f7 16 nosplit call f8
f8 16 nosplit call end
end 1000
REJECT

# Two paths both go over the stack limit.
start 0 call f1
f1 80 nosplit call f2 call f3
f2 40 nosplit call f4
f3 96 nosplit
f4 40 nosplit
REJECT

# Test cases near the 128-byte limit.

# Ordinary stack split frame is always okay.
start 112
start 116
start 120
start 124
start 128
start 132
start 136

				return c, d
			}
			if uintptr(unsafe.Pointer(d))+unsafe.Sizeof(*c) == uintptr(unsafe.Pointer(c)) {
				return d, c
			}
		}
		s = append(s, c)
	}
}

// Make sure an empty slice on the stack doesn't pin the next object in memory.
func TestEmptySlice(t *testing.T) {
	x, y := adjChunks()

	// the pointer inside xs points to y.
	xs := x[objsize:] // change objsize to objsize-1 and the test passes

func (p *Prog) InnermostFilename() string {
	// TODO For now, this is only used for debugging output, and if we need more/better information, it might change.
	// An example of what we might want to see is the full stack of positions for inlined code, so we get some visibility into what is recorded there.
	pos := p.Ctxt.InnermostPos(p.Pos)
	if !pos.IsKnown() {
		return "<unknown file name>"
	}
	return pos.Filename()
}

	// in particular, note that WebGL2's texImage2D takes up to 10 arguments
	const maxStackArgs = 16
	if size <= maxStackArgs {
		// as long as makeArgs is inlined, these will be stack-allocated
		argVals = make([]Value, size, maxStackArgs)
		argRefs = make([]ref, size, maxStackArgs)
	} else {
		// allocates on the heap, but exceeding maxStackArgs should be rare
		argVals = make([]Value, size)

func NewCFBDecrypter(block Block, iv []byte) Stream {
	return newCFB(block, iv, true)
}

func newCFB(block Block, iv []byte, decrypt bool) Stream {
	blockSize := block.BlockSize()
	if len(iv) != blockSize {
		// stack trace will indicate whether it was de or encryption
		panic("cipher.newCFB: IV length must equal block size")
	}
	x := &cfb{
		b:       block,
		out:     make([]byte, blockSize),
		next:    make([]byte, blockSize),

package runtime

import "unsafe"

// Call fn with arg as its argument. Return what fn returns.
// fn is the raw pc value of the entry point of the desired function.
// Switches to the system stack, if not already there.
// Preserves the calling point as the location where a profiler traceback will begin.
//
//go:nosplit
func libcCall(fn, arg unsafe.Pointer) int32 {
	// Leave caller's PC/SP/G around for traceback.

	fs uint16
	gs uint16

	_type uint64
	error uint64 /* error code (or zero) */
	ip    uint64 /* pc */
	cs    uint64 /* old context */
	flags uint64 /* old flags */
	sp    uint64 /* sp */
	ss    uint64 /* old stack segment */
}

type sigctxt struct {
	u *ureg
}

//go:nosplit
//go:nowritebarrierrec
func (c *sigctxt) pc() uintptr { return uintptr(c.u.ip) }

func (c *sigctxt) sp() uintptr { return uintptr(c.u.sp) }

package sys

// NOTE: keep in sync with cmd/compile/internal/types.CalcSize
// to make the compiler recognize this as an intrinsic type.
type nih struct{}

// NotInHeap is a type must never be allocated from the GC'd heap or on the stack,
// and is called not-in-heap.
//
// Other types can embed NotInHeap to make it not-in-heap. Specifically, pointers
// to these types must always fail the `runtime.inheap` check. The type may be used

// Version of newosproc that doesn't require a valid G.
//
//go:nosplit
func newosproc0(stacksize uintptr, fn unsafe.Pointer) {
	stack := sysAlloc(stacksize, &memstats.stacks_sys)
	if stack == nil {
		writeErrStr(failallocatestack)
		exit(1)
	}
	ret := clone(cloneFlags, unsafe.Pointer(uintptr(stack)+stacksize), nil, nil, fn)
	if ret < 0 {
		writeErrStr(failthreadcreate)
		exit(1)
	}
}

const (

func Logf(ctx context.Context, category, format string, args ...any) {
	if IsEnabled() {
		// Ideally this should be just Log, but that will
		// add one more frame in the stack trace.
		id := fromContext(ctx).id
		userLog(id, category, fmt.Sprintf(format, args...))
	}
}

const (
	regionStartCode = uint64(0)
	regionEndCode   = uint64(1)
)