accounts/abi: enable struct golang binding generation (#18491)

* accounts/abi, cmd/abigen: support tuple

accounts/abi/bind, cmd/abigen: add objc back

accounts/abi/bind: use byte[24] as function indicator

accounts/abi/bind: resolve struct slice or array

accounts/abi/bind: remove sort logic

accounts: fix issues in abi

* accounts/abi: address comment

accounts/abi/argument.go

@@ -119,11 +119,22 @@ func unpack(t *Type, dst interface{}, src interface{}) error {
 		dstVal = reflect.ValueOf(dst).Elem()
 		srcVal = reflect.ValueOf(src)
 	)
-
+	tuple, typ := false, t
-	if t.T != TupleTy && !((t.T == SliceTy || t.T == ArrayTy) && t.Elem.T == TupleTy) {
+	for {
+		if typ.T == SliceTy || typ.T == ArrayTy {
+			typ = typ.Elem
+			continue
+		}
+		tuple = typ.T == TupleTy
+		break
+	}
+	if !tuple {
 		return set(dstVal, srcVal)
 	}
 
+	// Dereferences interface or pointer wrapper
+	dstVal = indirectInterfaceOrPtr(dstVal)
+
 	switch t.T {
 	case TupleTy:
 		if dstVal.Kind() != reflect.Struct {
@@ -191,7 +202,7 @@ func (arguments Arguments) unpackAtomic(v interface{}, marshalledValues interfac
 	argument := arguments.NonIndexed()[0]
 	elem := reflect.ValueOf(v).Elem()
 
-	if elem.Kind() == reflect.Struct {
+	if elem.Kind() == reflect.Struct && argument.Type.T != TupleTy {
 		fieldmap, err := mapArgNamesToStructFields([]string{argument.Name}, elem)
 		if err != nil {
 			return err

accounts/abi/bind/bind.go

@@ -22,6 +22,7 @@ package bind
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"go/format"
 	"regexp"
@@ -38,6 +39,7 @@ type Lang int
 const (
 	LangGo Lang = iota
 	LangJava
+	LangObjC
 )
 
 // Bind generates a Go wrapper around a contract ABI. This wrapper isn't meant
@@ -62,11 +64,12 @@ func Bind(types []string, abis []string, bytecodes []string, fsigs []map[string]
 			return r
 		}, abis[i])
 
-		// Extract the call and transact methods; events; and sort them alphabetically
+		// Extract the call and transact methods; events, struct definitions; and sort them alphabetically
 		var (
 			calls     = make(map[string]*tmplMethod)
 			transacts = make(map[string]*tmplMethod)
 			events    = make(map[string]*tmplEvent)
+			structs   = make(map[string]*tmplStruct)
 		)
 		for _, original := range evmABI.Methods {
 			// Normalize the method for capital cases and non-anonymous inputs/outputs
@@ -79,6 +82,9 @@ func Bind(types []string, abis []string, bytecodes []string, fsigs []map[string]
 				if input.Name == "" {
 					normalized.Inputs[j].Name = fmt.Sprintf("arg%d", j)
 				}
+				if _, exist := structs[input.Type.String()]; input.Type.T == abi.TupleTy && !exist {
+					bindStructType[lang](input.Type, structs)
+				}
 			}
 			normalized.Outputs = make([]abi.Argument, len(original.Outputs))
 			copy(normalized.Outputs, original.Outputs)
@@ -86,6 +92,9 @@ func Bind(types []string, abis []string, bytecodes []string, fsigs []map[string]
 				if output.Name != "" {
 					normalized.Outputs[j].Name = capitalise(output.Name)
 				}
+				if _, exist := structs[output.Type.String()]; output.Type.T == abi.TupleTy && !exist {
+					bindStructType[lang](output.Type, structs)
+				}
 			}
 			// Append the methods to the call or transact lists
 			if original.Const {
@@ -111,11 +120,20 @@ func Bind(types []string, abis []string, bytecodes []string, fsigs []map[string]
 					if input.Name == "" {
 						normalized.Inputs[j].Name = fmt.Sprintf("arg%d", j)
 					}
+					if _, exist := structs[input.Type.String()]; input.Type.T == abi.TupleTy && !exist {
+						bindStructType[lang](input.Type, structs)
+					}
 				}
 			}
 			// Append the event to the accumulator list
 			events[original.Name] = &tmplEvent{Original: original, Normalized: normalized}
 		}
+
+		// There is no easy way to pass arbitrary java objects to the Go side.
+		if len(structs) > 0 && lang == LangJava {
+			return "", errors.New("java binding for tuple arguments is not supported yet")
+		}
+
 		contracts[types[i]] = &tmplContract{
 			Type:        capitalise(types[i]),
 			InputABI:    strings.Replace(strippedABI, "\"", "\\\"", -1),
@@ -124,6 +142,7 @@ func Bind(types []string, abis []string, bytecodes []string, fsigs []map[string]
 			Calls:       calls,
 			Transacts:   transacts,
 			Events:      events,
+			Structs:     structs,
 		}
 		if len(fsigs) > i {
 			contracts[types[i]].FuncSigs = fsigs[i]
@@ -140,6 +159,8 @@ func Bind(types []string, abis []string, bytecodes []string, fsigs []map[string]
 		"bindtype":      bindType[lang],
 		"bindtopictype": bindTopicType[lang],
 		"namedtype":     namedType[lang],
+		"formatmethod":  formatMethod,
+		"formatevent":   formatEvent,
 		"capitalise":    capitalise,
 		"decapitalise":  decapitalise,
 	}
@@ -161,7 +182,7 @@ func Bind(types []string, abis []string, bytecodes []string, fsigs []map[string]
 
