split buffer management and diagnostic printing out of the tblgen

lexer into its own TGSourceMgr class.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66873 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 14 insertions, 48 deletions

diff --git a/utils/TableGen/TGLexer.cpp b/utils/TableGen/TGLexer.cpp
index 0d83e7cdf1..761985e410 100644
--- a/utils/TableGen/TGLexer.cpp
+++ b/utils/TableGen/TGLexer.cpp
@@ -12,6 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "TGLexer.h"
+#include "TGSourceMgr.h"
 #include "llvm/Support/Streams.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include <ostream>
@@ -23,18 +24,13 @@
 #include <cerrno>
 using namespace llvm;
 
-TGLexer::TGLexer(MemoryBuffer *StartBuf) : CurLineNo(1), CurBuf(StartBuf) {
+TGLexer::TGLexer(TGSourceMgr &SM) : SrcMgr(SM) {
+  CurBuffer = 0;
+  CurBuf = SrcMgr.getMemoryBuffer(CurBuffer);
   CurPtr = CurBuf->getBufferStart();
   TokStart = 0;
 }
 
-TGLexer::~TGLexer() {
-  while (!IncludeStack.empty()) {
-    delete IncludeStack.back().Buffer;
-    IncludeStack.pop_back();
-  }
-  delete CurBuf;
-}
 
 /// ReturnError - Set the error to the specified string at the specified
 /// location.  This is defined to always return tgtok::Error.
@@ -43,36 +39,9 @@ tgtok::TokKind TGLexer::ReturnError(const char *Loc, const std::string &Msg) {
   return tgtok::Error;
 }
 
-void TGLexer::PrintIncludeStack(std::ostream &OS) const {
-  for (unsigned i = 0, e = IncludeStack.size(); i != e; ++i)
-    OS << "Included from " << IncludeStack[i].Buffer->getBufferIdentifier()
-       << ":" << IncludeStack[i].LineNo << ":\n";
-  OS << "Parsing " << CurBuf->getBufferIdentifier() << ":"
-     << CurLineNo << ": ";
-}
 
-/// PrintError - Print the error at the specified location.
-void TGLexer::PrintError(const char *ErrorLoc,  const std::string &Msg) const {
-  PrintIncludeStack(*cerr.stream());
-  cerr << Msg << "\n";
-  assert(ErrorLoc && "Location not specified!");
-  
-  // Scan backward to find the start of the line.
-  const char *LineStart = ErrorLoc;
-  while (LineStart != CurBuf->getBufferStart() && 
-         LineStart[-1] != '\n' && LineStart[-1] != '\r')
-    --LineStart;
-  // Get the end of the line.
-  const char *LineEnd = ErrorLoc;
-  while (LineEnd != CurBuf->getBufferEnd() && 
-         LineEnd[0] != '\n' && LineEnd[0] != '\r')
-    ++LineEnd;
-  // Print out the line.
-  cerr << std::string(LineStart, LineEnd) << "\n";
-  // Print out spaces before the carat.
-  for (const char *Pos = LineStart; Pos != ErrorLoc; ++Pos)
-    cerr << (*Pos == '\t' ? '\t' : ' ');
-  cerr << "^\n";
+void TGLexer::PrintError(LocTy Loc, const std::string &Msg) const {
+  SrcMgr.PrintError(Loc, Msg);
 }
 
 int TGLexer::getNextChar() {
@@ -80,7 +49,7 @@ int TGLexer::getNextChar() {
   switch (CurChar) {
   default:
     return (unsigned char)CurChar;
-  case 0:
+  case 0: {
     // A nul character in the stream is either the end of the current buffer or
     // a random nul in the file.  Disambiguate that here.
     if (CurPtr-1 != CurBuf->getBufferEnd())
@@ -88,18 +57,18 @@ int TGLexer::getNextChar() {
     
     // If this is the end of an included file, pop the parent file off the
     // include stack.
-    if (!IncludeStack.empty()) {
-      delete CurBuf;
-      CurBuf = IncludeStack.back().Buffer;
-      CurLineNo = IncludeStack.back().LineNo;
-      CurPtr = IncludeStack.back().CurPtr;
-      IncludeStack.pop_back();
+    TGLocTy ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer);
+    if (ParentIncludeLoc != TGLocTy()) {
+      CurBuffer = SrcMgr.FindBufferContainingLoc(ParentIncludeLoc);
+      CurBuf = SrcMgr.getMemoryBuffer(CurBuffer);
+      CurPtr = ParentIncludeLoc;
       return getNextChar();
     }
     
     // Otherwise, return end of file.
     --CurPtr;  // Another call to lex will return EOF again.  
     return EOF;
+  }
   case '\n':
   case '\r':
     // Handle the newline character by ignoring it and incrementing the line
@@ -108,8 +77,6 @@ int TGLexer::getNextChar() {
     if ((*CurPtr == '\n' || (*CurPtr == '\r')) &&
         *CurPtr != CurChar)
       ++CurPtr;  // Eat the two char newline sequence.
-      
-    ++CurLineNo;
     return '\n';
   }  
 }
@@ -272,9 +239,8 @@ bool TGLexer::LexInclude() {
   }
   
   // Save the line number and lex buffer of the includer.
-  IncludeStack.push_back(IncludeRec(CurBuf, CurPtr, CurLineNo));
+  CurBuffer = SrcMgr.AddNewSourceBuffer(NewBuf, CurPtr);
   
-  CurLineNo = 1;  // Reset line numbering.
   CurBuf = NewBuf;
   CurPtr = CurBuf->getBufferStart();
   return false;