[DWARFYAML] Fix unintialized value Is64BitAddrSize. NFC.

This patch fixes the undefined behavior that reported by ubsan. http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-fast/builds/44524/
llvm · Aug 4, 2020 · 12605bf · 12605bf
1 parent 0de547e
commit 12605bf
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Showing 3 changed files with 8 additions and 3 deletions.
diff --git a/llvm/include/llvm/ObjectYAML/DWARFEmitter.h b/llvm/include/llvm/ObjectYAML/DWARFEmitter.h
@@ -48,7 +48,8 @@ std::function<Error(raw_ostream &, const Data &)>
 getDWARFEmitterByName(StringRef SecName);
 Expected<StringMap<std::unique_ptr<MemoryBuffer>>>
 emitDebugSections(StringRef YAMLString,
-                  bool IsLittleEndian = sys::IsLittleEndianHost);
+                  bool IsLittleEndian = sys::IsLittleEndianHost,
+                  bool Is64BitAddrSize = true);
 } // end namespace DWARFYAML
 } // end namespace llvm
 

diff --git a/llvm/lib/ObjectYAML/DWARFEmitter.cpp b/llvm/lib/ObjectYAML/DWARFEmitter.cpp
@@ -945,7 +945,8 @@ emitDebugSectionImpl(const DWARFYAML::Data &DI, StringRef Sec,
 }
 
 Expected<StringMap<std::unique_ptr<MemoryBuffer>>>
-DWARFYAML::emitDebugSections(StringRef YAMLString, bool IsLittleEndian) {
+DWARFYAML::emitDebugSections(StringRef YAMLString, bool IsLittleEndian,
+                             bool Is64BitAddrSize) {
   auto CollectDiagnostic = [](const SMDiagnostic &Diag, void *DiagContext) {
     *static_cast<SMDiagnostic *>(DiagContext) = Diag;
   };
@@ -956,6 +957,8 @@ DWARFYAML::emitDebugSections(StringRef YAMLString, bool IsLittleEndian) {
 
   DWARFYAML::Data DI;
   DI.IsLittleEndian = IsLittleEndian;
+  DI.Is64BitAddrSize = Is64BitAddrSize;
+
   YIn >> DI;
   if (YIn.error())
     return createStringError(YIn.error(), GeneratedDiag.getMessage());

diff --git a/llvm/unittests/DebugInfo/DWARF/DWARFDieTest.cpp b/llvm/unittests/DebugInfo/DWARF/DWARFDieTest.cpp
@@ -65,7 +65,8 @@ TEST(DWARFDie, getLocations) {
   )";
   Expected<StringMap<std::unique_ptr<MemoryBuffer>>> Sections =
       DWARFYAML::emitDebugSections(StringRef(yamldata),
-                                   /*IsLittleEndian=*/true);
+                                   /*IsLittleEndian=*/true,
+                                   /*Is64BitAddrSize=*/false);
   ASSERT_THAT_EXPECTED(Sections, Succeeded());
   std::unique_ptr<DWARFContext> Ctx =
       DWARFContext::create(*Sections, 4, /*isLittleEndian=*/true);