forked from OSchip/llvm-project
1529 lines
53 KiB
C++
1529 lines
53 KiB
C++
//===--- ParseDecl.cpp - Declaration Parsing ------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the Declaration portions of the Parser interfaces.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Parse/Parser.h"
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#include "clang/Parse/DeclSpec.h"
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#include "clang/Parse/Scope.h"
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#include "llvm/ADT/SmallSet.h"
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using namespace clang;
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//===----------------------------------------------------------------------===//
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// C99 6.7: Declarations.
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//===----------------------------------------------------------------------===//
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/// ParseTypeName
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/// type-name: [C99 6.7.6]
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/// specifier-qualifier-list abstract-declarator[opt]
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Parser::TypeTy *Parser::ParseTypeName() {
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// Parse the common declaration-specifiers piece.
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DeclSpec DS;
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ParseSpecifierQualifierList(DS);
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// Parse the abstract-declarator, if present.
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Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
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ParseDeclarator(DeclaratorInfo);
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return Actions.ActOnTypeName(CurScope, DeclaratorInfo).Val;
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}
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/// ParseAttributes - Parse a non-empty attributes list.
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///
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/// [GNU] attributes:
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/// attribute
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/// attributes attribute
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///
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/// [GNU] attribute:
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/// '__attribute__' '(' '(' attribute-list ')' ')'
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///
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/// [GNU] attribute-list:
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/// attrib
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/// attribute_list ',' attrib
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///
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/// [GNU] attrib:
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/// empty
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/// attrib-name
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/// attrib-name '(' identifier ')'
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/// attrib-name '(' identifier ',' nonempty-expr-list ')'
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/// attrib-name '(' argument-expression-list [C99 6.5.2] ')'
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///
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/// [GNU] attrib-name:
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/// identifier
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/// typespec
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/// typequal
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/// storageclass
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///
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/// FIXME: The GCC grammar/code for this construct implies we need two
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/// token lookahead. Comment from gcc: "If they start with an identifier
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/// which is followed by a comma or close parenthesis, then the arguments
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/// start with that identifier; otherwise they are an expression list."
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///
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/// At the moment, I am not doing 2 token lookahead. I am also unaware of
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/// any attributes that don't work (based on my limited testing). Most
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/// attributes are very simple in practice. Until we find a bug, I don't see
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/// a pressing need to implement the 2 token lookahead.
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AttributeList *Parser::ParseAttributes() {
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assert(Tok.is(tok::kw___attribute) && "Not an attribute list!");
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AttributeList *CurrAttr = 0;
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while (Tok.is(tok::kw___attribute)) {
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ConsumeToken();
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if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after,
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"attribute")) {
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SkipUntil(tok::r_paren, true); // skip until ) or ;
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return CurrAttr;
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}
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if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, "(")) {
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SkipUntil(tok::r_paren, true); // skip until ) or ;
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return CurrAttr;
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}
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// Parse the attribute-list. e.g. __attribute__(( weak, alias("__f") ))
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while (Tok.is(tok::identifier) || isDeclarationSpecifier() ||
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Tok.is(tok::comma)) {
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if (Tok.is(tok::comma)) {
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// allows for empty/non-empty attributes. ((__vector_size__(16),,,,))
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ConsumeToken();
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continue;
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}
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// we have an identifier or declaration specifier (const, int, etc.)
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IdentifierInfo *AttrName = Tok.getIdentifierInfo();
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SourceLocation AttrNameLoc = ConsumeToken();
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// check if we have a "paramterized" attribute
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if (Tok.is(tok::l_paren)) {
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ConsumeParen(); // ignore the left paren loc for now
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if (Tok.is(tok::identifier)) {
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IdentifierInfo *ParmName = Tok.getIdentifierInfo();
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SourceLocation ParmLoc = ConsumeToken();
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if (Tok.is(tok::r_paren)) {
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// __attribute__(( mode(byte) ))
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ConsumeParen(); // ignore the right paren loc for now
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CurrAttr = new AttributeList(AttrName, AttrNameLoc,
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ParmName, ParmLoc, 0, 0, CurrAttr);
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} else if (Tok.is(tok::comma)) {
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ConsumeToken();
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// __attribute__(( format(printf, 1, 2) ))
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llvm::SmallVector<ExprTy*, 8> ArgExprs;
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bool ArgExprsOk = true;
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// now parse the non-empty comma separated list of expressions
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while (1) {
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ExprResult ArgExpr = ParseAssignmentExpression();
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if (ArgExpr.isInvalid) {
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ArgExprsOk = false;
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SkipUntil(tok::r_paren);
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break;
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} else {
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ArgExprs.push_back(ArgExpr.Val);
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}
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if (Tok.isNot(tok::comma))
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break;
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ConsumeToken(); // Eat the comma, move to the next argument
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}
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if (ArgExprsOk && Tok.is(tok::r_paren)) {
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ConsumeParen(); // ignore the right paren loc for now
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CurrAttr = new AttributeList(AttrName, AttrNameLoc, ParmName,
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ParmLoc, &ArgExprs[0], ArgExprs.size(), CurrAttr);
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}
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}
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} else { // not an identifier
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// parse a possibly empty comma separated list of expressions
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if (Tok.is(tok::r_paren)) {
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// __attribute__(( nonnull() ))
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ConsumeParen(); // ignore the right paren loc for now
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CurrAttr = new AttributeList(AttrName, AttrNameLoc,
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0, SourceLocation(), 0, 0, CurrAttr);
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} else {
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// __attribute__(( aligned(16) ))
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llvm::SmallVector<ExprTy*, 8> ArgExprs;
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bool ArgExprsOk = true;
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// now parse the list of expressions
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while (1) {
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ExprResult ArgExpr = ParseAssignmentExpression();
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if (ArgExpr.isInvalid) {
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ArgExprsOk = false;
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SkipUntil(tok::r_paren);
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break;
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} else {
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ArgExprs.push_back(ArgExpr.Val);
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}
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if (Tok.isNot(tok::comma))
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break;
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ConsumeToken(); // Eat the comma, move to the next argument
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}
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// Match the ')'.
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if (ArgExprsOk && Tok.is(tok::r_paren)) {
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ConsumeParen(); // ignore the right paren loc for now
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CurrAttr = new AttributeList(AttrName, AttrNameLoc, 0,
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SourceLocation(), &ArgExprs[0], ArgExprs.size(),
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CurrAttr);
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}
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}
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}
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} else {
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CurrAttr = new AttributeList(AttrName, AttrNameLoc,
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0, SourceLocation(), 0, 0, CurrAttr);
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}
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}
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if (ExpectAndConsume(tok::r_paren, diag::err_expected_rparen))
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SkipUntil(tok::r_paren, false);
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if (ExpectAndConsume(tok::r_paren, diag::err_expected_rparen))
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SkipUntil(tok::r_paren, false);
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}
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return CurrAttr;
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}
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/// ParseDeclaration - Parse a full 'declaration', which consists of
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/// declaration-specifiers, some number of declarators, and a semicolon.
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/// 'Context' should be a Declarator::TheContext value.
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///
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/// declaration: [C99 6.7]
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/// block-declaration ->
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/// simple-declaration
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/// others [FIXME]
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/// [C++] namespace-definition
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/// others... [FIXME]
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///
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Parser::DeclTy *Parser::ParseDeclaration(unsigned Context) {
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switch (Tok.getKind()) {
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case tok::kw_namespace:
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return ParseNamespace(Context);
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default:
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return ParseSimpleDeclaration(Context);
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}
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}
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/// simple-declaration: [C99 6.7: declaration] [C++ 7p1: dcl.dcl]
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/// declaration-specifiers init-declarator-list[opt] ';'
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///[C90/C++]init-declarator-list ';' [TODO]
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/// [OMP] threadprivate-directive [TODO]
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Parser::DeclTy *Parser::ParseSimpleDeclaration(unsigned Context) {
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// Parse the common declaration-specifiers piece.
