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Current File : /opt/golang/1.22.0/src/runtime/pprof/pprof.go
// Copyright 2010 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 pprof writes runtime profiling data in the format expected
// by the pprof visualization tool.
//
// # Profiling a Go program
//
// The first step to profiling a Go program is to enable profiling.
// Support for profiling benchmarks built with the standard testing
// package is built into go test. For example, the following command
// runs benchmarks in the current directory and writes the CPU and
// memory profiles to cpu.prof and mem.prof:
//
//	go test -cpuprofile cpu.prof -memprofile mem.prof -bench .
//
// To add equivalent profiling support to a standalone program, add
// code like the following to your main function:
//
//	var cpuprofile = flag.String("cpuprofile", "", "write cpu profile to `file`")
//	var memprofile = flag.String("memprofile", "", "write memory profile to `file`")
//
//	func main() {
//	    flag.Parse()
//	    if *cpuprofile != "" {
//	        f, err := os.Create(*cpuprofile)
//	        if err != nil {
//	            log.Fatal("could not create CPU profile: ", err)
//	        }
//	        defer f.Close() // error handling omitted for example
//	        if err := pprof.StartCPUProfile(f); err != nil {
//	            log.Fatal("could not start CPU profile: ", err)
//	        }
//	        defer pprof.StopCPUProfile()
//	    }
//
//	    // ... rest of the program ...
//
//	    if *memprofile != "" {
//	        f, err := os.Create(*memprofile)
//	        if err != nil {
//	            log.Fatal("could not create memory profile: ", err)
//	        }
//	        defer f.Close() // error handling omitted for example
//	        runtime.GC() // get up-to-date statistics
//	        if err := pprof.WriteHeapProfile(f); err != nil {
//	            log.Fatal("could not write memory profile: ", err)
//	        }
//	    }
//	}
//
// There is also a standard HTTP interface to profiling data. Adding
// the following line will install handlers under the /debug/pprof/
// URL to download live profiles:
//
//	import _ "net/http/pprof"
//
// See the net/http/pprof package for more details.
//
// Profiles can then be visualized with the pprof tool:
//
//	go tool pprof cpu.prof
//
// There are many commands available from the pprof command line.
// Commonly used commands include "top", which prints a summary of the
// top program hot-spots, and "web", which opens an interactive graph
// of hot-spots and their call graphs. Use "help" for information on
// all pprof commands.
//
// For more information about pprof, see
// https://github.com/google/pprof/blob/main/doc/README.md.
package pprof

import (
	"bufio"
	"fmt"
	"internal/abi"
	"io"
	"runtime"
	"sort"
	"strings"
	"sync"
	"text/tabwriter"
	"time"
	"unsafe"
)

// BUG(rsc): Profiles are only as good as the kernel support used to generate them.
// See https://golang.org/issue/13841 for details about known problems.

