PPExpressions.cpp revision 5cee1195584fa8672253139c86e922daeda69b9e
15f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===--- PPExpressions.cpp - Preprocessor Expression Evaluation -----------===// 25f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 35f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// The LLVM Compiler Infrastructure 45f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 50bc735ffcfb223c0186419547abaa5c84482663eChris Lattner// This file is distributed under the University of Illinois Open Source 60bc735ffcfb223c0186419547abaa5c84482663eChris Lattner// License. See LICENSE.TXT for details. 75f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 85f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 95f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// This file implements the Preprocessor::EvaluateDirectiveExpression method, 115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// which parses and evaluates integer constant expressions for #if directives. 125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// FIXME: implement testing for #assert's. 165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "clang/Lex/Preprocessor.h" 205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "clang/Lex/MacroInfo.h" 215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "clang/Lex/LiteralSupport.h" 221fbb447e9d43c2c676e94081fbfee7eb6cbe933bDouglas Gregor#include "clang/Lex/CodeCompletionHandler.h" 235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "clang/Basic/TargetInfo.h" 24500d3297d2a21edeac4d46cbcbe21bc2352c2a28Chris Lattner#include "clang/Lex/LexDiagnostic.h" 255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "llvm/ADT/APSInt.h" 265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerusing namespace clang; 275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 283c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmannamespace { 293c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 308ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner/// PPValue - Represents the value of a subexpression of a preprocessor 318ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner/// conditional and the source range covered by it. 328ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattnerclass PPValue { 338ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner SourceRange Range; 348ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattnerpublic: 358ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner llvm::APSInt Val; 361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 378ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner // Default ctor - Construct an 'invalid' PPValue. 388ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner PPValue(unsigned BitWidth) : Val(BitWidth) {} 391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 408ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner unsigned getBitWidth() const { return Val.getBitWidth(); } 418ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner bool isUnsigned() const { return Val.isUnsigned(); } 421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 438ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner const SourceRange &getRange() const { return Range; } 441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 458ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner void setRange(SourceLocation L) { Range.setBegin(L); Range.setEnd(L); } 468ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner void setRange(SourceLocation B, SourceLocation E) { 471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Range.setBegin(B); Range.setEnd(E); 488ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner } 498ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner void setBegin(SourceLocation L) { Range.setBegin(L); } 508ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner void setEnd(SourceLocation L) { Range.setEnd(L); } 518ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner}; 528ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner 533c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman} 543c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 558ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattnerstatic bool EvaluateDirectiveSubExpr(PPValue &LHS, unsigned MinPrec, 56d217773f106856a11879ec79dc468efefaf2ee75Chris Lattner Token &PeekTok, bool ValueLive, 575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Preprocessor &PP); 585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// DefinedTracker - This struct is used while parsing expressions to keep track 605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// of whether !defined(X) has been seen. 615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// With this simple scheme, we handle the basic forms: 635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// !defined(X) and !defined X 645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// but we also trivially handle (silly) stuff like: 655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// !!!defined(X) and +!defined(X) and !+!+!defined(X) and !(defined(X)). 665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerstruct DefinedTracker { 675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer /// Each time a Value is evaluated, it returns information about whether the 685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer /// parsed value is of the form defined(X), !defined(X) or is something else. 695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer enum TrackerState { 705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DefinedMacro, // defined(X) 715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer NotDefinedMacro, // !defined(X) 725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Unknown // Something else. 735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } State; 745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer /// TheMacro - When the state is DefinedMacro or NotDefinedMacro, this 755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer /// indicates the macro that was checked. 765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer IdentifierInfo *TheMacro; 775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer}; 785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 79a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson/// EvaluateDefined - Process a 'defined(sym)' expression. 80a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattnerstatic bool EvaluateDefined(PPValue &Result, Token &PeekTok, DefinedTracker &DT, 81a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner bool ValueLive, Preprocessor &PP) { 82a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson IdentifierInfo *II; 83a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson Result.setBegin(PeekTok.getLocation()); 84a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson 85a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson // Get the next token, don't expand it. 86a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson PP.LexUnexpandedToken(PeekTok); 87a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson 88a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson // Two options, it can either be a pp-identifier or a (. 89a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson SourceLocation LParenLoc; 90a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson if (PeekTok.is(tok::l_paren)) { 91a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson // Found a paren, remember we saw it and skip it. 92a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson LParenLoc = PeekTok.getLocation(); 93a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson PP.LexUnexpandedToken(PeekTok); 94a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson } 95a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson 961fbb447e9d43c2c676e94081fbfee7eb6cbe933bDouglas Gregor if (PeekTok.is(tok::code_completion)) { 971fbb447e9d43c2c676e94081fbfee7eb6cbe933bDouglas Gregor if (PP.getCodeCompletionHandler()) 981fbb447e9d43c2c676e94081fbfee7eb6cbe933bDouglas Gregor PP.getCodeCompletionHandler()->CodeCompleteMacroName(false); 991fbb447e9d43c2c676e94081fbfee7eb6cbe933bDouglas Gregor PP.LexUnexpandedToken(PeekTok); 1001fbb447e9d43c2c676e94081fbfee7eb6cbe933bDouglas Gregor } 1011fbb447e9d43c2c676e94081fbfee7eb6cbe933bDouglas Gregor 102a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson // If we don't have a pp-identifier now, this is an error. 