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How to use collectUnused method of compiler Package

Best Syzkaller code snippet using compiler.collectUnused

compiler_test.go

Source:compiler_test.go

1// Copyright 2017 syzkaller project authors. All rights reserved.2// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.3package compiler4import (5	"bytes"6	"flag"7	"fmt"8	"io/ioutil"9	"path/filepath"10	"reflect"11	"sort"12	"testing"13	"github.com/google/syzkaller/pkg/ast"14	"github.com/google/syzkaller/pkg/serializer"15	"github.com/google/syzkaller/sys/targets"16)17var flagUpdate = flag.Bool("update", false, "reformat all.txt")18func TestCompileAll(t *testing.T) {19	for os, arches := range targets.List {20		os, arches := os, arches21		t.Run(os, func(t *testing.T) {22			t.Parallel()23			eh := func(pos ast.Pos, msg string) {24				t.Logf("%v: %v", pos, msg)25			}26			path := filepath.Join("..", "..", "sys", os)27			desc := ast.ParseGlob(filepath.Join(path, "*.txt"), eh)28			if desc == nil {29				t.Fatalf("parsing failed")30			}31			for arch, target := range arches {32				arch, target := arch, target33				t.Run(arch, func(t *testing.T) {34					t.Parallel()35					errors := new(bytes.Buffer)36					eh := func(pos ast.Pos, msg string) {37						fmt.Fprintf(errors, "%v: %v\n", pos, msg)38					}39					defer func() {40						t.Logf("\n%s", errors.Bytes())41					}()42					consts := DeserializeConstFile(filepath.Join(path, "*.const"), eh).Arch(arch)43					if consts == nil {44						t.Fatalf("reading consts failed")45					}46					prog := Compile(desc, consts, target, eh)47					if prog == nil {48						t.Fatalf("compilation failed")49					}50				})51			}52		})53	}54}55func TestData(t *testing.T) {56	t.Parallel()57	// Compile the canned descriptions in testdata and match expected errors.58	// Errors are produced in batches in different compilation phases.59	// If one phase produces errors, subsequent phases are not executed.60	// E.g. if we failed to parse descriptions, we won't run type checking at all.61	// Because of this we have one file per phase.62	for _, name := range []string{"errors.txt", "errors2.txt", "errors3.txt", "warnings.txt", "all.txt"} {63		for _, arch := range []string{targets.TestArch32Shmem, targets.TestArch64} {64			name, arch := name, arch65			t.Run(fmt.Sprintf("%v/%v", name, arch), func(t *testing.T) {66				t.Parallel()67				target := targets.List[targets.TestOS][arch]68				fileName := filepath.Join("testdata", name)69				em := ast.NewErrorMatcher(t, fileName)70				astDesc := ast.Parse(em.Data, name, em.ErrorHandler)71				if astDesc == nil {72					em.DumpErrors()73					t.Fatalf("parsing failed")74				}75				constInfo := ExtractConsts(astDesc, target, em.ErrorHandler)76				if name == "errors.txt" {77					em.Check()78					return79				}80				if constInfo == nil {81					em.DumpErrors()82					t.Fatalf("const extraction failed")83				}84				consts := map[string]uint64{85					"SYS_foo": 1,86					"C0":      0,87					"C1":      1,88					"C2":      2,89					"U8_MAX":  0xff,90					"U16_MAX": 0xffff,91				}92				FabricateSyscallConsts(target, constInfo, consts)93				delete(consts, "SYS_unsupported")94				desc := Compile(astDesc, consts, target, em.ErrorHandler)95				if name == "errors2.txt" || name == "errors3.txt" {96					em.Check()97					return98				}99				if desc == nil {100					em.DumpErrors()101					t.Fatalf("compilation failed")102				}103				if name == "warnings.txt" {104					em.Check()105					return106				}107				if formatted := ast.Format(astDesc); !bytes.Equal(em.Data, formatted) {108					if *flagUpdate {109						ioutil.WriteFile(fileName, formatted, 