/
any.go
412 lines (396 loc) · 9.91 KB
/
any.go
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package prog
import (
"fmt"
)
type anyTypes struct {
union *UnionType
array *ArrayType
blob *BufferType
ptrPtr *PtrType
ptr64 *PtrType
res16 *ResourceType
res32 *ResourceType
res64 *ResourceType
resdec *ResourceType
reshex *ResourceType
resoct *ResourceType
}
// This generates type descriptions for:
//
// resource ANYRES16[int16]: 0xffffffffffffffff, 0
// resource ANYRES32[int32]: 0xffffffffffffffff, 0
// resource ANYRES64[int64]: 0xffffffffffffffff, 0
// ANY [
// bin array[int8]
// ptr ptr[in, array[ANY], opt]
// ptr64 ptr64[in, array[ANY], opt]
// res16 ANYRES16
// res32 ANYRES32
// res64 ANYRES64
// resdec fmt[dec, ANYRES64]
// reshex fmt[hex, ANYRES64]
// resoct fmt[oct, ANYRES64]
// ] [varlen]
func initAnyTypes(target *Target) {
target.any.union = &UnionType{
FldName: "ANYUNION",
}
target.any.array = &ArrayType{
TypeCommon: TypeCommon{
TypeName: "ANYARRAY",
FldName: "ANYARRAY",
IsVarlen: true,
},
Type: target.any.union,
}
target.any.ptrPtr = &PtrType{
TypeCommon: TypeCommon{
TypeName: "ptr",
FldName: "ANYPTR",
TypeSize: target.PtrSize,
IsOptional: true,
},
Type: target.any.array,
}
target.any.ptr64 = &PtrType{
TypeCommon: TypeCommon{
TypeName: "ptr64",
FldName: "ANYPTR64",
TypeSize: 8,
IsOptional: true,
},
Type: target.any.array,
}
target.any.blob = &BufferType{
TypeCommon: TypeCommon{
TypeName: "ANYBLOB",
FldName: "ANYBLOB",
IsVarlen: true,
},
}
createResource := func(name, base string, bf BinaryFormat, size uint64) *ResourceType {
return &ResourceType{
TypeCommon: TypeCommon{
TypeName: name,
FldName: name,
ArgDir: DirIn,
TypeSize: size,
IsOptional: true,
},
ArgFormat: bf,
Desc: &ResourceDesc{
Name: name,
Kind: []string{name},
Values: []uint64{^uint64(0), 0},
Type: &IntType{
IntTypeCommon: IntTypeCommon{
TypeCommon: TypeCommon{
TypeName: base,
TypeSize: size,
},
},
},
},
}
}
target.any.res16 = createResource("ANYRES16", "int16", FormatNative, 2)
target.any.res32 = createResource("ANYRES32", "int32", FormatNative, 4)
target.any.res64 = createResource("ANYRES64", "int64", FormatNative, 8)
target.any.resdec = createResource("ANYRESDEC", "int64", FormatStrDec, 20)
target.any.reshex = createResource("ANYRESHEX", "int64", FormatStrHex, 18)
target.any.resoct = createResource("ANYRESOCT", "int64", FormatStrOct, 23)
target.any.union.StructDesc = &StructDesc{
TypeCommon: TypeCommon{
TypeName: "ANYUNION",
FldName: "ANYUNION",
IsVarlen: true,
ArgDir: DirIn,
},
Fields: []Type{
target.any.blob,
target.any.ptrPtr,
target.any.ptr64,
target.any.res16,
target.any.res32,
target.any.res64,
target.any.resdec,
target.any.reshex,
target.any.resoct,
},
}
}
func (target *Target) makeAnyPtrType(size uint64, field string) *PtrType {
// We need to make a copy because type holds field name,
// and field names are used as len target.
