Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1 | //===--- PPExpressions.cpp - Preprocessor Expression Evaluation -----------===// |
| 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 Preprocessor::EvaluateDirectiveExpression method, |
| 11 | // which parses and evaluates integer constant expressions for #if directives. |
| 12 | // |
| 13 | //===----------------------------------------------------------------------===// |
| 14 | // |
| 15 | // FIXME: implement testing for #assert's. |
| 16 | // |
| 17 | //===----------------------------------------------------------------------===// |
| 18 | |
| 19 | #include "clang/Lex/Preprocessor.h" |
| 20 | #include "clang/Lex/MacroInfo.h" |
| 21 | #include "clang/Lex/LiteralSupport.h" |
| 22 | #include "clang/Basic/TargetInfo.h" |
Chris Lattner | 500d329 | 2009-01-29 05:15:15 +0000 | [diff] [blame] | 23 | #include "clang/Lex/LexDiagnostic.h" |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 24 | #include "llvm/ADT/APSInt.h" |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 25 | using namespace clang; |
| 26 | |
Dan Gohman | 3c46e8d | 2010-07-26 21:25:24 +0000 | [diff] [blame^] | 27 | namespace { |
| 28 | |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 29 | /// PPValue - Represents the value of a subexpression of a preprocessor |
| 30 | /// conditional and the source range covered by it. |
| 31 | class PPValue { |
| 32 | SourceRange Range; |
| 33 | public: |
| 34 | llvm::APSInt Val; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 35 | |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 36 | // Default ctor - Construct an 'invalid' PPValue. |
| 37 | PPValue(unsigned BitWidth) : Val(BitWidth) {} |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 38 | |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 39 | unsigned getBitWidth() const { return Val.getBitWidth(); } |
| 40 | bool isUnsigned() const { return Val.isUnsigned(); } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 41 | |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 42 | const SourceRange &getRange() const { return Range; } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 43 | |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 44 | void setRange(SourceLocation L) { Range.setBegin(L); Range.setEnd(L); } |
| 45 | void setRange(SourceLocation B, SourceLocation E) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 46 | Range.setBegin(B); Range.setEnd(E); |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 47 | } |
| 48 | void setBegin(SourceLocation L) { Range.setBegin(L); } |
| 49 | void setEnd(SourceLocation L) { Range.setEnd(L); } |
| 50 | }; |
| 51 | |
Dan Gohman | 3c46e8d | 2010-07-26 21:25:24 +0000 | [diff] [blame^] | 52 | } |
| 53 | |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 54 | static bool EvaluateDirectiveSubExpr(PPValue &LHS, unsigned MinPrec, |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 55 | Token &PeekTok, bool ValueLive, |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 56 | Preprocessor &PP); |
| 57 | |
| 58 | /// DefinedTracker - This struct is used while parsing expressions to keep track |
| 59 | /// of whether !defined(X) has been seen. |
| 60 | /// |
| 61 | /// With this simple scheme, we handle the basic forms: |
| 62 | /// !defined(X) and !defined X |
| 63 | /// but we also trivially handle (silly) stuff like: |
| 64 | /// !!!defined(X) and +!defined(X) and !+!+!defined(X) and !(defined(X)). |
| 65 | struct DefinedTracker { |
| 66 | /// Each time a Value is evaluated, it returns information about whether the |
| 67 | /// parsed value is of the form defined(X), !defined(X) or is something else. |
| 68 | enum TrackerState { |
| 69 | DefinedMacro, // defined(X) |
| 70 | NotDefinedMacro, // !defined(X) |
| 71 | Unknown // Something else. |
| 72 | } State; |
| 73 | /// TheMacro - When the state is DefinedMacro or NotDefinedMacro, this |
| 74 | /// indicates the macro that was checked. |
| 75 | IdentifierInfo *TheMacro; |
| 76 | }; |
| 77 | |
John Thompson | a28cc09 | 2009-10-30 13:49:06 +0000 | [diff] [blame] | 78 | /// EvaluateDefined - Process a 'defined(sym)' expression. |
Chris Lattner | a3e008a | 2009-12-14 05:00:18 +0000 | [diff] [blame] | 79 | static bool EvaluateDefined(PPValue &Result, Token &PeekTok, DefinedTracker &DT, |
| 80 | bool ValueLive, Preprocessor &PP) { |
John Thompson | a28cc09 | 2009-10-30 13:49:06 +0000 | [diff] [blame] | 81 | IdentifierInfo *II; |
| 82 | Result.setBegin(PeekTok.getLocation()); |
| 83 | |
| 84 | // Get the next token, don't expand it. |
| 85 | PP.LexUnexpandedToken(PeekTok); |
| 86 | |
| 87 | // Two options, it can either be a pp-identifier or a (. |
| 88 | SourceLocation LParenLoc; |
| 89 | if (PeekTok.is(tok::l_paren)) { |
| 90 | // Found a paren, remember we saw it and skip it. |
| 91 | LParenLoc = PeekTok.getLocation(); |
| 92 | PP.LexUnexpandedToken(PeekTok); |
| 93 | } |
| 94 | |
| 95 | // If we don't have a pp-identifier now, this is an error. |
| 96 | if ((II = PeekTok.getIdentifierInfo()) == 0) { |
| 97 | PP.Diag(PeekTok, diag::err_pp_defined_requires_identifier); |
| 98 | return true; |
| 99 | } |
| 100 | |
| 101 | // Otherwise, we got an identifier, is it defined to something? |
| 102 | Result.Val = II->hasMacroDefinition(); |
| 103 | Result.Val.setIsUnsigned(false); // Result is signed intmax_t. |
| 104 | |
| 105 | // If there is a macro, mark it used. |
| 106 | if (Result.Val != 0 && ValueLive) { |
| 107 | MacroInfo *Macro = PP.getMacroInfo(II); |
| 108 | Macro->setIsUsed(true); |
| 109 | } |
| 110 | |
| 111 | // Consume identifier. |
| 112 | Result.setEnd(PeekTok.getLocation()); |
Chris Lattner | 1994315 | 2010-02-26 19:42:53 +0000 | [diff] [blame] | 113 | PP.LexUnexpandedToken(PeekTok); |
John Thompson | a28cc09 | 2009-10-30 13:49:06 +0000 | [diff] [blame] | 114 | |
| 115 | // If we are in parens, ensure we have a trailing ). |
| 116 | if (LParenLoc.isValid()) { |
| 117 | if (PeekTok.isNot(tok::r_paren)) { |
| 118 | PP.Diag(PeekTok.getLocation(), diag::err_pp_missing_rparen) << "defined"; |
