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How to use checkUnused method of compiler Package

Best Syzkaller code snippet using compiler.checkUnused

noder.go

Source:noder.go

...195	imported_unsafe = false196	p.setlineno(p.file.PkgName)197	mkpackage(p.file.PkgName.Value)198	if pragma, ok := p.file.Pragma.(*Pragma); ok {199		p.checkUnused(pragma)200	}201	xtop = append(xtop, p.decls(p.file.DeclList)...)202	for _, n := range p.linknames {203		if !imported_unsafe {204			p.yyerrorpos(n.pos, "//go:linkname only allowed in Go files that import \"unsafe\"")205			continue206		}207		s := lookup(n.local)208		if n.remote != "" {209			s.Linkname = n.remote210		} else {211			// Use the default object symbol name if the212			// user didn't provide one.213			if myimportpath == "" {214				p.yyerrorpos(n.pos, "//go:linkname requires linkname argument or -p compiler flag")215			} else {216				s.Linkname = objabi.PathToPrefix(myimportpath) + "." + n.local217			}218		}219	}220	// The linker expects an ABI0 wrapper for all cgo-exported221	// functions.222	for _, prag := range p.pragcgobuf {223		switch prag[0] {224		case "cgo_export_static", "cgo_export_dynamic":225			if symabiRefs == nil {226				symabiRefs = make(map[string]obj.ABI)227			}228			symabiRefs[prag[1]] = obj.ABI0229		}230	}231	pragcgobuf = append(pragcgobuf, p.pragcgobuf...)232	lineno = src.NoXPos233	clearImports()234}235func (p *noder) decls(decls []syntax.Decl) (l []*Node) {236	var cs constState237	for _, decl := range decls {238		p.setlineno(decl)239		switch decl := decl.(type) {240		case *syntax.ImportDecl:241			p.importDecl(decl)242		case *syntax.VarDecl:243			l = append(l, p.varDecl(decl)...)244		case *syntax.ConstDecl:245			l = append(l, p.constDecl(decl, &cs)...)246		case *syntax.TypeDecl:247			l = append(l, p.typeDecl(decl))248		case *syntax.FuncDecl:249			l = append(l, p.funcDecl(decl))250		default:251			panic("unhandled Decl")252		}253	}254	return255}256func (p *noder) importDecl(imp *syntax.ImportDecl) {257	if imp.Path.Bad {258		return // avoid follow-on errors if there was a syntax error259	}260	if pragma, ok := imp.Pragma.(*Pragma); ok {261		p.checkUnused(pragma)262	}263	val := p.basicLit(imp.Path)264	ipkg := importfile(&val)265	if ipkg == nil {266		if nerrors == 0 {267			Fatalf("phase error in import")268		}269		return270	}271	ipkg.Direct = true272	var my *types.Sym273	if imp.LocalPkgName != nil {274		my = p.name(imp.LocalPkgName)275	} else {276		my = lookup(ipkg.Name)277	}278	pack := p.nod(imp, OPACK, nil, nil)279	pack.Sym = my280	pack.Name.Pkg = ipkg281	switch my.Name {282	case ".":283		importdot(ipkg, pack)284		return285	case "init":286		yyerrorl(pack.Pos, "cannot import package as init - init must be a func")287		return288	case "_":289		return290	}291	if my.Def != nil {292		redeclare(pack.Pos, my, "as imported package name")293	}294	my.Def = asTypesNode(pack)295	my.Lastlineno = pack.Pos296	my.Block = 1 // at top level297}298func (p *noder) varDecl(decl *syntax.VarDecl) []*Node {299	names := p.declNames(decl.NameList)300	typ := p.typeExprOrNil(decl.Type)301	var exprs []*Node302	if decl.Values != nil {303		exprs = p.exprList(decl.Values)304	}305	if pragma, ok := decl.Pragma.(*Pragma); ok {306		p.checkUnused(pragma)307	}308	p.setlineno(decl)309	return variter(names, typ, exprs)310}311// constState tracks state between constant specifiers within a312// declaration group. This state is kept separate from noder so nested313// constant declarations are handled correctly (e.g., issue 15550).314type constState struct {315	group  *syntax.Group316	typ    *Node317	values []*Node318	iota   int64319}320func (p *noder) constDecl(decl *syntax.ConstDecl, cs *constState) []*Node {321	if decl.Group == nil || decl.Group != cs.group {322		*cs = constState{323			group: decl.Group,324		}325	}326	if pragma, ok := decl.Pragma.(*Pragma); ok {327		p.checkUnused(pragma)328	}329	names := p.declNames(decl.NameList)330	typ := p.typeExprOrNil(decl.Type)331	var values []*Node332	if decl.Values != nil {333		values = p.exprList(decl.Values)334		cs.typ, cs.values = typ, values335	} else {336		if typ != nil {337			yyerror("const declaration cannot have type without expression")338		}339		typ, values = cs.typ, cs.values340	}341	nn := make([]*Node, 0, len(names))342	for i, n := range names {343		if i >= len(values) {344			yyerror("missing value in const declaration")345			break346		}347		v := values[i]348		if decl.Values == nil {349			v = treecopy(v, n.Pos)350		}351		n.Op = OLITERAL352		declare(n, dclcontext)353		n.Name.Param.Ntype = typ354		n.Name.Defn = v355		n.SetIota(cs.iota)356		nn = append(nn, p.nod(decl, ODCLCONST, n, nil))357	}358	if len(values) > len(names) {359		yyerror("extra expression in const declaration")360	}361	cs.iota++362	return nn363}364func (p *noder) typeDecl(decl *syntax.TypeDecl) *Node {365	n := p.declName(decl.Name)366	n.Op = OTYPE367	declare(n, dclcontext)368	// decl.Type may be nil but in that case we got a syntax error during parsing369	typ := p.typeExprOrNil(decl.Type)370	param := n.Name.Param371	param.Ntype = typ372	param.Alias = decl.Alias373	if pragma, ok := decl.Pragma.