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DeclSpec DS;
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ParseDeclarationSpecifiers(DS);
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// C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
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// declaration-specifiers init-declarator-list[opt] ';'
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if (Tok.is(tok::semi)) {
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ConsumeToken();
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return Actions.ParsedFreeStandingDeclSpec(CurScope, DS);
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}
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Declarator DeclaratorInfo(DS, (Declarator::TheContext)Context);
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ParseDeclarator(DeclaratorInfo);
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return ParseInitDeclaratorListAfterFirstDeclarator(DeclaratorInfo);
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}
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/// ParseInitDeclaratorListAfterFirstDeclarator - Parse 'declaration' after
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/// parsing 'declaration-specifiers declarator'. This method is split out this
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/// way to handle the ambiguity between top-level function-definitions and
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/// declarations.
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///
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/// init-declarator-list: [C99 6.7]
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/// init-declarator
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/// init-declarator-list ',' init-declarator
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/// init-declarator: [C99 6.7]
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/// declarator
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/// declarator '=' initializer
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/// [GNU] declarator simple-asm-expr[opt] attributes[opt]
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/// [GNU] declarator simple-asm-expr[opt] attributes[opt] '=' initializer
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///
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Parser::DeclTy *Parser::
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ParseInitDeclaratorListAfterFirstDeclarator(Declarator &D) {
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// Declarators may be grouped together ("int X, *Y, Z();"). Provide info so
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// that they can be chained properly if the actions want this.
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Parser::DeclTy *LastDeclInGroup = 0;
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// At this point, we know that it is not a function definition. Parse the
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// rest of the init-declarator-list.
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while (1) {
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// If a simple-asm-expr is present, parse it.
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if (Tok.is(tok::kw_asm))
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ParseSimpleAsm();
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// If attributes are present, parse them.
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if (Tok.is(tok::kw___attribute))
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D.AddAttributes(ParseAttributes());
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// Inform the current actions module that we just parsed this declarator.
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// FIXME: pass asm & attributes.
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LastDeclInGroup = Actions.ActOnDeclarator(CurScope, D, LastDeclInGroup);
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// Parse declarator '=' initializer.
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ExprResult Init;
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if (Tok.is(tok::equal)) {
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ConsumeToken();
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Init = ParseInitializer();
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if (Init.isInvalid) {
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SkipUntil(tok::semi);
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return 0;
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}
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Actions.AddInitializerToDecl(LastDeclInGroup, Init.Val);
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}
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// If we don't have a comma, it is either the end of the list (a ';') or an
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// error, bail out.
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if (Tok.isNot(tok::comma))
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break;
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// Consume the comma.
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ConsumeToken();
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// Parse the next declarator.
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D.clear();
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ParseDeclarator(D);
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}
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if (Tok.is(tok::semi)) {
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ConsumeToken();
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return Actions.FinalizeDeclaratorGroup(CurScope, LastDeclInGroup);
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}
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// If this is an ObjC2 for-each loop, this is a successful declarator
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// parse. The syntax for these looks like:
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// 'for' '(' declaration 'in' expr ')' statement
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if (D.getContext() == Declarator::ForContext && isTokIdentifier_in()) {
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return Actions.FinalizeDeclaratorGroup(CurScope, LastDeclInGroup);
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}
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Diag(Tok, diag::err_parse_error);
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// Skip to end of block or statement
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SkipUntil(tok::r_brace, true, true);
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if (Tok.is(tok::semi))
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ConsumeToken();
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return 0;
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}
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/// ParseSpecifierQualifierList
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/// specifier-qualifier-list:
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/// type-specifier specifier-qualifier-list[opt]
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/// type-qualifier specifier-qualifier-list[opt]
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/// [GNU] attributes specifier-qualifier-list[opt]
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///
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void Parser::ParseSpecifierQualifierList(DeclSpec &DS) {
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/// specifier-qualifier-list is a subset of declaration-specifiers. Just
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/// parse declaration-specifiers and complain about extra stuff.
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ParseDeclarationSpecifiers(DS);
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// Validate declspec for type-name.
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unsigned Specs = DS.getParsedSpecifiers();
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if (Specs == DeclSpec::PQ_None)
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Diag(Tok, diag::err_typename_requires_specqual);
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// Issue diagnostic and remove storage class if present.
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if (Specs & DeclSpec::PQ_StorageClassSpecifier) {
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if (DS.getStorageClassSpecLoc().isValid())
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Diag(DS.getStorageClassSpecLoc(),diag::err_typename_invalid_storageclass);
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else
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Diag(DS.getThreadSpecLoc(), diag::err_typename_invalid_storageclass);
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DS.ClearStorageClassSpecs();
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}
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// Issue diagnostic and remove function specfier if present.
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if (Specs & DeclSpec::PQ_FunctionSpecifier) {
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Diag(DS.getInlineSpecLoc(), diag::err_typename_invalid_functionspec);
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DS.ClearFunctionSpecs();
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}
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}
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/// ParseDeclarationSpecifiers
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/// declaration-specifiers: [C99 6.7]
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/// storage-class-specifier declaration-specifiers[opt]
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/// type-specifier declaration-specifiers[opt]
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/// type-qualifier declaration-specifiers[opt]
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/// [C99] function-specifier declaration-specifiers[opt]
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/// [GNU] attributes declaration-specifiers[opt]
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///
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/// storage-class-specifier: [C99 6.7.1]
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/// 'typedef'
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/// 'extern'
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/// 'static'
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/// 'auto'
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/// 'register'
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/// [GNU] '__thread'
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/// type-specifier: [C99 6.7.2]
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/// 'void'
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/// 'char'
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/// 'short'
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/// 'int'
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/// 'long'
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/// 'float'
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/// 'double'
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/// 'signed'
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/// 'unsigned'
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/// struct-or-union-specifier
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/// enum-specifier
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/// typedef-name
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/// [C++] 'bool'
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/// [C99] '_Bool'
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/// [C99] '_Complex'
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/// [C99] '_Imaginary' // Removed in TC2?
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/// [GNU] '_Decimal32'
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/// [GNU] '_Decimal64'
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/// [GNU] '_Decimal128'
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/// [GNU] typeof-specifier
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/// [OBJC] class-name objc-protocol-refs[opt] [TODO]
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/// [OBJC] typedef-name objc-protocol-refs[opt] [TODO]
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/// type-qualifier:
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/// 'const'
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/// 'volatile'
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/// [C99] 'restrict'
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/// function-specifier: [C99 6.7.4]
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/// [C99] 'inline'
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///
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void Parser::ParseDeclarationSpecifiers(DeclSpec &DS) {
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DS.SetRangeStart(Tok.getLocation());
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while (1) {
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int isInvalid = false;
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const char *PrevSpec = 0;
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SourceLocation Loc = Tok.getLocation();
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switch (Tok.getKind()) {
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// typedef-name
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case tok::identifier:
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// This identifier can only be a typedef name if we haven't already seen
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// a type-specifier. Without this check we misparse:
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// typedef int X; struct Y { short X; }; as 'short int'.
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if (!DS.hasTypeSpecifier()) {
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// It has to be available as a typedef too!
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if (void *TypeRep = Actions.isTypeName(*Tok.getIdentifierInfo(),
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CurScope)) {
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isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typedef, Loc, PrevSpec,
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TypeRep);
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if (isInvalid)
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break;
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// FIXME: restrict this to "id" and ObjC classnames.
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DS.SetRangeEnd(Tok.getLocation());
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ConsumeToken(); // The identifier
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if (Tok.is(tok::less)) {
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SourceLocation endProtoLoc;
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llvm::SmallVector<IdentifierInfo *, 8> ProtocolRefs;
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ParseObjCProtocolReferences(ProtocolRefs, endProtoLoc);
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llvm::SmallVector<DeclTy *, 8> *ProtocolDecl =
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new llvm::SmallVector<DeclTy *, 8>;
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DS.setProtocolQualifiers(ProtocolDecl);
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Actions.FindProtocolDeclaration(Loc,
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&ProtocolRefs[0], ProtocolRefs.size(),
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*ProtocolDecl);
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}
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continue;
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}
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}
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// FALL THROUGH.
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default:
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// If this is not a declaration specifier token, we're done reading decl
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// specifiers. First verify that DeclSpec's are consistent.
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DS.Finish(Diags, PP.getSourceManager(), getLang());
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return;
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// GNU attributes support.
