mirror of
https://github.com/superseriousbusiness/gotosocial
synced 2025-06-05 21:59:39 +02:00
[chore] Update gin to v1.9.0 (#1553)
This commit is contained in:
Daenney
GitHub
871
vendor/github.com/twitchyliquid64/golang-asm/goobj/objfile.go
generated
vendored
Normal file
871
vendor/github.com/twitchyliquid64/golang-asm/goobj/objfile.go
generated
vendored
Normal file
@ -0,0 +1,871 @@
|
||||
// Copyright 2019 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// This package defines the Go object file format, and provide "low-level" functions
|
||||
// for reading and writing object files.
|
||||
|
||||
// The object file is understood by the compiler, assembler, linker, and tools. They
|
||||
// have "high level" code that operates on object files, handling application-specific
|
||||
// logics, and use this package for the actual reading and writing. Specifically, the
|
||||
// code below:
|
||||
//
|
||||
// - cmd/internal/obj/objfile.go (used by cmd/asm and cmd/compile)
|
||||
// - cmd/internal/objfile/goobj.go (used cmd/nm, cmd/objdump)
|
||||
// - cmd/link/internal/loader package (used by cmd/link)
|
||||
//
|
||||
// If the object file format changes, they may (or may not) need to change.
|
||||
|
||||
package goobj
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"github.com/twitchyliquid64/golang-asm/bio"
|
||||
"crypto/sha1"
|
||||
"encoding/binary"
|
||||
"errors"
|
||||
"fmt"
|
||||
"github.com/twitchyliquid64/golang-asm/unsafeheader"
|
||||
"io"
|
||||
"unsafe"
|
||||
)
|
||||
|
||||
// New object file format.
|
||||
//
|
||||
// Header struct {
|
||||
// Magic [...]byte // "\x00go116ld"
|
||||
// Fingerprint [8]byte
|
||||
// Flags uint32
|
||||
// Offsets [...]uint32 // byte offset of each block below
|
||||
// }
|
||||
//
|
||||
// Strings [...]struct {
|
||||
// Data [...]byte
|
||||
// }
|
||||
//
|
||||
// Autolib [...]struct { // imported packages (for file loading)
|
||||
// Pkg string
|
||||
// Fingerprint [8]byte
|
||||
// }
|
||||
//
|
||||
// PkgIndex [...]string // referenced packages by index
|
||||
//
|
||||
// Files [...]string
|
||||
//
|
||||
// SymbolDefs [...]struct {
|
||||
// Name string
|
||||
// ABI uint16
|
||||
// Type uint8
|
||||
// Flag uint8
|
||||
// Flag2 uint8
|
||||
// Size uint32
|
||||
// }
|
||||
// Hashed64Defs [...]struct { // short hashed (content-addressable) symbol definitions
|
||||
// ... // same as SymbolDefs
|
||||
// }
|
||||
// HashedDefs [...]struct { // hashed (content-addressable) symbol definitions
|
||||
// ... // same as SymbolDefs
|
||||
// }
|
||||
// NonPkgDefs [...]struct { // non-pkg symbol definitions
|
||||
// ... // same as SymbolDefs
|
||||
// }
|
||||
// NonPkgRefs [...]struct { // non-pkg symbol references
|
||||
// ... // same as SymbolDefs
|
||||
// }
|
||||
//
|
||||
// RefFlags [...]struct { // referenced symbol flags
|
||||
// Sym symRef
|
||||
// Flag uint8
|
||||
// Flag2 uint8
|
||||
// }
|
||||
//
|
||||
// Hash64 [...][8]byte
|
||||
// Hash [...][N]byte
|
||||
//
|
||||
// RelocIndex [...]uint32 // index to Relocs
|
||||
// AuxIndex [...]uint32 // index to Aux
|
||||
// DataIndex [...]uint32 // offset to Data
|
||||
//
|
||||
// Relocs [...]struct {
|
||||
// Off int32
|
||||
// Size uint8
|
||||
// Type uint8
|
||||
// Add int64
|
||||
// Sym symRef
|
||||
// }
|
||||
//
|
||||
// Aux [...]struct {
|
||||
// Type uint8
|
||||
// Sym symRef
|
||||
// }
|
||||
//
|
||||
// Data [...]byte
|
||||
// Pcdata [...]byte
|
||||
//
|
||||
// // blocks only used by tools (objdump, nm)
|
||||
//
|
||||
// RefNames [...]struct { // referenced symbol names
|
||||
// Sym symRef
|
||||
// Name string
|
||||
// // TODO: include ABI version as well?
|
||||
// }
|
||||
//
|
||||
// string is encoded as is a uint32 length followed by a uint32 offset
|
||||
// that points to the corresponding string bytes.
|
||||
//
|
||||
// symRef is struct { PkgIdx, SymIdx uint32 }.
|
||||
//
|
||||
// Slice type (e.g. []symRef) is encoded as a length prefix (uint32)
|
||||
// followed by that number of elements.
|
||||
//
|
||||
// The types below correspond to the encoded data structure in the
|
||||
// object file.
|
||||
|
||||
// Symbol indexing.
