[lld] r305933 - [PDB] Add symbols to the PDB

Reid Kleckner via llvm-commits llvm-commits at lists.llvm.org
Wed Jun 21 10:25:56 PDT 2017


Author: rnk
Date: Wed Jun 21 12:25:56 2017
New Revision: 305933

URL: http://llvm.org/viewvc/llvm-project?rev=305933&view=rev
Log:
[PDB] Add symbols to the PDB

Summary:
The main complexity in adding symbol records is that we need to
"relocate" all the type indices. Type indices do not have anything like
relocations, an opaque data structure describing where to find existing
type indices for fixups. The linker just has to "know" where the type
references are in the symbol records. I added an overload of
`discoverTypeIndices` that works on symbol records, and it seems to be
able to link the standard library.

Reviewers: zturner, ruiu

Subscribers: llvm-commits, hiraditya

Differential Revision: https://reviews.llvm.org/D34432

Added:
    lld/trunk/test/COFF/pdb-symbol-types.yaml
Modified:
    lld/trunk/COFF/PDB.cpp
    lld/trunk/test/COFF/pdb-comdat.test

Modified: lld/trunk/COFF/PDB.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/COFF/PDB.cpp?rev=305933&r1=305932&r2=305933&view=diff
==============================================================================
--- lld/trunk/COFF/PDB.cpp (original)
+++ lld/trunk/COFF/PDB.cpp Wed Jun 21 12:25:56 2017
@@ -18,8 +18,8 @@
 #include "llvm/DebugInfo/CodeView/DebugSubsectionRecord.h"
 #include "llvm/DebugInfo/CodeView/DebugSubsectionVisitor.h"
 #include "llvm/DebugInfo/CodeView/LazyRandomTypeCollection.h"
-#include "llvm/DebugInfo/CodeView/SymbolDumper.h"
 #include "llvm/DebugInfo/CodeView/TypeDumpVisitor.h"
+#include "llvm/DebugInfo/CodeView/TypeIndexDiscovery.h"
 #include "llvm/DebugInfo/CodeView/TypeStreamMerger.h"
 #include "llvm/DebugInfo/CodeView/TypeTableBuilder.h"
 #include "llvm/DebugInfo/MSF/MSFBuilder.h"
@@ -115,6 +115,101 @@ static void mergeDebugT(ObjectFile *File
     fatal(Err, "codeview::mergeTypeStreams failed");
 }
 