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case tok::kw___attribute:
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DS.AddAttributes(ParseAttributes());
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continue;
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// storage-class-specifier
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case tok::kw_typedef:
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isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_typedef, Loc, PrevSpec);
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break;
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case tok::kw_extern:
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if (DS.isThreadSpecified())
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Diag(Tok, diag::ext_thread_before, "extern");
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isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_extern, Loc, PrevSpec);
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break;
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case tok::kw___private_extern__:
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isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_private_extern, Loc,
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PrevSpec);
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break;
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case tok::kw_static:
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if (DS.isThreadSpecified())
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Diag(Tok, diag::ext_thread_before, "static");
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isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_static, Loc, PrevSpec);
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break;
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case tok::kw_auto:
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isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_auto, Loc, PrevSpec);
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break;
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case tok::kw_register:
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isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_register, Loc, PrevSpec);
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break;
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case tok::kw___thread:
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isInvalid = DS.SetStorageClassSpecThread(Loc, PrevSpec)*2;
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break;
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// type-specifiers
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case tok::kw_short:
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isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_short, Loc, PrevSpec);
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break;
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case tok::kw_long:
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if (DS.getTypeSpecWidth() != DeclSpec::TSW_long)
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isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_long, Loc, PrevSpec);
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else
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isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_longlong, Loc, PrevSpec);
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break;
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case tok::kw_signed:
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isInvalid = DS.SetTypeSpecSign(DeclSpec::TSS_signed, Loc, PrevSpec);
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break;
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case tok::kw_unsigned:
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isInvalid = DS.SetTypeSpecSign(DeclSpec::TSS_unsigned, Loc, PrevSpec);
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break;
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case tok::kw__Complex:
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isInvalid = DS.SetTypeSpecComplex(DeclSpec::TSC_complex, Loc, PrevSpec);
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break;
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case tok::kw__Imaginary:
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isInvalid = DS.SetTypeSpecComplex(DeclSpec::TSC_imaginary, Loc, PrevSpec);
|
|
break;
|
|
case tok::kw_void:
|
|
isInvalid = DS.SetTypeSpecType(DeclSpec::TST_void, Loc, PrevSpec);
|
|
break;
|
|
case tok::kw_char:
|
|
isInvalid = DS.SetTypeSpecType(DeclSpec::TST_char, Loc, PrevSpec);
|
|
break;
|
|
case tok::kw_int:
|
|
isInvalid = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, PrevSpec);
|
|
break;
|
|
case tok::kw_float:
|
|
isInvalid = DS.SetTypeSpecType(DeclSpec::TST_float, Loc, PrevSpec);
|
|
break;
|
|
case tok::kw_double:
|
|
isInvalid = DS.SetTypeSpecType(DeclSpec::TST_double, Loc, PrevSpec);
|
|
break;
|
|
case tok::kw_bool: // [C++ 2.11p1]
|
|
case tok::kw__Bool:
|
|
isInvalid = DS.SetTypeSpecType(DeclSpec::TST_bool, Loc, PrevSpec);
|
|
break;
|
|
case tok::kw__Decimal32:
|
|
isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal32, Loc, PrevSpec);
|
|
break;
|
|
case tok::kw__Decimal64:
|
|
isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal64, Loc, PrevSpec);
|
|
break;
|
|
case tok::kw__Decimal128:
|
|
isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal128, Loc, PrevSpec);
|
|
break;
|
|
|
|
case tok::kw_class:
|
|
case tok::kw_struct:
|
|
case tok::kw_union:
|
|
ParseClassSpecifier(DS);
|
|
continue;
|
|
case tok::kw_enum:
|
|
ParseEnumSpecifier(DS);
|
|
continue;
|
|
|
|
// GNU typeof support.
|
|
case tok::kw_typeof:
|
|
ParseTypeofSpecifier(DS);
|
|
continue;
|
|
|
|
// type-qualifier
|
|
case tok::kw_const:
|
|
isInvalid = DS.SetTypeQual(DeclSpec::TQ_const , Loc, PrevSpec,
|
|
getLang())*2;
|
|
break;
|
|
case tok::kw_volatile:
|
|
isInvalid = DS.SetTypeQual(DeclSpec::TQ_volatile, Loc, PrevSpec,
|
|
getLang())*2;
|
|
break;
|
|
case tok::kw_restrict:
|
|
isInvalid = DS.SetTypeQual(DeclSpec::TQ_restrict, Loc, PrevSpec,
|
|
getLang())*2;
|
|
break;
|
|
|
|
// function-specifier
|
|
case tok::kw_inline:
|
|
isInvalid = DS.SetFunctionSpecInline(Loc, PrevSpec);
|
|
break;
|
|
}
|
|
// If the specifier combination wasn't legal, issue a diagnostic.
|
|
if (isInvalid) {
|
|
assert(PrevSpec && "Method did not return previous specifier!");
|
|
if (isInvalid == 1) // Error.
|
|
Diag(Tok, diag::err_invalid_decl_spec_combination, PrevSpec);
|
|
else // extwarn.
|
|
Diag(Tok, diag::ext_duplicate_declspec, PrevSpec);
|
|
}
|
|
DS.SetRangeEnd(Tok.getLocation());
|
|
ConsumeToken();
|
|
}
|
|
}
|
|
|
|
/// ParseTag - Parse "struct-or-union-or-class-or-enum identifier[opt]", where
|
|
/// the first token has already been read and has been turned into an instance
|
|
/// of DeclSpec::TST (TagType). This returns true if there is an error parsing,
|
|
/// otherwise it returns false and fills in Decl.
|
|
bool Parser::ParseTag(DeclTy *&Decl, unsigned TagType, SourceLocation StartLoc){
|
|
AttributeList *Attr = 0;
|
|
// If attributes exist after tag, parse them.
|
|
if (Tok.is(tok::kw___attribute))
|
|
Attr = ParseAttributes();
|
|
|
|
// Must have either 'struct name' or 'struct {...}'.
|
|
if (Tok.isNot(tok::identifier) && Tok.isNot(tok::l_brace)) {
|
|
Diag(Tok, diag::err_expected_ident_lbrace);
|
|
|
|
// Skip the rest of this declarator, up until the comma or semicolon.
|
|
SkipUntil(tok::comma, true);
|
|
return true;
|
|
}
|
|
|
|
// If an identifier is present, consume and remember it.
|
|
IdentifierInfo *Name = 0;
|
|
SourceLocation NameLoc;
|
|
if (Tok.is(tok::identifier)) {
|
|
Name = Tok.getIdentifierInfo();
|
|
NameLoc = ConsumeToken();
|
|
}
|
|
|
|
// There are three options here. If we have 'struct foo;', then this is a
|
|
// forward declaration. If we have 'struct foo {...' then this is a
|
|
// definition. Otherwise we have something like 'struct foo xyz', a reference.
|
|
//
|
|
// This is needed to handle stuff like this right (C99 6.7.2.3p11):
|
|
// struct foo {..}; void bar() { struct foo; } <- new foo in bar.
|
|
// struct foo {..}; void bar() { struct foo x; } <- use of old foo.
|
|
//
|
|
Action::TagKind TK;
|
|
if (Tok.is(tok::l_brace))
|
|
TK = Action::TK_Definition;
|
|
else if (Tok.is(tok::semi))
|
|
TK = Action::TK_Declaration;
|
|
else
|
|
TK = Action::TK_Reference;
|
|
Decl = Actions.ActOnTag(CurScope, TagType, TK, StartLoc, Name, NameLoc, Attr);
|
|
return false;
|
|
}
|
|
|
|
/// ParseStructDeclaration - Parse a struct declaration without the terminating
|
|
/// semicolon.
|
|
///
|
|
/// struct-declaration:
|
|
/// specifier-qualifier-list struct-declarator-list
|
|
/// [GNU] __extension__ struct-declaration
|
|
/// [GNU] specifier-qualifier-list
|
|
/// struct-declarator-list:
|
|
/// struct-declarator
|
|
/// struct-declarator-list ',' struct-declarator
|
|
/// [GNU] struct-declarator-list ',' attributes[opt] struct-declarator
|
|
/// struct-declarator:
|
|
/// declarator
|
|
/// [GNU] declarator attributes[opt]
|
|
/// declarator[opt] ':' constant-expression
|
|
/// [GNU] declarator[opt] ':' constant-expression attributes[opt]
|
|
///
|
|
void Parser::
|
|
ParseStructDeclaration(DeclSpec &DS,
|
|
llvm::SmallVectorImpl<FieldDeclarator> &Fields) {
|
|
// FIXME: When __extension__ is specified, disable extension diagnostics.
