ref: 195cc1977d51217abaf20467714bc78c320221cd
dir: /cc1/cpp.c/
#include <ctype.h>
#include <inttypes.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "../inc/sizes.h"
#include "../inc/cc.h"
#include "cc1.h"
#ifndef PREFIX
#define PREFIX "/usr/include/local"
#endif
static char *argp, *macroname;
static unsigned arglen;
static Symbol *symline, *symfile;
static unsigned char ifstatus[NR_COND];
unsigned cppctx;
int disexpand;
static Symbol *
defmacro(char *s)
{
Symbol *sym;
strcpy(yytext, s);
sym = lookup(NS_CPP);
sym->flags |= ISDEFINED;
return sym;
}
void
icpp(void)
{
static char sdate[17], stime[14];
struct tm *tm;
time_t t;
char **bp, *list[] = {
"__STDC__",
"__STDC_HOSTED__",
"__SCC__",
NULL
};
t = time(NULL);
tm = localtime(&t);
strftime(sdate, sizeof(sdate), "-1#\"%b %d %Y\"", tm);
strftime(stime, sizeof(stime), "-1#\"%H:%M:%S\"", tm);
defmacro("__DATE__")->u.s = sdate;
defmacro("__TIME__")->u.s = stime;
defmacro("__STDC_VERSION__")->u.s = "-1#199409L";
symline = defmacro("__LINE__");
symfile = defmacro("__FILE__");
for (bp = list; *bp; ++bp)
defmacro(*bp)->u.s = "-1#1";
}
static void
nextcpp(void)
{
next();
if (yytoken == EOFTOK)
error("unterminated argument list invoking macro \"%s\"",
macroname);
if (yylen + 1 > arglen)
error("argument overflow invoking macro \"%s\"",
macroname);
memcpy(argp, yytext, yylen);
argp += yylen;
*argp++ = ' ';
arglen -= yylen + 1;
}
static void
paren(void)
{
for (;;) {
nextcpp();
switch (yytoken) {
case ')':
return;
case '(':
paren();
break;
}
}
}
static void
parameter(void)
{
for (;;) {
nextcpp();
switch (yytoken) {
case ')':
case ',':
argp -= 3; /* remove " , " or " ) "*/
*argp++ = '\0';
return;
case '(':
paren();
break;
}
}
}
static int
parsepars(char *buffer, char **listp, int nargs)
{
int n;
if (nargs == -1)
return -1;
if (ahead() != '(' && nargs > 0)
return 0;
disexpand = 1;
next();
n = 0;
argp = buffer;
arglen = INPUTSIZ;
if (yytoken != ')') {
do {
*listp++ = argp;
parameter();
} while (++n < NR_MACROARG && yytoken == ',');
}
if (yytoken != ')')
error("incorrect macro function alike invocation");
disexpand = 0;
if (n == NR_MACROARG)
error("too much parameters in macro \"%s\"", macroname);
if (n != nargs) {
error("macro \"%s\" passed %d arguments, but it takes %d",
macroname, n, nargs);
}
return 1;
}
static size_t
copymacro(char *buffer, char *s, size_t bufsiz, char *arglist[])
{
char prevc, c, *arg, *bp = buffer;
for (prevc = '\0'; c = *s; prevc = c, ++s) {
if (c != '@') {
if (c == '#')
continue;
if (bufsiz-- == 0)
goto expansion_too_long;
*bp++ = c;
} else {
size_t size;
if (prevc == '#')
bufsiz -= 2;
arg = arglist[atoi(++s)];
size = strlen(arg);
if (size > bufsiz)
goto expansion_too_long;
if (prevc == '#')
*bp++ = '"';
memcpy(bp, arg, size);
bp += size;
if (prevc == '#')
*bp++ = '"';
bufsiz -= size;
s += 2;
}
}
*bp = '\0';
return bp - buffer;
expansion_too_long:
error("expansion of macro \"%s\" is too long", macroname);
}
#define BUFSIZE ((INPUTSIZ > FILENAME_MAX+2) ? INPUTSIZ : FILENAME_MAX+2)
bool
expand(char *begin, Symbol *sym)
{
size_t total, elen, rlen, llen, ilen;
