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checked_allocator.go
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/
checked_allocator.go
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package memory
import (
"os"
"runtime"
"strconv"
"sync"
"sync/atomic"
"unsafe"
)
type CheckedAllocator struct {
mem Allocator
sz int64
allocs sync.Map
}
func NewCheckedAllocator(mem Allocator) *CheckedAllocator {
return &CheckedAllocator{mem: mem}
}
func (a *CheckedAllocator) CurrentAlloc() int { return int(atomic.LoadInt64(&a.sz)) }
func (a *CheckedAllocator) Allocate(size int) []byte {
atomic.AddInt64(&a.sz, int64(size))
out := a.mem.Allocate(size)
if size == 0 {
return out
}
ptr := uintptr(unsafe.Pointer(&out[0]))
if pc, _, l, ok := runtime.Caller(allocFrames); ok {
a.allocs.Store(ptr, &dalloc{pc: pc, line: l, sz: size})
}
return out
}
func (a *CheckedAllocator) Reallocate(size int, b []byte) []byte {
atomic.AddInt64(&a.sz, int64(size-len(b)))
oldptr := uintptr(unsafe.Pointer(&b[0]))
out := a.mem.Reallocate(size, b)
if size == 0 {
return out
}
newptr := uintptr(unsafe.Pointer(&out[0]))
a.allocs.Delete(oldptr)
if pc, _, l, ok := runtime.Caller(reallocFrames); ok {
a.allocs.Store(newptr, &dalloc{pc: pc, line: l, sz: size})
}
return out
}
func (a *CheckedAllocator) Free(b []byte) {
atomic.AddInt64(&a.sz, int64(len(b)*-1))
defer a.mem.Free(b)
if len(b) == 0 {
return
}
ptr := uintptr(unsafe.Pointer(&b[0]))
a.allocs.Delete(ptr)
}
// typically the allocations are happening in memory.Buffer, not by consumers calling
// allocate/reallocate directly. As a result, we want to skip the caller frames
// of the inner workings of Buffer in order to find the caller that actually triggered
// the allocation via a call to Resize/Reserve/etc.
const (
defAllocFrames = 4
defReallocFrames = 3
)
// Use the environment variables ARROW_CHECKED_ALLOC_FRAMES and ARROW_CHECKED_REALLOC_FRAMES
// to control how many frames up it checks when storing the caller for allocations/reallocs
// when using this to find memory leaks.
var allocFrames, reallocFrames int = defAllocFrames, defReallocFrames
func init() {
if val, ok := os.LookupEnv("ARROW_CHECKED_ALLOC_FRAMES"); ok {
if f, err := strconv.Atoi(val); err == nil {
allocFrames = f
}
}
if val, ok := os.LookupEnv("ARROW_CHECKED_REALLOC_FRAMES"); ok {
if f, err := strconv.Atoi(val); err == nil {
reallocFrames = f
}
}
}
type dalloc struct {
pc uintptr
line int
sz int
}
type TestingT interface {
Errorf(format string, args ...interface{})
Helper()
}
func (a *CheckedAllocator) AssertSize(t TestingT, sz int) {
a.allocs.Range(func(_, value interface{}) bool {
info := value.(*dalloc)
f := runtime.FuncForPC(info.pc)
t.Errorf("LEAK of %d bytes FROM %s line %d\n", info.sz, f.Name(), info.line)
return true
})
if int(atomic.LoadInt64(&a.sz)) != sz {
t.Helper()
t.Errorf("invalid memory size exp=%d, got=%d", sz, a.sz)
}
}
type CheckedAllocatorScope struct {
alloc *CheckedAllocator
sz int
}
func NewCheckedAllocatorScope(alloc *CheckedAllocator) *CheckedAllocatorScope {
sz := atomic.LoadInt64(&alloc.sz)
return &CheckedAllocatorScope{alloc: alloc, sz: int(sz)}
}
func (c *CheckedAllocatorScope) CheckSize(t TestingT) {
sz := int(atomic.LoadInt64(&c.alloc.sz))
if c.sz != sz {
t.Helper()
t.Errorf("invalid memory size exp=%d, got=%d", c.sz, sz)
}
}
var (
_ Allocator = (*CheckedAllocator)(nil)
)