|
|
while (Tok.is(tok::kw___extension__))
|
|
ConsumeToken();
|
|
|
|
// Parse the common specifier-qualifiers-list piece.
|
|
SourceLocation DSStart = Tok.getLocation();
|
|
ParseSpecifierQualifierList(DS);
|
|
// TODO: Does specifier-qualifier list correctly check that *something* is
|
|
// specified?
|
|
|
|
// If there are no declarators, issue a warning.
|
|
if (Tok.is(tok::semi)) {
|
|
Diag(DSStart, diag::w_no_declarators);
|
|
return;
|
|
}
|
|
|
|
// Read struct-declarators until we find the semicolon.
|
|
Fields.push_back(FieldDeclarator(DS));
|
|
while (1) {
|
|
FieldDeclarator &DeclaratorInfo = Fields.back();
|
|
|
|
/// struct-declarator: declarator
|
|
/// struct-declarator: declarator[opt] ':' constant-expression
|
|
if (Tok.isNot(tok::colon))
|
|
ParseDeclarator(DeclaratorInfo.D);
|
|
|
|
if (Tok.is(tok::colon)) {
|
|
ConsumeToken();
|
|
ExprResult Res = ParseConstantExpression();
|
|
if (Res.isInvalid)
|
|
SkipUntil(tok::semi, true, true);
|
|
else
|
|
DeclaratorInfo.BitfieldSize = Res.Val;
|
|
}
|
|
|
|
// If attributes exist after the declarator, parse them.
|
|
if (Tok.is(tok::kw___attribute))
|
|
DeclaratorInfo.D.AddAttributes(ParseAttributes());
|
|
|
|
// If we don't have a comma, it is either the end of the list (a ';')
|
|
// or an error, bail out.
|
|
if (Tok.isNot(tok::comma))
|
|
return;
|
|
|
|
// Consume the comma.
|
|
ConsumeToken();
|
|
|
|
// Parse the next declarator.
|
|
Fields.push_back(FieldDeclarator(DS));
|
|
|
|
// Attributes are only allowed on the second declarator.
|
|
if (Tok.is(tok::kw___attribute))
|
|
Fields.back().D.AddAttributes(ParseAttributes());
|
|
}
|
|
}
|
|
|
|
/// ParseStructUnionBody
|
|
/// struct-contents:
|
|
/// struct-declaration-list
|
|
/// [EXT] empty
|
|
/// [GNU] "struct-declaration-list" without terminatoring ';'
|
|
/// struct-declaration-list:
|
|
/// struct-declaration
|
|
/// struct-declaration-list struct-declaration
|
|
/// [OBC] '@' 'defs' '(' class-name ')' [TODO]
|
|
///
|
|
void Parser::ParseStructUnionBody(SourceLocation RecordLoc,
|
|
unsigned TagType, DeclTy *TagDecl) {
|
|
SourceLocation LBraceLoc = ConsumeBrace();
|
|
|
|
// Empty structs are an extension in C (C99 6.7.2.1p7), but are allowed in
|
|
// C++.
|
|
if (Tok.is(tok::r_brace) && !getLang().CPlusPlus)
|
|
Diag(Tok, diag::ext_empty_struct_union_enum,
|
|
DeclSpec::getSpecifierName((DeclSpec::TST)TagType));
|
|
|
|
llvm::SmallVector<DeclTy*, 32> FieldDecls;
|
|
llvm::SmallVector<FieldDeclarator, 8> FieldDeclarators;
|
|
|
|
// While we still have something to read, read the declarations in the struct.
|
|
while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
|
|
// Each iteration of this loop reads one struct-declaration.
|
|
|
|
// Check for extraneous top-level semicolon.
|
|
if (Tok.is(tok::semi)) {
|
|
Diag(Tok, diag::ext_extra_struct_semi);
|
|
ConsumeToken();
|
|
continue;
|
|
}
|
|
|
|
// Parse all the comma separated declarators.
|
|
DeclSpec DS;
|
|
FieldDeclarators.clear();
|
|
ParseStructDeclaration(DS, FieldDeclarators);
|
|
|
|
// Convert them all to fields.
|
|
for (unsigned i = 0, e = FieldDeclarators.size(); i != e; ++i) {
|
|
FieldDeclarator &FD = FieldDeclarators[i];
|
|
// Install the declarator into the current TagDecl.
|
|
DeclTy *Field = Actions.ActOnField(CurScope,
|
|
DS.getSourceRange().getBegin(),
|
|
FD.D, FD.BitfieldSize);
|
|
FieldDecls.push_back(Field);
|
|
}
|
|
|
|
|
|
if (Tok.is(tok::semi)) {
|
|
ConsumeToken();
|
|
} else if (Tok.is(tok::r_brace)) {
|
|
Diag(Tok.getLocation(), diag::ext_expected_semi_decl_list);
|
|
break;
|
|
} else {
|
|
Diag(Tok, diag::err_expected_semi_decl_list);
|
|
// Skip to end of block or statement
|
|
SkipUntil(tok::r_brace, true, true);
|
|
}
|
|
}
|
|
|
|
SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc);
|
|
|
|
Actions.ActOnFields(CurScope,
|
|
RecordLoc,TagDecl,&FieldDecls[0],FieldDecls.size(),
|
|
LBraceLoc, RBraceLoc);
|
|
|
|
AttributeList *AttrList = 0;
|
|
// If attributes exist after struct contents, parse them.
|
|
if (Tok.is(tok::kw___attribute))
|
|
AttrList = ParseAttributes(); // FIXME: where should I put them?
|
|
}
|
|
|
|
|
|
/// ParseEnumSpecifier
|
|
/// enum-specifier: [C99 6.7.2.2]
|
|
/// 'enum' identifier[opt] '{' enumerator-list '}'
|
|
/// [C99] 'enum' identifier[opt] '{' enumerator-list ',' '}'
|
|
/// [GNU] 'enum' attributes[opt] identifier[opt] '{' enumerator-list ',' [opt]
|
|
/// '}' attributes[opt]
|
|
/// 'enum' identifier
|
|
/// [GNU] 'enum' attributes[opt] identifier
|
|
void Parser::ParseEnumSpecifier(DeclSpec &DS) {
|
|
assert(Tok.is(tok::kw_enum) && "Not an enum specifier");
|
|
SourceLocation StartLoc = ConsumeToken();
|
|
|
|
// Parse the tag portion of this.
|
|
DeclTy *TagDecl;
|
|
if (ParseTag(TagDecl, DeclSpec::TST_enum, StartLoc))
|
|
return;
|
|
|
|
if (Tok.is(tok::l_brace))
|
|
ParseEnumBody(StartLoc, TagDecl);
|
|
|
|
// TODO: semantic analysis on the declspec for enums.
|
|
const char *PrevSpec = 0;
|
|
if (DS.SetTypeSpecType(DeclSpec::TST_enum, StartLoc, PrevSpec, TagDecl))
|
|
Diag(StartLoc, diag::err_invalid_decl_spec_combination, PrevSpec);
|
|
}
|
|
|
|
/// ParseEnumBody - Parse a {} enclosed enumerator-list.
|
|
/// enumerator-list:
|
|
/// enumerator
|
|
/// enumerator-list ',' enumerator
|
|
/// enumerator:
|
|
/// enumeration-constant
|
|
/// enumeration-constant '=' constant-expression
|
|
/// enumeration-constant:
|
|
/// identifier
|
|
///
|
|
void Parser::ParseEnumBody(SourceLocation StartLoc, DeclTy *EnumDecl) {
|
|
SourceLocation LBraceLoc = ConsumeBrace();
|
|
|
|
// C does not allow an empty enumerator-list, C++ does [dcl.enum].
|
|
if (Tok.is(tok::r_brace) && !getLang().CPlusPlus)
|
|
Diag(Tok, diag::ext_empty_struct_union_enum, "enum");
|
|
|
|
llvm::SmallVector<DeclTy*, 32> EnumConstantDecls;
|
|
|
|
DeclTy *LastEnumConstDecl = 0;
|
|
|
|
// Parse the enumerator-list.
