How to use genFieldArray method of compiler Package

Best Syzkaller code snippet using compiler.genFieldArray

gen.go

Source:gen.go

...58	return &prog.Syscall{59		Name:     n.Name.Name,60		CallName: n.CallName,61		NR:       n.NR,62		Args:     comp.genFieldArray(n.Args, prog.DirIn, true),63		Ret:      ret,64	}65}66func (comp *compiler) genStructDescs(syscalls []*prog.Syscall) []*prog.KeyedStruct {67	// Calculate struct/union/array sizes, add padding to structs and detach68	// StructDesc's from StructType's. StructType's can be recursive so it's69	// not possible to write them out inline as other types. To break the70	// recursion detach them, and write StructDesc's out as separate array71	// of KeyedStruct's. prog package will reattach them during init.72	padded := make(map[interface{}]bool)73	detach := make(map[**prog.StructDesc]bool)74	var structs []*prog.KeyedStruct75	var rec func(t prog.Type)76	checkStruct := func(key prog.StructKey, descp **prog.StructDesc) bool {77		detach[descp] = true78		desc := *descp79		if padded[desc] {80			return false81		}82		padded[desc] = true83		for _, f := range desc.Fields {84			rec(f)85			if !f.Varlen() && f.Size() == sizeUnassigned {86				// An inner struct is not padded yet.87				// Leave this struct for next iteration.88				delete(padded, desc)89				return false90			}91		}92		if comp.used[key.Name] {93			structs = append(structs, &prog.KeyedStruct{94				Key:  key,95				Desc: desc,96			})97		}98		return true99	}100	rec = func(t0 prog.Type) {101		switch t := t0.(type) {102		case *prog.PtrType:103			rec(t.Type)104		case *prog.ArrayType:105			if padded[t] {106				return107			}108			rec(t.Type)109			if !t.Type.Varlen() && t.Type.Size() == sizeUnassigned {110				// An inner struct is not padded yet.111				// Leave this array for next iteration.112				return113			}114			padded[t] = true115			t.TypeSize = 0116			if t.Kind == prog.ArrayRangeLen && t.RangeBegin == t.RangeEnd && !t.Type.Varlen() {117				t.TypeSize = t.RangeBegin * t.Type.Size()118			}119		case *prog.StructType:120			if !checkStruct(t.Key, &t.StructDesc) {121				return122			}123			structNode := comp.structNodes[t.StructDesc]124			// Add paddings, calculate size, mark bitfields.125			varlen := false126			for _, f := range t.Fields {127				if f.Varlen() {128					varlen = true129				}130			}131			comp.markBitfields(t.Fields)132			packed, sizeAttr, alignAttr := comp.parseStructAttrs(structNode)133			t.Fields = comp.addAlignment(t.Fields, varlen, packed, alignAttr)134			t.AlignAttr = alignAttr135			t.TypeSize = 0136			if !varlen {137				for _, f := range t.Fields {138					if !f.BitfieldMiddle() {139						t.TypeSize += f.Size()140					}141				}142				if sizeAttr != sizeUnassigned {143					if t.TypeSize > sizeAttr {144						comp.error(structNode.Pos, "struct %v has size attribute %v"+145							" which is less than struct size %v",146							structNode.Name.Name, sizeAttr, t.TypeSize)147					}148					if pad := sizeAttr - t.TypeSize; pad != 0 {149						t.Fields = append(t.Fields, genPad(pad))150					}151					t.TypeSize = sizeAttr152				}153			}154		case *prog.UnionType:155			if !checkStruct(t.Key, &t.StructDesc) {156				return157			}158			structNode := comp.structNodes[t.StructDesc]159			varlen, sizeAttr := comp.parseUnionAttrs(structNode)160			t.TypeSize = 0161			if !varlen {162				for _, fld := range t.Fields {163					sz := fld.Size()164					if sizeAttr != sizeUnassigned && sz > sizeAttr {165						comp.error(structNode.Pos, "union %v has size attribute %v"+166							" which is less than field %v size %v",167							structNode.Name.Name, sizeAttr, fld.Name(), sz)168					}169					if t.TypeSize < sz {170						t.TypeSize = sz171					}172				}173				if sizeAttr != sizeUnassigned {174					t.TypeSize = sizeAttr175				}176			}177		}178	}179	// We have to do this in the loop until we pad nothing new180	// due to recursive structs.181	for {182		start := len(padded)183		for _, c := range syscalls {184			for _, a := range c.Args {185				rec(a)186			}187			if c.Ret != nil {188				rec(c.Ret)189			}190		}191		if start == len(padded) {192			break193		}194	}195	// Detach StructDesc's from StructType's. prog will reattach them again.196	for descp := range detach {197		*descp = nil198	}199	sort.Slice(structs, func(i, j int) bool {200		si, sj := structs[i], structs[j]201		if si.Key.Name != sj.Key.Name {202			return si.Key.Name < sj.Key.Name203		}204		return si.Key.Dir < sj.Key.Dir205	})206	return structs207}208func (comp *compiler) genStructDesc(res *prog.StructDesc, n *ast.Struct, dir prog.Dir, varlen bool) {209	// Leave node for genStructDescs to calculate size/padding.210	comp.structNodes[res] = n211	common := genCommon(n.Name.Name, "", sizeUnassigned, dir, false)212	common.IsVarlen = varlen213	*res = prog.StructDesc{214		