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7fdec6216c
This has a minor performance cost, but far less than is being gained by SSA. As an experiment, enable it during the Go 1.7 beta. Having frame pointers on by default makes Linux's perf, Intel VTune, and other profilers much more useful, because it lets them gather a stack trace efficiently on profiling events. (It doesn't help us that much, since when we walk the stack we usually need to look up PC-specific information as well.) Fixes #15840. Change-Id: I4efd38412a0de4a9c87b1b6e5d11c301e63f1a2a Reviewed-on: https://go-review.googlesource.com/23451 Run-TryBot: Russ Cox <rsc@golang.org> Reviewed-by: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
134 lines
3.6 KiB
Go
134 lines
3.6 KiB
Go
// Derived from Inferno utils/6l/obj.c and utils/6l/span.c
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// http://code.google.com/p/inferno-os/source/browse/utils/6l/obj.c
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// http://code.google.com/p/inferno-os/source/browse/utils/6l/span.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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import (
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"cmd/internal/sys"
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"log"
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"os"
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"path/filepath"
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"strconv"
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)
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var headers = []struct {
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name string
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val int
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}{
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{"darwin", Hdarwin},
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{"dragonfly", Hdragonfly},
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{"freebsd", Hfreebsd},
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{"linux", Hlinux},
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{"android", Hlinux}, // must be after "linux" entry or else headstr(Hlinux) == "android"
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{"nacl", Hnacl},
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{"netbsd", Hnetbsd},
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{"openbsd", Hopenbsd},
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{"plan9", Hplan9},
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{"solaris", Hsolaris},
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{"windows", Hwindows},
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{"windowsgui", Hwindows},
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}
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func headtype(name string) int {
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for i := 0; i < len(headers); i++ {
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if name == headers[i].name {
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return headers[i].val
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}
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}
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return -1
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}
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func Headstr(v int) string {
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for i := 0; i < len(headers); i++ {
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if v == headers[i].val {
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return headers[i].name
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}
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}
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return strconv.Itoa(v)
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}
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func Linknew(arch *LinkArch) *Link {
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ctxt := new(Link)
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ctxt.Hash = make(map[SymVer]*LSym)
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ctxt.Arch = arch
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ctxt.Version = HistVersion
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ctxt.Goroot = Getgoroot()
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ctxt.Goroot_final = os.Getenv("GOROOT_FINAL")
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var buf string
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buf, _ = os.Getwd()
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if buf == "" {
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buf = "/???"
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}
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buf = filepath.ToSlash(buf)
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ctxt.Pathname = buf
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ctxt.LineHist.GOROOT = ctxt.Goroot
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ctxt.LineHist.GOROOT_FINAL = ctxt.Goroot_final
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ctxt.LineHist.Dir = ctxt.Pathname
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ctxt.Headtype = headtype(Getgoos())
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if ctxt.Headtype < 0 {
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log.Fatalf("unknown goos %s", Getgoos())
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}
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// On arm, record goarm.
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if ctxt.Arch.Family == sys.ARM {
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ctxt.Goarm = Getgoarm()
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}
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ctxt.Flag_optimize = true
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ctxt.Framepointer_enabled = Framepointer_enabled(Getgoos(), arch.Name)
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return ctxt
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}
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func Linklookup(ctxt *Link, name string, v int) *LSym {
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s := ctxt.Hash[SymVer{name, v}]
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if s != nil {
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return s
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}
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s = &LSym{
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Name: name,
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Type: 0,
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Version: int16(v),
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Size: 0,
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}
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ctxt.Hash[SymVer{name, v}] = s
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return s
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}
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func Linksymfmt(s *LSym) string {
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if s == nil {
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return "<nil>"
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}
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return s.Name
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}
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