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ravi/dmr_c/src/tokenize.c

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/*
* This is a really stupid C tokenizer. It doesn't do any include
* files or anything complex at all. That's the preprocessor.
*
* Copyright (C) 2003 Transmeta Corp.
* 2003 Linus Torvalds
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/*
* This version is part of the dmr_c project.
* Copyright (C) 2017 Dibyendu Majumdar
*/
#include <assert.h>
#include <ctype.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <allocate.h>
#include <lib.h>
#include <port.h>
#include <symbol.h>
#include <token.h>
#define EOF (-1)
#define BUFSIZE (8192)
typedef struct {
int fd, offset, size;
int pos, line, nr;
int newline, whitespace;
struct token **tokenlist;
struct token *token;
unsigned char *buffer;
} stream_t;
const char *dmrC_stream_name(struct dmr_C *C, int stream)
{
if (stream == 0 && C->T->input_stream_nr == 0)
return "<buffer>";
if (stream < 0 || stream > C->T->input_stream_nr)
return "<bad stream>";
return C->T->input_streams[stream].name;
}
static struct position stream_pos(stream_t *stream)
{
struct position pos;
pos.type = 0;
pos.stream = stream->nr;
pos.newline = stream->newline;
pos.whitespace = stream->whitespace;
pos.pos = stream->pos;
pos.line = stream->line;
pos.noexpand = 0;
return pos;
}
const char *dmrC_show_special(struct dmr_C *C, int val)
{
C->T->special_buffer[0] = val;
C->T->special_buffer[1] = 0;
if (val >= SPECIAL_BASE)
strcpy(C->T->special_buffer,
(char *)dmrC_combinations_[val - SPECIAL_BASE]);
return C->T->special_buffer;
}
const char *dmrC_show_ident(struct dmr_C *C, const struct ident *ident)
{
if (!ident)
return "<noident>";
sprintf(C->T->ident_buffer, "%.*s", ident->len, ident->name);
return C->T->ident_buffer;
}
static char *charstr(char *ptr, unsigned char c, unsigned char escape, unsigned char next)
{
if (isprint(c)) {
if (c == escape || c == '\\')
*ptr++ = '\\';
*ptr++ = c;
return ptr;
}
*ptr++ = '\\';
switch (c) {
case '\n':
*ptr++ = 'n';
return ptr;
case '\t':
*ptr++ = 't';
return ptr;
}
if (!isdigit(next))
return ptr + sprintf(ptr, "%o", c);
return ptr + sprintf(ptr, "%03o", c);
}
const char *dmrC_show_string(struct dmr_C *C, const struct string *string)
{
char *ptr;
int i;
if (!string->length)
return "<bad_string>";
ptr = C->T->string_buffer;
*ptr++ = '"';
for (i = 0; i < string->length - 1; i++) {
const char *p = string->data + i;
ptr = charstr(ptr, p[0], '"', p[1]);
}
*ptr++ = '"';
*ptr = '\0';
return C->T->string_buffer;
}
static const char *show_char(struct dmr_C *C, const char *s, size_t len, char prefix, char delim)
{
char *p = C->T->char_buffer;
if (prefix)
*p++ = prefix;
*p++ = delim;
memcpy(p, s, len);
p += len;
*p++ = delim;
*p++ = '\0';
return C->T->char_buffer;
}
static const char *quote_char(struct dmr_C *C, const char *s, size_t len, char prefix, char delim)
{
size_t i;
char *p = C->T->quote_buffer;
if (prefix)
*p++ = prefix;
if (delim == '"')
*p++ = '\\';
*p++ = delim;
for (i = 0; i < len; i++) {
if (s[i] == '"' || s[i] == '\\')
*p++ = '\\';
*p++ = s[i];
}
if (delim == '"')
*p++ = '\\';