int n;
char *s = sym->u.s;
char *arglist[NR_MACROARG], arguments[INPUTSIZ], buffer[BUFSIZE];
macroname = sym->name;
if (sym == symfile) {
elen = sprintf(buffer, "\"%s\" ", input->fname);
goto substitute;
}
if (sym == symline) {
elen = sprintf(buffer, "%d ", input->nline);
goto substitute;
}
if (!parsepars(arguments, arglist, atoi(s)))
return 0;
for (n = 0; n < atoi(s); ++n)
fprintf(stderr, "MACRO par%d:%s\n", n, arglist[n]);
elen = copymacro(buffer, s+3, INPUTSIZ-1, arglist);
substitute:
fprintf(stderr, "MACRO '%s' expanded to :'%s'\n", macroname, buffer);
rlen = strlen(input->p); /* rigth length */
llen = begin - input->line; /* left length */
ilen = input->p - begin; /* invocation length */
total = llen + elen + rlen;
if (total >= LINESIZ)
error("macro expansion too long");
/* cut macro invocation */
memmove(begin, begin + ilen, rlen);
/* paste macro expansion */
memmove(begin + elen, begin, rlen);
memcpy(begin, buffer, elen);
input->line[total] = '\0';
input->p = input->begin = begin;
return 1;
}
#undef BUFSIZE
static int
getpars(Symbol *args[NR_MACROARG])
{
int n = -1;
char *err;
if (!accept('('))
return n;
++n;
if (accept(')'))
return n;
do {
if (n == NR_MACROARG) {
err = "too much parameters in macro";
goto popctx_and_error;
}
if (yytoken != IDEN) {
err = "macro arguments must be identifiers";
goto popctx_and_error;
}
args[n++] = yylval.sym;
next();
} while (accept(','));
expect(')');
return n;
popctx_and_error:
popctx();
error(err);
}
static void
getdefs(Symbol *args[NR_MACROARG], int nargs, char *bp, size_t bufsiz)
{
Symbol **argp;
char *err;
size_t len;
int prevc = 0, ispar;
for (;;) {
ispar = 0;
if (yytoken == IDEN) {
for (argp = args; argp < &args[nargs]; ++argp) {
if (*argp == yylval.sym)
break;
}
if (argp != &args[nargs]) {
sprintf(yytext, "@%02d@", argp - args);
ispar = 1;
}
}
if (prevc == '#' && !ispar)
goto bad_stringer;
if (yytoken == EOFTOK)
break;
if ((len = strlen(yytext)) >= bufsiz) {
err = "too long macro";
goto popctx_and_error;
}
memcpy(bp, yytext, len);
bp += len;
bufsiz -= len;
if ((prevc = yytoken) != '#')
*bp++ = ' ';
next();
}
*bp = '\0';
return;
bad_stringer:
err = "'#' is not followed by a macro parameter";
popctx_and_error:
popctx();
error(err);
}
static void
define(void)
{
Symbol *sym,*args[NR_MACROARG];
char buff[LINESIZ+1];
int n;
if (cppoff)
return;
if (yytoken != IDEN)
error("macro names must be identifiers");
sym = yylval.sym;
if ((sym->flags & ISDEFINED) && sym->ns == NS_CPP) {
warn("'%s' redefined", yytext);
free(sym->u.s);
} else if (sym->ns != NS_CPP) {
sym = lookup(NS_CPP);
}
sym->flags |= ISDEFINED;
pushctx();
next();
n = getpars(args);
sprintf(buff, "%02d#", n);
getdefs(args, n, buff+3, LINESIZ-3);
sym->u.s = xstrdup(buff);
fprintf(stderr, "Defining macro '%s'='%s'\n", sym->name, buff);
popctx();
}
static void
include(void)
{
char **bp, *p, file[FILENAME_MAX], path[FILENAME_MAX];
static char *sysinclude[] = {
PREFIX"/include/",
PREFIX"/local/include/",
NULL
};
size_t filelen, dirlen;
if (cppoff)
return;
switch (*yytext) {
case '<':
