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// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package runtime
import "unsafe"
//go:linkname plugin_lastmoduleinit plugin.lastmoduleinit
func plugin_lastmoduleinit() map[string]interface{} {
md := firstmoduledata.next
if md == nil {
throw("runtime: no plugin module data")
}
for md.next != nil {
md = md.next
}
if md.typemap != nil {
throw("runtime: plugin already initialized")
}
// Initialize the freshly loaded module.
typelinksinit()
md.gcdatamask = progToPointerMask((*byte)(unsafe.Pointer(md.gcdata)), md.edata-md.data)
md.gcbssmask = progToPointerMask((*byte)(unsafe.Pointer(md.gcbss)), md.ebss-md.bss)
lock(&ifaceLock)
for _, i := range md.itablinks {
additab(i, true, false)
}
unlock(&ifaceLock)
// Build a map of symbol names to symbols. Here in the runtime
// we fill out the first word of the interface, the type. We
// pass these zero value interfaces to the plugin package,
// where the symbol value is filled in (usually via cgo).
//
// Because functions are handled specially in the plugin package,
// function symbol names are prefixed here with '.' to avoid
// a dependency on the reflect package.
syms := make(map[string]interface{}, len(md.ptab))
for _, ptab := range md.ptab {
symName := resolveNameOff(unsafe.Pointer(md.types), ptab.name)
t := (*_type)(unsafe.Pointer(md.types)).typeOff(ptab.typ)
var val interface{}
valp := (*[2]unsafe.Pointer)(unsafe.Pointer(&val))
(*valp)[0] = unsafe.Pointer(t)
name := symName.name()
if t.kind&kindMask == kindFunc {
name = "." + name
}
syms[name] = val
}
return syms
}
// A ptabEntry is generated by the compiler for each exported function
// and global variable in the main package of a plugin. It is used to
// initialize the plugin module's symbol map.
type ptabEntry struct {
name nameOff
typ typeOff
}
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