103a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson if ((II = PeekTok.getIdentifierInfo()) == 0) { 104a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson PP.Diag(PeekTok, diag::err_pp_defined_requires_identifier); 105a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson return true; 106a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson } 107a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson 108a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson // Otherwise, we got an identifier, is it defined to something? 109a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson Result.Val = II->hasMacroDefinition(); 110a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson Result.Val.setIsUnsigned(false); // Result is signed intmax_t. 111a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson 112a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson // If there is a macro, mark it used. 113a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson if (Result.Val != 0 && ValueLive) { 114a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson MacroInfo *Macro = PP.getMacroInfo(II); 1150827408865e32789e0ec4b8113a302ccdc531423Argyrios Kyrtzidis PP.markMacroAsUsed(Macro); 116a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson } 117a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson 118a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson // Consume identifier. 119a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson Result.setEnd(PeekTok.getLocation()); 12019943151b8d01768b42218ae36189aecd41951b0Chris Lattner PP.LexUnexpandedToken(PeekTok); 121a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson 122a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson // If we are in parens, ensure we have a trailing ). 123a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson if (LParenLoc.isValid()) { 124a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson if (PeekTok.isNot(tok::r_paren)) { 125a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson PP.Diag(PeekTok.getLocation(), diag::err_pp_missing_rparen) << "defined"; 126a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson PP.Diag(LParenLoc, diag::note_matching) << "("; 127a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson return true; 128a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson } 129a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson // Consume the ). 130a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson Result.setEnd(PeekTok.getLocation()); 131a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson PP.LexNonComment(PeekTok); 132a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson } 133a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson 134a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson // Success, remember that we saw defined(X). 135a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson DT.State = DefinedTracker::DefinedMacro; 136a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson DT.TheMacro = II; 137a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson return false; 138a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson} 139a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson 1405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// EvaluateValue - Evaluate the token PeekTok (and any others needed) and 1415f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// return the computed value in Result. Return true if there was an error 1425f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// parsing. This function also returns information about the form of the 1435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// expression in DT. See above for information on what DT means. 1445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 1455f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// If ValueLive is false, then this value is being evaluated in a context where 1465f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// the result is not used. As such, avoid diagnostics that relate to 1475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// evaluation. 1488ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattnerstatic bool EvaluateValue(PPValue &Result, Token &PeekTok, DefinedTracker &DT, 1498ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner bool ValueLive, Preprocessor &PP) { 1505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DT.State = DefinedTracker::Unknown; 1511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 152f29c5233085a5af795c3c01b94d319e5b3235d56Douglas Gregor if (PeekTok.is(tok::code_completion)) { 153f29c5233085a5af795c3c01b94d319e5b3235d56Douglas Gregor if (PP.getCodeCompletionHandler()) 154f29c5233085a5af795c3c01b94d319e5b3235d56Douglas Gregor PP.getCodeCompletionHandler()->CodeCompletePreprocessorExpression(); 155f29c5233085a5af795c3c01b94d319e5b3235d56Douglas Gregor PP.LexUnexpandedToken(PeekTok); 156f29c5233085a5af795c3c01b94d319e5b3235d56Douglas Gregor } 157f29c5233085a5af795c3c01b94d319e5b3235d56Douglas Gregor 1585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this token's spelling is a pp-identifier, check to see if it is 1595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // 'defined' or if it is a macro. Note that we check here because many 1605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // keywords are pp-identifiers, so we can't check the kind. 1615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (IdentifierInfo *II = PeekTok.getIdentifierInfo()) { 162f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner // Handle "defined X" and "defined(X)". 163f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner if (II->isStr("defined")) 164a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson return(EvaluateDefined(Result, PeekTok, DT, ValueLive, PP)); 165f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner 166f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner // If this identifier isn't 'defined' or one of the special 167f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner // preprocessor keywords and it wasn't macro expanded, it turns 168f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner // into a simple 0, unless it is the C++ keyword "true", in which case it 169f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner // turns into "1". 170f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner if (ValueLive) 171f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner PP.Diag(PeekTok, diag::warn_pp_undef_identifier) << II; 172f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner Result.Val = II->getTokenID() == tok::kw_true; 173f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner Result.Val.setIsUnsigned(false); // "0" is signed intmax_t 0. 174f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner Result.setRange(PeekTok.getLocation()); 175f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner PP.LexNonComment(PeekTok); 176f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner return false; 1775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer switch (PeekTok.getKind()) { 1805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer default: // Non-value token. 