Handle new format of "Source Lang Literal" metadata

Handle new format of "Source Lang Literal" metadata

Author: mateuszchudyk

IGC/DebugInfo/Utils.hpp

@@ -36,8 +36,17 @@ static void OrderedTraversal(const ContainerType &Data, BinaryFunction Visit,
 
 constexpr int32_t SOURCE_LANG_LITERAL_MD_IS_NOT_PRESENT = -1;
 
-inline int32_t getSourceLangLiteralMDValue(const llvm::Module &module) {
-  auto sourceLangLiteral = module.getModuleFlag("Source Lang Literal");
+//
+// Flag "Source Lang Literal" contains sourceLanguage.
+//
+// Example:
+//   !llvm.module.flags = !{..., !3, ...}
+//   ...
+//   !3 = !{i32 2, !"Source Lang Literal", 33}
+//   ...
+//
+inline int32_t getSourceLangLiteralMDValueLegacy(const llvm::Module *module) {
+  auto sourceLangLiteral = module->getModuleFlag("Source Lang Literal");
   if (!sourceLangLiteral) {
     return SOURCE_LANG_LITERAL_MD_IS_NOT_PRESENT;
   }
@@ -47,9 +56,52 @@ inline int32_t getSourceLangLiteralMDValue(const llvm::Module &module) {
       llvm::cast<llvm::ConstantInt>(constant->getValue())->getZExtValue());
 }
 
-inline uint16_t getSourceLanguage(llvm::DICompileUnit *compileUnit,
+//
+// Flag "Source Lang Literal" contains a list (MDTuple) of pairs (MDTuple):
+//   (compileUnit, sourceLanguage)
+//
+// Example:
+//   !llvm.module.flags = !{..., !3, ...}
+//   ...
+//   !3 = !{i32 2, !"Source Lang Literal", !4}
+//   !4 = !{!5, !1834, ...}
+//   !5 = !{!6, i32 33}
+//   !6 = !DICompileUnit(...
+//   ...
+//   !1834 = !{!1835, i32 33}
+//   !1835 = !DICompileUnit(...
+//   ...
+//
+inline int32_t
+getSourceLangLiteralMDValue(const llvm::DICompileUnit *compileUnit,
+                            const llvm::Module *module) {
+  const auto flagName = "Source Lang Literal";
+
+  if (!module->getModuleFlag(flagName)) {
+    return SOURCE_LANG_LITERAL_MD_IS_NOT_PRESENT;
+  }
+
+  auto node = llvm::dyn_cast<llvm::MDTuple>(module->getModuleFlag(flagName));
+  if (!node) {
+    return getSourceLangLiteralMDValueLegacy(module);
+  }
+
+  for (auto &op : node->operands()) {
+    auto entry = llvm::cast<llvm::MDTuple>(op);
+    if (llvm::cast<llvm::DICompileUnit>(entry->getOperand(0)) == compileUnit) {
+      auto constant =
+          llvm::cast<llvm::ConstantAsMetadata>(entry->getOperand(1));
+      return int32_t(
+          llvm::cast<llvm::ConstantInt>(constant->getValue())->getZExtValue());
+    }
+  }
+
+  return SOURCE_LANG_LITERAL_MD_IS_NOT_PRESENT;
+}
+
+inline uint16_t getSourceLanguage(const llvm::DICompileUnit *compileUnit,
                                   const llvm::Module *module) {
-  int32_t sourceLanguage = getSourceLangLiteralMDValue(*module);
+  int32_t sourceLanguage = getSourceLangLiteralMDValue(compileUnit, module);
   if (sourceLanguage == SOURCE_LANG_LITERAL_MD_IS_NOT_PRESENT) {
     sourceLanguage = compileUnit->getSourceLanguage();
   }