+static bool remapTypeIndex(TypeIndex &TI, ArrayRef<TypeIndex> TypeIndexMap) {
+  if (TI.isSimple())
+    return true;
+  if (TI.toArrayIndex() >= TypeIndexMap.size())
+    return false;
+  TI = TypeIndexMap[TI.toArrayIndex()];
+  return true;
+}
+
+static bool remapTypesInSymbolRecord(ObjectFile *File,
+                                     MutableArrayRef<uint8_t> Contents,
+                                     ArrayRef<TypeIndex> TypeIndexMap,
+                                     ArrayRef<TiReference> TypeRefs) {
+  for (const TiReference &Ref : TypeRefs) {
+    unsigned ByteSize = Ref.Count * sizeof(TypeIndex);
+    if (Contents.size() < Ref.Offset + ByteSize) {
+      log("ignoring short symbol record");
+      return false;
+    }
+    MutableArrayRef<TypeIndex> TIs(
+        reinterpret_cast<TypeIndex *>(Contents.data() + Ref.Offset), Ref.Count);
+    for (TypeIndex &TI : TIs)
+      if (!remapTypeIndex(TI, TypeIndexMap)) {
+        log("ignoring symbol record in " + File->getName() +
+            " with bad type index 0x" + utohexstr(TI.getIndex()));
+        return false;
+      }
+  }
+  return true;
+}
+
+/// MSVC translates S_PROC_ID_END to S_END.
+uint16_t canonicalizeSymbolKind(SymbolKind Kind) {
+  if (Kind == SymbolKind::S_PROC_ID_END)
+    return SymbolKind::S_END;
+  return Kind;
+}
+
+/// Copy the symbol record. In a PDB, symbol records must be 4 byte aligned.
+/// The object file may not be aligned.
+static MutableArrayRef<uint8_t> copySymbolForPdb(const CVSymbol &Sym,
+                                                 BumpPtrAllocator &Alloc) {
+  size_t Size = alignTo(Sym.length(), alignOf(CodeViewContainer::Pdb));
+  assert(Size >= 4 && "record too short");
+  assert(Size <= MaxRecordLength && "record too long");
+  void *Mem = Alloc.Allocate(Size, 4);
+
+  // Copy the symbol record and zero out any padding bytes.
+  MutableArrayRef<uint8_t> NewData(reinterpret_cast<uint8_t *>(Mem), Size);
+  memcpy(NewData.data(), Sym.data().data(), Sym.length());
+  memset(NewData.data() + Sym.length(), 0, Size - Sym.length());
+
+  // Update the record prefix length. It should point to the beginning of the
+  // next record. MSVC does some canonicalization of the record kind, so we do
+  // that as well.
+  auto *Prefix = reinterpret_cast<RecordPrefix *>(Mem);
+  Prefix->RecordKind = canonicalizeSymbolKind(Sym.kind());
+  Prefix->RecordLen = Size - 2;
+  return NewData;
+}
+
+static void mergeSymbolRecords(BumpPtrAllocator &Alloc, ObjectFile *File,
+                               ArrayRef<TypeIndex> TypeIndexMap,
+                               BinaryStreamRef SymData) {
+  // FIXME: Improve error recovery by warning and skipping records when
+  // possible.
+  CVSymbolArray Syms;
+  BinaryStreamReader Reader(SymData);
+  ExitOnErr(Reader.readArray(Syms, Reader.getLength()));
+  for (const CVSymbol &Sym : Syms) {
+    // Discover type index references in the record. Skip it if we don't know
+    // where they are.
+    SmallVector<TiReference, 32> TypeRefs;
+    if (!discoverTypeIndices(Sym, TypeRefs)) {
+      log("ignoring unknown symbol record with kind 0x" + utohexstr(Sym.kind()));
+      continue;
+    }
+
+    // Copy the symbol record so we can mutate it.
+    MutableArrayRef<uint8_t> NewData = copySymbolForPdb(Sym, Alloc);
+
+    // Re-map all the type index references.
+    MutableArrayRef<uint8_t> Contents =
+        NewData.drop_front(sizeof(RecordPrefix));
+    if (!remapTypesInSymbolRecord(File, Contents, TypeIndexMap, TypeRefs))
+      continue;
+
+    // FIXME: Fill in "Parent" and "End" fields by maintaining a stack of
+    // scopes.
+
+    // Add the symbol to the module.
+    File->ModuleDBI->addSymbol(CVSymbol(Sym.kind(), NewData));
+  }
+}
+
 // Allocate memory for a .debug$S section and relocate it.
 static ArrayRef<uint8_t> relocateDebugChunk(BumpPtrAllocator &Alloc,
                                             SectionChunk *DebugChunk) {
@@ -191,6 +286,9 @@ static void addObjectsToPDB(BumpPtrAlloc
           // modification because the file checksum offsets will stay the same.
           File->ModuleDBI->addDebugSubsection(SS);
           break;
+        case DebugSubsectionKind::Symbols:
+          mergeSymbolRecords(Alloc, File, TypeIndexMap, SS.getRecordData());
+          break;
         default:
           // FIXME: Process the rest of the subsections.
           break;

Modified: lld/trunk/test/COFF/pdb-comdat.test
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/COFF/pdb-comdat.test?rev=305933&r1=305932&r2=305933&view=diff
==============================================================================
--- lld/trunk/test/COFF/pdb-comdat.test (original)
+++ lld/trunk/test/COFF/pdb-comdat.test Wed Jun 21 12:25:56 2017
@@ -26,7 +26,7 @@ RUN: rm -rf %t && mkdir -p %t && cd %t
 RUN: yaml2obj %S/Inputs/pdb_comdat_main.yaml -o pdb_comdat_main.obj
 RUN: yaml2obj %S/Inputs/pdb_comdat_bar.yaml -o pdb_comdat_bar.obj
 RUN: lld-link pdb_comdat_main.obj pdb_comdat_bar.obj -out:t.exe -debug -pdb:t.pdb -nodefaultlib -entry:main
-RUN: llvm-pdbutil raw -l t.pdb | FileCheck %s
+RUN: llvm-pdbutil raw -l -symbols t.pdb | FileCheck %s
 
 CHECK:                            Lines
 CHECK: ============================================================
@@ -38,6 +38,54 @@ CHECK:       c:\src\llvm-project\build\p
 CHECK-NOT:       c:\src\llvm-project\build\foo.h
 CHECK-LABEL:   Mod 0002 | `* Linker *`:
 
