adamcz created this revision.
adamcz requested review of this revision.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.
We used to trigger assertion when transforming c-tor with unparsed
default argument. Now we ignore such constructors for this purpose.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D97965
Files:
clang/lib/Sema/SemaTemplate.cpp
clang/test/SemaCXX/cxx1z-class-template-argument-deduction.cpp
Index: clang/test/SemaCXX/cxx1z-class-template-argument-deduction.cpp
===================================================================
--- clang/test/SemaCXX/cxx1z-class-template-argument-deduction.cpp
+++ clang/test/SemaCXX/cxx1z-class-template-argument-deduction.cpp
@@ -416,6 +416,16 @@
}
+namespace no_crash_on_default_arg {
+class A {
+ template<typename T> class B {
+ B(int c = 1);
+ };
+ // This used to crash due to unparsed default arg above.
+ B(); // expected-error {{deduction guide declaration without trailing
return type}}
+};
+}
+
#pragma clang diagnostic push
#pragma clang diagnostic warning "-Wctad-maybe-unsupported"
namespace test_implicit_ctad_warning {
Index: clang/lib/Sema/SemaTemplate.cpp
===================================================================
--- clang/lib/Sema/SemaTemplate.cpp
+++ clang/lib/Sema/SemaTemplate.cpp
@@ -2494,6 +2494,12 @@
if (!CD || (!FTD && CD->isFunctionTemplateSpecialization()))
continue;
+ // Cannot make a deduction guide when unparsed arguments are present.
+ if (std::any_of(CD->param_begin(), CD->param_end(), [](ParmVarDecl *P) {
+ return !P || P->hasUnparsedDefaultArg();
+ }))
+ continue;
+
Transform.transformConstructor(FTD, CD);
AddedAny = true;
}
Index: clang/test/SemaCXX/cxx1z-class-template-argument-deduction.cpp
===================================================================
--- clang/test/SemaCXX/cxx1z-class-template-argument-deduction.cpp
+++ clang/test/SemaCXX/cxx1z-class-template-argument-deduction.cpp
@@ -416,6 +416,16 @@
}
+namespace no_crash_on_default_arg {
+class A {
+ template<typename T> class B {
+ B(int c = 1);
+ };
+ // This used to crash due to unparsed default arg above.
+ B(); // expected-error {{deduction guide declaration without trailing return type}}
+};
+}
+
#pragma clang diagnostic push
#pragma clang diagnostic warning "-Wctad-maybe-unsupported"
namespace test_implicit_ctad_warning {
Index: clang/lib/Sema/SemaTemplate.cpp
===================================================================
--- clang/lib/Sema/SemaTemplate.cpp
+++ clang/lib/Sema/SemaTemplate.cpp
@@ -2494,6 +2494,12 @@
if (!CD || (!FTD && CD->isFunctionTemplateSpecialization()))
continue;
+ // Cannot make a deduction guide when unparsed arguments are present.
+ if (std::any_of(CD->param_begin(), CD->param_end(), [](ParmVarDecl *P) {
+ return !P || P->hasUnparsedDefaultArg();
+ }))
+ continue;
+
Transform.transformConstructor(FTD, CD);
AddedAny = true;
}
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