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More __unknown_anytype work. 

llvm-svn: 129269
This commit is contained in:
John McCall 2011-04-11 07:02:50 +00:00
parent 62920834fa
commit 2d2e870745
17 changed files with 415 additions and 122 deletions
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1
clang/include/clang/AST/Expr.h
View File

@ -2222,6 +2222,7 @@ private:
case CK_FloatingComplexToBoolean:
case CK_IntegralComplexToBoolean:
case CK_ResolveUnknownAnyType:
case CK_ResolveUnknownAnyTypeToReference:
case CK_LValueBitCast: // -> bool&
case CK_UserDefinedConversion: // operator bool()
assert(path_empty() && "Cast kind should not have a base path!");

5
clang/include/clang/AST/OperationKinds.h
View File

@ -248,7 +248,10 @@ enum CastKind {
CK_IntegralComplexToFloatingComplex,
/// \brief Assign an unknown-any declaration a type.
CK_ResolveUnknownAnyType
CK_ResolveUnknownAnyType,
/// \brief Assign an unknown-any declaration a reference type.
CK_ResolveUnknownAnyTypeToReference
};
#define CK_Invalid ((CastKind) -1)

10
clang/include/clang/Basic/DiagnosticSemaKinds.td
View File

@ -3851,8 +3851,14 @@ def err_sizeof_pack_no_pack_name_suggest : Error<
"%0 does not refer to the name of a parameter pack; did you mean %1?">;
def note_parameter_pack_here : Note<"parameter pack %0 declared here">;
def err_bad_use_of_unknown_any : Error<
"no known type for %0; must explicitly cast this expression to use it">;
def err_uncasted_use_of_unknown_any : Error<
"%0 has unknown type; cast it to its declared type to use it">;
def err_uncasted_call_of_unknown_any : Error<
"%0 has unknown return type; cast the call to its declared return type">;
def err_unsupported_unknown_any_decl : Error<
"%0 has unknown type, which is unsupported for this kind of declaration">;
def err_unsupported_unknown_any_expr : Error<
"unsupported expression with unknown type">;
} // end of sema category

2
clang/lib/AST/Expr.cpp
View File

@ -1057,6 +1057,8 @@ const char *CastExpr::getCastKindName() const {
return "IntegralComplexToFloatingComplex";
case CK_ResolveUnknownAnyType:
return "ResolveUnknownAnyType";
case CK_ResolveUnknownAnyTypeToReference:
return "ResolveUnknownAnyTypeToReference";
}
llvm_unreachable("Unhandled cast kind!");

2
clang/lib/AST/ExprConstant.cpp
View File

@ -1799,6 +1799,7 @@ bool IntExprEvaluator::VisitCastExpr(CastExpr *E) {
case CK_LValueBitCast:
case CK_UserDefinedConversion:
case CK_ResolveUnknownAnyType:
case CK_ResolveUnknownAnyTypeToReference:
return false;
case CK_LValueToRValue:
@ -2353,6 +2354,7 @@ bool ComplexExprEvaluator::VisitCastExpr(CastExpr *E) {
case CK_LValueBitCast:
case CK_UserDefinedConversion:
case CK_ResolveUnknownAnyType:
case CK_ResolveUnknownAnyTypeToReference:
return false;
case CK_FloatingRealToComplex: {

3
clang/lib/CodeGen/CGCXXABI.cpp
View File

@ -99,7 +99,8 @@ CGCXXABI::EmitNullMemberPointer(const MemberPointerType *MPT) {
return GetBogusMemberPointer(CGM, QualType(MPT, 0));
}
llvm::Constant *CGCXXABI::EmitMemberPointer(const CXXMethodDecl *MD) {
llvm::Constant *CGCXXABI::EmitMemberPointer(const CXXMethodDecl *MD,
QualType unknownType) {
return GetBogusMemberPointer(CGM,
CGM.getContext().getMemberPointerType(MD->getType(),
MD->getParent()->getTypeForDecl()));

7
clang/lib/CodeGen/CGCXXABI.h
View File

@ -119,7 +119,12 @@ public:
virtual llvm::Constant *EmitNullMemberPointer(const MemberPointerType *MPT);
/// Create a member pointer for the given method.
virtual llvm::Constant *EmitMemberPointer(const CXXMethodDecl *MD);
///
/// \param unknownType - if non-null, use this type as the operand
/// to CodeGenModule::getAddrOfUnknownAnyDecl instead of
/// fetching the method's address in the normal way
virtual llvm::Constant *EmitMemberPointer(const CXXMethodDecl *MD,
QualType unknownType = QualType());
/// Create a member pointer for the given field.
virtual llvm::Constant *EmitMemberDataPointer(const MemberPointerType *MPT,