// A Profile is a collection of stack traces showing the call sequences
// that led to instances of a particular event, such as allocation.
// Packages can create and maintain their own profiles; the most common
// use is for tracking resources that must be explicitly closed, such as files
// or network connections.
//
// A Profile's methods can be called from multiple goroutines simultaneously.
//
// Each Profile has a unique name. A few profiles are predefined:
//
//	goroutine    - stack traces of all current goroutines
//	heap         - a sampling of memory allocations of live objects
//	allocs       - a sampling of all past memory allocations
//	threadcreate - stack traces that led to the creation of new OS threads
//	block        - stack traces that led to blocking on synchronization primitives
//	mutex        - stack traces of holders of contended mutexes
//
// These predefined profiles maintain themselves and panic on an explicit
// [Profile.Add] or [Profile.Remove] method call.
//
// The CPU profile is not available as a Profile. It has a special API,
// the [StartCPUProfile] and [StopCPUProfile] functions, because it streams
// output to a writer during profiling.
//
// # Heap profile
//
// The heap profile reports statistics as of the most recently completed
// garbage collection; it elides more recent allocation to avoid skewing
// the profile away from live data and toward garbage.
// If there has been no garbage collection at all, the heap profile reports
// all known allocations. This exception helps mainly in programs running
// without garbage collection enabled, usually for debugging purposes.
//
// The heap profile tracks both the allocation sites for all live objects in
// the application memory and for all objects allocated since the program start.
// Pprof's -inuse_space, -inuse_objects, -alloc_space, and -alloc_objects
// flags select which to display, defaulting to -inuse_space (live objects,
// scaled by size).
//
// # Allocs profile
//
// The allocs profile is the same as the heap profile but changes the default
// pprof display to -alloc_space, the total number of bytes allocated since
// the program began (including garbage-collected bytes).
//
// # Block profile
//
// The block profile tracks time spent blocked on synchronization primitives,
// such as [sync.Mutex], [sync.RWMutex], [sync.WaitGroup], [sync.Cond], and
// channel send/receive/select.
//
// Stack traces correspond to the location that blocked (for example,
// [sync.Mutex.Lock]).
//
// Sample values correspond to cumulative time spent blocked at that stack
// trace, subject to time-based sampling specified by
// [runtime.SetBlockProfileRate].
//
// # Mutex profile
//
// The mutex profile tracks contention on mutexes, such as [sync.Mutex],
// [sync.RWMutex], and runtime-internal locks.
//
// Stack traces correspond to the end of the critical section causing
// contention. For example, a lock held for a long time while other goroutines
// are waiting to acquire the lock will report contention when the lock is
// finally unlocked (that is, at [sync.Mutex.Unlock]).
//
// Sample values correspond to the approximate cumulative time other goroutines
// spent blocked waiting for the lock, subject to event-based sampling
// specified by [runtime.SetMutexProfileFraction]. For example, if a caller
// holds a lock for 1s while 5 other goroutines are waiting for the entire
// second to acquire the lock, its unlock call stack will report 5s of
// contention.
//
// Runtime-internal locks are always reported at the location
// "runtime._LostContendedRuntimeLock". More detailed stack traces for
// runtime-internal locks can be obtained by setting
// `GODEBUG=runtimecontentionstacks=1` (see package [runtime] docs for
// caveats).
type Profile struct {
	name  string
	mu    sync.Mutex
	m     map[any][]uintptr
	count func() int
	write func(io.Writer, int) error
}

// profiles records all registered profiles.
var profiles struct {
	mu sync.Mutex
	m  map[string]*Profile
}

var goroutineProfile = &Profile{
	name:  "goroutine",
	count: countGoroutine,
	write: writeGoroutine,
}

var threadcreateProfile = &Profile{
	name:  "threadcreate",
	count: countThreadCreate,
	write: writeThreadCreate,
}

var heapProfile = &Profile{
	name:  "heap",
	count: countHeap,
	write: writeHeap,
}

var allocsProfile = &Profile{
	name:  "allocs",
	count: countHeap, // identical to heap profile
	write: writeAlloc,
}

var blockProfile = &Profile{
	name:  "block",
	count: countBlock,
	write: writeBlock,
}

var mutexProfile = &Profile{
	name:  "mutex",
	count: countMutex,
	write: writeMutex,
}

func lockProfiles() {
	profiles.mu.Lock()
	if profiles.m == nil {
		// Initial built-in profiles.
		profiles.m = map[string]*Profile{
			"goroutine":    goroutineProfile,
			"threadcreate": threadcreateProfile,
			"heap":         heapProfile,
			"allocs":       allocsProfile,
			"block":        blockProfile,
			"mutex":        mutexProfile,
		}
	}
}

func unlockProfiles() {
	profiles.mu.Unlock()
}

// NewProfile creates a new profile with the given name.
// If a profile with that name already exists, NewProfile panics.
// The convention is to use a 'import/path.' prefix to create
// separate name spaces for each package.
// For compatibility with various tools that read pprof data,
// profile names should not contain spaces.
func NewProfile(name string) *Profile {
	lockProfiles()
	defer unlockProfiles()
	if name == "" {
		panic("pprof: NewProfile with empty name")
	}
	if profiles.m[name] != nil {
		panic("pprof: NewProfile name already in use: " + name)
	}
	p := &Profile{
		name: name,
		m:    map[any][]uintptr{},
	}
	profiles.m[name] = p
	return p
}