0644)110					}111					t.Fatalf("description is not formatted")112				}113				if len(desc.Unsupported) != 0 {114					t.Fatalf("something is unsupported:\n%+v", desc.Unsupported)115				}116				out := new(bytes.Buffer)117				fmt.Fprintf(out, "\n\nRESOURCES:\n")118				serializer.Write(out, desc.Resources)119				fmt.Fprintf(out, "\n\nSYSCALLS:\n")120				serializer.Write(out, desc.Syscalls)121				if false {122					t.Log(out.String()) // useful for debugging123				}124			})125		}126	}127}128func TestFuzz(t *testing.T) {129	t.Parallel()130	for _, data := range []string{131		`132type H b[A]133type b[L] {134	m b[u:L]135	l b[z:L]136	m b[V:L]137	m b[0:L]138	H b[o:L]139}140`,141		`142type p b[L]143type b[L]{144	e b[3:L]145	e b[2:L]146	e b[1[L]]147	k b[H]148	k b[Q]149}`,150		"d~^gBÌ`i\u007f?\xb0.",151		"da[",152		"define\x98define(define\x98define\x98define\x98define\x98define)define\tdefin",153		"resource g[g]",154		`t[155l	t156]`,157		`t()D[0]158type D[e]l`,159		"E",160		"#",161		`162type p b[L]163type b[L] {164	e b[L[L]]165}`,166		`167p() b[len]168type b[b] b169`,170		`171p() b[len[opt]]172type b[b] b173`,174	} {175		Fuzz([]byte(data)[:len(data):len(data)])176	}177}178func TestAlign(t *testing.T) {179	t.Parallel()180	const input = `181foo$0(a ptr[in, s0])182s0 {183	f0	int8184	f1	int16185}186foo$1(a ptr[in, s1])187s1 {188	f0	ptr[in, s2, opt]189}190s2 {191	f1	s1192	f2	array[s1, 2]193	f3	array[array[s1, 2], 2]194}195	`196	eh := func(pos ast.Pos, msg string) {197		t.Errorf("%v: %v", pos, msg)198	}199	desc := ast.Parse([]byte(input), "input", eh)200	if desc == nil {201		t.Fatal("failed to parse")202	}203	p := Compile(desc, map[string]uint64{"SYS_foo": 1}, targets.List[targets.TestOS][targets.TestArch64], eh)204	if p == nil {205		t.Fatal("failed to compile")206	}207}208func TestCollectUnusedError(t *testing.T) {209	t.Parallel()210	const input = `211		s0 {212			f0 fidl_string213		}214        `215	nopErrorHandler := func(pos ast.Pos, msg string) {}216	desc := ast.Parse([]byte(input), "input", nopErrorHandler)217	if desc == nil {218		t.Fatal("failed to parse")219	}220	_, err := CollectUnused(desc, targets.List[targets.TestOS][targets.TestArch64], nopErrorHandler)221	if err == nil {222		t.Fatal("CollectUnused should have failed but didn't")223	}224}225func TestCollectUnused(t *testing.T) {226	t.Parallel()227	inputs := []struct {228		text  string229		names []string230	}{231		{232			text: `233				s0 {234					f0 string235				}236			`,237			names: []string{"s0"},238		},239		{240			text: `241				foo$0(a ptr[in, s0])242				s0 {243					f0	int8244					f1	int16245				}246			`,247			names: []string{},248		},249		{250			text: `251				s0 {252					f0	int8253					f1	int16254				}255				s1 {256					f2      int32257				}258				foo$0(a ptr[in, s0])259			`,260			names: []string{"s1"},261		},262	}263	for i, input := range inputs {264		desc := ast.Parse([]byte(input.text), "input", nil)265		if desc == nil {266			t.Fatalf("Test %d: failed to parse", i)267		}268		nodes, err := CollectUnused(desc, targets.List[targets.TestOS][targets.TestArch64], nil)269		if err != nil {270			t.Fatalf("Test %d: CollectUnused failed: %v", i, err)271		}272		if len(input.names) != len(nodes) {273			t.Errorf("Test %d: want %d nodes, got %d", i, len(input.names), len(nodes))274		}275		names := make([]string, len(nodes))276		for i := range nodes {277			_, _, names[i] = nodes[i].Info()278		}279		sort.Strings(names)280		sort.Strings(input.names)281		if !reflect.DeepEqual(names, input.names) {282			t.Errorf("Test %d: Unused nodes differ. Want %v, Got %v", i, input.names, names)283		}284	}285}...

