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feat: support gc root mask to avoid dwarf search missing memory (#26)
* feat: support stackmap and gcbss/datamask to avoid dwarf search missing memory * feat: use conservative scanning * feat: adjust log level
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// Copyright 2024 CloudWeGo Authors | ||
// | ||
// Licensed 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. | ||
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package proc | ||
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import ( | ||
"errors" | ||
"math/bits" | ||
) | ||
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type gcMaskBitIterator struct { | ||
base, end Address // cannot reach end | ||
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maskBase Address | ||
mask []uint64 | ||
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addr Address // iterator address | ||
} | ||
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// nextPtr returns next ptr address starts from 'addr', returns 0 if not found. | ||
// If ack == true, the 'addr' will automatically increment to the next | ||
// starting address to be searched. | ||
func (b *gcMaskBitIterator) nextPtr(ack bool) Address { | ||
if b == nil { | ||
return 0 | ||
} | ||
startOffset, endOffset := b.addr.Sub(b.maskBase), b.end.Sub(b.maskBase) | ||
if startOffset >= endOffset || startOffset < 0 { | ||
return 0 | ||
} | ||
for startOffset < endOffset { | ||
ptrIdx := startOffset / 8 / 64 | ||
i := startOffset / 8 % 64 | ||
j := int64(bits.TrailingZeros64(b.mask[ptrIdx] >> i)) | ||
if j == 64 { | ||
// search the next ptr | ||
startOffset = (ptrIdx + 1) * 64 * 8 | ||
continue | ||
} | ||
addr := b.maskBase.Add(startOffset + j*8) | ||
if addr >= b.end { | ||
return 0 | ||
} | ||
if ack { | ||
b.addr = addr.Add(8) | ||
} | ||
return addr | ||
} | ||
return 0 | ||
} | ||
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// resetGCMask will reset ptrMask corresponding to the address, | ||
// which will never be marked again by the finalMark. | ||
func (b *gcMaskBitIterator) resetGCMask(addr Address) error { | ||
if b == nil { | ||
return nil | ||
} | ||
if addr < b.base || addr >= b.end { | ||
return errOutOfRange | ||
} | ||
// TODO: check gc mask | ||
offset := addr.Sub(b.maskBase) | ||
b.mask[offset/8/64] &= ^(1 << (offset / 8 % 64)) | ||
return nil | ||
} | ||
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func newGCBitsIterator(base, end, maskBase Address, ptrMask []uint64) *gcMaskBitIterator { | ||
return &gcMaskBitIterator{base: base, end: end, mask: ptrMask, addr: base, maskBase: maskBase} | ||
} | ||
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// To avoid traversing fields/elements that escape the actual valid scope. | ||
// e.g. (*[1 << 16]scase)(unsafe.Pointer(cas0)) in runtime.selectgo. | ||
var errOutOfRange = errors.New("out of heap span range") |
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