llvmorg-github-actions[bot] wrote:

<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Younan Zhang (zyn0217)

<details>
<summary>Changes</summary>

We used to drop SFINAE errors that occurred during parameter mapping 
instantiation
on the floor, making our diagnostics worse for some cases.

This patch corrects that behavior. Moreover it fixes some clients where
the errors were not properly handled for invalid expressions.


---

Patch is 25.95 KiB, truncated to 20.00 KiB below, full version: 
https://github.com/llvm/llvm-project/pull/218618.diff


9 Files Affected:

- (modified) clang/lib/Sema/SemaConcept.cpp (+38-45) 
- (modified) clang/lib/Sema/SemaTemplateDeduction.cpp (+4-7) 
- (modified) clang/lib/Sema/TreeTransform.h (-4) 
- (modified) 
clang/test/CXX/temp/temp.constr/temp.constr.constr/non-function-templates.cpp 
(+2) 
- (modified) clang/test/SemaCXX/cxx23-assume.cpp (+1) 
- (modified) clang/test/SemaCXX/cxx2c-fold-exprs.cpp (+66-15) 
- (modified) clang/test/SemaTemplate/concepts.cpp (+4) 
- (modified) clang/test/SemaTemplate/cxx2a-constraint-exprs.cpp (+1) 
- (modified) clang/test/SemaTemplate/instantiate-requires-expr.cpp (+1) 


``````````diff
diff --git a/clang/lib/Sema/SemaConcept.cpp b/clang/lib/Sema/SemaConcept.cpp
index def80e274e10c..5c785d9129dda 100644
--- a/clang/lib/Sema/SemaConcept.cpp
+++ b/clang/lib/Sema/SemaConcept.cpp
@@ -269,6 +269,12 @@ class AdjustConstraints : public 
TreeTransform<AdjustConstraints> {
     return Result;
   }
 
+  QualType TransformPackIndexingType(TypeLocBuilder &TLB,
+                                     PackIndexingTypeLoc TL) {
+    llvm::SaveAndRestore _1(RemoveNonPackExpansionPacks, false);
+    return inherited::TransformPackIndexingType(TLB, TL);
+  }
+
   bool AlreadyTransformed(QualType T) {
     if (T.isNull())
       return true;
@@ -549,6 +555,31 @@ class ConstraintSatisfactionChecker {
                                         : PackSubstitutionIndex;
   }
 
+  StringRef allocateStringFromConceptDiagnostic(const PartialDiagnostic &Diag) 
{
+    SmallString<128> DiagString;
+    DiagString = ": ";
+    Diag.EmitToString(S.getDiagnostics(), DiagString);
+    return S.getASTContext().backupStr(DiagString);
+  }
+
+  void consumeSFINAEFailure(TemplateDeductionInfo &Info,
+                            ConstraintSatisfaction &Satisfaction) {
+    PartialDiagnosticAt SubstDiag{SourceLocation(),
+                                  PartialDiagnostic::NullDiagnostic()};
+    Info.takeSFINAEDiagnostic(SubstDiag);
+    // FIXME: This is an unfortunate consequence of there
+    //  being no serialization code for PartialDiagnostics and the fact
+    //  that serializing them would likely take a lot more storage than
+    //  just storing them as strings. We would still like, in the
+    //  future, to serialize the proper PartialDiagnostic as serializing
+    //  it as a string defeats the purpose of the diagnostic mechanism.
+    Satisfaction.Details.emplace_back(
+        new (S.Context) ConstraintSubstitutionDiagnostic{
+            SubstDiag.first,
+            allocateStringFromConceptDiagnostic(SubstDiag.second)});
+    Satisfaction.IsSatisfied = false;
+  }
+
   ExprResult
   EvaluateAtomicConstraint(const Expr *AtomicExpr,
                            const MultiLevelTemplateArgumentList &MLTAL);
@@ -601,14 +632,6 @@ class ConstraintSatisfactionChecker {
                       const MultiLevelTemplateArgumentList &MLTAL);
 };
 
-StringRef allocateStringFromConceptDiagnostic(const Sema &S,
-                                              const PartialDiagnostic Diag) {
-  SmallString<128> DiagString;
-  DiagString = ": ";
-  Diag.EmitToString(S.getDiagnostics(), DiagString);
-  return S.getASTContext().backupStr(DiagString);
-}
-
 } // namespace
 
 ExprResult ConstraintSatisfactionChecker::EvaluateAtomicConstraint(
@@ -647,21 +670,7 @@ ExprResult 
ConstraintSatisfactionChecker::EvaluateAtomicConstraint(
         // A non-SFINAE error has occurred as a result of this
         // substitution.
         return ExprError();
-
-      PartialDiagnosticAt SubstDiag{SourceLocation(),
-                                    PartialDiagnostic::NullDiagnostic()};
-      Info.takeSFINAEDiagnostic(SubstDiag);
-      // FIXME: This is an unfortunate consequence of there
-      //  being no serialization code for PartialDiagnostics and the fact
