https://github.com/ahfakt created
https://github.com/llvm/llvm-project/pull/99859
Fix crash caused by template parameter pack expansion when no instantiation
exist.
From a84e2af497f827996afe9a820904f9f1d2f9fb22 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ahmet=20Faruk=20Akta=C5=9F?= <a.faruka...@outlook.com>
Date: Mon, 22 Jul 2024 13:28:01 +0300
Subject: [PATCH] Fix #99858
Fix crash caused by template parameter pack expansion when no instantiation
exist.
---
clang/lib/Sema/SemaTemplateVariadic.cpp | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/clang/lib/Sema/SemaTemplateVariadic.cpp
b/clang/lib/Sema/SemaTemplateVariadic.cpp
index 3d4ccaf68c700..70ceea1dda65b 100644
--- a/clang/lib/Sema/SemaTemplateVariadic.cpp
+++ b/clang/lib/Sema/SemaTemplateVariadic.cpp
@@ -732,7 +732,7 @@ bool Sema::CheckParameterPacksForExpansion(
llvm::PointerUnion<Decl *, DeclArgumentPack *> *Instantiation =
CurrentInstantiationScope->findInstantiationOf(
ParmPack.first.get<NamedDecl *>());
- if (Instantiation->is<DeclArgumentPack *>()) {
+ if (Instantiation && Instantiation->is<DeclArgumentPack *>()) {
// We could expand this function parameter pack.
NewPackSize = Instantiation->get<DeclArgumentPack *>()->size();
} else {
@@ -850,7 +850,7 @@ std::optional<unsigned> Sema::getNumArgumentsInExpansion(
llvm::PointerUnion<Decl *, DeclArgumentPack *> *Instantiation =
CurrentInstantiationScope->findInstantiationOf(
Unexpanded[I].first.get<NamedDecl *>());
- if (Instantiation->is<Decl *>())
+ if (Instantiation && Instantiation->is<Decl *>())
// The pattern refers to an unexpanded pack. We're not ready to
expand
// this pack yet.
return std::nullopt;
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