Print NULL instead of crashing for CString.toCYON.

[cycript.git] / sig / ffi_type.cpp

/* Cycript - Optimizing JavaScript Compiler/Runtime
 * Copyright (C) 2009-2015  Jay Freeman (saurik)
*/

/* GNU Affero General Public License, Version 3 {{{ */
/*
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.

 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
**/
/* }}} */

#include "Error.hpp"

#include "sig/ffi_type.hpp"
#include "sig/types.hpp"

#define ffi_type_slonglong ffi_type_sint64
#define ffi_type_ulonglong ffi_type_uint64

namespace sig {

void sig_ffi_types(
    CYPool &pool,
    ffi_type *(*sig_ffi_type)(CYPool &, struct Type *),
    struct Signature *signature,
    ffi_type **types,
    size_t skip = 0,
    size_t offset = 0
) {
    _assert(signature->count >= skip);
    for (size_t index = skip; index != signature->count; ++index)
        types[index - skip + offset] = (*sig_ffi_type)(pool, signature->elements[index].type);
}

ffi_type *ObjectiveC(CYPool &pool, struct Type *type) {
    switch (type->primitive) {
        case typename_P: return &ffi_type_pointer;

        case union_P:
            /* XXX: we can totally make this work */
            _assert(false);
        break;

        case string_P: return &ffi_type_pointer;
        case selector_P: return &ffi_type_pointer;
        case block_P: return &ffi_type_pointer;
        case object_P: return &ffi_type_pointer;
        case boolean_P: return &ffi_type_uchar;
        case uchar_P: return &ffi_type_uchar;
        case uint_P: return &ffi_type_uint;
        case ulong_P: return &ffi_type_ulong;
        case ulonglong_P: return &ffi_type_ulonglong;
        case ushort_P: return &ffi_type_ushort;

        case array_P: {
            // XXX: this is really lame
            ffi_type *aggregate(new(pool) ffi_type());
            aggregate->size = 0;
            aggregate->alignment = 0;
            aggregate->type = FFI_TYPE_STRUCT;

            ffi_type *element(ObjectiveC(pool, type->data.data.type));
            size_t size(type->data.data.size);

            aggregate->elements = new(pool) ffi_type *[size + 1];
            for (size_t i(0); i != size; ++i)
                aggregate->elements[i] = element;
            aggregate->elements[size] = NULL;

            return aggregate;
        } break;

        case pointer_P: return &ffi_type_pointer;

        case bit_P:
            /* XXX: we can totally make this work */
            _assert(false);
        break;

        case schar_P: return &ffi_type_schar;
        case double_P: return &ffi_type_double;
        case float_P: return &ffi_type_float;
        case int_P: return &ffi_type_sint;
        case long_P: return &ffi_type_slong;
        case longlong_P: return &ffi_type_slonglong;
        case short_P: return &ffi_type_sshort;

        case void_P: return &ffi_type_void;
        case char_P: return &ffi_type_schar;

        case struct_P: {
            ffi_type *aggregate(new(pool) ffi_type());
            aggregate->size = 0;
            aggregate->alignment = 0;
            aggregate->type = FFI_TYPE_STRUCT;

            aggregate->elements = new(pool) ffi_type *[type->data.signature.count + 1];
            sig_ffi_types(pool, &ObjectiveC, &type->data.signature, aggregate->elements);
            aggregate->elements[type->data.signature.count] = NULL;

            return aggregate;
        } break;

        default:
            _assert(false);
        break;
    }
}

ffi_type *Java(CYPool &pool, struct Type *type) {
    switch (type->primitive) {
        case typename_P: return &ffi_type_pointer;
        case union_P: _assert(false); break;
        case string_P: return &ffi_type_pointer;
        case selector_P: return &ffi_type_pointer;
        case block_P: return &ffi_type_pointer;
        case object_P: return &ffi_type_pointer;
        case boolean_P: return &ffi_type_uchar;
        case uchar_P: return &ffi_type_uchar;
        case uint_P: return &ffi_type_uint;
        case ulong_P: return &ffi_type_ulong;
        case ulonglong_P: return &ffi_type_ulonglong;
        case ushort_P: return &ffi_type_ushort;
        case array_P: return &ffi_type_pointer;
        case pointer_P: return &ffi_type_pointer;
        case bit_P: _assert(false); break;
        case schar_P: return &ffi_type_schar;
        case double_P: return &ffi_type_double;
        case float_P: return &ffi_type_double;
        case int_P: return &ffi_type_sint;
        case long_P: return &ffi_type_slong;
        case longlong_P: return &ffi_type_slonglong;
        case short_P: return &ffi_type_sshort;
        case void_P: return &ffi_type_void;
        case char_P: return &ffi_type_schar;
        case struct_P: return &ffi_type_pointer;

        default:
            _assert(false);
        break;
    }
}

void sig_ffi_cif(
    CYPool &pool,
    ffi_type *(*sig_ffi_type)(CYPool &, struct Type *),
    struct Signature *signature,
    ffi_cif *cif,
    size_t skip,
    ffi_type **types,
    size_t offset
) {
    if (types == NULL)
        types = new(pool) ffi_type *[signature->count - 1];
    ffi_type *type = (*sig_ffi_type)(pool, signature->elements[0].type);
    sig_ffi_types(pool, sig_ffi_type, signature, types, 1 + skip, offset);
    ffi_status status = ffi_prep_cif(cif, FFI_DEFAULT_ABI, signature->count - 1 - skip + offset, type, types);
    _assert(status == FFI_OK);
}

}