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https://github.com/golang/go
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[dev.link] cmd/link: simplify DWARF DIE symbol payload
Get rid of of the linker's dwSym struct (which wraps a loader.Loader and a loader.Sym) in favor of just loader.Sym. This requires some minor tweaks to the cmd/internal/dwarf interfaces. Change-Id: Id3ffd7c41b2433ea04417040368700334bb0e611 Reviewed-on: https://go-review.googlesource.com/c/go/+/220982 Run-TryBot: Than McIntosh <thanm@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com> Reviewed-by: Jeremy Faller <jeremy@golang.org>
This commit is contained in:
parent
23c52de5fc
commit
48c79db07f
@ -48,7 +48,7 @@ var logDwarf bool
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// Sym represents a symbol.
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type Sym interface {
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Len() int64
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Length(dwarfContext interface{}) int64
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}
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// A Var represents a local variable or a function parameter.
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@ -1279,7 +1279,7 @@ func PutInlinedFunc(ctxt Context, s *FnState, callersym Sym, callIdx int) error
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putattr(ctxt, s.Info, abbrev, DW_FORM_ref_addr, DW_CLS_REFERENCE, 0, callee)
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if abbrev == DW_ABRV_INLINED_SUBROUTINE_RANGES {
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putattr(ctxt, s.Info, abbrev, DW_FORM_sec_offset, DW_CLS_PTR, s.Ranges.Len(), s.Ranges)
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putattr(ctxt, s.Info, abbrev, DW_FORM_sec_offset, DW_CLS_PTR, s.Ranges.Length(ctxt), s.Ranges)
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s.PutRanges(ctxt, ic.Ranges)
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} else {
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st := ic.Ranges[0].Start
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@ -1440,7 +1440,7 @@ func putscope(ctxt Context, s *FnState, scopes []Scope, curscope int32, fnabbrev
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putattr(ctxt, s.Info, DW_ABRV_LEXICAL_BLOCK_SIMPLE, DW_FORM_addr, DW_CLS_ADDRESS, scope.Ranges[0].End, s.StartPC)
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} else {
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Uleb128put(ctxt, s.Info, DW_ABRV_LEXICAL_BLOCK_RANGES)
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putattr(ctxt, s.Info, DW_ABRV_LEXICAL_BLOCK_RANGES, DW_FORM_sec_offset, DW_CLS_PTR, s.Ranges.Len(), s.Ranges)
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putattr(ctxt, s.Info, DW_ABRV_LEXICAL_BLOCK_RANGES, DW_FORM_sec_offset, DW_CLS_PTR, s.Ranges.Length(ctxt), s.Ranges)
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s.PutRanges(ctxt, scope.Ranges)
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}
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@ -1585,7 +1585,7 @@ func putvar(ctxt Context, s *FnState, v *Var, absfn Sym, fnabbrev, inlIndex int,
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}
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if abbrevUsesLoclist(abbrev) {
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putattr(ctxt, s.Info, abbrev, DW_FORM_sec_offset, DW_CLS_PTR, s.Loc.Len(), s.Loc)
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putattr(ctxt, s.Info, abbrev, DW_FORM_sec_offset, DW_CLS_PTR, s.Loc.Length(ctxt), s.Loc)
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v.PutLocationList(s.Loc, s.StartPC)
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} else {
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loc := encbuf[:0]
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@ -216,7 +216,7 @@ func (ctxt *Link) dwarfSym(s *LSym) (dwarfInfoSym, dwarfLocSym, dwarfRangesSym,
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return s.Func.dwarfInfoSym, s.Func.dwarfLocSym, s.Func.dwarfRangesSym, s.Func.dwarfAbsFnSym, s.Func.dwarfDebugLinesSym
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}
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func (s *LSym) Len() int64 {
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func (s *LSym) Length(dwarfContext interface{}) int64 {
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return s.Size
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}
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@ -70,60 +70,70 @@ func newdwctxt2(linkctxt *Link, forTypeGen bool) dwctxt2 {
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return d
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}
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// dwSym wraps a loader.Sym; this type is meant to obey the interface
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// rules for dwarf.Sym from the cmd/internal/dwarf package. DwDie and
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// DwAttr objects contain references to symbols via this type.
