Pragma.cpp revision 0b9e736308af5397f558ffc8e780c438c2fdb563
15f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===--- Pragma.cpp - Pragma registration and handling --------------------===// 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 PragmaHandler/PragmaTable interfaces and implements 115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// pragma related methods of the Preprocessor class. 125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "clang/Lex/Pragma.h" 165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "clang/Lex/HeaderSearch.h" 175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "clang/Lex/Preprocessor.h" 185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "clang/Basic/Diagnostic.h" 195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "clang/Basic/FileManager.h" 205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "clang/Basic/SourceManager.h" 215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerusing namespace clang; 225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// Out-of-line destructor to provide a home for the class. 245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid SpencerPragmaHandler::~PragmaHandler() { 255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// PragmaNamespace Implementation. 295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid SpencerPragmaNamespace::~PragmaNamespace() { 335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer for (unsigned i = 0, e = Handlers.size(); i != e; ++i) 345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer delete Handlers[i]; 355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// FindHandler - Check to see if there is already a handler for the 385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// specified name. If not, return the handler for the null identifier if it 395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// exists, otherwise return null. If IgnoreNull is true (the default) then 405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// the null handler isn't returned on failure to match. 415f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid SpencerPragmaHandler *PragmaNamespace::FindHandler(const IdentifierInfo *Name, 425f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer bool IgnoreNull) const { 435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PragmaHandler *NullHandler = 0; 445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer for (unsigned i = 0, e = Handlers.size(); i != e; ++i) { 455f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (Handlers[i]->getName() == Name) 465f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return Handlers[i]; 475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (Handlers[i]->getName() == 0) 495f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer NullHandler = Handlers[i]; 505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return IgnoreNull ? 0 : NullHandler; 525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 54d217773f106856a11879ec79dc468efefaf2ee75Chris Lattnervoid PragmaNamespace::HandlePragma(Preprocessor &PP, Token &Tok) { 555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Read the 'namespace' that the directive is in, e.g. STDC. Do not macro 565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // expand it, the user can have a STDC #define, that should not affect this. 575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.LexUnexpandedToken(Tok); 585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Get the handler for this token. If there is no handler, ignore the pragma. 605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PragmaHandler *Handler = FindHandler(Tok.getIdentifierInfo(), false); 615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (Handler == 0) return; 625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, pass it down. 645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Handler->HandlePragma(PP, Tok); 655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// Preprocessor Pragma Directive Handling. 695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// HandlePragmaDirective - The "#pragma" directive has been parsed. Lex the 725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// rest of the pragma, passing it to the registered pragma handlers. 735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencervoid Preprocessor::HandlePragmaDirective() { 745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ++NumPragma; 755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Invoke the first level of pragma handlers which reads the namespace id. 77d217773f106856a11879ec79dc468efefaf2ee75Chris Lattner Token Tok; 785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PragmaHandlers->HandlePragma(*this, Tok); 795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If the pragma handler didn't read the rest of the line, consume it now. 815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (CurLexer->ParsingPreprocessorDirective) 825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer DiscardUntilEndOfDirective(); 835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// Handle_Pragma - Read a _Pragma directive, slice it up, process it, then 865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// return the first token after the directive. The _Pragma token has just 875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// been read into 'Tok'. 88d217773f106856a11879ec79dc468efefaf2ee75Chris Lattnervoid Preprocessor::Handle_Pragma(Token &Tok) { 895f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Remember the pragma token location. 905f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer SourceLocation PragmaLoc = Tok.getLocation(); 915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 925f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Read the '('. 