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go/src/cmd/internal/obj/data.go
Russ Cox 532ccae154 cmd/internal/obj: replace Addr.U struct {...} with Val interface{} 
An interface{} is more in the spirit of the original union.
By my calculations, on 64-bit systems this reduces
Addr from 120 to 80 bytes, and Prog from 592 to 424 bytes.

Change-Id: I0d7b0981513c2a3c94c9ac76bb4f8816485b5a3c
Reviewed-on: https://go-review.googlesource.com/7744
Reviewed-by: Rob Pike <r@golang.org>
2015-03-20 04:47:08 +00:00

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// Derived from Inferno utils/6l/obj.c and utils/6l/span.c
// http://code.google.com/p/inferno-os/source/browse/utils/6l/obj.c
// http://code.google.com/p/inferno-os/source/browse/utils/6l/span.c
//
// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
// Portions Copyright © 1997-1999 Vita Nuova Limited
// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
// Portions Copyright © 2004,2006 Bruce Ellis
// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
// Portions Copyright © 2009 The Go Authors. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package obj
import (
"log"
"math"
)
func mangle(file string) {
log.Fatalf("%s: mangled input file", file)
}
func Symgrow(ctxt *Link, s *LSym, lsiz int64) {
siz := int(lsiz)
if int64(siz) != lsiz {
log.Fatalf("Symgrow size %d too long", lsiz)
}
if len(s.P) >= siz {
return
}
for cap(s.P) < siz {
s.P = append(s.P[:cap(s.P)], 0)
}
s.P = s.P[:siz]
}
func savedata(ctxt *Link, s *LSym, p *Prog, pn string) {
off := int32(p.From.Offset)
siz := int32(p.From3.Offset)
if off < 0 || siz < 0 || off >= 1<<30 || siz >= 100 {
mangle(pn)
}
if ctxt.Enforce_data_order != 0 && off < int32(len(s.P)) {
ctxt.Diag("data out of order (already have %d)\n%P", len(s.P), p)
}
Symgrow(ctxt, s, int64(off+siz))
switch int(p.To.Type) {
default:
ctxt.Diag("bad data: %P", p)
case TYPE_FCONST:
switch siz {
default:
ctxt.Diag("unexpected %d-byte floating point constant", siz)
case 4:
flt := math.Float32bits(float32(p.To.Val.(float64)))
ctxt.Arch.ByteOrder.PutUint32(s.P[off:], flt)
case 8:
flt := math.Float64bits(p.To.Val.(float64))
ctxt.Arch.ByteOrder.PutUint64(s.P[off:], flt)
}
case TYPE_SCONST:
copy(s.P[off:off+siz], p.To.Val.(string))
case TYPE_CONST, TYPE_ADDR:
if p.To.Sym != nil || int(p.To.Type) == TYPE_ADDR {
r := Addrel(s)
r.Off = off
r.Siz = uint8(siz)
r.Sym = p.To.Sym
r.Type = R_ADDR
r.Add = p.To.Offset
break
}
o := p.To.Offset
switch siz {
default:
ctxt.Diag("unexpected %d-byte integer constant", siz)
case 1:
s.P[off] = byte(o)
case 2:
ctxt.Arch.ByteOrder.PutUint16(s.P[off:], uint16(o))
case 4:
ctxt.Arch.ByteOrder.PutUint32(s.P[off:], uint32(o))
case 8:
ctxt.Arch.ByteOrder.PutUint64(s.P[off:], uint64(o))
}
}
}
func Addrel(s *LSym) *Reloc {
s.R = append(s.R, Reloc{})
return &s.R[len(s.R)-1]
}
func Setuintxx(ctxt *Link, s *LSym, off int64, v uint64, wid int64) int64 {
if s.Type == 0 {
s.Type = SDATA
}
s.Reachable = 1
if s.Size < off+wid {
