148 lines
3.3 KiB
Go
148 lines
3.3 KiB
Go
//
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// Copyright 2024 CloudWeGo Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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package x86_64
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import (
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`encoding/binary`
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`errors`
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`reflect`
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`strconv`
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`unicode/utf8`
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`unsafe`
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)
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const (
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_CC_digit = 1 << iota
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_CC_ident
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_CC_ident0
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_CC_number
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)
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func ispow2(v uint64) bool {
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return (v & (v - 1)) == 0
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}
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func isdigit(cc rune) bool {
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return '0' <= cc && cc <= '9'
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}
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func isalpha(cc rune) bool {
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return (cc >= 'a' && cc <= 'z') || (cc >= 'A' && cc <= 'Z')
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}
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func isident(cc rune) bool {
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return cc == '_' || isalpha(cc) || isdigit(cc)
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}
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func isident0(cc rune) bool {
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return cc == '_' || isalpha(cc)
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}
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func isnumber(cc rune) bool {
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return (cc == 'b' || cc == 'B') ||
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(cc == 'o' || cc == 'O') ||
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(cc == 'x' || cc == 'X') ||
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(cc >= '0' && cc <= '9') ||
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(cc >= 'a' && cc <= 'f') ||
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(cc >= 'A' && cc <= 'F')
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}
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func align(v int, n int) int {
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return (((v - 1) >> n) + 1) << n
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}
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func append8(m *[]byte, v byte) {
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*m = append(*m, v)
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}
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func append16(m *[]byte, v uint16) {
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p := len(*m)
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*m = append(*m, 0, 0)
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binary.LittleEndian.PutUint16((*m)[p:], v)
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}
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func append32(m *[]byte, v uint32) {
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p := len(*m)
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*m = append(*m, 0, 0, 0, 0)
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binary.LittleEndian.PutUint32((*m)[p:], v)
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}
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func append64(m *[]byte, v uint64) {
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p := len(*m)
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*m = append(*m, 0, 0, 0, 0, 0, 0, 0, 0)
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binary.LittleEndian.PutUint64((*m)[p:], v)
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}
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func expandmm(m *[]byte, n int, v byte) {
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sl := (*_GoSlice)(unsafe.Pointer(m))
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nb := sl.len + n
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/* grow as needed */
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if nb > cap(*m) {
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*m = growslice(byteType, *m, nb)
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}
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/* fill the new area */
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memset(unsafe.Pointer(uintptr(sl.ptr) + uintptr(sl.len)), v, uintptr(n))
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sl.len = nb
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}
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func memset(p unsafe.Pointer, c byte, n uintptr) {
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if c != 0 {
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memsetv(p, c, n)
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} else {
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memclrNoHeapPointers(p, n)
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}
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}
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func memsetv(p unsafe.Pointer, c byte, n uintptr) {
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for i := uintptr(0); i < n; i++ {
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*(*byte)(unsafe.Pointer(uintptr(p) + i)) = c
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}
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}
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func literal64(v string) (uint64, error) {
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var nb int
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var ch rune
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var ex error
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var mm [12]byte
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/* unquote the runes */
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for v != "" {
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if ch, _, v, ex = strconv.UnquoteChar(v, '\''); ex != nil {
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return 0, ex
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} else if nb += utf8.EncodeRune(mm[nb:], ch); nb > 8 {
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return 0, errors.New("multi-char constant too large")
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}
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}
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/* convert to uint64 */
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return *(*uint64)(unsafe.Pointer(&mm)), nil
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}
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var (
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byteWrap = reflect.TypeOf(byte(0))
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byteType = (*_GoType)(efaceOf(byteWrap).ptr)
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)
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//go:linkname growslice runtime.growslice
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func growslice(_ *_GoType, _ []byte, _ int) []byte
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//go:noescape
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//go:linkname memclrNoHeapPointers runtime.memclrNoHeapPointers
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func memclrNoHeapPointers(_ unsafe.Pointer, _ uintptr)
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