"fmt"
"io"
"io/ioutil"
- "strings"
chainjson "github.com/bytom/encoding/json"
"github.com/bytom/errors"
}
b := &builder{}
+ sequence := 0 // sequence is used to count the number of ifStatements
if len(contract.Clauses) == 1 {
- err = compileClause(b, stk, contract, env, contract.Clauses[0])
+ err = compileClause(b, stk, contract, env, contract.Clauses[0], &sequence)
if err != nil {
return err
}
stk = b.addDrop(stk)
}
- err = compileClause(b, stk, contract, env, clause)
+ err = compileClause(b, stk, contract, env, clause, &sequence)
if err != nil {
return errors.Wrapf(err, "compiling clause \"%s\"", clause.Name)
}
return nil
}
-func compileClause(b *builder, contractStk stack, contract *Contract, env *environ, clause *Clause) error {
+func compileClause(b *builder, contractStk stack, contract *Contract, env *environ, clause *Clause, sequence *int) error {
var err error
// copy env to leave outerEnv unchanged
return err
}
}
- assignIndexes(clause)
+
+ if err = assignIndexes(clause); err != nil {
+ return err
+ }
var stk stack
for _, p := range clause.Params {
// a count of the number of times each variable is referenced
counts := make(map[string]int)
for _, s := range clause.statements {
+ if stmt, ok := s.(*defineStatement); ok && stmt.expr == nil {
+ continue
+ }
+
s.countVarRefs(counts)
+ if stmt, ok := s.(*ifStatement); ok {
+ for _, trueStmt := range stmt.body.trueBody {
+ trueStmt.countVarRefs(counts)
+ }
+
+ for _, falseStmt := range stmt.body.falseBody {
+ falseStmt.countVarRefs(counts)
+ }
+ }
}
- for _, s := range clause.statements {
- switch stmt := s.(type) {
- case *verifyStatement:
- stk, err = compileExpr(b, stk, contract, clause, env, counts, stmt.expr)
- if err != nil {
- return errors.Wrapf(err, "in verify statement in clause \"%s\"", clause.Name)
- }
- stk = b.addVerify(stk)
-
- // special-case reporting of certain function calls
- if c, ok := stmt.expr.(*callExpr); ok && len(c.args) == 1 {
- if b := referencedBuiltin(c.fn); b != nil {
- switch b.name {
- case "below":
- clause.BlockHeight = append(clause.BlockHeight, c.args[0].String())
- case "above":
- clause.BlockHeight = append(clause.BlockHeight, c.args[0].String())
- }
+ for _, stat := range clause.statements {
+ if stk, err = compileStatement(b, stk, contract, env, clause, counts, stat, sequence); err != nil {
+ return err
+ }
+ }
+
+ err = requireAllValuesDisposedOnce(contract, clause)
+ if err != nil {
+ return err
+ }
+ err = typeCheckClause(contract, clause, env)
+ if err != nil {
+ return err
+ }
+ err = requireAllParamsUsedInClause(clause.Params, clause)
+ if err != nil {
+ return err
+ }
+
+ return nil
+}
+
+func compileStatement(b *builder, stk stack, contract *Contract, env *environ, clause *Clause, counts map[string]int, stat statement, sequence *int) (stack, error) {
+ var err error
+ switch stmt := stat.(type) {
+ case *ifStatement:
+ // sequence add 1 when the statement is ifStatement
+ *sequence++
+ strSequence := fmt.Sprintf("%d", *sequence)
+
+ // compile condition expression
+ stk, err = compileExpr(b, stk, contract, clause, env, counts, stmt.condition)
+ if err != nil {
+ return stk, errors.Wrapf(err, "in check condition of ifStatement in clause \"%s\"", clause.Name)
+ }
+
+ // jump to falseBody when condition is false, while the JUMPIF instruction will be run success when
+ // the value of dataStack is true, therefore add this check
+ conditionExpr := stk.str
+ stk = b.addBoolean(stk, false)
+ stk = b.addEqual(stk, fmt.Sprintf("(%s == false)", conditionExpr)) // stack: [... <condition_result == false>]
+
+ // add label
+ var label string
+ if len(stmt.body.falseBody) != 0 {
+ label = "else_" + strSequence
+ } else {
+ label = "endif_" + strSequence
+ }
+ stk = b.addJumpIf(stk, label)
+ b.addJumpTarget(stk, "if_"+strSequence)
+
+ // temporary store stack and counts for falseBody
+ condStk := stk
+ elseCounts := make(map[string]int)
+ for k, v := range counts {
+ elseCounts[k] = v
+ }
+
+ // compile trueBody statements
+ if len(stmt.body.trueBody) != 0 {
+ for _, st := range stmt.body.trueBody {
+ st.countVarRefs(counts)
+ }
+
+ // modify value amount because of using only once
+ if counts[contract.Value.Amount] > 1 {
+ counts[contract.Value.Amount] = 1
+ }
+
+ // modify value asset because of using only once
+ if counts[contract.Value.Asset] > 1 {
+ counts[contract.Value.Asset] = 1
+ }
+
+ for _, st := range stmt.body.trueBody {
+ if stk, err = compileStatement(b, stk, contract, env, clause, counts, st, sequence); err != nil {
+ return stk, err
}
}
+ }
+
+ // compile falseBody statements
+ if len(stmt.body.falseBody) != 0 {
+ counts := make(map[string]int)
+ for k, v := range elseCounts {
+ counts[k] = v
+ }
- case *lockStatement:
- // index
- stk = b.addInt64(stk, stmt.index)
+ for _, st := range stmt.body.falseBody {
+ st.countVarRefs(counts)
+ }
- // TODO: permit more complex expressions for locked,
- // like "lock x+y with foo" (?)
