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Diffstat (limited to 'media/libjxl/src/lib/jxl/base/status.h')
| -rw-r--r-- | media/libjxl/src/lib/jxl/base/status.h | 324 |
1 files changed, 324 insertions, 0 deletions
diff --git a/media/libjxl/src/lib/jxl/base/status.h b/media/libjxl/src/lib/jxl/base/status.h new file mode 100644 index 0000000000..682f440014 --- /dev/null +++ b/media/libjxl/src/lib/jxl/base/status.h @@ -0,0 +1,324 @@ +// Copyright (c) the JPEG XL Project Authors. All rights reserved. +// +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +#ifndef LIB_JXL_BASE_STATUS_H_ +#define LIB_JXL_BASE_STATUS_H_ + +// Error handling: Status return type + helper macros. + +#include <stdarg.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> + +#include "lib/jxl/base/compiler_specific.h" +#include "lib/jxl/base/sanitizer_definitions.h" + +#if JXL_ADDRESS_SANITIZER || JXL_MEMORY_SANITIZER || JXL_THREAD_SANITIZER +#include "sanitizer/common_interface_defs.h" // __sanitizer_print_stack_trace +#endif // defined(*_SANITIZER) + +namespace jxl { + +// Uncomment to abort when JXL_FAILURE or JXL_STATUS with a fatal error is +// reached: +// #define JXL_CRASH_ON_ERROR + +#ifndef JXL_ENABLE_ASSERT +#define JXL_ENABLE_ASSERT 1 +#endif + +#ifndef JXL_ENABLE_CHECK +#define JXL_ENABLE_CHECK 1 +#endif + +// Pass -DJXL_DEBUG_ON_ERROR at compile time to print debug messages when a +// function returns JXL_FAILURE or calls JXL_NOTIFY_ERROR. Note that this is +// irrelevant if you also pass -DJXL_CRASH_ON_ERROR. +#if defined(JXL_DEBUG_ON_ERROR) || defined(JXL_CRASH_ON_ERROR) +#undef JXL_DEBUG_ON_ERROR +#define JXL_DEBUG_ON_ERROR 1 +#else // JXL_DEBUG_ON_ERROR || JXL_CRASH_ON_ERROR +#ifdef NDEBUG +#define JXL_DEBUG_ON_ERROR 0 +#else // NDEBUG +#define JXL_DEBUG_ON_ERROR 1 +#endif // NDEBUG +#endif // JXL_DEBUG_ON_ERROR || JXL_CRASH_ON_ERROR + +// Pass -DJXL_DEBUG_ON_ALL_ERROR at compile time to print debug messages on +// all error (fatal and non-fatal) status. This implies JXL_DEBUG_ON_ERROR. +#if defined(JXL_DEBUG_ON_ALL_ERROR) +#undef JXL_DEBUG_ON_ALL_ERROR +#define JXL_DEBUG_ON_ALL_ERROR 1 +// JXL_DEBUG_ON_ALL_ERROR implies JXL_DEBUG_ON_ERROR too. +#undef JXL_DEBUG_ON_ERROR +#define JXL_DEBUG_ON_ERROR 1 +#else // JXL_DEBUG_ON_ALL_ERROR +#define JXL_DEBUG_ON_ALL_ERROR 0 +#endif // JXL_DEBUG_ON_ALL_ERROR + +// The Verbose level for the library +#ifndef JXL_DEBUG_V_LEVEL +#define JXL_DEBUG_V_LEVEL 0 +#endif // JXL_DEBUG_V_LEVEL + +// Pass -DJXL_DEBUG_ON_ABORT=0 to disable the debug messages on JXL_ASSERT, +// JXL_CHECK and JXL_ABORT. +#ifndef JXL_DEBUG_ON_ABORT +#define JXL_DEBUG_ON_ABORT 1 +#endif // JXL_DEBUG_ON_ABORT + +// Print a debug message on standard error. You should use the JXL_DEBUG macro +// instead of calling Debug directly. This function returns false, so it can be +// used as a return value in JXL_FAILURE. +JXL_FORMAT(1, 2) +inline JXL_NOINLINE bool Debug(const char* format, ...) { + va_list args; + va_start(args, format); + vfprintf(stderr, format, args); + va_end(args); + return false; +} + +// Print a debug message on standard error if "enabled" is true. "enabled" is +// normally a macro that evaluates to 0 or 1 at compile time, so the Debug +// function is never called and optimized out in release builds. Note that the +// arguments are compiled but not evaluated when enabled is false. The format +// string must be a explicit string in the call, for example: +// JXL_DEBUG(JXL_DEBUG_MYMODULE, "my module message: %d", some_var); +// Add a header at the top of your module's .cc or .h file (depending on whether +// you have JXL_DEBUG calls from the .h as well) like this: +// #ifndef JXL_DEBUG_MYMODULE +// #define JXL_DEBUG_MYMODULE 0 +// #endif JXL_DEBUG_MYMODULE +#define