/// ParseInitializerWithPotentialDesignator - Parse the 'initializer' production
/// checking to see if the token stream starts with a designator.
///
/// designation:
/// designator-list '='
/// [GNU] array-designator
/// [GNU] identifier ':'
///
/// designator-list:
/// designator
/// designator-list designator
///
/// designator:
/// array-designator
/// '.' identifier
///
/// array-designator:
/// '[' constant-expression ']'
/// [GNU] '[' constant-expression '...' constant-expression ']'
///
/// NOTE: [OBC] allows '[ objc-receiver objc-message-args ]' as an
/// initializer (because it is an expression). We need to consider this case
/// when parsing array designators.
///
ExprResult Parser::ParseInitializerWithPotentialDesignator() {
// If this is the old-style GNU extension:
// designation ::= identifier ':'
// Handle it as a field designator. Otherwise, this must be the start of a
// normal expression.
if (Tok.is(tok::identifier)) {
const IdentifierInfo *FieldName = Tok.getIdentifierInfo();
SmallString<256> NewSyntax;
llvm::raw_svector_ostream(NewSyntax) << '.' << FieldName->getName()
<< " = ";
SourceLocation NameLoc = ConsumeToken(); // Eat the identifier.
assert(Tok.is(tok::colon) && "MayBeDesignationStart not working properly!");
SourceLocation ColonLoc = ConsumeToken();
Diag(NameLoc, diag::ext_gnu_old_style_field_designator)
<< FixItHint::CreateReplacement(SourceRange(NameLoc, ColonLoc),
NewSyntax.str());
Designation D;
D.AddDesignator(Designator::getField(FieldName, SourceLocation(), NameLoc));
return Actions.ActOnDesignatedInitializer(D, ColonLoc, true,
ParseInitializer());
}
// Desig - This is initialized when we see our first designator. We may have
// an objc message send with no designator, so we don't want to create this
// eagerly.
Designation Desig;
// Parse each designator in the designator list until we find an initializer.
while (Tok.is(tok::period) || Tok.is(tok::l_square)) {
if (Tok.is(tok::period)) {
// designator: '.' identifier
SourceLocation DotLoc = ConsumeToken();
if (Tok.isNot(tok::identifier)) {
Diag(Tok.getLocation(), diag::err_expected_field_designator);
return ExprError();
}
Desig.AddDesignator(Designator::getField(Tok.getIdentifierInfo(), DotLoc,
Tok.getLocation()));
ConsumeToken(); // Eat the identifier.
continue;
}
// We must have either an array designator now or an objc message send.
assert(Tok.is(tok::l_square) && "Unexpected token!");
// Handle the two forms of array designator:
// array-designator: '[' constant-expression ']'
// array-designator: '[' constant-expression '...' constant-expression ']'
//
// Also, we have to handle the case where the expression after the
// designator an an objc message send: '[' objc-message-expr ']'.
// Interesting cases are:
// [foo bar] -> objc message send
// [foo] -> array designator
// [foo ... bar] -> array designator
// [4][foo bar] -> obsolete GNU designation with objc message send.
//
// We do not need to check for an expression starting with [[ here. If it
// contains an Objective-C message send, then it is not an ill-formed
// attribute. If it is a lambda-expression within an array-designator, then
// it will be rejected because a constant-expression cannot begin with a
// lambda-expression.
InMessageExpressionRAIIObject InMessage(*this, true);
BalancedDelimiterTracker T(*this, tok::l_square);
T.consumeOpen();
SourceLocation StartLoc = T.getOpenLocation();
ExprResult Idx;
// If Objective-C is enabled and this is a typename (class message
// send) or send to 'super', parse this as a message send
// expression. We handle C++ and C separately, since C++ requires
// much more complicated parsing.
if (getLangOpts().ObjC1 && getLangOpts().CPlusPlus) {
// Send to 'super'.
if (Tok.is(tok::identifier) && Tok.getIdentifierInfo() == Ident_super &&
NextToken().isNot(tok::period) &&
getCurScope()->isInObjcMethodScope()) {
CheckArrayDesignatorSyntax(*this, StartLoc, Desig);
return ParseAssignmentExprWithObjCMessageExprStart(StartLoc,
ConsumeToken(),
ParsedType(),
0);
}
// Parse the receiver, which is either a type or an expression.
