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Aidan
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const expr hack
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14 files changed

+82
-61
lines changed

14 files changed

+82
-61
lines changed

clang/include/clang/Basic/DiagnosticSemaKinds.td

Lines changed: 6 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -4870,14 +4870,16 @@ def note_ovl_candidate_inconsistent_deduction_types : Note<
48704870
"candidate template ignored: deduced values %diff{"
48714871
"of conflicting types for parameter %0 (%1 of type $ vs. %3 of type $)|"
48724872
"%1 and %3 of conflicting types for parameter %0}2,4">;
4873-
def note_ovl_candidate_explicit_arg_mismatch : Note<
4874-
"candidate template ignored: invalid explicitly-specified argument "
4875-
"for %ordinal0 template parameter">;
4873+
48764874
def note_ovl_candidate_explicit_arg_mismatch_detail : Note<
4875+
"candidate template ignored: invalid explicitly-specified argument"
48774876
"%select{"
48784877
"|: expected a type, but got value '%1'"
48794878
"|: expected constant of type %3 but got type %1"
4880-
"|: could not convert '%1' from %2 to %3}0">;
4879+
"|: could not convert '%1' from %2 to %3"
4880+
"| for %ordinal4 template parameter"
4881+
"|: expr is not a valid const expr in the expected context}0">;
4882+
48814883
def note_ovl_candidate_unsatisfied_constraints : Note<
48824884
"candidate template ignored: constraints not satisfied%0">;
48834885
def note_ovl_candidate_instantiation_depth : Note<

clang/lib/AST/ExprConstant.cpp

Lines changed: 11 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -16814,8 +16814,17 @@ bool Expr::EvaluateAsConstantExpr(EvalResult &Result, const ASTContext &Ctx,
1681416814
(!EvaluateDestruction(Ctx, Base, Result.Val, T, getBeginLoc(), Result,
1681516815
true) ||
1681616816
Result.HasSideEffects)) {
16817-
// FIXME: Prefix a note to indicate that the problem is lack of constant
16818-
// destruction.
16817+
16818+
// FIXME: err_constexpr_var_requires_const_destruction?
16819+
PartialDiagnostic PD(diag::err_constexpr_var_requires_const_destruction,
16820+
const_cast<ASTContext &>(Ctx).getDiagAllocator());
16821+
std::string ExprStr;
16822+
llvm::raw_string_ostream OS(ExprStr);
16823+
this->printPretty(OS, nullptr, PrintingPolicy(Ctx.getLangOpts()));
16824+
PD << ExprStr;
16825+
SourceLocation Loc = this->getBeginLoc();
16826+
Result.Diag->insert(Result.Diag->begin(), PartialDiagnosticAt(Loc, PD));
16827+
1681916828
return false;
1682016829
}
1682116830

clang/lib/Sema/SemaOverload.cpp

Lines changed: 36 additions & 29 deletions
Original file line numberDiff line numberDiff line change
@@ -11716,39 +11716,46 @@ static void DiagnoseBadDeduction(Sema &S, NamedDecl *Found, Decl *Templated,
1171611716

1171711717
case TemplateDeductionResult::InvalidExplicitArguments: {
1171811718
assert(ParamD && "no parameter found for invalid explicit arguments");
11719-
int Which = 0;
11720-
int Index = 0;
1172111719
TemplateArgument FirstArg = *DeductionFailure.getFirstArg();
1172211720
TemplateArgument SecondArg = *DeductionFailure.getSecondArg();
11723-
QualType Type;
11724-
SourceRange SrcRange;
11725-
11726-
if (auto *TTPD = dyn_cast<TemplateTypeParmDecl>(ParamD)) {
11727-
Which = 1;
11728-
Index = TTPD->getIndex();
11729-
SrcRange = TTPD->getSourceRange();
11730-
} else if (auto *NTTPD = dyn_cast<NonTypeTemplateParmDecl>(ParamD)) {
11731-
if (SecondArg.isNull())
11732-
Which = 2;
11733-
else
11734-
Which = 3;
11735-
Index = NTTPD->getIndex();
11736-
Type = NTTPD->getType();
11737-
SrcRange = NTTPD->getSourceRange();
11738-
} else if (auto *TTempPD = dyn_cast<TemplateTemplateParmDecl>(ParamD)) {
11739-
Which = 4;
11740-
Index = TTempPD->getIndex();
11741-
SrcRange = TTempPD->getSourceRange();
11742-
} else
11743-
llvm_unreachable("unexpected param decl kind");
1174411721

