[Concepts] Concept Specialization Expressions
Part of C++20 Concepts implementation effort. Added Concept Specialization Expressions that are created when a concept is refe$
D41217 on Phabricator.
(recommit after fixing failing Parser test on windows)
llvm-svn: 374903
diff --git a/clang/lib/Sema/SemaTemplateInstantiate.cpp b/clang/lib/Sema/SemaTemplateInstantiate.cpp
index 9091bc5..42411c9 100644
--- a/clang/lib/Sema/SemaTemplateInstantiate.cpp
+++ b/clang/lib/Sema/SemaTemplateInstantiate.cpp
@@ -198,12 +198,14 @@
case ExplicitTemplateArgumentSubstitution:
case DeducedTemplateArgumentSubstitution:
case PriorTemplateArgumentSubstitution:
+ case ConstraintsCheck:
return true;
case DefaultTemplateArgumentChecking:
case DeclaringSpecialMember:
case DefiningSynthesizedFunction:
case ExceptionSpecEvaluation:
+ case ConstraintSubstitution:
return false;
// This function should never be called when Kind's value is Memoization.
@@ -358,6 +360,24 @@
PointOfInstantiation, InstantiationRange, Param, Template,
TemplateArgs) {}
+Sema::InstantiatingTemplate::InstantiatingTemplate(
+ Sema &SemaRef, SourceLocation PointOfInstantiation,
+ ConstraintsCheck, TemplateDecl *Template,
+ ArrayRef<TemplateArgument> TemplateArgs, SourceRange InstantiationRange)
+ : InstantiatingTemplate(
+ SemaRef, CodeSynthesisContext::ConstraintsCheck,
+ PointOfInstantiation, InstantiationRange, Template, nullptr,
+ TemplateArgs) {}
+
+Sema::InstantiatingTemplate::InstantiatingTemplate(
+ Sema &SemaRef, SourceLocation PointOfInstantiation,
+ ConstraintSubstitution, TemplateDecl *Template,
+ sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
+ : InstantiatingTemplate(
+ SemaRef, CodeSynthesisContext::ConstraintSubstitution,
+ PointOfInstantiation, InstantiationRange, Template, nullptr,
+ {}, &DeductionInfo) {}
+
void Sema::pushCodeSynthesisContext(CodeSynthesisContext Ctx) {
Ctx.SavedInNonInstantiationSFINAEContext = InNonInstantiationSFINAEContext;
InNonInstantiationSFINAEContext = false;
@@ -664,6 +684,30 @@
case CodeSynthesisContext::Memoization:
break;
+
+ case CodeSynthesisContext::ConstraintsCheck:
+ if (auto *CD = dyn_cast<ConceptDecl>(Active->Entity)) {
+ SmallVector<char, 128> TemplateArgsStr;
+ llvm::raw_svector_ostream OS(TemplateArgsStr);
+ CD->printName(OS);
+ printTemplateArgumentList(OS, Active->template_arguments(),
+ getPrintingPolicy());
+ Diags.Report(Active->PointOfInstantiation,
+ diag::note_concept_specialization_here)
+ << OS.str()
+ << Active->InstantiationRange;
+ break;
+ }
+ // TODO: Concepts - implement this for constrained templates and partial
+ // specializations.
+ llvm_unreachable("only concept constraints are supported right now");
+ break;
+
+ case CodeSynthesisContext::ConstraintSubstitution:
+ Diags.Report(Active->PointOfInstantiation,
+ diag::note_constraint_substitution_here)
+ << Active->InstantiationRange;
+ break;
}
}
}
@@ -687,6 +731,7 @@
LLVM_FALLTHROUGH;
case CodeSynthesisContext::DefaultFunctionArgumentInstantiation:
case CodeSynthesisContext::ExceptionSpecInstantiation:
+ case CodeSynthesisContext::ConstraintsCheck:
// This is a template instantiation, so there is no SFINAE.
return None;
@@ -700,8 +745,10 @@
case CodeSynthesisContext::ExplicitTemplateArgumentSubstitution:
case CodeSynthesisContext::DeducedTemplateArgumentSubstitution:
- // We're either substitution explicitly-specified template arguments
- // or deduced template arguments, so SFINAE applies.
+ case CodeSynthesisContext::ConstraintSubstitution:
+ // We're either substituting explicitly-specified template arguments
+ // or deduced template arguments or a constraint expression, so SFINAE
+ // applies.
assert(Active->DeductionInfo && "Missing deduction info pointer");
return Active->DeductionInfo;