| 119 | PP.Diag(LParenLoc, diag::note_matching) << "("; |
| 120 | return true; |
| 121 | } |
| 122 | // Consume the ). |
| 123 | Result.setEnd(PeekTok.getLocation()); |
| 124 | PP.LexNonComment(PeekTok); |
| 125 | } |
| 126 | |
| 127 | // Success, remember that we saw defined(X). |
| 128 | DT.State = DefinedTracker::DefinedMacro; |
| 129 | DT.TheMacro = II; |
| 130 | return false; |
| 131 | } |
| 132 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 133 | /// EvaluateValue - Evaluate the token PeekTok (and any others needed) and |
| 134 | /// return the computed value in Result. Return true if there was an error |
| 135 | /// parsing. This function also returns information about the form of the |
| 136 | /// expression in DT. See above for information on what DT means. |
| 137 | /// |
| 138 | /// If ValueLive is false, then this value is being evaluated in a context where |
| 139 | /// the result is not used. As such, avoid diagnostics that relate to |
| 140 | /// evaluation. |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 141 | static bool EvaluateValue(PPValue &Result, Token &PeekTok, DefinedTracker &DT, |
| 142 | bool ValueLive, Preprocessor &PP) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 143 | DT.State = DefinedTracker::Unknown; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 144 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 145 | // If this token's spelling is a pp-identifier, check to see if it is |
| 146 | // 'defined' or if it is a macro. Note that we check here because many |
| 147 | // keywords are pp-identifiers, so we can't check the kind. |
| 148 | if (IdentifierInfo *II = PeekTok.getIdentifierInfo()) { |
Chris Lattner | f880662 | 2009-12-14 04:26:45 +0000 | [diff] [blame] | 149 | // Handle "defined X" and "defined(X)". |
| 150 | if (II->isStr("defined")) |
John Thompson | a28cc09 | 2009-10-30 13:49:06 +0000 | [diff] [blame] | 151 | return(EvaluateDefined(Result, PeekTok, DT, ValueLive, PP)); |
Chris Lattner | f880662 | 2009-12-14 04:26:45 +0000 | [diff] [blame] | 152 | |
| 153 | // If this identifier isn't 'defined' or one of the special |
| 154 | // preprocessor keywords and it wasn't macro expanded, it turns |
| 155 | // into a simple 0, unless it is the C++ keyword "true", in which case it |
| 156 | // turns into "1". |
| 157 | if (ValueLive) |
| 158 | PP.Diag(PeekTok, diag::warn_pp_undef_identifier) << II; |
| 159 | Result.Val = II->getTokenID() == tok::kw_true; |
| 160 | Result.Val.setIsUnsigned(false); // "0" is signed intmax_t 0. |
| 161 | Result.setRange(PeekTok.getLocation()); |
| 162 | PP.LexNonComment(PeekTok); |
| 163 | return false; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 164 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 165 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 166 | switch (PeekTok.getKind()) { |
| 167 | default: // Non-value token. |
Chris Lattner | d98d975 | 2008-04-13 20:38:43 +0000 | [diff] [blame] | 168 | PP.Diag(PeekTok, diag::err_pp_expr_bad_token_start_expr); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 169 | return true; |
| 170 | case tok::eom: |
| 171 | case tok::r_paren: |
| 172 | // If there is no expression, report and exit. |
| 173 | PP.Diag(PeekTok, diag::err_pp_expected_value_in_expr); |
| 174 | return true; |
| 175 | case tok::numeric_constant: { |
| 176 | llvm::SmallString<64> IntegerBuffer; |
Douglas Gregor | 50f6af7 | 2010-03-16 05:20:39 +0000 | [diff] [blame] | 177 | bool NumberInvalid = false; |
| 178 | llvm::StringRef Spelling = PP.getSpelling(PeekTok, IntegerBuffer, |
| 179 | &NumberInvalid); |
| 180 | if (NumberInvalid) |
| 181 | return true; // a diagnostic was already reported |
| 182 | |
Benjamin Kramer | aeb863c | 2010-02-27 16:29:36 +0000 | [diff] [blame] | 183 | NumericLiteralParser Literal(Spelling.begin(), Spelling.end(), |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 184 | PeekTok.getLocation(), PP); |
| 185 | if (Literal.hadError) |
| 186 | return true; // a diagnostic was already reported. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 187 | |
Chris Lattner | 6e400c2 | 2007-08-26 03:29:23 +0000 | [diff] [blame] | 188 | if (Literal.isFloatingLiteral() || Literal.isImaginary) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 189 | PP.Diag(PeekTok, diag::err_pp_illegal_floating_literal); |
| 190 | return true; |
| 191 | } |
| 192 | assert(Literal.isIntegerLiteral() && "Unknown ppnumber"); |
| 193 | |
Neil Booth | b944951 | 2007-08-29 22:00:19 +0000 | [diff] [blame] | 194 | // long long is a C99 feature. |
| 195 | if (!PP.getLangOptions().C99 && !PP.getLangOptions().CPlusPlus0x |
Neil Booth | 79859c3 | 2007-08-29 22:13:52 +0000 | [diff] [blame] | 196 | && Literal.isLongLong) |
Neil Booth | b944951 | 2007-08-29 22:00:19 +0000 | [diff] [blame] | 197 | PP.Diag(PeekTok, diag::ext_longlong); |
| 198 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 199 | // Parse the integer literal into Result. |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 200 | if (Literal.GetIntegerValue(Result.Val)) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 201 | // Overflow parsing integer literal. |
| 202 | if (ValueLive) PP.Diag(PeekTok, diag::warn_integer_too_large); |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 203 | Result.Val.setIsUnsigned(true); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 204 | } else { |
| 205 | // Set the signedness of the result to match whether there was a U suffix |
| 206 | // or not. |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 207 | Result.Val.setIsUnsigned(Literal.isUnsigned); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 208 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 209 | // Detect overflow based on whether the value is signed. If signed |
| 210 | // and if the value is too large, emit a warning "integer constant is so |
| 211 | // large that it is unsigned" e.g. on 12345678901234567890 where intmax_t |
| 212 | // is 64-bits. |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 213 | if (!Literal.isUnsigned && Result.Val.isNegative()) { |
