[PATCH] D52721: [Preprocessor] Fix a crash when handling non-alpha include header.

[Haojian Wu via Phabricator via cfe-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rC343481: [Preprocessor] Fix a crash when handling non-alpha include header. (authored by hokein, committed by ).

Changed prior to commit:
  https://reviews.llvm.org/D52721?vs=167737&id=167738#toc

Repository:
  rC Clang

https://reviews.llvm.org/D52721

Files:
  lib/Lex/PPDirectives.cpp
  test/Preprocessor/include-nonalpha-no-crash.c


Index: test/Preprocessor/include-nonalpha-no-crash.c
===================================================================
--- test/Preprocessor/include-nonalpha-no-crash.c
+++ test/Preprocessor/include-nonalpha-no-crash.c
@@ -0,0 +1,3 @@
+// RUN: %clang_cc1 %s -verify
+
+#include "./" // expected-error {{'./' file not found}}
Index: lib/Lex/PPDirectives.cpp
===================================================================
--- lib/Lex/PPDirectives.cpp
+++ lib/Lex/PPDirectives.cpp
@@ -1889,13 +1889,16 @@
       // characters
       StringRef OriginalFilename = Filename;
       if (!File) {
-        while (!isAlphanumeric(Filename.front())) {
-          Filename = Filename.drop_front();
-        }
-        while (!isAlphanumeric(Filename.back())) {
-          Filename = Filename.drop_back();
-        }
-
+        // A heuristic to correct a typo file name by removing leading and
+        // trailing non-isAlphanumeric characters.
+        auto CorrectTypoFilename = [](llvm::StringRef Filename) {
+          Filename = Filename.drop_until(isAlphanumeric);
+          while (!Filename.empty() && !isAlphanumeric(Filename.back())) {
+            Filename = Filename.drop_back();
+          }
+          return Filename;
+        };
+        Filename = CorrectTypoFilename(Filename);
         File = LookupFile(
             FilenameLoc,
             LangOpts.MSVCCompat ? NormalizedPath.c_str() : Filename, isAngled,


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