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cpp.c
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cpp.c
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/***************************************************************************
C preprocessor
The preprocessor is not a seperate stage but an extension to the lexical
analyser. This is possible and efficient since we avoid two passes of
the source file.
***************************************************************************/
#include "global.h"
#include "SYS.h"
#ifdef DO_CPP
//
// these are borrowed from lex.c
//
extern int skip_ws ();
extern int skip_comment ();
extern int skip_line ();
extern int enter_symbol (char*);
extern int enter_string (char*);
extern int do_yylex ();
static void skip_pp_line ()
{
// Skip a line but respect that newlines inside:
// strings, comments, char consts and
// escaped ones don't count
for (;;) {
if (Ci >= Clen) return;
switch (Cpp [Ci]) {
case '/':
++Ci;
if (Cpp [Ci] == '*') skip_comment ();
else if (Cpp [Ci] == '/') skip_line ();
ncase '\\':
if (Cpp [++Ci] == '\n') {
++Ci;
++line;
}
ncase '\n': return;
ncase '"':
for (++Ci; Ci < Clen && Cpp [Ci] != '"'; Ci++)
if (Cpp [Ci] == '\\') ++Ci;
else if (Cpp [Ci] == '\n') ++line;
++Ci;
ncase '\'':
for (++Ci; Ci < Clen && Cpp [Ci] != '\''; Ci++)
if (Cpp [Ci] == '\\') ++Ci;
else if (Cpp [Ci] == '\n') ++line;
++Ci;
ndefault:
++Ci;
}
}
}
static Token *get_expanded_line ()
{
Token t;
SAVE_VAR (Ci, Ci);
skip_pp_line ();
SAVE_VAR (Clen, Ci+1);
RESTOR_VAR (Ci);
OUTSTREAM S = new_stream ();
while ((t = do_yylex ()) != THE_END)
if (ISSYMBOL (t))
if (t == RESERVED_defined) {
if (!issymbol (t = do_yylex ())
&& (t != '(' || !issymbol (t = do_yylex ())
|| do_yylex () != ')'))
parse_error_cpp ("defined (symbol)");
output_itoken (S, is_macro (t) == -1 ? RESERVED_0 : RESERVED_1);
} else if (is_macro (t) != -1) {
Token *E = expand_macro (t);
outprintf (S, ISTR (E), -1);
free (E);
} else goto jmp;
else jmp: output_itoken (S, t);
RESTOR_VAR (Clen);
return combine_output (S);
}
/******************************************************************************
File inclusion
Search for the file in the usual places and then recurse back to yydo_file.
If the directive is "#uses", then enclose everything inside extern "file" {}
******************************************************************************/
static char **hsearch, **isearch;
static char *fixpath (char *path)
{
char *p = path, *s, *e;
while (*p)
if (p [0] == '.')
if (p [1] == '/') {
s = p; e = p + 2;
while (*s++ = *e++);
} else if (p [1] == '.' && p [2] == '/' && p > path + 1 && p [-1] == '/') {
e = p + 3;
for (s = p - 2; *s != '/' && s > path; s--);
p = *s == '/' ? ++s : s;
while (*s++ = *e++);
} else goto eelse;
else eelse: ++p;
return path;
}
static char *FindHeader (char *fn, char *ret, bool sys)
{
char **p = sys ? isearch : hsearch;
char tmp [256];
for (; *p; p++) {
tmp [0] = 0;
if (!sys && (**p != '/' || *p [1] != ':' && *p [2] != '/')
&& strchr (current_file, '/')) {
strcpy (tmp, current_file);
char *t = strrchr (tmp, '/');
if (t) *(t + 1) = 0;
else tmp [0] = 0;
}
strcat (tmp, *p);
if (strlen (tmp) && tmp [strlen (tmp) - 1] != '/') strcat (tmp, "/");
strcat (tmp, fn);
fixpath (tmp);
if (access (tmp, R_OK) == 0)
return strcpy (ret, tmp);
}
fprintf (stderr, "Could not find file %s\n", fn);
fatal ("terminated");
return 0;
}
