golang将FORTRAN 77代码转换为Go代码的插件库f4go的使用
Golang将FORTRAN 77代码转换为Go代码的插件库f4go的使用
简介
f4go是一个将FORTRAN 77代码转换为Go代码的工具库。它可以帮助开发者将现有的FORTRAN代码迁移到Go语言环境。
安装和使用
# 安装Golang
# 编译f4go
go get -u github.com/Konstantin8105/f4go
cd $GOPATH/src/github.com/Konstantin8105/f4go
go build
./f4go ./testdata/blas/caxpy.f
# 查看生成的Go代码
less ./testdata/blas/caxpy.go
示例转换
FORTRAN 77原始代码
*> \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
转换后的Go代码
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
}
简化后的Go代码
package main
func CAXPY(N int, CA *complex128, CX []complex128, INCX int, CY []complex128, INCY int) {
var I int
var IX int
var IY int
if N <= 0 {
return
}
if (*SCABS1((CA))) == 0.0e+0 {
return
}
if INCX == 1 && INCY == 1 {
for I = 1; I <= N; I++ {
CY[I-1] = CY[I-1] + CA*CX[I-1]
}
} else {
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
}
注意事项
| FORTRAN 77 | Golang |
|---|---|
| 函数的所有参数都是指针 | ? |
| 内置函数的所有参数都是指针 | ? |
| 所有内部函数变量都是指针 | ? |
IDENT:
- 常量
- 数组和矩阵
操作:
- 赋值
- 初始化
- 布尔运算
FORTRAN测试源
- LAPACK from lapack3.8.0
- BOSOR5
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1 回复
更多关于golang将FORTRAN 77代码转换为Go代码的插件库f4go的使用的实战系列教程也可以访问 https://www.itying.com/category-94-b0.html
使用f4go将FORTRAN 77代码转换为Go代码
f4go是一个将FORTRAN 77代码转换为Go代码的工具。它旨在帮助开发者将遗留的FORTRAN代码迁移到现代Go语言环境中。下面我将介绍如何使用f4go以及一些注意事项。
安装f4go
首先需要安装f4go工具：
go get github.com/Konstantin8105/f4go
基本使用方法
将FORTRAN 77文件转换为Go代码的基本命令格式：
f4go input.f output.go
示例转换
假设我们有一个简单的FORTRAN 77程序example.f：
PROGRAM EXAMPLE
INTEGER I, SUM
SUM = 0
DO 10 I = 1, 10
SUM = SUM + I
10 CONTINUE
PRINT *, 'Sum is:', SUM
END
使用f4go转换：
f4go example.f example.go
转换后的Go代码大致如下：
package main
import "fmt"
func main() {
var sum int
var i int
sum = 0
for i = 1; i <= 10; i++ {
sum = sum + i
}
fmt.Printf("Sum is: %d\n", sum)
}
高级用法
- 转换整个目录：
f4go -r ./fortran_src ./go_output
- 保留原始格式：
f4go -comments input.f output.go
注意事项
-
不完全兼容：f4go不能100%完美转换所有FORTRAN 77代码，特别是：
- 复杂的数学函数库
- 特定的I/O操作
- 某些数组处理方式
-
需要手动调整：转换后通常需要手动调整：
- 导入必要的Go包
- 修正数组索引（FORTRAN从1开始，Go从0开始）
- 处理文件I/O差异
-
性能考虑：转换后的代码可能不是最优的Go实现，应考虑重构以获得更好的性能。
复杂示例
FORTRAN子程序：
SUBROUTINE ADD(A, B, C, N)
INTEGER N
REAL A(N), B(N), C(N)
DO 20 I = 1, N
C(I) = A(I) + B(I)
20 CONTINUE
RETURN
END
转换后的Go代码：
func add(a []float32, b []float32, c []float32, n int) {
for i := 0; i < n; i++ {
c[i] = a[i] + b[i]
}
}
替代方案
如果f4go不能满足需求，可以考虑：
- 手动重写关键部分
- 使用CGO调用FORTRAN编译的共享库
- 使用其他转换工具如f2go（针对FORTRAN 90+）
结论
f4go是一个有用的工具，可以显著减少将FORTRAN 77代码迁移到Go的工作量。但对于生产环境，建议在转换后进行彻底的测试和性能优化。转换后的代码通常需要进一步调整才能完全发挥Go语言的优势。
对于大型FORTRAN项目，建议采用逐步迁移策略，先转换非关键模块，验证后再处理核心算法部分。