Chris Lattner | b081a35 | 2008-07-03 03:47:30 +0000 | [diff] [blame] | 214 | // Don't warn for a hex literal: 0x8000..0 shouldn't warn. |
| 215 | if (ValueLive && Literal.getRadix() != 16) |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 216 | PP.Diag(PeekTok, diag::warn_integer_too_large_for_signed); |
| 217 | Result.Val.setIsUnsigned(true); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 218 | } |
| 219 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 220 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 221 | // Consume the token. |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 222 | Result.setRange(PeekTok.getLocation()); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 223 | PP.LexNonComment(PeekTok); |
| 224 | return false; |
| 225 | } |
| 226 | case tok::char_constant: { // 'x' |
| 227 | llvm::SmallString<32> CharBuffer; |
Douglas Gregor | 50f6af7 | 2010-03-16 05:20:39 +0000 | [diff] [blame] | 228 | bool CharInvalid = false; |
| 229 | llvm::StringRef ThisTok = PP.getSpelling(PeekTok, CharBuffer, &CharInvalid); |
| 230 | if (CharInvalid) |
| 231 | return true; |
Benjamin Kramer | ddeea56 | 2010-02-27 13:44:12 +0000 | [diff] [blame] | 232 | |
| 233 | CharLiteralParser Literal(ThisTok.begin(), ThisTok.end(), |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 234 | PeekTok.getLocation(), PP); |
| 235 | if (Literal.hadError()) |
| 236 | return true; // A diagnostic was already emitted. |
| 237 | |
| 238 | // Character literals are always int or wchar_t, expand to intmax_t. |
Daniel Dunbar | 444be73 | 2009-11-13 05:51:54 +0000 | [diff] [blame] | 239 | const TargetInfo &TI = PP.getTargetInfo(); |
Eli Friedman | 2a1c363 | 2009-06-01 05:25:02 +0000 | [diff] [blame] | 240 | unsigned NumBits; |
| 241 | if (Literal.isMultiChar()) |
| 242 | NumBits = TI.getIntWidth(); |
Alisdair Meredith | f5c209d | 2009-07-14 06:30:34 +0000 | [diff] [blame] | 243 | else if (Literal.isWide()) |
| 244 | NumBits = TI.getWCharWidth(); |
Eli Friedman | 2a1c363 | 2009-06-01 05:25:02 +0000 | [diff] [blame] | 245 | else |
Alisdair Meredith | f5c209d | 2009-07-14 06:30:34 +0000 | [diff] [blame] | 246 | NumBits = TI.getCharWidth(); |
Eli Friedman | 2a1c363 | 2009-06-01 05:25:02 +0000 | [diff] [blame] | 247 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 248 | // Set the width. |
| 249 | llvm::APSInt Val(NumBits); |
| 250 | // Set the value. |
| 251 | Val = Literal.getValue(); |
| 252 | // Set the signedness. |
Eli Friedman | 15b9176 | 2009-06-05 07:05:05 +0000 | [diff] [blame] | 253 | Val.setIsUnsigned(!PP.getLangOptions().CharIsSigned); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 254 | |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 255 | if (Result.Val.getBitWidth() > Val.getBitWidth()) { |
| 256 | Result.Val = Val.extend(Result.Val.getBitWidth()); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 257 | } else { |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 258 | assert(Result.Val.getBitWidth() == Val.getBitWidth() && |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 259 | "intmax_t smaller than char/wchar_t?"); |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 260 | Result.Val = Val; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 261 | } |
| 262 | |
| 263 | // Consume the token. |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 264 | Result.setRange(PeekTok.getLocation()); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 265 | PP.LexNonComment(PeekTok); |
| 266 | return false; |
| 267 | } |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 268 | case tok::l_paren: { |
| 269 | SourceLocation Start = PeekTok.getLocation(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 270 | PP.LexNonComment(PeekTok); // Eat the (. |
| 271 | // Parse the value and if there are any binary operators involved, parse |
| 272 | // them. |
| 273 | if (EvaluateValue(Result, PeekTok, DT, ValueLive, PP)) return true; |
| 274 | |
| 275 | // If this is a silly value like (X), which doesn't need parens, check for |
| 276 | // !(defined X). |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 277 | if (PeekTok.is(tok::r_paren)) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 278 | // Just use DT unmodified as our result. |
| 279 | } else { |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 280 | // Otherwise, we have something like (x+y), and we consumed '(x'. |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 281 | if (EvaluateDirectiveSubExpr(Result, 1, PeekTok, ValueLive, PP)) |
| 282 | return true; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 283 | |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 284 | if (PeekTok.isNot(tok::r_paren)) { |
Chris Lattner | 204b2fe | 2008-11-18 21:48:13 +0000 | [diff] [blame] | 285 | PP.Diag(PeekTok.getLocation(), diag::err_pp_expected_rparen) |
| 286 | << Result.getRange(); |
Chris Lattner | 28eb7e9 | 2008-11-23 23:17:07 +0000 | [diff] [blame] | 287 | PP.Diag(Start, diag::note_matching) << "("; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 288 | return true; |
| 289 | } |
| 290 | DT.State = DefinedTracker::Unknown; |
| 291 | } |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 292 | Result.setRange(Start, PeekTok.getLocation()); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 293 | PP.LexNonComment(PeekTok); // Eat the ). |
| 294 | return false; |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 295 | } |
| 296 | case tok::plus: { |
| 297 | SourceLocation Start = PeekTok.getLocation(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 298 | // Unary plus doesn't modify the value. |
| 299 | PP.LexNonComment(PeekTok); |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 300 | if (EvaluateValue(Result, PeekTok, DT, ValueLive, PP)) return true; |
| 301 | Result.setBegin(Start); |
| 302 | return false; |
| 303 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 304 | case tok::minus: { |
| 305 | SourceLocation Loc = PeekTok.getLocation(); |