935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Lex(Tok); 9422f6bbcafa8871f4f20c4402d9cbc5c024fee99aChris Lattner if (Tok.isNot(tok::l_paren)) 955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return Diag(PragmaLoc, diag::err__Pragma_malformed); 965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Read the '"..."'. 985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Lex(Tok); 9922f6bbcafa8871f4f20c4402d9cbc5c024fee99aChris Lattner if (Tok.isNot(tok::string_literal) && Tok.isNot(tok::wide_string_literal)) 1005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return Diag(PragmaLoc, diag::err__Pragma_malformed); 1015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Remember the string. 1035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer std::string StrVal = getSpelling(Tok); 1045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer SourceLocation StrLoc = Tok.getLocation(); 1055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Read the ')'. 1075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Lex(Tok); 10822f6bbcafa8871f4f20c4402d9cbc5c024fee99aChris Lattner if (Tok.isNot(tok::r_paren)) 1095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return Diag(PragmaLoc, diag::err__Pragma_malformed); 1105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // The _Pragma is lexically sound. Destringize according to C99 6.10.9.1. 1125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (StrVal[0] == 'L') // Remove L prefix. 1135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer StrVal.erase(StrVal.begin()); 1145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(StrVal[0] == '"' && StrVal[StrVal.size()-1] == '"' && 1155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer "Invalid string token!"); 1165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Remove the front quote, replacing it with a space, so that the pragma 1185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // contents appear to have a space before them. 1195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer StrVal[0] = ' '; 1205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Replace the terminating quote with a \n\0. 1225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer StrVal[StrVal.size()-1] = '\n'; 1235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer StrVal += '\0'; 1245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Remove escaped quotes and escapes. 1265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer for (unsigned i = 0, e = StrVal.size(); i != e-1; ++i) { 1275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (StrVal[i] == '\\' && 1285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer (StrVal[i+1] == '\\' || StrVal[i+1] == '"')) { 1295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // \\ -> '\' and \" -> '"'. 1305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer StrVal.erase(StrVal.begin()+i); 1315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer --e; 1325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Plop the string (including the newline and trailing null) into a buffer 1365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // where we can lex it. 1375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer SourceLocation TokLoc = CreateString(&StrVal[0], StrVal.size(), StrLoc); 1385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer const char *StrData = SourceMgr.getCharacterData(TokLoc); 1395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Make and enter a lexer object so that we lex and expand the tokens just 1415f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // like any others. 14225bdb51276d3bfc180a68688082071505a00ed27Chris Lattner Lexer *TL = new Lexer(TokLoc, *this, 1435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer StrData, StrData+StrVal.size()-1 /* no null */); 1445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1455f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Ensure that the lexer thinks it is inside a directive, so that end \n will 1465f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // return an EOM token. 1475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer TL->ParsingPreprocessorDirective = true; 1485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1495f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // This lexer really is for _Pragma. 1505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer TL->Is_PragmaLexer = true; 1515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer EnterSourceFileWithLexer(TL, 0); 1535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // With everything set up, lex this as a #pragma directive. 1555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer HandlePragmaDirective(); 1565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Finally, return whatever came after the pragma directive. 1585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return Lex(Tok); 1595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// HandlePragmaOnce - Handle #pragma once. OnceTok is the 'once'. 