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//===--- ParseDecl.cpp - Declaration Parsing --------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Declaration portions of the Parser interfaces.
//
//===----------------------------------------------------------------------===//
#include "clang/Parse/Parser.h"
#include "RAIIObjectsForParser.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/Basic/AddressSpaces.h"
#include "clang/Basic/Attributes.h"
#include "clang/Basic/CharInfo.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Parse/ParseDiagnostic.h"
#include "clang/Sema/Lookup.h"
#include "clang/Sema/ParsedTemplate.h"
#include "clang/Sema/PrettyDeclStackTrace.h"
#include "clang/Sema/Scope.h"
#include "clang/Sema/SemaDiagnostic.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/ScopedPrinter.h"
using namespace clang;
//===----------------------------------------------------------------------===//
// C99 6.7: Declarations.
//===----------------------------------------------------------------------===//
/// ParseTypeName
/// type-name: [C99 6.7.6]
/// specifier-qualifier-list abstract-declarator[opt]
///
/// Called type-id in C++.
TypeResult Parser::ParseTypeName(SourceRange *Range,
Declarator::TheContext Context,
AccessSpecifier AS,
Decl **OwnedType,
ParsedAttributes *Attrs) {
DeclSpecContext DSC = getDeclSpecContextFromDeclaratorContext(Context);
if (DSC == DSC_normal)
DSC = DSC_type_specifier;
// Parse the common declaration-specifiers piece.
DeclSpec DS(AttrFactory);
if (Attrs)
DS.addAttributes(Attrs->getList());
ParseSpecifierQualifierList(DS, AS, DSC);
if (OwnedType)
*OwnedType = DS.isTypeSpecOwned() ? DS.getRepAsDecl() : nullptr;
// Parse the abstract-declarator, if present.
Declarator DeclaratorInfo(DS, Context);
ParseDeclarator(DeclaratorInfo);
if (Range)
*Range = DeclaratorInfo.getSourceRange();
if (DeclaratorInfo.isInvalidType())
return true;
return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
}
/// isAttributeLateParsed - Return true if the attribute has arguments that
/// require late parsing.
static bool isAttributeLateParsed(const IdentifierInfo &II) {
#define CLANG_ATTR_LATE_PARSED_LIST
return llvm::StringSwitch<bool>(II.getName())
#include "clang/Parse/AttrParserStringSwitches.inc"
.Default(false);
#undef CLANG_ATTR_LATE_PARSED_LIST
}
/// ParseGNUAttributes - Parse a non-empty attributes list.
///
/// [GNU] attributes:
/// attribute
/// attributes attribute
///
/// [GNU] attribute:
/// '__attribute__' '(' '(' attribute-list ')' ')'
///
/// [GNU] attribute-list:
/// attrib
/// attribute_list ',' attrib
///
/// [GNU] attrib:
/// empty
/// attrib-name
/// attrib-name '(' identifier ')'
/// attrib-name '(' identifier ',' nonempty-expr-list ')'
/// attrib-name '(' argument-expression-list [C99 6.5.2] ')'
///
/// [GNU] attrib-name:
/// identifier
/// typespec
/// typequal
/// storageclass
///
/// Whether an attribute takes an 'identifier' is determined by the
/// attrib-name. GCC's behavior here is not worth imitating:
///
/// * In C mode, if the attribute argument list starts with an identifier
/// followed by a ',' or an ')', and the identifier doesn't resolve to
/// a type, it is parsed as an identifier. If the attribute actually
/// wanted an expression, it's out of luck (but it turns out that no
/// attributes work that way, because C constant expressions are very
/// limited).
/// * In C++ mode, if the attribute argument list starts with an identifier,
/// and the attribute *wants* an identifier, it is parsed as an identifier.
/// At block scope, any additional tokens between the identifier and the
/// ',' or ')' are ignored, otherwise they produce a parse error.
///
/// We follow the C++ model, but don't allow junk after the identifier.
void Parser::ParseGNUAttributes(ParsedAttributes &attrs,
SourceLocation *endLoc,
LateParsedAttrList *LateAttrs,
Declarator *D) {
assert(Tok.is(tok::kw___attribute) && "Not a GNU attribute list!");
while (Tok.is(tok::kw___attribute)) {
ConsumeToken();
if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after,
"attribute")) {
SkipUntil(tok::r_paren, StopAtSemi); // skip until ) or ;
return;
}
if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, "(")) {
SkipUntil(tok::r_paren, StopAtSemi); // skip until ) or ;
return;
}
// Parse the attribute-list. e.g. __attribute__(( weak, alias("__f") ))
while (true) {
// Allow empty/non-empty attributes. ((__vector_size__(16),,,,))
if (TryConsumeToken(tok::comma))
continue;
// Expect an identifier or declaration specifier (const, int, etc.)
if (Tok.isAnnotation())
break;
IdentifierInfo *AttrName = Tok.getIdentifierInfo();
if (!AttrName)
break;
SourceLocation AttrNameLoc = ConsumeToken();
if (Tok.isNot(tok::l_paren)) {
attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
AttributeList::AS_GNU);
continue;
}
// Handle "parameterized" attributes
if (!LateAttrs || !isAttributeLateParsed(*AttrName)) {
ParseGNUAttributeArgs(AttrName, AttrNameLoc, attrs, endLoc, nullptr,
SourceLocation(), AttributeList::AS_GNU, D);
continue;
}
// Handle attributes with arguments that require late parsing.
LateParsedAttribute *LA =
new LateParsedAttribute(this, *AttrName, AttrNameLoc);
LateAttrs->push_back(LA);
// Attributes in a class are parsed at the end of the class, along
// with other late-parsed declarations.
if (!ClassStack.empty() && !LateAttrs->parseSoon())
getCurrentClass().LateParsedDeclarations.push_back(LA);
// Be sure ConsumeAndStoreUntil doesn't see the start l_paren, since it
// recursively consumes balanced parens.
LA->Toks.push_back(Tok);
ConsumeParen();
// Consume everything up to and including the matching right parens.
ConsumeAndStoreUntil(tok::r_paren, LA->Toks, /*StopAtSemi=*/true);
Token Eof;
Eof.startToken();
Eof.setLocation(Tok.getLocation());
LA->Toks.push_back(Eof);
}
if (ExpectAndConsume(tok::r_paren))
SkipUntil(tok::r_paren, StopAtSemi);
SourceLocation Loc = Tok.getLocation();
if (ExpectAndConsume(tok::r_paren))
SkipUntil(tok::r_paren, StopAtSemi);
if (endLoc)
*endLoc = Loc;
}
}
/// \brief Normalizes an attribute name by dropping prefixed and suffixed __.
static StringRef normalizeAttrName(StringRef Name) {
if (Name.size() >= 4 && Name.startswith("__") && Name.endswith("__"))
Name = Name.drop_front(2).drop_back(2);
return Name;
}
/// \brief Determine whether the given attribute has an identifier argument.
static bool attributeHasIdentifierArg(const IdentifierInfo &II) {
#define CLANG_ATTR_IDENTIFIER_ARG_LIST
return llvm::StringSwitch<bool>(normalizeAttrName(II.getName()))
#include "clang/Parse/AttrParserStringSwitches.inc"
.Default(false);
#undef CLANG_ATTR_IDENTIFIER_ARG_LIST
}
/// \brief Determine whether the given attribute parses a type argument.
static bool attributeIsTypeArgAttr(const IdentifierInfo &II) {
#define CLANG_ATTR_TYPE_ARG_LIST
return llvm::StringSwitch<bool>(normalizeAttrName(II.getName()))
#include "clang/Parse/AttrParserStringSwitches.inc"
.Default(false);
#undef CLANG_ATTR_TYPE_ARG_LIST
}
/// \brief Determine whether the given attribute requires parsing its arguments
/// in an unevaluated context or not.
static bool attributeParsedArgsUnevaluated(const IdentifierInfo &II) {
#define CLANG_ATTR_ARG_CONTEXT_LIST
return llvm::StringSwitch<bool>(normalizeAttrName(II.getName()))
#include "clang/Parse/AttrParserStringSwitches.inc"
.Default(false);
#undef CLANG_ATTR_ARG_CONTEXT_LIST
}
IdentifierLoc *Parser::ParseIdentifierLoc() {
assert(Tok.is(tok::identifier) && "expected an identifier");
IdentifierLoc *IL = IdentifierLoc::create(Actions.Context,
Tok.getLocation(),
Tok.getIdentifierInfo());
ConsumeToken();
return IL;
}
void Parser::ParseSwiftNewtypeAttribute(
IdentifierInfo &SwiftNewtype, SourceLocation SwiftNewtypeLoc,
ParsedAttributes &attrs, SourceLocation *endLoc, IdentifierInfo *ScopeName,
SourceLocation ScopeLoc, AttributeList::Syntax Syntax) {
BalancedDelimiterTracker Parens(*this, tok::l_paren);
Parens.consumeOpen();
if (Tok.is(tok::r_paren)) {
Diag(Tok.getLocation(), diag::err_argument_required_after_attribute);
Parens.consumeClose();
return;
}
if (Tok.isNot(tok::kw_struct) && Tok.isNot(tok::kw_enum)) {
Diag(Tok.getLocation(), diag::warn_attribute_type_not_supported)
<< &SwiftNewtype << Tok.getIdentifierInfo();
if (!isTokenSpecial())
ConsumeToken();
Parens.consumeClose();
return;
}
auto IL = IdentifierLoc::create(Actions.Context, Tok.getLocation(),
Tok.getIdentifierInfo());
ConsumeToken();
auto identLoc = ArgsUnion(IL);
attrs.addNew(&SwiftNewtype,
SourceRange(SwiftNewtypeLoc, Parens.getCloseLocation()),
ScopeName, ScopeLoc, &identLoc, 1, Syntax);
Parens.consumeClose();
}
void Parser::ParseAttributeWithTypeArg(IdentifierInfo &AttrName,
SourceLocation AttrNameLoc,
ParsedAttributes &Attrs,
SourceLocation *EndLoc,
IdentifierInfo *ScopeName,
SourceLocation ScopeLoc,
AttributeList::Syntax Syntax) {
BalancedDelimiterTracker Parens(*this, tok::l_paren);
Parens.consumeOpen();
TypeResult T;
if (Tok.isNot(tok::r_paren))
T = ParseTypeName();
if (Parens.consumeClose())
return;
if (T.isInvalid())
return;
if (T.isUsable())
Attrs.addNewTypeAttr(&AttrName,
SourceRange(AttrNameLoc, Parens.getCloseLocation()),
ScopeName, ScopeLoc, T.get(), Syntax);
else
Attrs.addNew(&AttrName, SourceRange(AttrNameLoc, Parens.getCloseLocation()),
ScopeName, ScopeLoc, nullptr, 0, Syntax);
}
unsigned Parser::ParseAttributeArgsCommon(
IdentifierInfo *AttrName, SourceLocation AttrNameLoc,
ParsedAttributes &Attrs, SourceLocation *EndLoc, IdentifierInfo *ScopeName,
SourceLocation ScopeLoc, AttributeList::Syntax Syntax) {
// Ignore the left paren location for now.