// Lookup returns the profile with the given name, or nil if no such profile exists.
func Lookup(name string) *Profile {
	lockProfiles()
	defer unlockProfiles()
	return profiles.m[name]
}

// Profiles returns a slice of all the known profiles, sorted by name.
func Profiles() []*Profile {
	lockProfiles()
	defer unlockProfiles()

	all := make([]*Profile, 0, len(profiles.m))
	for _, p := range profiles.m {
		all = append(all, p)
	}

	sort.Slice(all, func(i, j int) bool { return all[i].name < all[j].name })
	return all
}

// Name returns this profile's name, which can be passed to [Lookup] to reobtain the profile.
func (p *Profile) Name() string {
	return p.name
}

// Count returns the number of execution stacks currently in the profile.
func (p *Profile) Count() int {
	p.mu.Lock()
	defer p.mu.Unlock()
	if p.count != nil {
		return p.count()
	}
	return len(p.m)
}

// Add adds the current execution stack to the profile, associated with value.
// Add stores value in an internal map, so value must be suitable for use as
// a map key and will not be garbage collected until the corresponding
// call to [Profile.Remove]. Add panics if the profile already contains a stack for value.
//
// The skip parameter has the same meaning as [runtime.Caller]'s skip
// and controls where the stack trace begins. Passing skip=0 begins the
// trace in the function calling Add. For example, given this
// execution stack:
//
//	Add
//	called from rpc.NewClient
//	called from mypkg.Run
//	called from main.main
//
// Passing skip=0 begins the stack trace at the call to Add inside rpc.NewClient.
// Passing skip=1 begins the stack trace at the call to NewClient inside mypkg.Run.
func (p *Profile) Add(value any, skip int) {
	if p.name == "" {
		panic("pprof: use of uninitialized Profile")
	}
	if p.write != nil {
		panic("pprof: Add called on built-in Profile " + p.name)
	}

	stk := make([]uintptr, 32)
	n := runtime.Callers(skip+1, stk[:])
	stk = stk[:n]
	if len(stk) == 0 {
		// The value for skip is too large, and there's no stack trace to record.
		stk = []uintptr{abi.FuncPCABIInternal(lostProfileEvent)}
	}

	p.mu.Lock()
	defer p.mu.Unlock()
	if p.m[value] != nil {
		panic("pprof: Profile.Add of duplicate value")
	}
	p.m[value] = stk
}

// Remove removes the execution stack associated with value from the profile.
// It is a no-op if the value is not in the profile.
func (p *Profile) Remove(value any) {
	p.mu.Lock()
	defer p.mu.Unlock()
	delete(p.m, value)
}

// WriteTo writes a pprof-formatted snapshot of the profile to w.
// If a write to w returns an error, WriteTo returns that error.
// Otherwise, WriteTo returns nil.
//
// The debug parameter enables additional output.
// Passing debug=0 writes the gzip-compressed protocol buffer described
// in https://github.com/google/pprof/tree/master/proto#overview.
// Passing debug=1 writes the legacy text format with comments
// translating addresses to function names and line numbers, so that a
// programmer can read the profile without tools.
//
// The predefined profiles may assign meaning to other debug values;
// for example, when printing the "goroutine" profile, debug=2 means to
// print the goroutine stacks in the same form that a Go program uses
// when dying due to an unrecovered panic.
func (p *Profile) WriteTo(w io.Writer, debug int) error {
	if p.name == "" {
		panic("pprof: use of zero Profile")
	}
	if p.write != nil {
		return p.write(w, debug)
	}

	// Obtain consistent snapshot under lock; then process without lock.
	p.mu.Lock()
	all := make([][]uintptr, 0, len(p.m))
	for _, stk := range p.m {
		all = append(all, stk)
	}
	p.mu.Unlock()

	// Map order is non-deterministic; make output deterministic.
	sort.Slice(all, func(i, j int) bool {
		t, u := all[i], all[j]
		for k := 0; k < len(t) && k < len(u); k++ {
			if t[k] != u[k] {
				return t[k] < u[k]
			}
		}
		return len(t) < len(u)
	})

	return printCountProfile(w, debug, p.name, stackProfile(all))
}

type stackProfile [][]uintptr

func (x stackProfile) Len() int              { return len(x) }
func (x stackProfile) Stack(i int) []uintptr { return x[i] }
func (x stackProfile) Label(i int) *labelMap { return nil }

