Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1 | //===--- ParseExprCXX.cpp - C++ Expression Parsing ------------------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
Chris Lattner | 0bc735f | 2007-12-29 19:59:25 +0000 | [diff] [blame] | 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This file implements the Expression parsing implementation for C++. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "clang/Basic/Diagnostic.h" |
| 15 | #include "clang/Parse/Parser.h" |
Argyrios Kyrtzidis | 987a14b | 2008-08-22 15:38:55 +0000 | [diff] [blame] | 16 | #include "clang/Parse/DeclSpec.h" |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 17 | using namespace clang; |
| 18 | |
| 19 | /// ParseCXXCasts - This handles the various ways to cast expressions to another |
| 20 | /// type. |
| 21 | /// |
| 22 | /// postfix-expression: [C++ 5.2p1] |
| 23 | /// 'dynamic_cast' '<' type-name '>' '(' expression ')' |
| 24 | /// 'static_cast' '<' type-name '>' '(' expression ')' |
| 25 | /// 'reinterpret_cast' '<' type-name '>' '(' expression ')' |
| 26 | /// 'const_cast' '<' type-name '>' '(' expression ')' |
| 27 | /// |
| 28 | Parser::ExprResult Parser::ParseCXXCasts() { |
| 29 | tok::TokenKind Kind = Tok.getKind(); |
| 30 | const char *CastName = 0; // For error messages |
| 31 | |
| 32 | switch (Kind) { |
| 33 | default: assert(0 && "Unknown C++ cast!"); abort(); |
| 34 | case tok::kw_const_cast: CastName = "const_cast"; break; |
| 35 | case tok::kw_dynamic_cast: CastName = "dynamic_cast"; break; |
| 36 | case tok::kw_reinterpret_cast: CastName = "reinterpret_cast"; break; |
| 37 | case tok::kw_static_cast: CastName = "static_cast"; break; |
| 38 | } |
| 39 | |
| 40 | SourceLocation OpLoc = ConsumeToken(); |
| 41 | SourceLocation LAngleBracketLoc = Tok.getLocation(); |
| 42 | |
| 43 | if (ExpectAndConsume(tok::less, diag::err_expected_less_after, CastName)) |
| 44 | return ExprResult(true); |
| 45 | |
| 46 | TypeTy *CastTy = ParseTypeName(); |
| 47 | SourceLocation RAngleBracketLoc = Tok.getLocation(); |
| 48 | |
| 49 | if (ExpectAndConsume(tok::greater, diag::err_expected_greater)) { |
| 50 | Diag(LAngleBracketLoc, diag::err_matching, "<"); |
| 51 | return ExprResult(true); |
| 52 | } |
| 53 | |
| 54 | SourceLocation LParenLoc = Tok.getLocation(), RParenLoc; |
| 55 | |
Chris Lattner | 4e1d99a | 2007-10-09 17:41:39 +0000 | [diff] [blame] | 56 | if (Tok.isNot(tok::l_paren)) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 57 | Diag(Tok, diag::err_expected_lparen_after, CastName); |
| 58 | return ExprResult(true); |
| 59 | } |
| 60 | |
| 61 | ExprResult Result = ParseSimpleParenExpression(RParenLoc); |
| 62 | |
| 63 | if (!Result.isInvalid) |
Douglas Gregor | 49badde | 2008-10-27 19:41:14 +0000 | [diff] [blame] | 64 | Result = Actions.ActOnCXXNamedCast(OpLoc, Kind, |
| 65 | LAngleBracketLoc, CastTy, RAngleBracketLoc, |
| 66 | LParenLoc, Result.Val, RParenLoc); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 67 | |
| 68 | return Result; |
| 69 | } |
| 70 | |
| 71 | /// ParseCXXBoolLiteral - This handles the C++ Boolean literals. |
| 72 | /// |
| 73 | /// boolean-literal: [C++ 2.13.5] |
| 74 | /// 'true' |
| 75 | /// 'false' |
| 76 | Parser::ExprResult Parser::ParseCXXBoolLiteral() { |
| 77 | tok::TokenKind Kind = Tok.getKind(); |
Steve Naroff | 1b273c4 | 2007-09-16 14:56:35 +0000 | [diff] [blame] | 78 | return Actions.ActOnCXXBoolLiteral(ConsumeToken(), Kind); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 79 | } |
Chris Lattner | 50dd289 | 2008-02-26 00:51:44 +0000 | [diff] [blame] | 80 | |
| 81 | /// ParseThrowExpression - This handles the C++ throw expression. |
| 82 | /// |
| 83 | /// throw-expression: [C++ 15] |
| 84 | /// 'throw' assignment-expression[opt] |
| 85 | Parser::ExprResult Parser::ParseThrowExpression() { |
| 86 | assert(Tok.is(tok::kw_throw) && "Not throw!"); |
Chris Lattner | 50dd289 | 2008-02-26 00:51:44 +0000 | [diff] [blame] | 87 | SourceLocation ThrowLoc = ConsumeToken(); // Eat the throw token. |
Chris Lattner | 3e3d310 | 2008-04-06 06:03:03 +0000 | [diff] [blame] | 88 | |
Chris Lattner | 2a2819a | 2008-04-06 06:02:23 +0000 | [diff] [blame] | 89 | // If the current token isn't the start of an assignment-expression, |
| 90 | // then the expression is not present. This handles things like: |
| 91 | // "C ? throw : (void)42", which is crazy but legal. |
| 92 | switch (Tok.getKind()) { // FIXME: move this predicate somewhere common. |
| 93 | case tok::semi: |
| 94 | case tok::r_paren: |
| 95 | case tok::r_square: |
| 96 | case tok::r_brace: |
| 97 | case tok::colon: |
| 98 | case tok::comma: |
Chris Lattner | 50dd289 | 2008-02-26 00:51:44 +0000 | [diff] [blame] | 99 | return Actions.ActOnCXXThrow(ThrowLoc); |
| 100 | |
Chris Lattner | 2a2819a | 2008-04-06 06:02:23 +0000 | [diff] [blame] | 101 | default: |
Chris Lattner | 3e3d310 | 2008-04-06 06:03:03 +0000 | [diff] [blame] | 102 | ExprResult Expr = ParseAssignmentExpression(); |
Chris Lattner | 2a2819a | 2008-04-06 06:02:23 +0000 | [diff] [blame] | 103 | if (Expr.isInvalid) return Expr; |
| 104 | return Actions.ActOnCXXThrow(ThrowLoc, Expr.Val); |
| 105 | } |
Chris Lattner | 50dd289 | 2008-02-26 00:51:44 +0000 | [diff] [blame] | 106 | } |
Argyrios Kyrtzidis | 4cc18a4 | 2008-06-24 22:12:16 +0000 | [diff] [blame] | 107 | |
| 108 | /// ParseCXXThis - This handles the C++ 'this' pointer. |
| 109 | /// |
| 110 | /// C++ 9.3.2: In the body of a non-static member function, the keyword this is |
| 111 | /// a non-lvalue expression whose value is the address of the object for which |
| 112 | /// the function is called. |
| 113 | Parser::ExprResult Parser::ParseCXXThis() { |
| 114 | assert(Tok.is(tok::kw_this) && "Not 'this'!"); |
| 115 | SourceLocation ThisLoc = ConsumeToken(); |
Argyrios Kyrtzidis | 289d773 | 2008-08-16 19:34:46 +0000 | [diff] [blame] | 116 | return Actions.ActOnCXXThis(ThisLoc); |
Argyrios Kyrtzidis | 4cc18a4 | 2008-06-24 22:12:16 +0000 | [diff] [blame] | 117 | } |
Argyrios Kyrtzidis | 987a14b | 2008-08-22 15:38:55 +0000 | [diff] [blame] | 118 | |
| 119 | /// ParseCXXTypeConstructExpression - Parse construction of a specified type. |
| 120 | /// Can be interpreted either as function-style casting ("int(x)") |
| 121 | /// or class type construction ("ClassType(x,y,z)") |
| 122 | /// or creation of a value-initialized type ("int()"). |
| 123 | /// |
| 124 | /// postfix-expression: [C++ 5.2p1] |
| 125 | /// simple-type-specifier '(' expression-list[opt] ')' [C++ 5.2.3] |
| 126 | /// typename-specifier '(' expression-list[opt] ')' [TODO] |
| 127 | /// |
| 128 | Parser::ExprResult Parser::ParseCXXTypeConstructExpression(const DeclSpec &DS) { |
| 129 | Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); |
| 130 | TypeTy *TypeRep = Actions.ActOnTypeName(CurScope, DeclaratorInfo).Val; |
| 131 | |
| 132 | assert(Tok.is(tok::l_paren) && "Expected '('!"); |
| 133 | SourceLocation LParenLoc = ConsumeParen(); |
| 134 | |
| 135 | ExprListTy Exprs; |
| 136 | CommaLocsTy CommaLocs; |
| 137 | |
| 138 | if (Tok.isNot(tok::r_paren)) { |
| 139 | if (ParseExpressionList(Exprs, CommaLocs)) { |
| 140 | SkipUntil(tok::r_paren); |
| 141 | return ExprResult(true); |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | // Match the ')'. |
| 146 | SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); |
| 147 | |
| 148 | assert((Exprs.size() == 0 || Exprs.size()-1 == CommaLocs.size())&& |
| 149 | "Unexpected number of commas!"); |
| 150 | return Actions.ActOnCXXTypeConstructExpr(DS.getSourceRange(), TypeRep, |
| 151 | LParenLoc, |
| 152 | &Exprs[0], Exprs.size(), |
| 153 | &CommaLocs[0], RParenLoc); |
| 154 | } |
| 155 | |
Argyrios Kyrtzidis | 71b914b | 2008-09-09 20:38:47 +0000 | [diff] [blame] | 156 | /// ParseCXXCondition - if/switch/while/for condition expression. |
| 157 | /// |
| 158 | /// condition: |
| 159 | /// expression |
| 160 | /// type-specifier-seq declarator '=' assignment-expression |
| 161 | /// [GNU] type-specifier-seq declarator simple-asm-expr[opt] attributes[opt] |
| 162 | /// '=' assignment-expression |
| 163 | /// |
| 164 | Parser::ExprResult Parser::ParseCXXCondition() { |
Argyrios Kyrtzidis | a8a4598 | 2008-10-05 15:03:47 +0000 | [diff] [blame] | 165 | if (!isCXXConditionDeclaration()) |
Argyrios Kyrtzidis | 71b914b | 2008-09-09 20:38:47 +0000 | [diff] [blame] | 166 | return ParseExpression(); // expression |
| 167 | |
| 168 | SourceLocation StartLoc = Tok.getLocation(); |
| 169 | |
| 170 | // type-specifier-seq |
| 171 | DeclSpec DS; |
| 172 | ParseSpecifierQualifierList(DS); |
| 173 | |
| 174 | // declarator |
| 175 | Declarator DeclaratorInfo(DS, Declarator::ConditionContext); |
| 176 | ParseDeclarator(DeclaratorInfo); |
| 177 | |
| 178 | // simple-asm-expr[opt] |
| 179 | if (Tok.is(tok::kw_asm)) { |
| 180 | ExprResult AsmLabel = ParseSimpleAsm(); |
| 181 | if (AsmLabel.isInvalid) { |
| 182 | SkipUntil(tok::semi); |
| 183 | return true; |
| 184 | } |
| 185 | DeclaratorInfo.setAsmLabel(AsmLabel.Val); |
| 186 | } |
| 187 | |
| 188 | // If attributes are present, parse them. |
| 189 | if (Tok.is(tok::kw___attribute)) |
| 190 | DeclaratorInfo.AddAttributes(ParseAttributes()); |
| 191 | |
| 192 | // '=' assignment-expression |
| 193 | if (Tok.isNot(tok::equal)) |
| 194 | return Diag(Tok, diag::err_expected_equal_after_declarator); |
| 195 | SourceLocation EqualLoc = ConsumeToken(); |
| 196 | ExprResult AssignExpr = ParseAssignmentExpression(); |
| 197 | if (AssignExpr.isInvalid) |
| 198 | return true; |
| 199 | |
| 200 | return Actions.ActOnCXXConditionDeclarationExpr(CurScope, StartLoc, |
| 201 | DeclaratorInfo, |
| 202 | EqualLoc, AssignExpr.Val); |
| 203 | } |
| 204 | |
Argyrios Kyrtzidis | 987a14b | 2008-08-22 15:38:55 +0000 | [diff] [blame] | 205 | /// ParseCXXSimpleTypeSpecifier - [C++ 7.1.5.2] Simple type specifiers. |
| 206 | /// This should only be called when the current token is known to be part of |
| 207 | /// simple-type-specifier. |
| 208 | /// |
| 209 | /// simple-type-specifier: |
| 210 | /// '::'[opt] nested-name-specifier[opt] type-name [TODO] |
| 211 | /// '::'[opt] nested-name-specifier 'template' simple-template-id [TODO] |
| 212 | /// char |
| 213 | /// wchar_t |
| 214 | /// bool |
| 215 | /// short |
| 216 | /// int |
| 217 | /// long |
| 218 | /// signed |
| 219 | /// unsigned |
| 220 | /// float |
| 221 | /// double |
| 222 | /// void |
| 223 | /// [GNU] typeof-specifier |
| 224 | /// [C++0x] auto [TODO] |
| 225 | /// |
| 226 | /// type-name: |
| 227 | /// class-name |
| 228 | /// enum-name |
| 229 | /// typedef-name |
| 230 | /// |
| 231 | void Parser::ParseCXXSimpleTypeSpecifier(DeclSpec &DS) { |
| 232 | DS.SetRangeStart(Tok.getLocation()); |
| 233 | const char *PrevSpec; |
| 234 | SourceLocation Loc = Tok.getLocation(); |
| 235 | |
| 236 | switch (Tok.getKind()) { |
| 237 | default: |
| 238 | assert(0 && "Not a simple-type-specifier token!"); |
| 239 | abort(); |
| 240 | |
| 241 | // type-name |
| 242 | case tok::identifier: { |
| 243 | TypeTy *TypeRep = Actions.isTypeName(*Tok.getIdentifierInfo(), CurScope); |
| 244 | assert(TypeRep && "Identifier wasn't a type-name!"); |
| 245 | DS.SetTypeSpecType(DeclSpec::TST_typedef, Loc, PrevSpec, TypeRep); |
| 246 | break; |
| 247 | } |
| 248 | |
| 249 | // builtin types |
| 250 | case tok::kw_short: |
| 251 | DS.SetTypeSpecWidth(DeclSpec::TSW_short, Loc, PrevSpec); |
| 252 | break; |
| 253 | case tok::kw_long: |
| 254 | DS.SetTypeSpecWidth(DeclSpec::TSW_long, Loc, PrevSpec); |
| 255 | break; |
| 256 | case tok::kw_signed: |
| 257 | DS.SetTypeSpecSign(DeclSpec::TSS_signed, Loc, PrevSpec); |
| 258 | break; |
| 259 | case tok::kw_unsigned: |
| 260 | DS.SetTypeSpecSign(DeclSpec::TSS_unsigned, Loc, PrevSpec); |
| 261 | break; |
| 262 | case tok::kw_void: |
| 263 | DS.SetTypeSpecType(DeclSpec::TST_void, Loc, PrevSpec); |
| 264 | break; |
| 265 | case tok::kw_char: |
| 266 | DS.SetTypeSpecType(DeclSpec::TST_char, Loc, PrevSpec); |
| 267 | break; |
| 268 | case tok::kw_int: |
| 269 | DS.SetTypeSpecType(DeclSpec::TST_int, Loc, PrevSpec); |
| 270 | break; |
| 271 | case tok::kw_float: |
| 272 | DS.SetTypeSpecType(DeclSpec::TST_float, Loc, PrevSpec); |
| 273 | break; |
| 274 | case tok::kw_double: |
| 275 | DS.SetTypeSpecType(DeclSpec::TST_double, Loc, PrevSpec); |
| 276 | break; |
| 277 | case tok::kw_wchar_t: |
| 278 | DS.SetTypeSpecType(DeclSpec::TST_wchar, Loc, PrevSpec); |
| 279 | break; |
| 280 | case tok::kw_bool: |
| 281 | DS.SetTypeSpecType(DeclSpec::TST_bool, Loc, PrevSpec); |
| 282 | break; |
| 283 | |
| 284 | // GNU typeof support. |
| 285 | case tok::kw_typeof: |
| 286 | ParseTypeofSpecifier(DS); |
| 287 | DS.Finish(Diags, PP.getSourceManager(), getLang()); |
| 288 | return; |
| 289 | } |
| 290 | DS.SetRangeEnd(Tok.getLocation()); |
| 291 | ConsumeToken(); |
| 292 | DS.Finish(Diags, PP.getSourceManager(), getLang()); |
| 293 | } |