collectUnused

Using AI Code Generation

1import (2func main() {3	f, err := parser.ParseFile(fset, "1.go", nil, parser.ParseComments)4	if err != nil {5		log.Fatal(err)6	}7	ast.Print(fset, f)8	fmt.Println("Unused variables are: ")9	c := compiler{}10	c.collectUnused(f)11}12import (13type compiler struct {14}15func (c *compiler) collectUnused(f *ast.File) {16	for _, decl := range f.Decls {17		switch decl := decl.(type) {18			for _, spec := range decl.Specs {19				switch spec := spec.(type) {20					if len(spec.Names) > 1 {21						for _, name := range spec.Names {22							fmt.Println(name.Name)23						}24					} else {25						fmt.Println(spec.Names[0].Name)26					}27					fmt.Println(spec.Name.Name)28				}29			}30			fmt.Println(decl.Name.Name)31		}32	}33}34import (35type File struct {

collectUnused

Using AI Code Generation

1import (2func main() {3	f, err := parser.ParseFile(fset, "1.go", nil, parser.ParseComments)4	if err != nil {5		log.Fatal(err)6	}7	fmt.Println("AST:")8	ast.Print(fset, f)9	fmt.Println("Unused variables:")10	for _, v := range collectUnused(f) {11		fmt.Printf("%s %s\n", v.Name, v.Type)12	}13}14func collectUnused(f *ast.File) []*ast.Field {15	ast.Inspect(f, func(n ast.Node) bool {16		switch x := n.(type) {17			if !ast.IsExported(x.Name.Name) {18			}19			ast.Inspect(x.Body, func(n ast.Node) bool {20				switch x := n.(type) {21					if x.Tok != token.ASSIGN {22					}23					for _, lhs := range x.Lhs {24						id, ok := lhs.(*ast.Ident)25						if !ok {26						}27						if !ast.IsExported(id.Name) {28						}29						if isUsed(id, x.Rhs) {30						}31						unused = append(unused, &ast.Field{32							Names: []*ast.Ident{id},33						})34					}35				}

collectUnused

Using AI Code Generation

1import (2func main() {3 f, err := parser.ParseFile(fset, "1.go", nil, 0)4 if err != nil {5 log.Fatal(err)6 }

collectUnused

Using AI Code Generation

1import (2func main() {3	src, err := parser.ParseFile(fset, "1.go", nil, parser.ParseComments)4	if err != nil {5		log.Fatal(err)6	}7	for _, s := range src.Imports {8		fmt.Println(s.Path.Value)9	}10	for _, c := range src.Comments {11		fmt.Println(c.Text())12	}13	ast.Inspect(src, func(n ast.Node) bool {14		switch x := n.(type) {15			fmt.Println(x.Name.Name)16			for _, spec := range x.Specs {17				switch spec := spec.(type) {18					fmt.Println(spec.Name.Name)19				}20			}21		}22	})23	for _, decl := range src.Decls {24		ast.Inspect(decl, func(n ast.Node) bool {25			switch x := n.(type) {26				fmt.Println(x.Name)27			}28		})29	}30	ast.Inspect(src, func(n ast.Node) bool {31		switch x := n.(type) {32			fmt.Println(x.Value)33		}34	})35	for _, g := range src.Comments {36		fmt.Println(g.Text())37	}38	for _, g := range src.Comments {39		fmt.Println(g.Text())40	}

collectUnused

Using AI Code Generation

1import (2func main() {3    fset := token.NewFileSet()4    node, err := parser.ParseFile(fset, "2.go", nil, parser.ParseComments)5    if err != nil {6        log.Fatal(err)7    }8    config := types.Config{Importer: importer.Default()}9    info := &types.Info{10        Scopes: make(map[ast.Node]*types.Scope),11    }12    _, err = config.Check("cmd/compile/internal/gc", fset, []*ast.File{node}, info)13    if err != nil {14        log.Fatal(err)15    }16    for id, obj := range info.Uses {17        if obj.Exported() && !info.Defs[id].(*types.TypeName).IsAlias() {18            fmt.Printf("%s: %s\n", fset.Position(id.Pos()), id.Name)19        }20    }21}22import (23func main() {24    fset := token.NewFileSet()25    node, err := parser.ParseFile(fset, "2.go", nil, parser.ParseComments)26    if err != nil {27        log.Fatal(err)28    }29    config := types.Config{Importer: importer.Default()}30    info := &types.Info{31        Scopes: make(map[ast.Node]*types.Scope),32    }33    _, err = config.Check("cmd/compile/internal/gc", fset, []*ast.File{node}, info)34    if err != nil {35        log.Fatal(err)36    }37    for id, obj := range info.Uses {38        if obj.Exported()