| 306 | PP.LexNonComment(PeekTok); |
| 307 | if (EvaluateValue(Result, PeekTok, DT, ValueLive, PP)) return true; |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 308 | Result.setBegin(Loc); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 309 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 310 | // C99 6.5.3.3p3: The sign of the result matches the sign of the operand. |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 311 | Result.Val = -Result.Val; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 312 | |
Chris Lattner | b081a35 | 2008-07-03 03:47:30 +0000 | [diff] [blame] | 313 | // -MININT is the only thing that overflows. Unsigned never overflows. |
| 314 | bool Overflow = !Result.isUnsigned() && Result.Val.isMinSignedValue(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 315 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 316 | // If this operator is live and overflowed, report the issue. |
| 317 | if (Overflow && ValueLive) |
Chris Lattner | 204b2fe | 2008-11-18 21:48:13 +0000 | [diff] [blame] | 318 | PP.Diag(Loc, diag::warn_pp_expr_overflow) << Result.getRange(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 319 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 320 | DT.State = DefinedTracker::Unknown; |
| 321 | return false; |
| 322 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 323 | |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 324 | case tok::tilde: { |
| 325 | SourceLocation Start = PeekTok.getLocation(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 326 | PP.LexNonComment(PeekTok); |
| 327 | if (EvaluateValue(Result, PeekTok, DT, ValueLive, PP)) return true; |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 328 | Result.setBegin(Start); |
| 329 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 330 | // C99 6.5.3.3p4: The sign of the result matches the sign of the operand. |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 331 | Result.Val = ~Result.Val; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 332 | DT.State = DefinedTracker::Unknown; |
| 333 | return false; |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 334 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 335 | |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 336 | case tok::exclaim: { |
| 337 | SourceLocation Start = PeekTok.getLocation(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 338 | PP.LexNonComment(PeekTok); |
| 339 | if (EvaluateValue(Result, PeekTok, DT, ValueLive, PP)) return true; |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 340 | Result.setBegin(Start); |
| 341 | Result.Val = !Result.Val; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 342 | // C99 6.5.3.3p5: The sign of the result is 'int', aka it is signed. |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 343 | Result.Val.setIsUnsigned(false); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 344 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 345 | if (DT.State == DefinedTracker::DefinedMacro) |
| 346 | DT.State = DefinedTracker::NotDefinedMacro; |
| 347 | else if (DT.State == DefinedTracker::NotDefinedMacro) |
| 348 | DT.State = DefinedTracker::DefinedMacro; |
| 349 | return false; |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 350 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 351 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 352 | // FIXME: Handle #assert |
| 353 | } |
| 354 | } |
| 355 | |
| 356 | |
| 357 | |
| 358 | /// getPrecedence - Return the precedence of the specified binary operator |
| 359 | /// token. This returns: |
| 360 | /// ~0 - Invalid token. |
Chris Lattner | 9e66ba6 | 2008-05-05 04:10:51 +0000 | [diff] [blame] | 361 | /// 14 -> 3 - various operators. |
| 362 | /// 0 - 'eom' or ')' |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 363 | static unsigned getPrecedence(tok::TokenKind Kind) { |
| 364 | switch (Kind) { |
| 365 | default: return ~0U; |
| 366 | case tok::percent: |
| 367 | case tok::slash: |
| 368 | case tok::star: return 14; |
| 369 | case tok::plus: |
| 370 | case tok::minus: return 13; |
| 371 | case tok::lessless: |
| 372 | case tok::greatergreater: return 12; |
| 373 | case tok::lessequal: |
| 374 | case tok::less: |
| 375 | case tok::greaterequal: |
| 376 | case tok::greater: return 11; |
| 377 | case tok::exclaimequal: |
| 378 | case tok::equalequal: return 10; |
| 379 | case tok::amp: return 9; |
| 380 | case tok::caret: return 8; |
| 381 | case tok::pipe: return 7; |
| 382 | case tok::ampamp: return 6; |
| 383 | case tok::pipepipe: return 5; |
Chris Lattner | 98ed49f | 2008-05-05 20:07:41 +0000 | [diff] [blame] | 384 | case tok::question: return 4; |
| 385 | case tok::comma: return 3; |
Chris Lattner | 9189156 | 2008-05-04 18:36:18 +0000 | [diff] [blame] | 386 | case tok::colon: return 2; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 387 | case tok::r_paren: return 0; // Lowest priority, end of expr. |
| 388 | case tok::eom: return 0; // Lowest priority, end of macro. |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | |
| 393 | /// EvaluateDirectiveSubExpr - Evaluate the subexpression whose first token is |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 394 | /// PeekTok, and whose precedence is PeekPrec. This returns the result in LHS. |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 395 | /// |
| 396 | /// If ValueLive is false, then this value is being evaluated in a context where |
| 397 | /// the result is not used. As such, avoid diagnostics that relate to |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 398 | /// evaluation, such as division by zero warnings. |
| 399 | static bool EvaluateDirectiveSubExpr(PPValue &LHS, unsigned MinPrec, |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 400 | Token &PeekTok, bool ValueLive, |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 401 | Preprocessor &PP) { |
| 402 | unsigned PeekPrec = getPrecedence(PeekTok.getKind()); |
| 403 | // If this token isn't valid, report the error. |
| 404 | if (PeekPrec == ~0U) { |