 // bindType is a set of type binders that convert Solidity types to some supported
 // programming language types.
-var bindType = map[Lang]func(kind abi.Type) string{
+var bindType = map[Lang]func(kind abi.Type, structs map[string]*tmplStruct) string{
 	LangGo:   bindTypeGo,
 	LangJava: bindTypeJava,
 }
@@ -193,13 +214,14 @@ func bindBasicTypeGo(kind abi.Type) string {
 // bindTypeGo converts solidity types to Go ones. Since there is no clear mapping
 // from all Solidity types to Go ones (e.g. uint17), those that cannot be exactly
 // mapped will use an upscaled type (e.g. BigDecimal).
-func bindTypeGo(kind abi.Type) string {
+func bindTypeGo(kind abi.Type, structs map[string]*tmplStruct) string {
-	// todo(rjl493456442) tuple
 	switch kind.T {
+	case abi.TupleTy:
+		return structs[kind.String()].Name
 	case abi.ArrayTy:
-		return fmt.Sprintf("[%d]", kind.Size) + bindTypeGo(*kind.Elem)
+		return fmt.Sprintf("[%d]", kind.Size) + bindTypeGo(*kind.Elem, structs)
 	case abi.SliceTy:
-		return "[]" + bindTypeGo(*kind.Elem)
+		return "[]" + bindTypeGo(*kind.Elem, structs)
 	default:
 		return bindBasicTypeGo(kind)
 	}
@@ -248,15 +270,10 @@ func bindBasicTypeJava(kind abi.Type) string {
 	}
 }
 
-// bindTypeJava converts a Solidity type to a Java one. Since there is no clear mapping
+// pluralizeJavaType explicitly converts multidimensional types to predefined
-// from all Solidity types to Java ones (e.g. uint17), those that cannot be exactly
+// type in go side.
-// mapped will use an upscaled type (e.g. BigDecimal).
+func pluralizeJavaType(typ string) string {
-func bindTypeJava(kind abi.Type) string {
+	switch typ {
-	switch kind.T {
-	case abi.ArrayTy, abi.SliceTy:
-		// Explicitly convert multidimensional types to predefined type in go side.
-		inner := bindTypeJava(*kind.Elem)
-		switch inner {
 	case "boolean":
 		return "Bools"
 	case "String":
@@ -268,7 +285,18 @@ func bindTypeJava(kind abi.Type) string {
 	case "BigInt":
 		return "BigInts"
 	}
-		return inner + "[]"
+	return typ + "[]"
+}
+
+// bindTypeJava converts a Solidity type to a Java one. Since there is no clear mapping
+// from all Solidity types to Java ones (e.g. uint17), those that cannot be exactly
+// mapped will use an upscaled type (e.g. BigDecimal).
+func bindTypeJava(kind abi.Type, structs map[string]*tmplStruct) string {
+	switch kind.T {
+	case abi.TupleTy:
+		return structs[kind.String()].Name
+	case abi.ArrayTy, abi.SliceTy:
+		return pluralizeJavaType(bindTypeJava(*kind.Elem, structs))
 	default:
 		return bindBasicTypeJava(kind)
 	}
@@ -276,15 +304,15 @@ func bindTypeJava(kind abi.Type) string {
 
 // bindTopicType is a set of type binders that convert Solidity types to some
 // supported programming language topic types.
-var bindTopicType = map[Lang]func(kind abi.Type) string{
+var bindTopicType = map[Lang]func(kind abi.Type, structs map[string]*tmplStruct) string{
 	LangGo:   bindTopicTypeGo,
 	LangJava: bindTopicTypeJava,
 }
 
 // bindTypeGo converts a Solidity topic type to a Go one. It is almost the same
 // funcionality as for simple types, but dynamic types get converted to hashes.
-func bindTopicTypeGo(kind abi.Type) string {
+func bindTopicTypeGo(kind abi.Type, structs map[string]*tmplStruct) string {
-	bound := bindTypeGo(kind)
+	bound := bindTypeGo(kind, structs)
 	if bound == "string" || bound == "[]byte" {
 		bound = "common.Hash"
 	}
@@ -293,14 +321,77 @@ func bindTopicTypeGo(kind abi.Type) string {
 
 // bindTypeGo converts a Solidity topic type to a Java one. It is almost the same
 // funcionality as for simple types, but dynamic types get converted to hashes.
-func bindTopicTypeJava(kind abi.Type) string {
+func bindTopicTypeJava(kind abi.Type, structs map[string]*tmplStruct) string {
-	bound := bindTypeJava(kind)
+	bound := bindTypeJava(kind, structs)
 	if bound == "String" || bound == "byte[]" {
 		bound = "Hash"
 	}
 	return bound
 }
 
