[analyzer] change "tag" in ProgramPoint from "void*" to a ProgramPointTag*.

Having a notion of an actual ProgramPointTag will aid in introspection of the analyzer's behavior.
For example, the GraphViz output of the analyzer will pretty-print the tags in a useful manner.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@137529 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 27 insertions, 0 deletions

diff --git a/lib/Analysis/CMakeLists.txt b/lib/Analysis/CMakeLists.txt
index 967fc2930f..eb7e2356cd 100644
--- a/lib/Analysis/CMakeLists.txt
+++ b/lib/Analysis/CMakeLists.txt
@@ -9,6 +9,7 @@ add_clang_library(clangAnalysis
   FormatString.cpp
   LiveVariables.cpp
   PrintfFormatString.cpp
+  ProgramPoint.cpp
   PseudoConstantAnalysis.cpp
   ReachableCode.cpp
   ScanfFormatString.cpp
diff --git a/lib/Analysis/ProgramPoint.cpp b/lib/Analysis/ProgramPoint.cpp
new file mode 100644
index 0000000000..9b7df2c042
--- /dev/null
+++ b/lib/Analysis/ProgramPoint.cpp
@@ -0,0 +1,26 @@
+//==- ProgramPoint.cpp - Program Points for Path-Sensitive Analysis -*- C++ -*-/
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file defines the interface ProgramPoint, which identifies a
+//  distinct location in a function.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Analysis/ProgramPoint.h"
+
+using namespace clang;
+
+ProgramPointTag::~ProgramPointTag() {}
+
+SimpleProgramPointTag::SimpleProgramPointTag(StringRef description)
+  : desc(description) {}
+
+StringRef SimpleProgramPointTag::getTagDescription() const {
+  return desc;
+}