PPExpressions.cpp revision a3e008abc51933d567303a1b4bd17e68c798f60e
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" 225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "clang/Basic/TargetInfo.h" 23500d3297d2a21edeac4d46cbcbe21bc2352c2a28Chris Lattner#include "clang/Lex/LexDiagnostic.h" 245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "llvm/ADT/APSInt.h" 255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerusing namespace clang; 265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 278ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner/// PPValue - Represents the value of a subexpression of a preprocessor 288ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner/// conditional and the source range covered by it. 298ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattnerclass PPValue { 308ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner SourceRange Range; 318ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattnerpublic: 328ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner llvm::APSInt Val; 331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 348ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner // Default ctor - Construct an 'invalid' PPValue. 358ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner PPValue(unsigned BitWidth) : Val(BitWidth) {} 361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 378ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner unsigned getBitWidth() const { return Val.getBitWidth(); } 388ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner bool isUnsigned() const { return Val.isUnsigned(); } 391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 408ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner const SourceRange &getRange() const { return Range; } 411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 428ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner void setRange(SourceLocation L) { Range.setBegin(L); Range.setEnd(L); } 438ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner void setRange(SourceLocation B, SourceLocation E) { 441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Range.setBegin(B); Range.setEnd(E); 458ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner } 468ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner void setBegin(SourceLocation L) { Range.setBegin(L); } 478ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner void setEnd(SourceLocation L) { Range.setEnd(L); } 488ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner}; 498ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner 508ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattnerstatic bool EvaluateDirectiveSubExpr(PPValue &LHS, unsigned MinPrec, 51d217773f106856a11879ec79dc468efefaf2ee75Chris Lattner Token &PeekTok, bool ValueLive, 525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Preprocessor &PP); 535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// DefinedTracker - This struct is used while parsing expressions to keep track 555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// of whether !defined(X) has been seen. 565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// With this simple scheme, we handle the basic forms: 585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// !defined(X) and !defined X 595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// but we also trivially handle (silly) stuff like: 605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// !!!defined(X) and +!defined(X) and !+!+!defined(X) and !(defined(X)). 615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerstruct DefinedTracker { 625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer /// Each time a Value is evaluated, it returns information about whether the 635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer /// parsed value is of the form defined(X), !defined(X) or is something else. 645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer enum TrackerState { 655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DefinedMacro, // defined(X) 665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer NotDefinedMacro, // !defined(X) 675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Unknown // Something else. 685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } State; 695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer /// TheMacro - When the state is DefinedMacro or NotDefinedMacro, this 705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer /// indicates the macro that was checked. 715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer IdentifierInfo *TheMacro; 725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer}; 735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 74a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson/// EvaluateDefined - Process a 'defined(sym)' expression. 75a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattnerstatic bool EvaluateDefined(PPValue &Result, Token &PeekTok, DefinedTracker &DT, 76a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner bool ValueLive, Preprocessor &PP) { 77a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson IdentifierInfo *II; 78a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson Result.setBegin(PeekTok.getLocation()); 79a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson 80a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson // Get the next token, don't expand it. 81a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson PP.LexUnexpandedToken(PeekTok); 82a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson 83a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson // Two options, it can either be a pp-identifier or a (. 84a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson SourceLocation LParenLoc; 85a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson if (PeekTok.is(tok::l_paren)) { 86a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson // Found a paren, remember we saw it and skip it. 87a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson LParenLoc = PeekTok.getLocation(); 88a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson PP.LexUnexpandedToken(PeekTok); 89a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson } 90a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson 91a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson // If we don't have a pp-identifier now, this is an error. 92a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson if ((II = PeekTok.getIdentifierInfo()) == 0) { 93a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson PP.Diag(PeekTok, diag::err_pp_defined_requires_identifier); 94a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson return true; 95a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson } 96a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson 97a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson // Otherwise, we got an identifier, is it defined to something? 98a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson Result.Val = II->hasMacroDefinition(); 99a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson Result.Val.setIsUnsigned(false); // Result is signed intmax_t. 100a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson 101a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson // If there is a macro, mark it used. 102a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson if (Result.Val != 0 && ValueLive) { 103a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson MacroInfo *Macro = PP.getMacroInfo(II); 104a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson Macro->setIsUsed(true); 105a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson } 106a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson 107a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson // Consume identifier. 