ConsumeParen();
ArgsVector ArgExprs;
if (Tok.is(tok::identifier)) {
// If this attribute wants an 'identifier' argument, make it so.
bool IsIdentifierArg = attributeHasIdentifierArg(*AttrName);
AttributeList::Kind AttrKind =
AttributeList::getKind(AttrName, ScopeName, Syntax);
// If we don't know how to parse this attribute, but this is the only
// token in this argument, assume it's meant to be an identifier.
if (AttrKind == AttributeList::UnknownAttribute ||
AttrKind == AttributeList::IgnoredAttribute) {
const Token &Next = NextToken();
IsIdentifierArg = Next.isOneOf(tok::r_paren, tok::comma);
}
if (IsIdentifierArg)
ArgExprs.push_back(ParseIdentifierLoc());
}
if (!ArgExprs.empty() ? Tok.is(tok::comma) : Tok.isNot(tok::r_paren)) {
// Eat the comma.
if (!ArgExprs.empty())
ConsumeToken();
// Parse the non-empty comma-separated list of expressions.
do {
bool Uneval = attributeParsedArgsUnevaluated(*AttrName);
EnterExpressionEvaluationContext Unevaluated(
Actions, Uneval ? Sema::Unevaluated : Sema::ConstantEvaluated,
/*LambdaContextDecl=*/nullptr,
/*IsDecltype=*/false);
ExprResult ArgExpr(
Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression()));
if (ArgExpr.isInvalid()) {
SkipUntil(tok::r_paren, StopAtSemi);
return 0;
}
ArgExprs.push_back(ArgExpr.get());
// Eat the comma, move to the next argument
} while (TryConsumeToken(tok::comma));
}
SourceLocation RParen = Tok.getLocation();
if (!ExpectAndConsume(tok::r_paren)) {
SourceLocation AttrLoc = ScopeLoc.isValid() ? ScopeLoc : AttrNameLoc;
Attrs.addNew(AttrName, SourceRange(AttrLoc, RParen), ScopeName, ScopeLoc,
ArgExprs.data(), ArgExprs.size(), Syntax);
}
if (EndLoc)
*EndLoc = RParen;
return static_cast<unsigned>(ArgExprs.size());
}
/// Parse the arguments to a parameterized GNU attribute or
/// a C++11 attribute in "gnu" namespace.
void Parser::ParseGNUAttributeArgs(IdentifierInfo *AttrName,
SourceLocation AttrNameLoc,
ParsedAttributes &Attrs,
SourceLocation *EndLoc,
IdentifierInfo *ScopeName,
SourceLocation ScopeLoc,
AttributeList::Syntax Syntax,
Declarator *D) {
assert(Tok.is(tok::l_paren) && "Attribute arg list not starting with '('");
AttributeList::Kind AttrKind =
AttributeList::getKind(AttrName, ScopeName, Syntax);
if (AttrKind == AttributeList::AT_Availability) {
ParseAvailabilityAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
ScopeLoc, Syntax);
return;
} else if (AttrKind == AttributeList::AT_ObjCBridgeRelated) {
ParseObjCBridgeRelatedAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc,
ScopeName, ScopeLoc, Syntax);
return;
} else if (AttrKind == AttributeList::AT_TypeTagForDatatype) {
ParseTypeTagForDatatypeAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc,
ScopeName, ScopeLoc, Syntax);
return;
} else if (AttrKind == AttributeList::AT_SwiftNewtype) {
ParseSwiftNewtypeAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc,
ScopeName, ScopeLoc, Syntax);
return;
} else if (attributeIsTypeArgAttr(*AttrName)) {
ParseAttributeWithTypeArg(*AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
ScopeLoc, Syntax);
return;
}
// These may refer to the function arguments, but need to be parsed early to
// participate in determining whether it's a redeclaration.
llvm::Optional<ParseScope> PrototypeScope;
if (normalizeAttrName(AttrName->getName()) == "enable_if" &&
D && D->isFunctionDeclarator()) {
DeclaratorChunk::FunctionTypeInfo FTI = D->getFunctionTypeInfo();
PrototypeScope.emplace(this, Scope::FunctionPrototypeScope |
Scope::FunctionDeclarationScope |
Scope::DeclScope);
for (unsigned i = 0; i != FTI.NumParams; ++i) {
ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param);
Actions.ActOnReenterCXXMethodParameter(getCurScope(), Param);
}
}
ParseAttributeArgsCommon(AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
ScopeLoc, Syntax);
}
bool Parser::ParseMicrosoftDeclSpecArgs(IdentifierInfo *AttrName,
SourceLocation AttrNameLoc,
ParsedAttributes &Attrs) {
// If the attribute isn't known, we will not attempt to parse any
// arguments.
if (!hasAttribute(AttrSyntax::Declspec, nullptr, AttrName,
getTargetInfo(), getLangOpts())) {
// Eat the left paren, then skip to the ending right paren.
ConsumeParen();
SkipUntil(tok::r_paren);
return false;
}
SourceLocation OpenParenLoc = Tok.getLocation();
if (AttrName->getName() == "property") {
// The property declspec is more complex in that it can take one or two
// assignment expressions as a parameter, but the lhs of the assignment
// must be named get or put.
BalancedDelimiterTracker T(*this, tok::l_paren);
T.expectAndConsume(diag::err_expected_lparen_after,
AttrName->getNameStart(), tok::r_paren);
enum AccessorKind {
AK_Invalid = -1,
AK_Put = 0,
AK_Get = 1 // indices into AccessorNames
};
IdentifierInfo *AccessorNames[] = {nullptr, nullptr};
bool HasInvalidAccessor = false;
// Parse the accessor specifications.
while (true) {
// Stop if this doesn't look like an accessor spec.
if (!Tok.is(tok::identifier)) {
// If the user wrote a completely empty list, use a special diagnostic.
if (Tok.is(tok::r_paren) && !HasInvalidAccessor &&
AccessorNames[AK_Put] == nullptr &&
AccessorNames[AK_Get] == nullptr) {
Diag(AttrNameLoc, diag::err_ms_property_no_getter_or_putter);
break;
}
Diag(Tok.getLocation(), diag::err_ms_property_unknown_accessor);
break;
}
AccessorKind Kind;
SourceLocation KindLoc = Tok.getLocation();
StringRef KindStr = Tok.getIdentifierInfo()->getName();
if (KindStr == "get") {
Kind = AK_Get;
} else if (KindStr == "put") {
Kind = AK_Put;
// Recover from the common mistake of using 'set' instead of 'put'.
} else if (KindStr == "set") {
Diag(KindLoc, diag::err_ms_property_has_set_accessor)
<< FixItHint::CreateReplacement(KindLoc, "put");
Kind = AK_Put;
// Handle the mistake of forgetting the accessor kind by skipping
// this accessor.
} else if (NextToken().is(tok::comma) || NextToken().is(tok::r_paren)) {
Diag(KindLoc, diag::err_ms_property_missing_accessor_kind);
ConsumeToken();
HasInvalidAccessor = true;
goto next_property_accessor;
// Otherwise, complain about the unknown accessor kind.
} else {
Diag(KindLoc, diag::err_ms_property_unknown_accessor);
HasInvalidAccessor = true;
Kind = AK_Invalid;
// Try to keep parsing unless it doesn't look like an accessor spec.
if (!NextToken().is(tok::equal))
break;
}
// Consume the identifier.
ConsumeToken();
// Consume the '='.
if (!TryConsumeToken(tok::equal)) {
Diag(Tok.getLocation(), diag::err_ms_property_expected_equal)
<< KindStr;
break;
}
// Expect the method name.
if (!Tok.is(tok::identifier)) {
Diag(Tok.getLocation(), diag::err_ms_property_expected_accessor_name);
break;
}
if (Kind == AK_Invalid) {
// Just drop invalid accessors.
} else if (AccessorNames[Kind] != nullptr) {
// Complain about the repeated accessor, ignore it, and keep parsing.
Diag(KindLoc, diag::err_ms_property_duplicate_accessor) << KindStr;
} else {
AccessorNames[Kind] = Tok.getIdentifierInfo();
}
ConsumeToken();
next_property_accessor:
// Keep processing accessors until we run out.
if (TryConsumeToken(tok::comma))
continue;
// If we run into the ')', stop without consuming it.
if (Tok.is(tok::r_paren))
break;
Diag(Tok.getLocation(), diag::err_ms_property_expected_comma_or_rparen);
break;
}
// Only add the property attribute if it was well-formed.
if (!HasInvalidAccessor)
Attrs.addNewPropertyAttr(AttrName, AttrNameLoc, nullptr, SourceLocation(),
AccessorNames[AK_Get], AccessorNames[AK_Put],
AttributeList::AS_Declspec);
T.skipToEnd();
return !HasInvalidAccessor;
}
unsigned NumArgs =
ParseAttributeArgsCommon(AttrName, AttrNameLoc, Attrs, nullptr, nullptr,
SourceLocation(), AttributeList::AS_Declspec);
// If this attribute's args were parsed, and it was expected to have
// arguments but none were provided, emit a diagnostic.
const AttributeList *Attr = Attrs.getList();
if (Attr && Attr->getMaxArgs() && !NumArgs) {
Diag(OpenParenLoc, diag::err_attribute_requires_arguments) << AttrName;
return false;
}
return true;
}
/// [MS] decl-specifier:
/// __declspec ( extended-decl-modifier-seq )
///
/// [MS] extended-decl-modifier-seq:
/// extended-decl-modifier[opt]
/// extended-decl-modifier extended-decl-modifier-seq
void Parser::ParseMicrosoftDeclSpecs(ParsedAttributes &Attrs,
SourceLocation *End) {
assert(getLangOpts().DeclSpecKeyword && "__declspec keyword is not enabled");
assert(Tok.is(tok::kw___declspec) && "Not a declspec!");
while (Tok.is(tok::kw___declspec)) {
ConsumeToken();
BalancedDelimiterTracker T(*this, tok::l_paren);
if (T.expectAndConsume(diag::err_expected_lparen_after, "__declspec",
tok::r_paren))
return;
// An empty declspec is perfectly legal and should not warn. Additionally,
// you can specify multiple attributes per declspec.
while (Tok.isNot(tok::r_paren)) {
// Attribute not present.
if (TryConsumeToken(tok::comma))
continue;
// We expect either a well-known identifier or a generic string. Anything
// else is a malformed declspec.
bool IsString = Tok.getKind() == tok::string_literal;
if (!IsString && Tok.getKind() != tok::identifier &&
Tok.getKind() != tok::kw_restrict) {
Diag(Tok, diag::err_ms_declspec_type);
T.skipToEnd();
return;
}
IdentifierInfo *AttrName;
SourceLocation AttrNameLoc;
if (IsString) {
SmallString<8> StrBuffer;
bool Invalid = false;
StringRef Str = PP.getSpelling(Tok, StrBuffer, &Invalid);
if (Invalid) {
T.skipToEnd();
return;
}
AttrName = PP.getIdentifierInfo(Str);
AttrNameLoc = ConsumeStringToken();
} else {
AttrName = Tok.getIdentifierInfo();
AttrNameLoc = ConsumeToken();
}
bool AttrHandled = false;
// Parse attribute arguments.
if (Tok.is(tok::l_paren))
AttrHandled = ParseMicrosoftDeclSpecArgs(AttrName, AttrNameLoc, Attrs);
else if (AttrName->getName() == "property")
// The property attribute must have an argument list.
