Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1 | //===--- Expr.cpp - Expression AST Node Implementation --------------------===// |
| 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 Expr class and subclasses. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "clang/AST/Expr.h" |
Chris Lattner | 2eadfb6 | 2007-07-15 23:32:58 +0000 | [diff] [blame] | 15 | #include "clang/AST/ASTContext.h" |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 16 | #include "clang/AST/StmtVisitor.h" |
Chris Lattner | c7229c3 | 2007-10-07 08:58:51 +0000 | [diff] [blame] | 17 | #include "clang/Basic/IdentifierTable.h" |
Chris Lattner | da5a6b6 | 2007-11-27 18:22:04 +0000 | [diff] [blame] | 18 | #include "clang/Basic/TargetInfo.h" |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 19 | using namespace clang; |
| 20 | |
| 21 | //===----------------------------------------------------------------------===// |
| 22 | // Primary Expressions. |
| 23 | //===----------------------------------------------------------------------===// |
| 24 | |
| 25 | StringLiteral::StringLiteral(const char *strData, unsigned byteLength, |
| 26 | bool Wide, QualType t, SourceLocation firstLoc, |
| 27 | SourceLocation lastLoc) : |
| 28 | Expr(StringLiteralClass, t) { |
| 29 | // OPTIMIZE: could allocate this appended to the StringLiteral. |
| 30 | char *AStrData = new char[byteLength]; |
| 31 | memcpy(AStrData, strData, byteLength); |
| 32 | StrData = AStrData; |
| 33 | ByteLength = byteLength; |
| 34 | IsWide = Wide; |
| 35 | firstTokLoc = firstLoc; |
| 36 | lastTokLoc = lastLoc; |
| 37 | } |
| 38 | |
| 39 | StringLiteral::~StringLiteral() { |
| 40 | delete[] StrData; |
| 41 | } |
| 42 | |
| 43 | bool UnaryOperator::isPostfix(Opcode Op) { |
| 44 | switch (Op) { |
| 45 | case PostInc: |
| 46 | case PostDec: |
| 47 | return true; |
| 48 | default: |
| 49 | return false; |
| 50 | } |
| 51 | } |
| 52 | |
| 53 | /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it |
| 54 | /// corresponds to, e.g. "sizeof" or "[pre]++". |
| 55 | const char *UnaryOperator::getOpcodeStr(Opcode Op) { |
| 56 | switch (Op) { |
| 57 | default: assert(0 && "Unknown unary operator"); |
| 58 | case PostInc: return "++"; |
| 59 | case PostDec: return "--"; |
| 60 | case PreInc: return "++"; |
| 61 | case PreDec: return "--"; |
| 62 | case AddrOf: return "&"; |
| 63 | case Deref: return "*"; |
| 64 | case Plus: return "+"; |
| 65 | case Minus: return "-"; |
| 66 | case Not: return "~"; |
| 67 | case LNot: return "!"; |
| 68 | case Real: return "__real"; |
| 69 | case Imag: return "__imag"; |
| 70 | case SizeOf: return "sizeof"; |
| 71 | case AlignOf: return "alignof"; |
| 72 | case Extension: return "__extension__"; |
Chris Lattner | 73d0d4f | 2007-08-30 17:45:32 +0000 | [diff] [blame] | 73 | case OffsetOf: return "__builtin_offsetof"; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 74 | } |
| 75 | } |
| 76 | |
| 77 | //===----------------------------------------------------------------------===// |
| 78 | // Postfix Operators. |
| 79 | //===----------------------------------------------------------------------===// |
| 80 | |
Nate Begeman | e2ce1d9 | 2008-01-17 17:46:27 +0000 | [diff] [blame] | 81 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 82 | CallExpr::CallExpr(Expr *fn, Expr **args, unsigned numargs, QualType t, |
| 83 | SourceLocation rparenloc) |
Ted Kremenek | 77ed8e4 | 2007-08-24 18:13:47 +0000 | [diff] [blame] | 84 | : Expr(CallExprClass, t), NumArgs(numargs) { |
| 85 | SubExprs = new Expr*[numargs+1]; |
| 86 | SubExprs[FN] = fn; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 87 | for (unsigned i = 0; i != numargs; ++i) |
Ted Kremenek | 77ed8e4 | 2007-08-24 18:13:47 +0000 | [diff] [blame] | 88 | SubExprs[i+ARGS_START] = args[i]; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 89 | RParenLoc = rparenloc; |
| 90 | } |
| 91 | |
Chris Lattner | d18b329 | 2007-12-28 05:25:02 +0000 | [diff] [blame] | 92 | /// setNumArgs - This changes the number of arguments present in this call. |
| 93 | /// Any orphaned expressions are deleted by this, and any new operands are set |
| 94 | /// to null. |
| 95 | void CallExpr::setNumArgs(unsigned NumArgs) { |
| 96 | // No change, just return. |
| 97 | if (NumArgs == getNumArgs()) return; |
| 98 | |
| 99 | // If shrinking # arguments, just delete the extras and forgot them. |
| 100 | if (NumArgs < getNumArgs()) { |
| 101 | for (unsigned i = NumArgs, e = getNumArgs(); i != e; ++i) |
| 102 | delete getArg(i); |
| 103 | this->NumArgs = NumArgs; |
| 104 | return; |
| 105 | } |
| 106 | |
| 107 | // Otherwise, we are growing the # arguments. New an bigger argument array. |
| 108 | Expr **NewSubExprs = new Expr*[NumArgs+1]; |
| 109 | // Copy over args. |
| 110 | for (unsigned i = 0; i != getNumArgs()+ARGS_START; ++i) |
| 111 | NewSubExprs[i] = SubExprs[i]; |
| 112 | // Null out new args. |
| 113 | for (unsigned i = getNumArgs()+ARGS_START; i != NumArgs+ARGS_START; ++i) |
| 114 | NewSubExprs[i] = 0; |
| 115 | |
| 116 | delete[] SubExprs; |
| 117 | SubExprs = NewSubExprs; |
| 118 | this->NumArgs = NumArgs; |
| 119 | } |
| 120 | |
Steve Naroff | c4f8e8b | 2008-01-31 01:07:12 +0000 | [diff] [blame] | 121 | bool CallExpr::isBuiltinConstantExpr() const { |
| 122 | // All simple function calls (e.g. func()) are implicitly cast to pointer to |
| 123 | // function. As a result, we try and obtain the DeclRefExpr from the |
| 124 | // ImplicitCastExpr. |
| 125 | const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); |
| 126 | if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). |
| 127 | return false; |
| 128 | |
| 129 | const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); |
| 130 | if (!DRE) |
| 131 | return false; |
| 132 | |
Anders Carlsson | bcba201 | 2008-01-31 02:13:57 +0000 | [diff] [blame] | 133 | const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); |
| 134 | if (!FDecl) |
| 135 | return false; |
| 136 | |
| 137 | unsigned builtinID = FDecl->getIdentifier()->getBuiltinID(); |
| 138 | if (!builtinID) |
| 139 | return false; |
| 140 | |
| 141 | // We have a builtin that is a constant expression |
Eli Friedman | 861dc46 | 2008-05-16 13:28:37 +0000 | [diff] [blame] | 142 | return builtinID == Builtin::BI__builtin___CFStringMakeConstantString || |
| 143 | builtinID == Builtin::BI__builtin_classify_type; |
Steve Naroff | c4f8e8b | 2008-01-31 01:07:12 +0000 | [diff] [blame] | 144 | } |
Chris Lattner | d18b329 | 2007-12-28 05:25:02 +0000 | [diff] [blame] | 145 | |
Steve Naroff | 13b7c5f | 2007-08-08 22:15:55 +0000 | [diff] [blame] | 146 | bool CallExpr::isBuiltinClassifyType(llvm::APSInt &Result) const { |
| 147 | // The following enum mimics gcc's internal "typeclass.h" file. |
| 148 | enum gcc_type_class { |
| 149 | no_type_class = -1, |
| 150 | void_type_class, integer_type_class, char_type_class, |
| 151 | enumeral_type_class, boolean_type_class, |
| 152 | pointer_type_class, reference_type_class, offset_type_class, |
| 153 | real_type_class, complex_type_class, |
| 154 | function_type_class, method_type_class, |
| 155 | record_type_class, union_type_class, |
| 156 | array_type_class, string_type_class, |
| 157 | lang_type_class |
| 158 | }; |
| 159 | Result.setIsSigned(true); |
| 160 | |
| 161 | // All simple function calls (e.g. func()) are implicitly cast to pointer to |
| 162 | // function. As a result, we try and obtain the DeclRefExpr from the |
| 163 | // ImplicitCastExpr. |
| 164 | const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); |
| 165 | if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). |
| 166 | return false; |
| 167 | const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); |
| 168 | if (!DRE) |
| 169 | return false; |
| 170 | |
| 171 | // We have a DeclRefExpr. |
| 172 | if (strcmp(DRE->getDecl()->getName(), "__builtin_classify_type") == 0) { |
| 173 | // If no argument was supplied, default to "no_type_class". This isn't |
| 174 | // ideal, however it's what gcc does. |
| 175 | Result = static_cast<uint64_t>(no_type_class); |
| 176 | if (NumArgs >= 1) { |
| 177 | QualType argType = getArg(0)->getType(); |
| 178 | |
| 179 | if (argType->isVoidType()) |
| 180 | Result = void_type_class; |
| 181 | else if (argType->isEnumeralType()) |
| 182 | Result = enumeral_type_class; |
| 183 | else if (argType->isBooleanType()) |
| 184 | Result = boolean_type_class; |
| 185 | else if (argType->isCharType()) |
| 186 | Result = string_type_class; // gcc doesn't appear to use char_type_class |
| 187 | else if (argType->isIntegerType()) |
| 188 | Result = integer_type_class; |
| 189 | else if (argType->isPointerType()) |
| 190 | Result = pointer_type_class; |
| 191 | else if (argType->isReferenceType()) |
| 192 | Result = reference_type_class; |
| 193 | else if (argType->isRealType()) |
| 194 | Result = real_type_class; |
| 195 | else if (argType->isComplexType()) |
| 196 | Result = complex_type_class; |
| 197 | else if (argType->isFunctionType()) |
| 198 | Result = function_type_class; |
| 199 | else if (argType->isStructureType()) |
| 200 | Result = record_type_class; |
| 201 | else if (argType->isUnionType()) |
| 202 | Result = union_type_class; |
| 203 | else if (argType->isArrayType()) |
| 204 | Result = array_type_class; |
| 205 | else if (argType->isUnionType()) |
| 206 | Result = union_type_class; |
| 207 | else // FIXME: offset_type_class, method_type_class, & lang_type_class? |
Chris Lattner | 3ef5bc0 | 2007-11-08 17:56:40 +0000 | [diff] [blame] | 208 | assert(0 && "CallExpr::isBuiltinClassifyType(): unimplemented type"); |
Steve Naroff | 13b7c5f | 2007-08-08 22:15:55 +0000 | [diff] [blame] | 209 | } |
| 210 | return true; |
| 211 | } |
| 212 | return false; |
| 213 | } |
| 214 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 215 | /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it |
| 216 | /// corresponds to, e.g. "<<=". |
| 217 | const char *BinaryOperator::getOpcodeStr(Opcode Op) { |
| 218 | switch (Op) { |
| 219 | default: assert(0 && "Unknown binary operator"); |
| 220 | case Mul: return "*"; |
| 221 | case Div: return "/"; |
| 222 | case Rem: return "%"; |
| 223 | case Add: return "+"; |
| 224 | case Sub: return "-"; |
| 225 | case Shl: return "<<"; |
| 226 | case Shr: return ">>"; |
| 227 | case LT: return "<"; |
| 228 | case GT: return ">"; |
| 229 | case LE: return "<="; |
| 230 | case GE: return ">="; |
| 231 | case EQ: return "=="; |
| 232 | case NE: return "!="; |
| 233 | case And: return "&"; |
| 234 | case Xor: return "^"; |
| 235 | case Or: return "|"; |
| 236 | case LAnd: return "&&"; |
| 237 | case LOr: return "||"; |
| 238 | case Assign: return "="; |
| 239 | case MulAssign: return "*="; |
| 240 | case DivAssign: return "/="; |
| 241 | case RemAssign: return "%="; |
| 242 | case AddAssign: return "+="; |
| 243 | case SubAssign: return "-="; |
| 244 | case ShlAssign: return "<<="; |
| 245 | case ShrAssign: return ">>="; |
| 246 | case AndAssign: return "&="; |
| 247 | case XorAssign: return "^="; |
| 248 | case OrAssign: return "|="; |
| 249 | case Comma: return ","; |
| 250 | } |
| 251 | } |
| 252 | |
Anders Carlsson | 66b5a8a | 2007-08-31 04:56:16 +0000 | [diff] [blame] | 253 | InitListExpr::InitListExpr(SourceLocation lbraceloc, |
| 254 | Expr **initexprs, unsigned numinits, |
| 255 | SourceLocation rbraceloc) |
Steve Naroff | c5ae899 | 2008-05-01 02:04:18 +0000 | [diff] [blame] | 256 | : Expr(InitListExprClass, QualType()), |
| 257 | LBraceLoc(lbraceloc), RBraceLoc(rbraceloc) |
Anders Carlsson | 66b5a8a | 2007-08-31 04:56:16 +0000 | [diff] [blame] | 258 | { |
Anders Carlsson | 66b5a8a | 2007-08-31 04:56:16 +0000 | [diff] [blame] | 259 | for (unsigned i = 0; i != numinits; i++) |
Steve Naroff | c5ae899 | 2008-05-01 02:04:18 +0000 | [diff] [blame] | 260 | InitExprs.push_back(initexprs[i]); |
Anders Carlsson | 66b5a8a | 2007-08-31 04:56:16 +0000 | [diff] [blame] | 261 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 262 | |
| 263 | //===----------------------------------------------------------------------===// |
| 264 | // Generic Expression Routines |
| 265 | //===----------------------------------------------------------------------===// |
| 266 | |
| 267 | /// hasLocalSideEffect - Return true if this immediate expression has side |
| 268 | /// effects, not counting any sub-expressions. |
| 269 | bool Expr::hasLocalSideEffect() const { |
| 270 | switch (getStmtClass()) { |
| 271 | default: |
| 272 | return false; |
| 273 | case ParenExprClass: |
| 274 | return cast<ParenExpr>(this)->getSubExpr()->hasLocalSideEffect(); |
| 275 | case UnaryOperatorClass: { |
| 276 | const UnaryOperator *UO = cast<UnaryOperator>(this); |
| 277 | |
| 278 | switch (UO->getOpcode()) { |
| 279 | default: return false; |
| 280 | case UnaryOperator::PostInc: |
| 281 | case UnaryOperator::PostDec: |
| 282 | case UnaryOperator::PreInc: |
| 283 | case UnaryOperator::PreDec: |
| 284 | return true; // ++/-- |
| 285 | |
| 286 | case UnaryOperator::Deref: |
| 287 | // Dereferencing a volatile pointer is a side-effect. |
| 288 | return getType().isVolatileQualified(); |
| 289 | case UnaryOperator::Real: |
| 290 | case UnaryOperator::Imag: |
| 291 | // accessing a piece of a volatile complex is a side-effect. |
| 292 | return UO->getSubExpr()->getType().isVolatileQualified(); |
| 293 | |
| 294 | case UnaryOperator::Extension: |
| 295 | return UO->getSubExpr()->hasLocalSideEffect(); |
| 296 | } |
| 297 | } |
Chris Lattner | e7716e6 | 2007-12-01 06:07:34 +0000 | [diff] [blame] | 298 | case BinaryOperatorClass: { |
| 299 | const BinaryOperator *BinOp = cast<BinaryOperator>(this); |
| 300 | // Consider comma to have side effects if the LHS and RHS both do. |
| 301 | if (BinOp->getOpcode() == BinaryOperator::Comma) |
| 302 | return BinOp->getLHS()->hasLocalSideEffect() && |
| 303 | BinOp->getRHS()->hasLocalSideEffect(); |
| 304 | |
| 305 | return BinOp->isAssignmentOp(); |
| 306 | } |
Chris Lattner | eb14fe8 | 2007-08-25 02:00:02 +0000 | [diff] [blame] | 307 | case CompoundAssignOperatorClass: |
Chris Lattner | 1f683e9 | 2007-08-25 01:55:00 +0000 | [diff] [blame] | 308 | return true; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 309 | |
Fariborz Jahanian | ab38e4b | 2007-12-01 19:58:28 +0000 | [diff] [blame] | 310 | case ConditionalOperatorClass: { |
| 311 | const ConditionalOperator *Exp = cast<ConditionalOperator>(this); |
| 312 | return Exp->getCond()->hasLocalSideEffect() |
| 313 | || (Exp->getLHS() && Exp->getLHS()->hasLocalSideEffect()) |
| 314 | || (Exp->getRHS() && Exp->getRHS()->hasLocalSideEffect()); |
| 315 | } |
| 316 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 317 | case MemberExprClass: |
| 318 | case ArraySubscriptExprClass: |
| 319 | // If the base pointer or element is to a volatile pointer/field, accessing |
| 320 | // if is a side effect. |
| 321 | return getType().isVolatileQualified(); |
Eli Friedman | 211f6ad | 2008-05-27 15:24:04 +0000 | [diff] [blame^] | 322 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 323 | case CallExprClass: |
| 324 | // TODO: check attributes for pure/const. "void foo() { strlen("bar"); }" |
| 325 | // should warn. |
| 326 | return true; |
Chris Lattner | a9c0102 | 2007-09-26 22:06:30 +0000 | [diff] [blame] | 327 | case ObjCMessageExprClass: |
| 328 | return true; |
Eli Friedman | 211f6ad | 2008-05-27 15:24:04 +0000 | [diff] [blame^] | 329 | case StmtExprClass: |
| 330 | // TODO: check the inside of the statement expression |
| 331 | return true; |
| 332 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 333 | case CastExprClass: |
| 334 | // If this is a cast to void, check the operand. Otherwise, the result of |
| 335 | // the cast is unused. |
| 336 | if (getType()->isVoidType()) |
| 337 | return cast<CastExpr>(this)->getSubExpr()->hasLocalSideEffect(); |
| 338 | return false; |
Chris Lattner | 0442108 | 2008-04-08 04:40:51 +0000 | [diff] [blame] | 339 | |
Eli Friedman | 4be1f47 | 2008-05-19 21:24:43 +0000 | [diff] [blame] | 340 | case ImplicitCastExprClass: |
| 341 | // Check the operand, since implicit casts are inserted by Sema |
| 342 | return cast<ImplicitCastExpr>(this)->getSubExpr()->hasLocalSideEffect(); |
| 343 | |
Chris Lattner | 0442108 | 2008-04-08 04:40:51 +0000 | [diff] [blame] | 344 | case CXXDefaultArgExprClass: |
| 345 | return cast<CXXDefaultArgExpr>(this)->getExpr()->hasLocalSideEffect(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 346 | } |
| 347 | } |
| 348 | |
| 349 | /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or an |
| 350 | /// incomplete type other than void. Nonarray expressions that can be lvalues: |
| 351 | /// - name, where name must be a variable |
| 352 | /// - e[i] |
| 353 | /// - (e), where e must be an lvalue |
| 354 | /// - e.name, where e must be an lvalue |
| 355 | /// - e->name |
| 356 | /// - *e, the type of e cannot be a function type |
| 357 | /// - string-constant |
Chris Lattner | 7da36f6 | 2007-10-30 22:53:42 +0000 | [diff] [blame] | 358 | /// - (__real__ e) and (__imag__ e) where e is an lvalue [GNU extension] |
Bill Wendling | 08ad47c | 2007-07-17 03:52:31 +0000 | [diff] [blame] | 359 | /// - reference type [C++ [expr]] |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 360 | /// |
Bill Wendling | ca51c97 | 2007-07-16 07:07:56 +0000 | [diff] [blame] | 361 | Expr::isLvalueResult Expr::isLvalue() const { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 362 | // first, check the type (C99 6.3.2.1) |
Chris Lattner | cb4f9a6 | 2007-07-21 05:33:26 +0000 | [diff] [blame] | 363 | if (TR->isFunctionType()) // from isObjectType() |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 364 | return LV_NotObjectType; |
| 365 | |
Steve Naroff | acb818a | 2008-02-10 01:39:04 +0000 | [diff] [blame] | 366 | // Allow qualified void which is an incomplete type other than void (yuck). |
Chris Lattner | f46699c | 2008-02-20 20:55:12 +0000 | [diff] [blame] | 367 | if (TR->isVoidType() && !TR.getCanonicalType().getCVRQualifiers()) |
Steve Naroff | acb818a | 2008-02-10 01:39:04 +0000 | [diff] [blame] | 368 | return LV_IncompleteVoidType; |
| 369 | |
Chris Lattner | cb4f9a6 | 2007-07-21 05:33:26 +0000 | [diff] [blame] | 370 | if (TR->isReferenceType()) // C++ [expr] |
Bill Wendling | 08ad47c | 2007-07-17 03:52:31 +0000 | [diff] [blame] | 371 | return LV_Valid; |
| 372 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 373 | // the type looks fine, now check the expression |
| 374 | switch (getStmtClass()) { |
| 375 | case StringLiteralClass: // C99 6.5.1p4 |
Anders Carlsson | 7323a62 | 2007-11-30 22:47:59 +0000 | [diff] [blame] | 376 | return LV_Valid; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 377 | case ArraySubscriptExprClass: // C99 6.5.3p4 (e1[e2] == (*((e1)+(e2)))) |
| 378 | // For vectors, make sure base is an lvalue (i.e. not a function call). |
| 379 | if (cast<ArraySubscriptExpr>(this)->getBase()->getType()->isVectorType()) |
| 380 | return cast<ArraySubscriptExpr>(this)->getBase()->isLvalue(); |
| 381 | return LV_Valid; |
| 382 | case DeclRefExprClass: // C99 6.5.1p2 |
| 383 | if (isa<VarDecl>(cast<DeclRefExpr>(this)->getDecl())) |
| 384 | return LV_Valid; |
| 385 | break; |
Anton Korobeynikov | fdd7566 | 2007-07-12 15:26:50 +0000 | [diff] [blame] | 386 | case MemberExprClass: { // C99 6.5.2.3p4 |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 387 | const MemberExpr *m = cast<MemberExpr>(this); |
| 388 | return m->isArrow() ? LV_Valid : m->getBase()->isLvalue(); |
Anton Korobeynikov | fdd7566 | 2007-07-12 15:26:50 +0000 | [diff] [blame] | 389 | } |
Chris Lattner | 7da36f6 | 2007-10-30 22:53:42 +0000 | [diff] [blame] | 390 | case UnaryOperatorClass: |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 391 | if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Deref) |
Chris Lattner | 7da36f6 | 2007-10-30 22:53:42 +0000 | [diff] [blame] | 392 | return LV_Valid; // C99 6.5.3p4 |
| 393 | |
| 394 | if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Real || |
| 395 | cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag) |
| 396 | return cast<UnaryOperator>(this)->getSubExpr()->isLvalue(); // GNU. |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 397 | break; |
| 398 | case ParenExprClass: // C99 6.5.1p5 |
| 399 | return cast<ParenExpr>(this)->getSubExpr()->isLvalue(); |
Steve Naroff | e638639 | 2007-12-05 04:00:10 +0000 | [diff] [blame] | 400 | case CompoundLiteralExprClass: // C99 6.5.2.5p5 |
| 401 | return LV_Valid; |
Nate Begeman | 213541a | 2008-04-18 23:10:10 +0000 | [diff] [blame] | 402 | case ExtVectorElementExprClass: |
| 403 | if (cast<ExtVectorElementExpr>(this)->containsDuplicateElements()) |
Steve Naroff | fec0b49 | 2007-07-30 03:29:09 +0000 | [diff] [blame] | 404 | return LV_DuplicateVectorComponents; |
| 405 | return LV_Valid; |
Steve Naroff | 027282d | 2007-11-12 14:34:27 +0000 | [diff] [blame] | 406 | case ObjCIvarRefExprClass: // ObjC instance variables are lvalues. |
| 407 | return LV_Valid; |
Chris Lattner | fa28b30 | 2008-01-12 08:14:25 +0000 | [diff] [blame] | 408 | case PreDefinedExprClass: |
| 409 | return LV_Valid; |
Chris Lattner | 0442108 | 2008-04-08 04:40:51 +0000 | [diff] [blame] | 410 | case CXXDefaultArgExprClass: |
| 411 | return cast<CXXDefaultArgExpr>(this)->getExpr()->isLvalue(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 412 | default: |
| 413 | break; |
| 414 | } |
| 415 | return LV_InvalidExpression; |
| 416 | } |
| 417 | |
| 418 | /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, |
| 419 | /// does not have an incomplete type, does not have a const-qualified type, and |
| 420 | /// if it is a structure or union, does not have any member (including, |
| 421 | /// recursively, any member or element of all contained aggregates or unions) |
| 422 | /// with a const-qualified type. |
Bill Wendling | ca51c97 | 2007-07-16 07:07:56 +0000 | [diff] [blame] | 423 | Expr::isModifiableLvalueResult Expr::isModifiableLvalue() const { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 424 | isLvalueResult lvalResult = isLvalue(); |
| 425 | |
| 426 | switch (lvalResult) { |
| 427 | case LV_Valid: break; |
| 428 | case LV_NotObjectType: return MLV_NotObjectType; |
| 429 | case LV_IncompleteVoidType: return MLV_IncompleteVoidType; |
Steve Naroff | fec0b49 | 2007-07-30 03:29:09 +0000 | [diff] [blame] | 430 | case LV_DuplicateVectorComponents: return MLV_DuplicateVectorComponents; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 431 | case LV_InvalidExpression: return MLV_InvalidExpression; |
| 432 | } |
| 433 | if (TR.isConstQualified()) |
| 434 | return MLV_ConstQualified; |
| 435 | if (TR->isArrayType()) |
| 436 | return MLV_ArrayType; |
| 437 | if (TR->isIncompleteType()) |
| 438 | return MLV_IncompleteType; |
| 439 | |
| 440 | if (const RecordType *r = dyn_cast<RecordType>(TR.getCanonicalType())) { |
| 441 | if (r->hasConstFields()) |
| 442 | return MLV_ConstQualified; |
| 443 | } |
| 444 | return MLV_Valid; |
| 445 | } |
| 446 | |
Ted Kremenek | 2e5f54a | 2008-02-27 18:39:48 +0000 | [diff] [blame] | 447 | /// hasGlobalStorage - Return true if this expression has static storage |
Chris Lattner | 4cc6271 | 2007-11-27 21:35:27 +0000 | [diff] [blame] | 448 | /// duration. This means that the address of this expression is a link-time |
| 449 | /// constant. |
Ted Kremenek | 2e5f54a | 2008-02-27 18:39:48 +0000 | [diff] [blame] | 450 | bool Expr::hasGlobalStorage() const { |
Chris Lattner | 1d09ecc | 2007-11-13 18:05:45 +0000 | [diff] [blame] | 451 | switch (getStmtClass()) { |
| 452 | default: |
| 453 | return false; |
Chris Lattner | 4cc6271 | 2007-11-27 21:35:27 +0000 | [diff] [blame] | 454 | case ParenExprClass: |
Ted Kremenek | 2e5f54a | 2008-02-27 18:39:48 +0000 | [diff] [blame] | 455 | return cast<ParenExpr>(this)->getSubExpr()->hasGlobalStorage(); |
Chris Lattner | 4cc6271 | 2007-11-27 21:35:27 +0000 | [diff] [blame] | 456 | case ImplicitCastExprClass: |
Ted Kremenek | 2e5f54a | 2008-02-27 18:39:48 +0000 | [diff] [blame] | 457 | return cast<ImplicitCastExpr>(this)->getSubExpr()->hasGlobalStorage(); |
Steve Naroff | e9b1219 | 2008-01-14 18:19:28 +0000 | [diff] [blame] | 458 | case CompoundLiteralExprClass: |
| 459 | return cast<CompoundLiteralExpr>(this)->isFileScope(); |
Chris Lattner | 1d09ecc | 2007-11-13 18:05:45 +0000 | [diff] [blame] | 460 | case DeclRefExprClass: { |
| 461 | const Decl *D = cast<DeclRefExpr>(this)->getDecl(); |
| 462 | if (const VarDecl *VD = dyn_cast<VarDecl>(D)) |
Ted Kremenek | 2e5f54a | 2008-02-27 18:39:48 +0000 | [diff] [blame] | 463 | return VD->hasGlobalStorage(); |
Seo Sanghyeon | 63f067f | 2008-04-04 09:45:30 +0000 | [diff] [blame] | 464 | if (isa<FunctionDecl>(D)) |
| 465 | return true; |
Chris Lattner | 1d09ecc | 2007-11-13 18:05:45 +0000 | [diff] [blame] | 466 | return false; |
| 467 | } |
Chris Lattner | fb70806 | 2007-11-28 04:30:09 +0000 | [diff] [blame] | 468 | case MemberExprClass: { |
Chris Lattner | 1d09ecc | 2007-11-13 18:05:45 +0000 | [diff] [blame] | 469 | const MemberExpr *M = cast<MemberExpr>(this); |
Ted Kremenek | 2e5f54a | 2008-02-27 18:39:48 +0000 | [diff] [blame] | 470 | return !M->isArrow() && M->getBase()->hasGlobalStorage(); |
Chris Lattner | fb70806 | 2007-11-28 04:30:09 +0000 | [diff] [blame] | 471 | } |
Chris Lattner | 4cc6271 | 2007-11-27 21:35:27 +0000 | [diff] [blame] | 472 | case ArraySubscriptExprClass: |
Ted Kremenek | 2e5f54a | 2008-02-27 18:39:48 +0000 | [diff] [blame] | 473 | return cast<ArraySubscriptExpr>(this)->getBase()->hasGlobalStorage(); |
Chris Lattner | fa28b30 | 2008-01-12 08:14:25 +0000 | [diff] [blame] | 474 | case PreDefinedExprClass: |
| 475 | return true; |
Chris Lattner | 0442108 | 2008-04-08 04:40:51 +0000 | [diff] [blame] | 476 | case CXXDefaultArgExprClass: |
| 477 | return cast<CXXDefaultArgExpr>(this)->getExpr()->hasGlobalStorage(); |
Chris Lattner | 1d09ecc | 2007-11-13 18:05:45 +0000 | [diff] [blame] | 478 | } |
| 479 | } |
| 480 | |
Ted Kremenek | 4e99a5f | 2008-01-17 16:57:34 +0000 | [diff] [blame] | 481 | Expr* Expr::IgnoreParens() { |
| 482 | Expr* E = this; |
| 483 | while (ParenExpr* P = dyn_cast<ParenExpr>(E)) |
| 484 | E = P->getSubExpr(); |
| 485 | |
| 486 | return E; |
| 487 | } |
| 488 | |
Chris Lattner | 56f3494 | 2008-02-13 01:02:39 +0000 | [diff] [blame] | 489 | /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr |
| 490 | /// or CastExprs or ImplicitCastExprs, returning their operand. |
| 491 | Expr *Expr::IgnoreParenCasts() { |
| 492 | Expr *E = this; |
| 493 | while (true) { |
| 494 | if (ParenExpr *P = dyn_cast<ParenExpr>(E)) |
| 495 | E = P->getSubExpr(); |
| 496 | else if (CastExpr *P = dyn_cast<CastExpr>(E)) |
| 497 | E = P->getSubExpr(); |
| 498 | else if (ImplicitCastExpr *P = dyn_cast<ImplicitCastExpr>(E)) |
| 499 | E = P->getSubExpr(); |
| 500 | else |
| 501 | return E; |
| 502 | } |
| 503 | } |
| 504 | |
| 505 | |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 506 | bool Expr::isConstantExpr(ASTContext &Ctx, SourceLocation *Loc) const { |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 507 | switch (getStmtClass()) { |
| 508 | default: |
| 509 | if (Loc) *Loc = getLocStart(); |
| 510 | return false; |
| 511 | case ParenExprClass: |
| 512 | return cast<ParenExpr>(this)->getSubExpr()->isConstantExpr(Ctx, Loc); |
| 513 | case StringLiteralClass: |
Steve Naroff | 5d37e32 | 2007-11-09 15:00:03 +0000 | [diff] [blame] | 514 | case ObjCStringLiteralClass: |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 515 | case FloatingLiteralClass: |
| 516 | case IntegerLiteralClass: |
| 517 | case CharacterLiteralClass: |
| 518 | case ImaginaryLiteralClass: |
Anders Carlsson | 1a86b33 | 2007-10-17 00:52:43 +0000 | [diff] [blame] | 519 | case TypesCompatibleExprClass: |
| 520 | case CXXBoolLiteralExprClass: |
Chris Lattner | 2777e49 | 2007-10-18 00:20:32 +0000 | [diff] [blame] | 521 | return true; |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 522 | case CallExprClass: { |
| 523 | const CallExpr *CE = cast<CallExpr>(this); |
Steve Naroff | c4f8e8b | 2008-01-31 01:07:12 +0000 | [diff] [blame] | 524 | if (CE->isBuiltinConstantExpr()) |
| 525 | return true; |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 526 | if (Loc) *Loc = getLocStart(); |
| 527 | return false; |
| 528 | } |
Chris Lattner | 4ef8dd6 | 2007-11-01 02:45:17 +0000 | [diff] [blame] | 529 | case DeclRefExprClass: { |
| 530 | const Decl *D = cast<DeclRefExpr>(this)->getDecl(); |
| 531 | // Accept address of function. |
| 532 | if (isa<EnumConstantDecl>(D) || isa<FunctionDecl>(D)) |
Chris Lattner | 2777e49 | 2007-10-18 00:20:32 +0000 | [diff] [blame] | 533 | return true; |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 534 | if (Loc) *Loc = getLocStart(); |
Chris Lattner | 1d09ecc | 2007-11-13 18:05:45 +0000 | [diff] [blame] | 535 | if (isa<VarDecl>(D)) |
| 536 | return TR->isArrayType(); |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 537 | return false; |
Chris Lattner | 4ef8dd6 | 2007-11-01 02:45:17 +0000 | [diff] [blame] | 538 | } |
Steve Naroff | b8f13a8 | 2008-01-09 00:05:37 +0000 | [diff] [blame] | 539 | case CompoundLiteralExprClass: |
| 540 | if (Loc) *Loc = getLocStart(); |
| 541 | // Allow "(int []){2,4}", since the array will be converted to a pointer. |
Nate Begeman | d47d4f5 | 2008-01-25 05:34:48 +0000 | [diff] [blame] | 542 | // Allow "(vector type){2,4}" since the elements are all constant. |
| 543 | return TR->isArrayType() || TR->isVectorType(); |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 544 | case UnaryOperatorClass: { |
| 545 | const UnaryOperator *Exp = cast<UnaryOperator>(this); |
| 546 | |
Chris Lattner | 1d09ecc | 2007-11-13 18:05:45 +0000 | [diff] [blame] | 547 | // C99 6.6p9 |
Chris Lattner | 239c15e | 2007-12-11 23:11:17 +0000 | [diff] [blame] | 548 | if (Exp->getOpcode() == UnaryOperator::AddrOf) { |
Ted Kremenek | 2e5f54a | 2008-02-27 18:39:48 +0000 | [diff] [blame] | 549 | if (!Exp->getSubExpr()->hasGlobalStorage()) { |
Chris Lattner | 239c15e | 2007-12-11 23:11:17 +0000 | [diff] [blame] | 550 | if (Loc) *Loc = getLocStart(); |
| 551 | return false; |
| 552 | } |
| 553 | return true; |
| 554 | } |
Chris Lattner | 1d09ecc | 2007-11-13 18:05:45 +0000 | [diff] [blame] | 555 | |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 556 | // Get the operand value. If this is sizeof/alignof, do not evalute the |
| 557 | // operand. This affects C99 6.6p3. |
Steve Naroff | d0091aa | 2008-01-10 22:15:12 +0000 | [diff] [blame] | 558 | if (!Exp->isSizeOfAlignOfOp() && |
| 559 | Exp->getOpcode() != UnaryOperator::OffsetOf && |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 560 | !Exp->getSubExpr()->isConstantExpr(Ctx, Loc)) |
| 561 | return false; |
| 562 | |
| 563 | switch (Exp->getOpcode()) { |
| 564 | // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. |
| 565 | // See C99 6.6p3. |
| 566 | default: |
| 567 | if (Loc) *Loc = Exp->getOperatorLoc(); |
| 568 | return false; |
| 569 | case UnaryOperator::Extension: |
| 570 | return true; // FIXME: this is wrong. |
| 571 | case UnaryOperator::SizeOf: |
| 572 | case UnaryOperator::AlignOf: |
Steve Naroff | d0091aa | 2008-01-10 22:15:12 +0000 | [diff] [blame] | 573 | case UnaryOperator::OffsetOf: |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 574 | // sizeof(vla) is not a constantexpr: C99 6.5.3.4p2. |
Eli Friedman | 3c2b317 | 2008-02-15 12:20:59 +0000 | [diff] [blame] | 575 | if (!Exp->getSubExpr()->getType()->isConstantSizeType()) { |
Chris Lattner | 6538347 | 2007-12-18 07:15:40 +0000 | [diff] [blame] | 576 | if (Loc) *Loc = Exp->getOperatorLoc(); |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 577 | return false; |
Chris Lattner | 6538347 | 2007-12-18 07:15:40 +0000 | [diff] [blame] | 578 | } |
Chris Lattner | 2777e49 | 2007-10-18 00:20:32 +0000 | [diff] [blame] | 579 | return true; |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 580 | case UnaryOperator::LNot: |
| 581 | case UnaryOperator::Plus: |
| 582 | case UnaryOperator::Minus: |
| 583 | case UnaryOperator::Not: |
Chris Lattner | 2777e49 | 2007-10-18 00:20:32 +0000 | [diff] [blame] | 584 | return true; |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 585 | } |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 586 | } |
| 587 | case SizeOfAlignOfTypeExprClass: { |
| 588 | const SizeOfAlignOfTypeExpr *Exp = cast<SizeOfAlignOfTypeExpr>(this); |
| 589 | // alignof always evaluates to a constant. |
Chris Lattner | a269ebf | 2008-02-21 05:45:29 +0000 | [diff] [blame] | 590 | if (Exp->isSizeOf() && !Exp->getArgumentType()->isVoidType() && |
| 591 | !Exp->getArgumentType()->isConstantSizeType()) { |
Chris Lattner | 6538347 | 2007-12-18 07:15:40 +0000 | [diff] [blame] | 592 | if (Loc) *Loc = Exp->getOperatorLoc(); |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 593 | return false; |
Chris Lattner | 6538347 | 2007-12-18 07:15:40 +0000 | [diff] [blame] | 594 | } |
Chris Lattner | 2777e49 | 2007-10-18 00:20:32 +0000 | [diff] [blame] | 595 | return true; |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 596 | } |
| 597 | case BinaryOperatorClass: { |
| 598 | const BinaryOperator *Exp = cast<BinaryOperator>(this); |
| 599 | |
| 600 | // The LHS of a constant expr is always evaluated and needed. |
| 601 | if (!Exp->getLHS()->isConstantExpr(Ctx, Loc)) |
| 602 | return false; |
| 603 | |
| 604 | if (!Exp->getRHS()->isConstantExpr(Ctx, Loc)) |
| 605 | return false; |
Chris Lattner | 2777e49 | 2007-10-18 00:20:32 +0000 | [diff] [blame] | 606 | return true; |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 607 | } |
| 608 | case ImplicitCastExprClass: |
| 609 | case CastExprClass: { |
| 610 | const Expr *SubExpr; |
| 611 | SourceLocation CastLoc; |
| 612 | if (const CastExpr *C = dyn_cast<CastExpr>(this)) { |
| 613 | SubExpr = C->getSubExpr(); |
| 614 | CastLoc = C->getLParenLoc(); |
| 615 | } else { |
| 616 | SubExpr = cast<ImplicitCastExpr>(this)->getSubExpr(); |
| 617 | CastLoc = getLocStart(); |
| 618 | } |
| 619 | if (!SubExpr->isConstantExpr(Ctx, Loc)) { |
| 620 | if (Loc) *Loc = SubExpr->getLocStart(); |
| 621 | return false; |
| 622 | } |
Chris Lattner | 2777e49 | 2007-10-18 00:20:32 +0000 | [diff] [blame] | 623 | return true; |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 624 | } |
| 625 | case ConditionalOperatorClass: { |
| 626 | const ConditionalOperator *Exp = cast<ConditionalOperator>(this); |
Chris Lattner | 2777e49 | 2007-10-18 00:20:32 +0000 | [diff] [blame] | 627 | if (!Exp->getCond()->isConstantExpr(Ctx, Loc) || |
Anders Carlsson | 3907323 | 2007-11-30 19:04:31 +0000 | [diff] [blame] | 628 | // Handle the GNU extension for missing LHS. |
| 629 | !(Exp->getLHS() && Exp->getLHS()->isConstantExpr(Ctx, Loc)) || |
Chris Lattner | 2777e49 | 2007-10-18 00:20:32 +0000 | [diff] [blame] | 630 | !Exp->getRHS()->isConstantExpr(Ctx, Loc)) |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 631 | return false; |
Chris Lattner | 2777e49 | 2007-10-18 00:20:32 +0000 | [diff] [blame] | 632 | return true; |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 633 | } |
Steve Naroff | d0091aa | 2008-01-10 22:15:12 +0000 | [diff] [blame] | 634 | case InitListExprClass: { |
| 635 | const InitListExpr *Exp = cast<InitListExpr>(this); |
| 636 | unsigned numInits = Exp->getNumInits(); |
| 637 | for (unsigned i = 0; i < numInits; i++) { |
| 638 | if (!Exp->getInit(i)->isConstantExpr(Ctx, Loc)) { |
| 639 | if (Loc) *Loc = Exp->getInit(i)->getLocStart(); |
| 640 | return false; |
| 641 | } |
| 642 | } |
| 643 | return true; |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 644 | } |
Chris Lattner | 0442108 | 2008-04-08 04:40:51 +0000 | [diff] [blame] | 645 | case CXXDefaultArgExprClass: |
| 646 | return cast<CXXDefaultArgExpr>(this)->getExpr()->isConstantExpr(Ctx, Loc); |
Steve Naroff | d0091aa | 2008-01-10 22:15:12 +0000 | [diff] [blame] | 647 | } |
Steve Naroff | 38374b0 | 2007-09-02 20:30:18 +0000 | [diff] [blame] | 648 | } |
| 649 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 650 | /// isIntegerConstantExpr - this recursive routine will test if an expression is |
| 651 | /// an integer constant expression. Note: With the introduction of VLA's in |
| 652 | /// C99 the result of the sizeof operator is no longer always a constant |
| 653 | /// expression. The generalization of the wording to include any subexpression |
| 654 | /// that is not evaluated (C99 6.6p3) means that nonconstant subexpressions |
| 655 | /// can appear as operands to other operators (e.g. &&, ||, ?:). For instance, |
| 656 | /// "0 || f()" can be treated as a constant expression. In C90 this expression, |
| 657 | /// occurring in a context requiring a constant, would have been a constraint |
| 658 | /// violation. FIXME: This routine currently implements C90 semantics. |
| 659 | /// To properly implement C99 semantics this routine will need to evaluate |
| 660 | /// expressions involving operators previously mentioned. |
| 661 | |
| 662 | /// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, |
| 663 | /// comma, etc |
| 664 | /// |
| 665 | /// FIXME: This should ext-warn on overflow during evaluation! ISO C does not |
Chris Lattner | ccc213f | 2007-09-26 00:47:26 +0000 | [diff] [blame] | 666 | /// permit this. This includes things like (int)1e1000 |
Chris Lattner | ce0afc0 | 2007-07-18 05:21:20 +0000 | [diff] [blame] | 667 | /// |
| 668 | /// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof |
| 669 | /// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer |
| 670 | /// cast+dereference. |
Chris Lattner | 590b664 | 2007-07-15 23:26:56 +0000 | [diff] [blame] | 671 | bool Expr::isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, |
| 672 | SourceLocation *Loc, bool isEvaluated) const { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 673 | switch (getStmtClass()) { |
| 674 | default: |
| 675 | if (Loc) *Loc = getLocStart(); |
| 676 | return false; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 677 | case ParenExprClass: |
| 678 | return cast<ParenExpr>(this)->getSubExpr()-> |
Chris Lattner | 590b664 | 2007-07-15 23:26:56 +0000 | [diff] [blame] | 679 | isIntegerConstantExpr(Result, Ctx, Loc, isEvaluated); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 680 | case IntegerLiteralClass: |
| 681 | Result = cast<IntegerLiteral>(this)->getValue(); |
| 682 | break; |
Chris Lattner | 2eadfb6 | 2007-07-15 23:32:58 +0000 | [diff] [blame] | 683 | case CharacterLiteralClass: { |
| 684 | const CharacterLiteral *CL = cast<CharacterLiteral>(this); |
Chris Lattner | 98be494 | 2008-03-05 18:54:05 +0000 | [diff] [blame] | 685 | Result.zextOrTrunc(static_cast<uint32_t>(Ctx.getTypeSize(getType()))); |
Chris Lattner | 2eadfb6 | 2007-07-15 23:32:58 +0000 | [diff] [blame] | 686 | Result = CL->getValue(); |
Chris Lattner | f0fbcb3 | 2007-07-16 21:04:56 +0000 | [diff] [blame] | 687 | Result.setIsUnsigned(!getType()->isSignedIntegerType()); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 688 | break; |
Chris Lattner | 2eadfb6 | 2007-07-15 23:32:58 +0000 | [diff] [blame] | 689 | } |
Steve Naroff | 7b658aa | 2007-08-02 04:09:23 +0000 | [diff] [blame] | 690 | case TypesCompatibleExprClass: { |
| 691 | const TypesCompatibleExpr *TCE = cast<TypesCompatibleExpr>(this); |
Chris Lattner | 98be494 | 2008-03-05 18:54:05 +0000 | [diff] [blame] | 692 | Result.zextOrTrunc(static_cast<uint32_t>(Ctx.getTypeSize(getType()))); |
Steve Naroff | ec0550f | 2007-10-15 20:41:53 +0000 | [diff] [blame] | 693 | Result = Ctx.typesAreCompatible(TCE->getArgType1(), TCE->getArgType2()); |
Steve Naroff | 389cecc | 2007-08-02 00:13:27 +0000 | [diff] [blame] | 694 | break; |
Steve Naroff | 7b658aa | 2007-08-02 04:09:23 +0000 | [diff] [blame] | 695 | } |
Steve Naroff | 13b7c5f | 2007-08-08 22:15:55 +0000 | [diff] [blame] | 696 | case CallExprClass: { |
| 697 | const CallExpr *CE = cast<CallExpr>(this); |
Chris Lattner | 98be494 | 2008-03-05 18:54:05 +0000 | [diff] [blame] | 698 | Result.zextOrTrunc(static_cast<uint32_t>(Ctx.getTypeSize(getType()))); |
Steve Naroff | 13b7c5f | 2007-08-08 22:15:55 +0000 | [diff] [blame] | 699 | if (CE->isBuiltinClassifyType(Result)) |
| 700 | break; |
| 701 | if (Loc) *Loc = getLocStart(); |
| 702 | return false; |
| 703 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 704 | case DeclRefExprClass: |
| 705 | if (const EnumConstantDecl *D = |
| 706 | dyn_cast<EnumConstantDecl>(cast<DeclRefExpr>(this)->getDecl())) { |
| 707 | Result = D->getInitVal(); |
| 708 | break; |
| 709 | } |
| 710 | if (Loc) *Loc = getLocStart(); |
| 711 | return false; |
| 712 | case UnaryOperatorClass: { |
| 713 | const UnaryOperator *Exp = cast<UnaryOperator>(this); |
| 714 | |
| 715 | // Get the operand value. If this is sizeof/alignof, do not evalute the |
| 716 | // operand. This affects C99 6.6p3. |
Anders Carlsson | 5a1deb8 | 2008-01-29 15:56:48 +0000 | [diff] [blame] | 717 | if (!Exp->isSizeOfAlignOfOp() && !Exp->isOffsetOfOp() && |
Chris Lattner | 602dafd | 2007-08-23 21:42:50 +0000 | [diff] [blame] | 718 | !Exp->getSubExpr()->isIntegerConstantExpr(Result, Ctx, Loc,isEvaluated)) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 719 | return false; |
| 720 | |
| 721 | switch (Exp->getOpcode()) { |
| 722 | // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. |
| 723 | // See C99 6.6p3. |
| 724 | default: |
| 725 | if (Loc) *Loc = Exp->getOperatorLoc(); |
| 726 | return false; |
| 727 | case UnaryOperator::Extension: |
Chris Lattner | 76e773a | 2007-07-18 18:38:36 +0000 | [diff] [blame] | 728 | return true; // FIXME: this is wrong. |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 729 | case UnaryOperator::SizeOf: |
| 730 | case UnaryOperator::AlignOf: |
Chris Lattner | a269ebf | 2008-02-21 05:45:29 +0000 | [diff] [blame] | 731 | // Return the result in the right width. |
Chris Lattner | 98be494 | 2008-03-05 18:54:05 +0000 | [diff] [blame] | 732 | Result.zextOrTrunc(static_cast<uint32_t>(Ctx.getTypeSize(getType()))); |
Chris Lattner | a269ebf | 2008-02-21 05:45:29 +0000 | [diff] [blame] | 733 | |
| 734 | // sizeof(void) and __alignof__(void) = 1 as a gcc extension. |
| 735 | if (Exp->getSubExpr()->getType()->isVoidType()) { |
| 736 | Result = 1; |
| 737 | break; |
| 738 | } |
| 739 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 740 | // sizeof(vla) is not a constantexpr: C99 6.5.3.4p2. |
Eli Friedman | 3c2b317 | 2008-02-15 12:20:59 +0000 | [diff] [blame] | 741 | if (!Exp->getSubExpr()->getType()->isConstantSizeType()) { |
Chris Lattner | 6538347 | 2007-12-18 07:15:40 +0000 | [diff] [blame] | 742 | if (Loc) *Loc = Exp->getOperatorLoc(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 743 | return false; |
Chris Lattner | 6538347 | 2007-12-18 07:15:40 +0000 | [diff] [blame] | 744 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 745 | |
Chris Lattner | 76e773a | 2007-07-18 18:38:36 +0000 | [diff] [blame] | 746 | // Get information about the size or align. |
Chris Lattner | efdd157 | 2008-01-02 21:54:09 +0000 | [diff] [blame] | 747 | if (Exp->getSubExpr()->getType()->isFunctionType()) { |
| 748 | // GCC extension: sizeof(function) = 1. |
| 749 | Result = Exp->getOpcode() == UnaryOperator::AlignOf ? 4 : 1; |
Chris Lattner | da5a6b6 | 2007-11-27 18:22:04 +0000 | [diff] [blame] | 750 | } else { |
Chris Lattner | 98be494 | 2008-03-05 18:54:05 +0000 | [diff] [blame] | 751 | unsigned CharSize = Ctx.Target.getCharWidth(); |
Anders Carlsson | 64a31ef | 2008-02-18 07:10:45 +0000 | [diff] [blame] | 752 | if (Exp->getOpcode() == UnaryOperator::AlignOf) |
Chris Lattner | 98be494 | 2008-03-05 18:54:05 +0000 | [diff] [blame] | 753 | Result = Ctx.getTypeAlign(Exp->getSubExpr()->getType()) / CharSize; |
Anders Carlsson | 64a31ef | 2008-02-18 07:10:45 +0000 | [diff] [blame] | 754 | else |
Chris Lattner | 98be494 | 2008-03-05 18:54:05 +0000 | [diff] [blame] | 755 | Result = Ctx.getTypeSize(Exp->getSubExpr()->getType()) / CharSize; |
Chris Lattner | da5a6b6 | 2007-11-27 18:22:04 +0000 | [diff] [blame] | 756 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 757 | break; |
| 758 | case UnaryOperator::LNot: { |
Chris Lattner | bf75538 | 2008-01-25 19:16:19 +0000 | [diff] [blame] | 759 | bool Val = Result == 0; |
Chris Lattner | 98be494 | 2008-03-05 18:54:05 +0000 | [diff] [blame] | 760 | Result.zextOrTrunc(static_cast<uint32_t>(Ctx.getTypeSize(getType()))); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 761 | Result = Val; |
| 762 | break; |
| 763 | } |
| 764 | case UnaryOperator::Plus: |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 765 | break; |
| 766 | case UnaryOperator::Minus: |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 767 | Result = -Result; |
| 768 | break; |
| 769 | case UnaryOperator::Not: |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 770 | Result = ~Result; |
| 771 | break; |
Anders Carlsson | 5a1deb8 | 2008-01-29 15:56:48 +0000 | [diff] [blame] | 772 | case UnaryOperator::OffsetOf: |
| 773 | Result = Exp->evaluateOffsetOf(Ctx); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 774 | } |
| 775 | break; |
| 776 | } |
| 777 | case SizeOfAlignOfTypeExprClass: { |
| 778 | const SizeOfAlignOfTypeExpr *Exp = cast<SizeOfAlignOfTypeExpr>(this); |
Chris Lattner | a269ebf | 2008-02-21 05:45:29 +0000 | [diff] [blame] | 779 | |
| 780 | // Return the result in the right width. |
Chris Lattner | 98be494 | 2008-03-05 18:54:05 +0000 | [diff] [blame] | 781 | Result.zextOrTrunc(static_cast<uint32_t>(Ctx.getTypeSize(getType()))); |
Chris Lattner | a269ebf | 2008-02-21 05:45:29 +0000 | [diff] [blame] | 782 | |
| 783 | // sizeof(void) and __alignof__(void) = 1 as a gcc extension. |
| 784 | if (Exp->getArgumentType()->isVoidType()) { |
| 785 | Result = 1; |
| 786 | break; |
| 787 | } |
| 788 | |
| 789 | // alignof always evaluates to a constant, sizeof does if arg is not VLA. |
Eli Friedman | 3c2b317 | 2008-02-15 12:20:59 +0000 | [diff] [blame] | 790 | if (Exp->isSizeOf() && !Exp->getArgumentType()->isConstantSizeType()) { |
Chris Lattner | 6538347 | 2007-12-18 07:15:40 +0000 | [diff] [blame] | 791 | if (Loc) *Loc = Exp->getOperatorLoc(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 792 | return false; |
Chris Lattner | 6538347 | 2007-12-18 07:15:40 +0000 | [diff] [blame] | 793 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 794 | |
Chris Lattner | 76e773a | 2007-07-18 18:38:36 +0000 | [diff] [blame] | 795 | // Get information about the size or align. |
Chris Lattner | efdd157 | 2008-01-02 21:54:09 +0000 | [diff] [blame] | 796 | if (Exp->getArgumentType()->isFunctionType()) { |
| 797 | // GCC extension: sizeof(function) = 1. |
| 798 | Result = Exp->isSizeOf() ? 1 : 4; |
Anders Carlsson | 6a24acb | 2008-02-16 01:20:23 +0000 | [diff] [blame] | 799 | } else { |
Chris Lattner | 98be494 | 2008-03-05 18:54:05 +0000 | [diff] [blame] | 800 | unsigned CharSize = Ctx.Target.getCharWidth(); |
Anders Carlsson | 6a24acb | 2008-02-16 01:20:23 +0000 | [diff] [blame] | 801 | if (Exp->isSizeOf()) |
Chris Lattner | 98be494 | 2008-03-05 18:54:05 +0000 | [diff] [blame] | 802 | Result = Ctx.getTypeSize(Exp->getArgumentType()) / CharSize; |
Anders Carlsson | 6a24acb | 2008-02-16 01:20:23 +0000 | [diff] [blame] | 803 | else |
Chris Lattner | 98be494 | 2008-03-05 18:54:05 +0000 | [diff] [blame] | 804 | Result = Ctx.getTypeAlign(Exp->getArgumentType()) / CharSize; |
Ted Kremenek | 060e470 | 2007-12-17 17:38:43 +0000 | [diff] [blame] | 805 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 806 | break; |
| 807 | } |
| 808 | case BinaryOperatorClass: { |
| 809 | const BinaryOperator *Exp = cast<BinaryOperator>(this); |
| 810 | |
| 811 | // The LHS of a constant expr is always evaluated and needed. |
Chris Lattner | 590b664 | 2007-07-15 23:26:56 +0000 | [diff] [blame] | 812 | if (!Exp->getLHS()->isIntegerConstantExpr(Result, Ctx, Loc, isEvaluated)) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 813 | return false; |
| 814 | |
| 815 | llvm::APSInt RHS(Result); |
| 816 | |
| 817 | // The short-circuiting &&/|| operators don't necessarily evaluate their |
| 818 | // RHS. Make sure to pass isEvaluated down correctly. |
| 819 | if (Exp->isLogicalOp()) { |
| 820 | bool RHSEval; |
| 821 | if (Exp->getOpcode() == BinaryOperator::LAnd) |
| 822 | RHSEval = Result != 0; |
| 823 | else { |
| 824 | assert(Exp->getOpcode() == BinaryOperator::LOr &&"Unexpected logical"); |
| 825 | RHSEval = Result == 0; |
| 826 | } |
| 827 | |
Chris Lattner | 590b664 | 2007-07-15 23:26:56 +0000 | [diff] [blame] | 828 | if (!Exp->getRHS()->isIntegerConstantExpr(RHS, Ctx, Loc, |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 829 | isEvaluated & RHSEval)) |
| 830 | return false; |
| 831 | } else { |
Chris Lattner | 590b664 | 2007-07-15 23:26:56 +0000 | [diff] [blame] | 832 | if (!Exp->getRHS()->isIntegerConstantExpr(RHS, Ctx, Loc, isEvaluated)) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 833 | return false; |
| 834 | } |
| 835 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 836 | switch (Exp->getOpcode()) { |
| 837 | default: |
| 838 | if (Loc) *Loc = getLocStart(); |
| 839 | return false; |
| 840 | case BinaryOperator::Mul: |
| 841 | Result *= RHS; |
| 842 | break; |
| 843 | case BinaryOperator::Div: |
| 844 | if (RHS == 0) { |
| 845 | if (!isEvaluated) break; |
| 846 | if (Loc) *Loc = getLocStart(); |
| 847 | return false; |
| 848 | } |
| 849 | Result /= RHS; |
| 850 | break; |
| 851 | case BinaryOperator::Rem: |
| 852 | if (RHS == 0) { |
| 853 | if (!isEvaluated) break; |
| 854 | if (Loc) *Loc = getLocStart(); |
| 855 | return false; |
| 856 | } |
| 857 | Result %= RHS; |
| 858 | break; |
| 859 | case BinaryOperator::Add: Result += RHS; break; |
| 860 | case BinaryOperator::Sub: Result -= RHS; break; |
| 861 | case BinaryOperator::Shl: |
Chris Lattner | 701e5eb | 2007-09-04 02:45:27 +0000 | [diff] [blame] | 862 | Result <<= |
| 863 | static_cast<uint32_t>(RHS.getLimitedValue(Result.getBitWidth()-1)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 864 | break; |
| 865 | case BinaryOperator::Shr: |
Chris Lattner | 701e5eb | 2007-09-04 02:45:27 +0000 | [diff] [blame] | 866 | Result >>= |
| 867 | static_cast<uint32_t>(RHS.getLimitedValue(Result.getBitWidth()-1)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 868 | break; |
| 869 | case BinaryOperator::LT: Result = Result < RHS; break; |
| 870 | case BinaryOperator::GT: Result = Result > RHS; break; |
| 871 | case BinaryOperator::LE: Result = Result <= RHS; break; |
| 872 | case BinaryOperator::GE: Result = Result >= RHS; break; |
| 873 | case BinaryOperator::EQ: Result = Result == RHS; break; |
| 874 | case BinaryOperator::NE: Result = Result != RHS; break; |
| 875 | case BinaryOperator::And: Result &= RHS; break; |
| 876 | case BinaryOperator::Xor: Result ^= RHS; break; |
| 877 | case BinaryOperator::Or: Result |= RHS; break; |
| 878 | case BinaryOperator::LAnd: |
| 879 | Result = Result != 0 && RHS != 0; |
| 880 | break; |
| 881 | case BinaryOperator::LOr: |
| 882 | Result = Result != 0 || RHS != 0; |
| 883 | break; |
| 884 | |
| 885 | case BinaryOperator::Comma: |
| 886 | // C99 6.6p3: "shall not contain assignment, ..., or comma operators, |
| 887 | // *except* when they are contained within a subexpression that is not |
| 888 | // evaluated". Note that Assignment can never happen due to constraints |
| 889 | // on the LHS subexpr, so we don't need to check it here. |
| 890 | if (isEvaluated) { |
| 891 | if (Loc) *Loc = getLocStart(); |
| 892 | return false; |
| 893 | } |
| 894 | |
| 895 | // The result of the constant expr is the RHS. |
| 896 | Result = RHS; |
| 897 | return true; |
| 898 | } |
| 899 | |
| 900 | assert(!Exp->isAssignmentOp() && "LHS can't be a constant expr!"); |
| 901 | break; |
| 902 | } |
Chris Lattner | 26dc7b3 | 2007-07-15 23:54:50 +0000 | [diff] [blame] | 903 | case ImplicitCastExprClass: |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 904 | case CastExprClass: { |
Chris Lattner | 26dc7b3 | 2007-07-15 23:54:50 +0000 | [diff] [blame] | 905 | const Expr *SubExpr; |
| 906 | SourceLocation CastLoc; |
| 907 | if (const CastExpr *C = dyn_cast<CastExpr>(this)) { |
| 908 | SubExpr = C->getSubExpr(); |
| 909 | CastLoc = C->getLParenLoc(); |
| 910 | } else { |
| 911 | SubExpr = cast<ImplicitCastExpr>(this)->getSubExpr(); |
| 912 | CastLoc = getLocStart(); |
| 913 | } |
| 914 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 915 | // C99 6.6p6: shall only convert arithmetic types to integer types. |
Chris Lattner | 26dc7b3 | 2007-07-15 23:54:50 +0000 | [diff] [blame] | 916 | if (!SubExpr->getType()->isArithmeticType() || |
| 917 | !getType()->isIntegerType()) { |
| 918 | if (Loc) *Loc = SubExpr->getLocStart(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 919 | return false; |
| 920 | } |
Chris Lattner | 987b15d | 2007-09-22 19:04:13 +0000 | [diff] [blame] | 921 | |
Chris Lattner | 98be494 | 2008-03-05 18:54:05 +0000 | [diff] [blame] | 922 | uint32_t DestWidth = static_cast<uint32_t>(Ctx.getTypeSize(getType())); |
Chris Lattner | 987b15d | 2007-09-22 19:04:13 +0000 | [diff] [blame] | 923 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 924 | // Handle simple integer->integer casts. |
Chris Lattner | 26dc7b3 | 2007-07-15 23:54:50 +0000 | [diff] [blame] | 925 | if (SubExpr->getType()->isIntegerType()) { |
| 926 | if (!SubExpr->isIntegerConstantExpr(Result, Ctx, Loc, isEvaluated)) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 927 | return false; |
Chris Lattner | 26dc7b3 | 2007-07-15 23:54:50 +0000 | [diff] [blame] | 928 | |
| 929 | // Figure out if this is a truncate, extend or noop cast. |
Chris Lattner | 26dc7b3 | 2007-07-15 23:54:50 +0000 | [diff] [blame] | 930 | // If the input is signed, do a sign extend, noop, or truncate. |
Chris Lattner | c0a356b | 2008-01-09 18:59:34 +0000 | [diff] [blame] | 931 | if (getType()->isBooleanType()) { |
| 932 | // Conversion to bool compares against zero. |
| 933 | Result = Result != 0; |
| 934 | Result.zextOrTrunc(DestWidth); |
| 935 | } else if (SubExpr->getType()->isSignedIntegerType()) |
Chris Lattner | 26dc7b3 | 2007-07-15 23:54:50 +0000 | [diff] [blame] | 936 | Result.sextOrTrunc(DestWidth); |
| 937 | else // If the input is unsigned, do a zero extend, noop, or truncate. |
| 938 | Result.zextOrTrunc(DestWidth); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 939 | break; |
| 940 | } |
| 941 | |
| 942 | // Allow floating constants that are the immediate operands of casts or that |
| 943 | // are parenthesized. |
Chris Lattner | 26dc7b3 | 2007-07-15 23:54:50 +0000 | [diff] [blame] | 944 | const Expr *Operand = SubExpr; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 945 | while (const ParenExpr *PE = dyn_cast<ParenExpr>(Operand)) |
| 946 | Operand = PE->getSubExpr(); |
Chris Lattner | 987b15d | 2007-09-22 19:04:13 +0000 | [diff] [blame] | 947 | |
| 948 | // If this isn't a floating literal, we can't handle it. |
| 949 | const FloatingLiteral *FL = dyn_cast<FloatingLiteral>(Operand); |
| 950 | if (!FL) { |
| 951 | if (Loc) *Loc = Operand->getLocStart(); |
| 952 | return false; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 953 | } |
Chris Lattner | c0a356b | 2008-01-09 18:59:34 +0000 | [diff] [blame] | 954 | |
| 955 | // If the destination is boolean, compare against zero. |
| 956 | if (getType()->isBooleanType()) { |
| 957 | Result = !FL->getValue().isZero(); |
| 958 | Result.zextOrTrunc(DestWidth); |
| 959 | break; |
| 960 | } |
Chris Lattner | 987b15d | 2007-09-22 19:04:13 +0000 | [diff] [blame] | 961 | |
| 962 | // Determine whether we are converting to unsigned or signed. |
| 963 | bool DestSigned = getType()->isSignedIntegerType(); |
Chris Lattner | ccc213f | 2007-09-26 00:47:26 +0000 | [diff] [blame] | 964 | |
| 965 | // TODO: Warn on overflow, but probably not here: isIntegerConstantExpr can |
| 966 | // be called multiple times per AST. |
Chris Lattner | 987b15d | 2007-09-22 19:04:13 +0000 | [diff] [blame] | 967 | uint64_t Space[4]; |
Chris Lattner | ccc213f | 2007-09-26 00:47:26 +0000 | [diff] [blame] | 968 | (void)FL->getValue().convertToInteger(Space, DestWidth, DestSigned, |
| 969 | llvm::APFloat::rmTowardZero); |
Chris Lattner | 987b15d | 2007-09-22 19:04:13 +0000 | [diff] [blame] | 970 | Result = llvm::APInt(DestWidth, 4, Space); |
| 971 | break; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 972 | } |
| 973 | case ConditionalOperatorClass: { |
| 974 | const ConditionalOperator *Exp = cast<ConditionalOperator>(this); |
| 975 | |
Chris Lattner | 590b664 | 2007-07-15 23:26:56 +0000 | [diff] [blame] | 976 | if (!Exp->getCond()->isIntegerConstantExpr(Result, Ctx, Loc, isEvaluated)) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 977 | return false; |
| 978 | |
| 979 | const Expr *TrueExp = Exp->getLHS(); |
| 980 | const Expr *FalseExp = Exp->getRHS(); |
| 981 | if (Result == 0) std::swap(TrueExp, FalseExp); |
| 982 | |
| 983 | // Evaluate the false one first, discard the result. |
Anders Carlsson | 3907323 | 2007-11-30 19:04:31 +0000 | [diff] [blame] | 984 | if (FalseExp && !FalseExp->isIntegerConstantExpr(Result, Ctx, Loc, false)) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 985 | return false; |
| 986 | // Evalute the true one, capture the result. |
Anders Carlsson | 3907323 | 2007-11-30 19:04:31 +0000 | [diff] [blame] | 987 | if (TrueExp && |
| 988 | !TrueExp->isIntegerConstantExpr(Result, Ctx, Loc, isEvaluated)) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 989 | return false; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 990 | break; |
| 991 | } |
Chris Lattner | 0442108 | 2008-04-08 04:40:51 +0000 | [diff] [blame] | 992 | case CXXDefaultArgExprClass: |
| 993 | return cast<CXXDefaultArgExpr>(this) |
| 994 | ->isIntegerConstantExpr(Result, Ctx, Loc, isEvaluated); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 995 | } |
| 996 | |
| 997 | // Cases that are valid constant exprs fall through to here. |
| 998 | Result.setIsUnsigned(getType()->isUnsignedIntegerType()); |
| 999 | return true; |
| 1000 | } |
| 1001 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1002 | /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an |
| 1003 | /// integer constant expression with the value zero, or if this is one that is |
| 1004 | /// cast to void*. |
Chris Lattner | 590b664 | 2007-07-15 23:26:56 +0000 | [diff] [blame] | 1005 | bool Expr::isNullPointerConstant(ASTContext &Ctx) const { |
Steve Naroff | aa58f00 | 2008-01-14 16:10:57 +0000 | [diff] [blame] | 1006 | // Strip off a cast to void*, if it exists. |
| 1007 | if (const CastExpr *CE = dyn_cast<CastExpr>(this)) { |
| 1008 | // Check that it is a cast to void*. |
Eli Friedman | 4b3f9b3 | 2008-02-13 17:29:58 +0000 | [diff] [blame] | 1009 | if (const PointerType *PT = CE->getType()->getAsPointerType()) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1010 | QualType Pointee = PT->getPointeeType(); |
Chris Lattner | f46699c | 2008-02-20 20:55:12 +0000 | [diff] [blame] | 1011 | if (Pointee.getCVRQualifiers() == 0 && |
| 1012 | Pointee->isVoidType() && // to void* |
Steve Naroff | aa58f00 | 2008-01-14 16:10:57 +0000 | [diff] [blame] | 1013 | CE->getSubExpr()->getType()->isIntegerType()) // from int. |
| 1014 | return CE->getSubExpr()->isNullPointerConstant(Ctx); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1015 | } |
Steve Naroff | aa58f00 | 2008-01-14 16:10:57 +0000 | [diff] [blame] | 1016 | } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { |
| 1017 | // Ignore the ImplicitCastExpr type entirely. |
| 1018 | return ICE->getSubExpr()->isNullPointerConstant(Ctx); |
| 1019 | } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { |
| 1020 | // Accept ((void*)0) as a null pointer constant, as many other |
| 1021 | // implementations do. |
| 1022 | return PE->getSubExpr()->isNullPointerConstant(Ctx); |
Chris Lattner | 8123a95 | 2008-04-10 02:22:51 +0000 | [diff] [blame] | 1023 | } else if (const CXXDefaultArgExpr *DefaultArg |
| 1024 | = dyn_cast<CXXDefaultArgExpr>(this)) { |
Chris Lattner | 0442108 | 2008-04-08 04:40:51 +0000 | [diff] [blame] | 1025 | // See through default argument expressions |
| 1026 | return DefaultArg->getExpr()->isNullPointerConstant(Ctx); |
Steve Naroff | aaffbf7 | 2008-01-14 02:53:34 +0000 | [diff] [blame] | 1027 | } |
Steve Naroff | aa58f00 | 2008-01-14 16:10:57 +0000 | [diff] [blame] | 1028 | |
| 1029 | // This expression must be an integer type. |
| 1030 | if (!getType()->isIntegerType()) |
| 1031 | return false; |
| 1032 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1033 | // If we have an integer constant expression, we need to *evaluate* it and |
| 1034 | // test for the value 0. |
| 1035 | llvm::APSInt Val(32); |
Steve Naroff | aa58f00 | 2008-01-14 16:10:57 +0000 | [diff] [blame] | 1036 | return isIntegerConstantExpr(Val, Ctx, 0, true) && Val == 0; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1037 | } |
Steve Naroff | 31a4584 | 2007-07-28 23:10:27 +0000 | [diff] [blame] | 1038 | |
Nate Begeman | 213541a | 2008-04-18 23:10:10 +0000 | [diff] [blame] | 1039 | unsigned ExtVectorElementExpr::getNumElements() const { |
Nate Begeman | 8a99764 | 2008-05-09 06:41:27 +0000 | [diff] [blame] | 1040 | if (const VectorType *VT = getType()->getAsVectorType()) |
| 1041 | return VT->getNumElements(); |
| 1042 | return 1; |
Chris Lattner | 4d0ac88 | 2007-08-03 16:00:20 +0000 | [diff] [blame] | 1043 | } |
| 1044 | |
Nate Begeman | 8a99764 | 2008-05-09 06:41:27 +0000 | [diff] [blame] | 1045 | /// containsDuplicateElements - Return true if any element access is repeated. |
Nate Begeman | 213541a | 2008-04-18 23:10:10 +0000 | [diff] [blame] | 1046 | bool ExtVectorElementExpr::containsDuplicateElements() const { |
Steve Naroff | fec0b49 | 2007-07-30 03:29:09 +0000 | [diff] [blame] | 1047 | const char *compStr = Accessor.getName(); |
| 1048 | unsigned length = strlen(compStr); |
| 1049 | |
| 1050 | for (unsigned i = 0; i < length-1; i++) { |
| 1051 | const char *s = compStr+i; |
| 1052 | for (const char c = *s++; *s; s++) |
| 1053 | if (c == *s) |
| 1054 | return true; |
| 1055 | } |
| 1056 | return false; |
| 1057 | } |
Chris Lattner | b8f849d | 2007-08-02 23:36:59 +0000 | [diff] [blame] | 1058 | |
Nate Begeman | 8a99764 | 2008-05-09 06:41:27 +0000 | [diff] [blame] | 1059 | /// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. |
Nate Begeman | 3b8d116 | 2008-05-13 21:03:02 +0000 | [diff] [blame] | 1060 | void ExtVectorElementExpr::getEncodedElementAccess( |
| 1061 | llvm::SmallVectorImpl<unsigned> &Elts) const { |
Chris Lattner | b8f849d | 2007-08-02 23:36:59 +0000 | [diff] [blame] | 1062 | const char *compStr = Accessor.getName(); |
Nate Begeman | 8a99764 | 2008-05-09 06:41:27 +0000 | [diff] [blame] | 1063 | |
| 1064 | bool isHi = !strcmp(compStr, "hi"); |
| 1065 | bool isLo = !strcmp(compStr, "lo"); |
| 1066 | bool isEven = !strcmp(compStr, "e"); |
| 1067 | bool isOdd = !strcmp(compStr, "o"); |
| 1068 | |
| 1069 | for (unsigned i = 0, e = getNumElements(); i != e; ++i) { |
| 1070 | uint64_t Index; |
| 1071 | |
| 1072 | if (isHi) |
| 1073 | Index = e + i; |
| 1074 | else if (isLo) |
| 1075 | Index = i; |
| 1076 | else if (isEven) |
| 1077 | Index = 2 * i; |
| 1078 | else if (isOdd) |
| 1079 | Index = 2 * i + 1; |
| 1080 | else |
| 1081 | Index = ExtVectorType::getAccessorIdx(compStr[i]); |
Chris Lattner | b8f849d | 2007-08-02 23:36:59 +0000 | [diff] [blame] | 1082 | |
Nate Begeman | 3b8d116 | 2008-05-13 21:03:02 +0000 | [diff] [blame] | 1083 | Elts.push_back(Index); |
Chris Lattner | b8f849d | 2007-08-02 23:36:59 +0000 | [diff] [blame] | 1084 | } |
Nate Begeman | 8a99764 | 2008-05-09 06:41:27 +0000 | [diff] [blame] | 1085 | } |
| 1086 | |
Steve Naroff | 68d331a | 2007-09-27 14:38:14 +0000 | [diff] [blame] | 1087 | // constructor for instance messages. |
Steve Naroff | bcfb06a | 2007-09-28 22:22:11 +0000 | [diff] [blame] | 1088 | ObjCMessageExpr::ObjCMessageExpr(Expr *receiver, Selector selInfo, |
Ted Kremenek | a526c5c | 2008-01-07 19:49:32 +0000 | [diff] [blame] | 1089 | QualType retType, ObjCMethodDecl *mproto, |
Steve Naroff | db611d5 | 2007-11-03 16:37:59 +0000 | [diff] [blame] | 1090 | SourceLocation LBrac, SourceLocation RBrac, |
Steve Naroff | 49f109c | 2007-11-15 13:05:42 +0000 | [diff] [blame] | 1091 | Expr **ArgExprs, unsigned nargs) |
Steve Naroff | db611d5 | 2007-11-03 16:37:59 +0000 | [diff] [blame] | 1092 | : Expr(ObjCMessageExprClass, retType), SelName(selInfo), |
Ted Kremenek | ea958e57 | 2008-05-01 17:26:20 +0000 | [diff] [blame] | 1093 | MethodProto(mproto) { |
Steve Naroff | 49f109c | 2007-11-15 13:05:42 +0000 | [diff] [blame] | 1094 | NumArgs = nargs; |
| 1095 | SubExprs = new Expr*[NumArgs+1]; |
Steve Naroff | 68d331a | 2007-09-27 14:38:14 +0000 | [diff] [blame] | 1096 | SubExprs[RECEIVER] = receiver; |
Steve Naroff | 49f109c | 2007-11-15 13:05:42 +0000 | [diff] [blame] | 1097 | if (NumArgs) { |
| 1098 | for (unsigned i = 0; i != NumArgs; ++i) |
Steve Naroff | 68d331a | 2007-09-27 14:38:14 +0000 | [diff] [blame] | 1099 | SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); |
| 1100 | } |
Steve Naroff | 563477d | 2007-09-18 23:55:05 +0000 | [diff] [blame] | 1101 | LBracloc = LBrac; |
| 1102 | RBracloc = RBrac; |
| 1103 | } |
| 1104 | |
Steve Naroff | 68d331a | 2007-09-27 14:38:14 +0000 | [diff] [blame] | 1105 | // constructor for class messages. |
| 1106 | // FIXME: clsName should be typed to ObjCInterfaceType |
Steve Naroff | bcfb06a | 2007-09-28 22:22:11 +0000 | [diff] [blame] | 1107 | ObjCMessageExpr::ObjCMessageExpr(IdentifierInfo *clsName, Selector selInfo, |
Ted Kremenek | a526c5c | 2008-01-07 19:49:32 +0000 | [diff] [blame] | 1108 | QualType retType, ObjCMethodDecl *mproto, |
Steve Naroff | db611d5 | 2007-11-03 16:37:59 +0000 | [diff] [blame] | 1109 | SourceLocation LBrac, SourceLocation RBrac, |
Steve Naroff | 49f109c | 2007-11-15 13:05:42 +0000 | [diff] [blame] | 1110 | Expr **ArgExprs, unsigned nargs) |
Steve Naroff | db611d5 | 2007-11-03 16:37:59 +0000 | [diff] [blame] | 1111 | : Expr(ObjCMessageExprClass, retType), SelName(selInfo), |
Ted Kremenek | ea958e57 | 2008-05-01 17:26:20 +0000 | [diff] [blame] | 1112 | MethodProto(mproto) { |
Steve Naroff | 49f109c | 2007-11-15 13:05:42 +0000 | [diff] [blame] | 1113 | NumArgs = nargs; |
| 1114 | SubExprs = new Expr*[NumArgs+1]; |
Ted Kremenek | ea958e57 | 2008-05-01 17:26:20 +0000 | [diff] [blame] | 1115 | SubExprs[RECEIVER] = (Expr*) ((uintptr_t) clsName | 0x1); |
Steve Naroff | 49f109c | 2007-11-15 13:05:42 +0000 | [diff] [blame] | 1116 | if (NumArgs) { |
| 1117 | for (unsigned i = 0; i != NumArgs; ++i) |
Steve Naroff | 68d331a | 2007-09-27 14:38:14 +0000 | [diff] [blame] | 1118 | SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); |
| 1119 | } |
Steve Naroff | 563477d | 2007-09-18 23:55:05 +0000 | [diff] [blame] | 1120 | LBracloc = LBrac; |
| 1121 | RBracloc = RBrac; |
| 1122 | } |
| 1123 | |
Chris Lattner | 27437ca | 2007-10-25 00:29:32 +0000 | [diff] [blame] | 1124 | bool ChooseExpr::isConditionTrue(ASTContext &C) const { |
| 1125 | llvm::APSInt CondVal(32); |
| 1126 | bool IsConst = getCond()->isIntegerConstantExpr(CondVal, C); |
| 1127 | assert(IsConst && "Condition of choose expr must be i-c-e"); IsConst=IsConst; |
| 1128 | return CondVal != 0; |
| 1129 | } |
| 1130 | |
Anders Carlsson | 5a1deb8 | 2008-01-29 15:56:48 +0000 | [diff] [blame] | 1131 | static int64_t evaluateOffsetOf(ASTContext& C, const Expr *E) |
| 1132 | { |
| 1133 | if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) { |
| 1134 | QualType Ty = ME->getBase()->getType(); |
| 1135 | |
| 1136 | RecordDecl *RD = Ty->getAsRecordType()->getDecl(); |
Chris Lattner | 98be494 | 2008-03-05 18:54:05 +0000 | [diff] [blame] | 1137 | const ASTRecordLayout &RL = C.getASTRecordLayout(RD); |
Anders Carlsson | 5a1deb8 | 2008-01-29 15:56:48 +0000 | [diff] [blame] | 1138 | FieldDecl *FD = ME->getMemberDecl(); |
| 1139 | |
| 1140 | // FIXME: This is linear time. |
| 1141 | unsigned i = 0, e = 0; |
| 1142 | for (i = 0, e = RD->getNumMembers(); i != e; i++) { |
| 1143 | if (RD->getMember(i) == FD) |
| 1144 | break; |
| 1145 | } |
| 1146 | |
| 1147 | return RL.getFieldOffset(i) + evaluateOffsetOf(C, ME->getBase()); |
| 1148 | } else if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) { |
| 1149 | const Expr *Base = ASE->getBase(); |
| 1150 | llvm::APSInt Idx(32); |
| 1151 | bool ICE = ASE->getIdx()->isIntegerConstantExpr(Idx, C); |
| 1152 | assert(ICE && "Array index is not a constant integer!"); |
| 1153 | |
Chris Lattner | 98be494 | 2008-03-05 18:54:05 +0000 | [diff] [blame] | 1154 | int64_t size = C.getTypeSize(ASE->getType()); |
Anders Carlsson | 5a1deb8 | 2008-01-29 15:56:48 +0000 | [diff] [blame] | 1155 | size *= Idx.getSExtValue(); |
| 1156 | |
| 1157 | return size + evaluateOffsetOf(C, Base); |
| 1158 | } else if (isa<CompoundLiteralExpr>(E)) |
| 1159 | return 0; |
| 1160 | |
| 1161 | assert(0 && "Unknown offsetof subexpression!"); |
| 1162 | return 0; |
| 1163 | } |
| 1164 | |
| 1165 | int64_t UnaryOperator::evaluateOffsetOf(ASTContext& C) const |
| 1166 | { |
| 1167 | assert(Opc == OffsetOf && "Unary operator not offsetof!"); |
| 1168 | |
Chris Lattner | 98be494 | 2008-03-05 18:54:05 +0000 | [diff] [blame] | 1169 | unsigned CharSize = C.Target.getCharWidth(); |
Anders Carlsson | 5a1deb8 | 2008-01-29 15:56:48 +0000 | [diff] [blame] | 1170 | return ::evaluateOffsetOf(C, Val) / CharSize; |
| 1171 | } |
| 1172 | |
Ted Kremenek | 77ed8e4 | 2007-08-24 18:13:47 +0000 | [diff] [blame] | 1173 | //===----------------------------------------------------------------------===// |
| 1174 | // Child Iterators for iterating over subexpressions/substatements |
| 1175 | //===----------------------------------------------------------------------===// |
| 1176 | |
| 1177 | // DeclRefExpr |
Ted Kremenek | 9ac5928 | 2007-10-18 23:28:49 +0000 | [diff] [blame] | 1178 | Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } |
| 1179 | Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } |
Ted Kremenek | 77ed8e4 | 2007-08-24 18:13:47 +0000 | [diff] [blame] | 1180 | |
Steve Naroff | 7779db4 | 2007-11-12 14:29:37 +0000 | [diff] [blame] | 1181 | // ObjCIvarRefExpr |
Ted Kremenek | 9226197 | 2008-05-02 18:40:22 +0000 | [diff] [blame] | 1182 | Stmt::child_iterator ObjCIvarRefExpr::child_begin() { |
| 1183 | return reinterpret_cast<Stmt**>(&Base); |
| 1184 | } |
| 1185 | |
| 1186 | Stmt::child_iterator ObjCIvarRefExpr::child_end() { |
| 1187 | return reinterpret_cast<Stmt**>(&Base)+1; |
| 1188 | } |
Steve Naroff | 7779db4 | 2007-11-12 14:29:37 +0000 | [diff] [blame] | 1189 | |
Ted Kremenek | 77ed8e4 | 2007-08-24 18:13:47 +0000 | [diff] [blame] | 1190 | // PreDefinedExpr |
Ted Kremenek | 9ac5928 | 2007-10-18 23:28:49 +0000 | [diff] [blame] | 1191 | Stmt::child_iterator PreDefinedExpr::child_begin() { return child_iterator(); } |
| 1192 | Stmt::child_iterator PreDefinedExpr::child_end() { return child_iterator(); } |
Ted Kremenek | 77ed8e4 | 2007-08-24 18:13:47 +0000 | [diff] [blame] | 1193 | |
| 1194 | // IntegerLiteral |
Ted Kremenek | 9ac5928 | 2007-10-18 23:28:49 +0000 | [diff] [blame] | 1195 | Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } |
| 1196 | Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } |
Ted Kremenek | 77ed8e4 | 2007-08-24 18:13:47 +0000 | [diff] [blame] | 1197 | |
| 1198 | // CharacterLiteral |
Ted Kremenek | 9ac5928 | 2007-10-18 23:28:49 +0000 | [diff] [blame] | 1199 | Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator(); } |
| 1200 | Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } |
Ted Kremenek | 77ed8e4 | 2007-08-24 18:13:47 +0000 | [diff] [blame] | 1201 | |
| 1202 | // FloatingLiteral |
Ted Kremenek | 9ac5928 | 2007-10-18 23:28:49 +0000 | [diff] [blame] | 1203 | Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } |
| 1204 | Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } |
Ted Kremenek | 77ed8e4 | 2007-08-24 18:13:47 +0000 | [diff] [blame] | 1205 | |
Chris Lattner | 5d66145 | 2007-08-26 03:42:43 +0000 | [diff] [blame] | 1206 | // ImaginaryLiteral |
| 1207 | Stmt::child_iterator ImaginaryLiteral::child_begin() { |
| 1208 | return reinterpret_cast<Stmt**>(&Val); |
| 1209 | } |
| 1210 | Stmt::child_iterator ImaginaryLiteral::child_end() { |
| 1211 | return reinterpret_cast<Stmt**>(&Val)+1; |
| 1212 | } |
| 1213 | |
Ted Kremenek | 77ed8e4 | 2007-08-24 18:13:47 +0000 | [diff] [blame] | 1214 | // StringLiteral |
Ted Kremenek | 9ac5928 | 2007-10-18 23:28:49 +0000 | [diff] [blame] | 1215 | Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } |
| 1216 | Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } |
Ted Kremenek | 77ed8e4 | 2007-08-24 18:13:47 +0000 | [diff] [blame] | 1217 | |
| 1218 | // ParenExpr |
| 1219 | Stmt::child_iterator ParenExpr::child_begin() { |
| 1220 | return reinterpret_cast<Stmt**>(&Val); |
| 1221 | } |
Ted Kremenek | 77ed8e4 | 2007-08-24 18:13:47 +0000 | [diff] [blame] | 1222 | Stmt::child_iterator ParenExpr::child_end() { |
Chris Lattner | 5d66145 | 2007-08-26 03:42:43 +0000 | [diff] [blame] | 1223 | return reinterpret_cast<Stmt**>(&Val)+1; |
Ted Kremenek | 77ed8e4 | 2007-08-24 18:13:47 +0000 | [diff] [blame] | 1224 | } |
| 1225 | |
| 1226 | // UnaryOperator |
| 1227 | Stmt::child_iterator UnaryOperator::child_begin() { |
Ted Kremenek | f816f77 | 2007-12-15 00:39:18 +0000 | [diff] [blame] | 1228 | return reinterpret_cast<Stmt**>(&Val); |
Ted Kremenek | 77ed8e4 | 2007-08-24 18:13:47 +0000 | [diff] [blame] | 1229 | } |
Ted Kremenek | 77ed8e4 | 2007-08-24 18:13:47 +0000 | [diff] [blame] | 1230 | Stmt::child_iterator UnaryOperator::child_end() { |
Ted Kremenek | f816f77 | 2007-12-15 00:39:18 +0000 | [diff] [blame] | 1231 | return reinterpret_cast<Stmt**>(&Val+1); |
Ted Kremenek | 77ed8e4 | 2007-08-24 18:13:47 +0000 | [diff] [blame] | 1232 | } |
| 1233 | |
| 1234 | // SizeOfAlignOfTypeExpr |
Ted Kremenek | 9ac5928 | 2007-10-18 23:28:49 +0000 | [diff] [blame] | 1235 | Stmt::child_iterator SizeOfAlignOfTypeExpr::child_begin() { |
Ted Kremenek | 699e9fb | 2007-12-14 22:52:23 +0000 | [diff] [blame] | 1236 | // If the type is a VLA type (and not a typedef), the size expression of the |
| 1237 | // VLA needs to be treated as an executable expression. |
| 1238 | if (VariableArrayType* T = dyn_cast<VariableArrayType>(Ty.getTypePtr())) |
| 1239 | return child_iterator(T); |
| 1240 | else |
| 1241 | return child_iterator(); |
Ted Kremenek | 9ac5928 | 2007-10-18 23:28:49 +0000 | [diff] [blame] | 1242 | } |
| 1243 | Stmt::child_iterator SizeOfAlignOfTypeExpr::child_end() { |
Ted Kremenek | 699e9fb | 2007-12-14 22:52:23 +0000 | [diff] [blame] | 1244 | return child_iterator(); |
Ted Kremenek | 9ac5928 | 2007-10-18 23:28:49 +0000 | [diff] [blame] | 1245 | } |
Ted Kremenek | 77ed8e4 | 2007-08-24 18:13:47 +0000 | [diff] [blame] | 1246 | |
| 1247 | // ArraySubscriptExpr |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1248 | Stmt::child_iterator ArraySubscriptExpr::child_begin() { |
