[PATCH] D85590: [clang][HeaderInsert] Do not treat defines with values as header guards

[Kadir Cetinkaya via Phabricator via cfe-commits]

kadircet created this revision.
kadircet added a reviewer: hokein.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.
kadircet requested review of this revision.

This was resulting in inserting headers at bogus locations, see
https://github.com/ycm-core/YouCompleteMe/issues/3736 for an example.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D85590

Files:
  clang/lib/Tooling/Inclusions/HeaderIncludes.cpp
  clang/unittests/Tooling/HeaderIncludesTest.cpp


Index: clang/unittests/Tooling/HeaderIncludesTest.cpp
===================================================================
--- clang/unittests/Tooling/HeaderIncludesTest.cpp
+++ clang/unittests/Tooling/HeaderIncludesTest.cpp
@@ -529,6 +529,18 @@
   EXPECT_EQ(Expected, remove(Code, "\"b.h\""));
 }
 
+TEST_F(HeaderIncludesTest, FakeHeaderGuardIfnDef) {
+  std::string Code = "#ifndef A_H\n"
+                     "#define A_H 1\n"
+                     "#endif";
+  std::string Expected = "#include \"b.h\"\n"
+                         "#ifndef A_H\n"
+                         "#define A_H 1\n"
+                         "#endif";
+
+  EXPECT_EQ(Expected, insert(Code, "\"b.h\""));
+}
+
 } // namespace
 } // namespace tooling
 } // namespace clang
Index: clang/lib/Tooling/Inclusions/HeaderIncludes.cpp
===================================================================
--- clang/lib/Tooling/Inclusions/HeaderIncludes.cpp
+++ clang/lib/Tooling/Inclusions/HeaderIncludes.cpp
@@ -100,7 +100,8 @@
           [](const SourceManager &SM, Lexer &Lex, Token Tok) -> unsigned {
             if (checkAndConsumeDirectiveWithName(Lex, "ifndef", Tok)) {
               skipComments(Lex, Tok);
-              if (checkAndConsumeDirectiveWithName(Lex, "define", Tok))
+              if (checkAndConsumeDirectiveWithName(Lex, "define", Tok) &&
+                  Tok.isAtStartOfLine())
                 return SM.getFileOffset(Tok.getLocation());
             }
             return 0;


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