Intel(R) Fortran Compiler for Linux* Systems User's Guide Volume I ...

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Intel® Fortran Compiler for Linux* Systems User's Guide Volume I: Building Applications can specify these conventions in a mixed-language interface with the INTERFACE statement or in a data or function declaration. C/C++ and Fortran both pass arguments in order from left to right. 2. The caller routine and the called routine use a calling convention to select the option of passing a variable number of arguments. 3. The caller routine and the called routine use a calling convention to pass arguments by value (values passed) or by reference (addresses passed). Individual Fortran arguments can also be designated with ATTRIBUTES option VALUE or REFERENCE. 4. The caller routine and the called routine use a calling convention to establish naming conventions for procedure names. You can establish any procedure name you want, regardless of its Fortran name, with the ALIAS directive (or ATTRIBUTES option ALIAS). This is useful because C is case-sensitive, while Fortran is not. See these topics: ATTRIBUTES Properties and Calling Conventions Fortran/C Calling Conventions ATTRIBUTES Properties and Calling Conventions The ATTRIBUTES properties (also known as options) C, REFERENCE, VALUE, and VARYING all affect the calling convention of routines. You can specify the: • C, REFERENCE, and VARYING properties for an entire routine • VALUE and REFERENCE properties for individual arguments By default, Fortran passes all data by reference (except the hidden length argument of strings, which is passed by value). If the C property is used, the default changes to passing almost all data except arrays by value. However, in addition to the calling-convention property C, you can specify argument properties VALUE and REFERENCE (to pass arguments by value or by reference), regardless of the calling convention property. Arrays can only be passed by reference. Different Fortran calling conventions can be specified by declaring the Fortran procedure to have certain attributes. Assume this example: INTERFACE SUBROUTINE MY_SUB (I) 182
Intel® Fortran Compiler for Linux* Systems User's Guide, Volume I: Building Applications !DEC$ ATTRIBUTES C, ALIAS:'My_Sub_' :: MY_SUB ! ia32 systems INTEGER I END SUBROUTINE MY_SUB END INTERFACE This code declares a subroutine named MY_SUB with the C property and the external name My_Sub_ set with the ALIAS property. For another example, the following declaration assumes the subroutine is called with the C calling convention: SUBROUTINE CALLED_FROM_C (A) !DEC$ ATTRIBUTES C :: CALLED_FROM_C INTEGER A The following table summarizes the effect of the most common Fortran callingconvention directives: Calling Conventions for ATTRIBUTES Properties Argument Default C C, REFERENCE Scalar Reference Value Reference Scalar [value] Value Value Value Scalar [reference] String Reference Reference Reference Reference, either Len:End or Len:Mixed String(1:1) String [value] Error String(1:1) String(1:1) String [reference] Reference, either No Len or Len:Mixed Reference, No Len Reference, either Len:End or Len:Mixed Reference, No Len Array Reference Reference Reference Array [value] Error Error Error Array Reference Reference Reference [reference] Derived Type Reference Value, size dependent Reference Derived Type [value] Value, size dependent Value, size dependent Value, size dependent 183
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Intel(R) Fortran Compiler for Linux
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Table Of Contents Table Of Contents
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Table Of Contents Predefined Prepro
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Table Of Contents -e90 or -e95 ....
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Table Of Contents -[no]fpconstant .
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Table Of Contents -noinclude ......
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Table Of Contents -par_threshold n.
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Table Of Contents Using Debugger Co
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Table Of Contents Limitations of Nu
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Table Of Contents Specifiers for Fi
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Table Of Contents Programming with
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Table Of Contents Run-Time Message
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About the Intel® Fortran Compiler
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Intel® Fortran Compiler for Linux*
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Index ! !DEC$ prefix ..............
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Index -assume dummy_aliases compile
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Index common blocks allocating ....
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Index compiler option -convert meth
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Index additional...................
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Index file information OPEN stateme
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Index FOR$IOS_FLTOVF error message
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Index FOR$IOS_TOOMANREC error messa
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Index -fvisibility-keyword compiler
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Index -ip_no_pinlining compiler opt
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Index manuals additional...........
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Index -nus compiler option.........
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Index -pad_source compiler option..
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Index record characteristics OPEN s
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Index signal routine calling ......
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Index uninstall.sh file ...........
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Intel(R) Fortran Compiler for Linux* Systems User's Guide Volume I ...

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