Refactor: Pull getImmediateMacroName() out of DiagnosticRenderer and

into Lexer and Preprocessor; making it widely available.

llvm-svn: 148410

2 files changed, 22 insertions, 30 deletions

diff --git a/clang/lib/Frontend/DiagnosticRenderer.cpp b/clang/lib/Frontend/DiagnosticRenderer.cpp
index 293ffb7a4ed..913aa82d51b 100644
--- a/clang/lib/Frontend/DiagnosticRenderer.cpp
+++ b/clang/lib/Frontend/DiagnosticRenderer.cpp
@@ -69,35 +69,6 @@ static SourceLocation getImmediateMacroCalleeLoc(const SourceManager &SM,
   return SM.getImmediateSpellingLoc(Loc);
 }
 
-/// \brief Retrieve the name of the immediate macro expansion.
-///
-/// This routine starts from a source location, and finds the name of the macro
-/// responsible for its immediate expansion. It looks through any intervening
-/// macro argument expansions to compute this. It returns a StringRef which
-/// refers to the SourceManager-owned buffer of the source where that macro
-/// name is spelled. Thus, the result shouldn't out-live that SourceManager.
-///
-static StringRef getImmediateMacroName(SourceLocation Loc,
-                                       const SourceManager &SM,
-                                       const LangOptions &LangOpts) {
-  assert(Loc.isMacroID() && "Only reasonble to call this on macros");
-  // Walk past macro argument expanions.
-  while (SM.isMacroArgExpansion(Loc))
-    Loc = SM.getImmediateExpansionRange(Loc).first;
-  
-  // Find the spelling location of the start of the non-argument expansion
-  // range. This is where the macro name was spelled in order to begin
-  // expanding this macro.
-  Loc = SM.getSpellingLoc(SM.getImmediateExpansionRange(Loc).first);
-  
-  // Dig out the buffer where the macro name was spelled and the extents of the
-  // name so that we can render it into the expansion note.
-  std::pair<FileID, unsigned> ExpansionInfo = SM.getDecomposedLoc(Loc);
-  unsigned MacroTokenLength = Lexer::MeasureTokenLength(Loc, SM, LangOpts);
-  StringRef ExpansionBuffer = SM.getBufferData(ExpansionInfo.first);
-  return ExpansionBuffer.substr(ExpansionInfo.second, MacroTokenLength);
-}
-
 /// Get the presumed location of a diagnostic message. This computes the
 /// presumed location for the top of any macro backtrace when present.
 static PresumedLoc getDiagnosticPresumedLoc(const SourceManager &SM,
@@ -289,7 +260,7 @@ void DiagnosticRenderer::emitMacroExpansionsAndCarets(
   llvm::SmallString<100> MessageStorage;
   llvm::raw_svector_ostream Message(MessageStorage);
   Message << "expanded from macro '"
-          << getImmediateMacroName(MacroLoc, SM, LangOpts) << "'";
+          << Lexer::getImmediateMacroName(MacroLoc, SM, LangOpts) << "'";
   emitDiagnostic(SM.getSpellingLoc(Loc), DiagnosticsEngine::Note,
                  Message.str(),
                  Ranges, ArrayRef<FixItHint>());
diff --git a/clang/lib/Lex/Lexer.cpp b/clang/lib/Lex/Lexer.cpp
index c320b3c222e..bb1bbbbe7e6 100644
--- a/clang/lib/Lex/Lexer.cpp
+++ b/clang/lib/Lex/Lexer.cpp
@@ -785,6 +785,27 @@ bool Lexer::isAtEndOfMacroExpansion(SourceLocation loc,
   return isAtEndOfMacroExpansion(expansionLoc, SM, LangOpts);
 }
 
+StringRef Lexer::getImmediateMacroName(SourceLocation Loc,
+                                       const SourceManager &SM,
+                                       const LangOptions &LangOpts) {
+  assert(Loc.isMacroID() && "Only reasonble to call this on macros");
+  // Walk past macro argument expanions.
+  while (SM.isMacroArgExpansion(Loc))
+    Loc = SM.getImmediateExpansionRange(Loc).first;
+
+  // Find the spelling location of the start of the non-argument expansion
+  // range. This is where the macro name was spelled in order to begin
+  // expanding this macro.
+  Loc = SM.getSpellingLoc(SM.getImmediateExpansionRange(Loc).first);
+
+  // Dig out the buffer where the macro name was spelled and the extents of the
+  // name so that we can render it into the expansion note.
+  std::pair<FileID, unsigned> ExpansionInfo = SM.getDecomposedLoc(Loc);
+  unsigned MacroTokenLength = Lexer::MeasureTokenLength(Loc, SM, LangOpts);
+  StringRef ExpansionBuffer = SM.getBufferData(ExpansionInfo.first);
+  return ExpansionBuffer.substr(ExpansionInfo.second, MacroTokenLength);
+}
+
 //===----------------------------------------------------------------------===//
 // Character information.
 //===----------------------------------------------------------------------===//