(*Pragma); ok {374		if !decl.Alias {375			param.Pragma = pragma.Flag & TypePragmas376			pragma.Flag &^= TypePragmas377		}378		p.checkUnused(pragma)379	}380	nod := p.nod(decl, ODCLTYPE, n, nil)381	if param.Alias && !langSupported(1, 9, localpkg) {382		yyerrorl(nod.Pos, "type aliases only supported as of -lang=go1.9")383	}384	return nod385}386func (p *noder) declNames(names []*syntax.Name) []*Node {387	nodes := make([]*Node, 0, len(names))388	for _, name := range names {389		nodes = append(nodes, p.declName(name))390	}391	return nodes392}393func (p *noder) declName(name *syntax.Name) *Node {394	n := dclname(p.name(name))395	n.Pos = p.pos(name)396	return n397}398func (p *noder) funcDecl(fun *syntax.FuncDecl) *Node {399	name := p.name(fun.Name)400	t := p.signature(fun.Recv, fun.Type)401	f := p.nod(fun, ODCLFUNC, nil, nil)402	if fun.Recv == nil {403		if name.Name == "init" {404			name = renameinit()405			if t.List.Len() > 0 || t.Rlist.Len() > 0 {406				yyerrorl(f.Pos, "func init must have no arguments and no return values")407			}408		}409		if localpkg.Name == "main" && name.Name == "main" {410			if t.List.Len() > 0 || t.Rlist.Len() > 0 {411				yyerrorl(f.Pos, "func main must have no arguments and no return values")412			}413		}414	} else {415		f.Func.Shortname = name416		name = nblank.Sym // filled in by typecheckfunc417	}418	f.Func.Nname = newfuncnamel(p.pos(fun.Name), name)419	f.Func.Nname.Name.Defn = f420	f.Func.Nname.Name.Param.Ntype = t421	if pragma, ok := fun.Pragma.(*Pragma); ok {422		f.Func.Pragma = pragma.Flag & FuncPragmas423		if pragma.Flag&Systemstack != 0 && pragma.Flag&Nosplit != 0 {424			yyerrorl(f.Pos, "go:nosplit and go:systemstack cannot be combined")425		}426		pragma.Flag &^= FuncPragmas427		p.checkUnused(pragma)428	}429	if fun.Recv == nil {430		declare(f.Func.Nname, PFUNC)431	}432	p.funcBody(f, fun.Body)433	if fun.Body != nil {434		if f.Func.Pragma&Noescape != 0 {435			yyerrorl(f.Pos, "can only use //go:noescape with external func implementations")436		}437	} else {438		if pure_go || strings.HasPrefix(f.funcname(), "init.") {439			// Linknamed functions are allowed to have no body. Hopefully440			// the linkname target has a body. See issue 23311.441			isLinknamed := false442			for _, n := range p.linknames {443				if f.funcname() == n.local {444					isLinknamed = true445					break446				}447			}448			if !isLinknamed {449				yyerrorl(f.Pos, "missing function body")450			}451		}452	}453	return f454}455func (p *noder) signature(recv *syntax.Field, typ *syntax.FuncType) *Node {456	n := p.nod(typ, OTFUNC, nil, nil)457	if recv != nil {458		n.Left = p.param(recv, false, false)459	}460	n.List.Set(p.params(typ.ParamList, true))461	n.Rlist.Set(p.params(typ.ResultList, false))462	return n463}464func (p *noder) params(params []*syntax.Field, dddOk bool) []*Node {465	nodes := make([]*Node, 0, len(params))466	for i, param := range params {467		p.setlineno(param)468		nodes = append(nodes, p.param(param, dddOk, i+1 == len(params)))469	}470	return nodes471}472func (p *noder) param(param *syntax.Field, dddOk, final bool) *Node {473	var name *types.Sym474	if param.Name != nil {475		name = p.name(param.Name)476	}477	typ := p.typeExpr(param.Type)478	n := p.nodSym(param, ODCLFIELD, typ, name)479	// rewrite ...T parameter480	if typ.Op == ODDD {481		if !dddOk {482			// We mark these as syntax errors to get automatic elimination483			// of multiple such errors per line (see yyerrorl in subr.go).484			yyerror("syntax error: cannot use ... in receiver or result parameter list")485		} else if !final {486			if param.Name == nil {487				yyerror("syntax error: cannot use ... with non-final parameter")488			} else {489				p.yyerrorpos(param.Name.Pos(), "syntax error: cannot use ... with non-final parameter %s", param.Name.Value)490			}491		}492		typ.Op = OTARRAY493		typ.Right = typ.Left494		typ.Left = nil495		n.SetIsDDD(true)496		if n.Left != nil {497			n.Left.SetIsDDD(true)498		}499	}500	return n501}502func (p *noder) exprList(expr syntax.Expr) []*Node {503	if list, ok := expr.(*syntax.ListExpr); ok {504		return p.exprs(list.ElemList)505	}506	return []*Node{p.expr(expr)}507}508func (p *noder) exprs(exprs []syntax.Expr) []*Node {509	nodes := make([]*Node, 0, len(exprs))510	for _, expr := range exprs {511		nodes = append(nodes, p.expr(expr))512	}513	return nodes514}515func (p *noder) expr(expr syntax.Expr) *Node {516	p.setlineno(expr)517	switch expr := expr.(type) {518	case nil, *syntax.BadExpr:519		return nil520	case *syntax.Name:521		return p.mkname(expr)522	case *syntax.BasicLit:523		n := nodlit(p.basicLit(expr))524		n.SetDiag(expr.Bad) // avoid follow-on errors if there was a syntax error525		return n526	case *syntax.CompositeLit:527		n := p.nod(expr, OCOMPLIT, nil, nil)528		if expr.Type != nil {529			n.Right = p.expr(expr.Type)530		}531		l := p.exprs(expr.ElemList)532		for i, e := range l {533			l[i] = p.wrapname(expr.ElemList[i], e)534		}535		n.List.Set(l)536		lineno = p.makeXPos(expr.Rbrace)537		return n538	case *syntax.KeyValueExpr:539		// use position of expr.Key rather than of expr (which has position of ':')540		return p.nod(expr.Key, OKEY, p.expr(expr.Key), p.wrapname(expr.Value, p.expr(expr.Value)))541	case *syntax.FuncLit:542		return p.funcLit(expr)543	case *syntax.ParenExpr:544		return p.nod(expr, OPAREN, p.expr(expr.X), nil)545	case *syntax.SelectorExpr:546		// parser.new_dotname547		obj := p.expr(expr.X)548		if obj.Op == OPACK {549			obj.Name.SetUsed(true)550			return oldname(restrictlookup(expr.Sel.Value, obj.Name.Pkg))551		}552		n := nodSym(OXDOT, obj, p.name(expr.Sel))553		n.Pos = p.pos(expr) // lineno may have been changed by p.expr(expr.X)554		return n555	case *syntax.IndexExpr:556		return p.nod(expr, OINDEX, p.expr(expr.X), p.expr(expr.Index))557	case *syntax.SliceExpr:558		op := OSLICE559		if expr.Full {560			op = OSLICE3561		}562		n := p.nod(expr, op, p.expr(expr.X), nil)563		var index [3]*Node564		for i, x := range &expr.Index {565			if x != nil {566				index[i] = p.expr(x)567			}568		}569		n.SetSliceBounds(index[0], index[1], index[2])570		return n571	