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https://github.com/cwinfo/matterbridge.git
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Add gops agent
This commit is contained in:
Wim
217
vendor/github.com/google/gops/internal/obj/pass.go
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vendored
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217
vendor/github.com/google/gops/internal/obj/pass.go
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// Inferno utils/6l/pass.c
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// https://bitbucket.org/inferno-os/inferno-os/src/default/utils/6l/pass.c
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//
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// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
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// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
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// Portions Copyright © 1997-1999 Vita Nuova Limited
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// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
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// Portions Copyright © 2004,2006 Bruce Ellis
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// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
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// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
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// Portions Copyright © 2009 The Go Authors. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package obj
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// Code and data passes.
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func Brchain(ctxt *Link, p *Prog) *Prog {
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for i := 0; i < 20; i++ {
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if p == nil || p.As != AJMP || p.Pcond == nil {
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return p
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}
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p = p.Pcond
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}
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return nil
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}
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func brloop(ctxt *Link, p *Prog) *Prog {
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var q *Prog
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c := 0
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for q = p; q != nil; q = q.Pcond {
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if q.As != AJMP || q.Pcond == nil {
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break
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}
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c++
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if c >= 5000 {
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return nil
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}
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}
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return q
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}
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func checkaddr(ctxt *Link, p *Prog, a *Addr) {
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// Check expected encoding, especially TYPE_CONST vs TYPE_ADDR.
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switch a.Type {
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case TYPE_NONE:
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return
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case TYPE_BRANCH:
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if a.Reg != 0 || a.Index != 0 || a.Scale != 0 || a.Name != 0 {
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break
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}
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return
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case TYPE_TEXTSIZE:
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if a.Reg != 0 || a.Index != 0 || a.Scale != 0 || a.Name != 0 {
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break
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}
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return
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//if(a->u.bits != 0)
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// break;
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case TYPE_MEM:
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return
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// TODO(rsc): After fixing SHRQ, check a->index != 0 too.
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case TYPE_CONST:
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if a.Name != 0 || a.Sym != nil || a.Reg != 0 {
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ctxt.Diag("argument is TYPE_CONST, should be TYPE_ADDR, in %v", p)
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return
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}
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if a.Reg != 0 || a.Scale != 0 || a.Name != 0 || a.Sym != nil || a.Val != nil {
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break
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}
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return
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case TYPE_FCONST, TYPE_SCONST:
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if a.Reg != 0 || a.Index != 0 || a.Scale != 0 || a.Name != 0 || a.Offset != 0 || a.Sym != nil {
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break
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}
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return
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// TODO(rsc): After fixing PINSRQ, check a->offset != 0 too.
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// TODO(rsc): After fixing SHRQ, check a->index != 0 too.
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case TYPE_REG:
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if a.Scale != 0 || a.Name != 0 || a.Sym != nil {
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break
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}
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return
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case TYPE_ADDR:
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if a.Val != nil {
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break
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}
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if a.Reg == 0 && a.Index == 0 && a.Scale == 0 && a.Name == 0 && a.Sym == nil {
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ctxt.Diag("argument is TYPE_ADDR, should be TYPE_CONST, in %v", p)
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}
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return
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case TYPE_SHIFT:
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if a.Index != 0 || a.Scale != 0 || a.Name != 0 || a.Sym != nil || a.Val != nil {
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break
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}
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return
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case TYPE_REGREG:
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if a.Index != 0 || a.Scale != 0 || a.Name != 0 || a.Sym != nil || a.Val != nil {
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break
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}
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return
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case TYPE_REGREG2:
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return
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case TYPE_REGLIST:
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return
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// Expect sym and name to be set, nothing else.
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// Technically more is allowed, but this is only used for *name(SB).
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case TYPE_INDIR:
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if a.Reg != 0 || a.Index != 0 || a.Scale != 0 || a.Name == 0 || a.Offset != 0 || a.Sym == nil || a.Val != nil {
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break
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}
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return
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}
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ctxt.Diag("invalid encoding for argument %v", p)
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}
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func linkpatch(ctxt *Link, sym *LSym) {
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var c int32
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var name string
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var q *Prog
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ctxt.Cursym = sym
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for p := sym.Text; p != nil; p = p.Link {
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checkaddr(ctxt, p, &p.From)
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if p.From3 != nil {
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checkaddr(ctxt, p, p.From3)
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}
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checkaddr(ctxt, p, &p.To)
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if ctxt.Arch.Progedit != nil {
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ctxt.Arch.Progedit(ctxt, p)
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}
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if p.To.Type != TYPE_BRANCH {
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continue
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}
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if p.To.Val != nil {
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// TODO: Remove To.Val.(*Prog) in favor of p->pcond.
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p.Pcond = p.To.Val.(*Prog)
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continue
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}
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if p.To.Sym != nil {
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continue
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}
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c = int32(p.To.Offset)
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for q = sym.Text; q != nil; {
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if int64(c) == q.Pc {
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break
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}
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if q.Forwd != nil && int64(c) >= q.Forwd.Pc {
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q = q.Forwd
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} else {
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q = q.Link
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}
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}
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if q == nil {
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name = "<nil>"
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if p.To.Sym != nil {
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name = p.To.Sym.Name
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}
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ctxt.Diag("branch out of range (%#x)\n%v [%s]", uint32(c), p, name)
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p.To.Type = TYPE_NONE
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}
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p.To.Val = q
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p.Pcond = q
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}
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if ctxt.Flag_optimize {
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for p := sym.Text; p != nil; p = p.Link {
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if p.Pcond != nil {
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p.Pcond = brloop(ctxt, p.Pcond)
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if p.Pcond != nil {
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if p.To.Type == TYPE_BRANCH {
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p.To.Offset = p.Pcond.Pc
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}
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}
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}
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}
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}
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}
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