Add testcase for shift check

Validate non-optimised and optimised variant of added checks.

1 files changed, 50 insertions, 0 deletions

diff --git a/test/Feature/ShiftCheck.c b/test/Feature/ShiftCheck.c
new file mode 100644
index 00000000..326eadb2
--- /dev/null
+++ b/test/Feature/ShiftCheck.c
@@ -0,0 +1,50 @@
+// Check if shift-instructions are correctly instrumented:
+// * unoptimized code will contain a call to klee_overshift_check
+// * optimized code will have this check inlined
+// In both cases, the `ashr` instruction should have been marked with meta-data: klee.check.shift
+//
+// RUN: %llvmgcc %s -emit-llvm -g -c -o %t.bc
+// RUN: rm -rf %t.klee-out
+// RUN: %klee --output-dir=%t.klee-out --check-overshift=true %t.bc >%t.shift_enabled.log
+// RUN: FileCheck %s -input-file=%t.klee-out/assembly.ll -check-prefix=SHIFT-ENABLED
+// RUN: rm -rf %t.klee-out
+// RUN: %klee --output-dir=%t.klee-out --check-overshift=true --optimize %t.bc >%t.shift_enabled.log
+// RUN: FileCheck %s -input-file=%t.klee-out/assembly.ll -check-prefix=SHIFT-ENABLED-OPT
+// Same test 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-overshift=true %t.bc >%t.shift_enabled.log
+// RUN: FileCheck %s -input-file=%t.klee-out/assembly.ll -check-prefix=SHIFT-ENABLED
+// RUN: rm -rf %t.klee-out
+// RUN: %klee --output-dir=%t.klee-out --check-overshift=true --optimize %t.bc >%t.shift_enabled.log
+// RUN: FileCheck %s -input-file=%t.klee-out/assembly.ll -check-prefix=SHIFT-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 for klee_overshift_check call
+  // SHIFT-ENABLED: call {{.*}}void @klee_overshift_check
+  // Check that double-instrumentation does not happen
+  // SHIFT-ENABLED-NOT: call {{.*}}void @klee_overshift_check
+  // SHIFT-ENABLED: ashr {{.*}} !klee.check.shift
+  // SHIFT-ENABLED-OPT: ashr {{.*}} !klee.check.shift
+
+  // Validate
+  uint32_t value = (uint32_t)argc;
+  if (value >> 3 == 5)
+    return 1;
+  // Check that the second shift was not instrumented
+  // SHIFT-ENABLED-NOT: call {{.*}}void @klee_overshift_check(i32 i{{.+.+}} 3)
+  // SHIFT-ENABLED-NOT: ashr {{.*}} !klee.check.shift
+  // SHIFT-ENABLED-OPT-NOT: ashr {{.*}} !klee.check.shift
+
+  return 0;
+}