+++ /dev/null
-#include <em_spec.h>
-#include <em_pseu.h>
-#include <em_mnem.h>
-#include <em_mes.h>
-#include <em_reg.h>
-#include <pc_size.h>
-
-{
- (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
-
- This product is part of the Amsterdam Compiler Kit.
-
- Permission to use, sell, duplicate or disclose this software must be
- obtained in writing. Requests for such permissions may be sent to
-
- Dr. Andrew S. Tanenbaum
- Wiskundig Seminarium
- Vrije Universiteit
- Postbox 7161
- 1007 MC Amsterdam
- The Netherlands
-
-}
-
-{if next line is included the compiler itself is written in standard pascal}
-{#define STANDARD 1}
-
-{if next line is included, the compiler won't generate static exchanges}
-{#define NO_EXC 1}
-
-{Author: Johan Stevenson Version: 32}
-{$l- : no source line numbers}
-{$r- : no subrange checking}
-{$a- : no assertion checking}
-#ifdef STANDARD
-{$s+ : test conformancy to standard}
-#endif
-
-program pem(input,em,errors);
-{/*
- This Pascal compiler produces EM code as described in
- - A.S.Tanenbaum, J.W.Stevenson & H. van Staveren,
- "Description of a machine architecture for use with
- block structured languages" Informatika rapport 81.
- NOTE: this version is modified to produce the modified EM code of
- januari 1981. it is not possible, using this compiler, to
- generate code for machines with 1 byte wordsize.
- NOTE: this version is modified by Kees Visser in such a way that
- the compiler can now run on 2 and 4 byte machines. It is also
- able to generate em-code for a 2 bytes machine while running
- on a 4-bytes machine. Cross-compilation from a 2 bytes to a
- four bytes machine is also possible with the following
- exception: large integers that don't fit in an integer of
- the compiler are treated like longs and are thus not allowed
- in types.
-
- A description of Pascal is given in
- - K.Jensen & N.Wirth, "PASCAL user manual and report", Springer-Verlag.
- Several options may be given in the normal pascal way. Moreover,
- a positive number may be used instead of + and -. The options are:
- a: interpret assertions (+)
- c: C-type strings allowed (-)
- d: type long may be used (-)
- i: controls the number of elements in integer sets
- default: (wordsize in bits)
- l: insert code to keep track of source lines (+)
- o: optimize (+)
- r: check subranges (+)
- s: accept only standard pascal programs (-)
- t: trace procedure entry and exit (-)
- u: treat '_' as letter (-)
-*/}
-{===================================================================}
-#ifdef STANDARD
-label 9999;
-#endif
-
-const
-{fundamental constants}
- MB1 = 7;
- NB1 = 8;
- MI1 = 127;
- NI1 = 128;
- MI2 = 32767;
- MU1 = 255;
- NU1 = 256;
-
-{string constants}
- imax = 10;
- max2bytes = '0000032767';
- max4bytes = '2147483647';
-
-#if EM_WSIZE == 4
- {this can only be compiled with a compiler that has integer size 4}
- MU2 = 65535;
- NU2 = 65536;
-
- {characteristics of the machine on which the compiler will run}
- {wordsize and integer size are 4}
- MI = 2147483647;
- maxcompintstring = max4bytes;
-#endif
-#if EM_WSIZE == 2
- MU2 = 0; {not used}
- NU2 = 0; {not used}
-
- MI = MI2;
- maxcompintstring = max2bytes;
-#endif
-#if EM_WSIZE != 2 && EM_WSIZE != 4
-Something wrong here!
-#endif
-
-{maximal indices}
- idmax = 8;
- fnmax = 14;
- smax = 72;
-
-{opt values}
- off = 0;
- on = 1;
-
-{for push and pop: }
- global = false;
- local = true;
-
-{for sizeof and posaddr: }
- wordmult = false;
- wordpart = true;
-
-{ASCII characters}
- ascht = 9;
- ascnl = 10;
- ascvt = 11;
- ascff = 12;
- asccr = 13;
-
-{miscellaneous}
- maxcharord = 127; {maximal ordinal number of chars}
- maxargc = 13; {maximal index in argv}
- rwlim = 34; {number of reserved words}
- spaces = ' ';
-
-{-------------------------------------------------------------------}
-type
-{scalar types}
- symbol= (comma,semicolon,colon1,colon2,notsy,lbrack,ident,
- intcst,charcst,realcst,longcst,stringcst,nilcst,minsy,
- plussy,lparent,arrow,arraysy,recordsy,setsy,filesy,
- packedsy,progsy,labelsy,constsy,typesy,varsy,procsy,
- funcsy,beginsy,gotosy,ifsy,whilesy,repeatsy,forsy,
- withsy,casesy,becomes,starsy,divsy,modsy,slashsy,
- andsy,orsy,eqsy,nesy,gtsy,gesy,ltsy,
- lesy,insy,endsy,elsesy,untilsy,ofsy,dosy,
- downtosy,tosy,thensy,rbrack,rparent,period
- ); {the order is important}
- chartype= (lower,upper,digit,layout,tabch,
- quotech,dquotech,colonch,periodch,lessch,
- greaterch,lparentch,lbracech,
- {different entries}
- rparentch,lbrackch,rbrackch,commach,semich,arrowch,
- plusch,minch,slash,star,equal,
- {also symbols}
- others
- );
- standpf= (pread,preadln,pwrite,pwriteln,pput,pget,
- preset,prewrite,pnew,pdispose,ppack,punpack,
- pmark,prelease,ppage,phalt,
- {all procedures}
- feof,feoln,fabs,fsqr,ford,fchr,fpred,fsucc,fodd,
- ftrunc,fround,fsin,fcos,fexp,fsqt,flog,fatn
- {all functions}
- ); {the order is important}
- libmnem= (ELN ,EFL ,CLS ,WDW , {input and output}
- OPN ,GETX,RDI ,RDC ,RDR ,RDL ,RLN ,
- {on inputfiles}
- CRE ,PUTX,WRI ,WSI ,WRC ,WSC ,WRS ,WSS ,WRB ,
- WSB ,WRR ,WSR ,WRL, WSL, WRF ,WRZ ,WSZ ,WLN ,PAG ,
- {on outputfiles, order important}
- ABR ,RND ,SINX,COSX,EXPX,SQT ,LOG ,ATN ,
- {floating point}
- ABI ,ABL ,BCP ,BTS ,NEWX,SAV ,RST ,INI ,HLT ,
- ASS ,GTO ,PAC ,UNP, DIS, ASZ, MDI, MDL
- {miscellaneous}
- );
- structform= (scalar,subrange,pointer,power,files,arrays,carray,
- records,variant,tag); {order important}
- structflag= (spack,withfile);
- identflag= (refer,used,assigned,noreg,loopvar,samesect);
- idclass= (types,konst,vars,field,carrbnd,proc,func);
- kindofpf= (standard,formal,actual,extern,varargs,forward);
- where= (blck,rec,wrec);
- attrkind= (cst,fixed,pfixed,loaded,ploaded,indexed);
- twostruct= (eq,subeq,ir,ri,il,li,lr,rl,es,se,noteq); {order important}
-
-{subrange types}
- rwrange= 0..rwlim;
- byte= 0..MU1;
-
-{pointer types}
- sp= ^structure;
- ip= ^identifier;
- lp= ^labl;
- bp= ^blockinfo;
- np= ^nameinfo;
-#ifdef NO_EXC
- mp= ^mmark;
- op= ^outrec;
-#endif NO_EXC
-
-{set types}
- sos= set of symbol;
- setofids= set of idclass;
- formset= set of structform;
- sflagset= set of structflag;
- iflagset= set of identflag;
-
-{array types}
- idarr=packed array[1..idmax] of char;
- fnarr=packed array[1..fnmax] of char;
-
-{record types}
- position=record {the addr info of certain variable}
- ad:integer; {for locals it is the byte offset}
- lv:integer; {the level of the beast}
- end;
-
-{records of type attr are used to remember qualities of
- expression parts to delay the loading of them.
- Reasons to delay the loading of one word constants:
- - bound checking
- - set building.
- Reasons to delay the loading of direct accessible objects:
- - efficient handling of read/write
- - efficient handling of the with statement.
-}
- attr=record
- asp:sp; {type of expression}
- packbit:boolean; {true for part of packed structure}
- ak:attrkind; {access method}
- pos:position; {lv and ad}
- {If ak=cst then the value is stored in ad}
- end;
-
- nameinfo=record {one for each separate name space}
- nlink:np; {one deeper}
- fname:ip; {first name: root of tree}
- case occur:where of
- blck:();
- rec: ();
- wrec:(wa:attr) {name space opened by with statement}
- end;
-
- blockinfo=record {all info of the current procedure}
- nextbp:bp; {pointer to blockinfo of surrounding proc}
- reglb:integer; {data location counter (from begin of proc) }
- minlb:integer; {keeps track of minimum of reglb}
- ilbno:integer; {number of last local label}
- forwcount:integer; {number of not yet specified forward procs}
- lchain:lp; {first label: header of chain}
- end;
-
- structure=record
- size:integer; {size of structure in bytes}
- sflag:sflagset; {flag bits}
- case form:structform of
- scalar :(scalno:integer; {number of range descriptor}
- fconst:ip {names of constants}
- );
- subrange:(min,max:integer; {lower and upper bound}
- rangetype:sp; {type of bounds}
- subrno:integer {number of subr descriptor}
- );
- pointer :(eltype:sp); {type of pointed object}
- power :(elset:sp); {type of set elements}
- files :(filtype:sp); {type of file elements}
- arrays,carray:
- (aeltype:sp; {type of array elements}
- inxtype:sp; {type of array index}
- arpos:position {position of array descriptor}
- );
- records :(fstfld:ip; {points to first field}
- tagsp:sp {points to tag if present}
- );
- variant :(varval:integer; {tag value for this variant}
- nxtvar:sp; {next equilevel variant}
- subtsp:sp {points to tag for sub-case}
- );
- tag :(fstvar:sp; {first variant of case}
- tfldsp:sp {type of tag}
- )
- end;
-
- identifier=record
- idtype:sp; {type of identifier}
- name:idarr; {name of identifier}
- llink,rlink:ip; {see enterid,searchid}
- next:ip; {used to make several chains}
- iflag:iflagset; {several flag bits}
- case klass:idclass of
- types :();
- konst :(value:integer); {for integers the value is
- computed and stored in this field.
- For strings and reals an assembler constant is
- defined labeled '.1', '.2', ... This '.' number is then
- stored in value. For reals value may be negated to
- indicate that the opposite of the assembler constant
- is needed. }
- vars :(vpos:position); {position of var}
- field :(foffset:integer); {offset to begin of record}
- carrbnd :(); {idtype points to carray struct}
- proc,func:
- (case pfkind:kindofpf of
- standard:(key:standpf); {identification}
- formal,actual,forward,extern,varargs:
- (pfpos:position; {lv gives declaration level.
- ad is relevant for formal pf s and for
- functions (no conflict!!).
- for functions: ad is the result address.
- for formal pf s: ad is the address of the
- descriptor }
- pfno:integer; {unique pf number}
- maxlb:integer; {bytes of parameters}
- parhead:ip {head of parameter list}
- )
- )
- end;
-
- labl=record
- nextlp:lp; {chain of labels}
- seen:boolean;
- labval:integer; {label number given by the programmer}
- labname:integer; {label number given by the compiler}
- labdlb:integer {zero means only locally used,
- otherwise dlbno of label information}
- end;
-
-#ifdef NO_EXC
- outrec=record
- next:op; {chain of records}
- bytes:array[1..16] of byte;
- cnt:0..16;
- end;
-
- mmark=record
- next:mp; {chain of marks}
- count,where:integer;
- end;
-#endif NO_EXC
-{-------------------------------------------------------------------}
-var {the most frequent used externals are declared first}
- sy:symbol; {last symbol}
- a:attr; {type,access method,position,value of expr}
-{returned by insym}
- ch:char; {last character}
- chsy:chartype; {type of ch, used by insym}
- val:integer; {if last symbol is an constant }
- ix:integer; {string length}
- eol:boolean; {true of current ch is a space, replacing a newline}
- zerostring:boolean; {true for strings in " "}
- id:idarr; {if last symbol is an identifier}
-{some counters}
- lino:integer; {line number on code file (1..n) }
- dlbno:integer; {number of last global number}
- holeb:integer; {size of hol-area}
- level:integer; {current static level}
- argc:integer; {index in argv}
- lastpfno:integer; {unique pf number counter}
- copt:integer; {C-type strings allowed if on}
- dopt:integer; {longs allowed if on}
- iopt:integer; {number of bits in sets with base integer}
- sopt:integer; {standard option}
- srcchno:integer; {column count for errors}
- srclino:integer; {source line number after preprocessing}
- srcorig:integer; {source line number before preprocessing}
- fildlb:integer; {label number of source string}
-{pointers pointing to standard types}
- realptr,intptr,textptr,nullset,boolptr:sp;
- charptr,nilptr,zeroptr,procptr,longptr:sp;
-{flags}
- giveline:boolean; {give source line number at next statement}
- including:boolean; {no LINs for included code}
- eofexpected:boolean; {quit without error if true (nextch) }
- main:boolean; {complete programme or a module}
- intypedec:boolean; {true if nested in typedefinition}
- fltused:boolean; {true if floating point instructions are used}
- seconddot:boolean; {indicates the second dot of '..'}
-{pointers}
- fwptr:ip; {head of chain of forward reference pointers}
- progp:ip; {program identifier}
- currproc:ip; {current procedure/function ip (see selector)}
- top:np; {pointer to the most recent name space}
- lastnp:np; {pointer to nameinfo of last searched ident }
-{records}
- b:blockinfo; {all info to be stacked at pfdeclaration}
- fa:attr; {attr for current file name}
-{arrays}
- sizes:array[0 .. sz_last] of integer;