static intnode *included;
static void include (bool uses)
{
int closer, i, t;
char fn [128], path [256];
skip_ws ();
closer = Cpp [Ci] == '<' ? '>' : Cpp [Ci] == '"' ? '"' : 0;
if (!closer) fatal ("#include");
for (++Ci, i = 0; Cpp [Ci] != closer && Ci < Clen && i < sizeof fn;)
fn [i++] = Cpp [Ci++];
fn [i] = 0;
if (Cpp [Ci++] != closer) fatal ("#include");
FindHeader (fn, path, closer == '>');
t = enter_value (path);
if (!intfind (included, t)) {
union ival u;
intadd (&included, t, u);
if (uses) {
char path [256];
sprintf (path, "\"%s\"", fn);
outprintf (GLOBAL, RESERVED_extern, enter_value (path), '{', -1);
}
if (yydo_file (path) == -1) {
fprintf (stderr, "Problematic file [%s]\n", fn);
fatal ("Can't open file");;
}
if (uses) output_itoken (GLOBAL, '}');
}
}
/******************************************************************************
Macro Definitions && undefs
******************************************************************************/
typedef struct {
int argc;
Token *body;
} macro;
static intnode *macrotree;
int is_macro (Token t)
{
intnode *n;
if (n = intfind (macrotree, t))
return ((macro*) n->v.p)->argc;
return ISPREDEF (t) ? 0 : -1;
}
static void define ()
{
int argc = 0, i, margc = 0;
Token n = do_yylex (), argv [100], t;
macro *m;
intnode *mn;
if (!ISSYMBOL (n)) fatal ("#define");
#ifdef DEBUG
if (debugflag.CPP) {
PRINTF ("define ["COLS"%s"COLE"]\n", expand (n));
}
#endif
if (Cpp [Ci] == '(') {
for (++Ci;;) {
t = do_yylex ();
if (t == ')') break;
if (t == ELLIPSIS) {
if (do_yylex () != ')')
parse_error_cpp ("#define X(arg,...) : C99 style");
break;
}
if (!ISSYMBOL (t)) fatal ("#define args");
argv [argc++] = t;
t = do_yylex ();
if (t == ')') break;
if (t == ELLIPSIS) fatal ("gnu varags not supported");
if (t != ',') fatal ("#define args separator");
}
margc = t == ELLIPSIS ? argc + VARBOOST : argc ?: VOIDARG;
}
SAVE_VAR (Ci, Ci);
skip_pp_line ();
SAVE_VAR (Clen, Ci+1);
RESTOR_VAR (Ci);
OUTSTREAM Def = new_stream ();
while ((t = do_yylex ()) != THE_END) {
for (i = 0; i < argc; i++)
if (argv [i] == t) {
t = i + ARGBASE;
break;
}
if (t == RESERVED___VA_ARGS__)
t = argc + ARGBASE;
output_itoken (Def, t);
}
m = (macro*) malloc (sizeof *m);
m->body = combine_output (Def);
m->argc = margc;
if (mn = intfind (macrotree, n)) {
macro *h = (macro*) mn->v.p;
if (h->argc != m->argc || intcmp (h->body, m->body))
fatal ("different macro redefinition");
free (m->body);
free (m);
} else {
union ival u = { .p m };
intadd (¯otree, n, u);
}
RESTOR_VAR (Clen);
}
void undef ()
{
Token m = do_yylex ();
intnode *n = intfind (macrotree, m);
if (n) {
free (((macro*) n->v.p)->body);
intremove (¯otree, n);
free (n);
}
}
/******************************************************************************
cpp expression evaluation (#if, #elif)
a mini-compiler inside the compiler...
right now works only with integers. floats and other stuff
evaluate to 1L. symbols evaluate to 0L
******************************************************************************/
static Token *eval_expr;
static NormPtr eep;
static long long int cpp_expression ();
static long long int cpp_cond_getnum ()
{
Token s = eval_expr [eep++];
switch (s) {
case '!': return !cpp_cond_getnum ();
case '(': return cpp_expression ();
case '-': return -cpp_cond_getnum ();
case '~': return ~cpp_cond_getnum ();
}
if (ISVALUE (s))
return type_of_const (s) == typeID_int ?
