case EvGoUnblockLocal, EvGoSysExitLocal:
		g = ev.Args[0]
		init = gState{noseq, gWaiting}
		next = gState{seqinc, gRunnable}
		return
	case EvGCStart:
		g = garbage
		init = gState{ev.Args[0], gDead}
		next = gState{ev.Args[0] + 1, gDead}
		return
	default:
		// no ordering requirements
		g = unordered
		return
	}
}

func transitionReady(g uint64, curr, init gState) bool {

		return true
	})
	return frames
}

func viewerGState(state trace.GoState, inMarkAssist bool) traceviewer.GState {
	switch state {
	case trace.GoUndetermined:
		return traceviewer.GDead
	case trace.GoNotExist:
		return traceviewer.GDead
	case trace.GoRunnable:
		return traceviewer.GRunnable
	case trace.GoRunning:
		return traceviewer.GRunning
	case trace.GoWaiting:
		if inMarkAssist {
			return traceviewer.GWaitingGC

type heapStats struct {
	heapAlloc uint64
	nextGC    uint64
}

func viewerTime(t time.Duration) float64 {
	return float64(t) / float64(time.Microsecond)
}

type GState int

const (
	GDead GState = iota
	GRunnable
	GRunning
	GWaiting
	GWaitingGC

	gStateCount
)

type ThreadState int

const (
	ThreadStateInSyscall ThreadState = iota
	ThreadStateInSyscallRuntime

// (for example, a P does not run two Gs at the same time, or a G is indeed
// blocked before an unblock event).
func (p *parser) postProcessTrace(events Events) error {
	const (
		gDead = iota
		gRunnable
		gRunning
		gWaiting
	)
	type gdesc struct {
		state        int
		ev           *Event
		evStart      *Event
		evCreate     *Event
		evMarkAssist *Event
	}

	// goroutines to the end of the run queue.
	//
	// Note that while other P's may atomically CAS this to zero,
	// only the owner P can CAS it to a valid G.
	runnext guintptr

	// Available G's (status == Gdead)
	gFree struct {
		gList
		n int32
	}

	sudogcache []*sudog
	sudogbuf   [128]*sudog

	// Cache of mspan objects from the heap.
	mspancache struct {

package shift

// Simplified dead code detector.
// Used for skipping shift checks on unreachable arch-specific code.

import (
	"go/ast"
	"go/constant"
	"go/types"
)

// updateDead puts unreachable "if" and "case" nodes into dead.
func updateDead(info *types.Info, dead map[ast.Node]bool, node ast.Node) {
	if dead[node] {
		// The node is already marked as dead.
		return
	}

		newg = malg(stackMin)
		casgstatus(newg, _Gidle, _Gdead)
		allgadd(newg) // publishes with a g->status of Gdead so GC scanner doesn't look at uninitialized stack.
	}
	if newg.stack.hi == 0 {
		throw("newproc1: newg missing stack")
	}

	if readgstatus(newg) != _Gdead {
		throw("newproc1: new g is not Gdead")
	}

// license that can be found in the LICENSE file.

package main

func fail() // unimplemented, to test dead code elimination

// Test dead code elimination in if statements
func init() {
	if false {
		fail()
	}
	if 0 == 1 {
		fail()
	}
}

// Test dead code elimination in ordinary switch statements
func init() {
	const x = 0
	switch x {
	case 1:
		fail()
	}

	switch 1 {

unfinished work which they who fought here have thus far so nobly advanced. It is rather for us to be here dedicated to the great task remaining before us - that from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion - that we here highly resolve that these dead shall not have died in vain - that this nation, under God, shall have a new birth of freedom - and that government of the people, by the people, for the people, shall not perish...

input (control and non-control) is dead, all the outputs (control and
non-control) are dead as well. For `tf_executor.Merge`, the output is dead only
when either an input control token is dead or all of the regular inputs are
dead. For `tf_executor.ControlTrigger`, a live control output is always produced
even when some control inputs are dead.

### `tf_executor.graph` Operation