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c_expr.c
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c_expr.c
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/* c_expr.c
Mike's Enhanced Small C Compiler for Z80 & CP/M
Expression parser module.
Copyright (c) 1999-2016 Miguel I. Garcia Lopez, FloppySoftware.
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:
16 Jan 2001 : Last revision.
16 Apr 2007 : GPL'd.
26 Oct 2015 : Cleaned.
20 Nov 2015 : Updated, function addglb() has changed.
03 Oct 2016 : Added '\e' to ChEsc().
13 Oct 2016 : Documented and optimized a bit. Added LVAL_??? names.
20 Oct 2016 : Added support for __FILE__ and __LINE__.
13 Dec 2017 : Clear lval[LVAL_TYPPTR] in heir11() for [] and function calls.
14 Feb 2018 : Added support for hexadecimal and octal escape sequences in ChEsc().
03 May 2018 : Added support for \' and \" in escape sequences.
Operators precedence:
operator function associativity
--------------- ------------- -------------
! ~ ++ -- - * & heir10 right to left
* / % heir9 left to right
+ - heir8 left to right
<< >> heir7 left to right
< <= > >= heir6 left to right
== != heir5 left to rigth
& heir4 left to rigth
^ heir3 left to right
| heir2 left to right
&& heir1e left to right
|| heir1b left to right
?: heir1a right to left
= -= += *= %= heir1 right to left
/= &= ^= |=
lval[LVAL_SYMADR] is a symbol table address or 0 for constants
lval[LVAL_TYPIND] is a type for indirect objects or 0 for static objects
lval[LVAL_TYPPTR] is a type for a pointer or array or 0
*/
// Local #defines
#define LVAL_DIM 3
#define LVAL_SYMADR 0
#define LVAL_TYPIND 1
#define LVAL_TYPPTR 2
// Parse expression
expresn()
{
int lval[LVAL_DIM];
if(heir1(lval))
rvalue(lval);
}
// Level 1: = += -= *= /= %= &= ^= |=
heir1(lval)
int lval[];
{
int k, lval2[LVAL_DIM];
char op;
k = heir1a(lval);
if(BfNeq('=') && BfNextNeq('='))
return k;
switch(op = Bf())
{
case '=' :
BfGet();
if(k)
{
if(lval[LVAL_TYPIND])
fpush();
if(heir1(lval2))
rvalue(lval2);
break;
}
ndlval();
return 0;
case '+' :
case '-' :
BfGet(); BfGet();
if(!k)
{
ndlval();
return 0;
}
if(lval[LVAL_TYPIND])
fpush();
rvalue(lval);
fpush();
if(heir1(lval2))
rvalue(lval2);
if(dbltest(lval, lval2))
doubreg();
fpop();
if(dbltest(lval2, lval))
{
swap();
doubreg();
swap();
}
if(op == '+')
addfn();
else
{
subfn();
if((lval[LVAL_TYPPTR] & TY_INT) && (lval2[LVAL_TYPPTR] & TY_INT))
{
swap();
immed_dec(1);
a_sr(1);
}
}
// result(lval, lval2);
break;
case '*' :
case '/' :
case '%' :
case '&' :
case '^' :
case '|' :
BfGet(); BfGet();
if(!k)
{
ndlval();
return 0;
}
if(lval[LVAL_TYPIND])
fpush();
rvalue(lval);
fpush();
if(heir1(lval2))
rvalue(lval2);
fpop();
switch(op)
{
case '*' :
a_mul(signtest(lval) && signtest(lval2));
break;
case '/' :
a_div(signtest(lval) && signtest(lval2));
break;
case '%' :
a_mod(signtest(lval) && signtest(lval2));
break;
case '&' : andfn(); break;
case '^' : xorfn(); break;
case '|' : orfn(); break;
}
break;
default :
return k;
}
store(lval);
return 0;
}
// Level 1a: expression ? expression : expression
heir1a(lval)
int lval[];
{
int k, lval2[LVAL_DIM], lab1, lab2;
k=heir1b(lval);
if(InChEq('?'))
