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tccpp.c
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tccpp.c
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/*
* TCC - Tiny C Compiler
*
* Copyright (c) 2001-2004 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define USING_GLOBALS
#include "tcc.h"
/* #define to 1 to enable (see parse_pp_string()) */
#define ACCEPT_LF_IN_STRINGS 0
/********************************************************/
/* global variables */
ST_DATA int tok_flags;
ST_DATA int parse_flags;
ST_DATA struct BufferedFile *file;
ST_DATA int tok;
ST_DATA CValue tokc;
ST_DATA const int *macro_ptr;
ST_DATA CString tokcstr; /* current parsed string, if any */
/* display benchmark infos */
ST_DATA int tok_ident;
ST_DATA TokenSym **table_ident;
ST_DATA int pp_expr;
/* ------------------------------------------------------------------------- */
static TokenSym *hash_ident[TOK_HASH_SIZE];
static char token_buf[STRING_MAX_SIZE + 1];
static CString cstr_buf;
static TokenString tokstr_buf;
static TokenString unget_buf;
static unsigned char isidnum_table[256 - CH_EOF];
static int pp_debug_tok, pp_debug_symv;
static int pp_counter;
static void tok_print(const int *str, const char *msg, ...);
static void next_nomacro(void);
static void parse_number(const char *p);
static void parse_string(const char *p, int len);
static struct TinyAlloc *toksym_alloc;
static struct TinyAlloc *tokstr_alloc;
static TokenString *macro_stack;
static const char tcc_keywords[] =
#define DEF(id, str) str "\0"
#include "tcctok.h"
#undef DEF
;
/* WARNING: the content of this string encodes token numbers */
static const unsigned char tok_two_chars[] =
/* outdated -- gr
"<=\236>=\235!=\225&&\240||\241++\244--\242==\224<<\1>>\2+=\253"
"-=\255*=\252/=\257%=\245&=\246^=\336|=\374->\313..\250##\266";
*/{
'<','=', TOK_LE,
'>','=', TOK_GE,
'!','=', TOK_NE,
'&','&', TOK_LAND,
'|','|', TOK_LOR,
'+','+', TOK_INC,
'-','-', TOK_DEC,
'=','=', TOK_EQ,
'<','<', TOK_SHL,
'>','>', TOK_SAR,
'+','=', TOK_A_ADD,
'-','=', TOK_A_SUB,
'*','=', TOK_A_MUL,
'/','=', TOK_A_DIV,
'%','=', TOK_A_MOD,
'&','=', TOK_A_AND,
'^','=', TOK_A_XOR,
'|','=', TOK_A_OR,
'-','>', TOK_ARROW,
'.','.', TOK_TWODOTS,
'#','#', TOK_TWOSHARPS,
0
};
ST_FUNC void skip(int c)
{
if (tok != c) {
char tmp[40];
pstrcpy(tmp, sizeof tmp, get_tok_str(c, &tokc));
tcc_error("'%s' expected (got \"%s\")", tmp, get_tok_str(tok, &tokc));
}
next();
}
ST_FUNC void expect(const char *msg)
{
tcc_error("%s expected", msg);
}
/* ------------------------------------------------------------------------- */
/* Custom allocator for tiny objects */
#define USE_TAL
#ifndef USE_TAL
#define tal_free(al, p) tcc_free(p)
#define tal_realloc(al, p, size) tcc_realloc(p, size)
#define tal_new(a,b,c)
#define tal_delete(a)
#else
#if !defined(MEM_DEBUG)
#define tal_free(al, p) tal_free_impl(al, p)
#define tal_realloc(al, p, size) tal_realloc_impl(&al, p, size)
#define TAL_DEBUG_PARAMS
