neo-go/pkg/compiler/debug.go

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package compiler
import (
"encoding/json"
"errors"
"fmt"
"go/ast"
"go/types"
"strconv"
"strings"
"unicode"
"unicode/utf8"
"github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/smartcontract/manifest"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
)
// DebugInfo represents smart-contract debug information.
type DebugInfo struct {
MainPkg string `json:"-"`
Documents []string `json:"documents"`
Methods []MethodDebugInfo `json:"methods"`
Events []EventDebugInfo `json:"events"`
// EmittedEvents contains events occurring in code.
EmittedEvents map[string][][]string `json:"-"`
// InvokedContracts contains foreign contract invocations.
InvokedContracts map[util.Uint160][]string `json:"-"`
// StaticVariables contains list of static variable names and types.
StaticVariables []string `json:"static-variables"`
}
// MethodDebugInfo represents smart-contract's method debug information.
type MethodDebugInfo struct {
// ID is the actual name of the method.
ID string `json:"id"`
// Name is the name of the method with the first letter in a lowercase
// together with the namespace it belongs to. We need to keep the first letter
// lowercased to match manifest standards.
Name DebugMethodName `json:"name"`
// IsExported defines whether method is exported.
IsExported bool `json:"-"`
// IsFunction defines whether method has no receiver.
IsFunction bool `json:"-"`
// Range is the range of smart-contract's opcodes corresponding to the method.
Range DebugRange `json:"range"`
// Parameters is a list of method's parameters.
Parameters []DebugParam `json:"params"`
// ReturnType is method's return type.
ReturnType string `json:"return"`
// ReturnTypeSC is return type to use in manifest.
ReturnTypeSC smartcontract.ParamType `json:"-"`
Variables []string `json:"variables"`
// SeqPoints is a map between source lines and byte-code instruction offsets.
SeqPoints []DebugSeqPoint `json:"sequence-points"`
}
// DebugMethodName is a combination of a namespace and name.
type DebugMethodName struct {
Namespace string
Name string
}
// EventDebugInfo represents smart-contract's event debug information.
type EventDebugInfo struct {
ID string `json:"id"`
// Name is a human-readable event name in a format "{namespace},{name}".
Name string `json:"name"`
Parameters []DebugParam `json:"params"`
}
// DebugSeqPoint represents break-point for debugger.
type DebugSeqPoint struct {
// Opcode is an opcode's address.
Opcode int
// Document is an index of file where sequence point occurs.
Document int
// StartLine is the first line of the break-pointed statement.
StartLine int
// StartCol is the first column of the break-pointed statement.
StartCol int
// EndLine is the last line of the break-pointed statement.
EndLine int
// EndCol is the last column of the break-pointed statement.
EndCol int
}
// DebugRange represents method's section in bytecode.
type DebugRange struct {
Start uint16
End uint16
}
// DebugParam represents variables's name and type.
type DebugParam struct {
Name string `json:"name"`
Type string `json:"type"`
TypeSC smartcontract.ParamType `json:"-"`
}
func (c *codegen) saveSequencePoint(n ast.Node) {
name := "init"
if c.scope != nil {
name = c.scope.name
}
fset := c.buildInfo.program.Fset
start := fset.Position(n.Pos())
end := fset.Position(n.End())
c.sequencePoints[name] = append(c.sequencePoints[name], DebugSeqPoint{
Opcode: c.prog.Len(),
Document: c.docIndex[start.Filename],
StartLine: start.Line,
StartCol: start.Offset,
EndLine: end.Line,
EndCol: end.Offset,
})
}
func (c *codegen) emitDebugInfo(contract []byte) *DebugInfo {
d := &DebugInfo{
MainPkg: c.mainPkg.Pkg.Name(),
Events: []EventDebugInfo{},
Documents: c.documents,
StaticVariables: c.staticVariables,
}
if c.initEndOffset > 0 {
d.Methods = append(d.Methods, MethodDebugInfo{
ID: manifest.MethodInit,
Name: DebugMethodName{
Name: manifest.MethodInit,
Namespace: c.mainPkg.Pkg.Name(),
},
IsExported: true,
IsFunction: true,
Range: DebugRange{
Start: 0,
End: uint16(c.initEndOffset),
},
ReturnType: "Void",
ReturnTypeSC: smartcontract.VoidType,
SeqPoints: c.sequencePoints["init"],
Variables: c.initVariables,
})
}
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if c.deployEndOffset >= 0 {
d.Methods = append(d.Methods, MethodDebugInfo{
ID: manifest.MethodDeploy,
Name: DebugMethodName{
Name: manifest.MethodDeploy,
Namespace: c.mainPkg.Pkg.Name(),
},
IsExported: true,
