TOPS-20 PASCAL Language Manual - Bitsavers

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DIFFERENCES BETWEEN PASCAL-20 AND VAX-II P~SCAL Table F-2 lists additional predeclared functions that VAX-II PASCAL provides but P~SCAL-~O does not: Table F-2: Additional Predeclared Functions Category Function Boolean Transfer UFB(f) DBLE(x) QUAD (x) UINT(x) UROUND (r) UTRUNC (r) Dynamic Allocation Character String Un signed Allocation Size Low Level Interlocked Miscellaneous ADDRESS(x) INDEX(sl,s2) LENGTH(s) PAD(s,fill,l) SUBSTR(s,b,l) UNAD(ul,u2) UNOT (u) UOR(ul,u2) UXOR(ul,u2) SIZE(x,cl, ... ,cn) NEXT (x) BITSIZE(x) BITl\JEXT (x) ADD INTERLOCKED(e,v) SET-INTERLOCKED(b) CLEAR INTERLOCKED(b) STATUS (f) If you plan to transport VAX-II PASCAL programs to TOPS-20, or PASCAL-20 programs to VAX/V~1S, note the following: • The precision for INTEGER data type: TOPS-20 VAX/VMS ( .- 2 * * ~ 5 ) t h r 0 ug h ( + 2 * * 3 5 ) -1 -34~59738368 through +34359738367 (-2**31)+1 through (+2**31)-1 -2147483647 through +2147483647 • The maximum number of items in an enumerated type: TOPS-20 Depends on amount of memory available VAX/VMS 65,535 • PASCAL-20 has two procedures MARK and RELEASE that are used in conjunction with NEW and DISPOSE. VAX-II PASCAL does not have MARK and RELEASE. If you have any further questions concerning VAX-II PASCAL, the VAX-II PASCAL documentation set. refer to F-4
APPENDIX G PROCEDURE AND FUNCTION CALLING SEQUENCES This appendix] describes the calling sequences and conventions used by PASCAL for user-defined procedures and functions. is particularly useful in writing MACRO routines that This information interface with PASCAL programs. Note that, in this appendix, procedures and functions. explicitJy noted. the word Exceptions "procedure" refers to both in the case of functions are G.I RUN-TIME STACK The majority of ~un-time information is kept on the stack; in particular, the stack contains all local variables, parameters, static and dynamic links, and return addresses for procedure calls. The stack pointer is kept in AC 17. A frame pointer, used for most variable accessing, is kept in AC 16. The frame pointer is fixed over the course of a procedure, while the stack pointer can change. Figure G-l shows the status of the stack just after a PUSHJ to a procedure. =======~================== 1111111I111111111111111111 AC 0 -) I previous stack frame I 1111111I111111111111111111 (-- ACl7 -) =========~==================== I I parameter values, I I addresses, descriptors I I =======~================== I I saved stack pointer )-- =======~================== I caller's return addressl =======~================== Figure G-l: Status of Stack After PUSHJ The information in this appendix is copyrighted by Scott Arthur Moody @ 1982. G-I
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TOPS-20 PASCAL Language Manual AA-L
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CONTENTS PREFACE CHAPTER 1 INTRODUC
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7 • 1 . 1 7 . 1 . 2 7 • 1 . 3 7
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G-l G-2 G-3 G-4 Status of Stack Aft
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• Appendix A lists the various me
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CHAPTER I INTRODUCTION PASCAL-20 is
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PROGRAM Calculator (INPUT, OUTPUT);
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INTRODUCTION 1.1.6 Compilation Unit
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INTRODUCTION 1.2.3 Identifiers PASC
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INTRODUCTION The semicolon and the
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INTRODUCTION In the following examp
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CHAPTER 2 PASCAL DATA TYPES This ch
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PASCAL DATA TYPES In addition to de
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PASCAL DATA TYPES You can use strin
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PASCAL DATA TYPES The base type can
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PASCAL DATA TYPES is BOOLEAN, then
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PASCAL DATA TYPES In the three-dime
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PASCAL DATA TYPES To assign values
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PASCAL DATA TYPES 2.3.1.5 Array Exa
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PASCAL DATA TYPES The fields in thi
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PASCAL DATA TYPES 2.3.2.2 Assigning
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PASCAL DATA TYPES For example, assu
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PASCAL DATA TYPES Sets are compatib
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PASCAL DATA TYPES Example 3 F I 1..
