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cvc4_stubs.cpp
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cvc4_stubs.cpp
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/* OCaml bindings for CVC4
Copyright 2013 Christoph Sticksel
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/* These are the stubs for the functions exported to OCaml.
We have three types: cvc4_solver, cvc4_type and cvc4_expr. The last
two types manage their memory and delete the allocated memory when
the values become garbage collected. A value of cvc4_solver will
leave the allocated memory behind when it is garbage collected,
there is currently no function to delete its memory.
TODO: How to hash a type? There is no getId method as for expressions.
*/
extern "C" {
#include <caml/mlvalues.h>
#include <caml/alloc.h>
#include <caml/memory.h>
#include <caml/custom.h>
#include <caml/fail.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
}
#include <cvc4/cvc4.h>
// #define DEBUG
/* Positions of pointers in cvc4_solver abstract datatype fields */
#define em_field 0
#define smt_field 1
#define stack_level_field 2
#define symtab_field 3
/* Define lifted booleans as OCaml integers */
#define Val_l_True Val_int(0)
#define Val_l_False Val_int(1)
#define Val_l_Undef Val_int(2)
/* Values for type cvc4_sat_result */
#define Val_UNSAT Val_int(0)
#define Val_SAT Val_int(1)
#define Val_SAT_UNKNOWN Val_int(2)
/* Values for type cvc4_validity_result */
#define Val_INVALID Val_int(0)
#define Val_VALID Val_int(1)
#define Val_VALIDITY_UNKNOWN Val_int(2)
using namespace CVC4;
/* Macro to get the expression stored in the data field of a custom block */
#define cvc4_expr_val(v) (*(Expr**) Data_custom_val(v))
/* Macro to get the type stored in the data field of a custom block */
#define cvc4_type_val(v) (*(Type**) Data_custom_val(v))
/* Finalize an expression when it is garbage collected by OCaml */
void custom_finalize_cvc4_expr(value expr_in) {
/* Get the pointer to the expression from the data part of our custom block */
Expr* expr = cvc4_expr_val(expr_in);
#ifdef DEBUG
std::cerr << "Deleting " << *expr << std::endl;
#endif
/* Delete the expression */
delete expr;
}
/* Finalize a type when it is garbage collected by OCaml */
void custom_finalize_cvc4_type(value type_in) {
/* Get the pointer to the type from the data part of our custom block */
Type* type = cvc4_type_val(type_in);
#ifdef DEBUG
std::cerr << "Deleting " << *type << std::endl;
#endif
/* Delete the type */
delete type;
}
/* Comparison function for expression in custom block */
int custom_compare_cvc4_expr(value expr1_in, value expr2_in) {
/* Get first expresssion */
Expr* expr1 = cvc4_expr_val(expr1_in);
/* Get second expresssion */
Expr* expr2 = cvc4_expr_val(expr2_in);
try {
/* First expression is greater? */
if (*expr1 > *expr2) {
/* Return 1 */
return 1;
/* Second expression is greater? */
} else if (*expr1 < *expr2) {
/* Return -1 */
return -1;
/* Expressions are equal */
} else {
/* Return 0 */
return 0;
}
} catch(Exception& e) {
/* Throw OCaml exception */
caml_failwith(e.what());
}
}
/* Comparison function for type in custom block */
int custom_compare_cvc4_type(value type1_in, value type2_in) {
/* Get first type */
Type* type1 = cvc4_type_val(type1_in);
/* Get second type */
Type* type2 = cvc4_type_val(type2_in);
try {
/* First type is greater? */
if (*type1 > *type2) {
/* Return 1 */
return 1;
/* Second type is greater? */
} else if (*type1 < *type2) {
/* Return -1 */
return -1;
/* Types are equal */
} else {
/* Return 0 */
return 0;
}
} catch(Exception& e) {
/* Throw OCaml exception */
caml_failwith(e.what());
}
}
/* Hash function for expression in custom block */
long custom_hash_cvc4_expr(value expr_in) {
/* Get expresssion */
Expr* expr = cvc4_expr_val(expr_in);
try {
/* Get ID of expression */
long res = expr->getId();
/* Return ID as hash */
return(res);
} catch(Exception& e) {
/* Throw OCaml exception */
caml_failwith(e.what());
}
}
/* Custom block with finalization, comparison and hash function for expression */
