How to use check method of compiler Package

Best Syzkaller code snippet using compiler.check

compiler.go

Source:compiler.go

...118		}119	}120	return compiler.text[compiler.curr]121}122func (compiler *compiler) check(tt scanner.TokenType) bool {123	return compiler.current().Type == tt124}125func (compiler *compiler) declaration() Node {126	var state Node127	switch compiler.current().Type {128	case scanner.TokenGlobal:129		state = compiler.global()130	case scanner.TokenLocal:131		state = compiler.local()132	default:133		state = compiler.statement()134	}135	// Lua allows semicolons but they are not required136	if compiler.check(scanner.TokenSemicolon) {137		compiler.consume(scanner.TokenSemicolon)138	}139	return state140}141func (compiler *compiler) global() Node {142	compiler.consume(scanner.TokenGlobal)143	return compiler.variableDeclaration(func(names []Identifier, values []Node) Node {144		return GlobalDeclaration{145			names:  names,146			values: values,147		}148	})149}150func (compiler *compiler) local() Node {151	compiler.consume(scanner.TokenLocal)152	return compiler.variableDeclaration(func(names []Identifier, values []Node) Node {153		return LocalDeclaration{154			names:  names,155			values: values,156		}157	})158}159func (compiler *compiler) variableDeclaration(constructor func([]Identifier, []Node) Node) Node {160	names := []Identifier{compiler.identifier()}161	for compiler.check(scanner.TokenComma) {162		compiler.consume(scanner.TokenComma)163		names = append(names, compiler.identifier())164	}165	if !compiler.check(scanner.TokenEqual) {166		return constructor(names, nil)167	}168	compiler.consume(scanner.TokenEqual)169	values := []Node{compiler.rightHandSideExpression()}170	for compiler.check(scanner.TokenComma) {171		values = append(values, compiler.rightHandSideExpression())172	}173	return constructor(names, values)174}175func (compiler *compiler) statement() Node {176	switch compiler.current().Type {177	case scanner.TokenAssert:178		compiler.consume(scanner.TokenAssert)179		return AssertStatement{180			value: compiler.expression(),181		}182	case scanner.TokenFunction:183		return compiler.function()184	case scanner.TokenWhile:185		return compiler.whileStatement()186	case scanner.TokenFor:187		return compiler.forStatement()188	case scanner.TokenIf:189		return compiler.ifStatement()190	case scanner.TokenDo:191		compiler.consume(scanner.TokenDo)192		block := compiler.block()193		compiler.consume(scanner.TokenEnd)194		return block195	case scanner.TokenReturn:196		return compiler.returnStatement()197	default:198		return compiler.assignment()199	}200}201func (compiler *compiler) function() Node {202	compiler.consume(scanner.TokenFunction)203	name := compiler.identifier()204	parameters := compiler.parameters()205	var declarations []Node206	// todo: better error messages about non-terminated function207	for !compiler.check(scanner.TokenEnd) && !compiler.check(scanner.TokenEof) {208		declarations = append(declarations, compiler.declaration())209	}210	compiler.consume(scanner.TokenEnd)211	var body Node212	if len(declarations) == 1 {213		body = declarations[0]214	} else {215		body = BlockStatement{declarations}216	}217	return FunctionNode{name, parameters, body}218}219func (compiler *compiler) parameters() []Identifier {220	compiler.consume(scanner.TokenLeftParen)221	var identifiers []Identifier222	for !compiler.check(scanner.TokenEof) && !compiler.check(scanner.TokenRightParen) {223		identifiers = append(identifiers, compiler.identifier())224		if compiler.check(scanner.TokenComma) {225			compiler.consume(scanner.TokenComma)226		} else {227			break228		}229	}230	compiler.consume(scanner.TokenRightParen)231	return identifiers232}233// todo: depend on calling context for bracket words (if/then/end, while/do/end)234func (compiler *compiler) block() BlockStatement {235	var block BlockStatement236	for !compiler.terminateBlock() {237		block.statements = append(block.statements, compiler.declaration())238	}239	return block240}241// It's critical to check the type after the block so that you don't accidentally242// allow, for example: `do x = 1 then`243func (compiler *compiler) terminateBlock() bool {244	switch compiler.current().Type {245	case scanner.TokenEnd, scanner.TokenElse:246		return true247	default:248		return false249	}250}251func (compiler *compiler) whileStatement() Node {252	compiler.consume(scanner.TokenWhile)253	expression := compiler.expression()254	compiler.consume(scanner.TokenDo)255	body := compiler.block()256	compiler.consume(scanner.TokenEnd)257	return WhileStatement{258		condition: expression,259		body:      