- maxintstring,maxlongstring:packed array[1..imax] of char;
- strbuf:array[1..smax] of char;
- rw:array[rwrange] of idarr;
- {reserved words}
- frw:array[0..idmax] of integer;
- {indices in rw}
- rsy:array[rwrange] of symbol;
- {symbol for reserved words}
- cs:array[char] of chartype;
- {chartype of a character}
- csy:array[rparentch..equal] of symbol;
- {symbol for single character symbols}
- lmn:array[libmnem] of packed array[1..4] of char;
- {mnemonics of pascal library routines}
- opt:array['a'..'z'] of integer;
- forceopt:array['a'..'z'] of boolean;
- {26 different options}
- undefip:array[idclass] of ip;
- {used in searchid}
- iop:array[boolean] of ip;
- {false:standard input, true:standard output}
- argv:array[0..maxargc] of
- record name:idarr; ad:integer end;
- {save here the external heading names}
-{files}
- em:file of byte; {the EM code}
- errors:text; {the compilation errors}
- source:fnarr;
-#ifdef NO_EXC
- ohead: op; {head of outrec list}
- mhead: mp; {head of marks list}
- bcnt: integer;
-#define newmark setmark
-#define relmark(xx) freemark(xx)
-#else not NO_EXC
-#define newmark lino
-#define relmark(xx)
-#endif NO_EXC
-
-{===================================================================}
-
-procedure initpos(var p:position);
-begin p.lv:=level; p.ad:=0; end;
-
-procedure inita(fsp:sp; fad:integer);
-begin with a do begin
- asp:=fsp; packbit:=false; ak:=fixed; pos.ad:=fad; pos.lv:=level;
-end end;
-
-function newip(kl:idclass; n:idarr; idt:sp; nxt:ip):ip;
-var p:ip; f:iflagset;
-begin f:=[];
- case kl of
- types,carrbnd: {similar structure}
- new(p,types);
- konst:
- begin new(p,konst); p^.value:=0 end;
- vars:
- begin new(p,vars); f:=[used,assigned]; initpos(p^.vpos) end;
- field:
- begin new(p,field); p^.foffset:=0 end;
- proc,func: {same structure}
- begin new(p,proc,actual); p^.pfkind:=actual;
- initpos(p^.pfpos); p^.pfno:=0; p^.maxlb:=0; p^.parhead:=nil;
- end
- end;
- p^.name:=n; p^.klass:=kl; p^.idtype:=idt; p^.next:=nxt;
- p^.llink:=nil; p^.rlink:=nil; p^.iflag:=f; newip:=p
-end;
-
-function newsp(sf:structform; sz:integer):sp;
-var p:sp; sflag:sflagset;
-begin sflag:=[];
- case sf of
- scalar:
- begin new(p,scalar); p^.scalno:=0; p^.fconst:=nil end;
- subrange:
- new(p,subrange);
- pointer:
- begin new(p,pointer); p^.eltype:=nil end;
- power:
- new(p,power);
- files:
- begin new(p,files); sflag:=[withfile] end;
- arrays,carray: {same structure}
- new(p,arrays);
- records:
- new(p,records);
- variant:
- new(p,variant);
- tag:
- new(p,tag);
- end;
- p^.form:=sf; p^.size:=sz; p^.sflag:=sflag; newsp:=p;
-end;
-
-function sizeof(fsp:sp; partword:boolean):integer;
-var s:integer;
-begin if fsp=nil then s:=0 else s:=fsp^.size;
- if s<>0 then
- if partword and (s<sz_word) then
- while sz_word mod s <> 0 do s:=s+1
- else
- while s mod sz_word <> 0 do s:=s+1;
- sizeof:=s
-end;
-
-function formof(fsp:sp; forms:formset):boolean;
-begin if fsp=nil then formof:=false else formof:=fsp^.form in forms end;
-
-{===================================================================}
-
-#ifdef NO_EXC
-procedure newoutrec;
-var p:op;
-begin
- new(p);
- bcnt := bcnt+1;
- with p^ do begin cnt := 0; next := ohead end;
- ohead := p
-end;
-
-procedure put1(b:byte);
-begin
- if mhead = nil then write(em,b)
- else begin
- if ohead^.cnt = 16 then newoutrec;
- with ohead^ do
- begin cnt := cnt + 1; bytes[cnt] := b end
- end
-end;
-#else not NO_EXC
-procedure put1(b:byte);
-begin write(em,b) end;
-#endif NO_EXC
-
-procedure put2(i:integer);
-var i1,i2:byte;
-begin
- if i<0 then
- begin i:=-(i+1); i1:=MU1 - i mod NU1; i2:=MU1 - i div NU1 end
- else
- begin i1:=i mod NU1; i2:=i div NU1 end;
- put1(i1); put1(i2)
-end;
-
-#if EM_WSIZE == 4
-procedure put4(i:integer);
-var i1,i2:integer;
-begin
- if i<0 then
- begin i:=-(i+1); i1:=MU2 - i mod NU2; i2:=MU2 - i div NU2 end
- else
- begin i1:=i mod NU2; i2:=i div NU2 end;
- put1(i1 mod NU1); put1(i1 div NU1);
- put1(i2 mod NU1); put1(i2 div NU1)
-end;
-#endif
-
-procedure argend;
-begin put1(sp_cend) end;
-
-procedure argcst(i:integer);
-begin
- if (i >= -sp_zcst0) and (i < sp_ncst0-sp_zcst0) then
- put1(i + sp_zcst0 + sp_fcst0)
- else
-#if EM_WSIZE == 4
- if (i >= -MI2-1) and (i <= MI2) then
-#endif
- begin put1(sp_cst2); put2(i) end
-#if EM_WSIZE == 4
- else begin put1(sp_cst4); put4(i) end
-#endif
-end;
-
-procedure argnil;
-begin put1(sp_icon); argcst(sz_addr); argcst(1); put1(ord('0')) end;
-
-procedure argilb(i:integer);
-begin
- if i<=MU1 then
- begin put1(sp_ilb1); put1(i) end
- else
- begin put1(sp_ilb2); put2(i) end
-end;
-
-procedure argdlb(i:integer);
-begin
- if i<=MU1 then
- begin put1(sp_dlb1); put1(i) end
- else
- begin put1(sp_dlb2); put2(i) end
-end;
-
-procedure argident(var a:idarr);
-var i,j:integer;
-begin i:=idmax;
- while (a[i]=' ') and (i>1) do i:=i-1;
- put1(sp_pnam); argcst(i);
- for j:=1 to i do put1(ord(a[j]))
-end;
-
-procedure genop(b:byte);
-begin put1(b); lino:=lino+1 end;
-
-procedure gencst(b:byte; i:integer);
-begin genop(b); argcst(i) end;
-
-procedure gensp(m:libmnem; s:integer);
-var i:integer;
-begin genop(op_cal); put1(sp_pnam); argcst(4);
- for i:=1 to 4 do put1(ord(lmn[m][i]));
- gencst(op_asp,s)
-end;
-
-procedure genpnam(b:byte; fip:ip);
-var n:idarr; i,j:integer;
-begin
- if fip^.pfpos.lv<=1 then n:=fip^.name else
- begin n:='_ '; j:=1; i:=fip^.pfno;
- while i<>0 do
- begin j:=j+1; n[j]:=chr(i mod 10 + ord('0')); i:=i div 10 end;
- end;
- genop(b); argident(n)
-end;
-
-procedure genasp(m:byte);
-begin gencst(m,sizeof(a.asp,wordmult)) end;
-
-procedure genlin;
-begin giveline:=false;
- if opt['l']<>off then if main then gencst(op_lin,srcorig)
-end;
-
-procedure genreg(sz,ad,regval:integer);
-begin gencst(ps_mes,ms_reg);
- argcst(ad); argcst(sz); argcst(regval); argend
-end;
-
-procedure laedlb(d:integer);
-begin genop(op_lae); argdlb(d) end;
-
-#ifdef NO_EXC
-procedure reloutrec;
-var i,j,k:integer;
- q, r, p:op;
- m : mp;
-begin p := ohead; q := p;
- if mhead <> nil then
- begin
- m := mhead; while m^.next <> nil do m := m^.next;
- k := (bcnt - m^.where) + 1
- end
- else begin k := 0; ohead := nil; bcnt := 0 end;
- for i := 1 to k do begin q := p; p := p^.next end;
- if q <> p then q^.next := nil;
- if p <> nil then
- begin r := nil;
- while p <> nil do
- begin q := p^.next; p^.next := r; r := p; p := q end;
- while r <> nil do with r^ do
- begin
- for j := 1 to cnt do write(em, bytes[j]);
- r := next
- end
- end
-end;
-
-function setmark:integer;
-var p:mp; nm:boolean;
-begin nm := false;
- if mhead <> nil then with mhead^ do
- if (where = bcnt) and (ohead^.cnt = 0) then
- begin count := count + 1; nm := true end;
- if not nm then
- begin new(p); newoutrec;
- with p^ do
- begin where := bcnt; count := 1; next := mhead end;
- mhead := p;
- end;
- setmark := bcnt
-end;
-
-procedure freemark(m : integer);
-var p, q : mp;
-begin assert(mhead <> nil); p := mhead; q := p;
- while p^.where <> m do
- begin q := p; p := p^.next; assert(p <> nil) end;
- with p^ do
- begin assert(count > 0); count := count - 1; if count = 0 then
- begin
- if p = mhead then begin mhead := next; reloutrec end
- else q^.next := next
- end
-end end;
-
-procedure exchange(n,m:integer);
-var i:integer;
- p,q,r:op;
-begin assert(m >= n);
- if n <> m then
- begin
- p := ohead;
- for i := bcnt downto m+1 do p := p^.next;
- q := p;
- for i := m downto n+1 do q := q^.next;
- r := ohead; ohead := p^.next; p^.next := q^.next; q^.next := r
- end
-end;
-#else not NO_EXC
-procedure exchange(l1,l2:integer);
-var d1,d2:integer;
-begin d1:=l2-l1; d2:=lino-l2;
- if (d1<>0) and (d2<>0) then
- begin gencst(ps_exc,d1); argcst(d2) end
-end;
-#endif NO_EXC
-
-procedure newilb(i:integer);
-begin lino:=lino+1;
- if i<sp_nilb0 then put1(i+sp_filb0) else argilb(i)
-end;
-
-function newdlb:integer;
-begin lino:=lino+1; dlbno:=dlbno+1; argdlb(dlbno); newdlb:=dlbno end;
-
-function romstr(typ:byte; siz:integer):integer;
-var i:integer;
-begin romstr:=newdlb; genop(ps_rom);
- put1(typ); if typ<>sp_scon then argcst(siz); argcst(ix);
- for i:=1 to ix do put1(ord(strbuf[i])); argend
-end;
-
-{===================================================================}
-
-procedure error(err:integer);
-{as you will notice, all error numbers are preceded by '+' and '0' to
- ease their renumbering in case of new errornumbers.
-}
-begin writeln(errors,err,srclino,srcchno);
- if err>0 then begin gencst(ps_mes,ms_err); argend end
-end;
-
-procedure errid(err:integer; var id:idarr);
-begin write(errors,'''',id); error(err) end;
-
-procedure errint(err:integer; i:integer);
-begin write(errors,i:1); error(err) end;
-
-procedure errasp(err:integer);
-begin if a.asp<>nil then begin error(err); a.asp:=nil end end;
-
-procedure teststandard;
-begin if sopt<>off then error(-(+01)) end;
-
-procedure enterid(fip: ip);
-{enter id pointed at by fip into the name-table,
- which on each declaration level is organised as
- an unbalanced binary tree}
-var nam:idarr; lip,lip1:ip; lleft,again:boolean;
-begin nam:=fip^.name; again:=false; assert nam[1]<>' ';
- lip:=top^.fname;
- if lip=nil then top^.fname:=fip else
- begin
- repeat lip1:=lip;
- if lip^.name>nam then
- begin lip:=lip^.llink; lleft:=true end
- else
- begin if lip^.name=nam then again:=true; {name conflict}
- lip:=lip^.rlink; lleft:=false;
- end;
- until lip=nil;
- if lleft then lip1^.llink:=fip else lip1^.rlink:=fip
- end;
- fip^.llink:=nil; fip^.rlink:=nil;
- if again then errid(+02,nam);
-end;
-
-{===================================================================}
-
-procedure trace(tname:idarr; fip:ip; var namdlb:integer);
-var i:integer;
-begin
- if opt['t']<>off then
- begin
- if namdlb=0 then
- begin namdlb:=newdlb; genop(ps_rom); put1(sp_scon); argcst(8);
- for i:=1 to 8 do put1(ord(fip^.name[i])); argend;
- end;
- laedlb(namdlb); genop(op_cal); argident(tname);
- gencst(op_asp,sz_addr);
- end;
-end;
-
-procedure expandnullset(fsp:sp);
-var s:integer;
-begin s:=sizeof(fsp,wordmult)-sz_word;
- if s<>0 then gencst(op_zer,s); a.asp:=fsp
-end;
-
-procedure push(local:boolean; ad:integer; sz:integer);
-begin assert sz mod sz_word = 0;
- if sz=sz_word then
- if local then gencst(op_lol,ad) else gencst(op_loe,ad)
- else if sz=2*sz_word then
- if local then gencst(op_ldl,ad) else gencst(op_lde,ad)
- else
- begin if local then gencst(op_lal,ad) else gencst(op_lae,ad);
- gencst(op_loi,sz)
- end
-end;
-
-procedure pop(local:boolean; ad:integer; sz:integer);
-begin assert sz mod sz_word = 0;
- if sz=sz_word then
- if local then gencst(op_stl,ad) else gencst(op_ste,ad)
- else if sz=2*sz_word then
- if local then gencst(op_sdl,ad) else gencst(op_sde,ad)
- else
- begin if local then gencst(op_lal,ad) else gencst(op_lae,ad);
- gencst(op_sti,sz)
- end
-end;
-
-procedure lexaddr(lv:integer; ad:integer);
-begin assert level>=lv;
- if ad>=0 then gencst(op_lxa,level-lv) else gencst(op_lxl,level-lv);
- gencst(op_adp,ad)
-end;
-
-procedure loadpos(var p:position; sz:integer);
-begin with p do
- if lv<=0 then push(global,ad,sz) else
- if lv=level then push(local,ad,sz) else
- begin lexaddr(lv,ad); gencst(op_loi,sz) end;
-end;
-
-procedure descraddr(var p:position);
-begin if p.lv=0 then laedlb(p.ad) else loadpos(p,sz_addr) end;
-
-procedure loadaddr;
-begin with a,pos do begin
- case ak of
- fixed:
- if lv<=0 then gencst(op_lae,ad) else
- if lv=level then gencst(op_lal,ad) else lexaddr(lv,ad);
- pfixed:
- loadpos(pos,sz_addr);
- ploaded:
- ;
- indexed:
- gencst(op_aar,sz_word);
- end; {case}
- ak:=ploaded;
-end end;
-
-procedure load;
-var sz:integer;
-begin with a do begin sz:=sizeof(asp,packbit);
- if asp<>nil then begin
- case ak of
- cst:
- gencst(op_loc,pos.ad); {only one-word scalars}
- fixed:
- loadpos(pos,sz);
- pfixed:
- begin loadpos(pos,sz_addr); gencst(op_loi,sz) end;
- loaded:
- ;
- ploaded:
- gencst(op_loi,sz);
- indexed:
- gencst(op_lar,sz_word);
- end; {case}
- if asp^.form = subrange then
- if sz < sz_word then
- if asp^.min < 0 then
- { do sign extension }
- begin gencst(op_loc, sz); gencst(op_loc, sz_word); genop(op_cii) end;
- end;
- ak:=loaded;
-end end;
-
-procedure store;
-var sz:integer;
-begin with a,pos do begin sz:=sizeof(asp,packbit);
- if asp<>nil then
- case ak of
- fixed:
- if lv<=0 then pop(global,ad,sz) else
- if level=lv then pop(local,ad,sz) else
- begin lexaddr(lv,ad); gencst(op_sti,sz) end;
- pfixed:
- begin loadpos(pos,sz_addr); gencst(op_sti,sz) end;
