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compile.c
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/*
* $Id: compile.c,v 1.16 2008/07/15 07:40:25 bnv Exp $
* $Log: compile.c,v $
* Revision 1.16 2008/07/15 07:40:25 bnv
* #include changed from <> to ""
*
* Revision 1.15 2008/07/14 13:08:42 bnv
* MVS,CMS support
*
* Revision 1.14 2006/01/26 10:24:40 bnv
* Added: Indirect exposure to variables
*
* Revision 1.13 2004/08/16 15:28:15 bnv
* Changed: name of mnemonic operands from xxx_mn to O_XXX
*
* Revision 1.12 2004/04/30 15:30:01 bnv
* Fixed: When tracing no clause was appearing after END
*
* Revision 1.11 2004/03/27 08:33:34 bnv
* Corrected: If procedure was following on the next line after the label
*
* Revision 1.10 2003/10/30 13:16:10 bnv
* Variable name change
*
* Revision 1.9 2002/08/22 12:25:41 bnv
* Corrected: copy2tmp added before any call to C_template, to avoid errors like parse var a a b, that b is always null
*
* Revision 1.8 2002/06/11 12:37:38 bnv
* Added: CDECL
*
* Revision 1.7 2001/06/25 18:51:48 bnv
* Header -> Id
*
* Revision 1.6 1999/11/26 13:13:47 bnv
* Changed: To use the new macros
*
* Revision 1.5 1999/05/28 07:20:58 bnv
* ITERATE was jumping to the wrong position inside a "DO UNTIL" loop
*
* Revision 1.5 1999/05/27 10:13:37 bnv
* ITERATE was pointing to a wrong place in a "DO xxx UNTIL" loop
*
* Revision 1.4 1999/05/14 12:31:22 bnv
* Corrected a bug when registering a label_sy
*
* Revision 1.3 1999/03/15 10:08:09 bnv
* Changed: Do not create IdentInfo for non Symbol strings
*
* Revision 1.2 1999/03/10 16:53:32 bnv
* LoopCtrl changed from word to size_t
*
* Revision 1.1 1998/07/02 17:34:50 bnv
* Initial revision
*
*/
#define __COMPILE_C__
#include <setjmp.h>
#include <cmssys.h>
#include "lerror.h"
#include "lstring.h"
#include "bintree.h"
#include "dqueue.h"
#include "rexx.h"
#include "trace.h"
#include "compile.h"
#include "nextsymb.h"
#include "context.h"
/*
//
// Need To DO
// DO NOT ACCEPT LABELS inside DO-END, IF THEN SELECT etc... blocks
// Kill after the interpetation the extra CLAUSES!!!!!
//
*/
/* ---- function prototypes ---- */
int __CDECL C_expr(int);
void __CDECL C_template(void);
TBltFunc *__CDECL C_isBuiltin(PLstr);
typedef struct loop_st {
size_t Citerate;
size_t Cleave;
int noofvars;
PLstr ctrlvar;
} LoopCtrl;
/* ------------ local prototypes ------------ */
static bool C_instr(bool);
static int C_chk4assign(void);
static void C_address(void);
static void C_assign(void);
static void C_arg(void);
static void C_call(void);
static void C_do(void);
static void C_drop(void);
static void C_error(void);
static void C_exit(void);
static void C_if(void);
static void C_interpret(void);
static void C_iterate(void);
static void C_leave(void);
static void C_lower(void);
static void C_options(void);
static void C_nop(void);
static void C_numeric(void);
static void C_parse(void);
static void C_pull(void);
static void C_push(void);
static void C_queue(void);
static void C_return(void);
static void C_say(void);
static void C_select(void);
static void C_signal(void);
static void C_trace(void);
static void C_upper(void);
/* ---------------------------------------------------------- */
/* because ths is const we shall keep it really global */
static const
struct sort_list_st {
char *name;
void (*func)(void);
}
/* WARNING THE LIST MUST BE SORTED!!!!!!!!!!!! */
statements_list[] = {
{"ADDRESS", C_address},
{"ARG", C_arg},
{"CALL", C_call},
{"DO", C_do},
{"DROP", C_drop},
{"ELSE", C_error},
{"EXIT", C_exit},
{"IF", C_if},
{"INTERPRET", C_interpret},
{"ITERATE", C_iterate},
{"LEAVE", C_leave},
{"LOWER", C_lower},
{"NOP", C_nop},
{"NUMERIC", C_numeric},
{"OPTIONS", C_options},
{"OTHERWISE", C_error},
{"PARSE", C_parse},
{"PROCEDURE", C_error},
{"PULL", C_pull},
{"PUSH", C_push},
