Esempio n. 1
0
func (c *compiler) makeInterface(v *LLVMValue, iface types.Type) *LLVMValue {
	llv := v.LLVMValue()
	lltyp := llv.Type()
	i8ptr := llvm.PointerType(llvm.Int8Type(), 0)
	if lltyp.TypeKind() == llvm.PointerTypeKind {
		llv = c.builder.CreateBitCast(llv, i8ptr, "")
	} else {
		// If the value fits exactly in a pointer, then we can just
		// bitcast it. Otherwise we need to malloc.
		if c.target.TypeStoreSize(lltyp) <= uint64(c.target.PointerSize()) {
			bits := c.target.TypeSizeInBits(lltyp)
			if bits > 0 {
				llv = coerce(c.builder, llv, llvm.IntType(int(bits)))
				llv = c.builder.CreateIntToPtr(llv, i8ptr, "")
			} else {
				llv = llvm.ConstNull(i8ptr)
			}
		} else {
			ptr := c.createTypeMalloc(lltyp)
			c.builder.CreateStore(llv, ptr)
			llv = c.builder.CreateBitCast(ptr, i8ptr, "")
		}
	}
	value := llvm.Undef(c.types.ToLLVM(iface))
	rtype := c.types.ToRuntime(v.Type())
	rtype = c.builder.CreateBitCast(rtype, llvm.PointerType(llvm.Int8Type(), 0), "")
	value = c.builder.CreateInsertValue(value, rtype, 0, "")
	value = c.builder.CreateInsertValue(value, llv, 1, "")
	if iface.Underlying().(*types.Interface).NumMethods() > 0 {
		result := c.NewValue(value, types.NewInterface(nil, nil))
		result, _ = result.convertE2I(iface)
		return result
	}
	return c.NewValue(value, iface)
}
Esempio n. 2
0
// convertI2E converts a non-empty interface value to an empty interface.
func (v *LLVMValue) convertI2E() *LLVMValue {
	c := v.compiler
	f := c.runtime.convertI2E.LLVMValue()
	args := []llvm.Value{coerce(c.builder, v.LLVMValue(), c.runtime.iface.llvm)}
	typ := types.NewInterface(nil, nil)
	return c.NewValue(coerce(c.builder, c.builder.CreateCall(f, args, ""), c.llvmtypes.ToLLVM(typ)), typ)
}
// InterfaceType = "interface" "{" [ MethodList ] "}" .
// MethodList    = Method { ";" Method } .
// Method        = Name Signature .
//
// The methods of embedded interfaces are always "inlined"
// by the compiler and thus embedded interfaces are never
// visible in the export data.
//
func (p *parser) parseInterfaceType() types.Type {
	var methods []*types.Func

	p.expectKeyword("interface")
	p.expect('{')
	for i := 0; p.tok != '}' && p.tok != scanner.EOF; i++ {
		if i > 0 {
			p.expect(';')
		}
		pkg, name := p.parseName(true)
		sig := p.parseSignature(nil)
		methods = append(methods, types.NewFunc(token.NoPos, pkg, name, sig))
	}
	p.expect('}')

	return types.NewInterface(methods, nil)
}
Esempio n. 4
0
// InterfaceType = "interface" "{" [ MethodList ] "}" .
// MethodList    = Method { ";" Method } .
// Method        = Name Signature .
//
// The methods of embedded interfaces are always "inlined"
// by the compiler and thus embedded interfaces are never
// visible in the export data.
//
func (p *parser) parseInterfaceType() types.Type {
	var methods []*types.Func

	p.expectKeyword("interface")
	p.expect('{')
	for i := 0; p.tok != '}' && p.tok != scanner.EOF; i++ {
		if i > 0 {
			p.expect(';')
		}
		pkg, name := p.parseName(true)
		sig := p.parseSignature(nil)
		methods = append(methods, types.NewFunc(token.NoPos, pkg, name, sig))
	}
	p.expect('}')

	// Complete requires the type's embedded interfaces to be fully defined,
	// but we do not define any
	return types.NewInterface(methods, nil).Complete()
}
Esempio n. 5
0
// InterfaceType = "interface" "{" { ("?" Type | Func) ";" } "}" .
func (p *parser) parseInterfaceType(pkg *types.Package) types.Type {
	p.expectKeyword("interface")

	var methods []*types.Func
	var typs []*types.Named

	p.expect('{')
	for p.tok != '}' && p.tok != scanner.EOF {
		if p.tok == '?' {
			p.next()
			typs = append(typs, p.parseType(pkg).(*types.Named))
		} else {
			method := p.parseFunc(pkg)
			methods = append(methods, method)
		}
		p.expect(';')
	}
	p.expect('}')

	return types.NewInterface(methods, typs)
}
Esempio n. 6
0
func (c *funcContext) translateStmt(stmt ast.Stmt, label string) {
	c.WritePos(stmt.Pos())

	switch s := stmt.(type) {
	case *ast.BlockStmt:
		c.printLabel(label)
		c.translateStmtList(s.List)

	case *ast.IfStmt:
		c.printLabel(label)
		if s.Init != nil {
			c.translateStmt(s.Init, "")
		}
		var caseClauses []ast.Stmt
		ifStmt := s
		for {
			caseClauses = append(caseClauses, &ast.CaseClause{List: []ast.Expr{ifStmt.Cond}, Body: ifStmt.Body.List})
			switch elseStmt := ifStmt.Else.(type) {
			case *ast.IfStmt:
				if elseStmt.Init != nil {
					caseClauses = append(caseClauses, &ast.CaseClause{List: nil, Body: []ast.Stmt{elseStmt}})
					break
				}
				ifStmt = elseStmt
				continue
			case *ast.BlockStmt:
				caseClauses = append(caseClauses, &ast.CaseClause{List: nil, Body: elseStmt.List})
			case *ast.EmptyStmt, nil:
				// no else clause
			default:
				panic(fmt.Sprintf("Unhandled else: %T\n", elseStmt))
			}
			break
		}
		c.translateBranchingStmt(caseClauses, false, c.translateExpr, nil, "", c.flattened[s])

	case *ast.SwitchStmt:
		if s.Init != nil {
			c.translateStmt(s.Init, "")
		}
		translateCond := func(cond ast.Expr) *expression {
			return c.translateExpr(cond)
		}
		if s.Tag != nil {
			refVar := c.newVariable("_ref")
			c.Printf("%s = %s;", refVar, c.translateExpr(s.Tag))
			translateCond = func(cond ast.Expr) *expression {
				return c.translateExpr(&ast.BinaryExpr{
					X:  c.newIdent(refVar, c.p.info.Types[s.Tag].Type),
					Op: token.EQL,
					Y:  cond,
				})
			}
		}
		c.translateBranchingStmt(s.Body.List, true, translateCond, nil, label, c.flattened[s])

	case *ast.TypeSwitchStmt:
		if s.Init != nil {
			c.translateStmt(s.Init, "")
		}
		var expr ast.Expr
		var typeSwitchVar string
		switch a := s.Assign.(type) {
		case *ast.AssignStmt:
			expr = a.Rhs[0].(*ast.TypeAssertExpr).X
			typeSwitchVar = c.newVariable(a.Lhs[0].(*ast.Ident).Name)
			for _, caseClause := range s.Body.List {
				c.p.objectVars[c.p.info.Implicits[caseClause]] = typeSwitchVar
			}
		case *ast.ExprStmt:
			expr = a.X.(*ast.TypeAssertExpr).X
		}
		refVar := c.newVariable("_ref")
		c.Printf("%s = %s;", refVar, c.translateExpr(expr))
		translateCond := func(cond ast.Expr) *expression {
			if types.Identical(c.p.info.Types[cond].Type, types.Typ[types.UntypedNil]) {
				return c.formatExpr("%s === $ifaceNil", refVar)
			}
			return c.formatExpr("$assertType(%s, %s, true)[1]", refVar, c.typeName(c.p.info.Types[cond].Type))
		}
		printCaseBodyPrefix := func(index int) {
			if typeSwitchVar == "" {
				return
			}
			value := refVar
			if conds := s.Body.List[index].(*ast.CaseClause).List; len(conds) == 1 {
				t := c.p.info.Types[conds[0]].Type
				if _, isInterface := t.Underlying().(*types.Interface); !isInterface && !types.Identical(t, types.Typ[types.UntypedNil]) {
					value += ".$val"
				}
			}
			c.Printf("%s = %s;", typeSwitchVar, value)
		}
		c.translateBranchingStmt(s.Body.List, true, translateCond, printCaseBodyPrefix, label, c.flattened[s])

	case *ast.ForStmt:
		if s.Init != nil {
			c.translateStmt(s.Init, "")
		}
		cond := "true"
		if s.Cond != nil {
			cond = c.translateExpr(s.Cond).String()
		}
		c.translateLoopingStmt(cond, s.Body, nil, func() {
			if s.Post != nil {
				c.translateStmt(s.Post, "")
			}
		}, label, c.flattened[s])

	case *ast.RangeStmt:
		refVar := c.newVariable("_ref")
		c.Printf("%s = %s;", refVar, c.translateExpr(s.X))

		switch t := c.p.info.Types[s.X].Type.Underlying().(type) {
		case *types.Basic:
			iVar := c.newVariable("_i")
			c.Printf("%s = 0;", iVar)
			runeVar := c.newVariable("_rune")
			c.translateLoopingStmt(iVar+" < "+refVar+".length", s.Body, func() {
				c.Printf("%s = $decodeRune(%s, %s);", runeVar, refVar, iVar)
				if !isBlank(s.Key) {
					c.Printf("%s", c.translateAssign(s.Key, iVar, types.Typ[types.Int], s.Tok == token.DEFINE))
				}
				if !isBlank(s.Value) {
					c.Printf("%s", c.translateAssign(s.Value, runeVar+"[0]", types.Typ[types.Rune], s.Tok == token.DEFINE))
				}
			}, func() {
				c.Printf("%s += %s[1];", iVar, runeVar)
			}, label, c.flattened[s])

		case *types.Map:
			iVar := c.newVariable("_i")
			c.Printf("%s = 0;", iVar)
			keysVar := c.newVariable("_keys")
			c.Printf("%s = $keys(%s);", keysVar, refVar)
			c.translateLoopingStmt(iVar+" < "+keysVar+".length", s.Body, func() {
				entryVar := c.newVariable("_entry")
				c.Printf("%s = %s[%s[%s]];", entryVar, refVar, keysVar, iVar)
				if !isBlank(s.Key) {
					c.Printf("%s", c.translateAssign(s.Key, entryVar+".k", t.Key(), s.Tok == token.DEFINE))
				}
				if !isBlank(s.Value) {
					c.Printf("%s", c.translateAssign(s.Value, entryVar+".v", t.Elem(), s.Tok == token.DEFINE))
				}
			}, func() {
				c.Printf("%s++;", iVar)
			}, label, c.flattened[s])

		case *types.Array, *types.Pointer, *types.Slice:
			var length string
			var elemType types.Type
			switch t2 := t.(type) {
			case *types.Array:
				length = fmt.Sprintf("%d", t2.Len())
				elemType = t2.Elem()
			case *types.Pointer:
				length = fmt.Sprintf("%d", t2.Elem().Underlying().(*types.Array).Len())
				elemType = t2.Elem().Underlying().(*types.Array).Elem()
			case *types.Slice:
				length = refVar + ".$length"
				elemType = t2.Elem()
			}
			iVar := c.newVariable("_i")
			c.Printf("%s = 0;", iVar)
			c.translateLoopingStmt(iVar+" < "+length, s.Body, func() {
				if !isBlank(s.Key) {
					c.Printf("%s", c.translateAssign(s.Key, iVar, types.Typ[types.Int], s.Tok == token.DEFINE))
				}
				if !isBlank(s.Value) {
					c.Printf("%s", c.translateAssign(s.Value, c.translateImplicitConversion(c.setType(&ast.IndexExpr{
						X:     c.newIdent(refVar, t),
						Index: c.newIdent(iVar, types.Typ[types.Int]),
					}, elemType), elemType).String(), elemType, s.Tok == token.DEFINE))
				}
			}, func() {
				c.Printf("%s++;", iVar)
			}, label, c.flattened[s])

		case *types.Chan:
			okVar := c.newIdent(c.newVariable("_ok"), types.Typ[types.Bool])
			forStmt := &ast.ForStmt{
				Body: &ast.BlockStmt{
					List: []ast.Stmt{
						&ast.AssignStmt{
							Lhs: []ast.Expr{
								s.Key,
								okVar,
							},
							Rhs: []ast.Expr{
								c.setType(&ast.UnaryExpr{X: c.newIdent(refVar, t), Op: token.ARROW}, types.NewTuple(types.NewVar(0, nil, "", t.Elem()), types.NewVar(0, nil, "", types.Typ[types.Bool]))),
							},
							Tok: s.Tok,
						},
						&ast.IfStmt{
							Cond: &ast.UnaryExpr{X: okVar, Op: token.NOT},
							Body: &ast.BlockStmt{List: []ast.Stmt{&ast.BranchStmt{Tok: token.BREAK}}},
						},
						s.Body,
					},
				},
			}
			c.flattened[forStmt] = true
			c.translateStmt(forStmt, label)

		default:
			panic("")
		}

	case *ast.BranchStmt:
		c.printLabel(label)
		labelSuffix := ""
		data := c.flowDatas[""]
		if s.Label != nil {
			labelSuffix = " " + s.Label.Name
			data = c.flowDatas[s.Label.Name]
		}
		switch s.Tok {
		case token.BREAK:
			c.PrintCond(data.endCase == 0, fmt.Sprintf("break%s;", labelSuffix), fmt.Sprintf("$s = %d; continue;", data.endCase))
		case token.CONTINUE:
			data.postStmt()
			c.PrintCond(data.beginCase == 0, fmt.Sprintf("continue%s;", labelSuffix), fmt.Sprintf("$s = %d; continue;", data.beginCase))
		case token.GOTO:
			c.PrintCond(false, "goto "+s.Label.Name, fmt.Sprintf("$s = %d; continue;", c.labelCases[s.Label.Name]))
		case token.FALLTHROUGH:
			// handled in CaseClause
		default:
			panic("Unhandled branch statment: " + s.Tok.String())
		}

	case *ast.ReturnStmt:
		c.printLabel(label)
		results := s.Results
		if c.resultNames != nil {
			if len(s.Results) != 0 {
				c.translateStmt(&ast.AssignStmt{
					Lhs: c.resultNames,
					Tok: token.ASSIGN,
					Rhs: s.Results,
				}, "")
			}
			results = c.resultNames
		}
		switch len(results) {
		case 0:
			c.Printf("return;")
		case 1:
			if c.sig.Results().Len() > 1 {
				c.Printf("return %s;", c.translateExpr(results[0]))
				return
			}
			v := c.translateImplicitConversion(results[0], c.sig.Results().At(0).Type())
			c.delayedOutput = nil
			c.Printf("return %s;", v)
		default:
			values := make([]string, len(results))
			for i, result := range results {
				values[i] = c.translateImplicitConversion(result, c.sig.Results().At(i).Type()).String()
			}
			c.delayedOutput = nil
			c.Printf("return [%s];", strings.Join(values, ", "))
		}

	case *ast.DeferStmt:
		c.printLabel(label)
		isBuiltin := false
		isJs := false
		switch fun := s.Call.Fun.(type) {
		case *ast.Ident:
			var builtin *types.Builtin
			builtin, isBuiltin = c.p.info.Uses[fun].(*types.Builtin)
			if isBuiltin && builtin.Name() == "recover" {
				c.Printf("$deferred.push([$recover, []]);")
				return
			}
		case *ast.SelectorExpr:
			isJs = isJsPackage(c.p.info.Uses[fun.Sel].Pkg())
		}
		if isBuiltin || isJs {
			args := make([]ast.Expr, len(s.Call.Args))
			for i, arg := range s.Call.Args {
				args[i] = c.newIdent(c.newVariable("_arg"), c.p.info.Types[arg].Type)
			}
			call := c.translateExpr(&ast.CallExpr{
				Fun:      s.Call.Fun,
				Args:     args,
				Ellipsis: s.Call.Ellipsis,
			})
			c.Printf("$deferred.push([function(%s) { %s; }, [%s]]);", strings.Join(c.translateExprSlice(args, nil), ", "), call, strings.Join(c.translateExprSlice(s.Call.Args, nil), ", "))
			return
		}
		sig := c.p.info.Types[s.Call.Fun].Type.Underlying().(*types.Signature)
		args := c.translateArgs(sig, s.Call.Args, s.Call.Ellipsis.IsValid())
		if len(c.blocking) != 0 {
			args = append(args, "true")
		}
		c.Printf("$deferred.push([%s, [%s]]);", c.translateExpr(s.Call.Fun), strings.Join(args, ", "))

	case *ast.AssignStmt:
		c.printLabel(label)
		if s.Tok != token.ASSIGN && s.Tok != token.DEFINE {
			var op token.Token
			switch s.Tok {
			case token.ADD_ASSIGN:
				op = token.ADD
			case token.SUB_ASSIGN:
				op = token.SUB
			case token.MUL_ASSIGN:
				op = token.MUL
			case token.QUO_ASSIGN:
				op = token.QUO
			case token.REM_ASSIGN:
				op = token.REM
			case token.AND_ASSIGN:
				op = token.AND
			case token.OR_ASSIGN:
				op = token.OR
			case token.XOR_ASSIGN:
				op = token.XOR
			case token.SHL_ASSIGN:
				op = token.SHL
			case token.SHR_ASSIGN:
				op = token.SHR
			case token.AND_NOT_ASSIGN:
				op = token.AND_NOT
			default:
				panic(s.Tok)
			}

