gotosocial/vendor/github.com/bytedance/sonic/loader/funcdata_latest.go
dependabot[bot] a5f28fe0c9
[chore]: Bump github.com/gin-contrib/gzip from 1.0.0 to 1.0.1 (#2899)
Bumps [github.com/gin-contrib/gzip](https://github.com/gin-contrib/gzip) from 1.0.0 to 1.0.1.
- [Release notes](https://github.com/gin-contrib/gzip/releases)
- [Changelog](https://github.com/gin-contrib/gzip/blob/master/.goreleaser.yaml)
- [Commits](https://github.com/gin-contrib/gzip/compare/v1.0.0...v1.0.1)

---
updated-dependencies:
- dependency-name: github.com/gin-contrib/gzip
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
2024-05-06 08:50:47 +00:00

356 lines
12 KiB
Go

// go:build go1.18 && !go1.23
// +build go1.18,!go1.23
/*
* Copyright 2021 ByteDance Inc.
*
* 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.
*/
package loader
import (
`os`
`sort`
`unsafe`
`github.com/bytedance/sonic/loader/internal/rt`
)
type funcTab struct {
entry uint32
funcoff uint32
}
type pcHeader struct {
magic uint32 // 0xFFFFFFF0
pad1, pad2 uint8 // 0,0
minLC uint8 // min instruction size
ptrSize uint8 // size of a ptr in bytes
nfunc int // number of functions in the module
nfiles uint // number of entries in the file tab
textStart uintptr // base for function entry PC offsets in this module, equal to moduledata.text
funcnameOffset uintptr // offset to the funcnametab variable from pcHeader
cuOffset uintptr // offset to the cutab variable from pcHeader
filetabOffset uintptr // offset to the filetab variable from pcHeader
pctabOffset uintptr // offset to the pctab variable from pcHeader
pclnOffset uintptr // offset to the pclntab variable from pcHeader
}
type bitVector struct {
n int32 // # of bits
bytedata *uint8
}
type ptabEntry struct {
name int32
typ int32
}
type textSection struct {
vaddr uintptr // prelinked section vaddr
end uintptr // vaddr + section length
baseaddr uintptr // relocated section address
}
type modulehash struct {
modulename string
linktimehash string
runtimehash *string
}
// findfuncbucket is an array of these structures.
// Each bucket represents 4096 bytes of the text segment.
// Each subbucket represents 256 bytes of the text segment.
// To find a function given a pc, locate the bucket and subbucket for
// that pc. Add together the idx and subbucket value to obtain a
// function index. Then scan the functab array starting at that
// index to find the target function.
// This table uses 20 bytes for every 4096 bytes of code, or ~0.5% overhead.
type findfuncbucket struct {
idx uint32
_SUBBUCKETS [16]byte
}
type compilationUnit struct {
fileNames []string
}
func makeFtab(funcs []_func, maxpc uint32) (ftab []funcTab, pclntabSize int64, startLocations []uint32) {
// Allocate space for the pc->func table. This structure consists of a pc offset
// and an offset to the func structure. After that, we have a single pc
// value that marks the end of the last function in the binary.
pclntabSize = int64(len(funcs)*2*int(_PtrSize) + int(_PtrSize))
startLocations = make([]uint32, len(funcs))
for i, f := range funcs {
pclntabSize = rnd(pclntabSize, int64(_PtrSize))
//writePCToFunc
startLocations[i] = uint32(pclntabSize)
pclntabSize += int64(uint8(_FUNC_SIZE)+f.nfuncdata*4+uint8(f.npcdata)*4)
}
ftab = make([]funcTab, 0, len(funcs)+1)
// write a map of pc->func info offsets
for i, f := range funcs {
ftab = append(ftab, funcTab{uint32(f.entryOff), uint32(startLocations[i])})
}
// Final entry of table is just end pc offset.
ftab = append(ftab, funcTab{maxpc, 0})
return
}
// Pcln table format: [...]funcTab + [...]_Func
func makePclntable(size int64, startLocations []uint32, funcs []_func, maxpc uint32, pcdataOffs [][]uint32, funcdataOffs [][]uint32) (pclntab []byte) {
// Allocate space for the pc->func table. This structure consists of a pc offset
// and an offset to the func structure. After that, we have a single pc
// value that marks the end of the last function in the binary.