181d98d975ccdce7ec442ac26f682404cb71df40ff8Chris Lattner PP.Diag(PeekTok, diag::err_pp_expr_bad_token_start_expr); 1825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 18384021556baceb76eedf7d44be8ba71d9b8cfaccePeter Collingbourne case tok::eod: 1845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::r_paren: 1855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If there is no expression, report and exit. 1865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.Diag(PeekTok, diag::err_pp_expected_value_in_expr); 1875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 1885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::numeric_constant: { 1895f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::SmallString<64> IntegerBuffer; 19050f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor bool NumberInvalid = false; 1915f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef Spelling = PP.getSpelling(PeekTok, IntegerBuffer, 19250f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor &NumberInvalid); 19350f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor if (NumberInvalid) 19450f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor return true; // a diagnostic was already reported 19550f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor 196aeb863c3b4f1b1f38a524d21570c17aa8fd9e9c9Benjamin Kramer NumericLiteralParser Literal(Spelling.begin(), Spelling.end(), 1975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PeekTok.getLocation(), PP); 1985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (Literal.hadError) 1995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; // a diagnostic was already reported. 2001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2016e400c286b485e28d04a742ea87860ddfefa672eChris Lattner if (Literal.isFloatingLiteral() || Literal.isImaginary) { 2025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.Diag(PeekTok, diag::err_pp_illegal_floating_literal); 2035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 2045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(Literal.isIntegerLiteral() && "Unknown ppnumber"); 2065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 207b94495155dd551ee81ad0c1865acd9ff1bbd632dNeil Booth // long long is a C99 feature. 208b94495155dd551ee81ad0c1865acd9ff1bbd632dNeil Booth if (!PP.getLangOptions().C99 && !PP.getLangOptions().CPlusPlus0x 20979859c3ce1040e07ffed8f3a17dff33b739c8f11Neil Booth && Literal.isLongLong) 210b94495155dd551ee81ad0c1865acd9ff1bbd632dNeil Booth PP.Diag(PeekTok, diag::ext_longlong); 211b94495155dd551ee81ad0c1865acd9ff1bbd632dNeil Booth 2125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Parse the integer literal into Result. 2138ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner if (Literal.GetIntegerValue(Result.Val)) { 2145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Overflow parsing integer literal. 2155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (ValueLive) PP.Diag(PeekTok, diag::warn_integer_too_large); 2168ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.Val.setIsUnsigned(true); 2175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else { 2185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Set the signedness of the result to match whether there was a U suffix 2195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // or not. 2208ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.Val.setIsUnsigned(Literal.isUnsigned); 2211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Detect overflow based on whether the value is signed. If signed 2235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // and if the value is too large, emit a warning "integer constant is so 2245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // large that it is unsigned" e.g. on 12345678901234567890 where intmax_t 2255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // is 64-bits. 2268ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner if (!Literal.isUnsigned && Result.Val.isNegative()) { 227b081a350b5cad21e5cbea74c618701e8b839c4f6Chris Lattner // Don't warn for a hex literal: 0x8000..0 shouldn't warn. 228b081a350b5cad21e5cbea74c618701e8b839c4f6Chris Lattner if (ValueLive && Literal.getRadix() != 16) 2298ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner PP.Diag(PeekTok, diag::warn_integer_too_large_for_signed); 2308ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.Val.setIsUnsigned(true); 2315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Consume the token. 2358ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.setRange(PeekTok.getLocation()); 2365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.LexNonComment(PeekTok); 2375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return false; 2385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2395cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor case tok::char_constant: // 'x' 2405cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor case tok::wide_char_constant: { // L'x' 2415cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor case tok::utf16_char_constant: // u'x' 2425cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor case tok::utf32_char_constant: // U'x' 2435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::SmallString<32> CharBuffer; 24450f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor bool CharInvalid = false; 2455f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef ThisTok = PP.getSpelling(PeekTok, CharBuffer, &CharInvalid); 24650f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor if (CharInvalid) 24750f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor return true; 248ddeea5644367c9c153c9fee9e51bdea85ce43cbdBenjamin Kramer 249ddeea5644367c9c153c9fee9e51bdea85ce43cbdBenjamin Kramer CharLiteralParser Literal(ThisTok.begin(), ThisTok.end(), 2505cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor PeekTok.getLocation(), PP, PeekTok.getKind()); 2515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (Literal.hadError()) 2525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; // A diagnostic was already emitted. 2535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Character literals are always int or wchar_t, expand to intmax_t. 255444be7366d0a1e172c0290a1ea54c1cb16b5947cDaniel Dunbar const TargetInfo &TI = PP.getTargetInfo(); 2562a1c363f38e59a5044fc349aa7e538a50954c244Eli Friedman unsigned NumBits; 2572a1c363f38e59a5044fc349aa7e538a50954c244Eli Friedman if (Literal.isMultiChar()) 2582a1c363f38e59a5044fc349aa7e538a50954c244Eli Friedman NumBits = TI.getIntWidth(); 259f5c209d23b20ada4a9b6235db50317239cbf6ae1Alisdair Meredith else if (Literal.isWide()) 260f5c209d23b20ada4a9b6235db50317239cbf6ae1Alisdair Meredith NumBits = TI.getWCharWidth(); 2615cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor else if (Literal.isUTF16()) 2625cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor NumBits = TI.getChar16Width(); 2635cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor else if (Literal.isUTF32()) 2645cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor NumBits = TI.getChar32Width(); 2652a1c363f38e59a5044fc349aa7e538a50954c244Eli Friedman else 266f5c209d23b20ada4a9b6235db50317239cbf6ae1Alisdair Meredith NumBits = TI.getCharWidth(); 2672a1c363f38e59a5044fc349aa7e538a50954c244Eli Friedman 2685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Set the width. 2695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::APSInt Val(NumBits); 2705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Set the value. 2715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Val = Literal.getValue(); 2725cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor // Set the signedness. UTF-16 and UTF-32 are always unsigned 2735cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (!Literal.isUTF16() && !Literal.isUTF32()) 2745cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor Val.setIsUnsigned(!PP.getLangOptions().CharIsSigned); 2751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2768ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner if (Result.Val.getBitWidth() > Val.getBitWidth()) { 2778ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.Val = Val.extend(Result.Val.getBitWidth()); 2785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else { 2798ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner assert(Result.Val.getBitWidth() == Val.getBitWidth() && 2805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer "intmax_t smaller than char/wchar_t?"); 2818ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.Val = Val; 2825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Consume the token. 