+CHECK:                           Symbols
+CHECK: ============================================================
+CHECK-LABEL:   Mod 0000 | `{{.*}}pdb_comdat_main.obj`:
+CHECK:   - S_OBJNAME [size = 56] sig=0, `C:\src\llvm-project\build\pdb_comdat_main.obj`
+CHECK:   - S_COMPILE3 [size = 60]
+CHECK:       machine = intel x86-x64, Ver = Microsoft (R) Optimizing Compiler, language = c
+CHECK:       frontend = 19.0.24215.1, backend = 19.0.24215.1
+CHECK:       flags = security checks | hot patchable
+CHECK:   - S_GPROC32_ID [size = 44] `main`
+    FIXME: We need to fill in "end".
+CHECK:       parent = 0, addr = 0002:0000, code size = 24, end = 0
+CHECK:       debug start = 4, debug end = 19, flags = none
+CHECK:   - S_FRAMEPROC [size = 32]
+CHECK:       size = 40, padding size = 0, offset to padding = 0
+CHECK:       bytes of callee saved registers = 0, exception handler addr = 0000:0000
+CHECK:       flags = has async eh | opt speed
+CHECK:   - S_END [size = 4]
+CHECK:   - S_GDATA32 [size = 24] `global`
+CHECK:       type = 0x0074 (int), addr = 0000:0000
+CHECK:   - S_BUILDINFO [size = 8] BuildId = `4106`
+CHECK:   - S_GPROC32_ID [size = 44] `foo`
+CHECK:       parent = 0, addr = 0002:0032, code size = 15, end = 0
+CHECK:       debug start = 0, debug end = 14, flags = none
+CHECK:   - S_FRAMEPROC [size = 32]
+CHECK:       size = 0, padding size = 0, offset to padding = 0
+CHECK:       bytes of callee saved registers = 0, exception handler addr = 0000:0000
+CHECK:       flags = marked inline | has async eh | opt speed
+CHECK:   - S_END [size = 4]
+CHECK-LABEL:   Mod 0001 | `{{.*}}pdb_comdat_bar.obj`:
+CHECK:   - S_OBJNAME [size = 56] sig=0, `C:\src\llvm-project\build\pdb_comdat_bar.obj`
+CHECK:   - S_COMPILE3 [size = 60]
+CHECK:       machine = intel x86-x64, Ver = Microsoft (R) Optimizing Compiler, language = c
+CHECK:       frontend = 19.0.24215.1, backend = 19.0.24215.1
+CHECK:       flags = security checks | hot patchable
+CHECK:   - S_GPROC32_ID [size = 44] `bar`
+CHECK:       parent = 0, addr = 0002:0048, code size = 14, end = 0
+CHECK:       debug start = 4, debug end = 9, flags = none
+CHECK:   - S_FRAMEPROC [size = 32]
+CHECK:       size = 40, padding size = 0, offset to padding = 0
+CHECK:       bytes of callee saved registers = 0, exception handler addr = 0000:0000
+CHECK:       flags = has async eh | opt speed
+CHECK:   - S_END [size = 4]
+CHECK:   - S_GDATA32 [size = 24] `global`
+CHECK:       type = 0x0074 (int), addr = 0000:0000
+CHECK:   - S_BUILDINFO [size = 8] BuildId = `4109`
+CHECK-NOT:   - S_GPROC32_ID {{.*}} `foo`
+CHECK-LABEL:   Mod 0002 | `* Linker *`:
+
 Reorder the object files and verify that the other table is selected.
 
 RUN: lld-link pdb_comdat_bar.obj pdb_comdat_main.obj -out:t.exe -debug -pdb:t.pdb -nodefaultlib -entry:main