static struct custom_operations expr_ops = {
identifier: "CVC4::Expr",
finalize: custom_finalize_cvc4_expr,
compare: custom_compare_cvc4_expr,
hash: custom_hash_cvc4_expr,
serialize: custom_serialize_default,
deserialize: custom_deserialize_default
};
/* Custom block with finalization, comparison and hash function for type */
static struct custom_operations type_ops = {
identifier: "CVC4::Type",
finalize: custom_finalize_cvc4_type,
compare: custom_compare_cvc4_type,
hash: custom_hash_default, /* TODO: How to hash a type? */
serialize: custom_serialize_default,
deserialize: custom_deserialize_default
};
/* Copy a CVC4 expression into an OCaml value stored as a custom block */
value copy_cvc4_expr(Expr& expr) {
/* Allocate for expression
We should not use CAMLlocal here, this is only valid outside of
nested blocks. Therefore we put the CAMLlocal macro at the
beginning of the calling function and pass it as a parameter. */
value expr_val = caml_alloc_custom(&expr_ops, sizeof(Expr*), 0, 1);
/* Get a copy of the expression that we can delete when we want to */
Expr* my_expr = new Expr(expr);
/* Set pointer to our expression into the data field of our custom block */
cvc4_expr_val(expr_val) = my_expr;
/* Return expression */
return expr_val;
}
/* Copy a CVC4 type into an OCaml value stored as a custom block */
value copy_cvc4_type(Type& type) {
/* Allocate for type
We should not use CAMLlocal here, this is only valid outside of
nested blocks. Therefore we put the CAMLlocal macro at the
beginning of the calling function and pass it as a parameter. */
value type_val = caml_alloc_custom(&type_ops, sizeof(Type*), 0, 1);
/* Get a copy of the type that we can delete when we want to */
Type* my_type = new Type(type);
/* Set pointer to our type into the data field of our custom block */
cvc4_type_val(type_val) = my_type;
/* Return expression */
return type_val;
}
/* Create and return a CVC4 solver instance
external cvc4_create_smt_engine : bool -> cvc4_solver = "cvc4_create_smt_engine"
The solver is created in the C++ heap, OCaml gets only a pointer in
an Abstract_tag. No finalization is done when the OCaml value
becomes garbage collected.
Every solver instance has its own expression manager that is
created here. Since the expression manager contains the options, we
do not share it between different instances.
*/
extern "C" CAMLprim value cvc4_create_smt_engine(value models_in, value rlimit_in)
{
#ifdef DEBUG
std::cerr << "cvc4_create_smt_engine" << std::endl;
#endif
/* Declare OCaml values */
CAMLparam1 (models_in);
CAMLlocal1 (res);
/* Create new expression manager */
ExprManager* em = new ExprManager();
/* Create new CVC4 instance */
SmtEngine* smt = new SmtEngine(em);
/* Create a symbol table */
SymbolTable* symtab = new SymbolTable();
try {
/* Enable incremental solving */
smt->setOption("incremental", SExpr("true"));
/* Enable or disable models */
if (Bool_val(models_in)) {
smt->setOption("produce-models", SExpr("true"));
} else {
smt->setOption("produce-models", SExpr("false"));
}
/* Set rlimit if greater than zero */
if (Int_val(rlimit_in) > 0) {
smt->setResourceLimit(Int_val(rlimit_in));
}
/* Output in SMTLIB2 format */
// em->setOutputLanguage(language::output::LANG_SMTLIB_V2);
/* Set logic */
smt->setLogic("QF_UF");
/* Allocate abstract datatype with four fields for CVC4 instance */
res = caml_alloc(4, Abstract_tag);
/* First field is pointer to expression manager */
Store_field(res, em_field, (value) em);
/* Second field is pointer to SMT engine */
Store_field(res, smt_field, (value) smt);
/* Third field is the number of context pushes */
Store_field(res, stack_level_field, (value) 0);
/* Fourth field is the symbol table */
Store_field(res, symtab_field, (value) symtab);
/* Return CVC4 instance */
CAMLreturn(res);
} catch(Exception& e) {
/* Throw OCaml exception */
caml_failwith(e.what());
}
}
/* Return the type of integers
external cvc4_get_integer_type : cvc4_solver -> cvc4_type = "cvc4_get_integer_type"
