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/*
* Copyright (c) 2008, 2009, Wayne Meissner
*
* 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.
* * The name of the author or authors may not 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 THE COPYRIGHT OWNER OR CONTRIBUTORS 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 RBFFI_ABSTRACTMEMORY_H
#define RBFFI_ABSTRACTMEMORY_H
#include <sys/param.h>
#include <sys/types.h>
#include <stdint.h>
#include "compat.h"
#include "Types.h"
#ifdef __cplusplus
extern "C" {
#endif
#define MEM_RD 0x01
#define MEM_WR 0x02
#define MEM_CODE 0x04
typedef struct AbstractMemory_ AbstractMemory;
typedef struct {
VALUE (*get)(AbstractMemory* ptr, long offset);
void (*put)(AbstractMemory* ptr, long offset, VALUE value);
} MemoryOp;
typedef struct {
MemoryOp* int8;
MemoryOp* uint8;
MemoryOp* int16;
MemoryOp* uint16;
MemoryOp* int32;
MemoryOp* uint32;
MemoryOp* int64;
MemoryOp* uint64;
MemoryOp* slong;
MemoryOp* ulong;
MemoryOp* float32;
MemoryOp* float64;
MemoryOp* pointer;
MemoryOp* strptr;
} MemoryOps;
struct AbstractMemory_ {
char* address; // Use char* instead of void* to ensure adding to it works correctly
long size;
int access;
int typeSize;
};
extern VALUE rbffi_AbstractMemoryClass;
extern MemoryOps rbffi_AbstractMemoryOps;
extern void rbffi_AbstractMemory_Init(VALUE ffiModule);
extern AbstractMemory* rbffi_AbstractMemory_Cast(VALUE obj, VALUE klass);
extern void rbffi_AbstractMemory_Error(AbstractMemory *, int op);
static inline void
checkBounds(AbstractMemory* mem, long off, long len)
{
if (unlikely((off | len | (off + len) | (mem->size - (off + len))) < 0)) {
rb_raise(rb_eIndexError, "Memory access offset=%ld size=%ld is out of bounds",
off, len);
}
}
static inline void
checkRead(AbstractMemory* mem)
{
if (unlikely((mem->access & MEM_RD) == 0)) {
rbffi_AbstractMemory_Error(mem, MEM_RD);
}
}
static inline void
checkWrite(AbstractMemory* mem)
{
if (unlikely((mem->access & MEM_WR) == 0)) {
rbffi_AbstractMemory_Error(mem, MEM_WR);
}
}
static inline MemoryOp*
get_memory_op(Type* type)
{
switch (type->nativeType) {
case NATIVE_INT8:
return rbffi_AbstractMemoryOps.int8;
case NATIVE_UINT8:
return rbffi_AbstractMemoryOps.uint8;
case NATIVE_INT16:
return rbffi_AbstractMemoryOps.int16;
case NATIVE_UINT16:
return rbffi_AbstractMemoryOps.uint16;
case NATIVE_INT32:
return rbffi_AbstractMemoryOps.int32;
case NATIVE_UINT32:
return rbffi_AbstractMemoryOps.uint32;
case NATIVE_INT64:
return rbffi_AbstractMemoryOps.int64;
case NATIVE_UINT64:
return rbffi_AbstractMemoryOps.uint64;
case NATIVE_LONG:
return rbffi_AbstractMemoryOps.slong;
case NATIVE_ULONG:
return rbffi_AbstractMemoryOps.ulong;
case NATIVE_FLOAT32:
return rbffi_AbstractMemoryOps.float32;
case NATIVE_FLOAT64:
return rbffi_AbstractMemoryOps.float64;
case NATIVE_POINTER:
return rbffi_AbstractMemoryOps.pointer;
case NATIVE_STRING:
return rbffi_AbstractMemoryOps.strptr;
default:
return NULL;
}
}
#define MEMORY(obj) rbffi_AbstractMemory_Cast((obj), rbffi_AbstractMemoryClass)
#define MEMORY_PTR(obj) MEMORY((obj))->address
#define MEMORY_LEN(obj) MEMORY((obj))->size
#ifdef __cplusplus
}
#endif
#endif /* RBFFI_ABSTRACTMEMORY_H */
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