{
if(k)
rvalue(lval);
do
{
lab1 = getlabl();
testjmp(lab1);
if(heir1b(lval2))
rvalue(lval2);
lab2 = getlabl();
jump(lab2);
a_lnlabel(lab1);
ndch(':');
if(heir1b(lval2))
rvalue(lval2);
a_lnlabel(lab2);
}
while(InChEq('?'));
k = 0;
}
return k;
}
// Level 1b: ||
heir1b(lval)
int lval[];
{
int k, lval2[LVAL_DIM];
k = heir1e(lval);
if(InWordEq('||'))
{
if(k)
rvalue(lval);
do
{
fpush();
if(heir1e(lval2))
rvalue(lval2);
fpop();
lgorfn();
}
while(InWordEq('||'));
k = 0;
}
return k;
}
// Level 1e: &&
heir1e(lval)
int lval[];
{
int k, lval2[LVAL_DIM];
k = heir2(lval);
if(InWordEq('&&'))
{
if(k)
rvalue(lval);
do
{
fpush();
if(heir2(lval2))
rvalue(lval2);
fpop();
lgandfn();
}
while(InWordEq('&&'));
k = 0;
}
return k;
}
// Level 2: | (or)
heir2(lval)
int lval[];
{
int k, lval2[LVAL_DIM];
k = heir3(lval);
InBlanks();
if(BfNeq('|') || BfNextEq('|') || BfNextEq('='))
return k;
if(k)
rvalue(lval);
while(InChEq('|'))
{
fpush();
if(heir3(lval2))
rvalue(lval2);
fpop();
orfn();
}
return 0;
}
// Level 3: ^ (xor)
heir3(lval)
int lval[];
{
int k, lval2[LVAL_DIM];
k = heir4(lval);
InBlanks();
if(BfNeq('^') || BfNextEq('='))
return k;
if(k)
rvalue(lval);
while(InChEq('^'))
{
fpush();
if(heir4(lval2))
rvalue(lval2);
fpop();
xorfn();
}
return 0;
}
// Level 4: & (and)
heir4(lval)
int lval[];
{
int k, lval2[LVAL_DIM];
k = heir5(lval);
InBlanks();
if(BfNeq('&') || BfNextEq('&') || BfNextEq('='))
return k;
if(k)
rvalue(lval);
while(InChEq('&'))
{
fpush();
if(heir5(lval2))
rvalue(lval2);
fpop();
andfn();
}
return 0;
}
// Level 5: == !=
heir5(lval)
int lval[];
{
int k, lval2[LVAL_DIM];
k = heir6(lval);
InBlanks();
if(BfWordNeq('==') && BfWordNeq('!='))
return k;
if(k)
rvalue(lval);
while(1)
{
if(InWordEq('=='))
k = 0;
else if(InWordEq('!='))
k = 1;
else
return 0;
fpush();
if(heir6(lval2))
rvalue(lval2);
fpop();
k ? ne() : eq();
}
}
// Level 6: < > <= >=
heir6(lval)
int lval[];
{
int k, lval2[LVAL_DIM];
k = heir7(lval);
InBlanks();
if(BfNeq('<') && BfNeq('>') && BfWordNeq('<=') && BfWordNeq('>='))
return k;
if(BfNextEq('<') || BfNextEq('>'))
return k;
if(k)
rvalue(lval);
while(1)
{
if(InWordEq('<='))
k = 0;
else if(InWordEq('>='))
k = 1;
else if(BfEq('<') && BfNextNeq('<'))
k = 2;
else if(BfEq('>') && BfNextNeq('>'))
k = 3;
else
break;
if(k>1)
inbyte();
fpush();
if(heir7(lval2))
rvalue(lval2);
fpop();
if(signtest(lval) && signtest(lval2))
k += 4;
switch(k)
{
case 0 : a_le(0); break;
case 1 : a_ge(0); break;
case 2 : a_lt(0); break;
case 3 : a_gt(0); break;
case 4 : a_le(1); break;
case 5 : a_ge(1); break;
case 6 : a_lt(1); break;
case 7 : a_gt(1); break;
}
}
return 0;
}
// Level 7: >> <<
heir7(lval)
int lval[];
{
int k, lval2[LVAL_DIM];
k = heir8(lval);
InBlanks();
if(BfWordNeq('>>') && BfWordNeq('<<'))
