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cmd/compile, etc: use name for type pkgPath

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By replacing the *string used to represent pkgPath with a
reflect.name everywhere, the embedded *string for package paths
inside the reflect.name can be replaced by an offset, nameOff.
This reduces the number of pointers in the type information.

This also moves all reflect.name types into the same section, making
it possible to use nameOff more widely in later CLs.

No significant binary size change for normal binaries, but:

linux/amd64 PIE:
	cmd/go: -440KB (3.7%)
	jujud:  -2.6MB (3.2%)

For #6853.

Change-Id: I3890b132a784a1090b1b72b32febfe0bea77eaee
Reviewed-on: https://go-review.googlesource.com/21395
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 2016-03-31 10:02:10 -04:00
parent 73e2ad2022
commit f120936dff
7 changed files with 169 additions and 114 deletions
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13
src/cmd/internal/obj/data.go
View file

@ -75,7 +75,11 @@ func (s *LSym) prepwrite(ctxt *Link, off int64, siz int) {
if s.Type == SBSS || s.Type == STLSBSS {
ctxt.Diag("cannot supply data for BSS var")
}
s.Grow(off + int64(siz))
l := off + int64(siz)
s.Grow(l)
if l > s.Size {
s.Size = l
}
}
// WriteFloat32 writes f into s at offset off.
@ -150,6 +154,13 @@ func (s *LSym) WriteString(ctxt *Link, off int64, siz int, str string) {
copy(s.P[off:off+int64(siz)], str)
}
// WriteBytes writes a slice of bytes into s at offset off.
func (s *LSym) WriteBytes(ctxt *Link, off int64, b []byte) int64 {
s.prepwrite(ctxt, off, len(b))
copy(s.P[off:], b)
return off + int64(len(b))
}
func Addrel(s *LSym) *Reloc {
s.R = append(s.R, Reloc{})
return &s.R[len(s.R)-1]