var typ PtrType
if size == target.PtrSize {
typ = *target.any.ptrPtr
} else if size == 8 {
typ = *target.any.ptr64
} else {
panic(fmt.Sprintf("bad pointer size %v", size))
}
typ.TypeSize = size
if field != "" {
typ.FldName = field
}
return &typ
}
func (target *Target) isAnyPtr(typ Type) bool {
ptr, ok := typ.(*PtrType)
return ok && ptr.Type == target.any.array
}
func (p *Prog) complexPtrs() (res []*PointerArg) {
for _, c := range p.Calls {
ForeachArg(c, func(arg Arg, ctx *ArgCtx) {
if ptrArg, ok := arg.(*PointerArg); ok && p.Target.isComplexPtr(ptrArg) {
res = append(res, ptrArg)
ctx.Stop = true
}
})
}
return
}
func (target *Target) isComplexPtr(arg *PointerArg) bool {
if arg.Res == nil || arg.Type().Dir() != DirIn {
return false
}
if target.isAnyPtr(arg.Type()) {
return true
}
res := false
ForeachSubArg(arg.Res, func(a1 Arg, ctx *ArgCtx) {
switch typ := a1.Type().(type) {
case *StructType:
if typ.Varlen() {
res = true
ctx.Stop = true
}
case *UnionType:
if typ.Varlen() && len(typ.Fields) > 5 {
res = true
ctx.Stop = true
}
case *PtrType:
if a1 != arg {
ctx.Stop = true
}
}
})
return res
}
func (target *Target) CallContainsAny(c *Call) (res bool) {
ForeachArg(c, func(arg Arg, ctx *ArgCtx) {
if target.isAnyPtr(arg.Type()) {
res = true
ctx.Stop = true
}
})
return
}
func (target *Target) ArgContainsAny(arg0 Arg) (res bool) {
ForeachSubArg(arg0, func(arg Arg, ctx *ArgCtx) {
if target.isAnyPtr(arg.Type()) {
res = true
ctx.Stop = true
}
})
return
}
func (target *Target) squashPtr(arg *PointerArg, preserveField bool) {
if arg.Res == nil || arg.VmaSize != 0 {
panic("bad ptr arg")
}
res0 := arg.Res
size0 := res0.Size()
var elems []Arg
target.squashPtrImpl(arg.Res, &elems)
field := ""
if preserveField {
field = arg.Type().FieldName()
}
arg.typ = target.makeAnyPtrType(arg.Type().Size(), field)
arg.Res = MakeGroupArg(arg.typ.(*PtrType).Type, elems)
if size := arg.Res.Size(); size != size0 {
panic(fmt.Sprintf("squash changed size %v->%v for %v", size0, size, res0.Type()))
}
}
func (target *Target) squashPtrImpl(a Arg, elems *[]Arg) {
if a.Type().BitfieldLength() != 0 {
panic("bitfield in squash")
}
var pad uint64
switch arg := a.(type) {
case *ConstArg:
target.squashConst(arg, elems)
case *ResultArg:
target.squashResult(arg, elems)
case *PointerArg:
if arg.Res != nil {
target.squashPtr(arg, false)
*elems = append(*elems, MakeUnionArg(target.any.union, arg))
} else {
elem := target.ensureDataElem(elems)
addr := target.PhysicalAddr(arg)
for i := uint64(0); i < arg.Size(); i++ {
elem.data = append(elem.Data(), byte(addr))
addr >>= 8
}
}
case *UnionArg:
if !arg.Type().Varlen() {
pad = arg.Size() - arg.Option.Size()
}
target.squashPtrImpl(arg.Option, elems)
case *DataArg:
if arg.Type().Dir() == DirOut {
pad = arg.Size()
} else {
elem := target.ensureDataElem(elems)
elem.data = append(elem.Data(), arg.Data()...)
}
case *GroupArg:
target.squashGroup(arg, elems)
default:
panic("bad arg kind")
}
if pad != 0 {
elem := target.ensureDataElem(elems)
elem.data = append(elem.Data(), make([]byte, pad)...)
