[llvm-debuginfo-analyzer] Add support for parsing DWARF DW_TAG_module

Author: jalopezg-git

llvm/include/llvm/DebugInfo/LogicalView/Core/LVElement.h

@@ -48,6 +48,7 @@ enum class LVSubclassID : unsigned char {
   LV_SCOPE_NAMESPACE,
   LV_SCOPE_ROOT,
   LV_SCOPE_TEMPLATE_PACK,
+  LV_SCOPE_MODULE,
   LV_SCOPE_LAST,
   LV_SYMBOL_FIRST,
   LV_SYMBOL,

llvm/include/llvm/DebugInfo/LogicalView/Core/LVReader.h

@@ -107,6 +107,7 @@ class LVReader {
   LV_OBJECT_ALLOCATOR(ScopeNamespace)
   LV_OBJECT_ALLOCATOR(ScopeRoot)
   LV_OBJECT_ALLOCATOR(ScopeTemplatePack)
+  LV_OBJECT_ALLOCATOR(ScopeModule)
 
   // Symbols allocator.
   LV_OBJECT_ALLOCATOR(Symbol)
@@ -213,6 +214,7 @@ class LVReader {
   LV_CREATE_OBJECT(ScopeNamespace)
   LV_CREATE_OBJECT(ScopeRoot)
   LV_CREATE_OBJECT(ScopeTemplatePack)
+  LV_CREATE_OBJECT(ScopeModule)
 
   // Symbols creation.
   LV_CREATE_OBJECT(Symbol)

llvm/include/llvm/DebugInfo/LogicalView/Core/LVScope.h

@@ -57,6 +57,7 @@ enum class LVScopeKind {
   IsTemplatePack,
   IsTryBlock,
   IsUnion,
+  IsModule,
   LastEntry
 };
 using LVScopeKindSet = std::set<LVScopeKind>;
@@ -184,6 +185,7 @@ class LVScope : public LVElement {
   KIND(LVScopeKind, IsTemplatePack);
   KIND_1(LVScopeKind, IsTryBlock, IsBlock);
   KIND_1(LVScopeKind, IsUnion, IsAggregate);
+  KIND_3(LVScopeKind, IsModule, CanHaveRanges, CanHaveLines, TransformName);
 
   PROPERTY(Property, HasDiscriminator);
   PROPERTY(Property, CanHaveRanges);
@@ -838,6 +840,23 @@ class LVScopeTemplatePack final : public LVScope {
   void printExtra(raw_ostream &OS, bool Full = true) const override;
 };
 
+// Class to represent a DWARF Module.
+class LVScopeModule final : public LVScope {
+public:
+  LVScopeModule() : LVScope() {
+    setIsModule();
+    setIsLexicalBlock();
+  }
+  LVScopeModule(const LVScopeModule &) = delete;
+  LVScopeModule &operator=(const LVScopeModule &) = delete;
+  ~LVScopeModule() = default;
+
+  // Returns true if current scope is logically equal to the given 'Scope'.
+  bool equals(const LVScope *Scope) const override;
+
+  void printExtra(raw_ostream &OS, bool Full = true) const override;
+};
+
 } // end namespace logicalview
 } // end namespace llvm
 

llvm/lib/DebugInfo/LogicalView/Core/LVScope.cpp

@@ -40,6 +40,7 @@ const char *const KindTemplateAlias = "TemplateAlias";
 const char *const KindTemplatePack = "TemplatePack";
 const char *const KindUndefined = "Undefined";
 const char *const KindUnion = "Union";
+const char *const KindModule = "Module";
 } // end anonymous namespace
 
