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How to use shrinkExpand method of prog Package

Best Syzkaller code snippet using prog.shrinkExpand

hints.go

Source:hints.go

...91	}92}93func checkConstArg(arg *ConstArg, compMap CompMap, exec func()) {94	original := arg.Val95	// Note: because shrinkExpand returns a map, order of programs is non-deterministic.96	// This can affect test coverage reports.97	for _, replacer := range shrinkExpand(original, compMap) {98		arg.Val = replacer99		exec()100	}101	arg.Val = original102}103func checkDataArg(arg *DataArg, compMap CompMap, exec func()) {104	bytes := make([]byte, 8)105	data := arg.Data()106	size := len(data)107	if size > maxDataLength {108		size = maxDataLength109	}110	for i := 0; i < size; i++ {111		original := make([]byte, 8)112		copy(original, data[i:])113		val := binary.LittleEndian.Uint64(original)114		for _, replacer := range shrinkExpand(val, compMap) {115			binary.LittleEndian.PutUint64(bytes, replacer)116			copy(data[i:], bytes)117			exec()118		}119		copy(data[i:], original)120	}121}122// Shrink and expand mutations model the cases when the syscall arguments123// are casted to narrower (and wider) integer types.124// ======================================================================125// Motivation for shrink:126// void f(u16 x) {127//		u8 y = (u8)x;128//		if (y == 0xab) {...}129// }130// If we call f(0x1234), then we'll see a comparison 0x34 vs 0xab and we'll131// be unable to match the argument 0x1234 with any of the comparison operands.132// Thus we shrink 0x1234 to 0x34 and try to match 0x34.133// If there's a match for the shrank value, then we replace the corresponding134// bytes of the input (in the given example we'll get 0x12ab).135// Sometimes the other comparison operand will be wider than the shrank value136// (in the example above consider comparison if (y == 0xdeadbeef) {...}).137// In this case we ignore such comparison because we couldn't come up with138// any valid code example that does similar things. To avoid such comparisons139// we check the sizes with leastSize().140// ======================================================================141// Motivation for expand:142// void f(i8 x) {143//		i16 y = (i16)x;144//		if (y == -2) {...}145// }146// Suppose we call f(-1), then we'll see a comparison 0xffff vs 0xfffe and be147// unable to match input vs any operands. Thus we sign extend the input and148// check the extension.149// As with shrink we ignore cases when the other operand is wider.150// Note that executor sign extends all the comparison operands to int64.151// ======================================================================152func shrinkExpand(v uint64, compMap CompMap) []uint64 {153	var replacers map[uint64]bool154	for _, iwidth := range []int{8, 4, 2, 1, -4, -2, -1} {155		var width int156		var size, mutant uint64157		if iwidth > 0 {158			width = iwidth159			size = uint64(width) * 8160			mutant = v & ((1 << size) - 1)161		} else {162			width = -iwidth163			size = uint64(width) * 8164			mutant = v | ^((1 << size) - 1)165		}166		// Use big-endian match/replace for both blobs and ints....

shrinkExpand

Using AI Code Generation

1import "fmt"2func main() {3    p.shrinkExpand()4}5import "fmt"6type prog struct {7}8func (p *prog) shrinkExpand() {9    fmt.Println("ShrinkExpand")10}

shrinkExpand

Using AI Code Generation

1public class Main{2	public static void main(String[] args){3		Prog p = new Prog();4		p.shrinkExpand();5	}6}7import "fmt"8type Prog struct {9}10func (p *Prog) ShrinkExpand() {11	fmt.Println("Hello World")12}13func main() {14	p := Prog{}15	p.ShrinkExpand()16}17import (18type Prog struct {19}20func (p *Prog) ShrinkExpand() {21	fmt.Println("Hello World")22}23func main() {24	p := Prog{}25	p.ShrinkExpand()26}

shrinkExpand

Using AI Code Generation

1import "fmt"2func main() {3    fmt.Println("Hello, playground")4    p.shrinkExpand()5}6import "fmt"7type prog struct {8}9func (p *prog) shrinkExpand() {10    fmt.Println("Hello, playground")11}

