package runtime

import (
	"internal/runtime/atomic"
	"unsafe"
)

const (
	_EACCES = 13
	_EINVAL = 22
)

// Don't split the stack as this method may be invoked without a valid G, which
// prevents us from allocating more stack.
//
//go:nosplit
func sysAllocOS(n uintptr) unsafe.Pointer {
	p, err := mmap(nil, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_PRIVATE, -1, 0)
	if err != 0 {

		}
		v >>= 7
		pos++
	}
	if v != 0 {
		throw("v could not fit in traceBytesPerNumber")
	}
}

// traceBufFlush flushes a trace buffer.
//
// Must run on the system stack because trace.lock must be held.
//
//go:systemstack
func traceBufFlush(buf *traceBuf, gen uintptr) {
	assertLockHeld(&trace.lock)

	// Write out the non-header length of the batch in the header.
	//

	rec := []profilerecord.MemProfileRecord{
		{AllocBytes: 4096, FreeBytes: 1024, AllocObjects: 4, FreeObjects: 1, Stack: []uintptr{a1, a2}},
		{AllocBytes: 512 * 1024, FreeBytes: 0, AllocObjects: 1, FreeObjects: 0, Stack: []uintptr{a2 + 1, a2 + 2}},
		{AllocBytes: 512 * 1024, FreeBytes: 512 * 1024, AllocObjects: 1, FreeObjects: 1, Stack: []uintptr{a1 + 1, a1 + 2, a2 + 3}},
	}

	periodType := &profile.ValueType{Type: "space", Unit: "bytes"}

	if err != 0 || uintptr(a) != s.base() {
		print("runtime: remapping stack memory ", hex(s.base()), " ", s.npages*pageSize, " a=", a, " err=", err, "\n")
		throw("remapping stack memory failed")
	}
}

//go:nosplit
func raise(sig uint32) {
	thrkill(getthrid(), int(sig))
}

func signalM(mp *m, sig int) {

)

func assert(p bool) {
	if !p {
		msg := "assertion failed"
		// Include information about the assertion location. Due to panic recovery,
		// this location is otherwise buried in the middle of the panicking stack.
		if _, file, line, ok := runtime.Caller(1); ok {
			msg = fmt.Sprintf("%s:%d: %s", file, line, msg)
		}
		panic(msg)
	}
}

// An errorDesc describes part of a type-checking error.
type errorDesc struct {

func thrkill(tid int32, sig int) {
	libcCall(unsafe.Pointer(abi.FuncPCABI0(thrkill_trampoline)), unsafe.Pointer(&tid))
}
func thrkill_trampoline()

// mmap is used to do low-level memory allocation via mmap. Don't allow stack
// splits, since this function (used by sysAlloc) is called in a lot of low-level
// parts of the runtime and callers often assume it won't acquire any locks.
//
//go:nosplit

//     "udp", with a wildcard address: If the platform supports
//     both IPv6 and IPv4-mapped IPv6 communication capabilities,
//     or does not support IPv4, we use a dual stack, AF_INET6 and
//     IPV6_V6ONLY=0, wildcard address listen. The dual stack
//     wildcard address listen may fall back to an IPv6-only,
//     AF_INET6 and IPV6_V6ONLY=1, wildcard address listen.
//     Otherwise we prefer an IPv4-only, AF_INET, wildcard address

	exc uint32 // number of arm exception taken
}

type regs64 struct {
	x     [29]uint64 // registers x0 to x28
	fp    uint64     // frame register, x29
	lr    uint64     // link register, x30
	sp    uint64     // stack pointer, x31
	pc    uint64     // program counter
	cpsr  uint32     // current program status register
	__pad uint32
}

type neonstate64 struct {
	v    [64]uint64 // actually [32]uint128
	fpsr uint32

func Inc(name string) {
	counter.Inc(name)
}

// NewCounter returns a counter with the given name.
func NewCounter(name string) *counter.Counter {
	return counter.New(name)
}

// NewStackCounter returns a new stack counter with the given name and depth.
func NewStackCounter(name string, depth int) *counter.StackCounter {
	return counter.NewStack(name, depth)
}

// CountFlags creates a counter for every flag that is set

// Decode returns the Unicode code point sequence represented
// by the UTF-16 encoding s.
func Decode(s []uint16) []rune {
	// Preallocate capacity to hold up to 64 runes.
	// Decode inlines, so the allocation can live on the stack.
	buf := make([]rune, 0, 64)
	return decode(s, buf)
}

// decode appends to buf the Unicode code point sequence represented
// by the UTF-16 encoding s and return the extended buffer.