510 lines
20 KiB
C++
510 lines
20 KiB
C++
/*
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* Copyright 2006 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef RTC_BASE_CHECKS_H_
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#define RTC_BASE_CHECKS_H_
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// If you for some reson need to know if DCHECKs are on, test the value of
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// RTC_DCHECK_IS_ON. (Test its value, not if it's defined; it'll always be
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// defined, to either a true or a false value.)
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#if !defined(NDEBUG) || defined(DCHECK_ALWAYS_ON)
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#define RTC_DCHECK_IS_ON 1
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#else
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#define RTC_DCHECK_IS_ON 0
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#endif
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// Annotate a function that will not return control flow to the caller.
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#if defined(_MSC_VER)
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#define RTC_NORETURN __declspec(noreturn)
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#elif defined(__GNUC__)
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#define RTC_NORETURN __attribute__((__noreturn__))
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#else
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#define RTC_NORETURN
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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RTC_NORETURN void rtc_FatalMessage(const char* file, int line, const char* msg);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#ifdef RTC_DISABLE_CHECK_MSG
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#define RTC_CHECK_MSG_ENABLED 0
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#else
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#define RTC_CHECK_MSG_ENABLED 1
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#endif
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#if RTC_CHECK_MSG_ENABLED
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#define RTC_CHECK_EVAL_MESSAGE(message) message
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#else
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#define RTC_CHECK_EVAL_MESSAGE(message) ""
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#endif
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#ifdef __cplusplus
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// C++ version.
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#include <string>
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#include "absl/meta/type_traits.h"
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#include "absl/strings/string_view.h"
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#include "rtc_base/numerics/safe_compare.h"
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#include "rtc_base/system/inline.h"
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#include "rtc_base/system/rtc_export.h"
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// The macros here print a message to stderr and abort under various
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// conditions. All will accept additional stream messages. For example:
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// RTC_DCHECK_EQ(foo, bar) << "I'm printed when foo != bar.";
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//
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// - RTC_CHECK(x) is an assertion that x is always true, and that if it isn't,
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// it's better to terminate the process than to continue. During development,
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// the reason that it's better to terminate might simply be that the error
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// handling code isn't in place yet; in production, the reason might be that
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// the author of the code truly believes that x will always be true, but that
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// they recognizes that if they are wrong, abrupt and unpleasant process
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// termination is still better than carrying on with the assumption violated.
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//
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// RTC_CHECK always evaluates its argument, so it's OK for x to have side
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// effects.
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//
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// - RTC_DCHECK(x) is the same as RTC_CHECK(x)---an assertion that x is always
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// true---except that x will only be evaluated in debug builds; in production
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// builds, x is simply assumed to be true. This is useful if evaluating x is
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// expensive and the expected cost of failing to detect the violated
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// assumption is acceptable. You should not handle cases where a production
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// build fails to spot a violated condition, even those that would result in
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// crashes. If the code needs to cope with the error, make it cope, but don't
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// call RTC_DCHECK; if the condition really can't occur, but you'd sleep
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// better at night knowing that the process will suicide instead of carrying
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// on in case you were wrong, use RTC_CHECK instead of RTC_DCHECK.
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//
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// RTC_DCHECK only evaluates its argument in debug builds, so if x has visible
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// side effects, you need to write e.g.
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// bool w = x; RTC_DCHECK(w);
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//
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// - RTC_CHECK_EQ, _NE, _GT, ..., and RTC_DCHECK_EQ, _NE, _GT, ... are
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// specialized variants of RTC_CHECK and RTC_DCHECK that print prettier
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// messages if the condition doesn't hold. Prefer them to raw RTC_CHECK and
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// RTC_DCHECK.
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//
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// - FATAL() aborts unconditionally.
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namespace rtc {
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namespace webrtc_checks_impl {
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enum class CheckArgType : int8_t {
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kEnd = 0,
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kInt,
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kLong,
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kLongLong,
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kUInt,
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kULong,
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kULongLong,
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kDouble,
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kLongDouble,
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kCharP,
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kStdString,
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kStringView,
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kVoidP,
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// kCheckOp doesn't represent an argument type. Instead, it is sent as the
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// first argument from RTC_CHECK_OP to make FatalLog use the next two
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// arguments to build the special CHECK_OP error message
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// (the "a == b (1 vs. 2)" bit).
