Add test case for div checker

Check that only important div instructions are annotated.
Check the optimized case as well: the call to the validating function
might not be part of the code anymore but already inlined - make sure
the instruction still has the metadata attached.

1 files changed, 48 insertions, 0 deletions

diff --git a/test/Feature/DivCheck.c b/test/Feature/DivCheck.c
new file mode 100644
index 00000000..219648a9
--- /dev/null
+++ b/test/Feature/DivCheck.c
@@ -0,0 +1,48 @@
+// Check if div-instructions are correctly instrumented:
+// * unoptimized code will contain a call to klee_div_zero_check
+// * optimized code will have this check inlined
+// In both cases, the `div` instruction should have been marked with meta-data: klee.check.div
+//
+// RUN: %llvmgcc %s -emit-llvm -g -c -o %t.bc
+// RUN: rm -rf %t.klee-out
+// RUN: %klee --output-dir=%t.klee-out --check-div-zero=true %t.bc >%t.div_enabled.log
+// RUN: FileCheck %s -input-file=%t.klee-out/assembly.ll -check-prefix=DIV-ENABLED
+// RUN: rm -rf %t.klee-out
+// RUN: %klee --output-dir=%t.klee-out --check-div-zero=true --optimize %t.bc >%t.div_enabled.log
+// RUN: FileCheck %s -input-file=%t.klee-out/assembly.ll -check-prefix=DIV-ENABLED-OPT
+// Without debug information
+// RUN: %llvmgcc %s -emit-llvm -c -o %t.bc
+// RUN: rm -rf %t.klee-out
+// RUN: %klee --output-dir=%t.klee-out --check-div-zero=true %t.bc >%t.div_enabled.log
+// RUN: FileCheck %s -input-file=%t.klee-out/assembly.ll -check-prefix=DIV-ENABLED
+// RUN: rm -rf %t.klee-out
+// RUN: %klee --output-dir=%t.klee-out --check-div-zero=true --optimize %t.bc >%t.div_enabled.log
+// RUN: FileCheck %s -input-file=%t.klee-out/assembly.ll -check-prefix=DIV-ENABLED-OPT
+#include "klee/klee.h"
+#include <stdio.h>
+
+int main(int argc, char **argv) {
+  char c;
+
+  klee_make_symbolic(&c, sizeof(c), "index");
+
+  // Validate
+  if (argc / c == 5)
+    return 1;
+  // Check that div has been instrumented once
+  // DIV-ENABLED: call {{.*}}void @klee_div_zero_check({{.+}} %{{.+}})
+  // DIV-ENABLED-NOT: call {{.*}}void @klee_div_zero_check
+  // Check that div has the proper metadata
+  // DIV-ENABLED: sdiv {{.*}} !klee.check.div
+  // DIV-ENABLED-OPT: sdiv {{.*}} !klee.check.div
+
+  // Validate
+  if (argc / 5 == 5)
+    return 1;
+  // Check that div has not been instrumented
+  // DIV-ENABLED-NOT: call {{.*}}void @klee_div_zero_check(i64 5)
+  // DIV-ENABLED-NOT: sdiv {{.*}} !klee.check.div
+  // DIV-ENABLED-OPT-NOT: sdiv {{.*}} !klee.check.div
+
+  return 0;
+}