{"QUEUE", C_queue},
{"RETURN", C_return},
{"SAY", C_say},
{"SELECT", C_select},
{"SIGNAL", C_signal},
{"THEN", C_error},
{"TRACE", C_trace},
{"UPPER", C_upper},
{"WHEN", C_error}
};
/* ---------------- crloopctrl ------------------- */
static LoopCtrl *
crloopctrl(size_t it, size_t le, int vars, PLstr cv) {
LoopCtrl *lc;
Context *context = (Context *) CMSGetPG();
lc = (LoopCtrl *) MALLOC(sizeof(LoopCtrl), "LoopCtrl");
lc->Citerate = it;
lc->Cleave = le;
lc->noofvars = vars;
lc->ctrlvar = cv;
DQPUSH(&(context->compile_Loop), lc);
return lc;
} /* LoopCtrl */
/* ------------- CreateClause ---------------- */
static void
CreateClause(void) {
Context *context = (Context *) CMSGetPG();
/* --- Check if the previous mnemonic was a NEWCLAUSE also --- */
if ((context->compileCompileCurClause) &&
(context->compileCompileClause)[(context->compileCompileCurClause) -
1].code ==
(context->compileCompileCodeLen) - CLAUSESTEP)
return;
/* --- create a clause --- */
(context->compileCompileClause)[(context->compileCompileCurClause)].ptr =
(context->nextsymbsymbolprevptr);
(context->compileCompileClause)[(context->compileCompileCurClause)].line =
(context->nextsymbsymboline);
(context->compileCompileClause)[(context->compileCompileCurClause)].code =
(context->compileCompileCodeLen);
(context->compileCompileClause)[(context->compileCompileCurClause)]
.nesting = (context->compileCompileNesting);
(context->compileCompileClause)[(context->compileCompileCurClause)].fptr =
(context->compileCompileRxFile);
(context->compileCompileCurClause)++;
if ((context->compileCompileCurClause) ==
(context->compileCompileClauseItems)) {
(context->compileCompileClause) = (Clause *) REALLOC(
(context->compileCompileClause),
((context->compileCompileClauseItems) + CLAUSE_INC) *
sizeof(Clause));
(context->compileCompileClauseItems) += CLAUSE_INC;
}
_CodeAddByte(OP_NEWCLAUSE);
} /* CreateClause */
/* --------------- _mustbe -------------------- */
void __CDECL
_mustbe(enum symboltype sym, int errno, int subno) {
Context *context = (Context *) CMSGetPG();
if ((context->nextsymbsymbol) == sym)
nextsymbol();
else
(context->lstring_Lerror)(errno, subno, &(context->nextsymbsymbolstr));
/*
///// This is not correct!!!!!
*/
} /* _mustbe */
#ifndef ALIGN
/* ### If not defined ALIGN ### */
/* --------------- _CodeInsByte --------------- */
word
_CodeInsByte( word pos, byte b )
{
Context *context = (Context*)CMSGetPG();
if ((context->compileCompileCodeLen)+sizeof(b) >= LMAXLEN(*(context->compileCompileCode))) {
Lfx((context->compileCompileCode), (context->compileCompileCodeLen) + CODE_INC);
(context->compileCompileCodePtr) = (byte*)LSTR(*(context->compileCompileCode)) + (context->compileCompileCodeLen);
}
/* shift entire code by one byte */
MEMMOVE(LSTR(*(context->compileCompileCode))+pos+1,
LSTR(*(context->compileCompileCode))+pos,
(context->compileCompileCodeLen)-pos);
LSTR(*(context->compileCompileCode))[pos] = b;
(context->compileCompileCodePtr)++;
return (context->compileCompileCodeLen)++;
} /* _CodeInsByte */
/* --------------- _CodeAddByte --------------- */
word
_CodeAddByte( byte b )
{
Context *context = (Context*)CMSGetPG();
if ((context->compileCompileCodeLen)+sizeof(b) >= LMAXLEN(*(context->compileCompileCode))) {
Lfx((context->compileCompileCode), (context->compileCompileCodeLen) + CODE_INC);
(context->compileCompileCodePtr) = (byte*)LSTR(*(context->compileCompileCode)) + (context->compileCompileCodeLen);
}
*(context->compileCompileCodePtr)++ = b;
return (context->compileCompileCodeLen)++;
} /* _CodeAddByte */
/* --------------- _CodeAddWord --------------- */
word
_CodeAddWord( word w )
{
word pos;
Context *context = (Context*)CMSGetPG();
if ((context->compileCompileCodeLen)+sizeof(w) >= LMAXLEN(*(context->compileCompileCode))) {
