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<title>The GNU Fortran Compiler: caf_reference_t</title>
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Next: <a href="caf_005fteam_005ft.html#caf_005fteam_005ft" accesskey="n" rel="next">caf_team_t</a>, Previous: <a href="caf_005fderegister_005ft.html#caf_005fderegister_005ft" accesskey="p" rel="prev">caf_deregister_t</a>, Up: <a href="Type-and-enum-ABI-Documentation.html#Type-and-enum-ABI-Documentation" accesskey="u" rel="up">Type and enum ABI Documentation</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<a name="caf_005freference_005ft-1"></a>
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<h4 class="subsection">8.1.4 <code>caf_reference_t</code></h4>
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<p>The structure used for implementing arbitrary reference chains.
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A <code>CAF_REFERENCE_T</code> allows to specify a component reference or any kind
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of array reference of any rank supported by gfortran. For array references all
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kinds as known by the compiler/Fortran standard are supported indicated by
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a <code>MODE</code>.
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</p>
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<pre class="verbatim">typedef enum caf_ref_type_t {
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/* Reference a component of a derived type, either regular one or an
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allocatable or pointer type. For regular ones idx in caf_reference_t is
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set to -1. */
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CAF_REF_COMPONENT,
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/* Reference an allocatable array. */
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CAF_REF_ARRAY,
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/* Reference a non-allocatable/non-pointer array. I.e., the coarray object
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has no array descriptor associated and the addressing is done
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completely using the ref. */
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CAF_REF_STATIC_ARRAY
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} caf_ref_type_t;
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</pre>
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<pre class="verbatim">typedef enum caf_array_ref_t {
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/* No array ref. This terminates the array ref. */
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CAF_ARR_REF_NONE = 0,
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/* Reference array elements given by a vector. Only for this mode
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caf_reference_t.u.a.dim[i].v is valid. */
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CAF_ARR_REF_VECTOR,
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/* A full array ref (:). */
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CAF_ARR_REF_FULL,
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/* Reference a range on elements given by start, end and stride. */
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CAF_ARR_REF_RANGE,
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/* Only a single item is referenced given in the start member. */
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CAF_ARR_REF_SINGLE,
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/* An array ref of the kind (i:), where i is an arbitrary valid index in the
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array. The index i is given in the start member. */
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CAF_ARR_REF_OPEN_END,
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/* An array ref of the kind (:i), where the lower bound of the array ref
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is given by the remote side. The index i is given in the end member. */
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CAF_ARR_REF_OPEN_START
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} caf_array_ref_t;
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</pre>
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<pre class="verbatim">/* References to remote components of a derived type. */
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typedef struct caf_reference_t {
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/* A pointer to the next ref or NULL. */
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struct caf_reference_t *next;
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/* The type of the reference. */
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/* caf_ref_type_t, replaced by int to allow specification in fortran FE. */
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int type;
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/* The size of an item referenced in bytes. I.e. in an array ref this is
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the factor to advance the array pointer with to get to the next item.
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For component refs this gives just the size of the element referenced. */
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size_t item_size;
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union {
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struct {
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/* The offset (in bytes) of the component in the derived type.
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Unused for allocatable or pointer components. */
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ptrdiff_t offset;
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/* The offset (in bytes) to the caf_token associated with this
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component. NULL, when not allocatable/pointer ref. */
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ptrdiff_t caf_token_offset;
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} c;
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struct {
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/* The mode of the array ref. See CAF_ARR_REF_*. */
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/* caf_array_ref_t, replaced by unsigend char to allow specification in
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fortran FE. */
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unsigned char mode[GFC_MAX_DIMENSIONS];
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/* The type of a static array. Unset for array's with descriptors. */
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int static_array_type;
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/* Subscript refs (s) or vector refs (v). */
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union {
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struct {
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/* The start and end boundary of the ref and the stride. */
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index_type start, end, stride;
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} s;
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struct {
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/* nvec entries of kind giving the elements to reference. */
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void *vector;
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/* The number of entries in vector. */
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size_t nvec;
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/* The integer kind used for the elements in vector. */
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int kind;
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} v;
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} dim[GFC_MAX_DIMENSIONS];
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} a;
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} u;
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} caf_reference_t;
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</pre>
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<p>The references make up a single linked list of reference operations. The
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<code>NEXT</code> member links to the next reference or NULL to indicate the end of
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the chain. Component and array refs can be arbitrarly mixed as long as they
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comply to the Fortran standard.
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</p>
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<p><em>NOTES</em>
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The member <code>STATIC_ARRAY_TYPE</code> is used only when the <code>TYPE</code> is
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<code>CAF_REF_STATIC_ARRAY</code>. The member gives the type of the data referenced.
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Because no array descriptor is available for a descriptor-less array and
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type conversion still needs to take place the type is transported here.
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</p>
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<p>At the moment <code>CAF_ARR_REF_VECTOR</code> is not implemented in the front end for
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descriptor-less arrays. The library caf_single has untested support for it.
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</p>
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<p>
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Next: <a href="caf_005fteam_005ft.html#caf_005fteam_005ft" accesskey="n" rel="next">caf_team_t</a>, Previous: <a href="caf_005fderegister_005ft.html#caf_005fderegister_005ft" accesskey="p" rel="prev">caf_deregister_t</a>, Up: <a href="Type-and-enum-ABI-Documentation.html#Type-and-enum-ABI-Documentation" accesskey="u" rel="up">Type and enum ABI Documentation</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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