[flang-commits] [flang] [flang] Represent use statement in fir. (PR #168106)

[Kareem Ergawy via flang-commits]

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@@ -222,6 +222,75 @@ static mlir::FlatSymbolRefAttr gatherComponentInit(
   return mlir::FlatSymbolRefAttr::get(mlirContext, name);
 }
 
+/// Emit fir.use_stmt operations for USE statements in the given scope
+static void
+emitUseStatementsFromScope(Fortran::lower::AbstractConverter &converter,
+                           mlir::OpBuilder &builder, mlir::Location loc,
+                           const Fortran::semantics::Scope &scope) {
+  mlir::MLIRContext *context = builder.getContext();
+
+  for (const auto &preservedStmt : scope.preservedUseStmts()) {
+
+    auto getMangledName = [&](const std::string &localName) -> std::string {
+      Fortran::parser::CharBlock charBlock{localName.data(), localName.size()};
+      const auto *sym = scope.FindSymbol(charBlock);
+      if (!sym)
+        return "";
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ergawy wrote:

Sorry for missing this first time, can explain why in this and below cases it's fine to return an empty string rather than emitting a todo, error, or some kind of warning?

https://github.com/llvm/llvm-project/pull/168106