+ // modify value amount because of using only once
+ if counts[contract.Value.Amount] > 1 {
+ counts[contract.Value.Amount] = 1
+ }
- if stmt.lockedAmount.String() == contract.Value.Amount && stmt.lockedAsset.String() == contract.Value.Asset {
- stk = b.addAmount(stk, contract.Value.Amount)
- stk = b.addAsset(stk, contract.Value.Asset)
- } else {
- if strings.Contains(stmt.lockedAmount.String(), contract.Value.Amount) {
- stk = b.addAmount(stk, contract.Value.Amount)
+ // modify value asset because of using only once
+ if counts[contract.Value.Asset] > 1 {
+ counts[contract.Value.Asset] = 1
+ }
+
+ stk = condStk
+ b.addJump(stk, "endif_"+strSequence)
+ b.addJumpTarget(stk, "else_"+strSequence)
+
+ for _, st := range stmt.body.falseBody {
+ if stk, err = compileStatement(b, stk, contract, env, clause, counts, st, sequence); err != nil {
+ return stk, err
}
+ }
+ }
+ b.addJumpTarget(stk, "endif_"+strSequence)
+
+ case *defineStatement:
+ // add environ for define variable
+ if err = env.add(stmt.variable.Name, stmt.variable.Type, roleClauseVariable); err != nil {
+ return stk, err
+ }
- if strings.Contains(stmt.lockedAsset.String(), contract.Value.Asset) {
- stk = b.addAsset(stk, contract.Value.Asset)
+ // check whether the variable is used or not
+ if counts[stmt.variable.Name] == 0 {
+ return stk, fmt.Errorf("the defined variable \"%s\" is unused in clause \"%s\"", stmt.variable.Name, clause.Name)
+ }
+
+ if stmt.expr != nil {
+ // variable
+ stk, err = compileExpr(b, stk, contract, clause, env, counts, stmt.expr)
+ if err != nil {
+ return stk, errors.Wrapf(err, "in define statement in clause \"%s\"", clause.Name)
+ }
+
+ // modify stack name
+ stk.str = stmt.variable.Name
+ }
+
+ case *assignStatement:
+ // find variable from environ with roleClauseVariable
+ if entry := env.lookup(string(stmt.variable.Name)); entry != nil {
+ if entry.r != roleClauseVariable {
+ return stk, fmt.Errorf("the type of variable is not roleClauseVariable in assign statement in clause \"%s\"", clause.Name)
+ }
+ stmt.variable.Type = entry.t
+ } else {
+ return stk, fmt.Errorf("the variable \"%s\" is not defined before the assign statement in clause \"%s\"", stmt.variable.Name, clause.Name)
+ }
+
+ // temporary store the counts of defined variable
+ varCount := counts[stmt.variable.Name]
+
+ // calculate the counts of variable for assign statement
+ tmpCounts := make(map[string]int)
+ stmt.countVarRefs(tmpCounts)
+
+ // modify the map counts of defined variable to 1 and minus the number of defined variable
+ // when the assign expression contains the defined variable
+ if tmpCounts[stmt.variable.Name] > 0 {
+ counts[stmt.variable.Name] = 1
+ varCount -= tmpCounts[stmt.variable.Name]
+ } else {
+ depth := stk.find(stmt.variable.Name)
+ switch depth {
+ case 0:
+ break
+ case 1:
+ stk = b.addSwap(stk)
+ default:
+ stk = b.addRoll(stk, depth)
+ }
+ stk = b.addDrop(stk)
+ }
+
+ // variable
+ stk, err = compileExpr(b, stk, contract, clause, env, counts, stmt.expr)
+ if err != nil {
+ return stk, errors.Wrapf(err, "in define statement in clause \"%s\"", clause.Name)
+ }
+
+ // restore the defined variable counts
+ counts[stmt.variable.Name] = varCount
+
+ // modify stack name
+ stk.str = stmt.variable.Name
+
+ case *verifyStatement:
+ stk, err = compileExpr(b, stk, contract, clause, env, counts, stmt.expr)
+ if err != nil {
+ return stk, errors.Wrapf(err, "in verify statement in clause \"%s\"", clause.Name)
+ }
+ stk = b.addVerify(stk)
+
+ // special-case reporting of certain function calls
+ if c, ok := stmt.expr.(*callExpr); ok && len(c.args) == 1 {
+ if b := referencedBuiltin(c.fn); b != nil {
+ switch b.name {
+ case "below":
+ clause.BlockHeight = append(clause.BlockHeight, c.args[0].String())
+ case "above":
+ clause.BlockHeight = append(clause.BlockHeight, c.args[0].String())
}
+ }
+ }
+
+ case *lockStatement:
+ // index
+ stk = b.addInt64(stk, stmt.index)
+
+ // TODO: permit more complex expressions for locked,
+ // like "lock x+y with foo" (?)
