mirror of
https://github.com/UberGames/lilium-voyager.git
synced 2024-12-14 14:11:15 +00:00
520 lines
9.6 KiB
C
520 lines
9.6 KiB
C
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include "cpp.h"
|
|
|
|
#define NSTAK 32
|
|
#define SGN 0
|
|
#define UNS 1
|
|
#define UND 2
|
|
|
|
#define UNSMARK 0x1000
|
|
|
|
struct value {
|
|
long val;
|
|
int type;
|
|
};
|
|
|
|
/* conversion types */
|
|
#define RELAT 1
|
|
#define ARITH 2
|
|
#define LOGIC 3
|
|
#define SPCL 4
|
|
#define SHIFT 5
|
|
#define UNARY 6
|
|
|
|
/* operator priority, arity, and conversion type, indexed by tokentype */
|
|
struct pri {
|
|
char pri;
|
|
char arity;
|
|
char ctype;
|
|
} priority[] = {
|
|
{ 0, 0, 0 }, /* END */
|
|
{ 0, 0, 0 }, /* UNCLASS */
|
|
{ 0, 0, 0 }, /* NAME */
|
|
{ 0, 0, 0 }, /* NUMBER */
|
|
{ 0, 0, 0 }, /* STRING */
|
|
{ 0, 0, 0 }, /* CCON */
|
|
{ 0, 0, 0 }, /* NL */
|
|
{ 0, 0, 0 }, /* WS */
|
|
{ 0, 0, 0 }, /* DSHARP */
|
|
{ 11, 2, RELAT }, /* EQ */
|
|
{ 11, 2, RELAT }, /* NEQ */
|
|
{ 12, 2, RELAT }, /* LEQ */
|
|
{ 12, 2, RELAT }, /* GEQ */
|
|
{ 13, 2, SHIFT }, /* LSH */
|
|
{ 13, 2, SHIFT }, /* RSH */
|
|
{ 7, 2, LOGIC }, /* LAND */
|
|
{ 6, 2, LOGIC }, /* LOR */
|
|
{ 0, 0, 0 }, /* PPLUS */
|
|
{ 0, 0, 0 }, /* MMINUS */
|
|
{ 0, 0, 0 }, /* ARROW */
|
|
{ 0, 0, 0 }, /* SBRA */
|
|
{ 0, 0, 0 }, /* SKET */
|
|
{ 3, 0, 0 }, /* LP */
|
|
{ 3, 0, 0 }, /* RP */
|
|
{ 0, 0, 0 }, /* DOT */
|
|
{ 10, 2, ARITH }, /* AND */
|
|
{ 15, 2, ARITH }, /* STAR */
|
|
{ 14, 2, ARITH }, /* PLUS */
|
|
{ 14, 2, ARITH }, /* MINUS */
|
|
{ 16, 1, UNARY }, /* TILDE */
|
|
{ 16, 1, UNARY }, /* NOT */
|
|
{ 15, 2, ARITH }, /* SLASH */
|
|
{ 15, 2, ARITH }, /* PCT */
|
|
{ 12, 2, RELAT }, /* LT */
|
|
{ 12, 2, RELAT }, /* GT */
|
|
{ 9, 2, ARITH }, /* CIRC */
|
|
{ 8, 2, ARITH }, /* OR */
|
|
{ 5, 2, SPCL }, /* QUEST */
|
|
{ 5, 2, SPCL }, /* COLON */
|
|
{ 0, 0, 0 }, /* ASGN */
|
|
{ 4, 2, 0 }, /* COMMA */
|
|
{ 0, 0, 0 }, /* SHARP */
|
|
{ 0, 0, 0 }, /* SEMIC */
|
|
{ 0, 0, 0 }, /* CBRA */
|
|
{ 0, 0, 0 }, /* CKET */
|
|
{ 0, 0, 0 }, /* ASPLUS */
|
|
{ 0, 0, 0 }, /* ASMINUS */
|
|
{ 0, 0, 0 }, /* ASSTAR */
|
|
{ 0, 0, 0 }, /* ASSLASH */
|
|
{ 0, 0, 0 }, /* ASPCT */
|
|
{ 0, 0, 0 }, /* ASCIRC */
|
|
{ 0, 0, 0 }, /* ASLSH */
|
|
{ 0, 0, 0 }, /* ASRSH */
|
|
{ 0, 0, 0 }, /* ASOR */
|
|
{ 0, 0, 0 }, /* ASAND */
|
|
{ 0, 0, 0 }, /* ELLIPS */
|
|
{ 0, 0, 0 }, /* DSHARP1 */
|
|
{ 0, 0, 0 }, /* NAME1 */
|
|
{ 16, 1, UNARY }, /* DEFINED */
|
|
{ 16, 0, UNARY }, /* UMINUS */
|
|
};
|
|
|
|
int evalop(struct pri);
|
|
struct value tokval(Token *);
|
|
struct value vals[NSTAK], *vp;
|
|
enum toktype ops[NSTAK], *op;
|
|
|
|
/*
|
|
* Evaluate an #if #elif #ifdef #ifndef line. trp->tp points to the keyword.
