5 func checkRecursive(contract *Contract) bool {
6 for _, clause := range contract.Clauses {
7 for _, stmt := range clause.statements {
8 if result := checkStatRecursive(stmt, contract.Name); result {
16 func checkStatRecursive(stmt statement, contractName string) bool {
17 switch s := stmt.(type) {
19 for _, trueStmt := range s.body.trueBody {
20 if result := checkStatRecursive(trueStmt, contractName); result {
25 for _, falseStmt := range s.body.falseBody {
26 if result := checkStatRecursive(falseStmt, contractName); result {
32 if c, ok := s.program.(*callExpr); ok {
33 if references(c.fn, contractName) {
42 func prohibitSigParams(contract *Contract) error {
43 for _, p := range contract.Params {
44 if p.Type == sigType {
45 return fmt.Errorf("contract parameter \"%s\" has type Signature, but contract parameters cannot have type Signature", p.Name)
51 func requireAllParamsUsedInClauses(params []*Param, clauses []*Clause) error {
52 for _, p := range params {
54 for _, c := range clauses {
55 err := requireAllParamsUsedInClause([]*Param{p}, c)
62 return fmt.Errorf("parameter \"%s\" is unused", p.Name)
68 func requireAllParamsUsedInClause(params []*Param, clause *Clause) error {
69 for _, p := range params {
71 for _, stmt := range clause.statements {
72 if used = checkParamUsedInStatement(p, stmt); used {
78 return fmt.Errorf("parameter \"%s\" is unused in clause \"%s\"", p.Name, clause.Name)
84 func checkParamUsedInStatement(param *Param, stmt statement) (used bool) {
85 switch s := stmt.(type) {
87 if used = references(s.condition, param.Name); used {
91 for _, st := range s.body.trueBody {
92 if used = checkParamUsedInStatement(param, st); used {
98 for _, st := range s.body.falseBody {
99 if used = checkParamUsedInStatement(param, st); used {
105 case *defineStatement:
106 used = references(s.expr, param.Name)
107 case *assignStatement:
108 used = references(s.expr, param.Name)
109 case *verifyStatement:
110 used = references(s.expr, param.Name)
112 used = references(s.lockedAmount, param.Name) || references(s.lockedAsset, param.Name) || references(s.program, param.Name)
113 case *unlockStatement:
114 used = references(s.unlockedAmount, param.Name) || references(s.unlockedAsset, param.Name)
120 func references(expr expression, name string) bool {
121 switch e := expr.(type) {
123 return references(e.left, name) || references(e.right, name)
125 return references(e.expr, name)
127 if references(e.fn, name) {
130 for _, a := range e.args {
131 if references(a, name) {
137 return string(e) == name
139 for _, elt := range []expression(e) {
140 if references(elt, name) {
149 func referencedBuiltin(expr expression) *builtin {
150 if v, ok := expr.(varRef); ok {
151 for _, b := range builtins {
152 if string(v) == b.name {
160 func assignIndexes(clause *Clause) error {
162 for i, stmt := range clause.statements {
163 if nextIndex = assignStatIndexes(stmt, nextIndex, i != len(clause.statements)-1); nextIndex < 0 {
164 return fmt.Errorf("Not support that the number of lock/unlock statement is not equal between ifbody and elsebody when the if-else is not the last statement in clause \"%s\"", clause.Name)
171 func assignStatIndexes(stat statement, nextIndex int64, nonFinalFlag bool) int64 {
172 switch stmt := stat.(type) {
174 trueIndex := nextIndex
175 falseIndex := nextIndex
176 for _, trueStmt := range stmt.body.trueBody {
177 trueIndex = assignStatIndexes(trueStmt, trueIndex, nonFinalFlag)
180 for _, falseStmt := range stmt.body.falseBody {
181 falseIndex = assignStatIndexes(falseStmt, falseIndex, nonFinalFlag)
184 if trueIndex != falseIndex && nonFinalFlag {
186 } else if trueIndex == falseIndex {
187 nextIndex = trueIndex
191 stmt.index = nextIndex
194 case *unlockStatement:
201 func typeCheckClause(contract *Contract, clause *Clause, env *environ) error {
202 for _, s := range clause.statements {
203 if err := typeCheckStatement(s, contract.Value, clause.Name, env); err != nil {
210 func typeCheckStatement(stat statement, contractValue ValueInfo, clauseName string, env *environ) error {
211 switch stmt := stat.(type) {
213 for _, trueStmt := range stmt.body.trueBody {
214 if err := typeCheckStatement(trueStmt, contractValue, clauseName, env); err != nil {
219 for _, falseStmt := range stmt.body.falseBody {
220 if err := typeCheckStatement(falseStmt, contractValue, clauseName, env); err != nil {
225 case *defineStatement:
226 if stmt.expr != nil && stmt.expr.typ(env) != stmt.variable.Type && !isHashSubtype(stmt.expr.typ(env)) {
227 return fmt.Errorf("expression in define statement in clause \"%s\" has type \"%s\", must be \"%s\"",
228 clauseName, stmt.expr.typ(env), stmt.variable.Type)
231 case *assignStatement:
232 if stmt.expr.typ(env) != stmt.variable.Type && !isHashSubtype(stmt.expr.typ(env)) {
233 return fmt.Errorf("expression in assign statement in clause \"%s\" has type \"%s\", must be \"%s\"",
234 clauseName, stmt.expr.typ(env), stmt.variable.Type)
237 case *verifyStatement:
238 if t := stmt.expr.typ(env); t != boolType {
239 return fmt.Errorf("expression in verify statement in clause \"%s\" has type \"%s\", must be Boolean", clauseName, t)
243 if t := stmt.lockedAmount.typ(env); !(t == intType || t == amountType) {
244 return fmt.Errorf("lockedAmount expression \"%s\" in lock statement in clause \"%s\" has type \"%s\", must be Integer", stmt.lockedAmount, clauseName, t)
246 if t := stmt.lockedAsset.typ(env); t != assetType {
247 return fmt.Errorf("lockedAsset expression \"%s\" in lock statement in clause \"%s\" has type \"%s\", must be Asset", stmt.lockedAsset, clauseName, t)
249 if t := stmt.program.typ(env); t != progType {
250 return fmt.Errorf("program in lock statement in clause \"%s\" has type \"%s\", must be Program", clauseName, t)
253 case *unlockStatement:
254 if t := stmt.unlockedAmount.typ(env); !(t == intType || t == amountType) {
255 return fmt.Errorf("unlockedAmount expression \"%s\" in unlock statement of clause \"%s\" has type \"%s\", must be Integer", stmt.unlockedAmount, clauseName, t)
257 if t := stmt.unlockedAsset.typ(env); t != assetType {
258 return fmt.Errorf("unlockedAsset expression \"%s\" in unlock statement of clause \"%s\" has type \"%s\", must be Asset", stmt.unlockedAsset, clauseName, t)
260 if stmt.unlockedAmount.String() != contractValue.Amount || stmt.unlockedAsset.String() != contractValue.Asset {
261 return fmt.Errorf("amount \"%s\" of asset \"%s\" expression in unlock statement of clause \"%s\" must be the contract valueAmount \"%s\" of valueAsset \"%s\"",
262 stmt.unlockedAmount.String(), stmt.unlockedAsset.String(), clauseName, contractValue.Amount, contractValue.Asset)