			var parts []string
			lhs := s.Lhs[0]
			switch l := lhs.(type) {
			case *ast.IndexExpr:
				lhsVar := c.newVariable("_lhs")
				indexVar := c.newVariable("_index")
				parts = append(parts, lhsVar+" = "+c.translateExpr(l.X).String()+";")
				parts = append(parts, indexVar+" = "+c.translateExpr(l.Index).String()+";")
				lhs = c.setType(&ast.IndexExpr{
					X:     c.newIdent(lhsVar, c.p.info.Types[l.X].Type),
					Index: c.newIdent(indexVar, c.p.info.Types[l.Index].Type),
				}, c.p.info.Types[l].Type)
			case *ast.StarExpr:
				lhsVar := c.newVariable("_lhs")
				parts = append(parts, lhsVar+" = "+c.translateExpr(l.X).String()+";")
				lhs = c.setType(&ast.StarExpr{
					X: c.newIdent(lhsVar, c.p.info.Types[l.X].Type),
				}, c.p.info.Types[l].Type)
			case *ast.SelectorExpr:
				v := hasCallVisitor{c.p.info, false}
				ast.Walk(&v, l.X)
				if v.hasCall {
					lhsVar := c.newVariable("_lhs")
					parts = append(parts, lhsVar+" = "+c.translateExpr(l.X).String()+";")
					lhs = c.setType(&ast.SelectorExpr{
						X:   c.newIdent(lhsVar, c.p.info.Types[l.X].Type),
						Sel: l.Sel,
					}, c.p.info.Types[l].Type)
					c.p.info.Selections[lhs.(*ast.SelectorExpr)] = c.p.info.Selections[l]
				}
			}

			lhsType := c.p.info.Types[s.Lhs[0]].Type
			parts = append(parts, c.translateAssign(lhs, c.translateExpr(c.setType(&ast.BinaryExpr{
				X:  lhs,
				Op: op,
				Y:  c.setType(&ast.ParenExpr{X: s.Rhs[0]}, c.p.info.Types[s.Rhs[0]].Type),
			}, lhsType)).String(), lhsType, s.Tok == token.DEFINE))
			c.Printf("%s", strings.Join(parts, " "))
			return
		}

		if s.Tok == token.DEFINE {
			for _, lhs := range s.Lhs {
				if !isBlank(lhs) {
					obj := c.p.info.Defs[lhs.(*ast.Ident)]
					if obj == nil {
						obj = c.p.info.Uses[lhs.(*ast.Ident)]
					}
					c.setType(lhs, obj.Type())
				}
			}
		}

		switch {
		case len(s.Lhs) == 1 && len(s.Rhs) == 1:
			lhs := removeParens(s.Lhs[0])
			if isBlank(lhs) {
				v := hasCallVisitor{c.p.info, false}
				ast.Walk(&v, s.Rhs[0])
				if v.hasCall {
					c.Printf("%s;", c.translateExpr(s.Rhs[0]).String())
				}
				return
			}
			lhsType := c.p.info.Types[s.Lhs[0]].Type
			c.Printf("%s", c.translateAssignOfExpr(lhs, s.Rhs[0], lhsType, s.Tok == token.DEFINE))

		case len(s.Lhs) > 1 && len(s.Rhs) == 1:
			tupleVar := c.newVariable("_tuple")
			out := tupleVar + " = " + c.translateExpr(s.Rhs[0]).String() + ";"
			tuple := c.p.info.Types[s.Rhs[0]].Type.(*types.Tuple)
			for i, lhs := range s.Lhs {
				lhs = removeParens(lhs)
				if !isBlank(lhs) {
					lhsType := c.p.info.Types[s.Lhs[i]].Type
					out += " " + c.translateAssignOfExpr(lhs, c.newIdent(fmt.Sprintf("%s[%d]", tupleVar, i), tuple.At(i).Type()), lhsType, s.Tok == token.DEFINE)
				}
			}
			c.Printf("%s", out)
		case len(s.Lhs) == len(s.Rhs):
			tmpVars := make([]string, len(s.Rhs))
			var parts []string
			for i, rhs := range s.Rhs {
				tmpVars[i] = c.newVariable("_tmp")
				if isBlank(removeParens(s.Lhs[i])) {
					v := hasCallVisitor{c.p.info, false}
					ast.Walk(&v, rhs)
					if v.hasCall {
						c.Printf("%s;", c.translateExpr(rhs).String())
					}
					continue
				}
				lhsType := c.p.info.Types[s.Lhs[i]].Type
				parts = append(parts, c.translateAssignOfExpr(c.newIdent(tmpVars[i], c.p.info.Types[s.Lhs[i]].Type), rhs, lhsType, true))
			}
			for i, lhs := range s.Lhs {
				lhs = removeParens(lhs)
				if !isBlank(lhs) {
					parts = append(parts, c.translateAssign(lhs, tmpVars[i], c.p.info.Types[lhs].Type, s.Tok == token.DEFINE))
				}
			}
			c.Printf("%s", strings.Join(parts, " "))

		default:
			panic("Invalid arity of AssignStmt.")

		}

	case *ast.IncDecStmt:
		t := c.p.info.Types[s.X].Type
		if iExpr, isIExpr := s.X.(*ast.IndexExpr); isIExpr {
			switch u := c.p.info.Types[iExpr.X].Type.Underlying().(type) {
			case *types.Array:
				t = u.Elem()
			case *types.Slice:
				t = u.Elem()
			case *types.Map:
				t = u.Elem()
			}
		}

		tok := token.ADD_ASSIGN
		if s.Tok == token.DEC {
			tok = token.SUB_ASSIGN
		}
		c.translateStmt(&ast.AssignStmt{
			Lhs: []ast.Expr{s.X},
			Tok: tok,
			Rhs: []ast.Expr{c.newInt(1, t)},
		}, label)

	case *ast.DeclStmt:
		c.printLabel(label)
		decl := s.Decl.(*ast.GenDecl)
		switch decl.Tok {
		case token.VAR:
			for _, spec := range s.Decl.(*ast.GenDecl).Specs {
				valueSpec := spec.(*ast.ValueSpec)
				lhs := make([]ast.Expr, len(valueSpec.Names))
				for i, name := range valueSpec.Names {
					lhs[i] = name
				}
				rhs := valueSpec.Values
				isTuple := false
				if len(rhs) == 1 {
					_, isTuple = c.p.info.Types[rhs[0]].Type.(*types.Tuple)
				}
				for len(rhs) < len(lhs) && !isTuple {
					rhs = append(rhs, nil)
				}
				c.translateStmt(&ast.AssignStmt{
					Lhs: lhs,
					Tok: token.DEFINE,
					Rhs: rhs,
				}, "")
			}
		case token.TYPE:
			for _, spec := range decl.Specs {
				o := c.p.info.Defs[spec.(*ast.TypeSpec).Name].(*types.TypeName)
				c.translateType(o, false)
				c.initType(o)
			}
		case token.CONST:
			// skip, constants are inlined
		}

	case *ast.ExprStmt:
		c.printLabel(label)
		expr := c.translateExpr(s.X)
		if expr != nil {
			c.Printf("%s;", expr)
		}

	case *ast.LabeledStmt:
		c.printLabel(label)
		c.translateStmt(s.Stmt, s.Label.Name)

	case *ast.GoStmt:
		c.printLabel(label)
		c.Printf("$go(%s, [%s]);", c.translateExpr(s.Call.Fun), strings.Join(c.translateArgs(c.p.info.Types[s.Call.Fun].Type.Underlying().(*types.Signature), s.Call.Args, s.Call.Ellipsis.IsValid()), ", "))

	case *ast.SendStmt:
		chanType := c.p.info.Types[s.Chan].Type.Underlying().(*types.Chan)
		call := &ast.CallExpr{
			Fun:  c.newIdent("$send", types.NewSignature(nil, nil, types.NewTuple(types.NewVar(0, nil, "", chanType), types.NewVar(0, nil, "", chanType.Elem())), nil, false)),
			Args: []ast.Expr{s.Chan, s.Value},
		}
		c.blocking[call] = true
		c.translateStmt(&ast.ExprStmt{call}, label)

	case *ast.SelectStmt:
		var channels []string
		var caseClauses []ast.Stmt
		flattened := false
		hasDefault := false
		for i, s := range s.Body.List {
			clause := s.(*ast.CommClause)
			switch comm := clause.Comm.(type) {
			case nil:
				channels = append(channels, "[]")
				hasDefault = true
			case *ast.ExprStmt:
				channels = append(channels, c.formatExpr("[%e]", removeParens(comm.X).(*ast.UnaryExpr).X).String())
			case *ast.AssignStmt:
				channels = append(channels, c.formatExpr("[%e]", removeParens(comm.Rhs[0]).(*ast.UnaryExpr).X).String())
			case *ast.SendStmt:
				channels = append(channels, c.formatExpr("[%e, %e]", comm.Chan, comm.Value).String())
			default:
				panic(fmt.Sprintf("unhandled: %T", comm))
			}
			caseClauses = append(caseClauses, &ast.CaseClause{
				List: []ast.Expr{c.newInt(i, types.Typ[types.Int])},
				Body: clause.Body,
			})
			flattened = flattened || c.flattened[clause]
		}

		selectCall := c.setType(&ast.CallExpr{
			Fun:  c.newIdent("$select", types.NewSignature(nil, nil, types.NewTuple(types.NewVar(0, nil, "", types.NewInterface(nil, nil))), types.NewTuple(types.NewVar(0, nil, "", types.Typ[types.Int])), false)),
			Args: []ast.Expr{c.newIdent(fmt.Sprintf("[%s]", strings.Join(channels, ", ")), types.NewInterface(nil, nil))},
		}, types.Typ[types.Int])
		c.blocking[selectCall] = !hasDefault
		selectionVar := c.newVariable("_selection")
		c.Printf("%s = %s;", selectionVar, c.translateExpr(selectCall))

		translateCond := func(cond ast.Expr) *expression {
			return c.formatExpr("%s[0] === %e", selectionVar, cond)
		}
		printCaseBodyPrefix := func(index int) {
			if assign, ok := s.Body.List[index].(*ast.CommClause).Comm.(*ast.AssignStmt); ok {
				switch rhsType := c.p.info.Types[assign.Rhs[0]].Type.(type) {
				case *types.Tuple:
					c.translateStmt(&ast.AssignStmt{Lhs: assign.Lhs, Rhs: []ast.Expr{c.newIdent(selectionVar+"[1]", rhsType)}, Tok: assign.Tok}, "")
				default:
					c.translateStmt(&ast.AssignStmt{Lhs: assign.Lhs, Rhs: []ast.Expr{c.newIdent(selectionVar+"[1][0]", rhsType)}, Tok: assign.Tok}, "")
				}
			}
		}
		c.translateBranchingStmt(caseClauses, true, translateCond, printCaseBodyPrefix, label, flattened)

	case *ast.EmptyStmt:
		// skip

	default:
		panic(fmt.Sprintf("Unhandled statement: %T\n", s))

	}
}
Esempio n. 7
0
func (c *funcContext) translateBuiltin(name string, args []ast.Expr, ellipsis bool, typ types.Type) *expression {
	switch name {
	case "new":
		t := typ.(*types.Pointer)
		if c.p.pkg.Path() == "syscall" && types.Identical(t.Elem().Underlying(), types.Typ[types.Uintptr]) {
			return c.formatExpr("new Uint8Array(8)")
		}
		switch t.Elem().Underlying().(type) {
		case *types.Struct, *types.Array:
			return c.formatExpr("%s", c.zeroValue(t.Elem()))
		default:
			return c.formatExpr("$newDataPointer(%s, %s)", c.zeroValue(t.Elem()), c.typeName(t))
		}
	case "make":
		switch argType := c.p.info.Types[args[0]].Type.Underlying().(type) {
		case *types.Slice:
			t := c.typeName(c.p.info.Types[args[0]].Type)
			if len(args) == 3 {
				return c.formatExpr("%s.make(%f, %f)", t, args[1], args[2])
			}
			return c.formatExpr("%s.make(%f)", t, args[1])
		case *types.Map:
			return c.formatExpr("new $Map()")
		case *types.Chan:
			length := "0"
			if len(args) == 2 {
				length = c.translateExpr(args[1]).String()
			}
			return c.formatExpr("new %s(%s)", c.typeName(c.p.info.Types[args[0]].Type), length)
		default:
			panic(fmt.Sprintf("Unhandled make type: %T\n", argType))
		}
	case "len":
		switch argType := c.p.info.Types[args[0]].Type.Underlying().(type) {
		case *types.Basic:
			return c.formatExpr("%e.length", args[0])
		case *types.Slice:
			return c.formatExpr("%e.$length", args[0])
		case *types.Pointer:
			return c.formatExpr("(%e, %d)", args[0], argType.Elem().(*types.Array).Len())
		case *types.Map:
			return c.formatExpr("$keys(%e).length", args[0])
		case *types.Chan:
			return c.formatExpr("%e.$buffer.length", args[0])
		// length of array is constant
		default:
			panic(fmt.Sprintf("Unhandled len type: %T\n", argType))
		}
	case "cap":
		switch argType := c.p.info.Types[args[0]].Type.Underlying().(type) {
		case *types.Slice:
			return c.formatExpr("%e.$capacity", args[0])
		case *types.Pointer:
			return c.formatExpr("(%e, %d)", args[0], argType.Elem().(*types.Array).Len())
		case *types.Chan:
			return c.formatExpr("%e.$capacity", args[0])
		// capacity of array is constant
		default:
			panic(fmt.Sprintf("Unhandled cap type: %T\n", argType))
		}
	case "panic":
		return c.formatExpr("$panic(%s)", c.translateImplicitConversion(args[0], types.NewInterface(nil, nil)))
	case "append":
		if len(args) == 1 {
			return c.translateExpr(args[0])
		}
		if ellipsis {
			return c.formatExpr("$appendSlice(%e, %s)", args[0], c.translateConversionToSlice(args[1], typ))
		}
		sliceType := typ.Underlying().(*types.Slice)
		return c.formatExpr("$append(%e, %s)", args[0], strings.Join(c.translateExprSlice(args[1:], sliceType.Elem()), ", "))
	case "delete":
		return c.formatExpr(`delete %e[%s]`, args[0], c.makeKey(args[1], c.p.info.Types[args[0]].Type.Underlying().(*types.Map).Key()))
	case "copy":
		if basic, isBasic := c.p.info.Types[args[1]].Type.Underlying().(*types.Basic); isBasic && basic.Info()&types.IsString != 0 {
			return c.formatExpr("$copyString(%e, %e)", args[0], args[1])
		}
		return c.formatExpr("$copySlice(%e, %e)", args[0], args[1])
	case "print", "println":
		return c.formatExpr("console.log(%s)", strings.Join(c.translateExprSlice(args, nil), ", "))
	case "complex":
		return c.formatExpr("new %s(%e, %e)", c.typeName(typ), args[0], args[1])
	case "real":
		return c.formatExpr("%e.$real", args[0])
	case "imag":
		return c.formatExpr("%e.$imag", args[0])
	case "recover":
		return c.formatExpr("$recover()")
	case "close":
		return c.formatExpr(`$close(%e)`, args[0])
	default:
		panic(fmt.Sprintf("Unhandled builtin: %s\n", name))
	}
}
Esempio n. 8
0
func (c *funcContext) translateExpr(expr ast.Expr) *expression {
	exprType := c.p.info.Types[expr].Type
	if value := c.p.info.Types[expr].Value; value != nil {
		basic := types.Typ[types.String]
		if value.Kind() != exact.String { // workaround for bug in go/types
			basic = exprType.Underlying().(*types.Basic)
		}
		switch {
		case basic.Info()&types.IsBoolean != 0:
			return c.formatExpr("%s", strconv.FormatBool(exact.BoolVal(value)))
		case basic.Info()&types.IsInteger != 0:
			if is64Bit(basic) {
				d, _ := exact.Uint64Val(value)
				if basic.Kind() == types.Int64 {
					return c.formatExpr("new %s(%s, %s)", c.typeName(exprType), strconv.FormatInt(int64(d)>>32, 10), strconv.FormatUint(d&(1<<32-1), 10))
				}
				return c.formatExpr("new %s(%s, %s)", c.typeName(exprType), strconv.FormatUint(d>>32, 10), strconv.FormatUint(d&(1<<32-1), 10))
			}
			d, _ := exact.Int64Val(value)
			return c.formatExpr("%s", strconv.FormatInt(d, 10))
		case basic.Info()&types.IsFloat != 0:
			f, _ := exact.Float64Val(value)
			return c.formatExpr("%s", strconv.FormatFloat(f, 'g', -1, 64))
		case basic.Info()&types.IsComplex != 0:
			r, _ := exact.Float64Val(exact.Real(value))
			i, _ := exact.Float64Val(exact.Imag(value))
			if basic.Kind() == types.UntypedComplex {
				exprType = types.Typ[types.Complex128]
			}
			return c.formatExpr("new %s(%s, %s)", c.typeName(exprType), strconv.FormatFloat(r, 'g', -1, 64), strconv.FormatFloat(i, 'g', -1, 64))
		case basic.Info()&types.IsString != 0:
			return c.formatExpr("%s", encodeString(exact.StringVal(value)))
		default:
			panic("Unhandled constant type: " + basic.String())
		}
	}

	switch e := expr.(type) {
	case *ast.CompositeLit:
		if ptrType, isPointer := exprType.(*types.Pointer); isPointer {
			exprType = ptrType.Elem()
		}

		collectIndexedElements := func(elementType types.Type) []string {
			elements := make([]string, 0)
			i := 0
			zero := c.zeroValue(elementType)
			for _, element := range e.Elts {
				if kve, isKve := element.(*ast.KeyValueExpr); isKve {
					key, _ := exact.Int64Val(c.p.info.Types[kve.Key].Value)
					i = int(key)
					element = kve.Value
				}
				for len(elements) <= i {
					elements = append(elements, zero)
				}
				elements[i] = c.translateImplicitConversionWithCloning(element, elementType).String()
				i++
			}
			return elements
		}