|
||||
//
|
||||
// Each symbol is referenced with a pair of indices, { PkgIdx, SymIdx },
|
||||
// as the symRef struct above.
|
||||
//
|
||||
// PkgIdx is either a predeclared index (see PkgIdxNone below) or
|
||||
// an index of an imported package. For the latter case, PkgIdx is the
|
||||
// index of the package in the PkgIndex array. 0 is an invalid index.
|
||||
//
|
||||
// SymIdx is the index of the symbol in the given package.
|
||||
// - If PkgIdx is PkgIdxSelf, SymIdx is the index of the symbol in the
|
||||
// SymbolDefs array.
|
||||
// - If PkgIdx is PkgIdxHashed64, SymIdx is the index of the symbol in the
|
||||
// Hashed64Defs array.
|
||||
// - If PkgIdx is PkgIdxHashed, SymIdx is the index of the symbol in the
|
||||
// HashedDefs array.
|
||||
// - If PkgIdx is PkgIdxNone, SymIdx is the index of the symbol in the
|
||||
// NonPkgDefs array (could natually overflow to NonPkgRefs array).
|
||||
// - Otherwise, SymIdx is the index of the symbol in some other package's
|
||||
// SymbolDefs array.
|
||||
//
|
||||
// {0, 0} represents a nil symbol. Otherwise PkgIdx should not be 0.
|
||||
//
|
||||
// Hash contains the content hashes of content-addressable symbols, of
|
||||
// which PkgIdx is PkgIdxHashed, in the same order of HashedDefs array.
|
||||
// Hash64 is similar, for PkgIdxHashed64 symbols.
|
||||
//
|
||||
// RelocIndex, AuxIndex, and DataIndex contains indices/offsets to
|
||||
// Relocs/Aux/Data blocks, one element per symbol, first for all the
|
||||
// defined symbols, then all the defined hashed and non-package symbols,
|
||||
// in the same order of SymbolDefs/Hashed64Defs/HashedDefs/NonPkgDefs
|
||||
// arrays. For N total defined symbols, the array is of length N+1. The
|
||||
// last element is the total number of relocations (aux symbols, data
|
||||
// blocks, etc.).
|
||||
//
|
||||
// They can be accessed by index. For the i-th symbol, its relocations
|
||||
// are the RelocIndex[i]-th (inclusive) to RelocIndex[i+1]-th (exclusive)
|
||||
// elements in the Relocs array. Aux/Data are likewise. (The index is
|
||||
// 0-based.)
|
||||
|
||||
// Auxiliary symbols.
|
||||
//
|
||||
// Each symbol may (or may not) be associated with a number of auxiliary
|
||||
// symbols. They are described in the Aux block. See Aux struct below.
|
||||
// Currently a symbol's Gotype, FuncInfo, and associated DWARF symbols
|
||||
// are auxiliary symbols.
|
||||
|
||||
const stringRefSize = 8 // two uint32s
|
||||
|
||||
type FingerprintType [8]byte
|
||||
|
||||
func (fp FingerprintType) IsZero() bool { return fp == FingerprintType{} }
|
||||
|
||||
// Package Index.
|
||||
const (
|
||||
PkgIdxNone = (1<<31 - 1) - iota // Non-package symbols
|
||||
PkgIdxHashed64 // Short hashed (content-addressable) symbols
|
||||
PkgIdxHashed // Hashed (content-addressable) symbols
|
||||
PkgIdxBuiltin // Predefined runtime symbols (ex: runtime.newobject)
|
||||
PkgIdxSelf // Symbols defined in the current package
|
||||
PkgIdxInvalid = 0
|
||||
// The index of other referenced packages starts from 1.
|
||||
)
|
||||
|
||||
// Blocks
|
||||
const (
|
||||
BlkAutolib = iota
|
||||
BlkPkgIdx
|
||||
BlkFile
|
||||
BlkSymdef
|
||||
BlkHashed64def
|
||||
BlkHasheddef
|
||||
BlkNonpkgdef
|
||||
BlkNonpkgref
|
||||
BlkRefFlags
|
||||
BlkHash64
|
||||
BlkHash
|
||||
BlkRelocIdx
|
||||
BlkAuxIdx
|
||||
BlkDataIdx
|
||||
BlkReloc
|
||||
BlkAux
|
||||
BlkData
|
||||
BlkPcdata
|
||||
BlkRefName
|
||||
BlkEnd
|
||||
NBlk
|
||||
)
|
||||
|
||||
// File header.
|
||||
// TODO: probably no need to export this.