body,260	}261}262func (compiler *compiler) forStatement() Node {263	compiler.consume(scanner.TokenFor)264	variable := compiler.identifier()265	if compiler.check(scanner.TokenEqual) {266		return compiler.numericFor(variable)267	} else if compiler.check(scanner.TokenComma) || compiler.check(scanner.TokenIn) {268		return compiler.genericFor(variable)269	} else {270		compiler.error("Expected '=' or 'in' in for statement.")271		return NumericForStatement{variable, nil, nil}272	}273}274func (compiler *compiler) genericFor(variable Identifier) Node {275	targets := []Identifier{variable}276	for compiler.check(scanner.TokenComma) {277		compiler.consume(scanner.TokenComma)278		targets = append(targets, compiler.identifier())279	}280	compiler.consume(scanner.TokenIn)281	// Use rightHandSideExpression because we actually do a282	// multiple assignment with these283	iterator := []Node{compiler.rightHandSideExpression()}284	for compiler.check(scanner.TokenComma) {285		compiler.consume(scanner.TokenComma)286		iterator = append(iterator, compiler.rightHandSideExpression())287	}288	compiler.consume(scanner.TokenDo)289	body := compiler.block()290	compiler.consume(scanner.TokenEnd)291	return GenericForStatement{292		targets:  targets,293		iterator: iterator,294		body:     body,295	}296}297func (compiler *compiler) numericFor(variable Identifier) Node {298	compiler.consume(scanner.TokenEqual)299	// Doesn't use rightHandSideExpression because we only300	// use the first return from any calls in this position301	values := []Node{compiler.expression()}302	for compiler.check(scanner.TokenComma) {303		compiler.consume(scanner.TokenComma)304		values = append(values, compiler.expression())305	}306	compiler.consume(scanner.TokenDo)307	body := compiler.block()308	compiler.consume(scanner.TokenEnd)309	return NumericForStatement{310		variable: variable,311		values:   values,312		body:     body,313	}314}315func (compiler *compiler) ifStatement() Node {316	compiler.consume(scanner.TokenIf)317	condition := compiler.expression()318	compiler.consume(scanner.TokenThen)319	body := compiler.block()320	if compiler.check(scanner.TokenElse) {321		compiler.consume(scanner.TokenElse)322		counterfactual := compiler.block()323		compiler.consume(scanner.TokenEnd)324		return IfStatement{325			condition:      condition,326			body:           body,327			counterfactual: counterfactual,328		}329	} else {330		compiler.consume(scanner.TokenEnd)331		return IfStatement{332			condition: condition,333			body:      body,334		}335	}336}337func (compiler *compiler) returnStatement() Node {338	compiler.consume(scanner.TokenReturn)339	if compiler.check(scanner.TokenEnd) || compiler.check(scanner.TokenElse) {340		return ReturnStatement{341			arity:  1,342			values: []Node{NilPrimary()},343		}344	}345	var expressions []Node = []Node{compiler.expression()}346	for compiler.check(scanner.TokenComma) {347		compiler.consume(scanner.TokenComma)348		expressions = append(expressions, compiler.expression())349	}350	// todo: overflow351	return ReturnStatement{352		arity:  byte(len(expressions)),353		values: expressions,354	}355}356func (compiler *compiler) assignment() Node {357	expression := compiler.expression()358	if compiler.check(scanner.TokenEqual) || compiler.check(scanner.TokenComma) {359		return compiler.multipleAssignment(expression)360	} else {361		return Expression{expression: expression}362	}363}364func (compiler *compiler) multipleAssignment(node Node) Node {365	// add all variables plus passed-in node to list366	variables := []Node{node}367	for compiler.check(scanner.TokenComma) {368		compiler.consume(scanner.TokenComma)369		// todo: actually allow assignment to expression if it resolves a variable???370		variables = append(variables, compiler.expression())371	}372	compiler.consume(scanner.TokenEqual)373	values := []Node{compiler.rightHandSideExpression()}374	for compiler.check(scanner.TokenComma) {375		compiler.consume(scanner.TokenComma)376		expression := compiler.rightHandSideExpression()377		values = append(values, expression)378	}379	assignment := MultipleAssignment{380		variables: variables,381		values:    values,382	}383	// add all expressions to right of equals to list inside assign384	return assignment385}386func (compiler *compiler) rightHandSideExpression() Node {387	expression := compiler.expression()388	switch expression.