		switch t := exprType.Underlying().(type) {
		case *types.Array:
			elements := collectIndexedElements(t.Elem())
			if len(elements) == 0 {
				return c.formatExpr("%s", c.zeroValue(t))
			}
			zero := c.zeroValue(t.Elem())
			for len(elements) < int(t.Len()) {
				elements = append(elements, zero)
			}
			return c.formatExpr(`$toNativeArray("%s", [%s])`, typeKind(t.Elem()), strings.Join(elements, ", "))
		case *types.Slice:
			return c.formatExpr("new %s([%s])", c.typeName(exprType), strings.Join(collectIndexedElements(t.Elem()), ", "))
		case *types.Map:
			mapVar := c.newVariable("_map")
			keyVar := c.newVariable("_key")
			assignments := ""
			for _, element := range e.Elts {
				kve := element.(*ast.KeyValueExpr)
				assignments += c.formatExpr(`%s = %s, %s[%s] = { k: %s, v: %s }, `, keyVar, c.translateImplicitConversion(kve.Key, t.Key()), mapVar, c.makeKey(c.newIdent(keyVar, t.Key()), t.Key()), keyVar, c.translateImplicitConversion(kve.Value, t.Elem())).String()
			}
			return c.formatExpr("(%s = new $Map(), %s%s)", mapVar, assignments, mapVar)
		case *types.Struct:
			elements := make([]string, t.NumFields())
			isKeyValue := true
			if len(e.Elts) != 0 {
				_, isKeyValue = e.Elts[0].(*ast.KeyValueExpr)
			}
			if !isKeyValue {
				for i, element := range e.Elts {
					elements[i] = c.translateImplicitConversion(element, t.Field(i).Type()).String()
				}
			}
			if isKeyValue {
				for i := range elements {
					elements[i] = c.zeroValue(t.Field(i).Type())
				}
				for _, element := range e.Elts {
					kve := element.(*ast.KeyValueExpr)
					for j := range elements {
						if kve.Key.(*ast.Ident).Name == t.Field(j).Name() {
							elements[j] = c.translateImplicitConversion(kve.Value, t.Field(j).Type()).String()
							break
						}
					}
				}
			}
			return c.formatExpr("new %s.Ptr(%s)", c.typeName(exprType), strings.Join(elements, ", "))
		default:
			panic(fmt.Sprintf("Unhandled CompositeLit type: %T\n", t))
		}

	case *ast.FuncLit:
		innerContext := c.p.analyzeFunction(exprType.(*types.Signature), e.Body)
		params, body := innerContext.translateFunction(e.Type, e.Body.List, c.allVars)
		if len(c.p.escapingVars) != 0 {
			names := make([]string, 0, len(c.p.escapingVars))
			for obj := range c.p.escapingVars {
				names = append(names, c.p.objectVars[obj])
			}
			list := strings.Join(names, ", ")
			return c.formatExpr("(function(%s) { return function(%s) {\n%s%s}; })(%s)", list, strings.Join(params, ", "), string(body), strings.Repeat("\t", c.p.indentation), list)
		}
		return c.formatExpr("(function(%s) {\n%s%s})", strings.Join(params, ", "), string(body), strings.Repeat("\t", c.p.indentation))

	case *ast.UnaryExpr:
		t := c.p.info.Types[e.X].Type
		switch e.Op {
		case token.AND:
			switch t.Underlying().(type) {
			case *types.Struct, *types.Array:
				return c.translateExpr(e.X)
			}

			switch x := removeParens(e.X).(type) {
			case *ast.CompositeLit:
				return c.formatExpr("$newDataPointer(%e, %s)", x, c.typeName(c.p.info.Types[e].Type))
			case *ast.Ident:
				if obj := c.p.info.Uses[x]; c.p.escapingVars[obj] {
					return c.formatExpr("new %s(function() { return this.$target[0]; }, function($v) { this.$target[0] = $v; }, %s)", c.typeName(exprType), c.p.objectVars[obj])
				}
				return c.formatExpr("new %s(function() { return %e; }, function($v) { %s })", c.typeName(exprType), x, c.translateAssign(x, "$v", exprType, false))
			case *ast.SelectorExpr:
				newSel := &ast.SelectorExpr{X: c.newIdent("this.$target", c.p.info.Types[x.X].Type), Sel: x.Sel}
				c.p.info.Selections[newSel] = c.p.info.Selections[x]
				return c.formatExpr("new %s(function() { return %e; }, function($v) { %s }, %e)", c.typeName(exprType), newSel, c.translateAssign(newSel, "$v", exprType, false), x.X)
			case *ast.IndexExpr:
				newIndex := &ast.IndexExpr{X: c.newIdent("this.$target", c.p.info.Types[x.X].Type), Index: x.Index}
				return c.formatExpr("new %s(function() { return %e; }, function($v) { %s }, %e)", c.typeName(exprType), newIndex, c.translateAssign(newIndex, "$v", exprType, false), x.X)
			default:
				panic(fmt.Sprintf("Unhandled: %T\n", x))
			}

		case token.ARROW:
			call := &ast.CallExpr{
				Fun:  c.newIdent("$recv", types.NewSignature(nil, nil, types.NewTuple(types.NewVar(0, nil, "", t)), types.NewTuple(types.NewVar(0, nil, "", exprType), types.NewVar(0, nil, "", types.Typ[types.Bool])), false)),
				Args: []ast.Expr{e.X},
			}
			c.blocking[call] = true
			if _, isTuple := exprType.(*types.Tuple); isTuple {
				return c.formatExpr("%e", call)
			}
			return c.formatExpr("%e[0]", call)
		}

		basic := t.Underlying().(*types.Basic)
		switch e.Op {
		case token.ADD:
			return c.translateExpr(e.X)
		case token.SUB:
			switch {
			case is64Bit(basic):
				return c.formatExpr("new %1s(-%2h, -%2l)", c.typeName(t), e.X)
			case basic.Info()&types.IsComplex != 0:
				return c.formatExpr("new %1s(-%2r, -%2i)", c.typeName(t), e.X)
			case basic.Info()&types.IsUnsigned != 0:
				return c.fixNumber(c.formatExpr("-%e", e.X), basic)
			default:
				return c.formatExpr("-%e", e.X)
			}
		case token.XOR:
			if is64Bit(basic) {
				return c.formatExpr("new %1s(~%2h, ~%2l >>> 0)", c.typeName(t), e.X)
			}
			return c.fixNumber(c.formatExpr("~%e", e.X), basic)
		case token.NOT:
			x := c.translateExpr(e.X)
			if x.String() == "true" {
				return c.formatExpr("false")
			}
			if x.String() == "false" {
				return c.formatExpr("true")
			}
			return c.formatExpr("!%s", x)
		default:
			panic(e.Op)
		}

	case *ast.BinaryExpr:
		if e.Op == token.NEQ {
			return c.formatExpr("!(%s)", c.translateExpr(&ast.BinaryExpr{
				X:  e.X,
				Op: token.EQL,
				Y:  e.Y,
			}))
		}

		t := c.p.info.Types[e.X].Type
		t2 := c.p.info.Types[e.Y].Type
		_, isInterface := t2.Underlying().(*types.Interface)
		if isInterface {
			t = t2
		}

		if basic, isBasic := t.Underlying().(*types.Basic); isBasic && basic.Info()&types.IsNumeric != 0 {
			if is64Bit(basic) {
				switch e.Op {
				case token.MUL:
					return c.formatExpr("$mul64(%e, %e)", e.X, e.Y)
				case token.QUO:
					return c.formatExpr("$div64(%e, %e, false)", e.X, e.Y)
				case token.REM:
					return c.formatExpr("$div64(%e, %e, true)", e.X, e.Y)
				case token.SHL:
					return c.formatExpr("$shiftLeft64(%e, %f)", e.X, e.Y)
				case token.SHR:
					return c.formatExpr("$shiftRight%s(%e, %f)", toJavaScriptType(basic), e.X, e.Y)
				case token.EQL:
					return c.formatExpr("(%1h === %2h && %1l === %2l)", e.X, e.Y)
				case token.LSS:
					return c.formatExpr("(%1h < %2h || (%1h === %2h && %1l < %2l))", e.X, e.Y)
				case token.LEQ:
					return c.formatExpr("(%1h < %2h || (%1h === %2h && %1l <= %2l))", e.X, e.Y)
				case token.GTR:
					return c.formatExpr("(%1h > %2h || (%1h === %2h && %1l > %2l))", e.X, e.Y)
				case token.GEQ:
					return c.formatExpr("(%1h > %2h || (%1h === %2h && %1l >= %2l))", e.X, e.Y)
				case token.ADD, token.SUB:
					return c.formatExpr("new %3s(%1h %4t %2h, %1l %4t %2l)", e.X, e.Y, c.typeName(t), e.Op)
				case token.AND, token.OR, token.XOR:
					return c.formatExpr("new %3s(%1h %4t %2h, (%1l %4t %2l) >>> 0)", e.X, e.Y, c.typeName(t), e.Op)
				case token.AND_NOT:
					return c.formatExpr("new %3s(%1h &~ %2h, (%1l &~ %2l) >>> 0)", e.X, e.Y, c.typeName(t))
				default:
					panic(e.Op)
				}
			}

			if basic.Info()&types.IsComplex != 0 {
				switch e.Op {
				case token.EQL:
					if basic.Kind() == types.Complex64 {
						return c.formatExpr("($float32IsEqual(%1r, %2r) && $float32IsEqual(%1i, %2i))", e.X, e.Y)
					}
					return c.formatExpr("(%1r === %2r && %1i === %2i)", e.X, e.Y)
				case token.ADD, token.SUB:
					return c.formatExpr("new %3s(%1r %4t %2r, %1i %4t %2i)", e.X, e.Y, c.typeName(t), e.Op)
				case token.MUL:
					return c.formatExpr("new %3s(%1r * %2r - %1i * %2i, %1r * %2i + %1i * %2r)", e.X, e.Y, c.typeName(t))
				case token.QUO:
					return c.formatExpr("$divComplex(%e, %e)", e.X, e.Y)
				default:
					panic(e.Op)
				}
			}

			switch e.Op {
			case token.EQL:
				if basic.Kind() == types.Float32 {
					return c.formatParenExpr("$float32IsEqual(%e, %e)", e.X, e.Y)
				}
				return c.formatParenExpr("%e === %e", e.X, e.Y)
			case token.LSS, token.LEQ, token.GTR, token.GEQ:
				return c.formatExpr("%e %t %e", e.X, e.Op, e.Y)
			case token.ADD, token.SUB:
				if basic.Info()&types.IsInteger != 0 {
					return c.fixNumber(c.formatExpr("%e %t %e", e.X, e.Op, e.Y), basic)
				}
				return c.formatExpr("%e %t %e", e.X, e.Op, e.Y)
			case token.MUL:
				switch basic.Kind() {
				case types.Int32, types.Int:
					return c.formatParenExpr("(((%1e >>> 16 << 16) * %2e >> 0) + (%1e << 16 >>> 16) * %2e) >> 0", e.X, e.Y)
				case types.Uint32, types.Uint, types.Uintptr:
					return c.formatParenExpr("(((%1e >>> 16 << 16) * %2e >>> 0) + (%1e << 16 >>> 16) * %2e) >>> 0", e.X, e.Y)
				case types.Float32, types.Float64:
					return c.formatExpr("%e * %e", e.X, e.Y)
				default:
					return c.fixNumber(c.formatExpr("%e * %e", e.X, e.Y), basic)
				}
			case token.QUO:
				if basic.Info()&types.IsInteger != 0 {
					// cut off decimals
					shift := ">>"
					if basic.Info()&types.IsUnsigned != 0 {
						shift = ">>>"
					}
					return c.formatExpr(`(%1s = %2e / %3e, (%1s === %1s && %1s !== 1/0 && %1s !== -1/0) ? %1s %4s 0 : $throwRuntimeError("integer divide by zero"))`, c.newVariable("_q"), e.X, e.Y, shift)
				}
				return c.formatExpr("%e / %e", e.X, e.Y)
			case token.REM:
				return c.formatExpr(`(%1s = %2e %% %3e, %1s === %1s ? %1s : $throwRuntimeError("integer divide by zero"))`, c.newVariable("_r"), e.X, e.Y)
			case token.SHL, token.SHR:
				op := e.Op.String()
				if e.Op == token.SHR && basic.Info()&types.IsUnsigned != 0 {
					op = ">>>"
				}
				if c.p.info.Types[e.Y].Value != nil {
					return c.fixNumber(c.formatExpr("%e %s %e", e.X, op, e.Y), basic)
				}
				if e.Op == token.SHR && basic.Info()&types.IsUnsigned == 0 {
					return c.fixNumber(c.formatParenExpr("%e >> $min(%e, 31)", e.X, e.Y), basic)
				}
				y := c.newVariable("y")
				return c.fixNumber(c.formatExpr("(%s = %s, %s < 32 ? (%e %s %s) : 0)", y, c.translateImplicitConversion(e.Y, types.Typ[types.Uint]), y, e.X, op, y), basic)
			case token.AND, token.OR:
				if basic.Info()&types.IsUnsigned != 0 {
					return c.formatParenExpr("(%e %t %e) >>> 0", e.X, e.Op, e.Y)
				}
				return c.formatParenExpr("%e %t %e", e.X, e.Op, e.Y)
			case token.AND_NOT:
				return c.formatParenExpr("%e & ~%e", e.X, e.Y)
			case token.XOR:
				return c.fixNumber(c.formatParenExpr("%e ^ %e", e.X, e.Y), basic)
			default:
				panic(e.Op)
			}
		}

		switch e.Op {
		case token.ADD, token.LSS, token.LEQ, token.GTR, token.GEQ:
			return c.formatExpr("%e %t %e", e.X, e.Op, e.Y)
		case token.LAND:
			x := c.translateExpr(e.X)
			y := c.translateExpr(e.Y)
			if x.String() == "false" {
				return c.formatExpr("false")
			}
			return c.formatExpr("%s && %s", x, y)
		case token.LOR:
			x := c.translateExpr(e.X)
			y := c.translateExpr(e.Y)
			if x.String() == "true" {
				return c.formatExpr("true")
			}
			return c.formatExpr("%s || %s", x, y)
		case token.EQL:
			switch u := t.Underlying().(type) {
			case *types.Array, *types.Struct:
				return c.formatExpr("$equal(%e, %e, %s)", e.X, e.Y, c.typeName(t))
			case *types.Interface:
				if isJsObject(t) {
					return c.formatExpr("%s === %s", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t))
				}
				return c.formatExpr("$interfaceIsEqual(%s, %s)", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t))
			case *types.Pointer:
				xUnary, xIsUnary := e.X.(*ast.UnaryExpr)
				yUnary, yIsUnary := e.Y.(*ast.UnaryExpr)
				if xIsUnary && xUnary.Op == token.AND && yIsUnary && yUnary.Op == token.AND {
					xIndex, xIsIndex := xUnary.X.(*ast.IndexExpr)
					yIndex, yIsIndex := yUnary.X.(*ast.IndexExpr)
					if xIsIndex && yIsIndex {
						return c.formatExpr("$sliceIsEqual(%e, %f, %e, %f)", xIndex.X, xIndex.Index, yIndex.X, yIndex.Index)
					}
				}
				switch u.Elem().Underlying().(type) {
				case *types.Struct, *types.Interface:
					return c.formatExpr("%s === %s", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t))
				case *types.Array:
					return c.formatExpr("$equal(%s, %s, %s)", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t), c.typeName(u.Elem()))
				default:
					return c.formatExpr("$pointerIsEqual(%s, %s)", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t))
				}
			default:
				return c.formatExpr("%s === %s", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t))
			}
		default:
			panic(e.Op)
		}

	case *ast.ParenExpr:
		x := c.translateExpr(e.X)
		if x.String() == "true" || x.String() == "false" {
			return x
		}
		return c.formatParenExpr("%s", x)

	case *ast.IndexExpr:
		switch t := c.p.info.Types[e.X].Type.Underlying().(type) {
		case *types.Array, *types.Pointer:
			if c.p.info.Types[e.Index].Value != nil {
				return c.formatExpr("%e[%f]", e.X, e.Index)
			}
			return c.formatExpr(`((%2f < 0 || %2f >= %1e.length) ? $throwRuntimeError("index out of range") : %1e[%2f])`, e.X, e.Index)
		case *types.Slice:
			return c.formatExpr(`((%2f < 0 || %2f >= %1e.$length) ? $throwRuntimeError("index out of range") : %1e.$array[%1e.$offset + %2f])`, e.X, e.Index)
		case *types.Map:
			key := c.makeKey(e.Index, t.Key())
			if _, isTuple := exprType.(*types.Tuple); isTuple {
				return c.formatExpr(`(%1s = %2e[%3s], %1s !== undefined ? [%1s.v, true] : [%4s, false])`, c.newVariable("_entry"), e.X, key, c.zeroValue(t.Elem()))
			}
			return c.formatExpr(`(%1s = %2e[%3s], %1s !== undefined ? %1s.v : %4s)`, c.newVariable("_entry"), e.X, key, c.zeroValue(t.Elem()))
		case *types.Basic:
			return c.formatExpr("%e.charCodeAt(%f)", e.X, e.Index)
		default:
			panic(fmt.Sprintf("Unhandled IndexExpr: %T\n", t))
		}

	case *ast.SliceExpr:
		if b, isBasic := c.p.info.Types[e.X].Type.Underlying().(*types.Basic); isBasic && b.Info()&types.IsString != 0 {
			switch {
			case e.Low == nil && e.High == nil:
				return c.translateExpr(e.X)
			case e.Low == nil:
				return c.formatExpr("%e.substring(0, %f)", e.X, e.High)
			case e.High == nil:
				return c.formatExpr("%e.substring(%f)", e.X, e.Low)
			default:
				return c.formatExpr("%e.substring(%f, %f)", e.X, e.Low, e.High)
			}
		}
		slice := c.translateConversionToSlice(e.X, exprType)
		switch {
		case e.Low == nil && e.High == nil:
			return c.formatExpr("%s", slice)
		case e.Low == nil:
			if e.Max != nil {
				return c.formatExpr("$subslice(%s, 0, %f, %f)", slice, e.High, e.Max)
			}
			return c.formatExpr("$subslice(%s, 0, %f)", slice, e.High)
		case e.High == nil:
			return c.formatExpr("$subslice(%s, %f)", slice, e.Low)
		default:
			if e.Max != nil {
				return c.formatExpr("$subslice(%s, %f, %f, %f)", slice, e.Low, e.High, e.Max)
			}
			return c.formatExpr("$subslice(%s, %f, %f)", slice, e.Low, e.High)
		}

	case *ast.SelectorExpr:
		sel, ok := c.p.info.Selections[e]
		if !ok {
			// qualified identifier
			obj := c.p.info.Uses[e.Sel]
			if isJsPackage(obj.Pkg()) {
				switch obj.Name() {
				case "Global":
					return c.formatExpr("$global")
				case "This":
					if len(c.flattened) != 0 {
						return c.formatExpr("$this")
					}
					return c.formatExpr("this")
				case "Arguments":
					args := "arguments"
					if len(c.flattened) != 0 {
						args = "$args"
					}
					return c.formatExpr(`new ($sliceType(%s.Object))($global.Array.prototype.slice.call(%s, []))`, c.p.pkgVars["github.com/gopherjs/gopherjs/js"], args)
				case "Module":
					return c.formatExpr("$module")
				default:
					panic("Invalid js package object: " + obj.Name())
				}
			}
			return c.formatExpr("%s", c.objectName(obj))
		}

