mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2025-11-03 23:22:25 -06:00
245 lines
7 KiB
Go
245 lines
7 KiB
Go
/**
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* Copyright 2023 ByteDance Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package loader
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import (
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`encoding`
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`encoding/binary`
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`fmt`
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`reflect`
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`strings`
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`sync`
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`unsafe`
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)
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const (
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_MinLC uint8 = 1
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_PtrSize uint8 = 8
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)
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const (
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_N_FUNCDATA = 8
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_INVALID_FUNCDATA_OFFSET = ^uint32(0)
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_FUNC_SIZE = unsafe.Sizeof(_func{})
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_MINFUNC = 16 // minimum size for a function
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_BUCKETSIZE = 256 * _MINFUNC
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_SUBBUCKETS = 16
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_SUB_BUCKETSIZE = _BUCKETSIZE / _SUBBUCKETS
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)
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// Note: This list must match the list in runtime/symtab.go.
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const (
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FuncFlag_TOPFRAME = 1 << iota
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FuncFlag_SPWRITE
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FuncFlag_ASM
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)
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// PCDATA and FUNCDATA table indexes.
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//
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// See funcdata.h and $GROOT/src/cmd/internal/objabi/funcdata.go.
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const (
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_FUNCDATA_ArgsPointerMaps = 0
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_FUNCDATA_LocalsPointerMaps = 1
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_FUNCDATA_StackObjects = 2
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_FUNCDATA_InlTree = 3
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_FUNCDATA_OpenCodedDeferInfo = 4
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_FUNCDATA_ArgInfo = 5
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_FUNCDATA_ArgLiveInfo = 6
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_FUNCDATA_WrapInfo = 7
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// ArgsSizeUnknown is set in Func.argsize to mark all functions
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// whose argument size is unknown (C vararg functions, and
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// assembly code without an explicit specification).
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// This value is generated by the compiler, assembler, or linker.
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ArgsSizeUnknown = -0x80000000
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)
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// moduledata used to cache the funcdata and findfuncbucket of one module
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var moduleCache = struct {
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m map[*moduledata][]byte
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sync.Mutex
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}{
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m: make(map[*moduledata][]byte),
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}
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// Func contains information about a function.
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type Func struct {
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ID uint8 // see runtime/symtab.go
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Flag uint8 // see runtime/symtab.go
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ArgsSize int32 // args byte size
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EntryOff uint32 // start pc, offset to moduledata.text
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TextSize uint32 // size of func text
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DeferReturn uint32 // offset of start of a deferreturn call instruction from entry, if any.
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FileIndex uint32 // index into filetab
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Name string // name of function
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// PC data
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Pcsp *Pcdata // PC -> SP delta
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Pcfile *Pcdata // PC -> file index
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Pcline *Pcdata // PC -> line number
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PcUnsafePoint *Pcdata // PC -> unsafe point, must be PCDATA_UnsafePointSafe or PCDATA_UnsafePointUnsafe
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PcStackMapIndex *Pcdata // PC -> stack map index, relative to ArgsPointerMaps and LocalsPointerMaps
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PcInlTreeIndex *Pcdata // PC -> inlining tree index, relative to InlTree
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PcArgLiveIndex *Pcdata // PC -> arg live index, relative to ArgLiveInfo
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// Func data, must implement encoding.BinaryMarshaler
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ArgsPointerMaps encoding.BinaryMarshaler // concrete type: *StackMap
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LocalsPointerMaps encoding.BinaryMarshaler // concrete type: *StackMap
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StackObjects encoding.BinaryMarshaler
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InlTree encoding.BinaryMarshaler
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OpenCodedDeferInfo encoding.BinaryMarshaler
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ArgInfo encoding.BinaryMarshaler
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ArgLiveInfo encoding.BinaryMarshaler
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WrapInfo encoding.BinaryMarshaler
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}
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func getOffsetOf(data interface{}, field string) uintptr {
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t := reflect.TypeOf(data)
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fv, ok := t.FieldByName(field)
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if !ok {
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panic(fmt.Sprintf("field %s not found in struct %s", field, t.Name()))
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}
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return fv.Offset
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}
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func rnd(v int64, r int64) int64 {
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if r <= 0 {
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return v
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}
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v += r - 1
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c := v % r
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if c < 0 {
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c += r
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}
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v -= c
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return v
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}
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var (
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byteOrder binary.ByteOrder = binary.LittleEndian
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)
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func funcNameParts(name string) (string, string, string) {
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i := strings.IndexByte(name, '[')
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if i < 0 {
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return name, "", ""
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}
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// TODO: use LastIndexByte once the bootstrap compiler is >= Go 1.5.
