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c_parser.c
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/* c_main.c
Mike's Enhanced Small C Compiler for Z80 & CP/M
Parser module.
Copyright (c) 1999-2016 Miguel I. Garcia Lopez
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
Revisions:
11 Oct 2016 : Extracted from c_main.c.
23 Oct 2016 : Modified declvar() in order to set char to signed or unsigned by default (-U option).
*/
// Variable types
// --------------
#define VAR_GLB 0 // Global
#define VAR_LOC 1 // Local
#define VAR_ARG 2 // Function argument
// Parse whole source file
parse()
{
while(!eof)
{
/*************************
while(declvar(VAR_GLB));
newfunc();
InBlanks();
**************************/
if(!declvar(VAR_GLB) && !eof)
newfunc(NULL, TY_INT);
}
}
// Dump string literals
dmplits()
{
int j, k;
if(!litptr)
return;
co_line("Writing strings...");
a_lnlabel(litlab);
k = 0;
while(k < litptr)
{
defbyte();
j = 10; // Number of bytes per line
while(j--)
{
fo_dec(litq[k++]);
if(!j || k >= litptr)
{
fo_nl(); break;
}
fo_ch(',');
}
}
}
// Dump global variables
dmpglbs()
{
char *ptr;
int *pw, size;
co_line("Writing globals...");
for(ptr = GLB_START; ptr != glbptr; ptr += SYMSIZE)
{
if(ptr[SY_IDENT] != ID_FUN && ptr[SY_STORAGE] != ST_EXTERN)
{
fo_str(ptr); fo_colon();
size = *(pw = ptr + SY_OFFSET);
//size=((ptr[SY_OFFSET] & 255) + (ptr[SY_OFFSET+1] << 8));
if(ptr[SY_FLAGS] & FL_VALUE)
{
if(ptr[SY_IDENT] == ID_ARR)
wrtequ();
else if((ptr[SY_TYPE] & TY_CHAR) && ptr[SY_IDENT] != ID_PTR)
defbyte();
else
defword();
if(ptr[SY_FLAGS] & FL_STRBF)
{
a_label(litlab); fo_ch('+');
}
}
else
{
defstrg();
if((ptr[SY_TYPE] & TY_INT) || ptr[SY_IDENT] == ID_PTR)
size += size;
}
fo_dec(size);
fo_nl();
}
}
}
// Declare variables (and functions)
//
// Examples:
//
// char ch;
// unsigned char byte;
// int i;
// unsigned int word;
// unsigned word;
// char space = ' ', letter = 'a';
// char *title = "Title";
// char title[] = "Title";
// char abc[3] = {'a', 'b', 'c'};
// int numbers[] = {1, 2, 3};
//
// extern int total;
// extern char title[];
//
// - Arrays of pointers are not allowed: ie - char *months[] = {"Jan", "Feb", "Mar"};
// - Functions can't be extern or prototyped.
declvar(level)
int level;
{
int stor, sign, type;
int id, dim, flags, arridx, arrmax, arrptr;
char s[NAME_SIZ];
stor = sign = type = 0;
if(level == VAR_GLB)
{
if(InSymEq("extern"))
stor=ST_EXTERN;
}
if(InSymEq("unsigned"))
sign = 1;
else if(InSymEq("signed"))
sign = 2;
if(InSymEq("char"))
type = TY_CHAR;
else if(InSymEq("int"))
type = TY_INT;
if(!(stor + sign + type))
return 0;
if(!type)
type = TY_INT;
if(!stor)
stor = (level == VAR_GLB) ? ST_STATIK : ST_STKLOC;
if(sign == 1)
type = (type == TY_CHAR) ? TY_UCHAR : TY_UINT;
else if(!sign && type == TY_CHAR && uchar)
type = TY_UCHAR;
while(1)
{
id = InChEq('*') ? ID_PTR : ID_VAR;
if(!symname(s))
illname();
dim = flags = 0;
if(InChEq('['))
{
if(number(&dim))
{
if(dim <= 0)
{
errcont(ERARRSZ); dim = 1;
}
}
ndch(']');
if(id == ID_PTR)
errcont(ERARRPT);
if(level == VAR_ARG)
id = ID_PTR;
else if(level == VAR_GLB || stor == ST_EXTERN || dim)
id = ID_ARR;
}
// FIXME -- Look for function declarations
// Look for new functions and assigments
if(/* level == VAR_GLB &&*/ stor == ST_STATIK)
{
// Check if it's a function
if(InChEq('('))
{
newfunc(s, type); return 1;
}
// Assign value if any
if(InChEq('='))
{
flags |= FL_VALUE;