|
|
while (Tok.is(tok::identifier)) {
|
|
IdentifierInfo *Ident = Tok.getIdentifierInfo();
|
|
SourceLocation IdentLoc = ConsumeToken();
|
|
|
|
SourceLocation EqualLoc;
|
|
ExprTy *AssignedVal = 0;
|
|
if (Tok.is(tok::equal)) {
|
|
EqualLoc = ConsumeToken();
|
|
ExprResult Res = ParseConstantExpression();
|
|
if (Res.isInvalid)
|
|
SkipUntil(tok::comma, tok::r_brace, true, true);
|
|
else
|
|
AssignedVal = Res.Val;
|
|
}
|
|
|
|
// Install the enumerator constant into EnumDecl.
|
|
DeclTy *EnumConstDecl = Actions.ActOnEnumConstant(CurScope, EnumDecl,
|
|
LastEnumConstDecl,
|
|
IdentLoc, Ident,
|
|
EqualLoc, AssignedVal);
|
|
EnumConstantDecls.push_back(EnumConstDecl);
|
|
LastEnumConstDecl = EnumConstDecl;
|
|
|
|
if (Tok.isNot(tok::comma))
|
|
break;
|
|
SourceLocation CommaLoc = ConsumeToken();
|
|
|
|
if (Tok.isNot(tok::identifier) && !getLang().C99)
|
|
Diag(CommaLoc, diag::ext_c99_enumerator_list_comma);
|
|
}
|
|
|
|
// Eat the }.
|
|
MatchRHSPunctuation(tok::r_brace, LBraceLoc);
|
|
|
|
Actions.ActOnEnumBody(StartLoc, EnumDecl, &EnumConstantDecls[0],
|
|
EnumConstantDecls.size());
|
|
|
|
DeclTy *AttrList = 0;
|
|
// If attributes exist after the identifier list, parse them.
|
|
if (Tok.is(tok::kw___attribute))
|
|
AttrList = ParseAttributes(); // FIXME: where do they do?
|
|
}
|
|
|
|
/// isTypeSpecifierQualifier - Return true if the current token could be the
|
|
/// start of a type-qualifier-list.
|
|
bool Parser::isTypeQualifier() const {
|
|
switch (Tok.getKind()) {
|
|
default: return false;
|
|
// type-qualifier
|
|
case tok::kw_const:
|
|
case tok::kw_volatile:
|
|
case tok::kw_restrict:
|
|
return true;
|
|
}
|
|
}
|
|
|
|
/// isTypeSpecifierQualifier - Return true if the current token could be the
|
|
/// start of a specifier-qualifier-list.
|
|
bool Parser::isTypeSpecifierQualifier() const {
|
|
switch (Tok.getKind()) {
|
|
default: return false;
|
|
// GNU attributes support.
|
|
case tok::kw___attribute:
|
|
// GNU typeof support.
|
|
case tok::kw_typeof:
|
|
|
|
// type-specifiers
|
|
case tok::kw_short:
|
|
case tok::kw_long:
|
|
case tok::kw_signed:
|
|
case tok::kw_unsigned:
|
|
case tok::kw__Complex:
|
|
case tok::kw__Imaginary:
|
|
case tok::kw_void:
|
|
case tok::kw_char:
|
|
case tok::kw_int:
|
|
case tok::kw_float:
|
|
case tok::kw_double:
|
|
case tok::kw_bool:
|
|
case tok::kw__Bool:
|
|
case tok::kw__Decimal32:
|
|
case tok::kw__Decimal64:
|
|
case tok::kw__Decimal128:
|
|
|
|
// struct-or-union-specifier (C99) or class-specifier (C++)
|
|
case tok::kw_class:
|
|
case tok::kw_struct:
|
|
case tok::kw_union:
|
|
// enum-specifier
|
|
case tok::kw_enum:
|
|
|
|
// type-qualifier
|
|
case tok::kw_const:
|
|
case tok::kw_volatile:
|
|
case tok::kw_restrict:
|
|
return true;
|
|
|
|
// typedef-name
|
|
case tok::identifier:
|
|
return Actions.isTypeName(*Tok.getIdentifierInfo(), CurScope) != 0;
|
|
}
|
|
}
|
|
|
|
/// isDeclarationSpecifier() - Return true if the current token is part of a
|
|
/// declaration specifier.
|
|
bool Parser::isDeclarationSpecifier() const {
|
|
switch (Tok.getKind()) {
|
|
default: return false;
|
|
// storage-class-specifier
|
|
case tok::kw_typedef:
|
|
case tok::kw_extern:
|
|
case tok::kw___private_extern__:
|
|
case tok::kw_static:
|
|
case tok::kw_auto:
|
|
case tok::kw_register:
|
|
case tok::kw___thread:
|
|
|
|
// type-specifiers
|
|
case tok::kw_short:
|
|
case tok::kw_long:
|
|
case tok::kw_signed:
|
|
case tok::kw_unsigned:
|
|
case tok::kw__Complex:
|
|
case tok::kw__Imaginary:
|
|
case tok::kw_void:
|
|
case tok::kw_char:
|
|
case tok::kw_int:
|
|
case tok::kw_float:
|
|
case tok::kw_double:
|
|
case tok::kw_bool:
|
|
case tok::kw__Bool:
|
|
case tok::kw__Decimal32:
|
|
case tok::kw__Decimal64:
|
|
case tok::kw__Decimal128:
|
|
|
|
// struct-or-union-specifier (C99) or class-specifier (C++)
|
|
case tok::kw_class:
|
|
case tok::kw_struct:
|
|
case tok::kw_union:
|
|
// enum-specifier
|
|
case tok::kw_enum:
|
|
|
|
// type-qualifier
|
|
case tok::kw_const:
|
|
case tok::kw_volatile:
|
|
case tok::kw_restrict:
|
|
|
|
// function-specifier
|
|
case tok::kw_inline:
|
|
|
|
// GNU typeof support.
|
|
case tok::kw_typeof:
|
|
|
|
// GNU attributes.
|
|
case tok::kw___attribute:
|
|
return true;
|
|
|
|
// typedef-name
|
|
case tok::identifier:
|
|
return Actions.isTypeName(*Tok.getIdentifierInfo(), CurScope) != 0;
|
|
}
|
|
}
|
|
|
|
|
|
/// ParseTypeQualifierListOpt
|
|
/// type-qualifier-list: [C99 6.7.5]
|
|
/// type-qualifier
|
|
/// [GNU] attributes
|
|
/// type-qualifier-list type-qualifier
|
|
/// [GNU] type-qualifier-list attributes
|
|
///
|
|
void Parser::ParseTypeQualifierListOpt(DeclSpec &DS) {
|
|
while (1) {
|
|
int isInvalid = false;
|
|
const char *PrevSpec = 0;
|
|
SourceLocation Loc = Tok.getLocation();
|
|
|
|
switch (Tok.getKind()) {
|
|
default:
|
|
// If this is not a type-qualifier token, we're done reading type
|
|
// qualifiers. First verify that DeclSpec's are consistent.
|
|
DS.Finish(Diags, PP.getSourceManager(), getLang());
|
|
return;
|
|
case tok::kw_const:
|
|
isInvalid = DS.SetTypeQual(DeclSpec::TQ_const , Loc, PrevSpec,
|
|
getLang())*2;
|
|
break;
|
|
case tok::kw_volatile:
|
|
isInvalid = DS.SetTypeQual(DeclSpec::TQ_volatile, Loc, PrevSpec,
|
|
getLang())*2;
|
|
break;
|
|
case tok::kw_restrict:
|
|
isInvalid = DS.SetTypeQual(DeclSpec::TQ_restrict, Loc, PrevSpec,
|
|
getLang())*2;
|
|
break;
|
|
case tok::kw___attribute:
|
|
DS.AddAttributes(ParseAttributes());
|
|
continue; // do *not* consume the next token!
|
|
}
|
|
|
|
// If the specifier combination wasn't legal, issue a diagnostic.
|
|
if (isInvalid) {
|
|
assert(PrevSpec && "Method did not return previous specifier!");
|
|
if (isInvalid == 1) // Error.