pclntab = make([]byte, size, size)
// write a map of pc->func info offsets
offs := 0
for i, f := range funcs {
byteOrder.PutUint32(pclntab[offs:offs+4], uint32(f.entryOff))
byteOrder.PutUint32(pclntab[offs+4:offs+8], uint32(startLocations[i]))
offs += 8
}
// Final entry of table is just end pc offset.
byteOrder.PutUint32(pclntab[offs:offs+4], maxpc)
// write func info table
for i := range funcs {
off := startLocations[i]
// write _func structure to pclntab
fb := rt.BytesFrom(unsafe.Pointer(&funcs[i]), int(_FUNC_SIZE), int(_FUNC_SIZE))
copy(pclntab[off:off+uint32(_FUNC_SIZE)], fb)
off += uint32(_FUNC_SIZE)
// NOTICE: _func.pcdata always starts from PcUnsafePoint, which is index 3
for j := 3; j < len(pcdataOffs[i]); j++ {
byteOrder.PutUint32(pclntab[off:off+4], uint32(pcdataOffs[i][j]))
off += 4
}
// funcdata refs as offsets from gofunc
for _, funcdata := range funcdataOffs[i] {
byteOrder.PutUint32(pclntab[off:off+4], uint32(funcdata))
off += 4
}
}
return
}
// findfunc table used to map pc to belonging func,
// returns the index in the func table.
//
// All text section are divided into buckets sized _BUCKETSIZE(4K):
// every bucket is divided into _SUBBUCKETS sized _SUB_BUCKETSIZE(64),
// and it has a base idx to plus the offset stored in jth subbucket.
// see findfunc() in runtime/symtab.go
func writeFindfunctab(out *[]byte, ftab []funcTab) (start int) {
start = len(*out)
max := ftab[len(ftab)-1].entry
min := ftab[0].entry
nbuckets := (max - min + _BUCKETSIZE - 1) / _BUCKETSIZE
n := (max - min + _SUB_BUCKETSIZE - 1) / _SUB_BUCKETSIZE
tab := make([]findfuncbucket, 0, nbuckets)
var s, e = 0, 0
for i := 0; i<int(nbuckets); i++ {
// store the start s-th func of the bucket
var fb = findfuncbucket{idx: uint32(s)}
// find the last e-th func of the bucket
var pc = min + uint32((i+1)*_BUCKETSIZE)
for ; e < len(ftab)-1 && ftab[e+1].entry <= pc; e++ {}
for j := 0; j<_SUBBUCKETS && (i*_SUBBUCKETS+j)<int(n); j++ {
// store the start func of the subbucket
fb._SUBBUCKETS[j] = byte(uint32(s) - fb.idx)
// find the s-th end func of the subbucket
pc = min + uint32(i*_BUCKETSIZE) + uint32((j+1)*_SUB_BUCKETSIZE)
for ; s < len(ftab)-1 && ftab[s+1].entry <= pc; s++ {}
}
s = e
tab = append(tab, fb)
}
// write findfuncbucket
if len(tab) > 0 {
size := int(unsafe.Sizeof(findfuncbucket{}))*len(tab)
*out = append(*out, rt.BytesFrom(unsafe.Pointer(&tab[0]), size, size)...)
}
return
}
func makeModuledata(name string, filenames []string, funcsp *[]Func, text []byte) (mod *moduledata) {
mod = new(moduledata)
mod.modulename = name
// sort funcs by entry
funcs := *funcsp
sort.Slice(funcs, func(i, j int) bool {
return funcs[i].EntryOff < funcs[j].EntryOff
})
*funcsp = funcs
// make filename table
cu := make([]string, 0, len(filenames))
cu = append(cu, filenames...)