|
||||
type Header struct {
|
||||
Magic string
|
||||
Fingerprint FingerprintType
|
||||
Flags uint32
|
||||
Offsets [NBlk]uint32
|
||||
}
|
||||
|
||||
const Magic = "\x00go116ld"
|
||||
|
||||
func (h *Header) Write(w *Writer) {
|
||||
w.RawString(h.Magic)
|
||||
w.Bytes(h.Fingerprint[:])
|
||||
w.Uint32(h.Flags)
|
||||
for _, x := range h.Offsets {
|
||||
w.Uint32(x)
|
||||
}
|
||||
}
|
||||
|
||||
func (h *Header) Read(r *Reader) error {
|
||||
b := r.BytesAt(0, len(Magic))
|
||||
h.Magic = string(b)
|
||||
if h.Magic != Magic {
|
||||
return errors.New("wrong magic, not a Go object file")
|
||||
}
|
||||
off := uint32(len(h.Magic))
|
||||
copy(h.Fingerprint[:], r.BytesAt(off, len(h.Fingerprint)))
|
||||
off += 8
|
||||
h.Flags = r.uint32At(off)
|
||||
off += 4
|
||||
for i := range h.Offsets {
|
||||
h.Offsets[i] = r.uint32At(off)
|
||||
off += 4
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (h *Header) Size() int {
|
||||
return len(h.Magic) + 4 + 4*len(h.Offsets)
|
||||
}
|
||||
|
||||
// Autolib
|
||||
type ImportedPkg struct {
|
||||
Pkg string
|
||||
Fingerprint FingerprintType
|
||||
}
|
||||
|
||||
const importedPkgSize = stringRefSize + 8
|
||||
|
||||
func (p *ImportedPkg) Write(w *Writer) {
|
||||
w.StringRef(p.Pkg)
|
||||
w.Bytes(p.Fingerprint[:])
|
||||
}
|
||||
|
||||
// Symbol definition.
|
||||
//
|
||||
// Serialized format:
|
||||
// Sym struct {
|
||||
// Name string
|
||||
// ABI uint16
|
||||
// Type uint8
|
||||
// Flag uint8
|
||||
// Flag2 uint8
|
||||
// Siz uint32
|
||||
// Align uint32
|
||||
// }
|
||||
type Sym [SymSize]byte
|
||||
|
||||
const SymSize = stringRefSize + 2 + 1 + 1 + 1 + 4 + 4
|
||||
|
||||
const SymABIstatic = ^uint16(0)
|
||||
|
||||
const (
|
||||
ObjFlagShared = 1 << iota // this object is built with -shared
|
||||
ObjFlagNeedNameExpansion // the linker needs to expand `"".` to package path in symbol names
|
||||
ObjFlagFromAssembly // object is from asm src, not go
|
||||
)
|
||||
|
||||
// Sym.Flag
|
||||
const (
|
||||
SymFlagDupok = 1 << iota
|
||||
SymFlagLocal
|
||||
SymFlagTypelink
|
||||
SymFlagLeaf
|
||||
SymFlagNoSplit
|
||||
SymFlagReflectMethod
|
||||
SymFlagGoType
|
||||
SymFlagTopFrame
|
||||
)
|
||||
|
||||
// Sym.Flag2
|
||||
const (
|
||||
SymFlagUsedInIface = 1 << iota
|
||||
SymFlagItab
|
||||
)
|
||||
|
||||
// Returns the length of the name of the symbol.
|
||||
func (s *Sym) NameLen(r *Reader) int {
|
||||
return int(binary.LittleEndian.Uint32(s[:]))
|
||||
}
|
||||
|
||||
func (s *Sym) Name(r *Reader) string {
|
||||
len := binary.LittleEndian.Uint32(s[:])
|
||||
off := binary.LittleEndian.Uint32(s[4:])
|
||||
return r.StringAt(off, len)
|
||||
}
|
||||
|
||||
func (s *Sym) ABI() uint16 { return binary.LittleEndian.Uint16(s[8:]) }
|
||||
func (s *Sym) Type() uint8 { return s[10] }
|
||||
func (s *Sym) Flag() uint8 { return s[11] }
|
||||
func (s *Sym) Flag2() uint8 { return s[12] }
|
||||
func (s *Sym) Siz() uint32 { return binary.LittleEndian.Uint32(s[13:]) }
|
||||
func (s *Sym) Align() uint32 { return binary.LittleEndian.Uint32(s[17:]) }
|
||||
|
||||
func (s *Sym) Dupok() bool { return s.Flag()&SymFlagDupok != 0 }
|
||||
func (s *Sym) Local() bool { return s.Flag()&SymFlagLocal != 0 }
|
||||
func (s *Sym) Typelink() bool { return s.Flag()&SymFlagTypelink != 0 }
|
||||
func (s *Sym) Leaf() bool { return s.Flag()&SymFlagLeaf != 0 }
|
||||
func (s *Sym) NoSplit() bool { return s.Flag()&SymFlagNoSplit != 0 }
|
||||
func (s *Sym) ReflectMethod() bool { return s.Flag()&SymFlagReflectMethod != 0 }
|
||||
func (s *Sym) IsGoType() bool { return s.Flag()&SymFlagGoType != 0 }
|
||||
func (s *Sym) TopFrame() bool { return s.Flag()&SymFlagTopFrame != 0 }
|
||||
func (s *Sym) UsedInIface() bool { return s.Flag2()&SymFlagUsedInIface != 0 }
|
||||
func (s *Sym) IsItab() bool { return s.Flag2()&SymFlagItab != 0 }
|
||||
|
||||
func (s *Sym) SetName(x string, w *Writer) {
|
||||
binary.LittleEndian.PutUint32(s[:], uint32(len(x)))
|
||||
binary.LittleEndian.PutUint32(s[4:], w.stringOff(x))
|
||||
}
|
||||
|
||||
func (s *Sym) SetABI(x uint16) { binary.LittleEndian.PutUint16(s[8:], x) }
|
||||
func (s *Sym) SetType(x uint8) { s[10] = x }
|
||||
func (s *Sym) SetFlag(x uint8) { s[11] = x }
|
||||
func (s *Sym) SetFlag2(x uint8) { s[12] = x }
|
||||
func (s *Sym) SetSiz(x uint32) { binary.LittleEndian.PutUint32(s[13:], x) }
|
||||
func (s *Sym) SetAlign(x uint32) { binary.LittleEndian.PutUint32(s[17:], x) }
|
||||
|
||||
func (s *Sym) Write(w *Writer) { w.Bytes(s[:]) }
|
||||
|
||||
// for testing
|
||||
func (s *Sym) fromBytes(b []byte) { copy(s[:], b) }
|
||||
|
||||
// Symbol reference.
