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piped.go
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piped.go
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package solver
import (
"fmt"
"io"
"log"
"os/exec"
"github.com/bpowers/go-smt"
)
func isSuccess(sexp smt.Sexp) bool {
return smt.IsSymbol(sexp, "success")
}
func NewPipedSolver(exe string, args ...string) (smt.Solver, error) {
cmd := exec.Command(exe, args...)
stdin, err := cmd.StdinPipe()
if err != nil {
return nil, fmt.Errorf("StdinPipe: %s", err)
}
stdout, err := cmd.StdoutPipe()
if err != nil {
return nil, fmt.Errorf("StdoutPipe: %s", err)
}
if err = cmd.Start(); err != nil {
return nil, fmt.Errorf("Run: %s", err)
}
s := &solver{
cmd: cmd,
stdin: stdin,
stdoutCloser: stdout,
results: smt.NewParser(stdout),
}
r, err := s.Command(&smt.SList{[]smt.Sexp{
&smt.SSymbol{"set-option"},
&smt.SKeyword{"print-success"},
&smt.SSymbol{"true"}}})
if err != nil {
s.Close()
return nil, fmt.Errorf("print-success: %s", err)
}
if !isSuccess(r) {
s.Close()
return nil, fmt.Errorf("print-success(%#v): %s", r, err)
}
return s, nil
}
type solver struct {
cmd *exec.Cmd
stdin io.WriteCloser
stdoutCloser io.Closer
results *smt.Parser
}
func (s *solver) Command(sexp smt.Sexp) (smt.Sexp, error) {
str := sexp.String()
n, err := s.stdin.Write([]byte(str))
if n != len(str) {
return nil, fmt.Errorf("stdin.Write: short (%d < %d)", n, len(str))
}
if err != nil {
return nil, fmt.Errorf("stdin.Write: %s", err)
}
result, err := s.results.Read()
if err != nil {
return nil, fmt.Errorf("Parser.Read: %s", err)
}
return result, nil
}
func (s *solver) Close() {
}
func (s *solver) DeclareConst(id string, sort smt.Sort) error {
r, err := s.Command(&smt.SList{[]smt.Sexp{
&smt.SSymbol{"declare-const"},
&smt.SSymbol{id},
smt.SortToSexp(sort)}})
if err != nil {
return fmt.Errorf("Command: %s", err)
}
if !isSuccess(r) {
return fmt.Errorf("Command not success: %s", r)
}
return nil
}
func (s *solver) Assert(t smt.Term) error {
r, err := s.Command(&smt.SList{[]smt.Sexp{
&smt.SSymbol{"assert"},
smt.TermToSexp(t)}})
if err != nil {
return fmt.Errorf("Command: %s", err)
}
if !isSuccess(r) {
return fmt.Errorf("Command not success: %s", r)
}
return nil
}
func (s *solver) CheckSat() (smt.Satisfiable, error) {
r, err := s.Command(&smt.SList{[]smt.Sexp{
&smt.SSymbol{"check-sat"}}})
if err != nil {
return smt.Unknown, fmt.Errorf("Command: %s", err)
}
switch {
case smt.IsSymbol(r, "sat"):
return smt.Sat, nil
case smt.IsSymbol(r, "unsat"):
return smt.Unsat, nil
case smt.IsSymbol(r, "unknown"):
return smt.Unknown, nil
default:
return smt.Unknown, fmt.Errorf("unexpected (check-sat): %s", r)
}
}
func readModel(sexps []smt.Sexp) (map[string]smt.Term, error) {
terms := make(map[string]smt.Term)
for _, sexp := range sexps {
switch app := sexp.(type) {
case *smt.SList:
if len(app.List) < 5 {
log.Printf("readModel: unexpected short sexp")
continue
}
if !smt.IsSymbol(app.List[0], "define-fun") {
log.Printf("readModel: unexpected symbol: %s", app.List[0])
continue
}
name, ok := app.List[1].(*smt.SSymbol)
if !ok {
log.Printf("readModel: var name not a symbol: %s", app.List[1])
continue
}
if slist, ok := app.List[2].(*smt.SList); !ok || len(slist.List) != 0 {
log.Printf("readModel: expected empty list: %s", app.List[2])
continue
}
if !smt.IsSymbol(app.List[3], "Int") {
log.Printf("readModel: expected Int sort, not %s", app.List[3])
}
t, err := smt.SexpToTerm(app.List[4])
if err != nil {
log.Printf("couldn't parse sexp: %s", err)
}
terms[name.Symbol] = t
default:
return nil, fmt.Errorf("expected model list, got %s", app)
}
}
return terms, nil
}
func (s *solver) GetModel() (map[string]smt.Term, error) {
r, err := s.Command(&smt.SList{[]smt.Sexp{
&smt.SSymbol{"get-model"}}})
if err != nil {
return nil, fmt.Errorf("Command: %s", err)
}
switch app := r.(type) {
case *smt.SList:
if len(app.List) == 0 {
return nil, fmt.Errorf("expected model, got empty slist")
}
if !smt.IsSymbol(app.List[0], "model") {
return nil, fmt.Errorf("expected model, got2 %s", app)
}
return readModel(app.List[1:])
default:
return nil, fmt.Errorf("expected model, got %s", r)
}
}
func (s *solver) Push() {
r, err := s.Command(&smt.SList{[]smt.Sexp{
&smt.SSymbol{"push"}}})
if err != nil {
panic(fmt.Sprintf("Command: %s", err))
}
if !isSuccess(r) {
panic(fmt.Sprintf("Command not success: %s", r))
}
}
func (s *solver) Pop() error {
r, err := s.Command(&smt.SList{[]smt.Sexp{
&smt.SSymbol{"pop"}}})
if err != nil {
return fmt.Errorf("Command: %s", err)
}
if !isSuccess(r) {
return fmt.Errorf("Command not success: %s", r)
}
return nil
}