PTHLexer.cpp revision 0e50b6e7c104d00614baa3d80df62f1630a94d9c
1274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek//===--- PTHLexer.cpp - Lex from a token stream ---------------------------===// 2274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek// 3274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek// The LLVM Compiler Infrastructure 4274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek// 5274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek// This file is distributed under the University of Illinois Open Source 6274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek// License. See LICENSE.TXT for details. 7274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek// 8274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek//===----------------------------------------------------------------------===// 9274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek// 10274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek// This file implements the PTHLexer interface. 11274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek// 12274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek//===----------------------------------------------------------------------===// 13274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek 140c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek#include "clang/Basic/TokenKinds.h" 150c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek#include "clang/Basic/FileManager.h" 160c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek#include "clang/Basic/IdentifierTable.h" 17274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek#include "clang/Lex/PTHLexer.h" 18274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek#include "clang/Lex/Preprocessor.h" 190c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek#include "clang/Lex/PTHManager.h" 200c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek#include "clang/Lex/Token.h" 210c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek#include "clang/Lex/Preprocessor.h" 220c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek#include "llvm/Support/Compiler.h" 230c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek#include "llvm/Support/MemoryBuffer.h" 240c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek#include "llvm/ADT/StringMap.h" 250c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek#include "llvm/ADT/OwningPtr.h" 260c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 27274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenekusing namespace clang; 28274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek 290c6a77bc1f52f282a969538f139ebde429076ed3Ted KremenekPTHLexer::PTHLexer(Preprocessor& pp, SourceLocation fileloc, const char* D, 300c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek PTHManager& PM) 316183e4815a4019e97ad01bd880f12355599b75fdTed Kremenek : PreprocessorLexer(&pp, fileloc), TokBuf(D), CurTokenIdx(0), PTHMgr(PM), 320c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek NeedsFetching(true) { 330c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // Make sure the EofToken is completely clean. 340c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek EofToken.startToken(); 350c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek } 36274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek 370c6a77bc1f52f282a969538f139ebde429076ed3Ted KremenekToken PTHLexer::GetToken() { 380c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // Read the next token, or if we haven't advanced yet, get the last 390c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // token read. 400c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek if (NeedsFetching) { 410c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek NeedsFetching = false; 420c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek ReadToken(LastFetched); 430c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek } 440c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 450c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek Token Tok = LastFetched; 4689d7ee9619d2dbdfa8d956a695c612a104a92cadTed Kremenek 4789d7ee9619d2dbdfa8d956a695c612a104a92cadTed Kremenek // If we are in raw mode, zero out identifier pointers. This is 4889d7ee9619d2dbdfa8d956a695c612a104a92cadTed Kremenek // needed for 'pragma poison'. Note that this requires that the Preprocessor 4989d7ee9619d2dbdfa8d956a695c612a104a92cadTed Kremenek // can go back to the original source when it calls getSpelling(). 5089d7ee9619d2dbdfa8d956a695c612a104a92cadTed Kremenek if (LexingRawMode && Tok.is(tok::identifier)) 5189d7ee9619d2dbdfa8d956a695c612a104a92cadTed Kremenek Tok.setIdentifierInfo(0); 5289d7ee9619d2dbdfa8d956a695c612a104a92cadTed Kremenek 5389d7ee9619d2dbdfa8d956a695c612a104a92cadTed Kremenek return Tok; 5489d7ee9619d2dbdfa8d956a695c612a104a92cadTed Kremenek} 5589d7ee9619d2dbdfa8d956a695c612a104a92cadTed Kremenek 56274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenekvoid PTHLexer::Lex(Token& Tok) { 57d6f53dc4951aace69014619761760addac9e59ecTed KremenekLexNextToken: 58cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek Tok = GetToken(); 59cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek 6031aba425a01c8c957e662ccfaa71f923d0f0932aTed Kremenek if (AtLastToken()) { 61cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek Preprocessor *PPCache = PP; 62cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek 63cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek if (LexEndOfFile(Tok)) 64d6f53dc4951aace69014619761760addac9e59ecTed Kremenek return; 65274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek 66cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek assert(PPCache && "Raw buffer::LexEndOfFile should return a token"); 67cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek return PPCache->Lex(Tok); 68cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek } 69274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek 70d6f53dc4951aace69014619761760addac9e59ecTed Kremenek // Don't advance to the next token yet. Check if we are at the 71d6f53dc4951aace69014619761760addac9e59ecTed Kremenek // start of a new line and we're processing a directive. If so, we 72d6f53dc4951aace69014619761760addac9e59ecTed Kremenek // consume this token twice, once as an tok::eom. 73d6f53dc4951aace69014619761760addac9e59ecTed Kremenek if (Tok.isAtStartOfLine() && ParsingPreprocessorDirective) { 74d6f53dc4951aace69014619761760addac9e59ecTed Kremenek ParsingPreprocessorDirective = false; 75d6f53dc4951aace69014619761760addac9e59ecTed Kremenek Tok.setKind(tok::eom); 76274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek MIOpt.ReadToken(); 77274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek return; 78274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek } 79d6f53dc4951aace69014619761760addac9e59ecTed Kremenek 80d6f53dc4951aace69014619761760addac9e59ecTed Kremenek // Advance to the next token. 