How to use setBitfieldUnitOffset method of compiler Package

Best Syzkaller code snippet using compiler.setBitfieldUnitOffset

gen.go

Source:gen.go Github

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...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 {...

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setBitfieldUnitOffset

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1import (2func main() {3 fmt.Println("Hello, playground")4}5import (6func main() {7 fmt.Println("Hello, playground")8}9import (10func main() {11 fmt.Println("Hello, playground")12}13import (14func main() {15 fmt.Println("Hello, playground")16}17import (18func main() {19 fmt.Println("Hello, playground")20}21import (22func main() {23 fmt.Println("Hello, playground")24}25import (26func main() {27 fmt.Println("Hello, playground")28}29import (30func main() {31 fmt.Println("Hello, playground")32}33import (34func main() {35 fmt.Println("Hello, playground")36}37import (38func main() {39 fmt.Println("Hello, playground")40}41import (42func main() {43 fmt.Println("Hello, playground")44}45import (46func main() {47 fmt.Println("Hello, playground")48}

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setBitfieldUnitOffset

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1import "fmt"2func main() {3 compiler := new(Compiler)4 compiler.setBitfieldUnitOffset(5)5 fmt.Println("The bitfield unit offset is", compiler.bitfieldUnitOffset)6}7import "fmt"8func main() {9 compiler := new(Compiler)10 compiler.setBitfieldUnitOffset(5)11 fmt.Println("The bitfield unit offset is", compiler.bitfieldUnitOffset)12}13import "fmt"14func main() {15 compiler := new(Compiler)16 compiler.setBitfieldUnitOffset(5)17 fmt.Println("The bitfield unit offset is", compiler.bitfieldUnitOffset)18}19import "fmt"20func main() {21 compiler := new(Compiler)22 compiler.setBitfieldUnitOffset(5)23 fmt.Println("The bitfield unit offset is", compiler.bitfieldUnitOffset)24}25import "fmt"26func main() {27 compiler := new(Compiler)28 compiler.setBitfieldUnitOffset(5)29 fmt.Println("The bitfield unit offset is", compiler.bitfieldUnitOffset)30}31import "fmt"32func main() {33 compiler := new(Compiler)34 compiler.setBitfieldUnitOffset(5)35 fmt.Println("The bitfield unit offset is", compiler.bitfieldUnitOffset)36}37import "fmt"38func main() {39 compiler := new(Compiler)40 compiler.setBitfieldUnitOffset(5)41 fmt.Println("The bitfield unit offset is", compiler.bitfieldUnitOffset)42}43import "fmt"44func main() {45 compiler := new(Compiler)46 compiler.setBitfieldUnitOffset(5)

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setBitfieldUnitOffset

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1import (2func main() {3 f, err := parser.ParseFile(fset, "2.go", nil, parser.ParseComments)4 if err != nil {5 log.Fatal(err)6 }7 ast.Print(fset, f)8 ast.Print(fset, f)9 pkgs, err := packages.Load(&packages.Config{10 }, ".")11 if err != nil {12 log.Fatal(err)13 }

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setBitfieldUnitOffset

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1import "fmt"2func main() {3 var x struct {4 }5 fmt.Println("x.f1:", unsafe.Offsetof(x.f1))6 fmt.Println("x.f2:", unsafe.Offsetof(x.f2))7 fmt.Println("x.f3:", unsafe.Offsetof(x.f3))8}9import "fmt"10func main() {11 var x struct {12 }13 fmt.Println("x.f1:", unsafe.Offsetof(x.f1))14 fmt.Println("x.f2:", unsafe.Offsetof(x.f2))15 fmt.Println("x.f3:", unsafe.Offsetof(x.f3))16}17import "fmt"18func main() {19 var x struct {20 }21 fmt.Println("x.f1:", unsafe.Offsetof(x.f1))22 fmt.Println("x.f2:", unsafe.Offsetof(x.f2))23 fmt.Println("x.f3:", unsafe.Offsetof(x.f3))24}25import "fmt"26func main() {27 var x struct {28 }29 fmt.Println("x.f1:", unsafe.Offsetof(x.f1))30 fmt.Println("x

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setBitfieldUnitOffset

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1import "fmt"2func main() {3 fmt.Println("Enter the 4 units of bitfield")4 fmt.Scan(&unit1, &unit2, &unit3, &unit4)5 fmt.Println("Enter the offset and size of bitfield")6 fmt.Scan(&offset, &size)7 fmt.Println("The bitfield is", setBitfieldUnitOffset(unit1, unit2, unit3, unit4, offset, size))8}9func setBitfieldUnitOffset(unit1, unit2, unit3, unit4, offset, size int) int {10 mask = (1 << size) - 111 mask = mask & (unit2 | (unit3 << 8) | (unit4 << 16))12}

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setBitfieldUnitOffset

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1import (2func main() {3 var a struct {4 }5 fmt.Println("Size of struct a is", unsafe.Sizeof(a))6}

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setBitfieldUnitOffset

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1func setBitfieldUnitOffset(field, offset) {2}3func getBitfieldUnitOffset(field) {4}5func setBitfieldUnitSize(field, size) {6}7func getBitfieldUnitSize(field) {8}9func setBitfieldOffset(field, offset) {10}

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