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0eddb002f0
Move logger::entry to libj6 as j6_log_entry, and use that everywhere. It was silly that it was copied into srv.logger and drv.uefi_fb
143 lines
3.4 KiB
C++
143 lines
3.4 KiB
C++
#include <new>
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#include <string.h>
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#include <util/format.h>
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#include <util/no_construct.h>
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#include "assert.h"
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#include "logger.h"
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#include "objects/system.h"
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#include "objects/thread.h"
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// The logger is initialized _before_ global constructors are called,
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// so that we can start log output immediately. Keep its constructor
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// from being called here so as to not overwrite the previous initialization.
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static util::no_construct<log::logger> __g_logger_storage;
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log::logger &g_logger = __g_logger_storage.value;
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namespace log {
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namespace {
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} // anon namespace
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logger *logger::s_log = nullptr;
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logger::logger() :
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m_buffer {nullptr, 0},
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m_start {0},
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m_end {0},
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m_count {0}
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{
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memset(&m_levels, 0, sizeof(m_levels));
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s_log = this;
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}
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logger::logger(util::buffer data) :
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m_buffer {data},
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m_start {0},
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m_end {0},
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m_count {0}
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{
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kassert((data.count & (data.count - 1)) == 0,
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"log buffer size must be a power of two");
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memset(&m_levels, 0, sizeof(m_levels));
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s_log = this;
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#define LOG(name, lvl) \
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set_level(logs::name, log::level::lvl);
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#include <j6/tables/log_areas.inc>
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#undef LOG
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}
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void
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logger::output(level severity, logs area, const char *fmt, va_list args)
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{
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static constexpr size_t buffer_len = 256;
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static constexpr size_t message_len = buffer_len - sizeof(j6_log_entry);
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char buffer[buffer_len];
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j6_log_entry *header = reinterpret_cast<j6_log_entry *>(buffer);
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size_t size = sizeof(j6_log_entry);
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size += util::vformat({header->message, message_len}, fmt, args);
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util::scoped_lock lock {m_lock};
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while (free() < size) {
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// Remove old entries until there's enough space
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const j6_log_entry *first = util::at<const j6_log_entry>(m_buffer, start());
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m_start += first->bytes;
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}
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header->id = ++m_count;
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header->bytes = size;
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header->severity = static_cast<uint8_t>(severity);
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header->area = static_cast<uint8_t>(area);
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memcpy(util::at<void>(m_buffer, end()), buffer, size);
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m_end += size;
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m_waiting.clear();
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}
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size_t
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logger::get_entry(uint64_t seen, void *buffer, size_t size)
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{
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util::scoped_lock lock {m_lock};
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while (seen == m_count) {
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lock.release();
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m_waiting.wait();
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lock.reacquire();
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}
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size_t off = m_start;
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j6_log_entry *ent = util::at<j6_log_entry>(m_buffer, off);
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while (seen >= ent->id) {
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off += ent->bytes;
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kassert(off < m_end, "Got to the end while looking for new log entry");
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ent = util::at<j6_log_entry>(m_buffer, off);
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}
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if (size >= ent->bytes)
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memcpy(buffer, ent, ent->bytes);
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return ent->bytes;
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}
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#define LOG_LEVEL_FUNCTION(name) \
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void name (logs area, const char *fmt, ...) { \
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logger *l = logger::s_log; \
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if (!l) return; \
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level limit = l->get_level(area); \
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if (level::name > limit) return; \
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va_list args; \
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va_start(args, fmt); \
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l->output(level::name, area, fmt, args); \
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va_end(args); \
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}
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LOG_LEVEL_FUNCTION(spam);
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LOG_LEVEL_FUNCTION(verbose);
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LOG_LEVEL_FUNCTION(info);
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LOG_LEVEL_FUNCTION(warn);
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LOG_LEVEL_FUNCTION(error);
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void fatal(logs area, const char *fmt, ...)
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{
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logger *l = logger::s_log;
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if (!l) return;
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va_list args;
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va_start(args, fmt);
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l->output(level::fatal, area, fmt, args);
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va_end(args);
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kassert(false, "log::fatal");
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}
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} // namespace log
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