+// bindStructType is a set of type binders that convert Solidity tuple types to some supported
+// programming language struct definition.
+var bindStructType = map[Lang]func(kind abi.Type, structs map[string]*tmplStruct) string{
+	LangGo:   bindStructTypeGo,
+	LangJava: bindStructTypeJava,
+}
+
+// bindStructTypeGo converts a Solidity tuple type to a Go one and records the mapping
+// in the given map.
+// Notably, this function will resolve and record nested struct recursively.
+func bindStructTypeGo(kind abi.Type, structs map[string]*tmplStruct) string {
+	switch kind.T {
+	case abi.TupleTy:
+		if s, exist := structs[kind.String()]; exist {
+			return s.Name
+		}
+		var fields []*tmplField
+		for i, elem := range kind.TupleElems {
+			field := bindStructTypeGo(*elem, structs)
+			fields = append(fields, &tmplField{Type: field, Name: capitalise(kind.TupleRawNames[i]), SolKind: *elem})
+		}
+		name := fmt.Sprintf("Struct%d", len(structs))
+		structs[kind.String()] = &tmplStruct{
+			Name:   name,
+			Fields: fields,
+		}
+		return name
+	case abi.ArrayTy:
+		return fmt.Sprintf("[%d]", kind.Size) + bindStructTypeGo(*kind.Elem, structs)
+	case abi.SliceTy:
+		return "[]" + bindStructTypeGo(*kind.Elem, structs)
+	default:
+		return bindBasicTypeGo(kind)
+	}
+}
+
+// bindStructTypeJava converts a Solidity tuple type to a Java one and records the mapping
+// in the given map.
+// Notably, this function will resolve and record nested struct recursively.
+func bindStructTypeJava(kind abi.Type, structs map[string]*tmplStruct) string {
+	switch kind.T {
+	case abi.TupleTy:
+		if s, exist := structs[kind.String()]; exist {
+			return s.Name
+		}
+		var fields []*tmplField
+		for i, elem := range kind.TupleElems {
+			field := bindStructTypeJava(*elem, structs)
+			fields = append(fields, &tmplField{Type: field, Name: decapitalise(kind.TupleRawNames[i]), SolKind: *elem})
+		}
+		name := fmt.Sprintf("Class%d", len(structs))
+		structs[kind.String()] = &tmplStruct{
+			Name:   name,
+			Fields: fields,
+		}
+		return name
+	case abi.ArrayTy, abi.SliceTy:
+		return pluralizeJavaType(bindStructTypeJava(*kind.Elem, structs))
+	default:
+		return bindBasicTypeJava(kind)
+	}
+}
+
 // namedType is a set of functions that transform language specific types to
 // named versions that my be used inside method names.
 var namedType = map[Lang]func(string, abi.Type) string{
@@ -378,3 +469,63 @@ func structured(args abi.Arguments) bool {
 	}
 	return true
 }
+
+// resolveArgName converts a raw argument representation into a user friendly format.
+func resolveArgName(arg abi.Argument, structs map[string]*tmplStruct) string {
+	var (
+		prefix   string
+		embedded string
+		typ      = &arg.Type
+	)
+loop:
+	for {
+		switch typ.T {
+		case abi.SliceTy:
+			prefix += "[]"
+		case abi.ArrayTy:
+			prefix += fmt.Sprintf("[%d]", typ.Size)
+		default:
+			embedded = typ.String()
+			break loop
+		}
+		typ = typ.Elem
+	}
+	if s, exist := structs[embedded]; exist {
+		return prefix + s.Name
+	} else {
+		return arg.Type.String()
+	}
+}
+
+// formatMethod transforms raw method representation into a user friendly one.
+func formatMethod(method abi.Method, structs map[string]*tmplStruct) string {
+	inputs := make([]string, len(method.Inputs))
+	for i, input := range method.Inputs {
+		inputs[i] = fmt.Sprintf("%v %v", resolveArgName(input, structs), input.Name)
+	}
+	outputs := make([]string, len(method.Outputs))
+	for i, output := range method.Outputs {
+		outputs[i] = resolveArgName(output, structs)
+		if len(output.Name) > 0 {
+			outputs[i] += fmt.Sprintf(" %v", output.Name)
+		}
+	}
+	constant := ""
+	if method.Const {
+		constant = "constant "
+	}
+	return fmt.Sprintf("function %v(%v) %sreturns(%v)", method.Name, strings.Join(inputs, ", "), constant, strings.Join(outputs, ", "))
+}
+
+// formatEvent transforms raw event representation into a user friendly one.
+func formatEvent(event abi.Event, structs map[string]*tmplStruct) string {
+	inputs := make([]string, len(event.Inputs))
+	for i, input := range event.Inputs {
+		if input.Indexed {
+			inputs[i] = fmt.Sprintf("%v indexed %v", resolveArgName(input, structs), input.Name)
+		} else {
+			inputs[i] = fmt.Sprintf("%v %v", resolveArgName(input, structs), input.Name)
+		}
+	}
+	return fmt.Sprintf("event %v(%v)", event.Name, strings.Join(inputs, ", "))
+}

accounts/abi/bind/template.go

@@ -34,6 +34,7 @@ type tmplContract struct {
 	Calls       map[string]*tmplMethod // Contract calls that only read state data
 	Transacts   map[string]*tmplMethod // Contract calls that write state data
 	Events      map[string]*tmplEvent  // Contract events accessors
+	Structs     map[string]*tmplStruct // Contract struct type definitions
 }
 
 // tmplMethod is a wrapper around an abi.Method that contains a few preprocessed
@@ -50,6 +51,21 @@ type tmplEvent struct {
 	Normalized abi.Event // Normalized version of the parsed fields
 }
 