// A countProfile is a set of stack traces to be printed as counts
// grouped by stack trace. There are multiple implementations:
// all that matters is that we can find out how many traces there are
// and obtain each trace in turn.
type countProfile interface {
	Len() int
	Stack(i int) []uintptr
	Label(i int) *labelMap
}

// printCountCycleProfile outputs block profile records (for block or mutex profiles)
// as the pprof-proto format output. Translations from cycle count to time duration
// are done because The proto expects count and time (nanoseconds) instead of count
// and the number of cycles for block, contention profiles.
func printCountCycleProfile(w io.Writer, countName, cycleName string, records []runtime.BlockProfileRecord) error {
	// Output profile in protobuf form.
	b := newProfileBuilder(w)
	b.pbValueType(tagProfile_PeriodType, countName, "count")
	b.pb.int64Opt(tagProfile_Period, 1)
	b.pbValueType(tagProfile_SampleType, countName, "count")
	b.pbValueType(tagProfile_SampleType, cycleName, "nanoseconds")

	cpuGHz := float64(runtime_cyclesPerSecond()) / 1e9

	values := []int64{0, 0}
	var locs []uint64
	for _, r := range records {
		values[0] = r.Count
		values[1] = int64(float64(r.Cycles) / cpuGHz)
		// For count profiles, all stack addresses are
		// return PCs, which is what appendLocsForStack expects.
		locs = b.appendLocsForStack(locs[:0], r.Stack())
		b.pbSample(values, locs, nil)
	}
	b.build()
	return nil
}

// printCountProfile prints a countProfile at the specified debug level.
// The profile will be in compressed proto format unless debug is nonzero.
func printCountProfile(w io.Writer, debug int, name string, p countProfile) error {
	// Build count of each stack.
	var buf strings.Builder
	key := func(stk []uintptr, lbls *labelMap) string {
		buf.Reset()
		fmt.Fprintf(&buf, "@")
		for _, pc := range stk {
			fmt.Fprintf(&buf, " %#x", pc)
		}
		if lbls != nil {
			buf.WriteString("\n# labels: ")
			buf.WriteString(lbls.String())
		}
		return buf.String()
	}
	count := map[string]int{}
	index := map[string]int{}
	var keys []string
	n := p.Len()
	for i := 0; i < n; i++ {
		k := key(p.Stack(i), p.Label(i))
		if count[k] == 0 {
			index[k] = i
			keys = append(keys, k)
		}
		count[k]++
	}

	sort.Sort(&keysByCount{keys, count})

	if debug > 0 {
		// Print debug profile in legacy format
		tw := tabwriter.NewWriter(w, 1, 8, 1, '\t', 0)
		fmt.Fprintf(tw, "%s profile: total %d\n", name, p.Len())
		for _, k := range keys {
			fmt.Fprintf(tw, "%d %s\n", count[k], k)
			printStackRecord(tw, p.Stack(index[k]), false)
		}
		return tw.Flush()
	}

	// Output profile in protobuf form.
	b := newProfileBuilder(w)
	b.pbValueType(tagProfile_PeriodType, name, "count")
	b.pb.int64Opt(tagProfile_Period, 1)
	b.pbValueType(tagProfile_SampleType, name, "count")

	values := []int64{0}
	var locs []uint64
	for _, k := range keys {
		values[0] = int64(count[k])
		// For count profiles, all stack addresses are
		// return PCs, which is what appendLocsForStack expects.
		locs = b.appendLocsForStack(locs[:0], p.Stack(index[k]))
		idx := index[k]
		var labels func()
		if p.Label(idx) != nil {
			labels = func() {
				for k, v := range *p.Label(idx) {
					b.pbLabel(tagSample_Label, k, v, 0)
				}
			}
		}
		b.pbSample(values, locs, labels)
	}
	b.build()
	return nil
}

