https://github.com/hbatagelo created https://github.com/llvm/llvm-project/pull/203794
Fixes #200879. This patch fixes crashes when code completion is invoked immediately after the declaration of a top-level class containing methods with default arguments or exception specifications. Default-argument case: https://godbolt.org/z/4G9nTfnGd Exception-specification case: https://godbolt.org/z/8frEv8von When code completion is triggered right after the class body, the lookahead token is `tok::code_completion` when late parsing begins. The token is saved to the cached token stream and `ConsumeAnyToken()` is called to consume it, but `ConsumeAnyToken()` defaults to rejecting completion tokens, which cuts off parsing. In the default-arguments path (as reported in #200879), the assertion `Tok.is(tok::equal) && "Default argument not starting with '='"` is triggered because `cutOffParsing()` sets the current token to `eof`. Fix by using `ConsumeAnyToken(/*ConsumeCodeCompletionTok=*/true)` when consuming the pushed token. >From 2b0992291c76e54a28eefc34c5235f33924f4427 Mon Sep 17 00:00:00 2001 From: Harlen Batagelo <[email protected]> Date: Sun, 14 Jun 2026 17:47:09 -0300 Subject: [PATCH] Fix parser crash on code completion in late-parsed methods --- clang/docs/ReleaseNotes.rst | 1 + clang/lib/Parse/ParseCXXInlineMethods.cpp | 4 ++-- clang/test/CodeCompletion/GH200879.cpp | 10 ++++++++++ 3 files changed, 13 insertions(+), 2 deletions(-) create mode 100644 clang/test/CodeCompletion/GH200879.cpp diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst index 7828135a6edbc..b90b0b24ef5e0 100644 --- a/clang/docs/ReleaseNotes.rst +++ b/clang/docs/ReleaseNotes.rst @@ -706,6 +706,7 @@ Bug Fixes in This Version - Clang no longer handles a `" q-char-sequence "` header name as a string literal (#GH132643). - Fixed an assertion when ``__attribute__((alloc_size))`` is used with an argument type wider than the target's pointer width. (#GH190445) - Fixed an assertion where we improperly handled implicit conversions to integral types from an atomic-type with a conversion function. (#GH201770) +- Fixed assertion failures involving code completion with delayed default arguments and exception specifications. (#GH200879) Bug Fixes to Compiler Builtins ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ diff --git a/clang/lib/Parse/ParseCXXInlineMethods.cpp b/clang/lib/Parse/ParseCXXInlineMethods.cpp index 6189c854e5fbf..24b6adc260a56 100644 --- a/clang/lib/Parse/ParseCXXInlineMethods.cpp +++ b/clang/lib/Parse/ParseCXXInlineMethods.cpp @@ -421,7 +421,7 @@ void Parser::ParseLexedMethodDeclaration(LateParsedMethodDeclaration &LM) { PP.EnterTokenStream(*Toks, true, /*IsReinject*/ true); // Consume the previously-pushed token. - ConsumeAnyToken(); + ConsumeAnyToken(/*ConsumeCodeCompletionTok=*/true); // Consume the '='. assert(Tok.is(tok::equal) && "Default argument not starting with '='"); @@ -501,7 +501,7 @@ void Parser::ParseLexedMethodDeclaration(LateParsedMethodDeclaration &LM) { PP.EnterTokenStream(*Toks, true, /*IsReinject*/true); // Consume the previously-pushed token. - ConsumeAnyToken(); + ConsumeAnyToken(/*ConsumeCodeCompletionTok=*/true); // C++11 [expr.prim.general]p3: // If a declaration declares a member function or member function diff --git a/clang/test/CodeCompletion/GH200879.cpp b/clang/test/CodeCompletion/GH200879.cpp new file mode 100644 index 0000000000000..62fa7cab03312 --- /dev/null +++ b/clang/test/CodeCompletion/GH200879.cpp @@ -0,0 +1,10 @@ +// RUN: %clang_cc1 -fsyntax-only -code-completion-at=%s:6:2 %s +// RUN: %clang_cc1 -fsyntax-only -code-completion-at=%s:10:2 %s + +struct A { + A(int = 0); +}/*invoke completion here*/; + +struct B { + B() noexcept(false); +}/*invoke completion here*/; \ No newline at end of file _______________________________________________ cfe-commits mailing list [email protected] https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