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kCheckOp,
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};
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#if RTC_CHECK_MSG_ENABLED
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RTC_NORETURN RTC_EXPORT void FatalLog(const char* file,
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int line,
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const char* message,
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const CheckArgType* fmt,
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...);
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#else
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RTC_NORETURN RTC_EXPORT void FatalLog(const char* file, int line);
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#endif
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// Wrapper for log arguments. Only ever make values of this type with the
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// MakeVal() functions.
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template <CheckArgType N, typename T>
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struct Val {
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static constexpr CheckArgType Type() { return N; }
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T GetVal() const { return val; }
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T val;
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};
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// Case for when we need to construct a temp string and then print that.
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// (We can't use Val<CheckArgType::kStdString, const std::string*>
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// because we need somewhere to store the temp string.)
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struct ToStringVal {
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static constexpr CheckArgType Type() { return CheckArgType::kStdString; }
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const std::string* GetVal() const { return &val; }
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std::string val;
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};
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inline Val<CheckArgType::kInt, int> MakeVal(int x) {
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return {x};
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}
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inline Val<CheckArgType::kLong, long> MakeVal(long x) {
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return {x};
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}
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inline Val<CheckArgType::kLongLong, long long> MakeVal(long long x) {
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return {x};
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}
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inline Val<CheckArgType::kUInt, unsigned int> MakeVal(unsigned int x) {
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return {x};
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}
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inline Val<CheckArgType::kULong, unsigned long> MakeVal(unsigned long x) {
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return {x};
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}
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inline Val<CheckArgType::kULongLong, unsigned long long> MakeVal(
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unsigned long long x) {
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return {x};
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}
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inline Val<CheckArgType::kDouble, double> MakeVal(double x) {
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return {x};
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}
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inline Val<CheckArgType::kLongDouble, long double> MakeVal(long double x) {
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return {x};
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}
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inline Val<CheckArgType::kCharP, const char*> MakeVal(const char* x) {
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return {x};
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}
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inline Val<CheckArgType::kStdString, const std::string*> MakeVal(
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const std::string& x) {
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return {&x};
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}
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inline Val<CheckArgType::kStringView, const absl::string_view*> MakeVal(
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const absl::string_view& x) {
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return {&x};
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}
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inline Val<CheckArgType::kVoidP, const void*> MakeVal(const void* x) {
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return {x};
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}
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// The enum class types are not implicitly convertible to arithmetic types.
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template <typename T,
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absl::enable_if_t<std::is_enum<T>::value &&
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!std::is_arithmetic<T>::value>* = nullptr>
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inline decltype(MakeVal(std::declval<absl::underlying_type_t<T>>())) MakeVal(
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T x) {
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return {static_cast<absl::underlying_type_t<T>>(x)};
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}
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template <typename T, decltype(ToLogString(std::declval<T>()))* = nullptr>
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ToStringVal MakeVal(const T& x) {
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return {ToLogString(x)};
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}
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// Ephemeral type that represents the result of the logging << operator.
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template <typename... Ts>
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class LogStreamer;
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// Base case: Before the first << argument.
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template <>
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class LogStreamer<> final {
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public:
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template <typename U,
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typename V = decltype(MakeVal(std::declval<U>())),
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absl::enable_if_t<std::is_arithmetic<U>::value ||
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std::is_enum<U>::value>* = nullptr>
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RTC_FORCE_INLINE LogStreamer<V> operator<<(U arg) const {
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return LogStreamer<V>(MakeVal(arg), this);
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}
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template <typename U,
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typename V = decltype(MakeVal(std::declval<U>())),
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absl::enable_if_t<!std::is_arithmetic<U>::value &&
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!std::is_enum<U>::value>* = nullptr>
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RTC_FORCE_INLINE LogStreamer<V> operator<<(const U& arg) const {
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return LogStreamer<V>(MakeVal(arg), this);
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}
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#if RTC_CHECK_MSG_ENABLED
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template <typename... Us>
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RTC_NORETURN RTC_FORCE_INLINE static void Call(const char* file,
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const int line,
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const char* message,
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const Us&... args) {
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static constexpr CheckArgType t[] = {Us::Type()..., CheckArgType::kEnd};
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FatalLog(file, line, message, t, args.GetVal()...);
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}
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template <typename... Us>
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RTC_NORETURN RTC_FORCE_INLINE static void CallCheckOp(const char* file,
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const int line,
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const char* message,
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const Us&... args) {
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static constexpr CheckArgType t[] = {CheckArgType::kCheckOp, Us::Type()...,
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CheckArgType::kEnd};
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FatalLog(file, line, message, t, args.GetVal()...);
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}
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#else
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template <typename... Us>
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RTC_NORETURN RTC_FORCE_INLINE static void Call(const char* file,
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const int line) {
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FatalLog(file, line);
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}
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#endif
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};
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// Inductive case: We've already seen at least one << argument. The most recent
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// one had type `T`, and the earlier ones had types `Ts`.