Lfx((context->compileCompileCode), (context->compileCompileCodeLen) + CODE_INC);
(context->compileCompileCodePtr) = (byte*)LSTR(*(context->compileCompileCode)) + (context->compileCompileCodeLen);
}
pos = (context->compileCompileCodeLen);
*(word *)(context->compileCompileCodePtr) = w;
(context->compileCompileCodePtr) += sizeof(w);
(context->compileCompileCodeLen) += sizeof(w);
return pos;
} /* _CodeAddWord */
/* ### If defined ALIGN ### */
#else
/* --------------- _CodeInsByte --------------- */
dword
_CodeInsByte(dword pos, dword d) {
Context *context = (Context *) CMSGetPG();
if ((context->compileCompileCodeLen) + sizeof(d) >=
LMAXLEN(*(context->compileCompileCode))) {
Lfx((context->compileCompileCode),
(context->compileCompileCodeLen) + CODE_INC);
(context->compileCompileCodePtr) =
(byte *) LSTR(*(context->compileCompileCode)) +
(context->compileCompileCodeLen);
}
/* shift entire code by one dword */
MEMMOVE(LSTR(*(context->compileCompileCode)) + pos + sizeof(dword),
LSTR(*(context->compileCompileCode)) + pos,
(context->compileCompileCodeLen) - pos);
*(dword *) (LSTR(*(context->compileCompileCode)) + pos) = d;
(context->compileCompileCodePtr) += sizeof(d);
(context->compileCompileCodeLen) += sizeof(d);
return (context->compileCompileCodeLen);
} /* _CodeInsByte */
/* --------------- _CodeAddDWord --------------- */
dword
_CodeAddDWord(dword d) {
dword pos;
Context *context = (Context *) CMSGetPG();
if ((context->compileCompileCodeLen) + sizeof(d) >=
LMAXLEN(*(context->compileCompileCode))) {
Lfx((context->compileCompileCode),
(context->compileCompileCodeLen) + CODE_INC);
(context->compileCompileCodePtr) =
(byte *) LSTR(*(context->compileCompileCode)) +
(context->compileCompileCodeLen);
}
pos = (context->compileCompileCodeLen);
*(dword *) (context->compileCompileCodePtr) = d;
(context->compileCompileCodePtr) += sizeof(d);
(context->compileCompileCodeLen) += sizeof(d);
return pos;
} /* _CodeAddWord */
#endif
/* --------------- _CodeAddPtr ---------------- */
dword
_CodeAddPtr(void *ptr) {
dword pos;
Context *context = (Context *) CMSGetPG();
if ((context->compileCompileCodeLen) + sizeof(ptr) >=
LMAXLEN(*(context->compileCompileCode))) {
Lfx((context->compileCompileCode),
(context->compileCompileCodeLen) + CODE_INC);
(context->compileCompileCodePtr) =
(byte *) LSTR(*(context->compileCompileCode)) +
(context->compileCompileCodeLen);
}
pos = (context->compileCompileCodeLen);
*(dword *) (context->compileCompileCodePtr) = (dword) ptr;
(context->compileCompileCodePtr) += sizeof(ptr);
(context->compileCompileCodeLen) += sizeof(ptr);
return pos;
} /* _CodeAddPtr */
/* -------------- _Add2Lits ----------------- */
void *
_Add2Lits(PLstr lit, int hasdot) {
PBinLeaf leaf;
PLstr tosearch;
Lstr newstr, numstr, aux;
char *ch;
int i, t, cnt, start, stop;
IdentInfo *inf;
Context *context = (Context *) CMSGetPG();
/* Find in tree */
tosearch = lit;
LINITSTR(numstr);
t = _Lisnum(lit);
if (t == LINTEGER_TY) {
Lstrcpy(&numstr, lit);
L2int(&numstr);
if (!Lstrcmp(&numstr, lit)) {
L2int(&numstr);
tosearch = &numstr;
}
} else if (t == LREAL_TY) {
Lstrcpy(&numstr, lit);
L2real(&numstr);
if (!Lstrcmp(&numstr, lit)) {
L2real(&numstr);
tosearch = &numstr;
}
}
leaf = BinFind(&(context->rexxrxLitterals), tosearch);
if (leaf == NULL)
if (tosearch == &numstr)
leaf = BinFind(&(context->rexxrxLitterals), tosearch);
if (leaf == NULL) {
LINITSTR(newstr);
Lfx(&newstr, 1);
Lstrcpy(&newstr, tosearch);
#ifdef USEOPTION
/* set the option for faster recognition */
if (LTYPE(newstr) == LINTEGER_TY)
LSETOPT(newstr,LOPTINT);
else
if (LTYPE(newstr) == LREAL_TY)
LSETOPT(newstr,LOPTREAL);
#endif
if ((LTYPE(newstr) == LSTRING_TY) &&
!LISNULL(newstr) && Ldatatype(&newstr, 'S')) {
LASCIIZ(newstr);
if (hasdot) {
/* count number of dots */
for (cnt = 1, ch = LSTR(newstr); *ch; ch++)
if (*ch == '.')
