clang-rename: add a -old-name option

This is similar to -offset with the following differences:

1) -offset can refer to local variables as well.

2) -old-name makes it easier to refer to e.g. ClassName::MemberName by
spelling out the fully qualified name, instead of having to use e.g.
grep to look up the exact offset.

In other words, -offset is great when clang-rename is invoked by e.g. an
IDE, but not really user-friendly when the tool is invoked by the user
from commandline.  That's the use case where -old-name is supposed to
improve the situation.

Reviewers: klimek

Differential Revision: http://reviews.llvm.org/D21517

llvm-svn: 273304

1 files changed, 6 insertions, 1 deletions

diff --git a/clang-tools-extra/clang-rename/tool/ClangRename.cpp b/clang-tools-extra/clang-rename/tool/ClangRename.cpp
index 92cc9063475..88c25da2f13 100644
--- a/clang-tools-extra/clang-rename/tool/ClangRename.cpp
+++ b/clang-tools-extra/clang-rename/tool/ClangRename.cpp
@@ -52,6 +52,11 @@ SymbolOffset(
     "offset",
     cl::desc("Locates the symbol by offset as opposed to <line>:<column>."),
     cl::cat(ClangRenameCategory));
+static cl::opt<std::string>
+OldName(
+    "old-name",
+    cl::desc("The fully qualified name of the symbol, if -offset is not used."),
+    cl::cat(ClangRenameCategory));
 static cl::opt<bool>
 Inplace(
     "i",
@@ -96,7 +101,7 @@ int main(int argc, const char **argv) {
   // Get the USRs.
   auto Files = OP.getSourcePathList();
   tooling::RefactoringTool Tool(OP.getCompilations(), Files);
-  rename::USRFindingAction USRAction(SymbolOffset);
+  rename::USRFindingAction USRAction(SymbolOffset, OldName);
 
   // Find the USRs.
   Tool.run(tooling::newFrontendActionFactory(&USRAction).get());