8131aba425a01c8c957e662ccfaa71f923d0f0932aTed Kremenek AdvanceToken(); 82d6f53dc4951aace69014619761760addac9e59ecTed Kremenek 83d6f53dc4951aace69014619761760addac9e59ecTed Kremenek if (Tok.is(tok::hash)) { 84d6f53dc4951aace69014619761760addac9e59ecTed Kremenek if (Tok.isAtStartOfLine() && !LexingRawMode) { 85d6f53dc4951aace69014619761760addac9e59ecTed Kremenek PP->HandleDirective(Tok); 86274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek 87d6f53dc4951aace69014619761760addac9e59ecTed Kremenek if (PP->isCurrentLexer(this)) 88d6f53dc4951aace69014619761760addac9e59ecTed Kremenek goto LexNextToken; 89d6f53dc4951aace69014619761760addac9e59ecTed Kremenek 90d6f53dc4951aace69014619761760addac9e59ecTed Kremenek return PP->Lex(Tok); 91d6f53dc4951aace69014619761760addac9e59ecTed Kremenek } 92274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek } 93d6f53dc4951aace69014619761760addac9e59ecTed Kremenek 94274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek MIOpt.ReadToken(); 95d6f53dc4951aace69014619761760addac9e59ecTed Kremenek 96d6f53dc4951aace69014619761760addac9e59ecTed Kremenek if (Tok.is(tok::identifier)) { 97d6f53dc4951aace69014619761760addac9e59ecTed Kremenek if (LexingRawMode) return; 98d6f53dc4951aace69014619761760addac9e59ecTed Kremenek return PP->HandleIdentifier(Tok); 99d6f53dc4951aace69014619761760addac9e59ecTed Kremenek } 100274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek} 101274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek 102cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenekbool PTHLexer::LexEndOfFile(Token &Tok) { 103cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek 104cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek if (ParsingPreprocessorDirective) { 105cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek ParsingPreprocessorDirective = false; 106cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek Tok.setKind(tok::eom); 107cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek MIOpt.ReadToken(); 108cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek return true; // Have a token. 109cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek } 110cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek 111cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek if (LexingRawMode) { 112cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek MIOpt.ReadToken(); 113cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek return true; // Have an eof token. 114cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek } 115cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek 116cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek // FIXME: Issue diagnostics similar to Lexer. 117cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek return PP->HandleEndOfFile(Tok, false); 118cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek} 119cd4e2aecde5bb7810715d5d5a88ac63ce7946f34Ted Kremenek 120274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenekvoid PTHLexer::setEOF(Token& Tok) { 1210c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek assert(!EofToken.is(tok::eof)); 1220c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek Tok = EofToken; 123274b20863a728cc6a31ee75c670e3733600c1531Ted Kremenek} 12417ff58a63197b398ae52697b088dc0fb8b255519Ted Kremenek 12517ff58a63197b398ae52697b088dc0fb8b255519Ted Kremenekvoid PTHLexer::DiscardToEndOfLine() { 12617ff58a63197b398ae52697b088dc0fb8b255519Ted Kremenek assert(ParsingPreprocessorDirective && ParsingFilename == false && 12717ff58a63197b398ae52697b088dc0fb8b255519Ted Kremenek "Must be in a preprocessing directive!"); 1284d35da2e41941965bbee8ed7e8c30e7c21000d71Ted Kremenek 1294d35da2e41941965bbee8ed7e8c30e7c21000d71Ted Kremenek // Already at end-of-file? 13031aba425a01c8c957e662ccfaa71f923d0f0932aTed Kremenek if (AtLastToken()) 1314d35da2e41941965bbee8ed7e8c30e7c21000d71Ted Kremenek return; 1324d35da2e41941965bbee8ed7e8c30e7c21000d71Ted Kremenek 1334d35da2e41941965bbee8ed7e8c30e7c21000d71Ted Kremenek // Find the first token that is not the start of the *current* line. 134d2bdeed0727c291a1a0037dc4fa80379dafa0687Ted Kremenek Token T; 135d2bdeed0727c291a1a0037dc4fa80379dafa0687Ted Kremenek for (Lex(T); !AtLastToken(); Lex(T)) 13631aba425a01c8c957e662ccfaa71f923d0f0932aTed Kremenek if (GetToken().isAtStartOfLine()) 1374d35da2e41941965bbee8ed7e8c30e7c21000d71Ted Kremenek return; 13817ff58a63197b398ae52697b088dc0fb8b255519Ted Kremenek} 1390c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 1400c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek//===----------------------------------------------------------------------===// 1410c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek// Utility methods for reading from the mmap'ed PTH file. 1420c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek//===----------------------------------------------------------------------===// 1430c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 1440c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenekstatic inline uint8_t Read8(const char*& data) { 1450c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek return (uint8_t) *(data++); 1460c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek} 1470c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 1480c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenekstatic inline uint32_t Read32(const char*& data) { 1490c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek uint32_t V = (uint32_t) Read8(data); 1500c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek V |= (((uint32_t) Read8(data)) << 8); 1510c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek V |= (((uint32_t) Read8(data)) << 16); 1520c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek V |= (((uint32_t) Read8(data)) << 24); 1530c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek return V; 1540c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek} 1550c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 1560c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek//===----------------------------------------------------------------------===// 1570c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek// Token reconstruction from the PTH file. 1580c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek//===----------------------------------------------------------------------===// 1590c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 1600c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenekvoid PTHLexer::ReadToken(Token& T) { 1610c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // Clear the token. 1620c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // FIXME: Setting the flags directly should obviate this step. 1630c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek T.startToken(); 1640c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 1650c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // Read the type of the token. 1660c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek T.setKind((tok::TokenKind) Read8(TokBuf)); 1670c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 1680c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // Set flags. This is gross, since we are really setting multiple flags. 1690c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek T.setFlag((Token::TokenFlags) Read8(TokBuf)); 1700c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 1710c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // Set the IdentifierInfo* (if any). 1720c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek T.setIdentifierInfo(PTHMgr.ReadIdentifierInfo(TokBuf)); 1730c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 1740c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // Set the SourceLocation. Since all tokens are constructed using a 1750c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // raw lexer, they will all be offseted from the same FileID. 1760c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek T.setLocation(SourceLocation::getFileLoc(FileID, Read32(TokBuf))); 1770c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 1780c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // Finally, read and set the length of the token. 1790c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek T.setLength(Read32(TokBuf)); 1800c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek} 1810c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 1820c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek//===----------------------------------------------------------------------===// 1830c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek// Internal Data Structures for PTH file lookup and resolving identifiers. 1840c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek//===----------------------------------------------------------------------===// 1850c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 1860c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 1870c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek/// PTHFileLookup - This internal data structure is used by the PTHManager 1880c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek/// to map from FileEntry objects managed by FileManager to offsets within 1890c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek/// the PTH file. 1900c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremeneknamespace { 1910c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenekclass VISIBILITY_HIDDEN PTHFileLookup { 1920c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenekpublic: 1930c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek class Val { 1940c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek uint32_t v; 1950c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 1960c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek public: 1970c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek Val() : v(~0) {} 1980c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek Val(uint32_t x) : v(x) {} 1990c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 2000c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek operator uint32_t() const { 2010c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek assert(v != ~((uint32_t)0) && "PTHFileLookup entry initialized."); 2020c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek return v; 2030c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek } 2040c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 2050c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek Val& operator=(uint32_t x) { v = x; return *this; } 2060c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek bool isValid() const { return v != ~((uint32_t)0); } 2070c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek }; 2080c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 2090c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenekprivate: 2100c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek llvm::StringMap<Val> FileMap; 2110c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 2120c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenekpublic: 2130c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek PTHFileLookup() {}; 2140c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 2150c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek Val Lookup(const FileEntry* FE) { 2160c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek const char* s = FE->getName(); 2170c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek unsigned size = strlen(s); 2180c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek return FileMap.GetOrCreateValue(s, s+size).getValue(); 2190c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek } 2200c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 2210c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek void ReadTable(const char* D) { 2220c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek uint32_t N = Read32(D); // Read the length of the table. 