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#ifndef SHARE_VM_LOGGING_LOGPREFIX_HPP

#define SHARE_VM_LOGGING_LOGPREFIX_HPP

#include "gc/shared/gcId.hpp"

#include "logging/logTag.hpp"

// Prefixes prepend each log message for a specified tagset with a given prefix.

// These prefixes are written before the log message but after the log decorations.

//

// A prefix is defined as a function that takes a buffer (with some size) as argument.

// This function will be called for each log message, and should write the prefix

// to the given buffer. The function should return how many characters it wrote,

// which should never exceed the given size.

//

// List of prefixes for specific tags and/or tagsets.

// Syntax: LOG_PREFIX(<name of prefixer function>, LOG_TAGS(<chosen log tags>))

// Where the prefixer function matches the following signature: size_t (*)(char*, size_t)

// Prefix function for internal vm test

DEBUG_ONLY(size_t Test_log_prefix_prefixer(char* buf, size_t len);)

#define LOG_PREFIX_LIST \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, age)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, alloc)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, alloc, region)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, barrier)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, classhisto)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, compaction)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, cpu)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, ergo)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, ergo, cset)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, ergo, heap)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, ergo, ihop)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, ergo, refine)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, heap)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, heap, region)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, freelist)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, humongous)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, ihop)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, liveness)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, marking)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, metaspace)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, mmu)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, phases)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, phases, ref)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, phases, start)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, phases, task)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, plab)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, region)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, remset)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, ref)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, ref, start)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, start)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, stringtable)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, sweep)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, task)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, task, start)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, task, stats)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, task, time)) \

  DEBUG_ONLY(LOG_PREFIX(Test_log_prefix_prefixer, LOG_TAGS(logging, test))) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, tlab)) \

  LOG_PREFIX(GCId::print_prefix, LOG_TAGS(gc, workgang))

// The empty prefix, used when there's no prefix defined.

template <LogTagType T0, LogTagType T1, LogTagType T2, LogTagType T3, LogTagType T4, LogTagType GuardTag = LogTag::__NO_TAG>

struct LogPrefix : public AllStatic {

  STATIC_ASSERT(GuardTag == LogTag::__NO_TAG);

  static size_t prefix(char* buf, size_t len) {

    return 0;

  }

};

#define LOG_PREFIX(fn, ...) \

template <> struct LogPrefix<__VA_ARGS__> { \

  static size_t prefix(char* buf, size_t len) { \

    size_t ret = fn(buf, len); \

    /* Either prefix did fit (strlen(buf) == ret && ret < len) */ \

    /* or the prefix didn't fit in buffer (ret > len && strlen(buf) < len) */ \

    assert(ret == 0 || strlen(buf) < len, \

           "Buffer overrun by prefix function."); \

    assert(ret == 0 || strlen(buf) == ret || ret >= len, \

           "Prefix function should return length of prefix written," \

           " or the intended length of prefix if the buffer was too small."); \

    return ret; \

  } \

};

LOG_PREFIX_LIST

#undef LOG_PREFIX

#endif // SHARE_VM_LOGGING_LOGPREFIX_HPP