[analyzer] Add basic support for pluggable checkers.

llvm-svn: 137802

1 files changed, 52 insertions, 0 deletions

diff --git a/clang/examples/analyzer-plugin/MainCallChecker.cpp b/clang/examples/analyzer-plugin/MainCallChecker.cpp
new file mode 100644
index 00000000000..bf753899c21
--- /dev/null
+++ b/clang/examples/analyzer-plugin/MainCallChecker.cpp
@@ -0,0 +1,52 @@
+#include "clang/StaticAnalyzer/Core/Checker.h"
+#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
+#include "clang/StaticAnalyzer/Core/CheckerRegistry.h"
+#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
+
+using namespace clang;
+using namespace ento;
+
+namespace {
+class MainCallChecker : public Checker < check::PreStmt<CallExpr> > {
+  mutable llvm::OwningPtr<BugType> BT;
+
+public:
+  void checkPreStmt(const CallExpr *CE, CheckerContext &C) const;
+};
+} // end anonymous namespace
+
+void MainCallChecker::checkPreStmt(const CallExpr *CE, CheckerContext &C) const {
+  const ProgramState *state = C.getState();
+  const Expr *Callee = CE->getCallee();
+  const FunctionDecl *FD = state->getSVal(Callee).getAsFunctionDecl();
+
+  if (!FD)
+    return;
+
+  // Get the name of the callee.
+  IdentifierInfo *II = FD->getIdentifier();
+  if (!II)   // if no identifier, not a simple C function
+    return;
+
+  if (II->isStr("main")) {
+    ExplodedNode *N = C.generateSink();
+    if (!N)
+      return;
+
+    if (!BT)
+      BT.reset(new BuiltinBug("call to main"));
+
+    RangedBugReport *report = new RangedBugReport(*BT, BT->getName(), N);
+    report->addRange(Callee->getSourceRange());
+    C.EmitReport(report);    
+  }
+}
+
+// Register plugin!
+extern "C"
+void clang_registerCheckers (CheckerRegistry &registry) {
+  registry.addChecker<MainCallChecker>("example.MainCallChecker", "Disallows calls to functions called main");
+}
+
+extern "C"
+const char clang_analyzerAPIVersionString[] = CLANG_ANALYZER_API_VERSION_STRING;