*p++ = delim;
*p++ = '\0';
return C->T->quote_buffer;
}
const char *dmrC_show_token(struct dmr_C *C, const struct token *token)
{
if (!token)
return "<no token>";
switch (dmrC_token_type(token)) {
case TOKEN_ERROR:
return "syntax error";
case TOKEN_EOF:
return "end-of-input";
case TOKEN_IDENT:
return dmrC_show_ident(C, token->ident);
case TOKEN_NUMBER:
return token->number;
case TOKEN_SPECIAL:
return dmrC_show_special(C, token->special);
case TOKEN_CHAR:
return show_char(C, token->string->data,
token->string->length - 1, 0, '\'');
case TOKEN_CHAR_EMBEDDED_0:
case TOKEN_CHAR_EMBEDDED_1:
case TOKEN_CHAR_EMBEDDED_2:
case TOKEN_CHAR_EMBEDDED_3:
return show_char(C, token->embedded,
dmrC_token_type(token) - TOKEN_CHAR, 0, '\'');
case TOKEN_WIDE_CHAR:
return show_char(C, token->string->data,
token->string->length - 1, 'L', '\'');
case TOKEN_WIDE_CHAR_EMBEDDED_0:
case TOKEN_WIDE_CHAR_EMBEDDED_1:
case TOKEN_WIDE_CHAR_EMBEDDED_2:
case TOKEN_WIDE_CHAR_EMBEDDED_3:
return show_char(C, token->embedded,
dmrC_token_type(token) - TOKEN_WIDE_CHAR, 'L', '\'');
case TOKEN_STRING:
return show_char(C, token->string->data,
token->string->length - 1, 0, '"');
case TOKEN_WIDE_STRING:
return show_char(C, token->string->data,
token->string->length - 1, 'L', '"');
case TOKEN_STREAMBEGIN:
snprintf(C->T->token_buffer, sizeof C->T->token_buffer,
"<beginning of '%s'>",
dmrC_stream_name(C, token->pos.stream));
return C->T->token_buffer;
case TOKEN_STREAMEND:
snprintf(C->T->token_buffer, sizeof C->T->token_buffer,
"<end of '%s'>", dmrC_stream_name(C, token->pos.stream));
return C->T->token_buffer;
case TOKEN_UNTAINT:
snprintf(C->T->token_buffer, sizeof C->T->token_buffer,
"<untaint>");
return C->T->token_buffer;
case TOKEN_ARG_COUNT:
snprintf(C->T->token_buffer, sizeof C->T->token_buffer,
"<argcnt>");
return C->T->token_buffer;
default:
snprintf(C->T->token_buffer, sizeof C->T->token_buffer,
"unhandled token type '%d' ", dmrC_token_type(token));
return C->T->token_buffer;
}
}
const char *dmrC_quote_token(struct dmr_C *C, const struct token *token)
{
switch (dmrC_token_type(token)) {
case TOKEN_ERROR:
return "syntax error";
case TOKEN_IDENT:
return dmrC_show_ident(C, token->ident);
case TOKEN_NUMBER:
return token->number;
case TOKEN_SPECIAL:
return dmrC_show_special(C, token->special);
case TOKEN_CHAR:
return quote_char(C, token->string->data,
token->string->length - 1, 0, '\'');
case TOKEN_CHAR_EMBEDDED_0:
case TOKEN_CHAR_EMBEDDED_1:
case TOKEN_CHAR_EMBEDDED_2:
case TOKEN_CHAR_EMBEDDED_3:
return quote_char(C, token->embedded,
dmrC_token_type(token) - TOKEN_CHAR, 0, '\'');
case TOKEN_WIDE_CHAR:
return quote_char(C, token->string->data,
token->string->length - 1, 'L', '\'');
case TOKEN_WIDE_CHAR_EMBEDDED_0:
case TOKEN_WIDE_CHAR_EMBEDDED_1:
case TOKEN_WIDE_CHAR_EMBEDDED_2:
case TOKEN_WIDE_CHAR_EMBEDDED_3:
return quote_char(C, token->embedded,
dmrC_token_type(token) - TOKEN_WIDE_CHAR, 'L',
'\'');
case TOKEN_STRING:
return quote_char(C, token->string->data,
token->string->length - 1, 0, '"');
case TOKEN_WIDE_STRING:
return quote_char(C, token->string->data,
token->string->length - 1, 'L', '"');
default:
