HP 3000 Manuals HP 3000 Manuals
Compiling, Linking, and Running Your Program To make your HP Pascal program a valid MPE/iX process, you must compile, link, and run it. The HP Pascal compiler compiles your source program, which is in a textfile. It translates your source code to binary form and stores it in an object file or in an RL. The MPE/iX linker prepares the object file for execution by binding the procedures in the object modules together and defining the initial requirements of the user data stack. The MPE/iX operating system allocates space for the program, binds its external routines to it, and runs it. (The external routines are in executable libraries). Additionally, the compiler looks for a system-wide file called PASCNTL.PUB.SYS. If the file exists and is not empty, the compiler opens and reads the file.[REV BEG] The file should contain only compiler options[REV END] and comments. If there is anything else in the file, the compiler emits an error message. If the file is empty, which is the default, the compiler does not attempt to open it. For more information on the system-wide file, refer to the section on compiler options in the HP Pascal/iX Reference Manual. Figure A-1 shows how a source program (in a textfile) becomes a running program on MPE/iX. [REV BEG]Figure A-1. How Source Code Becomes a Running Program on MPE/iX [REV END] This section explains: * The MPE/iX command files that perform the steps shown in Figure A-1 . * How to run the HP Pascal compiler with the MPE/iX command :RUN PASCALXL.PUB.SYS. * How to pass run-time parameters to your program. Command Files Table A-10 shows the MPE/iX command files that you can use to perform the steps shown in Figure A-1 . Each command or command file in the right-hand column of Table A-1 performs the step or steps in the left-hand column (for example, the command :PASXL performs the compilation step, the command :PASXLLK performs the compilation and linking steps, and the command :PASXLGO performs the compilation, linking, and running steps). Table A-10. MPE/iX Command Files That Compile, Link, and Run a Program ------------------------------------------------------------------- | | | | Steps | MPE/iX Commands | | | or Command Files | | | | ------------------------------------------------------------------- | | | | To Compile | :PASXL | | | | ------------------------------------------------------------------- | | | | To Link | :LINK | | | | ------------------------------------------------------------------- | | | | To Run | :RUN | | | | ------------------------------------------------------------------- | | | | To Compile and Link | :PASXLLK | | | | ------------------------------------------------------------------- | | | | To Compile, Link, and Run | :PASXLGO | | | | ------------------------------------------------------------------- If you plan on linking as a separate step and would like more information on linking, refer to the HP Link Editor/XL Reference Manual. Table A-11 gives the MPE/iX command files that are equivalent to the MPE V commands PASCAL, PASCALPREP, and PASCALGO. (Each command file name has group "pub" and account "sys"--see "File Names" .) Table A-11. Equivalent MPE V Commands and MPE/iX Command Files ------------------------------------------------------------------- | | | | MPE V Command | MPE/iX Command File | | | | ------------------------------------------------------------------- | | | | :PASCAL | :PASXL | | | | ------------------------------------------------------------------- | | | | :PASCALPREP | :PASXLLK | | | | ------------------------------------------------------------------- | | | | :PASCALGO | :PASXLGO | | | | ------------------------------------------------------------------- Syntax PASXL [textfile][,[objectfile][,[listfile][,libfile]]][; INFO="options"] PASXLLK [textfile][,[progfile][,[listfile][,libfile]]][; INFO="options"] PASXLGO [textfile][,[listfile][,libfile]][; INFO="options"] Parameters textfile The name of the textfile that contains the source code to be compiled. If you are running HP Pascal from your terminal, textfile is usually a file, but the default is $STDIN. $STDIN is the current input device, usually your terminal. When textfile is the terminal, you can enter source code interactively in response to the prompt ">." When you have entered every line of your source code, type a colon (:) in response to the prompt. The source code to be compiled can be either a program or a list of modules. A list of modules has the syntax: module1[; module2 [; ... [; modulen]]... ] where module1 through modulen are module bodies. objectfile The name of the object file or RL on which the compiler writes the binary form of the source code that is in textfile. The default is $OLDPASS or $NEWPASS. listfile The name of the file on which the compiler writes the program listing. It can be any ASCII file. The default is $STDLIST. $STDLIST is usually the terminal if you are running HP Pascal from a terminal; it is usually the job spool file if you are running a batch job. If your terminal is both textfile and listfile, the compiler does not write the program