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cmd/link: add -dumpdep flag to dump linker dependency graph

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This is what led to https://golang.org/cl/20763 and
https://golang.org/cl/20765 to shrink binary sizes.

Change-Id: Id360d474e6153cfe32a525b0a720810fd113195b
Reviewed-on: https://go-review.googlesource.com/22392
Reviewed-by: David Crawshaw <crawshaw@golang.org>
This commit is contained in:
Brad Fitzpatrick 2016-04-22 18:49:59 -07:00
parent 9e3c68f1e0
commit d224e98d9a
3 changed files with 9 additions and 0 deletions
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7
src/cmd/link/internal/ld/deadcode.go
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@ -196,6 +196,13 @@ func (d *deadcodepass) mark(s, parent *LSym) {
if s.Attr.ReflectMethod() { if s.Attr.ReflectMethod() {
d.reflectMethod = true d.reflectMethod = true
} }
if flag_dumpdep {
p := "_"
if parent != nil {
p = parent.Name
}
fmt.Printf("%s -> %s\n", p, s.Name)
}
s.Attr |= AttrReachable s.Attr |= AttrReachable
s.Reachparent = parent s.Reachparent = parent
d.markQueue = append(d.markQueue, s) d.markQueue = append(d.markQueue, s)

1
src/cmd/link/internal/ld/lib.go
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@ -196,6 +196,7 @@ var (
Funcalign int Funcalign int
iscgo bool iscgo bool
elfglobalsymndx int elfglobalsymndx int
flag_dumpdep bool
flag_installsuffix string flag_installsuffix string
flag_race int flag_race int
flag_msan int flag_msan int

1
src/cmd/link/internal/ld/pobj.go
View File

@ -90,6 +90,7 @@ func Ldmain() {
flag.Var(&Buildmode, "buildmode", "set build `mode`") flag.Var(&Buildmode, "buildmode", "set build `mode`")
obj.Flagcount("c", "dump call graph", &Debug['c']) obj.Flagcount("c", "dump call graph", &Debug['c'])
obj.Flagcount("d", "disable dynamic executable", &Debug['d']) obj.Flagcount("d", "disable dynamic executable", &Debug['d'])
flag.BoolVar(&flag_dumpdep, "dumpdep", false, "dump symbol dependency graph")
obj.Flagstr("extar", "archive program for buildmode=c-archive", &extar) obj.Flagstr("extar", "archive program for buildmode=c-archive", &extar)
obj.Flagstr("extld", "use `linker` when linking in external mode", &extld) obj.Flagstr("extld", "use `linker` when linking in external mode", &extld)
obj.Flagstr("extldflags", "pass `flags` to external linker", &extldflags) obj.Flagstr("extldflags", "pass `flags` to external linker", &extldflags)