- ploaded:
- gencst(op_sti,sz);
- indexed:
- gencst(op_sar,sz_word);
- end; {case}
-end end;
-
-procedure fieldaddr(off:integer);
-begin with a do
- if (ak=fixed) and not packbit then pos.ad:=pos.ad+off else
- begin loadaddr; gencst(op_adp,off) end
-end;
-
-procedure loadcheap;
-begin if formof(a.asp,[arrays..records]) then loadaddr else load end;
-
-{===================================================================}
-
-procedure nextch;
-begin
- eol:=eoln(input); read(input,ch); chsy:=cs[ch];
- if chsy <> tabch then srcchno:=srcchno+1
-end;
-
-procedure nextln;
-begin
- if eof(input) then
- begin
- if not eofexpected then error(+03) else
- if fltused then begin gencst(ps_mes,ms_flt); argend end;
-#ifdef STANDARD
- goto 9999
-#else
- halt
-#endif
- end;
- srcchno:=0; srclino:=srclino+1;
- if not including then
- begin srcorig:=srcorig+1; giveline:=true end;
-end;
-
-procedure options(normal:boolean);
-var ci:char; i:integer;
-
-procedure getc;
-begin if normal then nextch else read(errors,ch) end;
-
-begin
- repeat getc;
- if (ch>='a') and (ch<='z') then
- begin ci:=ch; getc; i:=0;
- if ch='+' then begin i:=1; getc end else
- if ch='-' then getc else
- if cs[ch]=digit then
- repeat i:=i*10 + ord(ch) - ord('0'); getc;
- until cs[ch]<>digit
- else i:=-1;
- if i>=0 then
- if not normal then
- begin forceopt[ci]:=true; opt[ci]:=i end
- else
- if not forceopt[ci] then opt[ci]:=i;
- end;
- until ch<>',';
-end;
-
-procedure linedirective;
-var i:integer; fname:fnarr;
-begin
- repeat nextch until (ch='"') or eol;
- if eol then error(+04) else
- begin nextch; i:=0;
- while (ch<>'"') and not eol do
- begin
- if ch='/' then i:=0 else
- begin i:=i+1; if i<=fnmax then fname[i]:=ch end;
- nextch
- end;
- while i<fnmax do begin i:=i+1; fname[i]:=' ' end;
- including:=fname<>source; while not eol do nextch
- end;
-end;
-
-procedure putdig;
-begin ix:=ix+1; if ix<=smax then strbuf[ix]:=ch; nextch end;
-
-procedure inident;
-label 1;
-var i,k:integer;
-begin k:=0; id:=spaces;
- repeat
- if chsy=upper then ch:=chr(ord(ch)-ord('A')+ord('a'));
- if k<idmax then begin k:=k+1; id[k]:=ch end;
- nextch
- until chsy>digit;
- {lower=0,upper=1,digit=2. ugly but fast}
- for i:=frw[k-1] to frw[k] - 1 do
- if rw[i]=id then
- begin sy:=rsy[i]; goto 1 end;
- sy:=ident;
-1:
-end;
-
-procedure innumber;
-label 1;
-var i,j:integer;
- is:packed array[1..imax] of char;
-begin ix:=0; sy:=intcst; val:=0;
- repeat putdig until chsy<>digit;
- if (ch='.') or (ch='e') or (ch='E') then
- begin
- if ch='.' then
- begin putdig;
- if ch='.' then
- begin seconddot:=true; ix:=ix-1; goto 1 end;
- if chsy<>digit then error(+05) else
- repeat putdig until chsy<>digit;
- end;
- if (ch='e') or (ch='E') then
- begin putdig;
- if (ch='+') or (ch='-') then putdig;
- if chsy<>digit then error(+06) else
- repeat putdig until chsy<>digit;
- end;
- if ix>smax then begin error(+07); ix:=smax end;
- sy:=realcst; fltused:=true; val:=romstr(sp_fcon,sz_real);
- end;
-1:if (chsy=lower) or (chsy=upper) then teststandard;
- if sy=intcst then
- if ix>imax then error(+08) else
- begin is:='0000000000'; i:=ix; j:=imax;
- repeat is[j]:=strbuf[i]; j:=j-1; i:=i-1 until i=0;
- if (is<=maxintstring) and (is<=maxcompintstring) then
- repeat j:=j+1; val:=val*10 - ord('0') + ord(is[j]) until j=imax
- else if (is<=maxlongstring) and (dopt<>off) then
- begin sy:=longcst; val:=romstr(sp_icon,sz_long) end
- else error(+09)
- end
-end;
-
-procedure instring(qc:char);
-begin ix:=0; zerostring:=qc='"';
- repeat
- repeat nextch; ix:=ix+1; if ix<=smax then strbuf[ix]:=ch;
- until (ch=qc) or eol;
- if ch=qc then nextch else error(+010);
- until ch<>qc;
- if not zerostring then
- begin ix:=ix-1; if ix=0 then error(+011) end
- else
- begin strbuf[ix]:=chr(0); if copt=off then error(+012) end;
- if (ix=1) and not zerostring then
- begin sy:=charcst; val:=ord(strbuf[1]) end
- else
- begin if ix>smax then begin error(+013); ix:=smax end;
- sy:=stringcst; val:=romstr(sp_scon,0);
- end
-end;
-
-procedure incomment;
-var stopc:char;
-begin nextch; stopc:='}';
- if ch='$' then options(true);
- while (ch<>'}') and (ch<>stopc) do
- begin stopc:='}'; if ch='*' then stopc:=')';
- if eol then nextln; nextch
- end;
- if ch<>'}' then teststandard;
- nextch
-end;
-
-procedure insym;
- {read next basic symbol of source program and return its
- description in the global variables sy, op, id, val and ix}
-label 1;
-begin
-1:case chsy of
- tabch:
- begin srcchno:=srcchno - srcchno mod 8 + 8; nextch; goto 1 end;
- layout:
- begin if eol then nextln; nextch; goto 1 end;
- lower,upper: inident;
- digit: innumber;
- quotech,dquotech:
- instring(ch);
- colonch:
- begin nextch;
- if ch='=' then begin sy:=becomes; nextch end else sy:=colon1
- end;
- periodch:
- begin nextch;
- if seconddot then begin seconddot:=false; sy:=colon2 end else
- if ch='.' then begin sy:=colon2; nextch end else sy:=period
- end;
- lessch:
- begin nextch;
- if ch='=' then begin sy:=lesy; nextch end else
- if ch='>' then begin sy:=nesy; nextch end else sy:=ltsy
- end;
- greaterch:
- begin nextch;
- if ch='=' then begin sy:=gesy; nextch end else sy:=gtsy
- end;
- lparentch:
- begin nextch;
- if ch<>'*' then sy:=lparent else
- begin teststandard; incomment; goto 1 end;
- end;
- lbracech:
- begin incomment; goto 1 end;
- rparentch,lbrackch,rbrackch,commach,semich,arrowch,
- plusch,minch,slash,star,equal:
- begin sy:=csy[chsy]; nextch end;
- others:
- begin
- if (ch='#') and (srcchno=1) then linedirective else
- begin error(+014); nextch end;
- goto 1
- end;
- end {case}
-end;
-
-procedure nextif(fsy:symbol; err:integer);
-begin if sy=fsy then insym else error(-err) end;
-
-function find1(sys1,sys2:sos; err:integer):boolean;
-{symbol of sys1 expected. return true if sy in sys1}
-begin
- if not (sy in sys1) then
- begin error(err); while not (sy in sys1+sys2) do insym end;
- find1:=sy in sys1
-end;
-
-function find2(sys1,sys2:sos; err:integer):boolean;
-{symbol of sys1+sys2 expected. return true if sy in sys1}
-begin
- if not (sy in sys1+sys2) then
- begin error(err); repeat insym until sy in sys1+sys2 end;
- find2:=sy in sys1
-end;
-
-function find3(sy1:symbol; sys2:sos; err:integer):boolean;
-{symbol sy1 or one of sys2 expected. return true if sy1 found and skip it}
-begin find3:=true;
- if not (sy in [sy1]+sys2) then
- begin error(err); repeat insym until sy in [sy1]+sys2 end;
- if sy=sy1 then insym else find3:=false
-end;
-
-function endofloop(sys1,sys2:sos; sy3:symbol; err:integer):boolean;
-begin endofloop:=false;
- if find2(sys2+[sy3],sys1,err) then nextif(sy3,err+1)
- else endofloop:=true;
-end;
-
-function lastsemicolon(sys1,sys2:sos; err:integer):boolean;
-begin lastsemicolon:=true;
- if not endofloop(sys1,sys2,semicolon,err) then
- if find2(sys2,sys1,err+2) then lastsemicolon:=false
-end;
-
-{===================================================================}
-
-function searchid(fidcls: setofids):ip;
-{search for current identifier symbol in the name table}
-label 1;
-var lip:ip; ic:idclass;
-begin lastnp:=top;
- while lastnp<>nil do
- begin lip:=lastnp^.fname;
- while lip<>nil do
- if lip^.name=id then
- if lip^.klass in fidcls then
- begin
- if lip^.klass=vars then if lip^.vpos.lv<>level then
- lip^.iflag:=lip^.iflag+[noreg];
- goto 1
- end
- else lip:=lip^.rlink
- else
- if lip^.name< id then lip:=lip^.rlink else lip:=lip^.llink;
- lastnp:=lastnp^.nlink;
- end;
- errid(+015,id);
- if types in fidcls then ic:=types else
- if vars in fidcls then ic:=vars else
- if konst in fidcls then ic:=konst else
- if proc in fidcls then ic:=proc else
- if func in fidcls then ic:=func else ic:=field;
- lip:=undefip[ic];
-1:
- searchid:=lip
-end;
-
-function searchsection(fip: ip):ip;
-{to find record fields and forward declared procedure identifiers
- -->procedure pfdeclaration
- -->procedure selector}
-label 1;
-begin
- while fip<>nil do
- if fip^.name=id then goto 1 else
- if fip^.name< id then fip:=fip^.rlink else fip:=fip^.llink;
-1: searchsection:=fip
-end;
-
-function searchlab(flp:lp; val:integer):lp;
-label 1;
-begin
- while flp<>nil do
- if flp^.labval=val then goto 1 else flp:=flp^.nextlp;
-1:searchlab:=flp
-end;
-
-procedure opconvert(ts:twostruct);
-var op:integer;
-begin with a do begin genasp(op_loc);
- case ts of
- ir, lr: begin asp:=realptr; op:=op_cif; fltused:=true end;
- ri: begin asp:=intptr ; op:=op_cfi; fltused:=true end;
- rl: begin asp:=longptr; op:=op_cfi; fltused:=true end;
- li: begin asp:=intptr ; op:=op_cii end;
- il: begin asp:=longptr; op:=op_cii end;
- end;
- genasp(op_loc); genop(op)
-end end;
-
-procedure negate;
-begin if a.asp=realptr then genasp(op_ngf) else genasp(op_ngi) end;
-
-function desub(fsp:sp):sp;
-begin if formof(fsp,[subrange]) then fsp:=fsp^.rangetype; desub:=fsp end;
-
-function nicescalar(fsp:sp):boolean;
-begin
- if fsp=nil then nicescalar:=true else
- nicescalar:=(fsp^.form=scalar) and (fsp<>realptr) and (fsp<>longptr)
-end;
-
-function bounded(fsp:sp):boolean;
-begin bounded:=false;
- if fsp<>nil then
- if fsp^.form=subrange then bounded:=true else
- if fsp^.form=scalar then bounded:=fsp^.fconst<>nil
-end;
-
-procedure bounds(fsp:sp; var fmin,fmax:integer);
-begin
- if fsp=nil then
- begin fmin:=0; fmax:=0 end
- else
- case fsp^.form of
- subrange:
- begin fmin:=fsp^.min; fmax:=fsp^.max end;
- scalar:
- begin fmin:=0; fmax:=fsp^.fconst^.value end
- end
-end;
-
-procedure genrck(fsp:sp);
-var min,max,sno:integer;
-begin
- if opt['r']<>off then if bounded(fsp) then
- begin
- if fsp^.form=scalar then sno:=fsp^.scalno else sno:=fsp^.subrno;
- if sno=0 then
- begin bounds(fsp,min,max); sno:=newdlb;
- gencst(ps_rom,min); argcst(max); argend;
- if fsp^.form=scalar then fsp^.scalno:=sno else fsp^.subrno:=sno
- end;
- laedlb(sno); gencst(op_rck,sz_word);
- end
-end;
-
-procedure checkbnds(fsp:sp);
-var min1,max1,min2,max2:integer;
-begin
- if bounded(fsp) then
- if not bounded(a.asp) then genrck(fsp) else
- begin bounds(fsp,min1,max1); bounds(a.asp,min2,max2);
- if (min2<min1) or (max2>max1) then
- genrck(fsp);
- end;
- a.asp:=fsp;
-end;
-
-function eqstruct(p,q:sp):boolean;
-begin eqstruct:=(p=q) or (p=nil) or (q=nil) end;
-
-function string(fsp:sp):boolean;
-var lsp:sp;
-begin string:=false;
- if formof(fsp,[arrays]) then
- if eqstruct(fsp^.aeltype,charptr) then
- if spack in fsp^.sflag then
- begin lsp:=fsp^.inxtype;
- if lsp=nil then string:=true else
- if lsp^.form=subrange then
- if lsp^.rangetype=intptr then
- if lsp^.min=1 then
- string:=true
- end
-end;
-
-function compat(p,q:sp):twostruct;
-begin compat:=noteq;
- if eqstruct(p,q) then compat:=eq else
- begin p:=desub(p); q:=desub(q);
- if eqstruct(p,q) then compat:=subeq else
- if p^.form=q^.form then
- case p^.form of
- scalar:
- if (p=intptr) and (q=realptr) then compat:=ir else
- if (p=realptr) and (q=intptr) then compat:=ri else
- if (p=intptr) and (q=longptr) then compat:=il else
- if (p=longptr) and (q=intptr) then compat:=li else
- if (p=longptr) and (q=realptr) then compat:=lr else
- if (p=realptr) and (q=longptr) then compat:=rl else
- ;
- pointer:
- if (p=nilptr) or (q=nilptr) then compat:=eq;
- power:
- if p=nullset then compat:=es else
- if q=nullset then compat:=se else
- if compat(p^.elset,q^.elset) <= subeq then
- if p^.sflag=q^.sflag then compat:=eq;
- arrays:
- if string(p) and string(q) and (p^.size=q^.size) then compat:=eq;
- files,carray,records: ;
- end;
- end
-end;
-
-procedure checkasp(fsp:sp; err:integer);
-var ts:twostruct;
-begin
- ts:=compat(a.asp,fsp);
- case ts of
- eq:
- if fsp<>nil then if withfile in fsp^.sflag then errasp(err);
- subeq:
- checkbnds(fsp);
- li:
- begin opconvert(ts); checkasp(fsp,err) end;
- il,rl,lr,ir:
- opconvert(ts);
- es:
- expandnullset(fsp);
- noteq,ri,se:
- errasp(err);
- end
-end;
-
-procedure force(fsp:sp; err:integer);
-begin load; checkasp(fsp,err) end;
-
-function newident(kl:idclass; idt:sp; nxt:ip; err:integer):ip;
-begin newident:=nil;
- if sy<>ident then error(err) else
- begin newident:=newip(kl,id,idt,nxt); insym end
-end;
-
-function stringstruct:sp;
-var lsp:sp;
-begin {only used when ix and zerostring are still valid}
- if zerostring then lsp:=zeroptr else
- begin lsp:=newsp(arrays,ix*sz_char); lsp^.sflag:=[spack];
- lsp^.aeltype:=charptr; lsp^.inxtype:=nil;
- end;
- stringstruct:=lsp;
-end;
-
-function posaddr(var lb:integer; fsp:sp; partword:boolean):integer;
