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#ifndef RUBY_MEMORY_VIEW_H
#define RUBY_MEMORY_VIEW_H 1
/**
* @file
* @author Ruby developers <ruby-core@ruby-lang.org>
* @copyright This file is a part of the programming language Ruby.
* Permission is hereby granted, to either redistribute and/or
* modify this file, provided that the conditions mentioned in the
* file COPYING are met. Consult the file for details.
* @brief Memory View.
*/
#include "ruby/internal/dllexport.h"
#include "ruby/internal/stdbool.h"
#include "ruby/internal/value.h"
#include "ruby/intern.h"
enum ruby_memory_view_flags {
RUBY_MEMORY_VIEW_SIMPLE = 0,
RUBY_MEMORY_VIEW_WRITABLE = (1<<0),
RUBY_MEMORY_VIEW_FORMAT = (1<<1),
RUBY_MEMORY_VIEW_MULTI_DIMENSIONAL = (1<<2),
RUBY_MEMORY_VIEW_STRIDES = (1<<3) | RUBY_MEMORY_VIEW_MULTI_DIMENSIONAL,
RUBY_MEMORY_VIEW_ROW_MAJOR = (1<<4) | RUBY_MEMORY_VIEW_STRIDES,
RUBY_MEMORY_VIEW_COLUMN_MAJOR = (1<<5) | RUBY_MEMORY_VIEW_STRIDES,
RUBY_MEMORY_VIEW_ANY_CONTIGUOUS = RUBY_MEMORY_VIEW_ROW_MAJOR | RUBY_MEMORY_VIEW_COLUMN_MAJOR,
RUBY_MEMORY_VIEW_INDIRECT = (1<<6) | RUBY_MEMORY_VIEW_STRIDES,
};
typedef struct {
char format;
unsigned native_size_p: 1;
unsigned little_endian_p: 1;
size_t offset;
size_t size;
size_t repeat;
} rb_memory_view_item_component_t;
typedef struct {
/* The original object that has the memory exported via this memory view.
* The consumer of this memory view has the responsibility to call rb_gc_mark
* for preventing this obj collected by GC. */
VALUE obj;
/* The pointer to the exported memory. */
void *data;
/* The number of bytes in data. */
ssize_t byte_size;
/* true for readonly memory, false for writable memory. */
bool readonly;
/* A string to describe the format of an element, or NULL for unsigned bytes.
* The format string is a sequence of the following pack-template specifiers:
*
* c, C, s, s!, S, S!, n, v, i, i!, I, I!, l, l!, L, L!,
* N, V, f, e, g, q, q!, Q, Q!, d, E, G, j, J, x
*
* For example, "dd" for an element that consists of two double values,
* and "CCC" for an element that consists of three bytes, such as
* an RGB color triplet.
*
* Also, the value endianness can be explicitly specified by '<' or '>'
* following a value type specifier.
*
* The items are packed contiguously. When you emulate the alignment of
* structure members, put '|' at the beginning of the format string,
* like "|iqc". On x86_64 Linux ABI, the size of the item by this format
* is 24 bytes instead of 13 bytes.
*/
const char *format;
/* The number of bytes in each element.
* item_size should equal to rb_memory_view_item_size_from_format(format). */
ssize_t item_size;
struct {
/* The array of rb_memory_view_item_component_t that describes the
* item structure. rb_memory_view_prepare_item_desc and
* rb_memory_view_get_item allocate this memory if needed,
* and rb_memory_view_release frees it. */
const rb_memory_view_item_component_t *components;
/* The number of components in an item. */
size_t length;
} item_desc;
/* The number of dimension. */
ssize_t ndim;
/* ndim size array indicating the number of elements in each dimension.
* This can be NULL when ndim == 1. */
const ssize_t *shape;
/* ndim size array indicating the number of bytes to skip to go to the
* next element in each dimension. */
const ssize_t *strides;
/* The offset in each dimension when this memory view exposes a nested array.
* Or, NULL when this memory view exposes a flat array. */
const ssize_t *sub_offsets;
/* the private data for managing this exported memory */
void *const private;
} rb_memory_view_t;
typedef bool (* rb_memory_view_get_func_t)(VALUE obj, rb_memory_view_t *view, int flags);
typedef bool (* rb_memory_view_release_func_t)(VALUE obj, rb_memory_view_t *view);
typedef bool (* rb_memory_view_available_p_func_t)(VALUE obj);
typedef struct {
rb_memory_view_get_func_t get_func;
rb_memory_view_release_func_t release_func;
rb_memory_view_available_p_func_t available_p_func;
} rb_memory_view_entry_t;
RBIMPL_SYMBOL_EXPORT_BEGIN()
/* memory_view.c */
bool rb_memory_view_register(VALUE klass, const rb_memory_view_entry_t *entry);
RBIMPL_ATTR_PURE()
bool rb_memory_view_is_row_major_contiguous(const rb_memory_view_t *view);
RBIMPL_ATTR_PURE()
bool rb_memory_view_is_column_major_contiguous(const rb_memory_view_t *view);
RBIMPL_ATTR_NOALIAS()
void rb_memory_view_fill_contiguous_strides(const ssize_t ndim, const ssize_t item_size, const ssize_t *const shape, const bool row_major_p, ssize_t *const strides);
RBIMPL_ATTR_NOALIAS()
bool rb_memory_view_init_as_byte_array(rb_memory_view_t *view, VALUE obj, void *data, const ssize_t len, const bool readonly);
ssize_t rb_memory_view_parse_item_format(const char *format,
rb_memory_view_item_component_t **members,
size_t *n_members, const char **err);
ssize_t rb_memory_view_item_size_from_format(const char *format, const char **err);
void *rb_memory_view_get_item_pointer(rb_memory_view_t *view, const ssize_t *indices);
VALUE rb_memory_view_extract_item_members(const void *ptr, const rb_memory_view_item_component_t *members, const size_t n_members);
void rb_memory_view_prepare_item_desc(rb_memory_view_t *view);
VALUE rb_memory_view_get_item(rb_memory_view_t *view, const ssize_t *indices);
bool rb_memory_view_available_p(VALUE obj);
bool rb_memory_view_get(VALUE obj, rb_memory_view_t* memory_view, int flags);
bool rb_memory_view_release(rb_memory_view_t* memory_view);
/* for testing */
RUBY_EXTERN VALUE rb_memory_view_exported_object_registry;
RUBY_EXTERN const rb_data_type_t rb_memory_view_exported_object_registry_data_type;
RBIMPL_SYMBOL_EXPORT_END()
RBIMPL_ATTR_PURE()
static inline bool
rb_memory_view_is_contiguous(const rb_memory_view_t *view)
{
if (rb_memory_view_is_row_major_contiguous(view)) {
return true;
}
else if (rb_memory_view_is_column_major_contiguous(view)) {
return true;
}
else {
return false;
}
}
#endif /* RUBY_BUFFER_H */