+// tmplField is a wrapper around a struct field with binding language
+// struct type definition and relative filed name.
+type tmplField struct {
+	Type    string   // Field type representation depends on target binding language
+	Name    string   // Field name converted from the raw user-defined field name
+	SolKind abi.Type // Raw abi type information
+}
+
+// tmplStruct is a wrapper around an abi.tuple contains a auto-generated
+// struct name.
+type tmplStruct struct {
+	Name   string       // Auto-generated struct name(We can't obtain the raw struct name through abi)
+	Fields []*tmplField // Struct fields definition depends on the binding language.
+}
+
 // tmplSource is language to template mapping containing all the supported
 // programming languages the package can generate to.
 var tmplSource = map[Lang]string{
@@ -90,6 +106,7 @@ var (
 )
 
 {{range $contract := .Contracts}}
+	{{$structs := $contract.Structs}}
 	// {{.Type}}ABI is the input ABI used to generate the binding from.
 	const {{.Type}}ABI = "{{.InputABI}}"
 
@@ -107,7 +124,7 @@ var (
 		const {{.Type}}Bin = ` + "`" + `{{.InputBin}}` + "`" + `
 
 		// Deploy{{.Type}} deploys a new Ethereum contract, binding an instance of {{.Type}} to it.
-		func Deploy{{.Type}}(auth *bind.TransactOpts, backend bind.ContractBackend {{range .Constructor.Inputs}}, {{.Name}} {{bindtype .Type}}{{end}}) (common.Address, *types.Transaction, *{{.Type}}, error) {
+		func Deploy{{.Type}}(auth *bind.TransactOpts, backend bind.ContractBackend {{range .Constructor.Inputs}}, {{.Name}} {{bindtype .Type $structs}}{{end}}) (common.Address, *types.Transaction, *{{.Type}}, error) {
 		  parsed, err := abi.JSON(strings.NewReader({{.Type}}ABI))
 		  if err != nil {
 		    return common.Address{}, nil, nil, err
@@ -262,16 +279,24 @@ var (
 		return _{{$contract.Type}}.Contract.contract.Transact(opts, method, params...)
 	}
 
+	{{range .Structs}}
+		// {{.Name}} is an auto generated low-level Go binding around an user-defined struct.
+		type {{.Name}} struct {
+		{{range $field := .Fields}}
+		{{$field.Name}} {{$field.Type}}{{end}}
+		}
+	{{end}}
+
 	{{range .Calls}}
 		// {{.Normalized.Name}} is a free data retrieval call binding the contract method 0x{{printf "%x" .Original.Id}}.
 		//
-		// Solidity: {{.Original.String}}
+		// Solidity: {{formatmethod .Original $structs}}
-		func (_{{$contract.Type}} *{{$contract.Type}}Caller) {{.Normalized.Name}}(opts *bind.CallOpts {{range .Normalized.Inputs}}, {{.Name}} {{bindtype .Type}} {{end}}) ({{if .Structured}}struct{ {{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type}};{{end}} },{{else}}{{range .Normalized.Outputs}}{{bindtype .Type}},{{end}}{{end}} error) {
+		func (_{{$contract.Type}} *{{$contract.Type}}Caller) {{.Normalized.Name}}(opts *bind.CallOpts {{range .Normalized.Inputs}}, {{.Name}} {{bindtype .Type $structs}} {{end}}) ({{if .Structured}}struct{ {{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type $structs}};{{end}} },{{else}}{{range .Normalized.Outputs}}{{bindtype .Type $structs}},{{end}}{{end}} error) {
 			{{if .Structured}}ret := new(struct{
-				{{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type}}
+				{{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type $structs}}
 				{{end}}
 			}){{else}}var (
-				{{range $i, $_ := .Normalized.Outputs}}ret{{$i}} = new({{bindtype .Type}})
+				{{range $i, $_ := .Normalized.Outputs}}ret{{$i}} = new({{bindtype .Type $structs}})
 				{{end}}
 			){{end}}
 			out := {{if .Structured}}ret{{else}}{{if eq (len .Normalized.Outputs) 1}}ret0{{else}}&[]interface{}{
@@ -284,15 +309,15 @@ var (
 
 		// {{.Normalized.Name}} is a free data retrieval call binding the contract method 0x{{printf "%x" .Original.Id}}.
 		//
-		// Solidity: {{.Original.String}}
+		// Solidity: {{formatmethod .Original $structs}}
-		func (_{{$contract.Type}} *{{$contract.Type}}Session) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type}} {{end}}) ({{if .Structured}}struct{ {{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type}};{{end}} }, {{else}} {{range .Normalized.Outputs}}{{bindtype .Type}},{{end}} {{end}} error) {
+		func (_{{$contract.Type}} *{{$contract.Type}}Session) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type $structs}} {{end}}) ({{if .Structured}}struct{ {{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type $structs}};{{end}} }, {{else}} {{range .Normalized.Outputs}}{{bindtype .Type $structs}},{{end}} {{end}} error) {
 		  return _{{$contract.Type}}.Contract.{{.Normalized.Name}}(&_{{$contract.Type}}.CallOpts {{range .Normalized.Inputs}}, {{.Name}}{{end}})
 		}
 