(type) {389	case *Call:390		expression.assign(nil)391	}392	return expression393}394func (compiler *compiler) identifier() Identifier {395	ident := compiler.current().Text396	compiler.consume(scanner.TokenIdentifier)397	return Identifier(ident)398}399func (compiler *compiler) expression() Node {400	return compiler.logicOr()401}402func (compiler *compiler) logicOr() Node {403	node := compiler.logicAnd()404	if compiler.current().Type != scanner.TokenOr {405		return node406	}407	lor := LogicOr{node, nil}408	for {409		if compiler.check(scanner.TokenOr) {410			compiler.advance()411			lor.or = append(lor.or, compiler.logicAnd())412		} else {413			return node414		}415	}416}417func (compiler *compiler) logicAnd() Node {418	node := compiler.comparison()419	if compiler.current().Type != scanner.TokenAnd {420		return node421	}422	land := LogicAnd{node, nil}423	for {424		if compiler.check(scanner.TokenAnd) {425			compiler.advance()426			land.and = append(land.and, compiler.comparison())427		} else {428			return land429		}430	}431}432func (compiler *compiler) comparison() Node {433	term := compiler.term()434	if !compiler.isComparison() {435		return term436	}437	compare := Comparison{term, nil}438	for compiler.isComparison() {439		token := compiler.current().Type440		compiler.advance()441		compItem := ComparisonItem{442			term:      compiler.term(),443			compareOp: token,444		}445		compare.items = append(compare.items, compItem)446	}447	return compare448}449func (compiler *compiler) isComparison() bool {450	switch compiler.current().Type {451	case scanner.TokenLess, scanner.TokenGreater, scanner.TokenLessEqual,452		scanner.TokenGreaterEqual, scanner.TokenTildeEqual, scanner.TokenEqualEqual:453		return true454	default:455		return false456	}457}458func (compiler *compiler) term() Node {459	factor := compiler.factor()460	if !compiler.isTerm() {461		return factor462	}463	term := Term{factor, nil}464	for compiler.isTerm() {465		token := compiler.current().Type466		compiler.advance()467		termItem := TermItem{468			factor: compiler.factor(),469			termOp: token,470		}471		term.items = append(term.items, termItem)472	}473	return term474}475func (compiler *compiler) isTerm() bool {476	token := compiler.current().Type477	switch token {478	case scanner.TokenMinus, scanner.TokenPlus:479		return true480	default:481		return false482	}483}484func (compiler *compiler) factor() Node {485	unary := compiler.unary()486	if !compiler.isFactor() {487		return unary488	}489	factor := Factor{unary, nil}490	for compiler.isFactor() {491		token := compiler.current().Type492		compiler.advance()493		factorItem := FactorItem{494			unary:    compiler.unary(),495			factorOp: token,496		}497		factor.items = append(factor.items, factorItem)498	}499	return factor500}501func (compiler *compiler) isFactor() bool {502	token := compiler.current().Type503	switch token {504	case scanner.TokenStar, scanner.TokenSlash:505		return true506	default:507		return false508	}509}510func (compiler *compiler) unary() Node {511	switch compiler.current().Type {512	case scanner.TokenMinus:513		compiler.advance()514		return NegateUnary{compiler.unary()}515	case scanner.TokenBang:516		compiler.advance()517		return NotUnary{compiler.unary()}518	default:519		return compiler.exponent()520	}521}522func (compiler *compiler) exponent() Node {523	call := compiler.call()524	if compiler.check(scanner.TokenCaret) {525		compiler.consume(scanner.TokenCaret)526		exp := compiler.call()527		return Exponent{call, &exp}528	} else {529		return call530	}531}532func (compiler *compiler) call() Node {533	primary := compiler.primary()534	for compiler.isCall() {535		switch compiler.current().Type {536		case scanner.TokenDot:537			compiler.consume(scanner.TokenDot)538			attribute := compiler.identifier()539			primary = TableAccessor{540				primary,541				StringPrimary(string(attribute)),542			}543		case scanner.TokenLeftBracket:544			compiler.consume(scanner.TokenLeftBracket)545			attribute := compiler.expression()546			compiler.consume(scanner.TokenRightBracket)547			primary = TableAccessor{548				primary,549				attribute,550			}551		case scanner.TokenLeftParen:552			args := compiler.arguments()553			primary = &Call{554				base:         primary,555				arguments:    args,556				isAssignment: false,557			}558		}559	}560	return primary561}562func (compiler *compiler) isCall() bool {563	switch compiler.current().Type {564	case scanner.TokenDot, scanner.TokenLeftBracket, scanner.TokenLeftParen:565		return true566	default:567		return false568	}569}570func (compiler *compiler) arguments() []Node {571	var args []Node572	compiler.consume(scanner.TokenLeftParen)573	for !compiler.check(scanner.TokenRightParen) {574		args = append(args, compiler.expression())575		if !compiler.check(scanner.TokenRightParen) {576			compiler.consume(scanner.TokenComma)577		}578	}579	