forked from lug/matterbridge
87 lines
1.5 KiB
Go
87 lines
1.5 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package obj
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import (
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"fmt"
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"os"
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"strings"
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)
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// go-specific code shared across loaders (5l, 6l, 8l).
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var (
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framepointer_enabled int
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Fieldtrack_enabled int
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)
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// Toolchain experiments.
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// These are controlled by the GOEXPERIMENT environment
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// variable recorded when the toolchain is built.
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// This list is also known to cmd/gc.
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var exper = []struct {
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name string
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val *int
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}{
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{"fieldtrack", &Fieldtrack_enabled},
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{"framepointer", &framepointer_enabled},
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}
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func addexp(s string) {
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// Could do general integer parsing here, but the runtime copy doesn't yet.
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v := 1
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name := s
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if len(name) > 2 && name[:2] == "no" {
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v = 0
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name = name[2:]
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}
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for i := 0; i < len(exper); i++ {
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if exper[i].name == name {
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if exper[i].val != nil {
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*exper[i].val = v
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}
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return
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}
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}
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fmt.Printf("unknown experiment %s\n", s)
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os.Exit(2)
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}
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func init() {
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framepointer_enabled = 1 // default
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for _, f := range strings.Split(goexperiment, ",") {
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if f != "" {
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addexp(f)
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}
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}
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}
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func Framepointer_enabled(goos, goarch string) bool {
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return framepointer_enabled != 0 && goarch == "amd64" && goos != "nacl"
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}
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func Nopout(p *Prog) {
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p.As = ANOP
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p.Scond = 0
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p.From = Addr{}
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p.From3 = nil
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p.Reg = 0
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p.To = Addr{}
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}
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func Expstring() string {
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buf := "X"
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for i := range exper {
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if *exper[i].val != 0 {
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buf += "," + exper[i].name
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}
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}
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if buf == "X" {
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buf += ",none"
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}
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return "X:" + buf[2:]
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}
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