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