eval_intll (s) : 1;
return 0;
}
static int op_pri (int type)
{
/* oh not again */
switch (type) {
case -1:
case ')': return 9;
case ANDAND:
case OROR: return 8;
case '|': return 7;
case '^': return 6;
case '&': return 5;
case NEQCMP:
case EQCMP: return 4;
case '<':
case '>':
case GEQCMP:
case LEQCMP: return 3;
case RSH:
case LSH: return 2;
case '+':
case '-': return 1;
case '*':
case '/':
case '%': return 0;
default: return -1;
}
}
#define CALC(operator) \
/* PRINTF ("calculating %lli %s %lli\n", Arr [ce-1], #operator, Arr[ce+1]); */\
Arr [ce - 1] = Arr [ce - 1] operator Arr [ce + 1];\
break;
static long long int cpp_expressionr ()
{
long long int Arr [64];
int pri, ce;
Arr [0] = 1;
/* DO NOT TRY THIS AT HOME */
for (;;) {
Arr [Arr [0]] = cpp_cond_getnum ();
pri = op_pri (eval_expr [eep]);
if (pri == -1)
if (eval_expr [eep] == '?' || eval_expr [eep] == ':')
return Arr [1];
else parse_error_cpp ("confusing expression in #if");
while (Arr [0] > 1)
if (op_pri (Arr [ce = Arr [0] - 1]) <= pri) {
switch (Arr [ce]) {
case '*': CALC (*);
case '/': CALC (/);
case '%': CALC (%);
case '+': CALC (+);
case '-': CALC (-);
case RSH: CALC (>>);
case LSH: CALC (<<);
case '<': CALC (<);
case '>': CALC (>);
case EQCMP: CALC (==);
case NEQCMP: CALC (!=);
case GEQCMP: CALC (>=);
case LEQCMP: CALC (<=);
case '&': CALC (&);
case '|': CALC (|);
case '^': CALC (^);
case ANDAND: CALC (&&);
}
Arr [0] -= 2;
} else break;
if (pri == 9) return Arr [1];
if (pri == 8) {
if (eval_expr [eep] == ANDAND && Arr [1] == 0) {
for (++eep; eval_expr [eep] != ')' && eval_expr [eep] != OROR
&& eval_expr [eep] != -1; eep++)
if (eep == '(')
eep = skip_buffer_parenthesis (eval_expr, eep + 1) - 1;
if (eval_expr [eep] != OROR) return 0;
++eep;
Arr [0] = 1;
continue;
}
if (eval_expr [eep] == OROR && Arr [1] != 0) {
for (++eep; eval_expr [eep] != ')' && eval_expr [eep] != -1; eep++)
if (eep == '(')
eep = skip_buffer_parenthesis (eval_expr, eep + 1) - 1;
return 1;
}
}
Arr [++Arr [0]] = eval_expr [eep++];
++Arr [0];
}
}
static long long int cpp_expression ()
{
static bool expectcond;
long long int rez = cpp_expressionr ();
switch (eval_expr [eep]) {
case ')': ++eep; break;
case '?': {
++eep;
SAVE_VAR (expectcond, true);
long long int r1 = cpp_expression ();
RESTOR_VAR (expectcond);
rez = rez ? r1 : cpp_expression ();
} break;
case ':': if (expectcond) ++eep;
else parse_error_cpp ("':' without '?'");
ndefault: if (expectcond) parse_error_cpp ("missing ':'");
}
return rez;
}
static bool cpp_condition ()
{
bool r;
eval_expr = get_expanded_line ();
#ifdef DEBUG
if (debugflag.CPP) {
PRINTF ("Conditional expression :");
INTPRINT (eval_expr);
PRINTF ("\n");
}
#endif
eep = 0;
r = cpp_expression () != 0;
free (eval_expr);
return r;
}
/******************************************************************************
Conditional compilation
don't try this at home....