cnt++;
/* allocate space */
inf = (IdentInfo *) MALLOC
(sizeof(IdentInfo) + (cnt - 1) * sizeof(PBinLeaf),
"ID_INFO_STEM");
/* count substrings and add them to lits */
inf->id = NO_CACHE;
inf->stem = cnt;
/* scan for substrings */
LINITSTR(aux);
_Lsubstr(&aux, &newstr, 1, hasdot);
inf->leaf[0] = _Add2Lits(&aux, FALSE);
stop = hasdot + 1; /* after the dot */
ch = LSTR(newstr) + hasdot;
i = 1;
while (1) {
while (*ch == '.') {
inf->leaf[i++] = NULL;
ch++;
stop++;
}
if (!*ch) {
inf->leaf[i++] = NULL;
break;
}
start = stop; /* find next dot */
while (*ch && *ch != '.') {
ch++;
stop++;
}
_Lsubstr(&aux, &newstr, start, stop - start);
inf->leaf[i++] = _Add2Lits(&aux, FALSE);
if (!*ch) break;
if (*ch == '.') {
ch++;
stop++;
}
}
LFREESTR(aux);
} else {
inf = (IdentInfo *) MALLOC(sizeof(IdentInfo), "ID_INFO");
inf->stem = 0;
inf->leaf[0] = NULL;
}
inf->id = NO_CACHE;
} else
inf = NULL;
leaf = BinAdd(&(context->rexxrxLitterals), &newstr, inf);
}
LFREESTR(numstr);
return leaf;
} /* _Add2Lits */
/* ------------------- _AddLabel ------------------ */
PBinLeaf
_AddLabel(int type, size_t offset) {
PBinLeaf leaf;
Lstr newstr;
RxFunc *func;
TBltFunc *isbuiltin;
Context *context = (Context *) CMSGetPG();
/* --- check to see if we are interpeting a string --- */
if ((context->compile_str_interpreted) && type == FT_LABEL &&
offset != UNKNOWN_LABEL)
(context->lstring_Lerror)(ERR_UNEXPECTED_LABEL, 1,
&(context->nextsymbsymbolstr));
/* --- Find in tree --- */
leaf = BinFind(&(context->rexx_labels), &(context->nextsymbsymbolstr));
if (leaf == NULL) {
LINITSTR(newstr);
Lstrcpy(&newstr, &(context->nextsymbsymbolstr));
func = (RxFunc *) MALLOC(sizeof(RxFunc), "FuncLabel");
func->type = type;
func->builtin = NULL;
func->label = offset;
if ((context->nextsymbsymbolisstr)) {
func->type = FT_SYSTEM;
func->systype = SYST_UNKNOWN;
} else if (type == FT_FUNCTION) {
isbuiltin = C_isBuiltin(&(context->nextsymbsymbolstr));
if (isbuiltin == NULL) {
/* then it might be internal external or system */
func->type = FT_FUNCTION;
func->label = offset;
} else {
func->type = FT_BUILTIN;
func->builtin = isbuiltin;
}
}
leaf = BinAdd(&(context->rexx_labels), &newstr, func);
} else if (offset != UNKNOWN_LABEL) {
func = (RxFunc *) (leaf->value);
if (func->label == UNKNOWN_LABEL) {
/* label found change function type - Internal calls have priority */
if (func->type == FT_BUILTIN || func->type == FT_SYSTEM)
func->type = FT_INTERNAL;
func->label = offset;
}
}
return leaf;
} /* _AddLabel */
/* -------------------------------------------------------------- */
/* C_error, reports an error, when an illegal symbol is found. */
/* -------------------------------------------------------------- */
static void
C_error(void) {
Context *context = (Context *) CMSGetPG();
if (!CMP("ELSE")) (context->lstring_Lerror)(ERR_THEN_UNEXCEPTED, 2);
else if (!CMP("OTHERWISE")) (context->lstring_Lerror)(ERR_WHEN_UNCEPTED, 0);
else if (!CMP("PROCEDURE"))
(context->lstring_Lerror)(ERR_UNEXPECTED_PROC, 0);
else if (!CMP("THEN")) (context->lstring_Lerror)(ERR_THEN_UNEXCEPTED, 1);