|
||||
type SymRef struct {
|
||||
PkgIdx uint32
|
||||
SymIdx uint32
|
||||
}
|
||||
|
||||
// Hash64
|
||||
type Hash64Type [Hash64Size]byte
|
||||
|
||||
const Hash64Size = 8
|
||||
|
||||
// Hash
|
||||
type HashType [HashSize]byte
|
||||
|
||||
const HashSize = sha1.Size
|
||||
|
||||
// Relocation.
|
||||
//
|
||||
// Serialized format:
|
||||
// Reloc struct {
|
||||
// Off int32
|
||||
// Siz uint8
|
||||
// Type uint8
|
||||
// Add int64
|
||||
// Sym SymRef
|
||||
// }
|
||||
type Reloc [RelocSize]byte
|
||||
|
||||
const RelocSize = 4 + 1 + 1 + 8 + 8
|
||||
|
||||
func (r *Reloc) Off() int32 { return int32(binary.LittleEndian.Uint32(r[:])) }
|
||||
func (r *Reloc) Siz() uint8 { return r[4] }
|
||||
func (r *Reloc) Type() uint8 { return r[5] }
|
||||
func (r *Reloc) Add() int64 { return int64(binary.LittleEndian.Uint64(r[6:])) }
|
||||
func (r *Reloc) Sym() SymRef {
|
||||
return SymRef{binary.LittleEndian.Uint32(r[14:]), binary.LittleEndian.Uint32(r[18:])}
|
||||
}
|
||||
|
||||
func (r *Reloc) SetOff(x int32) { binary.LittleEndian.PutUint32(r[:], uint32(x)) }
|
||||
func (r *Reloc) SetSiz(x uint8) { r[4] = x }
|
||||
func (r *Reloc) SetType(x uint8) { r[5] = x }
|
||||
func (r *Reloc) SetAdd(x int64) { binary.LittleEndian.PutUint64(r[6:], uint64(x)) }
|
||||
func (r *Reloc) SetSym(x SymRef) {
|
||||
binary.LittleEndian.PutUint32(r[14:], x.PkgIdx)
|
||||
binary.LittleEndian.PutUint32(r[18:], x.SymIdx)
|
||||
}
|
||||
|
||||
func (r *Reloc) Set(off int32, size uint8, typ uint8, add int64, sym SymRef) {
|
||||
r.SetOff(off)
|
||||
r.SetSiz(size)
|
||||
r.SetType(typ)
|
||||
r.SetAdd(add)
|
||||
r.SetSym(sym)
|
||||
}
|
||||
|
||||
func (r *Reloc) Write(w *Writer) { w.Bytes(r[:]) }
|
||||
|
||||
// for testing
|
||||
func (r *Reloc) fromBytes(b []byte) { copy(r[:], b) }
|
||||
|
||||
// Aux symbol info.
|
||||
//
|
||||
// Serialized format:
|
||||
// Aux struct {
|
||||
// Type uint8
|
||||
// Sym SymRef
|
||||
// }
|
||||
type Aux [AuxSize]byte
|
||||
|
||||
const AuxSize = 1 + 8
|
||||
|
||||
// Aux Type
|
||||
const (
|
||||
AuxGotype = iota
|
||||
AuxFuncInfo
|
||||
AuxFuncdata
|
||||
AuxDwarfInfo
|
||||
AuxDwarfLoc
|
||||
AuxDwarfRanges
|
||||
AuxDwarfLines
|
||||
|
||||
// TODO: more. Pcdata?
