Allow taking the address of data members, resulting in a member pointer.
Pointers to functions don't work yet, and pointers to overloaded functions even less. Also, far too much illegal code is accepted.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@63655 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/ParseExpr.cpp b/lib/Parse/ParseExpr.cpp
index c4df632..64c4c31 100644
--- a/lib/Parse/ParseExpr.cpp
+++ b/lib/Parse/ParseExpr.cpp
@@ -345,7 +345,9 @@
}
/// ParseCastExpression - Parse a cast-expression, or, if isUnaryExpression is
-/// true, parse a unary-expression.
+/// true, parse a unary-expression. isAddressOfOperand exists because an
+/// id-expression that is the operand of address-of gets special treatment
+/// due to member pointers.
///
/// cast-expression: [C99 6.5.4]
/// unary-expression
@@ -451,7 +453,8 @@
/// [GNU] binary-type-trait:
/// '__is_base_of' [TODO]
///
-Parser::OwningExprResult Parser::ParseCastExpression(bool isUnaryExpression) {
+Parser::OwningExprResult Parser::ParseCastExpression(bool isUnaryExpression,
+ bool isAddressOfOperand) {
OwningExprResult Res(Actions);
tok::TokenKind SavedKind = Tok.getKind();
@@ -522,7 +525,7 @@
if (getLang().CPlusPlus) {
// If TryAnnotateTypeOrScopeToken annotates the token, tail recurse.
if (TryAnnotateTypeOrScopeToken())
- return ParseCastExpression(isUnaryExpression);
+ return ParseCastExpression(isUnaryExpression, isAddressOfOperand);
}
// Consume the identifier so that we can see if it is followed by a '('.
@@ -570,7 +573,15 @@
Res = Actions.ActOnUnaryOp(CurScope, SavedLoc, SavedKind, move_arg(Res));
return move(Res);
}
- case tok::amp: // unary-expression: '&' cast-expression
+ case tok::amp: { // unary-expression: '&' cast-expression
+ // Special treatment because of member pointers
+ SourceLocation SavedLoc = ConsumeToken();
+ Res = ParseCastExpression(false, true);
+ if (!Res.isInvalid())
+ Res = Actions.ActOnUnaryOp(CurScope, SavedLoc, SavedKind, move_arg(Res));
+ return move(Res);
+ }
+
case tok::star: // unary-expression: '*' cast-expression
case tok::plus: // unary-expression: '+' cast-expression
case tok::minus: // unary-expression: '-' cast-expression
@@ -662,15 +673,15 @@
case tok::annot_cxxscope: // [C++] id-expression: qualified-id
case tok::kw_operator: // [C++] id-expression: operator/conversion-function-id
// template-id
- Res = ParseCXXIdExpression();
+ Res = ParseCXXIdExpression(isAddressOfOperand);
return ParsePostfixExpressionSuffix(move(Res));
case tok::coloncolon: {
// ::foo::bar -> global qualified name etc. If TryAnnotateTypeOrScopeToken
// annotates the token, tail recurse.
if (TryAnnotateTypeOrScopeToken())
- return ParseCastExpression(isUnaryExpression);
-
+ return ParseCastExpression(isUnaryExpression, isAddressOfOperand);
+
// ::new -> [C++] new-expression
// ::delete -> [C++] delete-expression
SourceLocation CCLoc = ConsumeToken();
diff --git a/lib/Parse/ParseExprCXX.cpp b/lib/Parse/ParseExprCXX.cpp
index f434cfb..1efa274 100644
--- a/lib/Parse/ParseExprCXX.cpp
+++ b/lib/Parse/ParseExprCXX.cpp
@@ -131,7 +131,12 @@
/// That way Sema can handle and report similar errors for namespaces and the
/// global scope.
///
-Parser::OwningExprResult Parser::ParseCXXIdExpression() {
+/// The isAddressOfOperand parameter indicates that this id-expression is a
+/// direct operand of the address-of operator. This is, besides member contexts,
+/// the only place where a qualified-id naming a non-static class member may
+/// appear.
+///
+Parser::OwningExprResult Parser::ParseCXXIdExpression(bool isAddressOfOperand) {
// qualified-id:
// '::'[opt] nested-name-specifier 'template'[opt] unqualified-id
// '::' unqualified-id
@@ -154,18 +159,20 @@
// Consume the identifier so that we can see if it is followed by a '('.
