//
// If two Stacks are equal then their Frames are guaranteed to be identical. If they are not
// equal, however, their Frames may still be equal.
type Stack struct {
	table *evTable
	id    stackID
}

// Frames is an iterator over the frames in a Stack.
func (s Stack) Frames(yield func(f StackFrame) bool) bool {
	if s.id == 0 {
		return true
	}

The failure prints stack traces for all goroutines if there is no current goroutine
or the failure is internal to the run-time.
GOTRACEBACK=none omits the goroutine stack traces entirely.
GOTRACEBACK=single (the default) behaves as described above.
GOTRACEBACK=all adds stack traces for all user-created goroutines.
GOTRACEBACK=system is like “all” but adds stack frames for run-time functions

// 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"

// 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].

	switch len(ci.frames) {
	case 0: // In the rare case when there are no frames at all, we return Frame{}.
		return
	case 1:
		frame = ci.frames[0]
		ci.frames = ci.frameStore[:0]
	case 2:
		frame = ci.frames[0]
		ci.frameStore[0] = ci.frames[1]
		ci.frames = ci.frameStore[:1]
	default:
		frame = ci.frames[0]
		ci.frames = ci.frames[1:]
	}

			}
			frames = append(frames, pc)

			if _, ok := pcs[pc]; !ok {
				pcs[pc] = frame{
					pc:     pc,
					funcID: stringID(funcID),
					fileID: stringID(fileID),
					line:   line,
				}
			}
		}

		// Add the stack to the map.
		if err := stackTable.insert(stackID(id), stack{pcs: frames}); err != nil {
			return err
		}
	}
	return nil

			})
		}
		return stack
	}

	for _, addr := range unprocessed {
		frames := makeFrames(addr)
		x := instructionInfo{
			objAddr: addr,
			length:  1,
			disasm:  synthAsm,
		}
		if len(frames) > 0 {
			x.file = frames[0].File
			x.line = frames[0].Line
		}
		sp.insts[addr] = x

		sp.addStack(addr, frames)
	}
}

type Summary struct {
	Goroutines map[GoID]*GoroutineSummary
	Tasks      map[TaskID]*UserTaskSummary
}

// GoroutineSummary contains statistics and execution details of a single goroutine.
// (For v2 traces.)
type GoroutineSummary struct {
	ID           GoID
	Name         string // A non-unique human-friendly identifier for the goroutine.
	PC           uint64 // The first PC we saw for the entry function of the goroutine

					{"main.main.func11", 0},
				}},
			}...)
		}
		stackMatches := func(stk trace.Stack, frames []frame) bool {
			i := 0
			match := true
			stk.Frames(func(f trace.StackFrame) bool {
				if f.Func != frames[i].fn {
					match = false
					return false
				}
				if line := uint64(frames[i].line); line != 0 && line != f.Line {
					match = false
					return false
				}
				i++

	// lastStopStack is the stack trace at the point of the last
	// call to the stop method. This tends to be a more reliable way
	// of picking up stack traces, since the parser doesn't provide
	// a stack for every state transition event.
	lastStopStack trace.Stack

	// activeRanges is the set of all active ranges on the goroutine.
	activeRanges map[string]activeRange