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PASCAL DATA TYPES Pointer type defi
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PASCAL DATA TYPES Example 2 VAR Cit
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EXPRESSIONS Table 3-1: Arithmetic O
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EXPRESSIONS TabJe 1-2: Result Types
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EXPRESSIONS The set operators (+, *
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EXPRESSIONS PROGRAM Level_.O (IN PU
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CHAPTEH 4 PROGRAM HEADING AND DECLA
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PROGRAM HEADING AND DECLARATION SEC
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PASCAL STATEMENTS Simple and compou
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PASCAL STATEMENTS Example q Ase~5 :
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PASCAL STATEMENTS The objects of th
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PASCAL STATEMENTS Example 1 CASE EN
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PASCAL STATE~ENTS Example 4 := 1 TO
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PASC~L STATEMENTS 5.5 THE WITH STAT
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PASCAL STATEMENTS Example FOR I :=
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CHAPTER ~ PROCEDURES AND FUNCTIONS
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PROCEDURES AND FUNCTIONS Table ~-l:
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PROCEDURES AND FUNCTIONS Table ~-1:
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PROCEDURES AND FUNCTIONS This progr
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PROCEDURES AND FUNCTIONS You can al
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PROCEDURES AND FUNCTIONS This progr
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PROCEDURES AND FUNCTIONS Boolean fu
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PROCEDURES AND FUNCTIONS Table h-3:
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PROCEDURES AND FUNCTIONS Data items
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PROCEDURES AND FUNCTIONS The actual
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PROCEDURES AND FUNCTIONS An optiona
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PROCEDURES AND FUNCTIONS Example 1
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PROCEDURES AND FUNCTIONS Fo rma t 1
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PROCEDURES AND FUNCTIONS As a resul
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PROCEDURES AND FUNCTIONS label sect
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PROCEDURES AND FUNCTIONS The functi
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PROCEDURES AND FUNrTIONS Example 1
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CHAPTER 7 INPUT AND OUTPUT This cha
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INPUT AND OUTPUT In executing this
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INPUT AND OUTPUT where: file variab
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INPUT AND OUTPUT When you reach the
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INPUT AND OUTPUT To specify only th
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INPUT AND OUTPUT 7.7.4 Record Type
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INPUT AND OUTPUT This example cause
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INPUT AND OUTPUT 7.9 THE PUT PROCED
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INPUT AND OUTPUT READ does not read
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INPUT AND OUTPUT This program fragm
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INPUT AND OUTPUT You must call REWR
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INPUT AND OUTPUT The following rule
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INPUT AND OUTPUT This example write
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INPUT l\ND OUTPUT Example 1 BEGIN W
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INPUT AND OUTPUT The first referenc
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USING PASCAL ON TOPS-20 8.2 FILE SP
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USING PASCAL ON TOPS-20 After plann
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USING P~SCAL ON TOPS-20 /TAKE The /
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USING PASCAL ON TOPS-20 If you omit
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USING PASCAL ON TOPS-20 The first c
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• AVERAGE SCORE SOURCE LISTING o
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USING PASCAL ON TOPS-20 The compile
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USING PASCAL ON TOPS-20 8.4.6.3 Cro
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USTNG PASCAL ON TOPS-20 Example 3 f
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PASDDT: THE PASCAL-20 DEBUGGER 9.3
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PASDDT: THE PASCAL-?O DEBUGGER cons
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PASDDT: THE PASCAL-20 DEBUGGER As s
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PASDDT: THE PASCAL-20 DEBUGGER Note
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PASDDT: THE PAS~AL-20 DEBUGGER ]. T
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P~SDDT: THE PASCAL-?O DEBUGGER To r
Page 193 and 194: ._------------- Table A-I: Run-time
Page 195 and 196: PASCAL MESSAGES -------------------
Page 197 and 198: PASCAL MESSAGES ? PASOl7 "BEGIN" ex
Page 199 and 200: PASCAL MESSAGES ? PASIOS Sign not a
Page 201 and 202: PASCAL MESSAGES ? PAS130 Expression
Page 203 and 204: PASCAL MESSAGES ? PAS157 Case label
Page 205 and 206: PASCAL MESSAGES ? PAS184 External p
Page 207 and 208: PASCAL MESSAGES ? PAS?II Incorrect
Page 209 and 210: PASCAL MESSAGES ? PAS253 Too many a
Page 211: PASCAL MESSAGES % PAS457 Nonstandar
Page 214 and 215: ASCII CHARACTER SET Table 8-1: The
Page 217 and 218: APPENDIX C SYNTAX SUMMARY This appe
Page 219 and 220: SYNTAX Sm1MARY ::= I I I I
Page 221 and 222: SYNTAX Sur~MARY ::= := ::= I
Page 223 and 224: SYNTAX SU~1MARY ::= ft ::= ::=
Page 225: SYNTAX SUr-1MARY ""= ::= ,
Page 228 and 229: -------- ---- ---- ----------------
Page 230 and 231: ISO COMPLIANCE 4. A program paramet
Page 232 and 233: ISO CO~PLIANCE The DISPOSE procedur
Page 234 and 235: ISO COMPLIANCE In the UNPACK(z,i. ,
Page 236 and 237: ISO COMPLIANCE In a FOR statement,
Page 239 and 240: APPENDIX F DIFFERENCES BETWEEN PASC
Page 241: DIFFERENCES BETWEEN PASCAL-20 AND V
Page 245 and 246: PROCEDURE AND FUNCTION CALLING SEQU
Page 247 and 248: PROCEDURE ~ND FUNCTION CALLING SEQU
Page 249 and 250: INDEX /ABORT switch, 8-7 ABS functi
Page 251 and 252: Function (Cont.) EOF, 1-7, 6-14 EOL
Page 253: INDEX (Co n t. ) Set operator, 1-8,
Page 256: - Do Not Tear - Fold Here and Tape
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