#else
#define TAL_DEBUG MEM_DEBUG
//#define TAL_INFO 1 /* collect and dump allocators stats */
#define tal_free(al, p) tal_free_impl(al, p, __FILE__, __LINE__)
#define tal_realloc(al, p, size) tal_realloc_impl(&al, p, size, __FILE__, __LINE__)
#define TAL_DEBUG_PARAMS , const char *file, int line
#define TAL_DEBUG_FILE_LEN 40
#endif
#define TOKSYM_TAL_SIZE (768 * 1024) /* allocator for tiny TokenSym in table_ident */
#define TOKSTR_TAL_SIZE (768 * 1024) /* allocator for tiny TokenString instances */
#define TOKSYM_TAL_LIMIT 256 /* prefer unique limits to distinguish allocators debug msgs */
#define TOKSTR_TAL_LIMIT 1024 /* 256 * sizeof(int) */
typedef struct TinyAlloc {
unsigned limit;
unsigned size;
uint8_t *buffer;
uint8_t *p;
unsigned nb_allocs;
struct TinyAlloc *next, *top;
#ifdef TAL_INFO
unsigned nb_peak;
unsigned nb_total;
unsigned nb_missed;
uint8_t *peak_p;
#endif
} TinyAlloc;
typedef struct tal_header_t {
unsigned size;
#ifdef TAL_DEBUG
int line_num; /* negative line_num used for double free check */
char file_name[TAL_DEBUG_FILE_LEN + 1];
#endif
} tal_header_t;
/* ------------------------------------------------------------------------- */
static TinyAlloc *tal_new(TinyAlloc **pal, unsigned limit, unsigned size)
{
TinyAlloc *al = tcc_mallocz(sizeof(TinyAlloc));
al->p = al->buffer = tcc_malloc(size);
al->limit = limit;
al->size = size;
if (pal) *pal = al;
return al;
}
static void tal_delete(TinyAlloc *al)
{
TinyAlloc *next;
tail_call:
if (!al)
return;
#ifdef TAL_INFO
fprintf(stderr, "limit %4d size %7d nb_peak %5d nb_total %7d nb_missed %5d usage %5.1f%%\n",
al->limit, al->size, al->nb_peak, al->nb_total, al->nb_missed,
(al->peak_p - al->buffer) * 100.0 / al->size);
#endif
#if TAL_DEBUG && TAL_DEBUG != 3 /* do not check TAL leaks with -DMEM_DEBUG=3 */
if (al->nb_allocs > 0) {
uint8_t *p;
fprintf(stderr, "TAL_DEBUG: memory leak %d chunk(s) (limit= %d)\n",
al->nb_allocs, al->limit);
p = al->buffer;
while (p < al->p) {
tal_header_t *header = (tal_header_t *)p;
if (header->line_num > 0) {
fprintf(stderr, "%s:%d: chunk of %d bytes leaked\n",
header->file_name, header->line_num, header->size);
}
p += header->size + sizeof(tal_header_t);
}
#if TAL_DEBUG == 2
exit(2);
#endif
}
#endif
next = al->next;
tcc_free(al->buffer);
tcc_free(al);
al = next;
goto tail_call;
}
static void tal_free_impl(TinyAlloc *al, void *p TAL_DEBUG_PARAMS)
{
if (!p)
return;
tail_call:
if (al->buffer <= (uint8_t *)p && (uint8_t *)p < al->buffer + al->size) {
#ifdef TAL_DEBUG
tal_header_t *header = (((tal_header_t *)p) - 1);
if (header->line_num < 0) {
fprintf(stderr, "%s:%d: TAL_DEBUG: double frees chunk from\n",
file, line);
fprintf(stderr, "%s:%d: %d bytes\n",
header->file_name, (int)-header->line_num, (int)header->size);
} else
header->line_num = -header->line_num;
#endif
al->nb_allocs--;
if (!al->nb_allocs)
al->p = al->buffer;
} else if (al->next) {
al = al->next;
goto tail_call;
}
else
tcc_free(p);
}