|
|
*/
|
|
long
|
|
eval(Tokenrow *trp, int kw)
|
|
{
|
|
Token *tp;
|
|
Nlist *np;
|
|
int ntok, rand;
|
|
|
|
trp->tp++;
|
|
if (kw==KIFDEF || kw==KIFNDEF) {
|
|
if (trp->lp - trp->bp != 4 || trp->tp->type!=NAME) {
|
|
error(ERROR, "Syntax error in #ifdef/#ifndef");
|
|
return 0;
|
|
}
|
|
np = lookup(trp->tp, 0);
|
|
return (kw==KIFDEF) == (np && np->flag&(ISDEFINED|ISMAC));
|
|
}
|
|
ntok = trp->tp - trp->bp;
|
|
kwdefined->val = KDEFINED; /* activate special meaning of defined */
|
|
expandrow(trp, "<if>");
|
|
kwdefined->val = NAME;
|
|
vp = vals;
|
|
op = ops;
|
|
*op++ = END;
|
|
for (rand=0, tp = trp->bp+ntok; tp < trp->lp; tp++) {
|
|
switch(tp->type) {
|
|
case WS:
|
|
case NL:
|
|
continue;
|
|
|
|
/* nilary */
|
|
case NAME:
|
|
case NAME1:
|
|
case NUMBER:
|
|
case CCON:
|
|
case STRING:
|
|
if (rand)
|
|
goto syntax;
|
|
*vp++ = tokval(tp);
|
|
rand = 1;
|
|
continue;
|
|
|
|
/* unary */
|
|
case DEFINED:
|
|
case TILDE:
|
|
case NOT:
|
|
if (rand)
|
|
goto syntax;
|
|
*op++ = tp->type;
|
|
continue;
|
|
|
|
/* unary-binary */
|
|
case PLUS: case MINUS: case STAR: case AND:
|
|
if (rand==0) {
|
|
if (tp->type==MINUS)
|
|
*op++ = UMINUS;
|
|
if (tp->type==STAR || tp->type==AND) {
|
|
error(ERROR, "Illegal operator * or & in #if/#elsif");
|
|
return 0;
|
|
}
|
|
continue;
|
|
}
|
|
/* flow through */
|
|
|
|
/* plain binary */
|
|
case EQ: case NEQ: case LEQ: case GEQ: case LSH: case RSH:
|
|
case LAND: case LOR: case SLASH: case PCT:
|
|
case LT: case GT: case CIRC: case OR: case QUEST:
|
|
case COLON: case COMMA:
|
|
if (rand==0)
|
|
goto syntax;
|
|
if (evalop(priority[tp->type])!=0)
|
|
return 0;
|
|
*op++ = tp->type;
|
|
rand = 0;
|
|
continue;
|
|
|
|
case LP:
|
|
if (rand)
|
|
goto syntax;
|
|
*op++ = LP;
|
|
continue;
|
|
|
|
case RP:
|
|
if (!rand)
|
|
goto syntax;
|
|
if (evalop(priority[RP])!=0)
|
|
return 0;
|
|
if (op<=ops || op[-1]!=LP) {
|
|
goto syntax;
|
|
}
|
|
op--;
|
|
continue;
|
|
|
|
default:
|
|
error(ERROR,"Bad operator (%t) in #if/#elsif", tp);
|
|
return 0;
|
|
}
|
|
}
|
|
if (rand==0)
|
|
goto syntax;
|
|
if (evalop(priority[END])!=0)
|
|
return 0;
|
|
if (op!=&ops[1] || vp!=&vals[1]) {
|
|
error(ERROR, "Botch in #if/#elsif");
|
|
return 0;
|
|
}
|
|
if (vals[0].type==UND)
|
|
error(ERROR, "Undefined expression value");
|
|
return vals[0].val;
|
|
syntax:
|
|
error(ERROR, "Syntax error in #if/#elsif");
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
evalop(struct pri pri)
|
|
{
|
|
struct value v1, v2;
|
|
long rv1, rv2;
|
|
int rtype, oper;
|
|
|
|
rv2=0;
|
|
rtype=0;
|
|
while (pri.pri < priority[op[-1]].pri) {
|
|
oper = *--op;
|
|
if (priority[oper].arity==2) {
|
|
v2 = *--vp;
|
|
rv2 = v2.val;
|
|
}
|
|
v1 = *--vp;