bool IsExpr;
void *TypeOrExpr;
if (ParseObjCXXMessageReceiver(IsExpr, TypeOrExpr)) {
SkipUntil(tok::r_square, StopAtSemi);
return ExprError();
}
// If the receiver was a type, we have a class message; parse
// the rest of it.
if (!IsExpr) {
CheckArrayDesignatorSyntax(*this, StartLoc, Desig);
return ParseAssignmentExprWithObjCMessageExprStart(StartLoc,
SourceLocation(),
ParsedType::getFromOpaquePtr(TypeOrExpr),
0);
}
// If the receiver was an expression, we still don't know
// whether we have a message send or an array designator; just
// adopt the expression for further analysis below.
// FIXME: potentially-potentially evaluated expression above?
Idx = ExprResult(static_cast<Expr*>(TypeOrExpr));
} else if (getLangOpts().ObjC1 && Tok.is(tok::identifier)) {
IdentifierInfo *II = Tok.getIdentifierInfo();
SourceLocation IILoc = Tok.getLocation();
ParsedType ReceiverType;
// Three cases. This is a message send to a type: [type foo]
// This is a message send to super: [super foo]
// This is a message sent to an expr: [super.bar foo]
switch (Sema::ObjCMessageKind Kind
= Actions.getObjCMessageKind(getCurScope(), II, IILoc,
II == Ident_super,
NextToken().is(tok::period),
ReceiverType)) {
case Sema::ObjCSuperMessage:
case Sema::ObjCClassMessage:
CheckArrayDesignatorSyntax(*this, StartLoc, Desig);
if (Kind == Sema::ObjCSuperMessage)
return ParseAssignmentExprWithObjCMessageExprStart(StartLoc,
ConsumeToken(),
ParsedType(),
0);
ConsumeToken(); // the identifier
if (!ReceiverType) {
SkipUntil(tok::r_square, StopAtSemi);
return ExprError();
}
return ParseAssignmentExprWithObjCMessageExprStart(StartLoc,
SourceLocation(),
ReceiverType,
0);
case Sema::ObjCInstanceMessage:
// Fall through; we'll just parse the expression and
// (possibly) treat this like an Objective-C message send
// later.
break;
}
}
// Parse the index expression, if we haven't already gotten one
// above (which can only happen in Objective-C++).
// Note that we parse this as an assignment expression, not a constant
// expression (allowing *=, =, etc) to handle the objc case. Sema needs
// to validate that the expression is a constant.
// FIXME: We also need to tell Sema that we're in a
// potentially-potentially evaluated context.
if (!Idx.get()) {
Idx = ParseAssignmentExpression();
if (Idx.isInvalid()) {
SkipUntil(tok::r_square, StopAtSemi);
return Idx;
}
}
// Given an expression, we could either have a designator (if the next
// tokens are '...' or ']' or an objc message send. If this is an objc
// message send, handle it now. An objc-message send is the start of
// an assignment-expression production.
if (getLangOpts().ObjC1 && Tok.isNot(tok::ellipsis) &&
Tok.isNot(tok::r_square)) {
CheckArrayDesignatorSyntax(*this, Tok.getLocation(), Desig);
return ParseAssignmentExprWithObjCMessageExprStart(StartLoc,
SourceLocation(),
ParsedType(),
Idx.take());
}
// If this is a normal array designator, remember it.
if (Tok.isNot(tok::ellipsis)) {
Desig.AddDesignator(Designator::getArray(Idx.release(), StartLoc));
} else {
// Handle the gnu array range extension.
Diag(Tok, diag::ext_gnu_array_range);
SourceLocation EllipsisLoc = ConsumeToken();
ExprResult RHS(ParseConstantExpression());
if (RHS.isInvalid()) {
SkipUntil(tok::r_square, StopAtSemi);
return RHS;
}
Desig.AddDesignator(Designator::getArrayRange(Idx.release(),
RHS.release(),
StartLoc, EllipsisLoc));
}
T.consumeClose();
Desig.getDesignator(Desig.getNumDesignators() - 1).setRBracketLoc(
T.getCloseLocation());
}
// Okay, we're done with the designator sequence. We know that there must be
// at least one designator, because the only case we can get into this method
// without a designator is when we have an objc message send. That case is
// handled and returned from above.
