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When adding built-in operator candidates for overload resolution 

involving 'restrict', place restrict on the pointer type rather than
on the pointee type. Also make sure that we gather restrict from the
pointer type. Fixes PR12854 and the major part of PR11093.

llvm-svn: 157910
This commit is contained in:
Douglas Gregor 2012-06-04 00:15:09 +00:00
parent 34b9c511c1
commit 5bee25884b
2 changed files with 129 additions and 26 deletions
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136
clang/lib/Sema/SemaOverload.cpp
View File

@ -6120,40 +6120,49 @@ BuiltinCandidateTypeSet::AddPointerWithMoreQualifiedTypeVariants(QualType Ty,
const PointerType *PointerTy = Ty->getAs<PointerType>();
bool buildObjCPtr = false;
if (!PointerTy) {
if (const ObjCObjectPointerType *PTy = Ty->getAs<ObjCObjectPointerType>()) {
PointeeTy = PTy->getPointeeType();
buildObjCPtr = true;
}
else
llvm_unreachable("type was not a pointer type!");
}
else
const ObjCObjectPointerType *PTy = Ty->castAs<ObjCObjectPointerType>();
PointeeTy = PTy->getPointeeType();
buildObjCPtr = true;
} else {
PointeeTy = PointerTy->getPointeeType();
}
// Don't add qualified variants of arrays. For one, they're not allowed
// (the qualifier would sink to the element type), and for another, the
// only overload situation where it matters is subscript or pointer +- int,
// and those shouldn't have qualifier variants anyway.
if (PointeeTy->isArrayType())
return true;
unsigned BaseCVR = PointeeTy.getCVRQualifiers();
if (const ConstantArrayType *Array =Context.getAsConstantArrayType(PointeeTy))
BaseCVR = Array->getElementType().getCVRQualifiers();
bool hasVolatile = VisibleQuals.hasVolatile();
bool hasRestrict = VisibleQuals.hasRestrict();
// Iterate through all strict supersets of BaseCVR.
for (unsigned CVR = BaseCVR+1; CVR <= Qualifiers::CVRMask; ++CVR) {
if ((CVR | BaseCVR) != CVR) continue;
// Skip over Volatile/Restrict if no Volatile/Restrict found anywhere
// in the types.
// Skip over volatile if no volatile found anywhere in the types.
if ((CVR & Qualifiers::Volatile) && !hasVolatile) continue;
if ((CVR & Qualifiers::Restrict) && !hasRestrict) continue;
// Skip over restrict if no restrict found anywhere in the types, or if
// the type cannot be restrict-qualified.
if ((CVR & Qualifiers::Restrict) &&
(!hasRestrict ||
(!(PointeeTy->isAnyPointerType() || PointeeTy->isReferenceType()))))
continue;
// Build qualified pointee type.
QualType QPointeeTy = Context.getCVRQualifiedType(PointeeTy, CVR);
// Build qualified pointer type.
QualType QPointerTy;
if (!buildObjCPtr)
PointerTypes.insert(Context.getPointerType(QPointeeTy));
QPointerTy = Context.getPointerType(QPointeeTy);
else
PointerTypes.insert(Context.getObjCObjectPointerType(QPointeeTy));
QPointerTy = Context.getObjCObjectPointerType(QPointeeTy);
// Insert qualified pointer type.
PointerTypes.insert(QPointerTy);
}
return true;
@ -6350,6 +6359,8 @@ static Qualifiers CollectVRQualifiers(ASTContext &Context, Expr* ArgExpr) {
// as see them.
bool done = false;
while (!done) {
if (CanTy.isRestrictQualified())
VRQuals.addRestrict();
if (const PointerType *ResTypePtr = CanTy->getAs<PointerType>())
CanTy = ResTypePtr->getPointeeType();
else if (const MemberPointerType *ResTypeMPtr =
@ -6359,8 +6370,6 @@ static Qualifiers CollectVRQualifiers(ASTContext &Context, Expr* ArgExpr) {
done = true;
if (CanTy.isVolatileQualified())
VRQuals.addVolatile();
if (CanTy.isRestrictQualified())
VRQuals.addRestrict();
if (VRQuals.hasRestrict() && VRQuals.hasVolatile())
return VRQuals;
}
@ -6488,7 +6497,8 @@ class BuiltinOperatorOverloadBuilder {
/// \brief Helper method to factor out the common pattern of adding overloads
/// for '++' and '--' builtin operators.
void addPlusPlusMinusMinusStyleOverloads(QualType CandidateTy,
bool HasVolatile) {
bool HasVolatile,
bool HasRestrict) {
QualType ParamTypes[2] = {
S.Context.getLValueReferenceType(CandidateTy),
S.Context.IntTy
@ -6511,6 +6521,33 @@ class BuiltinOperatorOverloadBuilder {
else
S.AddBuiltinCandidate(CandidateTy, ParamTypes, Args, 2, CandidateSet);
}