Added: lld/trunk/test/COFF/pdb-symbol-types.yaml
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/COFF/pdb-symbol-types.yaml?rev=305933&view=auto
==============================================================================
--- lld/trunk/test/COFF/pdb-symbol-types.yaml (added)
+++ lld/trunk/test/COFF/pdb-symbol-types.yaml Wed Jun 21 12:25:56 2017
@@ -0,0 +1,344 @@
+# RUN: yaml2obj %s -o %t.obj
+# RUN: lld-link %t.obj -nodefaultlib -entry:main -debug -out:%t.exe -pdb:%t.pdb
+# RUN: llvm-pdbutil raw -symbols %t.pdb | FileCheck %s
+
+# To regenerate the object file:
+# $ cat symbol-types.c
+# struct Foo { int x; };
+# typedef struct Foo UDT_Foo;
+# UDT_Foo global_foo = {42};
+# int main() { return global_foo.x; }
+# $ cl -c -Z7 symbol-types.c
+
+# Note that the type of 'global' goes from 0x1005 in the object file to 0x1004
+# in the PDB because the LF_FUNC_ID is moved to the id stream.
+
+# CHECK:                           Symbols
+# CHECK: ============================================================
+# CHECK-LABEL:   Mod 0000 | `C:\src\llvm-project\build\tools\lld\test\COFF\Output\pdb-symbol-types.yaml.tmp.obj`:
+# CHECK:   - S_OBJNAME [size = 52] sig=0, `C:\src\llvm-project\build\symbol-types.obj`
+# CHECK:   - S_COMPILE3 [size = 60]
+# CHECK:       machine = intel x86-x64, Ver = Microsoft (R) Optimizing Compiler, language = c
+# CHECK:       frontend = 19.0.24215.1, backend = 19.0.24215.1
+# CHECK:       flags = security checks | hot patchable
+# CHECK:   - S_GPROC32_ID [size = 44] `main`
+# CHECK:       parent = 0, addr = 0002:0000, code size = 7, end = 0
+# CHECK:       debug start = 0, debug end = 6, flags = none
+# CHECK:   - S_FRAMEPROC [size = 32]
+# CHECK:       size = 0, padding size = 0, offset to padding = 0
+# CHECK:       bytes of callee saved registers = 0, exception handler addr = 0000:0000
+# CHECK:       flags = has async eh | opt speed
+# CHECK:   - S_END [size = 4]
+# CHECK:   - S_GDATA32 [size = 28] `global_foo`
+# CHECK:       type = 0x1004 (Foo), addr = 0001:0000
+# CHECK:   - S_UDT [size = 16] `UDT_Foo`
+# CHECK:       original type = 0x1004
+# CHECK:   - S_UDT [size = 12] `Foo`
+# CHECK:       original type = 0x1004
+# CHECK:   - S_BUILDINFO [size = 8] BuildId = `4106`
+# CHECK-LABEL:   Mod 0001 | `* Linker *`:
+
+--- !COFF
+header:          
+  Machine:         IMAGE_FILE_MACHINE_AMD64
+  Characteristics: [  ]
+sections:        
+  - Name:            .drectve
+    Characteristics: [ IMAGE_SCN_LNK_INFO, IMAGE_SCN_LNK_REMOVE ]
+    Alignment:       1
+    SectionData:     2020202F44454641554C544C49423A224C4942434D5422202F44454641554C544C49423A224F4C444E414D45532220
+  - Name:            '.debug$S'
+    Characteristics: [ IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_DISCARDABLE, IMAGE_SCN_MEM_READ ]
+    Alignment:       1
+    Subsections:     
+      - !Symbols
+        Records:         
+          - Kind:            S_OBJNAME
+            ObjNameSym:      
+              Signature:       0
+              ObjectName:      'C:\src\llvm-project\build\symbol-types.obj'
+          - Kind:            S_COMPILE3
+            Compile3Sym:     
+              Flags:           [ SecurityChecks, HotPatch ]
+              Machine:         X64
+              FrontendMajor:   19
+              FrontendMinor:   0
+              FrontendBuild:   24215
+              FrontendQFE:     1
+              BackendMajor:    19
+              BackendMinor:    0
+              BackendBuild:    24215
+              BackendQFE:      1
+              Version:         'Microsoft (R) Optimizing Compiler'
+      - !Symbols
+        Records:         
+          - Kind:            S_GPROC32_ID
+            ProcSym:         
+              CodeSize:        7
+              DbgStart:        0
+              DbgEnd:          6
+              FunctionType:    4098
+              Flags:           [  ]
+              DisplayName:     main
+          - Kind:            S_FRAMEPROC
+            FrameProcSym:    
+              TotalFrameBytes: 0
+              PaddingFrameBytes: 0
+              OffsetToPadding: 0
+              BytesOfCalleeSavedRegisters: 0
+              OffsetOfExceptionHandler: 0
+              SectionIdOfExceptionHandler: 0
+              Flags:           [ AsynchronousExceptionHandling, OptimizedForSpeed ]
+          - Kind:            S_PROC_ID_END
+            ScopeEndSym:     
+      - !Lines
+        CodeSize:        7
+        Flags:           [  ]
+        RelocOffset:     0
