1 files changed, 151 insertions, 0 deletions

diff --git a/src/common/logging/backend.cpp b/src/common/logging/backend.cpp
new file mode 100644
index 000000000..e79b84604
--- /dev/null
+++ b/src/common/logging/backend.cpp
@@ -0,0 +1,151 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include <algorithm>
+
+#include "common/log.h" // For _dbg_assert_
+
+#include "common/logging/backend.h"
+#include "common/logging/log.h"
+#include "common/logging/text_formatter.h"
+
+namespace Log {
+
+static std::shared_ptr<Logger> global_logger;
+
+/// Macro listing all log classes. Code should define CLS and SUB as desired before invoking this.
+#define ALL_LOG_CLASSES() \
+        CLS(Log) \
+        CLS(Common) \
+        SUB(Common, Filesystem) \
+        SUB(Common, Memory) \
+        CLS(Core) \
+        SUB(Core, ARM11) \
+        CLS(Config) \
+        CLS(Debug) \
+        SUB(Debug, Emulated) \
+        SUB(Debug, GPU) \
+        SUB(Debug, Breakpoint) \
+        CLS(Kernel) \
+        SUB(Kernel, SVC) \
+        CLS(Service) \
+        SUB(Service, SRV) \
+        SUB(Service, FS) \
+        SUB(Service, APT) \
+        SUB(Service, GSP) \
+        SUB(Service, AC) \
+        SUB(Service, PTM) \
+        SUB(Service, CFG) \
+        SUB(Service, DSP) \
+        SUB(Service, HID) \
+        CLS(HW) \
+        SUB(HW, Memory) \
+        SUB(HW, GPU) \
+        CLS(Frontend) \
+        CLS(Render) \
+        SUB(Render, Software) \
+        SUB(Render, OpenGL) \
+        CLS(Loader)
+
+Logger::Logger() {
+    // Register logging classes so that they can be queried at runtime
+    size_t parent_class;
+    all_classes.reserve((size_t)Class::Count);
+
+#define CLS(x) \
+        all_classes.push_back(Class::x); \
+        parent_class = all_classes.size() - 1;
+#define SUB(x, y) \
+        all_classes.push_back(Class::x##_##y); \
+        all_classes[parent_class].num_children += 1;
+
+    ALL_LOG_CLASSES()
+#undef CLS
+#undef SUB
+
+    // Ensures that ALL_LOG_CLASSES isn't missing any entries.
+    _dbg_assert_(Log, all_classes.size() == (size_t)Class::Count);
+}
+
+// GetClassName is a macro defined by Windows.h, grrr...
+const char* Logger::GetLogClassName(Class log_class) {
+    switch (log_class) {
+#define CLS(x) case Class::x: return #x;
+#define SUB(x, y) case Class::x##_##y: return #x "." #y;
+        ALL_LOG_CLASSES()
+#undef CLS
+#undef SUB
+    }
+    return "Unknown";
+}
+
+const char* Logger::GetLevelName(Level log_level) {
+#define LVL(x) case Level::x: return #x
+    switch (log_level) {
+        LVL(Trace);
+        LVL(Debug);
+        LVL(Info);
+        LVL(Warning);
+        LVL(Error);
+        LVL(Critical);
+    }
+    return "Unknown";
+#undef LVL
+}
+
+void Logger::LogMessage(Entry entry) {
+    ring_buffer.Push(std::move(entry));
+}
+
+size_t Logger::GetEntries(Entry* out_buffer, size_t buffer_len) {
+    return ring_buffer.BlockingPop(out_buffer, buffer_len);
+}
+
+std::shared_ptr<Logger> InitGlobalLogger() {
+    global_logger = std::make_shared<Logger>();
+    return global_logger;
+}
+
+Entry CreateEntry(Class log_class, Level log_level,
+                        const char* filename, unsigned int line_nr, const char* function,
+                        const char* format, va_list args) {
+    using std::chrono::steady_clock;
+    using std::chrono::duration_cast;
+
+    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());
+
+    return std::move(entry);
+}
+
+void LogMessage(Class log_class, Level log_level,
+                const char* filename, unsigned int line_nr, const char* function,
+                const char* format, ...) {
+    va_list args;
+    va_start(args, format);
+    Entry entry = CreateEntry(log_class, log_level,
+            filename, line_nr, function, format, args);
+    va_end(args);
+
+    if (global_logger != nullptr && !global_logger->IsClosed()) {
+        global_logger->LogMessage(std::move(entry));
+    } else {
+        // Fall back to directly printing to stderr
+        PrintMessage(entry);
+    }
+}
+
+}