Diag(Tok.getLocation(), diag::err_expected_lparen_after)
<< AttrName->getName();
if (!AttrHandled)
Attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
AttributeList::AS_Declspec);
}
T.consumeClose();
if (End)
*End = T.getCloseLocation();
}
}
void Parser::ParseMicrosoftTypeAttributes(ParsedAttributes &attrs) {
// Treat these like attributes
while (true) {
switch (Tok.getKind()) {
case tok::kw___fastcall:
case tok::kw___stdcall:
case tok::kw___thiscall:
case tok::kw___regcall:
case tok::kw___cdecl:
case tok::kw___vectorcall:
case tok::kw___ptr64:
case tok::kw___w64:
case tok::kw___ptr32:
case tok::kw___sptr:
case tok::kw___uptr: {
IdentifierInfo *AttrName = Tok.getIdentifierInfo();
SourceLocation AttrNameLoc = ConsumeToken();
attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
AttributeList::AS_Keyword);
break;
}
default:
return;
}
}
}
void Parser::DiagnoseAndSkipExtendedMicrosoftTypeAttributes() {
SourceLocation StartLoc = Tok.getLocation();
SourceLocation EndLoc = SkipExtendedMicrosoftTypeAttributes();
if (EndLoc.isValid()) {
SourceRange Range(StartLoc, EndLoc);
Diag(StartLoc, diag::warn_microsoft_qualifiers_ignored) << Range;
}
}
SourceLocation Parser::SkipExtendedMicrosoftTypeAttributes() {
SourceLocation EndLoc;
while (true) {
switch (Tok.getKind()) {
case tok::kw_const:
case tok::kw_volatile:
case tok::kw___fastcall:
case tok::kw___stdcall:
case tok::kw___thiscall:
case tok::kw___cdecl:
case tok::kw___vectorcall:
case tok::kw___ptr32:
case tok::kw___ptr64:
case tok::kw___w64:
case tok::kw___unaligned:
case tok::kw___sptr:
case tok::kw___uptr:
EndLoc = ConsumeToken();
break;
default:
return EndLoc;
}
}
}
void Parser::ParseBorlandTypeAttributes(ParsedAttributes &attrs) {
// Treat these like attributes
while (Tok.is(tok::kw___pascal)) {
IdentifierInfo *AttrName = Tok.getIdentifierInfo();
SourceLocation AttrNameLoc = ConsumeToken();
attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
AttributeList::AS_Keyword);
}
}
void Parser::ParseOpenCLKernelAttributes(ParsedAttributes &attrs) {
// Treat these like attributes
while (Tok.is(tok::kw___kernel)) {
IdentifierInfo *AttrName = Tok.getIdentifierInfo();
SourceLocation AttrNameLoc = ConsumeToken();
attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
AttributeList::AS_Keyword);
}
}
void Parser::ParseOpenCLQualifiers(ParsedAttributes &Attrs) {
IdentifierInfo *AttrName = Tok.getIdentifierInfo();
SourceLocation AttrNameLoc = Tok.getLocation();
Attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
AttributeList::AS_Keyword);
}
void Parser::ParseNullabilityTypeSpecifiers(ParsedAttributes &attrs) {
// Treat these like attributes, even though they're type specifiers.
while (true) {
switch (Tok.getKind()) {
case tok::kw__Nonnull:
case tok::kw__Nullable:
case tok::kw__Null_unspecified: {
IdentifierInfo *AttrName = Tok.getIdentifierInfo();
SourceLocation AttrNameLoc = ConsumeToken();
if (!getLangOpts().ObjC1)
Diag(AttrNameLoc, diag::ext_nullability)
<< AttrName;
attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
AttributeList::AS_Keyword);
break;
}
default:
return;
}
}
}
static bool VersionNumberSeparator(const char Separator) {
return (Separator == '.' || Separator == '_');
}
/// \brief Parse a version number.
///
/// version:
/// simple-integer
/// simple-integer ',' simple-integer
/// simple-integer ',' simple-integer ',' simple-integer
VersionTuple Parser::ParseVersionTuple(SourceRange &Range) {
Range = SourceRange(Tok.getLocation(), Tok.getEndLoc());
if (!Tok.is(tok::numeric_constant)) {
Diag(Tok, diag::err_expected_version);
SkipUntil(tok::comma, tok::r_paren,
StopAtSemi | StopBeforeMatch | StopAtCodeCompletion);
return VersionTuple();
}
// Parse the major (and possibly minor and subminor) versions, which
// are stored in the numeric constant. We utilize a quirk of the
// lexer, which is that it handles something like 1.2.3 as a single
// numeric constant, rather than two separate tokens.
SmallString<512> Buffer;
Buffer.resize(Tok.getLength()+1);
const char *ThisTokBegin = &Buffer[0];
// Get the spelling of the token, which eliminates trigraphs, etc.
bool Invalid = false;
unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin, &Invalid);
if (Invalid)
return VersionTuple();
// Parse the major version.
unsigned AfterMajor = 0;
unsigned Major = 0;
while (AfterMajor < ActualLength && isDigit(ThisTokBegin[AfterMajor])) {
Major = Major * 10 + ThisTokBegin[AfterMajor] - '0';
++AfterMajor;
}
if (AfterMajor == 0) {
Diag(Tok, diag::err_expected_version);
SkipUntil(tok::comma, tok::r_paren,
StopAtSemi | StopBeforeMatch | StopAtCodeCompletion);
return VersionTuple();
}
if (AfterMajor == ActualLength) {
ConsumeToken();
// We only had a single version component.
if (Major == 0) {
Diag(Tok, diag::err_zero_version);
return VersionTuple();
}
return VersionTuple(Major);
}
const char AfterMajorSeparator = ThisTokBegin[AfterMajor];
if (!VersionNumberSeparator(AfterMajorSeparator)
|| (AfterMajor + 1 == ActualLength)) {
Diag(Tok, diag::err_expected_version);
SkipUntil(tok::comma, tok::r_paren,
StopAtSemi | StopBeforeMatch | StopAtCodeCompletion);
return VersionTuple();
}
// Parse the minor version.
unsigned AfterMinor = AfterMajor + 1;
unsigned Minor = 0;
while (AfterMinor < ActualLength && isDigit(ThisTokBegin[AfterMinor])) {
Minor = Minor * 10 + ThisTokBegin[AfterMinor] - '0';
++AfterMinor;
}
if (AfterMinor == ActualLength) {
ConsumeToken();
// We had major.minor.
if (Major == 0 && Minor == 0) {
Diag(Tok, diag::err_zero_version);
return VersionTuple();
}
return VersionTuple(Major, Minor, (AfterMajorSeparator == '_'));
}
const char AfterMinorSeparator = ThisTokBegin[AfterMinor];
// If what follows is not a '.' or '_', we have a problem.
if (!VersionNumberSeparator(AfterMinorSeparator)) {
Diag(Tok, diag::err_expected_version);
SkipUntil(tok::comma, tok::r_paren,
StopAtSemi | StopBeforeMatch | StopAtCodeCompletion);
return VersionTuple();
}
// Warn if separators, be it '.' or '_', do not match.
if (AfterMajorSeparator != AfterMinorSeparator)
Diag(Tok, diag::warn_expected_consistent_version_separator);
// Parse the subminor version.
unsigned AfterSubminor = AfterMinor + 1;
unsigned Subminor = 0;
while (AfterSubminor < ActualLength && isDigit(ThisTokBegin[AfterSubminor])) {
Subminor = Subminor * 10 + ThisTokBegin[AfterSubminor] - '0';
++AfterSubminor;
}
if (AfterSubminor != ActualLength) {
Diag(Tok, diag::err_expected_version);
SkipUntil(tok::comma, tok::r_paren,
StopAtSemi | StopBeforeMatch | StopAtCodeCompletion);
return VersionTuple();
}
ConsumeToken();
return VersionTuple(Major, Minor, Subminor, (AfterMajorSeparator == '_'));
}
/// \brief Parse the contents of the "availability" attribute.
///
/// availability-attribute:
/// 'availability' '(' platform ',' opt-strict version-arg-list,
/// opt-replacement, opt-message')'
///
/// platform:
/// identifier
///
/// opt-strict:
/// 'strict' ','
///
/// version-arg-list:
/// version-arg
/// version-arg ',' version-arg-list
///
/// version-arg:
/// 'introduced' '=' version
/// 'deprecated' ['=' version]
/// 'obsoleted' = version
/// 'unavailable'
/// opt-replacement:
/// 'replacement' '=' <string>
/// opt-message:
/// 'message' '=' <string>
void Parser::ParseAvailabilityAttribute(IdentifierInfo &Availability,
SourceLocation AvailabilityLoc,
ParsedAttributes &attrs,
SourceLocation *endLoc,
IdentifierInfo *ScopeName,
SourceLocation ScopeLoc,
AttributeList::Syntax Syntax) {
enum { Introduced, Deprecated, Obsoleted, Unknown };
AvailabilityChange Changes[Unknown];
ExprResult MessageExpr, ReplacementExpr;
// Opening '('.
BalancedDelimiterTracker T(*this, tok::l_paren);
if (T.consumeOpen()) {
Diag(Tok, diag::err_expected) << tok::l_paren;
return;
}
// Parse the platform name.
if (Tok.isNot(tok::identifier)) {
Diag(Tok, diag::err_availability_expected_platform);
SkipUntil(tok::r_paren, StopAtSemi);
return;
}
IdentifierLoc *Platform = ParseIdentifierLoc();
// Canonicalize platform name from "macosx" to "macos".
if (Platform->Ident && Platform->Ident->getName() == "macosx")
Platform->Ident = PP.getIdentifierInfo("macos");
// Canonicalize platform name from "macosx_app_extension" to
// "macos_app_extension".
if (Platform->Ident && Platform->Ident->getName() == "macosx_app_extension")
Platform->Ident = PP.getIdentifierInfo("macos_app_extension");
// Parse the ',' following the platform name.
if (ExpectAndConsume(tok::comma)) {
SkipUntil(tok::r_paren, StopAtSemi);
return;
}
// If we haven't grabbed the pointers for the identifiers
// "introduced", "deprecated", and "obsoleted", do so now.
if (!Ident_introduced) {
Ident_introduced = PP.getIdentifierInfo("introduced");
Ident_deprecated = PP.getIdentifierInfo("deprecated");
Ident_obsoleted = PP.getIdentifierInfo("obsoleted");
Ident_unavailable = PP.getIdentifierInfo("unavailable");
Ident_message = PP.getIdentifierInfo("message");
Ident_strict = PP.getIdentifierInfo("strict");
Ident_replacement = PP.getIdentifierInfo("replacement");
}
// Parse the optional "strict", the optional "replacement" and the set of
// introductions/deprecations/removals.
SourceLocation UnavailableLoc, StrictLoc;
do {
if (Tok.isNot(tok::identifier)) {
Diag(Tok, diag::err_availability_expected_change);
SkipUntil(tok::r_paren, StopAtSemi);
return;
}
IdentifierInfo *Keyword = Tok.getIdentifierInfo();
SourceLocation KeywordLoc = ConsumeToken();
if (Keyword == Ident_strict) {
if (StrictLoc.isValid()) {
Diag(KeywordLoc, diag::err_availability_redundant)
<< Keyword << SourceRange(StrictLoc);
}
StrictLoc = KeywordLoc;
continue;
}
if (Keyword == Ident_unavailable) {
if (UnavailableLoc.isValid()) {
Diag(KeywordLoc, diag::err_availability_redundant)
<< Keyword << SourceRange(UnavailableLoc);
}
UnavailableLoc = KeywordLoc;
continue;
}
if (Keyword == Ident_deprecated && Platform->Ident &&
Platform->Ident->getName() == "swift") {
// For swift, we deprecate for all versions.
if (!Changes[Deprecated].KeywordLoc.isInvalid()) {
Diag(KeywordLoc, diag::err_availability_redundant)
<< Keyword
<< SourceRange(Changes[Deprecated].KeywordLoc);
}
Changes[Deprecated].KeywordLoc = KeywordLoc;
// Use a fake version here.
