2008-10-21 08:54:44 +08:00
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//===--- CacheTokens.cpp - Caching of lexer tokens for PCH support --------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This provides a possible implementation of PCH support for Clang that is
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// based on caching lexed tokens and identifiers.
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//
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//===----------------------------------------------------------------------===//
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#include "clang.h"
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#include "clang/Basic/FileManager.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Basic/IdentifierTable.h"
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#include "clang/Basic/Diagnostic.h"
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#include "clang/Lex/Lexer.h"
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#include "clang/Lex/Preprocessor.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/raw_ostream.h"
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2008-12-03 03:44:08 +08:00
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#include "llvm/System/Path.h"
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2008-10-21 08:54:44 +08:00
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using namespace clang;
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2008-12-03 03:44:08 +08:00
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typedef uint32_t Offset;
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2008-12-12 07:36:38 +08:00
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typedef llvm::DenseMap<const FileEntry*,std::pair<Offset,Offset> > PCHMap;
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2008-12-03 03:44:08 +08:00
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typedef llvm::DenseMap<const IdentifierInfo*,uint32_t> IDMap;
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2008-10-21 08:54:44 +08:00
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2008-12-23 10:52:12 +08:00
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static void Emit8(llvm::raw_ostream& Out, uint32_t V) {
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Out << (unsigned char)(V);
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}
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2008-10-21 08:54:44 +08:00
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static void Emit32(llvm::raw_ostream& Out, uint32_t V) {
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Out << (unsigned char)(V);
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Out << (unsigned char)(V >> 8);
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Out << (unsigned char)(V >> 16);
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Out << (unsigned char)(V >> 24);
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}
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2008-12-23 10:52:12 +08:00
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static void Emit16(llvm::raw_ostream& Out, uint32_t V) {
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2008-10-21 08:54:44 +08:00
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Out << (unsigned char)(V);
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2008-12-23 10:52:12 +08:00
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Out << (unsigned char)(V >> 8);
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assert((V >> 16) == 0);
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2008-10-21 08:54:44 +08:00
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}
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2008-12-24 02:41:34 +08:00
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static void Emit24(llvm::raw_ostream& Out, uint32_t V) {
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Out << (unsigned char)(V);
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Out << (unsigned char)(V >> 8);
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Out << (unsigned char)(V >> 16);
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assert((V >> 24) == 0);
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}
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2008-10-21 08:54:44 +08:00
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static void EmitBuf(llvm::raw_ostream& Out, const char* I, const char* E) {
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for ( ; I != E ; ++I) Out << *I;
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}
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static uint32_t ResolveID(IDMap& IM, uint32_t& idx, const IdentifierInfo* II) {
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2008-12-03 03:44:08 +08:00
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// Null IdentifierInfo's map to the persistent ID 0.
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if (!II)
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return 0;
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2008-10-21 08:54:44 +08:00
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IDMap::iterator I = IM.find(II);
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if (I == IM.end()) {
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2008-12-03 03:44:08 +08:00
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IM[II] = ++idx; // Pre-increment since '0' is reserved for NULL.
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return idx;
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2008-10-21 08:54:44 +08:00
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}
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2008-12-03 03:44:08 +08:00
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return I->second; // We've already added 1.
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2008-10-21 08:54:44 +08:00
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}
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static void EmitToken(llvm::raw_ostream& Out, const Token& T,
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const SourceManager& SMgr,
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uint32_t& idcount, IDMap& IM) {
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2008-12-03 03:44:08 +08:00
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2008-10-21 08:54:44 +08:00
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Emit8(Out, T.getKind());
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Emit8(Out, T.getFlags());
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2008-12-24 02:41:34 +08:00
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Emit24(Out, ResolveID(IM, idcount, T.getIdentifierInfo()));
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2008-12-03 03:44:08 +08:00
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Emit32(Out, SMgr.getFullFilePos(T.getLocation()));
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2008-12-23 10:52:12 +08:00
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Emit16(Out, T.getLength());
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2008-10-21 08:54:44 +08:00
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}
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2008-11-27 07:58:26 +08:00
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struct IDData {
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const IdentifierInfo* II;
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uint32_t FileOffset;
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const IdentifierTable::const_iterator::value_type* Str;
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};
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2008-12-03 03:44:08 +08:00
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static std::pair<Offset,Offset>
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2008-11-27 07:58:26 +08:00
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EmitIdentifierTable(llvm::raw_fd_ostream& Out, uint32_t max,
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const IdentifierTable& T, const IDMap& IM) {
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2008-11-26 11:36:26 +08:00
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2008-11-27 07:58:26 +08:00
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// Build an inverse map from persistent IDs -> IdentifierInfo*.