-var sz:integer;
-begin sz:=sizeof(fsp,partword);
- if sz_int = 2 then
- if lb >= MI2-sz-sz_word then begin error(+016); lb:=0 end;
- if not partword or (sz>=sz_word) then
- while lb mod sz_word <> 0 do lb:=lb+1;
- posaddr:=lb;
- lb:=lb+sz
-end;
-
-function negaddr(fsp:sp):integer;
-var sz:integer;
-begin with b do begin
- sz:=sizeof(fsp,wordmult);
- if sz_int = 2 then
- if reglb <= -MI2+sz+sz_word then begin error(+017); reglb:=0 end;
- reglb:=reglb-sz;
- while reglb mod sz_word <> 0 do reglb:=reglb-1;
- if reglb < minlb then minlb:=reglb;
- negaddr:=reglb
-end end;
-
-procedure temporary(fsp:sp;r:integer);
-begin inita(fsp,negaddr(fsp));
- if r>=0 then genreg(sizeof(fsp,wordmult),a.pos.ad,r)
-end;
-
-procedure genhol;
- var sz: integer;
-begin sz := posaddr(holeb,nil,false); if sz = 0 then sz := sz_word;
- gencst(ps_hol,sz);
- if sz_word = 4 then begin put1(sp_cst4); put1(0); put1(0); end
- else put1(sp_cst2);
- put1(0); put1(128); { 1000000000000000 pattern}
- argcst(0); level:=1
-end;
-
-function arraysize(fsp:sp; pack:boolean):integer;
-var sz,min,max,tot,n:integer;
-begin sz:=sizeof(fsp^.aeltype,pack);
- bounds(fsp^.inxtype,min,max);
- fsp^.arpos.lv:=0; fsp^.arpos.ad:=newdlb;
- gencst(ps_rom,min); argcst(max-min); argcst(sz); argend;
- n:=max-min+1; tot:=sz*n;
- if sz<>0 then if tot div sz <> n then begin error(+018); tot:=0 end;
- arraysize:=tot
-end;
-
-procedure treewalk(fip:ip);
-var lsp:sp; i,sz:integer;
-begin
- if fip<>nil then
- begin treewalk(fip^.llink); treewalk(fip^.rlink);
- if fip^.klass=vars then
- begin if not (used in fip^.iflag) then errid(-(+019),fip^.name);
- if not (assigned in fip^.iflag) then errid(-(+020),fip^.name);
- lsp:=fip^.idtype;
- if level<>1 then
- if (refer in fip^.iflag) or not (noreg in fip^.iflag) then
- if (refer in fip^.iflag) or formof(lsp,[pointer]) then
- genreg(sz_addr,fip^.vpos.ad,reg_pointer)
- else
- begin sz:=sizeof(lsp,wordmult);
- if loopvar in fip^.iflag then
- genreg(sz,fip^.vpos.ad,reg_loop)
- else if lsp=realptr then
- genreg(sz,fip^.vpos.ad,reg_float)
- else
- genreg(sz,fip^.vpos.ad,reg_any);
- end;
- if lsp<>nil then if withfile in lsp^.sflag then
- if lsp^.form=files then
- if level=1 then
- begin
- for i:=2 to argc do with argv[i] do
- if name=fip^.name then ad:=fip^.vpos.ad
- end
- else
- begin
- if not (refer in fip^.iflag) then
- begin gencst(op_lal,fip^.vpos.ad); gensp(CLS,sz_addr)
- end
- end
- else
- if level<>1 then errid(-(+021),fip^.name)
- end
- end
-end;
-
-procedure constant(fsys:sos; var fsp:sp; var fval:integer);
-var signed,min:boolean; lip:ip;
-begin signed:=(sy=plussy) or (sy=minsy);
- if signed then begin min:=sy=minsy; insym end else min:=false;
- if find1([ident..stringcst],fsys,+022) then
- begin fval:=val;
- case sy of
- stringcst: fsp:=stringstruct;
- charcst: fsp:=charptr;
- intcst: fsp:=intptr;
- realcst: fsp:=realptr;
- longcst: fsp:=longptr;
- ident:
- begin lip:=searchid([konst]);
- fsp:=lip^.idtype; fval:=lip^.value;
- end
- end; {case}
- if signed then
- if (fsp<>intptr) and (fsp<>realptr) and (fsp<>longptr) then
- error(+023)
- else if min then fval:= -fval;
- {note: negating the v-number for reals and longs}
- insym;
- end
- else begin fsp:=nil; fval:=0 end;
-end;
-
-function cstinteger(fsys:sos; fsp:sp; err:integer):integer;
-var lsp:sp; lval,min,max:integer;
-begin constant(fsys,lsp,lval);
- if fsp<>lsp then
- if not eqstruct(desub(fsp),lsp) then
- begin error(err); lval:=0 end
- else if bounded(fsp) then
- begin bounds(fsp,min,max);
- if (lval<min) or (lval>max) then error(+024)
- end;
- cstinteger:=lval
-end;
-
-{===================================================================}
-
-function typid(err:integer):sp;
-var lip:ip; lsp:sp;
-begin lsp:=nil;
- if sy<>ident then error(err) else
- begin lip:=searchid([types]); lsp:=lip^.idtype; insym end;
- typid:=lsp
-end;
-
-function simpletyp(fsys:sos):sp;
-var lsp,lsp1:sp; lip,hip:ip; min,max:integer; lnp:np;
- newsubrange:boolean;
-begin lsp:=nil;
- if find1([ident..lparent],fsys,+025) then
- if sy=lparent then
- begin insym; lnp:=top; {decl. consts local to innermost block}
- while top^.occur<>blck do top:=top^.nlink;
- lsp:=newsp(scalar,sz_word); hip:=nil; max:=0;
- repeat lip:=newident(konst,lsp,hip,+026);
- if lip<>nil then
- begin enterid(lip); hip:=lip; lip^.value:=max; max:=max+1 end;
- until endofloop(fsys+[rparent],[ident],comma,+027); {+028}
- if max<=MU1 then lsp^.size:=sz_byte
-#if EM_WSIZE == 4
- else if max <= MU2 then lsp^.size := 2*sz_byte
-#endif
- ;
- lsp^.fconst:=hip; top:=lnp; nextif(rparent,+029);
- end
- else
- begin newsubrange:=true;
- if sy=ident then
- begin lip:=searchid([types,konst]); insym;
- if lip^.klass=types then
- begin lsp:=lip^.idtype; newsubrange:=false end
- else
- begin lsp1:=lip^.idtype; min:=lip^.value end
- end
- else constant(fsys+[colon2,ident..plussy],lsp1,min);
- if newsubrange then
- begin lsp:=newsp(subrange,sz_word); lsp^.subrno:=0;
- if not nicescalar(lsp1) then
- begin error(+030); lsp1:=nil; min:=0 end;
- lsp^.rangetype:=lsp1;
- nextif(colon2,+031); max:=cstinteger(fsys,lsp1,+032);
- if min>max then begin error(+033); max:=min end;
- if ((min>=0) and (max<=MU1)) or ((min>=-NI1) and (max<=MI1)) then
- lsp^.size:=sz_byte
-#if EM_WSIZE == 4
- else if ((min>=0) and (max<=MU2)) or ((min>=-MI2-1) and (max<=MI2)) then
- lsp^.size := 2*sz_byte
-#endif
- ;
- lsp^.min:=min; lsp^.max:=max
- end
- end;
- simpletyp:=lsp
-end;
-
-function arraytyp(fsys:sos;
- artyp:structform;
- sflag:sflagset;
- function element(fsys:sos):sp
- ):sp;
-var lsp,lsp1,hsp:sp; ok:boolean; sepsy:symbol; lip:ip;
- oksys:sos;
-begin insym; nextif(lbrack,+034); hsp:=nil;
- repeat lsp:=newsp(artyp,0); initpos(lsp^.arpos);
- lsp^.aeltype:=hsp; hsp:=lsp; {link reversed}
- if artyp=carray then
- begin sepsy:=semicolon; oksys:=[ident];
- lip:=newident(carrbnd,lsp,nil,+035); if lip<>nil then enterid(lip);
- nextif(colon2,+036);
- lip:=newident(carrbnd,lsp,lip,+037); if lip<>nil then enterid(lip);
- nextif(colon1,+038); lsp1:=typid(+039);
- ok:=nicescalar(desub(lsp1));
- end
- else
- begin sepsy:=comma; oksys:=[ident..lparent];
- lsp1:=simpletyp(fsys+[comma,rbrack,ofsy,ident..packedsy]);
- ok:=bounded(lsp1)
- end;
- if not ok then begin error(+040); lsp1:=nil end;
- lsp^.inxtype:=lsp1
- until endofloop(fsys+[rbrack,ofsy,ident..packedsy],oksys,
- sepsy,+041); {+042}
- nextif(rbrack,+043); nextif(ofsy,+044);
- lsp:=element(fsys);
- if lsp<>nil then sflag:=sflag + lsp^.sflag * [withfile];
- repeat {reverse links and compute size}
- lsp1:=hsp^.aeltype; hsp^.aeltype:=lsp; hsp^.sflag:=sflag;
- if artyp=arrays then hsp^.size:=arraysize(hsp,spack in sflag);
- lsp:=hsp; hsp:=lsp1
- until hsp=nil; {lsp points to array with highest dimension}
- arraytyp:=lsp
-end;
-
-function typ(fsys:sos):sp;
-var lsp,lsp1:sp; off,sz,min,errno:integer;
- sflag:sflagset; lnp:np;
-
-function fldlist(fsys:sos):sp;
- {level 2: << typ}
-var fip,hip,lip:ip; lsp:sp;
-
-function varpart(fsys:sos):sp;
- {level 3: << fldlist << typ}
-var tip,lip:ip; lsp,headsp,hsp,vsp,tsp,tsp1,tfsp:sp;
- minoff,maxoff,int,nvar:integer; lid:idarr;
-begin insym; tip:=nil; lip:=nil;
- tsp:=newsp(tag,0);
- if sy<>ident then error(+045) else
- begin lid:=id; insym;
- if sy=colon1 then
- begin tip:=newip(field,lid,nil,nil); enterid(tip); insym;
- if sy<>ident then error(+046) else
- begin lid:=id; insym end;
- end;
- if sy=ofsy then {otherwise you may destroy id}
- begin id:=lid; lip:=searchid([types]) end;
- end;
- if lip=nil then tfsp:=nil else tfsp:=lip^.idtype;
- if bounded(tfsp) then
- begin bounds(tfsp,int,nvar); nvar:=nvar-int+1 end
- else
- begin nvar:=0; if tfsp<>nil then begin error(+047); tfsp:=nil end end;
- tsp^.tfldsp:=tfsp;
- if tip<>nil then {explicit tag}
- begin tip^.idtype:=tfsp;
- tip^.foffset:=posaddr(off,tfsp,spack in sflag)
- end;
- nextif(ofsy,+048); minoff:=off; maxoff:=minoff; headsp:=nil;
- repeat hsp:=nil; {for each caselabel list}
- repeat nvar:=nvar-1;
- int:=cstinteger(fsys+[ident..plussy,comma,colon1,lparent,
- semicolon,casesy,rparent],tfsp,+049);
- lsp:=headsp; {each label may occur only once}
- while lsp<>nil do
- begin if lsp^.varval=int then error(+050);
- lsp:=lsp^.nxtvar
- end;
- vsp:=newsp(variant,0); vsp^.varval:=int;
- vsp^.nxtvar:=headsp; headsp:=vsp; {chain of case labels}
- vsp^.subtsp:=hsp; hsp:=vsp;
- {use this field to link labels with same variant}
- until endofloop(fsys+[colon1,lparent,semicolon,casesy,rparent],
- [ident..plussy],comma,+051); {+052}
- nextif(colon1,+053); nextif(lparent,+054);
- tsp1:=fldlist(fsys+[rparent,semicolon,ident..plussy]);
- if off>maxoff then maxoff:=off;
- while vsp<>nil do
- begin vsp^.size:=off; hsp:=vsp^.subtsp;
- vsp^.subtsp:=tsp1; vsp:=hsp
- end;
- nextif(rparent,+055);
- off:=minoff;
- until lastsemicolon(fsys,[ident..plussy],+056); {+057 +058}
- if nvar>0 then error(-(+059));
- tsp^.fstvar:=headsp; tsp^.size:=minoff; off:=maxoff; varpart:=tsp;
-end;
-
-begin {fldlist}
- if find2([ident],fsys+[casesy],+060) then
- repeat lip:=nil; hip:=nil;
- repeat fip:=newident(field,nil,nil,+061);
- if fip<>nil then
- begin enterid(fip);
- if lip=nil then hip:=fip else lip^.next:=fip; lip:=fip;
- end;
- until endofloop(fsys+[colon1,ident..packedsy,semicolon,casesy],
- [ident],comma,+062); {+063}
- nextif(colon1,+064);
- lsp:=typ(fsys+[casesy,semicolon]);
- if lsp<>nil then if withfile in lsp^.sflag then
- sflag:=sflag+[withfile];
- while hip<>nil do
- begin hip^.idtype:=lsp;
- hip^.foffset:=posaddr(off,lsp,spack in sflag);
- hip:=hip^.next
- end;
- until lastsemicolon(fsys+[casesy],[ident],+065); {+066 +067}
- if sy=casesy then fldlist:=varpart(fsys) else fldlist:=nil;
-end;
-
-
-begin {typ}
- sflag:=[]; lsp:=nil;
- if sy=packedsy then begin sflag:=[spack]; insym end;
- if find1([ident..filesy],fsys,+068) then
- if sy in [ident..arrow] then
- begin if spack in sflag then error(+069);
- if sy=arrow then
- begin lsp:=newsp(pointer,sz_addr); insym;
- if not intypedec then lsp^.eltype:=typid(+070) else
- if sy<>ident then error(+071) else
- begin fwptr:=newip(types,id,lsp,fwptr); insym end
- end
- else lsp:=simpletyp(fsys);
- end
- else
- case sy of
-{<<<<<<<<<<<<}
-arraysy:
- lsp:=arraytyp(fsys,arrays,sflag,typ);
-recordsy:
- begin insym;
- new(lnp,rec); lnp^.occur:=rec; lnp^.nlink:=top; lnp^.fname:=nil; top:=lnp;
- off:=0; lsp1:=fldlist(fsys+[endsy]); {fldlist updates off}
- lsp:=newsp(records,off); lsp^.tagsp:=lsp1;
- lsp^.fstfld:=top^.fname; lsp^.sflag:=sflag;
- top:=top^.nlink; nextif(endsy,+072)
- end;
-setsy:
- begin insym; nextif(ofsy,+073);
- lsp:=simpletyp(fsys); lsp1:=desub(lsp); errno:=0;
- if bounded(lsp1) then
- begin bounds(lsp1,min,sz);
- if sz div NB1>=sz_mset then errno:=+074
- end
- else if bounded(lsp) then {subrange of integer}
- begin bounds(lsp,min,sz);
- if (min<0) or (sz>=iopt) then errno:=+075;
- sz:=iopt-1
- end
- else if lsp=intptr then
- begin sz:=iopt-1; errno:=-(+076) end
- else
- errno:=+077;
- if errno<>0 then
- begin error(errno); if errno>0 then begin lsp1:=nil; sz:=0 end end;
- lsp:=newsp(power,sz div NB1 +1); lsp^.elset:=lsp1;
- end;
-filesy:
- begin insym; nextif(ofsy,+078); lsp1:=typ(fsys);
- if lsp1<>nil then if withfile in lsp1^.sflag then error(-(+079));
- sz:=sizeof(lsp1,wordpart); if sz<sz_buff then sz:=sz_buff;
- lsp:=newsp(files,sz+sz_head); lsp^.filtype:=lsp1;
- end;
-{>>>>>>>>>>>>}
- end; {case}
- typ:=lsp;
-end;
-
-function vpartyp(fsys:sos):sp;
-begin
- if find2([arraysy],fsys+[ident],+080) then
- vpartyp:=arraytyp(fsys,carray,[],vpartyp)
- else
- vpartyp:=typid(+081)
-end;
-
-{===================================================================}
-
-procedure block(fsys:sos; fip:ip); forward;
- {pfdeclaration calls block. With a more obscure lexical
- structure this forward declaration can be avoided}
-
-procedure labeldeclaration(fsys:sos);
-var llp:lp;
-begin with b do begin
- repeat
- if sy<>intcst then error(+082) else
- begin
- if searchlab(lchain,val)<>nil then errint(+083,val) else
- begin new(llp); llp^.labval:=val;
- if val>9999 then teststandard;
- ilbno:=ilbno+1; llp^.labname:=ilbno; llp^.labdlb:=0;
- llp^.seen:=false; llp^.nextlp:=lchain; lchain:=llp;
- end;
- insym
- end
- until endofloop(fsys+[semicolon],[intcst],comma,+084); {+085}
- nextif(semicolon,+086)
-end end;
-
-procedure constdefinition(fsys:sos);
-var lip:ip;
-begin
- repeat lip:=newident(konst,nil,nil,+087);
- if lip<>nil then
