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/*
* Interface for configuring and controlling the state of tracing events.
*
* Copyright (C) 2011-2016 Lluís Vilanova <vilanova@ac.upc.edu>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#ifndef TRACE__CONTROL_H
#define TRACE__CONTROL_H
#include "qemu-common.h"
#include "trace/generated-events.h"
/**
* TraceEventID:
*
* Unique tracing event identifier.
*
* These are named as 'TRACE_${EVENT_NAME}'.
*
* See also: "trace/generated-events.h"
*/
enum TraceEventID;
/**
* trace_event_id:
* @id: Event identifier.
*
* Get an event by its identifier.
*
* This routine has a constant cost, as opposed to trace_event_name and
* trace_event_pattern.
*
* Pre-conditions: The identifier is valid.
*
* Returns: pointer to #TraceEvent.
*
*/
static TraceEvent *trace_event_id(TraceEventID id);
/**
* trace_event_name:
* @id: Event name.
*
* Search an event by its name.
*
* Returns: pointer to #TraceEvent or NULL if not found.
*/
TraceEvent *trace_event_name(const char *name);
/**
* trace_event_pattern:
* @pat: Event name pattern.
* @ev: Event to start searching from (not included).
*
* Get all events with a given name pattern.
*
* Returns: pointer to #TraceEvent or NULL if not found.
*/
TraceEvent *trace_event_pattern(const char *pat, TraceEvent *ev);
/**
* trace_event_is_pattern:
*
* Whether the given string is an event name pattern.
*/
static bool trace_event_is_pattern(const char *str);
/**
* trace_event_count:
*
* Return the number of events.
*/
static TraceEventID trace_event_count(void);
/**
* trace_event_get_id:
*
* Get the identifier of an event.
*/
static TraceEventID trace_event_get_id(TraceEvent *ev);
/**
* trace_event_get_vcpu_id:
*
* Get the per-vCPU identifier of an event.
*
* Special value #TRACE_VCPU_EVENT_COUNT means the event is not vCPU-specific
* (does not have the "vcpu" property).
*/
static TraceEventVCPUID trace_event_get_vcpu_id(TraceEvent *ev);
/**
* trace_event_is_vcpu:
*
* Whether this is a per-vCPU event.
*/
static bool trace_event_is_vcpu(TraceEvent *ev);
/**
* trace_event_get_name:
*
* Get the name of an event.
*/
static const char * trace_event_get_name(TraceEvent *ev);
/**
* trace_event_get_state:
* @id: Event identifier.
*
* Get the tracing state of an event (both static and dynamic).
*
* If the event has the disabled property, the check will have no performance
* impact.
*
* As a down side, you must always use an immediate #TraceEventID value.
*/
#define trace_event_get_state(id) \
((id ##_ENABLED) && trace_event_get_state_dynamic_by_id(id))
/**
* trace_event_get_state_static:
* @id: Event identifier.
*
* Get the static tracing state of an event.
*
* Use the define 'TRACE_${EVENT_NAME}_ENABLED' for compile-time checks (it will
* be set to 1 or 0 according to the presence of the disabled property).
*/
static bool trace_event_get_state_static(TraceEvent *ev);
/**
* trace_event_get_state_dynamic:
*
* Get the dynamic tracing state of an event.
*/
static bool trace_event_get_state_dynamic(TraceEvent *ev);
/**
* trace_event_set_state:
*
* Set the tracing state of an event (only if possible).
*/
#define trace_event_set_state(id, state) \
do { \
if ((id ##_ENABLED)) { \
TraceEvent *_e = trace_event_id(id); \
trace_event_set_state_dynamic(_e, state); \
} \
} while (0)
/**
* trace_event_set_state_dynamic:
*
* Set the dynamic tracing state of an event.
*
* Pre-condition: trace_event_get_state_static(ev) == true
*/
static void trace_event_set_state_dynamic(TraceEvent *ev, bool state);
/**
* trace_init_backends:
* @file: Name of trace output file; may be NULL.
* Corresponds to commandline option "-trace file=...".
*
* Initialize the tracing backend.
*
* Returns: Whether the backends could be successfully initialized.
*/
bool trace_init_backends(void);
/**
* trace_init_file:
* @file: Name of trace output file; may be NULL.
* Corresponds to commandline option "-trace file=...".
*
* Record the name of the output file for the tracing backend.
* Exits if no selected backend does not support specifying the
* output file, and a non-NULL file was passed.
*/
void trace_init_file(const char *file);
/**
* trace_list_events:
*
* List all available events.
*/
void trace_list_events(void);
/**
* trace_enable_events:
* @line_buf: A string with a glob pattern of events to be enabled or,
* if the string starts with '-', disabled.
*
* Enable or disable matching events.
*/
void trace_enable_events(const char *line_buf);
/**
* Definition of QEMU options describing trace subsystem configuration
*/
extern QemuOptsList qemu_trace_opts;
/**
* trace_opt_parse:
* @optarg: A string argument of --trace command line argument
*
* Initialize tracing subsystem.
*
* Returns the filename to save trace to. It must be freed with g_free().
*/
char *trace_opt_parse(const char *optarg);
#include "trace/control-internal.h"
#endif /* TRACE__CONTROL_H */
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