291 lines
12 KiB
C++
291 lines
12 KiB
C++
// Copyright (c) 2019 nyorain
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// Distributed under the Boost Software License, Version 1.0.
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// See accompanying file LICENSE or copy at http://www.boost.org/LICENSE_1_0.txt
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#ifndef INC_DLG_DLG_H_
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#define INC_DLG_DLG_H_
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <stdio.h>
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// Hosted at https://github.com/nyorain/dlg.
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// There are examples and documentation.
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// Issue reports and contributions appreciated.
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// - CONFIG -
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// Define this macro to make all dlg macros have no effect at all
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// #define DLG_DISABLE
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// the log/assertion levels below which logs/assertions are ignored
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// defaulted depending on the NDEBUG macro
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#ifndef DLG_LOG_LEVEL
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#ifdef NDEBUG
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#define DLG_LOG_LEVEL dlg_level_warn
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#else
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#define DLG_LOG_LEVEL dlg_level_trace
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#endif
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#endif
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#ifndef DLG_ASSERT_LEVEL
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#ifdef NDEBUG
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#define DLG_ASSERT_LEVEL dlg_level_warn
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#else
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#define DLG_ASSERT_LEVEL dlg_level_trace
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#endif
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#endif
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// the assert level of dlg_assert
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#ifndef DLG_DEFAULT_ASSERT
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#define DLG_DEFAULT_ASSERT dlg_level_error
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#endif
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// evaluated to the 'file' member in dlg_origin
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#ifndef DLG_FILE
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#define DLG_FILE dlg__strip_root_path(__FILE__, DLG_BASE_PATH)
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// the base path stripped from __FILE__. If you don't override DLG_FILE set this to
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// the project root to make 'main.c' from '/some/bullshit/main.c'
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#ifndef DLG_BASE_PATH
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#define DLG_BASE_PATH ""
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#endif
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#endif
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// Default tags applied to all logs/assertions (in the defining file).
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// Must be in format ```#define DLG_DEFAULT_TAGS "tag1", "tag2"```
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// or just nothing (as defaulted here)
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#ifndef DLG_DEFAULT_TAGS
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#define DLG_DEFAULT_TAGS_TERM NULL
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#else
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#define DLG_DEFAULT_TAGS_TERM DLG_DEFAULT_TAGS, NULL
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#endif
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// The function used for formatting. Can have any signature, but must be callable with
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// the arguments the log/assertions macros are called with. Must return a const char*
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// that will not be freed by dlg, the formatting function must keep track of it.
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// The formatting function might use dlg_thread_buffer or a custom owned buffer.
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// The returned const char* has to be valid until the dlg log/assertion ends.
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// Usually a c function with ... (i.e. using va_list) or a variadic c++ template do
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// allow formatting.
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#ifndef DLG_FMT_FUNC
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#define DLG_FMT_FUNC dlg__printf_format
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#endif
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// Only overwrite (i.e. predefine) this if you know what you are doing.
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// On windows this is used to add the dllimport specified.
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// If you are using the static version of dlg (on windows) define
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// DLG_STATIC before including dlg.h
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#ifndef DLG_API
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#if (defined(_WIN32) || defined(__CYGWIN__)) && !defined(DLG_STATIC)
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#define DLG_API __declspec(dllimport)
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#else
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#define DLG_API
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#endif
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#endif
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// This macro is used when an assertion fails. It gets the source expression
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// and can return an alternative (that must stay alive).
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// Mainly useful to execute something on failed assertion.
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#ifndef DLG_FAILED_ASSERTION_TEXT
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#define DLG_FAILED_ASSERTION_TEXT(x) x
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#endif
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// - utility -
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// two methods needed since cplusplus does not support compound literals
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// and c does not support uniform initialization/initializer lists
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#ifdef __cplusplus
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#include <initializer_list>
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#define DLG_CREATE_TAGS(...) std::initializer_list<const char*> \
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{DLG_DEFAULT_TAGS_TERM, __VA_ARGS__, NULL}.begin()
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#else
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#define DLG_CREATE_TAGS(...) (const char* const[]) {DLG_DEFAULT_TAGS_TERM, __VA_ARGS__, NULL}
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#endif
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#ifdef __GNUC__
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#define DLG_PRINTF_ATTRIB(a, b) __attribute__ ((format (printf, a, b)))
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#else
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#define DLG_PRINTF_ATTRIB(a, b)
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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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// Represents the importance of a log/assertion call.
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enum dlg_level {
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dlg_level_trace = 0, // temporary used debug, e.g. to check if control reaches function
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dlg_level_debug, // general debugging, prints e.g. all major events
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dlg_level_info, // general useful information
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dlg_level_warn, // warning, something went wrong but might have no (really bad) side effect
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dlg_level_error, // something really went wrong; expect serious issues
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dlg_level_fatal // critical error; application is likely to crash/exit
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};
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// Holds various information associated with a log/assertion call.
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// Forwarded to the output handler.