return k;
if(k)
rvalue(lval);
while(1)
{
if(InWordEq('>>'))
k = 0;
else if(InWordEq('<<'))
k = 1;
else
break;
fpush();
if(heir8(lval2))
rvalue(lval2);
fpop();
k ? a_sl(signtest(lval)) : a_sr(signtest(lval));
}
return 0;
}
// Level 8: + - =
heir8(lval)
int lval[];
{
int k, lval2[LVAL_DIM];
k = heir9(lval);
InBlanks();
if((BfNeq('+') && BfNeq('-')) || BfNextEq('='))
return k;
if(k)
rvalue(lval);
while(1)
{
if(InChEq('+'))
k = 0;
else if(InChEq('-'))
k = 1;
else
break;
fpush();
if(heir9(lval2))
rvalue(lval2);
if(dbltest(lval, lval2))
doubreg();
fpop();
if(dbltest(lval2, lval))
{
swap();
doubreg();
swap();
}
if(k)
{
subfn();
if((lval[LVAL_TYPPTR] & TY_INT) && (lval2[LVAL_TYPPTR] & TY_INT))
{
swap();
immed_dec(1);
a_sr(1);
}
}
else
addfn();
if(lval2[LVAL_TYPPTR])
{
if(lval[LVAL_TYPPTR])
lval[LVAL_TYPPTR] = 0;
else
{
lval[LVAL_SYMADR] = lval2[LVAL_SYMADR];
lval[LVAL_TYPIND] = lval2[LVAL_TYPIND];
lval[LVAL_TYPPTR] = lval2[LVAL_TYPPTR];
}
}
else if(signtest(lval))
{
if(!signtest(lval2))
{
lval[LVAL_SYMADR] = lval2[LVAL_SYMADR];
lval[LVAL_TYPIND] = lval2[LVAL_TYPIND];
lval[LVAL_TYPPTR] = lval2[LVAL_TYPPTR];
}
}
}
return 0;
}
// Level 9: * / %
heir9(lval)
int lval[];
{
int k, lval2[LVAL_DIM];
k = heir10(lval);
InBlanks();
if((BfNeq('*') && BfNeq('/') && BfNeq('%')) || BfNextEq('='))
return k;
if(k)
rvalue(lval);
while(1)
{
if(InChEq('*'))
k = 0;
else if(InChEq('/'))
k = 1;
else if(InChEq('%'))
k = 2;
else
break;
fpush();
if(heir10(lval2))
rvalue(lval2);
fpop();
if(signtest(lval))
{
if(signtest(lval2))
k += 3;
else
{
lval[LVAL_SYMADR] = lval2[LVAL_SYMADR];
lval[LVAL_TYPIND] = lval2[LVAL_TYPIND];
lval[LVAL_TYPPTR] = lval2[LVAL_TYPPTR];
}
}
switch(k)
{
case 0 : a_mul(0); break;
case 1 : a_div(0); break;
case 2 : a_mod(0); break;
case 3 : a_mul(1); break;
case 4 : a_div(1); break;
case 5 : a_mod(1); break;
}
}
return 0;
}
// Level 10: ++thing --thing *thing &thing ~thing !thing thing++ thing--
heir10(lval)
int lval[];
{
int k;
char *ptr;
if(InWordEq('++'))
heir10(lval) ? a_incdec(lval, 1, 0) : ndlval();
else if(InWordEq('--'))
heir10(lval) ? a_incdec(lval, 0, 0) : ndlval();
else if(BfEq('-') && !isdigit(BfNext()))
{
BfGet();
if(heir10(lval))
rvalue(lval);
negfn();
}
else if(InChEq('*'))
{
if(heir10(lval))
rvalue(lval);
lval[LVAL_TYPIND] = (ptr = lval[LVAL_SYMADR]) ? ptr[SY_TYPE] : TY_INT;
lval[LVAL_TYPPTR] = 0;
return 1;
}
else if(InChEq('&'))
{
if(heir10(lval))
{
ptr = lval[LVAL_SYMADR];
lval[LVAL_TYPPTR] = ptr[SY_TYPE];
if(!lval[LVAL_TYPIND])
{
if(ptr[SY_STORAGE] == ST_STKLOC)
getloc(ptr);
else
immed_str(ptr);
lval[LVAL_TYPIND] = ptr[SY_TYPE];
}
}
else
errcont(ERILADR);
}
else if(InChEq('~'))
{
if(heir10(lval))
rvalue(lval);
comfn();
}
else if (InChEq('!'))