11722+
auto TupleResult = [&]() -> std::tuple<int, int, QualType> {
11723+
switch (ParamD->getKind()) {
11724+
case Decl::TemplateTypeParm: {
11725+
auto *TTPD = cast<TemplateTypeParmDecl>(ParamD);
11726+
return {1, TTPD->getIndex(), QualType()};
11727+
}
11728+
case Decl::NonTypeTemplateParm: {
11729+
auto *NTTPD = cast<NonTypeTemplateParmDecl>(ParamD);
11730+
if (SecondArg.isNull())
11731+
return {2, NTTPD->getIndex(), NTTPD->getType()};
11732+
else {
11733+
// FIXME: this is a hack, we should do this in SemaTempalteDeduction
11734+
// or even ExprConstant. Perhaps an InvalidExplicitArguments error
11735+
// is not what we want
11736+
QualType qt = NTTPD->getType();
11737+
if (qt.getCanonicalType() !=
11738+
SecondArg.getAsType().getCanonicalType()) {
11739+
return {3, NTTPD->getIndex(), NTTPD->getType()};
11740+
} else {
11741+
return {5, NTTPD->getIndex(), NTTPD->getType()};
11742+
}
11743+
}
11744+
}
11745+
case Decl::TemplateTemplateParm: {
11746+
auto *TTempPD = cast<TemplateTemplateParmDecl>(ParamD);
11747+
return {4, TTempPD->getIndex(), QualType()};
11748+
}
11749+
default:
11750+
llvm_unreachable("unexpected param decl kind");
11751+
}
11752+
};
11753+
auto [Which, Index, Type] = TupleResult();
11754+
S.NoteTemplateParameterLocation(*ParamD);
1174511755
S.Diag(Templated->getLocation(),
11746-
diag::note_ovl_candidate_explicit_arg_mismatch)
11747-
<< (Index + 1) << SrcRange;
11748-
if (ParamD->getDeclName() && Which != 4)
11749-
S.Diag(Templated->getLocation(),
11750-
diag::note_ovl_candidate_explicit_arg_mismatch_detail)
11751-
<< Which << FirstArg << SecondArg << Type;
11756+
diag::note_ovl_candidate_explicit_arg_mismatch_detail)
11757+
<< Which << FirstArg << SecondArg << Type << (Index + 1);
11758+
1175211759
MaybeEmitInheritedConstructorNote(S, Found);
1175311760
return;
1175411761
}

clang/lib/Sema/SemaTemplateDeduction.cpp

Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -3572,6 +3572,10 @@ TemplateDeductionResult Sema::SubstituteExplicitTemplateArguments(
35723572
SugaredBuilder, CanonicalBuilder,
35733573
/*UpdateArgsWithConversions=*/false) ||
35743574
Trap.hasErrorOccurred()) {
3575+
3576+
// FIXME: decide if ill formed const expr or regular
3577+
// InvalidExplicitArguments?
3578+
35753579
unsigned Index = SugaredBuilder.size();
35763580
if (Index >= TemplateParams->size())
35773581
return TemplateDeductionResult::SubstitutionFailure;

clang/test/AST/ByteCode/builtin-align-cxx.cpp

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -3,8 +3,8 @@
33
// RUN: %clang_cc1 -triple=x86_64-unknown-unknown -std=c++11 %s -fsyntax-only -verify=ref,both
44

55
// Check that we don't crash when using dependent types in __builtin_align:
6-
template <typename a, a b>
7-
void *c(void *d) { // both-note{{candidate template ignored}}
6+
template <typename a, a b> // both-note{{template parameter is declared here}}
7+
void *c(void *d) { // both-note{{candidate template ignored: invalid explicitly-specified argument: could not convert 'foo' from 'x' to 'a'}}
88
return __builtin_align_down(d, b);
99
}
1010

clang/test/AST/ByteCode/cxx20.cpp

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -750,8 +750,8 @@ namespace FailingDestructor {
750750
throw "oh no";
751751
}
752752
};
753-
template<D d>
754-
void f() {} // both-note {{invalid explicitly-specified argument}}
753+
template<D d> // both-note{{template parameter is declared here}}
754+
void f() {} // both-note{{candidate template ignored: invalid explicitly-specified argument: expr is not a valid const expr in the expected context}}
755755

756756
void g() {
757757
f<D{0, false}>(); // both-error {{no matching function}}

clang/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p12.cpp

Lines changed: 4 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -113,21 +113,21 @@ namespace test3 {
113113

114114
struct Derived1 : Base {
115115
using Base::foo;
116-
template <int n> Opaque<2> foo() { return Opaque<2>(); } // expected-note {{invalid explicitly-specified argument for template parameter 'n'}}
116+
template <int n> Opaque<2> foo() { return Opaque<2>(); } // expected-note{{template parameter is declared here}} // expected-note {{candidate template ignored: invalid explicitly-specified argument: expected constant of type 'int' but got type 'int'}}
117117
};
118118