2858ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.setRange(PeekTok.getLocation()); 2865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.LexNonComment(PeekTok); 2875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return false; 2885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2898ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner case tok::l_paren: { 2908ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner SourceLocation Start = PeekTok.getLocation(); 2915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.LexNonComment(PeekTok); // Eat the (. 2925f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Parse the value and if there are any binary operators involved, parse 2935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // them. 2945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (EvaluateValue(Result, PeekTok, DT, ValueLive, PP)) return true; 2955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this is a silly value like (X), which doesn't need parens, check for 2975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // !(defined X). 29822f6bbcafa8871f4f20c4402d9cbc5c024fee99aChris Lattner if (PeekTok.is(tok::r_paren)) { 2995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Just use DT unmodified as our result. 3005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else { 3018ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner // Otherwise, we have something like (x+y), and we consumed '(x'. 3025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (EvaluateDirectiveSubExpr(Result, 1, PeekTok, ValueLive, PP)) 3035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 3041eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 30522f6bbcafa8871f4f20c4402d9cbc5c024fee99aChris Lattner if (PeekTok.isNot(tok::r_paren)) { 306204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(PeekTok.getLocation(), diag::err_pp_expected_rparen) 307204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << Result.getRange(); 30828eb7e992b9a266abb300da25b6d3c1557cec361Chris Lattner PP.Diag(Start, diag::note_matching) << "("; 3095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 3105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 3115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DT.State = DefinedTracker::Unknown; 3125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 3138ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.setRange(Start, PeekTok.getLocation()); 3145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.LexNonComment(PeekTok); // Eat the ). 3155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return false; 3168ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner } 3178ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner case tok::plus: { 3188ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner SourceLocation Start = PeekTok.getLocation(); 3195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Unary plus doesn't modify the value. 3205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.LexNonComment(PeekTok); 3218ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner if (EvaluateValue(Result, PeekTok, DT, ValueLive, PP)) return true; 3228ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.setBegin(Start); 3238ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner return false; 3248ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner } 3255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::minus: { 3265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer SourceLocation Loc = PeekTok.getLocation(); 3275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.LexNonComment(PeekTok); 3285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (EvaluateValue(Result, PeekTok, DT, ValueLive, PP)) return true; 3298ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.setBegin(Loc); 3301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.5.3.3p3: The sign of the result matches the sign of the operand. 3328ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.Val = -Result.Val; 3331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 334b081a350b5cad21e5cbea74c618701e8b839c4f6Chris Lattner // -MININT is the only thing that overflows. Unsigned never overflows. 335b081a350b5cad21e5cbea74c618701e8b839c4f6Chris Lattner bool Overflow = !Result.isUnsigned() && Result.Val.isMinSignedValue(); 3361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this operator is live and overflowed, report the issue. 3385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (Overflow && ValueLive) 339204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(Loc, diag::warn_pp_expr_overflow) << Result.getRange(); 3401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3415f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DT.State = DefinedTracker::Unknown; 3425f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return false; 3435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 3441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3458ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner case tok::tilde: { 3468ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner SourceLocation Start = PeekTok.getLocation(); 3475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.LexNonComment(PeekTok); 3485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (EvaluateValue(Result, PeekTok, DT, ValueLive, PP)) return true; 3498ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.setBegin(Start); 3508ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner 3515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.5.3.3p4: The sign of the result matches the sign of the operand. 3528ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.Val = ~Result.Val; 3535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DT.State = DefinedTracker::Unknown; 3545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return false; 3558ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner } 3561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3578ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner case tok::exclaim: { 3588ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner SourceLocation Start = PeekTok.getLocation(); 3595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.LexNonComment(PeekTok); 3605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (EvaluateValue(Result, PeekTok, DT, ValueLive, PP)) return true; 3618ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.setBegin(Start); 3628ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.Val = !Result.Val; 3635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.5.3.3p5: The sign of the result is 'int', aka it is signed. 3648ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.Val.setIsUnsigned(false); 3651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (DT.State == DefinedTracker::DefinedMacro) 3675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DT.State = DefinedTracker::NotDefinedMacro; 3685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer else if (DT.State == DefinedTracker::NotDefinedMacro) 3695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DT.State = DefinedTracker::DefinedMacro; 3705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return false; 3718ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner } 3721eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // FIXME: Handle #assert 3745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 3755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 3765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// getPrecedence - Return the precedence of the specified binary operator 3805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// token. This returns: 3815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// ~0 - Invalid token. 3829e66ba6d1c1c0e11b261e3b20ff02b999621021aChris Lattner/// 14 -> 3 - various operators. 