40
clang/lib/CodeGen/CGExpr.cpp
View File

@ -1792,6 +1792,35 @@ EmitConditionalOperatorLValue(const AbstractConditionalOperator *expr) {
return MakeAddrLValue(phi, expr->getType());
}
static LValue emitUnknownAnyLValue(CodeGenFunction &CGF,
const Expr *operand,
QualType resolvedType) {
const ValueDecl *decl;
if (const DeclRefExpr *ref = dyn_cast<DeclRefExpr>(operand)) {
decl = ref->getDecl();
} else if (const MemberExpr *mem = dyn_cast<MemberExpr>(operand)) {
decl = mem->getMemberDecl();
// Emit (and ignore) the base.
if (mem->isArrow())
CGF.EmitScalarExpr(mem->getBase());
else
CGF.EmitLValue(mem->getBase());
} else {
llvm_unreachable("unexpected operand of unknown-any resolution!");
decl = 0;
}
llvm::Value *addr = CGF.CGM.getAddrOfUnknownAnyDecl(decl, resolvedType);
QualType type = resolvedType;
if (const ReferenceType *ref = type->getAs<ReferenceType>()) {
addr = CGF.Builder.CreateLoad(addr, "ref.value");
type = ref->getPointeeType();
}
return CGF.MakeAddrLValue(addr, type);
}
/// EmitCastLValue - Casts are never lvalues unless that cast is a dynamic_cast.
/// If the cast is a dynamic_cast, we can have the usual lvalue result,
/// otherwise if a cast is needed by the code generator in an lvalue context,
@ -1930,11 +1959,12 @@ LValue CodeGenFunction::EmitCastLValue(const CastExpr *E) {
ConvertType(ToType));
return MakeAddrLValue(V, E->getType());
}
case CK_ResolveUnknownAnyType: {
const DeclRefExpr *declRef = cast<DeclRefExpr>(E->getSubExpr());
llvm::Constant *addr = CGM.getAddrOfUnknownAnyDecl(declRef->getDecl(),
E->getType());
return MakeAddrLValue(addr, E->getType());
case CK_ResolveUnknownAnyType:
return emitUnknownAnyLValue(*this, E->getSubExpr(), E->getType());
case CK_ResolveUnknownAnyTypeToReference: {
// l-value vs. r-value reference type shouldn't matter here.
QualType type = getContext().getLValueReferenceType(E->getType());
return emitUnknownAnyLValue(*this, E->getSubExpr(), type);
}
}

1
clang/lib/CodeGen/CGExprAgg.cpp
View File

@ -311,6 +311,7 @@ void AggExprEmitter::VisitCastExpr(CastExpr *E) {
break;
case CK_ResolveUnknownAnyType:
case CK_ResolveUnknownAnyTypeToReference:
EmitAggLoadOfLValue(E);
break;

8
clang/lib/CodeGen/CGExprCXX.cpp
View File

@ -167,10 +167,12 @@ static bool canDevirtualizeMemberFunctionCalls(ASTContext &Context,
// extensions allowing explicit constructor function call.
RValue CodeGenFunction::EmitCXXMemberCallExpr(const CXXMemberCallExpr *CE,
ReturnValueSlot ReturnValue) {
if (isa<BinaryOperator>(CE->getCallee()->IgnoreParens()))
const Expr *callee = CE->getCallee()->IgnoreParens();
if (isa<BinaryOperator>(callee))
return EmitCXXMemberPointerCallExpr(CE, ReturnValue);
const MemberExpr *ME = cast<MemberExpr>(CE->getCallee()->IgnoreParens());
const MemberExpr *ME = cast<MemberExpr>(callee);
const CXXMethodDecl *MD = cast<CXXMethodDecl>(ME->getMemberDecl());
CGDebugInfo *DI = getDebugInfo();

1
clang/lib/CodeGen/CGExprConstant.cpp
View File

@ -553,6 +553,7 @@ public:
case CK_ToVoid:
case CK_Dynamic:
case CK_ResolveUnknownAnyType:
case CK_ResolveUnknownAnyTypeToReference:
return 0;
// These might need to be supported for constexpr.