1645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 165d217773f106856a11879ec79dc468efefaf2ee75Chris Lattnervoid Preprocessor::HandlePragmaOnce(Token &OnceTok) { 1665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (isInPrimaryFile()) { 1675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Diag(OnceTok, diag::pp_pragma_once_in_main_file); 1685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return; 1695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Get the current file lexer we're looking at. Ignore _Pragma 'files' etc. 1729dc1f530c086d2c16f8cba758b0f59a5bf41323aChris Lattner SourceLocation FileLoc = getCurrentFileLexer()->getFileLoc(); 1735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Mark the file as a once-only file now. 1759dc1f530c086d2c16f8cba758b0f59a5bf41323aChris Lattner HeaderInfo.MarkFileIncludeOnce(SourceMgr.getFileEntryForLoc(FileLoc)); 1765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1782243449253475574fc6f14986ff8f7fce5d46799Chris Lattnervoid Preprocessor::HandlePragmaMark() { 1792243449253475574fc6f14986ff8f7fce5d46799Chris Lattner assert(CurLexer && "No current lexer?"); 1802243449253475574fc6f14986ff8f7fce5d46799Chris Lattner CurLexer->ReadToEndOfLine(); 1812243449253475574fc6f14986ff8f7fce5d46799Chris Lattner} 1822243449253475574fc6f14986ff8f7fce5d46799Chris Lattner 1832243449253475574fc6f14986ff8f7fce5d46799Chris Lattner 1845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// HandlePragmaPoison - Handle #pragma GCC poison. PoisonTok is the 'poison'. 1855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 186d217773f106856a11879ec79dc468efefaf2ee75Chris Lattnervoid Preprocessor::HandlePragmaPoison(Token &PoisonTok) { 187d217773f106856a11879ec79dc468efefaf2ee75Chris Lattner Token Tok; 1885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1895f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer while (1) { 1905f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Read the next token to poison. While doing this, pretend that we are 1915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // skipping while reading the identifier to poison. 1925f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // This avoids errors on code like: 1935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // #pragma GCC poison X 1945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // #pragma GCC poison X 1955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (CurLexer) CurLexer->LexingRawMode = true; 1965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer LexUnexpandedToken(Tok); 1975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (CurLexer) CurLexer->LexingRawMode = false; 1985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If we reached the end of line, we're done. 20022f6bbcafa8871f4f20c4402d9cbc5c024fee99aChris Lattner if (Tok.is(tok::eom)) return; 2015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Can only poison identifiers. 20322f6bbcafa8871f4f20c4402d9cbc5c024fee99aChris Lattner if (Tok.isNot(tok::identifier)) { 2045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Diag(Tok, diag::err_pp_invalid_poison); 2055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return; 2065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Look up the identifier info for the token. We disabled identifier lookup 2095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // by saying we're skipping contents, so we need to do this manually. 2105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer IdentifierInfo *II = LookUpIdentifierInfo(Tok); 2115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Already poisoned. 2135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (II->isPoisoned()) continue; 2145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this is a macro identifier, emit a warning. 2160edde55077cc3cb9fffeba19f5936f05a68c8e2bChris Lattner if (II->hasMacroDefinition()) 2175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Diag(Tok, diag::pp_poisoning_existing_macro); 2185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Finally, poison it! 2205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer II->setIsPoisoned(); 2215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// HandlePragmaSystemHeader - Implement #pragma GCC system_header. We know 2255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// that the whole directive has been parsed. 226d217773f106856a11879ec79dc468efefaf2ee75Chris Lattnervoid Preprocessor::HandlePragmaSystemHeader(Token &SysHeaderTok) { 2275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (isInPrimaryFile()) { 2285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Diag(SysHeaderTok, diag::pp_pragma_sysheader_in_main_file); 2295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return; 2305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Get the current file lexer we're looking at. Ignore _Pragma 'files' etc. 2335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Lexer *TheLexer = getCurrentFileLexer(); 2345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Mark the file as a system header. 2369dc1f530c086d2c16f8cba758b0f59a5bf41323aChris Lattner const FileEntry *File = SourceMgr.getFileEntryForLoc(TheLexer->getFileLoc()); 2375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer HeaderInfo.MarkFileSystemHeader(File); 2385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Notify the client, if desired, that we are in a new source file. 2405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (Callbacks) 2415f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Callbacks->FileChanged(TheLexer->getSourceLocation(TheLexer->BufferPtr), 2420b9e736308af5397f558ffc8e780c438c2fdb563Chris Lattner PPCallbacks::SystemHeaderPragma, SrcMgr::C_System); 2435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2455f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// HandlePragmaDependency - Handle #pragma GCC dependency "foo" blah. 2465f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 247d217773f106856a11879ec79dc468efefaf2ee75Chris Lattnervoid Preprocessor::HandlePragmaDependency(Token &DependencyTok) { 248d217773f106856a11879ec79dc468efefaf2ee75Chris Lattner Token FilenameTok; 2495f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer CurLexer->LexIncludeFilename(FilenameTok); 2505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If the token kind is EOM, the error has already been diagnosed. 