Chris Lattner | 204b2fe | 2008-11-18 21:48:13 +0000 | [diff] [blame] | 405 | PP.Diag(PeekTok.getLocation(), diag::err_pp_expr_bad_token_binop) |
| 406 | << LHS.getRange(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 407 | return true; |
| 408 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 409 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 410 | while (1) { |
| 411 | // If this token has a lower precedence than we are allowed to parse, return |
| 412 | // it so that higher levels of the recursion can parse it. |
| 413 | if (PeekPrec < MinPrec) |
| 414 | return false; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 415 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 416 | tok::TokenKind Operator = PeekTok.getKind(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 417 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 418 | // If this is a short-circuiting operator, see if the RHS of the operator is |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 419 | // dead. Note that this cannot just clobber ValueLive. Consider |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 420 | // "0 && 1 ? 4 : 1 / 0", which is parsed as "(0 && 1) ? 4 : (1 / 0)". In |
| 421 | // this example, the RHS of the && being dead does not make the rest of the |
| 422 | // expr dead. |
| 423 | bool RHSIsLive; |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 424 | if (Operator == tok::ampamp && LHS.Val == 0) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 425 | RHSIsLive = false; // RHS of "0 && x" is dead. |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 426 | else if (Operator == tok::pipepipe && LHS.Val != 0) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 427 | RHSIsLive = false; // RHS of "1 || x" is dead. |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 428 | else if (Operator == tok::question && LHS.Val == 0) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 429 | RHSIsLive = false; // RHS (x) of "0 ? x : y" is dead. |
| 430 | else |
| 431 | RHSIsLive = ValueLive; |
| 432 | |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 433 | // Consume the operator, remembering the operator's location for reporting. |
| 434 | SourceLocation OpLoc = PeekTok.getLocation(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 435 | PP.LexNonComment(PeekTok); |
| 436 | |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 437 | PPValue RHS(LHS.getBitWidth()); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 438 | // Parse the RHS of the operator. |
| 439 | DefinedTracker DT; |
| 440 | if (EvaluateValue(RHS, PeekTok, DT, RHSIsLive, PP)) return true; |
| 441 | |
| 442 | // Remember the precedence of this operator and get the precedence of the |
| 443 | // operator immediately to the right of the RHS. |
| 444 | unsigned ThisPrec = PeekPrec; |
| 445 | PeekPrec = getPrecedence(PeekTok.getKind()); |
| 446 | |
| 447 | // If this token isn't valid, report the error. |
| 448 | if (PeekPrec == ~0U) { |
Chris Lattner | 204b2fe | 2008-11-18 21:48:13 +0000 | [diff] [blame] | 449 | PP.Diag(PeekTok.getLocation(), diag::err_pp_expr_bad_token_binop) |
| 450 | << RHS.getRange(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 451 | return true; |
| 452 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 453 | |
Chris Lattner | 98ed49f | 2008-05-05 20:07:41 +0000 | [diff] [blame] | 454 | // Decide whether to include the next binop in this subexpression. For |
| 455 | // example, when parsing x+y*z and looking at '*', we want to recursively |
Chris Lattner | 44cbbb0 | 2008-05-05 20:09:27 +0000 | [diff] [blame] | 456 | // handle y*z as a single subexpression. We do this because the precedence |
| 457 | // of * is higher than that of +. The only strange case we have to handle |
| 458 | // here is for the ?: operator, where the precedence is actually lower than |
| 459 | // the LHS of the '?'. The grammar rule is: |
Chris Lattner | 98ed49f | 2008-05-05 20:07:41 +0000 | [diff] [blame] | 460 | // |
| 461 | // conditional-expression ::= |
| 462 | // logical-OR-expression ? expression : conditional-expression |
| 463 | // where 'expression' is actually comma-expression. |
| 464 | unsigned RHSPrec; |
| 465 | if (Operator == tok::question) |
| 466 | // The RHS of "?" should be maximally consumed as an expression. |
| 467 | RHSPrec = getPrecedence(tok::comma); |
| 468 | else // All others should munch while higher precedence. |
| 469 | RHSPrec = ThisPrec+1; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 470 | |
Chris Lattner | 98ed49f | 2008-05-05 20:07:41 +0000 | [diff] [blame] | 471 | if (PeekPrec >= RHSPrec) { |
| 472 | if (EvaluateDirectiveSubExpr(RHS, RHSPrec, PeekTok, RHSIsLive, PP)) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 473 | return true; |
| 474 | PeekPrec = getPrecedence(PeekTok.getKind()); |
| 475 | } |
| 476 | assert(PeekPrec <= ThisPrec && "Recursion didn't work!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 477 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 478 | // Usual arithmetic conversions (C99 6.3.1.8p1): result is unsigned if |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 479 | // either operand is unsigned. |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 480 | llvm::APSInt Res(LHS.getBitWidth()); |
Chris Lattner | 019ef7e | 2008-05-04 23:46:17 +0000 | [diff] [blame] | 481 | switch (Operator) { |
| 482 | case tok::question: // No UAC for x and y in "x ? y : z". |
| 483 | case tok::lessless: // Shift amount doesn't UAC with shift value. |
| 484 | case tok::greatergreater: // Shift amount doesn't UAC with shift value. |
| 485 | case tok::comma: // Comma operands are not subject to UACs. |
| 486 | case tok::pipepipe: // Logical || does not do UACs. |
| 487 | case tok::ampamp: // Logical && does not do UACs. |
| 488 | break; // No UAC |
| 489 | default: |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 490 | Res.setIsUnsigned(LHS.isUnsigned()|RHS.isUnsigned()); |
| 491 | // If this just promoted something from signed to unsigned, and if the |