-      //  that serializing them would likely take a lot more storage than
-      //  just storing them as strings. We would still like, in the
-      //  future, to serialize the proper PartialDiagnostic as serializing
-      //  it as a string defeats the purpose of the diagnostic mechanism.
-      Satisfaction.Details.emplace_back(
-          new (S.Context) ConstraintSubstitutionDiagnostic{
-              SubstDiag.first,
-              allocateStringFromConceptDiagnostic(S, SubstDiag.second)});
-      Satisfaction.IsSatisfied = false;
+      consumeSFINAEFailure(Info, Satisfaction);
       return ExprEmpty();
     }
   }
@@ -726,7 +735,7 @@ 
ConstraintSatisfactionChecker::SubstitutionInTemplateArguments(
   if (S.SubstTemplateArgumentsInParameterMapping(
           Constraint.getParameterMapping(), Constraint.getBeginLoc(), MLTAL,
           SubstArgs)) {
-    Satisfaction.IsSatisfied = false;
+    consumeSFINAEFailure(Info, Satisfaction);
     return std::nullopt;
   }
 
@@ -787,7 +796,7 @@ ExprResult ConstraintSatisfactionChecker::EvaluateSlow(
       SubstitutionInTemplateArguments(Constraint, MLTAL, SubstitutedOutermost);
   if (!SubstitutedArgs) {
     Satisfaction.IsSatisfied = false;
-    return ExprEmpty();
+    return ExprError();
   }
 
   // Make sure that concepts are not evaluated in the context they are used,
@@ -821,7 +830,7 @@ ExprResult ConstraintSatisfactionChecker::EvaluateSlow(
     Satisfaction.Details.emplace_back(
         new (S.Context) ConstraintSubstitutionDiagnostic{
             SubstitutedAtomicExpr.get()->getBeginLoc(),
-            allocateStringFromConceptDiagnostic(S, Msg)});
+            allocateStringFromConceptDiagnostic(Msg)});
     return SubstitutedAtomicExpr;
   }
 
@@ -1027,7 +1036,6 @@ ExprResult ConstraintSatisfactionChecker::EvaluateSlow(
 
   if (!SubstitutedArgs) {
     Satisfaction.IsSatisfied = false;
-    // FIXME: diagnostics?
     return ExprError();
   }
 
@@ -1057,20 +1065,7 @@ ExprResult ConstraintSatisfactionChecker::EvaluateSlow(
     if (!Trap.hasErrorOccurred())
       return ExprError();
 
-    PartialDiagnosticAt SubstDiag{SourceLocation(),
-                                  PartialDiagnostic::NullDiagnostic()};
-    Info.takeSFINAEDiagnostic(SubstDiag);
-    // FIXME: This is an unfortunate consequence of there
-    //  being no serialization code for PartialDiagnostics and the fact
-    //  that serializing them would likely take a lot more storage than
-    //  just storing them as strings. We would still like, in the
-    //  future, to serialize the proper PartialDiagnostic as serializing
-    //  it as a string defeats the purpose of the diagnostic mechanism.
-    Satisfaction.Details.insert(
-        Satisfaction.Details.begin() + Size,
-        new (S.Context) ConstraintSubstitutionDiagnostic{
-            SubstDiag.first,
-            allocateStringFromConceptDiagnostic(S, SubstDiag.second)});
+    consumeSFINAEFailure(Info, Satisfaction);
     return ExprError();
   }
 
@@ -1720,10 +1715,8 @@ bool Sema::EnsureTemplateArgumentListConstraints(
   llvm::SmallVector<AssociatedConstraint, 3> AssociatedConstraints;
   TD->getAssociatedConstraints(AssociatedConstraints);
   if (CheckConstraintSatisfaction(TD, AssociatedConstraints, TemplateArgsLists,
-                                  TemplateIDRange, Satisfaction))
-    return true;
-
-  if (!Satisfaction.IsSatisfied) {
+                                  TemplateIDRange, Satisfaction) ||
+      !Satisfaction.IsSatisfied) {
     SmallString<128> TemplateArgString;
     TemplateArgString = " ";
     TemplateArgString += getTemplateArgumentBindingsText(
diff --git a/clang/lib/Sema/SemaTemplateDeduction.cpp 
b/clang/lib/Sema/SemaTemplateDeduction.cpp
index f177f0aa8645e..a554feae3dfb9 100644
--- a/clang/lib/Sema/SemaTemplateDeduction.cpp
+++ b/clang/lib/Sema/SemaTemplateDeduction.cpp
@@ -3987,9 +3987,8 @@ TemplateDeductionResult 
Sema::FinishTemplateArgumentDeduction(
     if (CheckFunctionTemplateConstraints(
             Info.getLocation(),
             FunctionTemplate->getCanonicalDecl()->getTemplatedDecl(),
-            CTAI.CanonicalConverted, Info.AssociatedConstraintsSatisfaction))
-      return TemplateDeductionResult::MiscellaneousDeductionFailure;
-    if (!Info.AssociatedConstraintsSatisfaction.IsSatisfied) {
+            CTAI.CanonicalConverted, Info.AssociatedConstraintsSatisfaction) ||