static void *tal_realloc_impl(TinyAlloc **pal, void *p, unsigned size TAL_DEBUG_PARAMS)
{
tal_header_t *header;
void *ret;
int is_own;
unsigned adj_size = (size + 3) & -4;
TinyAlloc *al = *pal;
tail_call:
is_own = (al->buffer <= (uint8_t *)p && (uint8_t *)p < al->buffer + al->size);
if ((!p || is_own) && size <= al->limit) {
if (al->p - al->buffer + adj_size + sizeof(tal_header_t) < al->size) {
header = (tal_header_t *)al->p;
header->size = adj_size;
#ifdef TAL_DEBUG
{ int ofs = strlen(file) - TAL_DEBUG_FILE_LEN;
strncpy(header->file_name, file + (ofs > 0 ? ofs : 0), TAL_DEBUG_FILE_LEN);
header->file_name[TAL_DEBUG_FILE_LEN] = 0;
header->line_num = line; }
#endif
ret = al->p + sizeof(tal_header_t);
al->p += adj_size + sizeof(tal_header_t);
if (is_own) {
header = (((tal_header_t *)p) - 1);
if (p) memcpy(ret, p, header->size);
#ifdef TAL_DEBUG
header->line_num = -header->line_num;
#endif
} else {
al->nb_allocs++;
}
#ifdef TAL_INFO
if (al->nb_peak < al->nb_allocs)
al->nb_peak = al->nb_allocs;
if (al->peak_p < al->p)
al->peak_p = al->p;
al->nb_total++;
#endif
return ret;
} else if (is_own) {
al->nb_allocs--;
ret = tal_realloc(*pal, 0, size);
header = (((tal_header_t *)p) - 1);
if (p) memcpy(ret, p, header->size);
#ifdef TAL_DEBUG
header->line_num = -header->line_num;
#endif
return ret;
}
if (al->next) {
al = al->next;
} else {
TinyAlloc *bottom = al, *next = al->top ? al->top : al;
al = tal_new(pal, next->limit, next->size * 2);
al->next = next;
bottom->top = al;
}
goto tail_call;
}
if (is_own) {
al->nb_allocs--;
ret = tcc_malloc(size);
header = (((tal_header_t *)p) - 1);
if (p) memcpy(ret, p, header->size);
#ifdef TAL_DEBUG
header->line_num = -header->line_num;
#endif
} else if (al->next) {
al = al->next;
goto tail_call;
} else
ret = tcc_realloc(p, size);
#ifdef TAL_INFO
al->nb_missed++;
#endif
return ret;
}
#endif /* USE_TAL */
/* ------------------------------------------------------------------------- */
/* CString handling */
static void cstr_realloc(CString *cstr, int new_size)
{
int size;
size = cstr->size_allocated;
if (size < 8)
size = 8; /* no need to allocate a too small first string */
while (size < new_size)
size = size * 2;
cstr->data = tcc_realloc(cstr->data, size);
cstr->size_allocated = size;
}
/* add a byte */
ST_INLN void cstr_ccat(CString *cstr, int ch)
{
int size;
size = cstr->size + 1;
if (size > cstr->size_allocated)
cstr_realloc(cstr, size);
cstr->data[size - 1] = ch;
cstr->size = size;
}
ST_INLN char *unicode_to_utf8 (char *b, uint32_t Uc)
{
if (Uc<0x80) *b++=Uc;
else if (Uc<0x800) *b++=192+Uc/64, *b++=128+Uc%64;
else if (Uc-0xd800u<0x800) goto error;
else if (Uc<0x10000) *b++=224+Uc/4096, *b++=128+Uc/64%64, *b++=128+Uc%64;
else if (Uc<0x110000) *b++=240+Uc/262144, *b++=128+Uc/4096%64, *b++=128+Uc/64%64, *b++=128+Uc%64;
else error: tcc_error("0x%x is not a valid universal character", Uc);
return b;
}
/* add a unicode character expanded into utf8 */
ST_INLN void cstr_u8cat(CString *cstr, int ch)
