[PATCH] D145256: [clang/Diagnostic] Use `optional` to disambiguate between a `StoredDiagMessage` that is not set vs set as empty string

[Argyrios Kyrtzidis via Phabricator via cfe-commits]

akyrtzi updated this revision to Diff 502201.
akyrtzi added a comment.

Avoid passing a new `IgnoringDiagConsumer` for the test since it's unused.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D145256/new/

https://reviews.llvm.org/D145256

Files:
  clang/include/clang/Basic/Diagnostic.h
  clang/lib/Basic/Diagnostic.cpp
  clang/unittests/Basic/DiagnosticTest.cpp


Index: clang/unittests/Basic/DiagnosticTest.cpp
===================================================================
--- clang/unittests/Basic/DiagnosticTest.cpp
+++ clang/unittests/Basic/DiagnosticTest.cpp
@@ -9,6 +9,7 @@
 #include "clang/Basic/Diagnostic.h"
 #include "clang/Basic/DiagnosticError.h"
 #include "clang/Basic/DiagnosticIDs.h"
+#include "clang/Basic/DiagnosticLex.h"
 #include "gtest/gtest.h"
 #include <optional>
 
@@ -128,4 +129,26 @@
   EXPECT_EQ(*Value, std::make_pair(20, 1));
   EXPECT_EQ(Value->first, 20);
 }
+
+TEST(DiagnosticTest, storedDiagEmptyWarning) {
+  DiagnosticsEngine Diags(new DiagnosticIDs(), new DiagnosticOptions);
+
+  class CaptureDiagnosticConsumer : public DiagnosticConsumer {
+  public:
+    SmallVector<StoredDiagnostic> StoredDiags;
+
+    void HandleDiagnostic(DiagnosticsEngine::Level level,
+                          const Diagnostic &Info) override {
+      StoredDiags.push_back(StoredDiagnostic(level, Info));
+    }
+  };
+
+  CaptureDiagnosticConsumer CaptureConsumer;
+  Diags.setClient(&CaptureConsumer, /*ShouldOwnClient=*/false);
+  Diags.Report(diag::pp_hash_warning) << "";
+  ASSERT_TRUE(CaptureConsumer.StoredDiags.size() == 1);
+
+  // Make sure an empty warning can round-trip with \c StoredDiagnostic.
+  Diags.Report(CaptureConsumer.StoredDiags.front());
+}
 }
Index: clang/lib/Basic/Diagnostic.cpp
===================================================================
--- clang/lib/Basic/Diagnostic.cpp
+++ clang/lib/Basic/Diagnostic.cpp
@@ -793,8 +793,8 @@
 /// array.
 void Diagnostic::
 FormatDiagnostic(SmallVectorImpl<char> &OutStr) const {
-  if (!StoredDiagMessage.empty()) {
-    OutStr.append(StoredDiagMessage.begin(), StoredDiagMessage.end());
+  if (StoredDiagMessage.has_value()) {
+    OutStr.append(StoredDiagMessage->begin(), StoredDiagMessage->end());
     return;
   }
 
Index: clang/include/clang/Basic/Diagnostic.h
===================================================================
--- clang/include/clang/Basic/Diagnostic.h
+++ clang/include/clang/Basic/Diagnostic.h
@@ -1565,7 +1565,7 @@
 /// currently in-flight diagnostic.
 class Diagnostic {
   const DiagnosticsEngine *DiagObj;
-  StringRef StoredDiagMessage;
+  std::optional<StringRef> StoredDiagMessage;
 
 public:
   explicit Diagnostic(const DiagnosticsEngine *DO) : DiagObj(DO) {}


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