How to use Alloc method of prog Package

Best Syzkaller code snippet using prog.Alloc

plist.go

Source:plist.go

...10type Plist struct {11	Firstpc *Prog12	Curfn   interface{} // holds a *gc.Node, if non-nil13}14// ProgAlloc is a function that allocates Progs.15// It is used to provide access to cached/bulk-allocated Progs to the assemblers.16type ProgAlloc func() *Prog17func Flushplist(ctxt *Link, plist *Plist, newprog ProgAlloc, myimportpath string) {18	// Build list of symbols, and assign instructions to lists.19	var curtext *LSym20	var etext *Prog21	var text []*LSym22	var plink *Prog23	for p := plist.Firstpc; p != nil; p = plink {24		if ctxt.Debugasm > 0 && ctxt.Debugvlog {25			fmt.Printf("obj: %v\n", p)26		}27		plink = p.Link28		p.Link = nil29		switch p.As {30		case AEND:31			continue32		case ATEXT:33			s := p.From.Sym34			if s == nil {35				// func _() { }36				curtext = nil37				continue38			}39			text = append(text, s)40			etext = p41			curtext = s42			continue43		case AFUNCDATA:44			// Rewrite reference to go_args_stackmap(SB) to the Go-provided declaration information.45			if curtext == nil { // func _() {}46				continue47			}48			if p.To.Sym.Name == "go_args_stackmap" {49				if p.From.Type != TYPE_CONST || p.From.Offset != objabi.FUNCDATA_ArgsPointerMaps {50					ctxt.Diag("FUNCDATA use of go_args_stackmap(SB) without FUNCDATA_ArgsPointerMaps")51				}52				p.To.Sym = ctxt.LookupDerived(curtext, curtext.Name+".args_stackmap")53			}54		}55		if curtext == nil {56			etext = nil57			continue58		}59		etext.Link = p60		etext = p61	}62	if newprog == nil {63		newprog = ctxt.NewProg64	}65	// Add reference to Go arguments for C or assembly functions without them.66	for _, s := range text {67		if !strings.HasPrefix(s.Name, "\"\".") {68			continue69		}70		found := false71		for p := s.Func().Text; p != nil; p = p.Link {72			if p.As == AFUNCDATA && p.From.Type == TYPE_CONST && p.From.Offset == objabi.FUNCDATA_ArgsPointerMaps {73				found = true74				break75			}76		}77		if !found {78			p := Appendp(s.Func().Text, newprog)79			p.As = AFUNCDATA80			p.From.Type = TYPE_CONST81			p.From.Offset = objabi.FUNCDATA_ArgsPointerMaps82			p.To.Type = TYPE_MEM83			p.To.Name = NAME_EXTERN84			p.To.Sym = ctxt.LookupDerived(s, s.Name+".args_stackmap")85		}86	}87	// Turn functions into machine code images.88	for _, s := range text {89		mkfwd(s)90		linkpatch(ctxt, s, newprog)91		ctxt.Arch.Preprocess(ctxt, s, newprog)92		ctxt.Arch.Assemble(ctxt, s, newprog)93		if ctxt.Errors > 0 {94			continue95		}96		linkpcln(ctxt, s)97		if myimportpath != "" {98			ctxt.populateDWARF(plist.Curfn, s, myimportpath)99		}100	}101}102func (ctxt *Link) InitTextSym(s *LSym, flag int) {103	if s == nil {104		// func _() { }105		return106	}107	if s.Func() != nil {108		ctxt.Diag("InitTextSym double init for %s", s.Name)109	}110	s.NewFuncInfo()111	if s.OnList() {112		ctxt.Diag("symbol %s listed multiple times", s.Name)113	}114	name := strings.Replace(s.Name, "\"\"", ctxt.Pkgpath, -1)115	s.Func().FuncID = objabi.GetFuncID(name, flag&WRAPPER != 0)116	s.Set(AttrOnList, true)117	s.Set(AttrDuplicateOK, flag&DUPOK != 0)118	s.Set(AttrNoSplit, flag&NOSPLIT != 0)119	s.Set(AttrReflectMethod, flag&REFLECTMETHOD != 0)120	s.Set(AttrWrapper, flag&WRAPPER != 0)121	s.Set(AttrNeedCtxt, flag&NEEDCTXT != 0)122	s.Set(AttrNoFrame, flag&NOFRAME != 0)123	s.Set(AttrTopFrame, flag&TOPFRAME != 0)124	s.Type = objabi.STEXT125	ctxt.Text = append(ctxt.Text, s)126	// Set up DWARF entries for s127	ctxt.dwarfSym(s)128}129func (ctxt *Link) Globl(s *LSym, size int64, flag int) {130	if s.OnList() {131		ctxt.Diag("symbol %s listed multiple times", s.Name)132	}133	s.Set(AttrOnList, true)134	ctxt.Data = append(ctxt.Data, s)135	s.Size = size136	if s.Type == 0 {137		s.Type = objabi.SBSS138	}139	if flag&DUPOK != 0 {140		s.Set(AttrDuplicateOK, true)141	}142	if flag&RODATA != 0 {143		s.Type = objabi.SRODATA144	} else if flag&NOPTR != 0 {145		if s.Type == objabi.SDATA {146			s.Type = objabi.SNOPTRDATA147		} else {148			s.Type = objabi.SNOPTRBSS149		}150	} else if flag&TLSBSS != 0 {151		s.Type = objabi.STLSBSS152	}153	if strings.HasPrefix(s.Name, "\"\"."