"internal/trace"
	"internal/trace/traceviewer"
	"time"
)

// viewerFrames returns the frames of the stack of ev. The given frame slice is
// used to store the frames to reduce allocations.
func viewerFrames(stk trace.Stack) []*trace.Frame {
	var frames []*trace.Frame
	stk.Frames(func(f trace.StackFrame) bool {
		frames = append(frames, &trace.Frame{
			PC:   f.PC,
			Fn:   f.Func,
			File: f.File,
			Line: int(f.Line),
		})

// Package oldtrace implements a parser for Go execution traces from versions
// 1.11–1.21.
//
// The package started as a copy of Go 1.19's internal/trace, but has been
// optimized to be faster while using less memory and fewer allocations. It has
// been further modified for the specific purpose of converting traces to the
// new 1.22+ format.
package oldtrace

import (
	"bytes"
	"cmp"

			secondRound: []string{"a"},
		},
	}
	expectations := newUIDTrackingExpectations()

	// Insert first round of keys in parallel.

	var wg sync.WaitGroup
	wg.Add(len(tracks))
	errs := make([]error, len(tracks))
	for i := range tracks {
		track := tracks[i]
		go func(errID int) {
			errs[errID] = expectations.expectFinalizersRemoved(logger, track.job, track.firstRound)
			wg.Done()
		}(i)
	}
	wg.Wait()

func (d *pcDeck) tryAdd(pc uintptr, frames []runtime.Frame, symbolizeResult symbolizeFlag) (success bool) {
	if existing := len(d.frames); existing > 0 {
		// 'd.frames' are all expanded from one 'pc' and represent all
		// inlined functions so we check only the last one.
		newFrame := frames[0]
		last := d.frames[existing-1]
		if last.Func != nil { // the last frame can't be inlined. Flush.
			return false
		}

	var wg mysync.WaitGroup
	wg.Done()
	ci := runtime.CallersFrames(wg.Callers)
	frames := make([]runtime.Frame, 0, 4)
	for {
		frame, more := ci.Next()
		frames = append(frames, frame)
		if !more {
			break
		}
	}
	expecting := []string{
		"test/mysync.(*WaitGroup).Add",
		"test/mysync.(*WaitGroup).Done",
	}
	for i := 0; i < 2; i++ {
		if frames[i].Function != expecting[i] {

The trace test programs in the `testprog` directory generate traces to
stdout.
Otherwise they're just normal programs.

## Trace debug commands

The `cmd` directory contains helpful tools for debugging traces.

* `gotraceraw` parses traces without validation.
  It can produce a text version of the trace wire format, or convert
  the text format back into bytes.
* `gotracevalidate` parses traces and validates them.

// pcBuf and dst should not overlap.
//
// fpunwindExpand checks if pcBuf contains logical frames (which include inlined
// frames) or physical frames (produced by frame pointer unwinding) using a
// sentinel value in pcBuf[0]. Logical frames are simply returned without the
// sentinel. Physical frames are turned into logical frames via inline unwinding
// and by applying the skip value that's stored in pcBuf[0].

var sigtable = [...]sigTabT{
	// Traps that we cannot be recovered.
	{_SigThrow, "sys: trap: debug exception"},
	{_SigThrow, "sys: trap: invalid opcode"},

	// We can recover from some memory errors in runtime·sigpanic.
	{_SigPanic, "sys: trap: fault read"},  // SIGRFAULT
	{_SigPanic, "sys: trap: fault write"}, // SIGWFAULT

	// We can also recover from math errors.
	{_SigPanic, "sys: trap: divide error"}, // SIGINTDIV

			// otherwise be returned by frames.Next below.
			return
		}

		pc = pc[:n] // pass only valid pcs to runtime.CallersFrames
		frames := runtime.CallersFrames(pc)

		// Loop to get frames.
		// A fixed number of PCs can expand to an indefinite number of Frames.
		for {
			frame, more := frames.Next()

			// Process this frame.
			//

	}
	for i, w := range size {
		ln := firstLine + i
		if err := checkValue(frames[0], ln, "objects", count, objectsPerLine[ln]); err != nil {
			return err
		}
		if err := checkValue(frames[0], ln, "bytes", count*w, bytesPerLine[ln]); err != nil {
			return err
		}
	}
	return checkValue(frames[0], 0, "total", count*int64(len(size)), totalCount)
}