kc3-lang/harfbuzz/src/hb-wasm-api.hh

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• Hash : 4260de12
  Author :
  Date : 2023-02-25T10:43:27
  

  [wasm] Add HB_ARRAY_APP2NATIVE
  

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• src/hb-wasm-api.hh

• /*
   * 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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