|
||||
)
|
||||
|
||||
func (a *Aux) Type() uint8 { return a[0] }
|
||||
func (a *Aux) Sym() SymRef {
|
||||
return SymRef{binary.LittleEndian.Uint32(a[1:]), binary.LittleEndian.Uint32(a[5:])}
|
||||
}
|
||||
|
||||
func (a *Aux) SetType(x uint8) { a[0] = x }
|
||||
func (a *Aux) SetSym(x SymRef) {
|
||||
binary.LittleEndian.PutUint32(a[1:], x.PkgIdx)
|
||||
binary.LittleEndian.PutUint32(a[5:], x.SymIdx)
|
||||
}
|
||||
|
||||
func (a *Aux) Write(w *Writer) { w.Bytes(a[:]) }
|
||||
|
||||
// for testing
|
||||
func (a *Aux) fromBytes(b []byte) { copy(a[:], b) }
|
||||
|
||||
// Referenced symbol flags.
|
||||
//
|
||||
// Serialized format:
|
||||
// RefFlags struct {
|
||||
// Sym symRef
|
||||
// Flag uint8
|
||||
// Flag2 uint8
|
||||
// }
|
||||
type RefFlags [RefFlagsSize]byte
|
||||
|
||||
const RefFlagsSize = 8 + 1 + 1
|
||||
|
||||
func (r *RefFlags) Sym() SymRef {
|
||||
return SymRef{binary.LittleEndian.Uint32(r[:]), binary.LittleEndian.Uint32(r[4:])}
|
||||
}
|
||||
func (r *RefFlags) Flag() uint8 { return r[8] }
|
||||
func (r *RefFlags) Flag2() uint8 { return r[9] }
|
||||
|
||||
func (r *RefFlags) SetSym(x SymRef) {
|
||||
binary.LittleEndian.PutUint32(r[:], x.PkgIdx)
|
||||
binary.LittleEndian.PutUint32(r[4:], x.SymIdx)
|
||||
}
|
||||
func (r *RefFlags) SetFlag(x uint8) { r[8] = x }
|
||||
func (r *RefFlags) SetFlag2(x uint8) { r[9] = x }
|
||||
|
||||
func (r *RefFlags) Write(w *Writer) { w.Bytes(r[:]) }
|
||||
|
||||
// Referenced symbol name.
|
||||
//
|
||||
// Serialized format:
|
||||
// RefName struct {
|
||||
// Sym symRef
|
||||
// Name string
|
||||
// }
|
||||
type RefName [RefNameSize]byte
|
||||
|
||||
const RefNameSize = 8 + stringRefSize
|
||||
|
||||
func (n *RefName) Sym() SymRef {
|
||||
return SymRef{binary.LittleEndian.Uint32(n[:]), binary.LittleEndian.Uint32(n[4:])}
|
||||
}
|
||||
func (n *RefName) Name(r *Reader) string {
|
||||
len := binary.LittleEndian.Uint32(n[8:])
|
||||
off := binary.LittleEndian.Uint32(n[12:])
|
||||
return r.StringAt(off, len)
|
||||
}
|
||||
|
||||
func (n *RefName) SetSym(x SymRef) {
|
||||
binary.LittleEndian.PutUint32(n[:], x.PkgIdx)
|
||||
binary.LittleEndian.PutUint32(n[4:], x.SymIdx)
|
||||
}
|
||||
func (n *RefName) SetName(x string, w *Writer) {
|
||||
binary.LittleEndian.PutUint32(n[8:], uint32(len(x)))
|
||||
binary.LittleEndian.PutUint32(n[12:], w.stringOff(x))
|
||||
}
|
||||
|
||||
func (n *RefName) Write(w *Writer) { w.Bytes(n[:]) }
|
||||
|
||||
type Writer struct {
|
||||
wr *bio.Writer
|
||||
stringMap map[string]uint32
|
||||
off uint32 // running offset
|
||||
}
|
||||
|
||||
func NewWriter(wr *bio.Writer) *Writer {
|
||||
return &Writer{wr: wr, stringMap: make(map[string]uint32)}
|
||||
}
|
||||
|
||||
func (w *Writer) AddString(s string) {
|
||||
if _, ok := w.stringMap[s]; ok {
|
||||
return
|
||||
}
|
||||
w.stringMap[s] = w.off
|
||||
w.RawString(s)
|
||||
}
|
||||
|
||||
func (w *Writer) stringOff(s string) uint32 {
|
||||
off, ok := w.stringMap[s]
|
||||
if !ok {
|
||||
panic(fmt.Sprintf("writeStringRef: string not added: %q", s))
|
||||
}
|
||||
return off
|
||||
}
|
||||
|
||||
func (w *Writer) StringRef(s string) {
|
||||
w.Uint32(uint32(len(s)))
|
||||
w.Uint32(w.stringOff(s))
|
||||
}
|
||||
|
||||
func (w *Writer) RawString(s string) {
|
||||
w.wr.WriteString(s)
|
||||
w.off += uint32(len(s))
|
||||
}
|
||||
|
||||
func (w *Writer) Bytes(s []byte) {
|
||||
w.wr.Write(s)
|
||||
w.off += uint32(len(s))
|
||||
}
|
||||
|
||||
func (w *Writer) Uint64(x uint64) {
|
||||
var b [8]byte
|
||||