		parameterName := func(v *types.Var) string {
			if v.Anonymous() || v.Name() == "" {
				return c.newVariable("param")
			}
			return c.newVariable(v.Name())
		}
		makeParametersList := func() []string {
			params := sel.Obj().Type().(*types.Signature).Params()
			names := make([]string, params.Len())
			for i := 0; i < params.Len(); i++ {
				names[i] = parameterName(params.At(i))
			}
			return names
		}

		switch sel.Kind() {
		case types.FieldVal:
			fields, jsTag := c.translateSelection(sel)
			if jsTag != "" {
				if _, ok := sel.Type().(*types.Signature); ok {
					return c.formatExpr("$internalize(%1e.%2s.%3s, %4s, %1e.%2s)", e.X, strings.Join(fields, "."), jsTag, c.typeName(sel.Type()))
				}
				return c.internalize(c.formatExpr("%e.%s.%s", e.X, strings.Join(fields, "."), jsTag), sel.Type())
			}
			return c.formatExpr("%e.%s", e.X, strings.Join(fields, "."))
		case types.MethodVal:
			if !sel.Obj().Exported() {
				c.p.dependencies[sel.Obj()] = true
			}
			parameters := makeParametersList()
			target := c.translateExpr(e.X)
			if isWrapped(sel.Recv()) {
				target = c.formatParenExpr("new %s(%s)", c.typeName(sel.Recv()), target)
			}
			recv := c.newVariable("_recv")
			return c.formatExpr("(%s = %s, function(%s) { $stackDepthOffset--; try { return %s.%s(%s); } finally { $stackDepthOffset++; } })", recv, target, strings.Join(parameters, ", "), recv, e.Sel.Name, strings.Join(parameters, ", "))
		case types.MethodExpr:
			if !sel.Obj().Exported() {
				c.p.dependencies[sel.Obj()] = true
			}
			recv := "recv"
			if isWrapped(sel.Recv()) {
				recv = fmt.Sprintf("(new %s(recv))", c.typeName(sel.Recv()))
			}
			parameters := makeParametersList()
			return c.formatExpr("(function(%s) { $stackDepthOffset--; try { return %s.%s(%s); } finally { $stackDepthOffset++; } })", strings.Join(append([]string{"recv"}, parameters...), ", "), recv, sel.Obj().(*types.Func).Name(), strings.Join(parameters, ", "))
		}
		panic("")

	case *ast.CallExpr:
		plainFun := e.Fun
		for {
			if p, isParen := plainFun.(*ast.ParenExpr); isParen {
				plainFun = p.X
				continue
			}
			break
		}

		var isType func(ast.Expr) bool
		isType = func(expr ast.Expr) bool {
			switch e := expr.(type) {
			case *ast.ArrayType, *ast.ChanType, *ast.FuncType, *ast.InterfaceType, *ast.MapType, *ast.StructType:
				return true
			case *ast.StarExpr:
				return isType(e.X)
			case *ast.Ident:
				_, ok := c.p.info.Uses[e].(*types.TypeName)
				return ok
			case *ast.SelectorExpr:
				_, ok := c.p.info.Uses[e.Sel].(*types.TypeName)
				return ok
			case *ast.ParenExpr:
				return isType(e.X)
			default:
				return false
			}
		}

		if isType(plainFun) {
			return c.formatExpr("%s", c.translateConversion(e.Args[0], c.p.info.Types[plainFun].Type))
		}

		var fun *expression
		switch f := plainFun.(type) {
		case *ast.Ident:
			if o, ok := c.p.info.Uses[f].(*types.Builtin); ok {
				return c.translateBuiltin(o.Name(), e.Args, e.Ellipsis.IsValid(), exprType)
			}
			fun = c.translateExpr(plainFun)

		case *ast.SelectorExpr:
			sel, ok := c.p.info.Selections[f]
			if !ok {
				// qualified identifier
				obj := c.p.info.Uses[f.Sel]
				if isJsPackage(obj.Pkg()) {
					switch obj.Name() {
					case "InternalObject":
						return c.translateExpr(e.Args[0])
					}
				}
				fun = c.translateExpr(f)
				break
			}

			externalizeExpr := func(e ast.Expr) string {
				t := c.p.info.Types[e].Type
				if types.Identical(t, types.Typ[types.UntypedNil]) {
					return "null"
				}
				return c.externalize(c.translateExpr(e).String(), t)
			}
			externalizeArgs := func(args []ast.Expr) string {
				s := make([]string, len(args))
				for i, arg := range args {
					s[i] = externalizeExpr(arg)
				}
				return strings.Join(s, ", ")
			}

			switch sel.Kind() {
			case types.MethodVal:
				if !sel.Obj().Exported() {
					c.p.dependencies[sel.Obj()] = true
				}

				methodName := sel.Obj().Name()
				if reservedKeywords[methodName] {
					methodName += "$"
				}

				recvType := sel.Recv()
				_, isPointer := recvType.Underlying().(*types.Pointer)
				methodsRecvType := sel.Obj().Type().(*types.Signature).Recv().Type()
				_, pointerExpected := methodsRecvType.(*types.Pointer)
				var recv *expression
				switch {
				case !isPointer && pointerExpected:
					recv = c.translateExpr(c.setType(&ast.UnaryExpr{Op: token.AND, X: f.X}, methodsRecvType))
				default:
					recv = c.translateExpr(f.X)
				}

				for _, index := range sel.Index()[:len(sel.Index())-1] {
					if ptr, isPtr := recvType.(*types.Pointer); isPtr {
						recvType = ptr.Elem()
					}
					s := recvType.Underlying().(*types.Struct)
					recv = c.formatExpr("%s.%s", recv, fieldName(s, index))
					recvType = s.Field(index).Type()
				}

				if isJsPackage(sel.Obj().Pkg()) {
					globalRef := func(id string) string {
						if recv.String() == "$global" && id[0] == '$' {
							return id
						}
						return recv.String() + "." + id
					}
					switch sel.Obj().Name() {
					case "Get":
						if id, ok := c.identifierConstant(e.Args[0]); ok {
							return c.formatExpr("%s", globalRef(id))
						}
						return c.formatExpr("%s[$externalize(%e, $String)]", recv, e.Args[0])
					case "Set":
						if id, ok := c.identifierConstant(e.Args[0]); ok {
							return c.formatExpr("%s = %s", globalRef(id), externalizeExpr(e.Args[1]))
						}
						return c.formatExpr("%s[$externalize(%e, $String)] = %s", recv, e.Args[0], externalizeExpr(e.Args[1]))
					case "Delete":
						return c.formatExpr("delete %s[$externalize(%e, $String)]", recv, e.Args[0])
					case "Length":
						return c.formatExpr("$parseInt(%s.length)", recv)
					case "Index":
						return c.formatExpr("%s[%e]", recv, e.Args[0])
					case "SetIndex":
						return c.formatExpr("%s[%e] = %s", recv, e.Args[0], externalizeExpr(e.Args[1]))
					case "Call":
						if id, ok := c.identifierConstant(e.Args[0]); ok {
							if e.Ellipsis.IsValid() {
								objVar := c.newVariable("obj")
								return c.formatExpr("(%s = %s, %s.%s.apply(%s, %s))", objVar, recv, objVar, id, objVar, externalizeExpr(e.Args[1]))
							}
							return c.formatExpr("%s(%s)", globalRef(id), externalizeArgs(e.Args[1:]))
						}
						if e.Ellipsis.IsValid() {
							objVar := c.newVariable("obj")
							return c.formatExpr("(%s = %s, %s[$externalize(%e, $String)].apply(%s, %s))", objVar, recv, objVar, e.Args[0], objVar, externalizeExpr(e.Args[1]))
						}
						return c.formatExpr("%s[$externalize(%e, $String)](%s)", recv, e.Args[0], externalizeArgs(e.Args[1:]))
					case "Invoke":
						if e.Ellipsis.IsValid() {
							return c.formatExpr("%s.apply(undefined, %s)", recv, externalizeExpr(e.Args[0]))
						}
						return c.formatExpr("%s(%s)", recv, externalizeArgs(e.Args))
					case "New":
						if e.Ellipsis.IsValid() {
							return c.formatExpr("new ($global.Function.prototype.bind.apply(%s, [undefined].concat(%s)))", recv, externalizeExpr(e.Args[0]))
						}
						return c.formatExpr("new (%s)(%s)", recv, externalizeArgs(e.Args))
					case "Bool":
						return c.internalize(recv, types.Typ[types.Bool])
					case "Str":
						return c.internalize(recv, types.Typ[types.String])
					case "Int":
						return c.internalize(recv, types.Typ[types.Int])
					case "Int64":
						return c.internalize(recv, types.Typ[types.Int64])
					case "Uint64":
						return c.internalize(recv, types.Typ[types.Uint64])
					case "Float":
						return c.internalize(recv, types.Typ[types.Float64])
					case "Interface":
						return c.internalize(recv, types.NewInterface(nil, nil))
					case "Unsafe":
						return recv
					case "IsUndefined":
						return c.formatParenExpr("%s === undefined", recv)
					case "IsNull":
						return c.formatParenExpr("%s === null", recv)
					default:
						panic("Invalid js package object: " + sel.Obj().Name())
					}
				}

				if isWrapped(methodsRecvType) {
					fun = c.formatExpr("(new %s(%s)).%s", c.typeName(methodsRecvType), recv, methodName)
					break
				}
				fun = c.formatExpr("%s.%s", recv, methodName)

			case types.FieldVal:
				fields, jsTag := c.translateSelection(sel)
				if jsTag != "" {
					sig := sel.Type().(*types.Signature)
					return c.internalize(c.formatExpr("%e.%s.%s(%s)", f.X, strings.Join(fields, "."), jsTag, externalizeArgs(e.Args)), sig.Results().At(0).Type())
				}
				fun = c.formatExpr("%e.%s", f.X, strings.Join(fields, "."))

			case types.MethodExpr:
				fun = c.translateExpr(f)

			default:
				panic("")
			}
		default:
			fun = c.translateExpr(plainFun)
		}

		sig := c.p.info.Types[plainFun].Type.Underlying().(*types.Signature)
		if len(e.Args) == 1 {
			if tuple, isTuple := c.p.info.Types[e.Args[0]].Type.(*types.Tuple); isTuple {
				tupleVar := c.newVariable("_tuple")
				args := make([]ast.Expr, tuple.Len())
				for i := range args {
					args[i] = c.newIdent(c.formatExpr("%s[%d]", tupleVar, i).String(), tuple.At(i).Type())
				}
				return c.formatExpr("(%s = %e, %s(%s))", tupleVar, e.Args[0], fun, strings.Join(c.translateArgs(sig, args, false), ", "))
			}
		}
		args := c.translateArgs(sig, e.Args, e.Ellipsis.IsValid())
		if c.blocking[e] {
			resumeCase := c.caseCounter
			c.caseCounter++
			returnVar := "$r"
			if sig.Results().Len() != 0 {
				returnVar = c.newVariable("_r")
			}
			c.Printf("%[1]s = %[2]s(%[3]s); /* */ $s = %[4]d; case %[4]d: if (%[1]s && %[1]s.constructor === Function) { %[1]s = %[1]s(); }", returnVar, fun, strings.Join(append(args, "true"), ", "), resumeCase)
			if sig.Results().Len() != 0 {
				return c.formatExpr("%s", returnVar)
			}
			return nil
		}
		return c.formatExpr("%s(%s)", fun, strings.Join(args, ", "))

	case *ast.StarExpr:
		if c1, isCall := e.X.(*ast.CallExpr); isCall && len(c1.Args) == 1 {
			if c2, isCall := c1.Args[0].(*ast.CallExpr); isCall && len(c2.Args) == 1 && types.Identical(c.p.info.Types[c2.Fun].Type, types.Typ[types.UnsafePointer]) {
				if unary, isUnary := c2.Args[0].(*ast.UnaryExpr); isUnary && unary.Op == token.AND {
					return c.translateExpr(unary.X) // unsafe conversion
				}
			}
		}
		switch exprType.Underlying().(type) {
		case *types.Struct, *types.Array:
			return c.translateExpr(e.X)
		}
		return c.formatExpr("%e.$get()", e.X)

	case *ast.TypeAssertExpr:
		if e.Type == nil {
			return c.translateExpr(e.X)
		}
		t := c.p.info.Types[e.Type].Type
		check := "%1e !== null && " + c.typeCheck("%1e.constructor", t)
		valueSuffix := ""
		if _, isInterface := t.Underlying().(*types.Interface); !isInterface {
			valueSuffix = ".$val"
		}
		if _, isTuple := exprType.(*types.Tuple); isTuple {
			return c.formatExpr("("+check+" ? [%1e%2s, true] : [%3s, false])", e.X, valueSuffix, c.zeroValue(c.p.info.Types[e.Type].Type))
		}
		return c.formatExpr("("+check+" ? %1e%2s : $typeAssertionFailed(%1e, %3s))", e.X, valueSuffix, c.typeName(t))

	case *ast.Ident:
		if e.Name == "_" {
			panic("Tried to translate underscore identifier.")
		}
		obj := c.p.info.Defs[e]
		if obj == nil {
			obj = c.p.info.Uses[e]
		}
		switch o := obj.(type) {
		case *types.PkgName:
			return c.formatExpr("%s", c.p.pkgVars[o.Pkg().Path()])
		case *types.Var, *types.Const:
			return c.formatExpr("%s", c.objectName(o))
		case *types.Func:
			return c.formatExpr("%s", c.objectName(o))
		case *types.TypeName:
			return c.formatExpr("%s", c.typeName(o.Type()))
		case *types.Nil:
			return c.formatExpr("%s", c.zeroValue(c.p.info.Types[e].Type))
		default:
			panic(fmt.Sprintf("Unhandled object: %T\n", o))
		}

	case *This:
		this := "this"
		if len(c.flattened) != 0 {
			this = "$this"
		}
		if isWrapped(c.p.info.Types[e].Type) {
			this += ".$val"
		}
		return c.formatExpr(this)

	case nil:
		return c.formatExpr("")

	default:
		panic(fmt.Sprintf("Unhandled expression: %T\n", e))

	}
}
Esempio n. 9
0
// TODO(adonovan): move the constraint definitions and the store() etc
// functions which add them (and are also used by the solver) into a
// new file, constraints.go.

import (
	"fmt"
	"go/token"

	"code.google.com/p/go.tools/go/callgraph"
	"code.google.com/p/go.tools/go/ssa"
	"code.google.com/p/go.tools/go/types"
)

var (
	tEface     = types.NewInterface(nil, nil).Complete()
	tInvalid   = types.Typ[types.Invalid]
	tUnsafePtr = types.Typ[types.UnsafePointer]
)

// ---------- Node creation ----------

// nextNode returns the index of the next unused node.
func (a *analysis) nextNode() nodeid {
	return nodeid(len(a.nodes))
}

// addNodes creates nodes for all scalar elements in type typ, and
// returns the id of the first one, or zero if the type was
// analytically uninteresting.
//
Esempio n. 10
0
func (c *PkgContext) translateExpr(expr ast.Expr) string {
	exprType := c.info.Types[expr]
	if value, valueFound := c.info.Values[expr]; valueFound {
		basic := types.Typ[types.String]
		if value.Kind() != exact.String { // workaround for bug in go/types
			basic = exprType.Underlying().(*types.Basic)
		}
		switch {
		case basic.Info()&types.IsBoolean != 0:
			return strconv.FormatBool(exact.BoolVal(value))
		case basic.Info()&types.IsInteger != 0:
			if is64Bit(basic) {
				d, _ := exact.Uint64Val(value)
				return fmt.Sprintf("new %s(%d, %d)", c.typeName(exprType), d>>32, d&(1<<32-1))
			}
			d, _ := exact.Int64Val(value)
			return strconv.FormatInt(d, 10)
		case basic.Info()&types.IsFloat != 0:
			f, _ := exact.Float64Val(value)
			return strconv.FormatFloat(f, 'g', -1, 64)
		case basic.Info()&types.IsComplex != 0:
			r, _ := exact.Float64Val(exact.Real(value))
			i, _ := exact.Float64Val(exact.Imag(value))
			if basic.Kind() == types.UntypedComplex {
				exprType = types.Typ[types.Complex128]
			}
			return fmt.Sprintf("new %s(%s, %s)", c.typeName(exprType), strconv.FormatFloat(r, 'g', -1, 64), strconv.FormatFloat(i, 'g', -1, 64))
		case basic.Info()&types.IsString != 0:
			buffer := bytes.NewBuffer(nil)
			for _, r := range []byte(exact.StringVal(value)) {
				switch r {
				case '\b':
					buffer.WriteString(`\b`)
				case '\f':
					buffer.WriteString(`\f`)
				case '\n':
					buffer.WriteString(`\n`)
				case '\r':
					buffer.WriteString(`\r`)
				case '\t':
					buffer.WriteString(`\t`)
				case '\v':
					buffer.WriteString(`\v`)
				case '"':
					buffer.WriteString(`\"`)
				case '\\':
					buffer.WriteString(`\\`)
				default:
					if r < 0x20 || r > 0x7E {
						fmt.Fprintf(buffer, `\x%02X`, r)
						continue
					}
					buffer.WriteByte(r)
				}
			}
			return `"` + buffer.String() + `"`
		default:
			panic("Unhandled constant type: " + basic.String())
		}
	}

	switch e := expr.(type) {
	case *ast.CompositeLit:
		if ptrType, isPointer := exprType.(*types.Pointer); isPointer {
			exprType = ptrType.Elem()
		}

		collectIndexedElements := func(elementType types.Type) []string {
			elements := make([]string, 0)
			i := 0
			zero := c.zeroValue(elementType)
			for _, element := range e.Elts {
				if kve, isKve := element.(*ast.KeyValueExpr); isKve {
					key, _ := exact.Int64Val(c.info.Values[kve.Key])
					i = int(key)
					element = kve.Value
				}
				for len(elements) <= i {
					elements = append(elements, zero)
				}
				elements[i] = c.translateExprToType(element, elementType)
				i++
			}
			return elements
		}

