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Digital Research
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ASSEMBLY & COMPILE TOOLS/PLM VAX COMPILER/plmvax/context.for
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148
ASSEMBLY & COMPILE TOOLS/PLM VAX COMPILER/plmvax/context.for
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C***********************************************************************
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C
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C CONTEXT.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 resolves the signed/unsigned
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C context for all the nodes of a code tree, and performs any implicit
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C context coercions required.
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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 15OCT81 Alex Hunter 1. Added disclaimer notice. (V5.4)
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C 21OCT81 Alex Hunter 1. Add OP_SIGNED and OP_UNSIGNED. (V5.5)
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C
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C-----------------------------------------------------------------------
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SUBROUTINE RESOLVE_CONTEXT(NODX)
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INCLUDE 'PLMCOM.FOR/NOLIST'
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NOD=NODX
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IF (NOD.EQ.NULL) RETURN
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IF (CONSTANT(NOD)) RETURN
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IF (LITERAL(NOD)) RETURN
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IF (REGISTER(NOD)) RETURN
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IF (ATOM(NOD)) THEN
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CALL PUSH(NOD,1)
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CALL RESOLVE_CONTEXT2(ATOM_BASE(NOD))
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CALL POP(NOD,1)
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IF (NODE_CONTEXT(ATOM_BASE(NOD)).EQ.0)
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# CALL SET_CONTEXT(ATOM_BASE(NOD),CX_UNSIGNED)
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CALL PUSH(NOD,1)
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CALL RESOLVE_CONTEXT2(ATOM_SUB(NOD))
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CALL POP(NOD,1)
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IF (NODE_CONTEXT(ATOM_SUB(NOD)).EQ.0)
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# CALL SET_CONTEXT(ATOM_SUB(NOD),CX_UNSIGNED)
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RETURN
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ENDIF
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CALL PUSH(NOD,1)
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CALL RESOLVE_CONTEXT2(OPNODE_OPND1(NOD))
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CALL POP(NOD,1)
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CALL PUSH(NOD,1)
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CALL RESOLVE_CONTEXT2(OPNODE_OPND2(NOD))
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CALL POP(NOD,1)
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IF (OPNODE_OPND1(NOD).EQ.NULL) THEN
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NODE_CONTEXT(NOD)=NODE_CONTEXT(OPNODE_OPND2(NOD))
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RETURN
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ELSEIF (OPNODE_OP(NOD).GT.80.AND.OPNODE_OP(NOD).LT.100) THEN
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NODE_CONTEXT(NOD)=CONTEXT(OPNODE_OP(NOD)-80)
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IF (NODE_CONTEXT(OPNODE_OPND1(NOD)).EQ.0) THEN
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CALL SET_CONTEXT(OPNODE_OPND1(NOD),NODE_CONTEXT(NOD))
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ENDIF
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RETURN
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ELSEIF (OPNODE_OP(NOD).EQ.OP_SIGNED) THEN
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NODE_CONTEXT(NOD)=CX_SIGNED
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IF (NODE_CONTEXT(OPNODE_OPND1(NOD)).EQ.0) THEN
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CALL SET_CONTEXT(OPNODE_OPND1(NOD),CX_SIGNED)
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ENDIF
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OPNODE_OP(NOD)=OP_NOP
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ELSEIF (OPNODE_OP(NOD).EQ.OP_UNSIGNED) THEN
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NODE_CONTEXT(NOD)=CX_UNSIGNED
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IF (NODE_CONTEXT(OPNODE_OPND1(NOD)).EQ.0) THEN
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CALL SET_CONTEXT(OPNODE_OPND1(NOD),CX_UNSIGNED)
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ENDIF
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OPNODE_OP(NOD)=OP_NOP
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ELSEIF (OPNODE_OPND2(NOD).EQ.NULL.OR.OPNODE_OP(NOD).EQ.OP_CALL)
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# THEN
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NODE_CONTEXT(NOD)=NODE_CONTEXT(OPNODE_OPND1(NOD))
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RETURN
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ELSEIF (OPNODE_OP(NOD).EQ.OP_ARG) THEN
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IF (NODE_CONTEXT(OPNODE_OPND2(NOD)).EQ.0) THEN
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CALL SET_CONTEXT(OPNODE_OPND2(NOD),CX_SIGNED) !DEBATABLE.
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ENDIF
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RETURN
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ENDIF
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IF (NODE_CONTEXT(OPNODE_OPND1(NOD)).EQ.0) THEN
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NODE_CONTEXT(NOD)=NODE_CONTEXT(OPNODE_OPND2(NOD))
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ELSE
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NODE_CONTEXT(NOD)=NODE_CONTEXT(OPNODE_OPND1(NOD))
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ENDIF
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IF (NODE_CONTEXT(NOD).EQ.0) RETURN
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IF (NODE_CONTEXT(OPNODE_OPND1(NOD)).EQ.0) THEN
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CALL SET_CONTEXT(OPNODE_OPND1(NOD),NODE_CONTEXT(NOD))
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ELSEIF (NODE_CONTEXT(OPNODE_OPND2(NOD)).EQ.0) THEN
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CALL SET_CONTEXT(OPNODE_OPND2(NOD),NODE_CONTEXT(NOD))
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ENDIF
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RETURN
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END
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C--------------------------------------------------------------
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SUBROUTINE RESOLVE_CONTEXT2(NODX)
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CALL RESOLVE_CONTEXT(NODX)
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RETURN
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END
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C--------------------------------------------------------------
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SUBROUTINE SET_CONTEXT(NODX,CNTXTX)
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INCLUDE 'PLMCOM.FOR/NOLIST'
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NOD=NODX
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CNTXT=CNTXTX
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10 IF (NOD.EQ.NULL) RETURN
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NODE_CONTEXT(NOD)=CNTXT
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IF (.NOT. NODE(NOD)) RETURN
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CALL PUSH(NOD,1)
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CALL SET_CONTEXT2(OPNODE_OPND1(NOD),CNTXT)
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CALL POP(NOD,1)
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NOD=OPNODE_OPND2(NOD)
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GO TO 10
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END
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C--------------------------------------------------------------
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SUBROUTINE SET_CONTEXT2(NODX,CNTXTX)
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CALL SET_CONTEXT(NODX,CNTXTX)
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RETURN
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END
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