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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package event
// Type is the common in-memory representation of the low-leve
type Type uint8
// Spec is a specification for a trace event. It contains sufficient information
// to perform basic parsing of any trace event for any version of Go.
type Spec struct {
// Name is the human-readable name of the trace event.
Name string
// Args contains the names of each trace event's argument.
// Its length determines the number of arguments an event has.
//
// Argument names follow a certain structure and this structure
// is relied on by the testing framework to type-check arguments.
// The structure is is:
//
// (?P<name>[A-Za-z]+_)?(?P<type>[A-Za-z]+)
//
// In sum, it's an optional name followed by a type. If the name
// is present, it is separated from the type with an underscore.
// The valid argument types and the Go types they map to are listed
// in the ArgTypes variable.
Args []string
// StartEv indicates the event type of the corresponding "start"
// event, if this event is an "end," for a pair of events that
// represent a time range.
StartEv Type
// IsTimedEvent indicates whether this is an event that both
// appears in the main event stream and is surfaced to the
// trace reader.
//
// Events that are not "timed" are considered "structural"
// since they either need significant reinterpretation or
// otherwise aren't actually surfaced by the trace reader.
IsTimedEvent bool
// HasData is true if the event has trailer consisting of a
// varint length followed by unencoded bytes of some data.
HasData bool
// StringIDs indicates which of the arguments are string IDs.
StringIDs []int
// StackIDs indicates which of the arguments are stack IDs.
//
// The list is not sorted. The first index always refers to
// the main stack for the current execution context of the event.
StackIDs []int
// IsStack indicates that the event represents a complete
// stack trace. Specifically, it means that after the arguments
// there's a varint length, followed by 4*length varints. Each
// group of 4 represents the PC, file ID, func ID, and line number
// in that order.
IsStack bool
}
// ArgTypes is a list of valid argument types for use in Args.
//
// See the documentation of Args for more details.
var ArgTypes = [...]string{
"seq", // sequence number
"pstatus", // P status
"gstatus", // G status
"g", // trace.GoID
"m", // trace.ThreadID
"p", // trace.ProcID
"string", // string ID
"stack", // stack ID
"value", // uint64
"task", // trace.TaskID
}
// Names is a helper that produces a mapping of event names to event types.
func Names(specs []Spec) map[string]Type {
nameToType := make(map[string]Type)
for i, spec := range specs {
nameToType[spec.Name] = Type(byte(i))
}
return nameToType
}