/* WARNING: This file is #included into two places, since the definition
of malloc() differs. Be careful. */
static int cond_get_exp (int);
static void handle_cond (int);
#ifndef LEXER
#undef DXALLOC
#define DXALLOC(x, y, z) malloc(x)
#undef FREE
void free(void *);
#define FREE(x) free(x)
#undef ALLOCATE
void *malloc(size_t);
#define ALLOCATE(x, y, z) (x *)malloc(sizeof(x))
#undef DREALLOC
void *realloc(void *, size_t);
#define DREALLOC(w, x, y, z) realloc(w, x)
#endif
static defn_t *defns[DEFHASH];
static ifstate_t *iftop = 0;
static defn_t *lookup_definition (const char * s)
{
defn_t *p;
int h;
h = defhash(s);
for (p = defns[h]; p; p = p->next)
if (strcmp(s, p->name) == 0)
return p;
return 0;
}
defn_t *lookup_define (const char * s)
{
defn_t *p = lookup_definition(s);
if (p && (p->flags & DEF_IS_UNDEFINED))
return 0;
else
return p;
}
static void add_define (const char * name, int nargs, char * exps)
{
defn_t *p = lookup_definition(name);
int h, len;
/* trim off leading and trailing whitespace */
while (uisspace(*exps)) exps++;
for (len = strlen(exps); len && uisspace(exps[len - 1]); len--);
if (*exps == '#' && *(exps + 1) == '#') {
yyerror("'##' at start of macro definition");
return;
}
if (len > 2 && *(exps + len - 2) == '#' && *(exps + len - 1) == '#') {
yyerror("'##' at end of macro definition");
return;
}
if (p) {
if (p->flags & DEF_IS_UNDEFINED) {
p->exps = (char *)DREALLOC(p->exps, len + 1, TAG_COMPILER, "add_define: redef");
memcpy(p->exps, exps, len);
p->exps[len] = 0;
p->flags = 0;
p->nargs = nargs;
} else {
if (p->flags & DEF_IS_PREDEF) {
yyerror("Illegal to redefine predefined value.");
return;
}
if (nargs != p->nargs || strcmp(exps, p->exps)) {
char buf[200 + NSIZE];
sprintf(buf, "redefinition of #define %s\n", name);
yywarn(buf);
p->exps = (char *)DREALLOC(p->exps, len + 1, TAG_COMPILER, "add_define: redef");
memcpy(p->exps, exps, len);
p->exps[len] = 0;
p->nargs = nargs;
}
#ifndef LEXER
p->flags &= ~DEF_IS_NOT_LOCAL;
#endif
}
} else {
p = ALLOCATE(defn_t, TAG_COMPILER, "add_define: def");
p->name = (char *) DXALLOC(strlen(name) + 1, TAG_COMPILER, "add_define: def name");
strcpy(p->name, name);
p->exps = (char *) DXALLOC(len + 1, TAG_COMPILER, "add_define: def exps");
memcpy(p->exps, exps, len);
p->exps[len] = 0;
p->flags = 0;
p->nargs = nargs;
h = defhash(name);
p->next = defns[h];
defns[h] = p;
}
}
#ifdef LEXER
static void handle_elif (char * sp)
#else
static void handle_elif()
#endif
{
if (iftop) {
if (iftop->state == EXPECT_ELSE) {
/* last cond was false... */
int cond;
ifstate_t *p = iftop;
/* pop previous condition */
iftop = p->next;
FREE((char *) p);
#ifdef LEXER
*--outp = '\0';
add_input(sp);
#endif
cond = cond_get_exp(0);
#ifdef LEXER
if (*outp++) {
yyerror("Condition too complex in #elif");
while (*outp++);
#else
if (*outp != '\n') {
yyerror("Condition too complex in #elif");
#endif
} else handle_cond(cond);
} else {/* EXPECT_ENDIF */
/*
* last cond was true...skip to end of
* conditional
*/
skip_to("endif", (char *) 0);
}
} else {
yyerrorp("Unexpected %celif");
}
}
static void handle_else (void) {
if (iftop) {
if (iftop->state == EXPECT_ELSE) {
iftop->state = EXPECT_ENDIF;
} else {
skip_to("endif", (char *) 0);
}
} else {
yyerrorp("Unexpected %cendif");
}
}
static void handle_endif (void) {
if (iftop && (iftop->state == EXPECT_ENDIF ||
iftop->state == EXPECT_ELSE)) {
ifstate_t *p = iftop;
iftop = p->next;
FREE((char *) p);
} else {
yyerrorp("Unexpected %cendif");
}
}
#define BNOT 1
#define LNOT 2
#define UMINUS 3
#define UPLUS 4
#define MULT 1
#define DIV 2
#define MOD 3
#define BPLUS 4
#define BMINUS 5
#define LSHIFT 6
#define RSHIFT 7
#define LESS 8
#define LEQ 9
#define GREAT 10
#define GEQ 11
#define EQ 12
#define NEQ 13
#define BAND 14
#define XOR 15
#define BOR 16