 		// {{.Normalized.Name}} is a free data retrieval call binding the contract method 0x{{printf "%x" .Original.Id}}.
 		//
-		// Solidity: {{.Original.String}}
+		// Solidity: {{formatmethod .Original $structs}}
-		func (_{{$contract.Type}} *{{$contract.Type}}CallerSession) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type}} {{end}}) ({{if .Structured}}struct{ {{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type}};{{end}} }, {{else}} {{range .Normalized.Outputs}}{{bindtype .Type}},{{end}} {{end}} error) {
+		func (_{{$contract.Type}} *{{$contract.Type}}CallerSession) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type $structs}} {{end}}) ({{if .Structured}}struct{ {{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type $structs}};{{end}} }, {{else}} {{range .Normalized.Outputs}}{{bindtype .Type $structs}},{{end}} {{end}} error) {
 		  return _{{$contract.Type}}.Contract.{{.Normalized.Name}}(&_{{$contract.Type}}.CallOpts {{range .Normalized.Inputs}}, {{.Name}}{{end}})
 		}
 	{{end}}
@@ -300,22 +325,22 @@ var (
 	{{range .Transacts}}
 		// {{.Normalized.Name}} is a paid mutator transaction binding the contract method 0x{{printf "%x" .Original.Id}}.
 		//
-		// Solidity: {{.Original.String}}
+		// Solidity: {{formatmethod .Original $structs}}
-		func (_{{$contract.Type}} *{{$contract.Type}}Transactor) {{.Normalized.Name}}(opts *bind.TransactOpts {{range .Normalized.Inputs}}, {{.Name}} {{bindtype .Type}} {{end}}) (*types.Transaction, error) {
+		func (_{{$contract.Type}} *{{$contract.Type}}Transactor) {{.Normalized.Name}}(opts *bind.TransactOpts {{range .Normalized.Inputs}}, {{.Name}} {{bindtype .Type $structs}} {{end}}) (*types.Transaction, error) {
 			return _{{$contract.Type}}.contract.Transact(opts, "{{.Original.Name}}" {{range .Normalized.Inputs}}, {{.Name}}{{end}})
 		}
 
 		// {{.Normalized.Name}} is a paid mutator transaction binding the contract method 0x{{printf "%x" .Original.Id}}.
 		//
-		// Solidity: {{.Original.String}}
+		// Solidity: {{formatmethod .Original $structs}}
-		func (_{{$contract.Type}} *{{$contract.Type}}Session) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type}} {{end}}) (*types.Transaction, error) {
+		func (_{{$contract.Type}} *{{$contract.Type}}Session) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type $structs}} {{end}}) (*types.Transaction, error) {
 		  return _{{$contract.Type}}.Contract.{{.Normalized.Name}}(&_{{$contract.Type}}.TransactOpts {{range $i, $_ := .Normalized.Inputs}}, {{.Name}}{{end}})
 		}
 
 		// {{.Normalized.Name}} is a paid mutator transaction binding the contract method 0x{{printf "%x" .Original.Id}}.
 		//
-		// Solidity: {{.Original.String}}
+		// Solidity: {{formatmethod .Original $structs}}
-		func (_{{$contract.Type}} *{{$contract.Type}}TransactorSession) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type}} {{end}}) (*types.Transaction, error) {
+		func (_{{$contract.Type}} *{{$contract.Type}}TransactorSession) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type $structs}} {{end}}) (*types.Transaction, error) {
 		  return _{{$contract.Type}}.Contract.{{.Normalized.Name}}(&_{{$contract.Type}}.TransactOpts {{range $i, $_ := .Normalized.Inputs}}, {{.Name}}{{end}})
 		}
 	{{end}}
@@ -387,14 +412,14 @@ var (
 
 		// {{$contract.Type}}{{.Normalized.Name}} represents a {{.Normalized.Name}} event raised by the {{$contract.Type}} contract.
 		type {{$contract.Type}}{{.Normalized.Name}} struct { {{range .Normalized.Inputs}}
-			{{capitalise .Name}} {{if .Indexed}}{{bindtopictype .Type}}{{else}}{{bindtype .Type}}{{end}}; {{end}}
+			{{capitalise .Name}} {{if .Indexed}}{{bindtopictype .Type $structs}}{{else}}{{bindtype .Type $structs}}{{end}}; {{end}}
 			Raw types.Log // Blockchain specific contextual infos
 		}
 
 		// Filter{{.Normalized.Name}} is a free log retrieval operation binding the contract event 0x{{printf "%x" .Original.Id}}.
 		//
-		// Solidity: {{.Original.String}}
+		// Solidity: {{formatevent .Original $structs}}
- 		func (_{{$contract.Type}} *{{$contract.Type}}Filterer) Filter{{.Normalized.Name}}(opts *bind.FilterOpts{{range .Normalized.Inputs}}{{if .Indexed}}, {{.Name}} []{{bindtype .Type}}{{end}}{{end}}) (*{{$contract.Type}}{{.Normalized.Name}}Iterator, error) {
+ 		func (_{{$contract.Type}} *{{$contract.Type}}Filterer) Filter{{.Normalized.Name}}(opts *bind.FilterOpts{{range .Normalized.Inputs}}{{if .Indexed}}, {{.Name}} []{{bindtype .Type $structs}}{{end}}{{end}}) (*{{$contract.Type}}{{.Normalized.Name}}Iterator, error) {
 			{{range .Normalized.Inputs}}
 			{{if .Indexed}}var {{.Name}}Rule []interface{}
 			for _, {{.Name}}Item := range {{.Name}} {
@@ -410,8 +435,8 @@ var (
 
