qbit/go
1
0
Fork 0
mirror of https://github.com/golang/go synced 2024-11-18 10:24:42 -07:00
Code Releases Activity

cmd/compile: generate table of main symbol types

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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