case *syntax.AssertExpr:572		return p.nod(expr, ODOTTYPE, p.expr(expr.X), p.typeExpr(expr.Type))573	case *syntax.Operation:574		if expr.Op == syntax.Add && expr.Y != nil {575			return p.sum(expr)576		}577		x := p.expr(expr.X)578		if expr.Y == nil {579			return p.nod(expr, p.unOp(expr.Op), x, nil)580		}581		return p.nod(expr, p.binOp(expr.Op), x, p.expr(expr.Y))582	case *syntax.CallExpr:583		n := p.nod(expr, OCALL, p.expr(expr.Fun), nil)584		n.List.Set(p.exprs(expr.ArgList))585		n.SetIsDDD(expr.HasDots)586		return n587	case *syntax.ArrayType:588		var len *Node589		if expr.Len != nil {590			len = p.expr(expr.Len)591		} else {592			len = p.nod(expr, ODDD, nil, nil)593		}594		return p.nod(expr, OTARRAY, len, p.typeExpr(expr.Elem))595	case *syntax.SliceType:596		return p.nod(expr, OTARRAY, nil, p.typeExpr(expr.Elem))597	case *syntax.DotsType:598		return p.nod(expr, ODDD, p.typeExpr(expr.Elem), nil)599	case *syntax.StructType:600		return p.structType(expr)601	case *syntax.InterfaceType:602		return p.interfaceType(expr)603	case *syntax.FuncType:604		return p.signature(nil, expr)605	case *syntax.MapType:606		return p.nod(expr, OTMAP, p.typeExpr(expr.Key), p.typeExpr(expr.Value))607	case *syntax.ChanType:608		n := p.nod(expr, OTCHAN, p.typeExpr(expr.Elem), nil)609		n.SetTChanDir(p.chanDir(expr.Dir))610		return n611	case *syntax.TypeSwitchGuard:612		n := p.nod(expr, OTYPESW, nil, p.expr(expr.X))613		if expr.Lhs != nil {614			n.Left = p.declName(expr.Lhs)615			if n.Left.isBlank() {616				yyerror("invalid variable name %v in type switch", n.Left)617			}618		}619		return n620	}621	panic("unhandled Expr")622}623// sum efficiently handles very large summation expressions (such as624// in issue #16394). In particular, it avoids left recursion and625// collapses string literals.626func (p *noder) sum(x syntax.Expr) *Node {627	// While we need to handle long sums with asymptotic628	// efficiency, the vast majority of sums are very small: ~95%629	// have only 2 or 3 operands, and ~99% of string literals are630	// never concatenated.631	adds := make([]*syntax.Operation, 0, 2)632	for {633		add, ok := x.(*syntax.Operation)634		if !ok || add.Op != syntax.Add || add.Y == nil {635			break636		}637		adds = append(adds, add)638		x = add.X639	}640	// nstr is the current rightmost string literal in the641	// summation (if any), and chunks holds its accumulated642	// substrings.643	//644	// Consider the expression x + "a" + "b" + "c" + y. When we645	// reach the string literal "a", we assign nstr to point to646	// its corresponding Node and initialize chunks to {"a"}.647	// Visiting the subsequent string literals "b" and "c", we648	// simply append their values to chunks. Finally, when we649	// reach the non-constant operand y, we'll join chunks to form650	// "abc" and reassign the "a" string literal's value.651	//652	// N.B., we need to be careful about named string constants653	// (indicated by Sym != nil) because 1) we can't modify their654	// value, as doing so would affect other uses of the string655	// constant, and 2) they may have types, which we need to656	// handle correctly. For now, we avoid these problems by657	// treating named string constants the same as non-constant658	// operands.659	var nstr *Node660	chunks := make([]string, 0, 1)661	n := p.expr(x)662	if Isconst(n, CTSTR) && n.Sym == nil {663		nstr = n664		chunks = append(chunks, strlit(nstr))665	}666	for i := len(adds) - 1; i >= 0; i-- {667		add := adds[i]668		r := p.expr(add.Y)669		if Isconst(r, CTSTR) && r.Sym == nil {670			if nstr != nil {671				// Collapse r into nstr instead of adding to n.672				chunks = append(chunks, strlit(r))673				continue674			}675			nstr = r676			chunks = append(chunks, strlit(nstr))677		} else {678			if len(chunks) > 1 {679				nstr.SetVal(Val{U: strings.Join(chunks, "")})680			}681			nstr = nil682			chunks = chunks[:0]683		}684		n = p.nod(add, OADD, n, r)685	}686	if len(chunks) > 1 {687		nstr.SetVal(Val{U: strings.Join(chunks, "")})688	}689	return n690}691func (p *noder) typeExpr(typ syntax.Expr) *Node {692	// TODO(mdempsky): Be stricter? typecheck should handle errors anyway.693	return p.expr(typ)694}695func (p *noder) typeExprOrNil(typ syntax.Expr) *Node {696	if typ != nil {697		return p.expr(typ)698	}699	return nil700}701func (p *noder) chanDir(dir syntax.ChanDir) types.ChanDir {702	switch dir {703	case 0:704		return types.Cboth705	case syntax.SendOnly:706		return types.Csend707	case syntax.RecvOnly:708		return types.Crecv709	}710	panic("unhandled ChanDir")711}712func (p *noder) structType(expr *syntax.StructType) *Node {713	l := make([]*Node, 0, len(expr.FieldList))714	for i, field := range expr.FieldList {715		p.setlineno(field)716		var n *Node717		if field.Name == nil {718			n = p.embedded(field.Type)719		} else {720			n = p.nodSym(field, ODCLFIELD, p.typeExpr(field.Type), p.name(field.Name))721		}722		if i < len(expr.TagList) && expr.TagList[i] != nil {723			n.SetVal(p.basicLit(expr.TagList[i]))724		}725		l = append(l, n)726	}727	p.setlineno(expr)728	n := p.nod(expr, OTSTRUCT, nil, nil)729	n.List.Set(l)730	return n731}732func (p *noder) interfaceType(expr *syntax.InterfaceType) *Node {733	l := make([]*Node, 0, len(expr.MethodList))734	for _, method := range expr.MethodList {735		p.setlineno(method)736		var n *Node737		if method.Name == nil {738			n = p.nodSym(method, ODCLFIELD, oldname(p.packname(method.Type)), nil)739		} else {740			mname := p.name(method.Name)741			sig := p.typeExpr(method.Type)742			sig.Left = fakeRecv()743			n = p.nodSym(method, ODCLFIELD, sig, mname)744			ifacedcl(n)745		}746		l = append(l, n)747	}748	n := p.nod(expr, OTINTER, nil, nil)749	n.List.Set(l)750	return n751}752func (p *noder) packname(expr syntax.Expr) *types.Sym {753	switch expr := expr.