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2008-12-03 03:44:08 +08:00
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typedef std::vector<IDData> InverseIDMap;
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2008-11-27 07:58:26 +08:00
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InverseIDMap IIDMap;
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2008-12-03 03:44:08 +08:00
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IIDMap.resize(max);
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2008-10-21 08:54:44 +08:00
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2008-11-27 07:58:26 +08:00
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// Generate mapping from persistent IDs -> IdentifierInfo*.
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2008-12-03 03:44:08 +08:00
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for (IDMap::const_iterator I=IM.begin(), E=IM.end(); I!=E; ++I) {
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// Decrement by 1 because we are using a vector for the lookup and
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// 0 is reserved for NULL.
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assert(I->second > 0);
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assert(I->second-1 < IIDMap.size());
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IIDMap[I->second-1].II = I->first;
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}
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2008-10-21 08:54:44 +08:00
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2008-11-27 07:58:26 +08:00
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// Get the string data associated with the IdentifierInfo.
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for (IdentifierTable::const_iterator I=T.begin(), E=T.end(); I!=E; ++I) {
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IDMap::const_iterator IDI = IM.find(&(I->getValue()));
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if (IDI == IM.end()) continue;
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2008-12-03 03:44:08 +08:00
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IIDMap[IDI->second-1].Str = &(*I);
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2008-11-27 07:58:26 +08:00
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}
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2008-12-03 03:44:08 +08:00
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Offset DataOff = Out.tell();
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2008-12-03 09:16:39 +08:00
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2008-11-27 07:58:26 +08:00
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for (InverseIDMap::iterator I=IIDMap.begin(), E=IIDMap.end(); I!=E; ++I) {
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2008-12-03 03:44:08 +08:00
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// Record the location for this data.
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I->FileOffset = Out.tell();
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// Write out the keyword.
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unsigned len = I->Str->getKeyLength();
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2008-10-21 08:54:44 +08:00
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Emit32(Out, len);
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2008-11-27 07:58:26 +08:00
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const char* buf = I->Str->getKeyData();
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2008-11-26 11:36:26 +08:00
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EmitBuf(Out, buf, buf+len);
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2008-10-21 08:54:44 +08:00
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}
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2008-11-26 11:36:26 +08:00
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2008-11-27 07:58:26 +08:00
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// Now emit the table mapping from persistent IDs to PTH file offsets.
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2008-12-03 03:44:08 +08:00
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Offset IDOff = Out.tell();
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2008-11-27 07:58:26 +08:00
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2008-12-03 09:16:39 +08:00
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// Emit the number of identifiers.
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Emit32(Out, max);
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2008-11-27 07:58:26 +08:00
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for (InverseIDMap::iterator I=IIDMap.begin(), E=IIDMap.end(); I!=E; ++I)
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2008-12-03 03:44:08 +08:00
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Emit32(Out, I->FileOffset);
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2008-11-27 07:58:26 +08:00
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return std::make_pair(DataOff, IDOff);
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2008-10-21 08:54:44 +08:00
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}
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2008-12-03 03:44:08 +08:00
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Offset EmitFileTable(llvm::raw_fd_ostream& Out, SourceManager& SM, PCHMap& PM) {
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2008-11-26 11:36:26 +08:00
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2008-12-03 03:44:08 +08:00
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Offset off = (Offset) Out.tell();
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2008-11-27 07:58:26 +08:00
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// Output the size of the table.
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Emit32(Out, PM.size());
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for (PCHMap::iterator I=PM.begin(), E=PM.end(); I!=E; ++I) {
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const FileEntry* FE = I->first;
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2008-12-05 06:36:44 +08:00
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const char* Name = FE->getName();
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unsigned size = strlen(Name);
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Emit32(Out, size);
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EmitBuf(Out, Name, Name+size);
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2008-12-12 07:36:38 +08:00
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Emit32(Out, I->second.first);
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Emit32(Out, I->second.second);
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2008-11-27 07:58:26 +08:00
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}
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2008-11-26 11:36:26 +08:00
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return off;
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}
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2008-12-12 07:36:38 +08:00
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static std::pair<Offset,Offset>
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LexTokens(llvm::raw_fd_ostream& Out, Lexer& L, Preprocessor& PP,
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uint32_t& idcount, IDMap& IM) {
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2008-11-26 11:36:26 +08:00
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// Record the location within the token file.