| 492 | // value was negative, warn about it. |
| 493 | if (ValueLive && Res.isUnsigned()) { |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 494 | if (!LHS.isUnsigned() && LHS.Val.isNegative()) |
Chris Lattner | 204b2fe | 2008-11-18 21:48:13 +0000 | [diff] [blame] | 495 | PP.Diag(OpLoc, diag::warn_pp_convert_lhs_to_positive) |
| 496 | << LHS.Val.toString(10, true) + " to " + |
| 497 | LHS.Val.toString(10, false) |
| 498 | << LHS.getRange() << RHS.getRange(); |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 499 | if (!RHS.isUnsigned() && RHS.Val.isNegative()) |
Chris Lattner | 204b2fe | 2008-11-18 21:48:13 +0000 | [diff] [blame] | 500 | PP.Diag(OpLoc, diag::warn_pp_convert_rhs_to_positive) |
| 501 | << RHS.Val.toString(10, true) + " to " + |
| 502 | RHS.Val.toString(10, false) |
| 503 | << LHS.getRange() << RHS.getRange(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 504 | } |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 505 | LHS.Val.setIsUnsigned(Res.isUnsigned()); |
| 506 | RHS.Val.setIsUnsigned(Res.isUnsigned()); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 507 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 508 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 509 | // FIXME: All of these should detect and report overflow?? |
| 510 | bool Overflow = false; |
| 511 | switch (Operator) { |
| 512 | default: assert(0 && "Unknown operator token!"); |
| 513 | case tok::percent: |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 514 | if (RHS.Val != 0) |
| 515 | Res = LHS.Val % RHS.Val; |
| 516 | else if (ValueLive) { |
Chris Lattner | 204b2fe | 2008-11-18 21:48:13 +0000 | [diff] [blame] | 517 | PP.Diag(OpLoc, diag::err_pp_remainder_by_zero) |
| 518 | << LHS.getRange() << RHS.getRange(); |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 519 | return true; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 520 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 521 | break; |
| 522 | case tok::slash: |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 523 | if (RHS.Val != 0) { |
| 524 | Res = LHS.Val / RHS.Val; |
| 525 | if (LHS.Val.isSigned()) // MININT/-1 --> overflow. |
| 526 | Overflow = LHS.Val.isMinSignedValue() && RHS.Val.isAllOnesValue(); |
| 527 | } else if (ValueLive) { |
Chris Lattner | 204b2fe | 2008-11-18 21:48:13 +0000 | [diff] [blame] | 528 | PP.Diag(OpLoc, diag::err_pp_division_by_zero) |
| 529 | << LHS.getRange() << RHS.getRange(); |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 530 | return true; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 531 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 532 | break; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 533 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 534 | case tok::star: |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 535 | Res = LHS.Val * RHS.Val; |
Eli Friedman | 3265a42 | 2009-05-16 21:24:10 +0000 | [diff] [blame] | 536 | if (Res.isSigned() && LHS.Val != 0 && RHS.Val != 0) |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 537 | Overflow = Res/RHS.Val != LHS.Val || Res/LHS.Val != RHS.Val; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 538 | break; |
| 539 | case tok::lessless: { |
| 540 | // Determine whether overflow is about to happen. |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 541 | unsigned ShAmt = static_cast<unsigned>(RHS.Val.getLimitedValue()); |
| 542 | if (ShAmt >= LHS.Val.getBitWidth()) |
| 543 | Overflow = true, ShAmt = LHS.Val.getBitWidth()-1; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 544 | else if (LHS.isUnsigned()) |
Eli Friedman | 3265a42 | 2009-05-16 21:24:10 +0000 | [diff] [blame] | 545 | Overflow = false; |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 546 | else if (LHS.Val.isNonNegative()) // Don't allow sign change. |
| 547 | Overflow = ShAmt >= LHS.Val.countLeadingZeros(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 548 | else |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 549 | Overflow = ShAmt >= LHS.Val.countLeadingOnes(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 550 | |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 551 | Res = LHS.Val << ShAmt; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 552 | break; |
| 553 | } |
| 554 | case tok::greatergreater: { |
| 555 | // Determine whether overflow is about to happen. |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 556 | unsigned ShAmt = static_cast<unsigned>(RHS.Val.getLimitedValue()); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 557 | if (ShAmt >= LHS.getBitWidth()) |
| 558 | Overflow = true, ShAmt = LHS.getBitWidth()-1; |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 559 | Res = LHS.Val >> ShAmt; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 560 | break; |
| 561 | } |
| 562 | case tok::plus: |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 563 | Res = LHS.Val + RHS.Val; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 564 | if (LHS.isUnsigned()) |
Eli Friedman | 3265a42 | 2009-05-16 21:24:10 +0000 | [diff] [blame] | 565 | Overflow = false; |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 566 | else if (LHS.Val.isNonNegative() == RHS.Val.isNonNegative() && |
| 567 | Res.isNonNegative() != LHS.Val.isNonNegative()) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 568 | Overflow = true; // Overflow for signed addition. |
| 569 | break; |
| 570 | case tok::minus: |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 571 | Res = LHS.Val - RHS.Val; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 572 | if (LHS.isUnsigned()) |
Eli Friedman | 3265a42 | 2009-05-16 21:24:10 +0000 | [diff] [blame] | 573 | Overflow = false; |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 574 | else if (LHS.Val.isNonNegative() != RHS.Val.isNonNegative() && |
| 575 | Res.isNonNegative() != LHS.Val.isNonNegative()) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 576 | Overflow = true; // Overflow for signed subtraction. |
| 577 | break; |