- begin nextif(eqsy,+088);
- constant(fsys+[semicolon,ident],lip^.idtype,lip^.value);
- nextif(semicolon,+089); enterid(lip);
- end;
- until not find2([ident],fsys,+090);
-end;
-
-procedure typedefinition(fsys:sos);
-var lip:ip;
-begin fwptr:=nil; intypedec:=true;
- repeat lip:=newident(types,nil,nil,+091);
- if lip<>nil then
- begin nextif(eqsy,+092);
- lip^.idtype:=typ(fsys+[semicolon,ident]);
- nextif(semicolon,+093); enterid(lip);
- end;
- until not find2([ident],fsys,+094);
- assert sy<>ident;
- while fwptr<>nil do
- begin
- id:=fwptr^.name; lip:=searchid([types]);
- fwptr^.idtype^.eltype:=lip^.idtype; fwptr:=fwptr^.next
- end;
- intypedec:=false;
-end;
-
-procedure vardeclaration(fsys:sos);
-var lip,hip,vip:ip; lsp:sp;
-begin
- repeat hip:=nil; lip:=nil;
- repeat vip:=newident(vars,nil,nil,+095);
- if vip<>nil then
- begin enterid(vip); vip^.iflag:=[];
- if lip=nil then hip:=vip else lip^.next:=vip; lip:=vip;
- end;
- until endofloop(fsys+[colon1,ident..packedsy],[ident],comma,+096); {+097}
- nextif(colon1,+098);
- lsp:=typ(fsys+[semicolon,ident]);
- while hip<>nil do
- begin hip^.idtype:=lsp;
- if level<=1 then
- hip^.vpos.ad:=posaddr(holeb,lsp,false)
- else
- hip^.vpos.ad:=negaddr(lsp);
- hip:=hip^.next
- end;
- nextif(semicolon,+099);
- until not find2([ident],fsys,+0100);
-end;
-
-procedure pfhead(fsys:sos;var fip:ip;var again:boolean;param:boolean);
- forward;
-
-procedure parlist(fsys:sos; slink:boolean; var tip:ip; var maxlb:integer);
-var lastip,hip,lip,pip:ip; lsp,tsp:sp; iflag:iflagset; again:boolean;
-begin tip:=nil; lastip:=nil;
- maxlb:=0; if slink then maxlb:=sz_addr;
- repeat {once for each formal-parameter-section}
- if find1([ident,varsy,procsy,funcsy],fsys+[semicolon],+0101) then
- begin
- if (sy=procsy) or (sy=funcsy) then
- begin
- pfhead(fsys+[semicolon,ident,varsy,procsy,funcsy],hip,again,true);
- hip^.pfpos.ad:=posaddr(maxlb,procptr,false);
- hip^.pfkind:=formal; lip:=hip;
- top:=top^.nlink; level:=level-1
- end
- else
- begin hip:=nil; lip:=nil; iflag:=[assigned];
- if sy=varsy then
- begin iflag:=[refer,assigned,used]; insym end;
- repeat pip:=newident(vars,nil,nil,+0102);
- if pip<>nil then
- begin enterid(pip); pip^.iflag:=iflag;
- if lip=nil then hip:=pip else lip^.next:=pip; lip:=pip;
- end;
- iflag:=iflag+[samesect];
- until endofloop(fsys+[semicolon,colon1],[ident],comma,+0103);
- {+0104}
- nextif(colon1,+0105);
- if refer in iflag then
- begin lsp:=vpartyp(fsys+[semicolon]); tsp:=lsp;
- while formof(tsp,[carray]) do
- begin tsp^.arpos.ad:=posaddr(maxlb,nilptr,false);
- tsp:=tsp^.aeltype
- end;
- tsp:=nilptr;
- end
- else
- begin lsp:=typid(+0106); tsp:=lsp end;
- pip:=hip;
- while pip<>nil do
- begin pip^.vpos.ad:=posaddr(maxlb,tsp,false); pip^.idtype:=lsp;
- pip:=pip^.next
- end;
- end;
- if lastip=nil then tip:=hip else lastip^.next:=hip; lastip:=lip;
- end;
- until endofloop(fsys,[ident,varsy,procsy,funcsy],semicolon,+0107); {+0108}
-end;
-
-procedure pfhead; {forward declared}
-var lip:ip; lsp:sp; lnp:np; kl:idclass;
-begin lip:=nil; again:=false;
- if sy=procsy then kl:=proc else
- begin kl:=func; fsys:=fsys+[colon1,ident] end;
- insym;
- if sy<>ident then begin error(+0109); id:=spaces end;
- if not param then lip:=searchsection(top^.fname);
- if lip<>nil then
- if (lip^.klass<>kl) or (lip^.pfkind<>forward) then errid(+0110,id) else
- begin b.forwcount:=b.forwcount-1; again:=true end;
- if again then insym else
- begin lip:=newip(kl,id,nil,nil);
- if sy=ident then begin enterid(lip); insym end;
- lastpfno:=lastpfno+1; lip^.pfno:=lastpfno;
- end;
- level:=level+1;
- new(lnp,blck); lnp^.occur:=blck; lnp^.nlink:=top; top:=lnp;
- if again then lnp^.fname:=lip^.parhead else
- begin lnp^.fname:=nil;
- if find3(lparent,fsys,+0111) then
- begin parlist(fsys+[rparent],lip^.pfpos.lv>1,lip^.parhead,lip^.maxlb);
- nextif(rparent,+0112)
- end;
- end;
- if (kl=func) and not again then
- begin nextif(colon1,+0113); lsp:=typid(+0114);
- if formof(lsp,[power..tag]) then
- begin error(+0115); lsp:=nil end;
- lip^.idtype:=lsp;
- end;
- fip:=lip;
-end;
-
-procedure pfdeclaration(fsys:sos);
-var lip:ip; again,headonly:boolean; markp:^integer; lbp:bp; kind:kindofpf;
-begin with b do begin
- pfhead(fsys+[ident,semicolon,labelsy..beginsy],lip,again,false);
- nextif(semicolon,+0116);
- if find1([ident,labelsy..beginsy],fsys+[semicolon],+0117) then
- begin headonly:=sy=ident;
- if headonly then
- begin kind:=standard;
- if id='forward ' then kind:=forward else
- if id='extern ' then kind:=extern else
- if id='varargs ' then kind:=varargs else errid(+0118,id);
- if kind<>standard then
- begin insym; lip^.pfkind:=kind;
- if kind=forward then
- if again then errid(+0119,lip^.name) else
- forwcount:=forwcount+1
- else
- begin lip^.pfpos.lv:=1; teststandard end
- end;
- end;
- if not again then
- if lip^.pfpos.lv<=1 then genpnam(ps_exp,lip) else genpnam(ps_inp,lip);
- if not headonly then
- begin lip^.pfkind:=actual;
-#ifndef STANDARD
- mark(markp);
-#endif
- new(lbp); lbp^:=b; nextbp:=lbp;
- reglb:=0; minlb:=0; ilbno:=0; forwcount:=0; lchain:=nil;
- block(fsys+[semicolon],lip);
- b:=nextbp^;
-#ifndef STANDARD
- release(markp);
-#endif
- end;
- end;
- if not main then eofexpected:=forwcount=0;
- nextif(semicolon,+0120);
- level:=level-1; top:=top^.nlink;
-end end;
-
-{===================================================================}
-
-procedure expression(fsys:sos); forward;
- {this forward declaration cannot be avoided}
-
-procedure selectarrayelement(fsys:sos);
-var isp,lsp:sp;
-begin
- repeat loadaddr; isp:=nil;
- if formof(a.asp,[arrays,carray]) then isp:=a.asp^.inxtype else
- errasp(+0121);
- lsp:=a.asp;
- expression(fsys+[comma]); force(desub(isp),+0122);
- {no range check}
- if lsp<>nil then
- begin a.packbit:=spack in lsp^.sflag;
- descraddr(lsp^.arpos); lsp:=lsp^.aeltype
- end;
- a.asp:=lsp; a.ak:=indexed;
- until endofloop(fsys,[notsy..lparent],comma,+0123); {+0124}
-end;
-
-procedure selector(fsys: sos; fip:ip; iflag:iflagset);
-{selector computes the address of any kind of variable.
- Four possibilities:
- 1.for direct accessable variables (fixed), a contains offset and level,
- 2.for indirect accessable variables (ploaded), the address is on the stack.
- 3.for array elements, the top of stack gives the index (one word).
- The address of the array is beneath it.
- 4.for variables with address in direct accessible pointer variable (pfixed),
- the offset and level of the pointer is stored in a.
- If a.asp=nil then an error occurred else a.asp gives
- the type of the variable.
-}
-var lip:ip;
-begin inita(fip^.idtype,0);
- case fip^.klass of
- vars: with a do
- begin pos:=fip^.vpos; if refer in fip^.iflag then ak:=pfixed end;
- field:
- begin a:=lastnp^.wa; fieldaddr(fip^.foffset); a.asp:=fip^.idtype end;
- func: with a do
- if fip^.pfkind=standard then errasp(+0125) else
- if (fip^.pfpos.lv>=level-1) and (fip<>currproc) then error(+0126) else
- if fip^.pfkind<>actual then error(+0127) else
- begin pos:=fip^.pfpos; pos.lv:=pos.lv+1;
- if sy=arrow then error(+0128);
- end
- end; {case}
- if (sy=lbrack) or (sy=period) then iflag:=iflag+[noreg];
- while find2([lbrack,period,arrow],fsys,+0129) do with a do
- if sy=lbrack then
- begin insym; selectarrayelement(fsys+[rbrack,lbrack,period,arrow]);
- nextif(rbrack,+0130);
- end else
- if sy=period then
- begin insym;
- if sy<>ident then error(+0131) else
- begin
- if not formof(asp,[records]) then errasp(+0132) else
- begin lip:=searchsection(asp^.fstfld);
- if lip=nil then begin errid(+0133,id); asp:=nil end else
- begin packbit:=spack in asp^.sflag;
- fieldaddr(lip^.foffset); asp:=lip^.idtype
- end
- end;
- insym
- end
- end
- else
- begin insym; iflag:=[used];
- if asp<>nil then
- if asp=zeroptr then errasp(+0134) else
- if asp^.form=pointer then
- begin
- if ak=fixed then ak:=pfixed else
- begin load; ak:=ploaded end;
- asp:=asp^.eltype
- end else
- if asp^.form=files then
- begin loadaddr; gensp(WDW,sz_addr); gencst(op_lfr,sz_addr);
- asp:=asp^.filtype; ak:=ploaded; packbit:=true;
- end
- else errasp(+0135);
- end;
- fip^.iflag:=fip^.iflag+iflag;
-end;
-
-procedure variable(fsys:sos);
-var lip: ip;
-begin
- if sy=ident then
- begin lip:=searchid([vars,field]); insym;
- selector(fsys,lip,[used,assigned,noreg])
- end
- else begin error(+0136); inita(nil,0) end;
-end;
-
-{===================================================================}
-
-function plistequal(p1,p2:ip):boolean;
-var ok:boolean; q1,q2:sp;
-begin plistequal:=eqstruct(p1^.idtype,p2^.idtype);
- p1:=p1^.parhead; p2:=p2^.parhead;
- while (p1<>nil) and (p2<>nil) do
- begin ok:=false;
- if p1^.klass=p2^.klass then
- if p1^.klass<>vars then ok:=plistequal(p1,p2) else
- begin q1:=p1^.idtype; q2:=p2^.idtype; ok:=true;
- while ok and formof(q1,[carray]) and formof(q2,[carray]) do
- begin ok:=eqstruct(q1^.inxtype,q2^.inxtype);
- q1:=q1^.aeltype; q2:=q2^.aeltype;
- end;
- if not (eqstruct(q1,q2) and
- (p1^.iflag*[refer,samesect] = p2^.iflag*[refer,samesect]))
- then ok:=false;
- end;
- if not ok then plistequal:=false;
- p1:=p1^.next; p2:=p2^.next
- end;
- if (p1<>nil) or (p2<>nil) then plistequal:=false
-end;
-
-procedure callnonstandard(fsys:sos; moreargs:boolean; fip:ip);
-var nxt,lip:ip; l0,l1,l2,l3,sz:integer; lsp,savasp:sp;
-begin with a do begin
- l0:=newmark; l1:=newmark; sz:=0; nxt:=fip^.parhead;
- while moreargs do
- begin
- if nxt=nil then
- begin if fip^.pfkind<>varargs then error(+0137);
- expression(fsys); load; sz:=sz+sizeof(asp,wordmult)
- end
- else
- begin lsp:=nxt^.idtype;
- if nxt^.klass<>vars then {proc or func}
- begin inita(procptr,0); sz:=sz+sz_proc;
- if sy<>ident then error(+0138) else
- begin lip:=searchid([nxt^.klass]); insym;
- if lip^.pfkind=standard then error(+0139) else
- if not plistequal(nxt,lip) then error(+0140)
- else
- begin pos:=lip^.pfpos;
- if lip^.pfkind=formal then load else
- begin
- if lip^.pfpos.lv<=1 then gencst(op_zer,sz_addr) else
- gencst(op_lxl,level-lip^.pfpos.lv);
- genpnam(op_lpi,lip)
- end
- end
- end
- end
- else if not (refer in nxt^.iflag) then {call by value}
- begin expression(fsys); force(lsp,+0141);
- sz:=sz+sizeof(asp,wordmult);
- end
- else {call by reference}
- begin variable(fsys); loadaddr; sz:=sz+sz_addr;
- if samesect in nxt^.iflag then lsp:=savasp else
- begin savasp:=asp; l2:=newmark;
- while formof(lsp,[carray])
- and formof(asp,[arrays,carray]) do
- if (compat(lsp^.inxtype,asp^.inxtype) > subeq) or
- (lsp^.sflag<>asp^.sflag) then errasp(+0142) else
- begin l3:=newmark; descraddr(asp^.arpos); exchange(l2,l3);
- relmark(l3);
- sz:=sz+sz_addr; asp:=asp^.aeltype; lsp:=lsp^.aeltype
- end;
- relmark(l2)
- end;
- if not eqstruct(asp,lsp) then errasp(+0143);
- if packbit then errasp(+0144);
- end;
- nxt:=nxt^.next
- end;
- exchange(l0,l1);
- relmark(l1);
- l1:=newmark; moreargs:=find3(comma,fsys,+0145)
- end;
- relmark(l0); relmark(l1);
- if nxt<>nil then error(+0146);
- inita(procptr,0); pos:=fip^.pfpos;
- if fip^.pfkind=formal then
- with b do
- begin load; ilbno:=ilbno+2;
- gencst(op_exg,sz_addr);
- gencst(op_dup,sz_addr);
- gencst(op_zer,sz_addr);
- genop(op_cmp);
- gencst(op_zeq,ilbno-1);
- gencst(op_exg,sz_addr);
- genop(op_cai);
- gencst(op_asp,sz_addr);
- gencst(op_bra,ilbno);
- newilb(ilbno-1);
- gencst(op_asp,sz_addr);
- genop(op_cai);
- newilb(ilbno);
- end
- else
- begin
- if pos.lv>1 then
- begin gencst(op_lxl,level-pos.lv); sz:=sz+sz_addr end;
- genpnam(op_cal,fip)
- end;
- if sz<>0 then gencst(op_asp,sz);
- asp:=fip^.idtype;
- if asp<>nil then genasp(op_lfr);
- if (fip^.pfkind = extern) and (opt['l'] <> off) then
- begin genop(op_fil); argdlb(fildlb) end;
- genlin
-end end;
-
-procedure fileaddr;
-var la:attr;
-begin la:=a; a:=fa; loadaddr; a:=la end;
-
-procedure callr(l1,l2:integer);
-var la:attr; m:libmnem;
-begin with a do begin
- la:=a; asp:=desub(asp); fileaddr; m:=RDI;
- if asp<>intptr then
- if asp=charptr then m:=RDC else
- if asp=realptr then m:=RDR else
- if asp=longptr then m:=RDL else errasp(+0147);
- gensp(m,sz_addr); genasp(op_lfr);
- if asp<>la.asp then checkbnds(la.asp);
- a:=la; exchange(l1,l2); store;
-end end;
-
-procedure callw(fsys:sos; l1,l2:integer);
-var m:libmnem; s:integer;
-begin with a do begin
- fileaddr; exchange(l1,l2); loadcheap; asp:=desub(asp);
- if string(asp) then
- begin gencst(op_loc,asp^.size); m:=WRS; s:=sz_addr+sz_word end
- else
- begin m:=WRI; s:=sizeof(asp,wordmult);