+StaticNamePref) {154		s.Set(AttrStatic, true)155	}156}157// EmitEntryLiveness generates PCDATA Progs after p to switch to the158// liveness map active at the entry of function s. It returns the last159// Prog generated.160func (ctxt *Link) EmitEntryLiveness(s *LSym, p *Prog, newprog ProgAlloc) *Prog {161	pcdata := ctxt.EmitEntryStackMap(s, p, newprog)162	pcdata = ctxt.EmitEntryUnsafePoint(s, pcdata, newprog)163	return pcdata164}165// Similar to EmitEntryLiveness, but just emit stack map.166func (ctxt *Link) EmitEntryStackMap(s *LSym, p *Prog, newprog ProgAlloc) *Prog {167	pcdata := Appendp(p, newprog)168	pcdata.Pos = s.Func().Text.Pos169	pcdata.As = APCDATA170	pcdata.From.Type = TYPE_CONST171	pcdata.From.Offset = objabi.PCDATA_StackMapIndex172	pcdata.To.Type = TYPE_CONST173	pcdata.To.Offset = -1 // pcdata starts at -1 at function entry174	return pcdata175}176// Similar to EmitEntryLiveness, but just emit unsafe point map.177func (ctxt *Link) EmitEntryUnsafePoint(s *LSym, p *Prog, newprog ProgAlloc) *Prog {178	pcdata := Appendp(p, newprog)179	pcdata.Pos = s.Func().Text.Pos180	pcdata.As = APCDATA181	pcdata.From.Type = TYPE_CONST182	pcdata.From.Offset = objabi.PCDATA_UnsafePoint183	pcdata.To.Type = TYPE_CONST184	pcdata.To.Offset = -1185	return pcdata186}187// StartUnsafePoint generates PCDATA Progs after p to mark the188// beginning of an unsafe point. The unsafe point starts immediately189// after p.190// It returns the last Prog generated.191func (ctxt *Link) StartUnsafePoint(p *Prog, newprog ProgAlloc) *Prog {192	pcdata := Appendp(p, newprog)193	pcdata.As = APCDATA194	pcdata.From.Type = TYPE_CONST195	pcdata.From.Offset = objabi.PCDATA_UnsafePoint196	pcdata.To.Type = TYPE_CONST197	pcdata.To.Offset = objabi.PCDATA_UnsafePointUnsafe198	return pcdata199}200// EndUnsafePoint generates PCDATA Progs after p to mark the end of an201// unsafe point, restoring the register map index to oldval.202// The unsafe point ends right after p.203// It returns the last Prog generated.204func (ctxt *Link) EndUnsafePoint(p *Prog, newprog ProgAlloc, oldval int64) *Prog {205	pcdata := Appendp(p, newprog)206	pcdata.As = APCDATA207	pcdata.From.Type = TYPE_CONST208	pcdata.From.Offset = objabi.PCDATA_UnsafePoint209	pcdata.To.Type = TYPE_CONST210	pcdata.To.Offset = oldval211	return pcdata212}213// MarkUnsafePoints inserts PCDATAs to mark nonpreemptible and restartable214// instruction sequences, based on isUnsafePoint and isRestartable predicate.215// p0 is the start of the instruction stream.216// isUnsafePoint(p) returns true if p is not safe for async preemption.217// isRestartable(p) returns true if we can restart at the start of p (this Prog)218// upon async preemption. (Currently multi-Prog restartable sequence is not219// supported.)220// isRestartable can be nil. In this case it is treated as always returning false.221// If isUnsafePoint(p) and isRestartable(p) are both true, it is treated as222// an unsafe point.223func MarkUnsafePoints(ctxt *Link, p0 *Prog, newprog ProgAlloc, isUnsafePoint, isRestartable func(*Prog) bool) {224	if isRestartable == nil {225		// Default implementation: nothing is restartable.226		isRestartable = func(*Prog) bool { return false }227	}228	prev := p0229	prevPcdata := int64(-1) // entry PC data value230	prevRestart := int64(0)231	for p := prev.Link; p != nil; p, prev = p.Link, p {232		if p.As == APCDATA && p.From.Offset == objabi.PCDATA_UnsafePoint {233			prevPcdata = p.To.Offset234			continue235		}236		if prevPcdata == objabi.PCDATA_UnsafePointUnsafe {237			continue // already unsafe...