else if (!CMP("WHEN")) (context->lstring_Lerror)(ERR_WHEN_UNCEPTED, 0);
else
(context->lstring_Lerror)(ERR_INVALID_EXPRESSION, 0);
} /* C_error */
/* -------------------------------------------------------------- */
/* ADDRESS [<symbol | string> [expr]] ; */
/* redirect commands or a single command to a new */
/* environment. ADDRESS VALUE expr may be used */
/* for an evaluated enviroment name. */
/* -------------------------------------------------------------- */
static void
C_address(void) {
Context *context = (Context *) CMSGetPG();
if ((context->nextsymbsymbol) == semicolon_sy) {
_CodeAddByte(OP_PUSH);
_CodeAddPtr((context->rexxsystemStr));
TraceByte(other_middle);
_CodeAddByte(OP_STOREOPT);
_CodeAddByte(environment_opt);
return;
}
if ((context->nextsymbsymbol) == le_parent || identCMP("VALUE")) {
if ((context->nextsymbsymbol) == ident_sy) nextsymbol();
C_expr(exp_normal);
#ifdef MSDOS
_CodeAddByte(OP_COPY2TMP);
_CodeAddByte(OP_UPPER);
#endif
_CodeAddByte(OP_STOREOPT);
_CodeAddByte(environment_opt);
} else if ((context->nextsymbsymbol) == literal_sy ||
(context->nextsymbsymbol) == ident_sy) {
_CodeAddByte(OP_PUSH);
_CodeAddPtr(SYMBOLADD2LITS_KEY);
TraceByte(other_middle);
#ifdef MSDOS
_CodeAddByte(OP_COPY2TMP);
_CodeAddByte(OP_UPPER);
#endif
nextsymbol();
if ((context->nextsymbsymbol) != semicolon_sy) {
C_expr(exp_normal);
_CodeAddByte(OP_SYSTEM);
} else {
_CodeAddByte(OP_STOREOPT);
_CodeAddByte(environment_opt);
}
} else
(context->lstring_Lerror)(ERR_INVALID_EXPRESSION, 0);
} /* C_address */
/* -------------------------------------------------------------- */
/* ARG <template> ; */
/* parse argument string(s), translated into uppercase, */
/* into variables. Short for PARSE UPPER ARG. */
/* -------------------------------------------------------------- */
static void
C_arg(void) {
int ai;
Context *context = (Context *) CMSGetPG();
ai = 0;
do {
if ((context->nextsymbsymbol) == comma_sy) nextsymbol();
_CodeAddByte(OP_LOADARG);
_CodeAddByte(ai);
_CodeAddByte(OP_COPY2TMP);
_CodeAddByte(OP_UPPER);
C_template();
ai++;
} while ((context->nextsymbsymbol) == comma_sy);
} /* C_arg */
/* -------------------------------------------------------------- */
/* CALL [symbol | string] [<expr>] [,<expr>]... ; */
/* call an internal routine, an external routine or program, */
/* or a built-in function. Depending on the type of */
/* routine called, the variable RESULT contains the result */
/* of the routine. RESULT is uninitialized if no result is */
/* returned. */
/* -------------------------------------------------------------- */
static void
C_call(void) {
int ia, func, line, realarg = 0;
word existarg = 0, bp = 1, lastarg = 0; /* bit mapped, if arguments exist */
void *lbl;
Context *context = (Context *) CMSGetPG();
/* keep line number */
line = (context->nextsymbsymboline);
func = ((context->nextsymbsymbol) == function_sy);
if (((context->nextsymbsymbol) != ident_sy) &&
((context->nextsymbsymbol) != literal_sy) &&
((context->nextsymbsymbol) != function_sy))
(context->lstring_Lerror)(ERR_STRING_EXPECTED, 0);
