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cmd/link: always mark runtime.unreachableMethod symbol

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In the deadcode path we mark runtime.unreachableMethod symbol,
which is a special symbol used for redirecting unreachable
methods. Currently this code is conditioned on not -linkshared.
This is wrong. It should be marked with -linkshared mode as well.

In fact, -linkshared should only affect the entry symbol. Change
the code accordingly.

Change-Id: I252abf850212a930f275589ef0035a43e52cb9cc
Reviewed-on: https://go-review.googlesource.com/c/go/+/319893
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
This commit is contained in:
Cherry Mui 2021-05-13 16:48:50 -04:00
parent 92c189f211
commit b4833f7c06
1 changed files with 19 additions and 19 deletions
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38
src/cmd/link/internal/ld/deadcode.go
View file

@ -65,26 +65,26 @@ func (d *deadcodePass) init() {
}
}
names = append(names, *flagEntrySymbol)
// runtime.unreachableMethod is a function that will throw if called.
// We redirect unreachable methods to it.
names = append(names, "runtime.unreachableMethod")
if !d.ctxt.linkShared && d.ctxt.BuildMode != BuildModePlugin {
// runtime.buildVersion and runtime.modinfo are referenced in .go.buildinfo section
// (see function buildinfo in data.go). They should normally be reachable from the
// runtime. Just make it explicit, in case.
names = append(names, "runtime.buildVersion", "runtime.modinfo")
}
if d.ctxt.BuildMode == BuildModePlugin {
names = append(names, objabi.PathToPrefix(*flagPluginPath)+"..inittask", objabi.PathToPrefix(*flagPluginPath)+".main", "go.plugin.tabs")
}
// runtime.unreachableMethod is a function that will throw if called.
// We redirect unreachable methods to it.
names = append(names, "runtime.unreachableMethod")
if !d.ctxt.linkShared && d.ctxt.BuildMode != BuildModePlugin {
// runtime.buildVersion and runtime.modinfo are referenced in .go.buildinfo section
// (see function buildinfo in data.go). They should normally be reachable from the
// runtime. Just make it explicit, in case.
names = append(names, "runtime.buildVersion", "runtime.modinfo")
}
if d.ctxt.BuildMode == BuildModePlugin {
names = append(names, objabi.PathToPrefix(*flagPluginPath)+"..inittask", objabi.PathToPrefix(*flagPluginPath)+".main", "go.plugin.tabs")
// We don't keep the go.plugin.exports symbol,
// but we do keep the symbols it refers to.
exportsIdx := d.ldr.Lookup("go.plugin.exports", 0)
if exportsIdx != 0 {
relocs := d.ldr.Relocs(exportsIdx)
for i := 0; i < relocs.Count(); i++ {
d.mark(relocs.At(i).Sym(), 0)
}
// We don't keep the go.plugin.exports symbol,
// but we do keep the symbols it refers to.
exportsIdx := d.ldr.Lookup("go.plugin.exports", 0)
if exportsIdx != 0 {
relocs := d.ldr.Relocs(exportsIdx)
for i := 0; i < relocs.Count(); i++ {
d.mark(relocs.At(i).Sym(), 0)
}
}
}