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Kill off the remaining places which generate CK_Unknown casts. 

llvm-svn: 119326
This commit is contained in:
John McCall 2010-11-16 02:32:08 +00:00
parent 5aa33ca29d
commit 29600e160e
4 changed files with 42 additions and 20 deletions
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8
clang/include/clang/Sema/Sema.h
View File

@ -4108,8 +4108,12 @@ public:
/// CheckAssignmentConstraints - Perform type checking for assignment,
/// argument passing, variable initialization, and function return values.
/// This routine is only used by the following two methods. C99 6.5.16.
AssignConvertType CheckAssignmentConstraints(QualType lhs, QualType rhs,
/// C99 6.5.16.
AssignConvertType CheckAssignmentConstraints(QualType lhs, QualType rhs);
/// Check assignment constraints and prepare for a conversion of the
/// RHS to the LHS type.
AssignConvertType CheckAssignmentConstraints(QualType lhs, Expr *&rhs,
CastKind &Kind);
// CheckSingleAssignmentConstraints - Currently used by

3
clang/lib/Sema/SemaDeclAttr.cpp
View File

@ -1375,8 +1375,7 @@ static void HandleCleanupAttr(Decl *d, const AttributeList &Attr, Sema &S) {
// If this ever proves to be a problem it should be easy to fix.
QualType Ty = S.Context.getPointerType(VD->getType());
QualType ParamTy = FD->getParamDecl(0)->getType();
CastKind K;
if (S.CheckAssignmentConstraints(ParamTy, Ty, K) != Sema::Compatible) {
if (S.CheckAssignmentConstraints(ParamTy, Ty) != Sema::Compatible) {
S.Diag(Attr.getLoc(),
diag::err_attribute_cleanup_func_arg_incompatible_type) <<
Attr.getParameterName() << ParamTy << Ty;

39
clang/lib/Sema/SemaExpr.cpp
View File

@ -5224,6 +5224,19 @@ Sema::CheckObjCPointerTypesForAssignment(QualType lhsType, QualType rhsType) {
return IncompatiblePointer;
}
Sema::AssignConvertType
Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) {
// Fake up an opaque expression. We don't actually care about what
// cast operations are required, so if CheckAssignmentConstraints
// adds casts to this they'll be wasted, but fortunately that doesn't
// usually happen on valid code.
OpaqueValueExpr rhs(rhsType, VK_RValue);
Expr *rhsPtr = &rhs;
CastKind K = CK_Invalid;
return CheckAssignmentConstraints(lhsType, rhsPtr, K);
}
/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently
/// has code to accommodate several GCC extensions when type checking
/// pointers. Here are some objectionable examples that GCC considers warnings:
@ -5242,8 +5255,10 @@ Sema::CheckObjCPointerTypesForAssignment(QualType lhsType, QualType rhsType) {
///
/// Sets 'Kind' for any result kind except Incompatible.
Sema::AssignConvertType
Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType,
Sema::CheckAssignmentConstraints(QualType lhsType, Expr *&rhs,
CastKind &Kind) {
QualType rhsType = rhs->getType();
// Get canonical types. We're not formatting these types, just comparing
// them.
lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType();
@ -5282,7 +5297,14 @@ Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType,
if (rhsType->isExtVectorType())
return Incompatible;
if (rhsType->isArithmeticType()) {
Kind = CK_Unknown; // FIXME: vector splat, potentially requires two casts
// CK_VectorSplat does T -> vector T, so first cast to the
// element type.
QualType elType = cast<ExtVectorType>(lhsType)->getElementType();
if (elType != rhsType) {
Kind = PrepareScalarCast(*this, rhs, elType);
ImpCastExprToType(rhs, elType, Kind);
}
Kind = CK_VectorSplat;
return Compatible;
}
}
@ -5310,7 +5332,7 @@ Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType,
if (lhsType->isArithmeticType() && rhsType->isArithmeticType() &&
!(getLangOptions().CPlusPlus && lhsType->isEnumeralType())) {
Kind = CK_Unknown; // FIXME: reuse the cast logic if possible
Kind = PrepareScalarCast(*this, rhs, lhsType);
return Compatible;
}
@ -5506,10 +5528,12 @@ Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, Expr *&rExpr) {
}
}
Expr *rhs = rExpr;
CastKind Kind = CK_Invalid;
if (CheckAssignmentConstraints(it->getType(), rExpr->getType(), Kind)
if (CheckAssignmentConstraints(it->getType(), rhs, Kind)
== Compatible) {
ImpCastExprToType(rExpr, it->getType(), Kind);
ImpCastExprToType(rhs, it->getType(), Kind);
rExpr = rhs;
InitField = *it;
break;
}
@ -5561,7 +5585,7 @@ Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) {
CastKind Kind = CK_Invalid;
Sema::AssignConvertType result =
CheckAssignmentConstraints(lhsType, rExpr->getType(), Kind);
CheckAssignmentConstraints(lhsType, rExpr, Kind);
// C99 6.5.16.1p2: The value of the right operand is converted to the
// type of the assignment expression.
@ -6633,8 +6657,7 @@ QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS,
}
} else {
// Compound assignment "x += y"
CastKind Kind = CK_Invalid; // forgotten?
ConvTy = CheckAssignmentConstraints(LHSType, RHSType, Kind);
ConvTy = CheckAssignmentConstraints(LHSType, RHSType);
}
if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType,

12
clang/lib/Sema/SemaObjCProperty.cpp
View File

@ -424,11 +424,9 @@ Decl *Sema::ActOnPropertyImplDecl(Scope *S,
Context.canAssignObjCInterfaces(
PropType->getAs<ObjCObjectPointerType>(),
IvarType->getAs<ObjCObjectPointerType>());
else {
CastKind K = CK_Invalid;
compat = (CheckAssignmentConstraints(PropType, IvarType, K)
else
compat = (CheckAssignmentConstraints(PropType, IvarType)
== Compatible);
}
if (!compat) {
Diag(PropertyLoc, diag::error_property_ivar_type)
<< property->getDeclName() << PropType
@ -647,11 +645,9 @@ bool Sema::DiagnosePropertyAccessorMismatch(ObjCPropertyDecl *property,
if (GetterMethod &&
GetterMethod->getResultType() != property->getType()) {
AssignConvertType result = Incompatible;
if (property->getType()->isObjCObjectPointerType()) {
CastKind Kind = CK_Invalid;
if (property->getType()->isObjCObjectPointerType())
result = CheckAssignmentConstraints(GetterMethod->getResultType(),
property->getType(), Kind);
}
property->getType());
if (result != Compatible) {
Diag(Loc, diag::warn_accessor_property_type_mismatch)
<< property->getDeclName()