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                                                   File Number S360-26
                                                   Order No. GC33-8000-0
                                                             y




                                                   Program Logic




OS ALGOL (F) Compiler Logic
                 I
Program Numbers: 360S-AL-531 (Compiler)
                 360S- LM-532 (Library Routines)
OS Release 21


This manual describes the internal logic of the
ALGOL (F) Compiler. It is intended for the use
of IBM field engineers, systems analysts and
programmers.

The ALGOL (F) Compiler is a processing program
of the IBM System/360 Operating System. It
translates a source module written in the ALGOL
language into an object module that can be
processed into an executable load module by the
Linkage Editor.
Page of GY'l3-8000-0
Revised January 15, 1972
By TNL GN33-8129


 PREFACE




 The IBM System/360 Operating System ALGOL                 handles the output of diagnostic messages
 Compiler consists of ten phases, or load                  in the three phases mentioned, is described
 modules. Chapter 1 of this manual provides                in Chapter 9.
 an introductory survey of the main
 functions of the several phases. A more                      Chapter 10 describes the ALGOL Library,
 detailed description of the individual                    which consists of a set of load modules
 phases is provided in the subsequent chap-                representing standard I/O procedures,
 ters, as follows:                                         mathematical functions, and the Fixed Stor-
                                                           age Area.
 Directory (IEXOO)                     Chapter 2
 Initialization (IEX10)                Chapter 3              Chapter 11 describes the composition of
 Scan I/II (IEXll)                     Chapter 4           the object module generated by the Compiler,
 Identifier Table Manipulation                             and the organization of the load module at
  (IEX20)                              Chapter   5         execution time.
 Diagnostic Output (IEX21)             Chapter   9
 Scan III (IEX30)                      Chapter   6            Other publications that will be useful
 Diagnostic Output (IEX31)             Chapter   9         to the reader in understanding the Compiler
 Subscript Handling (IEX40)            Chapter   7         are:
 Compilation Phase (IEXSO)             Chapter   8
 Termination Phase (IEXS1)             Chapter   8               OS ALGOL Language, Order No.GC28-661S

    Two of the phases (Load Modules IEX21                        OS ALGOL Programmer's Guide,
 and IEX31) are devoted exclusively to the                       Order No. GC33-4000
 editing and output of diagnostic messages.
 Diagnostic output is also provided for in                       OS FORTRAN IV Library, Order No.
 the Termination Phase (Load Module IEXS1).                      Order No. GC28-6S96
 The Error Message Editing Routine, which




First Edition (September 1967)

This edition applies to release 21 of the IBM System/360
Operating System, and to all subsequent modifications unless
otherwise indicated in new editions or Technical Newsletters.
Changes are continually made to the specifications herein;
before using this publication in connection with the operation
of IBM systems, consult the latest SRL Newsletter, Order No.
GN20-0360 for the editions that are applicable and current.

  This publication was prepared for production using an IBM
computer to update the text and to control the page and line
format. Page impressions for photo-offset printing were ob-
tained from an IBM 1403 printer using a special print chain.

  Requests for copies of IBM publications should be made to
your IBM representative or to the IBM branch office serving
your locality.

  A form is provided at the back of this publication for
reader's comments. If the form has been removed, comments
may be addressed to IBM Nordic Laboratory, Publications
Development, Box 962, S-181 09 Lidingo 9, Sweden. Comments
become the property of IBM.




 

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