TypeCommon: common,215		Fields:     comp.genFieldArray(n.Fields, dir, false),216	}217}218func (comp *compiler) markBitfields(fields []prog.Type) {219	var bfOffset uint64220	for i, f := range fields {221		if f.BitfieldLength() == 0 {222			continue223		}224		off, middle := bfOffset, true225		bfOffset += f.BitfieldLength()226		if i == len(fields)-1 || // Last bitfield in a group, if last field of the struct...227			fields[i+1].BitfieldLength() == 0 || // or next field is not a bitfield...228			f.Size() != fields[i+1].Size() || // or next field is of different size...229			bfOffset+fields[i+1].BitfieldLength() > f.Size()*8 { // or next field does not fit into the current group.230			middle, bfOffset = false, 0231		}232		setBitfieldOffset(f, off, middle)233	}234}235func setBitfieldOffset(t0 prog.Type, offset uint64, middle bool) {236	switch t := t0.(type) {237	case *prog.IntType:238		t.BitfieldOff, t.BitfieldMdl = offset, middle239	case *prog.ConstType:240		t.BitfieldOff, t.BitfieldMdl = offset, middle241	case *prog.LenType:242		t.BitfieldOff, t.BitfieldMdl = offset, middle243	case *prog.FlagsType:244		t.BitfieldOff, t.BitfieldMdl = offset, middle245	case *prog.ProcType:246		t.BitfieldOff, t.BitfieldMdl = offset, middle247	default:248		panic(fmt.Sprintf("type %#v can't be a bitfield", t))249	}250}251func (comp *compiler) addAlignment(fields []prog.Type, varlen, packed bool, alignAttr uint64) []prog.Type {252	var newFields []prog.Type253	if packed {254		// If a struct is packed, statically sized and has explicitly set alignment,255		// add a padding at the end.256		newFields = fields257		if !varlen && alignAttr != 0 {258			size := uint64(0)259			for _, f := range fields {260				if !f.BitfieldMiddle() {261					size += f.Size()262				}263			}264			if tail := size % alignAttr; tail != 0 {265				newFields = append(newFields, genPad(alignAttr-tail))266			}267		}268		return newFields269	}270	var align, off uint64271	for i, f := range fields {272		if i == 0 || !fields[i-1].BitfieldMiddle() {273			a := comp.typeAlign(f)274			if align < a {275				align = a276			}277			// Append padding if the last field is not a bitfield or it's the last bitfield in a set.278			if off%a != 0 {279				pad := a - off%a280				off += pad281				newFields = append(newFields, genPad(pad))282			}283		}284		newFields = append(newFields, f)285		if !f.BitfieldMiddle() && (i != len(fields)-1 || !f.Varlen()) {286			// Increase offset if the current field is not a bitfield287			// or it's the last bitfield in a set, except when it's288			// the last field in a struct and has variable length.289			off += f.Size()290		}291	}292	if alignAttr != 0 {293		align = alignAttr294	}295	if align != 0 && off%align != 0 && !varlen {296		pad := align - off%align297		off += pad298		newFields = append(newFields, genPad(pad))299	}300	return newFields301}302func (comp *compiler) typeAlign(t0 prog.Type) uint64 {303	switch t0.(type) {304	case *prog.IntType, *prog.ConstType, *prog.LenType, *prog.FlagsType, *prog.ProcType,305		*prog.CsumType, *prog.PtrType, *prog.VmaType, *prog.ResourceType:306		return t0.Size()307	case *prog.BufferType:308		return 1309	}310	switch t := t0.(type) {311	case *prog.ArrayType:312		return comp.typeAlign(t.Type)313	case *prog.StructType:314		packed, _, alignAttr := comp.parseStructAttrs(comp.structNodes[t.StructDesc])315		if alignAttr != 0 {316			return alignAttr // overrided by user attribute317		}318		if packed {319			return 1320		}321		align := uint64(0)322		for _, f := range t.Fields {323			if a := comp.typeAlign(f); align < a {324				align = a325			}326		}327		return align328	case *prog.UnionType:329		align := uint64(0)330		for _, f := range t.Fields {331			if a := comp.typeAlign(f); align < a {332				align = a333			}334		}335		return align336	default:337		panic(fmt.Sprintf("unknown type: %#v", t))338	}339}340func genPad(size uint64) prog.Type {341	return &prog.ConstType{342		IntTypeCommon: genIntCommon(genCommon("pad", "", size, prog.DirIn, false), 0, false),343		IsPad:         true,344	}345}346func (comp *compiler) genField(f *ast.Field, dir prog.Dir, isArg bool) prog.Type {347	return comp.genType(f.Type, f.Name.Name, dir, isArg)348}349func (comp *compiler) genFieldArray(fields []*ast.Field, dir prog.Dir, isArg bool) []prog.Type {350	var res []prog.Type351	for _, f := range fields {352		res = append(res, comp.genField(f, dir, isArg))353	}354	return res355}356func (comp *compiler) genType(t *ast.Type, field string, dir prog.Dir, isArg bool) prog.Type {357	desc, args, base := comp.getArgsBase(t, field, dir, isArg)358	if desc.Gen == nil {359		panic(fmt.Sprintf("no gen for %v %#v", field, t))360	}361	base.IsVarlen = desc.Varlen != nil && desc.Varlen(comp, t, args)362	return desc.Gen(comp, t, args, base)363}...