		switch t := exprType.Underlying().(type) {
		case *types.Array:
			elements := collectIndexedElements(t.Elem())
			if len(elements) != 0 {
				zero := c.zeroValue(t.Elem())
				for len(elements) < int(t.Len()) {
					elements = append(elements, zero)
				}
				return createListComposite(t.Elem(), elements)
			}
			return fmt.Sprintf("Go$makeArray(%s, %d, function() { return %s; })", toArrayType(t.Elem()), t.Len(), c.zeroValue(t.Elem()))
		case *types.Slice:
			return fmt.Sprintf("new %s(%s)", c.typeName(exprType), createListComposite(t.Elem(), collectIndexedElements(t.Elem())))
		case *types.Map:
			elements := make([]string, len(e.Elts)*2)
			for i, element := range e.Elts {
				kve := element.(*ast.KeyValueExpr)
				elements[i*2] = c.translateExprToType(kve.Key, t.Key())
				elements[i*2+1] = c.translateExprToType(kve.Value, t.Elem())
			}
			return fmt.Sprintf("new %s([%s])", c.typeName(exprType), strings.Join(elements, ", "))
		case *types.Struct:
			elements := make([]string, t.NumFields())
			isKeyValue := true
			if len(e.Elts) != 0 {
				_, isKeyValue = e.Elts[0].(*ast.KeyValueExpr)
			}
			if !isKeyValue {
				for i, element := range e.Elts {
					elements[i] = c.translateExprToType(element, t.Field(i).Type())
				}
			}
			if isKeyValue {
				for i := range elements {
					elements[i] = c.zeroValue(t.Field(i).Type())
				}
				for _, element := range e.Elts {
					kve := element.(*ast.KeyValueExpr)
					for j := range elements {
						if kve.Key.(*ast.Ident).Name == t.Field(j).Name() {
							elements[j] = c.translateExprToType(kve.Value, t.Field(j).Type())
							break
						}
					}
				}
			}
			if named, isNamed := exprType.(*types.Named); isNamed {
				return fmt.Sprintf("new %s(%s)", c.objectName(named.Obj()), strings.Join(elements, ", "))
			}
			structVar := c.newVariable("_struct")
			c.translateTypeSpec(&ast.TypeSpec{
				Name: c.newIdent(structVar, t),
				Type: e.Type,
			})
			return fmt.Sprintf("new %s(%s)", structVar, strings.Join(elements, ", "))
		default:
			panic(fmt.Sprintf("Unhandled CompositeLit type: %T\n", t))
		}

	case *ast.FuncLit:
		return strings.TrimSpace(string(c.CatchOutput(func() {
			c.newScope(func() {
				params := c.translateParams(e.Type)
				closurePrefix := "("
				closureSuffix := ")"
				if len(c.escapingVars) != 0 {
					list := strings.Join(c.escapingVars, ", ")
					closurePrefix = "(function(" + list + ") { return "
					closureSuffix = "; })(" + list + ")"
				}
				c.Printf("%sfunction(%s) {", closurePrefix, strings.Join(params, ", "))
				c.Indent(func() {
					c.translateFunctionBody(e.Body.List, exprType.(*types.Signature))
				})
				c.Printf("}%s", closureSuffix)
			})
		})))

	case *ast.UnaryExpr:
		switch e.Op {
		case token.AND:
			switch c.info.Types[e.X].Underlying().(type) {
			case *types.Struct, *types.Array:
				return c.translateExpr(e.X)
			default:
				if _, isComposite := e.X.(*ast.CompositeLit); isComposite {
					return fmt.Sprintf("Go$newDataPointer(%s, %s)", c.translateExpr(e.X), c.typeName(c.info.Types[e]))
				}
				closurePrefix := ""
				closureSuffix := ""
				if len(c.escapingVars) != 0 {
					list := strings.Join(c.escapingVars, ", ")
					closurePrefix = "(function(" + list + ") { return "
					closureSuffix = "; })(" + list + ")"
				}
				vVar := c.newVariable("v")
				return fmt.Sprintf("%snew %s(function() { return %s; }, function(%s) { %s; })%s", closurePrefix, c.typeName(exprType), c.translateExpr(e.X), vVar, c.translateAssign(e.X, vVar), closureSuffix)
			}
		case token.ARROW:
			return "undefined"
		}

		t := c.info.Types[e.X]
		basic := t.Underlying().(*types.Basic)
		op := e.Op.String()
		switch e.Op {
		case token.ADD:
			return c.translateExpr(e.X)
		case token.SUB:
			if is64Bit(basic) {
				x := c.newVariable("x")
				return fmt.Sprintf("(%s = %s, new %s(-%s.high, -%s.low))", x, c.translateExpr(e.X), c.typeName(t), x, x)
			}
			if basic.Info()&types.IsComplex != 0 {
				x := c.newVariable("x")
				return fmt.Sprintf("(%s = %s, new %s(-%s.real, -%s.imag))", x, c.translateExpr(e.X), c.typeName(t), x, x)
			}
		case token.XOR:
			if is64Bit(basic) {
				x := c.newVariable("x")
				return fmt.Sprintf("(%s = %s, new %s(~%s.high, ~%s.low >>> 0))", x, c.translateExpr(e.X), c.typeName(t), x, x)
			}
			op = "~"
		}
		return fixNumber(fmt.Sprintf("%s%s", op, c.translateExpr(e.X)), basic)

	case *ast.BinaryExpr:
		if e.Op == token.NEQ {
			return fmt.Sprintf("!(%s)", c.translateExpr(&ast.BinaryExpr{
				X:  e.X,
				Op: token.EQL,
				Y:  e.Y,
			}))
		}

		t := c.info.Types[e.X]
		t2 := c.info.Types[e.Y]
		_, isInterface := t2.Underlying().(*types.Interface)
		if isInterface {
			t = t2
		}

		if basic, isBasic := t.Underlying().(*types.Basic); isBasic && basic.Info()&types.IsNumeric != 0 {
			if is64Bit(basic) {
				var expr string
				switch e.Op {
				case token.MUL:
					return fmt.Sprintf("Go$mul64(%s, %s)", c.translateExpr(e.X), c.translateExpr(e.Y))
				case token.QUO:
					return fmt.Sprintf("Go$div64(%s, %s, false)", c.translateExpr(e.X), c.translateExpr(e.Y))
				case token.REM:
					return fmt.Sprintf("Go$div64(%s, %s, true)", c.translateExpr(e.X), c.translateExpr(e.Y))
				case token.SHL:
					return fmt.Sprintf("Go$shiftLeft64(%s, %s)", c.translateExpr(e.X), c.flatten64(e.Y))
				case token.SHR:
					return fmt.Sprintf("Go$shiftRight%s(%s, %s)", toJavaScriptType(basic), c.translateExpr(e.X), c.flatten64(e.Y))
				case token.EQL:
					expr = "x.high === y.high && x.low === y.low"
				case token.LSS:
					expr = "x.high < y.high || (x.high === y.high && x.low < y.low)"
				case token.LEQ:
					expr = "x.high < y.high || (x.high === y.high && x.low <= y.low)"
				case token.GTR:
					expr = "x.high > y.high || (x.high === y.high && x.low > y.low)"
				case token.GEQ:
					expr = "x.high > y.high || (x.high === y.high && x.low >= y.low)"
				case token.ADD, token.SUB:
					expr = fmt.Sprintf("new %s(x.high %s y.high, x.low %s y.low)", c.typeName(t), e.Op, e.Op)
				case token.AND, token.OR, token.XOR:
					expr = fmt.Sprintf("new %s(x.high %s y.high, (x.low %s y.low) >>> 0)", c.typeName(t), e.Op, e.Op)
				case token.AND_NOT:
					expr = fmt.Sprintf("new %s(x.high &~ y.high, (x.low &~ y.low) >>> 0)", c.typeName(t))
				default:
					panic(e.Op)
				}
				x := c.newVariable("x")
				y := c.newVariable("y")
				expr = strings.Replace(expr, "x.", x+".", -1)
				expr = strings.Replace(expr, "y.", y+".", -1)
				return fmt.Sprintf("(%s = %s, %s = %s, %s)", x, c.translateExpr(e.X), y, c.translateExpr(e.Y), expr)
			}

			if basic.Info()&types.IsComplex != 0 {
				var expr string
				switch e.Op {
				case token.EQL:
					expr = "x.real === y.real && x.imag === y.imag"
				case token.ADD, token.SUB:
					expr = fmt.Sprintf("new %s(x.real %s y.real, x.imag %s y.imag)", c.typeName(t), e.Op, e.Op)
				case token.MUL:
					expr = fmt.Sprintf("new %s(x.real * y.real - x.imag * y.imag, x.real * y.imag + x.imag * y.real)", c.typeName(t))
				case token.QUO:
					return fmt.Sprintf("Go$divComplex(%s, %s)", c.translateExpr(e.X), c.translateExpr(e.Y))
				default:
					panic(e.Op)
				}
				x := c.newVariable("x")
				y := c.newVariable("y")
				expr = strings.Replace(expr, "x.", x+".", -1)
				expr = strings.Replace(expr, "y.", y+".", -1)
				return fmt.Sprintf("(%s = %s, %s = %s, %s)", x, c.translateExpr(e.X), y, c.translateExpr(e.Y), expr)
			}

			switch e.Op {
			case token.EQL:
				return fmt.Sprintf("%s === %s", c.translateExpr(e.X), c.translateExpr(e.Y))
			case token.LSS, token.LEQ, token.GTR, token.GEQ:
				return fmt.Sprintf("%s %s %s", c.translateExpr(e.X), e.Op, c.translateExpr(e.Y))
			case token.ADD, token.SUB:
				return fixNumber(fmt.Sprintf("%s %s %s", c.translateExpr(e.X), e.Op, c.translateExpr(e.Y)), basic)
			case token.MUL:
				if basic.Kind() == types.Int32 {
					x := c.newVariable("x")
					y := c.newVariable("y")
					return fmt.Sprintf("(%s = %s, %s = %s, (((%s >>> 16 << 16) * %s >> 0) + (%s << 16 >>> 16) * %s) >> 0)", x, c.translateExpr(e.X), y, c.translateExpr(e.Y), x, y, x, y)
				}
				if basic.Kind() == types.Uint32 || basic.Kind() == types.Uintptr {
					x := c.newVariable("x")
					y := c.newVariable("y")
					return fmt.Sprintf("(%s = %s, %s = %s, (((%s >>> 16 << 16) * %s >>> 0) + (%s << 16 >>> 16) * %s) >>> 0)", x, c.translateExpr(e.X), y, c.translateExpr(e.Y), x, y, x, y)
				}
				return fixNumber(fmt.Sprintf("%s * %s", c.translateExpr(e.X), c.translateExpr(e.Y)), basic)
			case token.QUO:
				value := fmt.Sprintf("%s / %s", c.translateExpr(e.X), c.translateExpr(e.Y))
				if basic.Info()&types.IsInteger != 0 {
					value = "(Go$obj = " + value + `, (Go$obj === Go$obj && Go$obj !== 1/0 && Go$obj !== -1/0) ? Go$obj : Go$throwRuntimeError("integer divide by zero"))`
				}
				switch basic.Kind() {
				case types.Int, types.Uint:
					return "(" + value + " >> 0)" // cut off decimals
				default:
					return fixNumber(value, basic)
				}
			case token.REM:
				return fmt.Sprintf(`(Go$obj = %s %% %s, Go$obj === Go$obj ? Go$obj : Go$throwRuntimeError("integer divide by zero"))`, c.translateExpr(e.X), c.translateExpr(e.Y))
			case token.SHL, token.SHR:
				op := e.Op.String()
				if e.Op == token.SHR && basic.Info()&types.IsUnsigned != 0 {
					op = ">>>"
				}
				if c.info.Values[e.Y] != nil {
					return fixNumber(fmt.Sprintf("%s %s %s", c.translateExpr(e.X), op, c.translateExpr(e.Y)), basic)
				}
				if e.Op == token.SHR && basic.Info()&types.IsUnsigned == 0 {
					return fixNumber(fmt.Sprintf("(%s >> Go$min(%s, 31))", c.translateExpr(e.X), c.translateExpr(e.Y)), basic)
				}
				y := c.newVariable("y")
				return fixNumber(fmt.Sprintf("(%s = %s, %s < 32 ? (%s %s %s) : 0)", y, c.translateExprToType(e.Y, types.Typ[types.Uint]), y, c.translateExpr(e.X), op, y), basic)
			case token.AND, token.OR, token.XOR:
				return fixNumber(fmt.Sprintf("(%s %s %s)", c.translateExpr(e.X), e.Op, c.translateExpr(e.Y)), basic)
			case token.AND_NOT:
				return fixNumber(fmt.Sprintf("(%s &~ %s)", c.translateExpr(e.X), c.translateExpr(e.Y)), basic)
			default:
				panic(e.Op)
			}
		}

		switch e.Op {
		case token.ADD, token.LSS, token.LEQ, token.GTR, token.GEQ, token.LAND, token.LOR:
			return fmt.Sprintf("%s %s %s", c.translateExpr(e.X), e.Op, c.translateExpr(e.Y))
		case token.EQL:
			switch u := t.Underlying().(type) {
			case *types.Struct:
				x := c.newVariable("x")
				y := c.newVariable("y")
				var conds []string
				for i := 0; i < u.NumFields(); i++ {
					field := u.Field(i)
					if field.Name() == "_" {
						continue
					}
					conds = append(conds, c.translateExpr(&ast.BinaryExpr{
						X:  c.newIdent(x+"."+field.Name(), field.Type()),
						Op: token.EQL,
						Y:  c.newIdent(y+"."+field.Name(), field.Type()),
					}))
				}
				if len(conds) == 0 {
					conds = []string{"true"}
				}
				return fmt.Sprintf("(%s = %s, %s = %s, %s)", x, c.translateExpr(e.X), y, c.translateExpr(e.Y), strings.Join(conds, " && "))
			case *types.Interface:
				return fmt.Sprintf("Go$interfaceIsEqual(%s, %s)", c.translateExprToType(e.X, t), c.translateExprToType(e.Y, t))
			case *types.Array:
				return fmt.Sprintf("Go$arrayIsEqual(%s, %s)", c.translateExpr(e.X), c.translateExpr(e.Y))
			case *types.Pointer:
				xUnary, xIsUnary := e.X.(*ast.UnaryExpr)
				yUnary, yIsUnary := e.Y.(*ast.UnaryExpr)
				if xIsUnary && xUnary.Op == token.AND && yIsUnary && yUnary.Op == token.AND {
					xIndex, xIsIndex := xUnary.X.(*ast.IndexExpr)
					yIndex, yIsIndex := yUnary.X.(*ast.IndexExpr)
					if xIsIndex && yIsIndex {
						return fmt.Sprintf("Go$sliceIsEqual(%s, %s, %s, %s)", c.translateExpr(xIndex.X), c.flatten64(xIndex.Index), c.translateExpr(yIndex.X), c.flatten64(yIndex.Index))
					}
				}
				switch u.Elem().Underlying().(type) {
				case *types.Struct, *types.Interface:
					return c.translateExprToType(e.X, t) + " === " + c.translateExprToType(e.Y, t)
				case *types.Array:
					return fmt.Sprintf("Go$arrayIsEqual(%s, %s)", c.translateExprToType(e.X, t), c.translateExprToType(e.Y, t))
				default:
					return fmt.Sprintf("Go$pointerIsEqual(%s, %s)", c.translateExprToType(e.X, t), c.translateExprToType(e.Y, t))
				}
			default:
				return c.translateExprToType(e.X, t) + " === " + c.translateExprToType(e.Y, t)
			}
		default:
			panic(e.Op)
		}

	case *ast.ParenExpr:
		return fmt.Sprintf("(%s)", c.translateExpr(e.X))

	case *ast.IndexExpr:
		xType := c.info.Types[e.X]
		if ptr, isPointer := xType.(*types.Pointer); isPointer {
			xType = ptr.Elem()
		}
		switch t := xType.Underlying().(type) {
		case *types.Array:
			return fmt.Sprintf("%s[%s]", c.translateExpr(e.X), c.flatten64(e.Index))
		case *types.Slice:
			sliceVar := c.newVariable("_slice")
			indexVar := c.newVariable("_index")
			return fmt.Sprintf(`(%s = %s, %s = %s, (%s >= 0 && %s < %s.length) ? %s.array[%s.offset + %s] : Go$throwRuntimeError("index out of range"))`, sliceVar, c.translateExpr(e.X), indexVar, c.flatten64(e.Index), indexVar, indexVar, sliceVar, sliceVar, sliceVar, indexVar)
		case *types.Map:
			key := c.makeKey(e.Index, t.Key())
			if _, isTuple := exprType.(*types.Tuple); isTuple {
				return fmt.Sprintf(`(Go$obj = (%s || false)[%s], Go$obj !== undefined ? [Go$obj.v, true] : [%s, false])`, c.translateExpr(e.X), key, c.zeroValue(t.Elem()))
			}
			return fmt.Sprintf(`(Go$obj = (%s || false)[%s], Go$obj !== undefined ? Go$obj.v : %s)`, c.translateExpr(e.X), key, c.zeroValue(t.Elem()))
		case *types.Basic:
			return fmt.Sprintf("%s.charCodeAt(%s)", c.translateExpr(e.X), c.flatten64(e.Index))
		default:
			panic(fmt.Sprintf("Unhandled IndexExpr: %T\n", t))
		}

	case *ast.SliceExpr:
		b, isBasic := c.info.Types[e.X].(*types.Basic)
		isString := isBasic && b.Info()&types.IsString != 0
		slice := c.translateExprToType(e.X, exprType)
		if e.High == nil {
			if e.Low == nil {
				return slice
			}
			if isString {
				return fmt.Sprintf("%s.substring(%s)", slice, c.flatten64(e.Low))
			}
			return fmt.Sprintf("Go$subslice(%s, %s)", slice, c.flatten64(e.Low))
		}
		low := "0"
		if e.Low != nil {
			low = c.flatten64(e.Low)
		}
		if isString {
			return fmt.Sprintf("%s.substring(%s, %s)", slice, low, c.flatten64(e.High))
		}
		if e.Max != nil {
			return fmt.Sprintf("Go$subslice(%s, %s, %s, %s)", slice, low, c.flatten64(e.High), c.flatten64(e.Max))
		}
		return fmt.Sprintf("Go$subslice(%s, %s, %s)", slice, low, c.flatten64(e.High))

	case *ast.SelectorExpr:
		sel := c.info.Selections[e]
		parameterName := func(v *types.Var) string {
			if v.Anonymous() || v.Name() == "" {
				return c.newVariable("param")
			}
			return c.newVariable(v.Name())
		}
		makeParametersList := func() []string {
			params := sel.Obj().Type().(*types.Signature).Params()
			names := make([]string, params.Len())
			for i := 0; i < params.Len(); i++ {
				names[i] = parameterName(params.At(i))
			}
			return names
		}

		switch sel.Kind() {
		case types.FieldVal:
			return c.translateExpr(e.X) + "." + translateSelection(sel)
		case types.MethodVal:
			parameters := makeParametersList()
			recv := c.newVariable("_recv")
			return fmt.Sprintf("(%s = %s, function(%s) { return %s.%s(%s); })", recv, c.translateExpr(e.X), strings.Join(parameters, ", "), recv, e.Sel.Name, strings.Join(parameters, ", "))
		case types.MethodExpr:
			recv := "recv"
			if isWrapped(sel.Recv()) {
				recv = fmt.Sprintf("(new %s(recv))", c.typeName(sel.Recv()))
			}
			parameters := makeParametersList()
			return fmt.Sprintf("(function(%s) { return %s.%s(%s); })", strings.Join(append([]string{"recv"}, parameters...), ", "), recv, sel.Obj().(*types.Func).Name(), strings.Join(parameters, ", "))
		case types.PackageObj:
			return fmt.Sprintf("%s.%s", c.translateExpr(e.X), e.Sel.Name)
		}
		panic("")

	case *ast.CallExpr:
		plainFun := e.Fun
		for {
			if p, isParen := plainFun.(*ast.ParenExpr); isParen {
				plainFun = p.X
				continue
			}
			break
		}

		switch f := plainFun.(type) {
		case *ast.Ident:
			switch o := c.info.Objects[f].(type) {
			case *types.Builtin:
				switch o.Name() {
				case "new":
					t := c.info.Types[e].(*types.Pointer)
					if types.IsIdentical(t.Elem().Underlying(), types.Typ[types.Uintptr]) {
						return "new Uint8Array(8)"
					}
					switch t.Elem().Underlying().(type) {
					case *types.Struct, *types.Array:
						return c.zeroValue(t.Elem())
					default:
						return fmt.Sprintf("Go$newDataPointer(%s, %s)", c.zeroValue(t.Elem()), c.typeName(t))
					}
				case "make":
					switch t2 := c.info.Types[e.Args[0]].Underlying().(type) {
					case *types.Slice:
						if len(e.Args) == 3 {
							return fmt.Sprintf("Go$subslice(new %s(Go$makeArray(%s, %s, function() { return %s; })), 0, %s)", c.typeName(c.info.Types[e.Args[0]]), toArrayType(t2.Elem()), c.translateExprToType(e.Args[2], types.Typ[types.Int]), c.zeroValue(t2.Elem()), c.translateExprToType(e.Args[1], types.Typ[types.Int]))
						}
						return fmt.Sprintf("new %s(Go$makeArray(%s, %s, function() { return %s; }))", c.typeName(c.info.Types[e.Args[0]]), toArrayType(t2.Elem()), c.translateExprToType(e.Args[1], types.Typ[types.Int]), c.zeroValue(t2.Elem()))
					default:
						args := []string{"undefined"}
						for _, arg := range e.Args[1:] {
							args = append(args, c.translateExpr(arg))
						}
						return fmt.Sprintf("new %s(%s)", c.typeName(c.info.Types[e.Args[0]]), strings.Join(args, ", "))
					}
				case "len":
					arg := c.translateExpr(e.Args[0])
					switch argType := c.info.Types[e.Args[0]].Underlying().(type) {
					case *types.Basic, *types.Slice:
						return arg + ".length"
					case *types.Pointer:
						return fmt.Sprintf("(%s, %d)", arg, argType.Elem().(*types.Array).Len())
					case *types.Map:
						return fmt.Sprintf("(Go$obj = %s, Go$obj !== null ? Go$keys(Go$obj).length : 0)", arg)
					case *types.Chan:
						return "0"
					// length of array is constant
					default:
						panic(fmt.Sprintf("Unhandled len type: %T\n", argType))
					}
				case "cap":
					arg := c.translateExpr(e.Args[0])
					switch argType := c.info.Types[e.Args[0]].Underlying().(type) {
					case *types.Slice:
						return arg + ".capacity"
					case *types.Pointer:
						return fmt.Sprintf("(%s, %d)", arg, argType.Elem().(*types.Array).Len())
					case *types.Chan:
						return "0"
					// capacity of array is constant
					default:
						panic(fmt.Sprintf("Unhandled cap type: %T\n", argType))
					}
				case "panic":
					return fmt.Sprintf("throw new Go$Panic(%s)", c.translateExprToType(e.Args[0], types.NewInterface(nil, nil)))
				case "append":
					if e.Ellipsis.IsValid() {
						return fmt.Sprintf("Go$append(%s, %s)", c.translateExpr(e.Args[0]), c.translateExprToType(e.Args[1], exprType))
					}
					sliceType := exprType.Underlying().(*types.Slice)
					toAppend := createListComposite(sliceType.Elem(), c.translateExprSlice(e.Args[1:], sliceType.Elem()))
					return fmt.Sprintf("Go$append(%s, new %s(%s))", c.translateExpr(e.Args[0]), c.typeName(exprType), toAppend)
				case "delete":
					return fmt.Sprintf(`delete (%s || Go$Map.Go$nil)[%s]`, c.translateExpr(e.Args[0]), c.makeKey(e.Args[1], c.info.Types[e.Args[0]].Underlying().(*types.Map).Key()))
				case "copy":
					return fmt.Sprintf("Go$copy(%s, %s)", c.translateExprToType(e.Args[0], types.NewSlice(types.Typ[types.Byte])), c.translateExprToType(e.Args[1], types.NewSlice(types.Typ[types.Byte])))
				case "print", "println":
					return fmt.Sprintf("console.log(%s)", strings.Join(c.translateExprSlice(e.Args, nil), ", "))
				case "complex":
					return fmt.Sprintf("new %s(%s, %s)", c.typeName(c.info.Types[e]), c.translateExpr(e.Args[0]), c.translateExpr(e.Args[1]))
				case "real":
					return c.translateExpr(e.Args[0]) + ".real"
				case "imag":
					return c.translateExpr(e.Args[0]) + ".imag"
				case "recover":
					return "Go$recover()"
				case "close":
					return `Go$throwRuntimeError("not supported by GopherJS: close")`
				default:
					panic(fmt.Sprintf("Unhandled builtin: %s\n", o.Name()))
				}
			case *types.TypeName: // conversion
				if basic, isBasic := o.Type().Underlying().(*types.Basic); isBasic && !types.IsIdentical(c.info.Types[e.Args[0]], types.Typ[types.UnsafePointer]) {
					return fixNumber(c.translateExprToType(e.Args[0], o.Type()), basic)
				}
				return c.translateExprToType(e.Args[0], o.Type())
			}
		case *ast.FuncType: // conversion
			return c.translateExprToType(e.Args[0], c.info.Types[plainFun])
		}

		funType := c.info.Types[plainFun]
		sig, isSig := funType.Underlying().(*types.Signature)
		if !isSig { // conversion
			if c.pkg.Path() == "reflect" {
				if call, isCall := e.Args[0].(*ast.CallExpr); isCall && types.IsIdentical(c.info.Types[call.Fun], types.Typ[types.UnsafePointer]) {
					if named, isNamed := funType.(*types.Pointer).Elem().(*types.Named); isNamed {
						return c.translateExpr(call.Args[0]) + "." + named.Obj().Name() // unsafe conversion
					}
				}
			}
			return c.translateExprToType(e.Args[0], funType)
		}

		var fun string
		switch f := plainFun.(type) {
		case *ast.SelectorExpr:
			sel := c.info.Selections[f]

			switch sel.Kind() {
			case types.MethodVal:
				methodsRecvType := sel.Obj().(*types.Func).Type().(*types.Signature).Recv().Type()
				_, pointerExpected := methodsRecvType.(*types.Pointer)
				_, isPointer := sel.Recv().Underlying().(*types.Pointer)
				_, isStruct := sel.Recv().Underlying().(*types.Struct)
				_, isArray := sel.Recv().Underlying().(*types.Array)
				if pointerExpected && !isPointer && !isStruct && !isArray {
					target := c.translateExpr(f.X)
					vVar := c.newVariable("v")
					fun = fmt.Sprintf("(new %s(function() { return %s; }, function(%s) { %s = %s; })).%s", c.typeName(methodsRecvType), target, vVar, target, vVar, f.Sel.Name)
					break
				}
				if isWrapped(sel.Recv()) {
					fun = fmt.Sprintf("(new %s(%s)).%s", c.typeName(sel.Recv()), c.translateExpr(f.X), f.Sel.Name)
					break
				}
				fun = fmt.Sprintf("%s.%s", c.translateExpr(f.X), f.Sel.Name)
			case types.FieldVal, types.MethodExpr, types.PackageObj:
				fun = c.translateExpr(f)
			default:
				panic("")
			}
		default:
			fun = c.translateExpr(plainFun)
		}
		if len(e.Args) == 1 {
			if tuple, isTuple := c.info.Types[e.Args[0]].(*types.Tuple); isTuple {
				args := make([]ast.Expr, tuple.Len())
				for i := range args {
					args[i] = c.newIdent(fmt.Sprintf("Go$tuple[%d]", i), tuple.At(i).Type())
				}
				return fmt.Sprintf("(Go$tuple = %s, %s(%s))", c.translateExpr(e.Args[0]), fun, c.translateArgs(sig, args, false))
			}
		}
		return fmt.Sprintf("%s(%s)", fun, c.translateArgs(sig, e.Args, e.Ellipsis.IsValid()))

	case *ast.StarExpr:
		if c1, isCall := e.X.(*ast.CallExpr); isCall && len(c1.Args) == 1 {
			if c2, isCall := c1.Args[0].(*ast.CallExpr); isCall && len(c2.Args) == 1 && types.IsIdentical(c.info.Types[c2.Fun], types.Typ[types.UnsafePointer]) {
				if unary, isUnary := c2.Args[0].(*ast.UnaryExpr); isUnary && unary.Op == token.AND {
					return c.translateExpr(unary.X) // unsafe conversion
				}
			}
		}
		switch exprType.Underlying().(type) {
		case *types.Struct, *types.Array:
			return c.translateExpr(e.X)
		}
		return c.translateExpr(e.X) + ".Go$get()"

	case *ast.TypeAssertExpr:
		if e.Type == nil {
			return c.translateExpr(e.X)
		}
		t := c.info.Types[e.Type]
		check := "Go$obj !== null && " + c.typeCheck("Go$obj.constructor", t)
		value := "Go$obj"
		if _, isInterface := t.Underlying().(*types.Interface); !isInterface {
			value += ".Go$val"
		}
		if _, isTuple := exprType.(*types.Tuple); isTuple {
			return fmt.Sprintf("(Go$obj = %s, %s ? [%s, true] : [%s, false])", c.translateExpr(e.X), check, value, c.zeroValue(c.info.Types[e.Type]))
		}
		return fmt.Sprintf("(Go$obj = %s, %s ? %s : Go$typeAssertionFailed(Go$obj))", c.translateExpr(e.X), check, value)

	case *ast.Ident:
		if e.Name == "_" {
			panic("Tried to translate underscore identifier.")
		}
		switch o := c.info.Objects[e].(type) {
		case *types.PkgName:
			return c.pkgVars[o.Pkg().Path()]
		case *types.Var, *types.Const:
			return c.objectName(o)
		case *types.Func:
			return c.objectName(o)
		case *types.TypeName:
			return c.typeName(o.Type())
		case *types.Nil:
			return c.zeroValue(c.info.Types[e])
		case nil:
			return e.Name
		default:
			panic(fmt.Sprintf("Unhandled object: %T\n", o))
		}

	case nil:
		return ""

	default:
		panic(fmt.Sprintf("Unhandled expression: %T\n", e))

	}
}
Esempio n. 11
0
func (p *importer) typ() types.Type {
	// if the type was seen before, i is its index (>= 0)
	i := p.int()
	if i >= 0 {
		return p.typList[i]
	}

	// otherwise, i is the type tag (< 0)
	switch i {
	case arrayTag:
		t := new(types.Array)
		p.record(t)

		n := p.int64()
		*t = *types.NewArray(p.typ(), n)
		return t

	case sliceTag:
		t := new(types.Slice)
		p.record(t)

		*t = *types.NewSlice(p.typ())
		return t

	case structTag:
		t := new(types.Struct)
		p.record(t)

		n := p.int()
		fields := make([]*types.Var, n)
		tags := make([]string, n)
		for i := range fields {
			fields[i] = p.field()
			tags[i] = p.string()
		}
		*t = *types.NewStruct(fields, tags)
		return t

	case pointerTag:
		t := new(types.Pointer)
		p.record(t)

		*t = *types.NewPointer(p.typ())
		return t

	case signatureTag:
		t := new(types.Signature)
		p.record(t)

		*t = *p.signature()
		return t

	case interfaceTag:
		t := new(types.Interface)
		p.record(t)

		// read embedded interfaces
		embeddeds := make([]*types.Named, p.int())
		for i := range embeddeds {
			embeddeds[i] = p.typ().(*types.Named)
		}

		// read methods
		methods := make([]*types.Func, p.int())
		for i := range methods {
			pkg, name := p.qualifiedName()
			methods[i] = types.NewFunc(token.NoPos, pkg, name, p.typ().(*types.Signature))
		}

		*t = *types.NewInterface(methods, embeddeds)
		return t

	case mapTag:
		t := new(types.Map)
		p.record(t)

		*t = *types.NewMap(p.typ(), p.typ())
		return t

	case chanTag:
		t := new(types.Chan)
		p.record(t)

		*t = *types.NewChan(types.ChanDir(p.int()), p.typ())
		return t

	case namedTag:
		// read type object
		name := p.string()
		pkg := p.pkg()
		scope := pkg.Scope()
		obj := scope.Lookup(name)

		// if the object doesn't exist yet, create and insert it
		if obj == nil {
			obj = types.NewTypeName(token.NoPos, pkg, name, nil)
			scope.Insert(obj)
		}

		// associate new named type with obj if it doesn't exist yet
		t0 := types.NewNamed(obj.(*types.TypeName), nil, nil)

		// but record the existing type, if any
		t := obj.Type().(*types.Named)
		p.record(t)

		// read underlying type
		t0.SetUnderlying(p.typ())

		// read associated methods
		for i, n := 0, p.int(); i < n; i++ {
			t0.AddMethod(types.NewFunc(token.NoPos, pkg, p.string(), p.typ().(*types.Signature)))
		}

		return t

	default:
		panic(fmt.Sprintf("unexpected type tag %d", i))
	}
}
Esempio n. 12
0
// TODO(adonovan): move the constraint definitions and the store() etc
// functions which add them (and are also used by the solver) into a
// new file, constraints.go.

import (
	"fmt"
	"go/token"

	"code.google.com/p/go.tools/go/callgraph"
	"code.google.com/p/go.tools/go/ssa"
	"code.google.com/p/go.tools/go/types"
)

var (
	tEface     = types.NewInterface(nil, nil)
	tInvalid   = types.Typ[types.Invalid]
	tUnsafePtr = types.Typ[types.UnsafePointer]
)

// ---------- Node creation ----------

// nextNode returns the index of the next unused node.
func (a *analysis) nextNode() nodeid {
	return nodeid(len(a.nodes))
}

// addNodes creates nodes for all scalar elements in type typ, and
// returns the id of the first one, or zero if the type was
// analytically uninteresting.
//
Esempio n. 13
0
func (c *funcContext) translateExpr(expr ast.Expr) *expression {
	exprType := c.p.info.Types[expr].Type
	if value := c.p.info.Types[expr].Value; value != nil {
		basic := types.Typ[types.String]
		if value.Kind() != exact.String { // workaround for bug in go/types
			basic = exprType.Underlying().(*types.Basic)
		}
		switch {
		case basic.Info()&types.IsBoolean != 0:
			return c.formatExpr("%s", strconv.FormatBool(exact.BoolVal(value)))
		case basic.Info()&types.IsInteger != 0:
			if is64Bit(basic) {
				d, _ := exact.Uint64Val(value)
				if basic.Kind() == types.Int64 {
					return c.formatExpr("new %s(%s, %s)", c.typeName(exprType), strconv.FormatInt(int64(d)>>32, 10), strconv.FormatUint(d&(1<<32-1), 10))
				}
				return c.formatExpr("new %s(%s, %s)", c.typeName(exprType), strconv.FormatUint(d>>32, 10), strconv.FormatUint(d&(1<<32-1), 10))
			}
			d, _ := exact.Int64Val(value)
			return c.formatExpr("%s", strconv.FormatInt(d, 10))
		case basic.Info()&types.IsFloat != 0:
			f, _ := exact.Float64Val(value)
			return c.formatExpr("%s", strconv.FormatFloat(f, 'g', -1, 64))
		case basic.Info()&types.IsComplex != 0:
			r, _ := exact.Float64Val(exact.Real(value))
			i, _ := exact.Float64Val(exact.Imag(value))
			if basic.Kind() == types.UntypedComplex {
				exprType = types.Typ[types.Complex128]
			}
			return c.formatExpr("new %s(%s, %s)", c.typeName(exprType), strconv.FormatFloat(r, 'g', -1, 64), strconv.FormatFloat(i, 'g', -1, 64))
		case basic.Info()&types.IsString != 0:
			return c.formatExpr("%s", encodeString(exact.StringVal(value)))
		default:
			panic("Unhandled constant type: " + basic.String())
		}
	}

	switch e := expr.(type) {
	case *ast.CompositeLit:
		if ptrType, isPointer := exprType.(*types.Pointer); isPointer {
			exprType = ptrType.Elem()
		}

		collectIndexedElements := func(elementType types.Type) []string {
			elements := make([]string, 0)
			i := 0
			zero := c.zeroValue(elementType)
			for _, element := range e.Elts {
				if kve, isKve := element.(*ast.KeyValueExpr); isKve {
					key, _ := exact.Int64Val(c.p.info.Types[kve.Key].Value)
					i = int(key)
					element = kve.Value
				}
				for len(elements) <= i {
					elements = append(elements, zero)
				}
				elements[i] = c.translateImplicitConversion(element, elementType).String()
				i++
			}
			return elements
		}

		switch t := exprType.Underlying().(type) {
		case *types.Array:
			elements := collectIndexedElements(t.Elem())
			if len(elements) != 0 {
				zero := c.zeroValue(t.Elem())
				for len(elements) < int(t.Len()) {
					elements = append(elements, zero)
				}
				return c.formatExpr(`go$toNativeArray("%s", [%s])`, typeKind(t.Elem()), strings.Join(elements, ", "))
			}
			return c.formatExpr(`go$makeNativeArray("%s", %d, function() { return %s; })`, typeKind(t.Elem()), int(t.Len()), c.zeroValue(t.Elem()))
		case *types.Slice:
			return c.formatExpr("new %s([%s])", c.typeName(exprType), strings.Join(collectIndexedElements(t.Elem()), ", "))
		case *types.Map:
			mapVar := c.newVariable("_map")
			keyVar := c.newVariable("_key")
			assignments := ""
			for _, element := range e.Elts {
				kve := element.(*ast.KeyValueExpr)
				assignments += c.formatExpr(`%s = %s, %s[%s] = { k: %s, v: %s }, `, keyVar, c.translateImplicitConversion(kve.Key, t.Key()), mapVar, c.makeKey(c.newIdent(keyVar, t.Key()), t.Key()), keyVar, c.translateImplicitConversion(kve.Value, t.Elem())).String()
			}
			return c.formatExpr("(%s = new Go$Map(), %s%s)", mapVar, assignments, mapVar)
		case *types.Struct:
			elements := make([]string, t.NumFields())
			isKeyValue := true
			if len(e.Elts) != 0 {
				_, isKeyValue = e.Elts[0].(*ast.KeyValueExpr)
			}
			if !isKeyValue {
				for i, element := range e.Elts {
					elements[i] = c.translateImplicitConversion(element, t.Field(i).Type()).String()
				}
			}
			if isKeyValue {
				for i := range elements {
					elements[i] = c.zeroValue(t.Field(i).Type())
				}
				for _, element := range e.Elts {
					kve := element.(*ast.KeyValueExpr)
					for j := range elements {
						if kve.Key.(*ast.Ident).Name == t.Field(j).Name() {
							elements[j] = c.translateImplicitConversion(kve.Value, t.Field(j).Type()).String()
							break
						}
					}
				}
			}
			return c.formatExpr("new %s.Ptr(%s)", c.typeName(exprType), strings.Join(elements, ", "))
		default:
			panic(fmt.Sprintf("Unhandled CompositeLit type: %T\n", t))
		}

	case *ast.FuncLit:
		params, body := c.translateFunction(e.Type, exprType.(*types.Signature), e.Body.List)
		if len(c.escapingVars) != 0 {
			list := strings.Join(c.escapingVars, ", ")
			return c.formatExpr("(function(%s) { return function(%s) {\n%s%s}; })(%s)", list, strings.Join(params, ", "), string(body), strings.Repeat("\t", c.p.indentation), list)
		}
		return c.formatExpr("(function(%s) {\n%s%s})", strings.Join(params, ", "), string(body), strings.Repeat("\t", c.p.indentation))

	case *ast.UnaryExpr:
		switch e.Op {
		case token.AND:
			switch c.p.info.Types[e.X].Type.Underlying().(type) {
			case *types.Struct, *types.Array:
				return c.translateExpr(e.X)
			default:
				if _, isComposite := e.X.(*ast.CompositeLit); isComposite {
					return c.formatExpr("go$newDataPointer(%e, %s)", e.X, c.typeName(c.p.info.Types[e].Type))
				}
				closurePrefix := ""
				closureSuffix := ""
				if len(c.escapingVars) != 0 {
					list := strings.Join(c.escapingVars, ", ")
					closurePrefix = "(function(" + list + ") { return "
					closureSuffix = "; })(" + list + ")"
				}
				vVar := c.newVariable("v")
				return c.formatExpr("%snew %s(function() { return %e; }, function(%s) { %s; })%s", closurePrefix, c.typeName(exprType), e.X, vVar, c.translateAssign(e.X, vVar), closureSuffix)
			}
		case token.ARROW:
			return c.formatExpr("undefined")
		}

		t := c.p.info.Types[e.X].Type
		basic := t.Underlying().(*types.Basic)
		switch e.Op {
		case token.ADD:
			return c.translateExpr(e.X)
		case token.SUB:
			switch {
			case is64Bit(basic):
				return c.formatExpr("new %1s(-%2h, -%2l)", c.typeName(t), e.X)
			case basic.Info()&types.IsComplex != 0:
				return c.formatExpr("new %1s(-%2r, -%2i)", c.typeName(t), e.X)
			case basic.Info()&types.IsUnsigned != 0:
				return c.fixNumber(c.formatExpr("-%e", e.X), basic)
			default:
				return c.formatExpr("-%e", e.X)
			}
		case token.XOR:
			if is64Bit(basic) {
				return c.formatExpr("new %1s(~%2h, ~%2l >>> 0)", c.typeName(t), e.X)
			}
			return c.fixNumber(c.formatExpr("~%e", e.X), basic)
		case token.NOT:
			x := c.translateExpr(e.X)
			if x.String() == "true" {
				return c.formatExpr("false")
			}
			if x.String() == "false" {
				return c.formatExpr("true")
			}
			return c.formatExpr("!%s", x)
		default:
			panic(e.Op)
		}

	case *ast.BinaryExpr:
		if e.Op == token.NEQ {
			return c.formatExpr("!(%s)", c.translateExpr(&ast.BinaryExpr{
				X:  e.X,
				Op: token.EQL,
				Y:  e.Y,
			}))
		}

		t := c.p.info.Types[e.X].Type
		t2 := c.p.info.Types[e.Y].Type
		_, isInterface := t2.Underlying().(*types.Interface)
		if isInterface {
			t = t2
		}

		if basic, isBasic := t.Underlying().(*types.Basic); isBasic && basic.Info()&types.IsNumeric != 0 {
			if is64Bit(basic) {
				switch e.Op {
				case token.MUL:
					return c.formatExpr("go$mul64(%e, %e)", e.X, e.Y)
				case token.QUO:
					return c.formatExpr("go$div64(%e, %e, false)", e.X, e.Y)
				case token.REM:
					return c.formatExpr("go$div64(%e, %e, true)", e.X, e.Y)
				case token.SHL:
					return c.formatExpr("go$shiftLeft64(%e, %f)", e.X, e.Y)
				case token.SHR:
					return c.formatExpr("go$shiftRight%s(%e, %f)", toJavaScriptType(basic), e.X, e.Y)
				case token.EQL:
					return c.formatExpr("(%1h === %2h && %1l === %2l)", e.X, e.Y)
				case token.LSS:
					return c.formatExpr("(%1h < %2h || (%1h === %2h && %1l < %2l))", e.X, e.Y)
				case token.LEQ:
					return c.formatExpr("(%1h < %2h || (%1h === %2h && %1l <= %2l))", e.X, e.Y)
				case token.GTR:
					return c.formatExpr("(%1h > %2h || (%1h === %2h && %1l > %2l))", e.X, e.Y)
				case token.GEQ:
					return c.formatExpr("(%1h > %2h || (%1h === %2h && %1l >= %2l))", e.X, e.Y)
				case token.ADD, token.SUB:
					return c.formatExpr("new %3s(%1h %4t %2h, %1l %4t %2l)", e.X, e.Y, c.typeName(t), e.Op)
				case token.AND, token.OR, token.XOR:
					return c.formatExpr("new %3s(%1h %4t %2h, (%1l %4t %2l) >>> 0)", e.X, e.Y, c.typeName(t), e.Op)
				case token.AND_NOT:
					return c.formatExpr("new %3s(%1h &~ %2h, (%1l &~ %2l) >>> 0)", e.X, e.Y, c.typeName(t))
				default:
					panic(e.Op)
				}
			}

			if basic.Info()&types.IsComplex != 0 {
				switch e.Op {
				case token.EQL:
					if basic.Kind() == types.Complex64 {
						return c.formatExpr("(go$float32IsEqual(%1r, %2r) && go$float32IsEqual(%1i, %2i))", e.X, e.Y)
					}
					return c.formatExpr("(%1r === %2r && %1i === %2i)", e.X, e.Y)
				case token.ADD, token.SUB:
					return c.formatExpr("new %3s(%1r %4t %2r, %1i %4t %2i)", e.X, e.Y, c.typeName(t), e.Op)
				case token.MUL:
					return c.formatExpr("new %3s(%1r * %2r - %1i * %2i, %1r * %2i + %1i * %2r)", e.X, e.Y, c.typeName(t))
				case token.QUO:
					return c.formatExpr("go$divComplex(%e, %e)", e.X, e.Y)
				default:
					panic(e.Op)
				}
			}

			switch e.Op {
			case token.EQL:
				if basic.Kind() == types.Float32 {
					return c.formatParenExpr("go$float32IsEqual(%e, %e)", e.X, e.Y)
				}
				return c.formatParenExpr("%e === %e", e.X, e.Y)
			case token.LSS, token.LEQ, token.GTR, token.GEQ:
				return c.formatExpr("%e %t %e", e.X, e.Op, e.Y)
			case token.ADD, token.SUB:
				if basic.Info()&types.IsInteger != 0 {
					return c.fixNumber(c.formatExpr("%e %t %e", e.X, e.Op, e.Y), basic)
				}
				return c.formatExpr("%e %t %e", e.X, e.Op, e.Y)
			case token.MUL:
				switch basic.Kind() {
				case types.Int32, types.Int:
					return c.formatParenExpr("(((%1e >>> 16 << 16) * %2e >> 0) + (%1e << 16 >>> 16) * %2e) >> 0", e.X, e.Y)
				case types.Uint32, types.Uint, types.Uintptr:
					return c.formatParenExpr("(((%1e >>> 16 << 16) * %2e >>> 0) + (%1e << 16 >>> 16) * %2e) >>> 0", e.X, e.Y)
				case types.Float32, types.Float64:
					return c.formatExpr("%e * %e", e.X, e.Y)
				default:
					return c.fixNumber(c.formatExpr("%e * %e", e.X, e.Y), basic)
				}
			case token.QUO:
				if basic.Info()&types.IsInteger != 0 {
					// cut off decimals
					shift := ">>"
					if basic.Info()&types.IsUnsigned != 0 {
						shift = ">>>"
					}
					return c.formatExpr(`(%1s = %2e / %3e, (%1s === %1s && %1s !== 1/0 && %1s !== -1/0) ? %1s %4s 0 : go$throwRuntimeError("integer divide by zero"))`, c.newVariable("_q"), e.X, e.Y, shift)
				}
				return c.formatExpr("%e / %e", e.X, e.Y)
			case token.REM:
				return c.formatExpr(`(%1s = %2e %% %3e, %1s === %1s ? %1s : go$throwRuntimeError("integer divide by zero"))`, c.newVariable("_r"), e.X, e.Y)
			case token.SHL, token.SHR:
				op := e.Op.String()
				if e.Op == token.SHR && basic.Info()&types.IsUnsigned != 0 {
					op = ">>>"
				}
				if c.p.info.Types[e.Y].Value != nil {
					return c.fixNumber(c.formatExpr("%e %s %e", e.X, op, e.Y), basic)
				}
				if e.Op == token.SHR && basic.Info()&types.IsUnsigned == 0 {
					return c.fixNumber(c.formatParenExpr("%e >> go$min(%e, 31)", e.X, e.Y), basic)
				}
				y := c.newVariable("y")
				return c.fixNumber(c.formatExpr("(%s = %s, %s < 32 ? (%e %s %s) : 0)", y, c.translateImplicitConversion(e.Y, types.Typ[types.Uint]), y, e.X, op, y), basic)
			case token.AND, token.OR:
				if basic.Info()&types.IsUnsigned != 0 {
					return c.formatParenExpr("(%e %t %e) >>> 0", e.X, e.Op, e.Y)
				}
				return c.formatParenExpr("%e %t %e", e.X, e.Op, e.Y)
			case token.AND_NOT:
				return c.formatParenExpr("%e & ~%e", e.X, e.Y)
			case token.XOR:
				return c.fixNumber(c.formatParenExpr("%e ^ %e", e.X, e.Y), basic)
			default:
				panic(e.Op)
			}
		}

		switch e.Op {
		case token.ADD, token.LSS, token.LEQ, token.GTR, token.GEQ:
			return c.formatExpr("%e %t %e", e.X, e.Op, e.Y)
		case token.LAND:
			x := c.translateExpr(e.X)
			y := c.translateExpr(e.Y)
			if x.String() == "false" {
				return c.formatExpr("false")
			}
			return c.formatExpr("%s && %s", x, y)
		case token.LOR:
			x := c.translateExpr(e.X)
			y := c.translateExpr(e.Y)
			if x.String() == "true" {
				return c.formatExpr("true")
			}
			return c.formatExpr("%s || %s", x, y)
		case token.EQL:
			switch u := t.Underlying().(type) {
			case *types.Struct:
				x := c.newVariable("x")
				y := c.newVariable("y")
				var conds []string
				for i := 0; i < u.NumFields(); i++ {
					field := u.Field(i)
					if field.Name() == "_" {
						continue
					}
					conds = append(conds, c.translateExpr(&ast.BinaryExpr{
						X:  c.newIdent(x+"."+fieldName(u, i), field.Type()),
						Op: token.EQL,
						Y:  c.newIdent(y+"."+fieldName(u, i), field.Type()),
					}).String())
				}
				if len(conds) == 0 {
					conds = []string{"true"}
				}
				return c.formatExpr("(%s = %e, %s = %e, %s)", x, e.X, y, e.Y, strings.Join(conds, " && "))
			case *types.Interface:
				if isJsObject(t) {
					return c.formatExpr("%s === %s", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t))
				}
				return c.formatExpr("go$interfaceIsEqual(%s, %s)", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t))
			case *types.Array:
				return c.formatExpr("go$arrayIsEqual(%e, %e)", e.X, e.Y)
			case *types.Pointer:
				xUnary, xIsUnary := e.X.(*ast.UnaryExpr)
				yUnary, yIsUnary := e.Y.(*ast.UnaryExpr)
				if xIsUnary && xUnary.Op == token.AND && yIsUnary && yUnary.Op == token.AND {
					xIndex, xIsIndex := xUnary.X.(*ast.IndexExpr)
					yIndex, yIsIndex := yUnary.X.(*ast.IndexExpr)
					if xIsIndex && yIsIndex {
						return c.formatExpr("go$sliceIsEqual(%e, %f, %e, %f)", xIndex.X, xIndex.Index, yIndex.X, yIndex.Index)
					}
				}
				switch u.Elem().Underlying().(type) {
				case *types.Struct, *types.Interface:
					return c.formatExpr("%s === %s", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t))
				case *types.Array:
					return c.formatExpr("go$arrayIsEqual(%s, %s)", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t))
				default:
					return c.formatExpr("go$pointerIsEqual(%s, %s)", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t))
				}
			default:
				return c.formatExpr("%s === %s", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t))
			}
		default:
			panic(e.Op)
		}

	case *ast.ParenExpr:
		x := c.translateExpr(e.X)
		if x.String() == "true" || x.String() == "false" {
			return x
		}
		return c.formatParenExpr("%s", x)

	case *ast.IndexExpr:
		switch t := c.p.info.Types[e.X].Type.Underlying().(type) {
		case *types.Array, *types.Pointer:
			return c.formatExpr("%e[%f]", e.X, e.Index)
		case *types.Slice:
			return c.formatExpr(`((%2f < 0 || %2f >= %1e.length) ? go$throwRuntimeError("index out of range") : %1e.array[%1e.offset + %2f])`, e.X, e.Index)
		case *types.Map:
			key := c.makeKey(e.Index, t.Key())
			if _, isTuple := exprType.(*types.Tuple); isTuple {
				return c.formatExpr(`(%1s = %2e[%3s], %1s !== undefined ? [%1s.v, true] : [%4s, false])`, c.newVariable("_entry"), e.X, key, c.zeroValue(t.Elem()))
			}
			return c.formatExpr(`(%1s = %2e[%3s], %1s !== undefined ? %1s.v : %4s)`, c.newVariable("_entry"), e.X, key, c.zeroValue(t.Elem()))
		case *types.Basic:
			return c.formatExpr("%e.charCodeAt(%f)", e.X, e.Index)
		default:
			panic(fmt.Sprintf("Unhandled IndexExpr: %T\n", t))
		}

	case *ast.SliceExpr:
		if b, isBasic := c.p.info.Types[e.X].Type.Underlying().(*types.Basic); isBasic && b.Info()&types.IsString != 0 {
			switch {
			case e.Low == nil && e.High == nil:
				return c.translateExpr(e.X)
			case e.Low == nil:
				return c.formatExpr("%e.substring(0, %f)", e.X, e.High)
			case e.High == nil:
				return c.formatExpr("%e.substring(%f)", e.X, e.Low)
			default:
				return c.formatExpr("%e.substring(%f, %f)", e.X, e.Low, e.High)
			}
		}
		slice := c.translateConversionToSlice(e.X, exprType)
		switch {
		case e.Low == nil && e.High == nil:
			return c.formatExpr("%s", slice)
		case e.Low == nil:
			if e.Max != nil {
				return c.formatExpr("go$subslice(%s, 0, %f, %f)", slice, e.High, e.Max)
			}
			return c.formatExpr("go$subslice(%s, 0, %f)", slice, e.High)
		case e.High == nil:
			return c.formatExpr("go$subslice(%s, %f)", slice, e.Low)
		default:
			if e.Max != nil {
				return c.formatExpr("go$subslice(%s, %f, %f, %f)", slice, e.Low, e.High, e.Max)
			}
			return c.formatExpr("go$subslice(%s, %f, %f)", slice, e.Low, e.High)
		}

	case *ast.SelectorExpr:
		sel := c.p.info.Selections[e]
		parameterName := func(v *types.Var) string {
			if v.Anonymous() || v.Name() == "" {
				return c.newVariable("param")
			}
			return c.newVariable(v.Name())
		}
		makeParametersList := func() []string {
			params := sel.Obj().Type().(*types.Signature).Params()
			names := make([]string, params.Len())
			for i := 0; i < params.Len(); i++ {
				names[i] = parameterName(params.At(i))
			}
			return names
		}

		switch sel.Kind() {
		case types.FieldVal:
			fields, jsTag := c.translateSelection(sel)
			if jsTag != "" {
				if _, ok := sel.Type().(*types.Signature); ok {
					return c.formatExpr("go$internalize(%1e.%2s.%3s, %4s, %1e.%2s)", e.X, strings.Join(fields, "."), jsTag, c.typeName(sel.Type()))
				}
				return c.internalize(c.formatExpr("%e.%s.%s", e.X, strings.Join(fields, "."), jsTag), sel.Type())
			}
			return c.formatExpr("%e.%s", e.X, strings.Join(fields, "."))
		case types.MethodVal:
			if !sel.Obj().Exported() {
				c.p.dependencies[sel.Obj()] = true
			}
			parameters := makeParametersList()
			target := c.translateExpr(e.X)
			if isWrapped(sel.Recv()) {
				target = c.formatParenExpr("new %s(%s)", c.typeName(sel.Recv()), target)
			}
			recv := c.newVariable("_recv")
			return c.formatExpr("(%s = %s, function(%s) { return %s.%s(%s); })", recv, target, strings.Join(parameters, ", "), recv, e.Sel.Name, strings.Join(parameters, ", "))
		case types.MethodExpr:
			if !sel.Obj().Exported() {
				c.p.dependencies[sel.Obj()] = true
			}
			recv := "recv"
			if isWrapped(sel.Recv()) {
				recv = fmt.Sprintf("(new %s(recv))", c.typeName(sel.Recv()))
			}
			parameters := makeParametersList()
			return c.formatExpr("(function(%s) { return %s.%s(%s); })", strings.Join(append([]string{"recv"}, parameters...), ", "), recv, sel.Obj().(*types.Func).Name(), strings.Join(parameters, ", "))
		case types.PackageObj:
			if isJsPackage(sel.Obj().Pkg()) {
				switch sel.Obj().Name() {
				case "Global":
					return c.formatExpr("go$global")
				case "This":
					if c.flattened {
						return c.formatExpr("go$this")
					}
					return c.formatExpr("this")
				case "Arguments":
					args := "arguments"
					if c.flattened {
						args = "go$args"
					}

					return c.formatExpr(`new (go$sliceType(%s.Object))(go$global.Array.prototype.slice.call(%s))`, c.p.pkgVars["github.com/gopherjs/gopherjs/js"], args)
				default:
					panic("Invalid js package object: " + sel.Obj().Name())
				}
			}
			return c.formatExpr("%s", c.objectName(sel.Obj()))
		}
		panic("")

	case *ast.CallExpr:
		plainFun := e.Fun
		for {
			if p, isParen := plainFun.(*ast.ParenExpr); isParen {
				plainFun = p.X
				continue
			}
			break
		}

		var isType func(ast.Expr) bool
		isType = func(expr ast.Expr) bool {
			switch e := expr.(type) {
			case *ast.ArrayType, *ast.ChanType, *ast.FuncType, *ast.InterfaceType, *ast.MapType, *ast.StructType:
				return true
			case *ast.StarExpr:
				return isType(e.X)
			case *ast.Ident:
				_, ok := c.p.info.Uses[e].(*types.TypeName)
				return ok
			case *ast.SelectorExpr:
				_, ok := c.p.info.Uses[e.Sel].(*types.TypeName)
				return ok
			case *ast.ParenExpr:
				return isType(e.X)
			default:
				return false
			}
		}

		if isType(plainFun) {
			return c.formatExpr("%s", c.translateConversion(e.Args[0], c.p.info.Types[plainFun].Type))
		}

		var fun *expression
		switch f := plainFun.(type) {
		case *ast.Ident:
			if o, ok := c.p.info.Uses[f].(*types.Builtin); ok {
				switch o.Name() {
				case "new":
					t := c.p.info.Types[e].Type.(*types.Pointer)
					if c.p.pkg.Path() == "syscall" && types.Identical(t.Elem().Underlying(), types.Typ[types.Uintptr]) {
						return c.formatExpr("new Uint8Array(8)")
					}
					switch t.Elem().Underlying().(type) {
					case *types.Struct, *types.Array:
						return c.formatExpr("%s", c.zeroValue(t.Elem()))
					default:
						return c.formatExpr("go$newDataPointer(%s, %s)", c.zeroValue(t.Elem()), c.typeName(t))
					}
				case "make":
					switch argType := c.p.info.Types[e.Args[0]].Type.Underlying().(type) {
					case *types.Slice:
						t := c.typeName(c.p.info.Types[e.Args[0]].Type)
						if len(e.Args) == 3 {
							return c.formatExpr("%s.make(%f, %f, function() { return %s; })", t, e.Args[1], e.Args[2], c.zeroValue(argType.Elem()))
						}
						return c.formatExpr("%s.make(%f, 0, function() { return %s; })", t, e.Args[1], c.zeroValue(argType.Elem()))
					case *types.Map:
						return c.formatExpr("new Go$Map()")
					case *types.Chan:
						return c.formatExpr("new %s()", c.typeName(c.p.info.Types[e.Args[0]].Type))
					default:
						panic(fmt.Sprintf("Unhandled make type: %T\n", argType))
					}
				case "len":
					arg := c.translateExpr(e.Args[0])
					switch argType := c.p.info.Types[e.Args[0]].Type.Underlying().(type) {
					case *types.Basic, *types.Slice:
						return c.formatExpr("%s.length", arg)
					case *types.Pointer:
						return c.formatExpr("(%s, %d)", arg, argType.Elem().(*types.Array).Len())
					case *types.Map:
						return c.formatExpr("go$keys(%s).length", arg)
					case *types.Chan:
						return c.formatExpr("0")
					// length of array is constant
					default:
						panic(fmt.Sprintf("Unhandled len type: %T\n", argType))
					}
				case "cap":
					arg := c.translateExpr(e.Args[0])
					switch argType := c.p.info.Types[e.Args[0]].Type.Underlying().(type) {
					case *types.Slice:
						return c.formatExpr("%s.capacity", arg)
					case *types.Pointer:
						return c.formatExpr("(%s, %d)", arg, argType.Elem().(*types.Array).Len())
					case *types.Chan:
						return c.formatExpr("0")
					// capacity of array is constant
					default:
						panic(fmt.Sprintf("Unhandled cap type: %T\n", argType))
					}
				case "panic":
					return c.formatExpr("throw go$panic(%s)", c.translateImplicitConversion(e.Args[0], types.NewInterface(nil, nil)))
				case "append":
					if len(e.Args) == 1 {
						return c.translateExpr(e.Args[0])
					}
					if e.Ellipsis.IsValid() {
						return c.formatExpr("go$appendSlice(%e, %s)", e.Args[0], c.translateConversionToSlice(e.Args[1], exprType))
					}
					sliceType := exprType.Underlying().(*types.Slice)
					return c.formatExpr("go$append(%e, %s)", e.Args[0], strings.Join(c.translateExprSlice(e.Args[1:], sliceType.Elem()), ", "))
				case "delete":
					return c.formatExpr(`delete %e[%s]`, e.Args[0], c.makeKey(e.Args[1], c.p.info.Types[e.Args[0]].Type.Underlying().(*types.Map).Key()))
				case "copy":
					if basic, isBasic := c.p.info.Types[e.Args[1]].Type.Underlying().(*types.Basic); isBasic && basic.Info()&types.IsString != 0 {
						return c.formatExpr("go$copyString(%e, %e)", e.Args[0], e.Args[1])
					}
					return c.formatExpr("go$copySlice(%e, %e)", e.Args[0], e.Args[1])
				case "print", "println":
					return c.formatExpr("console.log(%s)", strings.Join(c.translateExprSlice(e.Args, nil), ", "))
				case "complex":
					return c.formatExpr("new %s(%e, %e)", c.typeName(c.p.info.Types[e].Type), e.Args[0], e.Args[1])
				case "real":
					return c.formatExpr("%e.real", e.Args[0])
				case "imag":
					return c.formatExpr("%e.imag", e.Args[0])
				case "recover":
					return c.formatExpr("go$recover()")
				case "close":
					return c.formatExpr(`go$notSupported("close")`)
				default:
					panic(fmt.Sprintf("Unhandled builtin: %s\n", o.Name()))
				}
			}
			fun = c.translateExpr(plainFun)

		case *ast.SelectorExpr:
			sel := c.p.info.Selections[f]
			o := sel.Obj()

			externalizeExpr := func(e ast.Expr) string {
				t := c.p.info.Types[e].Type
				if types.Identical(t, types.Typ[types.UntypedNil]) {
					return "null"
				}
				return c.externalize(c.translateExpr(e).String(), t)
			}
			externalizeArgs := func(args []ast.Expr) string {
				s := make([]string, len(args))
				for i, arg := range args {
					s[i] = externalizeExpr(arg)
				}
				return strings.Join(s, ", ")
			}

			switch sel.Kind() {
			case types.MethodVal:
				if !sel.Obj().Exported() {
					c.p.dependencies[sel.Obj()] = true
				}

				methodName := o.Name()
				if reservedKeywords[methodName] {
					methodName += "$"
				}

				fun = c.translateExpr(f.X)
				t := sel.Recv()
				for _, index := range sel.Index()[:len(sel.Index())-1] {
					if ptr, isPtr := t.(*types.Pointer); isPtr {
						t = ptr.Elem()
					}
					s := t.Underlying().(*types.Struct)
					fun = c.formatExpr("%s.%s", fun, fieldName(s, index))
					t = s.Field(index).Type()
				}

				if isJsPackage(o.Pkg()) {
					globalRef := func(id string) string {
						if fun.String() == "go$global" && len(id) > 3 && strings.EqualFold(id[:3], "go$") {
							return id
						}
						return fun.String() + "." + id
					}
					switch o.Name() {
					case "Get":
						if id, ok := c.identifierConstant(e.Args[0]); ok {
							return c.formatExpr("%s", globalRef(id))
						}
						return c.formatExpr("%s[go$externalize(%e, Go$String)]", fun, e.Args[0])
					case "Set":
						if id, ok := c.identifierConstant(e.Args[0]); ok {
							return c.formatExpr("%s = %s", globalRef(id), externalizeExpr(e.Args[1]))
						}
						return c.formatExpr("%s[go$externalize(%e, Go$String)] = %s", fun, e.Args[0], externalizeExpr(e.Args[1]))
					case "Delete":
						return c.formatExpr("delete %s[go$externalize(%e, Go$String)]", fun, e.Args[0])
					case "Length":
						return c.formatExpr("go$parseInt(%s.length)", fun)
					case "Index":
						return c.formatExpr("%s[%e]", fun, e.Args[0])
					case "SetIndex":
						return c.formatExpr("%s[%e] = %s", fun, e.Args[0], externalizeExpr(e.Args[1]))
					case "Call":
						if id, ok := c.identifierConstant(e.Args[0]); ok {
							if e.Ellipsis.IsValid() {
								objVar := c.newVariable("obj")
								return c.formatExpr("(%s = %s, %s.%s.apply(%s, %s))", objVar, fun, objVar, id, objVar, externalizeExpr(e.Args[1]))
							}
							return c.formatExpr("%s(%s)", globalRef(id), externalizeArgs(e.Args[1:]))
						}
						if e.Ellipsis.IsValid() {
							objVar := c.newVariable("obj")
							return c.formatExpr("(%s = %s, %s[go$externalize(%e, Go$String)].apply(%s, %s))", objVar, fun, objVar, e.Args[0], objVar, externalizeExpr(e.Args[1]))
						}
						return c.formatExpr("%s[go$externalize(%e, Go$String)](%s)", fun, e.Args[0], externalizeArgs(e.Args[1:]))
					case "Invoke":
						if e.Ellipsis.IsValid() {
							return c.formatExpr("%s.apply(undefined, %s)", fun, externalizeExpr(e.Args[0]))
						}
						return c.formatExpr("%s(%s)", fun, externalizeArgs(e.Args))
					case "New":
						if e.Ellipsis.IsValid() {
							return c.formatExpr("new (go$global.Function.prototype.bind.apply(%s, [undefined].concat(%s)))", fun, externalizeExpr(e.Args[0]))
						}
						return c.formatExpr("new (%s)(%s)", fun, externalizeArgs(e.Args))
					case "Bool":
						return c.internalize(fun, types.Typ[types.Bool])
					case "Str":
						return c.internalize(fun, types.Typ[types.String])
					case "Int":
						return c.internalize(fun, types.Typ[types.Int])
					case "Int64":
						return c.internalize(fun, types.Typ[types.Int64])
					case "Uint64":
						return c.internalize(fun, types.Typ[types.Uint64])
					case "Float":
						return c.internalize(fun, types.Typ[types.Float64])
					case "Interface":
						return c.internalize(fun, types.NewInterface(nil, nil))
					case "Unsafe":
						return fun
					case "IsUndefined":
						return c.formatParenExpr("%s === undefined", fun)
					case "IsNull":
						return c.formatParenExpr("%s === null", fun)
					default:
						panic("Invalid js package object: " + o.Name())
					}
				}

				methodsRecvType := o.Type().(*types.Signature).Recv().Type()
				_, pointerExpected := methodsRecvType.(*types.Pointer)
				_, isPointer := t.Underlying().(*types.Pointer)
				_, isStruct := t.Underlying().(*types.Struct)
				_, isArray := t.Underlying().(*types.Array)
				if pointerExpected && !isPointer && !isStruct && !isArray {
					vVar := c.newVariable("v")
					fun = c.formatExpr("(new %s(function() { return %s; }, function(%s) { %s = %s; })).%s", c.typeName(methodsRecvType), fun, vVar, fun, vVar, methodName)
					break
				}

				if isWrapped(t) {
					fun = c.formatExpr("(new %s(%s)).%s", c.typeName(t), fun, methodName)
					break
				}
				fun = c.formatExpr("%s.%s", fun, methodName)

			case types.PackageObj:
				if isJsPackage(o.Pkg()) && o.Name() == "InternalObject" {
					return c.translateExpr(e.Args[0])
				}
				fun = c.translateExpr(f)

			case types.FieldVal:
				fields, jsTag := c.translateSelection(sel)
				if jsTag != "" {
					sig := sel.Type().(*types.Signature)
					return c.internalize(c.formatExpr("%e.%s.%s(%s)", f.X, strings.Join(fields, "."), jsTag, externalizeArgs(e.Args)), sig.Results().At(0).Type())
				}
				fun = c.formatExpr("%e.%s", f.X, strings.Join(fields, "."))

			case types.MethodExpr:
				fun = c.translateExpr(f)

			default:
				panic("")
			}
		default:
			fun = c.translateExpr(plainFun)
		}

		sig := c.p.info.Types[plainFun].Type.Underlying().(*types.Signature)
		if len(e.Args) == 1 {
			if tuple, isTuple := c.p.info.Types[e.Args[0]].Type.(*types.Tuple); isTuple {
				tupleVar := c.newVariable("_tuple")
				args := make([]ast.Expr, tuple.Len())
				for i := range args {
					args[i] = c.newIdent(c.formatExpr("%s[%d]", tupleVar, i).String(), tuple.At(i).Type())
				}
				return c.formatExpr("(%s = %e, %s(%s))", tupleVar, e.Args[0], fun, strings.Join(c.translateArgs(sig, args, false), ", "))
			}
		}
		return c.formatExpr("%s(%s)", fun, strings.Join(c.translateArgs(sig, e.Args, e.Ellipsis.IsValid()), ", "))

	case *ast.StarExpr:
		if c1, isCall := e.X.(*ast.CallExpr); isCall && len(c1.Args) == 1 {
			if c2, isCall := c1.Args[0].(*ast.CallExpr); isCall && len(c2.Args) == 1 && types.Identical(c.p.info.Types[c2.Fun].Type, types.Typ[types.UnsafePointer]) {
				if unary, isUnary := c2.Args[0].(*ast.UnaryExpr); isUnary && unary.Op == token.AND {
					return c.translateExpr(unary.X) // unsafe conversion
				}
			}
		}
		switch exprType.Underlying().(type) {
		case *types.Struct, *types.Array:
			return c.translateExpr(e.X)
		}
		return c.formatExpr("%e.go$get()", e.X)

	case *ast.TypeAssertExpr:
		if e.Type == nil {
			return c.translateExpr(e.X)
		}
		t := c.p.info.Types[e.Type].Type
		check := "%1e !== null && " + c.typeCheck("%1e.constructor", t)
		valueSuffix := ""
		if _, isInterface := t.Underlying().(*types.Interface); !isInterface {
			valueSuffix = ".go$val"
		}
		if _, isTuple := exprType.(*types.Tuple); isTuple {
			return c.formatExpr("("+check+" ? [%1e%2s, true] : [%3s, false])", e.X, valueSuffix, c.zeroValue(c.p.info.Types[e.Type].Type))
		}
		return c.formatExpr("("+check+" ? %1e%2s : go$typeAssertionFailed(%1e, %3s))", e.X, valueSuffix, c.typeName(t))

	case *ast.Ident:
		if e.Name == "_" {
			panic("Tried to translate underscore identifier.")
		}
		switch o := c.p.info.Uses[e].(type) {
		case *types.PkgName:
			return c.formatExpr("%s", c.p.pkgVars[o.Pkg().Path()])
		case *types.Var, *types.Const:
			return c.formatExpr("%s", c.objectName(o))
		case *types.Func:
			return c.formatExpr("%s", c.objectName(o))
		case *types.TypeName:
			return c.formatExpr("%s", c.typeName(o.Type()))
		case *types.Nil:
			return c.formatExpr("%s", c.zeroValue(c.p.info.Types[e].Type))
		default:
			panic(fmt.Sprintf("Unhandled object: %T\n", o))
		}

	case *This:
		this := "this"
		if c.flattened {
			this = "go$this"
		}
		if isWrapped(c.p.info.Types[e].Type) {
			this += ".go$val"
		}
		return c.formatExpr(this)

	case nil:
		return c.formatExpr("")

	default:
		panic(fmt.Sprintf("Unhandled expression: %T\n", e))

	}
}