compiler.consume(scanner.TokenRightParen)580	return args581}582func (compiler *compiler) primary() Node {583	switch compiler.current().Type {584	case scanner.TokenTrue:585		compiler.advance()586		return BooleanPrimary(true)587	case scanner.TokenFalse:588		compiler.advance()589		return BooleanPrimary(false)590	case scanner.TokenNumber:591		flt, err := strconv.ParseFloat(592			compiler.current().Text,593			64,594		)595		if err != nil {596			compiler.error(fmt.Sprint("Cannot parse number: ", compiler.current().Text))597		}598		compiler.advance()599		return NumberPrimary(flt)600	case scanner.TokenString:601		str := StringPrimary(compiler.current().Text)602		compiler.advance()603		return str604	case scanner.TokenNil:605		n := NilPrimary()606		compiler.advance()607		return n608	case scanner.TokenIdentifier:609		return compiler.variable()610	case scanner.TokenLeftBrace:611		return compiler.tableLiteral()612	case scanner.TokenLeftParen:613		return compiler.grouping()614	default:615		compiler.error(fmt.Sprint("Unexpected token: ", compiler.current()))616		compiler.advance()617		return NilPrimary()618	}619}620func (compiler *compiler) grouping() Node {621	compiler.consume(scanner.TokenLeftParen)622	node := compiler.expression()623	compiler.consume(scanner.TokenRightParen)624	return node625}626func (compiler *compiler) variable() Node {627	name := compiler.current().Text628	compiler.advance()629	return VariablePrimary{Identifier(name)}630}631func (compiler *compiler) getLocal(name Identifier) int {632	for i, local := range compiler.locals {633		if local.name == name {634			return i635		}636	}637	return -1638}639func (compiler *compiler) getUpvalue(name Identifier) int {640	for i, upvalue := range compiler.upvalues {641		if upvalue.name == name {642			return i643		}644	}645	if compiler.parent == nil {646		// no enclosing scope, no upvalue647		return -1648	}649	for i, local := range compiler.parent.locals {650		// this won't resolve at top level because we checked in the calling context651		if local.name == name {652			// found one, make an upvalue pointing to the local653			return compiler.makeUpvalue(name, i, true)654		}655	}656	// check the enclosing scope657	upvalue := compiler.parent.getUpvalue(name)658	if upvalue == -1 {659		// it's just a global660		return upvalue661	} else {662		// the enclosing scope has an upvalue, make an upvalue pointing at that one663		return compiler.makeUpvalue(name, upvalue, false)664	}665}666func (compiler *compiler) makeUpvalue(name Identifier, index int, isLocal bool) int {667	upvalue := len(compiler.upvalues)668	compiler.upvalues = append(compiler.upvalues, &Upvalue{669		name:    name,670		index:   index,671		isLocal: isLocal,672	})673	return upvalue674}675func (compiler *compiler) tableLiteral() TableLiteral {676	compiler.advance()677	var pairs []Node678	// todo: handle unterminated brace679	for compiler.current().Type != scanner.TokenRightBrace {680		pairs = append(pairs, compiler.pair())681	}682	compiler.consume(scanner.TokenRightBrace)683	return TableLiteral{pairs}684}685func (compiler *compiler) pair() Node {686	switch {687	case compiler.check(scanner.TokenLeftBracket):688		return compiler.literalPair()689	case compiler.check(scanner.TokenIdentifier) && compiler.peek().Type == scanner.TokenEqual:690		return compiler.stringPair()691	default:692		return compiler.value()693	}694}695func (compiler *compiler) literalPair() Node {696	compiler.consume(scanner.TokenLeftBracket)697	expr := compiler.expression()698	compiler.consume(scanner.TokenRightBracket)699	compiler.consume(scanner.TokenEqual)700	value := compiler.expression()701	if compiler.check(scanner.TokenComma) {702		compiler.consume(scanner.TokenComma)703	}704	return LiteralPair{705		key:   expr,706		value: value,707	}708}709func (compiler *compiler) stringPair() Node {710	ident := compiler.identifier()711	compiler.consume(scanner.TokenEqual)712	expr := compiler.expression()713	if compiler.check(scanner.TokenComma) {714		compiler.consume(scanner.TokenComma)715	}716	return StringPair{717		key:   StringPrimary(string(ident)),718		value: expr,719	}720}721func (compiler *compiler) value() Node {722	expr := compiler.expression()723	if compiler.check(scanner.TokenComma) {724		compiler.consume(scanner.TokenComma)725	}726	return Value{expr}727}728func (compiler *compiler) advance() {729	compiler.curr += 1730}731func (compiler *compiler) consume(tt scanner.TokenType) {732	if compiler.current().Type != tt {733		compiler.error(fmt.Sprint("Expected type ", tt, ", found ", compiler.current().Type))734	}735	compiler.advance()736}737// todo: use longer values for more constants...

