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cmd/compile: generate table of main symbol types

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For each exported symbol in package main, add its name and type to
go.plugin.tabs symbol. This is used by the runtime when loading a
plugin to return a typed interface{} value.

Change-Id: I23c39583e57180acb8f7a74d218dae4368614f46
Reviewed-on: https://go-review.googlesource.com/27818
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 2016-08-25 20:29:15 -04:00
parent 6e703ae709
commit 5923df1af9
2 changed files with 61 additions and 0 deletions
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30
src/cmd/compile/internal/gc/obj.go
View File

@ -130,6 +130,7 @@ func dumpobj1(outfile string, mode int) {
externs := len(externdcl) externs := len(externdcl)
dumpglobls() dumpglobls()
dumpptabs()
dumptypestructs() dumptypestructs()
// Dump extra globals. // Dump extra globals.
@ -163,6 +164,35 @@ func dumpobj1(outfile string, mode int) {
bout.Close() bout.Close()
} }
func dumpptabs() {
if !Ctxt.Flag_dynlink || localpkg.Name != "main" {
return
}
for _, exportn := range exportlist {
s := exportn.Sym
n := s.Def
if n == nil {
continue
}
if n.Op != ONAME {
continue
}
if !exportname(s.Name) {
continue
}
if s.Pkg.Name != "main" {
continue
}
if n.Type.Etype == TFUNC && n.Class == PFUNC {
// function
ptabs = append(ptabs, ptabEntry{s: s, t: s.Def.Type})
} else {
// variable
ptabs = append(ptabs, ptabEntry{s: s, t: typPtr(s.Def.Type)})
}
}
}
func dumpglobls() { func dumpglobls() {
// add globals // add globals
for _, n := range externdcl { for _, n := range externdcl {

31
src/cmd/compile/internal/gc/reflect.go
View File

@ -18,9 +18,15 @@ type itabEntry struct {
sym *Sym sym *Sym
} }
type ptabEntry struct {
s *Sym
t *Type
}
// runtime interface and reflection data structures // runtime interface and reflection data structures
var signatlist []*Node var signatlist []*Node
var itabs []itabEntry var itabs []itabEntry
var ptabs []ptabEntry
type Sig struct { type Sig struct {
name string name string
@ -1405,6 +1411,31 @@ func dumptypestructs() {
ggloblsym(ilink, int32(Widthptr), int16(obj.DUPOK|obj.RODATA)) ggloblsym(ilink, int32(Widthptr), int16(obj.DUPOK|obj.RODATA))
} }
// process ptabs
if localpkg.Name == "main" && len(ptabs) > 0 {
ot := 0
s := obj.Linklookup(Ctxt, "go.plugin.tabs", 0)
for _, p := range ptabs {
// Dump ptab symbol into go.pluginsym package.
//
// type ptab struct {
// name nameOff
// typ typeOff // pointer to symbol
// }
nsym := dname(p.s.Name, "", nil, true)
ot = dsymptrOffLSym(s, ot, nsym, 0)
ot = dsymptrOffLSym(s, ot, Linksym(typesym(p.t)), 0)
}
ggloblLSym(s, int32(ot), int16(obj.RODATA))
ot = 0
s = obj.Linklookup(Ctxt, "go.plugin.exports", 0)
for _, p := range ptabs {
ot = dsymptrLSym(s, ot, Linksym(p.s), 0)
}
ggloblLSym(s, int32(ot), int16(obj.RODATA))
}
// generate import strings for imported packages // generate import strings for imported packages
if forceObjFileStability { if forceObjFileStability {
// Sorting the packages is not necessary but to compare binaries created // Sorting the packages is not necessary but to compare binaries created