How to use parseAttrs method of compiler Package

Best Syzkaller code snippet using compiler.parseAttrs

gen.go

Source:gen.go

...105	if n.Ret != nil {106		ret = comp.genType(n.Ret, comp.ptrSize)107	}108	var attrs prog.SyscallAttrs109	descAttrs := comp.parseAttrs(callAttrs, n, n.Attrs)110	for desc, val := range descAttrs {111		fld := reflect.ValueOf(&attrs).Elem().FieldByName(desc.Name)112		if desc.HasArg {113			fld.SetUint(val)114		} else {115			fld.SetBool(val != 0)116		}117	}118	return &prog.Syscall{119		Name:        n.Name.Name,120		CallName:    n.CallName,121		NR:          n.NR,122		MissingArgs: len(argSizes) - len(n.Args),123		Args:        comp.genFieldArray(n.Args, argSizes),124		Ret:         ret,125		Attrs:       attrs,126	}127}128type typeProxy struct {129	typ       prog.Type130	id        string131	ref       prog.Ref132	locations []*prog.Type133}134func (comp *compiler) generateTypes(syscalls []*prog.Syscall) []prog.Type {135	// Replace all Type's in the descriptions with Ref's136	// and prepare a sorted array of corresponding real types.137	proxies := make(map[string]*typeProxy)138	prog.ForeachTypePost(syscalls, func(typ prog.Type, ctx prog.TypeCtx) {139		if _, ok := typ.(prog.Ref); ok {140			return141		}142		if !typ.Varlen() && typ.Size() == sizeUnassigned {143			panic("unassigned size")144		}145		id := typ.Name()146		switch typ.(type) {147		case *prog.StructType, *prog.UnionType:148			// There types can be uniquely identified with the name.149		default:150			buf := new(bytes.Buffer)151			serializer.Write(buf, typ)152			id = buf.String()153		}154		proxy := proxies[id]155		if proxy == nil {156			proxy = &typeProxy{157				typ: typ,158				id:  id,159				ref: prog.Ref(len(proxies)),160			}161			proxies[id] = proxy162		}163		*ctx.Ptr = proxy.ref164		proxy.locations = append(proxy.locations, ctx.Ptr)165	})166	array := make([]*typeProxy, 0, len(proxies))167	for _, proxy := range proxies {168		array = append(array, proxy)169	}170	sort.Slice(array, func(i, j int) bool {171		return array[i].id < array[j].id172	})173	types := make([]prog.Type, len(array))174	for i, proxy := range array {175		types[i] = proxy.typ176		for _, loc := range proxy.locations {177			*loc = prog.Ref(i)178		}179	}180	return types181}182func (comp *compiler) layoutTypes(syscalls []*prog.Syscall) {183	// Calculate struct/union/array sizes, add padding to structs, mark bitfields.184	padded := make(map[prog.Type]bool)185	prog.ForeachTypePost(syscalls, func(typ prog.Type, _ prog.TypeCtx) {186		comp.layoutType(typ, padded)187	})188}189func (comp *compiler) layoutType(typ prog.Type, padded map[prog.Type]bool) {190	if padded[typ] {191		return192	}193	switch t := typ.(type) {194	case *prog.ArrayType:195		comp.layoutType(t.Elem, padded)196		comp.layoutArray(t)197	case *prog.StructType:198		for _, f := range t.Fields {199			comp.layoutType(f.Type, padded)200		}201		comp.layoutStruct(t)202	case *prog.UnionType:203		for _, f := range t.Fields {204			comp.layoutType(f.Type, padded)205		}206		comp.layoutUnion(t)207	default:208		return209	}210	if !typ.Varlen() && typ.Size() == sizeUnassigned {211		panic("size unassigned")212	}213	padded[typ] = true214}215func (comp *compiler) layoutArray(t *prog.ArrayType) {216	t.TypeSize = 0217	if t.Kind == prog.ArrayRangeLen && t.RangeBegin == t.RangeEnd && !t.Elem.Varlen() {218		t.TypeSize = t.RangeBegin * t.Elem.Size()219	}220}221func (comp *compiler) layoutUnion(t *prog.UnionType) {222	structNode := comp.structs[t.TypeName]223	attrs := comp.parseAttrs(unionAttrs, structNode, structNode.Attrs)224	t.TypeSize = 0225	if attrs[attrVarlen] != 0 {226		return227	}228	sizeAttr, hasSize := attrs[attrSize]229	for i, fld := range t.Fields {230		sz := fld.Size()231		if hasSize && sz > sizeAttr {232			comp.error(structNode.Fields[i].Pos, "union %v has size attribute %v"+233				" which is less than field %v size %v",234				structNode.Name.Name, sizeAttr, fld.Type.Name(), sz)235		}236		if t.TypeSize < sz {237			t.TypeSize = sz238		}239	}240	if hasSize {241		t.TypeSize = sizeAttr242	}243}244func (comp *compiler) layoutStruct(t *prog.StructType) {245	// Add paddings, calculate size, mark bitfields.246	structNode := comp.structs[t.TypeName]247	varlen := false248	for _, f := range t.Fields {249		if f.Varlen() {250			varlen = true251		}252	}253	attrs := comp.parseAttrs(structAttrs, structNode, structNode.Attrs)254	t.AlignAttr = attrs[attrAlign]255	comp.layoutStructFields(t, varlen, attrs[attrPacked] != 0)256	t.TypeSize = 0257	if !varlen {258		for _, f := range t.Fields {259			t.TypeSize += f.Size()260		}261		sizeAttr, hasSize := attrs[attrSize]262		if hasSize {263			if t.TypeSize > sizeAttr {264				comp.error(structNode.Attrs[0].Pos, "struct %v has size attribute %v"+265					" which is less than struct size %v",266					structNode.Name.Name, sizeAttr, t.TypeSize)267			}268			if pad := sizeAttr - t.TypeSize; pad != 0 {269				t.Fields = append(t.Fields, genPad(pad))270			}271			t.TypeSize = sizeAttr272		}273	}274}275func (comp *compiler) layoutStructFields(t *prog.StructType, varlen, packed bool) {276	var newFields []prog.Field277	var structAlign, byteOffset, bitOffset uint64278	for i, field := range t.Fields {279		f := field.Type280		fieldAlign := uint64(1)281		if !packed {282			fieldAlign = f.Alignment()283			if structAlign < fieldAlign {284				structAlign = fieldAlign285			}286		}287		fullBitOffset := byteOffset*8 + bitOffset288		var fieldOffset uint64289		if f.IsBitfield() {290			unitAlign := f.UnitSize()291			if packed {292				unitAlign = 1293			}294			fieldOffset = rounddown(fullBitOffset/8, unitAlign)295			unitBits := f.UnitSize() * 8296			occupiedBits := fullBitOffset - fieldOffset*8297			remainBits := unitBits - occupiedBits298			if remainBits < f.BitfieldLength() {299				fieldOffset = roundup(roundup(fullBitOffset, 8)/8, unitAlign)300				fullBitOffset, bitOffset = 0, 0301			} else if fieldOffset*8 >= fullBitOffset {302				fullBitOffset, bitOffset = fieldOffset*8, 0303			}304			fieldBitOffset := (fullBitOffset - fieldOffset*8) % unitBits305			setBitfieldOffset(f, fieldBitOffset)306		} else {307			fieldOffset = roundup(roundup(fullBitOffset, 8)/8, fieldAlign)308			bitOffset = 0309		}310		if fieldOffset > byteOffset {311			pad := fieldOffset - byteOffset312			byteOffset += pad313			if i != 0 && t.Fields[i-1].IsBitfield() {314				setBitfieldTypeSize(t.Fields[i-1].Type, pad)315				if bitOffset >= 8*pad {316					// The padding is due to bitfields, so consume the bitOffset.317					bitOffset -= 8 * pad318				} else if bitOffset >= 8 {319					// Unclear is this is a bug or not and what to do in this case.320					// But since we don't have any descriptions that trigger this,321					// let's just guard with the panic.322					panic(fmt.Sprintf("bad bitOffset: %v.