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/*
* Copyright (c) 2009, Wayne Meissner
*
* Copyright (c) 2008-2013, Ruby FFI project contributors
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Ruby FFI project nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _MSC_VER
#include <sys/param.h>
#endif
#include <sys/types.h>
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <errno.h>
#include <ruby.h>
#include <ffi.h>
#include "rbffi.h"
#include "compat.h"
#include "Type.h"
#include "StructByValue.h"
#include "Struct.h"
#define FFI_ALIGN(v, a) (((((size_t) (v))-1) | ((a)-1))+1)
static VALUE sbv_allocate(VALUE);
static VALUE sbv_initialize(VALUE, VALUE);
static void sbv_mark(void *);
static void sbv_compact(void *);
static void sbv_free(void *);
static size_t sbv_memsize(const void *);
VALUE rbffi_StructByValueClass = Qnil;
static const rb_data_type_t sbv_type_data_type = {
.wrap_struct_name = "FFI::StructByValue",
.function = {
.dmark = sbv_mark,
.dfree = sbv_free,
.dsize = sbv_memsize,
ffi_compact_callback( sbv_compact )
},
.parent = &rbffi_type_data_type,
// IMPORTANT: WB_PROTECTED objects must only use the RB_OBJ_WRITE()
// macro to update VALUE references, as to trigger write barriers.
.flags = RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED | FFI_RUBY_TYPED_FROZEN_SHAREABLE
};
static VALUE
sbv_allocate(VALUE klass)
{
StructByValue* sbv;
VALUE obj = TypedData_Make_Struct(klass, StructByValue, &sbv_type_data_type, sbv);
RB_OBJ_WRITE(obj, &sbv->rbStructClass, Qnil);
RB_OBJ_WRITE(obj, &sbv->rbStructLayout, Qnil);
sbv->base.nativeType = NATIVE_STRUCT;
sbv->base.ffiType = xcalloc(1, sizeof(*sbv->base.ffiType));
sbv->base.ffiType->size = 0;
sbv->base.ffiType->alignment = 1;
sbv->base.ffiType->type = FFI_TYPE_STRUCT;
return obj;
}
static VALUE
sbv_initialize(VALUE self, VALUE rbStructClass)
{
StructByValue* sbv = NULL;
StructLayout* layout = NULL;
VALUE rbLayout = Qnil;
rbLayout = rb_ivar_get(rbStructClass, rb_intern("@layout"));
if (!rb_obj_is_instance_of(rbLayout, rbffi_StructLayoutClass)) {
rb_raise(rb_eTypeError, "wrong type in @layout ivar (expected FFI::StructLayout)");
}
TypedData_Get_Struct(rbLayout, StructLayout, &rbffi_struct_layout_data_type, layout);
TypedData_Get_Struct(self, StructByValue, &sbv_type_data_type, sbv);
RB_OBJ_WRITE(self, &sbv->rbStructClass, rbStructClass);
RB_OBJ_WRITE(self, &sbv->rbStructLayout, rbLayout);
/* We can just use everything from the ffi_type directly */
*sbv->base.ffiType = *layout->base.ffiType;
return self;
}
static void
sbv_mark(void *data)
{
StructByValue *sbv = (StructByValue *)data;
rb_gc_mark_movable(sbv->rbStructClass);
rb_gc_mark_movable(sbv->rbStructLayout);
}
static void
sbv_compact(void *data)
{
StructByValue *sbv = (StructByValue *)data;
ffi_gc_location(sbv->rbStructClass);
ffi_gc_location(sbv->rbStructLayout);
}
static void
sbv_free(void *data)
{
StructByValue *sbv = (StructByValue *)data;
xfree(sbv->base.ffiType);
xfree(sbv);
}
static size_t
sbv_memsize(const void *data)
{
const StructByValue *sbv = (const StructByValue *)data;
return sizeof(StructByValue) + sizeof(*sbv->base.ffiType);
}
static VALUE
sbv_layout(VALUE self)
{
StructByValue* sbv;
TypedData_Get_Struct(self, StructByValue, &sbv_type_data_type, sbv);
return sbv->rbStructLayout;
}
static VALUE
sbv_struct_class(VALUE self)
{
StructByValue* sbv;
TypedData_Get_Struct(self, StructByValue, &sbv_type_data_type, sbv);
return sbv->rbStructClass;
}
void
rbffi_StructByValue_Init(VALUE moduleFFI)
{
rbffi_StructByValueClass = rb_define_class_under(moduleFFI, "StructByValue", rbffi_TypeClass);
rb_global_variable(&rbffi_StructByValueClass);
rb_define_const(rbffi_TypeClass, "Struct", rbffi_StructByValueClass);
rb_define_alloc_func(rbffi_StructByValueClass, sbv_allocate);
rb_define_method(rbffi_StructByValueClass, "initialize", sbv_initialize, 1);
rb_define_method(rbffi_StructByValueClass, "layout", sbv_layout, 0);
rb_define_method(rbffi_StructByValueClass, "struct_class", sbv_struct_class, 0);
}
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