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template <typename T, typename... Ts>
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class LogStreamer<T, Ts...> final {
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public:
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RTC_FORCE_INLINE LogStreamer(T arg, const LogStreamer<Ts...>* prior)
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: arg_(arg), prior_(prior) {}
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template <typename U,
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typename V = decltype(MakeVal(std::declval<U>())),
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absl::enable_if_t<std::is_arithmetic<U>::value ||
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std::is_enum<U>::value>* = nullptr>
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RTC_FORCE_INLINE LogStreamer<V, T, Ts...> operator<<(U arg) const {
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return LogStreamer<V, T, Ts...>(MakeVal(arg), this);
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}
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template <typename U,
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typename V = decltype(MakeVal(std::declval<U>())),
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absl::enable_if_t<!std::is_arithmetic<U>::value &&
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!std::is_enum<U>::value>* = nullptr>
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RTC_FORCE_INLINE LogStreamer<V, T, Ts...> operator<<(const U& arg) const {
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return LogStreamer<V, T, Ts...>(MakeVal(arg), this);
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}
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#if RTC_CHECK_MSG_ENABLED
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template <typename... Us>
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RTC_NORETURN RTC_FORCE_INLINE void Call(const char* file,
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const int line,
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const char* message,
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const Us&... args) const {
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prior_->Call(file, line, message, arg_, args...);
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}
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template <typename... Us>
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RTC_NORETURN RTC_FORCE_INLINE void CallCheckOp(const char* file,
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const int line,
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const char* message,
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const Us&... args) const {
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prior_->CallCheckOp(file, line, message, arg_, args...);
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}
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#else
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template <typename... Us>
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RTC_NORETURN RTC_FORCE_INLINE void Call(const char* file,
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const int line) const {
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prior_->Call(file, line);
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}
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#endif
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private:
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// The most recent argument.
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T arg_;
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// Earlier arguments.
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const LogStreamer<Ts...>* prior_;
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};
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template <bool isCheckOp>
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class FatalLogCall final {
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public:
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FatalLogCall(const char* file, int line, const char* message)
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: file_(file), line_(line), message_(message) {}
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// This can be any binary operator with precedence lower than <<.
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template <typename... Ts>
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RTC_NORETURN RTC_FORCE_INLINE void operator&(
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const LogStreamer<Ts...>& streamer) {
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#if RTC_CHECK_MSG_ENABLED
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isCheckOp ? streamer.CallCheckOp(file_, line_, message_)
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: streamer.Call(file_, line_, message_);
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#else
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streamer.Call(file_, line_);
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#endif
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}
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private:
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const char* file_;
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int line_;
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const char* message_;
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};
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#if RTC_DCHECK_IS_ON
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// Be helpful, and include file and line in the RTC_CHECK_NOTREACHED error
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// message.
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#define RTC_UNREACHABLE_FILE_AND_LINE_CALL_ARGS __FILE__, __LINE__
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RTC_NORETURN RTC_EXPORT void UnreachableCodeReached(const char* file, int line);
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#else
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// Be mindful of binary size, and don't include file and line in the
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// RTC_CHECK_NOTREACHED error message.
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#define RTC_UNREACHABLE_FILE_AND_LINE_CALL_ARGS
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RTC_NORETURN RTC_EXPORT void UnreachableCodeReached();
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#endif
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} // namespace webrtc_checks_impl
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// The actual stream used isn't important. We reference |ignored| in the code
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// but don't evaluate it; this is to avoid "unused variable" warnings (we do so
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// in a particularly convoluted way with an extra ?: because that appears to be
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// the simplest construct that keeps Visual Studio from complaining about
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// condition being unused).
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#define RTC_EAT_STREAM_PARAMETERS(ignored) \
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(true ? true : ((void)(ignored), true)) \
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? static_cast<void>(0) \
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: ::rtc::webrtc_checks_impl::FatalLogCall<false>("", 0, "") & \
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::rtc::webrtc_checks_impl::LogStreamer<>()
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// Call RTC_EAT_STREAM_PARAMETERS with an argument that fails to compile if
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// values of the same types as |a| and |b| can't be compared with the given
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// operation, and that would evaluate |a| and |b| if evaluated.
