Transpiling fortran code to golang code

Overview

f4go

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Example of use

> # Install golang
> # Compile f4go
> go get -u github.com/Konstantin8105/f4go
> cd $GOPATH/src/github.com/Konstantin8105/f4go
> go build
> ./f4go ./testdata/blas/caxpy.f
> # Look on Go result source
> less ./testdata/blas/caxpy.go

Transpiling fortran code to golang code

Present result:

*> \brief \b CAXPY
*
*  =========== DOCUMENTATION ===========
*
* Online html documentation available at
*            http://www.netlib.org/lapack/explore-html/
*
*  Definition:
*  ===========
*
*       SUBROUTINE CAXPY(N,CA,CX,INCX,CY,INCY)
*
*       .. Scalar Arguments ..
*       COMPLEX CA
*       INTEGER INCX,INCY,N
*       ..
*       .. Array Arguments ..
*       COMPLEX CX(*),CY(*)
*       ..
*
*
*> \par Purpose:
*  =============
*>
*> \verbatim
*>
*>    CAXPY constant times a vector plus a vector.
*> \endverbatim
*
*  Arguments:
*  ==========
*
*> \param[in] N
*> \verbatim
*>          N is INTEGER
*>         number of elements in input vector(s)
*> \endverbatim
*>
*> \param[in] CA
*> \verbatim
*>          CA is COMPLEX
*>           On entry, CA specifies the scalar alpha.
*> \endverbatim
*>
*> \param[in] CX
*> \verbatim
*>          CX is COMPLEX array, dimension ( 1 + ( N - 1 )*abs( INCX ) )
*> \endverbatim
*>
*> \param[in] INCX
*> \verbatim
*>          INCX is INTEGER
*>         storage spacing between elements of CX
*> \endverbatim
*>
*> \param[in,out] CY
*> \verbatim
*>          CY is COMPLEX array, dimension ( 1 + ( N - 1 )*abs( INCY ) )
*> \endverbatim
*>
*> \param[in] INCY
*> \verbatim
*>          INCY is INTEGER
*>         storage spacing between elements of CY
*> \endverbatim
*
*  Authors:
*  ========
*
*> \author Univ. of Tennessee
*> \author Univ. of California Berkeley
*> \author Univ. of Colorado Denver
*> \author NAG Ltd.
*
*> \date November 2017
*
*> \ingroup complex_blas_level1
*
*> \par Further Details:
*  =====================
*>
*> \verbatim
*>
*>     jack dongarra, linpack, 3/11/78.
*>     modified 12/3/93, array(1) declarations changed to array(*)
*> \endverbatim
*>
*  =====================================================================
      SUBROUTINE CAXPY(N,CA,CX,INCX,CY,INCY)
*
*  -- Reference BLAS level1 routine (version 3.8.0) --
*  -- Reference BLAS is a software package provided by Univ. of Tennessee,    --
*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
*     November 2017
*
*     .. Scalar Arguments ..
      COMPLEX CA
      INTEGER INCX,INCY,N
*     ..
*     .. Array Arguments ..
      COMPLEX CX(*),CY(*)
*     ..
*
*  =====================================================================
*
*     .. Local Scalars ..
      INTEGER I,IX,IY
*     ..
*     .. External Functions ..
      REAL SCABS1
      EXTERNAL SCABS1
*     ..
      IF (N.LE.0) RETURN
      IF (SCABS1(CA).EQ.0.0E+0) RETURN
      IF (INCX.EQ.1 .AND. INCY.EQ.1) THEN
*
*        code for both increments equal to 1
*
         DO I = 1,N
            CY(I) = CY(I) + CA*CX(I)
         END DO
      ELSE
*
*        code for unequal increments or equal increments
*          not equal to 1
*
         IX = 1
         IY = 1
         IF (INCX.LT.0) IX = (-N+1)*INCX + 1
         IF (INCY.LT.0) IY = (-N+1)*INCY + 1
         DO I = 1,N
            CY(IY) = CY(IY) + CA*CX(IX)
            IX = IX + INCX
            IY = IY + INCY
         END DO
      END IF
*
      RETURN
      END

