/
types.go
208 lines (177 loc) · 6.48 KB
/
types.go
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package proc
import (
"debug/dwarf"
"errors"
"fmt"
"go/constant"
"reflect"
"github.com/go-delve/delve/pkg/dwarf/godwarf"
"github.com/go-delve/delve/pkg/dwarf/reader"
)
// The kind field in runtime._type is a reflect.Kind value plus
// some extra flags defined here.
// See equivalent declaration in $GOROOT/src/reflect/type.go
const (
kindDirectIface = 1 << 5 // +rtype kindDirectIface
kindGCProg = 1 << 6 // +rtype kindGCProg
kindNoPointers = 1 << 7
kindMask = (1 << 5) - 1 // +rtype kindMask
)
type runtimeTypeDIE struct {
offset dwarf.Offset
kind int64
}
func pointerTo(typ godwarf.Type, arch *Arch) godwarf.Type {
return &godwarf.PtrType{
CommonType: godwarf.CommonType{
ByteSize: int64(arch.PtrSize()),
Name: "*" + typ.Common().Name,
ReflectKind: reflect.Ptr,
Offset: 0,
},
Type: typ,
}
}
type functionsDebugInfoByEntry []Function
func (v functionsDebugInfoByEntry) Len() int { return len(v) }
func (v functionsDebugInfoByEntry) Less(i, j int) bool { return v[i].Entry < v[j].Entry }
func (v functionsDebugInfoByEntry) Swap(i, j int) { v[i], v[j] = v[j], v[i] }
type compileUnitsByOffset []*compileUnit
func (v compileUnitsByOffset) Len() int { return len(v) }
func (v compileUnitsByOffset) Less(i int, j int) bool { return v[i].offset < v[j].offset }
func (v compileUnitsByOffset) Swap(i int, j int) { v[i], v[j] = v[j], v[i] }
type packageVarsByAddr []packageVar
func (v packageVarsByAddr) Len() int { return len(v) }
func (v packageVarsByAddr) Less(i int, j int) bool { return v[i].addr < v[j].addr }
func (v packageVarsByAddr) Swap(i int, j int) { v[i], v[j] = v[j], v[i] }
type loadDebugInfoMapsContext struct {
ardr *reader.Reader
abstractOriginTable map[dwarf.Offset]int
knownPackageVars map[string]struct{}
offsetToVersion map[dwarf.Offset]uint8
}
func newLoadDebugInfoMapsContext(bi *BinaryInfo, image *Image, offsetToVersion map[dwarf.Offset]uint8) *loadDebugInfoMapsContext {
ctxt := &loadDebugInfoMapsContext{}
ctxt.ardr = image.DwarfReader()
ctxt.abstractOriginTable = make(map[dwarf.Offset]int)
ctxt.offsetToVersion = offsetToVersion
ctxt.knownPackageVars = map[string]struct{}{}
for _, v := range bi.packageVars {
ctxt.knownPackageVars[v.name] = struct{}{}
}
return ctxt
}
func (ctxt *loadDebugInfoMapsContext) lookupAbstractOrigin(bi *BinaryInfo, off dwarf.Offset) int {
r, ok := ctxt.abstractOriginTable[off]
if !ok {
bi.Functions = append(bi.Functions, Function{})
r = len(bi.Functions) - 1
bi.Functions[r].offset = off
ctxt.abstractOriginTable[off] = r
}
return r
}
// runtimeTypeToDIE returns the DIE corresponding to the runtime._type.
// This is done in three different ways depending on the version of go.