#define LAND 17
#define LOR 18
#define QMARK 19
static char _optab[] =
{0, 4, 0, 0, 0, 26, 56, 0, 0, 0, 18, 14, 0, 10, 0, 22, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 30, 50, 40, 74,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 70, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 63, 0, 1};
static char optab2[] =
{BNOT, 0, 0, LNOT, '=', NEQ, 7, 0, 0, UMINUS, 0, BMINUS, 10, UPLUS, 0, BPLUS, 10,
0, 0, MULT, 11, 0, 0, DIV, 11, 0, 0, MOD, 11,
0, '<', LSHIFT, 9, '=', LEQ, 8, 0, LESS, 8, 0, '>', RSHIFT, 9, '=', GEQ, 8, 0, GREAT, 8,
0, '=', EQ, 7, 0, 0, 0, '&', LAND, 3, 0, BAND, 6, 0, '|', LOR, 2, 0, BOR, 4,
0, 0, XOR, 5, 0, 0, QMARK, 1};
#define optab1 (_optab-' ')
static int cond_get_exp (int priority)
{
int c;
int value, value2, x;
#ifdef LEXER
do
c = exgetc();
while (is_wspace(c));
if (c == '(') {
#else
if ((c = exgetc()) == '(') {
#endif
value = cond_get_exp(0);
#ifdef LEXER
do
c = exgetc();
while (is_wspace(c));
if (c != ')') {
yyerror("bracket not paired in #if");
if (!c) *--outp = '\0';
}
#else
if ((c = exgetc()) != ')') yyerrorp("bracket not paired in %cif");
#endif
} else if (ispunct(c)) {
if (!(x = optab1[c])) {
yyerrorp("illegal character in %cif");
return 0;
}
value = cond_get_exp(12);
switch (optab2[x - 1]) {
case BNOT:
value = ~value;
break;
case LNOT:
value = !value;
break;
case UMINUS:
value = -value;
break;
case UPLUS:
value = value;
break;
default:
yyerrorp("illegal unary operator in %cif");
}
} else {
int base;
if (!isdigit(c)) {
#ifdef LEXER
if (!c) {
#else
if (c == '\n') {
#endif
yyerrorp("missing expression in %cif");
} else
yyerrorp("illegal character in %cif");
return 0;
}
value = 0;
if (c != '0')
base = 10;
else {
c = *outp++;
if (c == 'x' || c == 'X') {
base = 16;
c = *outp++;
} else
base = 8;
}
for (;;) {
if (isdigit(c))
x = -'0';
else if (isupper(c))
x = -'A' + 10;
else if (islower(c))
x = -'a' + 10;
else
break;
x += c;
if (x > base)
break;
value = value * base + x;
c = *outp++;
}
outp--;
}
for (;;) {
#ifdef LEXER
do
c = exgetc();
while (is_wspace(c));
if (!ispunct(c))
break;
#else
if (!ispunct(c = exgetc()))
break;
#endif
if (!(x = optab1[c]))
break;
value2 = *outp++;
for (;; x += 3) {
if (!optab2[x]) {
outp--;
if (!optab2[x + 1]) {
yyerrorp("illegal operator use in %cif");
return 0;
}
break;
}
if (value2 == optab2[x])
break;
}
if (priority >= optab2[x + 2]) {
if (optab2[x]) *--outp = value2;
break;
}
value2 = cond_get_exp(optab2[x + 2]);
switch (optab2[x + 1]) {
case MULT:
value *= value2;
break;
case DIV:
if (value2)
value /= value2;
else
yyerrorp("division by 0 in %cif");
break;
case MOD:
if (value2)
value %= value2;
else
yyerrorp("modulo by 0 in %cif");
break;
case BPLUS:
value += value2;
break;
case BMINUS:
value -= value2;
break;
case LSHIFT:
value <<= value2;
break;
case RSHIFT:
value >>= value2;
break;
case LESS:
value = value < value2;
break;
case LEQ:
value = value <= value2;
break;
case GREAT:
value = value > value2;
break;
case GEQ:
value = value >= value2;
break;
case EQ:
value = value == value2;
break;
case NEQ:
value = value != value2;
break;
case BAND:
value &= value2;
break;
case XOR:
value ^= value2;
break;
case BOR:
value |= value2;
break;
case LAND:
value = value && value2;
break;
case LOR:
value = value || value2;
break;
case QMARK:
#ifdef LEXER
do
c = exgetc();
while (isspace(c));
if (c != ':') {
yyerror("'?' without ':' in #if");
outp--;
return 0;
}
#else
if ((c = exgetc()) != ':') yyerrorp("'?' without ':' in %cif");
#endif
if (value) {
cond_get_exp(1);
value = value2;
} else
value = cond_get_exp(1);
break;
}
}
outp--;
return value;
}
static void
handle_cond (int c)
{
ifstate_t *p;
if (!c)
skip_to("else", "endif");
p = ALLOCATE(ifstate_t, TAG_COMPILER, "handle_cond");
p->next = iftop;
iftop = p;
p->state = c ? EXPECT_ENDIF : EXPECT_ELSE;
}
