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troop_globals.go
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/
troop_globals.go
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package goof
import (
"debug/dwarf"
"reflect"
"regexp"
"sort"
"strings"
"unsafe"
"github.com/zeebo/errs"
)
var statictmpRe = regexp.MustCompile(`statictmp_\d+$`)
func (t *Troop) addGlobals() error {
reader := t.data.Reader()
for {
entry, err := reader.Next()
if err != nil {
return errs.Wrap(err)
}
if entry == nil {
break
}
if entry.Tag != dwarf.TagVariable {
continue
}
name, ok := entry.Val(dwarf.AttrName).(string)
if !ok {
continue
}
// filter out some values that aren't useful and just clutter stuff
if strings.Contains(name, "·") {
continue
}
if statictmpRe.MatchString(name) {
continue
}
loc, err := entryLocation(t.data, entry)
if err != nil {
continue
}
dtyp, err := entryType(t.data, entry)
if err != nil {
continue
}
dname := dwarfTypeName(dtyp)
if dname == "<unspecified>" || dname == "" {
continue
}
rtyp := t.types[dname]
if rtyp == nil {
continue
}
ptr := unsafe.Pointer(uintptr(loc))
t.globals[name] = reflect.NewAt(rtyp, ptr).Elem()
}
return nil
}
func (t *Troop) Globals() ([]string, error) {
if err := t.check(); err != nil {
return nil, err
}
out := make([]string, 0, len(t.globals))
for name := range t.globals {
out = append(out, name)
}
sort.Strings(out)
return out, nil
}
func (t *Troop) Global(name string) (reflect.Value, error) {
if err := t.check(); err != nil {
return reflect.Value{}, t.err
}
return t.globals[name], nil
}