38384021556baceb76eedf7d44be8ba71d9b8cfaccePeter Collingbourne/// 0 - 'eod' or ')' 3845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerstatic unsigned getPrecedence(tok::TokenKind Kind) { 3855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer switch (Kind) { 3865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer default: return ~0U; 3875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::percent: 3885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::slash: 3895f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::star: return 14; 3905f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::plus: 3915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::minus: return 13; 3925f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::lessless: 3935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::greatergreater: return 12; 3945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::lessequal: 3955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::less: 3965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::greaterequal: 3975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::greater: return 11; 3985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::exclaimequal: 3995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::equalequal: return 10; 4005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::amp: return 9; 4015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::caret: return 8; 4025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::pipe: return 7; 4035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::ampamp: return 6; 4045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::pipepipe: return 5; 40598ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner case tok::question: return 4; 40698ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner case tok::comma: return 3; 4079189156429c06eea3f75cb01646e2afd78000f39Chris Lattner case tok::colon: return 2; 40884021556baceb76eedf7d44be8ba71d9b8cfaccePeter Collingbourne case tok::r_paren: return 0;// Lowest priority, end of expr. 40984021556baceb76eedf7d44be8ba71d9b8cfaccePeter Collingbourne case tok::eod: return 0;// Lowest priority, end of directive. 4105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 4115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 4125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 4135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 4145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// EvaluateDirectiveSubExpr - Evaluate the subexpression whose first token is 4158ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner/// PeekTok, and whose precedence is PeekPrec. This returns the result in LHS. 4165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 4175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// If ValueLive is false, then this value is being evaluated in a context where 4185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// the result is not used. As such, avoid diagnostics that relate to 4198ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner/// evaluation, such as division by zero warnings. 4208ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattnerstatic bool EvaluateDirectiveSubExpr(PPValue &LHS, unsigned MinPrec, 421d217773f106856a11879ec79dc468efefaf2ee75Chris Lattner Token &PeekTok, bool ValueLive, 4225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Preprocessor &PP) { 4235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer unsigned PeekPrec = getPrecedence(PeekTok.getKind()); 4245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this token isn't valid, report the error. 4255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (PeekPrec == ~0U) { 426204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(PeekTok.getLocation(), diag::err_pp_expr_bad_token_binop) 427204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << LHS.getRange(); 4285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 4295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 4301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer while (1) { 4325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this token has a lower precedence than we are allowed to parse, return 4335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // it so that higher levels of the recursion can parse it. 4345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (PeekPrec < MinPrec) 4355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return false; 4361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer tok::TokenKind Operator = PeekTok.getKind(); 4381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this is a short-circuiting operator, see if the RHS of the operator is 4401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // dead. Note that this cannot just clobber ValueLive. Consider 4415f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // "0 && 1 ? 4 : 1 / 0", which is parsed as "(0 && 1) ? 4 : (1 / 0)". In 4425f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // this example, the RHS of the && being dead does not make the rest of the 4435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // expr dead. 4445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer bool RHSIsLive; 4458ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner if (Operator == tok::ampamp && LHS.Val == 0) 4465f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer RHSIsLive = false; // RHS of "0 && x" is dead. 4478ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner else if (Operator == tok::pipepipe && LHS.Val != 0) 4485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer RHSIsLive = false; // RHS of "1 || x" is dead. 4498ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner else if (Operator == tok::question && LHS.Val == 0) 4505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer RHSIsLive = false; // RHS (x) of "0 ? x : y" is dead. 4515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer else 4525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer RHSIsLive = ValueLive; 4535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 4548ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner // Consume the operator, remembering the operator's location for reporting. 4558ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner SourceLocation OpLoc = PeekTok.getLocation(); 4565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.LexNonComment(PeekTok); 4575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 4588ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner PPValue RHS(LHS.getBitWidth()); 4595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Parse the RHS of the operator. 4605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DefinedTracker DT; 4615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (EvaluateValue(RHS, PeekTok, DT, RHSIsLive, PP)) return true; 4625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 4635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Remember the precedence of this operator and get the precedence of the 4645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // operator immediately to the right of the RHS. 4655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer unsigned ThisPrec = PeekPrec; 4665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PeekPrec = getPrecedence(PeekTok.getKind()); 4675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 4685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this token isn't valid, report the error. 4695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (PeekPrec == ~0U) { 470204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(PeekTok.getLocation(), diag::err_pp_expr_bad_token_binop) 471204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << RHS.getRange(); 4725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 4735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 4741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 47598ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner // Decide whether to include the next binop in this subexpression. For 47698ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner // example, when parsing x+y*z and looking at '*', we want to recursively 47744cbbb05f544c5ee171000b2abf905aa7dc5340dChris Lattner // handle y*z as a single subexpression. We do this because the precedence 47844cbbb05f544c5ee171000b2abf905aa7dc5340dChris Lattner // of * is higher than that of +. The only strange case we have to handle 47944cbbb05f544c5ee171000b2abf905aa7dc5340dChris Lattner // here is for the ?: operator, where the precedence is actually lower than 48044cbbb05f544c5ee171000b2abf905aa7dc5340dChris Lattner // the LHS of the '?'