JXL_DEBUG(enabled, format, ...) \ + do { \ + if (enabled) { \ + ::jxl::Debug(("%s:%d: " format "\n"), __FILE__, __LINE__, \ + ##__VA_ARGS__); \ + } \ + } while (0) + +// JXL_DEBUG version that prints the debug message if the global verbose level +// defined at compile time by JXL_DEBUG_V_LEVEL is greater or equal than the +// passed level. +#define JXL_DEBUG_V(level, format, ...) \ + JXL_DEBUG(level <= JXL_DEBUG_V_LEVEL, format, ##__VA_ARGS__) + +// Warnings (via JXL_WARNING) are enabled by default in debug builds (opt and +// debug). +#ifdef JXL_DEBUG_WARNING +#undef JXL_DEBUG_WARNING +#define JXL_DEBUG_WARNING 1 +#else // JXL_DEBUG_WARNING +#ifdef NDEBUG +#define JXL_DEBUG_WARNING 0 +#else // JXL_DEBUG_WARNING +#define JXL_DEBUG_WARNING 1 +#endif // NDEBUG +#endif // JXL_DEBUG_WARNING +#define JXL_WARNING(format, ...) \ + JXL_DEBUG(JXL_DEBUG_WARNING, format, ##__VA_ARGS__) + +// Exits the program after printing a stack trace when possible. +JXL_NORETURN inline JXL_NOINLINE bool Abort() { +#if JXL_ADDRESS_SANITIZER || JXL_MEMORY_SANITIZER || JXL_THREAD_SANITIZER + // If compiled with any sanitizer print a stack trace. This call doesn't crash + // the program, instead the trap below will crash it also allowing gdb to + // break there. + __sanitizer_print_stack_trace(); +#endif // *_SANITIZER) + +#if JXL_COMPILER_MSVC + __debugbreak(); + abort(); +#else + __builtin_trap(); +#endif +} + +// Exits the program after printing file/line plus a formatted string. +#define JXL_ABORT(format, ...) \ + ((JXL_DEBUG_ON_ABORT) && ::jxl::Debug(("%s:%d: JXL_ABORT: " format "\n"), \ + __FILE__, __LINE__, ##__VA_ARGS__), \ + ::jxl::Abort()) + +// Does not guarantee running the code, use only for debug mode checks. +#if JXL_ENABLE_ASSERT +#define JXL_ASSERT(condition) \ + do { \ + if (!(condition)) { \ + JXL_DEBUG(JXL_DEBUG_ON_ABORT, "JXL_ASSERT: %s", #condition); \ + ::jxl::Abort(); \ + } \ + } while (0) +#else +#define JXL_ASSERT(condition) \ + do { \ + } while (0) +#endif + +// Define JXL_IS_DEBUG_BUILD that denotes asan, msan and other debug builds, +// but not opt or release. +#ifndef JXL_IS_DEBUG_BUILD +#if !defined(NDEBUG) || defined(ADDRESS_SANITIZER) || \ + defined(MEMORY_SANITIZER) || defined(THREAD_SANITIZER) || \ + defined(__clang_analyzer__) +#define JXL_IS_DEBUG_BUILD 1 +#else +#define JXL_IS_DEBUG_BUILD 0 +#endif +#endif // JXL_IS_DEBUG_BUILD + +// Same as above, but only runs in debug builds (builds where NDEBUG is not +// defined). This is useful for slower asserts that we want to run more rarely +// than usual. These will run on asan, msan and other debug builds, but not in +// opt or release. +#if JXL_IS_DEBUG_BUILD +#define JXL_DASSERT(condition) \ + do { \ + if (!(condition)) { \ + JXL_DEBUG(JXL_DEBUG_ON_ABORT, "JXL_DASSERT: %s", #condition); \ + ::jxl::Abort(); \ + } \ + } while (0) +#else +#define JXL_DASSERT(condition) \ + do { \ + } while (0) +#endif + +// Always runs the condition, so can be used for non-debug calls. +#if JXL_ENABLE_CHECK +#define JXL_CHECK(condition) \ + do { \ + if (!(condition)) { \ + JXL_DEBUG(JXL_DEBUG_ON_ABORT, "JXL_CHECK: %s", #condition); \ + ::jxl::Abort(); \ + } \ + } while (0) +#else +#define JXL_CHECK(condition) \ + do { \ + (void)(condition); \ + } while (0) +#endif + +// A jxl::Status value from a StatusCode or Status which prints a debug message +// when enabled. +#define JXL_STATUS(status, format, ...) \ + ::jxl::StatusMessage(::jxl::Status(status), "%s:%d: " format "\n", __FILE__, \ + __LINE__, ##__VA_ARGS__) + +// Notify of an error but discard the resulting Status value. This is only +// useful for debug builds or when building with JXL_CRASH_ON_ERROR. +#define JXL_NOTIFY_ERROR(format, ...) \ + (void)JXL_STATUS(::jxl::StatusCode::kGenericError, "JXL_ERROR: " format, \ + ##__VA_ARGS__) + +// An error Status with a message. The JXL_STATUS() macro will return a Status +// object with a kGenericError code, but the comma operator helps with +// clang-tidy inference and potentially with optimizations. +#define JXL_FAILURE(format, ...) \ + ((void)JXL_STATUS(::jxl::StatusCode::kGenericError, "JXL_FAILURE: " format, \ + ##__VA_ARGS__), \ + ::jxl::Status(::jxl::StatusCode::kGenericError)) + +// Always evaluates the status exactly once, so can be used for non-debug calls. +// Returns from the current context if the passed Status expression is an error +// (fatal or non-fatal). The return value is the passed Status. +#define JXL_RETURN_IF_ERROR(status) \ + do { \ + ::jxl::Status jxl_return_if_error_status = (status); \ + if (!jxl_return_if_error_status) { \ + (void)::jxl::StatusMessage( \ + jxl_return_if_error_status, \ + "%s:%d: JXL_RETURN_IF_ERROR code=%d: %s\n", __FILE__, __LINE__, \ + static_cast<int>(jxl_return_if_error_status.code()), #status); \ + return jxl_return_if_error_status; \ + } \ + } while (0) + +// As above, but without calling StatusMessage. Intended for bundles (see +// fields.h), which have numerous call sites (-> relevant for code size) and do +// not want to generate excessive messages when decoding partial headers. +#define JXL_QUIET_RETURN_IF_ERROR(status) \ + do { \ + ::jxl::Status jxl_return_if_error_status = (status); \ + if (!jxl_return_if_error_status) { \ + return jxl_return_if_error_status; \ + } \ + } while (0) + +enum class StatusCode : int32_t { + // Non-fatal errors (negative values). + kNotEnoughBytes = -1, + + // The only non-error status code. + kOk = 0, + + // Fatal-errors (positive values) + kGenericError = 1, +}; + +// Drop-in replacement for bool that raises compiler warnings if not used +// after being returned from a function. Example: +// Status LoadFile(...) { return true; } is more compact than +// bool JXL_MUST_USE_RESULT LoadFile(...) { return true; } +// In case of error, the status can carry an extra error code in its value which +// is split between fatal and non-fatal error codes. +class JXL_MUST_USE_RESULT Status { + public: + // We want implicit constructor from bool to allow returning "true" or "false" + // on a function when using Status. "true" means kOk while "false" means a + // generic fatal error. + // NOLINTNEXTLINE(google-explicit-constructor) + constexpr Status(bool ok) + : code_(ok ? StatusCode::kOk : StatusCode::kGenericError) {} + + // NOLINTNEXTLINE(google-explicit-constructor) + constexpr Status(StatusCode code) : code_(code) {} + + // We also want implicit cast to bool to check for return values of functions. + // NOLINTNEXTLINE(google-explicit-constructor) + constexpr operator bool() const { return code_ == StatusCode::kOk; } + + constexpr StatusCode code() const { return code_; } + + // Returns whether the status code is a fatal error. + constexpr bool IsFatalError() const { + return static_cast<int32_t>(code_) > 0; + } + + private: + StatusCode code_; +}; + +// Helper function to create a Status and print the debug message or abort when +// needed. +inline JXL_FORMAT(2, 3) Status + StatusMessage(const Status status, const char* format, ...) { + // This block will be optimized out when JXL_DEBUG_ON_ERROR and + // JXL_DEBUG_ON_ALL_ERROR are both disabled. + if ((JXL_DEBUG_ON_ERROR && status.IsFatalError()) || + (JXL_DEBUG_ON_ALL_ERROR && !status)) { + va_list args; + va_start(args, format); + vfprintf(stderr, format, args); + va_end(args); + } +#ifdef JXL_CRASH_ON_ERROR + // JXL_CRASH_ON_ERROR means to Abort() only on non-fatal errors. + if (status.IsFatalError()) { + Abort(); + } +#endif // JXL_CRASH_ON_ERROR + return status; +} + +} // namespace jxl + +#endif // LIB_JXL_BASE_STATUS_H_ |