25222f6bbcafa8871f4f20c4402d9cbc5c024fee99aChris Lattner if (FilenameTok.is(tok::eom)) 2535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return; 2545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Reserve a buffer to get the spelling. 2565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::SmallVector<char, 128> FilenameBuffer; 2575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer FilenameBuffer.resize(FilenameTok.getLength()); 2585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 259f1c99acc544a4e70f308db4e7200ca04cd5a06d2Chris Lattner const char *FilenameStart = &FilenameBuffer[0]; 260f1c99acc544a4e70f308db4e7200ca04cd5a06d2Chris Lattner unsigned Len = getSpelling(FilenameTok, FilenameStart); 261f1c99acc544a4e70f308db4e7200ca04cd5a06d2Chris Lattner const char *FilenameEnd = FilenameStart+Len; 262f1c99acc544a4e70f308db4e7200ca04cd5a06d2Chris Lattner bool isAngled = GetIncludeFilenameSpelling(FilenameTok.getLocation(), 2635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer FilenameStart, FilenameEnd); 2645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If GetIncludeFilenameSpelling set the start ptr to null, there was an 2655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // error. 2665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (FilenameStart == 0) 2675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return; 2685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Search include directories for this file. 2705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer const DirectoryLookup *CurDir; 2715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer const FileEntry *File = LookupFile(FilenameStart, FilenameEnd, 2725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer isAngled, 0, CurDir); 2735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (File == 0) 2745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return Diag(FilenameTok, diag::err_pp_file_not_found, 2755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer std::string(FilenameStart, FilenameEnd)); 2765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2779dc1f530c086d2c16f8cba758b0f59a5bf41323aChris Lattner SourceLocation FileLoc = getCurrentFileLexer()->getFileLoc(); 2789dc1f530c086d2c16f8cba758b0f59a5bf41323aChris Lattner const FileEntry *CurFile = SourceMgr.getFileEntryForLoc(FileLoc); 2795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this file is older than the file it depends on, emit a diagnostic. 2815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (CurFile && CurFile->getModificationTime() < File->getModificationTime()) { 2825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Lex tokens at the end of the message and include them in the message. 2835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer std::string Message; 2845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Lex(DependencyTok); 28522f6bbcafa8871f4f20c4402d9cbc5c024fee99aChris Lattner while (DependencyTok.isNot(tok::eom)) { 2865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Message += getSpelling(DependencyTok) + " "; 2875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Lex(DependencyTok); 2885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2895f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2905f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Message.erase(Message.end()-1); 2915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Diag(FilenameTok, diag::pp_out_of_date_dependency, Message); 2925f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// AddPragmaHandler - Add the specified pragma handler to the preprocessor. 2975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// If 'Namespace' is non-null, then it is a token required to exist on the 2985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// pragma line before the pragma string starts, e.g. "STDC" or "GCC". 2995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencervoid Preprocessor::AddPragmaHandler(const char *Namespace, 3005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PragmaHandler *Handler) { 3015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PragmaNamespace *InsertNS = PragmaHandlers; 3025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this is specified to be in a namespace, step down into it. 3045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (Namespace) { 3055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer IdentifierInfo *NSID = getIdentifierInfo(Namespace); 3065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If there is already a pragma handler with the name of this namespace, 3085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // we either have an error (directive with the same name as a namespace) or 3095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // we already have the namespace to insert into. 3105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (PragmaHandler *Existing = PragmaHandlers->FindHandler(NSID)) { 3115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer InsertNS = Existing->getIfNamespace(); 3125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(InsertNS != 0 && "Cannot have a pragma namespace and pragma" 3135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer " handler with the same name!"); 3145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else { 3155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, this namespace doesn't exist yet, create and insert the 3165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // handler for it. 3175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer InsertNS = new PragmaNamespace(NSID); 3185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PragmaHandlers->AddPragma(InsertNS); 3195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 3205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 3215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Check to make sure we don't already have a pragma for this identifier. 