108a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson Result.setEnd(PeekTok.getLocation()); 109a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson PP.LexNonComment(PeekTok); 110a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson 111a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson // If we are in parens, ensure we have a trailing ). 112a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson if (LParenLoc.isValid()) { 113a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson if (PeekTok.isNot(tok::r_paren)) { 114a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson PP.Diag(PeekTok.getLocation(), diag::err_pp_missing_rparen) << "defined"; 115a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson PP.Diag(LParenLoc, diag::note_matching) << "("; 116a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson return true; 117a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson } 118a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson // Consume the ). 119a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson Result.setEnd(PeekTok.getLocation()); 120a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson PP.LexNonComment(PeekTok); 121a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson } 122a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson 123a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson // Success, remember that we saw defined(X). 124a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson DT.State = DefinedTracker::DefinedMacro; 125a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson DT.TheMacro = II; 126a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson return false; 127a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson} 128a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson 1295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// EvaluateValue - Evaluate the token PeekTok (and any others needed) and 1305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// return the computed value in Result. Return true if there was an error 1315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// parsing. This function also returns information about the form of the 1325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// expression in DT. See above for information on what DT means. 1335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 1345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// If ValueLive is false, then this value is being evaluated in a context where 1355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// the result is not used. As such, avoid diagnostics that relate to 1365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// evaluation. 1378ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattnerstatic bool EvaluateValue(PPValue &Result, Token &PeekTok, DefinedTracker &DT, 1388ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner bool ValueLive, Preprocessor &PP) { 1395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DT.State = DefinedTracker::Unknown; 1401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1415f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this token's spelling is a pp-identifier, check to see if it is 1425f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // 'defined' or if it is a macro. Note that we check here because many 1435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // keywords are pp-identifiers, so we can't check the kind. 1445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (IdentifierInfo *II = PeekTok.getIdentifierInfo()) { 145f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner // Handle "defined X" and "defined(X)". 146f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner if (II->isStr("defined")) 147a28cc090f265d5bdaef9ebb24fb9d579928d3a18John Thompson return(EvaluateDefined(Result, PeekTok, DT, ValueLive, PP)); 148f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner 149f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner // If this identifier isn't 'defined' or one of the special 150f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner // preprocessor keywords and it wasn't macro expanded, it turns 151f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner // into a simple 0, unless it is the C++ keyword "true", in which case it 152f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner // turns into "1". 153f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner if (ValueLive) 154f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner PP.Diag(PeekTok, diag::warn_pp_undef_identifier) << II; 155f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner Result.Val = II->getTokenID() == tok::kw_true; 156f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner Result.Val.setIsUnsigned(false); // "0" is signed intmax_t 0. 157f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner Result.setRange(PeekTok.getLocation()); 158f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner PP.LexNonComment(PeekTok); 159f880662e5ee532616a6602bdb7c1be45d276af9dChris Lattner return false; 1605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer switch (PeekTok.getKind()) { 1635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer default: // Non-value token. 164d98d975ccdce7ec442ac26f682404cb71df40ff8Chris Lattner PP.Diag(PeekTok, diag::err_pp_expr_bad_token_start_expr); 1655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 1665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::eom: 1675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::r_paren: 1685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If there is no expression, report and exit. 1695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.Diag(PeekTok, diag::err_pp_expected_value_in_expr); 1705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 1715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::numeric_constant: { 1725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::SmallString<64> IntegerBuffer; 1735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer IntegerBuffer.resize(PeekTok.getLength()); 1745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer const char *ThisTokBegin = &IntegerBuffer[0]; 1755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer unsigned ActualLength = PP.getSpelling(PeekTok, ThisTokBegin); 1761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PeekTok.getLocation(), PP); 1785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (Literal.hadError) 1795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; // a diagnostic was already reported. 1801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1816e400c286b485e28d04a742ea87860ddfefa672eChris Lattner if (Literal.isFloatingLiteral() || Literal.isImaginary) { 1825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.Diag(PeekTok, diag::err_pp_illegal_floating_literal); 1835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 1845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(Literal.isIntegerLiteral() && "Unknown ppnumber"); 1865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 187b94495155dd551ee81ad0c1865acd9ff1bbd632dNeil Booth // long long is a C99 feature. 188b94495155dd551ee81ad0c1865acd9ff1bbd632dNeil Booth if (!PP.getLangOptions().C99 && !PP.getLangOptions().CPlusPlus0x 18979859c3ce1040e07ffed8f3a17dff33b739c8f11Neil Booth && Literal.isLongLong) 190b94495155dd551ee81ad0c1865acd9ff1bbd632dNeil Booth PP.Diag(PeekTok, diag::ext_longlong); 191b94495155dd551ee81ad0c1865acd9ff1bbd632dNeil Booth 1925f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Parse the integer literal into Result. 