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cmd/link: -buildmode=plugin support for linux

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This CL contains several linker changes to support creating plugins.

It collects the exported plugin symbols provided by the compiler and
includes them in the moduledata.

It treats a binary as being dynamically linked if it imports the plugin
package. This lets the dynamic linker de-duplicate symbols.

Change-Id: I099b6f38dda26306eba5c41dbe7862f5a5918d95
Reviewed-on: https://go-review.googlesource.com/27820
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
David Crawshaw 2016-08-25 21:58:45 -04:00
parent 79167bbd9c
commit eced6754c2
20 changed files with 119 additions and 49 deletions
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10
src/cmd/link/internal/ld/deadcode.go
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@ -243,6 +243,16 @@ func (d *deadcodepass) init() {
names = append(names, *flagEntrySymbol)
if *FlagLinkshared && (Buildmode == BuildmodeExe || Buildmode == BuildmodePIE) {
names = append(names, "main.main", "main.init")
} else if Buildmode == BuildmodePlugin {
pluginInit := d.ctxt.Library[0].Pkg + ".init"
names = append(names, pluginInit, "go.plugin.tabs")
// We don't keep the go.plugin.exports symbol,
// but we do keep the symbols it refers to.
exports := Linkrlookup(d.ctxt, "go.plugin.exports", 0)
for _, r := range exports.R {
d.mark(r.Sym, nil)
}
}
for _, name := range markextra {
names = append(names, name)