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add method to create bit-vectors directly from an array of Booleans

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-11-15 14:44:59 -08:00
parent 2c97eb1393
commit 795e0c641a
7 changed files with 45 additions and 15 deletions
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14
src/api/api_numeral.cpp
View file

@ -387,4 +387,18 @@ extern "C" {
Z3_CATCH_RETURN(Z3_FALSE);
}
Z3_ast Z3_API Z3_mk_bv_numeral(Z3_context c, unsigned sz, Z3_bool const* bits) {
Z3_TRY;
LOG_Z3_mk_bv_numeral(c, sz, bits);
RESET_ERROR_CODE();
rational r(0), two(2), one(1);
for (unsigned i = 0; i < sz; ++i) {
r *= two;
if (bits[i]) r += one;
}
ast * a = mk_c(c)->mk_numeral_core(r, mk_c(c)->bvutil().mk_sort(sz));
RETURN_Z3(of_ast(a));
Z3_CATCH_RETURN(0);
}
};

6
src/api/c++/z3++.h
View file

@ -301,6 +301,7 @@ namespace z3 {
expr bv_val(__int64 n, unsigned sz);
expr bv_val(__uint64 n, unsigned sz);
expr bv_val(char const * n, unsigned sz);
expr bv_val(unsigned n, bool const* bits);
expr string_val(char const* s);
expr string_val(std::string const& s);
@ -2455,6 +2456,11 @@ namespace z3 {
inline expr context::bv_val(__int64 n, unsigned sz) { Z3_ast r = Z3_mk_int64(m_ctx, n, bv_sort(sz)); check_error(); return expr(*this, r); }
inline expr context::bv_val(__uint64 n, unsigned sz) { Z3_ast r = Z3_mk_unsigned_int64(m_ctx, n, bv_sort(sz)); check_error(); return expr(*this, r); }
inline expr context::bv_val(char const * n, unsigned sz) { Z3_ast r = Z3_mk_numeral(m_ctx, n, bv_sort(sz)); check_error(); return expr(*this, r); }
inline expr context::bv_val(unsigned n, bool const* bits) {
array<Z3_bool> _bits(n);
for (unsigned i = 0; i < n; ++i) _bits[i] = bits[i] ? 1 : 0;
Z3_ast r = Z3_mk_bv_numeral(m_ctx, n, _bits.ptr()); check_error(); return expr(*this, r);
}
inline expr context::string_val(char const* s) { Z3_ast r = Z3_mk_string(m_ctx, s); check_error(); return expr(*this, r); }
inline expr context::string_val(std::string const& s) { Z3_ast r = Z3_mk_string(m_ctx, s.c_str()); check_error(); return expr(*this, r); }

14
src/api/dotnet/Context.cs
View file

@ -3127,6 +3127,20 @@ namespace Microsoft.Z3
return (BitVecNum)MkNumeral(v, MkBitVecSort(size));
}
/// <summary>
/// Create a bit-vector numeral.
/// </summary>
/// <param name="bits">An array of bits representing the bit-vector. Least signficant bit is at position 0.</param>
public BitVecNum MkBV(bool[] bits)
{
Contract.Ensures(Contract.Result<BitVecNum>() != null);
int[] _bits = new int[bits.Length];
for (int i = 0; i < bits.Length; ++i) _bits[i] = bits[i] ? 1 : 0;
return (BitVecNum)Expr.Create(this, Native.Z3_mk_bv_numeral(nCtx, (uint)bits.Length, _bits));
}
#endregion
#endregion // Numerals

8
src/api/z3_api.h
View file

@ -3248,6 +3248,14 @@ extern "C" {
*/
Z3_ast Z3_API Z3_mk_unsigned_int64(Z3_context c, __uint64 v, Z3_sort ty);
/**
\brief create a bit-vector numeral from a vector of Booleans.
\sa Z3_mk_numeral
def_API('Z3_mk_bv_numeral', AST, (_in(CONTEXT), _in(UINT), _in_array(1, BOOL)))
*/
Z3_ast Z3_API Z3_mk_bv_numeral(Z3_context c, unsigned sz, Z3_bool const* bits);
/*@}*/
/** @name Sequences and regular expressions */