Add a basic CallGraph to Analysis.

The final graph contains a single root node, which is a parent of all externally available functions(and 'main'). As well as a list of Parentless/Unreachable functions, which are either truly unreachable or are unreachable due to our analyses imprecision.

The analyzer checkers debug.DumpCallGraph or debug.ViewGraph can be used to look at the produced graph.

Currently, the graph is not very precise, for example, it entirely skips edges resulted from ObjC method calls.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152272 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 41 insertions, 0 deletions

diff --git a/lib/StaticAnalyzer/Checkers/DebugCheckers.cpp b/lib/StaticAnalyzer/Checkers/DebugCheckers.cpp
index d7e7af1c8e..900c305543 100644
--- a/lib/StaticAnalyzer/Checkers/DebugCheckers.cpp
+++ b/lib/StaticAnalyzer/Checkers/DebugCheckers.cpp
@@ -16,6 +16,7 @@
 #include "clang/StaticAnalyzer/Core/PathSensitive/AnalysisManager.h"
 #include "clang/Analysis/Analyses/LiveVariables.h"
 #include "clang/Analysis/Analyses/Dominators.h"
+#include "clang/Analysis/CallGraph.h"
 #include "llvm/Support/Process.h"
 
 using namespace clang;
@@ -103,3 +104,43 @@ public:
 void ento::registerCFGDumper(CheckerManager &mgr) {
   mgr.registerChecker<CFGDumper>();
 }
+
+//===----------------------------------------------------------------------===//
+// CallGraphViewer
+//===----------------------------------------------------------------------===//
+
+namespace {
+class CallGraphViewer : public Checker< check::ASTDecl<TranslationUnitDecl> > {
+public:
+  void checkASTDecl(const TranslationUnitDecl *TU, AnalysisManager& mgr,
+                    BugReporter &BR) const {
+    CallGraph CG;
+    CG.addToCallGraph(const_cast<TranslationUnitDecl*>(TU));
+    CG.viewGraph();
+  }
+};
+}
+
+void ento::registerCallGraphViewer(CheckerManager &mgr) {
+  mgr.registerChecker<CallGraphViewer>();
+}
+
+//===----------------------------------------------------------------------===//
+// CallGraphDumper
+//===----------------------------------------------------------------------===//
+
+namespace {
+class CallGraphDumper : public Checker< check::ASTDecl<TranslationUnitDecl> > {
+public:
+  void checkASTDecl(const TranslationUnitDecl *TU, AnalysisManager& mgr,
+                    BugReporter &BR) const {
+    CallGraph CG;
+    CG.addToCallGraph(const_cast<TranslationUnitDecl*>(TU));
+    CG.dump();
+  }
+};
+}
+
+void ento::registerCallGraphDumper(CheckerManager &mgr) {
+  mgr.registerChecker<CallGraphDumper>();
+}