forked from jshiffer/matterbridge
80 lines
2.2 KiB
Go
80 lines
2.2 KiB
Go
// Copyright 2020 The Libc Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build ((amd64 || arm64 || loong64) && !linux) || ppc64le || riscv64 || s390x || mips64le
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package libc // import "modernc.org/libc"
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import (
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"unsafe"
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"modernc.org/libc/limits"
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"modernc.org/libc/sys/types"
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)
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const (
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heapSize = 2 << 30 // Adjust for your debugging session requirements and system RAM size.
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)
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type (
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// RawMem represents the biggest byte array the runtime can handle
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RawMem [1<<50 - 1]byte
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// 48-5*8 = 8 bytes left to pad
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stackHeaderPadding struct {
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a uintptr
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}
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)
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type bits []int
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func newBits(n int) (r bits) { return make(bits, (n+63)>>6) }
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func (b bits) has(n int) bool { return b != nil && b[n>>6]&(1<<uint(n&63)) != 0 }
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func (b bits) set(n int) { b[n>>6] |= 1 << uint(n&63) }
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func Xstrchrnul(tls *TLS, s uintptr, c int32) (r uintptr) {
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if __ccgo_strace {
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trc("tls=%v s=%v c=%v, (%v:)", tls, s, c, origin(2))
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defer func() { trc("-> %v", r) }()
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}
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var k types.Size_t
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var w uintptr
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_, _ = k, w
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c = int32(uint8(uint8(c)))
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if !(c != 0) {
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return s + uintptr(Xstrlen(tls, s))
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}
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for {
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if !(uint64(uint64(s))%Uint64FromInt64(8) != 0) {
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break
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}
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if !(*(*int8)(unsafe.Pointer(s)) != 0) || int32(*(*uint8)(unsafe.Pointer(s))) == c {
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return s
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}
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goto _1
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_1:
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s++
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}
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k = uint64(-Int32FromInt32(1)) / Uint64FromInt32(limits.UCHAR_MAX) * uint64(uint64(c))
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w = s
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for {
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if !(!((*(*uint64)(unsafe.Pointer(w))-uint64(-Int32FromInt32(1))/Uint64FromInt32(limits.UCHAR_MAX)) & ^*(*uint64)(unsafe.Pointer(w)) & (uint64(-Int32FromInt32(1))/Uint64FromInt32(limits.UCHAR_MAX)*uint64(Int32FromInt32(limits.UCHAR_MAX)/Int32FromInt32(2)+Int32FromInt32(1))) != 0) && !((*(*uint64)(unsafe.Pointer(w))^k-uint64(-Int32FromInt32(1))/Uint64FromInt32(limits.UCHAR_MAX)) & ^(*(*uint64)(unsafe.Pointer(w))^k) & (uint64(-Int32FromInt32(1))/Uint64FromInt32(limits.UCHAR_MAX)*uint64(Int32FromInt32(limits.UCHAR_MAX)/Int32FromInt32(2)+Int32FromInt32(1))) != 0)) {
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break
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}
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goto _2
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_2:
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w += 8
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}
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s = w
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for {
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if !(*(*int8)(unsafe.Pointer(s)) != 0 && int32(*(*uint8)(unsafe.Pointer(s))) != c) {
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break
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}
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goto _3
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_3:
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s++
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}
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return s
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}
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