// Check for array or single variable
if(id == ID_ARR)
{
/* Allowed:
Array #1 : int values[] = {1, 2, 3}; -- char or int
Array #2 : int values[3] = {1, 2, 3}; -- char or int
Array #3 : char name[] = "Elvis"; -- char
*/
flags |= FL_STRBF;
if(InChEq('{'))
{
arrmax = dim ? dim : 9999;
arrptr = litptr;
for(arridx = 0; arridx < arrmax; ++arridx)
{
if(constex(&dim))
{
wrtlit(dim);
if(type & TY_INT)
wrtlit(dim >> 8);
}
else
errcont(ERCONST);
if(!InChEq(','))
break;
}
if(arridx < arrmax)
{
if(arrmax == 9999)
arrmax = arridx + 1;
while(++arridx < arrmax)
{
wrtlit(0);
if(type & TY_INT)
wrtlit(0);
}
}
else
errcont(ERARRSZ);
dim = arrptr;
ndch('}');
}
else if(!((type & TY_CHAR) && !dim && qstr(&dim))) // char name[] = "Elvis";
errcont(ERCNTAS);
}
else if(!constex(&dim))
{
// FIXME -- Some bizarre assigns here - ie char c = "String"
if(qstr(&dim))
flags |= FL_STRBF;
else
errcont(ERCNTAS);
}
}
}
// Adjust size
if(!dim)
{
if(!(flags & FL_VALUE))
{
if(id == ID_ARR && stor != ST_EXTERN)
errcont(ERARRSZ);
dim = 1;
}
}
// Declare
if(level == VAR_GLB)
declvglb(s, id, type, stor, dim, flags);
else if(level == VAR_LOC)
declvloc(s, id, type, stor, dim);
else
declvarg(s, id, type, stor, dim);
if(!InChEq(','))
break;
}
ndch(';');
return 1;
}
// Write character to string buffer -- FIXME -- Change qstr(val) in c_expr.c to use this function ??
wrtlit(ch)
int ch;
{
if(litptr < STRBUF_SIZ)
litq[litptr++] = ch;
else
errexit(EROFSTR);
}
// Declare global
declvglb(sym, id, typ, sto, dim, flags)
char *sym;
int id, typ, sto, dim, flags;
{
char *ptr;
if(ptr = findglb(sym))
{
if(id != ptr[SY_IDENT] || typ != ptr[SY_TYPE] || (sto != ST_EXTERN && ptr[SY_STORAGE] != ST_EXTERN))
multidef();
if(sto != ST_EXTERN)
ptr[SY_STORAGE] = sto;
}
else
addglb(sym,id,typ,sto,dim,flags);
}
// Declare local
declvloc(sym, id, typ, sto, dim)
char *sym;
int id, typ, sto, dim;
{
if(findloc(sym))
multidef();
else
{
if(id == ID_PTR || (typ & TY_INT))
dim += dim;
locsiz += dim;
addloc(sym, id, typ, sptr - locsiz);
}
}
// Declare function argument
declvarg(sym, id, typ, sto, dim)
char *sym;
int id, typ, sto, dim;
{
char *ptr;
int *pw, locadr;
if(argstk)
{
if(ptr = findloc(sym))
{
if(ptr[SY_IDENT])
multidef();
else
{
ptr[SY_IDENT] = id;
ptr[SY_TYPE] = typ;
ptr[SY_FLAGS] = 0;
pw = ptr + SY_OFFSET;
locadr = argtop - *pw;
*pw = locadr;
/****************************************************
locadr=argtop-(ptr[SY_OFFSET+1]<<8)-ptr[SY_OFFSET];
ptr[SY_OFFSET]=locadr;
ptr[SY_OFFSET+1]=locadr>>8;
*****************************************************/
argstk -= 2;
}
}
else
errcont(ERARGNM);
}
else
errcont(ERARGNB);
}
// New function
//
// name==NULL -> fun(){...}
// name!=NULL -> ){...}
//
// typ is currently ignored, funcion is always TY_INT
newfunc(name, typ)
char *name;
int typ;
{
char n[NAME_SIZ], *ptr, argtyp;
if(name)
{
strcpy(n, name);
}
else if(!symname(n))
{
errcont(ERFUNDE);
BfKill();
return;
}
else
ndch('(');
msgindent(); co_str("Function: "); co_line(n);
if(ptr = findglb(n))
{
if(ptr[SY_IDENT] != ID_FUN || ptr[SY_OFFSET] == ID_FUN)
multidef();
else
ptr[SY_OFFSET] = ID_FUN;
/***************************************
if(ptr[SY_IDENT]!=ID_FUN)
{
multidef();
}
else
{
if(ptr[SY_OFFSET]==ID_FUN)
multidef();
else
ptr[SY_OFFSET]=ID_FUN;
}
****************************************/
}
else
addglb(n, ID_FUN, TY_INT, ST_STATIK, ID_FUN, 0);
fo_line(n); // FIXME -- Use a function from c_asm.c ??
