enhance SMDiagnostic to also maintain a pointer to the SourceMgr.

Add a simplified constructor for clients that don't have locations
like "file not found" errors.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100538 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/IRReader.h

@@ -38,8 +38,7 @@ namespace llvm {
       std::string ErrMsg;
       Module *M = getLazyBitcodeModule(Buffer, Context, &ErrMsg);
       if (M == 0) {
-        Err = SMDiagnostic(SMLoc(), Buffer->getBufferIdentifier(), -1, -1,
-                           ErrMsg, "");
+        Err = SMDiagnostic(Buffer->getBufferIdentifier(), ErrMsg);
         // ParseBitcodeFile does not take ownership of the Buffer in the
         // case of an error.
         delete Buffer;
@@ -60,8 +59,8 @@ namespace llvm {
     std::string ErrMsg;
     MemoryBuffer *F = MemoryBuffer::getFileOrSTDIN(Filename.c_str(), &ErrMsg);
     if (F == 0) {
-      Err = SMDiagnostic(SMLoc(), Filename, -1, -1,
-                         "Could not open input file '" + Filename + "'", "");
+      Err = SMDiagnostic(Filename, 
+                         "Could not open input file '" + Filename + "'");
       return 0;
     }
 
@@ -82,8 +81,7 @@ namespace llvm {
       // ParseBitcodeFile does not take ownership of the Buffer.
       delete Buffer;
       if (M == 0)
-        Err = SMDiagnostic(SMLoc(), Buffer->getBufferIdentifier(),
-                           -1, -1, ErrMsg, "");
+        Err = SMDiagnostic(Buffer->getBufferIdentifier(), ErrMsg);
       return M;
     }
 
@@ -99,8 +97,8 @@ namespace llvm {
     std::string ErrMsg;
     MemoryBuffer *F = MemoryBuffer::getFileOrSTDIN(Filename.c_str(), &ErrMsg);
     if (F == 0) {
-      Err = SMDiagnostic(SMLoc(), Filename, -1, -1,
-                         "Could not open input file '" + Filename + "'", "");
+      Err = SMDiagnostic(Filename, 
+                         "Could not open input file '" + Filename + "'");
       return 0;
     }
 

include/llvm/Support/SourceMgr.h

@@ -148,6 +148,7 @@ private:
 /// SMDiagnostic - Instances of this class encapsulate one diagnostic report,
 /// allowing printing to a raw_ostream as a caret diagnostic.
 class SMDiagnostic {
+  const SourceMgr *SM;
   SMLoc Loc;
   std::string Filename;
   int LineNo, ColumnNo;
@@ -155,13 +156,23 @@ class SMDiagnostic {
   unsigned ShowLine : 1;
 
 public:
-  SMDiagnostic() : LineNo(0), ColumnNo(0), ShowLine(0) {}
-  SMDiagnostic(SMLoc L, const std::string &FN, int Line, int Col,
+  // Null diagnostic.
+  SMDiagnostic() : SM(0), LineNo(0), ColumnNo(0), ShowLine(0) {}
+  // Diagnostic with no location (e.g. file not found, command line arg error).
+  SMDiagnostic(const std::string &filename, const std::string &Msg,
+               bool showline = true)
+    : SM(0), Loc(), Filename(filename), LineNo(-1), ColumnNo(-1),
+      Message(Msg), LineContents(""), ShowLine(showline) {}
+  
+  // Diagnostic with a location.
+  SMDiagnostic(const SourceMgr &sm, SMLoc L, const std::string &FN,
+               int Line, int Col,
                const std::string &Msg, const std::string &LineStr,
                bool showline = true)
-    : Loc(L), Filename(FN), LineNo(Line), ColumnNo(Col), Message(Msg),
+    : SM(&sm), Loc(L), Filename(FN), LineNo(Line), ColumnNo(Col), Message(Msg),
       LineContents(LineStr), ShowLine(showline) {}
 
+  const SourceMgr *getSourceMgr() const { return SM; }
   SMLoc getLoc() const { return Loc; }
   const std::string getFilename() { return Filename; }
   int getLineNo() const { return LineNo; }

lib/AsmParser/Parser.cpp

@@ -44,9 +44,9 @@ Module *llvm::ParseAssemblyFile(const std::string &Filename, SMDiagnostic &Err,
   std::string ErrorStr;
   MemoryBuffer *F = MemoryBuffer::getFileOrSTDIN(Filename.c_str(), &ErrorStr);
   if (F == 0) {
-    Err = SMDiagnostic(SMLoc(), "", -1, -1,
+    Err = SMDiagnostic(Filename,
                        "Could not open input file '" + Filename + "': " +
-                       ErrorStr, "");
+                       ErrorStr);
     return 0;
   }
 

lib/Support/SourceMgr.cpp

@@ -168,7 +168,7 @@ SMDiagnostic SourceMgr::GetMessage(SMLoc Loc, const std::string &Msg,
   }
   PrintedMsg += Msg;
 
-  return SMDiagnostic(Loc,
+  return SMDiagnostic(*this, Loc,
                       CurMB->getBufferIdentifier(), FindLineNumber(Loc, CurBuf),
                       Loc.getPointer()-LineStart, PrintedMsg,
                       LineStr, ShowLine);