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.

import (
	"internal/runtime/atomic"
	"unsafe"
)

func osinit() {
	// https://webassembly.github.io/spec/core/exec/runtime.html#memory-instances
	physPageSize = 64 * 1024
	initBloc()
	ncpu = 1
	getg().m.procid = 2
}

const _SIGSEGV = 0xb

func sigpanic() {
	gp := getg()
	if !canpanic() {
		throw("unexpected signal during runtime execution")
	}

	// js only invokes the exception handler for memory faults.

	if traceEnabled() {
		throw("traceInitReadCPU called with trace enabled")
	}
	// Create new profBuf for CPU samples that will be emitted as events.
	// Format: after the timestamp, header is [pp.id, gp.goid, mp.procid].
	trace.cpuLogRead[0] = newProfBuf(3, profBufWordCount, profBufTagCount)
	trace.cpuLogRead[1] = newProfBuf(3, profBufWordCount, profBufTagCount)
	// We must not acquire trace.signalLock outside of a signal handler: a

			// transition.
			beforeState = ProcIdle
		}
		s = procStateTransition(ProcID(e.base.args[0]), beforeState, ProcIdle)
	case go122.EvProcStatus:
		// N.B. ordering.advance populates e.base.extra.
		s = procStateTransition(ProcID(e.base.args[0]), ProcState(e.base.extra(version.Go122)[0]), go122ProcStatus2ProcState[e.base.args[1]])
	case go122.EvGoCreate, go122.EvGoCreateBlocked:

type resource interface {
	trace.GoID | trace.ProcID | trace.ThreadID
}

// noResource indicates the lack of a resource.
const noResource = -1

// gState represents the trace viewer state of a goroutine in a trace.
//
// The type parameter on this type is the resource which is used to construct
// a timeline of events. e.g. R=ProcID for a proc-oriented view, R=GoID for
// a goroutine-oriented view, etc.

type pState struct {
	id     ProcID
	status go122.ProcStatus
	seq    seqCounter

	// rangeState is the state of special time ranges bound to this proc.
	rangeState
}

// mState is the state of a thread at a point in the trace.
type mState struct {
	g GoID   // Goroutine bound to this M. (The goroutine's state is Executing.)
	p ProcID // Proc bound to this M. (The proc's state is Executing.)

	if gp.lockedm == 0 {
		return nil, plainError("goroutine not locked to thread")
	}

	tid := int(gp.lockedm.ptr().procid)
	if tid == 0 {
		return nil, plainError("missing tid")
	}

	f := efaceOf(&fn)
	if f._type == nil || f._type.Kind_&abi.KindMask != abi.Func {
		return nil, plainError("fn must be a function")
	}

		ts = w.traceBuf.lastTime + 1
	}
	w.traceBuf.lastTime = ts
	w.traceBuf.link = nil
	w.traceBuf.pos = 0

	// Tolerate a nil mp.
	mID := ^uint64(0)
	if w.mp != nil {
		mID = uint64(w.mp.procid)
	}

	// Write the buffer's header.
	if exp == traceNoExperiment {
		w.byte(byte(traceEvEventBatch))
	} else {
		w.byte(byte(traceEvExperimentalBatch))
		w.byte(byte(exp))
	}

			go121Events: convertOldFormat(tr),
		}, nil
	case version.Go122, version.Go123:
		return &Reader{
			r: br,
			order: ordering{
				mStates:     make(map[ThreadID]*mState),
				pStates:     make(map[ProcID]*pState),
				gStates:     make(map[GoID]*gState),
				activeTasks: make(map[TaskID]taskState),
			},
			// Don't emit a sync event when we first go to emit events.
			emittedSync: true,
		}, nil
	default:

		w = w.writeProcStatus(uint64(pp.id), procStatus, pp.trace.inSweep)
	}
	if gp := tl.mp.curg; gp != nil && !gp.trace.statusWasTraced(tl.gen) && gp.trace.acquireStatus(tl.gen) {
		w = w.writeGoStatus(uint64(gp.goid), int64(tl.mp.procid), goStatus, gp.inMarkAssist, 0 /* no stack */)
	}
	return traceEventWriter{w}
}

// commit writes out a trace event and calls end. It's a helper to make the