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ASSEMBLY & COMPILE TOOLS/PLM VAX COMPILER/plmvax/units.for
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134
ASSEMBLY & COMPILE TOOLS/PLM VAX COMPILER/plmvax/units.for
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C***********************************************************************
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C
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C UNITS.FOR
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C
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C
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C D I S C L A I M E R N O T I C E
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C ------------------- -----------
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C
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C This document and/or portions of the material and data furnished
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C herewith, was developed under sponsorship of the U. S. Government.
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C Neither the U.S. nor the U.S.D.O.E., nor the Leland Stanford Junior
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C University, nor their employees, nor their respective contractors,
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C subcontractors, or their employees, makes any warranty, express or
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C implied, or assumes any liability or responsibility for accuracy,
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C completeness or usefulness of any information, apparatus, product
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C or process disclosed, or represents that its use will not infringe
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C privately-owned rights. Mention of any product, its manufacturer,
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C or suppliers shall not, nor is it intended to, imply approval, dis-
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C approval, or fitness for any particular use. The U. S. and the
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C University at all times retain the right to use and disseminate same
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C for any purpose whatsoever. Such distribution shall be made by the
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C National Energy Software Center at the Argonne National Laboratory
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C and only subject to the distributee furnishing satisfactory proof
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C that he has a valid license from the Intel Corporation in effect.
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C
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C
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C-----------------------------------------------------------------------
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C
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C This module of the PL/M-VAX compiler contains routines to process
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C one or a series of statement units, including any labels associated
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C with each statement unit.
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C
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C-----------------------------------------------------------------------
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C R E V I S I O N H I S T O R Y
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C
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C 20OCT81 Alex Hunter 1. Added disclaimer notice. (V5.4)
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C 21OCT81 Alex Hunter 1. Basic block analysis. (V5.5)
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C 09NOV81 Alex Hunter 1. Implement BBA assumption. (V5.9)
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C 14NOV81 Alex Hunter 1. Put FPSP. in P_APD psect. (V6.2)
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C
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C-----------------------------------------------------------------------
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SUBROUTINE UNITS
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INCLUDE 'PLMCOM.FOR/NOLIST'
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CHARACTER*32 TEMP_ID
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CALL PSECT(P_CODE)
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FLAG=1
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GO TO 10
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C------------------------------
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ENTRY UNIT
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C------------------------------
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FLAG=2
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10 CALL PUSH(FLAG,1)
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TEMP_ID=IDENTIFIER
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IF (NLABELS.NE.0) CALL BREAK
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DO 18 I=1,NLABELS
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IDENTIFIER=LABELS(I)
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H=HASH(IDENTIFIER)
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SYMBOL_INDEX=HASH_BUCKET(H)
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12 IF (SYMBOL_INDEX.GT.SYMBOL_TOP(BLOCK_LEVEL-1)) THEN
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IF (SYMBOL_PLM_ID(SYMBOL_INDEX).EQ.IDENTIFIER) GO TO 14
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SYMBOL_INDEX=SYMBOL_CHAIN(SYMBOL_INDEX)
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GO TO 12
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ENDIF
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C----------- NO ENTRY AT THIS BLOCK LEVEL -- MAKE ONE.
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CALL ENTER_SYMBOL
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SYMBOL_KIND(SYMBOL_INDEX)=S_LABEL
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14 SYMBOL_INDEX=HASH_BUCKET(H)
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16 IF (SYMBOL_INDEX.GT.SYMBOL_TOP(BLOCK_LEVEL-1)) THEN
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IF (SYMBOL_PLM_ID(SYMBOL_INDEX).EQ.IDENTIFIER) THEN
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IF (SYMBOL_KIND(SYMBOL_INDEX).NE.S_LABEL) THEN
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CALL ERROR('ALREADY DECLARED NOT A LABEL: '//IDENTIFIER)
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ELSEIF ((SYMBOL_FLAGS(SYMBOL_INDEX).AND.S_UNDEF).EQ.0) THEN
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CALL ERROR('MULTIPLY DEFINED LABEL: '//IDENTIFIER)
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ELSE
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SYMBOL_REF(SYMBOL_INDEX)=S_STATIC
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SYMBOL_FLAGS(SYMBOL_INDEX)=SYMBOL_FLAGS(SYMBOL_INDEX)
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# .AND..NOT.S_UNDEF
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CALL EMIT_LABEL(SYMBOL_INDEX)
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ENDIF
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ENDIF
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SYMBOL_INDEX=SYMBOL_CHAIN(SYMBOL_INDEX)
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GO TO 16
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ENDIF
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18 CONTINUE
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IDENTIFIER=TEMP_ID
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IF (NLABELS.GT.0) THEN
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LAST_LABEL=LABELS(NLABELS)
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PATH=.TRUE.
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IF (BLOCK_LEVEL.EQ.1) THEN
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CALL EMIT('MOVQ FPSP.,FP')
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IF (MODEL.EQ.1 .OR. MODEL.EQ.3) CALL EMIT('MOVAB S.,R10')
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ENDIF
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ELSE
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LAST_LABEL='.BLANK.'
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ENDIF
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NLABELS=0
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IF (.NOT.PATH.AND.TT.NE.K_END) THEN
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CALL WARN('NO PATH TO THIS STATEMENT')
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CALL BREAK
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PATH=.TRUE.
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ENDIF
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IF (TT.EQ.K_IF) THEN
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CODE=CONDITIONAL_CLAUSE(0)
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ELSEIF (TT.EQ.K_DO) THEN
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CODE=DO_BLOCK(0)
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ELSEIF (TT.EQ.ID) THEN
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CODE=ASSIGNMENT_STATEMENT(0)
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ELSEIF (TT.EQ.K_CALL) THEN
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CODE=CALL_STATEMENT(0)
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ELSEIF (TT.EQ.K_GO.OR.TT.EQ.K_GOTO) THEN
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CODE=GOTO_STATEMENT(0)
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ELSEIF (TT.EQ.K_RETURN) THEN
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CODE=RETURN_STATEMENT(0)
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ELSEIF (TT.EQ.K_DISABLE.OR.TT.EQ.K_ENABLE.OR.TT.EQ.K_HALT) THEN
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CODE=i8086_DEPENDENT_STATEMENTS(0)
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ELSEIF (TT.EQ.D_SEMI) THEN
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CODE=NULL
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CALL GETTOK
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ELSE
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CALL POP(FLAG,1)
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IF (FLAG.EQ.2) CALL MUSTBE(NT_STATEMENT)
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RETURN
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ENDIF
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IF (CODE.NE.NULL) THEN
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BASIC_BLOCK=MAKE_NODE(OP_THEN,BASIC_BLOCK,CODE,0,0,0)
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ENDIF
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IF (END_OF_BASIC_BLOCK .OR. .NOT.ASSUME_BBA) CALL BREAK
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CALL POP(FLAG,1)
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GO TO (10,20), FLAG
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20 RETURN
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END
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