13
clang/lib/CodeGen/CGExprScalar.cpp
View File

@ -1128,6 +1128,19 @@ Value *ScalarExprEmitter::EmitCastExpr(CastExpr *CE) {
}
case CK_ResolveUnknownAnyType:
// Special case: resolving a member pointer constant.
if (const UnaryOperator *uo = dyn_cast<UnaryOperator>(E)) {
DeclRefExpr *declRef = cast<DeclRefExpr>(uo->getSubExpr());
const CXXMethodDecl *method = cast<CXXMethodDecl>(declRef->getDecl());
const MemberPointerType *mpt = CE->getType()->castAs<MemberPointerType>();
QualType resolvedType = mpt->getPointeeType();
return CGF.CGM.getCXXABI().EmitMemberPointer(method, resolvedType);
}
// fallthrough
case CK_ResolveUnknownAnyTypeToReference:
return EmitLoadOfLValue(CE);
case CK_LValueToRValue:

35
clang/lib/CodeGen/ItaniumCXXABI.cpp
View File

@ -78,7 +78,8 @@ public:
llvm::Constant *EmitNullMemberPointer(const MemberPointerType *MPT);
llvm::Constant *EmitMemberPointer(const CXXMethodDecl *MD);
llvm::Constant *EmitMemberPointer(const CXXMethodDecl *MD,
QualType unknownType);
llvm::Constant *EmitMemberDataPointer(const MemberPointerType *MPT,
CharUnits offset);
@ -502,7 +503,8 @@ ItaniumCXXABI::EmitMemberDataPointer(const MemberPointerType *MPT,
return llvm::ConstantInt::get(getPtrDiffTy(), offset.getQuantity());
}
llvm::Constant *ItaniumCXXABI::EmitMemberPointer(const CXXMethodDecl *MD) {
llvm::Constant *ItaniumCXXABI::EmitMemberPointer(const CXXMethodDecl *MD,
QualType unknownType) {
assert(MD->isInstance() && "Member function must not be static!");
MD = MD->getCanonicalDecl();
@ -537,20 +539,27 @@ llvm::Constant *ItaniumCXXABI::EmitMemberPointer(const CXXMethodDecl *MD) {
MemPtr[1] = llvm::ConstantInt::get(ptrdiff_t, 0);
}
} else {
const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>();
const llvm::Type *Ty;
// Check whether the function has a computable LLVM signature.
if (!CodeGenTypes::VerifyFuncTypeComplete(FPT)) {
// The function has a computable LLVM signature; use the correct type.
Ty = Types.GetFunctionType(Types.getFunctionInfo(MD), FPT->isVariadic());
llvm::Constant *addr;
if (!unknownType.isNull()) {
addr = CGM.getAddrOfUnknownAnyDecl(MD, unknownType);
} else {
// Use an arbitrary non-function type to tell GetAddrOfFunction that the
// function type is incomplete.
Ty = ptrdiff_t;
QualType fnType = MD->getType();
const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>();
const llvm::Type *Ty;
// Check whether the function has a computable LLVM signature.
if (!CodeGenTypes::VerifyFuncTypeComplete(FPT)) {
// The function has a computable LLVM signature; use the correct type.
Ty = Types.GetFunctionType(Types.getFunctionInfo(MD),
FPT->isVariadic());
} else {
// Use an arbitrary non-function type to tell GetAddrOfFunction that the
// function type is incomplete.
Ty = ptrdiff_t;
}
addr = CGM.GetAddrOfFunction(MD, Ty);
}
llvm::Constant *Addr = CGM.GetAddrOfFunction(MD, Ty);
MemPtr[0] = llvm::ConstantExpr::getPtrToInt(Addr, ptrdiff_t);
MemPtr[0] = llvm::ConstantExpr::getPtrToInt(addr, ptrdiff_t);
MemPtr[1] = llvm::ConstantInt::get(ptrdiff_t, 0);
}