1938ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner if (Literal.GetIntegerValue(Result.Val)) { 1945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Overflow parsing integer literal. 1955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (ValueLive) PP.Diag(PeekTok, diag::warn_integer_too_large); 1968ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.Val.setIsUnsigned(true); 1975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else { 1985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Set the signedness of the result to match whether there was a U suffix 1995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // or not. 2008ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.Val.setIsUnsigned(Literal.isUnsigned); 2011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Detect overflow based on whether the value is signed. If signed 2035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // and if the value is too large, emit a warning "integer constant is so 2045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // large that it is unsigned" e.g. on 12345678901234567890 where intmax_t 2055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // is 64-bits. 2068ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner if (!Literal.isUnsigned && Result.Val.isNegative()) { 207b081a350b5cad21e5cbea74c618701e8b839c4f6Chris Lattner // Don't warn for a hex literal: 0x8000..0 shouldn't warn. 208b081a350b5cad21e5cbea74c618701e8b839c4f6Chris Lattner if (ValueLive && Literal.getRadix() != 16) 2098ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner PP.Diag(PeekTok, diag::warn_integer_too_large_for_signed); 2108ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.Val.setIsUnsigned(true); 2115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2131eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Consume the token. 2158ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.setRange(PeekTok.getLocation()); 2165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.LexNonComment(PeekTok); 2175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return false; 2185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::char_constant: { // 'x' 2205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::SmallString<32> CharBuffer; 2215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer CharBuffer.resize(PeekTok.getLength()); 2225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer const char *ThisTokBegin = &CharBuffer[0]; 2235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer unsigned ActualLength = PP.getSpelling(PeekTok, ThisTokBegin); 2241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 2255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PeekTok.getLocation(), PP); 2265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (Literal.hadError()) 2275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; // A diagnostic was already emitted. 2285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Character literals are always int or wchar_t, expand to intmax_t. 230444be7366d0a1e172c0290a1ea54c1cb16b5947cDaniel Dunbar const TargetInfo &TI = PP.getTargetInfo(); 2312a1c363f38e59a5044fc349aa7e538a50954c244Eli Friedman unsigned NumBits; 2322a1c363f38e59a5044fc349aa7e538a50954c244Eli Friedman if (Literal.isMultiChar()) 2332a1c363f38e59a5044fc349aa7e538a50954c244Eli Friedman NumBits = TI.getIntWidth(); 234f5c209d23b20ada4a9b6235db50317239cbf6ae1Alisdair Meredith else if (Literal.isWide()) 235f5c209d23b20ada4a9b6235db50317239cbf6ae1Alisdair Meredith NumBits = TI.getWCharWidth(); 2362a1c363f38e59a5044fc349aa7e538a50954c244Eli Friedman else 237f5c209d23b20ada4a9b6235db50317239cbf6ae1Alisdair Meredith NumBits = TI.getCharWidth(); 2382a1c363f38e59a5044fc349aa7e538a50954c244Eli Friedman 2395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Set the width. 2405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::APSInt Val(NumBits); 2415f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Set the value. 2425f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Val = Literal.getValue(); 2435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Set the signedness. 24415b91764d08e886391c865c4a444d7b51141c284Eli Friedman Val.setIsUnsigned(!PP.getLangOptions().CharIsSigned); 2451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2468ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner if (Result.Val.getBitWidth() > Val.getBitWidth()) { 2478ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.Val = Val.extend(Result.Val.getBitWidth()); 2485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else { 2498ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner assert(Result.Val.getBitWidth() == Val.getBitWidth() && 2505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer "intmax_t smaller than char/wchar_t?"); 2518ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.Val = Val; 2525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Consume the token. 2558ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.setRange(PeekTok.getLocation()); 2565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.LexNonComment(PeekTok); 2575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return false; 2585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2598ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner case tok::l_paren: { 2608ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner SourceLocation Start = PeekTok.getLocation(); 2615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.LexNonComment(PeekTok); // Eat the (. 2625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Parse the value and if there are any binary operators involved, parse 2635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // them. 2645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (EvaluateValue(Result, PeekTok, DT, ValueLive, PP)) return true; 2655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this is a silly value like (X), which doesn't need parens, check for 2675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // !(defined X). 26822f6bbcafa8871f4f20c4402d9cbc5c024fee99aChris Lattner if (PeekTok.is(tok::r_paren)) { 2695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Just use DT unmodified as our result. 2705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else { 2718ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner // Otherwise, we have something like (x+y), and we consumed '(x'. 2725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (EvaluateDirectiveSubExpr(Result, 1, PeekTok, ValueLive, PP)) 2735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 2741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 27522f6bbcafa8871f4f20c4402d9cbc5c024fee99aChris Lattner if (PeekTok.isNot(tok::r_paren)) { 276204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(PeekTok.getLocation(), diag::err_pp_expected_rparen) 277204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << Result.getRange(); 27828eb7e992b9a266abb300da25b6d3c1557cec361Chris Lattner PP.Diag(Start, diag::note_matching) << "("; 2795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 2805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DT.State = DefinedTracker::Unknown; 2825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2838ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.setRange(Start, PeekTok.getLocation()); 2845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.LexNonComment(PeekTok); // Eat the ). 