*/
extern "C" CAMLprim value cvc4_get_integer_type(value solver_in)
{
#ifdef DEBUG
std::cerr << "cvc4_get_integer_type" << std::endl;
#endif
/* Declare parameters */
CAMLparam1 (solver_in);
/* Allocate for result */
CAMLlocal1 (res);
/* Get expresssion mananger */
ExprManager* em = (ExprManager*) Field(solver_in, em_field);
try {
/* Get integer type from expression manager */
Type type = em->integerType();
/* Copy type into an OCaml value */
res = copy_cvc4_type(type);
/* Return type */
CAMLreturn(res);
} catch(Exception& e) {
/* Throw OCaml exception */
caml_failwith(e.what());
}
}
/* Return the type of booleans
external cvc4_get_bool_type : cvc4_solver -> cvc4_type = "cvc4_get_bool_type"
*/
extern "C" CAMLprim value cvc4_get_bool_type(value solver_in)
{
#ifdef DEBUG
std::cerr << "cvc4_get_bool_type" << std::endl;
#endif
/* Declare parameters */
CAMLparam1 (solver_in);
/* Allocate for result */
CAMLlocal1 (res);
/* Get expresssion mananger */
ExprManager* em = (ExprManager*) Field(solver_in, em_field);
try {
/* Get Boolean type from expression manager */
Type type = em->booleanType();
/* Copy type into an OCaml value */
res = copy_cvc4_type(type);
/* Return type */
CAMLreturn(res);
} catch(Exception& e) {
/* Throw OCaml exception */
caml_failwith(e.what());
}
}
/* Create a free type of the given name
external cvc4_mk_type : cvc4_solver -> string -> cvc4_type = "cvc4_mk_type"
*/
extern "C" CAMLprim value cvc4_mk_type(value solver_in, value type_name_in)
{
#ifdef DEBUG
std::cerr << "cvc4_mk_type" << std::endl;
#endif
/* Declare parameters */
CAMLparam2 (solver_in, type_name_in);
/* Allocate for a custom datatype for type */
CAMLlocal1 (res);
/* Get expresssion mananger */
ExprManager* em = (ExprManager*) Field(solver_in, em_field);
/* Get symbol table */
SymbolTable* symtab = (SymbolTable*) Field(solver_in, symtab_field);
/* Get string from value */
std::string name = std::string(String_val(type_name_in));
try {
/* Name is bound to a type in current scope? */
if (symtab->isBoundType(name)) {
/* Get type bound to name */
Type type = symtab->lookupType(name);
/* Copy type into an OCaml value */
res = copy_cvc4_type(type);
} else {
/* Create a new variable */
Type type = em->mkSort(name);
/* Copy type into an OCaml value */
res = copy_cvc4_type(type);
/* Add binding of name to variable to symbol table */
symtab->bindType(name, *cvc4_type_val(res), true);
}
/* Return type */
CAMLreturn(res);
} catch(Exception& e) {
/* Throw OCaml exception */
caml_failwith(e.what());
}
}
/* Return the propositional constant true
external cvc4_get_true_expr : cvc4_solver -> cvc4_expr = "cvc4_get_true_expr"
*/
extern "C" CAMLprim value cvc4_get_true_expr(value solver_in)
{
#ifdef DEBUG
std::cerr << "cvc4_get_true_expr" << std::endl;
#endif
/* Declare parameters */
CAMLparam1 (solver_in);
/* Allocate for result */
CAMLlocal1 (res);
/* Get expresssion mananger */
ExprManager* em = (ExprManager*) Field(solver_in, em_field);
try {
/* Get true constant of expression manager */
Expr expr = em->mkConst(true);
/* Copy expression into an OCaml value */
res = copy_cvc4_expr(expr);
/* Return type */
CAMLreturn(res);
} catch(Exception& e) {
/* Throw OCaml exception */
caml_failwith(e.what());
}
}
/* Return the propositional constant false
external cvc4_get_false_expr : cvc4_solver -> cvc4_expr = "cvc4_get_false_expr"
*/
extern "C" CAMLprim value cvc4_get_false_expr(value solver_in)
{
#ifdef DEBUG
std::cerr << "cvc4_get_false_expr" << std::endl;
#endif
/* Declare parameters */
CAMLparam1 (solver_in);
/* Allocate for result */
CAMLlocal1 (res);
/* Get expresssion mananger */
ExprManager* em = (ExprManager*) Field(solver_in, em_field);
try {
/* Get false constant of expression manager */
Expr expr = em->mkConst(false);
/* Copy expression into an OCaml value */
res = copy_cvc4_expr(expr);
/* Return type */
CAMLreturn(res);
} catch(Exception& e) {
/* Throw OCaml exception */
caml_failwith(e.what());
}
}
/* Create a variable of the given name and type
