[PATCH] D134137: [clangd] Return earlier when snippet is empty

[Tom Praschan via Phabricator via cfe-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG60528c690a4c: [clangd] Return earlier when snippet is empty (authored by tom-anders).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D134137/new/

https://reviews.llvm.org/D134137

Files:
  clang-tools-extra/clangd/CodeComplete.cpp
  clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp


Index: clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp
===================================================================
--- clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp
+++ clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp
@@ -1014,6 +1014,23 @@
   EXPECT_THAT(Results.Completions, Not(Contains(labeled("clang::"))));
 }
 
+TEST(CompletionTests, EmptySnippetDoesNotCrash) {
+    // See https://github.com/clangd/clangd/issues/1216
+    auto Results = completions(R"cpp(
+        int main() {
+          auto w = [&](auto &&f) { return f(f); };
+          auto f = w([&](auto &&f) {
+            return [&](auto &&n) {
+              if (n == 0) {
+                return 1;
+              }
+              return n * ^(f)(n - 1);
+            };
+          })(10);
+        }
+    )cpp");
+}
+
 TEST(CompletionTest, BacktrackCrashes) {
   // Sema calls code completion callbacks twice in these cases.
   auto Results = completions(R"cpp(
Index: clang-tools-extra/clangd/CodeComplete.cpp
===================================================================
--- clang-tools-extra/clangd/CodeComplete.cpp
+++ clang-tools-extra/clangd/CodeComplete.cpp
@@ -491,6 +491,9 @@
       // we need to complete 'forward<$1>($0)'.
       return "($0)";
 
+    if (Snippet->empty())
+      return "";
+
     bool MayHaveArgList = Completion.Kind == CompletionItemKind::Function ||
                           Completion.Kind == CompletionItemKind::Method ||
                           Completion.Kind == CompletionItemKind::Constructor ||
@@ -529,8 +532,6 @@
       return *Snippet;
 
     // Replace argument snippets with a simplified pattern.
-    if (Snippet->empty())
-      return "";
     if (MayHaveArgList) {
       // Functions snippets can be of 2 types:
       // - containing only function arguments, e.g.


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D134137.461688.patch
Type: text/x-patch
Size: 1833 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/cfe-commits/attachments/20220920/6870737a/attachment.bin>