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69 lines
1.9 KiB
Plaintext
69 lines
1.9 KiB
Plaintext
$title ('BRACKET EXPRESSION')
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brexpr:
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/*
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modified 4/13/81 R. Silberstein
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*/
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do;
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$include (:f1:macro.lit)
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$include (:f1:brexpr.x86)
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$include (:f1:ermod.ext)
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$include (:f1:exglob.ext)
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$eject
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/* compute index expression within brackets */
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bracketexpr: proc(pt) byte public;
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dcl pt address,oper based pt operandstruc,
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(firsttype,firstreg,lasttype,lastreg) byte,
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baseregi lit '0',indexregi lit'1';
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regtyp: proc(pt1,pt2) byte;
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dcl (pt1,pt2) address,(typ based pt1,regi based pt2) byte;
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if (token.type=reg) and (token.descr=wrd) then$do
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typ=baseregi;
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regi=token.value;
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if (regi=rbp) or (regi=rbx) then return true;
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typ=indexregi;
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if (regi=rsi) or (regi=rdi) then return true;
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end$if;
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return false;
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end regtyp;
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setoperflags: proc (pt1,pt2);
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dcl (pt1,pt2) address,(typ based pt1,regi based pt2) byte;
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if typ=indexregi then$do
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oper.sflag=oper.sflag or iregbit;
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IF REGI = RDI THEN OPER.BASEINDEX = OPER.BASEINDEX OR INDEXREGBIT;
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else$do
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oper.sflag=oper.sflag or bregbit;
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IF REGI = RBP THEN OPER.BASEINDEX = OPER.BASEINDEX OR BASEREGBIT;
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end$if;
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end setoperflags;
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if not regtyp(.firsttype,.firstreg) then return false;
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call setoperflags(.firsttype,.firstreg);
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call scan;
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if specialtoken('+') then$do
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call scan;
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if not regtyp(.lasttype,.lastreg) then return false;
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if firsttype=lasttype then return false;
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call setoperflags(.lasttype,.lastreg);
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call scan;
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end$if;
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if not specialtoken(rightbracket) then return false;
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call scan;
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if (oper.sflag and segmbit) = 0 then$do
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if oper.stype=number then$do
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oper.baseindex=oper.baseindex or nooverridebit;
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end$if;
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end$if;
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oper.stype=variable;
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return true;
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end bracketexpr;
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end$module brexpr;
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