--- /dev/null
+package compiler
+
+import "fmt"
+
+func checkRecursive(contract *Contract) bool {
+ for _, clause := range contract.Clauses {
+ for _, stmt := range clause.statements {
+ if result := checkStatRecursive(stmt, contract.Name); result {
+ return true
+ }
+ }
+ }
+ return false
+}
+
+func checkStatRecursive(stmt statement, contractName string) bool {
+ switch s := stmt.(type) {
+ case *ifStatement:
+ for _, trueStmt := range s.body.trueBody {
+ if result := checkStatRecursive(trueStmt, contractName); result {
+ return true
+ }
+ }
+
+ for _, falseStmt := range s.body.falseBody {
+ if result := checkStatRecursive(falseStmt, contractName); result {
+ return true
+ }
+ }
+
+ case *lockStatement:
+ if c, ok := s.program.(*callExpr); ok {
+ if references(c.fn, contractName) {
+ return true
+ }
+ }
+ }
+
+ return false
+}
+
+func prohibitSigParams(contract *Contract) error {
+ for _, p := range contract.Params {
+ if p.Type == sigType {
+ return fmt.Errorf("contract parameter \"%s\" has type Signature, but contract parameters cannot have type Signature", p.Name)
+ }
+ }
+ return nil
+}
+
+func requireAllParamsUsedInClauses(params []*Param, clauses []*Clause) error {
+ for _, p := range params {
+ used := false
+ for _, c := range clauses {
+ err := requireAllParamsUsedInClause([]*Param{p}, c)
+ if err == nil {
+ used = true
+ break
+ }
+ }
+
+ if !used {
+ return fmt.Errorf("parameter \"%s\" is unused", p.Name)
+ }
+ }
+ return nil
+}
+
+func requireAllParamsUsedInClause(params []*Param, clause *Clause) error {
+ for _, p := range params {
+ used := false
+ for _, stmt := range clause.statements {
+ if used = checkParamUsedInStatement(p, stmt); used {
+ break
+ }
+ }
+
+ if !used {
+ return fmt.Errorf("parameter \"%s\" is unused in clause \"%s\"", p.Name, clause.Name)
+ }
+ }
+ return nil
+}
+
+func checkParamUsedInStatement(param *Param, stmt statement) (used bool) {
+ switch s := stmt.(type) {
+ case *ifStatement:
+ if used = references(s.condition, param.Name); used {
+ return used
+ }
+
+ for _, st := range s.body.trueBody {
+ if used = checkParamUsedInStatement(param, st); used {
+ break
+ }
+ }
+
+ if !used {
+ for _, st := range s.body.falseBody {
+ if used = checkParamUsedInStatement(param, st); used {
+ break
+ }
+ }
+ }
+
+ case *defineStatement:
+ used = references(s.expr, param.Name)
+ case *assignStatement:
+ used = references(s.expr, param.Name)
+ case *verifyStatement:
+ used = references(s.expr, param.Name)
+ case *lockStatement:
+ used = references(s.lockedAmount, param.Name) || references(s.lockedAsset, param.Name) || references(s.program, param.Name)
+ case *unlockStatement:
+ used = references(s.unlockedAmount, param.Name) || references(s.unlockedAsset, param.Name)
+ }
+
+ return used
+}
+
+func references(expr expression, name string) bool {
+ switch e := expr.(type) {
+ case *binaryExpr:
+ return references(e.left, name) || references(e.right, name)
+ case *unaryExpr:
+ return references(e.expr, name)
+ case *callExpr:
+ if references(e.fn, name) {
+ return true
+ }
+ for _, a := range e.args {
+ if references(a, name) {
+ return true
+ }
+ }
+ return false
+ case varRef:
+ return string(e) == name
+ case listExpr:
+ for _, elt := range []expression(e) {
+ if references(elt, name) {
+ return true
+ }
+ }
+ return false
+ }
+ return false
+}
+
+func referencedBuiltin(expr expression) *builtin {
+ if v, ok := expr.(varRef); ok {
+ for _, b := range builtins {
+ if string(v) == b.name {
+ return &b
+ }
+ }
+ }
+ return nil
+}
+
+func assignIndexes(clause *Clause) error {
+ var nextIndex int64
+ for i, stmt := range clause.statements {
+ if nextIndex = assignStatIndexes(stmt, nextIndex, i != len(clause.statements)-1); nextIndex < 0 {
+ 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)
+ }
+ }