IdentifierInfo &II = *Tok.getIdentifierInfo();
SourceLocation L = ConsumeToken();
- return Actions.ActOnIdentifierExpr(CurScope, L, II,
- Tok.is(tok::l_paren), &SS);
+ return Actions.ActOnIdentifierExpr(CurScope, L, II, Tok.is(tok::l_paren),
+ &SS, isAddressOfOperand);
}
case tok::kw_operator: {
SourceLocation OperatorLoc = Tok.getLocation();
if (OverloadedOperatorKind Op = TryParseOperatorFunctionId())
return Actions.ActOnCXXOperatorFunctionIdExpr(
- CurScope, OperatorLoc, Op, Tok.is(tok::l_paren), SS);
+ CurScope, OperatorLoc, Op, Tok.is(tok::l_paren), SS,
+ isAddressOfOperand);
if (TypeTy *Type = ParseConversionFunctionId())
return Actions.ActOnCXXConversionFunctionExpr(CurScope, OperatorLoc, Type,
- Tok.is(tok::l_paren), SS);
+ Tok.is(tok::l_paren), SS,
+ isAddressOfOperand);
// We already complained about a bad conversion-function-id,
// above.
diff --git a/lib/Sema/Sema.h b/lib/Sema/Sema.h
index 0969cd0..6360dcc 100644
--- a/lib/Sema/Sema.h
+++ b/lib/Sema/Sema.h
@@ -1030,17 +1030,20 @@
virtual OwningExprResult ActOnIdentifierExpr(Scope *S, SourceLocation Loc,
IdentifierInfo &II,
bool HasTrailingLParen,
- const CXXScopeSpec *SS = 0);
+ const CXXScopeSpec *SS = 0,
+ bool isAddressOfOperand = false);
virtual OwningExprResult ActOnCXXOperatorFunctionIdExpr(Scope *S,
SourceLocation OperatorLoc,
OverloadedOperatorKind Op,
bool HasTrailingLParen,
- const CXXScopeSpec &SS);
+ const CXXScopeSpec &SS,
+ bool isAddressOfOperand);
virtual OwningExprResult ActOnCXXConversionFunctionExpr(Scope *S,
SourceLocation OperatorLoc,
TypeTy *Ty,
bool HasTrailingLParen,
- const CXXScopeSpec &SS);
+ const CXXScopeSpec &SS,
+ bool isAddressOfOperand);
DeclRefExpr *BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc,
bool TypeDependent, bool ValueDependent,
const CXXScopeSpec *SS = 0);
@@ -1053,7 +1056,8 @@
DeclarationName Name,
bool HasTrailingLParen,
const CXXScopeSpec *SS,
- bool ForceResolution = false);
+ bool ForceResolution = false,
+ bool isAddressOfOperand = false);
virtual OwningExprResult ActOnPredefinedExpr(SourceLocation Loc,
tok::TokenKind Kind);
diff --git a/lib/Sema/SemaExpr.cpp b/lib/Sema/SemaExpr.cpp
index ddd5349..36107e8 100644
--- a/lib/Sema/SemaExpr.cpp
+++ b/lib/Sema/SemaExpr.cpp
@@ -363,16 +363,19 @@
Sema::OwningExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc,
IdentifierInfo &II,
bool HasTrailingLParen,
- const CXXScopeSpec *SS) {
- return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS);
+ const CXXScopeSpec *SS,
+ bool isAddressOfOperand) {
+ return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS,
+ /*ForceResolution*/false, isAddressOfOperand);
}
/// BuildDeclRefExpr - Build either a DeclRefExpr or a
/// QualifiedDeclRefExpr based on whether or not SS is a
/// nested-name-specifier.
-DeclRefExpr *Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc,
- bool TypeDependent, bool ValueDependent,
- const CXXScopeSpec *SS) {
+DeclRefExpr *
+Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc,
+ bool TypeDependent, bool ValueDependent,
+ const CXXScopeSpec *SS) {
if (SS && !SS->isEmpty())
return new (Context) QualifiedDeclRefExpr(D, Ty, Loc, TypeDependent,
ValueDependent, SS->getRange().getBegin());
@@ -535,10 +538,16 @@
/// If ForceResolution is true, then we will attempt to resolve the
/// name even if it looks like a dependent name. This option is off by
/// default.
+///
+/// isAddressOfOperand means that this expression is the direct operand
+/// of an address-of operator. This matters because this is the only
+/// situation where a qualified name referencing a non-static member may
+/// appear outside a member function of this class.
Sema::OwningExprResult
Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc,
DeclarationName Name, bool HasTrailingLParen,
- const CXXScopeSpec *SS, bool ForceResolution) {
+ const CXXScopeSpec *SS, bool ForceResolution,
+ bool isAddressOfOperand) {
if (S->getTemplateParamParent() && Name.getAsIdentifierInfo() &&
HasTrailingLParen && !SS && !ForceResolution) {
// We've seen something of the form
@@ -554,11 +563,11 @@
}
// Could be enum-constant, value decl, instance variable, etc.