binary.LittleEndian.PutUint64(b[:], x)
|
||||
w.wr.Write(b[:])
|
||||
w.off += 8
|
||||
}
|
||||
|
||||
func (w *Writer) Uint32(x uint32) {
|
||||
var b [4]byte
|
||||
binary.LittleEndian.PutUint32(b[:], x)
|
||||
w.wr.Write(b[:])
|
||||
w.off += 4
|
||||
}
|
||||
|
||||
func (w *Writer) Uint16(x uint16) {
|
||||
var b [2]byte
|
||||
binary.LittleEndian.PutUint16(b[:], x)
|
||||
w.wr.Write(b[:])
|
||||
w.off += 2
|
||||
}
|
||||
|
||||
func (w *Writer) Uint8(x uint8) {
|
||||
w.wr.WriteByte(x)
|
||||
w.off++
|
||||
}
|
||||
|
||||
func (w *Writer) Offset() uint32 {
|
||||
return w.off
|
||||
}
|
||||
|
||||
type Reader struct {
|
||||
b []byte // mmapped bytes, if not nil
|
||||
readonly bool // whether b is backed with read-only memory
|
||||
|
||||
rd io.ReaderAt
|
||||
start uint32
|
||||
h Header // keep block offsets
|
||||
}
|
||||
|
||||
func NewReaderFromBytes(b []byte, readonly bool) *Reader {
|
||||
r := &Reader{b: b, readonly: readonly, rd: bytes.NewReader(b), start: 0}
|
||||
err := r.h.Read(r)
|
||||
if err != nil {
|
||||
return nil
|
||||
}
|
||||
return r
|
||||
}
|
||||
|
||||
func (r *Reader) BytesAt(off uint32, len int) []byte {
|
||||
if len == 0 {
|
||||
return nil
|
||||
}
|
||||
end := int(off) + len
|
||||
return r.b[int(off):end:end]
|
||||
}
|
||||
|
||||
func (r *Reader) uint64At(off uint32) uint64 {
|
||||
b := r.BytesAt(off, 8)
|
||||
return binary.LittleEndian.Uint64(b)
|
||||
}
|
||||
|
||||
func (r *Reader) int64At(off uint32) int64 {
|
||||
return int64(r.uint64At(off))
|
||||
}
|
||||
|
||||
func (r *Reader) uint32At(off uint32) uint32 {
|
||||
b := r.BytesAt(off, 4)
|
||||
return binary.LittleEndian.Uint32(b)
|
||||
}
|
||||
|
||||
func (r *Reader) int32At(off uint32) int32 {
|
||||
return int32(r.uint32At(off))
|
||||
}
|
||||
|
||||
func (r *Reader) uint16At(off uint32) uint16 {
|
||||
b := r.BytesAt(off, 2)
|
||||
return binary.LittleEndian.Uint16(b)
|
||||
}
|
||||
|
||||
func (r *Reader) uint8At(off uint32) uint8 {
|
||||
b := r.BytesAt(off, 1)
|
||||
return b[0]
|
||||
}
|
||||
|
||||
func (r *Reader) StringAt(off uint32, len uint32) string {
|
||||
b := r.b[off : off+len]
|
||||
if r.readonly {
|
||||
return toString(b) // backed by RO memory, ok to make unsafe string
|
||||
}
|
||||
return string(b)
|
||||
}
|
||||
|
||||
func toString(b []byte) string {
|
||||
if len(b) == 0 {
|
||||
return ""
|
||||
}
|
||||
|
||||
var s string
|
||||
hdr := (*unsafeheader.String)(unsafe.Pointer(&s))
|
||||
hdr.Data = unsafe.Pointer(&b[0])
|
||||
hdr.Len = len(b)
|
||||
|
||||
return s
|
||||
}
|
||||
|
||||
func (r *Reader) StringRef(off uint32) string {
|
||||
l := r.uint32At(off)
|
||||
return r.StringAt(r.uint32At(off+4), l)
|
||||
}
|
||||
|
||||
func (r *Reader) Fingerprint() FingerprintType {
|
||||
return r.h.Fingerprint
|
||||
}
|
||||
|
||||
func (r *Reader) Autolib() []ImportedPkg {
|
||||
n := (r.h.Offsets[BlkAutolib+1] - r.h.Offsets[BlkAutolib]) / importedPkgSize
|
||||
s := make([]ImportedPkg, n)
|
||||
off := r.h.Offsets[BlkAutolib]
|
||||
for i := range s {
|
||||
s[i].Pkg = r.StringRef(off)
|
||||
copy(s[i].Fingerprint[:], r.BytesAt(off+stringRefSize, len(s[i].Fingerprint)))
|
||||
off += importedPkgSize
|
||||
}
|
||||
return s
|
||||
}
|
||||
|
||||
func (r *Reader) Pkglist() []string {
|
||||
n := (r.h.Offsets[BlkPkgIdx+1] - r.h.Offsets[BlkPkgIdx]) / stringRefSize
|
||||
s := make([]string, n)
|
||||
off := r.h.Offsets[BlkPkgIdx]
|
||||
for i := range s {
|
||||
s[i] = r.StringRef(off)
|
||||
off += stringRefSize
|
||||
}
|
||||
return s
|
||||
}
