How to use init method of compiler Package

Best Syzkaller code snippet using compiler.init

compiler.go

Source:compiler.go

...69	SanitizerAttribute llvm.Attribute70	// Importer is the importer. If nil, the compiler will set this field71	// automatically using MakeImporter().72	Importer types.Importer73	// InitMap is the init map used by Importer. If Importer is nil, the74	// compiler will set this field automatically using MakeImporter().75	// If Importer is non-nil, InitMap must be non-nil also.76	InitMap map[*types.Package]gccgoimporter.InitData77	// PackageCreated is a hook passed to the go/loader package via78	// loader.Config, see the documentation for that package for more79	// information.80	PackageCreated func(*types.Package)81	// DisableUnusedImportCheck disables the unused import check performed82	// by go/types if set to true.83	DisableUnusedImportCheck bool84	// Packages is used by go/types as the imported package map if non-nil.85	Packages map[string]*types.Package86}87type Compiler struct {88	opts       CompilerOptions89	dataLayout string90}91func NewCompiler(opts CompilerOptions) (*Compiler, error) {92	compiler := &Compiler{opts: opts}93	dataLayout, err := llvmDataLayout(compiler.opts.TargetTriple)94	if err != nil {95		return nil, err96	}97	compiler.dataLayout = dataLayout98	return compiler, nil99}100func (c *Compiler) Compile(fset *token.FileSet, astFiles []*ast.File, importpath string) (m *Module, err error) {101	target := llvm.NewTargetData(c.dataLayout)102	compiler := &compiler{103		CompilerOptions: c.opts,104		dataLayout:      c.dataLayout,105		target:          target,106		llvmtypes:       NewLLVMTypeMap(llvm.GlobalContext(), target),107	}108	return compiler.compile(fset, astFiles, importpath)109}110type compiler struct {111	CompilerOptions112	module     *Module113	dataLayout string114	target     llvm.TargetData115	fileset    *token.FileSet116	runtime   *runtimeInterface117	llvmtypes *llvmTypeMap118	types     *TypeMap119	debug *debug.DIBuilder120}121func (c *compiler) logf(format string, v ...interface{}) {122	if c.Logger != nil {123		c.Logger.Printf(format, v...)124	}125}126func (c *compiler) addCommonFunctionAttrs(fn llvm.Value) {127	fn.AddTargetDependentFunctionAttr("disable-tail-calls", "true")128	fn.AddTargetDependentFunctionAttr("split-stack", "")129	if c.SanitizerAttribute.GetEnumKind() != 0 {130		fn.AddFunctionAttr(c.SanitizerAttribute)131	}132}133// MakeImporter sets CompilerOptions.Importer to an appropriate importer134// for the search paths given in CompilerOptions.ImportPaths, and sets135// CompilerOptions.InitMap to an init map belonging to that importer.136// If CompilerOptions.GccgoPath is non-empty, the importer will also use137// the search paths for that gccgo installation.138func (opts *CompilerOptions) MakeImporter() error {139	opts.InitMap = make(map[*types.Package]gccgoimporter.InitData)140	if opts.GccgoPath == "" {141		paths := append(append([]string{}, opts.ImportPaths...), ".")142		opts.Importer = gccgoimporter.GetImporter(paths, opts.InitMap)143	} else {144		var inst gccgoimporter.GccgoInstallation145		err := inst.InitFromDriver(opts.GccgoPath)146		if err != nil {147			return err148		}149		opts.Importer = inst.GetImporter(opts.ImportPaths, opts.InitMap)150	}151	return nil152}153func (compiler *compiler) compile(fset *token.FileSet, astFiles []*ast.File, importpath string) (m *Module, err error) {154	buildctx, err := llgobuild.ContextFromTriple(compiler.TargetTriple)155	if err != nil {156		return nil, err157	}158	if compiler.Importer == nil {159		err = compiler.MakeImporter()160		if err != nil {161			return nil, err162		}163	}164	impcfg := &loader.Config{165		Fset: fset,166		TypeChecker: types.Config{167			Packages: compiler.Packages,168			Import:   compiler.Importer,169			Sizes:    compiler.llvmtypes,170			DisableUnusedImportCheck: compiler.DisableUnusedImportCheck,171		},172		ImportFromBinary: true,173		Build:            &buildctx.Context,174		PackageCreated:   compiler.PackageCreated,175	}176	// If no import path is specified, then set the import177	// path to be the same as the package's name.178	if importpath == "" {179		importpath = astFiles[0].Name.String()180	}181	impcfg.CreateFromFiles(importpath, astFiles...)182	iprog, err := impcfg.Load()183	if err != nil {184		return nil, err185	}186	program := ssa.Create(iprog, ssa.BareInits)187	mainPkginfo := iprog.InitialPackages()[0]188	mainPkg := program.CreatePackage(mainPkginfo)189	// Create a Module, which contains the LLVM module.190	modulename := importpath191	compiler.module = &Module{Module: llvm.NewModule(modulename), Path: modulename, Package: mainPkg.Object}192	compiler.module.SetTarget(compiler.TargetTriple)193	compiler.module.SetDataLayout(compiler.dataLayout)194	// Create a new translation unit.195	unit := newUnit(compiler, mainPkg)196	// Create the runtime interface.197	compiler.runtime, err = newRuntimeInterface(compiler.module.Module, compiler.llvmtypes)198	if err != nil {199		return nil, err200	}201	mainPkg.Build()202	// Create a struct responsible for mapping static types to LLVM types,203	// and to runtime/dynamic type values.204	compiler.types = NewTypeMap(205		mainPkg,206		compiler.llvmtypes,207		compiler.module.Module,208		compiler.runtime,209		MethodResolver(unit),210	)211	if compiler.GenerateDebug {212		compiler.debug = debug.NewDIBuilder(213			types.Sizes(compiler.llvmtypes),214			compiler.module.Module,215			impcfg.Fset,216			compiler.DebugPrefixMaps,217		)218		defer compiler.debug.Destroy()219		defer compiler.debug.Finalize()220	}221	unit.translatePackage(mainPkg)222	compiler.processAnnotations(unit, mainPkginfo)223	if importpath == "main" {224		compiler.createInitMainFunction(mainPkg)225	} else {226		compiler.module.ExportData = compiler.buildExportData(mainPkg)227	}228	return compiler.module, nil229}230type byPriorityThenFunc []gccgoimporter.PackageInit231func (a byPriorityThenFunc) Len() int      { return len(a) }232func (a byPriorityThenFunc) Swap(i, j int) { a[i], a[j] = a[j], a[i] }233func (a byPriorityThenFunc) Less(i, j int) bool {234	switch {235	case a[i].Priority < a[j].Priority:236		return true237	case a[i].Priority > a[j].Priority:238		return false239	case a[i].InitFunc < a[j].InitFunc:240		return true241	default:242		return false243	}244}245func (c *compiler) buildPackageInitData(mainPkg *ssa.Package) gccgoimporter.InitData {246	var inits []gccgoimporter.PackageInit247	for _, imp := range mainPkg.Object.Imports() {248		inits = append(inits, c.InitMap[imp].Inits...)249	}250	sort.Sort(byPriorityThenFunc(inits))251	// Deduplicate init entries. We want to preserve the entry with the highest priority.252	// Normally a package's priorities will be consistent among its dependencies, but it is253	// possible for them to be different. For example, if a standard library test augments a254	// package which is a dependency of 'regexp' (which is imported by every test main package)255	// with additional dependencies, those dependencies may cause the package under test to256	// receive a higher priority than indicated by its init clause in 'regexp'.257	uniqinits := make([]gccgoimporter.PackageInit, len(inits))258	uniqinitpos := len(inits)259	uniqinitnames := make(map[string]struct{})260	for i, _ := range inits {261		init := inits[len(inits)-1-i]262		if _, ok := uniqinitnames[init.InitFunc]; !ok {263			uniqinitnames[init.InitFunc] = struct{}{}264			uniqinitpos--265			uniqinits[uniqinitpos] = init266		}267	}268	uniqinits = uniqinits[uniqinitpos:]269	ourprio := 1270	if len(uniqinits) != 0 {271		ourprio = uniqinits[len(uniqinits)-1].Priority + 1272	}273	if imp := mainPkg.Func("init"); imp != nil {274		impname := c.types.mc.mangleFunctionName(imp)275		uniqinits = append(uniqinits, gccgoimporter.PackageInit{mainPkg.Object.Name(), impname, ourprio})276	}277	return gccgoimporter.InitData{ourprio, uniqinits}278}279func (c *compiler) createInitMainFunction(mainPkg *ssa.Package) {280	int8ptr := llvm.PointerType(c.types.ctx.Int8Type(), 0)281	ftyp := llvm.FunctionType(llvm.VoidType(), []llvm.Type{int8ptr}, false)282	initMain := llvm.AddFunction(c.module.Module, "__go_init_main", ftyp)283	c.addCommonFunctionAttrs(initMain)284	entry := llvm.AddBasicBlock(initMain, "entry")285	builder := llvm.GlobalContext().NewBuilder()286	defer builder.Dispose()287	builder.SetInsertPointAtEnd(entry)288	args := []llvm.Value{llvm.Undef(int8ptr)}289	if !c.GccgoABI {290		initfn := c.module.Module.NamedFunction("main..import")291		if !initfn.IsNil() {292			builder.CreateCall(initfn, args, "")293		}294		builder.CreateRetVoid()295		return296	}297	initdata := c.buildPackageInitData(mainPkg)298	for _, init := range initdata.Inits {299		initfn := c.module.Module.NamedFunction(init.InitFunc)300		if initfn.IsNil() {301			initfn = llvm.AddFunction(c.module.Module, init.InitFunc, ftyp)302		}303		builder.CreateCall(initfn, args, "")304	}305	builder.CreateRetVoid()306}307func (c *compiler) buildExportData(mainPkg *ssa.Package) []byte {308	exportData := importer.ExportData(mainPkg.Object)309	b := bytes.NewBuffer(exportData)310	b.WriteString("v1;\n")311	if !c.GccgoABI {312		return b.Bytes()313	}314	initdata := c.buildPackageInitData(mainPkg)315	b.WriteString("priority ")316	b.WriteString(strconv.Itoa(initdata.Priority))317	b.WriteString(";\n")318	if len(initdata.Inits) != 0 {319		b.WriteString("init")320		for _, init := range initdata.Inits {321			b.WriteRune(' ')322			b.WriteString(init.Name)323			b.WriteRune(' ')324			b.WriteString(init.InitFunc)325			b.WriteRune(' ')326			b.WriteString(strconv.Itoa(init.Priority))327		}328		b.WriteString(";\n")329	}330	return b.Bytes()331}332// vim: set ft=go :...