| 578 | case tok::lessequal: |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 579 | Res = LHS.Val <= RHS.Val; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 580 | Res.setIsUnsigned(false); // C99 6.5.8p6, result is always int (signed) |
| 581 | break; |
| 582 | case tok::less: |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 583 | Res = LHS.Val < RHS.Val; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 584 | Res.setIsUnsigned(false); // C99 6.5.8p6, result is always int (signed) |
| 585 | break; |
| 586 | case tok::greaterequal: |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 587 | Res = LHS.Val >= RHS.Val; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 588 | Res.setIsUnsigned(false); // C99 6.5.8p6, result is always int (signed) |
| 589 | break; |
| 590 | case tok::greater: |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 591 | Res = LHS.Val > RHS.Val; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 592 | Res.setIsUnsigned(false); // C99 6.5.8p6, result is always int (signed) |
| 593 | break; |
| 594 | case tok::exclaimequal: |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 595 | Res = LHS.Val != RHS.Val; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 596 | Res.setIsUnsigned(false); // C99 6.5.9p3, result is always int (signed) |
| 597 | break; |
| 598 | case tok::equalequal: |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 599 | Res = LHS.Val == RHS.Val; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 600 | Res.setIsUnsigned(false); // C99 6.5.9p3, result is always int (signed) |
| 601 | break; |
| 602 | case tok::amp: |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 603 | Res = LHS.Val & RHS.Val; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 604 | break; |
| 605 | case tok::caret: |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 606 | Res = LHS.Val ^ RHS.Val; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 607 | break; |
| 608 | case tok::pipe: |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 609 | Res = LHS.Val | RHS.Val; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 610 | break; |
| 611 | case tok::ampamp: |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 612 | Res = (LHS.Val != 0 && RHS.Val != 0); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 613 | Res.setIsUnsigned(false); // C99 6.5.13p3, result is always int (signed) |
| 614 | break; |
| 615 | case tok::pipepipe: |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 616 | Res = (LHS.Val != 0 || RHS.Val != 0); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 617 | Res.setIsUnsigned(false); // C99 6.5.14p3, result is always int (signed) |
| 618 | break; |
| 619 | case tok::comma: |
Chris Lattner | 9189156 | 2008-05-04 18:36:18 +0000 | [diff] [blame] | 620 | // Comma is invalid in pp expressions in c89/c++ mode, but is valid in C99 |
| 621 | // if not being evaluated. |
| 622 | if (!PP.getLangOptions().C99 || ValueLive) |
Chris Lattner | 204b2fe | 2008-11-18 21:48:13 +0000 | [diff] [blame] | 623 | PP.Diag(OpLoc, diag::ext_pp_comma_expr) |
| 624 | << LHS.getRange() << RHS.getRange(); |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 625 | Res = RHS.Val; // LHS = LHS,RHS -> RHS. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 626 | break; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 627 | case tok::question: { |
| 628 | // Parse the : part of the expression. |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 629 | if (PeekTok.isNot(tok::colon)) { |
Chris Lattner | 204b2fe | 2008-11-18 21:48:13 +0000 | [diff] [blame] | 630 | PP.Diag(PeekTok.getLocation(), diag::err_expected_colon) |
| 631 | << LHS.getRange(), RHS.getRange(); |
Chris Lattner | 28eb7e9 | 2008-11-23 23:17:07 +0000 | [diff] [blame] | 632 | PP.Diag(OpLoc, diag::note_matching) << "?"; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 633 | return true; |
| 634 | } |
| 635 | // Consume the :. |
| 636 | PP.LexNonComment(PeekTok); |
| 637 | |
| 638 | // Evaluate the value after the :. |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 639 | bool AfterColonLive = ValueLive && LHS.Val == 0; |
| 640 | PPValue AfterColonVal(LHS.getBitWidth()); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 641 | DefinedTracker DT; |
| 642 | if (EvaluateValue(AfterColonVal, PeekTok, DT, AfterColonLive, PP)) |
| 643 | return true; |
| 644 | |
Chris Lattner | 44cbbb0 | 2008-05-05 20:09:27 +0000 | [diff] [blame] | 645 | // Parse anything after the : with the same precedence as ?. We allow |
| 646 | // things of equal precedence because ?: is right associative. |
Chris Lattner | 98ed49f | 2008-05-05 20:07:41 +0000 | [diff] [blame] | 647 | if (EvaluateDirectiveSubExpr(AfterColonVal, ThisPrec, |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 648 | PeekTok, AfterColonLive, PP)) |
| 649 | return true; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 650 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 651 | // Now that we have the condition, the LHS and the RHS of the :, evaluate. |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 652 | Res = LHS.Val != 0 ? RHS.Val : AfterColonVal.Val; |
| 653 | RHS.setEnd(AfterColonVal.getRange().getEnd()); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 654 | |
| 655 | // Usual arithmetic conversions (C99 6.3.1.8p1): result is unsigned if |
| 656 | // either operand is unsigned. |
| 657 | Res.setIsUnsigned(RHS.isUnsigned() | AfterColonVal.isUnsigned()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 658 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 659 | // Figure out the precedence of the token after the : part. |
| 660 | PeekPrec = getPrecedence(PeekTok.getKind()); |
| 661 | break; |
| 662 | } |
| 663 | case tok::colon: |
| 664 | // Don't allow :'s to float around without being part of ?: exprs. |
Chris Lattner | 204b2fe | 2008-11-18 21:48:13 +0000 | [diff] [blame] | 665 | PP.Diag(OpLoc, diag::err_pp_colon_without_question) |
| 666 | << LHS.getRange() << RHS.getRange(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 667 | return true; |
