move include searching logic from TGLexer to SourceMgr.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73845 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/SourceMgr.h

@@ -57,12 +57,20 @@ class SourceMgr {
   /// Buffers - This is all of the buffers that we are reading from.
   std::vector<SrcBuffer> Buffers;
   
+  // IncludeDirectories - This is the list of directories we should search for
+  // include files in.
+  std::vector<std::string> IncludeDirectories;
+  
   SourceMgr(const SourceMgr&);    // DO NOT IMPLEMENT
   void operator=(const SourceMgr&); // DO NOT IMPLEMENT
 public:
   SourceMgr() {}
   ~SourceMgr();
   
+  void setIncludeDirs(const std::vector<std::string> &Dirs) {
+    IncludeDirectories = Dirs;
+  }
+  
   const SrcBuffer &getBufferInfo(unsigned i) const {
     assert(i < Buffers.size() && "Invalid Buffer ID!");
     return Buffers[i];
@@ -86,6 +94,11 @@ public:
     return Buffers.size()-1;
   }
   
+  /// AddIncludeFile - Search for a file with the specified name in the current
+  /// directory or in one of the IncludeDirs.  If no file is found, this returns
+  /// ~0, otherwise it returns the buffer ID of the stacked file.
+  unsigned AddIncludeFile(const std::string &Filename, SMLoc IncludeLoc);
+  
   /// FindBufferContainingLoc - Return the ID of the buffer containing the
   /// specified location, returning -1 if not found.
   int FindBufferContainingLoc(SMLoc Loc) const;

lib/Support/SourceMgr.cpp

@@ -25,6 +25,26 @@ SourceMgr::~SourceMgr() {
   }
 }
 
+/// AddIncludeFile - Search for a file with the specified name in the current
+/// directory or in one of the IncludeDirs.  If no file is found, this returns
+/// ~0, otherwise it returns the buffer ID of the stacked file.
+unsigned SourceMgr::AddIncludeFile(const std::string &Filename,
+                                   SMLoc IncludeLoc) {
+  
+  MemoryBuffer *NewBuf = MemoryBuffer::getFile(Filename.c_str());
+
+  // If the file didn't exist directly, see if it's in an include path.
+  for (unsigned i = 0, e = IncludeDirectories.size(); i != e && !NewBuf; ++i) {
+    std::string IncFile = IncludeDirectories[i] + "/" + Filename;
+    NewBuf = MemoryBuffer::getFile(IncFile.c_str());
+  }
+ 
+  if (NewBuf == 0) return ~0U;
+
+  return AddNewSourceBuffer(NewBuf, IncludeLoc);
+}
+
+
 /// FindBufferContainingLoc - Return the ID of the buffer containing the
 /// specified location, returning -1 if not found.
 int SourceMgr::FindBufferContainingLoc(SMLoc Loc) const {

utils/TableGen/TGLexer.cpp

@@ -278,24 +278,15 @@ bool TGLexer::LexInclude() {
   // Get the string.
   std::string Filename = CurStrVal;
 
-  // Try to find the file.
-  MemoryBuffer *NewBuf = MemoryBuffer::getFile(Filename.c_str());
-
-  // If the file didn't exist directly, see if it's in an include path.
-  for (unsigned i = 0, e = IncludeDirectories.size(); i != e && !NewBuf; ++i) {
-    std::string IncFile = IncludeDirectories[i] + "/" + Filename;
-    NewBuf = MemoryBuffer::getFile(IncFile.c_str());
-  }
-    
-  if (NewBuf == 0) {
+  
+  CurBuffer = SrcMgr.AddIncludeFile(Filename, SMLoc::getFromPointer(CurPtr));
+  if (CurBuffer == ~0U) {
     PrintError(getLoc(), "Could not find include file '" + Filename + "'");
     return true;
   }
   
   // Save the line number and lex buffer of the includer.
-  CurBuffer = SrcMgr.AddNewSourceBuffer(NewBuf, SMLoc::getFromPointer(CurPtr));
-  
-  CurBuf = NewBuf;
+  CurBuf = SrcMgr.getMemoryBuffer(CurBuffer);
   CurPtr = CurBuf->getBufferStart();
   return false;
 }

utils/TableGen/TGLexer.h

@@ -73,17 +73,10 @@ class TGLexer {
   /// by the SourceMgr object.
   int CurBuffer;
   
-  // IncludeDirectories - This is the list of directories we should search for
-  // include files in.
-  std::vector<std::string> IncludeDirectories;
 public:
   TGLexer(SourceMgr &SrcMgr);
   ~TGLexer() {}
   
-  void setIncludeDirs(const std::vector<std::string> &Dirs) {
-    IncludeDirectories = Dirs;
-  }
-  
   tgtok::TokKind Lex() {
     return CurCode = LexToken();
   }

utils/TableGen/TGParser.h

@@ -49,8 +49,6 @@ class TGParser {
 public:
   TGParser(SourceMgr &SrcMgr) : Lex(SrcMgr), CurMultiClass(0) {}
   
-  void setIncludeDirs(const std::vector<std::string> &D){Lex.setIncludeDirs(D);}
-
   /// ParseFile - Main entrypoint for parsing a tblgen file.  These parser
   /// routines return true on error, or false on success.
   bool ParseFile();

utils/TableGen/TableGen.cpp

@@ -146,12 +146,12 @@ static bool ParseFile(const std::string &Filename,
   
   // Tell SrcMgr about this buffer, which is what TGParser will pick up.
   SrcMgr.AddNewSourceBuffer(F, SMLoc());
-  
-  TGParser Parser(SrcMgr);
 
   // Record the location of the include directory so that the lexer can find
   // it later.
-  Parser.setIncludeDirs(IncludeDirs);
+  SrcMgr.setIncludeDirs(IncludeDirs);
+  
+  TGParser Parser(SrcMgr);
 
   return Parser.ParseFile();
 }