. The grammar rule is: 48198ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner // 48298ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner // conditional-expression ::= 48398ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner // logical-OR-expression ? expression : conditional-expression 48498ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner // where 'expression' is actually comma-expression. 48598ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner unsigned RHSPrec; 48698ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner if (Operator == tok::question) 48798ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner // The RHS of "?" should be maximally consumed as an expression. 48898ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner RHSPrec = getPrecedence(tok::comma); 48998ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner else // All others should munch while higher precedence. 49098ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner RHSPrec = ThisPrec+1; 4911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 49298ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner if (PeekPrec >= RHSPrec) { 49398ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner if (EvaluateDirectiveSubExpr(RHS, RHSPrec, PeekTok, RHSIsLive, PP)) 4945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 4955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PeekPrec = getPrecedence(PeekTok.getKind()); 4965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 4975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(PeekPrec <= ThisPrec && "Recursion didn't work!"); 4981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Usual arithmetic conversions (C99 6.3.1.8p1): result is unsigned if 5001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // either operand is unsigned. 5015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::APSInt Res(LHS.getBitWidth()); 502019ef7e1024562f9647d80ded7be8b8c1d23678aChris Lattner switch (Operator) { 503019ef7e1024562f9647d80ded7be8b8c1d23678aChris Lattner case tok::question: // No UAC for x and y in "x ? y : z". 504019ef7e1024562f9647d80ded7be8b8c1d23678aChris Lattner case tok::lessless: // Shift amount doesn't UAC with shift value. 505019ef7e1024562f9647d80ded7be8b8c1d23678aChris Lattner case tok::greatergreater: // Shift amount doesn't UAC with shift value. 506019ef7e1024562f9647d80ded7be8b8c1d23678aChris Lattner case tok::comma: // Comma operands are not subject to UACs. 507019ef7e1024562f9647d80ded7be8b8c1d23678aChris Lattner case tok::pipepipe: // Logical || does not do UACs. 508019ef7e1024562f9647d80ded7be8b8c1d23678aChris Lattner case tok::ampamp: // Logical && does not do UACs. 509019ef7e1024562f9647d80ded7be8b8c1d23678aChris Lattner break; // No UAC 510019ef7e1024562f9647d80ded7be8b8c1d23678aChris Lattner default: 5115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Res.setIsUnsigned(LHS.isUnsigned()|RHS.isUnsigned()); 5125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this just promoted something from signed to unsigned, and if the 5135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // value was negative, warn about it. 5145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (ValueLive && Res.isUnsigned()) { 5158ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner if (!LHS.isUnsigned() && LHS.Val.isNegative()) 516204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(OpLoc, diag::warn_pp_convert_lhs_to_positive) 517204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << LHS.Val.toString(10, true) + " to " + 518204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner LHS.Val.toString(10, false) 519204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << LHS.getRange() << RHS.getRange(); 5208ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner if (!RHS.isUnsigned() && RHS.Val.isNegative()) 521204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(OpLoc, diag::warn_pp_convert_rhs_to_positive) 522204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << RHS.Val.toString(10, true) + " to " + 523204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner RHS.Val.toString(10, false) 524204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << LHS.getRange() << RHS.getRange(); 5255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 5268ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner LHS.Val.setIsUnsigned(Res.isUnsigned()); 5278ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner RHS.Val.setIsUnsigned(Res.isUnsigned()); 5285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 5291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer bool Overflow = false; 5315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer switch (Operator) { 5325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer default: assert(0 && "Unknown operator token!"); 5335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::percent: 5348ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner if (RHS.Val != 0) 5358ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val % RHS.Val; 5368ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner else if (ValueLive) { 537204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(OpLoc, diag::err_pp_remainder_by_zero) 538204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << LHS.getRange() << RHS.getRange(); 5398ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner return true; 5405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 5415f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5425f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::slash: 5438ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner if (RHS.Val != 0) { 544f9e7734edef861597473f31e85f6b46347348c3bChris Lattner if (LHS.Val.isSigned()) 545f9e7734edef861597473f31e85f6b46347348c3bChris Lattner Res = llvm::APSInt(LHS.Val.sdiv_ov(RHS.Val, Overflow), false); 546f9e7734edef861597473f31e85f6b46347348c3bChris Lattner else 547f9e7734edef861597473f31e85f6b46347348c3bChris Lattner Res = LHS.Val / RHS.Val; 5488ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner } else if (ValueLive) { 549204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(OpLoc, diag::err_pp_division_by_zero) 550204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << LHS.getRange() << RHS.getRange(); 5518ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner return true; 5525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 5535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::star: 556f9e7734edef861597473f31e85f6b46347348c3bChris Lattner if (Res.isSigned()) 557f9e7734edef861597473f31e85f6b46347348c3bChris Lattner Res = llvm::APSInt(LHS.Val.smul_ov(RHS.Val, Overflow), false); 558f9e7734edef861597473f31e85f6b46347348c3bChris Lattner else 559f9e7734edef861597473f31e85f6b46347348c3bChris Lattner Res = LHS.Val * RHS.Val; 5605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::lessless: { 5625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Determine whether overflow is about to happen. 5638ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner unsigned ShAmt = static_cast<unsigned>(RHS.Val.getLimitedValue()); 564f9e7734edef861597473f31e85f6b46347348c3bChris Lattner if (LHS.isUnsigned()) { 565f9e7734edef861597473f31e85f6b46347348c3bChris Lattner Overflow = ShAmt >= LHS.Val.getBitWidth(); 566f9e7734edef861597473f31e85f6b46347348c3bChris Lattner if (Overflow) 567f9e7734edef861597473f31e85f6b46347348c3bChris Lattner ShAmt = LHS.Val.getBitWidth()-1; 568f9e7734edef861597473f31e85f6b46347348c3bChris Lattner Res = LHS.Val << ShAmt; 569f9e7734edef861597473f31e85f6b46347348c3bChris Lattner } else { 570f9e7734edef861597473f31e85f6b46347348c3bChris Lattner Res = llvm::APSInt(LHS.Val.sshl_ov(ShAmt, Overflow), false); 571f9e7734edef861597473f31e85f6b46347348c3bChris Lattner } 5725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 5745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::greatergreater: { 5755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Determine whether overflow is about to happen. 