380
clang/lib/Sema/SemaExpr.cpp
View File

@ -4734,10 +4734,24 @@ static ExprResult rebuildUnknownAnyFunction(Sema &S, Expr *fn,
if (result.isInvalid()) return ExprError();
args[i] = result.take();
// Do l2r conversions on all the arguments.
S.DefaultLvalueConversion(args[i]);
QualType argType;
argTypes.push_back(args[i]->getType());
// If the argument is an explicit cast (possibly parenthesized),
// use that type exactly. This allows users to pass by reference.
if (ExplicitCastExpr *castExpr
= dyn_cast<ExplicitCastExpr>(args[i]->IgnoreParens())) {
argType = castExpr->getTypeAsWritten();
// Otherwise, do an l2r conversion on the argument before grabbing
// its type.
} else {
ExprResult result = S.DefaultLvalueConversion(args[i]);
if (result.isInvalid()) return ExprError();
args[i] = result.take();
argType = args[i]->getType();
}
argTypes.push_back(argType);
}
// Resolve the symbol to a function type that returns an unknown-any
@ -10145,6 +10159,10 @@ ExprResult Sema::ActOnBooleanCondition(Scope *S, SourceLocation Loc,
}
namespace {
/// A visitor for rebuilding an expression of type __unknown_anytype
/// into one which resolves the type directly on the referring
/// expression. Strict preservation of the original source
/// structure is not a goal.
struct RebuildUnknownAnyExpr
: StmtVisitor<RebuildUnknownAnyExpr, ExprResult> {
@ -10157,64 +10175,19 @@ namespace {
: S(S), DestType(castType) {}
ExprResult VisitStmt(Stmt *S) {
llvm_unreachable("unexpected expression kind!");
llvm_unreachable("unexpected statement!");
return ExprError();
}
ExprResult VisitCallExpr(CallExpr *call) {
Expr *callee = call->getCallee();
bool wasBlock;
QualType type = callee->getType();
if (const PointerType *ptr = type->getAs<PointerType>()) {
type = ptr->getPointeeType();
wasBlock = false;
} else {
type = type->castAs<BlockPointerType>()->getPointeeType();
wasBlock = true;
}
const FunctionType *fnType = type->castAs<FunctionType>();
// Verify that this is a legal result type of a function.
if (DestType->isArrayType() || DestType->isFunctionType()) {
unsigned diagID = diag::err_func_returning_array_function;
if (wasBlock) diagID = diag::err_block_returning_array_function;
S.Diag(call->getExprLoc(), diagID)
<< DestType->isFunctionType() << DestType;
return ExprError();
}
// Otherwise, go ahead and set DestType as the call's result.
call->setType(DestType.getNonLValueExprType(S.Context));
call->setValueKind(Expr::getValueKindForType(DestType));
assert(call->getObjectKind() == OK_Ordinary);
// Rebuild the function type, replacing the result type with DestType.
if (const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(fnType))
DestType = S.Context.getFunctionType(DestType,
proto->arg_type_begin(),
proto->getNumArgs(),
proto->getExtProtoInfo());
else
DestType = S.Context.getFunctionNoProtoType(DestType,
fnType->getExtInfo());
// Rebuild the appropriate pointer-to-function type.
if (wasBlock)
DestType = S.Context.getBlockPointerType(DestType);
else
DestType = S.Context.getPointerType(DestType);
// Finally, we can recurse.
ExprResult calleeResult = Visit(callee);
if (!calleeResult.isUsable()) return ExprError();
call->setCallee(calleeResult.take());
// Bind a temporary if necessary.
return S.MaybeBindToTemporary(call);
ExprResult VisitExpr(Expr *expr) {
S.Diag(expr->getExprLoc(), diag::err_unsupported_unknown_any_expr)
<< expr->getSourceRange();
return ExprError();
}
ExprResult VisitCallExpr(CallExpr *call);
ExprResult VisitObjCMessageExpr(ObjCMessageExpr *message);
/// Rebuild an expression which simply semantically wraps another
/// expression which it shares the type and value kind of.
template <class T> ExprResult rebuildSugarExpr(T *expr) {
@ -10236,47 +10209,245 @@ namespace {
return rebuildSugarExpr(op);
}
ExprResult VisitImplicitCastExpr(ImplicitCastExpr *ice) {
// Rebuild an inner resolution by stripping it and propagating
// the new type down.
if (ice->getCastKind() == CK_ResolveUnknownAnyType)
return Visit(ice->getSubExpr());
ExprResult VisitImplicitCastExpr(ImplicitCastExpr *ice);
// The only other case we should be able to get here is a
// function-to-pointer decay.
assert(ice->getCastKind() == CK_FunctionToPointerDecay);
ice->setType(DestType);
assert(ice->getValueKind() == VK_RValue);
assert(ice->getObjectKind() == OK_Ordinary);
ExprResult resolveDecl(Expr *expr, NamedDecl *decl);
// Rebuild the sub-expression as the pointee (function) type.
DestType = DestType->castAs<PointerType>()->getPointeeType();
ExprResult result = Visit(ice->getSubExpr());
if (!result.isUsable()) return ExprError();
ice->setSubExpr(result.take());
return S.Owned(ice);