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type dwSym loader.Sym
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func (s dwSym) Length(dwarfContext interface{}) int64 {
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l := dwarfContext.(dwctxt2).ldr
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return int64(len(l.Data(loader.Sym(s))))
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}
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func (c dwctxt2) PtrSize() int {
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return c.arch.PtrSize
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}
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func (c dwctxt2) AddInt(s dwarf.Sym, size int, i int64) {
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ds := s.(dwSym)
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dsu := ds.l.MakeSymbolUpdater(ds.s)
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ds := loader.Sym(s.(dwSym))
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dsu := c.ldr.MakeSymbolUpdater(ds)
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dsu.AddUintXX(c.arch, uint64(i), size)
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}
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func (c dwctxt2) AddBytes(s dwarf.Sym, b []byte) {
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ds := s.(dwSym)
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dsu := ds.l.MakeSymbolUpdater(ds.s)
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ds := loader.Sym(s.(dwSym))
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dsu := c.ldr.MakeSymbolUpdater(ds)
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dsu.AddBytes(b)
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}
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func (c dwctxt2) AddString(s dwarf.Sym, v string) {
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ds := s.(dwSym)
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dsu := ds.l.MakeSymbolUpdater(ds.s)
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ds := loader.Sym(s.(dwSym))
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dsu := c.ldr.MakeSymbolUpdater(ds)
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dsu.Addstring(v)
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}
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func (c dwctxt2) AddAddress(s dwarf.Sym, data interface{}, value int64) {
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ds := s.(dwSym)
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dsu := ds.l.MakeSymbolUpdater(ds.s)
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ds := loader.Sym(s.(dwSym))
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dsu := c.ldr.MakeSymbolUpdater(ds)
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if value != 0 {
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value -= dsu.Value()
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}
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tgtds := data.(dwSym)
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dsu.AddAddrPlus(c.arch, tgtds.s, value)
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tgtds := loader.Sym(data.(dwSym))
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dsu.AddAddrPlus(c.arch, tgtds, value)
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}
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func (c dwctxt2) AddCURelativeAddress(s dwarf.Sym, data interface{}, value int64) {
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ds := s.(dwSym)
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dsu := ds.l.MakeSymbolUpdater(ds.s)
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ds := loader.Sym(s.(dwSym))
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dsu := c.ldr.MakeSymbolUpdater(ds)
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if value != 0 {
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value -= dsu.Value()
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}
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tgtds := data.(dwSym)
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dsu.AddCURelativeAddrPlus(c.arch, tgtds.s, value)
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tgtds := loader.Sym(data.(dwSym))
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dsu.AddCURelativeAddrPlus(c.arch, tgtds, value)
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}
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func (c dwctxt2) AddSectionOffset(s dwarf.Sym, size int, t interface{}, ofs int64) {
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ds := s.(dwSym)
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dsu := ds.l.MakeSymbolUpdater(ds.s)
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tds := t.(dwSym)
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ds := loader.Sym(s.(dwSym))
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dsu := c.ldr.MakeSymbolUpdater(ds)
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tds := loader.Sym(t.(dwSym))
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switch size {
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default:
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c.linkctxt.Errorf(ds.s, "invalid size %d in adddwarfref\n", size)
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c.linkctxt.Errorf(ds, "invalid size %d in adddwarfref\n", size)
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fallthrough
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case c.arch.PtrSize:
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dsu.AddAddrPlus(c.arch, tds.s, 0)
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dsu.AddAddrPlus(c.arch, tds, 0)
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case 4:
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dsu.AddAddrPlus4(c.arch, tds.s, 0)
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dsu.AddAddrPlus4(c.arch, tds, 0)
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}
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rsl := dsu.Relocs()
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r := &rsl[len(rsl)-1]
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@ -139,8 +149,8 @@ func (c dwctxt2) AddDWARFAddrSectionOffset(s dwarf.Sym, t interface{}, ofs int64
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c.AddSectionOffset(s, size, t, ofs)
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ds := s.(dwSym)
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dsu := ds.l.MakeSymbolUpdater(ds.s)
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ds := loader.Sym(s.(dwSym))
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dsu := c.ldr.MakeSymbolUpdater(ds)
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rsl := dsu.Relocs()
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r := &rsl[len(rsl)-1]
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r.Type = objabi.R_DWARFSECREF
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@ -168,23 +178,6 @@ func (c dwctxt2) RecordChildDieOffsets(s dwarf.Sym, vars []*dwarf.Var, offsets [
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panic("should be used only in the compiler")
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}
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// dwSym wraps a loader.Sym; objects of this type are stored
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// in the 'Sym' field of dwarf.DIE objects.
