From 07148eeb5ea4d1c6c51e6aa5a666811ef9f50b90 Mon Sep 17 00:00:00 2001
From: Alastair Reid <adreid@google.com>
Date: Thu, 30 Jul 2020 17:02:20 +0000
Subject: New intrinsic: klee_is_replay

This instrinsic detects whether the program is being executed
symbolically or concretely (i.e., using the libkleeRuntest library).

The intended usage (illustrated in the test program) is to
allow the test program to display the input values by invoking
any libraries it wants to.

This is especially valuable if you are constructing complex,
structured values and for languages like Rust (or C++) that have
rich libraries and print libraries.
For example, you might pick a symbolic value N with the
assumption "0 <= N < 10" and then pick N symbolic
values and write them to an array.
The resulting ktest file is a bit hard to understand compared with the
output of the standard print function in Rust/C++.
---
 runtime/Intrinsic/klee_is_replay.c | 15 +++++++++++++++
 runtime/Runtest/intrinsics.c       |  4 ++++
 2 files changed, 19 insertions(+)
 create mode 100644 runtime/Intrinsic/klee_is_replay.c

(limited to 'runtime')

diff --git a/runtime/Intrinsic/klee_is_replay.c b/runtime/Intrinsic/klee_is_replay.c
new file mode 100644
index 00000000..ac9e541d
--- /dev/null
+++ b/runtime/Intrinsic/klee_is_replay.c
@@ -0,0 +1,15 @@
+
+/*===-- klee_is_replay.c --------------------------------------------------===//
+//
+//                     The KLEE Symbolic Virtual Machine
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===*/
+
+#include "klee/klee.h"
+
+unsigned klee_is_replay() {
+  return 0;
+}
diff --git a/runtime/Runtest/intrinsics.c b/runtime/Runtest/intrinsics.c
index cdc8c9d6..f82bd554 100644
--- a/runtime/Runtest/intrinsics.c
+++ b/runtime/Runtest/intrinsics.c
@@ -146,6 +146,10 @@ uintptr_t klee_choose(uintptr_t n) {
   return x;
 }
 
+unsigned klee_is_replay() {
+  return 1;
+}
+
 void klee_assume(uintptr_t x) {
   if (!x) {
     report_internal_error("invalid klee_assume");
-- 
cgit 1.4.1