{
char buf[4], *e;
e = unicode_to_utf8(buf, (uint32_t)ch);
cstr_cat(cstr, buf, e - buf);
}
/* add string of 'len', or of its len/len+1 when 'len' == -1/0 */
ST_FUNC void cstr_cat(CString *cstr, const char *str, int len)
{
int size;
if (len <= 0)
len = strlen(str) + 1 + len;
size = cstr->size + len;
if (size > cstr->size_allocated)
cstr_realloc(cstr, size);
memmove(cstr->data + cstr->size, str, len);
cstr->size = size;
}
/* add a wide char */
ST_FUNC void cstr_wccat(CString *cstr, int ch)
{
int size;
size = cstr->size + sizeof(nwchar_t);
if (size > cstr->size_allocated)
cstr_realloc(cstr, size);
*(nwchar_t *)(cstr->data + size - sizeof(nwchar_t)) = ch;
cstr->size = size;
}
ST_FUNC void cstr_new(CString *cstr)
{
memset(cstr, 0, sizeof(CString));
}
/* free string and reset it to NULL */
ST_FUNC void cstr_free(CString *cstr)
{
tcc_free(cstr->data);
}
/* reset string to empty */
ST_FUNC void cstr_reset(CString *cstr)
{
cstr->size = 0;
}
ST_FUNC int cstr_vprintf(CString *cstr, const char *fmt, va_list ap)
{
va_list v;
int len, size = 80;
for (;;) {
size += cstr->size;
if (size > cstr->size_allocated)
cstr_realloc(cstr, size);
size = cstr->size_allocated - cstr->size;
va_copy(v, ap);
len = vsnprintf(cstr->data + cstr->size, size, fmt, v);
va_end(v);
if (len >= 0 && len < size)
break;
size *= 2;
}
cstr->size += len;
return len;
}
ST_FUNC int cstr_printf(CString *cstr, const char *fmt, ...)
{
va_list ap; int len;
va_start(ap, fmt);
len = cstr_vprintf(cstr, fmt, ap);
va_end(ap);
return len;
}
/* XXX: unicode ? */
static void add_char(CString *cstr, int c)
{
if (c == '\'' || c == '\"' || c == '\\') {
/* XXX: could be more precise if char or string */
cstr_ccat(cstr, '\\');
}
if (c >= 32 && c <= 126) {
cstr_ccat(cstr, c);
} else {
cstr_ccat(cstr, '\\');
if (c == '\n') {
cstr_ccat(cstr, 'n');
} else {
cstr_ccat(cstr, '0' + ((c >> 6) & 7));
cstr_ccat(cstr, '0' + ((c >> 3) & 7));
cstr_ccat(cstr, '0' + (c & 7));
}
}
}
/* ------------------------------------------------------------------------- */
/* allocate a new token */
static TokenSym *tok_alloc_new(TokenSym **pts, const char *str, int len)
{
TokenSym *ts, **ptable;
int i;
if (tok_ident >= SYM_FIRST_ANOM)
tcc_error("memory full (symbols)");
/* expand token table if needed */
i = tok_ident - TOK_IDENT;
if ((i % TOK_ALLOC_INCR) == 0) {
ptable = tcc_realloc(table_ident, (i + TOK_ALLOC_INCR) * sizeof(TokenSym *));
table_ident = ptable;
}
ts = tal_realloc(toksym_alloc, 0, sizeof(TokenSym) + len);
table_ident[i] = ts;
ts->tok = tok_ident++;
ts->sym_define = NULL;
ts->sym_label = NULL;
ts->sym_struct = NULL;
ts->sym_identifier = NULL;
ts->len = len;
ts->hash_next = NULL;
memcpy(ts->str, str, len);
ts->str[len] = '\0';
*pts = ts;
return ts;
}
#define TOK_HASH_INIT 1
#define TOK_HASH_FUNC(h, c) ((h) + ((h) << 5) + ((h) >> 27) + (c))
/* find a token and add it if not found */
ST_FUNC TokenSym *tok_alloc(const char *str, int len)
{
TokenSym *ts, **pts;
