From 919c9b99e56f1ba519f21d55f2008592c4f32640 Mon Sep 17 00:00:00 2001
From: Argyrios Kyrtzidis <akyrtzi@gmail.com>
Date: Mon, 28 Feb 2011 01:27:50 +0000
Subject: [PATCH] [analyzer] Migrate DivZeroChecker to CheckerV2.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@126620 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/StaticAnalyzer/Checkers/Checkers.td       |  4 +++
 .../Checkers/DivZeroChecker.cpp               | 33 ++++++++-----------
 lib/StaticAnalyzer/Checkers/ExprEngine.cpp    |  1 -
 lib/StaticAnalyzer/Checkers/InternalChecks.h  |  1 -
 4 files changed, 18 insertions(+), 21 deletions(-)

diff --git a/lib/StaticAnalyzer/Checkers/Checkers.td b/lib/StaticAnalyzer/Checkers/Checkers.td
index 26569878c6..2f30e9d68a 100644
--- a/lib/StaticAnalyzer/Checkers/Checkers.td
+++ b/lib/StaticAnalyzer/Checkers/Checkers.td
@@ -75,6 +75,10 @@ def ObjCUnusedIvarsChecker : Checker<"UnusedIvars">,
 
 let ParentPackage = Core in {
 
+def DivZeroChecker : Checker<"DivZero">,
+  HelpText<"Check for division by zeros">,
+  DescFile<"DivZeroChecker.cpp">;
+
 def ReturnUndefChecker : Checker<"UndefReturn">,
   HelpText<"Check for undefined or garbage values being returned to the caller">,
   DescFile<"ReturnUndefChecker.cpp">;
diff --git a/lib/StaticAnalyzer/Checkers/DivZeroChecker.cpp b/lib/StaticAnalyzer/Checkers/DivZeroChecker.cpp
index 20cc904922..8a1cdef612 100644
--- a/lib/StaticAnalyzer/Checkers/DivZeroChecker.cpp
+++ b/lib/StaticAnalyzer/Checkers/DivZeroChecker.cpp
@@ -12,34 +12,25 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "InternalChecks.h"
+#include "ClangSACheckers.h"
+#include "clang/StaticAnalyzer/Core/CheckerV2.h"
+#include "clang/StaticAnalyzer/Core/CheckerManager.h"
+#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
 #include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
-#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerVisitor.h"
 
 using namespace clang;
 using namespace ento;
 
 namespace {
-class DivZeroChecker : public CheckerVisitor<DivZeroChecker> {
-  BuiltinBug *BT;
+class DivZeroChecker : public CheckerV2< check::PreStmt<BinaryOperator> > {
+  mutable llvm::OwningPtr<BuiltinBug> BT;
 public:
-  DivZeroChecker() : BT(0) {}  
-  static void *getTag();
-  void PreVisitBinaryOperator(CheckerContext &C, const BinaryOperator *B);
+  void checkPreStmt(const BinaryOperator *B, CheckerContext &C) const;
 };  
 } // end anonymous namespace
 
-void ento::RegisterDivZeroChecker(ExprEngine &Eng) {
-  Eng.registerCheck(new DivZeroChecker());
-}
-
-void *DivZeroChecker::getTag() {
-  static int x;
-  return &x;
-}
-
-void DivZeroChecker::PreVisitBinaryOperator(CheckerContext &C,
-                                            const BinaryOperator *B) {
+void DivZeroChecker::checkPreStmt(const BinaryOperator *B,
+                                  CheckerContext &C) const {
   BinaryOperator::Opcode Op = B->getOpcode();
   if (Op != BO_Div &&
       Op != BO_Rem &&
@@ -67,7 +58,7 @@ void DivZeroChecker::PreVisitBinaryOperator(CheckerContext &C,
   if (stateZero && !stateNotZero) {
     if (ExplodedNode *N = C.generateSink(stateZero)) {
       if (!BT)
-        BT = new BuiltinBug("Division by zero");
+        BT.reset(new BuiltinBug("Division by zero"));
 
       EnhancedBugReport *R = 
         new EnhancedBugReport(*BT, BT->getDescription(), N);
@@ -84,3 +75,7 @@ void DivZeroChecker::PreVisitBinaryOperator(CheckerContext &C,
   // zero denom case for now.
   C.addTransition(stateNotZero);
 }
+
+void ento::registerDivZeroChecker(CheckerManager &mgr) {
+  mgr.registerChecker<DivZeroChecker>();
+}
diff --git a/lib/StaticAnalyzer/Checkers/ExprEngine.cpp b/lib/StaticAnalyzer/Checkers/ExprEngine.cpp
index ecae1b0661..e5d080a64e 100644
--- a/lib/StaticAnalyzer/Checkers/ExprEngine.cpp
+++ b/lib/StaticAnalyzer/Checkers/ExprEngine.cpp
@@ -326,7 +326,6 @@ static void RegisterInternalChecks(ExprEngine &Eng) {
   RegisterAttrNonNullChecker(Eng);
   RegisterDereferenceChecker(Eng);
   RegisterVLASizeChecker(Eng);
-  RegisterDivZeroChecker(Eng);
 }
 
 ExprEngine::ExprEngine(AnalysisManager &mgr, TransferFuncs *tf)
diff --git a/lib/StaticAnalyzer/Checkers/InternalChecks.h b/lib/StaticAnalyzer/Checkers/InternalChecks.h
index 2ef4f51f5a..85dfe6f45d 100644
--- a/lib/StaticAnalyzer/Checkers/InternalChecks.h
+++ b/lib/StaticAnalyzer/Checkers/InternalChecks.h
@@ -26,7 +26,6 @@ void RegisterAdjustedReturnValueChecker(ExprEngine &Eng);
 void RegisterAttrNonNullChecker(ExprEngine &Eng);
 void RegisterCallAndMessageChecker(ExprEngine &Eng);
 void RegisterDereferenceChecker(ExprEngine &Eng);
-void RegisterDivZeroChecker(ExprEngine &Eng);
 void RegisterVLASizeChecker(ExprEngine &Eng);
 
 } // end GR namespace
-- 
2.40.0