cc_test.go

Source:cc_test.go

1// Copyright 2017 The Go Authors. All rights reserved.2// Use of this source code is governed by a BSD-style3// license that can be found in the LICENSE file.4// sanitizers_test checks the use of Go with sanitizers like msan, asan, etc.5// See https://github.com/google/sanitizers.6package sanitizers_test7import (8	"bytes"9	"encoding/json"10	"errors"11	"fmt"12	"io/ioutil"13	"os"14	"os/exec"15	"path/filepath"16	"regexp"17	"strconv"18	"strings"19	"sync"20	"syscall"21	"testing"22	"unicode"23)24var overcommit struct {25	sync.Once26	value int27	err   error28}29// requireOvercommit skips t if the kernel does not allow overcommit.30func requireOvercommit(t *testing.T) {31	t.Helper()32	overcommit.Once.Do(func() {33		var out []byte34		out, overcommit.err = ioutil.ReadFile("/proc/sys/vm/overcommit_memory")35		if overcommit.err != nil {36			return37		}38		overcommit.value, overcommit.err = strconv.Atoi(string(bytes.TrimSpace(out)))39	})40	if overcommit.err != nil {41		t.Skipf("couldn't determine vm.overcommit_memory (%v); assuming no overcommit", overcommit.err)42	}43	if overcommit.value == 2 {44		t.Skip("vm.overcommit_memory=2")45	}46}47var env struct {48	sync.Once49	m   map[string]string50	err error51}52// goEnv returns the output of $(go env) as a map.53func goEnv(key string) (string, error) {54	env.Once.Do(func() {55		var out []byte56		out, env.err = exec.Command("go", "env", "-json").Output()57		if env.err != nil {58			return59		}60		env.m = make(map[string]string)61		env.err = json.Unmarshal(out, &env.m)62	})63	if env.err != nil {64		return "", env.err65	}66	v, ok := env.m[key]67	if !ok {68		return "", fmt.Errorf("`go env`: no entry for %v", key)69	}70	return v, nil71}72// replaceEnv sets the key environment variable to value in cmd.73func replaceEnv(cmd *exec.Cmd, key, value string) {74	if cmd.Env == nil {75		cmd.Env = os.Environ()76	}77	cmd.Env = append(cmd.Env, key+"="+value)78}79// mustRun executes t and fails cmd with a well-formatted message if it fails.80func mustRun(t *testing.T, cmd *exec.Cmd) {81	t.Helper()82	out, err := cmd.CombinedOutput()83	if err != nil {84		t.Fatalf("%#q exited with %v\n%s", strings.Join(cmd.Args, " "), err, out)85	}86}87// cc returns a cmd that executes `$(go env CC) $(go env GOGCCFLAGS) $args`.88func cc(args ...string) (*exec.Cmd, error) {89	CC, err := goEnv("CC")90	if err != nil {91		return nil, err92	}93	GOGCCFLAGS, err := goEnv("GOGCCFLAGS")94	if err != nil {95		return nil, err96	}97	// Split GOGCCFLAGS, respecting quoting.98	//99	// TODO(bcmills): This code also appears in100	// misc/cgo/testcarchive/carchive_test.go, and perhaps ought to go in101	// src/cmd/dist/test.go as well. Figure out where to put it so that it can be102	// shared.103	var flags []string104	quote := '\000'105	start := 0106	lastSpace := true107	backslash := false108	for i, c := range GOGCCFLAGS {109		if quote == '\000' && unicode.IsSpace(c) {110			if !lastSpace {111				flags = append(flags, GOGCCFLAGS[start:i])112				lastSpace = true113			}114		} else {115			if lastSpace {116				start = i117				lastSpace = false118			}119			if quote == '\000' && !backslash && (c == '"' || c == '\'') {120				quote = c121				backslash = false122			} else if !backslash && quote == c {123				quote = '\000'124			} else if (quote == '\000' || quote == '"') && !backslash && c == '\\' {125				backslash = true126			} else {127				backslash = false128			}129		}130	}131	if !lastSpace {132		flags = append(flags, GOGCCFLAGS[start:])133	}134	cmd := exec.Command(CC, flags...)135	cmd.Args = append(cmd.Args, args...)136	return cmd, nil137}138type version struct {139	name         string140	major, minor int141}142var compiler struct {143	sync.Once144	version145	err error146}147// compilerVersion detects the version of $(go env CC).148//149// It returns a non-nil error if the compiler matches a known version schema but150// the version could not be parsed, or if $(go env CC) could not be determined.151func compilerVersion() (version, error) {152	compiler.Once.Do(func() {153		compiler.err = func() error {154			compiler.name = "unknown"155			cmd, err := cc("--version")156			if err != nil {157				return err158			}159			out, err := cmd.Output()160			if err != nil {161				// Compiler does not support "--version" flag: not Clang or GCC.162				return nil163			}164			var match [][]byte165			if bytes.HasPrefix(out, []byte("gcc")) {166				compiler.name = "gcc"167				cmd, err := cc("-dumpversion")168				if err != nil {169					return err170				}171				out, err := cmd.Output()172				if err != nil {173					// gcc, but does not support gcc's "-dumpversion" flag?!174					return err175				}176				gccRE := regexp.MustCompile(`(\d+)\.(\d+)`)177				match = gccRE.FindSubmatch(out)178			} else {179				clangRE := regexp.MustCompile(`clang version (\d+)\.