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struct dlg_origin {
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const char* file;
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unsigned int line;
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const char* func;
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enum dlg_level level;
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const char** tags; // null-terminated
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const char* expr; // assertion expression, otherwise null
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};
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// Type of the output handler, see dlg_set_handler.
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typedef void(*dlg_handler)(const struct dlg_origin* origin, const char* string, void* data);
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#ifndef DLG_DISABLE
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// Tagged/Untagged logging with variable level
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// Tags must always be in the format `("tag1", "tag2")` (including brackets)
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// Example usages:
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// dlg_log(dlg_level_warning, "test 1")
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// dlg_logt(("tag1, "tag2"), dlg_level_debug, "test %d", 2)
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#define dlg_log(level, ...) if(level >= DLG_LOG_LEVEL) \
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dlg__do_log(level, DLG_CREATE_TAGS(NULL), DLG_FILE, __LINE__, __func__, \
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DLG_FMT_FUNC(__VA_ARGS__), NULL)
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#define dlg_logt(level, tags, ...) if(level >= DLG_LOG_LEVEL) \
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dlg__do_log(level, DLG_CREATE_TAGS tags, DLG_FILE, __LINE__, __func__, \
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DLG_FMT_FUNC(__VA_ARGS__), NULL)
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// Dynamic level assert macros in various versions for additional arguments
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// Example usages:
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// dlg_assertl(dlg_level_warning, data != nullptr);
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// dlg_assertlt(("tag1, "tag2"), dlg_level_trace, data != nullptr);
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// dlg_asserttlm(("tag1), dlg_level_warning, data != nullptr, "Data must not be null");
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// dlg_assertlm(dlg_level_error, data != nullptr, "Data must not be null");
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#define dlg_assertl(level, expr) if(level >= DLG_ASSERT_LEVEL && !(expr)) \
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dlg__do_log(level, DLG_CREATE_TAGS(NULL), DLG_FILE, __LINE__, __func__, NULL, \
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DLG_FAILED_ASSERTION_TEXT(#expr))
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#define dlg_assertlt(level, tags, expr) if(level >= DLG_ASSERT_LEVEL && !(expr)) \
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dlg__do_log(level, DLG_CREATE_TAGS tags, DLG_FILE, __LINE__, __func__, NULL, \
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DLG_FAILED_ASSERTION_TEXT(#expr))
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#define dlg_assertlm(level, expr, ...) if(level >= DLG_ASSERT_LEVEL && !(expr)) \
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dlg__do_log(level, DLG_CREATE_TAGS(NULL), DLG_FILE, __LINE__, __func__, \
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DLG_FMT_FUNC(__VA_ARGS__), DLG_FAILED_ASSERTION_TEXT(#expr))
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#define dlg_assertltm(level, tags, expr, ...) if(level >= DLG_ASSERT_LEVEL && !(expr)) \
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dlg__do_log(level, DLG_CREATE_TAGS tags, DLG_FILE, __LINE__, \
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__func__, DLG_FMT_FUNC(__VA_ARGS__), DLG_FAILED_ASSERTION_TEXT(#expr))
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#define dlg__assert_or(level, tags, expr, code, msg) if(!(expr)) {\
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if(level >= DLG_ASSERT_LEVEL) \
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dlg__do_log(level, tags, DLG_FILE, __LINE__, __func__, msg, \
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DLG_FAILED_ASSERTION_TEXT(#expr)); \
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code; \
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} (void) NULL
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// - Private interface: not part of the abi/api but needed in macros -
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// Formats the given format string and arguments as printf would, uses the thread buffer.
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DLG_API const char* dlg__printf_format(const char* format, ...) DLG_PRINTF_ATTRIB(1, 2);
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DLG_API void dlg__do_log(enum dlg_level lvl, const char* const*, const char*, int,
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const char*, const char*, const char*);
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DLG_API const char* dlg__strip_root_path(const char* file, const char* base);
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#else // DLG_DISABLE
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#define dlg_log(level, ...)
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#define dlg_logt(level, tags, ...)
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#define dlg_assertl(level, expr) // assert without tags/message
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#define dlg_assertlt(level, tags, expr) // assert with tags
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#define dlg_assertlm(level, expr, ...) // assert with message
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#define dlg_assertltm(level, tags, expr, ...) // assert with tags & message
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#define dlg__assert_or(level, tags, expr, code, msg) if(!(expr)) { code; } (void) NULL
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#endif // DLG_DISABLE
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// The API below is independent from DLG_DISABLE
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// Sets the handler that is responsible for formatting and outputting log calls.
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// This function is not thread safe and the handler is set globally.
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// The handler itself must not change dlg tags or call a dlg macro (if it
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// does so, the provided string or tags array in 'origin' might get invalid).
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// The handler can also be used for various other things such as dealing
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// with failed assertions or filtering calls based on the passed tags.
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// The default handler is dlg_default_output (see its doc for more info).
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// If using c++ make sure the registered handler cannot throw e.g. by
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// wrapping everything into a try-catch blog.
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DLG_API void dlg_set_handler(dlg_handler handler, void* data);
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// The default output handler.