IsFunction: true,
Range: DebugRange{
Start: uint16(c.initEndOffset + 1),
End: uint16(c.deployEndOffset),
},
Parameters: []DebugParam{
{
Name: "data",
Type: "Any",
TypeSC: smartcontract.AnyType,
},
{
Name: "isUpdate",
Type: "Boolean",
TypeSC: smartcontract.BoolType,
},
},
ReturnType: "Void",
ReturnTypeSC: smartcontract.VoidType,
SeqPoints: c.sequencePoints[manifest.MethodDeploy],
Variables: c.deployVariables,
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})
}
for name, scope := range c.funcs {
m := c.methodInfoFromScope(name, scope)
if m.Range.Start == m.Range.End {
continue
}
d.Methods = append(d.Methods, *m)
}
d.EmittedEvents = c.emittedEvents
d.InvokedContracts = c.invokedContracts
return d
}
func (c *codegen) registerDebugVariable(name string, expr ast.Expr) {
_, vt := c.scAndVMTypeFromExpr(expr)
if c.scope == nil {
c.staticVariables = append(c.staticVariables, name+","+vt.String())
return
}
c.scope.variables = append(c.scope.variables, name+","+vt.String())
}
func (c *codegen) methodInfoFromScope(name string, scope *funcScope) *MethodDebugInfo {
ps := scope.decl.Type.Params
params := make([]DebugParam, 0, ps.NumFields())
for i := range ps.List {
for j := range ps.List[i].Names {
st, vt := c.scAndVMTypeFromExpr(ps.List[i].Type)
params = append(params, DebugParam{
Name: ps.List[i].Names[j].Name,
Type: vt.String(),
TypeSC: st,
})
}
}
ss := strings.Split(name, ".")
name = ss[len(ss)-1]
r, n := utf8.DecodeRuneInString(name)
st, vt := c.scAndVMReturnTypeFromScope(scope)
return &MethodDebugInfo{
ID: name,
Name: DebugMethodName{
Name: string(unicode.ToLower(r)) + name[n:],
Namespace: scope.pkg.Name(),
},
IsExported: scope.decl.Name.IsExported(),
IsFunction: scope.decl.Recv == nil,
Range: scope.rng,
Parameters: params,
ReturnType: vt,
ReturnTypeSC: st,
SeqPoints: c.sequencePoints[name],
Variables: scope.variables,
}
}
func (c *codegen) scAndVMReturnTypeFromScope(scope *funcScope) (smartcontract.ParamType, string) {
results := scope.decl.Type.Results
switch results.NumFields() {
case 0:
return smartcontract.VoidType, "Void"
case 1:
st, vt := c.scAndVMTypeFromExpr(results.List[0].Type)
return st, vt.String()
default:
// multiple return values are not supported in debugger
return smartcontract.AnyType, "Any"
}
}
func scAndVMInteropTypeFromExpr(named *types.Named) (smartcontract.ParamType, stackitem.Type) {
name := named.Obj().Name()
pkg := named.Obj().Pkg().Name()
switch pkg {
case "ledger", "contract":
return smartcontract.ArrayType, stackitem.ArrayT // Block, Transaction, Contract
case "interop":
if name != "Interface" {
switch name {
case "Hash160":
return smartcontract.Hash160Type, stackitem.ByteArrayT
case "Hash256":
return smartcontract.Hash256Type, stackitem.ByteArrayT
case "PublicKey":
return smartcontract.PublicKeyType, stackitem.ByteArrayT
case "Signature":
return smartcontract.SignatureType, stackitem.ByteArrayT
}
}
}
return smartcontract.InteropInterfaceType, stackitem.InteropT
}
func (c *codegen) scAndVMTypeFromExpr(typ ast.Expr) (smartcontract.ParamType, stackitem.Type) {
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t := c.typeOf(typ)
if c.typeOf(typ) == nil {
return smartcontract.AnyType, stackitem.AnyT
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}
if named, ok := t.(*types.Named); ok {
if isInteropPath(named.String()) {
return scAndVMInteropTypeFromExpr(named)
}
}
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switch t := t.Underlying().(type) {
case *types.Basic:
info := t.Info()
switch {
case info&types.IsInteger != 0:
return smartcontract.IntegerType, stackitem.IntegerT
case info&types.IsBoolean != 0:
return smartcontract.BoolType, stackitem.BooleanT
case info&types.IsString != 0:
return smartcontract.StringType, stackitem.ByteArrayT
default:
return smartcontract.AnyType, stackitem.AnyT
}
case *types.Map:
return smartcontract.MapType, stackitem.MapT
case *types.Struct:
return smartcontract.ArrayType, stackitem.StructT
case *types.Slice:
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if isByte(t.Elem()) {
return smartcontract.ByteArrayType, stackitem.ByteArrayT
}
return smartcontract.ArrayType, stackitem.ArrayT
default:
return smartcontract.AnyType, stackitem.AnyT
}
}
// MarshalJSON implements json.Marshaler interface.
func (d *DebugRange) MarshalJSON() ([]byte, error) {
return []byte(`"` + strconv.FormatUint(uint64(d.Start), 10) + `-` +
strconv.FormatUint(uint64(d.End), 10) + `"`), nil
}
// UnmarshalJSON implements json.Unmarshaler interface.