2855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return false; 2868ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner } 2878ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner case tok::plus: { 2888ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner SourceLocation Start = PeekTok.getLocation(); 2895f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Unary plus doesn't modify the value. 2905f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.LexNonComment(PeekTok); 2918ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner if (EvaluateValue(Result, PeekTok, DT, ValueLive, PP)) return true; 2928ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.setBegin(Start); 2938ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner return false; 2948ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner } 2955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::minus: { 2965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer SourceLocation Loc = PeekTok.getLocation(); 2975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.LexNonComment(PeekTok); 2985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (EvaluateValue(Result, PeekTok, DT, ValueLive, PP)) return true; 2998ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.setBegin(Loc); 3001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.5.3.3p3: The sign of the result matches the sign of the operand. 3028ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.Val = -Result.Val; 3031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 304b081a350b5cad21e5cbea74c618701e8b839c4f6Chris Lattner // -MININT is the only thing that overflows. Unsigned never overflows. 305b081a350b5cad21e5cbea74c618701e8b839c4f6Chris Lattner bool Overflow = !Result.isUnsigned() && Result.Val.isMinSignedValue(); 3061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this operator is live and overflowed, report the issue. 3085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (Overflow && ValueLive) 309204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(Loc, diag::warn_pp_expr_overflow) << Result.getRange(); 3101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DT.State = DefinedTracker::Unknown; 3125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return false; 3135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 3141eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3158ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner case tok::tilde: { 3168ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner SourceLocation Start = PeekTok.getLocation(); 3175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.LexNonComment(PeekTok); 3185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (EvaluateValue(Result, PeekTok, DT, ValueLive, PP)) return true; 3198ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.setBegin(Start); 3208ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner 3215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.5.3.3p4: The sign of the result matches the sign of the operand. 3228ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.Val = ~Result.Val; 3235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DT.State = DefinedTracker::Unknown; 3245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return false; 3258ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner } 3261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3278ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner case tok::exclaim: { 3288ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner SourceLocation Start = PeekTok.getLocation(); 3295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.LexNonComment(PeekTok); 3305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (EvaluateValue(Result, PeekTok, DT, ValueLive, PP)) return true; 3318ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.setBegin(Start); 3328ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.Val = !Result.Val; 3335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.5.3.3p5: The sign of the result is 'int', aka it is signed. 3348ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Result.Val.setIsUnsigned(false); 3351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (DT.State == DefinedTracker::DefinedMacro) 3375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DT.State = DefinedTracker::NotDefinedMacro; 3385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer else if (DT.State == DefinedTracker::NotDefinedMacro) 3395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DT.State = DefinedTracker::DefinedMacro; 3405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return false; 3418ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner } 3421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // FIXME: Handle #assert 3445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 3455f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 3465f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3495f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// getPrecedence - Return the precedence of the specified binary operator 3505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// token. This returns: 3515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// ~0 - Invalid token. 3529e66ba6d1c1c0e11b261e3b20ff02b999621021aChris Lattner/// 14 -> 3 - various operators. 3539e66ba6d1c1c0e11b261e3b20ff02b999621021aChris Lattner/// 0 - 'eom' or ')' 3545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerstatic unsigned getPrecedence(tok::TokenKind Kind) { 3555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer switch (Kind) { 3565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer default: return ~0U; 3575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::percent: 3585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::slash: 3595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::star: return 14; 3605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::plus: 3615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::minus: return 13; 3625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::lessless: 3635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::greatergreater: return 12; 3645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::lessequal: 3655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::less: 3665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::greaterequal: 3675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::greater: return 11; 3685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::exclaimequal: 3695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::equalequal: return 10; 3705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::amp: return 9; 3715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::caret: return 8; 3725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::pipe: return 7; 3735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::ampamp: return 6; 3745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::pipepipe: return 5; 37598ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner case tok::question: return 4; 37698ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner case tok::comma: return 3; 3779189156429c06eea3f75cb01646e2afd78000f39Chris Lattner case tok::colon: return 2; 3785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::r_paren: return 0; // Lowest priority, end of expr. 3795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::eom: return 0; // Lowest priority, end of macro. 