/* ///////// NOT CORRECT //////////// */
/* Make it work as the SIGNAL ON ... */
if (!CMP("OFF") || (!CMP("ON"))) {
C_signal();
return;
}
/* ///////////////////////////////// */
lbl = _AddLabel(FT_FUNCTION, UNKNOWN_LABEL);
/* since we don't know if it is going to return
a result then we create a stack space */
_CodeAddByte(OP_PUSHTMP);
nextsymbol();
ia = 0;
if (((context->nextsymbsymbol) != semicolon_sy) ||
(func && ((context->nextsymbsymbol) != ri_parent))) {
if ((context->nextsymbsymbol) != comma_sy) {
C_expr(exp_normal);
realarg++;
lastarg = ia + 1;
existarg |= bp; /* argument exist */
}
ia++;
bp <<= 1; /* increase bit position */
while ((context->nextsymbsymbol) == comma_sy) {
nextsymbol();
if (ia >= MAXARGS)
(context->lstring_Lerror)(ERR_INCORRECT_CALL, 0);
if (!(((context->nextsymbsymbol) == comma_sy) ||
((context->nextsymbsymbol) == ri_parent) ||
((context->nextsymbsymbol) == semicolon_sy))) {
C_expr(exp_normal);
realarg++;
lastarg = ia + 1;
existarg |= bp;
}
ia++;
bp <<= 1; /* increase bit position */
}
}
_CodeAddByte(OP_CALL);
_CodeAddPtr(lbl); /* call pointer */
_CodeAddByte(lastarg); /* arguments */
_CodeAddByte(realarg); /* real args */
_CodeAddWord(existarg); /* which exist */
_CodeAddWord(line); /* symbol line */
_CodeAddByte(CT_PROCEDURE); /* call type */
TraceByte(nothing_middle);
if (func)
_mustbe(ri_parent, ERR_UNMATCHED_PARAN, 0);
} /* C_call */
/* -------------------------------------------------------------- */
/* DO [ [name=expri [TO exprt] [BY exprb] */
/* [FOR exprf]] | [ FOREVER | exprr ] */
/* [UNTIL expru | WHILE exprw] ; */
/* [instr]... ; */
/* END [symbol] ; */
/* group instructions together with optional repetition and */
/* condition. NAME is stepped from EXPRI to EXPRT in */
/* steps of EXPRB, for a maximum of EXPRF iterations. */
/* These variables are evaluated only once at the top of */
/* the loop and must result in numbers. The iterative */
/* phrase may be replaced by EXPRR, which is a loop */
/* count (no variable used), or by the keyword */
/* FOREVER. If a WHILE or UNTIL is given, EXPRU or */
/* EXPRW must evaluate to "0" or "1". The condition is */
/* tested at the top of the loop if WHILE or at the bottom */
/* if UNTIL. */
/* -------------------------------------------------------------- */
/* --- DO until END --- */
static void
DOuntilEND(void) {
Context *context = (Context *) CMSGetPG();
while (1) { /* no need for leave & iterate label */
SKIP_SEMICOLONS;
if (C_instr(TRUE)) break;
}
nextsymbol(); /* Skip END */
} /* DOuntilEND */
#define DO_ASSIGN 0x0001
#define DO_TO 0x0002
#define DO_BY 0x0004
#define DO_FOR 0x0008
#define DO_FOREVER 0x0010
#define DO_WHILE 0x0020
#define DO_UNTIL 0x0040
/* --- C_do --- */
static void
C_do(void) {
Context *context = (Context *) CMSGetPG();
/*
* I must define a label for ITERATE and LEAVE in all the cases
* except the case of single loop; DO ... END
*/
enum stat_type old_statement = (context->nextsymbsymbolstat);
LoopCtrl *lc;
PLstr CtrlVar = NULL;
void *cv_ptr = NULL;
size_t body_p, iterate_p, fix_iterate = 0, leave_p, fix_leave = 0;