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//
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// FIXME: the main reason we need the loader.Loader pointer field is
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// that the dwarf.Sym interface has a Len() method with no parameters.
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// If we changed this method to accept a dwxtxt (from which we could
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// access the loader) then we could get rid of this field and/or avoid
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// using a struct.
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type dwSym struct {
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s loader.Sym
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l *loader.Loader
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}
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func (s dwSym) Len() int64 {
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return int64(len(s.l.Data(s.s)))
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}
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var gdbscript string
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var dwarfp2 []loader.Sym
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@ -264,7 +257,7 @@ func (d *dwctxt2) newdie(parent *dwarf.DWDie, abbrev int, name string, version i
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dsu.SetType(sym.SDWARFINFO)
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d.ldr.SetAttrNotInSymbolTable(ds, true)
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d.ldr.SetAttrReachable(ds, true)
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die.Sym = dwSym{s: ds, l: d.ldr}
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die.Sym = dwSym(ds)
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if abbrev >= dwarf.DW_ABRV_NULLTYPE && abbrev <= dwarf.DW_ABRV_TYPEDECL {
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d.tmap[name] = ds
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}
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@ -361,15 +354,15 @@ func (d *dwctxt2) newrefattr(die *dwarf.DWDie, attr uint16, ref loader.Sym) *dwa
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if ref == 0 {
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return nil
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}
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return newattr(die, attr, dwarf.DW_CLS_REFERENCE, 0, dwSym{s: ref, l: d.ldr})
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return newattr(die, attr, dwarf.DW_CLS_REFERENCE, 0, dwSym(ref))
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}
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func (d *dwctxt2) dtolsym(s dwarf.Sym) loader.Sym {
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if s == nil {
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return 0
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}
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dws := s.(dwSym)
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return dws.s
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dws := loader.Sym(s.(dwSym))
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return dws
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}
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func (d *dwctxt2) putdie(syms []loader.Sym, die *dwarf.DWDie) []loader.Sym {
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@ -405,7 +398,7 @@ func newmemberoffsetattr(die *dwarf.DWDie, offs int32) {
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// GDB doesn't like FORM_addr for AT_location, so emit a
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// location expression that evals to a const.