func (d *DebugRange) UnmarshalJSON(data []byte) error {
startS, endS, err := parsePairJSON(data, "-")
if err != nil {
return err
}
start, err := strconv.ParseUint(startS, 10, 16)
if err != nil {
return err
}
end, err := strconv.ParseUint(endS, 10, 16)
if err != nil {
return err
}
d.Start = uint16(start)
d.End = uint16(end)
return nil
}
// MarshalJSON implements json.Marshaler interface.
func (d *DebugParam) MarshalJSON() ([]byte, error) {
return []byte(`"` + d.Name + `,` + d.Type + `"`), nil
}
// UnmarshalJSON implements json.Unmarshaler interface.
func (d *DebugParam) UnmarshalJSON(data []byte) error {
startS, endS, err := parsePairJSON(data, ",")
if err != nil {
return err
}
d.Name = startS
d.Type = endS
return nil
}
// ToManifestParameter converts DebugParam to manifest.Parameter.
func (d *DebugParam) ToManifestParameter() manifest.Parameter {
return manifest.Parameter{
Name: d.Name,
Type: d.TypeSC,
}
}
// ToManifestMethod converts MethodDebugInfo to manifest.Method.
func (m *MethodDebugInfo) ToManifestMethod() manifest.Method {
var (
result manifest.Method
)
parameters := make([]manifest.Parameter, len(m.Parameters))
for i, p := range m.Parameters {
parameters[i] = p.ToManifestParameter()
}
result.Name = m.Name.Name
result.Offset = int(m.Range.Start)
result.Parameters = parameters
result.ReturnType = m.ReturnTypeSC
return result
}
// MarshalJSON implements json.Marshaler interface.
func (d *DebugMethodName) MarshalJSON() ([]byte, error) {
return []byte(`"` + d.Namespace + `,` + d.Name + `"`), nil
}
// UnmarshalJSON implements json.Unmarshaler interface.
func (d *DebugMethodName) UnmarshalJSON(data []byte) error {
startS, endS, err := parsePairJSON(data, ",")
if err != nil {
return err
}
d.Namespace = startS
d.Name = endS
return nil
}
// MarshalJSON implements json.Marshaler interface.
func (d *DebugSeqPoint) MarshalJSON() ([]byte, error) {
s := fmt.Sprintf("%d[%d]%d:%d-%d:%d", d.Opcode, d.Document,
d.StartLine, d.StartCol, d.EndLine, d.EndCol)
return []byte(`"` + s + `"`), nil
}
// UnmarshalJSON implements json.Unmarshaler interface.
func (d *DebugSeqPoint) UnmarshalJSON(data []byte) error {
_, err := fmt.Sscanf(string(data), `"%d[%d]%d:%d-%d:%d"`,
&d.Opcode, &d.Document, &d.StartLine, &d.StartCol, &d.EndLine, &d.EndCol)
return err
}
func parsePairJSON(data []byte, sep string) (string, string, error) {
var s string
if err := json.Unmarshal(data, &s); err != nil {
return "", "", err
}
ss := strings.SplitN(s, sep, 2)
if len(ss) != 2 {
return "", "", errors.New("invalid range format")
}
return ss[0], ss[1], nil
}
// ConvertToManifest converts contract to the manifest.Manifest struct for debugger.
// Note: manifest is taken from the external source, however it can be generated ad-hoc. See #1038.
func (di *DebugInfo) ConvertToManifest(o *Options) (*manifest.Manifest, error) {
methods := make([]manifest.Method, 0)
for _, method := range di.Methods {
if method.IsExported && method.IsFunction && method.Name.Namespace == di.MainPkg {
mMethod := method.ToManifestMethod()
for i := range o.SafeMethods {
if mMethod.Name == o.SafeMethods[i] {
mMethod.Safe = true
break
}
}
methods = append(methods, mMethod)
}
}
result := manifest.NewManifest(o.Name)
if o.ContractSupportedStandards != nil {
result.SupportedStandards = o.ContractSupportedStandards
}
result.ABI = manifest.ABI{
Methods: methods,
Events: o.ContractEvents,
}
if result.ABI.Events == nil {
result.ABI.Events = make([]manifest.Event, 0)
}
result.Permissions = o.Permissions
for name, emitName := range o.Overloads {
m := result.ABI.GetMethod(name, -1)
if m == nil {
return nil, fmt.Errorf("overload for method %s was provided but it wasn't found", name)
}
if result.ABI.GetMethod(emitName, -1) == nil {
return nil, fmt.Errorf("overload with target method %s was provided but it wasn't found", emitName)
}
realM := result.ABI.GetMethod(emitName, len(m.Parameters))
if realM != nil {
return nil, fmt.Errorf("conflict overload for %s: "+
"multiple methods with the same number of parameters", name)
}
m.Name = emitName
}
return result, nil
}