[PATCH] D118844: [clang-format] Avoid adding space after the name of a function-like macro when the name is a keyword.

[Marek Kurdej via Phabricator via cfe-commits]

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

Fixes https://github.com/llvm/llvm-project/issues/31086.

Before the code:

  #define if(x)

was erroneously formatted to:

  #define if (x)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D118844

Files:
  clang/lib/Format/UnwrappedLineParser.cpp
  clang/unittests/Format/FormatTest.cpp


Index: clang/unittests/Format/FormatTest.cpp
===================================================================
--- clang/unittests/Format/FormatTest.cpp
+++ clang/unittests/Format/FormatTest.cpp
@@ -1795,6 +1795,18 @@
                AllowSimpleBracedStatements);
 }
 
+TEST_F(FormatTest, UnderstandsMacros) {
+  verifyFormat("#define A (parentheses)");
+  verifyFormat("#define true ((int)1)");
+  verifyFormat("#define and(x)");
+  verifyFormat("#define if(x) x");
+  verifyFormat("#define return(x) (x)");
+  verifyFormat("#define while(x) for (; x;)");
+  verifyFormat("#define xor(x) (^(x))");
+  verifyFormat("#define __except(x)");
+  verifyFormat("#define __try(x)");
+}
+
 TEST_F(FormatTest, ShortBlocksInMacrosDontMergeWithCodeAfterMacro) {
   FormatStyle Style = getLLVMStyleWithColumns(60);
   Style.AllowShortBlocksOnASingleLine = FormatStyle::SBS_Always;
Index: clang/lib/Format/UnwrappedLineParser.cpp
===================================================================
--- clang/lib/Format/UnwrappedLineParser.cpp
+++ clang/lib/Format/UnwrappedLineParser.cpp
@@ -1035,6 +1035,12 @@
     }
   }
 
+  // In the context of a define, even keywords should be treated as normal
+  // identifiers. Setting the kind to identifier is not enough, because we need
+  // to treat additional keywords like __except as well, which are already
+  // identifiers.
+  FormatTok->Tok.setKind(tok::identifier);
+  FormatTok->Tok.setIdentifierInfo(nullptr);
   nextToken();
   if (FormatTok->Tok.getKind() == tok::l_paren &&
       !FormatTok->hasWhitespaceBefore())


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