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2008-12-03 03:44:08 +08:00
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Offset off = (Offset) Out.tell();
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SourceManager& SMgr = PP.getSourceManager();
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2008-12-12 07:36:38 +08:00
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// Keep track of matching '#if' ... '#endif'.
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typedef std::vector<std::pair<Offset, unsigned> > PPCondTable;
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PPCondTable PPCond;
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2008-12-13 02:31:09 +08:00
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std::vector<unsigned> PPStartCond;
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2008-12-23 09:30:52 +08:00
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bool ParsingPreprocessorDirective = false;
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2008-11-26 11:36:26 +08:00
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Token Tok;
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do {
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L.LexFromRawLexer(Tok);
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2008-12-23 09:30:52 +08:00
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if ((Tok.isAtStartOfLine() || Tok.is(tok::eof)) &&
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ParsingPreprocessorDirective) {
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// Insert an eom token into the token cache. It has the same
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// position as the next token that is not on the same line as the
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// preprocessor directive. Observe that we continue processing
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// 'Tok' when we exit this branch.
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Token Tmp = Tok;
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Tmp.setKind(tok::eom);
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Tmp.clearFlag(Token::StartOfLine);
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Tmp.setIdentifierInfo(0);
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EmitToken(Out, Tmp, SMgr, idcount, IM);
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ParsingPreprocessorDirective = false;
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}
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2008-11-26 11:36:26 +08:00
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if (Tok.is(tok::identifier)) {
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Tok.setIdentifierInfo(PP.LookUpIdentifierInfo(Tok));
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2008-12-23 09:30:52 +08:00
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continue;
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2008-11-26 11:36:26 +08:00
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}
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2008-12-23 09:30:52 +08:00
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if (Tok.is(tok::hash) && Tok.isAtStartOfLine()) {
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2008-11-26 11:36:26 +08:00
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// Special processing for #include. Store the '#' token and lex
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// the next token.
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2008-12-23 09:30:52 +08:00
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assert(!ParsingPreprocessorDirective);
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2008-12-12 07:36:38 +08:00
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Offset HashOff = (Offset) Out.tell();
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2008-12-03 03:44:08 +08:00
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EmitToken(Out, Tok, SMgr, idcount, IM);
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2008-12-13 02:31:09 +08:00
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// Get the next token.
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2008-11-26 11:36:26 +08:00
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L.LexFromRawLexer(Tok);
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2008-12-23 09:30:52 +08:00
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assert(!Tok.isAtStartOfLine());
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2008-11-26 11:36:26 +08:00
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// Did we see 'include'/'import'/'include_next'?
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if (!Tok.is(tok::identifier))
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continue;
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IdentifierInfo* II = PP.LookUpIdentifierInfo(Tok);
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Tok.setIdentifierInfo(II);
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tok::PPKeywordKind K = II->getPPKeywordID();
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2008-12-23 09:30:52 +08:00
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assert(K != tok::pp_not_keyword);
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ParsingPreprocessorDirective = true;
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switch (K) {
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default:
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break;
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case tok::pp_include:
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case tok::pp_import:
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case tok::pp_include_next: {
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2008-11-26 11:36:26 +08:00
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// Save the 'include' token.
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2008-12-03 03:44:08 +08:00
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EmitToken(Out, Tok, SMgr, idcount, IM);
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2008-11-26 11:36:26 +08:00
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// Lex the next token as an include string.
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L.setParsingPreprocessorDirective(true);
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L.LexIncludeFilename(Tok);
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L.setParsingPreprocessorDirective(false);
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2008-12-23 09:30:52 +08:00
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assert(!Tok.isAtStartOfLine());
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2008-11-26 11:36:26 +08:00
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if (Tok.is(tok::identifier))
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Tok.setIdentifierInfo(PP.LookUpIdentifierInfo(Tok));
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2008-12-23 09:30:52 +08:00
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break;
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2008-11-26 11:36:26 +08:00
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}
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2008-12-23 09:30:52 +08:00
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case tok::pp_if:
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case tok::pp_ifdef:
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case tok::pp_ifndef: {
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2008-12-12 07:36:38 +08:00
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// Ad an entry for '#if' and friends. We initially set the target index
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// to 0. This will get backpatched when we hit #endif.