// keysByCount sorts keys with higher counts first, breaking ties by key string order.
type keysByCount struct {
	keys  []string
	count map[string]int
}

func (x *keysByCount) Len() int      { return len(x.keys) }
func (x *keysByCount) Swap(i, j int) { x.keys[i], x.keys[j] = x.keys[j], x.keys[i] }
func (x *keysByCount) Less(i, j int) bool {
	ki, kj := x.keys[i], x.keys[j]
	ci, cj := x.count[ki], x.count[kj]
	if ci != cj {
		return ci > cj
	}
	return ki < kj
}

// printStackRecord prints the function + source line information
// for a single stack trace.
func printStackRecord(w io.Writer, stk []uintptr, allFrames bool) {
	show := allFrames
	frames := runtime.CallersFrames(stk)
	for {
		frame, more := frames.Next()
		name := frame.Function
		if name == "" {
			show = true
			fmt.Fprintf(w, "#\t%#x\n", frame.PC)
		} else if name != "runtime.goexit" && (show || !strings.HasPrefix(name, "runtime.")) {
			// Hide runtime.goexit and any runtime functions at the beginning.
			// This is useful mainly for allocation traces.
			show = true
			fmt.Fprintf(w, "#\t%#x\t%s+%#x\t%s:%d\n", frame.PC, name, frame.PC-frame.Entry, frame.File, frame.Line)
		}
		if !more {
			break
		}
	}
	if !show {
		// We didn't print anything; do it again,
		// and this time include runtime functions.
		printStackRecord(w, stk, true)
		return
	}
	fmt.Fprintf(w, "\n")
}

// Interface to system profiles.

// WriteHeapProfile is shorthand for [Lookup]("heap").WriteTo(w, 0).
// It is preserved for backwards compatibility.
func WriteHeapProfile(w io.Writer) error {
	return writeHeap(w, 0)
}

// countHeap returns the number of records in the heap profile.
func countHeap() int {
	n, _ := runtime.MemProfile(nil, true)
	return n
}

// writeHeap writes the current runtime heap profile to w.
func writeHeap(w io.Writer, debug int) error {
	return writeHeapInternal(w, debug, "")
}

// writeAlloc writes the current runtime heap profile to w
// with the total allocation space as the default sample type.
func writeAlloc(w io.Writer, debug int) error {
	return writeHeapInternal(w, debug, "alloc_space")
}

func writeHeapInternal(w io.Writer, debug int, defaultSampleType string) error {
	var memStats *runtime.MemStats
	if debug != 0 {
		// Read mem stats first, so that our other allocations
		// do not appear in the statistics.
		memStats = new(runtime.MemStats)
		runtime.ReadMemStats(memStats)
	}

	// Find out how many records there are (MemProfile(nil, true)),
	// allocate that many records, and get the data.
	// There's a race—more records might be added between
	// the two calls—so allocate a few extra records for safety
	// and also try again if we're very unlucky.
	// The loop should only execute one iteration in the common case.
	var p []runtime.MemProfileRecord
	n, ok := runtime.MemProfile(nil, true)
	for {
		// Allocate room for a slightly bigger profile,
		// in case a few more entries have been added
		// since the call to MemProfile.
		p = make([]runtime.MemProfileRecord, n+50)
		n, ok = runtime.MemProfile(p, true)
		if ok {
			p = p[0:n]
			break
		}
		// Profile grew; try again.
	}

	if debug == 0 {
		return writeHeapProto(w, p, int64(runtime.MemProfileRate), defaultSampleType)
	}

	sort.Slice(p, func(i, j int) bool { return p[i].InUseBytes() > p[j].InUseBytes() })

	b := bufio.NewWriter(w)
	tw := tabwriter.NewWriter(b, 1, 8, 1, '\t', 0)
	w = tw

	var total runtime.MemProfileRecord
	for i := range p {
		r := &p[i]
		total.AllocBytes += r.AllocBytes
		total.AllocObjects += r.AllocObjects
		total.FreeBytes += r.FreeBytes
		total.FreeObjects += r.FreeObjects
	}

	// Technically the rate is MemProfileRate not 2*MemProfileRate,
	// but early versions of the C++ heap profiler reported 2*MemProfileRate,
	// so that's what pprof has come to expect.
	rate := 2 * runtime.MemProfileRate

