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/*
* Copyright © 2023 Behdad Esfahbod
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
#ifndef HB_WASM_API_HH
#define HB_WASM_API_HH
#include "hb.hh"
#include <wasm_export.h>
#define HB_WASM_BEGIN_DECLS namespace hb { namespace wasm {
#define HB_WASM_END_DECLS }}
#define HB_WASM_API(ret_t, name) HB_INTERNAL ret_t name
#define HB_WASM_API_COMPOUND(ret_t, name) HB_INTERNAL void name
#define HB_WASM_EXEC_ENV wasm_exec_env_t exec_env,
#define HB_WASM_EXEC_ENV_COMPOUND wasm_exec_env_t exec_env, ptr_t() retptr,
#define ptr_t(type_t) uint32_t
#define ptr_d(type_t, name) uint32_t name##ptr
#include "hb-wasm-api.h"
#undef HB_WASM_BEGIN_DECLS
#undef HB_WASM_END_DECLS
enum {
hb_wasm_ref_type_none,
hb_wasm_ref_type_face,
hb_wasm_ref_type_font,
hb_wasm_ref_type_buffer,
};
HB_INTERNAL extern hb_user_data_key_t _hb_wasm_ref_type_key;
#define nullref 0
#define HB_REF2OBJ(obj) \
hb_##obj##_t *obj = nullptr; \
HB_STMT_START { \
(void) wasm_externref_ref2obj (obj##ptr, (void **) &obj); \
/* Check object type. */ \
/* This works because all our objects have the same hb_object_t layout. */ \
if (unlikely (hb_##obj##_get_user_data (obj, &_hb_wasm_ref_type_key) != \
(void *) hb_wasm_ref_type_##obj)) \
obj = hb_##obj##_get_empty (); \
} HB_STMT_END
#define HB_OBJ2REF(obj) \
uint32_t obj##ref = nullref; \
HB_STMT_START { \
hb_##obj##_set_user_data (obj, &_hb_wasm_ref_type_key, \
(void *) hb_wasm_ref_type_##obj, \
nullptr, false); \
(void) wasm_externref_obj2ref (module_inst, obj, &obj##ref); \
} HB_STMT_END
#define HB_RETURN_STRUCT(type, name) \
type *_name_ptr = nullptr; \
{ \
if (likely (wasm_runtime_validate_app_addr (module_inst, \
retptr, sizeof (type)))) \
{ \
_name_ptr = (type *) wasm_runtime_addr_app_to_native (module_inst, retptr); \
if (unlikely (!_name_ptr)) \
return; \
} \
} \
type &name = *_name_ptr
#define HB_PTR_PARAM(type, name) \
type *name = nullptr; \
HB_STMT_START { \
if (likely (wasm_runtime_validate_app_addr (module_inst, \
name##ptr, sizeof (type)))) \
name = (type *) wasm_runtime_addr_app_to_native (module_inst, name##ptr); \
} HB_STMT_END
#define HB_ARRAY_PARAM(type, name, length) \
type *name = nullptr; \
HB_STMT_START { \
if (likely (!hb_unsigned_mul_overflows (length, sizeof (type)) && \
wasm_runtime_validate_app_addr (module_inst, \
name##ptr, length * sizeof (type)))) \
name = (type *) wasm_runtime_addr_app_to_native (module_inst, name##ptr); \
} HB_STMT_END
#define HB_ARRAY_APP2NATIVE(type, name, length) \
((type *) (!hb_unsigned_mul_overflows (length, sizeof (type)) && \
validate_app_addr (name, (length) * sizeof (type)) ? \
addr_app_to_native (name) : nullptr))
#endif /* HB_WASM_API_HH */
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