|
||||
|
||||
func (r *Reader) NPkg() int {
|
||||
return int(r.h.Offsets[BlkPkgIdx+1]-r.h.Offsets[BlkPkgIdx]) / stringRefSize
|
||||
}
|
||||
|
||||
func (r *Reader) Pkg(i int) string {
|
||||
off := r.h.Offsets[BlkPkgIdx] + uint32(i)*stringRefSize
|
||||
return r.StringRef(off)
|
||||
}
|
||||
|
||||
func (r *Reader) NFile() int {
|
||||
return int(r.h.Offsets[BlkFile+1]-r.h.Offsets[BlkFile]) / stringRefSize
|
||||
}
|
||||
|
||||
func (r *Reader) File(i int) string {
|
||||
off := r.h.Offsets[BlkFile] + uint32(i)*stringRefSize
|
||||
return r.StringRef(off)
|
||||
}
|
||||
|
||||
func (r *Reader) NSym() int {
|
||||
return int(r.h.Offsets[BlkSymdef+1]-r.h.Offsets[BlkSymdef]) / SymSize
|
||||
}
|
||||
|
||||
func (r *Reader) NHashed64def() int {
|
||||
return int(r.h.Offsets[BlkHashed64def+1]-r.h.Offsets[BlkHashed64def]) / SymSize
|
||||
}
|
||||
|
||||
func (r *Reader) NHasheddef() int {
|
||||
return int(r.h.Offsets[BlkHasheddef+1]-r.h.Offsets[BlkHasheddef]) / SymSize
|
||||
}
|
||||
|
||||
func (r *Reader) NNonpkgdef() int {
|
||||
return int(r.h.Offsets[BlkNonpkgdef+1]-r.h.Offsets[BlkNonpkgdef]) / SymSize
|
||||
}
|
||||
|
||||
func (r *Reader) NNonpkgref() int {
|
||||
return int(r.h.Offsets[BlkNonpkgref+1]-r.h.Offsets[BlkNonpkgref]) / SymSize
|
||||
}
|
||||
|
||||
// SymOff returns the offset of the i-th symbol.
|
||||
func (r *Reader) SymOff(i uint32) uint32 {
|
||||
return r.h.Offsets[BlkSymdef] + uint32(i*SymSize)
|
||||
}
|
||||
|
||||
// Sym returns a pointer to the i-th symbol.
|
||||
func (r *Reader) Sym(i uint32) *Sym {
|
||||
off := r.SymOff(i)
|
||||
return (*Sym)(unsafe.Pointer(&r.b[off]))
|
||||
}
|
||||
|
||||
// NRefFlags returns the number of referenced symbol flags.
|
||||
func (r *Reader) NRefFlags() int {
|
||||
return int(r.h.Offsets[BlkRefFlags+1]-r.h.Offsets[BlkRefFlags]) / RefFlagsSize
|
||||
}
|
||||
|
||||
// RefFlags returns a pointer to the i-th referenced symbol flags.
|
||||
// Note: here i is not a local symbol index, just a counter.
|
||||
func (r *Reader) RefFlags(i int) *RefFlags {
|
||||
off := r.h.Offsets[BlkRefFlags] + uint32(i*RefFlagsSize)
|
||||
return (*RefFlags)(unsafe.Pointer(&r.b[off]))
|
||||
}
|
||||
|
||||
// Hash64 returns the i-th short hashed symbol's hash.
|
||||
// Note: here i is the index of short hashed symbols, not all symbols
|
||||
// (unlike other accessors).
|
||||
func (r *Reader) Hash64(i uint32) uint64 {
|
||||
off := r.h.Offsets[BlkHash64] + uint32(i*Hash64Size)
|
||||
return r.uint64At(off)
|
||||
}
|
||||
|
||||
// Hash returns a pointer to the i-th hashed symbol's hash.
|
||||
// Note: here i is the index of hashed symbols, not all symbols
|
||||
// (unlike other accessors).
|
||||
func (r *Reader) Hash(i uint32) *HashType {
|
||||
off := r.h.Offsets[BlkHash] + uint32(i*HashSize)
|
||||
return (*HashType)(unsafe.Pointer(&r.b[off]))
|
||||
}
|
||||
|
||||
// NReloc returns the number of relocations of the i-th symbol.
|
||||
func (r *Reader) NReloc(i uint32) int {
|
||||
relocIdxOff := r.h.Offsets[BlkRelocIdx] + uint32(i*4)
|
||||
return int(r.uint32At(relocIdxOff+4) - r.uint32At(relocIdxOff))
|
||||
}
|
||||
|
||||
// RelocOff returns the offset of the j-th relocation of the i-th symbol.
|
||||
func (r *Reader) RelocOff(i uint32, j int) uint32 {
|
||||
relocIdxOff := r.h.Offsets[BlkRelocIdx] + uint32(i*4)
|
||||
relocIdx := r.uint32At(relocIdxOff)
|
||||
return r.h.Offsets[BlkReloc] + (relocIdx+uint32(j))*uint32(RelocSize)
|
||||
}
|
||||
|
||||
// Reloc returns a pointer to the j-th relocation of the i-th symbol.
