tests: add basic tests for RTSan

Author: liushuyu

tests/sanitizers/lit.local.cfg

@@ -14,6 +14,11 @@ if (sys != 'FreeBSD') and (sys != 'Windows') and not (sys == 'Linux' and config.
     if 'tsan' in config.enabled_rt_libs:
         config.available_features.add('TSan')
 
+# Windows currently does not have real-time sanitizer support
+if sys != 'Windows':
+    if 'rtsan' in config.enabled_rt_libs:
+        config.available_features.add('RTSan')
+
 # FreeBSD ASan and MSan don't cope well with ASLR (might do with FreeBSD 14 according to https://github.com/llvm/llvm-project/pull/73439)
 if sys != 'FreeBSD':
     if 'asan' in config.enabled_rt_libs:

tests/sanitizers/rtsan_dmain_unsafe.d

@@ -0,0 +1,13 @@
+// Test druntime real-time violations
+
+// REQUIRES: RTSan
+
+// RUN: %ldc -g -O2 -fsanitize=realtime %s -of=%t%exe
+// RUN: not %t%exe 2>&1 | FileCheck %s
+import ldc.attributes;
+
+// CHECK: ERROR: RealtimeSanitizer: blocking-call
+void main()
+{
+    // CHECK-NEXT: Call to blocking function `rt_init`
+}

tests/sanitizers/rtsan_marked_blocking.d

@@ -0,0 +1,20 @@
+// Test simple realtime violations (marked blocking)
+
+// REQUIRES: RTSan
+
+// RUN: %ldc -g -O0 -fsanitize=realtime %s -of=%t%exe
+// RUN: not %t%exe 2>&1 | FileCheck %s
+import ldc.attributes;
+
+// CHECK: ERROR: RealtimeSanitizer: blocking-call
+@realTimeUnsafe
+int blocking_function()
+{
+    return 42;
+}
+
+extern (C) int main(int argc, char** argv)
+{
+    // CHECK: Call to blocking function `_D21rtsan_marked_blocking17blocking_functionFZi`
+    return blocking_function();
+}

tests/sanitizers/rtsan_sleep.d

@@ -0,0 +1,20 @@
+// Test simple realtime violations
+
+// REQUIRES: RTSan
+
+// RUN: %ldc -g -O0 -fsanitize=realtime %s -of=%t%exe
+// RUN: not %t%exe 2>&1 | FileCheck %s
+
+extern (C) uint sleep(uint seconds);
+
+// CHECK: ERROR: RealtimeSanitizer: unsafe-library-call
+void blocking_function()
+{
+    cast(void) sleep(3);
+}
+
+extern (C) int main(int argc, char** argv)
+{
+    blocking_function();
+    return 0;
+}