external cvc4_mk_var : cvc4_solver -> string -> cvc4_type -> cvc4_expr = "cvc4_mk_var"
*/
extern "C" CAMLprim value cvc4_mk_var(value solver_in, value var_name_in, value type_in)
{
#ifdef DEBUG
std::cerr << "cvc4_mk_var" << std::endl;
#endif
/* Declare parameters */
CAMLparam3 (solver_in, var_name_in, type_in);
/* Allocate for result */
CAMLlocal1 (res);
/* Get expresssion mananger */
ExprManager* em = (ExprManager*) Field(solver_in, em_field);
/* Get symbol table */
SymbolTable* symtab = (SymbolTable*) Field(solver_in, symtab_field);
/* Get CVC4 type from value */
Type* t = cvc4_type_val(type_in);
/* Get string from value */
std::string name = std::string(String_val(var_name_in));
try {
/* Name is bound to an expression in current scope? */
if (symtab->isBound(name)) {
/* Get expression bound to name */
Expr expr = symtab->lookup(name);
/* Check to make sure it is a variable */
if (!expr.isVariable()) caml_failwith("cvc4_mk_var: name is not a variable");
/* Copy expression bound to name into an OCaml value */
res = copy_cvc4_expr(expr);
} else {
/* Create a new variable */
Expr expr = em->mkVar(name, *t);
/* Copy expression into an OCaml value */
res = copy_cvc4_expr(expr);
/* Add binding of name to variable to symbol table */
symtab->bind(name, *cvc4_expr_val(res), true);
}
/* Return type */
CAMLreturn(res);
} catch(Exception& e) {
/* Throw OCaml exception */
caml_failwith(e.what());
}
}
/* Negate an expression
external cvc4_mk_not : cvc4_solver -> cvc4_expr -> cvc4_expr = "cvc4_mk_not"
*/
extern "C" CAMLprim value cvc4_mk_not(value solver_in, value expr_in)
{
#ifdef DEBUG
std::cerr << "cvc4_mk_not" << std::endl;
#endif
/* Declare parameters */
CAMLparam2 (solver_in, expr_in);
/* Allocate for a custom datatype for expression */
CAMLlocal1 (res);
/* Get expresssion mananger */
ExprManager* em = (ExprManager*) Field(solver_in, em_field);
/* Get CVC4 expression from value */
Expr* e = cvc4_expr_val(expr_in);
try {
/* Get expression from expression manager */
Expr expr = em->mkExpr(kind::NOT, *e);
/* Copy expression into an OCaml value */
res = copy_cvc4_expr(expr);
/* Return type */
CAMLreturn(res);
} catch(Exception& e) {
/* Throw OCaml exception */
caml_failwith(e.what());
}
}
/* Negate an expression avoiding double negation
external cvc4_negate : cvc4_solver -> cvc4_expr -> cvc4_expr = "cvc4_negate"
*/
extern "C" CAMLprim value cvc4_negate(value solver_in, value expr_in)
{
#ifdef DEBUG
std::cerr << "cvc4_negate" << std::endl;
#endif
// Declare parameters
CAMLparam2 (solver_in, expr_in);
// Allocate for a custom datatype for expression
CAMLlocal1 (res);
/* Get expresssion mananger */
ExprManager* em = (ExprManager*) Field(solver_in, em_field);
/* Get CVC4 expression from value */
Expr* e = cvc4_expr_val(expr_in);
try {
/* Expression is a NOT? */
if (e->getKind() == kind::NOT) {
/* Get expression under negation */
Expr expr = e->operator[](0);
/* Copy expression into an OCaml value */
res = copy_cvc4_expr(expr);
} else {
/* Negate positive expression */
Expr expr = em->mkExpr(kind::NOT, *e);
/* Copy expression into an OCaml value */
res = copy_cvc4_expr(expr);
}
/* Return type */
CAMLreturn(res);
} catch(Exception& e) {
/* Throw OCaml exception */
caml_failwith(e.what());
}
}
/* Create a function type of domain and range
The list domain_in must contain at least one element
external cvc4_mk_function_type : cvc4_solver -> cvc4_type list -> cvc4_type -> cvc4_fun_type = "cvc4_mk_function_type"
*/
extern "C" CAMLprim value cvc4_mk_function_type(value solver_in, value symbol_in, value domain_in, value range_in)
{
#ifdef DEBUG
std::cerr << "cvc4_mk_function_type" << std::endl;
#endif
/* Declare parameters */
CAMLparam4 (solver_in, symbol_in, domain_in, range_in);
/* Allocate for result */
CAMLlocal1 (res);
/* Allocate for local variables */
CAMLlocal2 (head, type_in);
/* Get expresssion mananger */
ExprManager* em = (ExprManager*) Field(solver_in, em_field);
/* Get symbol table */
SymbolTable* symtab = (SymbolTable*) Field(solver_in, symtab_field);