- if asp<>intptr then
- if asp=charptr then m:=WRC else
- if asp=realptr then m:=WRR else
- if asp=boolptr then m:=WRB else
- if asp=zeroptr then m:=WRZ else
- if asp=longptr then m:=WRL else errasp(+0148);
- end;
- if find3(colon1,fsys,+0149) then
- begin expression(fsys+[colon1]); force(intptr,+0150);
- m:=succ(m); s:=s+sz_int
- end;
- if find3(colon1,fsys,+0151) then
- begin expression(fsys); force(intptr,+0152); s:=s+sz_int;
- if m<>WSR then error(+0153) else m:=WRF;
- end;
- gensp(m,s+sz_addr);
-end end;
-
-procedure callrw(fsys:sos; lpar,w,ln:boolean);
-var l1,l2,errno:integer; ftype,lsp,fsp:sp; (* savlb:integer;*) m:libmnem;
-begin with b do begin (* savlb:=reglb; *) ftype:=textptr;
- inita(textptr,argv[ord(w)].ad); a.pos.lv:=0; fa:=a;
- if lpar then
- begin l1:=newmark; if w then expression(fsys+[colon1]) else variable(fsys);
- l2:=newmark;
- if formof(a.asp,[files]) then
- begin ftype:=a.asp;
- if (a.ak<>fixed) and (a.ak<>pfixed) then
- begin loadaddr; temporary(nilptr,reg_pointer);
- store; a.ak:=pfixed
- end;
- fa:=a; {store does not change a}
- if (sy<>comma) and not ln then error(+0154);
- end
- else
- begin if iop[w]=nil then error(+0155);
- if w then callw(fsys,l1,l2) else callr(l1,l2)
- end;
- relmark(l1); relmark(l2);
- while find3(comma,fsys,+0156) do with a do
- begin l1:=newmark;
- if w then expression(fsys+[colon1]) else variable(fsys);
- l2:=newmark;
- if ftype=textptr then
- if w then callw(fsys,l1,l2) else callr(l1,l2)
- else
- begin errno:=+0157; fsp:=ftype^.filtype;
- if w then force(fsp,errno) else
- begin store; lsp:=asp; relmark(l2); l2 := newmark end;
- fileaddr; gensp(WDW,sz_addr); gencst(op_lfr,sz_addr);
- ak:=ploaded; packbit:=true; asp:=fsp;
- if w then store else
- begin force(lsp,errno); exchange(l1,l2) end;
- fileaddr; if w then m:=PUTX else m:=GETX; gensp(m,sz_addr)
- end;
- relmark(l1); relmark(l2);
- end;
- end
- else
- if not ln then error(+0158) else
- if iop[w]=nil then error(+0159);
- if ln then
- begin if ftype<>textptr then error(+0160);
- fileaddr; if w then m:=WLN else m:=RLN; gensp(m,sz_addr)
- end;
- (* reglb:=savlb *)
-end end;
-
-procedure callnd(fsys:sos);
-label 1;
-var lsp:sp; int:integer;
-begin with a do begin
- if asp=zeroptr then errasp(+0161) else asp:=asp^.eltype;
- while find3(comma,fsys,+0162) do
- begin
- if asp<>nil then {asp of form record or variant}
- if asp^.form=records then asp:=asp^.tagsp else
- if asp^.form=variant then asp:=asp^.subtsp else errasp(+0163);
- if asp=nil then constant(fsys,lsp,int) else
- begin assert asp^.form=tag;
- int:=cstinteger(fsys,asp^.tfldsp,+0164); lsp:=asp^.fstvar;
- while lsp<>nil do
- if lsp^.varval<>int then lsp:=lsp^.nxtvar else
- begin asp:=lsp; goto 1 end;
- end;
-1: end;
- genasp(op_loc)
-end end;
-
-procedure call(fsys: sos; fip: ip);
-var lkey: standpf; lpar:boolean; lsp,sp1,sp2:sp;
- m:libmnem; s:integer; b:byte;
-begin with a do begin fsys:=fsys+[comma];
- lpar:=find3(lparent,fsys,+0165); if lpar then fsys:=fsys+[rparent];
- if fip^.pfkind<>standard then callnonstandard(fsys,lpar,fip) else
- begin lkey:=fip^.key; m:=CLS; lsp:=nil;
- if not lpar then
- if lkey in [pput..prelease,fabs..fatn] then error(+0166);
- if lkey in [pput..ppage,feof,feoln] then
- begin s:=sz_addr;
- if lpar then
- begin variable(fsys); loadaddr end
- else
- begin asp:=textptr;
- if iop[lkey=ppage]=nil then errasp(+0167) else
- gencst(op_lae,argv[ord(lkey=ppage)].ad)
- end;
- if lkey in [pput..prewrite,ppage,feof,feoln] then
- if not formof(asp,[files]) then
- begin error(+0168); asp:=textptr end;
- if lkey in [pnew,pdispose,pmark,prelease] then
- if not formof(asp,[pointer]) then
- begin error(+0169); asp:=nilptr end;
- end;
- case lkey of
- pread, preadln, pwrite, pwriteln: {0,1,2,3 resp}
- callrw(fsys,lpar,lkey>=pwrite,odd(ord(lkey)));
- pput: m:=PUTX;
- pget: m:=GETX;
- ppage: m:=PAG;
- preset: m:=OPN;
- prewrite: m:=CRE;
- pnew: m:=NEWX;
- pdispose: m:=DIS;
- ppack:
- begin sp2:=asp; nextif(comma,+0170); expression(fsys); load;
- lsp:=asp; nextif(comma,+0171); variable(fsys); loadaddr;
- sp1:=asp; asp:=lsp; m:=PAC
- end;
- punpack:
- begin sp1:=asp; nextif(comma,+0172); variable(fsys); loadaddr;
- sp2:=asp; nextif(comma,+0173); expression(fsys); load;
- m:=UNP
- end;
- pmark: m:=SAV;
- prelease: m:=RST;
- phalt:
- begin m:=HLT; teststandard;
- if lpar then lsp:=intptr else gencst(op_loc,0);
- end;
- feof: m:=EFL;
- feoln: m:=ELN;
- fodd, fchr: lsp:=intptr;
- fpred: b:=op_dec;
- fsucc: b:=op_inc;
- fround: m:=RND;
- fsin, fcos, fexp, fsqt, flog, fatn: lsp:=realptr;
- fabs, fsqr, ford, ftrunc: ;
- end;
- if lpar then if lkey in [phalt,fabs..fatn] then
- begin expression(fsys);
- force(lsp,+0174); s:=sizeof(asp,wordmult)
- end;
- if lkey in [ppack,punpack,fabs..fodd] then
- asp:=desub(asp);
- case lkey of
- ppage, feoln:
- begin if asp<>textptr then error(+0175); asp:=boolptr end;
- preset, prewrite:
- begin s:=sz_addr+sz_word;
- if asp=textptr then gencst(op_loc,0) else
- gencst(op_loc,sizeof(asp^.filtype,wordpart));
- end;
- pnew, pdispose:
- begin callnd(fsys); s:=sz_addr+sz_word end;
- ppack, punpack:
- begin s:=2*sz_addr+sz_int;
- if formof(sp1,[arrays,carray])
- and formof(sp2,[arrays,carray]) then
- if (spack in (sp1^.sflag - sp2^.sflag)) and
- eqstruct(sp1^.aeltype,sp2^.aeltype) and
- eqstruct(desub(sp1^.inxtype),asp) and
- eqstruct(desub(sp2^.inxtype),asp) then
- begin descraddr(sp1^.arpos); descraddr(sp2^.arpos) end
- else error(+0176)
- else error(+0177)
- end;
- pmark, prelease: teststandard;
- feof: asp:=boolptr;
- fabs:
- if asp=intptr then m:=ABI else
- if asp=longptr then m:=ABL else
- if asp=realptr then m:=ABR else errasp(+0178);
- fsqr:
- begin
- if (asp=intptr) or (asp=longptr) then b:=op_mli else
- if asp=realptr then begin b:=op_mlf; fltused:=true end
- else errasp(+0179);
- genasp(op_dup); genasp(b)
- end;
- ford:
- begin if not nicescalar(asp) then errasp(+0180); asp:=intptr end;
- fchr: checkbnds(charptr);
- fpred, fsucc:
- begin genop(b);
- if nicescalar(asp) then genrck(asp) else errasp(+0181)
- end;
- fodd:
- begin gencst(op_loc,1); asp:=boolptr; genasp(op_and) end;
- ftrunc, fround: if asp<>realptr then errasp(+0182);
- fsin: m:=SINX;
- fcos: m:=COSX;
- fexp: m:=EXPX;
- fsqt: m:=SQT;
- flog: m:=LOG;
- fatn: m:=ATN;
- phalt:s:=0;
- pread, preadln, pwrite, pwriteln, pput, pget: ;
- end;
- if m<>CLS then
- begin gensp(m,s);
- if lkey>=feof then genasp(op_lfr)
- end;
- if (lkey=fround) or (lkey=ftrunc) then
- opconvert(ri);
- end;
- if lpar then nextif(rparent,+0183);
-end end;
-
-{===================================================================}
-
-procedure convert(fsp:sp; l1:integer);
-{Convert tries to make the operands of some operator of the same type.
- The operand types are given by fsp and a.asp. The resulting type
- is put in a.asp.
- l1 gives the lino of the first instruction of the right operand.
-}
-var l2:integer; ts:twostruct; lsp:sp;
-begin with a do begin asp:=desub(asp);
- ts:=compat(asp,fsp);
- case ts of
- eq,subeq:
- ;
- il,ir,lr:
- opconvert(ts);
- es:
- expandnullset(fsp);
- li,ri,rl,se:
- begin l2:=newmark; lsp:=asp; asp:=fsp;
- convert(lsp,l1); exchange(l1,l2); relmark(l2); asp:=lsp
- end;
- noteq:
- errasp(+0184);
- end;
- if asp=realptr then fltused:=true
-end end;
-
-procedure buildset(fsys:sos);
-{This is a bad construct in pascal. Two objections:
- - expr..expr very difficult to implement on most machines
- - this construct makes it hard to implement sets of different size
-}
-const ncsb = 32; {tunable}
-type byteset = set of 0..MB1;
-var i,j,val1,val2,ncst,l1,l2,sz:integer;
- cst1,cst2,cst12,varpart:boolean;
- cstpart:array[1..ncsb] of byteset;
-
-procedure genconstset(sz:integer);
- {level 2: << buildset}
-var i,j:integer;
-
-function setcode(s:byteset):byte;
- {level 3: << buildset}
-var b,i,w:byte;
-begin i:=0; w:=0; b:=1;
- for i:=0 to MB1 do
- begin if i in s then w:=w+b; b:=b+b end;
- setcode := w;
-end;
-
-begin
- i:=sz;
- repeat
- genop(op_loc); j:=i; i:=i-sz_word;
-
- {the bytes of the next word to be loaded on the stack}
- {are in cstpart[i+1] .. cstpart[j]}
- while (cstpart[j] = []) and (j > i+1) do j:=j-1;
- if j = i+1 then argcst(setcode(cstpart[j]))
- else
- begin
- if (j = i+2) and ((sz_word <= 2) or not (MB1 in cstpart[j])) then put1(sp_cst2)
- else begin j:=i+4; put1(sp_cst4) end;
- for j:=i+1 to j do put1(setcode(cstpart[j]))
- end;
- until i = 0;
-end;
-
-procedure setexpr(fsys:sos; var c:boolean; var v:integer);
- {level 2: << buildset}
-var min:integer; lsp:sp;
-begin with a do begin c:=false; v:=0; lsp:=asp;
- expression(fsys); asp:=desub(asp);
- if not eqstruct(asp,lsp^.elset) then
- begin error(+0185); lsp:=nullset end;
- if lsp=nullset then
- begin
- if bounded(asp) then bounds(asp,min,sz) else
- if asp=intptr then sz:=iopt-1 else begin errasp(+0186); sz:=0 end;
- sz:=sz div NB1 + 1; while sz mod sz_word <> 0 do sz:=sz+1;
- if sz>sz_mset then errasp(+0187);
- lsp:=newsp(power,sz); lsp^.elset:=asp
- end;
- if asp<>nil then if ak=cst then
- if (pos.ad<0) or (pos.ad div NB1>=sizeof(lsp,wordmult)) then
- error(+0188)
- else if sz<=ncsb*sz_byte then
- begin c:=true; v:=pos.ad end;
- if not c then load; asp:=lsp
-end end;
-
-begin with a do begin {buildset}
- varpart:=false; ncst:=0; asp:=nullset;
- for i:=1 to ncsb do cstpart[i]:=[];
- if find2([notsy..lparent],fsys,+0189) then
- repeat l1:=newmark;
- setexpr(fsys+[colon2,comma],cst1,val1); cst12:=cst1;
- if find3(colon2,fsys+[comma,notsy..lparent],+0190) then
- begin setexpr(fsys+[comma,notsy..lparent],cst2,val2);
- cst12:=cst12 and cst2;
- if not cst12 then
- begin
- if cst2 then gencst(op_loc,val2);
- if cst1 then
- begin l2:=newmark; gencst(op_loc,val1); exchange(l1,l2);
- relmark(l2);
- end;
- l2:=newmark; genasp(op_zer); exchange(l1,l2);
- relmark(l2);
- genasp(op_loc); gensp(BTS,3*sz_word)
- end;
- end
- else
- if cst12 then val2:=val1 else genasp(op_set);
- if cst12 then
- for i:=val1 to val2 do
- begin j:=i div NB1 + 1; ncst:=ncst+1;
- cstpart[j]:=cstpart[j] + [i mod NB1]
- end
- else
- if varpart then genasp(op_ior) else varpart:=true;
- relmark(l1);
- until endofloop(fsys,[notsy..lparent],comma,+0191); {+0192}
- ak:=loaded;
- if ncst>0 then
- begin
- genconstset(sizeof(asp,wordmult));
- if varpart then genasp(op_ior);
- end
- else
- if not varpart then genasp(op_zer); {empty set}
-end end;
-
-procedure factor(fsys: sos);
-var lip:ip; lsp:sp;
-begin with a do begin
- asp:=nil; packbit:=false; ak:=loaded;
- if find1([notsy..nilcst,lparent],fsys,+0193) then
- case sy of
- ident:
- begin lip:=searchid([konst,vars,field,func,carrbnd]); insym;
- case lip^.klass of
- func: {call moves result to top stack}
- begin call(fsys,lip); ak:=loaded; packbit:=false end;
- konst:
- begin asp:=lip^.idtype;
- if nicescalar(asp) then {including asp=nil}
- begin ak:=cst; pos.ad:=lip^.value end
- else
- begin ak:=ploaded; laedlb(abs(lip^.value));
- if asp^.form=scalar then
- begin load; if lip^.value<0 then negate end
- else
- if asp=zeroptr then ak:=loaded
- end
- end;
- field,vars:
- selector(fsys,lip,[used]);
- carrbnd:
- begin lsp:=lip^.idtype; assert formof(lsp,[carray]);
- descraddr(lsp^.arpos); lsp:=lsp^.inxtype; asp:=desub(lsp);
- if lip^.next=nil then ak:=ploaded {low bound} else
- begin gencst(op_loi,2*sz_int); genasp(op_adi) end;
- load; checkbnds(lsp);
- end;
- end {case}
- end;
- intcst:
- begin asp:=intptr; ak:=cst; pos.ad:=val; insym end;
- realcst:
- begin asp:=realptr; ak:=ploaded; laedlb(val); insym end;
- longcst:
- begin asp:=longptr; ak:=ploaded; laedlb(val); insym end;
- charcst:
- begin asp:=charptr; ak:=cst; pos.ad:=val; insym end;
- stringcst:
- begin asp:=stringstruct; laedlb(val); insym;
- if asp<>zeroptr then ak:=ploaded;
- end;
- nilcst:
- begin insym; asp:=nilptr; genasp(op_zer); end;
- lparent:
- begin insym; expression(fsys+[rparent]); nextif(rparent,+0194) end;
- notsy:
- begin insym; factor(fsys); load; genop(op_teq); asp:=desub(asp);
- if asp<>boolptr then errasp(+0195)
- end;
- lbrack:
- begin insym; buildset(fsys+[rbrack]); nextif(rbrack,+0196) end;
- end
-end end;
-
-procedure term(fsys:sos);
-var lsy:symbol; lsp:sp; l1:integer; first:boolean;
-begin with a,b do begin first:=true;
- factor(fsys+[starsy..andsy]);
- while find2([starsy..andsy],fsys,+0197) do
- begin if first then begin load; first:=false end;
- lsy:=sy; insym; l1:=newmark; lsp:=asp;