(\d+)`)180				if match = clangRE.FindSubmatch(out); len(match) > 0 {181					compiler.name = "clang"182				}183			}184			if len(match) < 3 {185				return nil // "unknown"186			}187			if compiler.major, err = strconv.Atoi(string(match[1])); err != nil {188				return err189			}190			if compiler.minor, err = strconv.Atoi(string(match[2])); err != nil {191				return err192			}193			return nil194		}()195	})196	return compiler.version, compiler.err197}198type compilerCheck struct {199	once sync.Once200	err  error201	skip bool // If true, skip with err instead of failing with it.202}203type config struct {204	sanitizer string205	cFlags, ldFlags, goFlags []string206	sanitizerCheck, runtimeCheck compilerCheck207}208var configs struct {209	sync.Mutex210	m map[string]*config211}212// configure returns the configuration for the given sanitizer.213func configure(sanitizer string) *config {214	configs.Lock()215	defer configs.Unlock()216	if c, ok := configs.m[sanitizer]; ok {217		return c218	}219	c := &config{220		sanitizer: sanitizer,221		cFlags:    []string{"-fsanitize=" + sanitizer},222		ldFlags:   []string{"-fsanitize=" + sanitizer},223	}224	if testing.Verbose() {225		c.goFlags = append(c.goFlags, "-x")226	}227	switch sanitizer {228	case "memory":229		c.goFlags = append(c.goFlags, "-msan")230	case "thread":231		c.goFlags = append(c.goFlags, "--installsuffix=tsan")232		compiler, _ := compilerVersion()233		if compiler.name == "gcc" {234			c.cFlags = append(c.cFlags, "-fPIC")235			c.ldFlags = append(c.ldFlags, "-fPIC", "-static-libtsan")236		}237	default:238		panic(fmt.Sprintf("unrecognized sanitizer: %q", sanitizer))239	}240	if configs.m == nil {241		configs.m = make(map[string]*config)242	}243	configs.m[sanitizer] = c244	return c245}246// goCmd returns a Cmd that executes "go $subcommand $args" with appropriate247// additional flags and environment.248func (c *config) goCmd(subcommand string, args ...string) *exec.Cmd {249	cmd := exec.Command("go", subcommand)250	cmd.Args = append(cmd.Args, c.goFlags...)251	cmd.Args = append(cmd.Args, args...)252	replaceEnv(cmd, "CGO_CFLAGS", strings.Join(c.cFlags, " "))253	replaceEnv(cmd, "CGO_LDFLAGS", strings.Join(c.ldFlags, " "))254	return cmd255}256// skipIfCSanitizerBroken skips t if the C compiler does not produce working257// binaries as configured.258func (c *config) skipIfCSanitizerBroken(t *testing.T) {259	check := &c.sanitizerCheck260	check.once.Do(func() {261		check.skip, check.err = c.checkCSanitizer()262	})263	if check.err != nil {264		t.Helper()265		if check.skip {266			t.Skip(check.err)267		}268		t.Fatal(check.err)269	}270}271var cMain = []byte(`272int main() {273	return 0;274}275`)276func (c *config) checkCSanitizer() (skip bool, err error) {277	dir, err := ioutil.TempDir("", c.sanitizer)278	if err != nil {279		return false, fmt.Errorf("failed to create temp directory: %v", err)280	}281	defer os.RemoveAll(dir)282	src := filepath.Join(dir, "return0.c")283	if err := ioutil.WriteFile(src, cMain, 0600); err != nil {284		return false, fmt.Errorf("failed to write C source file: %v", err)285	}286	dst := filepath.Join(dir, "return0")287	cmd, err := cc(c.cFlags...)288	if err != nil {289		return false, err290	}291	cmd.Args = append(cmd.Args, c.ldFlags...)292	cmd.Args = append(cmd.Args, "-o", dst, src)293	out, err := cmd.CombinedOutput()294	if err != nil {295		if bytes.Contains(out, []byte("-fsanitize")) &&296			(bytes.Contains(out, []byte("unrecognized")) ||297				bytes.Contains(out, []byte("unsupported"))) {298			return true, errors.New(string(out))299		}300		return true, fmt.Errorf("%#q failed: %v\n%s", strings.Join(cmd.Args, " "), err, out)301	}302	if out, err := exec.Command(dst).CombinedOutput(); err != nil {303		if os.IsNotExist(err) {304			return true, fmt.Errorf("%#q failed to produce executable: %v", strings.Join(cmd.Args, " "), err)305		}306		snippet := bytes.SplitN(out, []byte{'\n'}, 2)[0]307		return true, fmt.Errorf("%#q generated broken executable: %v\n%s", strings.Join(cmd.Args, " "), err, snippet)308	}309	return false, nil310}311// skipIfRuntimeIncompatible skips t if the Go runtime is suspected not to work312// with cgo as configured.313func (c *config) skipIfRuntimeIncompatible(t *testing.T) {314	check := &c.runtimeCheck315	check.once.Do(func() {316		check.skip, check.err = c.checkRuntime()317	})318	if check.err != nil {319		t.Helper()320		if check.skip {321			t.Skip(check.err)322		}323		t.Fatal(check.err)324	}325}326func (c *config) checkRuntime() (skip bool, err error) {327	if c.sanitizer != "thread" {328		return false, nil329	}330	// libcgo.h sets CGO_TSAN if it detects TSAN support in the C compiler.331	// Dump the preprocessor defines to check that works.332	// (Sometimes it doesn't: see https://golang.org/issue/15983.)333	cmd, err := cc(c.cFlags...)334	if err != nil {335		return false, err336	}337	cmd.Args = append(cmd.Args, "-dM", "-E", "../../../src/runtime/cgo/libcgo.h")338	cmdStr := strings.Join(cmd.Args, " ")339	out, err := cmd.CombinedOutput()340	if err != nil {341		return false, fmt.Errorf("%#q exited with %v\n%s", cmdStr, err, out)342	}343	if !bytes.Contains(out, []byte("#define CGO_TSAN")) {344		return true, fmt.Errorf("%#q did not define CGO_TSAN", cmdStr)345	}...