 //===----------------------------------------------------------------------===//
@@ -50,6 +51,8 @@ const char *LVScope::kind() const {
   const char *Kind = KindUndefined;
   if (getIsArray())
     Kind = KindArray;
+  else if (getIsModule())
+    Kind = KindModule;
   else if (getIsBlock())
     Kind = KindBlock;
   else if (getIsCallSite())
@@ -101,7 +104,8 @@ LVScopeDispatch LVScope::Dispatch = {
     {LVScopeKind::IsTemplateAlias, &LVScope::getIsTemplateAlias},
     {LVScopeKind::IsTemplatePack, &LVScope::getIsTemplatePack},
     {LVScopeKind::IsTryBlock, &LVScope::getIsTryBlock},
-    {LVScopeKind::IsUnion, &LVScope::getIsUnion}};
+    {LVScopeKind::IsUnion, &LVScope::getIsUnion},
+    {LVScopeKind::IsModule, &LVScope::getIsModule}};
 
 void LVScope::addToChildren(LVElement *Element) {
   if (!Children)
@@ -2116,3 +2120,15 @@ bool LVScopeTemplatePack::equals(const LVScope *Scope) const {
 void LVScopeTemplatePack::printExtra(raw_ostream &OS, bool Full) const {
   OS << formattedKind(kind()) << " " << formattedName(getName()) << "\n";
 }
+
+//===----------------------------------------------------------------------===//
+// DWARF module (DW_TAG_module).
+//===----------------------------------------------------------------------===//
+bool LVScopeModule::equals(const LVScope *Scope) const {
+  // For lexical blocks, LVScope::equals() compares the parent scope.
+  return LVScope::equals(Scope) && (Scope->getName() == getName());
+}
+
+void LVScopeModule::printExtra(raw_ostream &OS, bool Full) const {
+  OS << formattedKind(kind()) << " " << formattedName(getName()) << "\n";
+}

llvm/lib/DebugInfo/LogicalView/Readers/LVDWARFReader.cpp

@@ -233,6 +233,9 @@ LVElement *LVDWARFReader::createElement(dwarf::Tag Tag) {
   case dwarf::DW_TAG_GNU_template_parameter_pack:
     CurrentScope = createScopeTemplatePack();
     return CurrentScope;
+  case dwarf::DW_TAG_module:
+    CurrentScope = createScopeModule();
+    return CurrentScope;
   default:
     // Collect TAGs not implemented.
     if (options().getInternalTag() && Tag)

llvm/unittests/DebugInfo/LogicalView/DWARFReaderTest.cpp

@@ -33,6 +33,7 @@ const char *DwarfClang = "test-dwarf-clang.o";
 // Two compile units: one declares `extern int foo_printf(const char *, ...);`
 // and another one that defines the function.
 const char *DwarfClangUnspecParams = "test-dwarf-clang-unspec-params.elf";
+const char *DwarfClangModule = "test-dwarf-clang-module.o";
 const char *DwarfGcc = "test-dwarf-gcc.o";
 
 // Helper function to get the first compile unit.
@@ -162,6 +163,22 @@ void checkUnspecifiedParameters(LVReader *Reader) {
             true);
 }
 
+// Check the basic properties on parsed DW_TAG_module.
+void checkScopeModule(LVReader *Reader) {
+  LVScopeRoot *Root = Reader->getScopesRoot();
+  LVScopeCompileUnit *CompileUnit = getFirstCompileUnit(Root);
+
+  EXPECT_EQ(Root->getFileFormatName(), "Mach-O 64-bit x86-64");
+  EXPECT_EQ(Root->getName(), DwarfClangModule);
+
+  ASSERT_NE(CompileUnit->getChildren(), nullptr);
+  LVElement *FirstChild = *(CompileUnit->getChildren()->begin());
+  EXPECT_EQ(FirstChild->getIsScope(), 1);
+  LVScopeModule *Module = static_cast<LVScopeModule *>(FirstChild);
+  EXPECT_EQ(Module->getIsModule(), 1);
+  EXPECT_EQ(Module->getName(), "debugmodule");
+}
+
 // Check the logical elements selection.
 void checkElementSelection(LVReader *Reader) {
   LVScopeRoot *Root = Reader->getScopesRoot();
@@ -312,6 +329,9 @@ void elementProperties(SmallString<128> &InputsDir) {
 
   Reader = createReader(ReaderHandler, InputsDir, DwarfClangUnspecParams);
   checkUnspecifiedParameters(Reader.get());
+
+  Reader = createReader(ReaderHandler, InputsDir, DwarfClangModule);
+  checkScopeModule(Reader.get());
 }
 
 // Logical elements selection.