	// pprof reads a profile with alloc == inuse as being a "2-column" profile
	// (objects and bytes, not distinguishing alloc from inuse),
	// but then such a profile can't be merged using pprof *.prof with
	// other 4-column profiles where alloc != inuse.
	// The easiest way to avoid this bug is to adjust allocBytes so it's never == inuseBytes.
	// pprof doesn't use these header values anymore except for checking equality.
	inUseBytes := total.InUseBytes()
	allocBytes := total.AllocBytes
	if inUseBytes == allocBytes {
		allocBytes++
	}

	fmt.Fprintf(w, "heap profile: %d: %d [%d: %d] @ heap/%d\n",
		total.InUseObjects(), inUseBytes,
		total.AllocObjects, allocBytes,
		rate)

	for i := range p {
		r := &p[i]
		fmt.Fprintf(w, "%d: %d [%d: %d] @",
			r.InUseObjects(), r.InUseBytes(),
			r.AllocObjects, r.AllocBytes)
		for _, pc := range r.Stack() {
			fmt.Fprintf(w, " %#x", pc)
		}
		fmt.Fprintf(w, "\n")
		printStackRecord(w, r.Stack(), false)
	}

	// Print memstats information too.
	// Pprof will ignore, but useful for people
	s := memStats
	fmt.Fprintf(w, "\n# runtime.MemStats\n")
	fmt.Fprintf(w, "# Alloc = %d\n", s.Alloc)
	fmt.Fprintf(w, "# TotalAlloc = %d\n", s.TotalAlloc)
	fmt.Fprintf(w, "# Sys = %d\n", s.Sys)
	fmt.Fprintf(w, "# Lookups = %d\n", s.Lookups)
	fmt.Fprintf(w, "# Mallocs = %d\n", s.Mallocs)
	fmt.Fprintf(w, "# Frees = %d\n", s.Frees)

	fmt.Fprintf(w, "# HeapAlloc = %d\n", s.HeapAlloc)
	fmt.Fprintf(w, "# HeapSys = %d\n", s.HeapSys)
	fmt.Fprintf(w, "# HeapIdle = %d\n", s.HeapIdle)
	fmt.Fprintf(w, "# HeapInuse = %d\n", s.HeapInuse)
	fmt.Fprintf(w, "# HeapReleased = %d\n", s.HeapReleased)
	fmt.Fprintf(w, "# HeapObjects = %d\n", s.HeapObjects)

	fmt.Fprintf(w, "# Stack = %d / %d\n", s.StackInuse, s.StackSys)
	fmt.Fprintf(w, "# MSpan = %d / %d\n", s.MSpanInuse, s.MSpanSys)
	fmt.Fprintf(w, "# MCache = %d / %d\n", s.MCacheInuse, s.MCacheSys)
	fmt.Fprintf(w, "# BuckHashSys = %d\n", s.BuckHashSys)
	fmt.Fprintf(w, "# GCSys = %d\n", s.GCSys)
	fmt.Fprintf(w, "# OtherSys = %d\n", s.OtherSys)

	fmt.Fprintf(w, "# NextGC = %d\n", s.NextGC)
	fmt.Fprintf(w, "# LastGC = %d\n", s.LastGC)
	fmt.Fprintf(w, "# PauseNs = %d\n", s.PauseNs)
	fmt.Fprintf(w, "# PauseEnd = %d\n", s.PauseEnd)
	fmt.Fprintf(w, "# NumGC = %d\n", s.NumGC)
	fmt.Fprintf(w, "# NumForcedGC = %d\n", s.NumForcedGC)
	fmt.Fprintf(w, "# GCCPUFraction = %v\n", s.GCCPUFraction)
	fmt.Fprintf(w, "# DebugGC = %v\n", s.DebugGC)

	// Also flush out MaxRSS on supported platforms.
	addMaxRSS(w)

	tw.Flush()
	return b.Flush()
}

// countThreadCreate returns the size of the current ThreadCreateProfile.
func countThreadCreate() int {
	n, _ := runtime.ThreadCreateProfile(nil)
	return n
}

