mirror of
https://github.com/golang/go
synced 2024-11-19 18:24:39 -07:00
b2a950bb73
Rename "gothrow" to "throw" now that the C version of "throw" is no longer needed. This change is purely mechanical except in panic.go where the old version of "throw" has been deleted. sed -i "" 's/[[:<:]]gothrow[[:>:]]/throw/g' runtime/*.go Change-Id: Icf0752299c35958b92870a97111c67bcd9159dc3 Reviewed-on: https://go-review.googlesource.com/2150 Reviewed-by: Minux Ma <minux@golang.org> Reviewed-by: Dave Cheney <dave@cheney.net>
89 lines
2.4 KiB
Go
89 lines
2.4 KiB
Go
// Copyright 2010 The Go 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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// +build dragonfly freebsd nacl netbsd openbsd solaris
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package runtime
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import "unsafe"
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//go:nosplit
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func sysAlloc(n uintptr, stat *uint64) unsafe.Pointer {
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v := unsafe.Pointer(mmap(nil, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_PRIVATE, -1, 0))
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if uintptr(v) < 4096 {
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return nil
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}
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xadd64(stat, int64(n))
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return v
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}
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func sysUnused(v unsafe.Pointer, n uintptr) {
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madvise(v, n, _MADV_FREE)
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}
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func sysUsed(v unsafe.Pointer, n uintptr) {
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}
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func sysFree(v unsafe.Pointer, n uintptr, stat *uint64) {
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xadd64(stat, -int64(n))
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munmap(v, n)
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}
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func sysFault(v unsafe.Pointer, n uintptr) {
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mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE|_MAP_FIXED, -1, 0)
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}
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func sysReserve(v unsafe.Pointer, n uintptr, reserved *bool) unsafe.Pointer {
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// On 64-bit, people with ulimit -v set complain if we reserve too
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// much address space. Instead, assume that the reservation is okay
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// and check the assumption in SysMap.
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if ptrSize == 8 && uint64(n) > 1<<32 || goos_nacl != 0 {
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*reserved = false
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return v
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}
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p := unsafe.Pointer(mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE, -1, 0))
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if uintptr(p) < 4096 {
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return nil
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}
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*reserved = true
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return p
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}
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func sysMap(v unsafe.Pointer, n uintptr, reserved bool, stat *uint64) {
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const _ENOMEM = 12
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xadd64(stat, int64(n))
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// On 64-bit, we don't actually have v reserved, so tread carefully.
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if !reserved {
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flags := int32(_MAP_ANON | _MAP_PRIVATE)
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if GOOS == "dragonfly" {
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// TODO(jsing): For some reason DragonFly seems to return
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// memory at a different address than we requested, even when
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// there should be no reason for it to do so. This can be
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// avoided by using MAP_FIXED, but I'm not sure we should need
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// to do this - we do not on other platforms.
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flags |= _MAP_FIXED
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}
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p := mmap(v, n, _PROT_READ|_PROT_WRITE, flags, -1, 0)
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if uintptr(p) == _ENOMEM {
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throw("runtime: out of memory")
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}
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if p != v {
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print("runtime: address space conflict: map(", v, ") = ", p, "\n")
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throw("runtime: address space conflict")
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}
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return
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}
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p := mmap(v, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_FIXED|_MAP_PRIVATE, -1, 0)
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if uintptr(p) == _ENOMEM {
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throw("runtime: out of memory")
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}
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if p != v {
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throw("runtime: cannot map pages in arena address space")
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}
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}
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