5768ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner unsigned ShAmt = static_cast<unsigned>(RHS.Val.getLimitedValue()); 5775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (ShAmt >= LHS.getBitWidth()) 5785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Overflow = true, ShAmt = LHS.getBitWidth()-1; 5798ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val >> ShAmt; 5805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 5825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::plus: 5835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (LHS.isUnsigned()) 584f9e7734edef861597473f31e85f6b46347348c3bChris Lattner Res = LHS.Val + RHS.Val; 585f9e7734edef861597473f31e85f6b46347348c3bChris Lattner else 586f9e7734edef861597473f31e85f6b46347348c3bChris Lattner Res = llvm::APSInt(LHS.Val.sadd_ov(RHS.Val, Overflow), false); 5875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::minus: 5895f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (LHS.isUnsigned()) 590f9e7734edef861597473f31e85f6b46347348c3bChris Lattner Res = LHS.Val - RHS.Val; 591f9e7734edef861597473f31e85f6b46347348c3bChris Lattner else 592f9e7734edef861597473f31e85f6b46347348c3bChris Lattner Res = llvm::APSInt(LHS.Val.ssub_ov(RHS.Val, Overflow), false); 5935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::lessequal: 5958ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val <= RHS.Val; 5965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Res.setIsUnsigned(false); // C99 6.5.8p6, result is always int (signed) 5975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::less: 5998ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val < RHS.Val; 6005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Res.setIsUnsigned(false); // C99 6.5.8p6, result is always int (signed) 6015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 6025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::greaterequal: 6038ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val >= RHS.Val; 6045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Res.setIsUnsigned(false); // C99 6.5.8p6, result is always int (signed) 6055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 6065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::greater: 6078ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val > RHS.Val; 6085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Res.setIsUnsigned(false); // C99 6.5.8p6, result is always int (signed) 6095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 6105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::exclaimequal: 6118ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val != RHS.Val; 6125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Res.setIsUnsigned(false); // C99 6.5.9p3, result is always int (signed) 6135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 6145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::equalequal: 6158ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val == RHS.Val; 6165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Res.setIsUnsigned(false); // C99 6.5.9p3, result is always int (signed) 6175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 6185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::amp: 6198ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val & RHS.Val; 6205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 6215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::caret: 6228ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val ^ RHS.Val; 6235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 6245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::pipe: 6258ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val | RHS.Val; 6265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 6275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::ampamp: 6288ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = (LHS.Val != 0 && RHS.Val != 0); 6295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Res.setIsUnsigned(false); // C99 6.5.13p3, result is always int (signed) 6305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 6315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::pipepipe: 6328ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = (LHS.Val != 0 || RHS.Val != 0); 6335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Res.setIsUnsigned(false); // C99 6.5.14p3, result is always int (signed) 6345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 6355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::comma: 6369189156429c06eea3f75cb01646e2afd78000f39Chris Lattner // Comma is invalid in pp expressions in c89/c++ mode, but is valid in C99 6379189156429c06eea3f75cb01646e2afd78000f39Chris Lattner // if not being evaluated. 6389189156429c06eea3f75cb01646e2afd78000f39Chris Lattner if (!PP.getLangOptions().C99 || ValueLive) 639204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(OpLoc, diag::ext_pp_comma_expr) 640204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << LHS.getRange() << RHS.getRange(); 6418ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = RHS.Val; // LHS = LHS,RHS -> RHS. 6421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump break; 6435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::question: { 6445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Parse the : part of the expression. 64522f6bbcafa8871f4f20c4402d9cbc5c024fee99aChris Lattner if (PeekTok.isNot(tok::colon)) { 646204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(PeekTok.getLocation(), diag::err_expected_colon) 647204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << LHS.getRange(), RHS.getRange(); 64828eb7e992b9a266abb300da25b6d3c1557cec361Chris Lattner PP.Diag(OpLoc, diag::note_matching) << "?"; 6495f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 6505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 6515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Consume the :. 6525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.LexNonComment(PeekTok); 6535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 6545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Evaluate the value after the :. 6558ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner bool AfterColonLive = ValueLive && LHS.Val == 0; 6568ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner PPValue AfterColonVal(LHS.getBitWidth()); 6575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DefinedTracker DT; 6585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (EvaluateValue(AfterColonVal, PeekTok, DT, AfterColonLive, PP)) 6595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 6605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 66144cbbb05f544c5ee171000b2abf905aa7dc5340dChris Lattner // Parse anything after the : with the same precedence as ?. We allow 66244cbbb05f544c5ee171000b2abf905aa7dc5340dChris Lattner // things of equal precedence because ?: is right associative. 66398ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner if (EvaluateDirectiveSubExpr(AfterColonVal, ThisPrec, 6645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PeekTok, AfterColonLive, PP)) 6655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 6661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Now that we have the condition, the LHS and the RHS of the :, evaluate. 6688ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val != 0 ? RHS.Val : AfterColonVal.Val; 6698ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner RHS.setEnd(AfterColonVal.getRange().getEnd()); 6705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 6715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Usual arithmetic conversions (C99 6.3.1.8p1): result is unsigned if 6725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // either operand is unsigned. 6735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Res.setIsUnsigned(RHS.isUnsigned() | AfterColonVal.isUnsigned()); 6741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Figure out the precedence of the token after the : part. 6765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PeekPrec = getPrecedence(PeekTok.getKind()); 6775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 6785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 6795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::colon: 6805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Don't allow :'s to float around without being part of ?: exprs. 