Logging: Create logging macros based on fmtlib

Add a new set of logging macros based on fmtlib
Similar but not exactly the same as https://github.com/citra-emu/citra/pull/3533

Citra currently uses a different version of fmt, which does not support FMT_VARIADIC so
make_args is used instead. On the other hand, yuzu uses fmt 4.1.0 which doesn't have make_args yet
so FMT_VARIADIC is used.

src/common/CMakeLists.txt

@@ -90,7 +90,7 @@ endif()
 
 create_target_directory_groups(common)
 
-target_link_libraries(common PUBLIC Boost::boost microprofile)
+target_link_libraries(common PUBLIC Boost::boost fmt microprofile)
 if (ARCHITECTURE_x86_64)
     target_link_libraries(common PRIVATE xbyak)
 endif()

src/common/logging/backend.cpp

@@ -11,6 +11,7 @@
 #include "common/logging/filter.h"
 #include "common/logging/log.h"
 #include "common/logging/text_formatter.h"
+#include "common/string_util.h"
 
 namespace Log {
 
@@ -102,25 +103,20 @@ const char* GetLevelName(Level log_level) {
 }
 
 Entry CreateEntry(Class log_class, Level log_level, const char* filename, unsigned int line_nr,
-                  const char* function, const char* format, va_list args) {
+                  const char* function, std::string message) {
     using std::chrono::duration_cast;
     using std::chrono::steady_clock;
 
     static steady_clock::time_point time_origin = steady_clock::now();
 
-    std::array<char, 4 * 1024> formatting_buffer;
-
     Entry entry;
     entry.timestamp = duration_cast<std::chrono::microseconds>(steady_clock::now() - time_origin);
     entry.log_class = log_class;
     entry.log_level = log_level;
-
-    snprintf(formatting_buffer.data(), formatting_buffer.size(), "%s:%s:%u", filename, function,
-             line_nr);
-    entry.location = std::string(formatting_buffer.data());
-
-    vsnprintf(formatting_buffer.data(), formatting_buffer.size(), format, args);
-    entry.message = std::string(formatting_buffer.data());
+    entry.filename = Common::TrimSourcePath(filename);
+    entry.line_num = line_nr;
+    entry.function = function;
+    entry.message = std::move(message);
 
     return entry;
 }
@@ -131,15 +127,27 @@ void SetFilter(Filter* new_filter) {
     filter = new_filter;
 }
 
-void LogMessage(Class log_class, Level log_level, const char* filename, unsigned int line_nr,
+void LogMessage(Class log_class, Level log_level, const char* filename, unsigned int line_num,
                 const char* function, const char* format, ...) {
-    if (filter != nullptr && !filter->CheckMessage(log_class, log_level))
+    if (filter && !filter->CheckMessage(log_class, log_level))
         return;
-
+    std::array<char, 4 * 1024> formatting_buffer;
     va_list args;
     va_start(args, format);
-    Entry entry = CreateEntry(log_class, log_level, filename, line_nr, function, format, args);
+    vsnprintf(formatting_buffer.data(), formatting_buffer.size(), format, args);
     va_end(args);
+    Entry entry = CreateEntry(log_class, log_level, filename, line_num, function,
+                              std::string(formatting_buffer.data()));
+
+    PrintColoredMessage(entry);
+}
+
+void FmtLogMessage(Class log_class, Level log_level, const char* filename, unsigned int line_num,
+                   const char* function, const char* format, const fmt::ArgList& args) {
+    if (filter && !filter->CheckMessage(log_class, log_level))
+        return;
+    Entry entry =
+        CreateEntry(log_class, log_level, filename, line_num, function, fmt::format(format, args));
 
     PrintColoredMessage(entry);
 }

src/common/logging/backend.h

@@ -22,13 +22,16 @@ struct Entry {
     std::chrono::microseconds timestamp;
     Class log_class;
     Level log_level;
-    std::string location;
+    std::string filename;
+    unsigned int line_num;
+    std::string function;
     std::string message;
 
     Entry() = default;
     Entry(Entry&& o) = default;
 
     Entry& operator=(Entry&& o) = default;
+    Entry& operator=(const Entry& o) = default;
 };
 
 /**
@@ -44,7 +47,7 @@ const char* GetLevelName(Level log_level);
 
 /// Creates a log entry by formatting the given source location, and message.
 Entry CreateEntry(Class log_class, Level log_level, const char* filename, unsigned int line_nr,
-                  const char* function, const char* format, va_list args);
+                  const char* function, std::string message);
 
 void SetFilter(Filter* filter);
 } // namespace Log

src/common/logging/filter.cpp

@@ -65,14 +65,14 @@ bool Filter::ParseFilterRule(const std::string::const_iterator begin,
                              const std::string::const_iterator end) {
     auto level_separator = std::find(begin, end, ':');
     if (level_separator == end) {
-        LOG_ERROR(Log, "Invalid log filter. Must specify a log level after `:`: %s",
-                  std::string(begin, end).c_str());
+        NGLOG_ERROR(Log, "Invalid log filter. Must specify a log level after `:`: %s",
+                    std::string(begin, end).c_str());
         return false;
     }
 
     const Level level = GetLevelByName(level_separator + 1, end);
     if (level == Level::Count) {
-        LOG_ERROR(Log, "Unknown log level in filter: %s", std::string(begin, end).c_str());
+        NGLOG_ERROR(Log, "Unknown log level in filter: %s", std::string(begin, end).c_str());
         return false;
     }
 