int i;
unsigned int h;
h = TOK_HASH_INIT;
for(i=0;i<len;i++)
h = TOK_HASH_FUNC(h, ((unsigned char *)str)[i]);
h &= (TOK_HASH_SIZE - 1);
pts = &hash_ident[h];
for(;;) {
ts = *pts;
if (!ts)
break;
if (ts->len == len && !memcmp(ts->str, str, len))
return ts;
pts = &(ts->hash_next);
}
return tok_alloc_new(pts, str, len);
}
ST_FUNC int tok_alloc_const(const char *str)
{
return tok_alloc(str, strlen(str))->tok;
}
/* XXX: buffer overflow */
/* XXX: float tokens */
ST_FUNC const char *get_tok_str(int v, CValue *cv)
{
char *p;
int i, len;
cstr_reset(&cstr_buf);
p = cstr_buf.data;
switch(v) {
case TOK_CINT:
case TOK_CUINT:
case TOK_CLONG:
case TOK_CULONG:
case TOK_CLLONG:
case TOK_CULLONG:
/* XXX: not quite exact, but only useful for testing */
#ifdef _WIN32
sprintf(p, "%u", (unsigned)cv->i);
#else
sprintf(p, "%llu", (unsigned long long)cv->i);
#endif
break;
case TOK_LCHAR:
cstr_ccat(&cstr_buf, 'L');
case TOK_CCHAR:
cstr_ccat(&cstr_buf, '\'');
add_char(&cstr_buf, cv->i);
cstr_ccat(&cstr_buf, '\'');
cstr_ccat(&cstr_buf, '\0');
break;
case TOK_PPNUM:
case TOK_PPSTR:
return (char*)cv->str.data;
case TOK_LSTR:
cstr_ccat(&cstr_buf, 'L');
case TOK_STR:
cstr_ccat(&cstr_buf, '\"');
if (v == TOK_STR) {
len = cv->str.size - 1;
for(i=0;i<len;i++)
add_char(&cstr_buf, ((unsigned char *)cv->str.data)[i]);
} else {
len = (cv->str.size / sizeof(nwchar_t)) - 1;
for(i=0;i<len;i++)
add_char(&cstr_buf, ((nwchar_t *)cv->str.data)[i]);
}
cstr_ccat(&cstr_buf, '\"');
cstr_ccat(&cstr_buf, '\0');
break;
case TOK_CFLOAT:
return strcpy(p, "<float>");
case TOK_CDOUBLE:
return strcpy(p, "<double>");
case TOK_CLDOUBLE:
return strcpy(p, "<long double>");
case TOK_LINENUM:
return strcpy(p, "<linenumber>");
/* above tokens have value, the ones below don't */
case TOK_LT:
v = '<';
goto addv;
case TOK_GT:
v = '>';
goto addv;
case TOK_DOTS:
return strcpy(p, "...");
case TOK_A_SHL:
return strcpy(p, "<<=");
case TOK_A_SAR:
return strcpy(p, ">>=");
case TOK_EOF:
return strcpy(p, "<eof>");
case 0: /* anonymous nameless symbols */
return strcpy(p, "<no name>");
default:
v &= ~(SYM_FIELD | SYM_STRUCT);
if (v < TOK_IDENT) {
/* search in two bytes table */
const unsigned char *q = tok_two_chars;
while (*q) {
if (q[2] == v) {
*p++ = q[0];
*p++ = q[1];
*p = '\0';
return cstr_buf.data;
}
q += 3;
}
if (v >= 127 || (v < 32 && !is_space(v) && v != '\n')) {
sprintf(p, "<\\x%02x>", v);
break;
}
addv:
*p++ = v;
*p = '\0';
} else if (v < tok_ident) {
return table_ident[v - TOK_IDENT]->str;
} else if (v >= SYM_FIRST_ANOM) {
/* special name for anonymous symbol */
sprintf(p, "L.%u", v - SYM_FIRST_ANOM);
} else {
/* should never happen */
return NULL;
}
break;
}
return cstr_buf.data;
}
/* return the current character, handling end of block if necessary
(but not stray) */
static int handle_eob(void)
{
BufferedFile *bf = file;
int len;
/* only tries to read if really end of buffer */
if (bf->buf_ptr >= bf->buf_end) {
if (bf->fd >= 0) {
#if defined(PARSE_DEBUG)