3805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 3815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 3825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// EvaluateDirectiveSubExpr - Evaluate the subexpression whose first token is 3858ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner/// PeekTok, and whose precedence is PeekPrec. This returns the result in LHS. 3865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 3875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// If ValueLive is false, then this value is being evaluated in a context where 3885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// the result is not used. As such, avoid diagnostics that relate to 3898ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner/// evaluation, such as division by zero warnings. 3908ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattnerstatic bool EvaluateDirectiveSubExpr(PPValue &LHS, unsigned MinPrec, 391d217773f106856a11879ec79dc468efefaf2ee75Chris Lattner Token &PeekTok, bool ValueLive, 3925f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Preprocessor &PP) { 3935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer unsigned PeekPrec = getPrecedence(PeekTok.getKind()); 3945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this token isn't valid, report the error. 3955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (PeekPrec == ~0U) { 396204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(PeekTok.getLocation(), diag::err_pp_expr_bad_token_binop) 397204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << LHS.getRange(); 3985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 3995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 4001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer while (1) { 4025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this token has a lower precedence than we are allowed to parse, return 4035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // it so that higher levels of the recursion can parse it. 4045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (PeekPrec < MinPrec) 4055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return false; 4061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer tok::TokenKind Operator = PeekTok.getKind(); 4081eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this is a short-circuiting operator, see if the RHS of the operator is 4101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // dead. Note that this cannot just clobber ValueLive. Consider 4115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // "0 && 1 ? 4 : 1 / 0", which is parsed as "(0 && 1) ? 4 : (1 / 0)". In 4125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // this example, the RHS of the && being dead does not make the rest of the 4135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // expr dead. 4145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer bool RHSIsLive; 4158ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner if (Operator == tok::ampamp && LHS.Val == 0) 4165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer RHSIsLive = false; // RHS of "0 && x" is dead. 4178ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner else if (Operator == tok::pipepipe && LHS.Val != 0) 4185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer RHSIsLive = false; // RHS of "1 || x" is dead. 4198ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner else if (Operator == tok::question && LHS.Val == 0) 4205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer RHSIsLive = false; // RHS (x) of "0 ? x : y" is dead. 4215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer else 4225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer RHSIsLive = ValueLive; 4235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 4248ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner // Consume the operator, remembering the operator's location for reporting. 4258ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner SourceLocation OpLoc = PeekTok.getLocation(); 4265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.LexNonComment(PeekTok); 4275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 4288ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner PPValue RHS(LHS.getBitWidth()); 4295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Parse the RHS of the operator. 4305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DefinedTracker DT; 4315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (EvaluateValue(RHS, PeekTok, DT, RHSIsLive, PP)) return true; 4325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 4335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Remember the precedence of this operator and get the precedence of the 4345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // operator immediately to the right of the RHS. 4355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer unsigned ThisPrec = PeekPrec; 4365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PeekPrec = getPrecedence(PeekTok.getKind()); 4375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 4385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this token isn't valid, report the error. 4395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (PeekPrec == ~0U) { 440204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(PeekTok.getLocation(), diag::err_pp_expr_bad_token_binop) 441204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << RHS.getRange(); 4425f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 4435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 4441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 44598ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner // Decide whether to include the next binop in this subexpression. For 44698ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner // example, when parsing x+y*z and looking at '*', we want to recursively 44744cbbb05f544c5ee171000b2abf905aa7dc5340dChris Lattner // handle y*z as a single subexpression. We do this because the precedence 44844cbbb05f544c5ee171000b2abf905aa7dc5340dChris Lattner // of * is higher than that of +. The only strange case we have to handle 44944cbbb05f544c5ee171000b2abf905aa7dc5340dChris Lattner // here is for the ?: operator, where the precedence is actually lower than 45044cbbb05f544c5ee171000b2abf905aa7dc5340dChris Lattner // the LHS of the '?'. The grammar rule is: 45198ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner // 45298ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner // conditional-expression ::= 45398ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner // logical-OR-expression ? expression : conditional-expression 45498ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner // where 'expression' is actually comma-expression. 45598ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner unsigned RHSPrec; 45698ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner if (Operator == tok::question) 45798ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner // The RHS of "?" should be maximally consumed as an expression. 45898ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner RHSPrec = getPrecedence(tok::comma); 45998ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner else // All others should munch while higher precedence. 46098ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner RHSPrec = ThisPrec+1; 4611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 46298ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner if (PeekPrec >= RHSPrec) { 46398ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner if (EvaluateDirectiveSubExpr(RHS, RHSPrec, PeekTok, RHSIsLive, PP)) 4645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 4655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PeekPrec = getPrecedence(PeekTok.getKind()); 4665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 4675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(PeekPrec <= ThisPrec && "Recursion didn't work!"); 4681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Usual arithmetic conversions (C99 6.3.1.8p1): result is unsigned if 4701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // either operand is unsigned. 