snprintf(C->T->quoted_token_buffer,
sizeof C->T->quoted_token_buffer,
"unhandled token type '%d' ", dmrC_token_type(token));
return C->T->quoted_token_buffer;
}
}
#define HASHED_INPUT_BITS (6)
#define HASHED_INPUT (1 << HASHED_INPUT_BITS)
#define HASH_PRIME 0x9e370001UL
#ifndef _MSC_VER
static int input_stream_hashes[HASHED_INPUT] = {[0 ... HASHED_INPUT - 1] = -1};
#else
static int input_stream_hashes[HASHED_INPUT] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1};
#endif
int *dmrC_hash_stream(const char *name)
{
uint32_t hash = 0;
unsigned char c;
while ((c = *name++) != 0)
hash = (hash + (c << 4) + (c >> 4)) * 11;
hash *= HASH_PRIME;
hash >>= 32 - HASHED_INPUT_BITS;
return input_stream_hashes + hash;
}
int dmrC_init_stream(struct dmr_C *C, const char *name, int fd, const char **next_path)
{
int stream = C->T->input_stream_nr, *hash;
struct stream *current;
if (stream >= C->T->input_streams_allocated) {
int newalloc = stream * 4 / 3 + 10;
C->T->input_streams = (struct stream *)realloc(C->T->input_streams, newalloc * sizeof(struct stream));
if (!C->T->input_streams)
dmrC_die(C, "Unable to allocate more streams space");
C->T->input_streams_allocated = newalloc;
}
current = C->T->input_streams + stream;
memset(current, 0, sizeof(*current));
current->name = name;
current->fd = fd;
current->next_path = next_path;
current->path = NULL;
current->constant = CONSTANT_FILE_MAYBE;
C->T->input_stream_nr = stream + 1;
hash = dmrC_hash_stream(name);
current->next_stream = *hash;
*hash = stream;
return stream;
}
static struct token *alloc_token(struct dmr_C *C, stream_t *stream)
{
struct token *token = (struct token *)dmrC_allocator_allocate(&C->token_allocator, 0);
token->pos = stream_pos(stream);
return token;
}
/*
* Argh... That was surprisingly messy - handling '\r' complicates the
* things a _lot_.
*/
static int nextchar_slow(struct dmr_C *C, stream_t *stream)
{
int offset = stream->offset;
int size = stream->size;
int c;
int spliced = 0, had_cr, had_backslash;
restart:
had_cr = had_backslash = 0;
repeat:
if (offset >= size) {
if (stream->fd < 0)
goto got_eof;
size = read(stream->fd, stream->buffer, BUFSIZE);
if (size <= 0)
goto got_eof;
stream->size = size;
stream->offset = offset = 0;
}
c = stream->buffer[offset++];
if (had_cr)
goto check_lf;
if (c == '\r') {
had_cr = 1;
goto repeat;
}
norm:
if (!had_backslash) {
switch (c) {
case '\t':
stream->pos += C->T->tabstop - stream->pos % C->T->tabstop;
break;
case '\n':
stream->line++;
stream->pos = 0;
stream->newline = 1;
break;
case '\\':
had_backslash = 1;
stream->pos++;
goto repeat;
default:
stream->pos++;
}
} else {
if (c == '\n') {
stream->line++;
stream->pos = 0;
spliced = 1;
goto restart;
}
offset--;
c = '\\';
}
out:
stream->offset = offset;
return c;
check_lf:
if (c != '\n')
offset--;
c = '\n';
goto norm;
got_eof:
if (had_backslash) {
c = '\\';
goto out;
}
if (stream->pos)
dmrC_warning(C, stream_pos(stream), "no newline at end of file");
else if (spliced)
dmrC_warning(C, stream_pos(stream), "backslash-newline at end of file");
return EOF;
}
/*
* We want that as light as possible while covering all normal cases.
