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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 (

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