shrinkExpand

Using AI Code Generation

1import (2func main() {3	fmt.Println("Hello, playground")4	x := prog.Prog{10, 20, 30}5	x.ShrinkExpand()6	fmt.Println(x)7}8import "fmt"9type Prog struct {10}11func (p *Prog) ShrinkExpand() {12	fmt.Println("shrunk")13	fmt.Println("expanded")14}15In the above code, the main() function is in the package main and the prog class is in the package prog. The prog class is in a subdirectory named prog. This is how the directory structure looks like:16The main() function is in the main package and the prog class is in the prog package. The prog class is in a subdirectory named prog. This is how the directory structure looks like:17The main() function is in the main package and the prog class is in the prog package. The prog class is in a subdirectory named prog. This is how the directory structure looks like:18The main() function is in the main package and the prog class is in the prog package. The prog class is in a subdirectory named prog. This is how the directory structure looks like:

shrinkExpand

Using AI Code Generation

1import (2func main() {3    p.shrinkExpand()4}5type prog struct {6}7func (p prog) shrinkExpand() {8    fmt.Println("Hello")9}

shrinkExpand

Using AI Code Generation

1import (2func main() {3	p := prog{1, 2, 3, 4, 5}4	fmt.Println(p)5	p.shrinkExpand()6	fmt.Println(p)7}8{1 2 3 4 5}9{2 4 6 8 10}10import (11func main() {12	p := prog{1, 2, 3, 4, 5}13	fmt.Println(p)14	p.shrinkExpand()15	fmt.Println(p)16}17type prog struct {18}19func (p *prog) shrinkExpand() {20}21{1 2 3 4 5}22{2 4 6 8 10}23import (24func main() {25	p := prog{1, 2, 3, 4, 5}26	fmt.Println(p)

shrinkExpand

Using AI Code Generation

1import (2func main() {3	prog1 := prog{}4	prog1.shrinkExpand()5}6type prog struct {7}8func (prog1 prog) shrinkExpand() {9	slice := []byte(s)10	fmt.Println(string(slice))11	fmt.Println(string(slice))12	fmt.Println(string(slice))13}14The syntax of the strings.Fields() method is:15strings.Fields(s string) []string16Here is the code to use the strings.Fields() method:17import (18func main() {19	slice := strings.Fields(s)20	fmt.Println(slice)21}22The syntax of the strings.FieldsFunc() method is:23strings.FieldsFunc(s string, f func(rune) bool) []string24Here is the code to use the strings.FieldsFunc() method:

shrinkExpand

Using AI Code Generation

1import "fmt"2func main() {3    p := prog{}4    p.shrinkExpand()5}6Go | Shrink and Expand a Slice using copy()7Go | Remove Duplicates from Slice using Shrink and Expand using copy()8Go | Shrink and Expand a Slice using append()9Go | Remove Duplicates from Slice using Shrink and Expand using append()10Go | Shrink and Expand a Slice using copy() and append()11Go | Remove Duplicates from Slice using Shrink and Expand using copy() and append()12Go | Shrink and Expand a Slice using copy() and append() with a single loop13Go | Remove Duplicates from Slice using Shrink and Expand using copy() and append() with a single loop14Go | Shrink and Expand a Slice using copy() and append() with a single loop and a single function15Go | Remove Duplicates from Slice using Shrink and Expand using copy() and append() with a single loop and a single function16Go | Shrink and Expand a Slice using copy() and append() with a single loop and a single function to remove duplicates17Go | Remove Duplicates from Slice using Shrink and Expand using copy() and append() with a single loop and a single function to remove duplicates18Go | Shrink and Expand a Slice using copy() and append() with a single loop and a single function to remove duplicates and sort19Go | Remove Duplicates from Slice using Shrink and Expand using copy() and append() with a single loop and a single function to remove duplicates and sort20Go | Shrink and Expand a Slice using copy() and append() with a single loop and a single function to remove duplicates and sort and reverse21Go | Remove Duplicates from Slice using Shrink and Expand using copy() and append() with a single loop and a

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