collector.go

Source:collector.go

...18	pattern    string19	prog       *ssa.Program20	handlerMap map[*ssa.Call]map[string]*ssa.Function21}22func (c *Collector) extractFREHandlers(root *ssa.Alloc) map[string]*ssa.Function {23	fa := (*root.Referrers())[1].(*ssa.FieldAddr)24	st := (*fa.Referrers())[0].(*ssa.Store)25	allocHandler := st.Val.(*ssa.MakeInterface).X.(*ssa.UnOp).X.(*ssa.Alloc)26	return c.extractREHandlers(allocHandler)27}28func (c *Collector) extractREHandlers(root *ssa.Alloc) map[string]*ssa.Function {29	m := map[string]*ssa.Function{}30	handlerType := func(s string) string {31		if strings.Contains(s, "AddFunc") {32			return "Add"33		} else if strings.Contains(s, "UpdateFunc") {34			return "Update"35		} else if strings.Contains(s, "DeleteFunc") {36			return "Delete"37		} else {38			return "Unknown"39		}40	}41	for _, instr := range *root.Referrers() {42		fa, ok := instr.(*ssa.FieldAddr)43		if !ok {44			continue45		}46		st := (*fa.Referrers())[0].(*ssa.Store)47		m[handlerType(fa.String())] = st.Val.(*ssa.MakeClosure).Fn.(*ssa.Function)48	}49	//fmt.Println(m)50	return m51}52func (c *Collector) extractHandlers(prog *ssa.Program, pattern string) map[*ssa.Call]map[string]*ssa.Function {53	m := map[*ssa.Call]map[string]*ssa.Function{}54	for _, pkg := range prog.AllPackages() {55		if pkg.Pkg.Path() == pattern {56			fun := pkg.Func("addAllEventHandlers") // Hardcoded here. Relax it later.57			//fun.WriteTo(os.Stdout)58			for _, block := range fun.Blocks {59				for _, instr := range block.Instrs {60					call, ok := instr.(*ssa.Call)61					if !ok {62						continue63					}64					if call.Common().IsInvoke() && call.Common().Method.Name() == "AddEventHandler" { // Hardcoded here. Relax it later.65						//fmt.Println(call)66						switch call.Common().Args[0].(type) {67						case *ssa.MakeInterface:68							mi := call.Common().Args[0].(*ssa.MakeInterface)69							allocHandler := mi.X.(*ssa.UnOp).X.(*ssa.Alloc)70							allocHandler.Pos()71							handlerType := allocHandler.Type().String()72							if strings.HasSuffix(handlerType, FREH) {73								//fmt.Println("handle FilteringResourceEventHandler")74								m[call] = c.extractFREHandlers(allocHandler)75							} else if strings.HasSuffix(handlerType, REH) {76								//fmt.Println("handle ResourceEventHandlerFunc")77								m[call] = c.extractREHandlers(allocHandler)78							}79						default:80							fmt.Println("doesn't support")81						}82					}83				}...