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PPStartCond.push_back(PPCond.size());
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2008-12-13 02:31:09 +08:00
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PPCond.push_back(std::make_pair(HashOff, 0U));
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2008-12-23 09:30:52 +08:00
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break;
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2008-12-12 07:36:38 +08:00
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}
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2008-12-23 09:30:52 +08:00
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case tok::pp_endif: {
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2008-12-12 07:36:38 +08:00
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// Add an entry for '#endif'. We set the target table index to itself.
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2008-12-13 02:31:09 +08:00
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// This will later be set to zero when emitting to the PTH file. We
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// use 0 for uninitialized indices because that is easier to debug.
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2008-12-12 07:36:38 +08:00
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unsigned index = PPCond.size();
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// Backpatch the opening '#if' entry.
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2008-12-13 02:31:09 +08:00
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assert(!PPStartCond.empty());
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assert(PPCond.size() > PPStartCond.back());
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2008-12-12 07:36:38 +08:00
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assert(PPCond[PPStartCond.back()].second == 0);
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PPCond[PPStartCond.back()].second = index;
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PPStartCond.pop_back();
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2008-12-13 02:31:09 +08:00
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// Add the new entry to PPCond.
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PPCond.push_back(std::make_pair(HashOff, index));
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2008-12-23 09:30:52 +08:00
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break;
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2008-12-12 07:36:38 +08:00
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}
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2008-12-23 09:30:52 +08:00
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case tok::pp_elif:
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case tok::pp_else: {
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// Add an entry for #elif or #else.
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2008-12-13 02:31:09 +08:00
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// This serves as both a closing and opening of a conditional block.
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// This means that its entry will get backpatched later.
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2008-12-12 07:36:38 +08:00
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unsigned index = PPCond.size();
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// Backpatch the previous '#if' entry.
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2008-12-13 02:31:09 +08:00
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assert(!PPStartCond.empty());
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assert(PPCond.size() > PPStartCond.back());
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2008-12-12 07:36:38 +08:00
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assert(PPCond[PPStartCond.back()].second == 0);
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PPCond[PPStartCond.back()].second = index;
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PPStartCond.pop_back();
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// Now add '#elif' as a new block opening.
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2008-12-13 02:31:09 +08:00
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PPCond.push_back(std::make_pair(HashOff, 0U));
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PPStartCond.push_back(index);
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2008-12-23 09:30:52 +08:00
|
|
|
break;
|
|
|
|
}
|
2008-12-12 07:36:38 +08:00
|
|
|
}
|
2008-11-26 11:36:26 +08:00
|
|
|
}
|
|
|
|
}
|
2008-12-03 03:44:08 +08:00
|
|
|
while (EmitToken(Out, Tok, SMgr, idcount, IM), Tok.isNot(tok::eof));
|
2008-12-12 07:36:38 +08:00
|
|
|
|
2008-12-13 02:31:09 +08:00
|
|
|
assert(PPStartCond.empty() && "Error: imblanced preprocessor conditionals.");
|
|
|
|
|
2008-12-12 07:36:38 +08:00
|
|
|
// Next write out PPCond.
|
|
|
|
Offset PPCondOff = (Offset) Out.tell();
|
2008-12-13 02:31:09 +08:00
|
|
|
|
|
|
|
// Write out the size of PPCond so that clients can identifer empty tables.
|
2008-12-12 07:36:38 +08:00
|
|
|
Emit32(Out, PPCond.size());
|
2008-12-03 03:44:08 +08:00
|
|
|
|
2008-12-13 02:31:09 +08:00
|
|
|
for (unsigned i = 0, e = PPCond.size(); i!=e; ++i) {
|
|
|
|
Emit32(Out, PPCond[i].first - off);
|
|
|
|
uint32_t x = PPCond[i].second;
|
|
|
|
assert(x != 0 && "PPCond entry not backpatched.");
|
|
|
|
// Emit zero for #endifs. This allows us to do checking when
|
|
|
|
// we read the PTH file back in.
|
|
|
|
Emit32(Out, x == i ? 0 : x);
|
2008-12-12 07:36:38 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
return std::make_pair(off,PPCondOff);
|
2008-11-26 11:36:26 +08:00
|
|
|
}
|
2008-10-21 08:54:44 +08:00
|
|
|
|
|
|
|
void clang::CacheTokens(Preprocessor& PP, const std::string& OutFile) {
|
|
|
|
// Lex through the entire file. This will populate SourceManager with
|
|
|
|
// all of the header information.
