[clang] [CIR] Call code gen; create empty cir.func op (PR #113483)

[Schrodinger ZHU Yifan via cfe-commits]

SchrodingerZhu wrote:

Does https://mlir.llvm.org/docs/Dialects/Builtin/#fusedloc
suit the situation? 
On Thu, Oct 31, 2024 at 15:48, David Olsen ***@***.***> wrote:   @dkolsen-pgi commented on this pull request.  In clang/lib/CIR/CodeGen/CIRGenModule.cpp: > @@ -24,9 +27,140 @@ CIRGenModule::CIRGenModule(mlir::MLIRContext &context,
                            clang::ASTContext &astctx,
                            const clang::CodeGenOptions &cgo,
                            DiagnosticsEngine &diags)
-    : astCtx(astctx), langOpts(astctx.getLangOpts()),
-      theModule{mlir::ModuleOp::create(mlir::UnknownLoc())},
-      target(astCtx.getTargetInfo()) {}
+    : builder(&context), astCtx(astctx), langOpts(astctx.getLangOpts()),
+      theModule{mlir::ModuleOp::create(mlir::UnknownLoc::get(&context))},
+      diags(diags), target(astCtx.getTargetInfo()) {}
+
+mlir::Location CIRGenModule::getLoc(SourceLocation cLoc) {
+  assert(cLoc.isValid() && "expected valid source location");
+  const SourceManager &sm = astCtx.getSourceManager();
+  PresumedLoc pLoc = sm.getPresumedLoc(cLoc);
+  StringRef filename = pLoc.getFilename();
+  return mlir::FileLineColLoc::get(builder.getStringAttr(filename),
+                                   pLoc.getLine(), pLoc.getColumn());
+}
 I am guessing that the MLIR location type doesn't have any notion of multiple nested locations due to macro expansions. So we can't represent the full complexity of macros here. The outermost location seems like the right one to choose. (I am not familiar with either the Clang location type or the MLIR location type, so I welcome being corrected here.) —
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https://github.com/llvm/llvm-project/pull/113483