Changes[Deprecated].Version = VersionTuple(1);
continue;
}
if (Tok.isNot(tok::equal)) {
Diag(Tok, diag::err_expected_after) << Keyword << tok::equal;
SkipUntil(tok::r_paren, StopAtSemi);
return;
}
ConsumeToken();
if (Keyword == Ident_message || Keyword == Ident_replacement) {
if (Tok.isNot(tok::string_literal)) {
Diag(Tok, diag::err_expected_string_literal)
<< /*Source='availability attribute'*/2;
SkipUntil(tok::r_paren, StopAtSemi);
return;
}
if (Keyword == Ident_message)
MessageExpr = ParseStringLiteralExpression();
else
ReplacementExpr = ParseStringLiteralExpression();
// Also reject wide string literals.
if (StringLiteral *MessageStringLiteral =
cast_or_null<StringLiteral>(MessageExpr.get())) {
if (MessageStringLiteral->getCharByteWidth() != 1) {
Diag(MessageStringLiteral->getSourceRange().getBegin(),
diag::err_expected_string_literal)
<< /*Source='availability attribute'*/ 2;
SkipUntil(tok::r_paren, StopAtSemi);
return;
}
}
if (Keyword == Ident_message)
break;
else
continue;
}
// Special handling of 'NA' only when applied to introduced or
// deprecated.
if ((Keyword == Ident_introduced || Keyword == Ident_deprecated) &&
Tok.is(tok::identifier)) {
IdentifierInfo *NA = Tok.getIdentifierInfo();
if (NA->getName() == "NA") {
ConsumeToken();
if (Keyword == Ident_introduced)
UnavailableLoc = KeywordLoc;
continue;
}
}
SourceRange VersionRange;
VersionTuple Version = ParseVersionTuple(VersionRange);
if (Version.empty()) {
SkipUntil(tok::r_paren, StopAtSemi);
return;
}
unsigned Index;
if (Keyword == Ident_introduced)
Index = Introduced;
else if (Keyword == Ident_deprecated)
Index = Deprecated;
else if (Keyword == Ident_obsoleted)
Index = Obsoleted;
else
Index = Unknown;
if (Index < Unknown) {
if (!Changes[Index].KeywordLoc.isInvalid()) {
Diag(KeywordLoc, diag::err_availability_redundant)
<< Keyword
<< SourceRange(Changes[Index].KeywordLoc,
Changes[Index].VersionRange.getEnd());
}
Changes[Index].KeywordLoc = KeywordLoc;
Changes[Index].Version = Version;
Changes[Index].VersionRange = VersionRange;
} else {
Diag(KeywordLoc, diag::err_availability_unknown_change)
<< Keyword << VersionRange;
}
} while (TryConsumeToken(tok::comma));
// Closing ')'.
if (T.consumeClose())
return;
if (endLoc)
*endLoc = T.getCloseLocation();
// The 'unavailable' availability cannot be combined with any other
// availability changes. Make sure that hasn't happened.
if (UnavailableLoc.isValid()) {
bool Complained = false;
for (unsigned Index = Introduced; Index != Unknown; ++Index) {
if (Changes[Index].KeywordLoc.isValid()) {
if (!Complained) {
Diag(UnavailableLoc, diag::warn_availability_and_unavailable)
<< SourceRange(Changes[Index].KeywordLoc,
Changes[Index].VersionRange.getEnd());
Complained = true;
}
// Clear out the availability.
Changes[Index] = AvailabilityChange();
}
}
}
// Record this attribute
attrs.addNew(&Availability,
SourceRange(AvailabilityLoc, T.getCloseLocation()),
ScopeName, ScopeLoc,
Platform,
Changes[Introduced],
Changes[Deprecated],
Changes[Obsoleted],
UnavailableLoc, MessageExpr.get(),
Syntax, StrictLoc, ReplacementExpr.get());
}
/// \brief Parse the contents of the "objc_bridge_related" attribute.
/// objc_bridge_related '(' related_class ',' opt-class_method ',' opt-instance_method ')'
/// related_class:
/// Identifier
///
/// opt-class_method:
/// Identifier: | <empty>
///
/// opt-instance_method:
/// Identifier | <empty>
///
void Parser::ParseObjCBridgeRelatedAttribute(IdentifierInfo &ObjCBridgeRelated,
SourceLocation ObjCBridgeRelatedLoc,
ParsedAttributes &attrs,
SourceLocation *endLoc,
IdentifierInfo *ScopeName,
SourceLocation ScopeLoc,
AttributeList::Syntax Syntax) {
// Opening '('.
BalancedDelimiterTracker T(*this, tok::l_paren);
if (T.consumeOpen()) {
Diag(Tok, diag::err_expected) << tok::l_paren;
return;
}
// Parse the related class name.
if (Tok.isNot(tok::identifier)) {
Diag(Tok, diag::err_objcbridge_related_expected_related_class);
SkipUntil(tok::r_paren, StopAtSemi);
return;
}
IdentifierLoc *RelatedClass = ParseIdentifierLoc();
if (ExpectAndConsume(tok::comma)) {
SkipUntil(tok::r_paren, StopAtSemi);
return;
}
// Parse optional class method name.
IdentifierLoc *ClassMethod = nullptr;
if (Tok.is(tok::identifier)) {
ClassMethod = ParseIdentifierLoc();
if (!TryConsumeToken(tok::colon)) {
Diag(Tok, diag::err_objcbridge_related_selector_name);
SkipUntil(tok::r_paren, StopAtSemi);
return;
}
}
if (!TryConsumeToken(tok::comma)) {
if (Tok.is(tok::colon))
Diag(Tok, diag::err_objcbridge_related_selector_name);
else
Diag(Tok, diag::err_expected) << tok::comma;
SkipUntil(tok::r_paren, StopAtSemi);
return;
}
// Parse optional instance method name.
IdentifierLoc *InstanceMethod = nullptr;
if (Tok.is(tok::identifier))
InstanceMethod = ParseIdentifierLoc();
else if (Tok.isNot(tok::r_paren)) {
Diag(Tok, diag::err_expected) << tok::r_paren;
SkipUntil(tok::r_paren, StopAtSemi);
return;
}
// Closing ')'.
if (T.consumeClose())
return;
if (endLoc)
*endLoc = T.getCloseLocation();
// Record this attribute
attrs.addNew(&ObjCBridgeRelated,
SourceRange(ObjCBridgeRelatedLoc, T.getCloseLocation()),
ScopeName, ScopeLoc,
RelatedClass,
ClassMethod,
InstanceMethod,
Syntax);
}
// Late Parsed Attributes:
// See other examples of late parsing in lib/Parse/ParseCXXInlineMethods
void Parser::LateParsedDeclaration::ParseLexedAttributes() {}
void Parser::LateParsedClass::ParseLexedAttributes() {
Self->ParseLexedAttributes(*Class);
}
void Parser::LateParsedAttribute::ParseLexedAttributes() {
Self->ParseLexedAttribute(*this, true, false);
}
/// Wrapper class which calls ParseLexedAttribute, after setting up the
/// scope appropriately.
void Parser::ParseLexedAttributes(ParsingClass &Class) {
// Deal with templates
// FIXME: Test cases to make sure this does the right thing for templates.
bool HasTemplateScope = !Class.TopLevelClass && Class.TemplateScope;
ParseScope ClassTemplateScope(this, Scope::TemplateParamScope,
HasTemplateScope);
if (HasTemplateScope)
Actions.ActOnReenterTemplateScope(getCurScope(), Class.TagOrTemplate);
// Set or update the scope flags.
bool AlreadyHasClassScope = Class.TopLevelClass;
unsigned ScopeFlags = Scope::ClassScope|Scope::DeclScope;
ParseScope ClassScope(this, ScopeFlags, !AlreadyHasClassScope);
ParseScopeFlags ClassScopeFlags(this, ScopeFlags, AlreadyHasClassScope);
// Enter the scope of nested classes
if (!AlreadyHasClassScope)
Actions.ActOnStartDelayedMemberDeclarations(getCurScope(),
Class.TagOrTemplate);
if (!Class.LateParsedDeclarations.empty()) {
for (unsigned i = 0, ni = Class.LateParsedDeclarations.size(); i < ni; ++i){
Class.LateParsedDeclarations[i]->ParseLexedAttributes();
}
}
if (!AlreadyHasClassScope)
Actions.ActOnFinishDelayedMemberDeclarations(getCurScope(),
Class.TagOrTemplate);
}
/// \brief Parse all attributes in LAs, and attach them to Decl D.
void Parser::ParseLexedAttributeList(LateParsedAttrList &LAs, Decl *D,
bool EnterScope, bool OnDefinition) {
assert(LAs.parseSoon() &&
"Attribute list should be marked for immediate parsing.");
for (unsigned i = 0, ni = LAs.size(); i < ni; ++i) {
if (D)
LAs[i]->addDecl(D);
ParseLexedAttribute(*LAs[i], EnterScope, OnDefinition);
delete LAs[i];
}
LAs.clear();
}
/// \brief Finish parsing an attribute for which parsing was delayed.
/// This will be called at the end of parsing a class declaration
/// for each LateParsedAttribute. We consume the saved tokens and
/// create an attribute with the arguments filled in. We add this
/// to the Attribute list for the decl.
void Parser::ParseLexedAttribute(LateParsedAttribute &LA,
bool EnterScope, bool OnDefinition) {
// Create a fake EOF so that attribute parsing won't go off the end of the
// attribute.
Token AttrEnd;
AttrEnd.startToken();
AttrEnd.setKind(tok::eof);
AttrEnd.setLocation(Tok.getLocation());
AttrEnd.setEofData(LA.Toks.data());
LA.Toks.push_back(AttrEnd);
// Append the current token at the end of the new token stream so that it
// doesn't get lost.
LA.Toks.push_back(Tok);
PP.EnterTokenStream(LA.Toks, true);
// Consume the previously pushed token.
ConsumeAnyToken(/*ConsumeCodeCompletionTok=*/true);
ParsedAttributes Attrs(AttrFactory);
SourceLocation endLoc;
if (LA.Decls.size() > 0) {
Decl *D = LA.Decls[0];
NamedDecl *ND = dyn_cast<NamedDecl>(D);
RecordDecl *RD = dyn_cast_or_null<RecordDecl>(D->getDeclContext());
// Allow 'this' within late-parsed attributes.
Sema::CXXThisScopeRAII ThisScope(Actions, RD, /*TypeQuals=*/0,
ND && ND->isCXXInstanceMember());
if (LA.Decls.size() == 1) {
// If the Decl is templatized, add template parameters to scope.
bool HasTemplateScope = EnterScope && D->isTemplateDecl();
ParseScope TempScope(this, Scope::TemplateParamScope, HasTemplateScope);
if (HasTemplateScope)
Actions.ActOnReenterTemplateScope(Actions.CurScope, D);
// If the Decl is on a function, add function parameters to the scope.
bool HasFunScope = EnterScope && D->isFunctionOrFunctionTemplate();
ParseScope FnScope(this, Scope::FnScope|Scope::DeclScope, HasFunScope);
if (HasFunScope)
Actions.ActOnReenterFunctionContext(Actions.CurScope, D);
ParseGNUAttributeArgs(&LA.AttrName, LA.AttrNameLoc, Attrs, &endLoc,
nullptr, SourceLocation(), AttributeList::AS_GNU,
nullptr);
if (HasFunScope) {
Actions.ActOnExitFunctionContext();
FnScope.Exit(); // Pop scope, and remove Decls from IdResolver
}
if (HasTemplateScope) {
TempScope.Exit();
}
} else {
// If there are multiple decls, then the decl cannot be within the
// function scope.