 		// Watch{{.Normalized.Name}} is a free log subscription operation binding the contract event 0x{{printf "%x" .Original.Id}}.
 		//
-		// Solidity: {{.Original.String}}
+		// Solidity: {{formatevent .Original $structs}}
-		func (_{{$contract.Type}} *{{$contract.Type}}Filterer) Watch{{.Normalized.Name}}(opts *bind.WatchOpts, sink chan<- *{{$contract.Type}}{{.Normalized.Name}}{{range .Normalized.Inputs}}{{if .Indexed}}, {{.Name}} []{{bindtype .Type}}{{end}}{{end}}) (event.Subscription, error) {
+		func (_{{$contract.Type}} *{{$contract.Type}}Filterer) Watch{{.Normalized.Name}}(opts *bind.WatchOpts, sink chan<- *{{$contract.Type}}{{.Normalized.Name}}{{range .Normalized.Inputs}}{{if .Indexed}}, {{.Name}} []{{bindtype .Type $structs}}{{end}}{{end}}) (event.Subscription, error) {
 			{{range .Normalized.Inputs}}
 			{{if .Indexed}}var {{.Name}}Rule []interface{}
 			for _, {{.Name}}Item := range {{.Name}} {
@@ -477,6 +502,7 @@ import org.ethereum.geth.*;
 import java.util.*;
 
 {{range $contract := .Contracts}}
+{{$structs := $contract.Structs}}
 public class {{.Type}} {
 	// ABI is the input ABI used to generate the binding from.
 	public final static String ABI = "{{.InputABI}}";
@@ -496,9 +522,9 @@ public class {{.Type}} {
 	public final static String BYTECODE = "0x{{.InputBin}}";
 
 	// deploy deploys a new Ethereum contract, binding an instance of {{.Type}} to it.
-	public static {{.Type}} deploy(TransactOpts auth, EthereumClient client{{range .Constructor.Inputs}}, {{bindtype .Type}} {{.Name}}{{end}}) throws Exception {
+	public static {{.Type}} deploy(TransactOpts auth, EthereumClient client{{range .Constructor.Inputs}}, {{bindtype .Type $structs}} {{.Name}}{{end}}) throws Exception {
 		Interfaces args = Geth.newInterfaces({{(len .Constructor.Inputs)}});
-		{{range $index, $element := .Constructor.Inputs}}Interface arg{{$index}} = Geth.newInterface();arg{{$index}}.set{{namedtype (bindtype .Type) .Type}}({{.Name}});args.set({{$index}},arg{{$index}});
+		{{range $index, $element := .Constructor.Inputs}}Interface arg{{$index}} = Geth.newInterface();arg{{$index}}.set{{namedtype (bindtype .Type $structs) .Type}}({{.Name}});args.set({{$index}},arg{{$index}});
 		{{end}}
 		return new {{.Type}}(Geth.deployContract(auth, ABI, Geth.decodeFromHex(BYTECODE), client, args));
 	}
@@ -529,7 +555,7 @@ public class {{.Type}} {
 	{{if gt (len .Normalized.Outputs) 1}}
 	// {{capitalise .Normalized.Name}}Results is the output of a call to {{.Normalized.Name}}.
 	public class {{capitalise .Normalized.Name}}Results {
-		{{range $index, $item := .Normalized.Outputs}}public {{bindtype .Type}} {{if ne .Name ""}}{{.Name}}{{else}}Return{{$index}}{{end}};
+		{{range $index, $item := .Normalized.Outputs}}public {{bindtype .Type $structs}} {{if ne .Name ""}}{{.Name}}{{else}}Return{{$index}}{{end}};
 		{{end}}
 	}
 	{{end}}
@@ -537,13 +563,13 @@ public class {{.Type}} {
 	// {{.Normalized.Name}} is a free data retrieval call binding the contract method 0x{{printf "%x" .Original.Id}}.
 	//
 	// Solidity: {{.Original.String}}
-	public {{if gt (len .Normalized.Outputs) 1}}{{capitalise .Normalized.Name}}Results{{else}}{{range .Normalized.Outputs}}{{bindtype .Type}}{{end}}{{end}} {{.Normalized.Name}}(CallOpts opts{{range .Normalized.Inputs}}, {{bindtype .Type}} {{.Name}}{{end}}) throws Exception {
+	public {{if gt (len .Normalized.Outputs) 1}}{{capitalise .Normalized.Name}}Results{{else}}{{range .Normalized.Outputs}}{{bindtype .Type $structs}}{{end}}{{end}} {{.Normalized.Name}}(CallOpts opts{{range .Normalized.Inputs}}, {{bindtype .Type $structs}} {{.Name}}{{end}}) throws Exception {
 		Interfaces args = Geth.newInterfaces({{(len .Normalized.Inputs)}});
-		{{range $index, $item := .Normalized.Inputs}}Interface arg{{$index}} = Geth.newInterface();arg{{$index}}.set{{namedtype (bindtype .Type) .Type}}({{.Name}});args.set({{$index}},arg{{$index}});
+		{{range $index, $item := .Normalized.Inputs}}Interface arg{{$index}} = Geth.newInterface();arg{{$index}}.set{{namedtype (bindtype .Type $structs) .Type}}({{.Name}});args.set({{$index}},arg{{$index}});
 		{{end}}
 