@@ -83,7 +83,7 @@ bool Filter::ParseFilterRule(const std::string::const_iterator begin,
 
     const Class log_class = GetClassByName(begin, level_separator);
     if (log_class == Class::Count) {
-        LOG_ERROR(Log, "Unknown log class in filter: %s", std::string(begin, end).c_str());
+        NGLOG_ERROR(Log, "Unknown log class in filter: %s", std::string(begin, end).c_str());
         return false;
     }
 

src/common/logging/filter.h

@@ -19,7 +19,7 @@ namespace Log {
 class Filter {
 public:
     /// Initializes the filter with all classes having `default_level` as the minimum level.
-    Filter(Level default_level);
+    Filter(Level default_level = Level::Info);
 
     /// Resets the filter so that all classes have `level` as the minimum displayed level.
     void ResetAll(Level level);

src/common/logging/log.h

@@ -4,6 +4,8 @@
 
 #pragma once
 
+#include <chrono>
+#include <fmt/format.h>
 #include "common/common_types.h"
 
 namespace Log {
@@ -87,7 +89,7 @@ enum class Class : ClassType {
 };
 
 /// Logs a message to the global logger.
-void LogMessage(Class log_class, Level log_level, const char* filename, unsigned int line_nr,
+void LogMessage(Class log_class, Level log_level, const char* filename, unsigned int line_num,
                 const char* function,
 #ifdef _MSC_VER
                 _Printf_format_string_
@@ -99,6 +101,10 @@ void LogMessage(Class log_class, Level log_level, const char* filename, unsigned
 #endif
     ;
 
+void FmtLogMessage(Class log_class, Level log_level, const char* filename, unsigned int line_num,
+                   const char* function, const char* format, const fmt::ArgList& args);
+FMT_VARIADIC(void, FmtLogMessage, Class, Level, const char*, unsigned int, const char*, const char*)
+
 } // namespace Log
 
 #define LOG_GENERIC(log_class, log_level, ...)                                                     \
@@ -121,3 +127,28 @@ void LogMessage(Class log_class, Level log_level, const char* filename, unsigned
     LOG_GENERIC(::Log::Class::log_class, ::Log::Level::Error, __VA_ARGS__)
 #define LOG_CRITICAL(log_class, ...)                                                               \
     LOG_GENERIC(::Log::Class::log_class, ::Log::Level::Critical, __VA_ARGS__)
+
+// Define the fmt lib macros
+#ifdef _DEBUG
+#define NGLOG_TRACE(log_class, ...)                                                                \
+    ::Log::FmtLogMessage(::Log::Class::log_class, ::Log::Level::Trace, __FILE__, __LINE__,         \
+                         __func__, __VA_ARGS__)
+#else
+#define NGLOG_TRACE(log_class, fmt, ...) (void(0))
+#endif
+
+#define NGLOG_DEBUG(log_class, ...)                                                                \
+    ::Log::FmtLogMessage(::Log::Class::log_class, ::Log::Level::Debug, __FILE__, __LINE__,         \
+                         __func__, __VA_ARGS__)
+#define NGLOG_INFO(log_class, ...)                                                                 \
+    ::Log::FmtLogMessage(::Log::Class::log_class, ::Log::Level::Info, __FILE__, __LINE__,          \
+                         __func__, __VA_ARGS__)
+#define NGLOG_WARNING(log_class, ...)                                                              \
+    ::Log::FmtLogMessage(::Log::Class::log_class, ::Log::Level::Warning, __FILE__, __LINE__,       \
+                         __func__, __VA_ARGS__)
+#define NGLOG_ERROR(log_class, ...)                                                                \
+    ::Log::FmtLogMessage(::Log::Class::log_class, ::Log::Level::Error, __FILE__, __LINE__,         \
+                         __func__, __VA_ARGS__)
+#define NGLOG_CRITICAL(log_class, ...)                                                             \
+    ::Log::FmtLogMessage(::Log::Class::log_class, ::Log::Level::Critical, __FILE__, __LINE__,      \
+                         __func__, __VA_ARGS__)