+        !Info.AssociatedConstraintsSatisfaction.IsSatisfied) {
       Info.reset(Info.takeSugared(), TemplateArgumentList::CreateCopy(
                                          Context, CTAI.CanonicalConverted));
       return TemplateDeductionResult::ConstraintsNotSatisfied;
@@ -4035,10 +4034,8 @@ TemplateDeductionResult 
Sema::FinishTemplateArgumentDeduction(
   if (IsLambda && !IsIncomplete) {
     if (CheckFunctionTemplateConstraints(
             Info.getLocation(), Specialization, CTAI.CanonicalConverted,
-            Info.AssociatedConstraintsSatisfaction))
-      return TemplateDeductionResult::MiscellaneousDeductionFailure;
-
-    if (!Info.AssociatedConstraintsSatisfaction.IsSatisfied) {
+            Info.AssociatedConstraintsSatisfaction) ||
+        !Info.AssociatedConstraintsSatisfaction.IsSatisfied) {
       Info.reset(Info.takeSugared(), TemplateArgumentList::CreateCopy(
                                          Context, CTAI.CanonicalConverted));
       return TemplateDeductionResult::ConstraintsNotSatisfied;
diff --git a/clang/lib/Sema/TreeTransform.h b/clang/lib/Sema/TreeTransform.h
index b0c836325a971..4799f72dd6177 100644
--- a/clang/lib/Sema/TreeTransform.h
+++ b/clang/lib/Sema/TreeTransform.h
@@ -7124,10 +7124,6 @@ 
TreeTransform<Derived>::TransformPackIndexingType(TypeLocBuilder &TLB,
 
   for (QualType T : Types) {
     if (!T->containsUnexpandedParameterPack()) {
-      // A pack indexing type can appear in a larger pack expansion,
-      // e.g. `Pack...[pack_of_indexes]...`
-      // so we need to temporarily disable substitution of pack elements
-      Sema::ArgPackSubstIndexRAII SubstIndex(getSema(), std::nullopt);
       QualType Transformed = getDerived().TransformType(T);
       if (Transformed.isNull())
         return QualType();
diff --git 
a/clang/test/CXX/temp/temp.constr/temp.constr.constr/non-function-templates.cpp 
b/clang/test/CXX/temp/temp.constr/temp.constr.constr/non-function-templates.cpp
index 15e00e4481e75..97c0d2e57c004 100644
--- 
a/clang/test/CXX/temp/temp.constr/temp.constr.constr/non-function-templates.cpp
+++ 
b/clang/test/CXX/temp/temp.constr/temp.constr.constr/non-function-templates.cpp
@@ -89,7 +89,9 @@ template<typename T> requires (T{}) // expected-error{{atomic 
constraint must be
 struct D { };
 
 static_assert(C<int>{}); // expected-note{{while checking constraint 
satisfaction for template 'C<int>' required here}}
+// expected-error@-1 {{constraints not satisfied for class template 'C'}}
 static_assert(D<int>{}); // expected-note{{while checking constraint 
satisfaction for template 'D<int>' required here}}
+// expected-error@-1 {{constraints not satisfied for class template 'D'}}
 
 // Test the delayed instantiation, the 'foo' implementation shouldn't cause the
 // constraint failure(or crash!) until the use to create 'y'.
diff --git a/clang/test/SemaCXX/cxx23-assume.cpp 
b/clang/test/SemaCXX/cxx23-assume.cpp
index a594a1a44337b..d2563c1c45107 100644
--- a/clang/test/SemaCXX/cxx23-assume.cpp
+++ b/clang/test/SemaCXX/cxx23-assume.cpp
@@ -129,6 +129,7 @@ struct F {
 template <typename T>
 constexpr int f5() requires C<T> { return 1; } // expected-note {{while 
checking the satisfaction}}
                                                // expected-note@-1 {{candidate 
template ignored}}
+                                               // expected-note@-2 {{because 
'T' does not satisfy 'C'}}
 
 template <typename T>
 constexpr int f5() requires (!C<T>) { return 2; } // expected-note 3 {{while 
checking the satisfaction}} \
diff --git a/clang/test/SemaCXX/cxx2c-fold-exprs.cpp 
b/clang/test/SemaCXX/cxx2c-fold-exprs.cpp
index 79d57a6f94d58..d3e681f22ab26 100644
--- a/clang/test/SemaCXX/cxx2c-fold-exprs.cpp
+++ b/clang/test/SemaCXX/cxx2c-fold-exprs.cpp
@@ -154,58 +154,84 @@ consteval int Or3() requires (C<typename T::type> || ... 
|| C<typename U::type>)
 static_assert(And1<>() == 1);
 static_assert(And1<S>() == 1);
 static_assert(And1<S, S>() == 1);
-// FIXME: The diagnostics are not so great
 static_assert(And1<int>() == 1); // expected-error {{no matching function for 
call to 'And1'}}
                                  // expected-note@#and1 {{candidate template 
ignored: constraints not satisfied [with T = <int>]}}
-                                 // expected-note@#and1 {{because substituted 
constraint expression is ill-formed: type 'int' cannot be used prior to '::' 