- Decl *D = 0;
if (SS && SS->isInvalid())
return ExprError();
LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName);
+ Decl *D = 0;
if (Lookup.isAmbiguous()) {
DiagnoseAmbiguousLookup(Lookup, Name, Loc,
SS && SS->isSet() ? SS->getRange()
@@ -618,6 +627,41 @@
}
}
+ // If this is an expression of the form &Class::member, don't build an
+ // implicit member ref, because we want a pointer to the member in general,
+ // not any specific instance's member.
+ if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) {
+ NamedDecl *ND = dyn_cast<NamedDecl>(D);
+ DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep());
+ if (ND && isa<CXXRecordDecl>(DC)) {
+ QualType DType;
+ if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) {
+ DType = FD->getType().getNonReferenceType();
+ } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
+ DType = Method->getType();
+ } else if (isa<OverloadedFunctionDecl>(D)) {
+ DType = Context.OverloadTy;
+ }
+ // Could be an inner type. That's diagnosed below, so ignore it here.
+ if (!DType.isNull()) {
+ // The pointer is type- and value-dependent if it points into something
+ // dependent.
+ bool Dependent = false;
+ for (; DC; DC = DC->getParent()) {
+ // FIXME: could stop early at namespace scope.
+ if (DC->isRecord()) {
+ CXXRecordDecl *Record = cast<CXXRecordDecl>(DC);
+ if (Context.getTypeDeclType(Record)->isDependentType()) {
+ Dependent = true;
+ break;
+ }
+ }
+ }
+ return Owned(BuildDeclRefExpr(ND, DType, Loc, Dependent, Dependent,SS));
+ }
+ }
+ }
+
// We may have found a field within an anonymous union or struct
// (C++ [class.union]).
if (FieldDecl *FD = dyn_cast<FieldDecl>(D))
@@ -3428,6 +3472,14 @@
return Context.OverloadTy;
} else if (isa<FieldDecl>(dcl)) {
// Okay: we can take the address of a field.
+ // Could be a pointer to member, though, if there is an explicit
+ // scope qualifier for the class.
+ if (isa<QualifiedDeclRefExpr>(op)) {
+ DeclContext *Ctx = dcl->getDeclContext();
+ if (Ctx && Ctx->isRecord())
+ return Context.getMemberPointerType(op->getType(),
+ Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr());
+ }
} else if (isa<FunctionDecl>(dcl)) {
// Okay: we can take the address of a function.
}
diff --git a/lib/Sema/SemaExprCXX.cpp b/lib/Sema/SemaExprCXX.cpp
index 3c8184d..e9dbc84 100644
--- a/lib/Sema/SemaExprCXX.cpp
+++ b/lib/Sema/SemaExprCXX.cpp
@@ -28,13 +28,14 @@
Sema::OwningExprResult
Sema::ActOnCXXConversionFunctionExpr(Scope *S, SourceLocation OperatorLoc,
TypeTy *Ty, bool HasTrailingLParen,
- const CXXScopeSpec &SS) {
+ const CXXScopeSpec &SS,
+ bool isAddressOfOperand) {
QualType ConvType = QualType::getFromOpaquePtr(Ty);
QualType ConvTypeCanon = Context.getCanonicalType(ConvType);
DeclarationName ConvName
= Context.DeclarationNames.getCXXConversionFunctionName(ConvTypeCanon);
return ActOnDeclarationNameExpr(S, OperatorLoc, ConvName, HasTrailingLParen,
- &SS);
+ &SS, /*ForceRes*/false, isAddressOfOperand);
}
/// ActOnCXXOperatorFunctionIdExpr - Parse a C++ overloaded operator
@@ -46,9 +47,11 @@
Sema::ActOnCXXOperatorFunctionIdExpr(Scope *S, SourceLocation OperatorLoc,
OverloadedOperatorKind Op,
bool HasTrailingLParen,
- const CXXScopeSpec &SS) {
+ const CXXScopeSpec &SS,
+ bool isAddressOfOperand) {
DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(Op);
- return ActOnDeclarationNameExpr(S, OperatorLoc, Name, HasTrailingLParen, &SS);
+ return ActOnDeclarationNameExpr(S, OperatorLoc, Name, HasTrailingLParen, &SS,
+ /*ForceRes*/false, isAddressOfOperand);
}
/// ActOnCXXTypeidOfType - Parse typeid( type-id ).