConstString g_sect_name_dwarf_debug_pubtypes(".debug_pubtypes");
         static ConstString g_sect_name_dwarf_debug_ranges(".debug_ranges");
         static ConstString g_sect_name_dwarf_debug_str(".debug_str");
+        static ConstString g_sect_name_dwarf_debug_types(".debug_types");
         static ConstString g_sect_name_eh_frame(".eh_frame");
         static ConstString g_sect_name_go_symtab(".gosymtab");
         SectionType section_type = eSectionTypeOther;
         if (m_sect_headers[idx].flags & llvm::COFF::IMAGE_SCN_CNT_CODE &&
             ((const_sect_name == g_code_sect_name) ||
              (const_sect_name == g_CODE_sect_name))) {
           section_type = eSectionTypeCode;
         } else if (m_sect_headers[idx].flags &
if (module_sp) {
         else if (const_sect_name == g_sect_name_dwarf_debug_pubnames)
           section_type = eSectionTypeDWARFDebugPubNames;
         else if (const_sect_name == g_sect_name_dwarf_debug_pubtypes)
           section_type = eSectionTypeDWARFDebugPubTypes;
         else if (const_sect_name == g_sect_name_dwarf_debug_ranges)
           section_type = eSectionTypeDWARFDebugRanges;
         else if (const_sect_name == g_sect_name_dwarf_debug_str)
           section_type = eSectionTypeDWARFDebugStr;
+        else if (const_sect_name == g_sect_name_dwarf_debug_types)
+          section_type = eSectionTypeDWARFDebugTypes;
         else if (const_sect_name == g_sect_name_eh_frame)
           section_type = eSectionTypeEHFrame;
         else if (const_sect_name == g_sect_name_go_symtab)
           section_type = eSectionTypeGoSymtab;
         else if (m_sect_headers[idx].flags & llvm::COFF::IMAGE_SCN_CNT_CODE) {
           section_type = eSectionTypeCode;
         } else if (m_sect_headers[idx].flags &
                    llvm::COFF::IMAGE_SCN_CNT_INITIALIZED_DATA) {

source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.h

public:
   const lldb_private::DWARFDataExtractor &get_debug_frame_data();
   const lldb_private::DWARFDataExtractor &get_debug_info_data();
   const lldb_private::DWARFDataExtractor &get_debug_line_data();
   const lldb_private::DWARFDataExtractor &get_debug_macro_data();
   const lldb_private::DWARFDataExtractor &get_debug_loc_data();
   const lldb_private::DWARFDataExtractor &get_debug_ranges_data();
   const lldb_private::DWARFDataExtractor &get_debug_str_data();
   const lldb_private::DWARFDataExtractor &get_debug_str_offsets_data();
+  const lldb_private::DWARFDataExtractor &get_debug_types_data();
   const lldb_private::DWARFDataExtractor &get_apple_names_data();
   const lldb_private::DWARFDataExtractor &get_apple_types_data();
   const lldb_private::DWARFDataExtractor &get_apple_namespaces_data();
   const lldb_private::DWARFDataExtractor &get_apple_objc_data();
   const lldb_private::DWARFDataExtractor &get_gnu_debugaltlink();
 
   DWARFDebugAbbrev *DebugAbbrev();
 
protected:
   DWARFDataSegment m_data_debug_frame;
   DWARFDataSegment m_data_debug_info;
   DWARFDataSegment m_data_debug_line;
   DWARFDataSegment m_data_debug_macro;
   DWARFDataSegment m_data_debug_loc;
   DWARFDataSegment m_data_debug_ranges;
   DWARFDataSegment m_data_debug_str;
   DWARFDataSegment m_data_debug_str_offsets;
+  DWARFDataSegment m_data_debug_types;
   DWARFDataSegment m_data_apple_names;
   DWARFDataSegment m_data_apple_types;
   DWARFDataSegment m_data_apple_namespaces;
   DWARFDataSegment m_data_apple_objc;
   DWARFDataSegment m_data_gnu_debugaltlink;
 
   // The unique pointer items below are generated on demand if and when someone
   // accesses

source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp

const DWARFDataExtractor &SymbolFileDWARF::get_debug_str_data() {
   return GetCachedSectionData(eSectionTypeDWARFDebugStr, m_data_debug_str);
 }
 
 const DWARFDataExtractor &SymbolFileDWARF::get_debug_str_offsets_data() {
   return GetCachedSectionData(eSectionTypeDWARFDebugStrOffsets,
                               m_data_debug_str_offsets);
 }
 
+const DWARFDataExtractor &SymbolFileDWARF::get_debug_types_data() {
+  return GetCachedSectionData(eSectionTypeDWARFDebugTypes, m_data_debug_types);
+}
+
 const DWARFDataExtractor &SymbolFileDWARF::get_apple_names_data() {
   return GetCachedSectionData(eSectionTypeDWARFAppleNames, m_data_apple_names);
 }
 
 const DWARFDataExtractor &SymbolFileDWARF::get_apple_types_data() {
   return GetCachedSectionData(eSectionTypeDWARFAppleTypes, m_data_apple_types);
 }
 

source/Symbol/ObjectFile.cpp

if (symbol) {
           case eSectionTypeDWARFDebugLoc:
           case eSectionTypeDWARFDebugMacInfo:
           case eSectionTypeDWARFDebugMacro:
           case eSectionTypeDWARFDebugPubNames:
           case eSectionTypeDWARFDebugPubTypes:
           case eSectionTypeDWARFDebugRanges:
           case eSectionTypeDWARFDebugStr:
           case eSectionTypeDWARFDebugStrOffsets:
+          case eSectionTypeDWARFDebugTypes:
           case eSectionTypeDWARFAppleNames:
           case eSectionTypeDWARFAppleTypes:
           case eSectionTypeDWARFAppleNamespaces:
           case eSectionTypeDWARFAppleObjC:
           case eSectionTypeDWARFGNUDebugAltLink:
             return eAddressClassDebug;
           case eSectionTypeEHFrame:
           case eSectionTypeARMexidx: