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fftw-3.3.10/api/f77api.c
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161
fftw-3.3.10/api/f77api.c
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/*
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* Copyright (c) 2003, 2007-14 Matteo Frigo
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* Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include "api/api.h"
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#include "dft/dft.h"
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#include "rdft/rdft.h"
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#include "api/x77.h"
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/* if F77_FUNC is not defined, then we don't know how to mangle identifiers
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for the Fortran linker, and we must omit the f77 API. */
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#if defined(F77_FUNC) || defined(WINDOWS_F77_MANGLING)
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/*-----------------------------------------------------------------------*/
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/* some internal functions used by the f77 api */
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/* in fortran, the natural array ordering is column-major, which
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corresponds to reversing the dimensions relative to C's row-major */
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static int *reverse_n(int rnk, const int *n)
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{
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int *nrev;
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int i;
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A(FINITE_RNK(rnk));
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nrev = (int *) MALLOC(sizeof(int) * (unsigned)rnk, PROBLEMS);
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for (i = 0; i < rnk; ++i)
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nrev[rnk - i - 1] = n[i];
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return nrev;
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}
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/* f77 doesn't have data structures, so we have to pass iodims as
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parallel arrays */
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static X(iodim) *make_dims(int rnk, const int *n,
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const int *is, const int *os)
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{
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X(iodim) *dims;
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int i;
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A(FINITE_RNK(rnk));
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dims = (X(iodim) *) MALLOC(sizeof(X(iodim)) * (unsigned)rnk, PROBLEMS);
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for (i = 0; i < rnk; ++i) {
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dims[i].n = n[i];
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dims[i].is = is[i];
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dims[i].os = os[i];
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}
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return dims;
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}
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typedef struct {
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void (*f77_write_char)(char *, void *);
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void *data;
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} write_char_data;
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static void write_char(char c, void *d)
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{
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write_char_data *ad = (write_char_data *) d;
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ad->f77_write_char(&c, ad->data);
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}
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typedef struct {
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void (*f77_read_char)(int *, void *);
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void *data;
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} read_char_data;
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static int read_char(void *d)
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{
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read_char_data *ed = (read_char_data *) d;
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int c;
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ed->f77_read_char(&c, ed->data);
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return (c < 0 ? EOF : c);
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}
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static X(r2r_kind) *ints2kinds(int rnk, const int *ik)
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{
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if (!FINITE_RNK(rnk) || rnk == 0)
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return 0;
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else {
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int i;
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X(r2r_kind) *k;
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k = (X(r2r_kind) *) MALLOC(sizeof(X(r2r_kind)) * (unsigned)rnk, PROBLEMS);
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/* reverse order for Fortran -> C */
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for (i = 0; i < rnk; ++i)
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k[i] = (X(r2r_kind)) ik[rnk - 1 - i];
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return k;
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}
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}
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/*-----------------------------------------------------------------------*/
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#define F77(a, A) F77x(x77(a), X77(A))
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#ifndef WINDOWS_F77_MANGLING
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#if defined(F77_FUNC)
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# define F77x(a, A) F77_FUNC(a, A)
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# include "f77funcs.h"
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#endif
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/* If identifiers with underscores are mangled differently than those
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without underscores, then we include *both* mangling versions. The
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reason is that the only Fortran compiler that does such differing
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mangling is currently g77 (which adds an extra underscore to names
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with underscores), whereas other compilers running on the same
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machine are likely to use non-underscored mangling. (I'm sick
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of users complaining that FFTW works with g77 but not with e.g.
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pgf77 or ifc on the same machine.) Note that all FFTW identifiers
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contain underscores, and configure picks g77 by default. */
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#if defined(F77_FUNC_) && !defined(F77_FUNC_EQUIV)
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# undef F77x
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# define F77x(a, A) F77_FUNC_(a, A)
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# include "f77funcs.h"
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#endif
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#else /* WINDOWS_F77_MANGLING */
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/* Various mangling conventions common (?) under Windows. */
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/* g77 */
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# define WINDOWS_F77_FUNC(a, A) a ## __
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# define F77x(a, A) WINDOWS_F77_FUNC(a, A)
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# include "f77funcs.h"
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/* Intel, etc. */
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# undef WINDOWS_F77_FUNC
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# define WINDOWS_F77_FUNC(a, A) a ## _
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# include "f77funcs.h"
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/* Digital/Compaq/HP Visual Fortran, Intel Fortran. stdcall attribute
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is apparently required to adjust for calling conventions (callee
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pops stack in stdcall). See also:
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http://msdn.microsoft.com/library/en-us/vccore98/html/_core_mixed.2d.language_programming.3a_.overview.asp
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*/
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# undef WINDOWS_F77_FUNC
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# if defined(__GNUC__)
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# define WINDOWS_F77_FUNC(a, A) __attribute__((stdcall)) A
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# elif defined(_MSC_VER) || defined(_ICC) || defined(_STDCALL_SUPPORTED)
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# define WINDOWS_F77_FUNC(a, A) __stdcall A
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# else
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# define WINDOWS_F77_FUNC(a, A) A /* oh well */
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# endif
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# include "f77funcs.h"
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#endif /* WINDOWS_F77_MANGLING */
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#endif /* F77_FUNC */
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