src/common/logging/text_formatter.cpp

@@ -18,50 +18,29 @@
 
 namespace Log {
 
-// TODO(bunnei): This should be moved to a generic path manipulation library
-const char* TrimSourcePath(const char* path, const char* root) {
-    const char* p = path;
-
-    while (*p != '\0') {
-        const char* next_slash = p;
-        while (*next_slash != '\0' && *next_slash != '/' && *next_slash != '\\') {
-            ++next_slash;
-        }
-
-        bool is_src = Common::ComparePartialString(p, next_slash, root);
-        p = next_slash;
-
-        if (*p != '\0') {
-            ++p;
-        }
-        if (is_src) {
-            path = p;
-        }
-    }
-    return path;
-}
-
-void FormatLogMessage(const Entry& entry, char* out_text, size_t text_len) {
+std::string FormatLogMessage(const Entry& entry) {
     unsigned int time_seconds = static_cast<unsigned int>(entry.timestamp.count() / 1000000);
     unsigned int time_fractional = static_cast<unsigned int>(entry.timestamp.count() % 1000000);
 
     const char* class_name = GetLogClassName(entry.log_class);
     const char* level_name = GetLevelName(entry.log_level);
 
-    snprintf(out_text, text_len, "[%4u.%06u] %s <%s> %s: %s", time_seconds, time_fractional,
-             class_name, level_name, TrimSourcePath(entry.location.c_str()), entry.message.c_str());
+    return fmt::format("[{:4d}.{:06d}] {} <{}> {}:{}:{}: {}", time_seconds, time_fractional,
+                       class_name, level_name, entry.filename, entry.function, entry.line_num,
+                       entry.message);
 }
 
 void PrintMessage(const Entry& entry) {
-    std::array<char, 4 * 1024> format_buffer;
-    FormatLogMessage(entry, format_buffer.data(), format_buffer.size());
-    fputs(format_buffer.data(), stderr);
-    fputc('\n', stderr);
+    auto str = FormatLogMessage(entry) + '\n';
+    fputs(str.c_str(), stderr);
 }
 
 void PrintColoredMessage(const Entry& entry) {
 #ifdef _WIN32
-    static HANDLE console_handle = GetStdHandle(STD_ERROR_HANDLE);
+    HANDLE console_handle = GetStdHandle(STD_ERROR_HANDLE);
+    if (console_handle == INVALID_HANDLE_VALUE) {
+        return;
+    }
 
     CONSOLE_SCREEN_BUFFER_INFO original_info = {0};
     GetConsoleScreenBufferInfo(console_handle, &original_info);

src/common/logging/text_formatter.h

@@ -10,20 +10,8 @@ namespace Log {
 
 struct Entry;
 
-/**
- * Attempts to trim an arbitrary prefix from `path`, leaving only the part starting at `root`. It's
- * intended to be used to strip a system-specific build directory from the `__FILE__` macro,
- * leaving only the path relative to the sources root.
- *
- * @param path The input file path as a null-terminated string
- * @param root The name of the root source directory as a null-terminated string. Path up to and
- *             including the last occurrence of this name will be stripped
- * @return A pointer to the same string passed as `path`, but starting at the trimmed portion
- */
-const char* TrimSourcePath(const char* path, const char* root = "src");
-
 /// Formats a log entry into the provided text buffer.
-void FormatLogMessage(const Entry& entry, char* out_text, size_t text_len);
+std::string FormatLogMessage(const Entry& entry);
 /// Formats and prints a log entry to stderr.
 void PrintMessage(const Entry& entry);
 /// Prints the same message as `PrintMessage`, but colored acoording to the severity level.

src/common/string_util.cpp

@@ -462,4 +462,27 @@ std::string StringFromFixedZeroTerminatedBuffer(const char* buffer, size_t max_l
 
     return std::string(buffer, len);
 }
+
+const char* TrimSourcePath(const char* path, const char* root) {
+    const char* p = path;
+
+    while (*p != '\0') {
+        const char* next_slash = p;
+        while (*next_slash != '\0' && *next_slash != '/' && *next_slash != '\\') {
+            ++next_slash;
+        }
+
+        bool is_src = Common::ComparePartialString(p, next_slash, root);
+        p = next_slash;
+
+        if (*p != '\0') {
+            ++p;
+        }
+        if (is_src) {
+            path = p;
+        }
+    }
+    return path;
+}
+
 } // namespace Common

src/common/string_util.h

@@ -134,4 +134,17 @@ bool ComparePartialString(InIt begin, InIt end, const char* other) {
  * NUL-terminated then the string ends at max_len characters.
  */
 std::string StringFromFixedZeroTerminatedBuffer(const char* buffer, size_t max_len);
+
+/**
+ * Attempts to trim an arbitrary prefix from `path`, leaving only the part starting at `root`. It's
+ * intended to be used to strip a system-specific build directory from the `__FILE__` macro,
+ * leaving only the path relative to the sources root.
+ *
+ * @param path The input file path as a null-terminated string
+ * @param root The name of the root source directory as a null-terminated string. Path up to and
+ *             including the last occurrence of this name will be stripped
+ * @return A pointer to the same string passed as `path`, but starting at the trimmed portion
+ */
+const char* TrimSourcePath(const char* path, const char* root = "src");
+
 } // namespace Common