locptr = LOC_START;
argstk = 0;
while(!InChEq(')'))
{
if(symname(n))
{
if(findloc(n))
multidef();
else
{
addloc(n, 0, 0, argstk);
argstk += 2;
}
}
else
{
errcont(ERARGNM);
junk();
}
InBlanks();
if(BfNeq(')'))
ndch(',');
if(endst())
break;
}
if(argstk)
{
argtop = argstk;
while(declvar(VAR_ARG))
;
if(argstk)
errcont(ERARGNB);
}
sptr = lastst = 0;
if(stment() != S_RETURN)
{
modstk(0, 0);
retfn();
}
sptr = 0;
locptr = LOC_START;
}
// Statement
// ---------
stment()
{
if(eof)
return -1;
if(InSymEq("if"))
{
doif(); lastst = S_IF;
}
else if(InSymEq("for"))
{
dofor(); lastst = S_FOR;
}
else if(InSymEq("while"))
{
dowhile(); lastst = S_WHILE;
}
else if(InSymEq("break"))
{
dobreak(); ns(); lastst = S_BREAK;
}
else if(InSymEq("do"))
{
dodo(); lastst = S_WHILE;
}
else if(InSymEq("return"))
{
doretrn(); ns(); lastst = S_RETURN;
}
else if(InSymEq("continue"))
{
docont(); ns(); lastst = S_CONT;
}
else if(InSymEq("switch"))
{
doswtch(); lastst = S_SWITCH;
}
else if(InChEq('{'))
{
while(!InChEq('}'))
{
if(stment() == -1)
{
errndch('}'); break;
}
}
}
else if(InChEq(';'))
{
// Nothing
}
else
{
locsiz = 0;
while(declvar(VAR_LOC));
if(locsiz)
sptr = modstk(sptr - locsiz, 0);
else
{
expresn(); ns(); lastst = S_EXP;
}
}
return lastst;
}
// Need end of statement
ns()
{
ndch(';');
}
// if statement
doif()
{
int flev, fsp, flab1, flab2;
flev = locptr;
fsp = sptr;
flab1 = getlabl();
test(flab1);
stment();
sptr = modstk(fsp, 0);
locptr = flev;
if(!InSymEq("else"))
{
a_lnlabel(flab1); return;
}
if(lastst != S_RETURN && lastst != S_BREAK && lastst != S_CONT)
jump(flab2 = getlabl());
else
flab2 = 0;
a_lnlabel(flab1);
stment();
sptr = modstk(fsp, 0);
locptr = flev;
if(flab2)
a_lnlabel(flab2);
}
// do statement
dodo()
{
int wq[WQ_SIZ];
wq[WQ_SYM] = locptr;
wq[WQ_SP] = sptr;
wq[WQ_LOOP] = getlabl();
wq[WQ_LAB] = getlabl();
wq[WQ_LAB2] = getlabl();
addwhle(wq);
a_lnlabel(wq[WQ_LAB2]);
stment();
if(!InSymEq("while"))
errcont(EREXWHI);
a_lnlabel(wq[WQ_LOOP]);
test(wq[WQ_LAB]);
jump(wq[WQ_LAB2]);
a_lnlabel(wq[WQ_LAB]);
ns();
locptr = wq[WQ_SYM];
sptr = modstk(wq[WQ_SP], 0);
delwhle();
}
// while statement
dowhile()
{
int wq[WQ_SIZ];
wq[WQ_SYM] = locptr;
wq[WQ_SP] = sptr;
wq[WQ_LOOP] = getlabl();
wq[WQ_LAB] = getlabl();
addwhle(wq);
a_lnlabel(wq[WQ_LOOP]);
test(wq[WQ_LAB]);
stment();
jump(wq[WQ_LOOP]);
a_lnlabel(wq[WQ_LAB]);
locptr = wq[WQ_SYM];
sptr = modstk(wq[WQ_SP], 0);
delwhle();
}
// return statement
doretrn()
{
if(endst())
modstk(0, 0);
else
{
expresn();
modstk(0, 1);
}
retfn();
}
// break statement
dobreak()
{
int *ptr;
if((ptr = rdwhile()))
{
modstk(ptr[WQ_SP], 0);
jump(ptr[WQ_LAB]);
}
}
// continue statement
docont()
{
int *ptr;
if((ptr = rdwhile()))
{
modstk(ptr[WQ_SP], 0);
jump(ptr[WQ_LOOP]);
}
}
// Call function
callfnc(ptr)
char *ptr;
{
int nargs;
nargs = 0;
InBlanks();
if(!ptr)
fpush();
while(BfNeq(')'))
{
if(endst())
break;
expresn();
if(!ptr)
swapstk();
fpush();
nargs += 2;
if(!InChEq(','))
break;
}
ndch(')');
// Add # of arguments if it's a special function (printf, scanf, etc.)
