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cmd/link: don't emit default entry symbol in some situations

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Also, fix comment.

Change-Id: Ieb7ba21f34730dc51ab45a652d225e4145d4b861
Reviewed-on: https://go-review.googlesource.com/54870
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Hiroshi Ioka 2017-06-21 18:35:38 +09:00 committed by Ian Lance Taylor
parent d03b89bd41
commit 6424c40c22
1 changed files with 21 additions and 10 deletions
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31
src/cmd/link/internal/ld/deadcode.go
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@ -215,18 +215,29 @@ func (d *deadcodepass) init() {
} else {
// In a normal binary, start at main.main and the init
// functions and mark what is reachable from there.
names = append(names, *flagEntrySymbol)
if *FlagLinkshared && (Buildmode == BuildmodeExe || Buildmode == BuildmodePIE) {
names = append(names, "main.main", "main.init")
} else if Buildmode == BuildmodePlugin {
names = append(names, *flagPluginPath+".init", *flagPluginPath+".main", "go.plugin.tabs")
} else {
// The external linker refers main symbol directly.
if Linkmode == LinkExternal && (Buildmode == BuildmodeExe || Buildmode == BuildmodePIE) {
if Headtype == objabi.Hwindows && SysArch.Family == sys.I386 {
*flagEntrySymbol = "_main"
} else {
*flagEntrySymbol = "main"
}
}
names = append(names, *flagEntrySymbol)
if Buildmode == BuildmodePlugin {
names = append(names, *flagPluginPath+".init", *flagPluginPath+".main", "go.plugin.tabs")
// We don't keep the go.plugin.exports symbol,
// but we do keep the symbols it refers to.
exports := d.ctxt.Syms.ROLookup("go.plugin.exports", 0)
if exports != nil {
for _, r := range exports.R {
d.mark(r.Sym, nil)
// We don't keep the go.plugin.exports symbol,
// but we do keep the symbols it refers to.
exports := d.ctxt.Syms.ROLookup("go.plugin.exports", 0)
if exports != nil {
for _, r := range exports.R {
d.mark(r.Sym, nil)
}
}
}
}
@ -240,7 +251,7 @@ func (d *deadcodepass) init() {
}
}
// flood flood fills symbols reachable from the markQueue symbols.
// flood fills symbols reachable from the markQueue symbols.
// As it goes, it collects methodref and interface method declarations.
func (d *deadcodepass) flood() {
for len(d.markQueue) > 0 {