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// 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.
package goobj
import (
"cmd/internal/goobj2"
"cmd/internal/objabi"
"fmt"
"strings"
)
// Read object file in new format. For now we still fill
// the data to the current goobj API.
func (r *objReader) readNew() {
start := uint32(r.offset)
length := r.limit - r.offset
objbytes := make([]byte, length)
r.readFull(objbytes)
rr := goobj2.NewReaderFromBytes(objbytes, false)
if rr == nil {
panic("cannot read object file")
}
// Imports
r.p.Imports = rr.Autolib()
pkglist := rr.Pkglist()
abiToVer := func(abi uint16) int64 {
var vers int64
if abi == goobj2.SymABIstatic {
// Static symbol
vers = r.p.MaxVersion
}
return vers
}
resolveSymRef := func(s goobj2.SymRef) SymID {
var i int
switch p := s.PkgIdx; p {
case goobj2.PkgIdxInvalid:
if s.SymIdx != 0 {
panic("bad sym ref")
}
return SymID{}
case goobj2.PkgIdxNone:
i = int(s.SymIdx) + rr.NSym()
case goobj2.PkgIdxBuiltin:
name, abi := goobj2.BuiltinName(int(s.SymIdx))
return SymID{name, int64(abi)}
case goobj2.PkgIdxSelf:
i = int(s.SymIdx)
default:
pkg := pkglist[p]
return SymID{fmt.Sprintf("%s.<#%d>", pkg, s.SymIdx), 0}
}
sym := goobj2.Sym{}
sym.Read(rr, rr.SymOff(i))
return SymID{sym.Name, abiToVer(sym.ABI)}
}
// Read things for the current goobj API for now.
// Symbols
pcdataBase := start + rr.PcdataBase()
n := rr.NSym() + rr.NNonpkgdef() + rr.NNonpkgref()
ndef := rr.NSym() + rr.NNonpkgdef()
for i := 0; i < n; i++ {
osym := goobj2.Sym{}
osym.Read(rr, rr.SymOff(i))
if osym.Name == "" {
continue // not a real symbol
}
// In a symbol name in an object file, "". denotes the
// prefix for the package in which the object file has been found.
// Expand it.
name := strings.ReplaceAll(osym.Name, `"".`, r.pkgprefix)
symID := SymID{Name: name, Version: abiToVer(osym.ABI)}
r.p.SymRefs = append(r.p.SymRefs, symID)
if i >= ndef {
continue // not a defined symbol from here
}
// Symbol data
dataOff := rr.DataOff(i)
siz := int64(rr.DataSize(i))
sym := Sym{
SymID: symID,
Kind: objabi.SymKind(osym.Type),
DupOK: osym.Dupok(),
Size: int64(osym.Siz),
Data: Data{int64(start + dataOff), siz},
}
r.p.Syms = append(r.p.Syms, &sym)
// Reloc
nreloc := rr.NReloc(i)
sym.Reloc = make([]Reloc, nreloc)
for j := 0; j < nreloc; j++ {
rel := goobj2.Reloc{}
rel.Read(rr, rr.RelocOff(i, j))
sym.Reloc[j] = Reloc{
Offset: int64(rel.Off),
Size: int64(rel.Siz),
Type: objabi.RelocType(rel.Type),
Add: rel.Add,
Sym: resolveSymRef(rel.Sym),
}
}
// Aux symbol info
isym := -1
funcdata := make([]goobj2.SymRef, 0, 4)
naux := rr.NAux(i)
for j := 0; j < naux; j++ {
a := goobj2.Aux{}
a.Read(rr, rr.AuxOff(i, j))
switch a.Type {
case goobj2.AuxGotype:
sym.Type = resolveSymRef(a.Sym)
case goobj2.AuxFuncInfo:
if a.Sym.PkgIdx != goobj2.PkgIdxSelf {
panic("funcinfo symbol not defined in current package")
}
isym = int(a.Sym.SymIdx)
case goobj2.AuxFuncdata:
funcdata = append(funcdata, a.Sym)
case goobj2.AuxDwarfInfo, goobj2.AuxDwarfLoc, goobj2.AuxDwarfRanges, goobj2.AuxDwarfLines:
// nothing to do
default:
panic("unknown aux type")
}
}
// Symbol Info
if isym == -1 {
continue
}
b := rr.BytesAt(rr.DataOff(isym), rr.DataSize(isym))
info := goobj2.FuncInfo{}
info.Read(b)
info.Pcdata = append(info.Pcdata, info.PcdataEnd) // for the ease of knowing where it ends
f := &Func{
Args: int64(info.Args),
Frame: int64(info.Locals),
NoSplit: info.NoSplit != 0,
Leaf: osym.Leaf(),
TopFrame: osym.TopFrame(),
PCSP: Data{int64(pcdataBase + info.Pcsp), int64(info.Pcfile - info.Pcsp)},
PCFile: Data{int64(pcdataBase + info.Pcfile), int64(info.Pcline - info.Pcfile)},
PCLine: Data{int64(pcdataBase + info.Pcline), int64(info.Pcinline - info.Pcline)},
PCInline: Data{int64(pcdataBase + info.Pcinline), int64(info.Pcdata[0] - info.Pcinline)},
PCData: make([]Data, len(info.Pcdata)-1), // -1 as we appended one above
FuncData: make([]FuncData, len(info.Funcdataoff)),
File: make([]string, len(info.File)),
InlTree: make([]InlinedCall, len(info.InlTree)),
}
sym.Func = f
for k := range f.PCData {
f.PCData[k] = Data{int64(pcdataBase + info.Pcdata[k]), int64(info.Pcdata[k+1] - info.Pcdata[k])}
}
for k := range f.FuncData {
symID := resolveSymRef(funcdata[k])
f.FuncData[k] = FuncData{symID, int64(info.Funcdataoff[k])}
}
for k := range f.File {
symID := resolveSymRef(info.File[k])
f.File[k] = symID.Name
}
for k := range f.InlTree {
inl := &info.InlTree[k]
f.InlTree[k] = InlinedCall{
Parent: int64(inl.Parent),
File: resolveSymRef(inl.File).Name,
Line: int64(inl.Line),
Func: resolveSymRef(inl.Func),
ParentPC: int64(inl.ParentPC),
}
}
}
}
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