if(ptr)
{
if(special(ptr))
{
immed_dec(nargs / 2);
nargs += 2;
fpush();
}
callfn(ptr);
}
else
callstk();
sptr = modstk(sptr + nargs, 1);
}
// Check for special function names
special(ptr)
char *ptr;
{
if(!strcmp(ptr,"printf"))
return 1;
if(!strcmp(ptr,"scanf"))
return 1;
if(!strcmp(ptr,"sprintf"))
return 1;
if(!strcmp(ptr,"sscanf"))
return 1;
if(!strcmp(ptr,"fprintf"))
return 1;
if(!strcmp(ptr,"fscanf"))
return 1;
return 0;
}
// Junk
junk()
{
if(issym(inbyte()))
{
while(issym(Bf()))
BfGet();
}
else
{
while((!issym(Bf())) && Bf())
BfGet();
}
InBlanks();
}
// Check for end of statement
endst()
{
InBlanks();
return(BfEq(';') || BfEq(0));
}
// Illegal symbol name
illname()
{
errcont(ERSYMNM);
junk();
}
// Symbol already defined
multidef()
{
errcont(ERALDEF);
}
// Find global symbol
findglb(s)
char *s;
{
char *ptr;
for(ptr = GLB_START; ptr != glbptr; ptr += SYMSIZE)
{
if(!strcmp(s, ptr))
return ptr;
}
return 0;
}
// Find local symbol
findloc(s)
char *s;
{
char *ptr;
for(ptr = LOC_START; ptr != locptr; ptr += SYMSIZE)
{
if(!strcmp(s, ptr))
return ptr;
}
return 0;
}
// Add global symbol
addglb(s, id, typ, sto, val, flags)
char *s, id, typ, sto;
int val, flags;
{
char *ptr;
int *pw;
if(ptr = findglb(s))
return ptr;
if(glbptr == GLB_END)
errexit(EROFGLB);
ptr = glbptr;
strcpy(ptr, s);
ptr[SY_IDENT] = id;
ptr[SY_TYPE] = typ;
ptr[SY_STORAGE] = sto;
ptr[SY_FLAGS] = flags;
*(pw = ptr + SY_OFFSET) = val;
//ptr[SY_OFFSET]=val;
//ptr[SY_OFFSET+1]=val>>8;
glbptr += SYMSIZE;
return ptr;
}
// Add local symbol
addloc(s, id, typ, val)
char *s, id, typ;
int val;
{
char *ptr;
int *pw;
if(ptr = findloc(s))
return ptr;
if(locptr == LOC_END)
errexit(EROFLOC);
ptr = locptr;
strcpy(ptr, s);
ptr[SY_IDENT] = id;
ptr[SY_TYPE] = typ;
ptr[SY_STORAGE] = ST_STKLOC;
ptr[SY_FLAGS] = 0;
*(pw = ptr + SY_OFFSET) = val;
//ptr[SY_OFFSET]=val;
//ptr[SY_OFFSET+1]=val>>8;
locptr += SYMSIZE;
return ptr;
}
// Check if string starts with a valid symbol name
symname(s)
char *s;
{
int i;
InBlanks();
if(issym1st(Bf()))
{
i = 0;
do
{
if(i != NAME_MAX)
{
*s++ = BfGet();
++i;
}
else
BfGet();
}
while(issym(Bf()));
*s = 0;
return 1;
}
return 0;
}
// Get next label number
getlabl()
{
return nxtlab++;