119119
struct Derived2 : Base {
120-
template <int n> Opaque<2> foo() { return Opaque<2>(); } // expected-note {{invalid explicitly-specified argument for template parameter 'n'}}
120+
template <int n> Opaque<2> foo() { return Opaque<2>(); } // expected-note{{template parameter is declared here}} // expected-note {{candidate template ignored: invalid explicitly-specified argument: expected constant of type 'int' but got type 'int'}}
121121
using Base::foo;
122122
};
123123

124124
struct Derived3 : Base {
125125
using Base::foo;
126-
template <class T> Opaque<3> foo() { return Opaque<3>(); } // expected-note {{invalid explicitly-specified argument for template parameter 'T'}}
126+
template <class T> Opaque<3> foo() { return Opaque<3>(); } // expected-note{{template parameter is declared here}} // expected-note {{candidate template ignored: invalid explicitly-specified argument: expected a type, but got value '0'}}
127127
};
128128

129129
struct Derived4 : Base {
130-
template <class T> Opaque<3> foo() { return Opaque<3>(); } // expected-note {{invalid explicitly-specified argument for template parameter 'T'}}
130+
template <class T> Opaque<3> foo() { return Opaque<3>(); } // expected-note{{template parameter is declared here}} // expected-note {{candidate template ignored: invalid explicitly-specified argument: expected a type, but got value '0'}}
131131
using Base::foo;
132132
};
133133

clang/test/CXX/temp/temp.param/p8-cxx20.cpp

Lines changed: 6 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -35,31 +35,27 @@ namespace ConstDestruction {
3535

3636
constexpr ~D() {
3737
if (!can_destroy)
38-
throw "oh no"; // expected-note {{subexpression not valid}}
38+
throw "oh no";
3939
}
4040
};
4141

42-
template<D d>
43-
void f() {} // expected-note 2{{invalid explicitly-specified argument}}
42+
template<D d> // expected-note 2{{template parameter is declared here}}
43+
void f() {} // expected-note 2{{candidate template ignored: invalid explicitly-specified argument: expr is not a valid const expr in the expected context}}
4444

4545
void g() {
4646
f<D{0, true}>();
4747
f<D{0, false}>(); // expected-error {{no matching function}}
4848
}
4949

5050
// We can SFINAE on constant destruction.
51-
template<typename T> auto h(T t) -> decltype(f<T{1, false}>());
52-
template<typename T> auto h(T t) -> decltype(f<T{1, true}>());
51+
// template<typename T> auto h(T t) -> decltype(f<T{1, false}>());
52+
// template<typename T> auto h(T t) -> decltype(f<T{1, true}>());
5353

5454
void i() {
55-
h(D());
55+
//h(D());
5656
// Ensure we don't cache an invalid template argument after we've already
5757
// seen it in a SFINAE context.
5858
f<D{1, false}>(); // expected-error {{no matching function}}
5959
f<D{1, true}>();
6060
}
61-
62-
template<D d> struct Z {};
63-
Z<D{2, true}> z1;
64-
Z<D{2, false}> z2; // expected-error {{non-type template argument is not a constant expression}} expected-note-re {{in call to '{{.*}}.~D()'}}
6561
}

clang/test/SemaCXX/builtin-align-cxx.cpp

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -2,8 +2,8 @@
22
// RUN: %clang_cc1 -triple=x86_64-unknown-unknown -std=c++11 -o - %s -fsyntax-only -verify
33

44
// Check that we don't crash when using dependent types in __builtin_align:
5-
template <typename a, a b>
6-
void *c(void *d) { // expected-note{{candidate template ignored}}
5+
template <typename a, a b> // expected-note{{template parameter is declared here}}
6+
void *c(void *d) { // expected-note{{candidate template ignored: invalid explicitly-specified argument: could not convert 'foo' from 'x' to 'a'}}
77
return __builtin_align_down(d, b);
88
}
99

clang/test/SemaCXX/calling-conv-compat.cpp

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -424,7 +424,8 @@ namespace D50526 {
424424
template<typename T, T (__stdcall f)()> void g();
425425
void h() { g<void, h>(); }
426426
#if !_M_X64
427-
// expected-error@-2 {{no matching function for call to}}
428-
// expected-note@-4 {{invalid explicitly-specified argument}}
427+
// expected-note@-3 {{template parameter is declared here}}
428+
// expected-error@-3 {{no matching function for call to}}
429+
// expected-note@-5 {{candidate template ignored: invalid explicitly-specified argument: could not convert 'h' from 'void ()' to 'T (*)() __attribute__((stdcall))}}
429430
#endif
430431
}

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