}
ExprResult VisitMemberExpr(MemberExpr *mem);
ExprResult VisitDeclRefExpr(DeclRefExpr *ref) {
ExprValueKind valueKind = VK_LValue;
if (S.getLangOptions().CPlusPlus) {
// FIXME: if the value was resolved as a reference type, we
// should really remember that somehow, or else we'll be
// missing a load.
DestType = DestType.getNonReferenceType();
} else if (DestType->isFunctionType()) {
valueKind = VK_RValue;
}
return S.Owned(ImplicitCastExpr::Create(S.Context, DestType,
CK_ResolveUnknownAnyType,
ref, 0, valueKind));
return resolveDecl(ref, ref->getDecl());
}
};
}
/// Rebuilds a call expression which yielded __unknown_anytype.
ExprResult RebuildUnknownAnyExpr::VisitCallExpr(CallExpr *call) {
Expr *callee = call->getCallee();
enum FnKind {
FK_Function,
FK_FunctionPointer,
FK_BlockPointer
};
FnKind kind;
QualType type = callee->getType();
if (type->isFunctionType()) {
assert(isa<CXXMemberCallExpr>(call) || isa<CXXOperatorCallExpr>(call));
kind = FK_Function;
} else if (const PointerType *ptr = type->getAs<PointerType>()) {
type = ptr->getPointeeType();
kind = FK_FunctionPointer;
} else {
type = type->castAs<BlockPointerType>()->getPointeeType();
kind = FK_BlockPointer;
}
const FunctionType *fnType = type->castAs<FunctionType>();
// Verify that this is a legal result type of a function.
if (DestType->isArrayType() || DestType->isFunctionType()) {
unsigned diagID = diag::err_func_returning_array_function;
if (kind == FK_BlockPointer)
diagID = diag::err_block_returning_array_function;
S.Diag(call->getExprLoc(), diagID)
<< DestType->isFunctionType() << DestType;
return ExprError();
}
// Otherwise, go ahead and set DestType as the call's result.
call->setType(DestType.getNonLValueExprType(S.Context));
call->setValueKind(Expr::getValueKindForType(DestType));
assert(call->getObjectKind() == OK_Ordinary);
// Rebuild the function type, replacing the result type with DestType.
if (const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(fnType))
DestType = S.Context.getFunctionType(DestType,
proto->arg_type_begin(),
proto->getNumArgs(),
proto->getExtProtoInfo());
else
DestType = S.Context.getFunctionNoProtoType(DestType,
fnType->getExtInfo());
// Rebuild the appropriate pointer-to-function type.
switch (kind) {
case FK_Function:
// Nothing to do.
break;
case FK_FunctionPointer:
DestType = S.Context.getPointerType(DestType);
break;
case FK_BlockPointer:
DestType = S.Context.getBlockPointerType(DestType);
break;
}
// Finally, we can recurse.
ExprResult calleeResult = Visit(callee);
if (!calleeResult.isUsable()) return ExprError();
call->setCallee(calleeResult.take());
// Bind a temporary if necessary.
return S.MaybeBindToTemporary(call);
}
ExprResult RebuildUnknownAnyExpr::VisitObjCMessageExpr(ObjCMessageExpr *msg) {
// This is a long series of hacks around the problem that:
// - we can't just cast the method because it's not an expr,
// - we don't want to modify it in place, and
// - there's no way to override the declared result type
// of a method on a per-call basis.
const ReferenceType *refTy = DestType->getAs<ReferenceType>();
if (refTy) {
// Hack 1: if we're returning a reference, make the message
// send return a pointer instead.
DestType = S.Context.getPointerType(refTy->getPointeeType());
}
// Change the type of the message.
msg->setType(DestType);
assert(msg->getValueKind() == VK_RValue);
// Hack 2: remove the method decl so that clients won't just
// ignore the expression's type. This is imperfect and can lead
// to expressions being completely lost.
msg->setSelector(msg->getMethodDecl()->getSelector());
// Hack 3: if we're returning a reference, dereference the
// pointer return.
Expr *result = msg;
if (refTy) {
SourceLocation loc;
result = new (S.Context) UnaryOperator(result, UO_Deref,
refTy->getPointeeType(),
VK_LValue, OK_Ordinary, loc);
// Hack 4: if we're returning an *rvalue* reference, cast to that.
if (isa<RValueReferenceType>(refTy)) {
TypeSourceInfo *tsi =
S.Context.getTrivialTypeSourceInfo(QualType(refTy, 0), loc);
result = CStyleCastExpr::Create(S.Context, refTy->getPointeeType(),
VK_XValue, CK_LValueBitCast,
result, 0, tsi, loc, loc);
}
}
return S.MaybeBindToTemporary(result);
}
ExprResult RebuildUnknownAnyExpr::VisitImplicitCastExpr(ImplicitCastExpr *ice) {
// Rebuild an inner resolution by stripping it and propagating
// the new type down.
if (ice->getCastKind() == CK_ResolveUnknownAnyType)
return Visit(ice->getSubExpr());
// The only other case we should be able to get here is a
// function-to-pointer decay.
assert(ice->getCastKind() == CK_FunctionToPointerDecay);
ice->setType(DestType);