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func (d *dwctxt2) newabslocexprattr(die *dwarf.DWDie, addr int64, symIdx loader.Sym) {
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newattr(die, dwarf.DW_AT_location, dwarf.DW_CLS_ADDRESS, addr, dwSym{s: symIdx, l: d.ldr})
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newattr(die, dwarf.DW_AT_location, dwarf.DW_CLS_ADDRESS, addr, dwSym(symIdx))
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}
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func (d *dwctxt2) lookupOrDiag(n string) loader.Sym {
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@ -444,7 +437,7 @@ func (d *dwctxt2) dotypedef(parent *dwarf.DWDie, gotype loader.Sym, name string,
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tds := d.ldr.CreateExtSym("")
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tdsu := d.ldr.MakeSymbolUpdater(tds)
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tdsu.SetType(sym.SDWARFINFO)
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def.Sym = dwSym{s: tds, l: d.ldr}
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def.Sym = dwSym(tds)
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d.ldr.SetAttrNotInSymbolTable(tds, true)
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d.ldr.SetAttrReachable(tds, true)
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@ -483,8 +476,8 @@ func (d *dwctxt2) defgotype(gotype loader.Sym) loader.Sym {
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}
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gtdwSym := d.newtype(gotype)
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d.tdmap[gotype] = gtdwSym.Sym.(dwSym).s
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return gtdwSym.Sym.(dwSym).s
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d.tdmap[gotype] = loader.Sym(gtdwSym.Sym.(dwSym))
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return loader.Sym(gtdwSym.Sym.(dwSym))
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}
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func (d *dwctxt2) newtype(gotype loader.Sym) *dwarf.DWDie {
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@ -654,7 +647,7 @@ func (d *dwctxt2) newtype(gotype loader.Sym) *dwarf.DWDie {
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newattr(die, dwarf.DW_AT_go_kind, dwarf.DW_CLS_CONSTANT, int64(kind), 0)
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if d.ldr.AttrReachable(gotype) {
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newattr(die, dwarf.DW_AT_go_runtime_type, dwarf.DW_CLS_GO_TYPEREF, 0, dwSym{s: gotype, l: d.ldr})
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newattr(die, dwarf.DW_AT_go_runtime_type, dwarf.DW_CLS_GO_TYPEREF, 0, dwSym(gotype))
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}
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// Sanity check.
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@ -662,11 +655,11 @@ func (d *dwctxt2) newtype(gotype loader.Sym) *dwarf.DWDie {
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log.Fatalf("internal error: rtmap entry already installed\n")
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}
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ds := die.Sym.(dwSym)
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ds := loader.Sym(die.Sym.(dwSym))
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if typedefdie != nil {
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ds = typedefdie.Sym.(dwSym)
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ds = loader.Sym(typedefdie.Sym.(dwSym))
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}
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d.rtmap[ds.s] = gotype
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d.rtmap[ds] = gotype
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if _, ok := prototypedies[sn]; ok {
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prototypedies[sn] = die
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@ -702,13 +695,13 @@ func (d *dwctxt2) defptrto(dwtype loader.Sym) loader.Sym {
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// pointers of slices. Link to the ones we can find.
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gts := d.ldr.Lookup("type."+ptrname, 0)
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if gts != 0 && d.ldr.AttrReachable(gts) {
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newattr(pdie, dwarf.DW_AT_go_runtime_type, dwarf.DW_CLS_GO_TYPEREF, 0, dwSym{s: gts, l: d.ldr})
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newattr(pdie, dwarf.DW_AT_go_runtime_type, dwarf.DW_CLS_GO_TYPEREF, 0, dwSym(gts))
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}
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if gts != 0 {
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ds := pdie.Sym.(dwSym)
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d.rtmap[ds.s] = gts
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d.tdmap[gts] = ds.s
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ds := loader.Sym(pdie.Sym.(dwSym))
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d.rtmap[ds] = gts
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d.tdmap[gts] = ds
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}
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return d.dtolsym(pdie.Sym)
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@ -748,7 +741,7 @@ func (d *dwctxt2) substitutetype(structdie *dwarf.DWDie, field string, dwtype lo
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a := getattr(child, dwarf.DW_AT_type)
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if a != nil {
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a.Data = dwSym{s: dwtype, l: d.ldr}
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a.Data = dwSym(dwtype)
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} else {
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d.newrefattr(child, dwarf.DW_AT_type, dwtype)
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}
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@ -791,7 +784,7 @@ func (d *dwctxt2) synthesizeslicetypes(ctxt *Link, die *dwarf.DWDie) {
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continue
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}
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d.copychildren(ctxt, die, prototype)
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elem := getattr(die, dwarf.DW_AT_go_elem).Data.(dwSym).s
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elem := loader.Sym(getattr(die, dwarf.DW_AT_go_elem).Data.(dwSym))