len = 1;
#else
len = IO_BUF_SIZE;
#endif
len = read(bf->fd, bf->buffer, len);
if (len < 0)
len = 0;
} else {
len = 0;
}
total_bytes += len;
bf->buf_ptr = bf->buffer;
bf->buf_end = bf->buffer + len;
*bf->buf_end = CH_EOB;
}
if (bf->buf_ptr < bf->buf_end) {
return bf->buf_ptr[0];
} else {
bf->buf_ptr = bf->buf_end;
return CH_EOF;
}
}
/* read next char from current input file and handle end of input buffer */
static int next_c(void)
{
int ch = *++file->buf_ptr;
/* end of buffer/file handling */
if (ch == CH_EOB && file->buf_ptr >= file->buf_end)
ch = handle_eob();
return ch;
}
/* input with '\[\r]\n' handling. */
static int handle_stray_noerror(int err)
{
int ch;
while ((ch = next_c()) == '\\') {
ch = next_c();
if (ch == '\n') {
newl:
file->line_num++;
} else {
if (ch == '\r') {
ch = next_c();
if (ch == '\n')
goto newl;
*--file->buf_ptr = '\r';
}
if (err)
tcc_error("stray '\\' in program");
/* may take advantage of 'BufferedFile.unget[4}' */
return *--file->buf_ptr = '\\';
}
}
return ch;
}
#define ninp() handle_stray_noerror(0)
/* handle '\\' in strings, comments and skipped regions */
static int handle_bs(uint8_t **p)
{
int c;
file->buf_ptr = *p - 1;
c = ninp();
*p = file->buf_ptr;
return c;
}
/* skip the stray and handle the \\n case. Output an error if
incorrect char after the stray */
static int handle_stray(uint8_t **p)
{
int c;
file->buf_ptr = *p - 1;
c = handle_stray_noerror(!(parse_flags & PARSE_FLAG_ACCEPT_STRAYS));
*p = file->buf_ptr;
return c;
}
/* handle the complicated stray case */
#define PEEKC(c, p)\
{\
c = *++p;\
if (c == '\\')\
c = handle_stray(&p); \
}
static int skip_spaces(void)
{
int ch;
--file->buf_ptr;
do {
ch = ninp();
} while (isidnum_table[ch - CH_EOF] & IS_SPC);
return ch;
}
/* single line C++ comments */
static uint8_t *parse_line_comment(uint8_t *p)
{
int c;
for(;;) {
for (;;) {
c = *++p;
redo:
if (c == '\n' || c == '\\')
break;
c = *++p;
if (c == '\n' || c == '\\')
break;
}
if (c == '\n')
break;
c = handle_bs(&p);
if (c == CH_EOF)
break;
if (c != '\\')
goto redo;
}
return p;
}
/* C comments */
static uint8_t *parse_comment(uint8_t *p)
{
int c;
for(;;) {
/* fast skip loop */
for(;;) {
c = *++p;
redo:
if (c == '\n' || c == '*' || c == '\\')
break;
c = *++p;
if (c == '\n' || c == '*' || c == '\\')
break;
}
/* now we can handle all the cases */
if (c == '\n') {
file->line_num++;
} else if (c == '*') {
do {
c = *++p;
} while (c == '*');
if (c == '\\')
c = handle_bs(&p);
if (c == '/')
break;
goto check_eof;
} else {
c = handle_bs(&p);
check_eof:
if (c == CH_EOF)
tcc_error("unexpected end of file in comment");
if (c != '\\')
goto redo;
}
}
return p + 1;
}
/* parse a string without interpreting escapes */
static uint8_t *parse_pp_string(uint8_t *p, int sep, CString *str)
{
int c;
for(;;) {
c = *++p;
redo:
if (c == sep) {
break;
} else if (c == '\\') {
c = handle_bs(&p);
if (c == CH_EOF) {
unterminated_string:
/* XXX: indicate line number of start of string */