}
}
func (target *Target) squashConst(arg *ConstArg, elems *[]Arg) {
if IsPad(arg.Type()) {
elem := target.ensureDataElem(elems)
elem.data = append(elem.Data(), make([]byte, arg.Size())...)
return
}
v, bf := target.squashedValue(arg)
var data []byte
switch bf {
case FormatNative:
for i := uint64(0); i < arg.Size(); i++ {
data = append(data, byte(v))
v >>= 8
}
case FormatStrDec:
data = []byte(fmt.Sprintf("%020v", v))
case FormatStrHex:
data = []byte(fmt.Sprintf("0x%016x", v))
case FormatStrOct:
data = []byte(fmt.Sprintf("%023o", v))
default:
panic(fmt.Sprintf("unknown binary format: %v", bf))
}
if uint64(len(data)) != arg.Size() {
panic("squashed value of wrong size")
}
elem := target.ensureDataElem(elems)
elem.data = append(elem.Data(), data...)
}
func (target *Target) squashResult(arg *ResultArg, elems *[]Arg) {
switch arg.Type().Format() {
case FormatNative, FormatBigEndian:
switch arg.Size() {
case 2:
arg.typ = target.any.res16
case 4:
arg.typ = target.any.res32
case 8:
arg.typ = target.any.res64
default:
panic("bad size")
}
case FormatStrDec:
arg.typ = target.any.resdec
case FormatStrHex:
arg.typ = target.any.reshex
case FormatStrOct:
arg.typ = target.any.resoct
default:
panic("bad")
}
*elems = append(*elems, MakeUnionArg(target.any.union, arg))
}
func (target *Target) squashGroup(arg *GroupArg, elems *[]Arg) {
var pad uint64
if typ, ok := arg.Type().(*StructType); ok && typ.Varlen() && typ.AlignAttr != 0 {
var fieldsSize uint64
for _, fld := range arg.Inner {
fieldsSize += fld.Size()
}
if fieldsSize%typ.AlignAttr != 0 {
pad = typ.AlignAttr - fieldsSize%typ.AlignAttr
}
}
var bitfield uint64
for _, fld := range arg.Inner {
// Squash bitfields separately.
if fld.Type().IsBitfield() {
bfLen := fld.Type().BitfieldLength()
bfOff := fld.Type().BitfieldOffset()
// Note: we can have a ResultArg here as well,
// but it is unsupported at the moment.
v, bf := target.squashedValue(fld.(*ConstArg))
if bf != FormatNative {
panic(fmt.Sprintf("bitfield has bad format %v", bf))
}
bitfield |= (v & ((1 << bfLen) - 1)) << bfOff
if fld.Size() != 0 {
elem := target.ensureDataElem(elems)
for i := uint64(0); i < fld.Size(); i++ {
elem.data = append(elem.Data(), byte(bitfield))
bitfield >>= 8
}
bitfield = 0
}
continue
}
target.squashPtrImpl(fld, elems)
}
if pad != 0 {
elem := target.ensureDataElem(elems)
elem.data = append(elem.Data(), make([]byte, pad)...)
}
}
func (target *Target) squashedValue(arg *ConstArg) (uint64, BinaryFormat) {
typ := arg.Type()
bf := typ.Format()
if _, ok := typ.(*CsumType); ok {
// We can't compute value for the checksum here,
// but at least leave something recognizable by hints code.
// TODO: hints code won't recognize this, because it won't find
// the const in any arg. We either need to put this const as
// actual csum arg value, or special case it in hints.
return 0xabcdef1234567890, FormatNative
}
// Note: we need a constant value, but it depends on pid for proc.
v, _ := arg.Value()
if bf == FormatBigEndian {
bf = FormatNative
switch typ.UnitSize() {
case 2:
v = uint64(swap16(uint16(v)))
case 4:
v = uint64(swap32(uint32(v)))
case 8:
v = swap64(v)
default:
panic(fmt.Sprintf("bad const size %v", arg.Size()))
}
}
return v, bf
}
func (target *Target) ensureDataElem(elems *[]Arg) *DataArg {
if len(*elems) == 0 {
res := MakeDataArg(target.any.blob, nil)
*elems = append(*elems, MakeUnionArg(target.any.union, res))
return res
}
res, ok := (*elems)[len(*elems)-1].(*UnionArg).Option.(*DataArg)
if !ok {
res = MakeDataArg(target.any.blob, nil)
*elems = append(*elems, MakeUnionArg(target.any.union, res))
}
return res
}