4715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::APSInt Res(LHS.getBitWidth()); 472019ef7e1024562f9647d80ded7be8b8c1d23678aChris Lattner switch (Operator) { 473019ef7e1024562f9647d80ded7be8b8c1d23678aChris Lattner case tok::question: // No UAC for x and y in "x ? y : z". 474019ef7e1024562f9647d80ded7be8b8c1d23678aChris Lattner case tok::lessless: // Shift amount doesn't UAC with shift value. 475019ef7e1024562f9647d80ded7be8b8c1d23678aChris Lattner case tok::greatergreater: // Shift amount doesn't UAC with shift value. 476019ef7e1024562f9647d80ded7be8b8c1d23678aChris Lattner case tok::comma: // Comma operands are not subject to UACs. 477019ef7e1024562f9647d80ded7be8b8c1d23678aChris Lattner case tok::pipepipe: // Logical || does not do UACs. 478019ef7e1024562f9647d80ded7be8b8c1d23678aChris Lattner case tok::ampamp: // Logical && does not do UACs. 479019ef7e1024562f9647d80ded7be8b8c1d23678aChris Lattner break; // No UAC 480019ef7e1024562f9647d80ded7be8b8c1d23678aChris Lattner default: 4815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Res.setIsUnsigned(LHS.isUnsigned()|RHS.isUnsigned()); 4825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this just promoted something from signed to unsigned, and if the 4835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // value was negative, warn about it. 4845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (ValueLive && Res.isUnsigned()) { 4858ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner if (!LHS.isUnsigned() && LHS.Val.isNegative()) 486204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(OpLoc, diag::warn_pp_convert_lhs_to_positive) 487204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << LHS.Val.toString(10, true) + " to " + 488204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner LHS.Val.toString(10, false) 489204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << LHS.getRange() << RHS.getRange(); 4908ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner if (!RHS.isUnsigned() && RHS.Val.isNegative()) 491204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(OpLoc, diag::warn_pp_convert_rhs_to_positive) 492204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << RHS.Val.toString(10, true) + " to " + 493204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner RHS.Val.toString(10, false) 494204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << LHS.getRange() << RHS.getRange(); 4955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 4968ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner LHS.Val.setIsUnsigned(Res.isUnsigned()); 4978ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner RHS.Val.setIsUnsigned(Res.isUnsigned()); 4985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 4991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // FIXME: All of these should detect and report overflow?? 5015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer bool Overflow = false; 5025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer switch (Operator) { 5035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer default: assert(0 && "Unknown operator token!"); 5045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::percent: 5058ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner if (RHS.Val != 0) 5068ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val % RHS.Val; 5078ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner else if (ValueLive) { 508204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(OpLoc, diag::err_pp_remainder_by_zero) 509204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << LHS.getRange() << RHS.getRange(); 5108ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner return true; 5115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 5125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::slash: 5148ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner if (RHS.Val != 0) { 5158ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val / RHS.Val; 5168ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner if (LHS.Val.isSigned()) // MININT/-1 --> overflow. 5178ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Overflow = LHS.Val.isMinSignedValue() && RHS.Val.isAllOnesValue(); 5188ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner } else if (ValueLive) { 519204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(OpLoc, diag::err_pp_division_by_zero) 520204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << LHS.getRange() << RHS.getRange(); 5218ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner return true; 5225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 5235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::star: 5268ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val * RHS.Val; 5273265a42e5a87269fce5d7a7cdd7bafe62c7becfeEli Friedman if (Res.isSigned() && LHS.Val != 0 && RHS.Val != 0) 5288ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Overflow = Res/RHS.Val != LHS.Val || Res/LHS.Val != RHS.Val; 5295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::lessless: { 5315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Determine whether overflow is about to happen. 5328ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner unsigned ShAmt = static_cast<unsigned>(RHS.Val.getLimitedValue()); 5338ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner if (ShAmt >= LHS.Val.getBitWidth()) 5348ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Overflow = true, ShAmt = LHS.Val.getBitWidth()-1; 5355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer else if (LHS.isUnsigned()) 5363265a42e5a87269fce5d7a7cdd7bafe62c7becfeEli Friedman Overflow = false; 5378ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner else if (LHS.Val.isNonNegative()) // Don't allow sign change. 5388ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Overflow = ShAmt >= LHS.Val.countLeadingZeros(); 5395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer else 5408ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Overflow = ShAmt >= LHS.Val.countLeadingOnes(); 5411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5428ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val << ShAmt; 5435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 5455f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::greatergreater: { 5465f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Determine whether overflow is about to happen. 5478ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner unsigned ShAmt = static_cast<unsigned>(RHS.Val.getLimitedValue()); 5485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (ShAmt >= LHS.getBitWidth()) 5495f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Overflow = true, ShAmt = LHS.getBitWidth()-1; 5508ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val >> ShAmt; 5515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 5535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::plus: 5548ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val + RHS.Val; 5555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (LHS.isUnsigned()) 5563265a42e5a87269fce5d7a7cdd7bafe62c7becfeEli Friedman Overflow = false; 5578ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner else if (LHS.Val.isNonNegative() == RHS.Val.isNonNegative() && 5588ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res.isNonNegative() != LHS.Val.isNonNegative()) 5595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Overflow = true; // Overflow for signed addition. 