(type) {754	case *syntax.Name:755		name := p.name(expr)756		if n := oldname(name); n.Name != nil && n.Name.Pack != nil {757			n.Name.Pack.Name.SetUsed(true)758		}759		return name760	case *syntax.SelectorExpr:761		name := p.name(expr.X.(*syntax.Name))762		def := asNode(name.Def)763		if def == nil {764			yyerror("undefined: %v", name)765			return name766		}767		var pkg *types.Pkg768		if def.Op != OPACK {769			yyerror("%v is not a package", name)770			pkg = localpkg771		} else {772			def.Name.SetUsed(true)773			pkg = def.Name.Pkg774		}775		return restrictlookup(expr.Sel.Value, pkg)776	}777	panic(fmt.Sprintf("unexpected packname: %#v", expr))778}779func (p *noder) embedded(typ syntax.Expr) *Node {780	op, isStar := typ.(*syntax.Operation)781	if isStar {782		if op.Op != syntax.Mul || op.Y != nil {783			panic("unexpected Operation")784		}785		typ = op.X786	}787	sym := p.packname(typ)788	n := p.nodSym(typ, ODCLFIELD, oldname(sym), lookup(sym.Name))789	n.SetEmbedded(true)790	if isStar {791		n.Left = p.nod(op, ODEREF, n.Left, nil)792	}793	return n794}795func (p *noder) stmts(stmts []syntax.Stmt) []*Node {796	return p.stmtsFall(stmts, false)797}798func (p *noder) stmtsFall(stmts []syntax.Stmt, fallOK bool) []*Node {799	var nodes []*Node800	for i, stmt := range stmts {801		s := p.stmtFall(stmt, fallOK && i+1 == len(stmts))802		if s == nil {803		} else if s.Op == OBLOCK && s.Ninit.Len() == 0 {804			nodes = append(nodes, s.List.Slice()...)805		} else {806			nodes = append(nodes, s)807		}808	}809	return nodes810}811func (p *noder) stmt(stmt syntax.Stmt) *Node {812	return p.stmtFall(stmt, false)813}814func (p *noder) stmtFall(stmt syntax.Stmt, fallOK bool) *Node {815	p.setlineno(stmt)816	switch stmt := stmt.(type) {817	case *syntax.EmptyStmt:818		return nil819	case *syntax.LabeledStmt:820		return p.labeledStmt(stmt, fallOK)821	case *syntax.BlockStmt:822		l := p.blockStmt(stmt)823		if len(l) == 0 {824			// TODO(mdempsky): Line number?825			return nod(OEMPTY, nil, nil)826		}827		return liststmt(l)828	case *syntax.ExprStmt:829		return p.wrapname(stmt, p.expr(stmt.X))830	case *syntax.SendStmt:831		return p.nod(stmt, OSEND, p.expr(stmt.Chan), p.expr(stmt.Value))832	case *syntax.DeclStmt:833		return liststmt(p.decls(stmt.DeclList))834	case *syntax.AssignStmt:835		if stmt.Op != 0 && stmt.Op != syntax.Def {836			n := p.nod(stmt, OASOP, p.expr(stmt.Lhs), p.expr(stmt.Rhs))837			n.SetImplicit(stmt.Rhs == syntax.ImplicitOne)838			n.SetSubOp(p.binOp(stmt.Op))839			return n840		}841		n := p.nod(stmt, OAS, nil, nil) // assume common case842		rhs := p.exprList(stmt.Rhs)843		lhs := p.assignList(stmt.Lhs, n, stmt.Op == syntax.Def)844		if len(lhs) == 1 && len(rhs) == 1 {845			// common case846			n.Left = lhs[0]847			n.Right = rhs[0]848		} else {849			n.Op = OAS2850			n.List.Set(lhs)851			n.Rlist.Set(rhs)852		}853		return n854	case *syntax.BranchStmt:855		var op Op856		switch stmt.Tok {857		case syntax.Break:858			op = OBREAK859		case syntax.Continue:860			op = OCONTINUE861		case syntax.Fallthrough:862			if !fallOK {863				yyerror("fallthrough statement out of place")864			}865			op = OFALL866		case syntax.Goto:867			op = OGOTO868		default:869			panic("unhandled BranchStmt")870		}871		n := p.nod(stmt, op, nil, nil)872		if stmt.Label != nil {873			n.Sym = p.name(stmt.Label)874		}875		return n876	case *syntax.CallStmt:877		var op Op878		switch stmt.Tok {879		case syntax.Defer:880			op = ODEFER881		case syntax.Go:882			op = OGO883		default:884			panic("unhandled CallStmt")885		}886		return p.nod(stmt, op, p.expr(stmt.Call), nil)887	case *syntax.ReturnStmt:888		var results []*Node889		if stmt.Results != nil {890			results = p.exprList(stmt.Results)891		}892		n := p.nod(stmt, ORETURN, nil, nil)893		n.List.Set(results)894		if n.List.Len() == 0 && Curfn != nil {895			for _, ln := range Curfn.Func.Dcl {896				if ln.Class() == PPARAM {897					continue898				}899				if ln.Class() != PPARAMOUT {900					break901				}902				if asNode(ln.Sym.Def) != ln {903					yyerror("%s is shadowed during return", ln.Sym.Name)904				}905			}906		}907		return n908	case *syntax.IfStmt:909		return p.ifStmt(stmt)910	case *syntax.ForStmt:911		return p.forStmt(stmt)912	case *syntax.SwitchStmt:913		return p.switchStmt(stmt)914	case *syntax.SelectStmt:915		return p.selectStmt(stmt)916	}917	panic("unhandled Stmt")918}919func (p *noder) assignList(expr syntax.Expr, defn *Node, colas bool) []*Node {920	if !colas {921		return p.exprList(expr)922	}923	defn.SetColas(true)924	var exprs []syntax.Expr925	if list, ok := expr.(*syntax.ListExpr); ok {926		exprs = list.ElemList927	} else {928		exprs = []syntax.Expr{expr}929	}930	res := make([]*Node, len(exprs))931	seen := make(map[*types.Sym]bool, len(exprs))932	newOrErr := false933	for i, expr := range exprs {934		p.setlineno(expr)935		res[i] = nblank936		name, ok := expr.