Fuzzing: add convenience mixin ldc.libfuzzer.DefineTestOneInput. (#2510)

Resolves issue #2501
ldc-developers · Mar 7, 2018 · 94f6c0e · 94f6c0e
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diff --git a/runtime/druntime b/runtime/druntime
diff --git a/tests/sanitizers/fuzz_mixin.d b/tests/sanitizers/fuzz_mixin.d
@@ -0,0 +1,24 @@
+// Test the basic fuzz target mixin for a D-signature fuzz target.
+
+// REQUIRES: atleast_llvm500
+// REQUIRES: Fuzzer
+// UNSUPPORTED: Windows
+
+// RUN: %ldc -g -fsanitize=fuzzer %s -of=%t%exe
+// RUN: not %t%exe 2>&1 | FileCheck %s
+
+int FuzzMe(in ubyte[] data)
+{
+    if ((data.length >= 3) && data[0] == 'F' && data[1] == 'U' && data[2] == 'Z')
+    {
+        // Testing this assertion also tests that druntime is initialized.
+        // CHECK: fuzz_mixin.d([[@LINE+1]]): Assertion failure
+        assert(false);
+        // CHECK: ERROR: libFuzzer: deadly signal
+    }
+
+    return 0;
+}
+
+import ldc.libfuzzer;
+mixin DefineTestOneInput!FuzzMe;