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/* -----------------------------------------------------------------------------
*
* (c) The GHC Team, 2008-2009
*
* Event log format
*
* The log format is designed to be extensible: old tools should be
* able to parse (but not necessarily understand all of) new versions
* of the format, and new tools will be able to understand old log
* files.
*
* Each event has a specific format. If you add new events, give them
* new numbers: we never re-use old event numbers.
*
* - The format is endian-independent: all values are represented in
* bigendian order.
*
* - The format is extensible:
*
* - The header describes each event type and its length. Tools
* that don't recognise a particular event type can skip those events.
*
* - There is room for extra information in the event type
* specification, which can be ignored by older tools.
*
* - Events can have extra information added, but existing fields
* cannot be changed. Tools should ignore extra fields at the
* end of the event record.
*
* - Old event type ids are never re-used; just take a new identifier.
*
*
* The format
* ----------
*
* log : EVENT_HEADER_BEGIN
* EventType*
* EVENT_HEADER_END
* EVENT_DATA_BEGIN
* Event*
* EVENT_DATA_END
*
* EventType :
* EVENT_ET_BEGIN
* Word16 -- unique identifier for this event
* Int16 -- >=0 size of the event in bytes (minus the header)
* -- -1 variable size
* Word32 -- length of the next field in bytes
* Word8* -- string describing the event
* Word32 -- length of the next field in bytes
* Word8* -- extra info (for future extensions)
* EVENT_ET_END
*
* Event :
* Word16 -- event_type
* Word64 -- time (nanosecs)
* [Word16] -- length of the rest (for variable-sized events only)
* ... extra event-specific info ...
*
*
* To add a new event
* ------------------
*
* - In this file:
* - give it a new number, add a new #define EVENT_XXX below
* - In EventLog.c
* - add it to the EventDesc array
* - emit the event type in initEventLogging()
* - emit the new event in postEvent_()
* - generate the event itself by calling postEvent() somewhere
* - In the Haskell code to parse the event log file:
* - add types and code to read the new event
*
* -------------------------------------------------------------------------- */
#ifndef EVENTLOGFORMAT_H
#define EVENTLOGFORMAT_H
/*
* Markers for begin/end of the Header.
*/
#define EVENT_HEADER_BEGIN 0x68647262 /* 'h' 'd' 'r' 'b' */
#define EVENT_HEADER_END 0x68647265 /* 'h' 'd' 'r' 'e' */
#define EVENT_DATA_BEGIN 0x64617462 /* 'd' 'a' 't' 'b' */
#define EVENT_DATA_END 0xffff
/*
* Markers for begin/end of the list of Event Types in the Header.
* Header, Event Type, Begin = hetb
* Header, Event Type, End = hete
*/
#define EVENT_HET_BEGIN 0x68657462 /* 'h' 'e' 't' 'b' */
#define EVENT_HET_END 0x68657465 /* 'h' 'e' 't' 'e' */
#define EVENT_ET_BEGIN 0x65746200 /* 'e' 't' 'b' 0 */
#define EVENT_ET_END 0x65746500 /* 'e' 't' 'e' 0 */
/*
* Types of event
*/
#define EVENT_CREATE_THREAD 0 /* (cap, thread) */
#define EVENT_RUN_THREAD 1 /* (cap, thread) */
#define EVENT_STOP_THREAD 2 /* (cap, thread, status) */
#define EVENT_THREAD_RUNNABLE 3 /* (cap, thread) */
#define EVENT_MIGRATE_THREAD 4 /* (cap, thread, new_cap) */
#define EVENT_RUN_SPARK 5 /* (cap, thread) */
#define EVENT_STEAL_SPARK 6 /* (cap, thread, victim_cap) */
#define EVENT_SHUTDOWN 7 /* (cap) */
#define EVENT_THREAD_WAKEUP 8 /* (cap, thread, other_cap) */
#define EVENT_GC_START 9 /* (cap) */
#define EVENT_GC_END 10 /* (cap) */
#define EVENT_REQUEST_SEQ_GC 11 /* (cap) */
#define EVENT_REQUEST_PAR_GC 12 /* (cap) */
#define EVENT_CREATE_SPARK 13 /* (cap, thread) */
#define EVENT_SPARK_TO_THREAD 14 /* DEPRECATED! (cap, thread, spark_thread) */
#define EVENT_CREATE_SPARK_THREAD 15 /* (cap, thread, spark_thread) */
#define NUM_EVENT_TAGS 16
/*
* Status values for EVENT_STOP_THREAD
*
* 1-5 are the StgRun return values (from includes/Constants.h):
*
* #define HeapOverflow 1
* #define StackOverflow 2
* #define ThreadYielding 3
* #define ThreadBlocked 4
* #define ThreadFinished 5
*/
#define THREAD_SUSPENDED_FOREIGN_CALL 6
#ifndef EVENTLOG_CONSTANTS_ONLY
typedef StgWord16 EventTypeNum;
typedef StgWord64 EventTimestamp; // in nanoseconds
typedef StgWord64 EventThreadID;
typedef StgWord16 EventCapNo;
#endif
#endif /* EVENTLOGFORMAT_H */
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