ParseGNUAttributeArgs(&LA.AttrName, LA.AttrNameLoc, Attrs, &endLoc,
nullptr, SourceLocation(), AttributeList::AS_GNU,
nullptr);
}
} else {
Diag(Tok, diag::warn_attribute_no_decl) << LA.AttrName.getName();
}
const AttributeList *AL = Attrs.getList();
if (OnDefinition && AL && !AL->isCXX11Attribute() &&
AL->isKnownToGCC())
Diag(Tok, diag::warn_attribute_on_function_definition)
<< &LA.AttrName;
for (unsigned i = 0, ni = LA.Decls.size(); i < ni; ++i)
Actions.ActOnFinishDelayedAttribute(getCurScope(), LA.Decls[i], Attrs);
// Due to a parsing error, we either went over the cached tokens or
// there are still cached tokens left, so we skip the leftover tokens.
while (Tok.isNot(tok::eof))
ConsumeAnyToken();
if (Tok.is(tok::eof) && Tok.getEofData() == AttrEnd.getEofData())
ConsumeAnyToken();
}
void Parser::ParseTypeTagForDatatypeAttribute(IdentifierInfo &AttrName,
SourceLocation AttrNameLoc,
ParsedAttributes &Attrs,
SourceLocation *EndLoc,
IdentifierInfo *ScopeName,
SourceLocation ScopeLoc,
AttributeList::Syntax Syntax) {
assert(Tok.is(tok::l_paren) && "Attribute arg list not starting with '('");
BalancedDelimiterTracker T(*this, tok::l_paren);
T.consumeOpen();
if (Tok.isNot(tok::identifier)) {
Diag(Tok, diag::err_expected) << tok::identifier;
T.skipToEnd();
return;
}
IdentifierLoc *ArgumentKind = ParseIdentifierLoc();
if (ExpectAndConsume(tok::comma)) {
T.skipToEnd();
return;
}
SourceRange MatchingCTypeRange;
TypeResult MatchingCType = ParseTypeName(&MatchingCTypeRange);
if (MatchingCType.isInvalid()) {
T.skipToEnd();
return;
}
bool LayoutCompatible = false;
bool MustBeNull = false;
while (TryConsumeToken(tok::comma)) {
if (Tok.isNot(tok::identifier)) {
Diag(Tok, diag::err_expected) << tok::identifier;
T.skipToEnd();
return;
}
IdentifierInfo *Flag = Tok.getIdentifierInfo();
if (Flag->isStr("layout_compatible"))
LayoutCompatible = true;
else if (Flag->isStr("must_be_null"))
MustBeNull = true;
else {
Diag(Tok, diag::err_type_safety_unknown_flag) << Flag;
T.skipToEnd();
return;
}
ConsumeToken(); // consume flag
}
if (!T.consumeClose()) {
Attrs.addNewTypeTagForDatatype(&AttrName, AttrNameLoc, ScopeName, ScopeLoc,
ArgumentKind, MatchingCType.get(),
LayoutCompatible, MustBeNull, Syntax);
}
if (EndLoc)
*EndLoc = T.getCloseLocation();
}
/// DiagnoseProhibitedCXX11Attribute - We have found the opening square brackets
/// of a C++11 attribute-specifier in a location where an attribute is not
/// permitted. By C++11 [dcl.attr.grammar]p6, this is ill-formed. Diagnose this
/// situation.
///
/// \return \c true if we skipped an attribute-like chunk of tokens, \c false if
/// this doesn't appear to actually be an attribute-specifier, and the caller
/// should try to parse it.
bool Parser::DiagnoseProhibitedCXX11Attribute() {
assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square));
switch (isCXX11AttributeSpecifier(/*Disambiguate*/true)) {
case CAK_NotAttributeSpecifier:
// No diagnostic: we're in Obj-C++11 and this is not actually an attribute.
return false;
case CAK_InvalidAttributeSpecifier:
Diag(Tok.getLocation(), diag::err_l_square_l_square_not_attribute);
return false;
case CAK_AttributeSpecifier:
// Parse and discard the attributes.
SourceLocation BeginLoc = ConsumeBracket();
ConsumeBracket();
SkipUntil(tok::r_square);
assert(Tok.is(tok::r_square) && "isCXX11AttributeSpecifier lied");
SourceLocation EndLoc = ConsumeBracket();
Diag(BeginLoc, diag::err_attributes_not_allowed)
<< SourceRange(BeginLoc, EndLoc);
return true;
}
llvm_unreachable("All cases handled above.");
}
/// \brief We have found the opening square brackets of a C++11
/// attribute-specifier in a location where an attribute is not permitted, but
/// we know where the attributes ought to be written. Parse them anyway, and
/// provide a fixit moving them to the right place.
void Parser::DiagnoseMisplacedCXX11Attribute(ParsedAttributesWithRange &Attrs,
SourceLocation CorrectLocation) {
assert((Tok.is(tok::l_square) && NextToken().is(tok::l_square)) ||
Tok.is(tok::kw_alignas));
// Consume the attributes.
SourceLocation Loc = Tok.getLocation();
ParseCXX11Attributes(Attrs);
CharSourceRange AttrRange(SourceRange(Loc, Attrs.Range.getEnd()), true);
Diag(Loc, diag::err_attributes_not_allowed)
<< FixItHint::CreateInsertionFromRange(CorrectLocation, AttrRange)
<< FixItHint::CreateRemoval(AttrRange);
}
void Parser::DiagnoseProhibitedAttributes(ParsedAttributesWithRange &attrs) {
Diag(attrs.Range.getBegin(), diag::err_attributes_not_allowed)
<< attrs.Range;
}
void Parser::ProhibitCXX11Attributes(ParsedAttributesWithRange &Attrs,
unsigned DiagID) {
for (AttributeList *Attr = Attrs.getList(); Attr; Attr = Attr->getNext()) {
if (!Attr->isCXX11Attribute())
continue;
if (Attr->getKind() == AttributeList::UnknownAttribute)
Diag(Attr->getLoc(), diag::warn_unknown_attribute_ignored)
<< Attr->getName();
else {
Diag(Attr->getLoc(), DiagID)
<< Attr->getName();
Attr->setInvalid();
}
}
}
// Usually, `__attribute__((attrib)) class Foo {} var` means that attribute
// applies to var, not the type Foo.
// As an exception to the rule, __declspec(align(...)) before the
// class-key affects the type instead of the variable.
// Also, Microsoft-style [attributes] seem to affect the type instead of the
// variable.
// This function moves attributes that should apply to the type off DS to Attrs.
void Parser::stripTypeAttributesOffDeclSpec(ParsedAttributesWithRange &Attrs,
DeclSpec &DS,
Sema::TagUseKind TUK) {
if (TUK == Sema::TUK_Reference)
return;
ParsedAttributes &PA = DS.getAttributes();
AttributeList *AL = PA.getList();
AttributeList *Prev = nullptr;
AttributeList *TypeAttrHead = nullptr;
AttributeList *TypeAttrTail = nullptr;
while (AL) {
AttributeList *Next = AL->getNext();
if ((AL->getKind() == AttributeList::AT_Aligned &&
AL->isDeclspecAttribute()) ||
AL->isMicrosoftAttribute()) {
// Stitch the attribute into the tag's attribute list.
if (TypeAttrTail)
TypeAttrTail->setNext(AL);
else
TypeAttrHead = AL;
TypeAttrTail = AL;
TypeAttrTail->setNext(nullptr);
// Remove the attribute from the variable's attribute list.
if (Prev) {
// Set the last variable attribute's next attribute to be the attribute
// after the current one.
Prev->setNext(Next);
} else {
// Removing the head of the list requires us to reset the head to the
// next attribute.
PA.set(Next);
}
} else {
Prev = AL;
}
AL = Next;
}
// Find end of type attributes Attrs and add NewTypeAttributes in the same
// order they were in originally. (Remember, in AttributeList things earlier
// in source order are later in the list, since new attributes are added to
// the front of the list.)
Attrs.addAllAtEnd(TypeAttrHead);
}
/// ParseDeclaration - Parse a full 'declaration', which consists of
/// declaration-specifiers, some number of declarators, and a semicolon.
/// 'Context' should be a Declarator::TheContext value. This returns the
/// location of the semicolon in DeclEnd.
///
/// declaration: [C99 6.7]
/// block-declaration ->
/// simple-declaration
/// others [FIXME]
/// [C++] template-declaration
/// [C++] namespace-definition
/// [C++] using-directive
/// [C++] using-declaration
/// [C++11/C11] static_assert-declaration
/// others... [FIXME]
///
Parser::DeclGroupPtrTy Parser::ParseDeclaration(unsigned Context,
SourceLocation &DeclEnd,
ParsedAttributesWithRange &attrs) {
ParenBraceBracketBalancer BalancerRAIIObj(*this);
// Must temporarily exit the objective-c container scope for
// parsing c none objective-c decls.
ObjCDeclContextSwitch ObjCDC(*this);
Decl *SingleDecl = nullptr;
switch (Tok.getKind()) {
case tok::kw_template:
case tok::kw_export:
ProhibitAttributes(attrs);
SingleDecl = ParseDeclarationStartingWithTemplate(Context, DeclEnd);
break;
case tok::kw_inline:
// Could be the start of an inline namespace. Allowed as an ext in C++03.
if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_namespace)) {
ProhibitAttributes(attrs);
SourceLocation InlineLoc = ConsumeToken();
return ParseNamespace(Context, DeclEnd, InlineLoc);
}
return ParseSimpleDeclaration(Context, DeclEnd, attrs,
true);
case tok::kw_namespace:
ProhibitAttributes(attrs);
return ParseNamespace(Context, DeclEnd);
case tok::kw_using:
return ParseUsingDirectiveOrDeclaration(Context, ParsedTemplateInfo(),
DeclEnd, attrs);
case tok::kw_static_assert:
case tok::kw__Static_assert:
ProhibitAttributes(attrs);
SingleDecl = ParseStaticAssertDeclaration(DeclEnd);
break;
default:
return ParseSimpleDeclaration(Context, DeclEnd, attrs, true);
}
// This routine returns a DeclGroup, if the thing we parsed only contains a
// single decl, convert it now.
return Actions.ConvertDeclToDeclGroup(SingleDecl);
}
/// simple-declaration: [C99 6.7: declaration] [C++ 7p1: dcl.dcl]
/// declaration-specifiers init-declarator-list[opt] ';'
/// [C++11] attribute-specifier-seq decl-specifier-seq[opt]
/// init-declarator-list ';'
///[C90/C++]init-declarator-list ';' [TODO]
/// [OMP] threadprivate-directive [TODO]
///
/// for-range-declaration: [C++11 6.5p1: stmt.ranged]
/// attribute-specifier-seq[opt] type-specifier-seq declarator
///
/// If RequireSemi is false, this does not check for a ';' at the end of the
/// declaration. If it is true, it checks for and eats it.
///
/// If FRI is non-null, we might be parsing a for-range-declaration instead
/// of a simple-declaration. If we find that we are, we also parse the
/// for-range-initializer, and place it here.
Parser::DeclGroupPtrTy
Parser::ParseSimpleDeclaration(unsigned Context,
SourceLocation &DeclEnd,
ParsedAttributesWithRange &Attrs,
bool RequireSemi, ForRangeInit *FRI) {
// Parse the common declaration-specifiers piece.
