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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "runtime_debug.h"
     18 
     19 #include <vector>
     20 
     21 #include "globals.h"
     22 
     23 namespace art {
     24 
     25 // We test here that the runtime-debug-checks are actually a no-op constexpr false in release
     26 // builds, as we can't check that in gtests (which are always debug).
     27 
     28 #ifdef NDEBUG
     29 namespace {
     30 DECLARE_RUNTIME_DEBUG_FLAG(kTestForConstexpr);
     31 static_assert(!kTestForConstexpr, "Issue with DECLARE_RUNTIME_DEBUG_FLAG in NDEBUG.");
     32 }
     33 #endif
     34 
     35 // Implementation of runtime debug flags. This should be compile-time optimized away in release
     36 // builds.
     37 namespace {
     38 bool gSlowEnabled = false;  // Default for slow flags is "off."
     39 
     40 // Use a function with a static to ensure our vector storage doesn't have initialization order
     41 // issues.
     42 std::vector<bool*>& GetFlagPtrs() {
     43   static std::vector<bool*> g_flag_ptrs;
     44   return g_flag_ptrs;
     45 }
     46 
     47 bool RegisterRuntimeDebugFlagImpl(bool* flag_ptr) {
     48   GetFlagPtrs().push_back(flag_ptr);
     49   return gSlowEnabled;
     50 }
     51 
     52 void SetRuntimeDebugFlagsEnabledImpl(bool enabled) {
     53   gSlowEnabled = enabled;
     54   for (bool* flag_ptr : GetFlagPtrs()) {
     55     *flag_ptr = enabled;
     56   }
     57 }
     58 
     59 }  // namespace
     60 
     61 bool RegisterRuntimeDebugFlag(bool* flag_ptr) {
     62   if (kIsDebugBuild) {
     63     return RegisterRuntimeDebugFlagImpl(flag_ptr);
     64   }
     65   return false;
     66 }
     67 
     68 void SetRuntimeDebugFlagsEnabled(bool enabled) {
     69   if (kIsDebugBuild) {
     70     SetRuntimeDebugFlagsEnabledImpl(enabled);
     71   }
     72 }
     73 
     74 }  // namespace art
     75