init.go

Source:init.go

...6)7func InitTarget(target *prog.Target) {8	arch := &arch{9		target:                 target,10		virtualAllocSyscall:    target.SyscallMap["VirtualAlloc"],11		MEM_COMMIT:             target.GetConst("MEM_COMMIT"),12		MEM_RESERVE:            target.GetConst("MEM_RESERVE"),13		PAGE_EXECUTE_READWRITE: target.GetConst("PAGE_EXECUTE_READWRITE"),14	}15	target.MakeDataMmap = arch.makeMmap16}17type arch struct {18	target              *prog.Target19	virtualAllocSyscall *prog.Syscall20	MEM_COMMIT             uint6421	MEM_RESERVE            uint6422	PAGE_EXECUTE_READWRITE uint6423}24func (arch *arch) makeMmap() []*prog.Call {25	meta := arch.virtualAllocSyscall26	size := arch.target.NumPages * arch.target.PageSize27	return []*prog.Call{28		{29			Meta: meta,30			Args: []prog.Arg{31				prog.MakeVmaPointerArg(meta.Args[0].Type, prog.DirIn, 0, size),32				prog.MakeConstArg(meta.Args[1].Type, prog.DirIn, size),33				prog.MakeConstArg(meta.Args[2].Type, prog.DirIn, arch.MEM_COMMIT|arch.MEM_RESERVE),34				prog.MakeConstArg(meta.Args[3].Type, prog.DirIn, arch.PAGE_EXECUTE_READWRITE),35			},36			Ret: prog.MakeReturnArg(meta.Ret),37		},38	}39}...

Alloc

Using AI Code Generation

1import (2func main() {3    f, err := os.Create("mem.prof")4    if err != nil {5        panic(err)6    }7    defer f.Close()8    p := pprof.Lookup("heap")9    if p == nil {10        panic("heap profile not available")11    }12    if err := p.WriteTo(f, 0); err != nil {13        panic(err)14    }15    fmt.Println("Memory profile written to mem.prof")16}17Entering interactive mode (type "help" for commands)183.05GB of 3.05GB total (  100%)19Dropped 1 nodes (cum <= 0.02GB)20Showing top 10 nodes out of 10 (cum >= 0.50GB)

Alloc

Using AI Code Generation

1import (2func main() {3	fmt.Println("NumCPU:", runtime.NumCPU())4	fmt.Println("NumGoroutine:", runtime.NumGoroutine())5	fmt.Println("GOMAXPROCS:", runtime.GOMAXPROCS(-1))6	fmt.Println("Alloc:", runtime.MemStats.Alloc)7	fmt.Println("TotalAlloc:", runtime.MemStats.TotalAlloc)8	fmt.Println("Sys:", runtime.MemStats.Sys)9	fmt.Println("NumGC:", runtime.MemStats.NumGC)10	for i := 0; i < 100; i++ {11		_ = make([]byte, 1000000)12	}13	fmt.Println("NumCPU:", runtime.NumCPU())14	fmt.Println("NumGoroutine:", runtime.NumGoroutine())15	fmt.Println("GOMAXPROCS:", runtime.GOMAXPROCS(-1))16	fmt.Println("Alloc:", runtime.MemStats.Alloc)17	fmt.Println("TotalAlloc:", runtime.MemStats.TotalAlloc)18	fmt.Println("Sys:", runtime.MemStats.Sys)19	fmt.Println("NumGC:", runtime.MemStats.NumGC)20}21import (22func main() {23	fmt.Println("NumCPU:", runtime.NumCPU())24	fmt.Println("NumGoroutine:", runtime.NumGoroutine())25	fmt.Println("GOMAXPROCS:", runtime.GOMAXPROCS(-1))26	fmt.Println("Alloc:", runtime.MemStats.Alloc)27	fmt.Println("TotalAlloc:", runtime.MemStats.TotalAlloc)28	fmt.Println("Sys:", runtime.MemStats.Sys)29	fmt.Println("NumGC:", runtime.MemStats.NumGC)30	for i := 0; i < 100; i++ {31		_ = make([]byte, 1000000)32	}33	fmt.Println("NumCPU:", runtime.NumCPU())34	fmt.Println("NumG