 		Interfaces results = Geth.newInterfaces({{(len .Normalized.Outputs)}});
-		{{range $index, $item := .Normalized.Outputs}}Interface result{{$index}} = Geth.newInterface(); result{{$index}}.setDefault{{namedtype (bindtype .Type) .Type}}(); results.set({{$index}}, result{{$index}});
+		{{range $index, $item := .Normalized.Outputs}}Interface result{{$index}} = Geth.newInterface(); result{{$index}}.setDefault{{namedtype (bindtype .Type $structs) .Type}}(); results.set({{$index}}, result{{$index}});
 		{{end}}
 
 		if (opts == null) {
@@ -552,10 +578,10 @@ public class {{.Type}} {
 		this.Contract.call(opts, results, "{{.Original.Name}}", args);
 		{{if gt (len .Normalized.Outputs) 1}}
 			{{capitalise .Normalized.Name}}Results result = new {{capitalise .Normalized.Name}}Results();
-			{{range $index, $item := .Normalized.Outputs}}result.{{if ne .Name ""}}{{.Name}}{{else}}Return{{$index}}{{end}} = results.get({{$index}}).get{{namedtype (bindtype .Type) .Type}}();
+			{{range $index, $item := .Normalized.Outputs}}result.{{if ne .Name ""}}{{.Name}}{{else}}Return{{$index}}{{end}} = results.get({{$index}}).get{{namedtype (bindtype .Type $structs) .Type}}();
 			{{end}}
 			return result;
-		{{else}}{{range .Normalized.Outputs}}return results.get(0).get{{namedtype (bindtype .Type) .Type}}();{{end}}
+		{{else}}{{range .Normalized.Outputs}}return results.get(0).get{{namedtype (bindtype .Type $structs) .Type}}();{{end}}
 		{{end}}
 	}
 	{{end}}
@@ -564,9 +590,9 @@ public class {{.Type}} {
 	// {{.Normalized.Name}} is a paid mutator transaction binding the contract method 0x{{printf "%x" .Original.Id}}.
 	//
 	// Solidity: {{.Original.String}}
-	public Transaction {{.Normalized.Name}}(TransactOpts opts{{range .Normalized.Inputs}}, {{bindtype .Type}} {{.Name}}{{end}}) throws Exception {
+	public Transaction {{.Normalized.Name}}(TransactOpts opts{{range .Normalized.Inputs}}, {{bindtype .Type $structs}} {{.Name}}{{end}}) throws Exception {
 		Interfaces args = Geth.newInterfaces({{(len .Normalized.Inputs)}});
-		{{range $index, $item := .Normalized.Inputs}}Interface arg{{$index}} = Geth.newInterface();arg{{$index}}.set{{namedtype (bindtype .Type) .Type}}({{.Name}});args.set({{$index}},arg{{$index}});
+		{{range $index, $item := .Normalized.Inputs}}Interface arg{{$index}} = Geth.newInterface();arg{{$index}}.set{{namedtype (bindtype .Type $structs) .Type}}({{.Name}});args.set({{$index}},arg{{$index}});
 		{{end}}
 		return this.Contract.transact(opts, "{{.Original.Name}}"	, args);
 	}

accounts/abi/method_test.go

@@ -25,7 +25,11 @@ const methoddata = `
 [
 	{"type": "function", "name": "balance", "constant": true },
 	{"type": "function", "name": "send", "constant": false, "inputs": [{ "name": "amount", "type": "uint256" }]},
-	{ "type" : "function", "name" : "transfer", "constant" : false, "inputs" : [ { "name" : "from", "type" : "address" }, { "name" : "to", "type" : "address" }, { "name" : "value", "type" : "uint256" } ], "outputs" : [ { "name" : "success", "type" : "bool" } ]  }
+	{"type": "function", "name": "transfer", "constant": false, "inputs": [{"name": "from", "type": "address"}, {"name": "to", "type": "address"}, {"name": "value", "type": "uint256"}], "outputs": [{"name": "success", "type": "bool"}]},
+	{"constant":false,"inputs":[{"components":[{"name":"x","type":"uint256"},{"name":"y","type":"uint256"}],"name":"a","type":"tuple"}],"name":"tuple","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},
+	{"constant":false,"inputs":[{"components":[{"name":"x","type":"uint256"},{"name":"y","type":"uint256"}],"name":"a","type":"tuple[]"}],"name":"tupleSlice","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},
+	{"constant":false,"inputs":[{"components":[{"name":"x","type":"uint256"},{"name":"y","type":"uint256"}],"name":"a","type":"tuple[5]"}],"name":"tupleArray","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},
+	{"constant":false,"inputs":[{"components":[{"name":"x","type":"uint256"},{"name":"y","type":"uint256"}],"name":"a","type":"tuple[5][]"}],"name":"complexTuple","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}
 ]`
 
 func TestMethodString(t *testing.T) {
@@ -45,6 +49,22 @@ func TestMethodString(t *testing.T) {
 			method:      "transfer",
 			expectation: "function transfer(address from, address to, uint256 value) returns(bool success)",
 		},
+		{
+			method:      "tuple",
+			expectation: "function tuple((uint256,uint256) a) returns()",
+		},
+		{
+			method:      "tupleArray",
+			expectation: "function tupleArray((uint256,uint256)[5] a) returns()",
+		},
+		{
+			method:      "tupleSlice",
+			expectation: "function tupleSlice((uint256,uint256)[] a) returns()",
+		},
+		{
+			method:      "complexTuple",
+			expectation: "function complexTuple((uint256,uint256)[5][] a) returns()",
+		},
 	}
 