- factor(fsys+[starsy..andsy]); load; convert(lsp,l1);
- if asp<>nil then
- case lsy of
- starsy:
- if (asp=intptr) or (asp=longptr) then genasp(op_mli) else
- if asp=realptr then genasp(op_mlf) else
- if asp^.form=power then genasp(op_and) else errasp(+0198);
- slashsy:
- begin
- if (asp=intptr) or (asp=longptr) then
- begin lsp:=asp;
- convert(realptr,l1); {make real of right operand}
- convert(lsp,l1); {make real of left operand}
- end;
- if asp=realptr then genasp(op_dvf) else errasp(+0199);
- end;
- divsy:
- if (asp=intptr) or (asp=longptr) then genasp(op_dvi) else
- errasp(+0200);
- modsy:
- begin
- if asp=intptr then gensp(MDI,2*sz_int) else
- if asp=longptr then gensp(MDL,2*sz_long) else errasp(+0201);
- genasp(op_lfr);
- end;
- andsy:
- if asp=boolptr then genasp(op_and) else errasp(+0202);
- end; {case}
- relmark(l1)
- end {while}
-end end;
-
-procedure simpleexpression(fsys:sos);
-var lsy:symbol; lsp:sp; l1:integer; signed,min,first:boolean;
-begin with a do begin first:=true;
- signed:=(sy=plussy) or (sy=minsy);
- if signed then begin min:=sy=minsy; insym end else min:=false;
- term(fsys + [minsy,plussy,orsy]); lsp:=desub(asp);
- if signed then
- if (lsp<>intptr) and (lsp<>realptr) and (lsp<>longptr) then
- errasp(+0203)
- else if min then
- begin load; first:=false; asp:=lsp; negate end;
- while find2([plussy,minsy,orsy],fsys,+0204) do
- begin if first then begin load; first:=false end;
- lsy:=sy; insym; l1:=newmark; lsp:=asp;
- term(fsys+[minsy,plussy,orsy]); load; convert(lsp,l1);
- if asp<>nil then
- case lsy of
- plussy:
- if (asp=intptr) or (asp=longptr) then genasp(op_adi) else
- if asp=realptr then genasp(op_adf) else
- if asp^.form=power then genasp(op_ior) else errasp(+0205);
- minsy:
- if (asp=intptr) or (asp=longptr) then genasp(op_sbi) else
- if asp=realptr then genasp(op_sbf) else
- if asp^.form=power then begin genasp(op_com); genasp(op_and) end
- else errasp(+0206);
- orsy:
- if asp=boolptr then genasp(op_ior) else errasp(+0207);
- end; {case}
- relmark(l1)
- end {while}
-end end;
-
-procedure expression; { fsys:sos }
-var lsy:symbol; lsp:sp; l1,l2:integer;
-begin with a do begin l1:=newmark;
- simpleexpression(fsys+[eqsy..insy]);
- if find2([eqsy..insy],fsys,+0208) then
- begin lsy:=sy; insym; lsp:=asp; loadcheap; l2:=newmark;
- simpleexpression(fsys); loadcheap;
- if lsy=insy then
- begin
- if not formof(asp,[power]) then errasp(+0209) else
- if asp=nullset then genasp(op_and) else
- {this effectively replaces the word on top of the
- stack by the result of the 'in' operator: false }
- if not (compat(lsp,asp^.elset) <= subeq) then errasp(+0210) else
- begin exchange(l1,l2); genasp(op_inn) end
- end
- else
- begin convert(lsp,l2);
- if asp<>nil then
- case asp^.form of
- scalar:
- if asp=realptr then genasp(op_cmf) else genasp(op_cmi);
- pointer:
- if (lsy=eqsy) or (lsy=nesy) then genop(op_cmp) else
- errasp(+0211);
- power:
- case lsy of
- eqsy,nesy: genasp(op_cms);
- ltsy,gtsy: errasp(+0212);
- lesy: {'a<=b' equivalent to 'a-b=[]'}
- begin genasp(op_com); genasp(op_and); genasp(op_zer);
- genasp(op_cms); lsy:=eqsy
- end;
- gesy: {'a>=b' equivalent to 'a=a+b'}
- begin gencst(op_dup,2*sizeof(asp,wordmult));
- genasp(op_asp); genasp(op_ior);
- genasp(op_cms); lsy:=eqsy
- end
- end; {case}
- arrays:
- if string(asp) then
- begin gencst(op_loc,asp^.size);
- gensp(BCP,2*sz_addr+sz_word);
- gencst(op_lfr,sz_word)
- end
- else errasp(+0213);
- records: errasp(+0214);
- files: errasp(+0215)
- end; { case }
- case lsy of
- ltsy: genop(op_tlt);
- lesy: genop(op_tle);
- gtsy: genop(op_tgt);
- gesy: genop(op_tge);
- nesy: genop(op_tne);
- eqsy: genop(op_teq)
- end
- end;
- relmark(l2);
- asp:=boolptr; ak:=loaded
- end;
- relmark(l1)
-end end;
-
-{===================================================================}
-
-procedure statement(fsys:sos); forward;
- {this forward declaration can be avoided}
-
-procedure assignment(fsys:sos; fip:ip);
-var la:attr; l1,l2:integer;
-begin
- l1:=newmark; selector(fsys+[becomes],fip,[assigned]); l2:=newmark;
- la:=a; nextif(becomes,+0216);
- expression(fsys); loadcheap; checkasp(la.asp,+0217);
- exchange(l1,l2); a:=la;
- relmark(l1); relmark(l2);
- if not formof(la.asp,[arrays..records]) then store else
- begin loadaddr;
- if la.asp^.form<>carray then genasp(op_blm) else
- begin descraddr(la.asp^.arpos); gensp(ASZ,sz_addr);
- gencst(op_lfr,sz_word); gencst(op_bls,sz_word)
- end;
- end;
-end;
-
-procedure gotostatement;
-{jumps into structured statements can give strange results. }
-label 1;
-var llp:lp; lbp:bp; diff:integer;
-begin
- if sy<>intcst then error(+0218) else
- begin llp:=searchlab(b.lchain,val);
- if llp<>nil then gencst(op_bra,llp^.labname) else
- begin lbp:=b.nextbp; diff:=1;
- while lbp<>nil do
- begin llp:=searchlab(lbp^.lchain,val);
- if llp<>nil then goto 1;
- lbp:=lbp^.nextbp; diff:=diff+1;
- end;
-1: if llp=nil then errint(+0219,val) else
- begin
- if llp^.labdlb=0 then
- begin dlbno:=dlbno+1; llp^.labdlb:=dlbno;
- genop(ps_ina); argdlb(dlbno); {forward data reference}
- end;
- laedlb(llp^.labdlb);
- if diff=level-1 then gencst(op_zer,sz_addr) else
- gencst(op_lxl,diff);
- gensp(GTO,2*sz_addr);
- end;
- end;
- insym;
- end
-end;
-
-procedure compoundstatement(fsys:sos; err:integer);
-begin
- repeat statement(fsys+[semicolon])
- until endofloop(fsys,[beginsy..casesy],semicolon,err)
-end;
-
-procedure ifstatement(fsys:sos);
-var lb1,lb2:integer;
-begin with b do begin
- expression(fsys+[thensy,elsesy]);
- force(boolptr,+0220); ilbno:=ilbno+1; lb1:=ilbno; gencst(op_zeq,lb1);
- nextif(thensy,+0221); statement(fsys+[elsesy]);
- if find3(elsesy,fsys,+0222) then
- begin ilbno:=ilbno+1; lb2:=ilbno; gencst(op_bra,lb2);
- newilb(lb1); statement(fsys); newilb(lb2)
- end
- else newilb(lb1);
-end end;
-
-procedure casestatement(fsys:sos);
-label 1;
-type cip=^caseinfo;
- caseinfo=record
- next: cip;
- csstart: integer;
- cslab: integer
- end;
-var lsp:sp; head,p,q,r:cip; l0,l1:integer;
- ilb1,ilb2,dlb,i,n,m,min,max:integer;
-begin with b do begin
- expression(fsys+[ofsy,semicolon,ident..plussy]); lsp:=a.asp; load;
- if not nicescalar(desub(lsp)) then begin error(+0223); lsp:=nil end;
- l0:=newmark; ilbno:=ilbno+1; ilb1:=ilbno;
- nextif(ofsy,+0224); head:=nil; max:=-MI; min:=MI; n:=0;
- repeat ilbno:=ilbno+1; ilb2:=ilbno; {label of current case}
- repeat i:=cstinteger(fsys+[comma,colon1,semicolon],lsp,+0225);
- if i>max then max:=i; if i<min then min:=i; n:=n+1;
- q:=head; r:=nil; new(p);
- while q<>nil do
- begin {chain all cases in ascending order}
- if q^.cslab>=i then
- begin if q^.cslab=i then error(+0226); goto 1 end;
- r:=q; q:=q^.next
- end;
-1: p^.next:=q; p^.cslab:=i; p^.csstart:=ilb2;
- if r=nil then head:=p else r^.next:=p;
- until endofloop(fsys+[colon1,semicolon],[ident..plussy],comma,+0227);
- {+0228}
- nextif(colon1,+0229); newilb(ilb2); statement(fsys+[semicolon]);
- gencst(op_bra,ilb1);
- until lastsemicolon(fsys,[ident..plussy],+0230); {+0231 +0232}
- assert n<>0; newilb(ilb1); l1:=newmark;
- dlb:=newdlb; genop(ps_rom); argnil;
- if (max div 3) - (min div 3) < n then
- begin argcst(min); argcst(max-min);
- m:=op_csa;
- while head<>nil do
- begin
- while head^.cslab>min do
- begin argnil; min:=min+1 end;
- argilb(head^.csstart); min:=min+1; head:=head^.next
- end;
- end
- else
- begin argcst(n); m:=op_csb;
- while head<>nil do
- begin argcst(head^.cslab);argilb(head^.csstart);head:=head^.next end;
- end;
- argend; laedlb(dlb); gencst(m,sz_word); exchange(l0,l1);
- relmark(l0); relmark(l1)
-end end;
-
-procedure repeatstatement(fsys:sos);
-var lb1: integer;
-begin with b do begin
- ilbno:=ilbno+1; lb1:=ilbno; newilb(lb1);
- compoundstatement(fsys+[untilsy],+0233); {+0234}
- nextif(untilsy,+0235); genlin;
- expression(fsys); force(boolptr,+0236); gencst(op_zeq,lb1);
-end end;
-
-procedure whilestatement(fsys:sos);
-var lb1,lb2: integer;
-begin with b do begin
- ilbno:=ilbno+1; lb1:=ilbno; newilb(lb1);
- ilbno:=ilbno+1; lb2:=ilbno;
- genlin; expression(fsys+[dosy]);
- force(boolptr,+0237); gencst(op_zeq,lb2);
- nextif(dosy,+0238); statement(fsys);
- gencst(op_bra,lb1); newilb(lb2)
-end end;
-
-procedure forstatement(fsys:sos);
-var lip:ip; tosym:boolean; endlab,looplab(* ,savlb *):integer;
- av,at1,at2:attr; lsp:sp;
-
-procedure forbound(fsys:sos; var fa:attr; fsp:sp);
-begin
- expression(fsys); fa:=a; force(fsp,+0239);
- if fa.ak<>cst then
- begin temporary(fsp,reg_any);
- genasp(op_dup); fa:=a; store
- end
-end;
-
-begin with b do begin (* savlb:=reglb; *) tosym:=false;
- ilbno:=ilbno+1; looplab:=ilbno; ilbno:=ilbno+1; endlab:=ilbno;
- inita(nil,0);
- if sy<>ident then error(+0240) else
- begin lip:=searchid([vars]); insym;
- a.asp:=lip^.idtype; a.pos:=lip^.vpos;
- lip^.iflag:=lip^.iflag+[used,assigned,loopvar];
- if level>1 then
- if (a.pos.ad>=0) or (a.pos.lv<>level) then
- error(+0241);
- end;
- lsp:=desub(a.asp);
- if not nicescalar(lsp) then begin errasp(+0242); lsp:=nil end;
- av:=a; nextif(becomes,+0243);
- forbound(fsys+[tosy,downtosy,notsy..lparent,dosy],at1,lsp);
- if find1([tosy,downtosy],fsys+[notsy..lparent,dosy],+0244) then
- begin tosym:=sy=tosy; insym end;
- forbound(fsys+[dosy],at2,lsp);
- if tosym then gencst(op_bgt,endlab) else gencst(op_blt,endlab);
- a:=at1; force(av.asp,+0245); a:=av; store; newilb(looplab);
- nextif(dosy,+0246); statement(fsys);
- a:=av; load; a:=at2; load; gencst(op_beq,endlab);
- a:=av; load; if tosym then genop(op_inc) else genop(op_dec);
- a.asp:=lsp; checkbnds(av.asp); a:=av; store;
- gencst(op_bra,looplab); newilb(endlab);
- (* reglb:=savlb *)
-end end;
-
-procedure withstatement(fsys:sos);
-var lnp,savtop:np; (* savlb:integer; *) pbit:boolean;
-begin with b do begin
- (* savlb:=reglb;*) savtop:=top;
- repeat variable(fsys+[comma,dosy]);
- if not formof(a.asp,[records]) then errasp(+0247) else
- begin pbit:=spack in a.asp^.sflag;
- new(lnp,wrec); lnp^.occur:=wrec; lnp^.fname:=a.asp^.fstfld;
- if a.ak<>fixed then
- begin loadaddr; temporary(nilptr,reg_pointer); store;
- a.ak:=pfixed;
- end;
- a.packbit:=pbit; lnp^.wa:=a; lnp^.nlink:=top; top:=lnp;
- end;
- until endofloop(fsys+[dosy],[ident],comma,+0248); {+0249}
- nextif(dosy,+0250); statement(fsys);
- top:=savtop; (* reglb:=savlb; *)
-end end;
-
-procedure assertion(fsys:sos);
-begin teststandard;
- if opt['a']=off then
- while not (sy in fsys) do insym
- else
- begin expression(fsys); force(boolptr,+0251);
- gencst(op_loc,srcorig); gensp(ASS,2*sz_word);
- end
-end;
-
-procedure statement; {fsys: sos}
-var lip:ip; llp:lp; lsy:symbol;
-begin
- assert [labelsy..casesy,endsy] <= fsys;
- assert [ident,intcst] * fsys = [];
- if find2([intcst],fsys+[ident],+0252) then
- begin llp:=searchlab(b.lchain,val);
- if llp=nil then errint(+0253,val) else
- begin if llp^.seen then errint(+0254,val) else llp^.seen:=true;
- newilb(llp^.labname)
- end;
- insym; nextif(colon1,+0255);
- end;
- if find2([ident,beginsy..casesy],fsys,+0256) then
- begin if giveline then if sy<>whilesy then genlin;
- if sy=ident then
- if id='assert ' then
- begin insym; assertion(fsys) end
- else
- begin lip:=searchid([vars,field,func,proc]); insym;
- if lip^.klass=proc then call(fsys,lip) else assignment(fsys,lip)
- end
- else
- begin lsy:=sy; insym;
- case lsy of
- beginsy:
- begin compoundstatement(fsys,+0257); {+0258}
- nextif(endsy,+0259)
- end;
- gotosy:
- gotostatement;
- ifsy:
- ifstatement(fsys);
- casesy:
- begin casestatement(fsys); nextif(endsy,+0260) end;
- whilesy:
- whilestatement(fsys);
- repeatsy:
- repeatstatement(fsys);
- forsy:
- forstatement(fsys);
- withsy:
- withstatement(fsys);
- end
- end;
- end
-end;
-
-{===================================================================}
-
-procedure body(fsys:sos; fip:ip);
-var i,dlb,l0,l1,ssp:integer; llp:lp; spset:boolean;
-begin with b do begin
-{produce PRO}
- genpnam(ps_pro,fip); argend;
- gencst(ps_mes,ms_par);argcst(fip^.maxlb); argend;
- l0:=newmark; dlb:=0; trace('procentr',fip,dlb);
-{global labels}
- llp:=lchain; spset:=false;
- while llp<>nil do
- begin
- if llp^.labdlb<>0 then
- begin
- if not spset then
- begin spset:=true;
- gencst(ps_mes,ms_gto); argend;
- temporary(nilptr,-1); ssp:=a.pos.ad;
- gencst(op_lor,1); store
- end;
- argdlb(llp^.labdlb); lino:=lino+1; genop(ps_rom);
- argilb(llp^.labname); argcst(ssp); argend;
- end;
- llp:=llp^.nextlp
- end;
-{the body itself}
- currproc:=fip;
- compoundstatement(fsys,+0261); {+0262}