5605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::minus: 5628ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val - RHS.Val; 5635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (LHS.isUnsigned()) 5643265a42e5a87269fce5d7a7cdd7bafe62c7becfeEli Friedman Overflow = false; 5658ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner else if (LHS.Val.isNonNegative() != RHS.Val.isNonNegative() && 5668ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res.isNonNegative() != LHS.Val.isNonNegative()) 5675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Overflow = true; // Overflow for signed subtraction. 5685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::lessequal: 5708ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val <= RHS.Val; 5715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Res.setIsUnsigned(false); // C99 6.5.8p6, result is always int (signed) 5725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::less: 5748ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val < RHS.Val; 5755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Res.setIsUnsigned(false); // C99 6.5.8p6, result is always int (signed) 5765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::greaterequal: 5788ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val >= RHS.Val; 5795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Res.setIsUnsigned(false); // C99 6.5.8p6, result is always int (signed) 5805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::greater: 5828ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val > RHS.Val; 5835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Res.setIsUnsigned(false); // C99 6.5.8p6, result is always int (signed) 5845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::exclaimequal: 5868ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val != RHS.Val; 5875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Res.setIsUnsigned(false); // C99 6.5.9p3, result is always int (signed) 5885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5895f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::equalequal: 5908ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val == RHS.Val; 5915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Res.setIsUnsigned(false); // C99 6.5.9p3, result is always int (signed) 5925f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::amp: 5948ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val & RHS.Val; 5955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::caret: 5978ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val ^ RHS.Val; 5985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 5995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::pipe: 6008ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val | RHS.Val; 6015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 6025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::ampamp: 6038ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = (LHS.Val != 0 && RHS.Val != 0); 6045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Res.setIsUnsigned(false); // C99 6.5.13p3, result is always int (signed) 6055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 6065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::pipepipe: 6078ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = (LHS.Val != 0 || RHS.Val != 0); 6085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Res.setIsUnsigned(false); // C99 6.5.14p3, result is always int (signed) 6095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 6105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::comma: 6119189156429c06eea3f75cb01646e2afd78000f39Chris Lattner // Comma is invalid in pp expressions in c89/c++ mode, but is valid in C99 6129189156429c06eea3f75cb01646e2afd78000f39Chris Lattner // if not being evaluated. 6139189156429c06eea3f75cb01646e2afd78000f39Chris Lattner if (!PP.getLangOptions().C99 || ValueLive) 614204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(OpLoc, diag::ext_pp_comma_expr) 615204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << LHS.getRange() << RHS.getRange(); 6168ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = RHS.Val; // LHS = LHS,RHS -> RHS. 6171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump break; 6185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::question: { 6195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Parse the : part of the expression. 62022f6bbcafa8871f4f20c4402d9cbc5c024fee99aChris Lattner if (PeekTok.isNot(tok::colon)) { 621204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(PeekTok.getLocation(), diag::err_expected_colon) 622204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << LHS.getRange(), RHS.getRange(); 62328eb7e992b9a266abb300da25b6d3c1557cec361Chris Lattner PP.Diag(OpLoc, diag::note_matching) << "?"; 6245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 6255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 6265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Consume the :. 6275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.LexNonComment(PeekTok); 6285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 6295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Evaluate the value after the :. 6308ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner bool AfterColonLive = ValueLive && LHS.Val == 0; 6318ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner PPValue AfterColonVal(LHS.getBitWidth()); 6325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DefinedTracker DT; 6335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (EvaluateValue(AfterColonVal, PeekTok, DT, AfterColonLive, PP)) 6345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 6355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 63644cbbb05f544c5ee171000b2abf905aa7dc5340dChris Lattner // Parse anything after the : with the same precedence as ?. We allow 63744cbbb05f544c5ee171000b2abf905aa7dc5340dChris Lattner // things of equal precedence because ?: is right associative. 63898ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner if (EvaluateDirectiveSubExpr(AfterColonVal, ThisPrec, 6395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PeekTok, AfterColonLive, PP)) 6405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 6411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6425f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Now that we have the condition, the LHS and the RHS of the :, evaluate. 6438ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner Res = LHS.Val != 0 ? RHS.Val : AfterColonVal.Val; 6448ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner RHS.setEnd(AfterColonVal.getRange().getEnd()); 6455f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 6465f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Usual arithmetic conversions (C99 6.3.1.8p1): result is unsigned if 6475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // either operand is unsigned. 6485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Res.setIsUnsigned(RHS.isUnsigned() | AfterColonVal.isUnsigned()); 6491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Figure out the precedence of the token after the : part. 6515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PeekPrec = getPrecedence(PeekTok.getKind()); 6525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 6535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 6545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case tok::colon: 6555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Don't allow :'s to float around without being part of ?: exprs. 