* Slow path (including the logics with line-splicing and EOF sanity
* checks) is in nextchar_slow().
*/
static inline int nextchar(struct dmr_C *C, stream_t *stream)
{
int offset = stream->offset;
if (offset < stream->size) {
int c = stream->buffer[offset++];
if (!C->T->special[c]) {
stream->offset = offset;
stream->pos++;
return c;
}
}
return nextchar_slow(C, stream);
}
struct token dmrC_eof_token_entry_;
static struct token *mark_eof(struct dmr_C *C, stream_t *stream)
{
struct token *end;
end = alloc_token(C, stream);
dmrC_token_type(end) = TOKEN_STREAMEND;
end->pos.newline = 1;
dmrC_eof_token_entry_.next = &dmrC_eof_token_entry_;
dmrC_eof_token_entry_.pos.newline = 1;
end->next = &dmrC_eof_token_entry_;
*stream->tokenlist = end;
stream->tokenlist = NULL;
return end;
}
static void add_token(stream_t *stream)
{
struct token *token = stream->token;
stream->token = NULL;
token->next = NULL;
*stream->tokenlist = token;
stream->tokenlist = &token->next;
}
static void drop_token(stream_t *stream)
{
stream->newline |= stream->token->pos.newline;
stream->whitespace |= stream->token->pos.whitespace;
stream->token = NULL;
}
enum {
Letter = 1,
Digit = 2,
Hex = 4,
Exp = 8,
Dot = 16,
ValidSecond = 32,
Quote = 64,
};
/*
* pp-number:
* digit
* . digit
* pp-number digit
* pp-number identifier-nodigit
* pp-number e sign
* pp-number E sign
* pp-number p sign
* pp-number P sign
* pp-number .
*/
static int get_one_number(struct dmr_C *C, int c, int next, stream_t *stream)
{
struct token *token;
char *buffer = C->T->number_buffer;
char *p = buffer, *buf, *buffer_end = buffer + sizeof C->T->number_buffer;
size_t len;
*p++ = c;
for (;;) {
long kclass = C->T->cclass[next + 1];
if (!(kclass & (Dot | Digit | Letter)))
break;
if (p != buffer_end)
*p++ = next;
next = nextchar(C, stream);
if (kclass & Exp) {
if (next == '-' || next == '+') {
if (p != buffer_end)
*p++ = next;
next = nextchar(C, stream);
}
}
}
if (p == buffer_end) {
dmrC_sparse_error(C, stream_pos(stream),
"number token exceeds %td characters",
buffer_end - buffer);
// Pretend we saw just "1".
buffer[0] = '1';
p = buffer + 1;
}
*p++ = 0;
len = p - buffer;
buf = (char *)dmrC_allocator_allocate(&C->byte_allocator, len);
memcpy(buf, buffer, len);
token = stream->token;
dmrC_token_type(token) = TOKEN_NUMBER;
token->number = buf;
add_token(stream);
return next;
}
static int eat_string(struct dmr_C *C, int next, stream_t *stream,
enum e_token_type type)
{
char *buffer = C->T->string_buffer2;
struct string *string;
struct token *token = stream->token;
int len = 0;
int escape;
int want_hex = 0;
char delim = type < TOKEN_STRING ? '\'' : '"';
for (escape = 0; escape || next != delim; next = nextchar(C, stream)) {
if (len < MAX_STRING)
buffer[len] = next;
len++;
if (next == '\n') {
dmrC_warning(C, stream_pos(stream),
"Newline in string or character constant");
if (delim == '\'') /* assume it's lost ' */
break;
}
if (next == EOF) {
dmrC_warning(C, stream_pos(stream),
"End of file in middle of string");
return next;
}
if (!escape) {
if (want_hex && !(C->T->cclass[next + 1] & Hex))
dmrC_warning(
C, stream_pos(stream),
"\\x used with no following hex digits");
want_hex = 0;
escape = next == '\\';
} else {
escape = 0;