+
+ return nil
+}
+
+func assignStatIndexes(stat statement, nextIndex int64, nonFinalFlag bool) int64 {
+ switch stmt := stat.(type) {
+ case *ifStatement:
+ trueIndex := nextIndex
+ falseIndex := nextIndex
+ for _, trueStmt := range stmt.body.trueBody {
+ trueIndex = assignStatIndexes(trueStmt, trueIndex, nonFinalFlag)
+ }
+
+ for _, falseStmt := range stmt.body.falseBody {
+ falseIndex = assignStatIndexes(falseStmt, falseIndex, nonFinalFlag)
+ }
+
+ if trueIndex != falseIndex && nonFinalFlag {
+ return -1
+ } else if trueIndex == falseIndex {
+ nextIndex = trueIndex
+ }
+
+ case *lockStatement:
+ stmt.index = nextIndex
+ nextIndex++
+
+ case *unlockStatement:
+ nextIndex++
+ }
+
+ return nextIndex
+}
+
+func typeCheckClause(contract *Contract, clause *Clause, env *environ) error {
+ for _, s := range clause.statements {
+ if err := typeCheckStatement(s, contract.Value, clause.Name, env); err != nil {
+ return err
+ }
+ }
+ return nil
+}
+
+func typeCheckStatement(stat statement, contractValue ValueInfo, clauseName string, env *environ) error {
+ switch stmt := stat.(type) {
+ case *ifStatement:
+ for _, trueStmt := range stmt.body.trueBody {
+ if err := typeCheckStatement(trueStmt, contractValue, clauseName, env); err != nil {
+ return err
+ }
+ }
+
+ for _, falseStmt := range stmt.body.falseBody {
+ if err := typeCheckStatement(falseStmt, contractValue, clauseName, env); err != nil {
+ return err
+ }
+ }
+
+ case *defineStatement:
+ if stmt.expr != nil && stmt.expr.typ(env) != stmt.variable.Type && !isHashSubtype(stmt.expr.typ(env)) {
+ return fmt.Errorf("expression in define statement in clause \"%s\" has type \"%s\", must be \"%s\"",
+ clauseName, stmt.expr.typ(env), stmt.variable.Type)
+ }
+
+ case *assignStatement:
+ if stmt.expr.typ(env) != stmt.variable.Type && !isHashSubtype(stmt.expr.typ(env)) {
+ return fmt.Errorf("expression in assign statement in clause \"%s\" has type \"%s\", must be \"%s\"",
+ clauseName, stmt.expr.typ(env), stmt.variable.Type)
+ }
+
+ case *verifyStatement:
+ if t := stmt.expr.typ(env); t != boolType {
+ return fmt.Errorf("expression in verify statement in clause \"%s\" has type \"%s\", must be Boolean", clauseName, t)
+ }
+
+ case *lockStatement:
+ if t := stmt.lockedAmount.typ(env); !(t == intType || t == amountType) {
+ return fmt.Errorf("lockedAmount expression \"%s\" in lock statement in clause \"%s\" has type \"%s\", must be Integer", stmt.lockedAmount, clauseName, t)
+ }
+ if t := stmt.lockedAsset.typ(env); t != assetType {
+ return fmt.Errorf("lockedAsset expression \"%s\" in lock statement in clause \"%s\" has type \"%s\", must be Asset", stmt.lockedAsset, clauseName, t)
+ }
+ if t := stmt.program.typ(env); t != progType {
+ return fmt.Errorf("program in lock statement in clause \"%s\" has type \"%s\", must be Program", clauseName, t)
+ }
+
+ case *unlockStatement:
+ if t := stmt.unlockedAmount.typ(env); !(t == intType || t == amountType) {
+ return fmt.Errorf("unlockedAmount expression \"%s\" in unlock statement of clause \"%s\" has type \"%s\", must be Integer", stmt.unlockedAmount, clauseName, t)
+ }
+ if t := stmt.unlockedAsset.typ(env); t != assetType {
+ return fmt.Errorf("unlockedAsset expression \"%s\" in unlock statement of clause \"%s\" has type \"%s\", must be Asset", stmt.unlockedAsset, clauseName, t)
+ }
+ if stmt.unlockedAmount.String() != contractValue.Amount || stmt.unlockedAsset.String() != contractValue.Asset {
+ return fmt.Errorf("amount \"%s\" of asset \"%s\" expression in unlock statement of clause \"%s\" must be the contract valueAmount \"%s\" of valueAsset \"%s\"",
+ stmt.unlockedAmount.String(), stmt.unlockedAsset.String(), clauseName, contractValue.Amount, contractValue.Asset)
+ }
+ }
+
+ return nil
+}
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