|
||||
func (r *Reader) Reloc(i uint32, j int) *Reloc {
|
||||
off := r.RelocOff(i, j)
|
||||
return (*Reloc)(unsafe.Pointer(&r.b[off]))
|
||||
}
|
||||
|
||||
// Relocs returns a pointer to the relocations of the i-th symbol.
|
||||
func (r *Reader) Relocs(i uint32) []Reloc {
|
||||
off := r.RelocOff(i, 0)
|
||||
n := r.NReloc(i)
|
||||
return (*[1 << 20]Reloc)(unsafe.Pointer(&r.b[off]))[:n:n]
|
||||
}
|
||||
|
||||
// NAux returns the number of aux symbols of the i-th symbol.
|
||||
func (r *Reader) NAux(i uint32) int {
|
||||
auxIdxOff := r.h.Offsets[BlkAuxIdx] + i*4
|
||||
return int(r.uint32At(auxIdxOff+4) - r.uint32At(auxIdxOff))
|
||||
}
|
||||
|
||||
// AuxOff returns the offset of the j-th aux symbol of the i-th symbol.
|
||||
func (r *Reader) AuxOff(i uint32, j int) uint32 {
|
||||
auxIdxOff := r.h.Offsets[BlkAuxIdx] + i*4
|
||||
auxIdx := r.uint32At(auxIdxOff)
|
||||
return r.h.Offsets[BlkAux] + (auxIdx+uint32(j))*uint32(AuxSize)
|
||||
}
|
||||
|
||||
// Aux returns a pointer to the j-th aux symbol of the i-th symbol.
|
||||
func (r *Reader) Aux(i uint32, j int) *Aux {
|
||||
off := r.AuxOff(i, j)
|
||||
return (*Aux)(unsafe.Pointer(&r.b[off]))
|
||||
}
|
||||
|
||||
// Auxs returns the aux symbols of the i-th symbol.
|
||||
func (r *Reader) Auxs(i uint32) []Aux {
|
||||
off := r.AuxOff(i, 0)
|
||||
n := r.NAux(i)
|
||||
return (*[1 << 20]Aux)(unsafe.Pointer(&r.b[off]))[:n:n]
|
||||
}
|
||||
|
||||
// DataOff returns the offset of the i-th symbol's data.
|
||||
func (r *Reader) DataOff(i uint32) uint32 {
|
||||
dataIdxOff := r.h.Offsets[BlkDataIdx] + i*4
|
||||
return r.h.Offsets[BlkData] + r.uint32At(dataIdxOff)
|
||||
}
|
||||
|
||||
// DataSize returns the size of the i-th symbol's data.
|
||||
func (r *Reader) DataSize(i uint32) int {
|
||||
dataIdxOff := r.h.Offsets[BlkDataIdx] + i*4
|
||||
return int(r.uint32At(dataIdxOff+4) - r.uint32At(dataIdxOff))
|
||||
}
|
||||
|
||||
// Data returns the i-th symbol's data.
|
||||
func (r *Reader) Data(i uint32) []byte {
|
||||
dataIdxOff := r.h.Offsets[BlkDataIdx] + i*4
|
||||
base := r.h.Offsets[BlkData]
|
||||
off := r.uint32At(dataIdxOff)
|
||||
end := r.uint32At(dataIdxOff + 4)
|
||||
return r.BytesAt(base+off, int(end-off))
|
||||
}
|
||||
|
||||
// AuxDataBase returns the base offset of the aux data block.
|
||||
func (r *Reader) PcdataBase() uint32 {
|
||||
return r.h.Offsets[BlkPcdata]
|
||||
}
|
||||
|
||||
// NRefName returns the number of referenced symbol names.
|
||||
func (r *Reader) NRefName() int {
|
||||
return int(r.h.Offsets[BlkRefName+1]-r.h.Offsets[BlkRefName]) / RefNameSize
|
||||
}
|
||||
|
||||
// RefName returns a pointer to the i-th referenced symbol name.
|
||||
// Note: here i is not a local symbol index, just a counter.
|
||||
func (r *Reader) RefName(i int) *RefName {
|
||||
off := r.h.Offsets[BlkRefName] + uint32(i*RefNameSize)
|
||||
return (*RefName)(unsafe.Pointer(&r.b[off]))
|
||||
}
|
||||
|
||||
// ReadOnly returns whether r.BytesAt returns read-only bytes.
|
||||
func (r *Reader) ReadOnly() bool {
|
||||
return r.readonly
|
||||
}
|
||||
|
||||
// Flags returns the flag bits read from the object file header.
|
||||
func (r *Reader) Flags() uint32 {
|
||||
return r.h.Flags
|
||||
}
|
||||
|
||||
func (r *Reader) Shared() bool { return r.Flags()&ObjFlagShared != 0 }
|
||||
func (r *Reader) NeedNameExpansion() bool { return r.Flags()&ObjFlagNeedNameExpansion != 0 }
|
||||
func (r *Reader) FromAssembly() bool { return r.Flags()&ObjFlagFromAssembly != 0 }
|
||||
Reference in New Issue
Block a user