2230c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 2240c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek for ( ; N > 0; --N) { // The rest of the data is the table itself. 2250c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek uint32_t len = Read32(D); 2260c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek const char* s = D; 2270c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek D += len; 2280c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek FileMap.GetOrCreateValue(s, s+len).getValue() = Read32(D); 2290c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek } 2300c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek } 2310c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek}; 2320c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek} // end anonymous namespace 2330c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 2340c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek//===----------------------------------------------------------------------===// 2350c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek// PTHManager methods. 2360c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek//===----------------------------------------------------------------------===// 2370c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 2380c6a77bc1f52f282a969538f139ebde429076ed3Ted KremenekPTHManager::PTHManager(const llvm::MemoryBuffer* buf, void* fileLookup, 2396183e4815a4019e97ad01bd880f12355599b75fdTed Kremenek const char* idDataTable, void* perIDCache, 2406183e4815a4019e97ad01bd880f12355599b75fdTed Kremenek Preprocessor& pp) 2416183e4815a4019e97ad01bd880f12355599b75fdTed Kremenek: Buf(buf), PerIDCache(perIDCache), FileLookup(fileLookup), 2426183e4815a4019e97ad01bd880f12355599b75fdTed Kremenek IdDataTable(idDataTable), ITable(pp.getIdentifierTable()), PP(pp) {} 2430c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 2440c6a77bc1f52f282a969538f139ebde429076ed3Ted KremenekPTHManager::~PTHManager() { 2450c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek delete Buf; 2460c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek delete (PTHFileLookup*) FileLookup; 2470e50b6e7c104d00614baa3d80df62f1630a94d9cTed Kremenek free(PerIDCache); 2480c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek} 2490c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 2500c6a77bc1f52f282a969538f139ebde429076ed3Ted KremenekPTHManager* PTHManager::Create(const std::string& file, Preprocessor& PP) { 2510c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 2520c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // Memory map the PTH file. 2530c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek llvm::OwningPtr<llvm::MemoryBuffer> 2540c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek File(llvm::MemoryBuffer::getFile(file.c_str())); 2550c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 2560c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek if (!File) 2570c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek return 0; 2580c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 2590c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // Get the buffer ranges and check if there are at least three 32-bit 2600c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // words at the end of the file. 2610c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek const char* BufBeg = File->getBufferStart(); 2620c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek const char* BufEnd = File->getBufferEnd(); 2630c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 2640c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek if(!(BufEnd > BufBeg + sizeof(uint32_t)*3)) { 2650c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek assert(false && "Invalid PTH file."); 2660c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek return 0; // FIXME: Proper error diagnostic? 2670c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek } 2680c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 2690c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // Compute the address of the index table at the end of the PTH file. 2700c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // This table contains the offset of the file lookup table, the 2710c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // persistent ID -> identifer data table. 2720c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek const char* EndTable = BufEnd - sizeof(uint32_t)*3; 2730c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 2740c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // Construct the file lookup table. This will be used for mapping from 2750c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // FileEntry*'s to cached tokens. 2760c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek const char* FileTableOffset = EndTable + sizeof(uint32_t)*2; 2770c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek const char* FileTable = BufBeg + Read32(FileTableOffset); 2780c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 2790c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek if (!(FileTable > BufBeg && FileTable < BufEnd)) { 2800c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek assert(false && "Invalid PTH file."); 2810c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek return 0; // FIXME: Proper error diagnostic? 2820c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek } 2830c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 2840c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek llvm::OwningPtr<PTHFileLookup> FL(new PTHFileLookup()); 2850c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek FL->ReadTable(FileTable); 2860c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 2870c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // Get the location of the table mapping from persistent ids to the 2880c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // data needed to reconstruct identifiers. 2890c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek const char* IDTableOffset = EndTable + sizeof(uint32_t)*1; 2900c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek const char* IData = BufBeg + Read32(IDTableOffset); 2910c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek if (!