security_test.go

Source:security_test.go

...85	{"-x", "@obj"},86}87func TestCheckCompilerFlags(t *testing.T) {88	for _, f := range goodCompilerFlags {89		if err := checkCompilerFlags("test", "test", f); err != nil {90			t.Errorf("unexpected error for %q: %v", f, err)91		}92	}93	for _, f := range badCompilerFlags {94		if err := checkCompilerFlags("test", "test", f); err == nil {95			t.Errorf("missing error for %q", f)96		}97	}98}99var goodLinkerFlags = [][]string{100	{"-Fbar"},101	{"-lbar"},102	{"-Lbar"},103	{"-fpic"},104	{"-fno-pic"},105	{"-fPIC"},106	{"-fno-PIC"},107	{"-fpie"},108	{"-fno-pie"},109	{"-fPIE"},110	{"-fno-PIE"},111	{"-fsanitize=hands"},112	{"-g"},113	{"-ggdb"},114	{"-march=souza"},115	{"-mcpu=123"},116	{"-mfpu=123"},117	{"-mtune=happybirthday"},118	{"-pic"},119	{"-pthread"},120	{"-Wl,-rpath,foo"},121	{"-Wl,-rpath,$ORIGIN/foo"},122	{"-Wl,--warn-error"},123	{"-Wl,--no-warn-error"},124	{"foo.so"},125	{"_ä¸ç.dll"},126	{"./x.o"},127	{"libcgosotest.dylib"},128	{"-F", "framework"},129	{"-l", "."},130	{"-l", "/etc/passwd"},131	{"-l", "ä¸ç"},132	{"-L", "framework"},133	{"-framework", "Chocolate"},134	{"-v"},135	{"-Wl,-framework", "-Wl,Chocolate"},136	{"-Wl,-framework,Chocolate"},137	{"-Wl,-unresolved-symbols=ignore-all"},138}139var badLinkerFlags = [][]string{140	{"-DFOO"},141	{"-Dfoo=bar"},142	{"-W"},143	{"-Wall"},144	{"-fobjc-arc"},145	{"-fno-objc-arc"},146	{"-fomit-frame-pointer"},147	{"-fno-omit-frame-pointer"},148	{"-fsplit-stack"},149	{"-fno-split-stack"},150	{"-fstack-xxx"},151	{"-fno-stack-xxx"},152	{"-mstack-overflow"},153	{"-mno-stack-overflow"},154	{"-mnop-fun-dllimport"},155	{"-std=c99"},156	{"-xc"},157	{"-D", "FOO"},158	{"-D", "foo=bar"},159	{"-I", "FOO"},160	{"-L", "@foo"},161	{"-L", "-foo"},162	{"-x", "c"},163	{"-D@X"},164	{"-D-X"},165	{"-I@dir"},166	{"-I-dir"},167	{"-O@1"},168	{"-Wa,-foo"},169	{"-W@foo"},170	{"-g@gdb"},171	{"-g-gdb"},172	{"-march=@dawn"},173	{"-march=-dawn"},174	{"-std=@c99"},175	{"-std=-c99"},176	{"-x@c"},177	{"-x-c"},178	{"-D", "@foo"},179	{"-D", "-foo"},180	{"-I", "@foo"},181	{"-I", "-foo"},182	{"-l", "@foo"},183	{"-l", "-foo"},184	{"-framework", "-Caffeine"},185	{"-framework", "@Home"},186	{"-Wl,-framework,-Caffeine"},187	{"-Wl,-framework", "-Wl,@Home"},188	{"-Wl,-framework", "@Home"},189	{"-Wl,-framework,Chocolate,@Home"},190	{"-x", "--c"},191	{"-x", "@obj"},192	{"-Wl,-rpath,@foo"},193	{"../x.o"},194}195func TestCheckLinkerFlags(t *testing.T) {196	for _, f := range goodLinkerFlags {197		if err := checkLinkerFlags("test", "test", f); err != nil {198			t.Errorf("unexpected error for %q: %v", f, err)199		}200	}201	for _, f := range badLinkerFlags {202		if err := checkLinkerFlags("test", "test", f); err == nil {203			t.Errorf("missing error for %q", f)204		}205	}206}207func TestCheckFlagAllowDisallow(t *testing.T) {208	if err := checkCompilerFlags("TEST", "test", []string{"-disallow"}); err == nil {209		t.Fatalf("missing error for -disallow")210	}211	os.Setenv("CGO_TEST_ALLOW", "-disallo")212	if err := checkCompilerFlags("TEST", "test", []string{"-disallow"}); err == nil {213		t.Fatalf("missing error for -disallow with CGO_TEST_ALLOW=-disallo")214	}215	os.Setenv("CGO_TEST_ALLOW", "-disallow")216	if err := checkCompilerFlags("TEST", "test", []string{"-disallow"}); err != nil {217		t.Fatalf("unexpected error for -disallow with CGO_TEST_ALLOW=-disallow: %v", err)218	}219	os.Unsetenv("CGO_TEST_ALLOW")220	if err := checkCompilerFlags("TEST", "test", []string{"-Wall"}); err != nil {221		t.Fatalf("unexpected error for -Wall: %v", err)222	}223	os.Setenv("CGO_TEST_DISALLOW", "-Wall")224	if err := checkCompilerFlags("TEST", "test", []string{"-Wall"}); err == nil {225		t.Fatalf("missing error for -Wall with CGO_TEST_DISALLOW=-Wall")226	}227	os.Setenv("CGO_TEST_ALLOW", "-Wall") // disallow wins228	if err := checkCompilerFlags("TEST", "test", []string{"-Wall"}); err == nil {229		t.Fatalf("missing error for -Wall with CGO_TEST_DISALLOW=-Wall and CGO_TEST_ALLOW=-Wall")230	}231	os.Setenv("CGO_TEST_ALLOW", "-fplugin.*")232	os.Setenv("CGO_TEST_DISALLOW", "-fplugin=lint.so")233	if err := checkCompilerFlags("TEST", "test", []string{"-fplugin=faster.so"}); err != nil {234		t.Fatalf("unexpected error for -fplugin=faster.so: %v", err)235	}236	if err := checkCompilerFlags("TEST", "test", []string{"-fplugin=lint.so"}); err == nil {237		t.Fatalf("missing error for -fplugin=lint.so: %v", err)238	}239}...

