From c6fe32a91c7372caf09152ee31a24c4b5d24deed Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sat, 17 Jan 2009 03:48:08 +0000
Subject: [PATCH] Instead of iterating over FileID's, have PTH generation
 iterate over the content cache directly.  Content cache has a 1-1 mapping
 with fileentries, whereas multiple FileIDs can be the same FileEntry.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@62401 91177308-0d34-0410-b5e6-96231b3b80d8
---
 Driver/CacheTokens.cpp              | 24 ++++++++++-------------
 include/clang/Basic/SourceManager.h | 30 +++++------------------------
 lib/Lex/Lexer.cpp                   |  3 +--
 3 files changed, 16 insertions(+), 41 deletions(-)

diff --git a/Driver/CacheTokens.cpp b/Driver/CacheTokens.cpp
index d791e09d6c..33986f8254 100644
--- a/Driver/CacheTokens.cpp
+++ b/Driver/CacheTokens.cpp
@@ -467,17 +467,13 @@ void PTHWriter::EmitCachedSpellings() {
 void PTHWriter::GeneratePTH() {
   // 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();
+  SourceManager &SM = PP.getSourceManager();
+  const LangOptions &LOpts = PP.getLangOptions();
   
-  for (SourceManager::fileid_iterator I=SM.fileid_begin(), E=SM.fileid_end();
-       I!=E; ++I) {
-    
-    const SrcMgr::ContentCache* C = I.getFileIDInfo().getContentCache();
-    if (!C) continue;
-
-    const FileEntry* FE = C->Entry;    // Does this entry correspond to a file?    
-    if (!FE) continue;
+  for (SourceManager::fileinfo_iterator I = SM.fileinfo_begin(),
+       E = SM.fileinfo_end(); I != E; ++I) {
+    const SrcMgr::ContentCache &C = *I;
+    const FileEntry *FE = C.Entry;
     
     // FIXME: Handle files with non-absolute paths.
     llvm::sys::Path P(FE->getName());
@@ -487,12 +483,12 @@ void PTHWriter::GeneratePTH() {
     PCHMap::iterator PI = PM.find(FE); // Have we already processed this file?
     if (PI != PM.end()) continue;
     
-    const llvm::MemoryBuffer* B = C->getBuffer();
+    const llvm::MemoryBuffer *B = C.getBuffer();
     if (!B) continue;
-    
-    Lexer L(SourceLocation::getFileLoc(I.getFileID(), 0), LOpts,
-            B->getBufferStart(), B->getBufferEnd(), B);
 
+    unsigned FID = SM.createFileID(FE, SourceLocation(), SrcMgr::C_User);
+    Lexer L(SourceLocation::getFileLoc(FID, 0), LOpts,
+            B->getBufferStart(), B->getBufferEnd(), B);
     PM[FE] = LexTokens(L);
   }
 
diff --git a/include/clang/Basic/SourceManager.h b/include/clang/Basic/SourceManager.h
index 1eac4f15de..9a67627485 100644
--- a/include/clang/Basic/SourceManager.h
+++ b/include/clang/Basic/SourceManager.h
@@ -478,31 +478,11 @@ public:
     return getFIDInfo(FileID)->getFileCharacteristic();
   }
   
-  // Iterators over FileIDs.
-  
-  class fileid_iterator {
-    std::vector<SrcMgr::FileIDInfo>::iterator I;
-    unsigned fid;
-  public:
-    fileid_iterator(std::vector<SrcMgr::FileIDInfo>::iterator i, unsigned f)
-      : I(i), fid(f) {}
-    
-    bool operator==(const fileid_iterator& X) const { return X.fid == fid; }
-    bool operator!=(const fileid_iterator& X) const { return X.fid != fid; }
-    fileid_iterator& operator++() { ++fid; ++I; return *this; }
-    
-    unsigned getFileID() const { return fid; }
-    SrcMgr::FileIDInfo& getFileIDInfo() { return *I; }
-  };
-  
-  fileid_iterator fileid_begin() {
-    return fileid_iterator(FileIDs.begin(), 1);
-  }
-  
-  fileid_iterator fileid_end() {
-    return fileid_iterator(FileIDs.end(), FileIDs.size()+1);
-  }
-  
+  // Iterators over FileInfos.
+  typedef std::set<SrcMgr::ContentCache>::const_iterator fileinfo_iterator;
+  fileinfo_iterator fileinfo_begin() const { return FileInfos.begin(); }
+  fileinfo_iterator fileinfo_end() const { return FileInfos.end(); }
+
   /// PrintStats - Print statistics to stderr.
   ///
   void PrintStats() const;
diff --git a/lib/Lex/Lexer.cpp b/lib/Lex/Lexer.cpp
index fa29d0a38e..5a14c1356a 100644
--- a/lib/Lex/Lexer.cpp
+++ b/lib/Lex/Lexer.cpp
@@ -112,8 +112,7 @@ Lexer::Lexer(SourceLocation fileloc, Preprocessor &pp,
 Lexer::Lexer(SourceLocation fileloc, const LangOptions &features,
              const char *BufStart, const char *BufEnd,
              const llvm::MemoryBuffer *FromFile)
-  : PreprocessorLexer(), FileLoc(fileloc),
-    Features(features) {
+  : FileLoc(fileloc), Features(features) {
       
   Is_PragmaLexer = false;
   InitCharacterInfo();
-- 
2.40.0