assert(ice->getValueKind() == VK_RValue);
assert(ice->getObjectKind() == OK_Ordinary);
// Rebuild the sub-expression as the pointee (function) type.
DestType = DestType->castAs<PointerType>()->getPointeeType();
ExprResult result = Visit(ice->getSubExpr());
if (!result.isUsable()) return ExprError();
ice->setSubExpr(result.take());
return S.Owned(ice);
}
ExprResult RebuildUnknownAnyExpr::resolveDecl(Expr *expr, NamedDecl *decl) {
ExprValueKind valueKind = VK_LValue;
CastKind castKind = CK_ResolveUnknownAnyType;
QualType type = DestType;
// We know how to make this work for certain kinds of decls:
// - functions
if (isa<FunctionDecl>(decl)) {
if (CXXMethodDecl *method = dyn_cast<CXXMethodDecl>(decl))
if (method->isInstance()) valueKind = VK_RValue;
// This is true because FunctionDecls must always have function
// type, so we can't be resolving the entire thing at once.
assert(type->isFunctionType());
// Function references aren't l-values in C.
if (!S.getLangOptions().CPlusPlus)
valueKind = VK_RValue;
// - variables
} else if (isa<VarDecl>(decl)) {
if (S.getLangOptions().CPlusPlus) {
// If we're resolving to a reference type, the type of the
// expression is the pointee type, and we need to use a
// different cast kind so that we know to do the extra load.
if (const ReferenceType *refTy = type->getAs<ReferenceType>()) {
type = refTy->getPointeeType();
castKind = CK_ResolveUnknownAnyTypeToReference;
}
} else if (type->isFunctionType()) {
// Function references aren't l-values in C.
valueKind = VK_RValue;
}
// - nothing else
} else {
S.Diag(expr->getExprLoc(), diag::err_unsupported_unknown_any_decl)
<< decl << expr->getSourceRange();
return ExprError();
}
return S.Owned(ImplicitCastExpr::Create(S.Context, type, castKind,
expr, 0, valueKind));
}
ExprResult RebuildUnknownAnyExpr::VisitMemberExpr(MemberExpr *mem) {
NamedDecl *decl = mem->getMemberDecl();
CXXMethodDecl *method = dyn_cast<CXXMethodDecl>(decl);
if (!method || !method->isInstance())
return resolveDecl(mem, decl);
// Rebuild instance-method references as applications of .* or ->*.
Expr *base = mem->getBase();
assert(DestType->isFunctionType());
// Make a decl ref.
TemplateArgumentListInfo explicitArgs;
mem->copyTemplateArgumentsInto(explicitArgs);
Expr *rhs = DeclRefExpr::Create(S.Context, mem->getQualifierLoc(),
method, mem->getMemberNameInfo(),
method->getType(), VK_RValue, &explicitArgs);
// Turn that into a member pointer constant.
const Type *recordTy =
S.Context.getTypeDeclType(method->getParent()).getTypePtr();
QualType mpt = S.Context.getMemberPointerType(method->getType(), recordTy);
rhs = new (S.Context) UnaryOperator(rhs, UO_AddrOf, mpt, VK_RValue,
OK_Ordinary, SourceLocation());
// Resolve that.
rhs = ImplicitCastExpr::Create(S.Context,
S.Context.getMemberPointerType(DestType, recordTy),
CK_ResolveUnknownAnyType, rhs, 0, VK_RValue);
// Turn that into a binary .* or ->*.
Expr *result = new (S.Context) BinaryOperator(base, rhs,
mem->isArrow() ? BO_PtrMemI : BO_PtrMemD,
DestType, VK_RValue,
OK_Ordinary, SourceLocation());
return S.Owned(result);
}
/// Check a cast of an unknown-any type. We intentionally only
/// trigger this for C-style casts.
ExprResult Sema::checkUnknownAnyCast(SourceRange typeRange, QualType castType,
@ -10295,18 +10466,37 @@ ExprResult Sema::checkUnknownAnyCast(SourceRange typeRange, QualType castType,
static ExprResult diagnoseUnknownAnyExpr(Sema &S, Expr *e) {
Expr *orig = e;
unsigned diagID = diag::err_uncasted_use_of_unknown_any;
while (true) {
e = e->IgnoreParenImpCasts();
if (CallExpr *call = dyn_cast<CallExpr>(e))
if (CallExpr *call = dyn_cast<CallExpr>(e)) {
e = call->getCallee();
else
diagID = diag::err_uncasted_call_of_unknown_any;
} else {
break;
}
}
assert(isa<DeclRefExpr>(e) && "unexpected form of unknown-any expression");
DeclRefExpr *ref = cast<DeclRefExpr>(e);
S.Diag(ref->getLocation(), diag::err_bad_use_of_unknown_any)
<< ref->getDecl() << orig->getSourceRange();
SourceLocation loc;
NamedDecl *d;
if (DeclRefExpr *ref = dyn_cast<DeclRefExpr>(e)) {
loc = ref->getLocation();
d = ref->getDecl();
} else if (MemberExpr *mem = dyn_cast<MemberExpr>(e)) {
loc = mem->getMemberLoc();
d = mem->getMemberDecl();
} else if (ObjCMessageExpr *msg = dyn_cast<ObjCMessageExpr>(e)) {
diagID = diag::err_uncasted_call_of_unknown_any;
loc = msg->getSelectorLoc();
d = msg->getMethodDecl();
assert(d && "unknown method returning __unknown_any?");
} else {
S.Diag(e->getExprLoc(), diag::err_unsupported_unknown_any_expr)
<< e->getSourceRange();
return ExprError();
}
S.Diag(loc, diagID) << d << orig->getSourceRange();
// Never recoverable.
return ExprError();

