| 1 | /* |
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| 2 | Copyright 2018 Google Inc. All Rights Reserved. |
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| 3 | |
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| 4 | Licensed under the Apache License, Version 2.0 (the "License"); |
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| 5 | you may not use this file except in compliance with the License. |
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| 6 | You may obtain a copy of the License at |
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| 7 | |
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| 8 | http://www.apache.org/licenses/LICENSE-2.0 |
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| 9 | |
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| 10 | Unless required by applicable law or agreed to in writing, software |
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| 11 | distributed under the License is distributed on an "AS-IS" BASIS, |
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| 12 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 13 | See the License for the specific language governing permissions and |
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| 14 | limitations under the License. |
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| 15 | */ |
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| 16 | |
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| 17 | #ifndef RESONANCE_AUDIO_PLATFORM_LOGGING_H_ |
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| 18 | #define RESONANCE_AUDIO_PLATFORM_LOGGING_H_ |
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| 19 | |
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| 20 | #include <cstdlib> |
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| 21 | |
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| 22 | #include <cassert> |
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| 23 | #include <iostream> |
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| 24 | #include <sstream> |
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| 25 | |
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| 26 | #undef DCHECK |
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| 27 | #undef DCHECK_EQ |
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| 28 | #undef DCHECK_NE |
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| 29 | #undef DCHECK_LE |
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| 30 | #undef DCHECK_LT |
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| 31 | #undef DCHECK_GE |
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| 32 | #undef DCHECK_GT |
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| 33 | #undef CHECK |
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| 34 | #undef CHECK_EQ |
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| 35 | #undef CHECK_NE |
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| 36 | #undef CHECK_LE |
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| 37 | #undef CHECK_LT |
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| 38 | #undef CHECK_GE |
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| 39 | #undef CHECK_GT |
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| 40 | #undef CHECK_NOTNULL |
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| 41 | #undef LOG |
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| 42 | |
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| 43 | // This class is used to disable logging, while still allowing for log messages |
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| 44 | // to contain '<<' expressions. |
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| 45 | class NullLogger { |
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| 46 | public: |
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| 47 | std::ostream& GetStream() { |
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| 48 | static std::ostream kNullStream(nullptr); |
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| 49 | return kNullStream; |
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| 50 | } |
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| 51 | }; |
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| 52 | |
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| 53 | // If statement prevents unused variable warnings. |
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| 54 | #define DCHECK(expr) \ |
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| 55 | if (false && (expr)) \ |
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| 56 | ; \ |
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| 57 | else \ |
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| 58 | NullLogger().GetStream() |
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| 59 | #define DCHECK_OP(val1, val2, op) DCHECK((val1)op(val2)) |
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| 60 | |
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| 61 | #define DCHECK_EQ(val1, val2) DCHECK_OP((val1), (val2), ==) |
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| 62 | #define DCHECK_NE(val1, val2) DCHECK_OP((val1), (val2), !=) |
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| 63 | #define DCHECK_LE(val1, val2) DCHECK_OP((val1), (val2), <=) |
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| 64 | #define DCHECK_LT(val1, val2) DCHECK_OP((val1), (val2), <) |
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| 65 | #define DCHECK_GE(val1, val2) DCHECK_OP((val1), (val2), >=) |
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| 66 | #define DCHECK_GT(val1, val2) DCHECK_OP((val1), (val2), >) |
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| 67 | |
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| 68 | // This class is used to log to std::cerr. |
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| 69 | class FatalLogger { |
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| 70 | public: |
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| 71 | FatalLogger(const char* file, int line) { |
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| 72 | error_string_ << file << ":" << line << ": " ; |
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| 73 | } |
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| 74 | ~FatalLogger() { |
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| 75 | const std::string error_string = error_string_.str(); |
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| 76 | std::cerr << error_string << std::endl; |
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| 77 | abort(); |
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| 78 | } |
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| 79 | std::ostream& GetStream() { return error_string_; } |
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| 80 | |
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| 81 | private: |
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| 82 | std::ostringstream error_string_; |
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| 83 | }; |
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| 84 | |
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| 85 | #define CHECK(condition) \ |
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| 86 | !(condition) ? FatalLogger(__FILE__, __LINE__).GetStream() \ |
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| 87 | : NullLogger().GetStream() |
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| 88 | |
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| 89 | #define CHECK_OP(val1, val2, op) CHECK((val1)op(val2)) |
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| 90 | |
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| 91 | #define CHECK_EQ(val1, val2) CHECK_OP((val1), (val2), ==) |
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| 92 | #define CHECK_NE(val1, val2) CHECK_OP((val1), (val2), !=) |
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| 93 | #define CHECK_LE(val1, val2) CHECK_OP((val1), (val2), <=) |
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| 94 | #define CHECK_LT(val1, val2) CHECK_OP((val1), (val2), <) |
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| 95 | #define CHECK_GE(val1, val2) CHECK_OP((val1), (val2), >=) |
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| 96 | #define CHECK_GT(val1, val2) CHECK_OP((val1), (val2), >) |
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| 97 | |
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| 98 | // Helper for CHECK_NOTNULL(), using C++11 perfect forwarding. |
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| 99 | template <typename T> |
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| 100 | T CheckNotNull(T&& t) { |
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| 101 | assert(t != nullptr); |
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| 102 | return std::forward<T>(t); |
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| 103 | } |
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| 104 | #define CHECK_NOTNULL(val) CheckNotNull(val) |
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| 105 | |
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| 106 | #define LOG(severity) NullLogger().GetStream() |
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| 107 | |
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| 108 | #endif // RESONANCE_AUDIO_PLATFORM_LOGGING_H_ |
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| 109 | |
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