%v pad=%v bitOffset=%v",323						t.Name(), field.Name, pad, bitOffset))324				}325			} else {326				newFields = append(newFields, genPad(pad))327			}328		}329		if f.IsBitfield() {330			if byteOffset > fieldOffset {331				unitOffset := byteOffset - fieldOffset332				setBitfieldUnitOffset(f, unitOffset)333			}334		}335		newFields = append(newFields, field)336		if f.IsBitfield() {337			bitOffset += f.BitfieldLength()338		} else if !f.Varlen() {339			// Increase offset if the current field except when it's340			// the last field in a struct and has variable length.341			byteOffset += f.Size()342		}343	}344	if bitOffset != 0 {345		pad := roundup(bitOffset, 8) / 8346		byteOffset += pad347		i := len(t.Fields)348		if i != 0 && t.Fields[i-1].IsBitfield() {349			setBitfieldTypeSize(t.Fields[i-1].Type, pad)350		} else {351			newFields = append(newFields, genPad(pad))352		}353	}354	if t.AlignAttr != 0 {355		structAlign = t.AlignAttr356	}357	if !varlen && structAlign != 0 && byteOffset%structAlign != 0 {358		pad := structAlign - byteOffset%structAlign359		newFields = append(newFields, genPad(pad))360	}361	t.Fields = newFields362}363func roundup(v, a uint64) uint64 {364	return rounddown(v+a-1, a)365}366func rounddown(v, a uint64) uint64 {367	if (a & (a - 1)) != 0 {368		panic(fmt.Sprintf("rounddown(%v)", a))369	}370	return v & ^(a - 1)371}372func bitfieldFields(t0 prog.Type) (*uint64, *uint64, *uint64) {373	switch t := t0.(type) {374	case *prog.IntType:375		return &t.TypeSize, &t.BitfieldOff, &t.BitfieldUnitOff376	case *prog.ConstType:377		return &t.TypeSize, &t.BitfieldOff, &t.BitfieldUnitOff378	case *prog.LenType:379		return &t.TypeSize, &t.BitfieldOff, &t.BitfieldUnitOff380	case *prog.FlagsType:381		return &t.TypeSize, &t.BitfieldOff, &t.BitfieldUnitOff382	case *prog.ProcType:383		return &t.TypeSize, &t.BitfieldOff, &t.BitfieldUnitOff384	default:385		panic(fmt.Sprintf("type %#v can't be a bitfield", t))386	}387}388func setBitfieldTypeSize(t prog.Type, v uint64) {389	p, _, _ := bitfieldFields(t)390	*p = v391}392func setBitfieldOffset(t prog.Type, v uint64) {393	_, p, _ := bitfieldFields(t)394	*p = v395}396func setBitfieldUnitOffset(t prog.Type, v uint64) {397	_, _, p := bitfieldFields(t)398	*p = v399}400func genPad(size uint64) prog.Field {401	return prog.Field{402		Type: &prog.ConstType{403			IntTypeCommon: genIntCommon(genCommon("pad", size, false), 0, false),404			IsPad:         true,405		},406	}407}408func (comp *compiler) genFieldArray(fields []*ast.Field, argSizes []uint64) []prog.Field {409	var res []prog.Field410	for i, f := range fields {411		res = append(res, comp.genField(f, argSizes[i]))412	}413	return res414}415func (comp *compiler) genFieldDir(f *ast.Field) (prog.Dir, bool) {416	attrs := comp.parseAttrs(fieldAttrs, f, f.Attrs)417	switch {418	case attrs[attrIn] != 0:419		return prog.DirIn, true420	case attrs[attrOut] != 0:421		return prog.DirOut, true422	case attrs[attrInOut] != 0:423		return prog.DirInOut, true424	default:425		return prog.DirIn, false426	}427}428func (comp *compiler) genField(f *ast.Field, argSize uint64) prog.Field {429	dir, hasDir := comp.genFieldDir(f)430	return prog.Field{...

