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cmd/link: do not export plugin C symbols

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Explicitly filter any C-only cgo functions out of pclntable,
which allows them to be duplicated with the host binary.

Updates #18190.

Change-Id: I50d8706777a6133b3e95f696bc0bc586b84faa9e
Reviewed-on: https://go-review.googlesource.com/34199
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
David Crawshaw 2016-12-10 13:30:13 -05:00
parent 901005e8fc
commit 96414ca39f
4 changed files with 77 additions and 5 deletions
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18
src/cmd/link/internal/ld/pcln.go
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@ -154,10 +154,26 @@ func renumberfiles(ctxt *Link, files []*Symbol, d *Pcdata) {
*d = out
}
// onlycsymbol reports whether this is a cgo symbol provided by the
// runtime and only used from C code.
func onlycsymbol(s *Symbol) bool {
switch s.Name {
case "_cgo_topofstack", "_cgo_panic", "crosscall2":
return true
}
return false
}
func container(s *Symbol) int {
if s == nil {
return 0
}
if Buildmode == BuildmodePlugin && onlycsymbol(s) {
return 1
}
// We want to generate func table entries only for the "lowest level" symbols,
// not containers of subsymbols.
if s != nil && s.Type&obj.SCONTAINER != 0 {
if s.Type&obj.SCONTAINER != 0 {
return 1
}
return 0