1
clang/lib/StaticAnalyzer/Core/ExprEngine.cpp
View File

@ -2177,6 +2177,7 @@ void ExprEngine::VisitCast(const CastExpr *CastE, const Expr *Ex,
}
// Various C++ casts that are not handled yet.
case CK_ResolveUnknownAnyType:
case CK_ResolveUnknownAnyTypeToReference:
case CK_Dynamic:
case CK_ToUnion:
case CK_BaseToDerived:

19
clang/test/CodeGenCXX/unknown-anytype.cpp
View File

@ -55,3 +55,22 @@ Test7 test7() {
// CHECK: call void @test7_any({{%.*}}* sret {{%.*}}, i32 5)
return (Test7) test7_any(5);
}
struct Test8 {
__unknown_anytype foo();
__unknown_anytype foo(int);
void test();
};
void Test8::test() {
(int) foo();
(int) foo(5);
(float) this->foo();
(float) this->foo(5);
}
void test8(Test8 *p) {
(double) p->foo();
(double) p->foo(5);
(bool) (*p).foo();
(bool) (*p).foo(5);
}

9
clang/test/SemaCXX/unknown-anytype.cpp
View File

@ -15,7 +15,14 @@ namespace test1 {
// properly.
int x = foo; // expected-error {{cannot initialize}}
int y = 0 + foo; // expected-error {{no known type for 'foo'; must explicitly cast this expression to use it}}
int y = 0 + foo; // expected-error {{'foo' has unknown type}}
return foo; // expected-error {{cannot initialize}}
}
}
namespace test2 {
extern __unknown_anytype foo();
void test() {
foo(); // expected-error {{'foo' has unknown return type}}
}
}