/* String of OCaml value */
std::string symbol = std::string(String_val(symbol_in));
try {
/* Name is bound to a type in current scope? */
if (symtab->isBound(symbol)) {
/* Get type of function */
Expr funOp = symtab->lookup(symbol);
#ifdef DEBUG
std::cerr << "cvc4_mk_function_type: found " << funOp << std::endl;
#endif
/* Copy expression into an OCaml value */
res = copy_cvc4_expr(funOp);
/* Return type */
CAMLreturn(res);
} else {
/* Empty vector for list of domain types */
std::vector<Type> domain;
/* A type in the domain */
Type* type;
/* Set to head of list */
head = domain_in;
/* Iterate list of types */
while (head != Val_emptylist)
{
/* Get element at head of list */
type_in = Field(head, 0);
type = cvc4_type_val(type_in);
/* Push type at head of list to end of vector */
domain.push_back(Type(*type));
/* Continue with tail of list */
head = Field(head, 1);
}
/* Get CVC4 expression from value */
Type* range = cvc4_type_val(range_in);
/* Create type of function */
Type funType = Type(em->mkFunctionType(domain, *range));
/* Create an operator expression of type */
Expr funOp = em->mkVar(symbol, funType);
#ifdef DEBUG
std::cerr << "cvc4_mk_function_type: created " << funOp << std::endl;
#endif
/* Copy expression into an OCaml value */
res = copy_cvc4_expr(funOp);
/* Add binding of name to variable to symbol table */
symtab->bind(symbol, *cvc4_expr_val(res), true);
/* Return type */
CAMLreturn(res);
}
} catch(Exception& e) {
/* Throw OCaml exception */
caml_failwith(e.what());
}
}
/* Create a functional expression
external cvc4_mk_function_expr : cvc4_solver -> cvc4_type -> cvc4_expr list -> cvc4_type -> cvc4_type = "cvc4_mk_function_expr"
*/
extern "C" CAMLprim value cvc4_mk_function_expr(value solver_in, value op_in, value args_in)
{
#ifdef DEBUG
std::cerr << "cvc4_mk_function_expr" << std::endl;
#endif
/* Declare parameters */
CAMLparam3 (solver_in, op_in, args_in);
/* Allocate for result */
CAMLlocal1 (res);
/* Allocate for local variables */
CAMLlocal2 (head, arg_in);
/* Get expresssion mananger */
ExprManager* em = (ExprManager*) Field(solver_in, em_field);
/* Get operator */
Expr* op = cvc4_expr_val(op_in);
/* Empty vector for list of arguments */
std::vector<Expr> opargs;
/* Begin list of arguments with operator */
opargs.push_back(*op);
/* An argument of the function */
Expr* arg;
/* Set to head of list */
head = args_in;
/* Iterate list of arguments */
while (head != Val_emptylist)
{
/* Get element at head of list */
arg_in = Field(head, 0);
arg = cvc4_expr_val(arg_in);
/* Push argument at head of list to end of vector */
opargs.push_back(Expr(*arg));
/* Continue with tail of list */
head = Field(head, 1);
}
try {
/* Create uninterpreted function application */
Expr expr = em->mkExpr(kind::APPLY_UF, opargs);
/* Copy expression into an OCaml value */
res = copy_cvc4_expr(expr);
/* Return type */
CAMLreturn(res);
} catch(Exception& e) {
/* Throw OCaml exception */
caml_failwith(e.what());
}
}
/* Create a predicate type of domain
The list domain_in must contain at least one element
external cvc4_mk_predicate_type : cvc4_solver -> cvc4_type list -> cvc4_pred_type = "cvc4_mk_predicate_type"
*/
extern "C" CAMLprim value cvc4_mk_predicate_type(value solver_in, value symbol_in, value domain_in)
{
#ifdef DEBUG
std::cerr << "cvc4_mk_predicate_type" << std::endl;
#endif
/* Declare parameters */
CAMLparam3 (solver_in, symbol_in, domain_in);
/* Allocate for result */
CAMLlocal1 (res);
/* Allocate for local variables */
CAMLlocal2 (head, type_in);
/* Get expresssion mananger */
ExprManager* em = (ExprManager*) Field(solver_in, em_field);
/* Get symbol table */
SymbolTable* symtab = (SymbolTable*) Field(solver_in, symtab_field);
/* String of OCaml value */
std::string symbol = std::string(String_val(symbol_in));
try {
/* Name is bound to a type in current scope? */
if (symtab->isBound(symbol)) {
/* Get type of function */
Expr predOp = symtab->lookup(symbol);
#ifdef DEBUG
std::cerr << "cvc4_mk_predicate_type: found " << predOp << std::endl;