(*syntax.Name)937		if !ok {938			p.yyerrorpos(expr.Pos(), "non-name %v on left side of :=", p.expr(expr))939			newOrErr = true940			continue941		}942		sym := p.name(name)943		if sym.IsBlank() {944			continue945		}946		if seen[sym] {947			p.yyerrorpos(expr.Pos(), "%v repeated on left side of :=", sym)948			newOrErr = true949			continue950		}951		seen[sym] = true952		if sym.Block == types.Block {953			res[i] = oldname(sym)954			continue955		}956		newOrErr = true957		n := newname(sym)958		declare(n, dclcontext)959		n.Name.Defn = defn960		defn.Ninit.Append(nod(ODCL, n, nil))961		res[i] = n962	}963	if !newOrErr {964		yyerrorl(defn.Pos, "no new variables on left side of :=")965	}966	return res967}968func (p *noder) blockStmt(stmt *syntax.BlockStmt) []*Node {969	p.openScope(stmt.Pos())970	nodes := p.stmts(stmt.List)971	p.closeScope(stmt.Rbrace)972	return nodes973}974func (p *noder) ifStmt(stmt *syntax.IfStmt) *Node {975	p.openScope(stmt.Pos())976	n := p.nod(stmt, OIF, nil, nil)977	if stmt.Init != nil {978		n.Ninit.Set1(p.stmt(stmt.Init))979	}980	if stmt.Cond != nil {981		n.Left = p.expr(stmt.Cond)982	}983	n.Nbody.Set(p.blockStmt(stmt.Then))984	if stmt.Else != nil {985		e := p.stmt(stmt.Else)986		if e.Op == OBLOCK && e.Ninit.Len() == 0 {987			n.Rlist.Set(e.List.Slice())988		} else {989			n.Rlist.Set1(e)990		}991	}992	p.closeAnotherScope()993	return n994}995func (p *noder) forStmt(stmt *syntax.ForStmt) *Node {996	p.openScope(stmt.Pos())997	var n *Node998	if r, ok := stmt.Init.(*syntax.RangeClause); ok {999		if stmt.Cond != nil || stmt.Post != nil {1000			panic("unexpected RangeClause")1001		}1002		n = p.nod(r, ORANGE, nil, p.expr(r.X))1003		if r.Lhs != nil {1004			n.List.Set(p.assignList(r.Lhs, n, r.Def))1005		}1006	} else {1007		n = p.nod(stmt, OFOR, nil, nil)1008		if stmt.Init != nil {1009			n.Ninit.Set1(p.stmt(stmt.Init))1010		}1011		if stmt.Cond != nil {1012			n.Left = p.expr(stmt.Cond)1013		}1014		if stmt.Post != nil {1015			n.Right = p.stmt(stmt.Post)1016		}1017	}1018	n.Nbody.Set(p.blockStmt(stmt.Body))1019	p.closeAnotherScope()1020	return n1021}1022func (p *noder) switchStmt(stmt *syntax.SwitchStmt) *Node {1023	p.openScope(stmt.Pos())1024	n := p.nod(stmt, OSWITCH, nil, nil)1025	if stmt.Init != nil {1026		n.Ninit.Set1(p.stmt(stmt.Init))1027	}1028	if stmt.Tag != nil {1029		n.Left = p.expr(stmt.Tag)1030	}1031	tswitch := n.Left1032	if tswitch != nil && tswitch.Op != OTYPESW {1033		tswitch = nil1034	}1035	n.List.Set(p.caseClauses(stmt.Body, tswitch, stmt.Rbrace))1036	p.closeScope(stmt.Rbrace)1037	return n1038}1039func (p *noder) caseClauses(clauses []*syntax.CaseClause, tswitch *Node, rbrace syntax.Pos) []*Node {1040	nodes := make([]*Node, 0, len(clauses))1041	for i, clause := range clauses {1042		p.setlineno(clause)1043		if i > 0 {1044			p.closeScope(clause.Pos())1045		}1046		p.openScope(clause.Pos())1047		n := p.nod(clause, OCASE, nil, nil)1048		if clause.Cases != nil {1049			n.List.Set(p.exprList(clause.Cases))1050		}1051		if tswitch != nil && tswitch.Left != nil {1052			nn := newname(tswitch.Left.Sym)1053			declare(nn, dclcontext)1054			n.Rlist.Set1(nn)1055			// keep track of the instances for reporting unused1056			nn.Name.Defn = tswitch1057		}1058		// Trim trailing empty statements. We omit them from1059		// the Node AST anyway, and it's easier to identify1060		// out-of-place fallthrough statements without them.1061		body := clause.Body1062		for len(body) > 0 {1063			if _, ok := body[len(body)-1].(*syntax.EmptyStmt); !ok {1064				break1065			}1066			body = body[:len(body)-1]1067		}1068		n.Nbody.Set(p.stmtsFall(body, true))1069		if l := n.Nbody.Len(); l > 0 && n.Nbody.Index(l-1).Op == OFALL {1070			if tswitch != nil {1071				yyerror("cannot fallthrough in type switch")1072			}1073			if i+1 == len(clauses) {1074				yyerror("cannot fallthrough final case in switch")1075			}1076		}1077		nodes = append(nodes, n)1078	}1079	if len(clauses) > 0 {1080		p.closeScope(rbrace)1081	}1082	return nodes1083}1084func (p *noder) selectStmt(stmt *syntax.SelectStmt) *Node {1085	n := p.nod(stmt, OSELECT, nil, nil)1086	n.List.Set(p.commClauses(stmt.Body, stmt.Rbrace))1087	return n1088}1089func (p *noder) commClauses(clauses []*syntax.CommClause, rbrace syntax.Pos) []*Node {1090	nodes := make([]*Node, 0, len(clauses))1091	for i, clause := range clauses {1092		p.setlineno(clause)1093		if i > 0 {1094			p.closeScope(clause.Pos())1095		}1096		p.openScope(clause.Pos())1097		n := p.nod(clause, OCASE, nil, nil)1098		if clause.Comm != nil {1099			n.List.Set1(p.stmt(clause.Comm))1100		}1101		n.Nbody.Set(p.stmts(clause.Body))1102		nodes = append(nodes, n)1103	}1104	if len(clauses) > 0 {1105		p.closeScope(rbrace)1106	}1107	return nodes1108}1109func (p *noder) labeledStmt(label *syntax.LabeledStmt, fallOK bool) *Node {1110	lhs := p.nodSym(label, OLABEL, nil, p.name(label.Label))1111	var ls *Node1112	if label.Stmt != nil { // TODO(mdempsky): Should always be present.1113		ls = p.stmtFall(label.Stmt, fallOK)1114	}1115	lhs.Name.Defn = ls1116	l := []*Node{lhs}1117	if ls != nil {1118		if ls.Op == OBLOCK && ls.Ninit.Len() == 0 {1119			l = append(l, ls.List.Slice()...)1120		} else {1121			l = append(l, ls)1122		}1123	}1124	return liststmt(l)1125}1126var unOps = [...]Op{1127	syntax.Recv: ORECV,1128	syntax.Mul:  ODEREF,1129	syntax.And:  OADDR,1130	syntax.Not: ONOT,1131	syntax.Xor: OBITNOT,1132	syntax.Add: OPLUS,1133	syntax.Sub: ONEG,1134}1135func (p *noder) unOp(op syntax.Operator) Op {1136	if uint64(op) >= uint64(len(unOps)) || unOps[op] == 0 {1137		panic("invalid Operator")1138	}1139	return unOps[op]1140}1141var binOps = [...]Op{1142	syntax.OrOr:   OOROR,1143	syntax.AndAnd: OANDAND,1144	syntax.Eql: OEQ,1145	syntax.Neq: ONE,1146	syntax.Lss: OLT,1147	syntax.Leq: OLE,1148	syntax.Gtr: OGT,1149	syntax.Geq: OGE,1150	syntax.Add: OADD,1151	syntax.Sub: OSUB,1152	syntax.Or:  OOR,1153	syntax.Xor: OXOR,1154	syntax.Mul:    OMUL,1155	syntax.Div:    ODIV,1156	syntax.Rem:    OMOD,1157	syntax.And:    OAND,1158	syntax.AndNot: OANDNOT,1159	syntax.Shl:    OLSH,1160	syntax.Shr:    ORSH,1161}1162func (p *noder) binOp(op syntax.Operator) Op {1163	if uint64(op) >= uint64(len(binOps)) || binOps[op] == 0 {1164		panic("invalid Operator")1165	}1166	return binOps[op]1167}1168// checkLangCompat