From 616d87444313db865c60fbeee36ebe5250ef301e Mon Sep 17 00:00:00 2001
From: Yuri Kunde Schlesner <yuriks@yuriks.net>
Date: Tue, 28 Oct 2014 05:36:00 -0200
Subject: New logging system
---
src/common/logging/backend.h | 134 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 134 insertions(+)
create mode 100644 src/common/logging/backend.h
(limited to 'src/common/logging/backend.h')
diff --git a/src/common/logging/backend.h b/src/common/logging/backend.h
new file mode 100644
index 0000000000..ae270efe81
--- /dev/null
+++ b/src/common/logging/backend.h
@@ -0,0 +1,134 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <cstdarg>
+#include <memory>
+#include <vector>
+
+#include "common/concurrent_ring_buffer.h"
+
+#include "common/logging/log.h"
+
+namespace Log {
+
+/**
+ * A log entry. Log entries are store in a structured format to permit more varied output
+ * formatting on different frontends, as well as facilitating filtering and aggregation.
+ */
+struct Entry {
+ std::chrono::microseconds timestamp;
+ Class log_class;
+ Level log_level;
+ std::string location;
+ std::string message;
+
+ Entry() = default;
+
+ // TODO(yuriks) Use defaulted move constructors once MSVC supports them
+#define MOVE(member) member(std::move(o.member))
+ Entry(Entry&& o)
+ : MOVE(timestamp), MOVE(log_class), MOVE(log_level),
+ MOVE(location), MOVE(message)
+ {}
+#undef MOVE
+
+ Entry& operator=(const Entry&& o) {
+#define MOVE(member) member = std::move(o.member)
+ MOVE(timestamp);
+ MOVE(log_class);
+ MOVE(log_level);
+ MOVE(location);
+ MOVE(message);
+#undef MOVE
+ return *this;
+ }
+};
+
+struct ClassInfo {
+ Class log_class;
+
+ /**
+ * Total number of (direct or indirect) sub classes this class has. If any, they follow in
+ * sequence after this class in the class list.
+ */
+ unsigned int num_children = 0;
+
+ ClassInfo(Class log_class) : log_class(log_class) {}
+};
+
+/**
+ * Logging management class. This class has the dual purpose of acting as an exchange point between
+ * the logging clients and the log outputter, as well as containing reflection info about available
+ * log classes.
+ */
+class Logger {
+private:
+ using Buffer = Common::ConcurrentRingBuffer<Entry, 16 * 1024 / sizeof(Entry)>;
+
+public:
+ static const size_t QUEUE_CLOSED = Buffer::QUEUE_CLOSED;
+
+ Logger();
+
+ /**
+ * Returns a list of all vector classes and subclasses. The sequence returned is a pre-order of
+ * classes and subclasses, which together with the `num_children` field in ClassInfo, allows
+ * you to recover the hierarchy.
+ */
+ const std::vector<ClassInfo>& GetClasses() const { return all_classes; }
+
+ /**
+ * Returns the name of the passed log class as a C-string. Subclasses are separated by periods
+ * instead of underscores as in the enumeration.
+ */
+ static const char* GetLogClassName(Class log_class);
+
+ /**
+ * Returns the name of the passed log level as a C-string.
+ */
+ static const char* GetLevelName(Level log_level);
+
+ /**
+ * Appends a messages to the log buffer.
+ * @note This function is thread safe.
+ */
+ void LogMessage(Entry entry);
+
+ /**
+ * Retrieves a batch of messages from the log buffer, blocking until they are available.
+ * @note This function is thread safe.
+ *
+ * @param out_buffer Destination buffer that will receive the log entries.
+ * @param buffer_len The maximum size of `out_buffer`.
+ * @return The number of entries stored. In case the logger is shutting down, `QUEUE_CLOSED` is
+ * returned, no entries are stored and the logger should shutdown.
+ */
+ size_t GetEntries(Entry* out_buffer, size_t buffer_len);
+
+ /**
+ * Initiates a shutdown of the logger. This will indicate to log output clients that they
+ * should shutdown.
+ */
+ void Close() { ring_buffer.Close(); }
+
+ /**
+ * Returns true if Close() has already been called on the Logger.
+ */
+ bool IsClosed() const { return ring_buffer.IsClosed(); }
+
+private:
+ Buffer ring_buffer;
+ std::vector<ClassInfo> all_classes;
+};
+
+/// 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);
+/// Initializes the default Logger.
+std::shared_ptr<Logger> InitGlobalLogger();
+
+}
--
cgit v1.2.3-70-g09d2