assert(!Desig.empty() && "Designator is empty?");
// Handle a normal designator sequence end, which is an equal.
if (Tok.is(tok::equal)) {
SourceLocation EqualLoc = ConsumeToken();
return Actions.ActOnDesignatedInitializer(Desig, EqualLoc, false,
ParseInitializer());
}
// We read some number of designators and found something that isn't an = or
// an initializer. If we have exactly one array designator, this
// is the GNU 'designation: array-designator' extension. Otherwise, it is a
// parse error.
if (Desig.getNumDesignators() == 1 &&
(Desig.getDesignator(0).isArrayDesignator() ||
Desig.getDesignator(0).isArrayRangeDesignator())) {
Diag(Tok, diag::ext_gnu_missing_equal_designator)
<< FixItHint::CreateInsertion(Tok.getLocation(), "= ");
return Actions.ActOnDesignatedInitializer(Desig, Tok.getLocation(),
true, ParseInitializer());
}
Diag(Tok, diag::err_expected_equal_designator);
return ExprError();
}
/// ParseInitializerWithPotentialDesignator - Parse the 'initializer' production
/// checking to see if the token stream starts with a designator.
///
/// designation:
/// designator-list '='
/// [GNU] array-designator
/// [GNU] identifier ':'
///
/// designator-list:
/// designator
/// designator-list designator
///
/// designator:
/// array-designator
/// '.' identifier
///
/// array-designator:
/// '[' constant-expression ']'
/// [GNU] '[' constant-expression '...' constant-expression ']'
///
/// NOTE: [OBC] allows '[ objc-receiver objc-message-args ]' as an
/// initializer (because it is an expression). We need to consider this case
/// when parsing array designators.
///
Parser::OwningExprResult Parser::ParseInitializerWithPotentialDesignator() {
// If this is the old-style GNU extension:
// designation ::= identifier ':'
// Handle it as a field designator. Otherwise, this must be the start of a
// normal expression.
if (Tok.is(tok::identifier)) {
const IdentifierInfo *FieldName = Tok.getIdentifierInfo();
std::string NewSyntax(".");
NewSyntax += FieldName->getName();
NewSyntax += " = ";
SourceLocation NameLoc = ConsumeToken(); // Eat the identifier.
assert(Tok.is(tok::colon) && "MayBeDesignationStart not working properly!");
SourceLocation ColonLoc = ConsumeToken();
Diag(Tok, diag::ext_gnu_old_style_field_designator)
<< CodeModificationHint::CreateReplacement(SourceRange(NameLoc,
ColonLoc),
NewSyntax);
Designation D;
D.AddDesignator(Designator::getField(FieldName, SourceLocation(), NameLoc));
return Actions.ActOnDesignatedInitializer(D, ColonLoc, true,
ParseInitializer());
}
// Desig - This is initialized when we see our first designator. We may have
// an objc message send with no designator, so we don't want to create this
// eagerly.
Designation Desig;
// Parse each designator in the designator list until we find an initializer.
while (Tok.is(tok::period) || Tok.is(tok::l_square)) {
if (Tok.is(tok::period)) {
// designator: '.' identifier
SourceLocation DotLoc = ConsumeToken();
if (Tok.isNot(tok::identifier)) {
Diag(Tok.getLocation(), diag::err_expected_field_designator);
return ExprError();
}
Desig.AddDesignator(Designator::getField(Tok.getIdentifierInfo(), DotLoc,
Tok.getLocation()));
ConsumeToken(); // Eat the identifier.
continue;
}
// We must have either an array designator now or an objc message send.
assert(Tok.is(tok::l_square) && "Unexpected token!");
// Handle the two forms of array designator:
// array-designator: '[' constant-expression ']'
// array-designator: '[' constant-expression '...' constant-expression ']'
//
// Also, we have to handle the case where the expression after the
// designator an an objc message send: '[' objc-message-expr ']'.
// Interesting cases are:
// [foo bar] -> objc message send
// [foo] -> array designator
// [foo ... bar] -> array designator
// [4][foo bar] -> obsolete GNU designation with objc message send.
