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cmd/link: add notion of multiple compilation units per package

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As we move the debug_line generation into the compiler, we need to
upgrade the notion of compilationUnit to not just be on a per package
basis.  That won't be the case as it will be impossible for all
compilationUnits to have the same set of files names used to build the
debug_lines table. (For example, assembled files in a package don't know
about any files but themselves, so the debug_lines table could only
reference themseves. As such, we need to break the 1:1 relationship
between compUnit and package.)

Change-Id: I2e517bb6c01de0115bbf777af828a2fe59c09ce8
Reviewed-on: https://go-review.googlesource.com/c/go/+/189618
Run-TryBot: Jeremy Faller <jeremy@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Jeremy Faller 2019-08-09 11:36:03 -04:00
parent d979ac33a2
commit 78a3734714
9 changed files with 173 additions and 145 deletions
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5
src/cmd/link/internal/ld/deadcode.go
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@ -126,8 +126,9 @@ func deadcode(ctxt *Link) {
textp := make([]*sym.Symbol, 0, len(ctxt.Textp))
for _, s := range ctxt.Textp {
if s.Attr.Reachable() {
if s.Lib != nil {
s.Lib.Textp = append(s.Lib.Textp, s)
if s.Unit != nil {
s.Unit.Lib.Textp = append(s.Unit.Lib.Textp, s)
s.Unit.Textp = append(s.Unit.Textp, s)
}
textp = append(textp, s)
}