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[dev.link] cmd/link: move new decodesym utility routines to a separate file

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Relocate the various new functions for decoding type.* symbol payloads
(using new loader interfaces) to a new file, as opposed to having them
tacked onto the end of deadcode2.go.

Change-Id: I830a8d1b63d70d5bcbc213f2388d00e12f009a77
Reviewed-on: https://go-review.googlesource.com/c/go/+/211305
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Than McIntosh 2019-12-13 13:45:15 -05:00
parent 026b98a2a2
commit ca90d3de9f
2 changed files with 59 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
src/cmd/link/internal/ld/deadcode2.go
View File

@ -318,7 +318,7 @@ func (d *deadcodePass2) decodeMethodSig2(ldr *loader.Loader, arch *sys.Arch, sym
if i > 0 {
buf.WriteString(", ")
}
a := d.decodetypeFuncInType2(ldr, arch, mtypSym, d.rtmp, i)
a := decodetypeFuncInType2(ldr, arch, mtypSym, d.rtmp, i)
buf.WriteString(ldr.SymName(a))
}
buf.WriteString(") (")
@ -327,7 +327,7 @@ func (d *deadcodePass2) decodeMethodSig2(ldr *loader.Loader, arch *sys.Arch, sym
if i > 0 {
buf.WriteString(", ")
}
a := d.decodetypeFuncOutType2(ldr, arch, mtypSym, d.rtmp, i)
a := decodetypeFuncOutType2(ldr, arch, mtypSym, d.rtmp, i)
buf.WriteString(ldr.SymName(a))
}
buf.WriteRune(')')
@ -391,47 +391,6 @@ func (d *deadcodePass2) decodetypeMethods2(ldr *loader.Loader, arch *sys.Arch, s
return d.decodeMethodSig2(ldr, arch, symIdx, symRelocs, off, sizeofMethod, mcount)
}
func decodeReloc2(ldr *loader.Loader, symIdx loader.Sym, symRelocs []loader.Reloc, off int32) loader.Reloc {
for j := 0; j < len(symRelocs); j++ {
rel := symRelocs[j]
if rel.Off == off {
return rel
}
}
return loader.Reloc{}
}
func decodeRelocSym2(ldr *loader.Loader, symIdx loader.Sym, symRelocs []loader.Reloc, off int32) loader.Sym {
return decodeReloc2(ldr, symIdx, symRelocs, off).Sym
}
// decodetypeName2 decodes the name from a reflect.name.
func decodetypeName2(ldr *loader.Loader, symIdx loader.Sym, symRelocs []loader.Reloc, off int) string {
r := decodeRelocSym2(ldr, symIdx, symRelocs, int32(off))
if r == 0 {
return ""
}
data := ldr.Data(r)
namelen := int(uint16(data[1])<<8 | uint16(data[2]))
return string(data[3 : 3+namelen])
}
func (d *deadcodePass2) decodetypeFuncInType2(ldr *loader.Loader, arch *sys.Arch, symIdx loader.Sym, symRelocs []loader.Reloc, i int) loader.Sym {
uadd := commonsize(arch) + 4
if arch.PtrSize == 8 {
uadd += 4
}
if decodetypeHasUncommon(arch, ldr.Data(symIdx)) {
uadd += uncommonSize()
}
return decodeRelocSym2(ldr, symIdx, symRelocs, int32(uadd+i*arch.PtrSize))
}
func (d *deadcodePass2) decodetypeFuncOutType2(ldr *loader.Loader, arch *sys.Arch, symIdx loader.Sym, symRelocs []loader.Reloc, i int) loader.Sym {
return d.decodetypeFuncInType2(ldr, arch, symIdx, symRelocs, i+decodetypeFuncInCount(arch, ldr.Data(symIdx)))
}
// readRelocs reads the relocations for the specified symbol into the
// deadcode relocs work array. Use with care, since the work array
// is a singleton.

57
src/cmd/link/internal/ld/decodesym2.go Normal file
View File

@ -0,0 +1,57 @@
// 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 ld
import (
"cmd/internal/sys"
"cmd/link/internal/loader"
)
// This file contains utilities to decode type.* symbols, for
// loader.Sym symbols (uses new loader interfaces).
// At some point we'll want to migrate the contents of this file
// to decodesym.go once the rouetines there have been decprecated + removed.
func decodeReloc2(ldr *loader.Loader, symIdx loader.Sym, symRelocs []loader.Reloc, off int32) loader.Reloc {
for j := 0; j < len(symRelocs); j++ {
rel := symRelocs[j]
if rel.Off == off {
return rel
}
}
return loader.Reloc{}
}
func decodeRelocSym2(ldr *loader.Loader, symIdx loader.Sym, symRelocs []loader.Reloc, off int32) loader.Sym {
return decodeReloc2(ldr, symIdx, symRelocs, off).Sym
}
// decodetypeName2 decodes the name from a reflect.name.
func decodetypeName2(ldr *loader.Loader, symIdx loader.Sym, symRelocs []loader.Reloc, off int) string {
r := decodeRelocSym2(ldr, symIdx, symRelocs, int32(off))
if r == 0 {
return ""
}
data := ldr.Data(r)
namelen := int(uint16(data[1])<<8 | uint16(data[2]))
return string(data[3 : 3+namelen])
}
func decodetypeFuncInType2(ldr *loader.Loader, arch *sys.Arch, symIdx loader.Sym, symRelocs []loader.Reloc, i int) loader.Sym {
uadd := commonsize(arch) + 4
if arch.PtrSize == 8 {
uadd += 4
}
if decodetypeHasUncommon(arch, ldr.Data(symIdx)) {
uadd += uncommonSize()
}
return decodeRelocSym2(ldr, symIdx, symRelocs, int32(uadd+i*arch.PtrSize))
}
func decodetypeFuncOutType2(ldr *loader.Loader, arch *sys.Arch, symIdx loader.Sym, symRelocs []loader.Reloc, i int) loader.Sym {
return decodetypeFuncInType2(ldr, arch, symIdx, symRelocs, i+decodetypeFuncInCount(arch, ldr.Data(symIdx)))
}