// writeThreadCreate writes the current runtime ThreadCreateProfile to w.
func writeThreadCreate(w io.Writer, debug int) error {
	// Until https://golang.org/issues/6104 is addressed, wrap
	// ThreadCreateProfile because there's no point in tracking labels when we
	// don't get any stack-traces.
	return writeRuntimeProfile(w, debug, "threadcreate", func(p []runtime.StackRecord, _ []unsafe.Pointer) (n int, ok bool) {
		return runtime.ThreadCreateProfile(p)
	})
}

// countGoroutine returns the number of goroutines.
func countGoroutine() int {
	return runtime.NumGoroutine()
}

// runtime_goroutineProfileWithLabels is defined in runtime/mprof.go
func runtime_goroutineProfileWithLabels(p []runtime.StackRecord, labels []unsafe.Pointer) (n int, ok bool)

// writeGoroutine writes the current runtime GoroutineProfile to w.
func writeGoroutine(w io.Writer, debug int) error {
	if debug >= 2 {
		return writeGoroutineStacks(w)
	}
	return writeRuntimeProfile(w, debug, "goroutine", runtime_goroutineProfileWithLabels)
}

func writeGoroutineStacks(w io.Writer) error {
	// We don't know how big the buffer needs to be to collect
	// all the goroutines. Start with 1 MB and try a few times, doubling each time.
	// Give up and use a truncated trace if 64 MB is not enough.
	buf := make([]byte, 1<<20)
	for i := 0; ; i++ {
		n := runtime.Stack(buf, true)
		if n < len(buf) {
			buf = buf[:n]
			break
		}
		if len(buf) >= 64<<20 {
			// Filled 64 MB - stop there.
			break
		}
		buf = make([]byte, 2*len(buf))
	}
	_, err := w.Write(buf)
	return err
}

func writeRuntimeProfile(w io.Writer, debug int, name string, fetch func([]runtime.StackRecord, []unsafe.Pointer) (int, bool)) error {
	// Find out how many records there are (fetch(nil)),
	// allocate that many records, and get the data.
	// There's a race—more records might be added between
	// the two calls—so allocate a few extra records for safety
	// and also try again if we're very unlucky.
	// The loop should only execute one iteration in the common case.
	var p []runtime.StackRecord
	var labels []unsafe.Pointer
	n, ok := fetch(nil, nil)
	for {
		// Allocate room for a slightly bigger profile,
		// in case a few more entries have been added
		// since the call to ThreadProfile.
		p = make([]runtime.StackRecord, n+10)
		labels = make([]unsafe.Pointer, n+10)
		n, ok = fetch(p, labels)
		if ok {
			p = p[0:n]
			break
		}
		// Profile grew; try again.
	}

	return printCountProfile(w, debug, name, &runtimeProfile{p, labels})
}

type runtimeProfile struct {
	stk    []runtime.StackRecord
	labels []unsafe.Pointer
}

func (p *runtimeProfile) Len() int              { return len(p.stk) }
func (p *runtimeProfile) Stack(i int) []uintptr { return p.stk[i].Stack() }
func (p *runtimeProfile) Label(i int) *labelMap { return (*labelMap)(p.labels[i]) }

var cpu struct {
	sync.Mutex
	profiling bool
	done      chan bool
}

// StartCPUProfile enables CPU profiling for the current process.
// While profiling, the profile will be buffered and written to w.
// StartCPUProfile returns an error if profiling is already enabled.
//
// On Unix-like systems, StartCPUProfile does not work by default for
// Go code built with -buildmode=c-archive or -buildmode=c-shared.
// StartCPUProfile relies on the SIGPROF signal, but that signal will
// be delivered to the main program's SIGPROF signal handler (if any)
// not to the one used by Go. To make it work, call [os/signal.Notify]
// for [syscall.SIGPROF], but note that doing so may break any profiling
// being done by the main program.
func StartCPUProfile(w io.Writer) error {
	// The runtime routines allow a variable profiling rate,
	// but in practice operating systems cannot trigger signals
	// at more than about 500 Hz, and our processing of the
	// signal is not cheap (mostly getting the stack trace).
	// 100 Hz is a reasonable choice: it is frequent enough to
	// produce useful data, rare enough not to bog down the
	// system, and a nice round number to make it easy to
	// convert sample counts to seconds. Instead of requiring
	// each client to specify the frequency, we hard code it.
	const hz = 100

	cpu.Lock()
	defer cpu.Unlock()
	if cpu.done == nil {
		cpu.done = make(chan bool)
	}
	// Double-check.
	if cpu.profiling {
		return fmt.Errorf("cpu profiling already in use")
	}
	cpu.profiling = true
	runtime.SetCPUProfileRate(hz)
	go profileWriter(w)
	return nil
}

