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godwarf: Attempt to load DW_AT_specification if present (#3247)

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This commit is contained in:
Frederic Branczyk
2023-01-05 18:45:55 +01:00
committed by GitHub
parent 62335703d2
commit 9c44954860
1 changed files with 24 additions and 10 deletions
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34
pkg/dwarf/godwarf/tree.go
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@ -24,11 +24,13 @@ func (ce compositeEntry) Val(attr dwarf.Attr) interface{} {
return nil
}
// LoadAbstractOrigin loads the entry corresponding to the
// DW_AT_abstract_origin of entry and returns a combination of entry and its
// abstract origin.
func LoadAbstractOrigin(entry *dwarf.Entry, aordr *dwarf.Reader) (Entry, dwarf.Offset) {
ao, ok := entry.Val(dwarf.AttrAbstractOrigin).(dwarf.Offset)
// LoadAbstractOriginAndSpecification loads the entry corresponding to the
// DW_AT_abstract_origin and/or DW_AT_specification of entry and returns a
// combination of entry and its abstract origin. If a DIE has both a
// specification and an abstract origin the specification will be ignored, the
// DWARF standard is unclear on how this should be handled
func LoadAbstractOriginAndSpecification(entry *dwarf.Entry, aordr *dwarf.Reader) (Entry, dwarf.Offset) {
ao, ok := getAbstractOriginOrSpecification(entry)
if !ok {
return entry, entry.Offset
}
@ -43,7 +45,7 @@ func LoadAbstractOrigin(entry *dwarf.Entry, aordr *dwarf.Reader) (Entry, dwarf.O
}
r = append(r, e)
ao, ok = e.Val(dwarf.AttrAbstractOrigin).(dwarf.Offset)
ao, ok = getAbstractOriginOrSpecification(e)
if !ok {
break
}
@ -52,6 +54,18 @@ func LoadAbstractOrigin(entry *dwarf.Entry, aordr *dwarf.Reader) (Entry, dwarf.O
return compositeEntry(r), entry.Offset
}
func getAbstractOriginOrSpecification(e *dwarf.Entry) (dwarf.Offset, bool) {
ao, ok := e.Val(dwarf.AttrAbstractOrigin).(dwarf.Offset)
if ok {
return ao, true
}
sp, ok := e.Val(dwarf.AttrSpecification).(dwarf.Offset)
if ok {
return sp, true
}
return dwarf.Offset(0), false
}
// Tree represents a tree of dwarf objects.
type Tree struct {
Entry
@ -85,7 +99,7 @@ func LoadTree(off dwarf.Offset, dw *dwarf.Data, staticBase uint64) (*Tree, error
if err != nil {
return nil, err
}
r.resolveAbstractEntries(rdr)
r.resolveAbstractAndSpecificationEntries(rdr)
return r, nil
}
@ -228,10 +242,10 @@ func rangeContains(a, b [2]uint64) bool {
return a[0] <= b[0] && a[1] >= b[1]
}
func (n *Tree) resolveAbstractEntries(rdr *dwarf.Reader) {
n.Entry, n.Offset = LoadAbstractOrigin(n.Entry.(*dwarf.Entry), rdr)
func (n *Tree) resolveAbstractAndSpecificationEntries(rdr *dwarf.Reader) {
n.Entry, n.Offset = LoadAbstractOriginAndSpecification(n.Entry.(*dwarf.Entry), rdr)
for _, child := range n.Children {
child.resolveAbstractEntries(rdr)
child.resolveAbstractAndSpecificationEntries(rdr)
}
}