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// Only use this to reset the output handler, prefer to use
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// dlg_generic_output (from output.h) which this function simply calls.
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// It also flushes the stream used and correctly outputs even from multiple threads.
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DLG_API void dlg_default_output(const struct dlg_origin*, const char* string, void*);
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// Returns the currently active dlg handler and sets `data` to
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// its user data pointer. `data` must not be NULL.
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// Useful to create handler chains.
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// This function is not threadsafe, i.e. retrieving the handler while
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// changing it from another thread is unsafe.
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// See `dlg_set_handler`.
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DLG_API dlg_handler dlg_get_handler(void** data);
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// Adds the given tag associated with the given function to the thread specific list.
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// If func is not NULL the tag will only applied to calls from the same function.
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// Remove the tag again calling dlg_remove_tag (with exactly the same pointers!).
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// Does not check if the tag is already present.
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DLG_API void dlg_add_tag(const char* tag, const char* func);
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// Removes a tag added with dlg_add_tag (has no effect for tags no present).
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// The pointers must be exactly the same pointers that were supplied to dlg_add_tag,
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// this function will not check using strcmp. When the same tag/func combination
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// is added multiple times, this function remove exactly one candidate, it is
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// undefined which. Returns whether a tag was found (and removed).
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DLG_API bool dlg_remove_tag(const char* tag, const char* func);
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// Returns the thread-specific buffer and its size for dlg.
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// The buffer should only be used by formatting functions.
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// The buffer can be reallocated and the size changed, just make sure
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// to update both values correctly.
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DLG_API char** dlg_thread_buffer(size_t** size);
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// Untagged leveled logging
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#define dlg_trace(...) dlg_log(dlg_level_trace, __VA_ARGS__)
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#define dlg_debug(...) dlg_log(dlg_level_debug, __VA_ARGS__)
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#define dlg_info(...) dlg_log(dlg_level_info, __VA_ARGS__)
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#define dlg_warn(...) dlg_log(dlg_level_warn, __VA_ARGS__)
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#define dlg_error(...) dlg_log(dlg_level_error, __VA_ARGS__)
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#define dlg_fatal(...) dlg_log(dlg_level_fatal, __VA_ARGS__)
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// Tagged leveled logging
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#define dlg_tracet(tags, ...) dlg_logt(dlg_level_trace, tags, __VA_ARGS__)
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#define dlg_debugt(tags, ...) dlg_logt(dlg_level_debug, tags, __VA_ARGS__)
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#define dlg_infot(tags, ...) dlg_logt(dlg_level_info, tags, __VA_ARGS__)
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#define dlg_warnt(tags, ...) dlg_logt(dlg_level_warn, tags, __VA_ARGS__)
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#define dlg_errort(tags, ...) dlg_logt(dlg_level_error, tags, __VA_ARGS__)
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#define dlg_fatalt(tags, ...) dlg_logt(dlg_level_fatal, tags, __VA_ARGS__)
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// Assert macros useing DLG_DEFAULT_ASSERT as level
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#define dlg_assert(expr) dlg_assertl(DLG_DEFAULT_ASSERT, expr)
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#define dlg_assertt(tags, expr) dlg_assertlt(DLG_DEFAULT_ASSERT, tags, expr)
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#define dlg_assertm(expr, ...) dlg_assertlm(DLG_DEFAULT_ASSERT, expr, __VA_ARGS__)
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#define dlg_asserttm(tags, expr, ...) dlg_assertltm(DLG_DEFAULT_ASSERT, tags, expr, __VA_ARGS__)
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// If (expr) does not evaluate to true, always executes 'code' (no matter what
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// DLG_ASSERT_LEVEL is or if dlg is disabled or not).
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// When dlg is enabled and the level is greater or equal to DLG_ASSERT_LEVEL,
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// logs the failed assertion.
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// Example usages:
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// dlg_assertl_or(dlg_level_warn, data != nullptr, return);
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// dlg_assertlm_or(dlg_level_fatal, data != nullptr, return, "Data must not be null");
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// dlg_assert_or(data != nullptr, logError(); return false);
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#define dlg_assertltm_or(level, tags, expr, code, ...) dlg__assert_or(level, \
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DLG_CREATE_TAGS tags, expr, code, DLG_FMT_FUNC(__VA_ARGS__))
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#define dlg_assertlm_or(level, expr, code, ...) dlg__assert_or(level, \
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DLG_CREATE_TAGS(NULL), expr, code, DLG_FMT_FUNC(__VA_ARGS__))
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#define dlg_assertl_or(level, expr, code) dlg__assert_or(level, \
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DLG_CREATE_TAGS(NULL), expr, code, NULL)
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#define dlg_assert_or(expr, code) dlg_assertl_or(DLG_DEFAULT_ASSERT, expr, code)
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#define dlg_assertm_or(expr, code, ...) dlg_assertlm_or(DLG_DEFAULT_ASSERT, expr, code, __VA_ARGS__)
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#ifdef __cplusplus
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}
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#endif
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#endif // header guard
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