[PATCH] D131360: [clang-format] Fixes crash in QualifierOrder

[MyDeveloperDay via Phabricator via cfe-commits]

MyDeveloperDay created this revision.
MyDeveloperDay added reviewers: HazardyKnusperkeks, owenpan, curdeius.
MyDeveloperDay added a project: clang-format.
Herald added a project: All.
MyDeveloperDay requested review of this revision.

Prevent Null Token from causing a crash

Fixes: https://github.com/llvm/llvm-project/issues/56696


https://reviews.llvm.org/D131360

Files:
  clang/lib/Format/QualifierAlignmentFixer.cpp
  clang/unittests/Format/QualifierFixerTest.cpp


Index: clang/unittests/Format/QualifierFixerTest.cpp
===================================================================
--- clang/unittests/Format/QualifierFixerTest.cpp
+++ clang/unittests/Format/QualifierFixerTest.cpp
@@ -930,5 +930,15 @@
                "TemplateType<Container const> t;", Style);
 }
 
+TEST_F(QualifierFixerTest, ConstVolatile) {
+  FormatStyle Style = getLLVMStyle();
+  Style.QualifierAlignment = FormatStyle::QAS_Left;
+  Style.QualifierOrder = { "const", "volatile", "type" };
+
+  verifyFormat("bool empty() const volatile { return true; }",
+               "bool empty() const volatile { return true; }",
+               Style);
+}
+
 } // namespace format
 } // namespace clang
Index: clang/lib/Format/QualifierAlignmentFixer.cpp
===================================================================
--- clang/lib/Format/QualifierAlignmentFixer.cpp
+++ clang/lib/Format/QualifierAlignmentFixer.cpp
@@ -303,6 +303,9 @@
 
   if (LastQual && Qual != LastQual && Qual->is(QualifierType)) {
     rotateTokens(SourceMgr, Fixes, Tok, Qual, /*Left=*/true);
+    if (!Qual->Next) {
+      return Qual;
+    }
     Tok = Qual->Next;
   } else if (Tok->startsSequence(tok::identifier, QualifierType)) {
     if (Tok->Next->Next && Tok->Next->Next->isOneOf(tok::identifier, tok::star,
@@ -320,11 +323,11 @@
       Tok = Closer;
     }
   }
-  if (Tok->is(TT_TemplateOpener) && Tok->Next &&
+  if (Tok && Tok->is(TT_TemplateOpener) && Tok->Next &&
       (Tok->Next->is(tok::identifier) || Tok->Next->isSimpleTypeSpecifier()) &&
       Tok->Next->Next && Tok->Next->Next->is(QualifierType))
     rotateTokens(SourceMgr, Fixes, Tok->Next, Tok->Next->Next, /*Left=*/true);
-  if (Tok->startsSequence(tok::identifier) && Tok->Next) {
+  if (Tok && Tok->startsSequence(tok::identifier) && Tok->Next) {
     if (Tok->Previous &&
         Tok->Previous->isOneOf(tok::star, tok::ampamp, tok::amp))
       return Tok;


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