Merged @luckyluke's change for detecting overflow of unsigned add, sub

and mul operations.  Refactored tests into two main cases, and
disabled them on LLVM 2.9, which does not support -fsanitized=*signed-integer-overflow.

2 files changed, 58 insertions, 0 deletions

diff --git a/test/Feature/ubsan_signed_overflow.c b/test/Feature/ubsan_signed_overflow.c
new file mode 100644
index 00000000..9816d496
--- /dev/null
+++ b/test/Feature/ubsan_signed_overflow.c
@@ -0,0 +1,29 @@
+// RUN: %llvmgcc %s -fsanitize=signed-integer-overflow -emit-llvm -g -O0 -c -o %t.bc
+// RUN: rm -rf %t.klee-out
+// RUN: %klee --output-dir=%t.klee-out %t.bc 2>&1 | FileCheck %s
+
+// llvm-gcc 2.9 does not support -fsanitize=signed-integer-overflow
+// REQUIRES: not-llvm-2.9
+
+#include "klee/klee.h"
+
+int main()
+{
+  signed int x;
+  signed int y;
+  volatile signed int result;
+
+  klee_make_symbolic(&x, sizeof(x), "x");
+  klee_make_symbolic(&y, sizeof(y), "y");
+
+  // CHECK: ubsan_signed_overflow.c:20: overflow on unsigned addition
+  result = x + y;
+
+  // CHECK: ubsan_signed_overflow.c:23: overflow on unsigned subtraction
+  result = x - y;
+
+  // CHECK: ubsan_signed_overflow.c:26: overflow on unsigned multiplication
+  result = x * y;
+
+  return 0;
+}
diff --git a/test/Feature/ubsan_unsigned_overflow.c b/test/Feature/ubsan_unsigned_overflow.c
new file mode 100644
index 00000000..82eacdd7
--- /dev/null
+++ b/test/Feature/ubsan_unsigned_overflow.c
@@ -0,0 +1,29 @@
+// RUN: %llvmgcc %s -fsanitize=unsigned-integer-overflow -emit-llvm -g -O0 -c -o %t.bc
+// RUN: rm -rf %t.klee-out
+// RUN: %klee --output-dir=%t.klee-out %t.bc 2>&1 | FileCheck %s
+
+// llvm-gcc 2.9 does not support -fsanitize=unsigned-integer-overflow
+// REQUIRES: not-llvm-2.9
+
+#include "klee/klee.h"
+
+int main()
+{
+  unsigned int x;
+  unsigned int y;
+  volatile unsigned int result;
+
+  klee_make_symbolic(&x, sizeof(x), "x");
+  klee_make_symbolic(&y, sizeof(y), "y");
+
+  // CHECK: ubsan_unsigned_overflow.c:20: overflow on unsigned addition
+  result = x + y;
+
+  // CHECK: ubsan_unsigned_overflow.c:23: overflow on unsigned subtraction
+  result = x - y;
+
+  // CHECK: ubsan_unsigned_overflow.c:26: overflow on unsigned multiplication
+  result = x * y;
+
+  return 0;
+}