//
SourceLocation StartLoc = ConsumeBracket();
// If Objective-C is enabled and this is a typename or other identifier
// receiver, parse this as a message send expression.
if (getLang().ObjC1 && isTokObjCMessageIdentifierReceiver()) {
// If we have exactly one array designator, this used the GNU
// 'designation: array-designator' extension, otherwise there should be no
// designators at all!
if (Desig.getNumDesignators() == 1 &&
(Desig.getDesignator(0).isArrayDesignator() ||
Desig.getDesignator(0).isArrayRangeDesignator()))
Diag(StartLoc, diag::ext_gnu_missing_equal_designator);
else if (Desig.getNumDesignators() > 0)
Diag(Tok, diag::err_expected_equal_designator);
IdentifierInfo *Name = Tok.getIdentifierInfo();
SourceLocation NameLoc = ConsumeToken();
return ParseAssignmentExprWithObjCMessageExprStart(
StartLoc, NameLoc, Name, ExprArg(Actions));
}
// Note that we parse this as an assignment expression, not a constant
// expression (allowing *=, =, etc) to handle the objc case. Sema needs
// to validate that the expression is a constant.
OwningExprResult Idx(ParseAssignmentExpression());
if (Idx.isInvalid()) {
SkipUntil(tok::r_square);
return move(Idx);
}
// Given an expression, we could either have a designator (if the next
// tokens are '...' or ']' or an objc message send. If this is an objc
// message send, handle it now. An objc-message send is the start of
// an assignment-expression production.
if (getLang().ObjC1 && Tok.isNot(tok::ellipsis) &&
Tok.isNot(tok::r_square)) {
// If we have exactly one array designator, this used the GNU
// 'designation: array-designator' extension, otherwise there should be no
// designators at all!
if (Desig.getNumDesignators() == 1 &&
(Desig.getDesignator(0).isArrayDesignator() ||
Desig.getDesignator(0).isArrayRangeDesignator()))
Diag(StartLoc, diag::ext_gnu_missing_equal_designator);
else if (Desig.getNumDesignators() > 0)
Diag(Tok, diag::err_expected_equal_designator);
return ParseAssignmentExprWithObjCMessageExprStart(StartLoc,
SourceLocation(),
0, move(Idx));
}
// If this is a normal array designator, remember it.
if (Tok.isNot(tok::ellipsis)) {
Desig.AddDesignator(Designator::getArray(Idx.release(), StartLoc));
} else {
// Handle the gnu array range extension.
Diag(Tok, diag::ext_gnu_array_range);
SourceLocation EllipsisLoc = ConsumeToken();
OwningExprResult RHS(ParseConstantExpression());
if (RHS.isInvalid()) {
SkipUntil(tok::r_square);
return move(RHS);
}
Desig.AddDesignator(Designator::getArrayRange(Idx.release(),
RHS.release(),
StartLoc, EllipsisLoc));
}
SourceLocation EndLoc = MatchRHSPunctuation(tok::r_square, StartLoc);
Desig.getDesignator(Desig.getNumDesignators() - 1).setRBracketLoc(EndLoc);
}
// Okay, we're done with the designator sequence. We know that there must be
// at least one designator, because the only case we can get into this method
// without a designator is when we have an objc message send. That case is
// handled and returned from above.
assert(!Desig.empty() && "Designator is empty?");
// Handle a normal designator sequence end, which is an equal.
if (Tok.is(tok::equal)) {
SourceLocation EqualLoc = ConsumeToken();
return Actions.ActOnDesignatedInitializer(Desig, EqualLoc, false,
ParseInitializer());
}
// We read some number of designators and found something that isn't an = or
// an initializer. If we have exactly one array designator, this
// is the GNU 'designation: array-designator' extension. Otherwise, it is a
// parse error.
if (Desig.getNumDesignators() == 1 &&
(Desig.getDesignator(0).isArrayDesignator() ||
Desig.getDesignator(0).isArrayRangeDesignator())) {
Diag(Tok, diag::ext_gnu_missing_equal_designator)
<< CodeModificationHint::CreateInsertion(Tok.getLocation(), "= ");
return Actions.ActOnDesignatedInitializer(Desig, Tok.getLocation(),
true, ParseInitializer());
}
Diag(Tok, diag::err_expected_equal_designator);
return ExprError();
}