+        RelocSegment:    0
+        Blocks:          
+          - FileName:        'c:\src\llvm-project\build\symbol-types.c'
+            Lines:           
+              - Offset:          0
+                LineStart:       4
+                IsStatement:     true
+                EndDelta:        0
+              - Offset:          0
+                LineStart:       5
+                IsStatement:     true
+                EndDelta:        0
+              - Offset:          6
+                LineStart:       6
+                IsStatement:     true
+                EndDelta:        0
+            Columns:         
+      - !Symbols
+        Records:         
+          - Kind:            S_GDATA32
+            DataSym:         
+              Type:            4101
+              DisplayName:     global_foo
+          - Kind:            S_UDT
+            UDTSym:          
+              Type:            4101
+              UDTName:         UDT_Foo
+          - Kind:            S_UDT
+            UDTSym:          
+              Type:            4101
+              UDTName:         Foo
+      - !FileChecksums
+        Checksums:       
+          - FileName:        'c:\src\llvm-project\build\symbol-types.c'
+            Kind:            MD5
+            Checksum:        F833E1A4909FF6FEC5689A664F3BE725
+      - !StringTable
+        Strings:         
+          - 'c:\src\llvm-project\build\symbol-types.c'
+      - !Symbols
+        Records:         
+          - Kind:            S_BUILDINFO
+            BuildInfoSym:    
+              BuildId:         4111
+    Relocations:     
+      - VirtualAddress:  164
+        SymbolName:      main
+        Type:            IMAGE_REL_AMD64_SECREL
+      - VirtualAddress:  168
+        SymbolName:      main
+        Type:            IMAGE_REL_AMD64_SECTION
+      - VirtualAddress:  220
+        SymbolName:      main
+        Type:            IMAGE_REL_AMD64_SECREL
+      - VirtualAddress:  224
+        SymbolName:      main
+        Type:            IMAGE_REL_AMD64_SECTION
+      - VirtualAddress:  284
+        SymbolName:      global_foo
+        Type:            IMAGE_REL_AMD64_SECREL
+      - VirtualAddress:  288
+        SymbolName:      global_foo
+        Type:            IMAGE_REL_AMD64_SECTION
+  - Name:            '.debug$T'
+    Characteristics: [ IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_DISCARDABLE, IMAGE_SCN_MEM_READ ]
+    Alignment:       1
+    Types:           
+      - Kind:            LF_ARGLIST
+        ArgList:         
+          ArgIndices:      [ 0 ]
+      - Kind:            LF_PROCEDURE
+        Procedure:       
+          ReturnType:      116
+          CallConv:        NearC
+          Options:         [ None ]
+          ParameterCount:  0
+          ArgumentList:    4096
+      - Kind:            LF_FUNC_ID
+        FuncId:          
+          ParentScope:     0
+          FunctionType:    4097
+          Name:            main
+      - Kind:            LF_STRUCTURE
+        Class:           
+          MemberCount:     0
+          Options:         [ None, ForwardReference, HasUniqueName ]
+          FieldList:       0
+          Name:            Foo
+          UniqueName:      '.?AUFoo@@'
+          DerivationList:  0
+          VTableShape:     0
+          Size:            0
+      - Kind:            LF_FIELDLIST
+        FieldList:       
+          - Kind:            LF_MEMBER
+            DataMember:      
+              Attrs:           3
+              Type:            116
+              FieldOffset:     0
+              Name:            x
+      - Kind:            LF_STRUCTURE
+        Class:           
+          MemberCount:     1
+          Options:         [ None, HasUniqueName ]
+          FieldList:       4100
+          Name:            Foo
+          UniqueName:      '.?AUFoo@@'
+          DerivationList:  0
+          VTableShape:     0
+          Size:            4
+      - Kind:            LF_STRING_ID
+        StringId:        
+          Id:              0
+          String:          'c:\src\llvm-project\build\symbol-types.c'
+      - Kind:            LF_UDT_SRC_LINE
+        UdtSourceLine:   
+          UDT:             4101
+          SourceFile:      4102
+          LineNumber:      1
+      - Kind:            LF_STRING_ID
+        StringId:        
+          Id:              0
+          String:          'C:\src\llvm-project\build'
+      - Kind:            LF_STRING_ID