|
|
rv1 = v1.val;
|
|
/*lint -e574 -e644 */
|
|
switch (priority[oper].ctype) {
|
|
case 0:
|
|
default:
|
|
error(WARNING, "Syntax error in #if/#endif");
|
|
return 1;
|
|
case ARITH:
|
|
case RELAT:
|
|
if (v1.type==UNS || v2.type==UNS)
|
|
rtype = UNS;
|
|
else
|
|
rtype = SGN;
|
|
if (v1.type==UND || v2.type==UND)
|
|
rtype = UND;
|
|
if (priority[oper].ctype==RELAT && rtype==UNS) {
|
|
oper |= UNSMARK;
|
|
rtype = SGN;
|
|
}
|
|
break;
|
|
case SHIFT:
|
|
if (v1.type==UND || v2.type==UND)
|
|
rtype = UND;
|
|
else
|
|
rtype = v1.type;
|
|
if (rtype==UNS)
|
|
oper |= UNSMARK;
|
|
break;
|
|
case UNARY:
|
|
rtype = v1.type;
|
|
break;
|
|
case LOGIC:
|
|
case SPCL:
|
|
break;
|
|
}
|
|
switch (oper) {
|
|
case EQ: case EQ|UNSMARK:
|
|
rv1 = rv1==rv2; break;
|
|
case NEQ: case NEQ|UNSMARK:
|
|
rv1 = rv1!=rv2; break;
|
|
case LEQ:
|
|
rv1 = rv1<=rv2; break;
|
|
case GEQ:
|
|
rv1 = rv1>=rv2; break;
|
|
case LT:
|
|
rv1 = rv1<rv2; break;
|
|
case GT:
|
|
rv1 = rv1>rv2; break;
|
|
case LEQ|UNSMARK:
|
|
rv1 = (unsigned long)rv1<=rv2; break;
|
|
case GEQ|UNSMARK:
|
|
rv1 = (unsigned long)rv1>=rv2; break;
|
|
case LT|UNSMARK:
|
|
rv1 = (unsigned long)rv1<rv2; break;
|
|
case GT|UNSMARK:
|
|
rv1 = (unsigned long)rv1>rv2; break;
|
|
case LSH:
|
|
rv1 <<= rv2; break;
|
|
case LSH|UNSMARK:
|
|
rv1 = (unsigned long)rv1<<rv2; break;
|
|
case RSH:
|
|
rv1 >>= rv2; break;
|
|
case RSH|UNSMARK:
|
|
rv1 = (unsigned long)rv1>>rv2; break;
|
|
case LAND:
|
|
rtype = UND;
|
|
if (v1.type==UND)
|
|
break;
|
|
if (rv1!=0) {
|
|
if (v2.type==UND)
|
|
break;
|
|
rv1 = rv2!=0;
|
|
} else
|
|
rv1 = 0;
|
|
rtype = SGN;
|
|
break;
|
|
case LOR:
|
|
rtype = UND;
|
|
if (v1.type==UND)
|
|
break;
|
|
if (rv1==0) {
|
|
if (v2.type==UND)
|
|
break;
|
|
rv1 = rv2!=0;
|
|
} else
|
|
rv1 = 1;
|
|
rtype = SGN;
|
|
break;
|
|
case AND:
|
|
rv1 &= rv2; break;
|
|
case STAR:
|
|
rv1 *= rv2; break;
|
|
case PLUS:
|
|
rv1 += rv2; break;
|
|
case MINUS:
|
|
rv1 -= rv2; break;
|
|
case UMINUS:
|
|
if (v1.type==UND)
|
|
rtype = UND;
|
|
rv1 = -rv1; break;
|
|
case OR:
|
|
rv1 |= rv2; break;
|
|
case CIRC:
|
|
rv1 ^= rv2; break;
|
|
case TILDE:
|
|
rv1 = ~rv1; break;
|
|
case NOT:
|
|
rv1 = !rv1; if (rtype!=UND) rtype = SGN; break;
|
|
case SLASH:
|
|
if (rv2==0) {
|
|
rtype = UND;
|
|
break;
|
|
}
|
|
if (rtype==UNS)
|
|
rv1 /= (unsigned long)rv2;
|
|
else
|
|
rv1 /= rv2;
|
|
break;
|
|
case PCT:
|
|
if (rv2==0) {
|
|
rtype = UND;
|
|
break;
|
|
}
|
|
if (rtype==UNS)
|
|
rv1 %= (unsigned long)rv2;
|
|
else
|
|
rv1 %= rv2;
|
|
break;
|
|
case COLON:
|
|
if (op[-1] != QUEST)
|
|
error(ERROR, "Bad ?: in #if/endif");
|
|
else {
|
|
op--;
|
|
if ((--vp)->val==0)
|
|
v1 = v2;
|
|
rtype = v1.type;
|
|
rv1 = v1.val;