reports an error if the representation of a numeric1169// literal is not compatible with the current language version.1170func checkLangCompat(lit *syntax.BasicLit) {1171	s := lit.Value1172	if len(s) <= 2 || langSupported(1, 13, localpkg) {1173		return1174	}1175	// len(s) > 21176	if strings.Contains(s, "_") {1177		yyerrorv("go1.13", "underscores in numeric literals")1178		return1179	}1180	if s[0] != '0' {1181		return1182	}1183	base := s[1]1184	if base == 'b' || base == 'B' {1185		yyerrorv("go1.13", "binary literals")1186		return1187	}1188	if base == 'o' || base == 'O' {1189		yyerrorv("go1.13", "0o/0O-style octal literals")1190		return1191	}1192	if lit.Kind != syntax.IntLit && (base == 'x' || base == 'X') {1193		yyerrorv("go1.13", "hexadecimal floating-point literals")1194	}1195}1196func (p *noder) basicLit(lit *syntax.BasicLit) Val {1197	// We don't use the errors of the conversion routines to determine1198	// if a literal string is valid because the conversion routines may1199	// accept a wider syntax than the language permits. Rely on lit.Bad1200	// instead.1201	switch s := lit.Value; lit.Kind {1202	case syntax.IntLit:1203		checkLangCompat(lit)1204		x := new(Mpint)1205		if !lit.Bad {1206			x.SetString(s)1207		}1208		return Val{U: x}1209	case syntax.FloatLit:1210		checkLangCompat(lit)1211		x := newMpflt()1212		if !lit.Bad {1213			x.SetString(s)1214		}1215		return Val{U: x}1216	case syntax.ImagLit:1217		checkLangCompat(lit)1218		x := newMpcmplx()1219		if !lit.Bad {1220			x.Imag.SetString(strings.TrimSuffix(s, "i"))1221		}1222		return Val{U: x}1223	case syntax.RuneLit:1224		x := new(Mpint)1225		x.Rune = true1226		if !lit.Bad {1227			u, _ := strconv.Unquote(s)1228			var r rune1229			if len(u) == 1 {1230				r = rune(u[0])1231			} else {1232				r, _ = utf8.DecodeRuneInString(u)1233			}1234			x.SetInt64(int64(r))1235		}1236		return Val{U: x}1237	case syntax.StringLit:1238		var x string1239		if !lit.Bad {1240			if len(s) > 0 && s[0] == '`' {1241				// strip carriage returns from raw string1242				s = strings.Replace(s, "\r", "", -1)1243			}1244			x, _ = strconv.Unquote(s)1245		}1246		return Val{U: x}1247	default:1248		panic("unhandled BasicLit kind")1249	}1250}1251func (p *noder) name(name *syntax.Name) *types.Sym {1252	return lookup(name.Value)1253}1254func (p *noder) mkname(name *syntax.Name) *Node {1255	// TODO(mdempsky): Set line number?1256	return mkname(p.name(name))1257}1258func (p *noder) newname(name *syntax.Name) *Node {1259	// TODO(mdempsky): Set line number?1260	return newname(p.name(name))1261}1262func (p *noder) wrapname(n syntax.Node, x *Node) *Node {1263	// These nodes do not carry line numbers.1264	// Introduce a wrapper node to give them the correct line.1265	switch x.Op {1266	case OTYPE, OLITERAL:1267		if x.Sym == nil {1268			break1269		}1270		fallthrough1271	case ONAME, ONONAME, OPACK:1272		x = p.nod(n, OPAREN, x, nil)1273		x.SetImplicit(true)1274	}1275	return x1276}1277func (p *noder) nod(orig syntax.Node, op Op, left, right *Node) *Node {1278	return nodl(p.pos(orig), op, left, right)1279}1280func (p *noder) nodSym(orig syntax.Node, op Op, left *Node, sym *types.Sym) *Node {1281	n := nodSym(op, left, sym)1282	n.Pos = p.pos(orig)1283	return n1284}1285func (p *noder) pos(n syntax.Node) src.XPos {1286	// TODO(gri): orig.Pos() should always be known - fix package syntax1287	xpos := lineno1288	if pos := n.Pos(); pos.IsKnown() {1289		xpos = p.makeXPos(pos)1290	}1291	return xpos1292}1293func (p *noder) setlineno(n syntax.Node) {1294	if n != nil {1295		lineno = p.pos(n)1296	}1297}1298// error is called concurrently if files are parsed concurrently.1299func (p *noder) error(err error) {1300	p.err <- err.(syntax.Error)1301}1302// pragmas that are allowed in the std lib, but don't have1303// a syntax.Pragma value (see lex.go) associated with them.1304var allowedStdPragmas = map[string]bool{1305	"go:cgo_export_static":  true,1306	"go:cgo_export_dynamic": true,1307	"go:cgo_import_static":  true,1308	"go:cgo_import_dynamic": true,1309	"go:cgo_ldflag":         true,1310	"go:cgo_dynamic_linker": true,1311	"go:generate":           true,1312}1313// *Pragma is the value stored in a syntax.Pragma during parsing.1314type Pragma struct {1315	Flag PragmaFlag  // collected bits1316	Pos  []PragmaPos // position of each individual flag1317}1318type PragmaPos struct {1319	Flag PragmaFlag1320	Pos  syntax.Pos1321}1322func (p *noder) checkUnused(pragma *Pragma) {1323	for _, pos := range pragma.Pos {1324		if pos.Flag&pragma.Flag != 0 {1325			p.yyerrorpos(pos.Pos, "misplaced compiler directive")1326		}1327	}1328}1329func (p *noder) checkUnusedDuringParse(pragma *Pragma) {1330	for _, pos := range pragma.Pos {1331		if pos.Flag&pragma.Flag != 0 {1332			p.error(syntax.Error{Pos: pos.Pos, Msg: "misplaced compiler directive"})1333		}1334	}1335}1336// pragma is called concurrently if files are parsed concurrently.1337func (p *noder) pragma(pos syntax.Pos, blankLine bool, text string, old syntax.Pragma) syntax.Pragma {1338	pragma, _ := old.(*Pragma)1339	if pragma == nil {1340		pragma = new(Pragma)1341	}1342	if text == "" {1343		// unused pragma; only called with old != nil.1344		p.checkUnusedDuringParse(pragma)1345		return nil1346	}1347	if strings.HasPrefix(text, "line ") {1348		// line directives are handled by syntax package1349		panic("unreachable")1350	}1351	if !blankLine {1352		// directive must be on line by itself1353		p.error(syntax.Error{Pos: pos, Msg: "misplaced compiler directive"})1354		return pragma1355	}1356	switch {1357	case strings.HasPrefix(text, "go:linkname "):1358		f := strings.Fields(text)...