+        StringId:        
+          Id:              0
+          String:          'C:\PROGRA~2\MICROS~1.0\VC\Bin\amd64\cl.exe'
+      - Kind:            LF_STRING_ID
+        StringId:        
+          Id:              0
+          String:          '-c -Z7 -MT -IC:\PROGRA~2\MICROS~1.0\VC\include -IC:\PROGRA~2\MICROS~1.0\VC\atlmfc\include -IC:\PROGRA~2\WI3CF2~1\10\include\10.0.14393.0\ucrt -IC:\PROGRA~2\WI3CF2~1\10\include\10.0.14393.0\shared -IC:\PROGRA~2\WI3CF2~1\10\include\10.0.14393.0\um'
+      - Kind:            LF_SUBSTR_LIST
+        StringList:      
+          StringIndices:   [ 4106 ]
+      - Kind:            LF_STRING_ID
+        StringId:        
+          Id:              4107
+          String:          ' -IC:\PROGRA~2\WI3CF2~1\10\include\10.0.14393.0\winrt -TC -X'
+      - Kind:            LF_STRING_ID
+        StringId:        
+          Id:              0
+          String:          symbol-types.c
+      - Kind:            LF_STRING_ID
+        StringId:        
+          Id:              0
+          String:          'C:\src\llvm-project\build\vc140.pdb'
+      - Kind:            LF_BUILDINFO
+        BuildInfo:       
+          ArgIndices:      [ 4104, 4105, 4109, 4110, 4108 ]
+  - Name:            .data
+    Characteristics: [ IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ, IMAGE_SCN_MEM_WRITE ]
+    Alignment:       4
+    SectionData:     2A000000
+  - Name:            '.text$mn'
+    Characteristics: [ IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ ]
+    Alignment:       16
+    SectionData:     8B0500000000C3
+    Relocations:     
+      - VirtualAddress:  2
+        SymbolName:      global_foo
+        Type:            IMAGE_REL_AMD64_REL32
+symbols:         
+  - Name:            '@comp.id'
+    Value:           17063575
+    SectionNumber:   -1
+    SimpleType:      IMAGE_SYM_TYPE_NULL
+    ComplexType:     IMAGE_SYM_DTYPE_NULL
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+  - Name:            '@feat.00'
+    Value:           2147484048
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+    Value:           0
+    SectionNumber:   1
+    SimpleType:      IMAGE_SYM_TYPE_NULL
+    ComplexType:     IMAGE_SYM_DTYPE_NULL
+    StorageClass:    IMAGE_SYM_CLASS_STATIC
+    SectionDefinition: 
+      Length:          47
+      NumberOfRelocations: 0
+      NumberOfLinenumbers: 0
+      CheckSum:        0
+      Number:          0
+  - Name:            '.debug$S'
+    Value:           0
+    SectionNumber:   2
+    SimpleType:      IMAGE_SYM_TYPE_NULL
+    ComplexType:     IMAGE_SYM_DTYPE_NULL
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+      Length:          432
+      NumberOfRelocations: 6
+      NumberOfLinenumbers: 0
+      CheckSum:        0
+      Number:          0
+  - Name:            '.debug$T'
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+    SectionNumber:   3
+    SimpleType:      IMAGE_SYM_TYPE_NULL
+    ComplexType:     IMAGE_SYM_DTYPE_NULL
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+      Length:          732
+      NumberOfRelocations: 0
+      NumberOfLinenumbers: 0
+      CheckSum:        0
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+    Value:           0
+    SectionNumber:   4
+    SimpleType:      IMAGE_SYM_TYPE_NULL
+    ComplexType:     IMAGE_SYM_DTYPE_NULL
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+      Length:          4
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+      NumberOfLinenumbers: 0
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+      Number:          0
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+    Value:           0
+    SectionNumber:   4
+    SimpleType:      IMAGE_SYM_TYPE_NULL
+    ComplexType:     IMAGE_SYM_DTYPE_NULL
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+    Value:           0
+    SectionNumber:   5
+    SimpleType:      IMAGE_SYM_TYPE_NULL
+    ComplexType:     IMAGE_SYM_DTYPE_NULL
+    StorageClass:    IMAGE_SYM_CLASS_STATIC
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+      Length:          7
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+      NumberOfLinenumbers: 0
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+  - Name:            main
+    Value:           0
+    SectionNumber:   5
+    SimpleType:      IMAGE_SYM_TYPE_NULL
+    ComplexType:     IMAGE_SYM_DTYPE_FUNCTION
+    StorageClass:    IMAGE_SYM_CLASS_EXTERNAL
+...




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