ParsingDeclSpec DS(*this);
DeclSpecContext DSContext = getDeclSpecContextFromDeclaratorContext(Context);
ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS_none, DSContext);
// If we had a free-standing type definition with a missing semicolon, we
// may get this far before the problem becomes obvious.
if (DS.hasTagDefinition() &&
DiagnoseMissingSemiAfterTagDefinition(DS, AS_none, DSContext))
return nullptr;
// C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
// declaration-specifiers init-declarator-list[opt] ';'
if (Tok.is(tok::semi)) {
ProhibitAttributes(Attrs);
DeclEnd = Tok.getLocation();
if (RequireSemi) ConsumeToken();
RecordDecl *AnonRecord = nullptr;
Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS_none,
DS, AnonRecord);
DS.complete(TheDecl);
if (AnonRecord) {
Decl* decls[] = {AnonRecord, TheDecl};
return Actions.BuildDeclaratorGroup(decls);
}
return Actions.ConvertDeclToDeclGroup(TheDecl);
}
DS.takeAttributesFrom(Attrs);
return ParseDeclGroup(DS, Context, &DeclEnd, FRI);
}
/// Returns true if this might be the start of a declarator, or a common typo
/// for a declarator.
bool Parser::MightBeDeclarator(unsigned Context) {
switch (Tok.getKind()) {
case tok::annot_cxxscope:
case tok::annot_template_id:
case tok::caret:
case tok::code_completion:
case tok::coloncolon:
case tok::ellipsis:
case tok::kw___attribute:
case tok::kw_operator:
case tok::l_paren:
case tok::star:
return true;
case tok::amp:
case tok::ampamp:
return getLangOpts().CPlusPlus;
case tok::l_square: // Might be an attribute on an unnamed bit-field.
return Context == Declarator::MemberContext && getLangOpts().CPlusPlus11 &&
NextToken().is(tok::l_square);
case tok::colon: // Might be a typo for '::' or an unnamed bit-field.
return Context == Declarator::MemberContext || getLangOpts().CPlusPlus;
case tok::identifier:
switch (NextToken().getKind()) {
case tok::code_completion:
case tok::coloncolon:
case tok::comma:
case tok::equal:
case tok::equalequal: // Might be a typo for '='.
case tok::kw_alignas:
case tok::kw_asm:
case tok::kw___attribute:
case tok::l_brace:
case tok::l_paren:
case tok::l_square:
case tok::less:
case tok::r_brace:
case tok::r_paren:
case tok::r_square:
case tok::semi:
return true;
case tok::colon:
// At namespace scope, 'identifier:' is probably a typo for 'identifier::'
// and in block scope it's probably a label. Inside a class definition,
// this is a bit-field.
return Context == Declarator::MemberContext ||
(getLangOpts().CPlusPlus && Context == Declarator::FileContext);
case tok::identifier: // Possible virt-specifier.
return getLangOpts().CPlusPlus11 && isCXX11VirtSpecifier(NextToken());
default:
return false;
}
default:
return false;
}
}
/// Skip until we reach something which seems like a sensible place to pick
/// up parsing after a malformed declaration. This will sometimes stop sooner
/// than SkipUntil(tok::r_brace) would, but will never stop later.
void Parser::SkipMalformedDecl() {
while (true) {
switch (Tok.getKind()) {
case tok::l_brace:
// Skip until matching }, then stop. We've probably skipped over
// a malformed class or function definition or similar.
ConsumeBrace();
SkipUntil(tok::r_brace);
if (Tok.isOneOf(tok::comma, tok::l_brace, tok::kw_try)) {
// This declaration isn't over yet. Keep skipping.
continue;
}
TryConsumeToken(tok::semi);
return;
case tok::l_square:
ConsumeBracket();
SkipUntil(tok::r_square);
continue;
case tok::l_paren:
ConsumeParen();
SkipUntil(tok::r_paren);
continue;
case tok::r_brace:
return;
case tok::semi:
ConsumeToken();
return;
case tok::kw_inline:
// 'inline namespace' at the start of a line is almost certainly
// a good place to pick back up parsing, except in an Objective-C
// @interface context.
if (Tok.isAtStartOfLine() && NextToken().is(tok::kw_namespace) &&
(!ParsingInObjCContainer || CurParsedObjCImpl))
return;
break;
case tok::kw_namespace:
// 'namespace' at the start of a line is almost certainly a good
// place to pick back up parsing, except in an Objective-C
// @interface context.
if (Tok.isAtStartOfLine() &&
(!ParsingInObjCContainer || CurParsedObjCImpl))
return;
break;
case tok::at:
// @end is very much like } in Objective-C contexts.
if (NextToken().isObjCAtKeyword(tok::objc_end) &&
ParsingInObjCContainer)
return;
break;
case tok::minus:
case tok::plus:
// - and + probably start new method declarations in Objective-C contexts.
if (Tok.isAtStartOfLine() && ParsingInObjCContainer)
return;
break;
case tok::eof:
case tok::annot_module_begin:
case tok::annot_module_end:
case tok::annot_module_include:
return;
default:
break;
}
ConsumeAnyToken();
}
}
/// ParseDeclGroup - Having concluded that this is either a function
/// definition or a group of object declarations, actually parse the
/// result.
Parser::DeclGroupPtrTy Parser::ParseDeclGroup(ParsingDeclSpec &DS,
unsigned Context,
SourceLocation *DeclEnd,
ForRangeInit *FRI) {
// Parse the first declarator.
ParsingDeclarator D(*this, DS, static_cast<Declarator::TheContext>(Context));
ParseDeclarator(D);
// Bail out if the first declarator didn't seem well-formed.
if (!D.hasName() && !D.mayOmitIdentifier()) {
SkipMalformedDecl();
return nullptr;
}
// Save late-parsed attributes for now; they need to be parsed in the
// appropriate function scope after the function Decl has been constructed.
// These will be parsed in ParseFunctionDefinition or ParseLexedAttrList.
LateParsedAttrList LateParsedAttrs(true);
if (D.isFunctionDeclarator()) {
MaybeParseGNUAttributes(D, &LateParsedAttrs);
// The _Noreturn keyword can't appear here, unlike the GNU noreturn
// attribute. If we find the keyword here, tell the user to put it
// at the start instead.
if (Tok.is(tok::kw__Noreturn)) {
SourceLocation Loc = ConsumeToken();
const char *PrevSpec;
unsigned DiagID;
// We can offer a fixit if it's valid to mark this function as _Noreturn
// and we don't have any other declarators in this declaration.
bool Fixit = !DS.setFunctionSpecNoreturn(Loc, PrevSpec, DiagID);
MaybeParseGNUAttributes(D, &LateParsedAttrs);
Fixit &= Tok.isOneOf(tok::semi, tok::l_brace, tok::kw_try);
Diag(Loc, diag::err_c11_noreturn_misplaced)
<< (Fixit ? FixItHint::CreateRemoval(Loc) : FixItHint())
<< (Fixit ? FixItHint::CreateInsertion(D.getLocStart(), "_Noreturn ")
: FixItHint());
}
}
// Check to see if we have a function *definition* which must have a body.
if (D.isFunctionDeclarator() &&
// Look at the next token to make sure that this isn't a function
// declaration. We have to check this because __attribute__ might be the
// start of a function definition in GCC-extended K&R C.
!isDeclarationAfterDeclarator()) {
// Function definitions are only allowed at file scope and in C++ classes.
// The C++ inline method definition case is handled elsewhere, so we only
// need to handle the file scope definition case.
if (Context == Declarator::FileContext) {
if (isStartOfFunctionDefinition(D)) {
if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
Diag(Tok, diag::err_function_declared_typedef);
// Recover by treating the 'typedef' as spurious.
DS.ClearStorageClassSpecs();
}
Decl *TheDecl =
ParseFunctionDefinition(D, ParsedTemplateInfo(), &LateParsedAttrs);
return Actions.ConvertDeclToDeclGroup(TheDecl);
}
if (isDeclarationSpecifier()) {
// If there is an invalid declaration specifier right after the
// function prototype, then we must be in a missing semicolon case
// where this isn't actually a body. Just fall through into the code
// that handles it as a prototype, and let the top-level code handle
// the erroneous declspec where it would otherwise expect a comma or
// semicolon.
} else {
Diag(Tok, diag::err_expected_fn_body);
SkipUntil(tok::semi);
return nullptr;
}
} else {
if (Tok.is(tok::l_brace)) {
Diag(Tok, diag::err_function_definition_not_allowed);
SkipMalformedDecl();
return nullptr;
}
}
}
if (ParseAsmAttributesAfterDeclarator(D))
return nullptr;
// C++0x [stmt.iter]p1: Check if we have a for-range-declarator. If so, we
// must parse and analyze the for-range-initializer before the declaration is
// analyzed.
//
// Handle the Objective-C for-in loop variable similarly, although we
// don't need to parse the container in advance.
if (FRI && (Tok.is(tok::colon) || isTokIdentifier_in())) {
bool IsForRangeLoop = false;
if (TryConsumeToken(tok::colon, FRI->ColonLoc)) {
IsForRangeLoop = true;
if (Tok.is(tok::l_brace))
FRI->RangeExpr = ParseBraceInitializer();
else
FRI->RangeExpr = ParseExpression();
}
Decl *ThisDecl = Actions.ActOnDeclarator(getCurScope(), D);
if (IsForRangeLoop)
Actions.ActOnCXXForRangeDecl(ThisDecl);
Actions.FinalizeDeclaration(ThisDecl);
D.complete(ThisDecl);
return Actions.FinalizeDeclaratorGroup(getCurScope(), DS, ThisDecl);
}
SmallVector<Decl *, 8> DeclsInGroup;
Decl *FirstDecl = ParseDeclarationAfterDeclaratorAndAttributes(
D, ParsedTemplateInfo(), FRI);
if (LateParsedAttrs.size() > 0)
ParseLexedAttributeList(LateParsedAttrs, FirstDecl, true, false);
D.complete(FirstDecl);
if (FirstDecl)
DeclsInGroup.push_back(FirstDecl);
bool ExpectSemi = Context != Declarator::ForContext;
// If we don't have a comma, it is either the end of the list (a ';') or an
// error, bail out.
SourceLocation CommaLoc;
while (TryConsumeToken(tok::comma, CommaLoc)) {
if (Tok.isAtStartOfLine() && ExpectSemi && !MightBeDeclarator(Context)) {
// This comma was followed by a line-break and something which can't be
// the start of a declarator. The comma was probably a typo for a
// semicolon.
Diag(CommaLoc, diag::err_expected_semi_declaration)
<< FixItHint::CreateReplacement(CommaLoc, ";");
ExpectSemi = false;
break;
}
// Parse the next declarator.
D.clear();
D.setCommaLoc(CommaLoc);
// Accept attributes in an init-declarator. In the first declarator in a
// declaration, these would be part of the declspec. In subsequent
// declarators, they become part of the declarator itself, so that they
// don't apply to declarators after *this* one. Examples:
// short __attribute__((common)) var; -> declspec
// short var __attribute__((common)); -> declarator
// short x, __attribute__((common)) var; -> declarator
MaybeParseGNUAttributes(D);
// MSVC parses but ignores qualifiers after the comma as an extension.
if (getLangOpts().MicrosoftExt)
DiagnoseAndSkipExtendedMicrosoftTypeAttributes();
ParseDeclarator(D);
if (!D.isInvalidType()) {
Decl *ThisDecl = ParseDeclarationAfterDeclarator(D);
D.complete(ThisDecl);
if (ThisDecl)
DeclsInGroup.push_back(ThisDecl);
}
}
if (DeclEnd)
*DeclEnd = Tok.getLocation();
if (ExpectSemi &&
ExpectAndConsumeSemi(Context == Declarator::FileContext
? diag::err_invalid_token_after_toplevel_declarator
: diag::err_expected_semi_declaration)) {
// Okay, there was no semicolon and one was expected. If we see a
// declaration specifier, just assume it was missing and continue parsing.