// - Before go1.7 the type name is retrieved directly from the runtime._type
// and looked up in debug_info
// - After go1.7 the runtime._type struct is read recursively to reconstruct
// the name of the type, and then the type's name is used to look up
// debug_info
// - After go1.11 the runtimeTypeToDIE map is used to look up the address of
// the type and map it directly to a DIE.
func runtimeTypeToDIE(_type *Variable, dataAddr uint64) (typ godwarf.Type, kind int64, err error) {
bi := _type.bi
_type = _type.maybeDereference()
// go 1.11 implementation: use extended attribute in debug_info
mds, err := loadModuleData(bi, _type.mem)
if err != nil {
return nil, 0, fmt.Errorf("error loading module data: %v", err)
}
md := findModuleDataForType(bi, mds, _type.Addr, _type.mem)
if md != nil {
so := bi.moduleDataToImage(md)
if so != nil {
if rtdie, ok := so.runtimeTypeToDIE[_type.Addr-md.types]; ok {
typ, err := godwarf.ReadType(so.dwarf, so.index, rtdie.offset, so.typeCache)
if err != nil {
return nil, 0, fmt.Errorf("invalid interface type: %v", err)
}
if rtdie.kind == -1 {
if kindField := _type.loadFieldNamed("kind"); kindField != nil && kindField.Value != nil {
rtdie.kind, _ = constant.Int64Val(kindField.Value)
} else if kindField := _type.loadFieldNamed("Kind_"); kindField != nil && kindField.Value != nil {
rtdie.kind, _ = constant.Int64Val(kindField.Value)
}
}
return typ, rtdie.kind, nil
}
}
}
return nil, 0, fmt.Errorf("could not resolve interface type")
}
// resolveParametricType returns the real type of t if t is a parametric
// type, by reading the correct dictionary entry.
func resolveParametricType(bi *BinaryInfo, mem MemoryReadWriter, t godwarf.Type, dictAddr uint64) (godwarf.Type, error) {
ptyp, _ := t.(*godwarf.ParametricType)
if ptyp == nil {
return t, nil
}
if dictAddr == 0 {
return ptyp.TypedefType.Type, errors.New("parametric type without a dictionary")
}
rtypeAddr, err := readUintRaw(mem, dictAddr+uint64(ptyp.DictIndex*int64(bi.Arch.PtrSize())), int64(bi.Arch.PtrSize()))
if err != nil {
return ptyp.TypedefType.Type, err
}
runtimeType, err := bi.findType(bi.runtimeTypeTypename())
if err != nil {
return ptyp.TypedefType.Type, err
}
_type := newVariable("", rtypeAddr, runtimeType, bi, mem)
typ, _, err := runtimeTypeToDIE(_type, 0)
if err != nil {
return ptyp.TypedefType.Type, err
}
return typ, nil
}
func dwarfToRuntimeType(bi *BinaryInfo, mem MemoryReadWriter, typ godwarf.Type) (typeAddr uint64, typeKind uint64, found bool, err error) {
so := bi.typeToImage(typ)
rdr := so.DwarfReader()
rdr.Seek(typ.Common().Offset)
e, err := rdr.Next()
if err != nil {
return 0, 0, false, err
}
off, ok := e.Val(godwarf.AttrGoRuntimeType).(uint64)
if !ok {
return 0, 0, false, nil
}
mds, err := loadModuleData(bi, mem)
if err != nil {
return 0, 0, false, err
}
md := bi.imageToModuleData(so, mds)
if md == nil {
if so.index > 0 {
return 0, 0, false, fmt.Errorf("could not find module data for type %s (shared object: %q)", typ, so.Path)
} else {
return 0, 0, false, fmt.Errorf("could not find module data for type %s", typ)
}
}
typeAddr = md.types + off
rtyp, err := bi.findType(bi.runtimeTypeTypename())
if err != nil {
return 0, 0, false, err
}
_type := newVariable("", typeAddr, rtyp, bi, mem)
kindv := _type.loadFieldNamed("kind")
if kindv == nil || kindv.Unreadable != nil || kindv.Kind != reflect.Uint {
kindv = _type.loadFieldNamed("Kind_")
}
if kindv == nil || kindv.Unreadable != nil || kindv.Kind != reflect.Uint {
return 0, 0, false, fmt.Errorf("unreadable interface type: %v", kindv.Unreadable)
}
typeKind, _ = constant.Uint64Val(kindv.Value)
return typeAddr, typeKind, true, nil
}