Ted Kremenek | 77ed8e4 | 2007-08-24 18:13:47 +0000 | [diff] [blame] | 1249 | return reinterpret_cast<Stmt**>(&SubExprs); |
| 1250 | } |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1251 | Stmt::child_iterator ArraySubscriptExpr::child_end() { |
Chris Lattner | 5d66145 | 2007-08-26 03:42:43 +0000 | [diff] [blame] | 1252 | return reinterpret_cast<Stmt**>(&SubExprs)+END_EXPR; |
Ted Kremenek | 77ed8e4 | 2007-08-24 18:13:47 +0000 | [diff] [blame] | 1253 | } |
| 1254 | |
| 1255 | // CallExpr |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1256 | Stmt::child_iterator CallExpr::child_begin() { |
Ted Kremenek | 42a2977 | 2007-08-27 21:11:44 +0000 | [diff] [blame] | 1257 | return reinterpret_cast<Stmt**>(&SubExprs[0]); |
Ted Kremenek | 77ed8e4 | 2007-08-24 18:13:47 +0000 | [diff] [blame] | 1258 | } |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1259 | Stmt::child_iterator CallExpr::child_end() { |
Ted Kremenek | 42a2977 | 2007-08-27 21:11:44 +0000 | [diff] [blame] | 1260 | return reinterpret_cast<Stmt**>(&SubExprs[NumArgs+ARGS_START]); |
Ted Kremenek | 77ed8e4 | 2007-08-24 18:13:47 +0000 | [diff] [blame] | 1261 | } |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1262 | |
| 1263 | // MemberExpr |
| 1264 | Stmt::child_iterator MemberExpr::child_begin() { |
| 1265 | return reinterpret_cast<Stmt**>(&Base); |
| 1266 | } |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1267 | Stmt::child_iterator MemberExpr::child_end() { |
Chris Lattner | 5d66145 | 2007-08-26 03:42:43 +0000 | [diff] [blame] | 1268 | return reinterpret_cast<Stmt**>(&Base)+1; |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1269 | } |
| 1270 | |
Nate Begeman | 213541a | 2008-04-18 23:10:10 +0000 | [diff] [blame] | 1271 | // ExtVectorElementExpr |
| 1272 | Stmt::child_iterator ExtVectorElementExpr::child_begin() { |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1273 | return reinterpret_cast<Stmt**>(&Base); |
| 1274 | } |
Nate Begeman | 213541a | 2008-04-18 23:10:10 +0000 | [diff] [blame] | 1275 | Stmt::child_iterator ExtVectorElementExpr::child_end() { |
Chris Lattner | 5d66145 | 2007-08-26 03:42:43 +0000 | [diff] [blame] | 1276 | return reinterpret_cast<Stmt**>(&Base)+1; |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1277 | } |
| 1278 | |
| 1279 | // CompoundLiteralExpr |
| 1280 | Stmt::child_iterator CompoundLiteralExpr::child_begin() { |
| 1281 | return reinterpret_cast<Stmt**>(&Init); |
| 1282 | } |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1283 | Stmt::child_iterator CompoundLiteralExpr::child_end() { |
Chris Lattner | 5d66145 | 2007-08-26 03:42:43 +0000 | [diff] [blame] | 1284 | return reinterpret_cast<Stmt**>(&Init)+1; |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1285 | } |
| 1286 | |
| 1287 | // ImplicitCastExpr |
| 1288 | Stmt::child_iterator ImplicitCastExpr::child_begin() { |
| 1289 | return reinterpret_cast<Stmt**>(&Op); |
| 1290 | } |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1291 | Stmt::child_iterator ImplicitCastExpr::child_end() { |
Chris Lattner | 5d66145 | 2007-08-26 03:42:43 +0000 | [diff] [blame] | 1292 | return reinterpret_cast<Stmt**>(&Op)+1; |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1293 | } |
| 1294 | |
| 1295 | // CastExpr |
| 1296 | Stmt::child_iterator CastExpr::child_begin() { |
| 1297 | return reinterpret_cast<Stmt**>(&Op); |
| 1298 | } |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1299 | Stmt::child_iterator CastExpr::child_end() { |
Chris Lattner | 5d66145 | 2007-08-26 03:42:43 +0000 | [diff] [blame] | 1300 | return reinterpret_cast<Stmt**>(&Op)+1; |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1301 | } |
| 1302 | |
| 1303 | // BinaryOperator |
| 1304 | Stmt::child_iterator BinaryOperator::child_begin() { |
| 1305 | return reinterpret_cast<Stmt**>(&SubExprs); |
| 1306 | } |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1307 | Stmt::child_iterator BinaryOperator::child_end() { |
Chris Lattner | 5d66145 | 2007-08-26 03:42:43 +0000 | [diff] [blame] | 1308 | return reinterpret_cast<Stmt**>(&SubExprs)+END_EXPR; |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1309 | } |
| 1310 | |
| 1311 | // ConditionalOperator |
| 1312 | Stmt::child_iterator ConditionalOperator::child_begin() { |
| 1313 | return reinterpret_cast<Stmt**>(&SubExprs); |
| 1314 | } |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1315 | Stmt::child_iterator ConditionalOperator::child_end() { |
Chris Lattner | 5d66145 | 2007-08-26 03:42:43 +0000 | [diff] [blame] | 1316 | return reinterpret_cast<Stmt**>(&SubExprs)+END_EXPR; |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1317 | } |
| 1318 | |
| 1319 | // AddrLabelExpr |
Ted Kremenek | 9ac5928 | 2007-10-18 23:28:49 +0000 | [diff] [blame] | 1320 | Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } |
| 1321 | Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1322 | |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1323 | // StmtExpr |
| 1324 | Stmt::child_iterator StmtExpr::child_begin() { |
| 1325 | return reinterpret_cast<Stmt**>(&SubStmt); |
| 1326 | } |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1327 | Stmt::child_iterator StmtExpr::child_end() { |
Chris Lattner | 5d66145 | 2007-08-26 03:42:43 +0000 | [diff] [blame] | 1328 | return reinterpret_cast<Stmt**>(&SubStmt)+1; |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1329 | } |
| 1330 | |
| 1331 | // TypesCompatibleExpr |
Ted Kremenek | 9ac5928 | 2007-10-18 23:28:49 +0000 | [diff] [blame] | 1332 | Stmt::child_iterator TypesCompatibleExpr::child_begin() { |
| 1333 | return child_iterator(); |
| 1334 | } |
| 1335 | |
| 1336 | Stmt::child_iterator TypesCompatibleExpr::child_end() { |
| 1337 | return child_iterator(); |
| 1338 | } |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1339 | |
| 1340 | // ChooseExpr |
| 1341 | Stmt::child_iterator ChooseExpr::child_begin() { |
| 1342 | return reinterpret_cast<Stmt**>(&SubExprs); |
| 1343 | } |
| 1344 | |
| 1345 | Stmt::child_iterator ChooseExpr::child_end() { |
Chris Lattner | 5d66145 | 2007-08-26 03:42:43 +0000 | [diff] [blame] | 1346 | return reinterpret_cast<Stmt**>(&SubExprs)+END_EXPR; |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1347 | } |
| 1348 | |
Nate Begeman | e2ce1d9 | 2008-01-17 17:46:27 +0000 | [diff] [blame] | 1349 | // OverloadExpr |
| 1350 | Stmt::child_iterator OverloadExpr::child_begin() { |
| 1351 | return reinterpret_cast<Stmt**>(&SubExprs[0]); |
| 1352 | } |
| 1353 | Stmt::child_iterator OverloadExpr::child_end() { |
Nate Begeman | 67295d0 | 2008-01-30 20:50:20 +0000 | [diff] [blame] | 1354 | return reinterpret_cast<Stmt**>(&SubExprs[NumExprs]); |
Nate Begeman | e2ce1d9 | 2008-01-17 17:46:27 +0000 | [diff] [blame] | 1355 | } |
| 1356 | |
Eli Friedman | d38617c | 2008-05-14 19:38:39 +0000 | [diff] [blame] | 1357 | // ShuffleVectorExpr |
| 1358 | Stmt::child_iterator ShuffleVectorExpr::child_begin() { |
| 1359 | return reinterpret_cast<Stmt**>(&SubExprs[0]); |
| 1360 | } |
| 1361 | Stmt::child_iterator ShuffleVectorExpr::child_end() { |
| 1362 | return reinterpret_cast<Stmt**>(&SubExprs[NumExprs]); |
| 1363 | } |
| 1364 | |
Anders Carlsson | 7c50aca | 2007-10-15 20:28:48 +0000 | [diff] [blame] | 1365 | // VAArgExpr |
| 1366 | Stmt::child_iterator VAArgExpr::child_begin() { |
| 1367 | return reinterpret_cast<Stmt**>(&Val); |
| 1368 | } |
| 1369 | |
| 1370 | Stmt::child_iterator VAArgExpr::child_end() { |
| 1371 | return reinterpret_cast<Stmt**>(&Val)+1; |
| 1372 | } |
| 1373 | |
Anders Carlsson | 66b5a8a | 2007-08-31 04:56:16 +0000 | [diff] [blame] | 1374 | // InitListExpr |
| 1375 | Stmt::child_iterator InitListExpr::child_begin() { |
Steve Naroff | 1a42a25 | 2008-05-07 17:35:03 +0000 | [diff] [blame] | 1376 | return reinterpret_cast<Stmt**>(InitExprs.size() ? |
| 1377 | &InitExprs[0] : 0); |
Anders Carlsson | 66b5a8a | 2007-08-31 04:56:16 +0000 | [diff] [blame] | 1378 | } |
| 1379 | Stmt::child_iterator InitListExpr::child_end() { |
Steve Naroff | 1a42a25 | 2008-05-07 17:35:03 +0000 | [diff] [blame] | 1380 | return reinterpret_cast<Stmt**>(InitExprs.size() ? |
| 1381 | &InitExprs[0] + InitExprs.size() : 0); |
Anders Carlsson | 66b5a8a | 2007-08-31 04:56:16 +0000 | [diff] [blame] | 1382 | } |
| 1383 | |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1384 | // ObjCStringLiteral |
Ted Kremenek | 9ac5928 | 2007-10-18 23:28:49 +0000 | [diff] [blame] | 1385 | Stmt::child_iterator ObjCStringLiteral::child_begin() { |
| 1386 | return child_iterator(); |
| 1387 | } |
| 1388 | Stmt::child_iterator ObjCStringLiteral::child_end() { |
| 1389 | return child_iterator(); |
| 1390 | } |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1391 | |
| 1392 | // ObjCEncodeExpr |
Ted Kremenek | 9ac5928 | 2007-10-18 23:28:49 +0000 | [diff] [blame] | 1393 | Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } |
| 1394 | Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } |
Ted Kremenek | 1237c67 | 2007-08-24 20:06:47 +0000 | [diff] [blame] | 1395 | |
Fariborz Jahanian | b62f681 | 2007-10-16 20:40:23 +0000 | [diff] [blame] | 1396 | // ObjCSelectorExpr |
Ted Kremenek | 9ac5928 | 2007-10-18 23:28:49 +0000 | [diff] [blame] | 1397 | Stmt::child_iterator ObjCSelectorExpr::child_begin() { |
| 1398 | return child_iterator(); |
| 1399 | } |
| 1400 | Stmt::child_iterator ObjCSelectorExpr::child_end() { |
| 1401 | return child_iterator(); |
| 1402 | } |
Fariborz Jahanian | b62f681 | 2007-10-16 20:40:23 +0000 | [diff] [blame] | 1403 | |
Fariborz Jahanian | 390d50a | 2007-10-17 16:58:11 +0000 | [diff] [blame] | 1404 | // ObjCProtocolExpr |
Ted Kremenek | 9ac5928 | 2007-10-18 23:28:49 +0000 | [diff] [blame] | 1405 | Stmt::child_iterator ObjCProtocolExpr::child_begin() { |
| 1406 | return child_iterator(); |
| 1407 | } |
| 1408 | Stmt::child_iterator ObjCProtocolExpr::child_end() { |
| 1409 | return child_iterator(); |
| 1410 | } |
Fariborz Jahanian | 390d50a | 2007-10-17 16:58:11 +0000 | [diff] [blame] | 1411 | |
Steve Naroff | 563477d | 2007-09-18 23:55:05 +0000 | [diff] [blame] | 1412 | // ObjCMessageExpr |
Ted Kremenek | ea958e57 | 2008-05-01 17:26:20 +0000 | [diff] [blame] | 1413 | Stmt::child_iterator ObjCMessageExpr::child_begin() { |
| 1414 | return reinterpret_cast<Stmt**>(&SubExprs[ getReceiver() ? 0 : ARGS_START ]); |
Steve Naroff | 563477d | 2007-09-18 23:55:05 +0000 | [diff] [blame] | 1415 | } |
| 1416 | Stmt::child_iterator ObjCMessageExpr::child_end() { |
Steve Naroff | 68d331a | 2007-09-27 14:38:14 +0000 | [diff] [blame] | 1417 | return reinterpret_cast<Stmt**>(&SubExprs[getNumArgs()+ARGS_START]); |
Steve Naroff | 563477d | 2007-09-18 23:55:05 +0000 | [diff] [blame] | 1418 | } |
| 1419 | |