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#define RTC_EAT_STREAM_PARAMETERS_OP(op, a, b) \
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RTC_EAT_STREAM_PARAMETERS(((void)::rtc::Safe##op(a, b)))
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// RTC_CHECK dies with a fatal error if condition is not true. It is *not*
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// controlled by NDEBUG or anything else, so the check will be executed
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// regardless of compilation mode.
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//
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// We make sure RTC_CHECK et al. always evaluates |condition|, as
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// doing RTC_CHECK(FunctionWithSideEffect()) is a common idiom.
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//
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// RTC_CHECK_OP is a helper macro for binary operators.
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// Don't use this macro directly in your code, use RTC_CHECK_EQ et al below.
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#if RTC_CHECK_MSG_ENABLED
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#define RTC_CHECK(condition) \
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(condition) ? static_cast<void>(0) \
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: ::rtc::webrtc_checks_impl::FatalLogCall<false>( \
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__FILE__, __LINE__, #condition) & \
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::rtc::webrtc_checks_impl::LogStreamer<>()
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#define RTC_CHECK_OP(name, op, val1, val2) \
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::rtc::Safe##name((val1), (val2)) \
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? static_cast<void>(0) \
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: ::rtc::webrtc_checks_impl::FatalLogCall<true>( \
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__FILE__, __LINE__, #val1 " " #op " " #val2) & \
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::rtc::webrtc_checks_impl::LogStreamer<>() << (val1) << (val2)
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#else
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#define RTC_CHECK(condition) \
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(condition) \
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? static_cast<void>(0) \
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: true ? ::rtc::webrtc_checks_impl::FatalLogCall<false>(__FILE__, \
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__LINE__, "") & \
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::rtc::webrtc_checks_impl::LogStreamer<>() \
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: ::rtc::webrtc_checks_impl::FatalLogCall<false>("", 0, "") & \
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::rtc::webrtc_checks_impl::LogStreamer<>()
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#define RTC_CHECK_OP(name, op, val1, val2) \
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::rtc::Safe##name((val1), (val2)) \
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? static_cast<void>(0) \
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: true ? ::rtc::webrtc_checks_impl::FatalLogCall<true>(__FILE__, \
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__LINE__, "") & \
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::rtc::webrtc_checks_impl::LogStreamer<>() \
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: ::rtc::webrtc_checks_impl::FatalLogCall<false>("", 0, "") & \
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::rtc::webrtc_checks_impl::LogStreamer<>()
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#endif
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#define RTC_CHECK_EQ(val1, val2) RTC_CHECK_OP(Eq, ==, val1, val2)
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#define RTC_CHECK_NE(val1, val2) RTC_CHECK_OP(Ne, !=, val1, val2)
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#define RTC_CHECK_LE(val1, val2) RTC_CHECK_OP(Le, <=, val1, val2)
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#define RTC_CHECK_LT(val1, val2) RTC_CHECK_OP(Lt, <, val1, val2)
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#define RTC_CHECK_GE(val1, val2) RTC_CHECK_OP(Ge, >=, val1, val2)
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#define RTC_CHECK_GT(val1, val2) RTC_CHECK_OP(Gt, >, val1, val2)
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// The RTC_DCHECK macro is equivalent to RTC_CHECK except that it only generates
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// code in debug builds. It does reference the condition parameter in all cases,
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// though, so callers won't risk getting warnings about unused variables.