656204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(OpLoc, diag::err_pp_colon_without_question) 657204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << LHS.getRange() << RHS.getRange(); 6585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return true; 6595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 6605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 6615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this operator is live and overflowed, report the issue. 6625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (Overflow && ValueLive) 663204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner PP.Diag(OpLoc, diag::warn_pp_expr_overflow) 664204b2fed909b1eabea7aeb6caadd7cff718edee5Chris Lattner << LHS.getRange() << RHS.getRange(); 6651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Put the result back into 'LHS' for our next iteration. 6678ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner LHS.Val = Res; 6688ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner LHS.setEnd(RHS.getRange().getEnd()); 6695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 6701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return false; 6725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 6735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 6745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// EvaluateDirectiveExpression - Evaluate an integer constant expression that 6755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// may occur after a #if or #elif directive. If the expression is equivalent 6765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// to "!defined(X)" return X in IfNDefMacro. 6775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerbool Preprocessor:: 6785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid SpencerEvaluateDirectiveExpression(IdentifierInfo *&IfNDefMacro) { 679a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner // Save the current state of 'DisableMacroExpansion' and reset it to false. If 680a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner // 'DisableMacroExpansion' is true, then we must be in a macro argument list 681a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner // in which case a directive is undefined behavior. We want macros to be able 682a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner // to recursively expand in order to get more gcc-list behavior, so we force 683a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner // DisableMacroExpansion to false and restore it when we're done parsing the 684a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner // expression. 685a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner bool DisableMacroExpansionAtStartOfDirective = DisableMacroExpansion; 686a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner DisableMacroExpansion = false; 687a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner 6885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Peek ahead one token. 689d217773f106856a11879ec79dc468efefaf2ee75Chris Lattner Token Tok; 6905f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Lex(Tok); 6911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6925f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.10.1p3 - All expressions are evaluated as intmax_t or uintmax_t. 69398be4943e8dc4f3905629a7102668960873cf863Chris Lattner unsigned BitWidth = getTargetInfo().getIntMaxTWidth(); 6941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6958ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner PPValue ResVal(BitWidth); 6965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DefinedTracker DT; 6975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (EvaluateValue(ResVal, Tok, DT, true, *this)) { 6985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Parse error, skip the rest of the macro line. 69922f6bbcafa8871f4f20c4402d9cbc5c024fee99aChris Lattner if (Tok.isNot(tok::eom)) 7005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DiscardUntilEndOfDirective(); 701a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner 702a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner // Restore 'DisableMacroExpansion'. 703a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner DisableMacroExpansion = DisableMacroExpansionAtStartOfDirective; 7045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return false; 7055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 7061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If we are at the end of the expression after just parsing a value, there 7085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // must be no (unparenthesized) binary operators involved, so we can exit 7095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // directly. 71022f6bbcafa8871f4f20c4402d9cbc5c024fee99aChris Lattner if (Tok.is(tok::eom)) { 7115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If the expression we parsed was of the form !defined(macro), return the 7125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // macro in IfNDefMacro. 7135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (DT.State == DefinedTracker::NotDefinedMacro) 7145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer IfNDefMacro = DT.TheMacro; 7151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 716a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner // Restore 'DisableMacroExpansion'. 717a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner DisableMacroExpansion = DisableMacroExpansionAtStartOfDirective; 7188ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner return ResVal.Val != 0; 7195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 7201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, we must have a binary operator (e.g. "#if 1 < 2"), so parse the 7225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // operator and the stuff after it. 72398ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner if (EvaluateDirectiveSubExpr(ResVal, getPrecedence(tok::question), 72498ed49f3709f48d6abe1bc8deb418d0af89b8014Chris Lattner Tok, true, *this)) { 7255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Parse error, skip the rest of the macro line. 72622f6bbcafa8871f4f20c4402d9cbc5c024fee99aChris Lattner if (Tok.isNot(tok::eom)) 7275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DiscardUntilEndOfDirective(); 728a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner 729a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner // Restore 'DisableMacroExpansion'. 730a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner DisableMacroExpansion = DisableMacroExpansionAtStartOfDirective; 7315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return false; 7325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 7331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If we aren't at the tok::eom token, something bad happened, like an extra 7355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // ')' token. 73622f6bbcafa8871f4f20c4402d9cbc5c024fee99aChris Lattner if (Tok.isNot(tok::eom)) { 7375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Diag(Tok, diag::err_pp_expected_eol); 7385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DiscardUntilEndOfDirective(); 7395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 7401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 741a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner // Restore 'DisableMacroExpansion'. 742a3e008abc51933d567303a1b4bd17e68c798f60eChris Lattner DisableMacroExpansion = DisableMacroExpansionAtStartOfDirective; 7438ed3044a33679cbfa0617d465a50ec557d671ed7Chris Lattner return ResVal.Val != 0; 7445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7455f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 746