size_t untilexpr = 0, overuntil, untilend = 0;
size_t pat = 0, tmp;
word idx = 0, idxTO = 0, idxBY = 0, idxFOR = 0;
int dotype = 0;
/* Simplest case */
if ((context->nextsymbsymbol) == semicolon_sy) { /* SINGLE LOOP */
(context->nextsymbsymbolstat) = in_do_st;
DOuntilEND();
(context->nextsymbsymbolstat) = old_statement;
return;
}
(context->nextsymbsymbolstat) = in_do_init_st;
/* --- First check for repetition --- */
/* --- and construct header --- */
if (C_chk4assign()) {
cv_ptr = SYMBOLADD2LITS;
CtrlVar = &(((PBinLeaf) cv_ptr)->key);
C_assign();
dotype |= DO_ASSIGN;
while ((context->nextsymbsymbol) == to_sy ||
(context->nextsymbsymbol) == for_sy ||
(context->nextsymbsymbol) == by_sy)
switch ((context->nextsymbsymbol)) {
case to_sy:
if (idxTO)
(context->lstring_Lerror)(ERR_INVALID_DO_SYNTAX, 0);
idxTO = ++idx;
nextsymbol(); /* Skip TO */
dotype |= DO_TO;
C_expr(exp_tmp);
break;
case by_sy:
if (idxBY)
(context->lstring_Lerror)(ERR_INVALID_DO_SYNTAX, 0);
idxBY = ++idx;
nextsymbol(); /* Skip BY */
dotype |= DO_BY;
C_expr(exp_normal);
_CodeAddByte(OP_BYINIT);
pat = _CodeAddWord(0); /* Patch position */
break;
case for_sy:
if (idxFOR)
(context->lstring_Lerror)(ERR_INVALID_DO_SYNTAX, 0);
idxFOR = ++idx;
nextsymbol(); /* Skip FOR */
dotype |= DO_FOR;
C_expr(exp_normal);
_CodeAddByte(OP_FORINIT);
break;
default:
(context->lstring_Lerror)(ERR_INVALID_DO_SYNTAX, 0);
}
} else /* end of C_chk4assign */
if (identCMP("FOREVER")) {
dotype |= DO_FOREVER;
nextsymbol(); /* Skip FOREVER */
} else
/* --- Check for WHILE/UNTIL --- */
if (identCMP("WHILE")) /* do nothing */;
else if (identCMP("UNTIL")) /* do nothing */;
else { /* ----- REPETITION LOOP ----- */
if (idxFOR)
(context->lstring_Lerror)(ERR_INVALID_DO_SYNTAX, 0);
idxFOR = ++idx;
if (identCMP("FOR")) nextsymbol(); /* skip FOR */
dotype |= DO_FOR;
C_expr(exp_normal);
_CodeAddByte(OP_FORINIT);
}
/* Create a jmp reference at the end and to the iterate pos */
/* jump over leave "jmp" */
_CodeAddByte(OP_JMP);
tmp = _CodeAddWord(0);
leave_p = (context->compileCompileCodeLen);
_CodeAddByte(OP_JMP);
fix_leave = _CodeAddWord(0);
if (dotype & DO_ASSIGN) {
iterate_p = (context->compileCompileCodeLen);
_CodeAddByte(OP_JMP);
fix_iterate = _CodeAddWord(0);
}
CODEFIXUP(tmp, (context->compileCompileCodeLen));
body_p = (context->compileCompileCodeLen);
/* --- Create the main loop control --- */
if (dotype & DO_ASSIGN)
lc = crloopctrl(iterate_p, leave_p, idx, CtrlVar);
else
lc = crloopctrl(body_p, leave_p, idx, CtrlVar);
if ((context->nextsymbsymbol) == while_sy || identCMP("WHILE")) {
dotype |= DO_WHILE;
nextsymbol(); /* Skip WHILE */
C_expr(exp_normal);
_CodeAddByte(OP_JF);
_CodeAddWord(leave_p);
} else if ((context->nextsymbsymbol) == until_sy || identCMP("UNTIL")) {
dotype |= DO_UNTIL;
nextsymbol(); /* Skip UNTIL */
_CodeAddByte(OP_JMP);
overuntil = _CodeAddWord(0);
untilexpr = (context->compileCompileCodeLen);
/* modify to the correct iterate address */
/* to check the UNTIL expr after the iteration */
lc->Citerate = (context->compileCompileCodeLen);
C_expr(exp_normal);
_CodeAddByte(OP_JT);