|
|
Diag(Tok, diag::err_invalid_decl_spec_combination, PrevSpec);
|
|
else // extwarn.
|
|
Diag(Tok, diag::ext_duplicate_declspec, PrevSpec);
|
|
}
|
|
ConsumeToken();
|
|
}
|
|
}
|
|
|
|
|
|
/// ParseDeclarator - Parse and verify a newly-initialized declarator.
|
|
///
|
|
void Parser::ParseDeclarator(Declarator &D) {
|
|
/// This implements the 'declarator' production in the C grammar, then checks
|
|
/// for well-formedness and issues diagnostics.
|
|
ParseDeclaratorInternal(D);
|
|
}
|
|
|
|
/// ParseDeclaratorInternal
|
|
/// declarator: [C99 6.7.5]
|
|
/// pointer[opt] direct-declarator
|
|
/// [C++] '&' declarator [C++ 8p4, dcl.decl]
|
|
/// [GNU] '&' restrict[opt] attributes[opt] declarator
|
|
///
|
|
/// pointer: [C99 6.7.5]
|
|
/// '*' type-qualifier-list[opt]
|
|
/// '*' type-qualifier-list[opt] pointer
|
|
///
|
|
void Parser::ParseDeclaratorInternal(Declarator &D) {
|
|
tok::TokenKind Kind = Tok.getKind();
|
|
|
|
// Not a pointer or C++ reference.
|
|
if (Kind != tok::star && (Kind != tok::amp || !getLang().CPlusPlus))
|
|
return ParseDirectDeclarator(D);
|
|
|
|
// Otherwise, '*' -> pointer or '&' -> reference.
|
|
SourceLocation Loc = ConsumeToken(); // Eat the * or &.
|
|
|
|
if (Kind == tok::star) {
|
|
// Is a pointer.
|
|
DeclSpec DS;
|
|
|
|
ParseTypeQualifierListOpt(DS);
|
|
|
|
// Recursively parse the declarator.
|
|
ParseDeclaratorInternal(D);
|
|
|
|
// Remember that we parsed a pointer type, and remember the type-quals.
|
|
D.AddTypeInfo(DeclaratorChunk::getPointer(DS.getTypeQualifiers(), Loc,
|
|
DS.TakeAttributes()));
|
|
} else {
|
|
// Is a reference
|
|
DeclSpec DS;
|
|
|
|
// C++ 8.3.2p1: cv-qualified references are ill-formed except when the
|
|
// cv-qualifiers are introduced through the use of a typedef or of a
|
|
// template type argument, in which case the cv-qualifiers are ignored.
|
|
//
|
|
// [GNU] Retricted references are allowed.
|
|
// [GNU] Attributes on references are allowed.
|
|
ParseTypeQualifierListOpt(DS);
|
|
|
|
if (DS.getTypeQualifiers() != DeclSpec::TQ_unspecified) {
|
|
if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
|
|
Diag(DS.getConstSpecLoc(),
|
|
diag::err_invalid_reference_qualifier_application,
|
|
"const");
|
|
if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
|
|
Diag(DS.getVolatileSpecLoc(),
|
|
diag::err_invalid_reference_qualifier_application,
|
|
"volatile");
|
|
}
|
|
|
|
// Recursively parse the declarator.
|
|
ParseDeclaratorInternal(D);
|
|
|
|
// Remember that we parsed a reference type. It doesn't have type-quals.
|
|
D.AddTypeInfo(DeclaratorChunk::getReference(DS.getTypeQualifiers(), Loc,
|
|
DS.TakeAttributes()));
|
|
}
|
|
}
|
|
|
|
/// ParseDirectDeclarator
|
|
/// direct-declarator: [C99 6.7.5]
|
|
/// identifier
|
|
/// '(' declarator ')'
|
|
/// [GNU] '(' attributes declarator ')'
|
|
/// [C90] direct-declarator '[' constant-expression[opt] ']'
|
|
/// [C99] direct-declarator '[' type-qual-list[opt] assignment-expr[opt] ']'
|
|
/// [C99] direct-declarator '[' 'static' type-qual-list[opt] assign-expr ']'
|
|
/// [C99] direct-declarator '[' type-qual-list 'static' assignment-expr ']'
|
|
/// [C99] direct-declarator '[' type-qual-list[opt] '*' ']'
|
|
/// direct-declarator '(' parameter-type-list ')'
|
|
/// direct-declarator '(' identifier-list[opt] ')'
|
|
/// [GNU] direct-declarator '(' parameter-forward-declarations
|
|
/// parameter-type-list[opt] ')'
|
|
///
|
|
void Parser::ParseDirectDeclarator(Declarator &D) {
|
|
// Parse the first direct-declarator seen.
|
|
if (Tok.is(tok::identifier) && D.mayHaveIdentifier()) {
|
|
assert(Tok.getIdentifierInfo() && "Not an identifier?");
|
|
D.SetIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
|
|
ConsumeToken();
|
|
} else if (Tok.is(tok::l_paren)) {
|
|
// direct-declarator: '(' declarator ')'
|
|
// direct-declarator: '(' attributes declarator ')'
|
|
// Example: 'char (*X)' or 'int (*XX)(void)'
|
|
ParseParenDeclarator(D);
|
|
} else if (D.mayOmitIdentifier()) {
|
|
// This could be something simple like "int" (in which case the declarator
|
|
// portion is empty), if an abstract-declarator is allowed.
|
|
D.SetIdentifier(0, Tok.getLocation());
|
|
} else {
|
|
// Expected identifier or '('.
|
|
Diag(Tok, diag::err_expected_ident_lparen);
|
|
D.SetIdentifier(0, Tok.getLocation());
|
|
}
|
|
|
|
assert(D.isPastIdentifier() &&
|
|
"Haven't past the location of the identifier yet?");
|
|
|
|
while (1) {
|
|
if (Tok.is(tok::l_paren)) {
|
|
ParseFunctionDeclarator(ConsumeParen(), D);
|
|
} else if (Tok.is(tok::l_square)) {
|
|
ParseBracketDeclarator(D);
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// ParseParenDeclarator - We parsed the declarator D up to a paren. This is
|
|
/// only called before the identifier, so these are most likely just grouping
|
|
/// parens for precedence. If we find that these are actually function
|
|
/// parameter parens in an abstract-declarator, we call ParseFunctionDeclarator.
|
|
///
|
|
/// direct-declarator:
|
|
/// '(' declarator ')'
|
|
/// [GNU] '(' attributes declarator ')'
|
|
///
|
|
void Parser::ParseParenDeclarator(Declarator &D) {
|
|
SourceLocation StartLoc = ConsumeParen();
|
|
assert(!D.isPastIdentifier() && "Should be called before passing identifier");
|
|
|
|
// If we haven't past the identifier yet (or where the identifier would be
|
|
// stored, if this is an abstract declarator), then this is probably just
|
|
// grouping parens. However, if this could be an abstract-declarator, then
|
|
// this could also be the start of function arguments (consider 'void()').
|
|
bool isGrouping;
|
|
|
|
if (!D.mayOmitIdentifier()) {
|
|
// If this can't be an abstract-declarator, this *must* be a grouping
|
|
// paren, because we haven't seen the identifier yet.
|
|
isGrouping = true;
|
|
} else if (Tok.is(tok::r_paren) || // 'int()' is a function.
|
|
isDeclarationSpecifier()) { // 'int(int)' is a function.
|
|
// This handles C99 6.7.5.3p11: in "typedef int X; void foo(X)", X is
|
|
// considered to be a type, not a K&R identifier-list.
|
|
isGrouping = false;
|
|
} else {
|
|
// Otherwise, this is a grouping paren, e.g. 'int (*X)' or 'int(X)'.
|
|
isGrouping = true;
|
|
}
|
|
|
|
// If this is a grouping paren, handle:
|
|
// direct-declarator: '(' declarator ')'
|
|
// direct-declarator: '(' attributes declarator ')'
|
|
if (isGrouping) {
|
|
if (Tok.is(tok::kw___attribute))
|
|
D.AddAttributes(ParseAttributes());
|
|
|
|
ParseDeclaratorInternal(D);
|
|
// Match the ')'.