// readProfile, provided by the runtime, returns the next chunk of
// binary CPU profiling stack trace data, blocking until data is available.
// If profiling is turned off and all the profile data accumulated while it was
// on has been returned, readProfile returns eof=true.
// The caller must save the returned data and tags before calling readProfile again.
func readProfile() (data []uint64, tags []unsafe.Pointer, eof bool)

func profileWriter(w io.Writer) {
	b := newProfileBuilder(w)
	var err error
	for {
		time.Sleep(100 * time.Millisecond)
		data, tags, eof := readProfile()
		if e := b.addCPUData(data, tags); e != nil && err == nil {
			err = e
		}
		if eof {
			break
		}
	}
	if err != nil {
		// The runtime should never produce an invalid or truncated profile.
		// It drops records that can't fit into its log buffers.
		panic("runtime/pprof: converting profile: " + err.Error())
	}
	b.build()
	cpu.done <- true
}

// StopCPUProfile stops the current CPU profile, if any.
// StopCPUProfile only returns after all the writes for the
// profile have completed.
func StopCPUProfile() {
	cpu.Lock()
	defer cpu.Unlock()

	if !cpu.profiling {
		return
	}
	cpu.profiling = false
	runtime.SetCPUProfileRate(0)
	<-cpu.done
}

// countBlock returns the number of records in the blocking profile.
func countBlock() int {
	n, _ := runtime.BlockProfile(nil)
	return n
}

// countMutex returns the number of records in the mutex profile.
func countMutex() int {
	n, _ := runtime.MutexProfile(nil)
	return n
}

// writeBlock writes the current blocking profile to w.
func writeBlock(w io.Writer, debug int) error {
	return writeProfileInternal(w, debug, "contention", runtime.BlockProfile)
}

// writeMutex writes the current mutex profile to w.
func writeMutex(w io.Writer, debug int) error {
	return writeProfileInternal(w, debug, "mutex", runtime.MutexProfile)
}

// writeProfileInternal writes the current blocking or mutex profile depending on the passed parameters.
func writeProfileInternal(w io.Writer, debug int, name string, runtimeProfile func([]runtime.BlockProfileRecord) (int, bool)) error {
	var p []runtime.BlockProfileRecord
	n, ok := runtimeProfile(nil)
	for {
		p = make([]runtime.BlockProfileRecord, n+50)
		n, ok = runtimeProfile(p)
		if ok {
			p = p[:n]
			break
		}
	}

	sort.Slice(p, func(i, j int) bool { return p[i].Cycles > p[j].Cycles })

	if debug <= 0 {
		return printCountCycleProfile(w, "contentions", "delay", p)
	}

	b := bufio.NewWriter(w)
	tw := tabwriter.NewWriter(w, 1, 8, 1, '\t', 0)
	w = tw

	fmt.Fprintf(w, "--- %v:\n", name)
	fmt.Fprintf(w, "cycles/second=%v\n", runtime_cyclesPerSecond())
	if name == "mutex" {
		fmt.Fprintf(w, "sampling period=%d\n", runtime.SetMutexProfileFraction(-1))
	}
	for i := range p {
		r := &p[i]
		fmt.Fprintf(w, "%v %v @", r.Cycles, r.Count)
		for _, pc := range r.Stack() {
			fmt.Fprintf(w, " %#x", pc)
		}
		fmt.Fprint(w, "\n")
		if debug > 0 {
			printStackRecord(w, r.Stack(), true)
		}
	}

	if tw != nil {
		tw.Flush()
	}
	return b.Flush()
}

func runtime_cyclesPerSecond() int64

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