{
if(heir10(lval))
rvalue(lval);
lgnotfn();
}
else
{
k = heir11(lval);
if(InWordEq('++'))
k ? a_incdec(lval, 1, 1) : ndlval();
else if(InWordEq('--'))
k ? a_incdec(lval, 0, 1) : ndlval();
else
return k;
}
return 0;
}
// Level 11: [], function calls
heir11(lval)
int *lval;
{
int k;
char *ptr;
k = primary(lval);
ptr = lval[LVAL_SYMADR];
InBlanks();
if(BfEq('[') || BfEq('('))
{
while(1)
{
if(InChEq('['))
{
if(!ptr)
{
errcont(ERCTSUB);
junk();
ndch(']');
return 0;
}
else if(ptr[SY_IDENT] == ID_PTR)
rvalue(lval);
else if(ptr[SY_IDENT] != ID_ARR)
{
errcont(ERCTSUB);
k = 0;
}
fpush();
expresn();
ndch(']');
if(ptr[SY_TYPE] & TY_INT)
doubreg();
fpop();
addfn();
lval[LVAL_TYPPTR] = lval[LVAL_SYMADR] = 0;
lval[LVAL_TYPIND] = ptr[SY_TYPE];
k=1;
}
else if(InChEq('('))
{
if(!ptr)
callfnc(0);
else if(ptr[SY_IDENT] != ID_FUN)
{
rvalue(lval);
callfnc(0);
}
else callfnc(ptr);
k = lval[LVAL_TYPPTR] = lval[LVAL_SYMADR] = 0;
}
else
return k;
}
}
if(ptr)
{
if(ptr[SY_IDENT] == ID_FUN)
{
immed_str(ptr);
k = 0;
}
}
return k;
}
// Primary level: parenthesis, symbols, constants
primary(lval)
int *lval;
{
char *ptr, sname[NAME_SIZ];
int num[1], k, szof;
lval[LVAL_TYPPTR] = 0;
// Parenthesis
if(InChEq('('))
{
k = heir1(lval);
ndch(')');
return k;
}
// Symbol name
if(symname(sname))
{
// Local symbol
if(ptr = findloc(sname))
{
lval[LVAL_SYMADR] = ptr;
if(ptr[SY_IDENT] == ID_ARR)
{
getloc(ptr);
lval[LVAL_TYPIND] = lval[LVAL_TYPPTR] = ptr[SY_TYPE];
return 0;
}
lval[LVAL_TYPIND] = 0;
if(ptr[SY_IDENT] == ID_PTR)
lval[LVAL_TYPPTR] = ptr[SY_TYPE];
return 1;
}
// Global symbol
if(ptr = findglb(sname))
{
if(ptr[SY_IDENT] != ID_FUN)
{
lval[LVAL_SYMADR] = ptr;
if(ptr[SY_IDENT] == ID_ARR)
{
immed_str(ptr);
lval[LVAL_TYPIND] = lval[LVAL_TYPPTR] = ptr[SY_TYPE];
return 0;
}
lval[LVAL_TYPIND] = 0;
if(ptr[SY_IDENT] == ID_PTR)
lval[LVAL_TYPPTR] = ptr[SY_TYPE];
return 1;
}
}
else if(!strcmp(sname, "sizeof"))
{
ndch('(');
if(InSymEq("char"))
szof = 1;
else if(InSymEq("int"))
szof = 2;
else
errcont(ERSIZOF);
if(InChEq('*'))
szof = 2;
ndch(')');
immed_dec(szof);
return lval[LVAL_SYMADR] = lval[LVAL_TYPIND] = 0;
}
else if(!strcmp(sname, "__FILE__")) // Yes, I know, this should be check in the CPP...
{
// Write as a constant string
immed(); a_label(litlab); fo_ch('+'); fo_dec(litptr); fo_nl();
ptr = fi_name;
while(*ptr)
{
wrtlit(tolower(*ptr++));
}
wrtlit('\0');
return lval[LVAL_SYMADR] = lval[LVAL_TYPIND] = 0;
}
else if(!strcmp(sname, "__LINE__")) // Yes, I know, this should be check in the CPP...
{
// Write as a constant decimal number
immed(); fo_dec(fi_line); fo_nl();
return lval[LVAL_SYMADR] = lval[LVAL_TYPIND] = 0;
}
else
{
// Undefined symbol, function assumed
ptr = addglb(sname, ID_FUN, TY_INT, 0, 0, 0);
}
// It's a function
lval[LVAL_SYMADR] = ptr;
lval[LVAL_TYPIND] = 0;
return 0;
}
if(cnstant(num))
return lval[LVAL_SYMADR] = lval[LVAL_TYPIND] = 0;
// Error: invalid expression
errcont(ERINVEX);
immed_dec(0);
junk();
return 0;
}
// Check if val1 is int pointer or int array and val2 it's not pointer or array
dbltest(val1, val2)
int val1[], val2[];
{
char *ptr;
if(val1[2] & TY_INT)
{
ptr = val1[0];
if(ptr[SY_IDENT] == ID_PTR || ptr[SY_IDENT] == ID_ARR)
{
if(!val2[2])
return 1;
}
}
return 0;
}
// Check if signed
signtest(lval)
int lval[];
{
char *ptr;
if(lval[LVAL_TYPPTR] || lval[LVAL_TYPIND] == TY_UINT || ((ptr = lval[LVAL_SYMADR]) && ptr[SY_TYPE] == TY_UINT)) // FIXME -- Optimize this ??
return 0;
return 1;
}
// Store value
store(lval)
int *lval;
{
char *ptr;
if(lval[LVAL_TYPIND])
putstk(lval[LVAL_TYPIND]);
else
{
ptr = lval[LVAL_SYMADR];
if(ptr[SY_STORAGE] == ST_STKLOC)
putvloc(ptr);
else
putmem(ptr);
}
}
// Read value
rvalue(lval)
int *lval;
{
char *ptr;
if(lval[LVAL_SYMADR] && !lval[LVAL_TYPIND])
{
ptr = lval[LVAL_SYMADR];
if(ptr[SY_STORAGE] == ST_STKLOC)
getvloc(ptr);
else