[llvm] Add support for DebugLexicalBlock. (PR #217965)

[Juan Manuel Martinez Caamaño via llvm-commits]

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@@ -657,14 +682,65 @@ std::optional<MCRegister> SPIRVNonSemanticDebugHandler::resolveTypeScopeParent(
   if (const auto *Ty = dyn_cast_or_null<DIType>(Scope))
     return lookupOptReg(DebugTypeRegs, Ty);
 
-  // For a file, compile-unit, namespace, or absent scope, the parent is the
-  // first module DebugCompilationUnit.
+  // Find the DINamespace that was emitted as a lexical block.
+  if (isa_and_nonnull<DINamespace>(Scope))
+    return lookupOptReg(DebugLexicalBlockRegs, Scope);
+
+  // For a file, compile-unit, or absent scope, the parent is the first module
+  // DebugCompilationUnit.
   if (CompileUnits.empty())
     return std::nullopt;
 
   return lookupOptReg(CUToCompilationUnitDbgReg, CompileUnits[0].TheCU);
 }
 
+std::optional<MCRegister>
+SPIRVNonSemanticDebugHandler::resolveLexicalBlockParent(
+    const DIScope *Scope) const {
+  if (isa_and_nonnull<DILexicalBlock>(Scope) ||
+      isa_and_nonnull<DINamespace>(Scope))
+    return lookupOptReg(DebugLexicalBlockRegs, Scope);
+  if (const auto *SP = dyn_cast_or_null<DISubprogram>(Scope))
+    return lookupOptReg(DebugFunctionRegs, SP);
+  if (CompileUnits.empty())
+    return std::nullopt;
+  return lookupOptReg(CUToCompilationUnitDbgReg, CompileUnits[0].TheCU);
+}
+
+std::optional<MCRegister> SPIRVNonSemanticDebugHandler::emitDebugLexicalBlock(
+    const DIScope *S, MCRegister VoidTypeReg, MCRegister I32TypeReg,
+    MCRegister ExtInstSetReg, SPIRV::ModuleAnalysisInfo &MAI) {
+  assert((isa<DILexicalBlock>(S) || isa<DINamespace>(S)) &&
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jmmartinez wrote:

You could use the `isa<DILexicalBlock, DINamespace>` as you did above?

https://github.com/llvm/llvm-project/pull/217965