|
|
MatchRHSPunctuation(tok::r_paren, StartLoc);
|
|
return;
|
|
}
|
|
|
|
// Okay, if this wasn't a grouping paren, it must be the start of a function
|
|
// argument list. Recognize that this declarator will never have an
|
|
// identifier (and remember where it would have been), then fall through to
|
|
// the handling of argument lists.
|
|
D.SetIdentifier(0, Tok.getLocation());
|
|
|
|
ParseFunctionDeclarator(StartLoc, D);
|
|
}
|
|
|
|
/// ParseFunctionDeclarator - We are after the identifier and have parsed the
|
|
/// declarator D up to a paren, which indicates that we are parsing function
|
|
/// arguments.
|
|
///
|
|
/// This method also handles this portion of the grammar:
|
|
/// parameter-type-list: [C99 6.7.5]
|
|
/// parameter-list
|
|
/// parameter-list ',' '...'
|
|
///
|
|
/// parameter-list: [C99 6.7.5]
|
|
/// parameter-declaration
|
|
/// parameter-list ',' parameter-declaration
|
|
///
|
|
/// parameter-declaration: [C99 6.7.5]
|
|
/// declaration-specifiers declarator
|
|
/// [C++] declaration-specifiers declarator '=' assignment-expression
|
|
/// [GNU] declaration-specifiers declarator attributes
|
|
/// declaration-specifiers abstract-declarator[opt]
|
|
/// [C++] declaration-specifiers abstract-declarator[opt]
|
|
/// '=' assignment-expression
|
|
/// [GNU] declaration-specifiers abstract-declarator[opt] attributes
|
|
///
|
|
void Parser::ParseFunctionDeclarator(SourceLocation LParenLoc, Declarator &D) {
|
|
// lparen is already consumed!
|
|
assert(D.isPastIdentifier() && "Should not call before identifier!");
|
|
|
|
// Okay, this is the parameter list of a function definition, or it is an
|
|
// identifier list of a K&R-style function.
|
|
|
|
if (Tok.is(tok::r_paren)) {
|
|
// Remember that we parsed a function type, and remember the attributes.
|
|
// int() -> no prototype, no '...'.
|
|
D.AddTypeInfo(DeclaratorChunk::getFunction(/*prototype*/ false,
|
|
/*variadic*/ false,
|
|
/*arglist*/ 0, 0, LParenLoc));
|
|
|
|
ConsumeParen(); // Eat the closing ')'.
|
|
return;
|
|
} else if (Tok.is(tok::identifier) &&
|
|
// K&R identifier lists can't have typedefs as identifiers, per
|
|
// C99 6.7.5.3p11.
|
|
!Actions.isTypeName(*Tok.getIdentifierInfo(), CurScope)) {
|
|
// Identifier list. Note that '(' identifier-list ')' is only allowed for
|
|
// normal declarators, not for abstract-declarators.
|
|
return ParseFunctionDeclaratorIdentifierList(LParenLoc, D);
|
|
}
|
|
|
|
// Finally, a normal, non-empty parameter type list.
|
|
|
|
// Build up an array of information about the parsed arguments.
|
|
llvm::SmallVector<DeclaratorChunk::ParamInfo, 16> ParamInfo;
|
|
|
|
// Enter function-declaration scope, limiting any declarators to the
|
|
// function prototype scope, including parameter declarators.
|
|
EnterScope(Scope::DeclScope);
|
|
|
|
bool IsVariadic = false;
|
|
while (1) {
|
|
if (Tok.is(tok::ellipsis)) {
|
|
IsVariadic = true;
|
|
|
|
// Check to see if this is "void(...)" which is not allowed.
|
|
if (ParamInfo.empty()) {
|
|
// Otherwise, parse parameter type list. If it starts with an
|
|
// ellipsis, diagnose the malformed function.
|
|
Diag(Tok, diag::err_ellipsis_first_arg);
|
|
IsVariadic = false; // Treat this like 'void()'.
|
|
}
|
|
|
|
ConsumeToken(); // Consume the ellipsis.
|
|
break;
|
|
}
|
|
|
|
SourceLocation DSStart = Tok.getLocation();
|
|
|
|
// Parse the declaration-specifiers.
|
|
DeclSpec DS;
|
|
ParseDeclarationSpecifiers(DS);
|
|
|
|
// Parse the declarator. This is "PrototypeContext", because we must
|
|
// accept either 'declarator' or 'abstract-declarator' here.
|
|
Declarator ParmDecl(DS, Declarator::PrototypeContext);
|
|
ParseDeclarator(ParmDecl);
|
|
|
|
// Parse GNU attributes, if present.
|
|
if (Tok.is(tok::kw___attribute))
|
|
ParmDecl.AddAttributes(ParseAttributes());
|
|
|
|
// Remember this parsed parameter in ParamInfo.
|
|
IdentifierInfo *ParmII = ParmDecl.getIdentifier();
|
|
|
|
// If no parameter was specified, verify that *something* was specified,
|
|
// otherwise we have a missing type and identifier.
|
|
if (DS.getParsedSpecifiers() == DeclSpec::PQ_None &&
|
|
ParmDecl.getIdentifier() == 0 && ParmDecl.getNumTypeObjects() == 0) {
|
|
// Completely missing, emit error.
|
|
Diag(DSStart, diag::err_missing_param);
|
|
} else {
|
|
// Otherwise, we have something. Add it and let semantic analysis try
|
|
// to grok it and add the result to the ParamInfo we are building.
|
|
|
|
// Inform the actions module about the parameter declarator, so it gets
|
|
// added to the current scope.
|
|
DeclTy *Param = Actions.ActOnParamDeclarator(CurScope, ParmDecl);
|
|
|
|
// Parse the default argument, if any. We parse the default
|
|
// arguments in all dialects; the semantic analysis in
|
|
// ActOnParamDefaultArgument will reject the default argument in
|
|
// C.
|
|
if (Tok.is(tok::equal)) {
|
|
SourceLocation EqualLoc = Tok.getLocation();
|
|
|
|
// Consume the '='.
|
|
ConsumeToken();
|
|
|
|
// Parse the default argument
|
|
ExprResult DefArgResult = ParseAssignmentExpression();
|
|
if (DefArgResult.isInvalid) {
|
|
SkipUntil(tok::comma, tok::r_paren, true, true);
|
|
} else {
|
|
// Inform the actions module about the default argument
|
|
Actions.ActOnParamDefaultArgument(Param, EqualLoc, DefArgResult.Val);
|
|
}
|
|
}
|
|
|
|
ParamInfo.push_back(DeclaratorChunk::ParamInfo(ParmII,
|
|
ParmDecl.getIdentifierLoc(), Param));
|
|
}
|
|
|
|
// If the next token is a comma, consume it and keep reading arguments.
|
|
if (Tok.isNot(tok::comma)) break;
|
|
|
|
// Consume the comma.
|
|
ConsumeToken();
|
|
}
|
|
|
|
// Leave prototype scope.
|
|
ExitScope();
|
|
|
|
// Remember that we parsed a function type, and remember the attributes.
|
|
D.AddTypeInfo(DeclaratorChunk::getFunction(/*proto*/true, IsVariadic,
|
|
&ParamInfo[0], ParamInfo.size(),
|
|
LParenLoc));
|
|
|
|
// If we have the closing ')', eat it and we're done.
|
|
MatchRHSPunctuation(tok::r_paren, LParenLoc);
|
|
}
|
|
|
|
/// ParseFunctionDeclaratorIdentifierList - While parsing a function declarator
|
|
/// we found a K&R-style identifier list instead of a type argument list. The
|
|
/// current token is known to be the first identifier in the list.
|
|
///
|
|
/// identifier-list: [C99 6.7.5]
|
|
/// identifier
|
|
/// identifier-list ',' identifier
|
|
///
|
|
void Parser::ParseFunctionDeclaratorIdentifierList(SourceLocation LParenLoc,
|
|
Declarator &D) {
|
|
// Build up an array of information about the parsed arguments.
|
|
llvm::SmallVector<DeclaratorChunk::ParamInfo, 16> ParamInfo;
|
|
llvm::SmallSet<const IdentifierInfo*, 16> ParamsSoFar;
|
|
|
|
// If there was no identifier specified for the declarator, either we are in
|
|
// an abstract-declarator, or we are in a parameter declarator which was found
|
|
// to be abstract. In abstract-declarators, identifier lists are not valid:
|
|
// diagnose this.