(IData > BufBeg && IData < BufEnd)) { 2920c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek assert(false && "Invalid PTH file."); 2930c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek return 0; // FIXME: Proper error diagnostic? 2940c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek } 2950c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 2966183e4815a4019e97ad01bd880f12355599b75fdTed Kremenek // Get the number of IdentifierInfos and pre-allocate the identifier cache. 2976183e4815a4019e97ad01bd880f12355599b75fdTed Kremenek uint32_t NumIds = Read32(IData); 2986183e4815a4019e97ad01bd880f12355599b75fdTed Kremenek 2996183e4815a4019e97ad01bd880f12355599b75fdTed Kremenek // Pre-allocate the peristent ID -> IdentifierInfo* cache. We use calloc() 3006183e4815a4019e97ad01bd880f12355599b75fdTed Kremenek // so that we in the best case only zero out memory once when the OS returns 3016183e4815a4019e97ad01bd880f12355599b75fdTed Kremenek // us new pages. 3026183e4815a4019e97ad01bd880f12355599b75fdTed Kremenek IdentifierInfo** PerIDCache = 3036183e4815a4019e97ad01bd880f12355599b75fdTed Kremenek (IdentifierInfo**) calloc(NumIds, sizeof(*PerIDCache)); 3046183e4815a4019e97ad01bd880f12355599b75fdTed Kremenek 3056183e4815a4019e97ad01bd880f12355599b75fdTed Kremenek if (!PerIDCache) { 3066183e4815a4019e97ad01bd880f12355599b75fdTed Kremenek assert(false && "Could not allocate Persistent ID cache."); 3076183e4815a4019e97ad01bd880f12355599b75fdTed Kremenek return 0; 3086183e4815a4019e97ad01bd880f12355599b75fdTed Kremenek } 3096183e4815a4019e97ad01bd880f12355599b75fdTed Kremenek 3106183e4815a4019e97ad01bd880f12355599b75fdTed Kremenek // Create the new lexer. 3116183e4815a4019e97ad01bd880f12355599b75fdTed Kremenek return new PTHManager(File.take(), FL.take(), IData, PerIDCache, PP); 3120c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek} 3130c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 3140c6a77bc1f52f282a969538f139ebde429076ed3Ted KremenekIdentifierInfo* PTHManager::ReadIdentifierInfo(const char*& D) { 3150c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // Read the persistent ID from the PTH file. 3160c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek uint32_t persistentID = Read32(D); 3170c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 3180c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // A persistent ID of '0' always maps to NULL. 3190c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek if (!persistentID) 3200c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek return 0; 3210c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 3220c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // Adjust the persistent ID by subtracting '1' so that it can be used 3230c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // as an index within a table in the PTH file. 3240c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek --persistentID; 3250c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 3260c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // Check if the IdentifierInfo has already been resolved. 3276183e4815a4019e97ad01bd880f12355599b75fdTed Kremenek IdentifierInfo*& II = ((IdentifierInfo**) PerIDCache)[persistentID]; 3280c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek if (II) return II; 3290c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 3300c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // Look in the PTH file for the string data for the IdentifierInfo object. 3310c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek const char* TableEntry = IdDataTable + sizeof(uint32_t) * persistentID; 3320c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek const char* IDData = Buf->getBufferStart() + Read32(TableEntry); 3330c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek assert(IDData < Buf->getBufferEnd()); 3340c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 3350c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // Read the length of the string. 3360c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek uint32_t len = Read32(IDData); 3370c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 3380c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // Get the IdentifierInfo* with the specified string. 3390c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek II = &ITable.get(IDData, IDData+len); 3400c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek return II; 3410c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek} 3420c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 3430c6a77bc1f52f282a969538f139ebde429076ed3Ted KremenekPTHLexer* PTHManager::CreateLexer(unsigned FileID, const FileEntry* FE) { 3440c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 3450c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek if (!FE) 3460c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek return 0; 3470c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 3480c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // Lookup the FileEntry object in our file lookup data structure. It will 3490c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // return a variant that indicates whether or not there is an offset within 3500c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // the PTH file that contains cached tokens. 3510c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek PTHFileLookup::Val Off = ((PTHFileLookup*) FileLookup)->Lookup(FE); 3520c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 3530c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek if (!Off.isValid()) // No tokens available. 3540c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek return 0; 3550c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek 3560c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek // Compute the offset of the token data within the buffer. 3570c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek const char* data = Buf->getBufferStart() + Off; 3580c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek assert(data < Buf->getBufferEnd()); 3590c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek return new PTHLexer(PP, SourceLocation::getFileLoc(FileID, 0), data, *this); 3600c6a77bc1f52f282a969538f139ebde429076ed3Ted Kremenek} 361