******************************************************************************/
static int conditional_pp;
static void skip_to_endif (bool checkelse)
{
Token t;
for (;;) {
t = do_yylex ();
if (t != CPP_DIRECTIVE) {
skip_pp_line ();
if (Ci >= Clen)
parse_error_cpp ("#if without endif");
continue;
}
t = do_yylex ();
if (t == RESERVED_endif) break;
if (t == RESERVED_if || t == RESERVED_ifdef || t == RESERVED_ifndef) {
skip_to_endif (false);
continue;
}
if (!checkelse) continue;
if (t == RESERVED_else) {
skip_pp_line ();
++conditional_pp;
return;
}
if (t == RESERVED_elif)
if (cpp_condition ()) {
++conditional_pp;
return;
}
}
}
static bool ifdef ()
{
Token m = do_yylex ();
return is_macro (m) != -1;
}
/******************************************************************************
Miscellanery
******************************************************************************/
static void cpp_error ()
{
int ii = Ci;
skip_pp_line ();
Ci -= ii;
char *msg = (char*) alloca (2 + Ci);
strncpy (msg, Cpp + ii, Ci);
msg [Ci] = 0;
fprintf (stderr, "ERROR: %s\n", msg);
exit (1);
}
/******************************************************************************
Process a preprocessing line directive
******************************************************************************/
void cpp_directive ()
{
if (skip_ws ()) return;
Token t = do_yylex ();
switch (t) {
case RESERVED_include:
case RESERVED_uses:
include (t == RESERVED_uses);
ncase RESERVED_define:
define ();
ncase RESERVED_undef:
undef ();
ncase RESERVED_ifdef:
if (ifdef ()) ++conditional_pp;
else skip_to_endif (true);
ncase RESERVED_ifndef:
if (!ifdef ()) ++conditional_pp;
else skip_to_endif (true);
ncase RESERVED_else:
if (!conditional_pp)
parse_error_cpp ("#else not in conditional");
--conditional_pp;
skip_to_endif (false);
ncase RESERVED_endif:
if (!conditional_pp)
parse_error_cpp ("#endif without #startif");
--conditional_pp;
skip_pp_line ();
ncase RESERVED_if:
if (!cpp_condition ()) skip_to_endif (true);
else ++conditional_pp;
ncase RESERVED_elif:
if (!conditional_pp) parse_error_cpp ("#elif without #if");
--conditional_pp;
skip_to_endif (false);
ncase RESERVED_error:
cpp_error ();
ncase RESERVED_line:
ndefault:
skip_pp_line ();
// PRINTF ("not implemented\n");
}
}
void setup_cpp (int argc, char **argv)
{
int i, j, id;
char *Idir [128];
for (id = i = 0; i < argc; i++)
if (argv [i][0] == '-')
switch (argv [i][1]) {
case 'I':
Idir [id++] = argv [i][2] == 0 ? argv [++i] : argv [i] + 2;
}
i = 1 + id + sizeof search_dirs / sizeof search_dirs [0];
hsearch = (char**) malloc (i * sizeof *hsearch);
hsearch [0] = "";
for (i = 1, j = 0; j < id; j++)
hsearch [i++] = strdup (Idir [j]);
for (j = 0; search_dirs [j]; j++)
hsearch [i++] = (char*) search_dirs [j];
hsearch [i] = 0;
isearch = hsearch + 1;
}
static void freeintnode (intnode *n)
{
if (n->less) freeintnode (n->less);
if (n->more) freeintnode (n->more);
free (n);
}
static void freemacronode (intnode *n)
{
if (n->less) freeintnode (n->less);
if (n->more) freeintnode (n->more);
