ART: Move runtime-debug flags to own files

To reduce the need for base/logging.h and separate out concerns.

Test: m
Change-Id: Ib373357325c6e622f608ada341594c3bea2fce2e

1 files changed, 61 insertions, 0 deletions

diff --git a/runtime/base/runtime_debug.h b/runtime/base/runtime_debug.h
new file mode 100644
index 0000000000..89a0361fa7
--- /dev/null
+++ b/runtime/base/runtime_debug.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_RUNTIME_BASE_RUNTIME_DEBUG_H_
+#define ART_RUNTIME_BASE_RUNTIME_DEBUG_H_
+
+namespace art {
+
+// Runtime debug flags are flags that have a runtime component, that is, their value can be changed.
+// This is meant to implement fast vs slow debug builds, in that certain debug flags can be turned
+// on and off. To that effect, expose two macros to help implement and globally drive these flags:
+//
+// In the header, declare a (class) flag like this:
+//
+//   class C {
+//     DECLARE_RUNTIME_DEBUG_FLAG(kFlag);
+//   };
+//
+// This will declare a flag kFlag that is a constexpr false in release builds, and a static field
+// in debug builds. Usage is than uniform as C::kFlag.
+//
+// In the cc file, define the flag like this:
+//
+//   DEFINE_RUNTIME_DEBUG_FLAG(C, kFlag);
+//
+// This will define the static storage, as necessary, and register the flag with the runtime
+// infrastructure to toggle the value.
+
+#ifdef NDEBUG
+#define DECLARE_RUNTIME_DEBUG_FLAG(x) \
+  static constexpr bool x = false;
+// Note: the static_assert in the following only works for public flags. Fix this when we cross
+//       the line at some point.
+#define DEFINE_RUNTIME_DEBUG_FLAG(C, x) \
+  static_assert(!C::x, "Unexpected enabled flag in release build");
+#else
+#define DECLARE_RUNTIME_DEBUG_FLAG(x) \
+  static bool x;
+#define DEFINE_RUNTIME_DEBUG_FLAG(C, x) \
+  bool C::x = RegisterRuntimeDebugFlag(&C::x);
+#endif  // NDEBUG
+
+bool RegisterRuntimeDebugFlag(bool* runtime_debug_flag);
+void SetRuntimeDebugFlagsEnabled(bool enabled);
+
+}  // namespace art
+
+#endif  // ART_RUNTIME_BASE_RUNTIME_DEBUG_H_