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proc: drop support for reading interfaces in Go <= 1.6 (#1501)

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Go 1.6 is now unsupported by the Go team and 3 years old and
runtimeTypeToDIE can use some simplification.
This commit is contained in:
Alessandro Arzilli
2019-02-26 17:49:03 +01:00
committed by Derek Parker
parent 38abe66ce1
commit b9c842b456
1 changed files with 0 additions and 38 deletions
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38
pkg/proc/types.go
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@ -8,7 +8,6 @@ import (
"fmt"
"go/ast"
"go/constant"
"go/parser"
"go/token"
"path/filepath"
"reflect"
@ -566,45 +565,8 @@ func (bi *BinaryInfo) registerRuntimeTypeToDIE(entry *dwarf.Entry, ardr *reader.
// * After go1.11 the runtimeTypeToDIE map is used to look up the address of
// the type and map it drectly to a DIE.
func runtimeTypeToDIE(_type *Variable, dataAddr uintptr) (typ godwarf.Type, kind int64, err error) {
var go17 bool
var typestring *Variable
bi := _type.bi
// Determine if we are in go1.7 or later
typestring, err = _type.structMember("_string")
if err == nil {
typestring = typestring.maybeDereference()
} else {
err = nil
go17 = true
}
if !go17 {
// pre-go1.7 compatibility
if typestring == nil || typestring.Addr == 0 || typestring.Kind != reflect.String {
return nil, 0, fmt.Errorf("invalid interface type")
}
typestring.loadValue(LoadConfig{false, 0, 512, 0, 0, 0})
if typestring.Unreadable != nil {
return nil, 0, fmt.Errorf("invalid interface type: %v", typestring.Unreadable)
}
typename := constant.StringVal(typestring.Value)
t, err := parser.ParseExpr(typename)
if err != nil {
return nil, 0, fmt.Errorf("invalid interface type, unparsable data type: %v", err)
}
typ, err := bi.findTypeExpr(t)
if err != nil {
return nil, 0, fmt.Errorf("interface type %q not found for %#x: %v", typename, dataAddr, err)
}
return typ, 0, nil
}
_type = _type.maybeDereference()
// go 1.11 implementation: use extended attribute in debug_info