check

Using AI Code Generation

1import (2func main() {3	fset := token.NewFileSet()4	f, err := parser.ParseFile(fset, "1.go", nil, parser.AllErrors)5	if err != nil {6		log.Fatal(err)7	}8	ast.Print(fset, f)9	fmt.Println("check")10	err = parser.CheckFile(fset, "1.go", nil, parser.AllErrors)11	if err != nil {12		log.Fatal(err)13	}14	fmt.Println("no error")15}16import "fmt"17func main() {18	fmt.Println("hello world")19}20Traversing the AST using ast.Inspect() method21import (22func main() {23	fset := token.NewFileSet()24	f, err := parser.ParseFile(fset, "1.go", nil, parser.AllErrors)25	if err != nil {26		log.Fatal(err)27	}28	ast.Print(fset, f)29	fmt.Println("check")30	err = parser.CheckFile(fset, "1.go", nil, parser.AllErrors)31	if err != nil {32		log.Fatal(err)33	}34	fmt.Println("no error")

check

Using AI Code Generation

1import (2func main() {3	fmt.Println(reflect.TypeOf(a))4	fmt.Println(reflect.ValueOf(a).Kind())5	fmt.Println(reflect.ValueOf(a).Type())6}7import (8func main() {9	fmt.Println(reflect.TypeOf(a))10	fmt.Println(reflect.ValueOf(a).Kind())11	fmt.Println(reflect.ValueOf(a).Type())12	fmt.Println(reflect.ValueOf(a).Int())13}14import (15func main() {16	fmt.Println(reflect.TypeOf(a))17	fmt.Println(reflect.ValueOf(a).Kind())18	fmt.Println(reflect.ValueOf(a).Type())19	fmt.Println(reflect.ValueOf(a).Int())20	fmt.Println(reflect.ValueOf(a).Bool())21}22import (23func main() {24	fmt.Println(reflect.TypeOf(a))25	fmt.Println(reflect.ValueOf(a).Kind())26	fmt.Println(reflect.ValueOf(a).Type())27	fmt.Println(reflect.ValueOf(a).Int())28	fmt.Println(reflect.ValueOf(a).Bool())29	fmt.Println(reflect.ValueOf(a).String())30}31import (32func main() {33	fmt.Println(reflect.TypeOf(a))34	fmt.Println(reflect.ValueOf(a).Kind())35	fmt.Println(reflect.ValueOf(a).Type())36	fmt.Println(reflect.ValueOf(a).Int())37	fmt.Println(reflect.ValueOf(a).Bool())38	fmt.Println(reflect.ValueOf(a).String())39	fmt.Println(reflect.ValueOf(a).Float())40}41import

check

Using AI Code Generation

1import "fmt"2func main() {3	a := compiler{}4	a.check()5}6import "fmt"7func main() {8	a := compiler{}9	a.check()10}11import "fmt"12func main() {13	a := compiler{}14	a.check()15}16import "fmt"17func main() {18	a := compiler{}19	a.check()20}21import "fmt"22func main() {23	a := compiler{}24	a.check()25}26import "fmt"27func main() {28	a := compiler{}29	a.check()30}31import "fmt"32func main() {33	a := compiler{}34	a.check()35}36import "fmt"37func main() {38	a := compiler{}39	a.check()40}41import "fmt"42func main() {43	a := compiler{}44	a.check()45}46import "fmt"47func main() {48	a := compiler{}49	a.check()50}51import "fmt"52func main() {53	a := compiler{}54	a.check()55}56import "fmt"57func main() {58	a := compiler{}59	a.check()60}61import "fmt"62func main() {63	a := compiler{}64	a.check()65}66import "fmt"67func main() {68	a := compiler{}69	a.check()70}

check

Using AI Code Generation

1import (2type Compiler struct {3}4func (c Compiler) check() {5    fmt.Println("Checking code for", c.language)6}7func main() {8    c := Compiler{"Go"}9    c.check()10}11import (12type Compiler struct {13}14func (c Compiler) check() {15    fmt.Println("Checking code for", c.language)16}17func main() {18    c := Compiler{"Go"}19    c.check()20}21import (22type Compiler struct {23}24func (c Compiler) check() {25    fmt.Println("Checking code for", c.language)26}27func main() {28    c := Compiler{"Go"}29    c.check()30}31import (32type Compiler struct {33}34func (c Compiler) check() {35    fmt.Println("Checking code for", c.language)36}37func main() {38    c := Compiler{"Go"}39    c.check()40}41import (42type Compiler struct {43}44func (c Compiler) check() {45    fmt.Println("Checking code for", c.language)46}47func main() {48    c := Compiler{"Go"}49    c.check()50}

check

Using AI Code Generation

1import (2func main() {3	if compiler == "gc" {4		fmt.Println("The compiler is gc")5	} else {6		fmt.Println("The compiler is not gc")7	}8}

check

Using AI Code Generation

1import (2func main() {3    fmt.Println("Hello, playground")4    c := Compiler.NewCompiler()5    c.Check()6}7func Check() {8    fmt.Println("Checking...")9}

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.