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ASSEMBLY & COMPILE TOOLS/PLM VAX COMPILER/plmvax/block.for
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119
ASSEMBLY & COMPILE TOOLS/PLM VAX COMPILER/plmvax/block.for
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C***********************************************************************
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C
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C BLOCK.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 handles block entries
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C and exits.
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C
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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 16OCT81 Alex Hunter 1. Added disclaimer notice.
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C 14NOV81 Alex Hunter 1. Avoid unnecessary jump if no path. (V6.2)
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C 2. Copy symbol serial no. and psect fields.
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C
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C***********************************************************************
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SUBROUTINE BLOCK_BEGIN
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INCLUDE 'PLMCOM.FOR/NOLIST'
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C
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IF (BLOCK_LEVEL.GE.BLOCK_MAX)
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# CALL FATAL('BLOCKS NESTED TOO DEEPLY')
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BLOCK_LEVEL=BLOCK_LEVEL+1
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SYMBOL_TOP(BLOCK_LEVEL)=SYMBOL_TOP(BLOCK_LEVEL-1)
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MEMBER_TOP(BLOCK_LEVEL)=MEMBER_TOP(BLOCK_LEVEL-1)
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PARAM_TOP(BLOCK_LEVEL)=PARAM_TOP(BLOCK_LEVEL-1)
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STRINGS_TOP(BLOCK_LEVEL)=STRINGS_TOP(BLOCK_LEVEL-1)
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RETURN
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C
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C---------------------------
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ENTRY BLOCK_END
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C---------------------------
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IF (BLOCK_LEVEL.EQ.0) CALL BUG('BLOCK LEVEL UNDERFLOW')
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DO 10 I=SYMBOL_TOP(BLOCK_LEVEL),SYMBOL_TOP(BLOCK_LEVEL-1)+1,-1
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H=HASH(SYMBOL_PLM_ID(I))
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HASH_BUCKET(H)=SYMBOL_CHAIN(I)
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10 CONTINUE
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BLOCK_LEVEL=BLOCK_LEVEL-1
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C---------- HANDLE UNRESOLVED LABELS AND UNDEFINED FORWARD REFS
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DO 40 I=SYMBOL_TOP(BLOCK_LEVEL)+1,SYMBOL_TOP(BLOCK_LEVEL+1)
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IF (SYMBOL_REF(I).EQ.S_FORWARD.OR.
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# BLOCK_LEVEL.EQ.0.AND.(SYMBOL_FLAGS(I).AND.S_UNDEF).NE.0) THEN
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CALL ERROR('NEVER GOT DEFINED: '//SYMBOL_PLM_ID(I))
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ELSEIF (SYMBOL_KIND(I).EQ.S_LABEL.AND.
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# (SYMBOL_FLAGS(I).AND.S_UNDEF).NE.0) THEN
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! -- UNRESOLVED LABEL. ----
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DO 20 J=SYMBOL_TOP(BLOCK_LEVEL-1)+1,SYMBOL_TOP(BLOCK_LEVEL)
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IF (SYMBOL_PLM_ID(I).EQ.SYMBOL_PLM_ID(J)) THEN
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IF (SYMBOL_KIND(J).NE.S_LABEL) THEN
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CALL ERROR('GOTO TARGET NOT A LABEL: '//SYMBOL_PLM_ID(I))
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ELSEIF ((SYMBOL_FLAGS(J).AND.S_UNDEF).EQ.0) THEN
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IF (SYMBOL_REF(J).EQ.S_EXT) THEN
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IF (PATH) CALL GENERATE_LOCAL_LABEL(LL)
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IF (PATH) CALL EMIT('BRB '//LOCAL_LABEL(LL,N0))
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CALL EMIT_LABEL(I)
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CALL EMIT('JMP '//SYMBOL_VAX_ID(J))
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IF (PATH) CALL EMIT_LOCAL_LABEL(LL)
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ELSE
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CALL EMIT1(SYMBOL_VAX_ID(I)(:LNB(SYMBOL_VAX_ID(I)))
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# //' = '//
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# SYMBOL_VAX_ID(J)(:LNB(SYMBOL_VAX_ID(J))))
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ENDIF
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ELSE
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SYMBOL_REF(I)=SYMBOL_REF(J)
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SYMBOL_FLAGS(I)=SYMBOL_FLAGS(J).AND..NOT.S_PUBLIC
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GO TO 30
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ENDIF
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GO TO 40
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ENDIF
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20 CONTINUE
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C---------- LABEL STILL UNRESOLVED -- COPY DOWN TO OUTER BLOCK.
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30 SYMBOL_TOP(BLOCK_LEVEL)=SYMBOL_TOP(BLOCK_LEVEL)+1
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IX=SYMBOL_TOP(BLOCK_LEVEL)
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SYMBOL_PLM_ID(IX)=SYMBOL_PLM_ID(I)
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SYMBOL_VAX_ID(IX)=SYMBOL_VAX_ID(I)
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SYMBOL_KIND(IX)=SYMBOL_KIND(I)
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SYMBOL_TYPE(IX)=SYMBOL_TYPE(I)
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SYMBOL_NBR_ELEMENTS(IX)=SYMBOL_NBR_ELEMENTS(I)
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SYMBOL_ELEMENT_SIZE(IX)=SYMBOL_ELEMENT_SIZE(I)
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SYMBOL_LINK(IX)=SYMBOL_LINK(I)
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SYMBOL_LIST_SIZE(IX)=SYMBOL_LIST_SIZE(I)
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SYMBOL_REF(IX)=SYMBOL_REF(I)
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SYMBOL_BASE(IX)=SYMBOL_BASE(I)
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SYMBOL_BASE_MEMBER(IX)=SYMBOL_BASE_MEMBER(I)
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SYMBOL_FLAGS(IX)=SYMBOL_FLAGS(I)
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SYMBOL_SERIAL_NO(IX)=SYMBOL_SERIAL_NO(I)
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SYMBOL_PSECT(IX)=SYMBOL_PSECT(I)
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H=HASH(SYMBOL_PLM_ID(I))
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SYMBOL_CHAIN(IX)=HASH_BUCKET(H)
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HASH_BUCKET(H)=IX
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ENDIF
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40 CONTINUE
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RETURN
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END
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