Skip to content
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

Jump to bottom

[clang] [C23] Fix crash with _BitInt running clang-tidy #65889

Merged
merged 1 commit into from
Sep 20, 2023
Merged

[clang] [C23] Fix crash with _BitInt running clang-tidy #65889

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
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
9 changes: 9 additions & 0 deletions clang-tools-extra/test/clang-tidy/checkers/bugprone/inc-dec-in-conditions-bitint-no-crash.c
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,9 @@
// RUN: %check_clang_tidy %s bugprone-inc-dec-in-conditions %t

_BitInt(8) v_401_0() {
0 && ({
_BitInt(5) y = 0;
16777215wb ?: ++y;
});
}
// CHECK-MESSAGES: warning
2 changes: 1 addition & 1 deletion clang/include/clang/AST/Type.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -6642,7 +6642,7 @@ class BitIntType final : public Type, public llvm::FoldingSetNode {
bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

void Profile(llvm::FoldingSetNodeID &ID) {
void Profile(llvm::FoldingSetNodeID &ID) const {
Profile(ID, isUnsigned(), getNumBits());
}

Expand Down
8 changes: 7 additions & 1 deletion clang/lib/AST/StmtProfile.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1333,7 +1333,13 @@ void StmtProfiler::VisitPredefinedExpr(const PredefinedExpr *S) {
void StmtProfiler::VisitIntegerLiteral(const IntegerLiteral *S) {
VisitExpr(S);
S->getValue().Profile(ID);
ID.AddInteger(S->getType()->castAs<BuiltinType>()->getKind());

QualType T = S->getType();
ID.AddInteger(T->getTypeClass());
Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

This addition of the type class doesn't observe the Canonical attribute, leading to IntegerLiterals with different types but same canonical types mismatching even when Canonical is true.

Copy link
Collaborator

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Oooh, good catch! Thanks for that! Can you contribute a patch to fix that? (That is, canonicalize T).

Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Sure thing. I haven't been able to find a reproducer for upstream clang, so I don't have a test case, but it doesn't seem to break any tests at least. Waiting for it to push to github now.

if (auto BitIntT = T->getAs<BitIntType>())
BitIntT->Profile(ID);
else
ID.AddInteger(T->castAs<BuiltinType>()->getKind());
}

void StmtProfiler::VisitFixedPointLiteral(const FixedPointLiteral *S) {
Expand Down