Alloc

Using AI Code Generation

1import "fmt"2func main() {3    p.alloc(100, 200)4    fmt.Println(p.a, p.b)5}6import "fmt"7func main() {8    p.alloc(100, 200)9    p.free()10    fmt.Println(p.a, p.b)11}12import "fmt"13func main() {14    p.alloc(100, 200)15    p.free()16    p.alloc(500, 600)17    fmt.Println(p.a, p.b)18}19import "fmt"20func main() {21    p.alloc(100, 200)22    p.free()23    p.alloc(500, 600)24    p.free()25    fmt.Println(p.a, p.b)26}27import "fmt"28func main() {29    p.alloc(100, 200)30    p.free()31    p.alloc(500, 600)32    p.free()33    p.alloc(700, 800)34    fmt.Println(p.a, p.b)35}36import "fmt"37func main() {38    p.alloc(100, 200)39    p.free()40    p.alloc(500, 600)41    p.free()42    p.alloc(700, 800)43    p.free()44    fmt.Println(p.a, p.b)45}46import "fmt"47func main() {48    p.alloc(100, 200)49    p.free()50    p.alloc(500, 600)51    p.free()52    p.alloc(700, 800)53    p.free()54    p.alloc(900, 1000)55    fmt.Println(p.a, p.b)56}57import

Alloc

Using AI Code Generation

1import (2func main() {3	p.Alloc(100)4	fmt.Printf("p is %v5}6import "fmt"7type Prog struct {8}9func (p *Prog) Alloc(n int) {10	fmt.Println("Alloc called")11}12type Prog struct {13}14The code in the prog package is compiled into a shared library. The main package can then import the prog package and use the Prog class. In this example, the main package imports the prog package and defines a new method called

Alloc

Using AI Code Generation

1import (2func main() {3	p = prog.NewProg()4	p.Alloc(10)5	fmt.Println("The value of p is ", p)6}7type Prog struct {8}9func NewProg() Prog {10	return Prog{0}11}12func (p *Prog) Alloc(i int) {13}14func (p *Prog) Alloc(i int) {15}16func NewProg() Prog {17	return Prog{0}18}19type Prog struct {20}21type Prog struct {22}23func NewProg() Prog {24	return Prog{0}25}26type Prog struct {27}28func NewProg() Prog {29	return Prog{0}30}31func (p *Prog) Alloc(i int) {32}33type Prog struct {34}35func NewProg() Prog {36	return Prog{0}37}38func (p *Prog) Alloc(i int) {39}40type Prog struct {41}42func NewProg() Prog {43	return Prog{0}44}45func (p *Prog) Alloc(i int) {46}47type Prog struct {48}49func NewProg() Prog {50	return Prog{0}51}52func (p *Prog) Alloc(i int) {53}

Alloc

Using AI Code Generation

1import (2func main() {3	fmt.Println("Length of slice:", len(slice))4	fmt.Println("Capacity of slice:", cap(slice))5	fmt.Println("Address of slice:", &slice[0])6	fmt.Println("Length of slice2:", len(slice2))7	fmt.Println("Capacity of slice2:", cap(slice2))8	fmt.Println("Address of slice2:", &slice2[0])9	fmt.Println("Length of slice3:", len(slice3))10	fmt.Println("Capacity of slice3:", cap(slice3))11	fmt.Println("Address of slice3:", &slice3[0])12	fmt.Println("Length of slice4:", len(slice4))13	fmt.Println("Capacity of slice4:", cap(slice4))14	fmt.Println("Address of slice4:", &slice4[0])15	fmt.Println("Length of slice5:", len(slice5))16	fmt.Println("Capacity of slice5:", cap(slice5))17	fmt.Println("Address of slice5:", &slice5[0])18	fmt.Println("Length of slice6:", len(slice6))19	fmt.Println("Capacity of slice6:", cap(slice6))

Alloc

Using AI Code Generation

1import (2func main() {3	fmt.Println(prog.Alloc(10))4}5import (6func main() {7	prog.Alloc(10)8	prog.Set(0, 1)9	fmt.Println(prog.Get(0))10}11import (12func main() {13	prog.Alloc(10)14	prog.Set(0, 1)15	fmt.Println(prog.Get(0))16}17import (18func main() {19	prog.Alloc(10)20	prog.Set(0, 1)21	fmt.Println(prog.Get(0))22}23import (24func main() {25	prog.Alloc(10)26	prog.Set(0, 1)27	fmt.Println(prog.Get(0))28}29import (30func main() {31	prog.Alloc(10)32	prog.Set(0, 1)33	fmt.Println(prog.Get(0))34}35import (

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.