- // amount
+ if stmt.lockedAmount.String() == contract.Value.Amount && stmt.lockedAsset.String() == contract.Value.Asset {
+ stk = b.addAmount(stk, contract.Value.Amount)
+ stk = b.addAsset(stk, contract.Value.Asset)
+ } else {
+ // calculate the counts of variable for lockStatement
+ lockCounts := make(map[string]int)
+ stmt.countVarRefs(lockCounts)
+
+ // amount
+ switch {
+ case stmt.lockedAmount.String() == contract.Value.Amount:
+ stk = b.addAmount(stk, contract.Value.Amount)
+ case stmt.lockedAmount.String() != contract.Value.Amount && lockCounts[contract.Value.Amount] > 0:
+ stk = b.addAmount(stk, contract.Value.Amount)
+ stk, err = compileExpr(b, stk, contract, clause, env, counts, stmt.lockedAmount)
+ if err != nil {
+ return stk, errors.Wrapf(err, "in lock statement in clause \"%s\"", clause.Name)
+ }
+ default:
stk, err = compileExpr(b, stk, contract, clause, env, counts, stmt.lockedAmount)
if err != nil {
- return errors.Wrapf(err, "in lock statement in clause \"%s\"", clause.Name)
+ return stk, errors.Wrapf(err, "in lock statement in clause \"%s\"", clause.Name)
}
+ }
- // asset
+ // asset
+ switch {
+ case stmt.lockedAsset.String() == contract.Value.Asset:
+ stk = b.addAsset(stk, contract.Value.Asset)
+ case stmt.lockedAsset.String() != contract.Value.Asset && lockCounts[contract.Value.Asset] > 0:
+ stk = b.addAsset(stk, contract.Value.Asset)
+ stk, err = compileExpr(b, stk, contract, clause, env, counts, stmt.lockedAsset)
+ if err != nil {
+ return stk, errors.Wrapf(err, "in lock statement in clause \"%s\"", clause.Name)
+ }
+ default:
stk, err = compileExpr(b, stk, contract, clause, env, counts, stmt.lockedAsset)
if err != nil {
- return errors.Wrapf(err, "in lock statement in clause \"%s\"", clause.Name)
+ return stk, errors.Wrapf(err, "in lock statement in clause \"%s\"", clause.Name)
}
}
+ }
- // version
- stk = b.addInt64(stk, 1)
+ // version
+ stk = b.addInt64(stk, 1)
- // prog
- stk, err = compileExpr(b, stk, contract, clause, env, counts, stmt.program)
- if err != nil {
- return errors.Wrapf(err, "in lock statement in clause \"%s\"", clause.Name)
- }
+ // prog
+ stk, err = compileExpr(b, stk, contract, clause, env, counts, stmt.program)
+ if err != nil {
+ return stk, errors.Wrapf(err, "in lock statement in clause \"%s\"", clause.Name)
+ }
- stk = b.addCheckOutput(stk, fmt.Sprintf("checkOutput(%s, %s, %s)",
- stmt.lockedAmount.String(), stmt.lockedAsset.String(), stmt.program))
- stk = b.addVerify(stk)
+ stk = b.addCheckOutput(stk, fmt.Sprintf("checkOutput(%s, %s, %s)",
+ stmt.lockedAmount.String(), stmt.lockedAsset.String(), stmt.program))
+ stk = b.addVerify(stk)
- case *unlockStatement:
- if len(clause.statements) == 1 {
- // This is the only statement in the clause, make sure TRUE is
- // on the stack.
- stk = b.addBoolean(stk, true)
- }
+ case *unlockStatement:
+ if len(clause.statements) == 1 {
+ // This is the only statement in the clause, make sure TRUE is
+ // on the stack.
+ stk = b.addBoolean(stk, true)
}
}
- err = requireAllValuesDisposedOnce(contract, clause)
- if err != nil {
- return err
- }
- err = typeCheckClause(contract, clause, env)
- if err != nil {
- return err
- }
- err = requireAllParamsUsedInClause(clause.Params, clause)
- if err != nil {
- return err
- }
-
- return nil
+ return stk, nil
}
func compileExpr(b *builder, stk stack, contract *Contract, clause *Clause, env *environ, counts map[string]int, expr expression) (stack, error) {
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