|
|
if (!D.getIdentifier())
|
|
Diag(Tok, diag::ext_ident_list_in_param);
|
|
|
|
// Tok is known to be the first identifier in the list. Remember this
|
|
// identifier in ParamInfo.
|
|
ParamsSoFar.insert(Tok.getIdentifierInfo());
|
|
ParamInfo.push_back(DeclaratorChunk::ParamInfo(Tok.getIdentifierInfo(),
|
|
Tok.getLocation(), 0));
|
|
|
|
ConsumeToken(); // eat the first identifier.
|
|
|
|
while (Tok.is(tok::comma)) {
|
|
// Eat the comma.
|
|
ConsumeToken();
|
|
|
|
// If this isn't an identifier, report the error and skip until ')'.
|
|
if (Tok.isNot(tok::identifier)) {
|
|
Diag(Tok, diag::err_expected_ident);
|
|
SkipUntil(tok::r_paren);
|
|
return;
|
|
}
|
|
|
|
IdentifierInfo *ParmII = Tok.getIdentifierInfo();
|
|
|
|
// Reject 'typedef int y; int test(x, y)', but continue parsing.
|
|
if (Actions.isTypeName(*ParmII, CurScope))
|
|
Diag(Tok, diag::err_unexpected_typedef_ident, ParmII->getName());
|
|
|
|
// Verify that the argument identifier has not already been mentioned.
|
|
if (!ParamsSoFar.insert(ParmII)) {
|
|
Diag(Tok.getLocation(), diag::err_param_redefinition, ParmII->getName());
|
|
} else {
|
|
// Remember this identifier in ParamInfo.
|
|
ParamInfo.push_back(DeclaratorChunk::ParamInfo(ParmII,
|
|
Tok.getLocation(), 0));
|
|
}
|
|
|
|
// Eat the identifier.
|
|
ConsumeToken();
|
|
}
|
|
|
|
// Remember that we parsed a function type, and remember the attributes. This
|
|
// function type is always a K&R style function type, which is not varargs and
|
|
// has no prototype.
|
|
D.AddTypeInfo(DeclaratorChunk::getFunction(/*proto*/false, /*varargs*/false,
|
|
&ParamInfo[0], ParamInfo.size(),
|
|
LParenLoc));
|
|
|
|
// If we have the closing ')', eat it and we're done.
|
|
MatchRHSPunctuation(tok::r_paren, LParenLoc);
|
|
}
|
|
|
|
/// [C90] direct-declarator '[' constant-expression[opt] ']'
|
|
/// [C99] direct-declarator '[' type-qual-list[opt] assignment-expr[opt] ']'
|
|
/// [C99] direct-declarator '[' 'static' type-qual-list[opt] assign-expr ']'
|
|
/// [C99] direct-declarator '[' type-qual-list 'static' assignment-expr ']'
|
|
/// [C99] direct-declarator '[' type-qual-list[opt] '*' ']'
|
|
void Parser::ParseBracketDeclarator(Declarator &D) {
|
|
SourceLocation StartLoc = ConsumeBracket();
|
|
|
|
// If valid, this location is the position where we read the 'static' keyword.
|
|
SourceLocation StaticLoc;
|
|
if (Tok.is(tok::kw_static))
|
|
StaticLoc = ConsumeToken();
|
|
|
|
// If there is a type-qualifier-list, read it now.
|
|
DeclSpec DS;
|
|
ParseTypeQualifierListOpt(DS);
|
|
|
|
// If we haven't already read 'static', check to see if there is one after the
|
|
// type-qualifier-list.
|
|
if (!StaticLoc.isValid() && Tok.is(tok::kw_static))
|
|
StaticLoc = ConsumeToken();
|
|
|
|
// Handle "direct-declarator [ type-qual-list[opt] * ]".
|
|
bool isStar = false;
|
|
ExprResult NumElements(false);
|
|
|
|
// Handle the case where we have '[*]' as the array size. However, a leading
|
|
// star could be the start of an expression, for example 'X[*p + 4]'. Verify
|
|
// the the token after the star is a ']'. Since stars in arrays are
|
|
// infrequent, use of lookahead is not costly here.
|
|
if (Tok.is(tok::star) && GetLookAheadToken(1).is(tok::r_square)) {
|
|
ConsumeToken(); // Eat the '*'.
|
|
|
|
if (StaticLoc.isValid())
|
|
Diag(StaticLoc, diag::err_unspecified_vla_size_with_static);
|
|
StaticLoc = SourceLocation(); // Drop the static.
|
|
isStar = true;
|
|
} else if (Tok.isNot(tok::r_square)) {
|
|
// Parse the assignment-expression now.
|
|
NumElements = ParseAssignmentExpression();
|
|
}
|
|
|
|
// If there was an error parsing the assignment-expression, recover.
|
|
if (NumElements.isInvalid) {
|
|
// If the expression was invalid, skip it.
|
|
SkipUntil(tok::r_square);
|
|
return;
|
|
}
|
|
|
|
MatchRHSPunctuation(tok::r_square, StartLoc);
|
|
|
|
// If C99 isn't enabled, emit an ext-warn if the arg list wasn't empty and if
|
|
// it was not a constant expression.
|
|
if (!getLang().C99) {
|
|
// TODO: check C90 array constant exprness.
|
|
if (isStar || StaticLoc.isValid() ||
|
|
0/*TODO: NumElts is not a C90 constantexpr */)
|
|
Diag(StartLoc, diag::ext_c99_array_usage);
|
|
}
|
|
|
|
// Remember that we parsed a pointer type, and remember the type-quals.
|
|
D.AddTypeInfo(DeclaratorChunk::getArray(DS.getTypeQualifiers(),
|
|
StaticLoc.isValid(), isStar,
|
|
NumElements.Val, StartLoc));
|
|
}
|
|
|
|
/// [GNU] typeof-specifier:
|
|
/// typeof ( expressions )
|
|
/// typeof ( type-name )
|
|
///
|
|
void Parser::ParseTypeofSpecifier(DeclSpec &DS) {
|
|
assert(Tok.is(tok::kw_typeof) && "Not a typeof specifier");
|
|
const IdentifierInfo *BuiltinII = Tok.getIdentifierInfo();
|
|
SourceLocation StartLoc = ConsumeToken();
|
|
|
|
if (Tok.isNot(tok::l_paren)) {
|
|
Diag(Tok, diag::err_expected_lparen_after, BuiltinII->getName());
|
|
return;
|
|
}
|
|
SourceLocation LParenLoc = ConsumeParen(), RParenLoc;
|
|
|
|
if (isTypeSpecifierQualifier()) {
|
|
TypeTy *Ty = ParseTypeName();
|
|
|
|
assert(Ty && "Parser::ParseTypeofSpecifier(): missing type");
|
|
|
|
if (Tok.isNot(tok::r_paren)) {
|
|
MatchRHSPunctuation(tok::r_paren, LParenLoc);
|
|
return;
|
|
}
|
|
RParenLoc = ConsumeParen();
|
|
const char *PrevSpec = 0;
|
|
// Check for duplicate type specifiers (e.g. "int typeof(int)").
|
|
if (DS.SetTypeSpecType(DeclSpec::TST_typeofType, StartLoc, PrevSpec, Ty))
|
|
Diag(StartLoc, diag::err_invalid_decl_spec_combination, PrevSpec);
|
|
} else { // we have an expression.
|
|
ExprResult Result = ParseExpression();
|
|
|
|
if (Result.isInvalid || Tok.isNot(tok::r_paren)) {
|
|
MatchRHSPunctuation(tok::r_paren, LParenLoc);
|
|
return;
|
|
}
|
|
RParenLoc = ConsumeParen();
|
|
const char *PrevSpec = 0;
|
|
// Check for duplicate type specifiers (e.g. "int typeof(int)").
|
|
if (DS.SetTypeSpecType(DeclSpec::TST_typeofExpr, StartLoc, PrevSpec,
|
|
Result.Val))
|
|
Diag(StartLoc, diag::err_invalid_decl_spec_combination, PrevSpec);
|
|
}
|
|
}
|
|
|