init

Using AI Code Generation

1import "fmt"2func main() {3	fmt.Println("Hello World")4}5import "fmt"6func main() {7	fmt.Println("Hello World")8}9import "fmt"10func main() {11	fmt.Println("Hello World")12}13import "fmt"14func main() {15	fmt.Println("Hello World")16}17import "fmt"18func main() {19	fmt.Println("Hello World")20}21import "fmt"22func main() {23	fmt.Println("Hello World")24}25import "fmt"26func main() {27	fmt.Println("Hello World")28}29import "fmt"30func main() {31	fmt.Println("Hello World")32}33import "fmt"34func main() {35	fmt.Println("Hello World")36}37import "fmt"38func main() {39	fmt.Println("Hello World")40}41import "fmt"42func main() {43	fmt.Println("Hello World")44}45import "fmt"46func main() {47	fmt.Println("Hello World")48}49import "fmt"50func main() {51	fmt.Println("Hello World")52}53import "fmt"54func main() {55	fmt.Println("Hello World")56}57import "fmt"58func main() {59	fmt.Println("Hello World")60}

init

Using AI Code Generation

1import (2func main() {3	fmt.Println(runtime.Compiler)4}5import (6func main() {7	fmt.Println(runtime.GOOS)8	fmt.Println(runtime.GOARCH)9}10import (11func main() {12	fmt.Println(runtime.NumCPU())13}14import (15func main() {16	fmt.Println(runtime.NumCgoCall())17}18import (19func main() {20	fmt.Println(runtime.NumGoroutine())21}22import (23func main() {24	fmt.Println(runtime.GOMAXPROCS(4))25}26import (27func main() {28	fmt.Println(runtime.GOEXPERIMENT)29}30import (31func main() {32	fmt.Println(runtime.GO111MODULE)33}34import (35func main() {36	fmt.Println(runtime.GOFLAGS)37}38import (39func main() {40	fmt.Println(runtime.GOGC)41}42import (43func main() {44	fmt.Println(runtime.GODEBUG)45}46import (47func main() {48	fmt.Println(runtime.GOMODCACHE)49}

init

Using AI Code Generation

1import "fmt"2func main() {3    fmt.Println("Go is awesome!")4}5import "fmt"6func main() {7    fmt.Println("Go is awesome!")8}

init

Using AI Code Generation

1import (2type Compiler struct {3}4func (c *Compiler) init() {5}6func main() {7	c = new(Compiler)8	fmt.Println(reflect.TypeOf(c))9	fmt.Println(c.Language)10}11When we uncomment the line c.init() , the output will be:122. init() method with multiple files133. init() method with multiple packages144. init() method with multiple init() methods155. init() method with multiple init() methods in different packages166. init() method with multiple init() methods in different files of same package177. init() method with multiple init() methods in different packages and different files of same package188. init() method with multiple init() methods in different packages and different files of same package and different struct types19If we have multiple init() methods in different packages and different files of same package and different struct types, the init() method will be called in the order the packages are imported in the main.go

init

Using AI Code Generation

1import (2func main() {3    fmt.Println("Number of CPU's: ", runtime.NumCPU())4}5import (6func main() {7    fmt.Println("Number of CPU's: ", runtime.NumCPU())8    fmt.Println("Number of Goroutines: ", runtime.NumGoroutine())9}10import (11func main() {12    fmt.Println("Number of CPU's: ", runtime.NumCPU())13    fmt.Println("Number of Goroutines: ", runtime.NumGoroutine())14    go func() {15        fmt.Println("Hello from Go Routine")16    }()17    fmt.Println("Number of Goroutines: ", runtime.NumGoroutine())18}19import (20func main() {21    fmt.Println("Number of CPU's: ", runtime.NumCPU())22    fmt.Println("Number of Goroutines: ", runtime.NumGoroutine())23    go func() {24        fmt.Println("Hello from Go Routine")25    }()26    fmt.Println("Number

init

Using AI Code Generation

1import "fmt"2type compiler struct {3}4func (c compiler) compile() {5	fmt.Println("Compiling the code using",c.name,"version",c.version)6}7func (c compiler) execute() {8	fmt.Println("Executing the code using",c.name,"version",c.version)9}10func main() {11	c := compiler{name: "Go", version: "1.14.1"}12	c.compile()13	c.execute()14}15func (r receiver_type) method_name(parameters) return_type {16}17func (r *receiver_type) method_name(parameters) return_type {18}

init

Using AI Code Generation

1import "fmt"2func main() {3   fmt.Println("Hello, World!")4}5import "fmt"6func main() {7   fmt.Println("Hello, World!")8}9func init() {10   fmt.Println("init called")11}

init

Using AI Code Generation

1import "fmt"2func main() {3    fmt.Println("Hello, World!")4}5Go: init() Method6func init() {7}8import "fmt"9func init() {10    fmt.Println("Hello, World!")11}12func main() {13    fmt.Println("Hello, World!")14}15Go: init() Method with Multiple Files16func init() {17}18import "fmt"19func init() {20    fmt.Println("Hello, World!")21}22func main() {23    fmt.Println("Hello, World!")24}25Go: init() Method with Multiple Files26func init() {27}28import "fmt"29func init() {30    fmt.Println("Hello, World!")31}32func main() {33    fmt.Println("Hello, World!")34}35Go: init() Method with Multiple Files36func init() {37}38import "fmt"39func init() {40    fmt.Println("Hello, World!")41}

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