Go code:

package main

//*> \brief \b CAXPY
//*
//*  =========== DOCUMENTATION ===========
//*
//* Online html documentation available at
//*            http://www.netlib.org/lapack/explore-html/
//*
//*  Definition:
//*  ===========
//*
//*       SUBROUTINE CAXPY(N,CA,CX,INCX,CY,INCY)
//*
//*       .. Scalar Arguments ..
//*       COMPLEX CA
//*       INTEGER INCX,INCY,N
//*       ..
//*       .. Array Arguments ..
//*       COMPLEX CX(*),CY(*)
//*       ..
//*
//*
//*> \par Purpose:
//*  =============
//*>
//*> \verbatim
//*>
//*>    CAXPY constant times a vector plus a vector.
//*> \endverbatim
//*
//*  Arguments:
//*  ==========
//*
//*> \param[in] N
//*> \verbatim
//*>          N is INTEGER
//*>         number of elements in input vector(s)
//*> \endverbatim
//*>
//*> \param[in] CA
//*> \verbatim
//*>          CA is COMPLEX
//*>           On entry, CA specifies the scalar alpha.
//*> \endverbatim
//*>
//*> \param[in] CX
//*> \verbatim
//*>          CX is COMPLEX array, dimension ( 1 + ( N - 1 )*abs( INCX ) )
//*> \endverbatim
//*>
//*> \param[in] INCX
//*> \verbatim
//*>          INCX is INTEGER
//*>         storage spacing between elements of CX
//*> \endverbatim
//*>
//*> \param[in,out] CY
//*> \verbatim
//*>          CY is COMPLEX array, dimension ( 1 + ( N - 1 )*abs( INCY ) )
//*> \endverbatim
//*>
//*> \param[in] INCY
//*> \verbatim
//*>          INCY is INTEGER
//*>         storage spacing between elements of CY
//*> \endverbatim
//*
//*  Authors:
//*  ========
//*
//*> \author Univ. of Tennessee
//*> \author Univ. of California Berkeley
//*> \author Univ. of Colorado Denver
//*> \author NAG Ltd.
//*
//*> \date November 2017
//*
//*> \ingroup complex_blas_level1
//*
//*> \par Further Details:
//*  =====================
//*>
//*> \verbatim
//*>
//*>     jack dongarra, linpack, 3/11/78.
//*>     modified 12/3/93, array(1) declarations changed to array(*)
//*> \endverbatim
//*>
//*  =====================================================================
func CAXPY(N *int, CA *complex128, CX *[]complex128, INCX *int, CY *[]complex128, INCY *int) {
	I := new(int)
	IX := new(int)
	IY := new(int)
	//*
	//*  -- Reference BLAS level1 routine (version 3.8.0) --
	//*  -- Reference BLAS is a software package provided by Univ. of Tennessee,    --
	//*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
	//*     November 2017
	//*
	//*     .. Scalar Arguments ..
	//*     ..
	//*     .. Array Arguments ..
	//*     ..
	//*
	//*  =====================================================================
	//*
	//*     .. Local Scalars ..
	//*     ..
	//*     .. External Functions ..
	//*     ..
	if (*(N)) <= 0 {
		return
	}
	if (*SCABS1((CA))) == 0.0e+0 {
		return
	}
	if (*(INCX)) == 1 && (*(INCY)) == 1 {
		//*
		//*        code for both increments equal to 1
		//*
		for (*I) = 1; (*I) <= (*(N)); (*I)++ {
			(*(CY))[(*I)-(1)] = (*(CY))[(*I)-(1)] + (*(CA))*(*(CX))[(*I)-(1)]
		}
	} else {
		//*
		//*        code for unequal increments or equal increments
		//*          not equal to 1
		//*
		(*IX) = 1
		(*IY) = 1
		if (*(INCX)) < 0 {
			(*IX) = (-(*(N))+1)*(*(INCX)) + 1
		}
		if (*(INCY)) < 0 {
			(*IY) = (-(*(N))+1)*(*(INCY)) + 1
		}
		for (*I) = 1; (*I) <= (*(N)); (*I)++ {
			(*(CY))[(*IY)-(1)] = (*(CY))[(*IY)-(1)] + (*(CA))*(*(CX))[(*IX)-(1)]
			(*IX) = (*IX) + (*(INCX))
			(*IY) = (*IY) + (*(INCY))
		}
	}
	//*
	return
}

