Skip to content

[Clang] Fix a crash when parsing an invalid decltype #148798

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 2 commits into from
Jul 15, 2025
Merged

[Clang] Fix a crash when parsing an invalid decltype #148798

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
c80347a
[Clang] Fix a crash when parsing an invalid `decltype`
cor3ntin Jul 15, 2025
b8b2f25
turns out, we don't need this code at all
cor3ntin Jul 15, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
7 changes: 0 additions & 7 deletions clang/lib/Parse/ParseDeclCXX.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1133,13 +1133,6 @@ void Parser::AnnotateExistingDecltypeSpecifier(const DeclSpec &DS,
// make sure we have a token we can turn into an annotation token
if (PP.isBacktrackEnabled()) {
PP.RevertCachedTokens(1);
if (DS.getTypeSpecType() == TST_error) {
// We encountered an error in parsing 'decltype(...)' so lets annotate all
// the tokens in the backtracking cache - that we likely had to skip over
// to get to a token that allows us to resume parsing, such as a
// semi-colon.
EndLoc = PP.getLastCachedTokenLocation();
}
} else
PP.EnterToken(Tok, /*IsReinject*/ true);

Expand Down
6 changes: 6 additions & 0 deletions clang/test/Parser/gh114815.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,6 @@
// RUN: %clang_cc1 -verify %s -std=c++11 -fsyntax-only

#define ID(X) X
extern int ID(decltype);
// expected-error@-1 {{expected '(' after 'decltype'}} \
// expected-error@-1 {{expected unqualified-id}}