parseAttrs

Using AI Code Generation

1import (2func main() {3	fset := token.NewFileSet()4	f, err := parser.ParseFile(fset, "1.go", nil, parser.ParseComments)5	if err != nil {6		panic(err)7	}8	ast.Inspect(f, func(n ast.Node) bool {9		switch x := n.(type) {10			for _, spec := range x.Specs {11				switch spec := spec.(type) {12					for _, name := range spec.Names {13						fmt.Println(name)14					}15				}16			}17		}18	})19}20import (

parseAttrs

Using AI Code Generation

1import (2func main() {3	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {4		c := compiler{r}5		fmt.Fprintf(w, "Hello, %s", c.parseAttrs())6	})7	http.ListenAndServe(":8080", nil)8}9type compiler struct {10}11func (c *compiler) parseAttrs() string {12}13import (14func main() {15	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {16		c := compiler{r}17		fmt.Fprintf(w, "Hello, %s", c.parseAttrs())18	})19	http.ListenAndServe(":8080", nil)20}21type compiler struct {22}23func (c *compiler) parseAttrs() string {24}25import (26func main() {27	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {28		c := compiler{r}29		fmt.Fprintf(w, "Hello, %s", c.parseAttrs())30	})31	http.ListenAndServe(":8080", nil)32}33type compiler struct {34}35func (c *compiler) parseAttrs() string {36}37import (38func main() {39	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {40		c := compiler{r}41		fmt.Fprintf(w, "Hello, %s", c.parseAttrs())42	})43	http.ListenAndServe(":8080", nil)44}45type compiler struct {46}47func (c *compiler) parseAttrs() string {48}

parseAttrs

Using AI Code Generation

1import (2type constantPoolInfo struct {3	info interface{}4}5type fieldInfo struct {6}7type methodInfo struct {8}9type attributeInfo struct {10}11type classFile struct {12}13func main() {14	file, err := os.Open("C:\\Users\\Akhil\\Desktop\\Test\\Test.class")15	if err != nil {16		fmt.Println(err)17	}18	defer file.Close()19	reader := bufio.NewReader(file)20	cf := classFile{}21	binary.Read(reader, binary.BigEndian, &cf.magic)22	binary.Read(reader, binary.BigEndian, &cf.minorVersion)23	binary.Read(reader, binary.BigEndian, &cf.majorVersion)24	binary.Read(reader, binary.BigEndian, &cf.constantPoolCount)25	cf.constantPool = make([]constantPoolInfo, cf.constantPoolCount - 1)26	for i := 0; i < int(cf.constantPoolCount - 1); i++ {27		binary.Read(reader, binary.BigEndian, &tag)28		switch tag {

parseAttrs

Using AI Code Generation

1import (2type ClassFile struct {3    ConstantPool []interface{}4    Fields []interface{}5    Methods []interface{}6    Attributes []interface{}7}8type ConstantUtf8Info struct {9}10type ConstantIntegerInfo struct {11}12type ConstantFloatInfo struct {13}14type ConstantLongInfo struct {15}16type ConstantDoubleInfo struct {17}18type ConstantClassInfo struct {19}20type ConstantStringInfo struct {21}22type ConstantFieldrefInfo struct {23}24type ConstantMethodrefInfo struct {25}26type ConstantInterfaceMethodrefInfo struct {27}28type ConstantNameAndTypeInfo struct {29}30type ConstantMethodHandleInfo struct {31}32type ConstantMethodTypeInfo struct {33}34type ConstantInvokeDynamicInfo struct {35}36type ConstantPoolInfo struct {37    Info interface{}38}39type ConstantValueAttribute struct {40}41type CodeAttribute struct {42    ExceptionTable []interface{}43    Attributes []interface{}44}45type ExceptionsAttribute struct {46}47type InnerClassesAttribute struct {48    Classes []interface{}49}50type EnclosingMethodAttribute struct {

parseAttrs

Using AI Code Generation

1import (2func main() {3    compiler.ParseAttrs("compiler.go")4    fmt.Println(compiler)5}6import (7func main() {8    compiler.ParseAttrs("compiler.go")9    fmt.Println(compiler)10}

parseAttrs

Using AI Code Generation

1import java.io.*;2import java.util.*;3import java.util.zip.*;4public class Compiler{5	String classFileName;6	String className;7	String superClassName;8	int accessFlags;9	int interfaceCount;10	String[] interfaceNames;11	int fieldCount;12	String[] fieldNames;13	String[] fieldTypes;14	int[] fieldAccessFlags;15	int methodCount;16	String[] methodNames;17	String[] methodTypes;18	int[] methodAccessFlags;19	int attributeCount;20	String[] attributeNames;21	int[] attributeLengths;22	String[] attributeValues;23	int constantPoolCount;24	int[] constantPoolTags;25	String[] constantPoolValues;26	int[] constantPoolSize;27	int[] constantPoolIndex;28	int[] constantPoolIndex2;29	int[] constantPoolIndex3;30	int[] constantPoolIndex4;31	int[] constantPoolIndex5;32	int[] constantPoolIndex6;33	int[] constantPoolIndex7;34	int[] constantPoolIndex8;

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