Notes

Fortran 77 Golang
all arguments of function are pointers ?
all arguments of intrisic function are pointers ?
all internal function variables are pointers ?

IDENT:

  • constants
  • arrays, matrixes

Operations:

  • assign
  • initialization
  • boolean

Fortran test sources

Issues
  • f4go fails to transpile PYTHIA

    f4go fails to transpile PYTHIA

    I tried to transpile a CERN-based FORTRAN77 code used to simulate high energy physics processes:

    • http://home.thep.lu.se/~torbjorn/pythia6/pythia6428.f

    but the transpilation processes failed. here are a couple of the error messages:

    $> curl -O -L http://home.thep.lu.se/~torbjorn/pythia6/pythia6428.f
    $> f4go ./pythia6428.f
    [...]
    pythia6428.f : Parsing error : Cannot identify token in left part separation :, in MIN ( 1e0 , MAX ( PARJ ( 129 ) , ( 2e0 * PARU ( 112 ) / ECM ) ** 2 ) )
    
    [...]
    pythia6428.f : Parsing error : Recover parseStmt pos{{54565 7}}: Not acceptable type : X ( 1 )
    [...]
    

    some of these errors may come from the use of IMPLICIT, though.

    opened by sbinet 2
  • cleanup f4go. add logging facilities. better intrinsics

    cleanup f4go. add logging facilities. better intrinsics

    Hey, thought you could use some improvements to logging since running f4go in parallel usually spits out too much data to meaningfully process and no trace of which file was being processed when panic happened. Please take a look!

    opened by soypat 1
  • Transpiling MYSTRAN to Go

    Transpiling MYSTRAN to Go

    I intend to transpile this Finite Element Analysis program from FORTRAN to Go:

    https://github.com/dr-bill-c/MYSTRAN

    Due to the complexity of MYSTRAN code structure, I have a difficult time to do so. I wonder if there is any example of transpiling a large project from FORTRAN to Go. So that I can refer to the example to get started. Thanks :)

    opened by Megidd 0
  • Better README - Project Motivation?

    Better README - Project Motivation?

    Hi,

    I just learned that FORTRAN is faster than C code, but I am not sure what is the motivation or goal of this project. Would be nice if the readme file could be updated for clueless people like me!

    Thanks!

    opened by einthusan 1
  • missing support for EQUIVALENCE statement

    missing support for EQUIVALENCE statement

    hi,

    I was trying out transpiling one last remnant of a FORTRAN dependency from CERN: CERNLIB, and more precisely its ZEBRA library.:

    $> curl -O -L https://raw.githubusercontent.com/root-project/root/master/misc/minicern/src/zebra.f
    $> f4go -p minicern ./zebra.f
    [...]
    Scan: end of postprocessor
               ./zebra.f : Parsing error :  EQUIVALENCE ( CQLETT ( 1 ) , CQALLC ( 1 : 1 ) )
               ./zebra.f : Parsing error :  EQUIVALENCE ( CQNUM ( 1 ) , CQALLC ( 27 : 27 ) )
    [...]
               ./zebra.f : Parsing error :  EQUIVALENCE ( IQTABV ( 1 ) , LQPSTO )
               ./zebra.f : Parsing error :  EQUIVALENCE ( LQRS , LQSYSS ( 7 ) )
    
    opened by sbinet 2
Owner
Konstantin
Konstantin
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