|
|
|
|
Token Tok;
|
|
|
|
PP.EnterMainSourceFile();
|
|
|
|
do { PP.Lex(Tok); } while (Tok.isNot(tok::eof));
|
|
|
|
|
|
|
|
// Iterate over all the files in SourceManager. Create a lexer
|
|
|
|
// for each file and cache the tokens.
|
|
|
|
SourceManager& SM = PP.getSourceManager();
|
|
|
|
const LangOptions& LOpts = PP.getLangOptions();
|
|
|
|
llvm::raw_ostream& os = llvm::errs();
|
|
|
|
|
|
|
|
PCHMap PM;
|
|
|
|
IDMap IM;
|
|
|
|
uint32_t idcount = 0;
|
|
|
|
|
|
|
|
std::string ErrMsg;
|
2008-11-13 13:09:21 +08:00
|
|
|
llvm::raw_fd_ostream Out(OutFile.c_str(), true, ErrMsg);
|
2008-10-21 08:54:44 +08:00
|
|
|
|
|
|
|
if (!ErrMsg.empty()) {
|
2008-12-03 03:44:08 +08:00
|
|
|
os << "PTH error: " << ErrMsg << "\n";
|
2008-10-21 08:54:44 +08:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
for (SourceManager::fileid_iterator I=SM.fileid_begin(), E=SM.fileid_end();
|
|
|
|
I!=E; ++I) {
|
|
|
|
|
|
|
|
const SrcMgr::ContentCache* C = I.getFileIDInfo().getContentCache();
|
2008-11-26 11:36:26 +08:00
|
|
|
if (!C) continue;
|
2008-11-26 08:57:55 +08:00
|
|
|
|
2008-11-26 11:36:26 +08:00
|
|
|
const FileEntry* FE = C->Entry; // Does this entry correspond to a file?
|
|
|
|
if (!FE) continue;
|
2008-12-03 03:44:08 +08:00
|
|
|
|
|
|
|
// FIXME: Handle files with non-absolute paths.
|
|
|
|
llvm::sys::Path P(FE->getName());
|
|
|
|
if (!P.isAbsolute())
|
|
|
|
continue;
|
2008-11-26 11:36:26 +08:00
|
|
|
|
|
|
|
PCHMap::iterator PI = PM.find(FE); // Have we already processed this file?
|
|
|
|
if (PI != PM.end()) continue;
|
2008-10-21 08:54:44 +08:00
|
|
|
|
2009-01-06 12:47:20 +08:00
|
|
|
const llvm::MemoryBuffer* B = C->getBuffer();
|
2008-11-26 11:36:26 +08:00
|
|
|
if (!B) continue;
|
2008-10-21 08:54:44 +08:00
|
|
|
|
|
|
|
Lexer L(SourceLocation::getFileLoc(I.getFileID(), 0), LOpts,
|
|
|
|
B->getBufferStart(), B->getBufferEnd(), B);
|
2008-12-12 07:36:38 +08:00
|
|
|
|
2008-11-26 11:36:26 +08:00
|
|
|
PM[FE] = LexTokens(Out, L, PP, idcount, IM);
|
2008-11-26 10:18:33 +08:00
|
|
|
}
|
2008-11-26 11:36:26 +08:00
|
|
|
|
|
|
|
// Write out the identifier table.
|
2008-12-03 03:44:08 +08:00
|
|
|
std::pair<Offset,Offset> IdTableOff =
|
2008-11-27 07:58:26 +08:00
|
|
|
EmitIdentifierTable(Out, idcount, PP.getIdentifierTable(), IM);
|
2008-11-26 11:36:26 +08:00
|
|
|
|
|
|
|
// Write out the file table.
|
2008-12-03 03:44:08 +08:00
|
|
|
Offset FileTableOff = EmitFileTable(Out, SM, PM);
|
2008-10-21 08:54:44 +08:00
|
|
|
|
2008-11-26 11:36:26 +08:00
|
|
|
// Finally, write out the offset table at the end.
|
2008-12-03 03:44:08 +08:00
|
|
|
Emit32(Out, IdTableOff.first);
|
|
|
|
Emit32(Out, IdTableOff.second);
|
|
|
|
Emit32(Out, FileTableOff);
|
2008-10-21 08:54:44 +08:00
|
|
|
}
|