mirror of
https://github.com/golang/go
synced 2024-11-20 08:24:42 -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.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// +build dragonfly freebsd nacl netbsd openbsd solaris
|
|
|
|
package runtime
|
|
|
|
import "unsafe"
|
|
|
|
//go:nosplit
|
|
func sysAlloc(n uintptr, stat *uint64) unsafe.Pointer {
|
|
v := unsafe.Pointer(mmap(nil, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_PRIVATE, -1, 0))
|
|
if uintptr(v) < 4096 {
|
|
return nil
|
|
}
|
|
xadd64(stat, int64(n))
|
|
return v
|
|
}
|
|
|
|
func sysUnused(v unsafe.Pointer, n uintptr) {
|
|
madvise(v, n, _MADV_FREE)
|
|
}
|
|
|
|
func sysUsed(v unsafe.Pointer, n uintptr) {
|
|
}
|
|
|
|
func sysFree(v unsafe.Pointer, n uintptr, stat *uint64) {
|
|
xadd64(stat, -int64(n))
|
|
munmap(v, n)
|
|
}
|
|
|
|
func sysFault(v unsafe.Pointer, n uintptr) {
|
|
mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE|_MAP_FIXED, -1, 0)
|
|
}
|
|
|
|
func sysReserve(v unsafe.Pointer, n uintptr, reserved *bool) unsafe.Pointer {
|
|
// On 64-bit, people with ulimit -v set complain if we reserve too
|
|
// much address space. Instead, assume that the reservation is okay
|
|
// and check the assumption in SysMap.
|
|
if ptrSize == 8 && uint64(n) > 1<<32 || goos_nacl != 0 {
|
|
*reserved = false
|
|
return v
|
|
}
|
|
|
|
p := unsafe.Pointer(mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE, -1, 0))
|
|
if uintptr(p) < 4096 {
|
|
return nil
|
|
}
|
|
*reserved = true
|
|
return p
|
|
}
|
|
|
|
func sysMap(v unsafe.Pointer, n uintptr, reserved bool, stat *uint64) {
|
|
const _ENOMEM = 12
|
|
|
|
xadd64(stat, int64(n))
|
|
|
|
// On 64-bit, we don't actually have v reserved, so tread carefully.
|
|
if !reserved {
|
|
flags := int32(_MAP_ANON | _MAP_PRIVATE)
|
|
if GOOS == "dragonfly" {
|
|
// TODO(jsing): For some reason DragonFly seems to return
|
|
// memory at a different address than we requested, even when
|
|
// there should be no reason for it to do so. This can be
|
|
// avoided by using MAP_FIXED, but I'm not sure we should need
|
|
// to do this - we do not on other platforms.
|
|
flags |= _MAP_FIXED
|
|
}
|
|
p := mmap(v, n, _PROT_READ|_PROT_WRITE, flags, -1, 0)
|
|
if uintptr(p) == _ENOMEM {
|
|
throw("runtime: out of memory")
|
|
}
|
|
if p != v {
|
|
print("runtime: address space conflict: map(", v, ") = ", p, "\n")
|
|
throw("runtime: address space conflict")
|
|
}
|
|
return
|
|
}
|
|
|
|
p := mmap(v, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_FIXED|_MAP_PRIVATE, -1, 0)
|
|
if uintptr(p) == _ENOMEM {
|
|
throw("runtime: out of memory")
|
|
}
|
|
if p != v {
|
|
throw("runtime: cannot map pages in arena address space")
|
|
}
|
|
}
|