// Otherwise things are very confused and we skip to recover.
if (!isDeclarationSpecifier()) {
SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
TryConsumeToken(tok::semi);
}
}
return Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup);
}
/// Parse an optional simple-asm-expr and attributes, and attach them to a
/// declarator. Returns true on an error.
bool Parser::ParseAsmAttributesAfterDeclarator(Declarator &D) {
// If a simple-asm-expr is present, parse it.
if (Tok.is(tok::kw_asm)) {
SourceLocation Loc;
ExprResult AsmLabel(ParseSimpleAsm(&Loc));
if (AsmLabel.isInvalid()) {
SkipUntil(tok::semi, StopBeforeMatch);
return true;
}
D.setAsmLabel(AsmLabel.get());
D.SetRangeEnd(Loc);
}
MaybeParseGNUAttributes(D);
return false;
}
/// \brief Parse 'declaration' after parsing 'declaration-specifiers
/// declarator'. This method parses the remainder of the declaration
/// (including any attributes or initializer, among other things) and
/// finalizes the declaration.
///
/// init-declarator: [C99 6.7]
/// declarator
/// declarator '=' initializer
/// [GNU] declarator simple-asm-expr[opt] attributes[opt]
/// [GNU] declarator simple-asm-expr[opt] attributes[opt] '=' initializer
/// [C++] declarator initializer[opt]
///
/// [C++] initializer:
/// [C++] '=' initializer-clause
/// [C++] '(' expression-list ')'
/// [C++0x] '=' 'default' [TODO]
/// [C++0x] '=' 'delete'
/// [C++0x] braced-init-list
///
/// According to the standard grammar, =default and =delete are function
/// definitions, but that definitely doesn't fit with the parser here.
///
Decl *Parser::ParseDeclarationAfterDeclarator(
Declarator &D, const ParsedTemplateInfo &TemplateInfo) {
if (ParseAsmAttributesAfterDeclarator(D))
return nullptr;
return ParseDeclarationAfterDeclaratorAndAttributes(D, TemplateInfo);
}
Decl *Parser::ParseDeclarationAfterDeclaratorAndAttributes(
Declarator &D, const ParsedTemplateInfo &TemplateInfo, ForRangeInit *FRI) {
// Inform the current actions module that we just parsed this declarator.
Decl *ThisDecl = nullptr;
switch (TemplateInfo.Kind) {
case ParsedTemplateInfo::NonTemplate:
ThisDecl = Actions.ActOnDeclarator(getCurScope(), D);
break;
case ParsedTemplateInfo::Template:
case ParsedTemplateInfo::ExplicitSpecialization: {
ThisDecl = Actions.ActOnTemplateDeclarator(getCurScope(),
*TemplateInfo.TemplateParams,
D);
if (VarTemplateDecl *VT = dyn_cast_or_null<VarTemplateDecl>(ThisDecl))
// Re-direct this decl to refer to the templated decl so that we can
// initialize it.
ThisDecl = VT->getTemplatedDecl();
break;
}
case ParsedTemplateInfo::ExplicitInstantiation: {
if (Tok.is(tok::semi)) {
DeclResult ThisRes = Actions.ActOnExplicitInstantiation(
getCurScope(), TemplateInfo.ExternLoc, TemplateInfo.TemplateLoc, D);
if (ThisRes.isInvalid()) {
SkipUntil(tok::semi, StopBeforeMatch);
return nullptr;
}
ThisDecl = ThisRes.get();
} else {
// FIXME: This check should be for a variable template instantiation only.
// Check that this is a valid instantiation
if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) {
// If the declarator-id is not a template-id, issue a diagnostic and
// recover by ignoring the 'template' keyword.
Diag(Tok, diag::err_template_defn_explicit_instantiation)
<< 2 << FixItHint::CreateRemoval(TemplateInfo.TemplateLoc);
ThisDecl = Actions.ActOnDeclarator(getCurScope(), D);
} else {
SourceLocation LAngleLoc =
PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
Diag(D.getIdentifierLoc(),
diag::err_explicit_instantiation_with_definition)
<< SourceRange(TemplateInfo.TemplateLoc)
<< FixItHint::CreateInsertion(LAngleLoc, "<>");
// Recover as if it were an explicit specialization.
TemplateParameterLists FakedParamLists;
FakedParamLists.push_back(Actions.ActOnTemplateParameterList(
0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, None,
LAngleLoc, nullptr));
ThisDecl =
Actions.ActOnTemplateDeclarator(getCurScope(), FakedParamLists, D);
}
}
break;
}
}
// Parse declarator '=' initializer.
// If a '==' or '+=' is found, suggest a fixit to '='.
if (isTokenEqualOrEqualTypo()) {
SourceLocation EqualLoc = ConsumeToken();
if (Tok.is(tok::kw_delete)) {
if (D.isFunctionDeclarator())
Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration)
<< 1 /* delete */;
else
Diag(ConsumeToken(), diag::err_deleted_non_function);
} else if (Tok.is(tok::kw_default)) {
if (D.isFunctionDeclarator())
Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration)
<< 0 /* default */;
else
Diag(ConsumeToken(), diag::err_default_special_members);
} else {
if (getLangOpts().CPlusPlus && D.getCXXScopeSpec().isSet()) {
EnterScope(0);
Actions.ActOnCXXEnterDeclInitializer(getCurScope(), ThisDecl);
}
if (Tok.is(tok::code_completion)) {
Actions.CodeCompleteInitializer(getCurScope(), ThisDecl);
Actions.FinalizeDeclaration(ThisDecl);
cutOffParsing();
return nullptr;
}
ExprResult Init(ParseInitializer());
// If this is the only decl in (possibly) range based for statement,
// our best guess is that the user meant ':' instead of '='.
if (Tok.is(tok::r_paren) && FRI && D.isFirstDeclarator()) {
Diag(EqualLoc, diag::err_single_decl_assign_in_for_range)
<< FixItHint::CreateReplacement(EqualLoc, ":");
// We are trying to stop parser from looking for ';' in this for
// statement, therefore preventing spurious errors to be issued.
FRI->ColonLoc = EqualLoc;
Init = ExprError();
FRI->RangeExpr = Init;
}
if (getLangOpts().CPlusPlus && D.getCXXScopeSpec().isSet()) {
Actions.ActOnCXXExitDeclInitializer(getCurScope(), ThisDecl);
ExitScope();
}
if (Init.isInvalid()) {
SmallVector<tok::TokenKind, 2> StopTokens;
StopTokens.push_back(tok::comma);
if (D.getContext() == Declarator::ForContext ||
D.getContext() == Declarator::InitStmtContext)
StopTokens.push_back(tok::r_paren);
SkipUntil(StopTokens, StopAtSemi | StopBeforeMatch);
Actions.ActOnInitializerError(ThisDecl);
} else
Actions.AddInitializerToDecl(ThisDecl, Init.get(),
/*DirectInit=*/false);
}
} else if (Tok.is(tok::l_paren)) {
// Parse C++ direct initializer: '(' expression-list ')'
BalancedDelimiterTracker T(*this, tok::l_paren);
T.consumeOpen();
ExprVector Exprs;
CommaLocsTy CommaLocs;
if (getLangOpts().CPlusPlus && D.getCXXScopeSpec().isSet()) {
EnterScope(0);
Actions.ActOnCXXEnterDeclInitializer(getCurScope(), ThisDecl);
}
if (ParseExpressionList(Exprs, CommaLocs, [&] {
Actions.CodeCompleteConstructor(getCurScope(),
cast<VarDecl>(ThisDecl)->getType()->getCanonicalTypeInternal(),
ThisDecl->getLocation(), Exprs);
})) {
Actions.ActOnInitializerError(ThisDecl);
SkipUntil(tok::r_paren, StopAtSemi);
if (getLangOpts().CPlusPlus && D.getCXXScopeSpec().isSet()) {
Actions.ActOnCXXExitDeclInitializer(getCurScope(), ThisDecl);
ExitScope();
}
} else {
// Match the ')'.
T.consumeClose();
assert(!Exprs.empty() && Exprs.size()-1 == CommaLocs.size() &&
"Unexpected number of commas!");
if (getLangOpts().CPlusPlus && D.getCXXScopeSpec().isSet()) {
Actions.ActOnCXXExitDeclInitializer(getCurScope(), ThisDecl);
ExitScope();
}
ExprResult Initializer = Actions.ActOnParenListExpr(T.getOpenLocation(),
T.getCloseLocation(),
Exprs);
Actions.AddInitializerToDecl(ThisDecl, Initializer.get(),
/*DirectInit=*/true);
}
} else if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace) &&
(!CurParsedObjCImpl || !D.isFunctionDeclarator())) {
// Parse C++0x braced-init-list.
Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
if (D.getCXXScopeSpec().isSet()) {
EnterScope(0);
Actions.ActOnCXXEnterDeclInitializer(getCurScope(), ThisDecl);
}
ExprResult Init(ParseBraceInitializer());
if (D.getCXXScopeSpec().isSet()) {
Actions.ActOnCXXExitDeclInitializer(getCurScope(), ThisDecl);
ExitScope();
}
if (Init.isInvalid()) {
Actions.ActOnInitializerError(ThisDecl);
} else
Actions.AddInitializerToDecl(ThisDecl, Init.get(), /*DirectInit=*/true);
} else {
Actions.ActOnUninitializedDecl(ThisDecl);
}
Actions.FinalizeDeclaration(ThisDecl);
return ThisDecl;
}
/// ParseSpecifierQualifierList
/// specifier-qualifier-list:
/// type-specifier specifier-qualifier-list[opt]
/// type-qualifier specifier-qualifier-list[opt]
/// [GNU] attributes specifier-qualifier-list[opt]
///
void Parser::ParseSpecifierQualifierList(DeclSpec &DS, AccessSpecifier AS,
DeclSpecContext DSC) {
/// specifier-qualifier-list is a subset of declaration-specifiers. Just
/// parse declaration-specifiers and complain about extra stuff.
/// TODO: diagnose attribute-specifiers and alignment-specifiers.
ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS, DSC);
// Validate declspec for type-name.
unsigned Specs = DS.getParsedSpecifiers();
if (isTypeSpecifier(DSC) && !DS.hasTypeSpecifier()) {
Diag(Tok, diag::err_expected_type);
DS.SetTypeSpecError();
} else if (Specs == DeclSpec::PQ_None && !DS.hasAttributes()) {
Diag(Tok, diag::err_typename_requires_specqual);
if (!DS.hasTypeSpecifier())
DS.SetTypeSpecError();
}
// Issue diagnostic and remove storage class if present.
if (Specs & DeclSpec::PQ_StorageClassSpecifier) {
if (DS.getStorageClassSpecLoc().isValid())
Diag(DS.getStorageClassSpecLoc(),diag::err_typename_invalid_storageclass);
else
Diag(DS.getThreadStorageClassSpecLoc(),
diag::err_typename_invalid_storageclass);
DS.ClearStorageClassSpecs();
}
// Issue diagnostic and remove function specifier if present.
if (Specs & DeclSpec::PQ_FunctionSpecifier) {
if (DS.isInlineSpecified())
Diag(DS.getInlineSpecLoc(), diag::err_typename_invalid_functionspec);
if (DS.isVirtualSpecified())
Diag(DS.getVirtualSpecLoc(), diag::err_typename_invalid_functionspec);
if (DS.isExplicitSpecified())
Diag(DS.getExplicitSpecLoc(), diag::err_typename_invalid_functionspec);
DS.ClearFunctionSpecs();
}
// Issue diagnostic and remove constexpr specfier if present.
if (DS.isConstexprSpecified() && DSC != DSC_condition) {
Diag(DS.getConstexprSpecLoc(), diag::err_typename_invalid_constexpr);
DS.ClearConstexprSpec();
}
}
/// isValidAfterIdentifierInDeclaratorAfterDeclSpec - Return true if the
/// specified token is valid after the identifier in a declarator which
/// immediately follows the declspec. For example, these things are valid:
///
/// int x [ 4]; // direct-declarator
/// int x ( int y); // direct-declarator
/// int(int x ) // direct-declarator
/// int x ; // simple-declaration
/// int x = 17; // init-declarator-list
/// int x , y; // init-declarator-list
/// int x __asm__ ("foo"); // init-declarator-list
/// int x : 4; // struct-declarator
/// int x { 5}; // C++'0x unified initializers
///
/// This is not, because 'x' does not immediately follow the declspec (though
/// ')' happens to be valid anyway).
