From 714dc22ccb12efdc203e8ce92d6e546ca9ffb157 Mon Sep 17 00:00:00 2001
From: Luca Dariz <l.dariz@imamoter.cnr.t>
Date: Thu, 20 Nov 2014 12:41:12 +0100
Subject: refactor integer overflow detection, add signed int

Instead of checking for every possible casse which result in overflow,
it is much simpler to perform the operation using integers with bigger
dimension and check if the result overflow
---
 lib/Core/SpecialFunctionHandler.cpp | 9 +++++++++
 lib/Core/SpecialFunctionHandler.h   | 1 +
 2 files changed, 10 insertions(+)

(limited to 'lib/Core')

diff --git a/lib/Core/SpecialFunctionHandler.cpp b/lib/Core/SpecialFunctionHandler.cpp
index 04a82cf7..f06ae4f5 100644
--- a/lib/Core/SpecialFunctionHandler.cpp
+++ b/lib/Core/SpecialFunctionHandler.cpp
@@ -112,6 +112,7 @@ static SpecialFunctionHandler::HandlerInfo handlerInfo[] = {
   add("__ubsan_handle_add_overflow", handleAddOverflow, false),
   add("__ubsan_handle_sub_overflow", handleSubOverflow, false),
   add("__ubsan_handle_mul_overflow", handleMulOverflow, false),
+  add("__ubsan_handle_divrem_overflow", handleDivRemOverflow, false),
 
 #undef addDNR
 #undef add  
@@ -736,3 +737,11 @@ void SpecialFunctionHandler::handleMulOverflow(ExecutionState &state,
                                  "overflow on unsigned multiplication",
                                  "overflow.err");
 }
+
+void SpecialFunctionHandler::handleDivRemOverflow(ExecutionState &state,
+                                               KInstruction *target,
+                                               std::vector<ref<Expr> > &arguments) {
+  executor.terminateStateOnError(state,
+                                 "overflow on division or remainder",
+                                 "overflow.err");
+}
diff --git a/lib/Core/SpecialFunctionHandler.h b/lib/Core/SpecialFunctionHandler.h
index 601b149b..d52b8fc5 100644
--- a/lib/Core/SpecialFunctionHandler.h
+++ b/lib/Core/SpecialFunctionHandler.h
@@ -135,6 +135,7 @@ namespace klee {
     HANDLER(handleAddOverflow);
     HANDLER(handleMulOverflow);
     HANDLER(handleSubOverflow);
+    HANDLER(handleDivRemOverflow);
 #undef HANDLER
   };
 } // End klee namespace
-- 
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