| 668 | } |
| 669 | |
| 670 | // If this operator is live and overflowed, report the issue. |
| 671 | if (Overflow && ValueLive) |
Chris Lattner | 204b2fe | 2008-11-18 21:48:13 +0000 | [diff] [blame] | 672 | PP.Diag(OpLoc, diag::warn_pp_expr_overflow) |
| 673 | << LHS.getRange() << RHS.getRange(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 674 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 675 | // Put the result back into 'LHS' for our next iteration. |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 676 | LHS.Val = Res; |
| 677 | LHS.setEnd(RHS.getRange().getEnd()); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 678 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 679 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 680 | return false; |
| 681 | } |
| 682 | |
| 683 | /// EvaluateDirectiveExpression - Evaluate an integer constant expression that |
| 684 | /// may occur after a #if or #elif directive. If the expression is equivalent |
| 685 | /// to "!defined(X)" return X in IfNDefMacro. |
| 686 | bool Preprocessor:: |
| 687 | EvaluateDirectiveExpression(IdentifierInfo *&IfNDefMacro) { |
Chris Lattner | a3e008a | 2009-12-14 05:00:18 +0000 | [diff] [blame] | 688 | // Save the current state of 'DisableMacroExpansion' and reset it to false. If |
| 689 | // 'DisableMacroExpansion' is true, then we must be in a macro argument list |
| 690 | // in which case a directive is undefined behavior. We want macros to be able |
| 691 | // to recursively expand in order to get more gcc-list behavior, so we force |
| 692 | // DisableMacroExpansion to false and restore it when we're done parsing the |
| 693 | // expression. |
| 694 | bool DisableMacroExpansionAtStartOfDirective = DisableMacroExpansion; |
| 695 | DisableMacroExpansion = false; |
| 696 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 697 | // Peek ahead one token. |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 698 | Token Tok; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 699 | Lex(Tok); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 700 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 701 | // C99 6.10.1p3 - All expressions are evaluated as intmax_t or uintmax_t. |
Chris Lattner | 98be494 | 2008-03-05 18:54:05 +0000 | [diff] [blame] | 702 | unsigned BitWidth = getTargetInfo().getIntMaxTWidth(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 703 | |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 704 | PPValue ResVal(BitWidth); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 705 | DefinedTracker DT; |
| 706 | if (EvaluateValue(ResVal, Tok, DT, true, *this)) { |
| 707 | // Parse error, skip the rest of the macro line. |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 708 | if (Tok.isNot(tok::eom)) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 709 | DiscardUntilEndOfDirective(); |
Chris Lattner | a3e008a | 2009-12-14 05:00:18 +0000 | [diff] [blame] | 710 | |
| 711 | // Restore 'DisableMacroExpansion'. |
| 712 | DisableMacroExpansion = DisableMacroExpansionAtStartOfDirective; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 713 | return false; |
| 714 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 715 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 716 | // If we are at the end of the expression after just parsing a value, there |
| 717 | // must be no (unparenthesized) binary operators involved, so we can exit |
| 718 | // directly. |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 719 | if (Tok.is(tok::eom)) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 720 | // If the expression we parsed was of the form !defined(macro), return the |
| 721 | // macro in IfNDefMacro. |
| 722 | if (DT.State == DefinedTracker::NotDefinedMacro) |
| 723 | IfNDefMacro = DT.TheMacro; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 724 | |
Chris Lattner | a3e008a | 2009-12-14 05:00:18 +0000 | [diff] [blame] | 725 | // Restore 'DisableMacroExpansion'. |
| 726 | DisableMacroExpansion = DisableMacroExpansionAtStartOfDirective; |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 727 | return ResVal.Val != 0; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 728 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 729 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 730 | // Otherwise, we must have a binary operator (e.g. "#if 1 < 2"), so parse the |
| 731 | // operator and the stuff after it. |
Chris Lattner | 98ed49f | 2008-05-05 20:07:41 +0000 | [diff] [blame] | 732 | if (EvaluateDirectiveSubExpr(ResVal, getPrecedence(tok::question), |
| 733 | Tok, true, *this)) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 734 | // Parse error, skip the rest of the macro line. |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 735 | if (Tok.isNot(tok::eom)) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 736 | DiscardUntilEndOfDirective(); |
Chris Lattner | a3e008a | 2009-12-14 05:00:18 +0000 | [diff] [blame] | 737 | |
| 738 | // Restore 'DisableMacroExpansion'. |
| 739 | DisableMacroExpansion = DisableMacroExpansionAtStartOfDirective; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 740 | return false; |
| 741 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 742 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 743 | // If we aren't at the tok::eom token, something bad happened, like an extra |
| 744 | // ')' token. |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 745 | if (Tok.isNot(tok::eom)) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 746 | Diag(Tok, diag::err_pp_expected_eol); |
| 747 | DiscardUntilEndOfDirective(); |
| 748 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 749 | |
Chris Lattner | a3e008a | 2009-12-14 05:00:18 +0000 | [diff] [blame] | 750 | // Restore 'DisableMacroExpansion'. |
| 751 | DisableMacroExpansion = DisableMacroExpansionAtStartOfDirective; |
Chris Lattner | 8ed3044 | 2008-05-05 06:45:50 +0000 | [diff] [blame] | 752 | return ResVal.Val != 0; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 753 | } |
| 754 | |