free (((macro*)n->v.p)->body);
free (n);
}
void cleanup_cpp ()
{
free (hsearch);
if (included) freeintnode (included);
if (macrotree) freemacronode (macrotree);
}
/************************************************************************
Macro expansions
We deviate from the standard which sais that ``macro arguments are
expanded *before* the macro expansion unless they're followed by
'#' or '##' and then there is a second rescan to reexpand'' doh
************************************************************************/
static Token *expand_predef (Token m)
{
static Token timetok;
char tmp [129];
Token *ret = mallocint (2);
ret [1] = -1;
switch (m) {
case RESERVED___LINE__:
sprintf (tmp, "%i", line);
ret [0] = enter_value (tmp);
ncase RESERVED___FILE__:
sprintf (tmp, "\"%s\"", tfile);
ret [0] = enter_string (tmp);
ncase RESERVED___TIME__:
case RESERVED___DATE__:
if (!timetok) {
time_t t = time (0);
sprintf (tmp, "\"%s", ctime (&t));
*(strchr (tmp, '\n')) = '"';
timetok = enter_string (tmp);
if (strstr (tmp, "Jan 1 "))
fputs ("Happy new year!\n", stderr);
}
ret [0] = timetok;
}
return ret;
}
static Token stringize (Token arg [])
{
char *tmp, *s;
int l, i, j;
for (l = 0, i = 4; arg [l] != -1; l++) {
i += strlen (s = expand (arg [l])) + 1;
for (j = 0; s [j]; j++)
if (s [j] == '\\'
|| s [j] == '"') i++;
}
tmp = (char*) malloc (i);
tmp [0] = '"';
for (l = 0, i = 1; arg [l] != -1; l++) {
s = expand (arg [l]);
while (*s) {
if (*s == '\\' || *s == '"')
tmp [i++] = '\\';
tmp [i++] = *s++;
}
if (arg [l + 1] != -1) tmp [i++] = ' ';
}
tmp [i++] = '"';
tmp [i] = 0;
return enter_string (tmp);
}
static Token concat (OUTSTREAM S, Token a1[], Token a2[])
{
int i, l;
Token con, t;
if (a1 [i = 0] != -1)
while (a1 [i + 1] != -1)
output_itoken (S, a1 [i++]);
if (a2 [0] == -1) return a1 [i];
{
# define EXPAND(x) expand (x == -1 ? BLANKT : x)
char *tmp;
tmp = strcat (strcpy (
(char*) malloc (l = strlen (EXPAND (a1 [i])) + strlen (EXPAND (a2 [0])) + 1),
EXPAND (a1 [i])), EXPAND (a2 [0]));
if ((ISIDENT (a1 [i]) || a1 [i] == -1)
&& (ISIDENT (a2 [0]) || a2 [0] == -1))
con = enter_symbol (tmp);
else {
SAVE_VAR (Cpp, tmp);
SAVE_VAR (Ci, 0);
SAVE_VAR (Clen, l - 1);
con = 0;
while ((t = do_yylex ()) != THE_END) {
if (con) output_itoken (S, con);
con = t;
}
RESTOR_VAR (Cpp);
RESTOR_VAR (Ci);
RESTOR_VAR (Clen);
}
}
if (a2 [1] == -1) return con;
output_itoken (S, con);
for (i = 1; a2 [i + 1] != -1; i++)
output_itoken (S, a2 [i]);
return a2 [i];
}
static Token *expanding, *tops;
static Token *expand_macro_arglist (Token, int, Token*);
static Token *expand_macro_argv (Token m, Token **argv)
{
Token *B = ((macro*) intfind (macrotree, m)->v.p)->body;
Token a1 [] = { 0, -1 }, a2 [] = { 0, -1 }, *a1p, *a2p, b;
int i, n;
OUTSTREAM S = new_stream ();
/* stringnify and concatenate */
for (;(b = *B++) != -1;) {
if (b == '#') {
b = *B++;
if (!ISTPLARG (b))
parse_error_cpp ("'#' not followed by macro argument");
output_itoken (S, stringize (argv [b - ARGBASE]));
continue;
}
if (*B == CPP_CONCAT) {
while (*B == CPP_CONCAT) {