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j := len(name) - 1
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for j > i && name[j] != ']' {
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j--
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}
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if j <= i {
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return name, "", ""
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}
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return name[:i], "[...]", name[j+1:]
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}
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// func name table format:
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// nameOff[0] -> namePartA namePartB namePartC \x00
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// nameOff[1] -> namePartA namePartB namePartC \x00
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// ...
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func makeFuncnameTab(funcs []Func) (tab []byte, offs []int32) {
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offs = make([]int32, len(funcs))
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offset := 1
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tab = []byte{0}
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for i, f := range funcs {
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offs[i] = int32(offset)
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a, b, c := funcNameParts(f.Name)
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tab = append(tab, a...)
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tab = append(tab, b...)
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tab = append(tab, c...)
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tab = append(tab, 0)
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offset += len(a) + len(b) + len(c) + 1
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}
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return
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}
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// CU table format:
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// cuOffsets[0] -> filetabOffset[0] filetabOffset[1] ... filetabOffset[len(CUs[0].fileNames)-1]
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// cuOffsets[1] -> filetabOffset[len(CUs[0].fileNames)] ... filetabOffset[len(CUs[0].fileNames) + len(CUs[1].fileNames)-1]
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// ...
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//
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// file name table format:
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// filetabOffset[0] -> CUs[0].fileNames[0] \x00
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// ...
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// filetabOffset[len(CUs[0]-1)] -> CUs[0].fileNames[len(CUs[0].fileNames)-1] \x00
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// ...
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// filetabOffset[SUM(CUs,fileNames)-1] -> CUs[len(CU)-1].fileNames[len(CUs[len(CU)-1].fileNames)-1] \x00
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func makeFilenametab(cus []compilationUnit) (cutab []uint32, filetab []byte, cuOffsets []uint32) {
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cuOffsets = make([]uint32, len(cus))
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cuOffset := 0
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fileOffset := 0
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for i, cu := range cus {
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cuOffsets[i] = uint32(cuOffset)
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for _, name := range cu.fileNames {
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cutab = append(cutab, uint32(fileOffset))
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fileOffset += len(name) + 1
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filetab = append(filetab, name...)
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filetab = append(filetab, 0)
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}
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cuOffset += len(cu.fileNames)
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}
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return
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}
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func writeFuncdata(out *[]byte, funcs []Func) (fstart int, funcdataOffs [][]uint32) {
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fstart = len(*out)
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*out = append(*out, byte(0))
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offs := uint32(1)
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funcdataOffs = make([][]uint32, len(funcs))
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for i, f := range funcs {
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var writer = func(fd encoding.BinaryMarshaler) {
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var ab []byte
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var err error
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if fd != nil {
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ab, err = fd.MarshalBinary()
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if err != nil {
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panic(err)
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}
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funcdataOffs[i] = append(funcdataOffs[i], offs)
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} else {
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ab = []byte{0}
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funcdataOffs[i] = append(funcdataOffs[i], _INVALID_FUNCDATA_OFFSET)
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}
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*out = append(*out, ab...)
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offs += uint32(len(ab))
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}
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writer(f.ArgsPointerMaps)
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writer(f.LocalsPointerMaps)
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writer(f.StackObjects)
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writer(f.InlTree)
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writer(f.OpenCodedDeferInfo)
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writer(f.ArgInfo)
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writer(f.ArgLiveInfo)
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writer(f.WrapInfo)
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}
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return
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}
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