Upload

Digital Research

ASSEMBLY & COMPILE TOOLS/PLM VAX COMPILER/plmvax/push.for

@@ -0,0 +1,74 @@
+C***********************************************************************
+C
+C                               PUSH.FOR
+C
+C
+C		D I S C L A I M E R   N O T I C E		      
+C		-------------------   -----------
+C
+C  This document and/or portions of the material and data furnished
+C  herewith, was developed under sponsorship of the U. S. Government.
+C  Neither the U.S. nor the U.S.D.O.E., nor the Leland Stanford Junior
+C  University, nor their employees, nor their respective contractors,
+C  subcontractors, or their employees, makes any warranty, express or
+C  implied, or assumes any liability or responsibility for accuracy,
+C  completeness or usefulness of any information, apparatus, product
+C  or process disclosed, or represents that its use will not infringe
+C  privately-owned rights.  Mention of any product, its manufacturer,
+C  or suppliers shall not, nor is it intended to, imply approval, dis-
+C  approval, or fitness for any particular use.  The U. S. and the
+C  University at all times retain the right to use and disseminate same
+C  for any purpose whatsoever.  Such distribution shall be made by the
+C  National Energy Software Center at the Argonne National Laboratory
+C  and only subject to the distributee furnishing satisfactory proof
+C  that he has a valid license from the Intel Corporation in effect.
+C
+C
+C-----------------------------------------------------------------------
+C
+C    This module of the PL/M-VAX compiler implements the pushdown
+C    stacks used by recursive FORTRAN subroutines and functions.
+C
+C-----------------------------------------------------------------------
+C		R E V I S I O N   H I S T O R Y
+C
+C    20OCT81  Alex Hunter  1. Added disclaimer notice. (V5.4)
+C
+C-----------------------------------------------------------------------
+      SUBROUTINE PUSH(DATA,NWORDS)
+      IMPLICIT INTEGER*2 (A-Z)
+      INTEGER*2 DATA(*), SP, STACK(1000)
+      DATA SP/0/
+C
+      IF (SP+NWORDS.GT.1000) CALL FATAL('SYNTAX STACK OVERFLOW')
+      DO 10 I=1,NWORDS
+         STACK(SP+I) = DATA(I)
+10    CONTINUE
+      SP = SP+NWORDS
+      RETURN
+C------------------------------------------
+      ENTRY POP(DATA,NWORDS)
+      SP = SP-NWORDS
+      IF (SP.LT.0) CALL BUG('SYNTAX STACK UNDERFLOW')
+      DO 20 I=1,NWORDS
+         DATA(I) = STACK(SP+I)
+20    CONTINUE
+      RETURN
+      END
+C------------------------------------------
+      SUBROUTINE PUSHC(CHARS)
+      IMPLICIT INTEGER*2 (A-Z)
+      CHARACTER CHARS*(*), CSTACK(100)*32
+      DATA SP/0/
+C
+      IF (SP.GE.100) CALL FATAL('CHAR STACK OVERFLOW')
+      SP=SP+1
+      CSTACK(SP)=CHARS
+      RETURN
+C------------------------------------------
+      ENTRY POPC(CHARS)
+      IF (SP.LE.0) CALL BUG('CHAR STACK UNDERFLOW')
+      CHARS=CSTACK(SP)
+      SP=SP-1
+      RETURN
+      END