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// Copyright 2023 The Libc Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build !libc.membrk && !libc.memgrind && linux && (amd64 || arm64 || loong64)
package libc // import "modernc.org/libc"
import (
"math"
mbits "math/bits"
"modernc.org/memory"
)
const (
isMemBrk = false
)
func Xmalloc(tls *TLS, n Tsize_t) (r uintptr) {
if __ccgo_strace {
trc("tls=%v n=%v, (%v:)", tls, n, origin(2))
defer func() { trc("-> %v", r) }()
}
if n > math.MaxInt {
tls.setErrno(ENOMEM)
return 0
}
allocatorMu.Lock()
defer allocatorMu.Unlock()
if n == 0 {
// malloc(0) should return unique pointers
// (often expected and gnulib replaces malloc if malloc(0) returns 0)
n = 1
}
var err error
if r, err = allocator.UintptrMalloc(int(n)); err != nil {
r = 0
tls.setErrno(ENOMEM)
}
return r
}
func Xcalloc(tls *TLS, m Tsize_t, n Tsize_t) (r uintptr) {
if __ccgo_strace {
trc("tls=%v m=%v n=%v, (%v:)", tls, m, n, origin(2))
defer func() { trc("-> %v", r) }()
}
hi, rq := mbits.Mul(uint(m), uint(n))
if hi != 0 || rq > math.MaxInt {
tls.setErrno(ENOMEM)
return 0
}
allocatorMu.Lock()
defer allocatorMu.Unlock()
if rq == 0 {
rq = 1
}
var err error
if r, err = allocator.UintptrCalloc(int(rq)); err != nil {
r = 0
tls.setErrno(ENOMEM)
}
return r
}
func Xrealloc(tls *TLS, p uintptr, n Tsize_t) (r uintptr) {
if __ccgo_strace {
trc("tls=%v p=%v n=%v, (%v:)", tls, p, n, origin(2))
defer func() { trc("-> %v", r) }()
}
allocatorMu.Lock()
defer allocatorMu.Unlock()
var err error
if r, err = allocator.UintptrRealloc(p, int(n)); err != nil {
r = 0
tls.setErrno(ENOMEM)
}
return r
}
func Xfree(tls *TLS, p uintptr) {
if __ccgo_strace {
trc("tls=%v p=%v, (%v:)", tls, p, origin(2))
}
allocatorMu.Lock()
defer allocatorMu.Unlock()
allocator.UintptrFree(p)
}
func Xmalloc_usable_size(tls *TLS, p uintptr) (r Tsize_t) {
if __ccgo_strace {
trc("tls=%v p=%v, (%v:)", tls, p, origin(2))
defer func() { trc("-> %v", r) }()
}
if p == 0 {
return 0
}
allocatorMu.Lock()
defer allocatorMu.Unlock()
return Tsize_t(memory.UintptrUsableSize(p))
}
func MemAudit() (r []*MemAuditError) {
return nil
}
func UsableSize(p uintptr) Tsize_t {
allocatorMu.Lock()
defer allocatorMu.Unlock()
return Tsize_t(memory.UintptrUsableSize(p))
}
// MemAuditStart locks the memory allocator, initializes and enables memory
// auditing. Finaly it unlocks the memory allocator.
//
// Some memory handling errors, like double free or freeing of unallocated
// memory, will panic when memory auditing is enabled.
//
// This memory auditing functionality has to be enabled using the libc.memgrind
// build tag.
//
// It is intended only for debug/test builds. It slows down memory allocation
// routines and it has additional memory costs.
func MemAuditStart() {}
// MemAuditReport locks the memory allocator, reports memory leaks, if any.
// Finally it disables memory auditing and unlocks the memory allocator.
//
// This memory auditing functionality has to be enabled using the libc.memgrind
// build tag.
//
// It is intended only for debug/test builds. It slows down memory allocation
// routines and it has additional memory costs.
func MemAuditReport() error { return nil }
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