/// int (x)
///
static bool isValidAfterIdentifierInDeclarator(const Token &T) {
return T.isOneOf(tok::l_square, tok::l_paren, tok::r_paren, tok::semi,
tok::comma, tok::equal, tok::kw_asm, tok::l_brace,
tok::colon);
}
/// ParseImplicitInt - This method is called when we have an non-typename
/// identifier in a declspec (which normally terminates the decl spec) when
/// the declspec has no type specifier. In this case, the declspec is either
/// malformed or is "implicit int" (in K&R and C89).
///
/// This method handles diagnosing this prettily and returns false if the
/// declspec is done being processed. If it recovers and thinks there may be
/// other pieces of declspec after it, it returns true.
///
bool Parser::ParseImplicitInt(DeclSpec &DS, CXXScopeSpec *SS,
const ParsedTemplateInfo &TemplateInfo,
AccessSpecifier AS, DeclSpecContext DSC,
ParsedAttributesWithRange &Attrs) {
assert(Tok.is(tok::identifier) && "should have identifier");
SourceLocation Loc = Tok.getLocation();
// If we see an identifier that is not a type name, we normally would
// parse it as the identifer being declared. However, when a typename
// is typo'd or the definition is not included, this will incorrectly
// parse the typename as the identifier name and fall over misparsing
// later parts of the diagnostic.
//
// As such, we try to do some look-ahead in cases where this would
// otherwise be an "implicit-int" case to see if this is invalid. For
// example: "static foo_t x = 4;" In this case, if we parsed foo_t as
// an identifier with implicit int, we'd get a parse error because the
// next token is obviously invalid for a type. Parse these as a case
// with an invalid type specifier.
assert(!DS.hasTypeSpecifier() && "Type specifier checked above");
// Since we know that this either implicit int (which is rare) or an
// error, do lookahead to try to do better recovery. This never applies
// within a type specifier. Outside of C++, we allow this even if the
// language doesn't "officially" support implicit int -- we support
// implicit int as an extension in C99 and C11.
if (!isTypeSpecifier(DSC) && !getLangOpts().CPlusPlus &&
isValidAfterIdentifierInDeclarator(NextToken())) {
// If this token is valid for implicit int, e.g. "static x = 4", then
// we just avoid eating the identifier, so it will be parsed as the
// identifier in the declarator.
return false;
}
if (getLangOpts().CPlusPlus &&
DS.getStorageClassSpec() == DeclSpec::SCS_auto) {
// Don't require a type specifier if we have the 'auto' storage class
// specifier in C++98 -- we'll promote it to a type specifier.
if (SS)
AnnotateScopeToken(*SS, /*IsNewAnnotation*/false);
return false;
}
if (getLangOpts().CPlusPlus && (!SS || SS->isEmpty()) &&
getLangOpts().MSVCCompat) {
// Lookup of an unqualified type name has failed in MSVC compatibility mode.
// Give Sema a chance to recover if we are in a template with dependent base
// classes.
if (ParsedType T = Actions.ActOnMSVCUnknownTypeName(
*Tok.getIdentifierInfo(), Tok.getLocation(),
DSC == DSC_template_type_arg)) {
const char *PrevSpec;
unsigned DiagID;
DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec, DiagID, T,
Actions.getASTContext().getPrintingPolicy());
DS.SetRangeEnd(Tok.getLocation());
ConsumeToken();
return false;
}
}
// Otherwise, if we don't consume this token, we are going to emit an
// error anyway. Try to recover from various common problems. Check
// to see if this was a reference to a tag name without a tag specified.
// This is a common problem in C (saying 'foo' instead of 'struct foo').
//
// C++ doesn't need this, and isTagName doesn't take SS.
if (SS == nullptr) {
const char *TagName = nullptr, *FixitTagName = nullptr;
tok::TokenKind TagKind = tok::unknown;
switch (Actions.isTagName(*Tok.getIdentifierInfo(), getCurScope())) {
default: break;
case DeclSpec::TST_enum:
TagName="enum" ; FixitTagName = "enum " ; TagKind=tok::kw_enum ;break;
case DeclSpec::TST_union:
TagName="union" ; FixitTagName = "union " ;TagKind=tok::kw_union ;break;
case DeclSpec::TST_struct:
TagName="struct"; FixitTagName = "struct ";TagKind=tok::kw_struct;break;
case DeclSpec::TST_interface:
TagName="__interface"; FixitTagName = "__interface ";
TagKind=tok::kw___interface;break;
case DeclSpec::TST_class:
TagName="class" ; FixitTagName = "class " ;TagKind=tok::kw_class ;break;
}
if (TagName) {
IdentifierInfo *TokenName = Tok.getIdentifierInfo();
LookupResult R(Actions, TokenName, SourceLocation(),
Sema::LookupOrdinaryName);
Diag(Loc, diag::err_use_of_tag_name_without_tag)
<< TokenName << TagName << getLangOpts().CPlusPlus
<< FixItHint::CreateInsertion(Tok.getLocation(), FixitTagName);
if (Actions.LookupParsedName(R, getCurScope(), SS)) {
for (LookupResult::iterator I = R.begin(), IEnd = R.end();
I != IEnd; ++I)
Diag((*I)->getLocation(), diag::note_decl_hiding_tag_type)
<< TokenName << TagName;
}
// Parse this as a tag as if the missing tag were present.
if (TagKind == tok::kw_enum)
ParseEnumSpecifier(Loc, DS, TemplateInfo, AS, DSC_normal);
else
ParseClassSpecifier(TagKind, Loc, DS, TemplateInfo, AS,
/*EnteringContext*/ false, DSC_normal, Attrs);
return true;
}
}
// Determine whether this identifier could plausibly be the name of something
// being declared (with a missing type).
if (!isTypeSpecifier(DSC) &&
(!SS || DSC == DSC_top_level || DSC == DSC_class)) {
// Look ahead to the next token to try to figure out what this declaration
// was supposed to be.
switch (NextToken().getKind()) {
case tok::l_paren: {
// static x(4); // 'x' is not a type
// x(int n); // 'x' is not a type
// x (*p)[]; // 'x' is a type
//
// Since we're in an error case, we can afford to perform a tentative
// parse to determine which case we're in.
TentativeParsingAction PA(*this);
ConsumeToken();
TPResult TPR = TryParseDeclarator(/*mayBeAbstract*/false);
PA.Revert();
if (TPR != TPResult::False) {
// The identifier is followed by a parenthesized declarator.
// It's supposed to be a type.
break;
}
// If we're in a context where we could be declaring a constructor,
// check whether this is a constructor declaration with a bogus name.
if (DSC == DSC_class || (DSC == DSC_top_level && SS)) {
IdentifierInfo *II = Tok.getIdentifierInfo();
if (Actions.isCurrentClassNameTypo(II, SS)) {
Diag(Loc, diag::err_constructor_bad_name)
<< Tok.getIdentifierInfo() << II
<< FixItHint::CreateReplacement(Tok.getLocation(), II->getName());
Tok.setIdentifierInfo(II);
}
}
// Fall through.
}
case tok::comma:
case tok::equal:
case tok::kw_asm:
case tok::l_brace:
case tok::l_square:
case tok::semi:
// This looks like a variable or function declaration. The type is
// probably missing. We're done parsing decl-specifiers.
if (SS)
AnnotateScopeToken(*SS, /*IsNewAnnotation*/false);
return false;
default:
// This is probably supposed to be a type. This includes cases like:
// int f(itn);
// struct S { unsinged : 4; };
break;
}
}
// This is almost certainly an invalid type name. Let Sema emit a diagnostic
// and attempt to recover.
ParsedType T;
IdentifierInfo *II = Tok.getIdentifierInfo();
Actions.DiagnoseUnknownTypeName(II, Loc, getCurScope(), SS, T,
getLangOpts().CPlusPlus &&
NextToken().is(tok::less));
if (T) {
// The action has suggested that the type T could be used. Set that as
// the type in the declaration specifiers, consume the would-be type
// name token, and we're done.
const char *PrevSpec;
unsigned DiagID;
DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec, DiagID, T,
Actions.getASTContext().getPrintingPolicy());
DS.SetRangeEnd(Tok.getLocation());
ConsumeToken();
// There may be other declaration specifiers after this.
return true;
} else if (II != Tok.getIdentifierInfo()) {
// If no type was suggested, the correction is to a keyword
Tok.setKind(II->getTokenID());
// There may be other declaration specifiers after this.
return true;
}
// Otherwise, the action had no suggestion for us. Mark this as an error.
DS.SetTypeSpecError();
DS.SetRangeEnd(Tok.getLocation());
ConsumeToken();
// TODO: Could inject an invalid typedef decl in an enclosing scope to
// avoid rippling error messages on subsequent uses of the same type,
// could be useful if #include was forgotten.
return false;
}
/// \brief Determine the declaration specifier context from the declarator
/// context.
///
/// \param Context the declarator context, which is one of the
/// Declarator::TheContext enumerator values.
Parser::DeclSpecContext
Parser::getDeclSpecContextFromDeclaratorContext(unsigned Context) {
if (Context == Declarator::MemberContext)
return DSC_class;
if (Context == Declarator::FileContext)
return DSC_top_level;
if (Context == Declarator::TemplateTypeArgContext)
return DSC_template_type_arg;
if (Context == Declarator::TrailingReturnContext)
return DSC_trailing;
if (Context == Declarator::AliasDeclContext ||
Context == Declarator::AliasTemplateContext)
return DSC_alias_declaration;
return DSC_normal;
}
/// ParseAlignArgument - Parse the argument to an alignment-specifier.
///
/// FIXME: Simply returns an alignof() expression if the argument is a
/// type. Ideally, the type should be propagated directly into Sema.
///
/// [C11] type-id
/// [C11] constant-expression
/// [C++0x] type-id ...[opt]
/// [C++0x] assignment-expression ...[opt]
ExprResult Parser::ParseAlignArgument(SourceLocation Start,
SourceLocation &EllipsisLoc) {
ExprResult ER;
if (isTypeIdInParens()) {
SourceLocation TypeLoc = Tok.getLocation();
ParsedType Ty = ParseTypeName().get();
SourceRange TypeRange(Start, Tok.getLocation());
ER = Actions.ActOnUnaryExprOrTypeTraitExpr(TypeLoc, UETT_AlignOf, true,
Ty.getAsOpaquePtr(), TypeRange);
} else
ER = ParseConstantExpression();
if (getLangOpts().CPlusPlus11)
TryConsumeToken(tok::ellipsis, EllipsisLoc);
return ER;