because it has no members}}
+                                 // expected-note@#and1 {{because 'typename 
T::type' does not satisfy 'C'}}
+                                 // expected-note@#C {{because 'T' does not 
satisfy 'A'}}
+                                 // expected-note@#C {{because substituted 
constraint expression is ill-formed: type 'int' cannot be used prior to '::' 
because it has no members}}
 
 static_assert(And1<S, int>() == 1); // expected-error {{no matching function 
for call to 'And1'}}
                                    // expected-note@#and1 {{candidate template 
ignored: constraints not satisfied [with T = <S, int>]}}
-                                   // expected-note@#and1 {{because 
substituted constraint expression is ill-formed: type 'int' cannot be used 
prior to '::' because it has no members}}
+                                   // expected-note@#and1 {{because 'typename 
T::type' does not satisfy 'C'}}
+                                   // expected-note@#C {{because 'T' does not 
satisfy 'A'}}
+                                   // expected-note@#C {{because substituted 
constraint expression is ill-formed: type 'int' cannot be used prior to '::' 
because it has no members}}
+
 
 static_assert(And1<int, S>() == 1); // expected-error {{no matching function 
for call to 'And1'}}
                                    // expected-note@#and1 {{candidate template 
ignored: constraints not satisfied [with T = <int, S>]}}
-                                   // expected-note@#and1 {{because 
substituted constraint expression is ill-formed: type 'int' cannot be used 
prior to '::' because it has no members}}
+                                   // expected-note@#and1 {{because 'typename 
T::type' does not satisfy 'C'}}
+                                   // expected-note@#C {{because 'T' does not 
satisfy 'A'}}
+                                   // expected-note@#C {{because substituted 
constraint expression is ill-formed: type 'int' cannot be used prior to '::' 
because it has no members}}
+
 
 static_assert(And2<S>() == 2);
 static_assert(And2<S, S>() == 2);
 static_assert(And2<int>() == 2);  // expected-error {{no matching function for 
call to 'And2'}}
                                   // expected-note@#and2 {{candidate template 
ignored: constraints not satisfied [with T = int, U = <>]}}
-                                  // expected-note@#and2 {{because substituted 
constraint expression is ill-formed: type 'int' cannot be used prior to '::' 
because it has no members}}
+                                  // expected-note@#and2 {{because 'typename 
U::type' does not satisfy 'C'}}
+                                  // expected-note@#C {{because 'T' does not 
satisfy 'A'}}
+                                  // expected-note@#C {{because substituted 
constraint expression is ill-formed: type 'int' cannot be used prior to '::' 
because it has no members}}
+
 
 
 static_assert(And2<int, int>() == 2);  // expected-error {{no matching 
function for call to 'And2'}}
                                       // expected-note@#and2 {{candidate 
template ignored: constraints not satisfied [with T = S, U = <int>]}} \
-                                      // expected-note@#and2 {{because 
substituted constraint expression is ill-formed: type 'int' cannot be used 
prior to '::' because it has no members}}
+                                      // expected-note@#and2 {{because 
'typename U::type' does not satisfy 'C'}}
+                                      // expected-note@#C {{because 'T' does 
not satisfy 'A'}}
+                                      // expected-note@#C {{because 
substituted constraint expression is ill-formed: type 'int' cannot be used 
prior to '::' because it has no members}}
+
 
 static_assert(And2<S, int>() == 2); // expected-error {{no matching function 
for call to 'And2'}}
                                    // expected-note@#and2 {{candidate template 
ignored: constraints not satisfied [with T = int, U = <S>]}}
-                                   // expected-note@#and2 {{because 
substituted constraint expression is ill-formed: type 'int' cannot be used 
prior to '::' because it has no members}}
+                                   // expected-note@#and2 {{because 'typename 
T::type' does not satisfy 'C'}}