compiler.go

Source:compiler.go

1/*---------------------------------------------------------------------------------------------2 *  Copyright (c) Peter Bjorklund. All rights reserved.3 *  Licensed under the MIT License. See LICENSE in the project root for license information.4 *--------------------------------------------------------------------------------------------*/5package swampcompiler6import (7	"fmt"8	"log"9	"os"10	"path"11	"path/filepath"12	deccy "github.com/swamp/compiler/src/decorated"13	"github.com/swamp/compiler/src/decorated/decshared"14	decorated "github.com/swamp/compiler/src/decorated/expression"15	dectype "github.com/swamp/compiler/src/decorated/types"16	"github.com/swamp/compiler/src/environment"17	"github.com/swamp/compiler/src/file"18	"github.com/swamp/compiler/src/generate"19	"github.com/swamp/compiler/src/generate_ir"20	"github.com/swamp/compiler/src/generate_sp"21	"github.com/swamp/compiler/src/loader"22	"github.com/swamp/compiler/src/parser"23	"github.com/swamp/compiler/src/resourceid"24	"github.com/swamp/compiler/src/solution"25	"github.com/swamp/compiler/src/verbosity"26)27func CheckUnused(world *loader.Package) decshared.DecoratedError {28	var appendedError decshared.DecoratedError29	for _, module := range world.AllModules() {30		if module.IsInternal() {31			continue32		}33		for _, def := range module.LocalDefinitions().Definitions() {34			if !def.WasReferenced() {35				warning := decorated.NewUnusedWarning(def)36				appendedError = decorated.AppendError(appendedError, warning)37			}38		}39		for _, def := range module.LocalTypes().AllInOrderTypes() {40			if !def.RealType().WasReferenced() {41				warning := decorated.NewUnusedTypeWarning(def.RealType())42				appendedError = decorated.AppendError(appendedError, warning)43			}44		}45		for _, importModule := range module.ImportedModules().AllInOrderModules() {46			if !importModule.ImportStatementInModule().WasReferenced() && importModule.ImportStatementInModule().AstImport().ModuleName().ModuleName() != "" {47				//warning := decorated.NewUnusedImportStatementWarning(importModule.ImportStatementInModule())48				//module.AddWarning(warning)49			}50		}51	}52	return appendedError53}54type Target uint855const (56	SwampOpcode Target = iota57	LlvmIr58)59func BuildMain(mainSourceFile string, absoluteOutputDirectory string, enforceStyle bool, showAssembler bool, target Target, verboseFlag verbosity.Verbosity) ([]*loader.Package, error) {60	statInfo, statErr := os.Stat(mainSourceFile)61	if statErr != nil {62		return nil, statErr63	}64	config, _, configErr := environment.LoadFromConfig()65	if configErr != nil {66		return nil, configErr67	}68	if statInfo.IsDir() {69		resourceNameLookup := resourceid.NewResourceNameLookupImpl()70		if solutionSettings, err := solution.LoadIfExists(mainSourceFile); err == nil {71			var packages []*loader.Package72			var errors decshared.DecoratedError73			var gen generate.Generator74			if target == LlvmIr {75				gen = generate_ir.NewGenerator()76			} else {77				gen = generate_sp.NewGenerator()78			}79			for _, packageSubDirectoryName := range solutionSettings.Packages {80				absoluteSubDirectory := path.Join(mainSourceFile, packageSubDirectoryName)81				compiledPackage, compileAndLinkErr := CompileAndLink(gen, resourceNameLookup, config, packageSubDirectoryName, absoluteSubDirectory, absoluteOutputDirectory, enforceStyle, verboseFlag)82				errors = decorated.AppendError(errors, compileAndLinkErr)83				if parser.IsCompileError(compileAndLinkErr) {84					return packages, errors85				}86				packages = append(packages, compiledPackage)87			}88			return packages, errors89		} else {90			return nil, fmt.Errorf("must have a solution file in this version")91		}92	}93	return nil, fmt.Errorf("must be directory in this version %v %v", mainSourceFile, absoluteOutputDirectory)94}95func BuildMainOnlyCompile(mainSourceFile string, enforceStyle bool, verboseFlag verbosity.Verbosity) ([]*loader.Package, error) {96	statInfo, statErr := os.Stat(mainSourceFile)97	if statErr != nil {98		return nil, statErr99	}100	config, _, configErr := environment.LoadFromConfig()101	if configErr != nil {102		return nil, configErr103	}104	if !statInfo.IsDir() {105		return nil, fmt.Errorf("must have a solution file in this version")106	} else {107		if solutionSettings, err := solution.LoadIfExists(mainSourceFile); err == nil {108			var packages []*loader.Package109			for _, packageSubDirectoryName := range solutionSettings.Packages {110				absoluteSubDirectory := path.Join(mainSourceFile, packageSubDirectoryName)111				compiledPackage, err := CompileMainDefaultDocumentProvider(packageSubDirectoryName, absoluteSubDirectory, config, enforceStyle, verboseFlag)112				if parser.IsCompileError(err) {113					return packages, err114				}115				packages = append(packages, compiledPackage)116			}117			return packages, nil118		}119	}120	return nil, fmt.Errorf("must be directory in this version %v", mainSourceFile)121}122func CompileMain(name string, mainSourceFile string, documentProvider loader.DocumentProvider, configuration environment.Environment, enforceStyle bool, verboseFlag verbosity.Verbosity) (*loader.Package, *decorated.Module, decshared.DecoratedError) {123	mainPrefix := mainSourceFile124	if file.IsDir(mainSourceFile) {125	} else {126		mainPrefix = path.Dir(mainSourceFile)127	}128	world := loader.NewPackage(loader.LocalFileSystemRoot(mainPrefix), name)129	worldDecorator, worldDecoratorErr := loader.NewWorldDecorator(enforceStyle, verboseFlag)130	if parser.IsCompileErr(worldDecoratorErr) {131		return nil, nil, worldDecoratorErr132	}133	var appendedError decshared.DecoratedError134	appendedError = decorated.AppendError(appendedError, worldDecoratorErr)135	/*136		for _, rootModule := range worldDecorator.ImportModules() {137			world.AddModule(rootModule.FullyQualifiedModuleName(), rootModule)138		}139	*/140	mainNamespace := dectype.MakePackageRootModuleName(nil)141	rootPackage := NewPackageLoader(mainPrefix, documentProvider, mainNamespace, world, worldDecorator)142	libraryReader := loader.NewLibraryReaderAndDecorator()143	libraryModule, libErr := libraryReader.ReadLibraryModule(decorated.ModuleTypeNormal, world, rootPackage.repository, mainSourceFile, mainNamespace, documentProvider, configuration)144	if parser.IsCompileErr(libErr) {145		return nil, nil, libErr146	}147	appendedError = decorated.AppendError(appendedError, libErr)148	unusedErrors := CheckUnused(world)149	appendedError = decorated.AppendError(appendedError, unusedErrors)150	rootModule, err := deccy.CreateDefaultRootModule(true)151	if parser.IsCompileError(err) {152		return nil, nil, err153	}154	appendedError = decorated.AppendError(appendedError, err)155	for _, importedRootSubModule := range rootModule.ImportedModules().AllInOrderModules() {156		world.AddModule(importedRootSubModule.ReferencedModule().FullyQualifiedModuleName(), importedRootSubModule.ReferencedModule())157	}158	// world.AddModule(dectype.MakeArtifactFullyQualifiedModuleName(nil), rootModule)159	return world, libraryModule, appendedError160}161func CompileMainFindLibraryRoot(mainSource string, documentProvider loader.DocumentProvider, configuration environment.Environment, enforceStyle bool, verboseFlag verbosity.Verbosity) (*loader.Package, *decorated.Module, error) {162	if !file.IsDir(mainSource) {163		mainSource = filepath.Dir(mainSource)164	}165	libraryDirectory, libraryErr := loader.FindSettingsDirectory(mainSource)166	if libraryErr != nil {167		return nil, nil, fmt.Errorf("couldn't find settings directory when compiling %w", libraryErr)168	}169	return CompileMain(mainSource, libraryDirectory, documentProvider, configuration, enforceStyle, verboseFlag)170}171type CoreFunctionInfo struct {172	Name       string173	ParamCount uint174}175func align(offset dectype.MemoryOffset, memoryAlign dectype.MemoryAlign) dectype.MemoryOffset {176	rest := dectype.MemoryAlign(uint32(offset) % uint32(memoryAlign))177	if rest != 0 {178		offset += dectype.MemoryOffset(memoryAlign - rest)179	}180	return offset181}182func GenerateAndLink(gen generate.Generator, resourceNameLookup resourceid.ResourceNameLookup, compiledPackage *loader.Package, outputDirectory string, packageSubDirectory string, verboseFlag verbosity.Verbosity) decshared.DecoratedError {183	for _, module := range compiledPackage.AllModules() {184		if verboseFlag >= verbosity.High {185			log.Printf(">>> has module %v\n", module.FullyQualifiedModuleName())186		}187	}188	genErr := gen.GenerateFromPackageAndWriteOutput(compiledPackage, resourceNameLookup, outputDirectory, packageSubDirectory, verboseFlag)189	if genErr != nil {190		return decorated.NewInternalError(genErr)191	}192	return nil193}194func CompileMainDefaultDocumentProvider(name string, filename string, configuration environment.Environment,195	enforceStyle bool, verboseFlag verbosity.Verbosity) (*loader.Package, decshared.DecoratedError) {196	defaultDocumentProvider := loader.NewFileSystemDocumentProvider()197	compiledPackage, _, moduleErr := CompileMain(name, filename, defaultDocumentProvider, configuration, enforceStyle, verboseFlag)198	if moduleErr != nil {199		return compiledPackage, moduleErr200	}201	return compiledPackage, nil202}203func CompileAndLink(gen generate.Generator, resourceNameLookup resourceid.ResourceNameLookup, configuration environment.Environment, name string,204	filename string, outputFilename string, enforceStyle bool, verboseFlag verbosity.Verbosity) (*loader.Package, decshared.DecoratedError) {205	var errors decshared.DecoratedError206	compiledPackage, compileErr := CompileMainDefaultDocumentProvider(name, filename, configuration, enforceStyle, verboseFlag)207	if parser.IsCompileError(compileErr) {208		return nil, compileErr209	}210	errors = decorated.AppendError(errors, compileErr)211	if compiledPackage == nil {212		panic("not possible")213	}214	linkErr := GenerateAndLink(gen, resourceNameLookup, compiledPackage, outputFilename, name, verboseFlag)215	errors = decorated.AppendError(errors, linkErr)216	return compiledPackage, errors217}...

checkUnused

Using AI Code Generation

1import (2func main() {3	import "fmt"4	func main() {5		fmt.Println("Hello, playground")6	}7	f, err := parser.ParseFile(fset, "", src, parser.ImportsOnly)8	if err != nil {9		log.Fatal(err)10	}11	for _, s := range f.Imports {12		fmt.Println(s.Path.Value)13	}14}15import (16func main() {17	import "fmt"18	func main() {19		fmt.Println("Hello, playground")20	}21	f, err := parser.ParseFile(fset, "", src, parser.ImportsOnly)22	if err != nil {23		log.Fatal(err)24	}25	for _, s := range f.Imports {26		fmt.Println(s.Path.Value)27	}28}29import (30func main() {31	import "fmt"32	func main() {33		fmt.Println("Hello, playground")34	}35	f, err := parser.ParseFile(fset, "", src, parser.ImportsOnly)36	if err != nil {37		log.Fatal(err)38	}39	for _, s := range f.Imports {40		fmt.Println(s.Path.Value)41	}42}43import (

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