 	abi, err := JSON(strings.NewReader(methoddata))
@@ -59,3 +79,50 @@ func TestMethodString(t *testing.T) {
 		}
 	}
 }
+
+func TestMethodSig(t *testing.T) {
+	var cases = []struct {
+		method string
+		expect string
+	}{
+		{
+			method: "balance",
+			expect: "balance()",
+		},
+		{
+			method: "send",
+			expect: "send(uint256)",
+		},
+		{
+			method: "transfer",
+			expect: "transfer(address,address,uint256)",
+		},
+		{
+			method: "tuple",
+			expect: "tuple((uint256,uint256))",
+		},
+		{
+			method: "tupleArray",
+			expect: "tupleArray((uint256,uint256)[5])",
+		},
+		{
+			method: "tupleSlice",
+			expect: "tupleSlice((uint256,uint256)[])",
+		},
+		{
+			method: "complexTuple",
+			expect: "complexTuple((uint256,uint256)[5][])",
+		},
+	}
+	abi, err := JSON(strings.NewReader(methoddata))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	for _, test := range cases {
+		got := abi.Methods[test.method].Sig()
+		if got != test.expect {
+			t.Errorf("expected string to be %s, got %s", test.expect, got)
+		}
+	}
+}

accounts/abi/reflect.go

@@ -31,6 +31,14 @@ func indirect(v reflect.Value) reflect.Value {
 	return v
 }
 
+// indirectInterfaceOrPtr recursively dereferences the value until value is not interface.
+func indirectInterfaceOrPtr(v reflect.Value) reflect.Value {
+	if (v.Kind() == reflect.Interface || v.Kind() == reflect.Ptr) && v.Elem().IsValid() {
+		return indirect(v.Elem())
+	}
+	return v
+}
+
 // reflectIntKind returns the reflect using the given size and
 // unsignedness.
 func reflectIntKindAndType(unsigned bool, size int) (reflect.Kind, reflect.Type) {

accounts/abi/type.go

@@ -68,7 +68,6 @@ func NewType(t string, components []ArgumentMarshaling) (typ Type, err error) {
 	if strings.Count(t, "[") != strings.Count(t, "]") {
 		return Type{}, fmt.Errorf("invalid arg type in abi")
 	}
-
 	typ.stringKind = t
 
 	// if there are brackets, get ready to go into slice/array mode and
@@ -92,9 +91,7 @@ func NewType(t string, components []ArgumentMarshaling) (typ Type, err error) {
 			typ.Kind = reflect.Slice
 			typ.Elem = &embeddedType
 			typ.Type = reflect.SliceOf(embeddedType.Type)
-			if embeddedType.T == TupleTy {
 			typ.stringKind = embeddedType.stringKind + sliced
-			}
 		} else if len(intz) == 1 {
 			// is a array
 			typ.T = ArrayTy
@@ -105,9 +102,7 @@ func NewType(t string, components []ArgumentMarshaling) (typ Type, err error) {
 				return Type{}, fmt.Errorf("abi: error parsing variable size: %v", err)
 			}
 			typ.Type = reflect.ArrayOf(typ.Size, embeddedType.Type)
-			if embeddedType.T == TupleTy {
 			typ.stringKind = embeddedType.stringKind + sliced
-			}
 		} else {
 			return Type{}, fmt.Errorf("invalid formatting of array type")
 		}

accounts/abi/unpack_test.go

@@ -965,25 +965,21 @@ func TestUnpackTuple(t *testing.T) {
 	buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001")) // ret[a] = 1
 	buff.Write(common.Hex2Bytes("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff")) // ret[b] = -1
 
+	// If the result is single tuple, use struct as return value container directly.
 	v := struct {
-		Ret struct {
 		A *big.Int
 		B *big.Int
-		}
+	}{new(big.Int), new(big.Int)}
-	}{Ret: struct {
-		A *big.Int
-		B *big.Int
-	}{new(big.Int), new(big.Int)}}
 
 	err = abi.Unpack(&v, "tuple", buff.Bytes())
 	if err != nil {
 		t.Error(err)
 	} else {
-		if v.Ret.A.Cmp(big.NewInt(1)) != 0 {
+		if v.A.Cmp(big.NewInt(1)) != 0 {
-			t.Errorf("unexpected value unpacked: want %x, got %x", 1, v.Ret.A)
+			t.Errorf("unexpected value unpacked: want %x, got %x", 1, v.A)
 		}
-		if v.Ret.B.Cmp(big.NewInt(-1)) != 0 {
+		if v.B.Cmp(big.NewInt(-1)) != 0 {
-			t.Errorf("unexpected value unpacked: want %x, got %x", v.Ret.B, -1)
+			t.Errorf("unexpected value unpacked: want %x, got %x", v.B, -1)
 		}
 	}
 

cmd/abigen/main.go

@@ -69,6 +69,8 @@ func main() {
 		lang = bind.LangGo
 	case "java":
 		lang = bind.LangJava
+	case "objc":
+		lang = bind.LangObjC
 	default:
 		fmt.Printf("Unsupported destination language \"%s\" (--lang)\n", *langFlag)
 		os.Exit(-1)