collectUnused

Using AI Code Generation

1import (2func main() {3	if len(os.Args) != 2 {4		log.Fatal("usage: 2.go <go file>")5	}6	fset := token.NewFileSet()7	f, err := parser.ParseFile(fset, os.Args[1], nil, 0)8	if err != nil {9		log.Fatal(err)10	}11	comp := compiler{fset: fset, f: f}12	comp.collectUnused()13	fmt.Println("Unused variables:")14	for _, v := range comp.unused {15		fmt.Printf("\t%s\n", v)16	}17}18import (19func main() {20	if len(os.Args) != 2 {21		log.Fatal("usage: 3.go <go file>")22	}23	fset := token.NewFileSet()24	f, err := parser.ParseFile(fset, os.Args[1], nil, 0)25	if err != nil {26		log.Fatal(err)27	}28	comp := compiler{fset: fset, f: f}29	comp.collectUnused()30	fmt.Println("Unused variables:")31	for _, v := range comp.unused {32		fmt.Printf("\t%s\n", v)33	}34}35import (36func main() {37	if len(os.Args) != 2 {38		log.Fatal("usage: 4.go <go file>")39	}40	fset := token.NewFileSet()41	f, err := parser.ParseFile(fset, os.Args[1], nil, 0)42	if err != nil {43		log.Fatal(err)44	}45	comp := compiler{fset: fset, f: f}46	comp.collectUnused()47	fmt.Println("Unused variables:")48	for _, v := range comp.unused {49		fmt.Printf("\t%s\n", v)50	}51}

collectUnused

Using AI Code Generation

1func main() {2    compiler := new(Compiler)3    compiler.collectUnused()4}5func main() {6    compiler := new(Compiler)7    compiler.collectUnused()8}9func main() {10    compiler := new(Compiler)11    compiler.collectUnused()12}13func main() {14    compiler := new(Compiler)15    compiler.collectUnused()16}17func main() {18    compiler := new(Compiler)19    compiler.collectUnused()20}21func main() {22    compiler := new(Compiler)23    compiler.collectUnused()24}25func main() {26    compiler := new(Compiler)27    compiler.collectUnused()28}29func main() {30    compiler := new(Compiler)31    compiler.collectUnused()32}33func main() {34    compiler := new(Compiler)35    compiler.collectUnused()36}37func main() {38    compiler := new(Compiler)

collectUnused

Using AI Code Generation

1import (2type Compiler struct {3}4func (c *Compiler) collectUnused() []string {5	for k, v := range c.variables {6		if v == "unused" {7			unusedVars = append(unusedVars, k)8		}9	}10}11func (c *Compiler) removeUnused() {12	unusedVars := c.collectUnused()13	for _, v := range unusedVars {14		delete(c.variables, v)15	}16}17func (c *Compiler) collectUsed() []string {18	for k, v := range c.variables {19		if v == "used" {20			usedVars = append(usedVars, k)21		}22	}23}24func (c *Compiler) removeUsed() {25	usedVars := c.collectUsed()26	for _, v := range usedVars {27		delete(c.variables, v)28	}29}30func (c *Compiler) checkDeclaration(line string) {31	variableDeclaration := regexp.MustCompile(`^var\s+[a-z]+[a-z0-9_]*\s+`)32	if variableDeclaration.MatchString(line) {33		variableName := variableDeclaration.FindString(line)34		variableName = strings.TrimSpace(variableName)35	}36}37func (c *Compiler) checkAssignment(line string) {38	variableAssignment := regexp.MustCompile(`^[a-z]+[a-z0-9_]*\s*=`)39	if variableAssignment.MatchString(line) {40		variableName := variableAssignment.FindString(line)41		variableName = strings.TrimSpace(variableName)42		variableName = variableName[:len(variableName)-1]

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