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d.substitutetype(die, "array", d.defptrto(elem))
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}
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}
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@ -834,7 +827,7 @@ func (d *dwctxt2) synthesizemaptypes(ctxt *Link, die *dwarf.DWDie) {
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if die.Abbrev != dwarf.DW_ABRV_MAPTYPE {
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continue
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}
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gotype := getattr(die, dwarf.DW_AT_type).Data.(dwSym).s
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gotype := loader.Sym(getattr(die, dwarf.DW_AT_type).Data.(dwSym))
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keytype := decodetypeMapKey2(d.ldr, d.arch, gotype)
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valtype := decodetypeMapValue2(d.ldr, d.arch, gotype)
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keydata := d.ldr.Data(keytype)
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@ -932,7 +925,7 @@ func (d *dwctxt2) synthesizechantypes(ctxt *Link, die *dwarf.DWDie) {
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if die.Abbrev != dwarf.DW_ABRV_CHANTYPE {
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continue
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}
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elemgotype := getattr(die, dwarf.DW_AT_type).Data.(dwSym).s
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elemgotype := loader.Sym(getattr(die, dwarf.DW_AT_type).Data.(dwSym))
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tname := d.ldr.SymName(elemgotype)
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elemname := tname[5:]
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elemtype := d.walksymtypedef(d.defgotype(d.lookupOrDiag(tname)))
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@ -1200,11 +1193,11 @@ func (d *dwctxt2) mkBuiltinType(ctxt *Link, abrv int, tname string) *dwarf.DWDie
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gotype := d.lookupOrDiag("type." + tname)
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// Map from die sym to type sym
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ds := die.Sym.(dwSym)
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d.rtmap[ds.s] = gotype
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ds := loader.Sym(die.Sym.(dwSym))
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d.rtmap[ds] = gotype
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// Map from type to def sym
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d.tdmap[gotype] = ds.s
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d.tdmap[gotype] = ds
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return die
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}
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@ -1241,7 +1234,7 @@ func dwarfGenerateDebugInfo2(ctxt *Link) {
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newattr(die, dwarf.DW_AT_encoding, dwarf.DW_CLS_CONSTANT, dwarf.DW_ATE_unsigned, 0)
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newattr(die, dwarf.DW_AT_byte_size, dwarf.DW_CLS_CONSTANT, int64(d.arch.PtrSize), 0)
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newattr(die, dwarf.DW_AT_go_kind, dwarf.DW_CLS_CONSTANT, objabi.KindUintptr, 0)
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newattr(die, dwarf.DW_AT_go_runtime_type, dwarf.DW_CLS_ADDRESS, 0, dwSym{s: d.lookupOrDiag("type.uintptr"), l: d.ldr})
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newattr(die, dwarf.DW_AT_go_runtime_type, dwarf.DW_CLS_ADDRESS, 0, dwSym(d.lookupOrDiag("type.uintptr")))
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d.uintptrInfoSym = d.mustFind("uintptr")
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@ -1515,19 +1508,19 @@ func convertSymbolsInDIE(ctxt *Link, die *dwarf.DWDie, convdies map[*dwarf.DWDie
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}
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convdies[die] = true
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if die.Sym != nil {
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symIdx, ok := die.Sym.(dwSym)
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ds, ok := die.Sym.(dwSym)
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if !ok {
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panic("bad die sym field")
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}
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ls := symIdx.s
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if ls == 0 {
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symIdx := loader.Sym(ds)
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if symIdx == 0 {
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panic("zero loader sym for die")
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}
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die.Sym = ctxt.loader.Syms[symIdx.s]
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die.Sym = ctxt.loader.Syms[symIdx]
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}
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for a := die.Attr; a != nil; a = a.Link {
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if attrSym, ok := a.Data.(dwSym); ok {
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a.Data = ctxt.loader.Syms[attrSym.s]
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a.Data = ctxt.loader.Syms[loader.Sym(attrSym)]
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}
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}
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convertSymbolsInDIE(ctxt, die.Child, convdies)
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@ -103,6 +103,10 @@ func (s *Symbol) Len() int64 {
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return s.Size
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}
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func (s *Symbol) Length(dwarfContext interface{}) int64 {
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return s.Size
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}
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|
||||
func (s *Symbol) Grow(siz int64) {
|
||||
if int64(int(siz)) != siz {
|
||||
log.Fatalf("symgrow size %d too long", siz)
|
||||
|
Loading…
Reference in New Issue
Block a user