listing on the terminal. If this is a permanent disk file, excess space is released with the CRUNCHED close option. See "Additional Features" earlier in this appendix. If listfile is $NULL or a file other than $STDLIST, the compiler displays lines that contain errors on $STDLIST. options A string of 132 or fewer characters, whose value is a list of compiler options. The compiler encloses the list in dollar signs and inserts it before the first line of code in textfile. The default is the empty string. progfile The name of the program file on which the MPE/iX linker writes the linked program. The default is $NEWPASS. libfile The name of the Pascal library file that the compiler searches if a search path is not specified with the compiler option SEARCH. The default is PASLIB in your group and account. :RUN PASCALXL.PUB.SYS The HP Pascal/XL compiler is a program file named PASCALXL.PUB.SYS. You can use the MPE/iX command :RUN to execute PASCALXL.PUB.SYS (that is, to invoke the HP Pascal/iX compiler). The compiler files and their defaults are: File Default Source file $STDIN Object file $OLDPASS or $NEWPASS Listing file $STDLIST Library file PASLIB To override the defaults: 1. Use the MPE/iX command :FILE to equate the nondefault file with its formal file designator (the :FILE parameter formaldesignator). Use one :FILE command for each nondefault file. 2. Tell the MPE/iX command :RUN which files are not to be defaulted by passing the appropriate value to its PARM parameter. The compiler files and their formal file designators are: Compiler File Formal File Designator Source file PASTEXT Object file PASOBJ Listing file PASLIST Library file PASLIB Table A-12 lists the possible values for the PARM parameter and gives their meanings. Table A-12. PARM Values and Their Meanings --------------------------------------------------------------------------------- | | | | PARM Value | Means "File equations exist for the following | | | files:" | | | | --------------------------------------------------------------------------------- | | | | | | | Object | Listing | Source | | | | | | --------------------------------------------------------------------------------- | | | | | | 0 * | | | | | | | | | --------------------------------------------------------------------------------- | | | | | | 1 | | | * | | | | | | --------------------------------------------------------------------------------- | | | | | | 2 | | * | | | | | | | --------------------------------------------------------------------------------- | | | | | | 3 | | * | * | | | | | | --------------------------------------------------------------------------------- | | | | | | 4 | * | | | | | | | | --------------------------------------------------------------------------------- | | | | | | 5 | * | | * | | | | | | --------------------------------------------------------------------------------- | | | | | | 6 | * | * | | | | | | | --------------------------------------------------------------------------------- | | | | | | 7 | * | * | * | | | | | | --------------------------------------------------------------------------------- * PARM=0 is equivalent to the command :PASXL (without parameters). Example :RUN PASCALXL.PUB.SYS :FILE PASTEXT=Program1 :FILE PASOBJ=Object1 :FILE PASLIST=List1 :FILE PASLIB=Library1 :RUN PASCALXL.PUB.SYS;PARM=7;INFO="TABLES ON" :FILE PASTEXT=Program2 :FILE PASLIST=List2 :RUN PASCALXL.PUB.SYS;PARM=3 :FILE PASLIST=List3 :FILE PASOBJ=Object3 :RUN PASCALXL.PUB.SYS;PARM=6;INFO="TABLES ON,TITLE 'Program 3'" It is an error if you specify in the :RUN command that the compiler not use the default for one of the compiler files, and you do not provide a file equation for that file. Example :FILE PASTEXT=Program2 :FILE PASLIST=List2 :RUN PASCALXL.PUB.SYS;PARM=7 The above command sequence causes the compilation to abort with an error because PARM=7 specifies that the :RUN statement not default the source, listing, or object file and no file equation is provided for the object file. Run-Time Parameters You can pass the run-time parameters PARM and INFO to your program with the RUN command. For each parameter that you want your program to access, you must: * Specify a program parameter in the program heading (the position of the variable is not important). * Declare the program parameter as a global variable. The program parameter that corresponds to PARM must be of type shortint. The program parameter that corresponds to INFO must be of type string or PAC. MPE/iX checks the ranges of the actual program parameters for PARM and INFO if the RANGE compiler option is ON when the compiler encounters the first line of the statement part of the main program. (For more information on the RANGE compiler option, see the HP Pascal/iX Reference Manual.) Example If the progfile named ex1 contains code for the program: PROGRAM example_1 (parm,info); VAR parm : integer; info : PACKED ARRAY [1..255] OF char; BEGIN END. then the command: :RUN ex1; PARM=3; INFO="abc" assigns the value 3 to parm and the value abc to info before executing the program example_1.
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