if ((p = strchr(input->begin, '>')) == NULL)
goto bad_include;
*p = '\0';
if (p - input->begin >= FILENAME_MAX)
goto too_long;
strcpy(file, input->begin);
input->begin = input->p = p+1;
next();
break;
case '"':
if ((p = strchr(yytext + 1, '"')) == NULL)
goto bad_include;
*p = '\0';
if (p - yytext + 1 >= FILENAME_MAX)
goto too_long;
strcpy(file, yytext + 1);
next();
if (addinput(file))
return;
break;
default:
goto bad_include;
}
filelen = strlen(file);
for (bp = sysinclude; *bp; ++bp) {
dirlen = strlen(*bp);
if (dirlen + filelen > FILENAME_MAX-1)
continue;
memcpy(path, *bp, dirlen);
memcpy(path+dirlen, file, filelen);
if (addinput(path))
break;
}
if (*bp)
error("included file '%s' not found", file);
return;
bad_include:
error("#include expects \"FILENAME\" or <FILENAME>");
too_long:
error("#include FILENAME too long");
}
static void
line(void)
{
long n;
char *endp;
if (cppoff)
return;
n = strtol(yytext, &endp, 10);
if (n <= 0 || n > USHRT_MAX || *endp != '\0')
error("first parameter of #line is not a positive integer");
input->nline = yylval.sym->u.i;
next();
if (yytoken == EOFTOK)
return;
if (*yytext != '\"' || yylen == 1)
error("second parameter of #line is not a valid filename");
free(input->fname);
input->fname = xstrdup(yylval.sym->u.s);
next();
}
static void
pragma(void)
{
if (cppoff)
return;
/* TODO: discard input */
}
static void
usererr(void)
{
if (cppoff)
return;
printerr("#error %s", input->p);
*input->p = '\0';
next();
}
static void
ifclause(int isdef)
{
Symbol *sym;
unsigned n;
int status;
if (cppctx == NR_COND-1)
error("too much nesting levels of conditional inclusion");
n = cppctx++;
if (yytoken != IDEN) {
error("no macro name given in #%s directive",
(isdef) ? "ifdef" : "ifndef");
}
sym = lookup(NS_CPP);
next();
status = (sym->flags & ISDEFINED) != 0 == isdef;
if (!(ifstatus[n] = status))
++cppoff;
}
static void
ifdef(void)
{
ifclause(1);
}
static void
ifndef(void)
{
ifclause(0);
}
static void
endif(void)
{
if (cppctx == 0)
error("#endif without #if");
if (!ifstatus[--cppctx])
--cppoff;
}
static void
elseclause(void)
{
int status;
if (cppctx == 0)
error("#else without #ifdef/ifndef");
status = (ifstatus[cppctx-1] ^= 1);
cppoff += (status) ? -1 : 1;
}
static void
undef(void)
{
Symbol *sym;
if (cppoff)
return;
if (yytoken != IDEN) {
error("no macro name given in #undef directive");
return;
}
sym = lookup(NS_CPP);
sym->flags &= ~ISDEFINED;
next();
}
bool
cpp(void)
{
static struct {
uint8_t tok;
void (*fun)(void);
} *bp, clauses [] = {
{DEFINE, define},
{INCLUDE, include},
{LINE, line},
{IFDEF, ifdef},
{IFNDEF, ifndef},
{ELSE, elseclause},
{ENDIF, endif},
{UNDEF, undef},
{PRAGMA, pragma},
{ERROR, usererr},
{0, NULL}
};
if (*input->p != '#')
return 0;
++input->p;
disexpand = 1;
lexmode = CPPMODE;
setnamespace(NS_CPPCLAUSES);
next();
for (bp = clauses; bp->tok && bp->tok != yytoken; ++bp)
/* nothing */;
if (!bp->tok)
error("incorrect preprocessor directive");
next();
(*bp->fun)();
if (yytoken != EOFTOK && !cppoff)
error("trailing characters after preprocessor directive");
disexpand = 0;
lexmode = CCMODE;
return 1;
}