// Add restrict version only if there are conversions to a restrict type
// and our candidate type is a non-restrict-qualified pointer.
if (HasRestrict && CandidateTy->isAnyPointerType() &&
!CandidateTy.isRestrictQualified()) {
ParamTypes[0]
= S.Context.getLValueReferenceType(
S.Context.getCVRQualifiedType(CandidateTy, Qualifiers::Restrict));
if (NumArgs == 1)
S.AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 1, CandidateSet);
else
S.AddBuiltinCandidate(CandidateTy, ParamTypes, Args, 2, CandidateSet);
if (HasVolatile) {
ParamTypes[0]
= S.Context.getLValueReferenceType(
S.Context.getCVRQualifiedType(CandidateTy,
(Qualifiers::Volatile |
Qualifiers::Restrict)));
if (NumArgs == 1)
S.AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 1,
CandidateSet);
else
S.AddBuiltinCandidate(CandidateTy, ParamTypes, Args, 2, CandidateSet);
}
}
}
public:
@ -6565,7 +6602,8 @@ public:
Arith < NumArithmeticTypes; ++Arith) {
addPlusPlusMinusMinusStyleOverloads(
getArithmeticType(Arith),
VisibleTypeConversionsQuals.hasVolatile());
VisibleTypeConversionsQuals.hasVolatile(),
VisibleTypeConversionsQuals.hasRestrict());
}
}
@ -6589,8 +6627,10 @@ public:
continue;
addPlusPlusMinusMinusStyleOverloads(*Ptr,
(!S.Context.getCanonicalType(*Ptr).isVolatileQualified() &&
VisibleTypeConversionsQuals.hasVolatile()));
(!(*Ptr).isVolatileQualified() &&
VisibleTypeConversionsQuals.hasVolatile()),
(!(*Ptr).isRestrictQualified() &&
VisibleTypeConversionsQuals.hasRestrict()));
}
}
@ -7048,14 +7088,36 @@ public:
S.AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2, CandidateSet,
/*IsAssigmentOperator=*/ isEqualOp);
if (!S.Context.getCanonicalType(*Ptr).isVolatileQualified() &&
VisibleTypeConversionsQuals.hasVolatile()) {
bool NeedVolatile = !(*Ptr).isVolatileQualified() &&
VisibleTypeConversionsQuals.hasVolatile();
if (NeedVolatile) {
// volatile version
ParamTypes[0] =
S.Context.getLValueReferenceType(S.Context.getVolatileType(*Ptr));
S.AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2, CandidateSet,
/*IsAssigmentOperator=*/isEqualOp);
}
if (!(*Ptr).isRestrictQualified() &&
VisibleTypeConversionsQuals.hasRestrict()) {
// restrict version
ParamTypes[0]
= S.Context.getLValueReferenceType(S.Context.getRestrictType(*Ptr));
S.AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2, CandidateSet,
/*IsAssigmentOperator=*/isEqualOp);
if (NeedVolatile) {
// volatile restrict version
ParamTypes[0]
= S.Context.getLValueReferenceType(
S.Context.getCVRQualifiedType(*Ptr,
(Qualifiers::Volatile |
Qualifiers::Restrict)));
S.AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2,
CandidateSet,
/*IsAssigmentOperator=*/isEqualOp);
}
}
}
if (isEqualOp) {
@ -7076,14 +7138,36 @@ public:
S.AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2, CandidateSet,
/*IsAssigmentOperator=*/true);
if (!S.Context.getCanonicalType(*Ptr).isVolatileQualified() &&
VisibleTypeConversionsQuals.hasVolatile()) {
bool NeedVolatile = !(*Ptr).isVolatileQualified() &&
VisibleTypeConversionsQuals.hasVolatile();
if (NeedVolatile) {
// volatile version
ParamTypes[0] =
S.Context.getLValueReferenceType(S.Context.getVolatileType(*Ptr));
S.AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2,
CandidateSet, /*IsAssigmentOperator=*/true);
}
if (!(*Ptr).isRestrictQualified() &&
VisibleTypeConversionsQuals.hasRestrict()) {
// restrict version
ParamTypes[0]
= S.Context.getLValueReferenceType(S.Context.getRestrictType(*Ptr));
S.AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2,
CandidateSet, /*IsAssigmentOperator=*/true);
if (NeedVolatile) {
// volatile restrict version
ParamTypes[0]
= S.Context.getLValueReferenceType(
S.Context.getCVRQualifiedType(*Ptr,
(Qualifiers::Volatile |
Qualifiers::Restrict)));
S.AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2,
CandidateSet, /*IsAssigmentOperator=*/true);
}
}
}
}
}

19
clang/test/SemaCXX/overloaded-builtin-operators.cpp
View File

@ -237,3 +237,22 @@ namespace PR7851 {
(void)(x - x);
}
}
namespace PR12854 {
enum { size = 1 };
void plus_equals() {
int* __restrict py;
py += size;
}
struct RestrictInt {
operator int* __restrict &();
};
void user_conversions(RestrictInt ri) {
++ri;
--ri;
ri++;
ri--;
}
}