https://github.com/HoBoIs updated
https://github.com/llvm/llvm-project/pull/66487
From 258462cc65403af147bb47cbeb95210df8e18cd3 Mon Sep 17 00:00:00 2001
From: hobois <horvath.botond.ist...@gmial.com>
Date: Fri, 15 Sep 2023 09:28:21 +0200
Subject: [PATCH] Choose the correct deduction guide
If there are two guides, one of them generated from a non-templated constructor
and the other from a templated constructor, then the standard gives priority to
the first. Clang detected ambiguity before, now the correct guide is chosen.
As an unrelated minor change, fix the issue #64020, which could've led to
incorrect behavior if further development inserted code after a call to
isAddressSpaceSubsetOf() which specified the two parameters in the wrong order.
---
clang/lib/Sema/SemaOverload.cpp | 17 ++++++++++++++++-
clang/lib/Sema/SemaTemplateInstantiateDecl.cpp | 2 +-
.../over.match.class.deduct/p2.cpp | 10 ++++++++++
3 files changed, 27 insertions(+), 2 deletions(-)
diff --git a/clang/lib/Sema/SemaOverload.cpp b/clang/lib/Sema/SemaOverload.cpp
index 45a9e5dc98c032d..1bb81238520173a 100644
--- a/clang/lib/Sema/SemaOverload.cpp
+++ b/clang/lib/Sema/SemaOverload.cpp
@@ -10153,6 +10153,21 @@ bool clang::isBetterOverloadCandidate(
// -- F1 is the copy deduction candidate(16.3.1.8) and F2 is not
if (Guide1->getDeductionCandidateKind() == DeductionCandidate::Copy)
return true;
+ if (Guide2->getDeductionCandidateKind() == DeductionCandidate::Copy)
+ return false;
+
+ // --F1 is generated from a non-template constructor and F2 is generated
+ // from a constructor template
+ const auto *Constructor1 = Guide1->getCorrespondingConstructor();
+ const auto *Constructor2 = Guide2->getCorrespondingConstructor();
+ if (Constructor1 && Constructor2) {
+ bool isC1Templated = Constructor1->getTemplatedKind() !=
+ FunctionDecl::TemplatedKind::TK_NonTemplate;
+ bool isC2Templated = Constructor2->getTemplatedKind() !=
+ FunctionDecl::TemplatedKind::TK_NonTemplate;
+ if (isC1Templated != isC2Templated)
+ return isC2Templated;
+ }
}
}
@@ -10196,7 +10211,7 @@ bool clang::isBetterOverloadCandidate(
if (AS1 != AS2) {
if (Qualifiers::isAddressSpaceSupersetOf(AS2, AS1))
return true;
- if (Qualifiers::isAddressSpaceSupersetOf(AS2, AS1))
+ if (Qualifiers::isAddressSpaceSupersetOf(AS1, AS2))
return false;
}
}
diff --git a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
index 9e5f85b0f9166bd..b9c4a9db842b9ee 100644
--- a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -2129,7 +2129,7 @@ Decl *TemplateDeclInstantiator::VisitFunctionDecl(
Function = CXXDeductionGuideDecl::Create(
SemaRef.Context, DC, D->getInnerLocStart(),
InstantiatedExplicitSpecifier, NameInfo, T, TInfo,
- D->getSourceRange().getEnd(), /*Ctor=*/nullptr,
+ D->getSourceRange().getEnd(), DGuide->getCorrespondingConstructor(),
DGuide->getDeductionCandidateKind());
Function->setAccess(D->getAccess());
} else {
diff --git
a/clang/test/CXX/over/over.match/over.match.funcs/over.match.class.deduct/p2.cpp
b/clang/test/CXX/over/over.match/over.match.funcs/over.match.class.deduct/p2.cpp
index 4eac0a1ac510f1d..d939d724dc7a0fd 100644
---
a/clang/test/CXX/over/over.match/over.match.funcs/over.match.class.deduct/p2.cpp
+++
b/clang/test/CXX/over/over.match/over.match.funcs/over.match.class.deduct/p2.cpp
@@ -85,3 +85,13 @@ int main() {
}
+
+namespace deduceTemplatedConstructor{
+template <class T> struct A {
+ A(T, T, int);
+ template<class U>
+ A(int, T, U);
+};
+
+A x(1, 2, 3); // no-error
+}
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