[analyzer] Add a debug checker that prints Exploded Graph

Add a debug checker that is useful to understand how the ExplodedGraph is
built; it can be triggered using the following command:

 clang -cc1 -analyze -analyzer-checker=debug.ViewExplodedGraph my_program.c

A patch by Béatrice Creusillet!

llvm-svn: 184768

2 files changed, 25 insertions, 0 deletions

diff --git a/clang/lib/StaticAnalyzer/Checkers/Checkers.td b/clang/lib/StaticAnalyzer/Checkers/Checkers.td
index fc35b223ee7..cc25ae5e8d3 100644
--- a/clang/lib/StaticAnalyzer/Checkers/Checkers.td
+++ b/clang/lib/StaticAnalyzer/Checkers/Checkers.td
@@ -538,4 +538,8 @@ def ExprInspectionChecker : Checker<"ExprInspection">,
   HelpText<"Check the analyzer's understanding of expressions">,
   DescFile<"ExprInspectionChecker.cpp">;
 
+def ExplodedGraphViewer : Checker<"ViewExplodedGraph">,
+  HelpText<"View Exploded Graphs using GraphViz">,
+  DescFile<"DebugCheckers.cpp">;
+
 } // end "debug"
diff --git a/clang/lib/StaticAnalyzer/Checkers/DebugCheckers.cpp b/clang/lib/StaticAnalyzer/Checkers/DebugCheckers.cpp
index fe12866e51c..c374d0da0e8 100644
--- a/clang/lib/StaticAnalyzer/Checkers/DebugCheckers.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/DebugCheckers.cpp
@@ -17,6 +17,8 @@
 #include "clang/Analysis/CallGraph.h"
 #include "clang/StaticAnalyzer/Core/Checker.h"
 #include "clang/StaticAnalyzer/Core/PathSensitive/AnalysisManager.h"
+#include "clang/StaticAnalyzer/Core/PathSensitive/ExplodedGraph.h"
+#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h"
 #include "llvm/Support/Process.h"
 
 using namespace clang;
@@ -179,3 +181,22 @@ public:
 void ento::registerConfigDumper(CheckerManager &mgr) {
   mgr.registerChecker<ConfigDumper>();
 }
+
+//===----------------------------------------------------------------------===//
+// ExplodedGraph Viewer
+//===----------------------------------------------------------------------===//
+
+namespace {
+class ExplodedGraphViewer : public Checker< check::EndAnalysis > {
+public:
+  ExplodedGraphViewer() {}
+  void checkEndAnalysis(ExplodedGraph &G, BugReporter &B,ExprEngine &Eng) const {
+    Eng.ViewGraph(0);
+  }
+};
+
+}
+
+void ento::registerExplodedGraphViewer(CheckerManager &mgr) {
+  mgr.registerChecker<ExplodedGraphViewer>();
+}