- trace('procexit',fip,dlb);
-{undefined labels}
- llp:=lchain;
- while llp<>nil do
- begin if not llp^.seen then errint(+0263,llp^.labval);
- llp:=llp^.nextlp
- end;
-{finish and close files}
- treewalk(top^.fname);
- if level=1 then
- begin l1:=newmark;
- genop(op_fil); argdlb(fildlb); {temporarily}
- dlb:=newdlb; gencst(ps_con,argc+1);
- for i:=0 to argc do with argv[i] do
- begin argcst(ad);
- if (ad=-1) and (i>1) then errid(+0264,name)
- end;
- argend; gencst(op_lxl,0); laedlb(dlb); gencst(op_lae,0);
- gencst(op_lxa,0); gensp(INI,4*sz_addr);
- exchange(l0,l1); relmark(l1); gencst(op_loc,0); gensp(HLT,0)
- end
- else
- begin inita(fip^.idtype,fip^.pfpos.ad);
- if fip^.klass=func then
- begin load;
- if not (assigned in fip^.iflag) then
- errid(-(+0265),fip^.name)
- end;
- genasp(op_ret)
- end;
- relmark(l0);
- gencst(ps_end,-minlb)
-end end;
-
-{===================================================================}
-
-procedure block; {forward declared}
-begin with b do begin
- assert [labelsy..withsy] <= fsys;
- assert [ident,intcst,casesy,endsy,period] * fsys = [];
- if find3(labelsy,fsys,+0266) then labeldeclaration(fsys);
- if find3(constsy,fsys,+0267) then constdefinition(fsys);
- if find3(typesy,fsys,+0268) then typedefinition(fsys);
- if find3(varsy,fsys,+0269) then vardeclaration(fsys);
- if fip=progp then
- begin
- if iop[true]<>nil then
- begin argv[1].ad:=posaddr(holeb,textptr,false);
- iop[true]^.vpos.ad:=argv[1].ad
- end;
- if iop[false]<>nil then
- begin argv[0].ad:=posaddr(holeb,textptr,false);
- iop[false]^.vpos.ad:=argv[0].ad
- end;
- genhol; genpnam(ps_exp,fip);
- end; {externals are also extern for the main body}
- fip^.pfpos.ad:=negaddr(fip^.idtype); {function result area}
- while find2([procsy,funcsy],fsys,+0270) do pfdeclaration(fsys);
- if forwcount<>0 then error(+0271); {forw proc not specified}
- nextif(beginsy,+0272);
- body(fsys+[casesy,endsy],fip);
- nextif(endsy,+0273);
-end end;
-
-{===================================================================}
-
-procedure programme(fsys:sos);
-var stdin,stdout:boolean; p:ip;
-begin
- nextif(progsy,+0274); nextif(ident,+0275);
- if find3(lparent,fsys+[semicolon],+0276) then
- begin
- repeat
- if sy<>ident then error(+0277) else
- begin stdin:=id='input '; stdout:=id='output ';
- if stdin or stdout then
- begin p:=newip(vars,id,textptr,nil);
- enterid(p); iop[stdout]:=p;
- end
- else
- if argc<maxargc then
- begin
- argc:=argc+1; argv[argc].name:=id; argv[argc].ad:=-1
- end;
- insym
- end
- until endofloop(fsys+[rparent,semicolon],[ident],comma,+0278); {+0279}
- if argc>maxargc then
- begin error(+0280); argc:=maxargc end;
- nextif(rparent,+0281);
- end;
- nextif(semicolon,+0282);
- block(fsys,progp);
- if opt['l']<>off then
- begin gencst(ps_mes,ms_src); argcst(srcorig); argend end;
- eofexpected:=true; nextif(period,+0283);
-end;
-
-procedure compile;
-var lsys:sos;
-begin lsys:=[progsy,labelsy..withsy];
- repeat eofexpected:=false;
- main:=find2([progsy,labelsy,beginsy..withsy],lsys,+0284);
- if main then programme(lsys) else
- begin
- if find3(constsy,lsys,+0285) then constdefinition(lsys);
- if find3(typesy,lsys,+0286) then typedefinition(lsys);
- if find3(varsy,lsys,+0287) then vardeclaration(lsys);
- genhol;
- while find2([procsy,funcsy],lsys,+0288) do pfdeclaration(lsys);
- end;
- error(+0289);
- until false; { the only way out is the halt in nextln on eof }
-end;
-
-{===================================================================}
-
-procedure init1;
-var c:char;
-begin
-{reserved words}
- rw[ 0]:='if '; rw[ 1]:='do '; rw[ 2]:='of ';
- rw[ 3]:='to '; rw[ 4]:='in '; rw[ 5]:='or ';
- rw[ 6]:='end '; rw[ 7]:='for '; rw[ 8]:='nil ';
- rw[ 9]:='var '; rw[10]:='div '; rw[11]:='mod ';
- rw[12]:='set '; rw[13]:='and '; rw[14]:='not ';
- rw[15]:='then '; rw[16]:='else '; rw[17]:='with ';
- rw[18]:='case '; rw[19]:='type '; rw[20]:='goto ';
- rw[21]:='file '; rw[22]:='begin '; rw[23]:='until ';
- rw[24]:='while '; rw[25]:='array '; rw[26]:='const ';
- rw[27]:='label '; rw[28]:='repeat '; rw[29]:='record ';
- rw[30]:='downto '; rw[31]:='packed '; rw[32]:='program ';
- rw[33]:='function'; rw[34]:='procedur';
-{corresponding symbols}
- rsy[ 0]:=ifsy; rsy[ 1]:=dosy; rsy[ 2]:=ofsy;
- rsy[ 3]:=tosy; rsy[ 4]:=insy; rsy[ 5]:=orsy;
- rsy[ 6]:=endsy; rsy[ 7]:=forsy; rsy[ 8]:=nilcst;
- rsy[ 9]:=varsy; rsy[10]:=divsy; rsy[11]:=modsy;
- rsy[12]:=setsy; rsy[13]:=andsy; rsy[14]:=notsy;
- rsy[15]:=thensy; rsy[16]:=elsesy; rsy[17]:=withsy;
- rsy[18]:=casesy; rsy[19]:=typesy; rsy[20]:=gotosy;
- rsy[21]:=filesy; rsy[22]:=beginsy; rsy[23]:=untilsy;
- rsy[24]:=whilesy; rsy[25]:=arraysy; rsy[26]:=constsy;
- rsy[27]:=labelsy; rsy[28]:=repeatsy; rsy[29]:=recordsy;
- rsy[30]:=downtosy; rsy[31]:=packedsy; rsy[32]:=progsy;
- rsy[33]:=funcsy; rsy[34]:=procsy;
-{indices into rw to find reserved words fast}
- frw[0]:= 0; frw[1]:= 0; frw[2]:= 6; frw[3]:=15; frw[4]:=22;
- frw[5]:=28; frw[6]:=32; frw[7]:=33; frw[8]:=35;
-{char types}
- for c:=chr(0) to chr(maxcharord) do cs[c]:=others;
- for c:='0' to '9' do cs[c]:=digit;
- for c:='A' to 'Z' do cs[c]:=upper;
- for c:='a' to 'z' do cs[c]:=lower;
- cs[chr(ascnl)]:=layout;
- cs[chr(ascvt)]:=layout;
- cs[chr(ascff)]:=layout;
- cs[chr(asccr)]:=layout;
-{characters with corresponding chartype in ASCII order}
- cs[chr(ascht)]:=tabch;
- cs[' ']:=layout; cs['"']:=dquotech; cs['''']:=quotech;
- cs['(']:=lparentch; cs[')']:=rparentch; cs['*']:=star;
- cs['+']:=plusch; cs[',']:=commach; cs['-']:=minch;
- cs['.']:=periodch; cs['/']:=slash; cs[':']:=colonch;
- cs[';']:=semich; cs['<']:=lessch; cs['=']:=equal;
- cs['>']:=greaterch; cs['[']:=lbrackch; cs[']']:=rbrackch;
- cs['^']:=arrowch; cs['{']:=lbracech;
-{single character symbols in chartype order}
- csy[rparentch]:=rparent; csy[lbrackch]:=lbrack;
- csy[rbrackch]:=rbrack; csy[commach]:=comma;
- csy[semich]:=semicolon; csy[arrowch]:=arrow;
- csy[plusch]:=plussy; csy[minch]:=minsy;
- csy[slash]:=slashsy; csy[star]:=starsy;
- csy[equal]:=eqsy;
-{pascal library mnemonics}
- lmn[ELN ]:='_eln'; lmn[EFL ]:='_efl'; lmn[CLS ]:='_cls';
- lmn[WDW ]:='_wdw';
- lmn[OPN ]:='_opn'; lmn[GETX]:='_get'; lmn[RDI ]:='_rdi';
- lmn[RDC ]:='_rdc'; lmn[RDR ]:='_rdr'; lmn[RDL ]:='_rdl';
- lmn[RLN ]:='_rln';
- lmn[CRE ]:='_cre'; lmn[PUTX]:='_put'; lmn[WRI ]:='_wri';
- lmn[WSI ]:='_wsi'; lmn[WRC ]:='_wrc'; lmn[WSC ]:='_wsc';
- lmn[WRS ]:='_wrs'; lmn[WSS ]:='_wss'; lmn[WRB ]:='_wrb';
- lmn[WSB ]:='_wsb'; lmn[WRR ]:='_wrr'; lmn[WSR ]:='_wsr';
- lmn[WRL ]:='_wrl'; lmn[WSL ]:='_wsl';
- lmn[WRF ]:='_wrf'; lmn[WRZ ]:='_wrz'; lmn[WSZ ]:='_wsz';
- lmn[WLN ]:='_wln'; lmn[PAG ]:='_pag';
- lmn[ABR ]:='_abr'; lmn[RND ]:='_rnd'; lmn[SINX]:='_sin';
- lmn[COSX]:='_cos'; lmn[EXPX]:='_exp'; lmn[SQT ]:='_sqt';
- lmn[LOG ]:='_log'; lmn[ATN ]:='_atn'; lmn[ABI ]:='_abi';
- lmn[ABL ]:='_abl';
- lmn[BCP ]:='_bcp'; lmn[BTS ]:='_bts'; lmn[NEWX]:='_new';
- lmn[SAV ]:='_sav'; lmn[RST ]:='_rst'; lmn[INI ]:='_ini';
- lmn[HLT ]:='_hlt'; lmn[ASS ]:='_ass'; lmn[GTO ]:='_gto';
- lmn[PAC ]:='_pac'; lmn[UNP ]:='_unp'; lmn[DIS ]:='_dis';
- lmn[ASZ ]:='_asz'; lmn[MDI ]:='_mdi'; lmn[MDL ]:='_mdl';
-{scalar variables}
- b.nextbp:=nil;
- b.reglb:=0;
- b.minlb:=0;
- b.ilbno:=0;
- b.forwcount:=0;
- b.lchain:=nil;
- srcchno:=0;
- srclino:=1;
- srcorig:=1;
- lino:=0;
- dlbno:=0;
- holeb:=0;
- argc:=1;
- lastpfno:=0;
- giveline:=true;
- including:=false;
- eofexpected:=false;
- intypedec:=false;
- fltused:=false;
- seconddot:=false;
- iop[false]:=nil;
- iop[true]:=nil;
- argv[0].ad:=-1;
- argv[1].ad:=-1;
-#ifdef NO_EXC
- ohead := nil;
- bcnt := 0;
- mhead := nil;
-#endif NO_EXC
-end;
-
-procedure init2;
-var p:ip; k:idclass; j:standpf;
- pfn:array[standpf] of idarr;
-begin
-{initialize the first name space}
- new(top,blck); top^.occur:=blck; top^.nlink:=nil; top^.fname:=nil;
- level:=0;
-{undefined identifier pointers used by searchid}
- for k:=types to func do
- undefip[k]:=newip(k,spaces,nil,nil);
-{names of standard procedures/functions}
- pfn[pread ]:='read '; pfn[preadln ]:='readln ';
- pfn[pwrite ]:='write '; pfn[pwriteln ]:='writeln ';
- pfn[pput ]:='put '; pfn[pget ]:='get ';
- pfn[ppage ]:='page '; pfn[preset ]:='reset ';
- pfn[prewrite ]:='rewrite '; pfn[pnew ]:='new ';
- pfn[pdispose ]:='dispose '; pfn[ppack ]:='pack ';
- pfn[punpack ]:='unpack '; pfn[pmark ]:='mark ';
- pfn[prelease ]:='release '; pfn[phalt ]:='halt ';
- pfn[feof ]:='eof '; pfn[feoln ]:='eoln ';
- pfn[fabs ]:='abs '; pfn[fsqr ]:='sqr ';
- pfn[ford ]:='ord '; pfn[fchr ]:='chr ';
- pfn[fpred ]:='pred '; pfn[fsucc ]:='succ ';
- pfn[fodd ]:='odd '; pfn[ftrunc ]:='trunc ';
- pfn[fround ]:='round '; pfn[fsin ]:='sin ';
- pfn[fcos ]:='cos '; pfn[fexp ]:='exp ';
- pfn[fsqt ]:='sqrt '; pfn[flog ]:='ln ';
- pfn[fatn ]:='arctan ';
-{standard procedure/function identifiers}
- for j:=pread to phalt do
- begin new(p,proc,standard); p^.klass:=proc;
- p^.name:=pfn[j]; p^.pfkind:=standard; p^.key:=j; enterid(p);
- end;
- for j:=feof to fatn do
- begin new(p,func,standard); p^.klass:=func; p^.idtype:=nil;
- p^.name:=pfn[j]; p^.pfkind:=standard; p^.key:=j; enterid(p);
- end;
-{program identifier}
- progp:=newip(proc,'m_a_i_n ',nil,nil);
-end;
-
-procedure init3;
-var n:np; p,q:ip; i:integer; c:char;
-#if EM_WSIZE == 2
- is:packed array[1..imax] of char;
-#endif
-begin
- for i:=0 to sz_last do readln(errors,sizes[i]);
- if sz_int = 2 then maxintstring := max2bytes
- else maxintstring := max4bytes;
- if sz_long = 2 then maxlongstring := max2bytes
- else maxlongstring := max4bytes;
- gencst(ps_mes,ms_emx); argcst(sz_word); argcst(sz_addr); argend;
- ix:=1;
- while not eoln(errors) do
- begin read(errors,c);
- if ix<smax then begin strbuf[ix]:=c; ix:=ix+1 end
- end;
- readln(errors); strbuf[ix]:=chr(0);
- for i:=1 to fnmax do
- if i<ix then source[i]:=strbuf[i] else source[i]:=' ';
- fildlb:=romstr(sp_scon,0);
-{standard type pointers}
- intptr :=newsp(scalar,sz_int);
- realptr:=newsp(scalar,sz_real);
- longptr:=newsp(scalar,sz_long);
- charptr:=newsp(scalar,sz_char);
- boolptr:=newsp(scalar,sz_bool);
- nilptr :=newsp(pointer,sz_addr);
- zeroptr:=newsp(pointer,sz_addr);
- procptr:=newsp(records,sz_proc);
- nullset:=newsp(power,sz_word); nullset^.elset:=nil;
- textptr:=newsp(files,sz_head+sz_buff); textptr^.filtype:=charptr;
-{standard type names}
- enterid(newip(types,'integer ',intptr,nil));
- enterid(newip(types,'real ',realptr,nil));
- enterid(newip(types,'char ',charptr,nil));
- enterid(newip(types,'boolean ',boolptr,nil));
- enterid(newip(types,'text ',textptr,nil));
-{standard constant names}
- q:=nil; p:=newip(konst,'false ',boolptr,q); enterid(p);
- q:=p; p:=newip(konst,'true ',boolptr,q); p^.value:=1; enterid(p);
- boolptr^.fconst:=p;
-{maxint of the target machine}
- p:=newip(konst,'maxint ',intptr,nil);
- if sz_int = 2 then p^.value:=MI2
- else
-#if EM_WSIZE == 4
- p^.value := MI;
-#else
- {EM_WSIZE = 2, sz_int = 4}
- begin p^.idtype:=longptr; ix:=imax; is:=max4bytes;
- for i:=1 to ix do strbuf[i]:=is[i];
- p^.value:=romstr(sp_icon,sz_int);
- end;
-#endif
- enterid(p);
- p:=newip(konst,spaces,charptr,nil); p^.value:=maxcharord;
- charptr^.fconst:=p;
-{new name space for user externals}
- new(n,blck); n^.occur:=blck; n^.nlink:=top; n^.fname:=nil; top:=n;
-{options}
- for c:='a' to 'z' do begin opt[c]:=0; forceopt[c]:=false end;
- opt['a']:=on;
- opt['i']:=NB1*sz_iset;
- opt['l']:=on;
- opt['o']:=on;
- opt['r']:=on;
- sopt:=off;
-end;
-
-procedure init4;
-begin
- copt:=opt['c'];
- dopt:=opt['d']; if EM_WSIZE < sz_int then dopt:=on;
- iopt:=opt['i'];
- sopt:=opt['s'];
- if sopt<>off then begin copt:=off; dopt:=off end
- else if opt['u']<>off then cs['_']:=lower;
- if copt<>off then enterid(newip(types,'string ',zeroptr,nil));
- if dopt<>off then enterid(newip(types,'long ',longptr,nil));
- if opt['o']=off then begin gencst(ps_mes,ms_opt); argend end;
- if dopt<>off then fltused:=true; {temporary kludge}
-end;
-
-begin {main body of pcompiler}
- init1; {initialize tables and scalars}
- init2; {initialize heap objects}
- rewrite(em); put2(sp_magic); reset(errors);
- init3; {size dependent initialization}
- while not eof(errors) do
- begin options(false); readln(errors) end;
- rewrite(errors);
- if not eof(input) then
- begin nextch; insym;
- init4; {option dependent initialization}
- compile
- end;
-#ifdef STANDARD
-9999: ;
-#endif
-end. {pcompiler}
public / ack.git / commitdiff