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#if RTC_DCHECK_IS_ON
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#define RTC_DCHECK(condition) RTC_CHECK(condition)
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#define RTC_DCHECK_EQ(v1, v2) RTC_CHECK_EQ(v1, v2)
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#define RTC_DCHECK_NE(v1, v2) RTC_CHECK_NE(v1, v2)
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#define RTC_DCHECK_LE(v1, v2) RTC_CHECK_LE(v1, v2)
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#define RTC_DCHECK_LT(v1, v2) RTC_CHECK_LT(v1, v2)
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#define RTC_DCHECK_GE(v1, v2) RTC_CHECK_GE(v1, v2)
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#define RTC_DCHECK_GT(v1, v2) RTC_CHECK_GT(v1, v2)
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#else
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#define RTC_DCHECK(condition) RTC_EAT_STREAM_PARAMETERS(condition)
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#define RTC_DCHECK_EQ(v1, v2) RTC_EAT_STREAM_PARAMETERS_OP(Eq, v1, v2)
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#define RTC_DCHECK_NE(v1, v2) RTC_EAT_STREAM_PARAMETERS_OP(Ne, v1, v2)
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#define RTC_DCHECK_LE(v1, v2) RTC_EAT_STREAM_PARAMETERS_OP(Le, v1, v2)
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#define RTC_DCHECK_LT(v1, v2) RTC_EAT_STREAM_PARAMETERS_OP(Lt, v1, v2)
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#define RTC_DCHECK_GE(v1, v2) RTC_EAT_STREAM_PARAMETERS_OP(Ge, v1, v2)
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#define RTC_DCHECK_GT(v1, v2) RTC_EAT_STREAM_PARAMETERS_OP(Gt, v1, v2)
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#endif
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#define RTC_UNREACHABLE_CODE_HIT false
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#define RTC_NOTREACHED() RTC_DCHECK(RTC_UNREACHABLE_CODE_HIT)
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// Kills the process with an error message. Never returns. Use when you wish to
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// assert that a point in the code is never reached.
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|
#define RTC_CHECK_NOTREACHED() \
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|
do { \
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|
::rtc::webrtc_checks_impl::UnreachableCodeReached( \
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|
RTC_UNREACHABLE_FILE_AND_LINE_CALL_ARGS); \
|
|
} while (0)
|
|
|
|
// TODO(bugs.webrtc.org/8454): Add an RTC_ prefix or rename differently.
|
|
#define FATAL() \
|
|
::rtc::webrtc_checks_impl::FatalLogCall<false>(__FILE__, __LINE__, \
|
|
"FATAL()") & \
|
|
::rtc::webrtc_checks_impl::LogStreamer<>()
|
|
|
|
// Performs the integer division a/b and returns the result. CHECKs that the
|
|
// remainder is zero.
|
|
template <typename T>
|
|
inline T CheckedDivExact(T a, T b) {
|
|
RTC_CHECK_EQ(a % b, 0) << a << " is not evenly divisible by " << b;
|
|
return a / b;
|
|
}
|
|
|
|
} // namespace rtc
|
|
|
|
#else // __cplusplus not defined
|
|
// C version. Lacks many features compared to the C++ version, but usage
|
|
// guidelines are the same.
|
|
|
|
#define RTC_CHECK(condition) \
|
|
do { \
|
|
if (!(condition)) { \
|
|
rtc_FatalMessage(__FILE__, __LINE__, \
|
|
RTC_CHECK_EVAL_MESSAGE("CHECK failed: " #condition)); \
|
|
} \
|
|
} while (0)
|
|
|
|
#define RTC_CHECK_EQ(a, b) RTC_CHECK((a) == (b))
|
|
#define RTC_CHECK_NE(a, b) RTC_CHECK((a) != (b))
|
|
#define RTC_CHECK_LE(a, b) RTC_CHECK((a) <= (b))
|
|
#define RTC_CHECK_LT(a, b) RTC_CHECK((a) < (b))
|
|
#define RTC_CHECK_GE(a, b) RTC_CHECK((a) >= (b))
|
|
#define RTC_CHECK_GT(a, b) RTC_CHECK((a) > (b))
|
|
|
|
#define RTC_DCHECK(condition) \
|
|
do { \
|
|
if (RTC_DCHECK_IS_ON && !(condition)) { \
|
|
rtc_FatalMessage(__FILE__, __LINE__, \
|
|
RTC_CHECK_EVAL_MESSAGE("DCHECK failed: " #condition)); \
|
|
} \
|
|
} while (0)
|
|
|
|
#define RTC_DCHECK_EQ(a, b) RTC_DCHECK((a) == (b))
|
|
#define RTC_DCHECK_NE(a, b) RTC_DCHECK((a) != (b))
|
|
#define RTC_DCHECK_LE(a, b) RTC_DCHECK((a) <= (b))
|
|
#define RTC_DCHECK_LT(a, b) RTC_DCHECK((a) < (b))
|
|
#define RTC_DCHECK_GE(a, b) RTC_DCHECK((a) >= (b))
|
|
#define RTC_DCHECK_GT(a, b) RTC_DCHECK((a) > (b))
|
|
|
|
#endif // __cplusplus
|
|
|
|
#endif // RTC_BASE_CHECKS_H_
|