cutab, filetab, cuOffs := makeFilenametab([]compilationUnit{{cu}})
mod.cutab = cutab
mod.filetab = filetab
// make funcname table
funcnametab, nameOffs := makeFuncnameTab(funcs)
mod.funcnametab = funcnametab
// mmap() text and funcdata segements
p := os.Getpagesize()
size := int(rnd(int64(len(text)), int64(p)))
addr := mmap(size)
// copy the machine code
s := rt.BytesFrom(unsafe.Pointer(addr), len(text), size)
copy(s, text)
// make it executable
mprotect(addr, size)
// assign addresses
mod.text = addr
mod.etext = addr + uintptr(size)
mod.minpc = addr
mod.maxpc = addr + uintptr(len(text))
// make pcdata table
// NOTICE: _func only use offset to index pcdata, thus no need mmap() pcdata
cuOff := cuOffs[0]
pctab, pcdataOffs, _funcs := makePctab(funcs, cuOff, nameOffs)
mod.pctab = pctab
// write func data
// NOTICE: _func use mod.gofunc+offset to directly point funcdata, thus need cache funcdata
// TODO: estimate accurate capacity
cache := make([]byte, 0, len(funcs)*int(_PtrSize))
fstart, funcdataOffs := writeFuncdata(&cache, funcs)
// make pc->func (binary search) func table
ftab, pclntSize, startLocations := makeFtab(_funcs, uint32(len(text)))
mod.ftab = ftab
// write pc->func (modmap) findfunc table
ffstart := writeFindfunctab(&cache, ftab)
// cache funcdata and findfuncbucket
moduleCache.Lock()
moduleCache.m[mod] = cache
moduleCache.Unlock()
mod.gofunc = uintptr(unsafe.Pointer(&cache[fstart]))
mod.findfunctab = uintptr(unsafe.Pointer(&cache[ffstart]))
// make pclnt table
pclntab := makePclntable(pclntSize, startLocations, _funcs, uint32(len(text)), pcdataOffs, funcdataOffs)
mod.pclntable = pclntab
// make pc header
mod.pcHeader = &pcHeader {
magic : _Magic,
minLC : _MinLC,
ptrSize : _PtrSize,
nfunc : len(funcs),
nfiles: uint(len(cu)),
textStart: mod.text,
funcnameOffset: getOffsetOf(moduledata{}, "funcnametab"),
cuOffset: getOffsetOf(moduledata{}, "cutab"),
filetabOffset: getOffsetOf(moduledata{}, "filetab"),
pctabOffset: getOffsetOf(moduledata{}, "pctab"),
pclnOffset: getOffsetOf(moduledata{}, "pclntable"),
}
// sepecial case: gcdata and gcbss must by non-empty
mod.gcdata = uintptr(unsafe.Pointer(&emptyByte))
mod.gcbss = uintptr(unsafe.Pointer(&emptyByte))
return
}
// makePctab generates pcdelta->valuedelta tables for functions,
// and returns the table and the entry offset of every kind pcdata in the table.
func makePctab(funcs []Func, cuOffset uint32, nameOffset []int32) (pctab []byte, pcdataOffs [][]uint32, _funcs []_func) {
_funcs = make([]_func, len(funcs))
// Pctab offsets of 0 are considered invalid in the runtime. We respect
// that by just padding a single byte at the beginning of runtime.pctab,
// that way no real offsets can be zero.
pctab = make([]byte, 1, 12*len(funcs)+1)
pcdataOffs = make([][]uint32, len(funcs))
for i, f := range funcs {
_f := &_funcs[i]
var writer = func(pc *Pcdata) {
var ab []byte
var err error
if pc != nil {
ab, err = pc.MarshalBinary()
if err != nil {
panic(err)
}
pcdataOffs[i] = append(pcdataOffs[i], uint32(len(pctab)))
} else {
ab = []byte{0}
pcdataOffs[i] = append(pcdataOffs[i], _PCDATA_INVALID_OFFSET)
}
pctab = append(pctab, ab...)
}
if f.Pcsp != nil {
_f.pcsp = uint32(len(pctab))
}
writer(f.Pcsp)
if f.Pcfile != nil {
_f.pcfile = uint32(len(pctab))
}
writer(f.Pcfile)
if f.Pcline != nil {
_f.pcln = uint32(len(pctab))
}
writer(f.Pcline)
writer(f.PcUnsafePoint)
writer(f.PcStackMapIndex)
writer(f.PcInlTreeIndex)
writer(f.PcArgLiveIndex)
_f.entryOff = f.EntryOff
_f.nameOff = nameOffset[i]
_f.args = f.ArgsSize
_f.deferreturn = f.DeferReturn
// NOTICE: _func.pcdata is always as [PCDATA_UnsafePoint(0) : PCDATA_ArgLiveIndex(3)]
_f.npcdata = uint32(_N_PCDATA)
_f.cuOffset = cuOffset
_f.funcID = f.ID
_f.flag = f.Flag
_f.nfuncdata = uint8(_N_FUNCDATA)
}
return
}
func registerFunction(name string, pc uintptr, textSize uintptr, fp int, args int, size uintptr, argptrs uintptr, localptrs uintptr) {}