tok_flags &= ~TOK_FLAG_BOL;
tcc_error("missing terminating %c character", sep);
} else if (c == '\\') {
if (str)
cstr_ccat(str, c);
c = *++p;
/* add char after '\\' unconditionally */
if (c == '\\') {
c = handle_bs(&p);
if (c == CH_EOF)
goto unterminated_string;
}
goto add_char;
} else {
goto redo;
}
} else if (c == '\n') {
add_lf:
if (ACCEPT_LF_IN_STRINGS) {
file->line_num++;
goto add_char;
} else if (str) { /* not skipping */
goto unterminated_string;
} else {
//tcc_warning("missing terminating %c character", sep);
return p;
}
} else if (c == '\r') {
c = *++p;
if (c == '\\')
c = handle_bs(&p);
if (c == '\n')
goto add_lf;
if (c == CH_EOF)
goto unterminated_string;
if (str)
cstr_ccat(str, '\r');
goto redo;
} else {
add_char:
if (str)
cstr_ccat(str, c);
}
}
p++;
return p;
}
/* skip block of text until #else, #elif or #endif. skip also pairs of
#if/#endif */
static void preprocess_skip(void)
{
int a, start_of_line, c, in_warn_or_error;
uint8_t *p;
p = file->buf_ptr;
a = 0;
redo_start:
start_of_line = 1;
in_warn_or_error = 0;
for(;;) {
c = *p;
switch(c) {
case ' ':
case '\t':
case '\f':
case '\v':
case '\r':
p++;
continue;
case '\n':
file->line_num++;
p++;
goto redo_start;
case '\\':
c = handle_bs(&p);
if (c == CH_EOF)
expect("#endif");
if (c == '\\')
++p;
continue;
/* skip strings */
case '\"':
case '\'':
if (in_warn_or_error)
goto _default;
tok_flags &= ~TOK_FLAG_BOL;
p = parse_pp_string(p, c, NULL);
break;
/* skip comments */
case '/':
if (in_warn_or_error)
goto _default;
++p;
c = handle_bs(&p);
if (c == '*') {
p = parse_comment(p);
} else if (c == '/') {
p = parse_line_comment(p);
}
continue;
case '#':
p++;
if (start_of_line) {
file->buf_ptr = p;
next_nomacro();
p = file->buf_ptr;
if (a == 0 &&
(tok == TOK_ELSE || tok == TOK_ELIF || tok == TOK_ENDIF))
goto the_end;
if (tok == TOK_IF || tok == TOK_IFDEF || tok == TOK_IFNDEF)
a++;
else if (tok == TOK_ENDIF)
a--;
else if( tok == TOK_ERROR || tok == TOK_WARNING)
in_warn_or_error = 1;
else if (tok == TOK_LINEFEED)
goto redo_start;
else if (parse_flags & PARSE_FLAG_ASM_FILE)
p = parse_line_comment(p - 1);
}
#if !defined(TCC_TARGET_ARM)
else if (parse_flags & PARSE_FLAG_ASM_FILE)
p = parse_line_comment(p - 1);
#else
/* ARM assembly uses '#' for constants */
#endif
break;
_default:
default:
p++;
break;
}
start_of_line = 0;
}
the_end: ;
file->buf_ptr = p;
}
#if 0
/* return the number of additional 'ints' necessary to store the
token */
static inline int tok_size(const int *p)
{
switch(*p) {
/* 4 bytes */
case TOK_CINT:
case TOK_CUINT:
case TOK_CCHAR:
case TOK_LCHAR:
case TOK_CFLOAT:
case TOK_LINENUM:
return 1 + 1;
case TOK_STR:
case TOK_LSTR:
case TOK_PPNUM:
case TOK_PPSTR:
return 1 + 1 + (p[1] + 3) / 4;
case TOK_CLONG:
case TOK_CULONG:
return 1 + LONG_SIZE / 4;
case TOK_CDOUBLE:
case TOK_CLLONG:
case TOK_CULLONG:
return 1 + 2;
case TOK_CLDOUBLE:
#ifdef TCC_USING_DOUBLE_FOR_LDOUBLE
return 1 + 8 / 4;
#else
return 1 + LDOUBLE_SIZE / 4;
#endif
default:
return 1 + 0;