_CodeAddWord(leave_p);
_CodeAddByte(OP_JMP);
untilend = _CodeAddWord(0);
CODEFIXUP(overuntil, (context->compileCompileCodeLen));
}
/* --- create code for TO,BY,FOR --- */
if (idxTO) {
_CodeAddByte(OP_DUP);
_CodeAddByte(idx - idxTO);
_CodeAddByte(OP_LOAD);
_CodeAddPtr(cv_ptr);
TraceByte(nothing_middle);
if (idxBY) {
CODEFIXUP(pat,
(context->compileCompileCodeLen)); /* Patch reference */
}
_CodeAddByte(OP_TGE); /* This byte will be patched */
TraceByte(nothing_middle);
_CodeAddByte(OP_JF);
_CodeAddWord(leave_p);
}
if (idxFOR) {
_CodeAddByte(OP_DECFOR);
_CodeAddByte(idx - idxFOR); /* variable */
_CodeAddWord(leave_p);
}
/* ===== main body ====== */
_CodeAddByte(OP_NEWCLAUSE);
(context->nextsymbsymbolstat) = in_do_st;
_mustbe(semicolon_sy, ERR_INVALID_DO_SYNTAX, 0);
DOuntilEND();
if (CtrlVar) {
if ((context->nextsymbsymbol) == ident_sy) {
if (!Lstrcmp(&(context->nextsymbsymbolstr), CtrlVar))
nextsymbol();
else
(context->lstring_Lerror)(ERR_UNMATCHED_END, 2,
&(context->nextsymbsymbolstr));
} else if ((context->nextsymbsymbol) != semicolon_sy)
(context->lstring_Lerror)(ERR_SYMBOL_EXPECTED, 1,
&(context->nextsymbsymbolstr));
} else if ((context->nextsymbsymbol) == ident_sy)
(context->lstring_Lerror)(ERR_UNMATCHED_END, 3,
&(context->nextsymbsymbolstr));
/* --- if UNTIL in DO --- */
if (dotype & DO_UNTIL) {
_CodeAddByte(OP_JMP);
_CodeAddWord(untilexpr);
CODEFIXUP(untilend, (context->compileCompileCodeLen));
}
/* --- calc next value --- */
if (dotype & DO_ASSIGN) {
CODEFIXUP(fix_iterate, (context->compileCompileCodeLen));
if (idxBY) {
_CodeAddByte(OP_LOAD);
_CodeAddPtr(cv_ptr);
TraceByte(nothing_middle);
_CodeAddByte(OP_DUP);
_CodeAddByte(0);
_CodeAddByte(OP_DUP);
_CodeAddByte(idx - idxBY + 2);
_CodeAddByte(OP_ADD);
TraceByte(other_middle);
_CodeAddByte(OP_POP);
_CodeAddByte(1);
} else {
_CodeAddByte(OP_LOAD);
_CodeAddPtr(cv_ptr);
TraceByte(nothing_middle);
_CodeAddByte(OP_INC);
TraceByte(other_middle);
}
}
/* --- end of loop, add a jump to the beggining --- */
_CodeAddByte(OP_JMP);
_CodeAddWord(body_p);
CODEFIXUP(fix_leave, (context->compileCompileCodeLen));
lc = DQPop(&(context->compile_Loop)); /* delete loop control */
FREE(lc);
if (dotype & (DO_TO | DO_FOR | DO_BY)) {
_CodeAddByte(OP_POP); /* pop the last value from stack */
_CodeAddByte(idx);
}
(context->nextsymbsymbolstat) = old_statement;
} /* C_do */
/* -------------------------------------------------------------- */
/* DROP name [name]... ; */
/* drop (reset) the named variables or group of variables. */
/* */
/* *** if an exposed variable is named, the variable itself */
/* in the older generation will be dropped! */
/* -------------------------------------------------------------- */
static void
C_drop(void) {
Context *context = (Context *) CMSGetPG();
while (1) {
if ((context->nextsymbsymbol) == ident_sy) {
_CodeAddByte(OP_DROP);
_CodeAddPtr(SYMBOLADD2LITS);
TraceByte(variable_middle);
nextsymbol();
} else if ((context->nextsymbsymbol) == le_parent) {
nextsymbol();
if ((context->nextsymbsymbol) != ident_sy)
(context->lstring_Lerror)(ERR_SYMBOL_EXPECTED, 1,