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godwarf: Allow extracting a DWARF entry's field (#3258)

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Previously it was only possible to extract a value of type `any` using
an attribute name. This poses challenges when fields are allowed to have
different classes, and it is ambiguous how to handle them.
This commit is contained in:
Frederic Branczyk
2023-01-31 17:40:19 +01:00
committed by GitHub
parent 011fe673fe
commit 436fed8ec4
2 changed files with 24 additions and 8 deletions
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12
pkg/dwarf/godwarf/tree.go
View File

@ -11,14 +11,22 @@ import (
// entry specified by DW_AT_abstract_origin will be searched recursively.
type Entry interface {
Val(dwarf.Attr) interface{}
AttrField(dwarf.Attr) *dwarf.Field
}
type compositeEntry []*dwarf.Entry
func (ce compositeEntry) Val(attr dwarf.Attr) interface{} {
if f := ce.AttrField(attr); f != nil {
return f.Val
}
return nil
}
func (ce compositeEntry) AttrField(a dwarf.Attr) *dwarf.Field {
for _, e := range ce {
if r := e.Val(attr); r != nil {
return r
if f := e.AttrField(a); f != nil {
return f
}
}
return nil

20
pkg/proc/fncall.go
View File

@ -1248,9 +1248,17 @@ func debugCallProtocolReg(archName string, version int) (uint64, bool) {
}
}
type fakeEntry map[dwarf.Attr]interface{}
type fakeEntry map[dwarf.Attr]*dwarf.Field
func (e fakeEntry) Val(attr dwarf.Attr) interface{} {
if e[attr] == nil {
return nil
}
return e[attr].Val
}
func (e fakeEntry) AttrField(attr dwarf.Attr) *dwarf.Field {
return e[attr]
}
@ -1273,11 +1281,11 @@ func regabiMallocgcWorkaround(bi *BinaryInfo) ([]*godwarf.Tree, error) {
if err1 != nil {
return nil
}
var e fakeEntry = map[dwarf.Attr]interface{}{
dwarf.AttrName: name,
dwarf.AttrType: typ.Common().Offset,
dwarf.AttrLocation: []byte{byte(op.DW_OP_reg0) + byte(reg)},
dwarf.AttrVarParam: isret,
var e fakeEntry = map[dwarf.Attr]*dwarf.Field{
dwarf.AttrName: &dwarf.Field{Attr: dwarf.AttrName, Val: name, Class: dwarf.ClassString},
dwarf.AttrType: &dwarf.Field{Attr: dwarf.AttrType, Val: typ.Common().Offset, Class: dwarf.ClassReference},
dwarf.AttrLocation: &dwarf.Field{Attr: dwarf.AttrLocation, Val: []byte{byte(op.DW_OP_reg0) + byte(reg)}, Class: dwarf.ClassBlock},
dwarf.AttrVarParam: &dwarf.Field{Attr: dwarf.AttrVarParam, Val: isret, Class: dwarf.ClassFlag},
}
return &godwarf.Tree{