3235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(!InsertNS->FindHandler(Handler->getName()) && 3245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer "Pragma handler already exists for this identifier!"); 3255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer InsertNS->AddPragma(Handler); 3265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 3275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencernamespace { 3292243449253475574fc6f14986ff8f7fce5d46799Chris Lattner/// PragmaOnceHandler - "#pragma once" marks the file as atomically included. 3305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerstruct PragmaOnceHandler : public PragmaHandler { 3315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PragmaOnceHandler(const IdentifierInfo *OnceID) : PragmaHandler(OnceID) {} 332d217773f106856a11879ec79dc468efefaf2ee75Chris Lattner virtual void HandlePragma(Preprocessor &PP, Token &OnceTok) { 3335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.CheckEndOfDirective("#pragma once"); 3345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.HandlePragmaOnce(OnceTok); 3355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 3365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer}; 3375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3382243449253475574fc6f14986ff8f7fce5d46799Chris Lattner/// PragmaMarkHandler - "#pragma mark ..." is ignored by the compiler, and the 3392243449253475574fc6f14986ff8f7fce5d46799Chris Lattner/// rest of the line is not lexed. 3402243449253475574fc6f14986ff8f7fce5d46799Chris Lattnerstruct PragmaMarkHandler : public PragmaHandler { 3412243449253475574fc6f14986ff8f7fce5d46799Chris Lattner PragmaMarkHandler(const IdentifierInfo *MarkID) : PragmaHandler(MarkID) {} 3422243449253475574fc6f14986ff8f7fce5d46799Chris Lattner virtual void HandlePragma(Preprocessor &PP, Token &MarkTok) { 3432243449253475574fc6f14986ff8f7fce5d46799Chris Lattner PP.HandlePragmaMark(); 3442243449253475574fc6f14986ff8f7fce5d46799Chris Lattner } 3452243449253475574fc6f14986ff8f7fce5d46799Chris Lattner}; 3462243449253475574fc6f14986ff8f7fce5d46799Chris Lattner 3472243449253475574fc6f14986ff8f7fce5d46799Chris Lattner/// PragmaPoisonHandler - "#pragma poison x" marks x as not usable. 3485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerstruct PragmaPoisonHandler : public PragmaHandler { 3495f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PragmaPoisonHandler(const IdentifierInfo *ID) : PragmaHandler(ID) {} 350d217773f106856a11879ec79dc468efefaf2ee75Chris Lattner virtual void HandlePragma(Preprocessor &PP, Token &PoisonTok) { 3515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.HandlePragmaPoison(PoisonTok); 3525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 3535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer}; 3545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3552243449253475574fc6f14986ff8f7fce5d46799Chris Lattner/// PragmaSystemHeaderHandler - "#pragma system_header" marks the current file 3562243449253475574fc6f14986ff8f7fce5d46799Chris Lattner/// as a system header, which silences warnings in it. 3575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerstruct PragmaSystemHeaderHandler : public PragmaHandler { 3585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PragmaSystemHeaderHandler(const IdentifierInfo *ID) : PragmaHandler(ID) {} 359d217773f106856a11879ec79dc468efefaf2ee75Chris Lattner virtual void HandlePragma(Preprocessor &PP, Token &SHToken) { 3605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.HandlePragmaSystemHeader(SHToken); 3615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.CheckEndOfDirective("#pragma"); 3625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 3635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer}; 3645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerstruct PragmaDependencyHandler : public PragmaHandler { 3655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PragmaDependencyHandler(const IdentifierInfo *ID) : PragmaHandler(ID) {} 366d217773f106856a11879ec79dc468efefaf2ee75Chris Lattner virtual void HandlePragma(Preprocessor &PP, Token &DepToken) { 3675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.HandlePragmaDependency(DepToken); 3685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 3695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer}; 3705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} // end anonymous namespace 3715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// RegisterBuiltinPragmas - Install the standard preprocessor pragmas: 3745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// #pragma GCC poison/system_header/dependency and #pragma once. 3755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencervoid Preprocessor::RegisterBuiltinPragmas() { 3765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer AddPragmaHandler(0, new PragmaOnceHandler(getIdentifierInfo("once"))); 3772243449253475574fc6f14986ff8f7fce5d46799Chris Lattner AddPragmaHandler(0, new PragmaMarkHandler(getIdentifierInfo("mark"))); 3785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer AddPragmaHandler("GCC", new PragmaPoisonHandler(getIdentifierInfo("poison"))); 3795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer AddPragmaHandler("GCC", new PragmaSystemHeaderHandler( 3805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer getIdentifierInfo("system_header"))); 3815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer AddPragmaHandler("GCC", new PragmaDependencyHandler( 3825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer getIdentifierInfo("dependency"))); 3835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 384