[PATCH] D53070: [CodeComplete] Fix crash when completing params function declarations.

[Sam McCall via Phabricator via cfe-commits]

sammccall created this revision.
sammccall added a reviewer: kadircet.
Herald added a subscriber: cfe-commits.

In a decl like `int AA(BB cc)` where BB isn't defined, we end up trying to
parse `BB cc` as an expression (vexing parse) and end up triggering the
parser's "recovery-in-function" completion with no actual function
scope.

This patch avoids the assumption that such a scope exists in this context.


Repository:
  rC Clang

https://reviews.llvm.org/D53070

Files:
  lib/Sema/SemaCodeComplete.cpp
  test/CodeCompletion/crash-func-decl.cpp


Index: test/CodeCompletion/crash-func-decl.cpp
===================================================================
--- /dev/null
+++ test/CodeCompletion/crash-func-decl.cpp
@@ -0,0 +1,5 @@
+// Important that BB is unknown.
+// This triggers completion in PCC_RecoveryInFunction context, with no function.
+int AA(BB cc);
+// RUN: not %clang_cc1 -fsyntax-only -code-completion-at=%s:3:12 %s | FileCheck %s
+// CHECK: COMPLETION: char
Index: lib/Sema/SemaCodeComplete.cpp
===================================================================
--- lib/Sema/SemaCodeComplete.cpp
+++ lib/Sema/SemaCodeComplete.cpp
@@ -1881,7 +1881,8 @@
     }
 
     // Switch-specific statements.
-    if (!SemaRef.getCurFunction()->SwitchStack.empty()) {
+    if (SemaRef.getCurFunction() &&
+        !SemaRef.getCurFunction()->SwitchStack.empty()) {
       // case expression:
       Builder.AddTypedTextChunk("case");
       Builder.AddChunk(CodeCompletionString::CK_HorizontalSpace);


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