move TGSourceMgr class out of TableGen into libsupport.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73842 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 108 insertions, 0 deletions

diff --git a/include/llvm/Support/SourceMgr.h b/include/llvm/Support/SourceMgr.h
new file mode 100644
index 0000000..60bf780
--- /dev/null
+++ b/include/llvm/Support/SourceMgr.h
@@ -0,0 +1,108 @@
+//===- SourceMgr.h - Manager for Source Buffers & Diagnostics ---*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the SourceMgr class.  This class is used as a simple
+// substrate for diagnostics, #include handling, and other low level things for
+// simple parsers.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef TGSOURCEMGR_H
+#define TGSOURCEMGR_H
+
+#include <string>
+#include <vector>
+#include <cassert>
+
+namespace llvm {
+  class MemoryBuffer;
+  class TGSourceMgr;
+  
+class TGLoc {
+  const char *Ptr;
+public:
+  TGLoc() : Ptr(0) {}
+  TGLoc(const TGLoc &RHS) : Ptr(RHS.Ptr) {}
+  
+  bool operator==(const TGLoc &RHS) const { return RHS.Ptr == Ptr; }
+  bool operator!=(const TGLoc &RHS) const { return RHS.Ptr != Ptr; }
+
+  const char *getPointer() const { return Ptr; }
+  
+  static TGLoc getFromPointer(const char *Ptr) {
+    TGLoc L;
+    L.Ptr = Ptr;
+    return L;
+  }
+};
+
+/// TGSourceMgr - This owns the files read by tblgen, handles include stacks,
+/// and handles printing of diagnostics.
+class TGSourceMgr {
+  struct SrcBuffer {
+    /// Buffer - The memory buffer for the file.
+    MemoryBuffer *Buffer;
+    
+    /// IncludeLoc - This is the location of the parent include, or null if at
+    /// the top level.
+    TGLoc IncludeLoc;
+  };
+  
+  /// Buffers - This is all of the buffers that we are reading from.
+  std::vector<SrcBuffer> Buffers;
+  
+  TGSourceMgr(const TGSourceMgr&);    // DO NOT IMPLEMENT
+  void operator=(const TGSourceMgr&); // DO NOT IMPLEMENT
+public:
+  TGSourceMgr() {}
+  ~TGSourceMgr();
+  
+  const SrcBuffer &getBufferInfo(unsigned i) const {
+    assert(i < Buffers.size() && "Invalid Buffer ID!");
+    return Buffers[i];
+  }
+
+  const MemoryBuffer *getMemoryBuffer(unsigned i) const {
+    assert(i < Buffers.size() && "Invalid Buffer ID!");
+    return Buffers[i].Buffer;
+  }
+  
+  TGLoc getParentIncludeLoc(unsigned i) const {
+    assert(i < Buffers.size() && "Invalid Buffer ID!");
+    return Buffers[i].IncludeLoc;
+  }
+  
+  unsigned AddNewSourceBuffer(MemoryBuffer *F, TGLoc IncludeLoc) {
+    SrcBuffer NB;
+    NB.Buffer = F;
+    NB.IncludeLoc = IncludeLoc;
+    Buffers.push_back(NB);
+    return Buffers.size()-1;
+  }
+  
+  /// FindBufferContainingLoc - Return the ID of the buffer containing the
+  /// specified location, returning -1 if not found.
+  int FindBufferContainingLoc(TGLoc Loc) const;
+  
+  /// FindLineNumber - Find the line number for the specified location in the
+  /// specified file.  This is not a fast method.
+  unsigned FindLineNumber(TGLoc Loc, int BufferID = -1) const;
+  
+  
+  /// PrintError - Emit an error message about the specified location with the
+  /// specified string.
+  void PrintError(TGLoc ErrorLoc, const std::string &Msg) const;
+  
+private:
+  void PrintIncludeStack(TGLoc IncludeLoc) const;
+};
+  
+}  // end llvm namespace
+
+#endif