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

package runtime

import (
	"internal/goarch"
	"runtime/internal/sys"
	"unsafe"
)

type m0Stack struct {
	_ [8192 * sys.StackGuardMultiplier]byte
}

var wasmStack m0Stack

func wasmDiv()

func wasmTruncS()
func wasmTruncU()

//go:wasmimport gojs runtime.wasmExit
func wasmExit(code int32)

	JMP	msancall<>(SB)

// Switches SP to g0 stack and calls (FARG). Arguments already set.
TEXT	msancall<>(SB), NOSPLIT, $0-0
	MOVD	RSP, R19                  // callee-saved
	CBZ	g, g0stack                // no g, still on a system stack
	MOVD	g_m(g), R10
	MOVD	m_g0(R10), R11
	CMP	R11, g
	BEQ	g0stack

	MOVD	(g_sched+gobuf_sp)(R11), R4
	MOVD	R4, RSP

g0stack:
	BL	(FARG)
	MOVD	R19, RSP

	b10.Event("GoStop", "whatever", testgen.NoStack)

	// The running goroutine gets unblocked.
	b11 := g1.Batch(trace.ThreadID(1), 0)
	b11.Event("ProcStatus", trace.ProcID(1), go122.ProcRunning)
	b11.Event("GoStart", trace.GoID(1), testgen.Seq(1))
	b11.Event("GoStop", "whatever", testgen.NoStack)

	g2 := t.Generation(2)

	// Start running the goroutine, but later.

func (gs *gState[R]) setStartCause(ts trace.Time, name string, resource uint64, stack trace.Stack) {
	gs.startCause.time = ts
	gs.startCause.name = name
	gs.startCause.resource = resource
	gs.startCause.stack = stack
}

// created indicates that this goroutine was just created by the provided creator.
func (gs *gState[R]) created(ts trace.Time, creator R, stack trace.Stack) {
	if creator == R(noResource) {
		return
	}

import (
	"text/scanner"

	"cmd/internal/src"
)

// A Stack is a stack of TokenReaders. As the top TokenReader hits EOF,
// it resumes reading the next one down.
type Stack struct {
	tr []TokenReader
}

// Push adds tr to the top (end) of the input stack. (Popping happens automatically.)
func (s *Stack) Push(tr TokenReader) {
	s.tr = append(s.tr, tr)
}

func (s *Stack) Next() ScanToken {
	tos := s.tr[len(s.tr)-1]

	//
	// This value must be multiplied by the stack guard multiplier, so do not
	// use it directly. See runtime/stack.go:stackNosplit and
	// cmd/internal/objabi/stack.go:StackNosplit.
	StackNosplitBase = 800

	// We have three different sequences for stack bounds checks, depending on
	// whether the stack frame of a function is small, big, or huge.

	// After a stack split check the SP is allowed to be StackSmall bytes below

)

// PrintStack prints to standard error the stack trace returned by runtime.Stack.
func PrintStack() {
	os.Stderr.Write(Stack())
}

// Stack returns a formatted stack trace of the goroutine that calls it.
// It calls [runtime.Stack] with a large enough buffer to capture the entire trace.
func Stack() []byte {
	buf := make([]byte, 1024)
	for {
		n := runtime.Stack(buf, false)
		if n < len(buf) {
			return buf[:n]
		}

// Copyright 2009 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.

// Test stack splitting code.
// Try to tickle stack splitting bugs by doing
// go, defer, and closure calls at different stack depths.

package main

type T [20]int

func g(c chan int, t T) {
	s := 0
	for i := 0; i < len(t); i++ {
		s += t[i]
	}
	c <- s
}

	g.strings[s] = id
	return id
}

// Stack registers a stack with the trace.
//
// This is a convenience function for easily adding correct
// stacks to traces.
func (g *Generation) Stack(stk []trace.StackFrame) uint64 {
	if len(stk) == 0 {
		return 0
	}
	if len(stk) > 32 {
		panic("stack too big for test")
	}
	var stkc stack
	copy(stkc.stk[:], stk)
	stkc.len = len(stk)

	g2 := t.Generation(2)

	// That same goroutine emits a task end in the following generation.
	b2 := g2.Batch(trace.ThreadID(0), 5)
	b2.Event("ProcStatus", trace.ProcID(0), go122.ProcRunning)
	b2.Event("GoStatus", trace.GoID(1), trace.ThreadID(0), go122.GoRunning)
	b2.Event("UserTaskEnd", trace.TaskID(2), testgen.NoStack)