s.Size = off + wid
Symgrow(ctxt, s, s.Size)
}
switch wid {
case 1:
s.P[off] = uint8(v)
case 2:
ctxt.Arch.ByteOrder.PutUint16(s.P[off:], uint16(v))
case 4:
ctxt.Arch.ByteOrder.PutUint32(s.P[off:], uint32(v))
case 8:
ctxt.Arch.ByteOrder.PutUint64(s.P[off:], uint64(v))
}
return off + wid
}
func adduintxx(ctxt *Link, s *LSym, v uint64, wid int) int64 {
off := s.Size
Setuintxx(ctxt, s, off, v, int64(wid))
return off
}
func adduint8(ctxt *Link, s *LSym, v uint8) int64 {
return adduintxx(ctxt, s, uint64(v), 1)
}
func adduint16(ctxt *Link, s *LSym, v uint16) int64 {
return adduintxx(ctxt, s, uint64(v), 2)
}
func Adduint32(ctxt *Link, s *LSym, v uint32) int64 {
return adduintxx(ctxt, s, uint64(v), 4)
}
func Adduint64(ctxt *Link, s *LSym, v uint64) int64 {
return adduintxx(ctxt, s, v, 8)
}
func setuint8(ctxt *Link, s *LSym, r int64, v uint8) int64 {
return Setuintxx(ctxt, s, r, uint64(v), 1)
}
func setuint16(ctxt *Link, s *LSym, r int64, v uint16) int64 {
return Setuintxx(ctxt, s, r, uint64(v), 2)
}
func setuint32(ctxt *Link, s *LSym, r int64, v uint32) int64 {
return Setuintxx(ctxt, s, r, uint64(v), 4)
}
func setuint64(ctxt *Link, s *LSym, r int64, v uint64) int64 {
return Setuintxx(ctxt, s, r, v, 8)
}
func addaddrplus(ctxt *Link, s *LSym, t *LSym, add int64) int64 {
if s.Type == 0 {
s.Type = SDATA
}
s.Reachable = 1
i := s.Size
s.Size += int64(ctxt.Arch.Ptrsize)
Symgrow(ctxt, s, s.Size)
r := Addrel(s)
r.Sym = t
r.Off = int32(i)
r.Siz = uint8(ctxt.Arch.Ptrsize)
r.Type = R_ADDR
r.Add = add
return i + int64(r.Siz)
}
func addpcrelplus(ctxt *Link, s *LSym, t *LSym, add int64) int64 {
if s.Type == 0 {
s.Type = SDATA
}
s.Reachable = 1
i := s.Size
s.Size += 4
Symgrow(ctxt, s, s.Size)
r := Addrel(s)
r.Sym = t
r.Off = int32(i)
r.Add = add
r.Type = R_PCREL
r.Siz = 4
return i + int64(r.Siz)
}
func addaddr(ctxt *Link, s *LSym, t *LSym) int64 {
return addaddrplus(ctxt, s, t, 0)
}
func setaddrplus(ctxt *Link, s *LSym, off int64, t *LSym, add int64) int64 {
if s.Type == 0 {
s.Type = SDATA
}
s.Reachable = 1
if off+int64(ctxt.Arch.Ptrsize) > s.Size {
s.Size = off + int64(ctxt.Arch.Ptrsize)
Symgrow(ctxt, s, s.Size)
}
r := Addrel(s)
r.Sym = t
r.Off = int32(off)
r.Siz = uint8(ctxt.Arch.Ptrsize)
r.Type = R_ADDR
r.Add = add
return off + int64(r.Siz)
}
func setaddr(ctxt *Link, s *LSym, off int64, t *LSym) int64 {
return setaddrplus(ctxt, s, off, t, 0)
}
func addsize(ctxt *Link, s *LSym, t *LSym) int64 {
if s.Type == 0 {
s.Type = SDATA
}
s.Reachable = 1
i := s.Size
s.Size += int64(ctxt.Arch.Ptrsize)
Symgrow(ctxt, s, s.Size)
r := Addrel(s)
r.Sym = t
r.Off = int32(i)
r.Siz = uint8(ctxt.Arch.Ptrsize)
r.Type = R_SIZE
return i + int64(r.Siz)
}
func addaddrplus4(ctxt *Link, s *LSym, t *LSym, add int64) int64 {
if s.Type == 0 {
s.Type = SDATA
}
s.Reachable = 1
i := s.Size
s.Size += 4
Symgrow(ctxt, s, s.Size)
r := Addrel(s)
r.Sym = t
r.Off = int32(i)
r.Siz = 4
r.Type = R_ADDR
r.Add = add
return i + int64(r.Siz)
}
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