|
|
}
|
|
break;
|
|
case DEFINED:
|
|
break;
|
|
default:
|
|
error(ERROR, "Eval botch (unknown operator)");
|
|
return 1;
|
|
}
|
|
/*lint +e574 +e644 */
|
|
v1.val = rv1;
|
|
v1.type = rtype;
|
|
*vp++ = v1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
struct value
|
|
tokval(Token *tp)
|
|
{
|
|
struct value v;
|
|
Nlist *np;
|
|
int i, base, c;
|
|
unsigned long n;
|
|
uchar *p;
|
|
|
|
v.type = SGN;
|
|
v.val = 0;
|
|
switch (tp->type) {
|
|
|
|
case NAME:
|
|
v.val = 0;
|
|
break;
|
|
|
|
case NAME1:
|
|
if ((np = lookup(tp, 0)) != NULL && np->flag&(ISDEFINED|ISMAC))
|
|
v.val = 1;
|
|
break;
|
|
|
|
case NUMBER:
|
|
n = 0;
|
|
base = 10;
|
|
p = tp->t;
|
|
c = p[tp->len];
|
|
p[tp->len] = '\0';
|
|
if (*p=='0') {
|
|
base = 8;
|
|
if (p[1]=='x' || p[1]=='X') {
|
|
base = 16;
|
|
p++;
|
|
}
|
|
p++;
|
|
}
|
|
for (;; p++) {
|
|
if ((i = digit(*p)) < 0)
|
|
break;
|
|
if (i>=base)
|
|
error(WARNING,
|
|
"Bad digit in number %t", tp);
|
|
n *= base;
|
|
n += i;
|
|
}
|
|
if (n>=0x80000000 && base!=10)
|
|
v.type = UNS;
|
|
for (; *p; p++) {
|
|
if (*p=='u' || *p=='U')
|
|
v.type = UNS;
|
|
else if (*p=='l' || *p=='L')
|
|
;
|
|
else {
|
|
error(ERROR,
|
|
"Bad number %t in #if/#elsif", tp);
|
|
break;
|
|
}
|
|
}
|
|
v.val = n;
|
|
tp->t[tp->len] = c;
|
|
break;
|
|
|
|
case CCON:
|
|
n = 0;
|
|
p = tp->t;
|
|
if (*p=='L') {
|
|
p += 1;
|
|
error(WARNING, "Wide char constant value undefined");
|
|
}
|
|
p += 1;
|
|
if (*p=='\\') {
|
|
p += 1;
|
|
if ((i = digit(*p))>=0 && i<=7) {
|
|
n = i;
|
|
p += 1;
|
|
if ((i = digit(*p))>=0 && i<=7) {
|
|
p += 1;
|
|
n <<= 3;
|
|
n += i;
|
|
if ((i = digit(*p))>=0 && i<=7) {
|
|
p += 1;
|
|
n <<= 3;
|
|
n += i;
|
|
}
|
|
}
|
|
} else if (*p=='x') {
|
|
p += 1;
|
|
while ((i = digit(*p))>=0 && i<=15) {
|
|
p += 1;
|
|
n <<= 4;
|
|
n += i;
|
|
}
|
|
} else {
|
|
static char cvcon[]
|
|
= "b\bf\fn\nr\rt\tv\v''\"\"??\\\\";
|
|
for (i=0; i<sizeof(cvcon); i+=2) {
|
|
if (*p == cvcon[i]) {
|
|
n = cvcon[i+1];
|
|
break;
|
|
}
|
|
}
|
|
p += 1;
|
|
if (i>=sizeof(cvcon))
|
|
error(WARNING,
|
|
"Undefined escape in character constant");
|
|
}
|
|
} else if (*p=='\'')
|
|
error(ERROR, "Empty character constant");
|
|
else
|
|
n = *p++;
|
|
if (*p!='\'')
|
|
error(WARNING, "Multibyte character constant undefined");
|
|
else if (n>127)
|
|
error(WARNING, "Character constant taken as not signed");
|
|
v.val = n;
|
|
break;
|
|
|
|
case STRING:
|
|
error(ERROR, "String in #if/#elsif");
|
|
break;
|
|
}
|
|
return v;
|
|
}
|
|
|
|
int
|
|
digit(int i)
|
|
{
|
|
if ('0'<=i && i<='9')
|
|
i -= '0';
|
|
else if ('a'<=i && i<='f')
|
|
i -= 'a'-10;
|
|
else if ('A'<=i && i<='F')
|
|
i -= 'A'-10;
|
|
else
|
|
i = -1;
|
|
return i;
|
|
}
|