if (!ISTPLARG (b)) a1 [0] = b;
a1p = ISTPLARG (b) ? argv [b - ARGBASE] : a1;
b = B [1];
if (b == -1) parse_error_cpp ("'##' is last");
if (!ISTPLARG (b)) a2 [0] = b;
a2p = ISTPLARG (b) ? argv [b - ARGBASE] : a2;
b = concat (S, a1p, a2p);
B += 2;
}
output_itoken (S, b);
continue;
}
if (ISTPLARG (b))
outprintf (S, ISTR (argv [b - ARGBASE]), -1);
else output_itoken (S, b);
}
B = combine_output (S);
for (i = 0; B [i] != -1; i++)
if (is_macro (B [i]) != -1)
goto further_expands;
return B;
further_expands:
/* macro contains further macros, non-recusrive */
*tops++ = m;
*tops = -1;
S = new_stream ();
for (i = 0; B [i] != -1; i++)
if ((n = is_macro (B [i])) == -1) noexpand:
output_itoken (S, B [i]);
else {
Token m, *E;
m = B [i];
for (E = expanding; *E != -1; E++)
if (*E == m)
goto noexpand;
if (ISPREDEF (m))
E = expand_predef (m);
else if (n == 0)
E = expand_macro_argv (m, 0);
else {
if (B [++i] != '(') parse_error_cpp ("No arguments to macro");
E = expand_macro_arglist (m, n, &B [++i]);
i = skip_buffer_parenthesis (B, i) - 1;
}
outprintf (S, ISTR (E), -1);
free (E);
}
*--tops = -1;
free (B);
return combine_output (S);
}
static Token *expand_macro_arglist (Token m, int argn, Token *s)
{
int argc, i;
Token **parg;
NormPtr pstart, pend;
for (i = 0, argc = 2; s [i] != ')'; i++)
if (s [i] == ',') ++argc;
parg = (Token**) alloca (argc * sizeof (Token*));
pstart = 0, argc = 0;
for (;;) {
pend = pstart;
while (s [pend] != ',' && s [pend] != ')')
if (s [pend] == '(')
pend = skip_buffer_parenthesis (s, pend + 1);
else if (s [pend] == -1)
parse_error_cpp ("Incomplete macro call");
else ++pend;
parg [argc] = allocaint (2 + pend - pstart);
intextract (parg [argc++], s + pstart, pend - pstart);
if (s [pend] == ')') break;
pstart = pend + 1;
}
parg [argc] = 0;
if (argc != argn)
if (argn < VOIDARG || argn == VOIDARG && argc != 1
|| (argn >= VARBOOST && argn - VARBOOST > argc))
parse_error_cpp ("Argument number mismatch");
if (argn >= VARBOOST) {
int i, l;
int j = argn - VARBOOST;
Token *varg;
for (i = j, l = 10; parg [i]; i++)
l += intlen (parg [i]) + 1;
varg = allocaint (l);
varg [0] = -1;
for (i = j; parg [i]; i++) {
intcat (varg, parg [i]);
if (parg [i + 1]) intcatc (varg, ',');
}
parg [j] = varg;
parg [j + 1] = 0;
}
return expand_macro_argv (m, parg);
}
Token *expand_macro (Token m)
{
#ifdef DEBUG
if (0&&debugflag.CPP)
PRINTF ("expanding macro "COLS"%s"COLE"\n", expand (m));
#endif
if (ISPREDEF (m))
return expand_predef (m);
Token rarray [64];
tops = expanding = rarray;
int argn = is_macro (m);
if (!argn) return expand_macro_argv (m, 0);
if (do_yylex () != '(') parse_error_cpp ("No arguments to macro");
Token arglist [256], t;
int i = 0;
while ((arglist [i++] = t = do_yylex ()) != ')')
switch (t) {
case THE_END: parse_error_cpp ("Incomplete arglist");
case '(': {
int po = 1;
while (po) switch (t = arglist [i++] = do_yylex ()) {
case '(': ++po;
ncase ')': --po;
ncase THE_END: parse_error_cpp ("Incomplete arglist");
}
} }
arglist [i] = -1;
return expand_macro_arglist (m, argn, arglist);
}
#endif