[PATCH] D41688: [Lex] Fix crash on code completion in comment in included file.

Volodymyr Sapsai via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Tue Jan 2 17:22:23 PST 2018

vsapsai created this revision.
vsapsai added reviewers: akyrtzi, doug.gregor.
Herald added subscribers: kbarton, nemanjai.

This fixes PR32732 by updating CurLexerKind to reflect available lexers.
We were hitting null pointer in Preprocessor::Lex because CurLexerKind
was CLK_Lexer but CurLexer was null. And we set it to null in
Preprocessor::HandleEndOfFile when exiting a file with code completion

To reproduce the crash it is important for a comment to be inside a
class specifier. In this case in Parser::ParseClassSpecifier we improve
error recovery by pushing a semicolon token back into the preprocessor
and later on try to lex a token because we haven't reached the end of

Also clang crashes only on code completion in included file, i.e. when
IncludeMacroStack is not empty. Though we reset CurLexer even if include
stack is empty. The difference is that during pushing back a semicolon
token, preprocessor calls EnterCachingLexMode which decides it is
already in caching mode because various lexers are null and
IncludeMacroStack is not empty. As the result, CurLexerKind remains
CLK_Lexer instead of updating to CLK_CachingLexer.




Index: clang/test/CodeCompletion/comments.cpp
--- /dev/null
+++ clang/test/CodeCompletion/comments.cpp
@@ -0,0 +1,13 @@
+// Note: the run lines follow their respective tests, since line/column
+// matter in this test.
+#include "comments.h"
+struct A {
+  // <- code completion
+  /* <- code completion */
+// RUN: %clang_cc1 -I %S/Inputs -fsyntax-only -code-completion-at=%s:7:6 %s
+// RUN: %clang_cc1 -I %S/Inputs -fsyntax-only -code-completion-at=%s:8:6 %s
+// RUN: %clang_cc1 -I %S/Inputs -fsyntax-only -code-completion-at=%S/Inputs/comments.h:3:6 %s
Index: clang/test/CodeCompletion/Inputs/comments.h
--- /dev/null
+++ clang/test/CodeCompletion/Inputs/comments.h
@@ -0,0 +1,4 @@
+// PR32732
+struct B {
+  // <- code completion
Index: clang/lib/Lex/PPLexerChange.cpp
--- clang/lib/Lex/PPLexerChange.cpp
+++ clang/lib/Lex/PPLexerChange.cpp
@@ -444,6 +444,7 @@
       CurPPLexer = nullptr;
+      recomputeCurLexerKind();
       return true;
Index: clang/lib/Lex/PPCaching.cpp
--- clang/lib/Lex/PPCaching.cpp
+++ clang/lib/Lex/PPCaching.cpp
@@ -105,8 +105,10 @@
 void Preprocessor::EnterCachingLexMode() {
-  if (InCachingLexMode())
+  if (InCachingLexMode()) {
+    assert(CurLexerKind == CLK_CachingLexer && "Unexpected lexer kind");
+  }
   CurLexerKind = CLK_CachingLexer;

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