genFieldArray

Using AI Code Generation

1import (2type compiler struct {3}4func (c *compiler) genFieldArray(v reflect.Value) []string {5	for i := 0; i < v.NumField(); i++ {6		fields = append(fields, v.Type().Field(i).Name)7	}8}9type myStruct struct {10}11func main() {12	c := compiler{}13	s := myStruct{Field1: "Hello", Field2: "World"}14	fmt.Println(c.genFieldArray(reflect.ValueOf(s)))15}

genFieldArray

Using AI Code Generation

1import (2func main() {3    p := program.NewProgram()4    p.AddSource("main.c", `int main() {5        int a[10];6        return 0;7    }`)8    err := p.ParseAST()9    if err != nil {10        panic(err)11    }12    err = p.ResolveTypes()13    if err != nil {14        panic(err)15    }16    fmt.Println(p.GenFieldArray())17}18import "unsafe"19func main() {20}

genFieldArray

Using AI Code Generation

1import (2func main() {3	var s1 struct {4	}5	fmt.Println(reflect.TypeOf(s1).Field(0).Name)6}7import (8type struct {9}10func main() {11	var s1 struct {12	}13	fmt.Println(reflect.TypeOf(s1).Field(0).Name)14}15import (16type s1 struct {17}18func main() {19	var s1 struct {20	}21	fmt.Println(reflect.TypeOf(s1).Field(0).Name)22}23import (24type s1 struct {25}26func main() {27	fmt.Println(reflect.TypeOf(s1).Field(0).Name)28}29import (30type s1 struct {31}32func main() {33	fmt.Println(reflect.TypeOf(s1).Field(0).Name)34}35import (36type s1 struct {37}38func main() {39	fmt.Println(reflect.TypeOf(s1).Field(0).Name)40}41import (42type s1 struct {43}44func main() {45	fmt.Println(reflect.TypeOf(s1).Field(0).Name)46}

genFieldArray

Using AI Code Generation

1func main() {2    c := compiler.New()3    c.GenFieldArray()4}5func main() {6    c := compiler.New()7    c.GenMethodArray()8}9func main() {10    c := compiler.New()11    c.GenInterfaceArray()12}13func main() {14    c := compiler.New()15    c.GenTypeArray()16}17func main() {18    c := compiler.New()19    c.GenFuncArray()20}21func main() {22    c := compiler.New()23    c.GenConstArray()24}25func main() {26    c := compiler.New()27    c.GenVarArray()28}29func main() {30    c := compiler.New()31    c.GenFieldArray()32}33func main() {34    c := compiler.New()35    c.GenTypeArray()36}

genFieldArray

Using AI Code Generation

1import (2type sample struct {3}4func main() {5	s := sample{6	}7	v := reflect.ValueOf(s)8	t := v.Type()9	c := compiler{}10	f := c.genFieldArray(t)11	fmt.Println(f)12}

genFieldArray

Using AI Code Generation

1import (2func main() {3	c.genFieldArray()4}5type compiler struct {6}7func (c *compiler) genFieldArray() {8	s := student{}9	t := reflect.TypeOf(s)10	for i := 0; i < t.NumField(); i++ {11		f := field{}12		field := t.Field(i)13		c.fields = append(c.fields, f)14	}15	fmt.Println(c.fields)16}17type field struct {18}19type student struct {20}21[{name string  json:"name"} {age int  json:"age"} {marks float64  json:"marks"}]

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