+                                   // expected-note@#C {{because 'T' does not 
satisfy 'A'}}
+                                   // expected-note@#C {{because substituted 
constraint expression is ill-formed: type 'int' cannot be used prior to '::' 
because it has no members}}
+
 
 static_assert(And2<int, S>() == 2); // expected-error {{no matching function 
for call to 'And2'}}
                                    // expected-note@#and2 {{candidate template 
ignored: constraints not satisfied [with T = int, U = <int>]}}
-                                   // expected-note@#and2 {{because 
substituted constraint expression is ill-formed: type 'int' cannot be used 
prior to '::' because it has no members}}
+                                   // expected-note@#and2 {{because 'typename 
T::type' does not satisfy 'C'}}
+                                   // expected-note@#C {{because 'T' does not 
satisfy 'A'}}
+                                   // expected-note@#C {{because substituted 
constraint expression is ill-formed: type 'int' cannot be used prior to '::' 
because it has no members}}
 
 static_assert(And3<S>() == 3);
 static_assert(And3<S, S>() == 3);
 static_assert(And3<int>() == 3);   // expected-error {{no matching function 
for call to 'And3'}}
                                    // expected-note@#and3 {{candidate template 
ignored: constraints not satisfied [with T = int, U = <>]}}
-                                   // expected-note@#and3 {{because 
substituted constraint expression is ill-formed: type 'int' cannot be used 
prior to '::' because it has no members}}
+                                   // expected-note@#and3 {{because 'typename 
U::type' does not satisfy 'C'}}
+                                   // expected-note@#C {{because 'T' does not 
satisfy 'A'}}
+                                   // expected-note@#C {{because substituted 
constraint expression is ill-formed: type 'int' cannot be used prior to '::' 
because it has no members}}
 
 
 static_assert(And3<int, int>() == 3);  // expected-error {{no matching 
function for call to 'And3'}}
                                       // expected-note@#and3 {{candidate 
template ignored: constraints not satisfied [with T = int, U = <int>]}}
-                                      // expected-note@#and3 {{because 
substituted constraint expression is ill-formed: type 'int' cannot be used 
prior to '::' because it has no members}}
+                                      // expected-note@#and3 {{because 
'typename T::type' does not satisfy 'C'}}
+                                      // expected-note@#C {{because 'T' does 
not satisfy 'A'}}
+                                      // expected-note@#C {{because 
substituted constraint expression is ill-formed: type 'int' cannot be used 
prior to '::' because it has no members}}
 
 
 static_assert(And3<S, int>() == 3); // expected-error {{no matching function 
for call to 'And3'}}
                                    // expected-note@#and3 {{candidate template 
ignored: constraints not satisfied [with T = S, U = <int>]}}
-                                   // expected-note@#and3 {{because 
substituted constraint expression is ill-formed: type 'int' cannot be used 
prior to '::' because it has no members}}
+                                   // expected-note@#and3 {{because 'typename 
T::type' does not satisfy 'C'}}
+                                   // expected-note@#C {{because 'T' does not 
satisfy 'A'}}
+                                   // expected-note@#C {{because substituted 
constraint expression is ill-formed: type 'int' cannot be used prior to '::' 
because it has no members}}
 
 
 static_assert(And3<int, S>() == 3); // expected-error {{no matching function 
for call to 'And3'}}
                                    // expected-note@#and3 {{candidate template 
ignored: constraints not satisfied [with T = int, U = <S>]}}
-                                   // expected-note@#and3 {{because 
substituted constraint expression is ill-formed: type 'int' cannot be used 
prior to '::' because it has no members}}
+                                   // expected-note@#and3 {{because 'typename 
T::type' does not satisfy 'C'}}
+                                   // expected-note@#C...
[truncated]

``````````

</details>


https://github.com/llvm/llvm-project/pull/218618
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