681204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(OpLoc, diag::err_pp_colon_without_question) 682204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << LHS.getRange() << RHS.getRange(); 6835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 6845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 6855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 6865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this operator is live and overflowed, report the issue. 6875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (Overflow && ValueLive) 688204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(OpLoc, diag::warn_pp_expr_overflow) 689204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << LHS.getRange() << RHS.getRange(); 6901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Put the result back into 'LHS' for our next iteration. 6928ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner LHS.Val = Res; 6938ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner LHS.setEnd(RHS.getRange().getEnd()); 6945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 6951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return false; 6975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 6985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 6995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// EvaluateDirectiveExpression - Evaluate an integer constant expression that 7005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// may occur after a #if or #elif directive. If the expression is equivalent 7015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// to "!defined(X)" return X in IfNDefMacro. 7025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerbool Preprocessor:: 7035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid SpencerEvaluateDirectiveExpression(IdentifierInfo *&IfNDefMacro) { 704a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner // Save the current state of 'DisableMacroExpansion' and reset it to false. If 705a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner // 'DisableMacroExpansion' is true, then we must be in a macro argument list 706a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner // in which case a directive is undefined behavior. We want macros to be able 707a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner // to recursively expand in order to get more gcc-list behavior, so we force 708a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner // DisableMacroExpansion to false and restore it when we're done parsing the 709a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner // expression. 710a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner bool DisableMacroExpansionAtStartOfDirective = DisableMacroExpansion; 711a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner DisableMacroExpansion = false; 712a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner 7135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Peek ahead one token. 714d217773f106856a11879ec79dc468efefaf2ee75Chris Lattner Token Tok; 7155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Lex(Tok); 7161fbb447e9d43c2c676e94081fbfee7eb6cbe933bDouglas Gregor 7175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.10.1p3 - All expressions are evaluated as intmax_t or uintmax_t. 71898be4943e8dc4f3905629a7102668960873cf863Chris Lattner unsigned BitWidth = getTargetInfo().getIntMaxTWidth(); 7191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7208ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner PPValue ResVal(BitWidth); 7215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DefinedTracker DT; 7225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (EvaluateValue(ResVal, Tok, DT, true, *this)) { 7235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Parse error, skip the rest of the macro line. 72484021556baceb76eedf7d44be8ba71d9b8cfaccePeter Collingbourne if (Tok.isNot(tok::eod)) 7255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DiscardUntilEndOfDirective(); 726a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner 727a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner // Restore 'DisableMacroExpansion'. 728a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner DisableMacroExpansion = DisableMacroExpansionAtStartOfDirective; 7295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return false; 7305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 7311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If we are at the end of the expression after just parsing a value, there 7335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // must be no (unparenthesized) binary operators involved, so we can exit 7345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // directly. 73584021556baceb76eedf7d44be8ba71d9b8cfaccePeter Collingbourne if (Tok.is(tok::eod)) { 7365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If the expression we parsed was of the form !defined(macro), return the 7375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // macro in IfNDefMacro. 7385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (DT.State == DefinedTracker::NotDefinedMacro) 7395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer IfNDefMacro = DT.TheMacro; 7401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 741a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner // Restore 'DisableMacroExpansion'. 742a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner DisableMacroExpansion = DisableMacroExpansionAtStartOfDirective; 7438ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner return ResVal.Val != 0; 7445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 7451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7465f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, we must have a binary operator (e.g. "#if 1 < 2"), so parse the 7475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // operator and the stuff after it. 74898ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner if (EvaluateDirectiveSubExpr(ResVal, getPrecedence(tok::question), 74998ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner Tok, true, *this)) { 7505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Parse error, skip the rest of the macro line. 75184021556baceb76eedf7d44be8ba71d9b8cfaccePeter Collingbourne if (Tok.isNot(tok::eod)) 7525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DiscardUntilEndOfDirective(); 753a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner 754a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner // Restore 'DisableMacroExpansion'. 755a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner DisableMacroExpansion = DisableMacroExpansionAtStartOfDirective; 7565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return false; 7575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 7581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 75984021556baceb76eedf7d44be8ba71d9b8cfaccePeter Collingbourne // If we aren't at the tok::eod token, something bad happened, like an extra 7605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // ')' token. 76184021556baceb76eedf7d44be8ba71d9b8cfaccePeter Collingbourne if (Tok.isNot(tok::eod)) { 7625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Diag(Tok, diag::err_pp_expected_eol); 7635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DiscardUntilEndOfDirective(); 7645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 7651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 766a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner // Restore 'DisableMacroExpansion'. 767a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner DisableMacroExpansion = DisableMacroExpansionAtStartOfDirective; 7688ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner return ResVal.Val != 0; 7695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 771