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files >> //opt/alt/ruby30/include/ruby/memory_view.h
#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 */
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