want_hex = next == 'x';
}
}
if (want_hex)
dmrC_warning(C, stream_pos(stream),
"\\x used with no following hex digits");
if (len > MAX_STRING) {
dmrC_warning(C, stream_pos(stream),
"string too long (%d bytes, %d bytes max)", len, MAX_STRING);
len = MAX_STRING;
}
if (delim == '\'' && len <= 4) {
if (len == 0) {
dmrC_sparse_error(C, stream_pos(stream),
"empty character constant");
return nextchar(C, stream);
}
dmrC_token_type(token) = type + len;
memset(buffer + len, '\0', 4 - len);
memcpy(token->embedded, buffer, 4);
} else {
dmrC_token_type(token) = type;
string = (struct string *)dmrC_allocator_allocate(&C->string_allocator, len + 1);
memcpy(string->data, buffer, len);
string->data[len] = '\0';
string->length = len + 1;
token->string = string;
}
/* Pass it on.. */
token = stream->token;
add_token(stream);
return nextchar(C, stream);
}
static int drop_stream_eoln(struct dmr_C *C, stream_t *stream)
{
drop_token(stream);
for (;;) {
switch (nextchar(C, stream)) {
case EOF:
return EOF;
case '\n':
return nextchar(C, stream);
}
}
}
static int drop_stream_comment(struct dmr_C *C, stream_t *stream)
{
int newline;
int next;
drop_token(stream);
newline = stream->newline;
next = nextchar(C, stream);
for (;;) {
int curr = next;
if (curr == EOF) {
dmrC_warning(C, stream_pos(stream),
"End of file in the middle of a comment");
return curr;
}
next = nextchar(C, stream);
if (curr == '*' && next == '/')
break;
}
stream->newline = newline;
return nextchar(C, stream);
}
unsigned char dmrC_combinations_[][4] = COMBINATION_STRINGS;
#define NR_COMBINATIONS (SPECIAL_ARG_SEPARATOR - SPECIAL_BASE)
/* hash function for two-character punctuators - all give unique values */
#define special_hash(c0, c1) (((c0*8+c1*2)+((c0*8+c1*2)>>5))&31)
static int get_one_special(struct dmr_C *C, int c, stream_t *stream)
{
struct token *token;
int next, value, i;
next = nextchar(C, stream);
/*
* Check for numbers, strings, character constants, and comments
*/
switch (c) {
case '.':
if (next >= '0' && next <= '9')
return get_one_number(C, c, next, stream);
break;
case '"':
return eat_string(C, next, stream, TOKEN_STRING);
case '\'':
return eat_string(C, next, stream, TOKEN_CHAR);
case '/':
if (next == '/')
return drop_stream_eoln(C, stream);
if (next == '*')
return drop_stream_comment(C, stream);
}
/*
* Check for combinations
*/
value = c;
if (C->T->cclass[next + 1] & ValidSecond) {
i = special_hash(c, next);
if (C->T->hash_results[i][0] == c && C->T->hash_results[i][1] == next) {
value = C->T->code[i];
next = nextchar(C, stream);
if (value >= SPECIAL_LEFTSHIFT &&
next == "==."[value - SPECIAL_LEFTSHIFT]) {
value += 3;
next = nextchar(C, stream);
}
}
}
/* Pass it on.. */
token = stream->token;
dmrC_token_type(token) = TOKEN_SPECIAL;
token->special = value;
add_token(stream);
return next;
}
#define IDENT_HASH_BITS (13)
#define IDENT_HASH_SIZE (1<<IDENT_HASH_BITS)
#define IDENT_HASH_MASK (IDENT_HASH_SIZE-1)
#define ident_hash_init(c) (c)
#define ident_hash_add(oldhash,c) ((oldhash)*11 + (c))
#define ident_hash_end(hash) ((((hash) >> IDENT_HASH_BITS) + (hash)) & IDENT_HASH_MASK)
void dmrC_show_identifier_stats(struct dmr_C *C)
{
int i;
int distribution[100];
fprintf(stderr, "identifiers: %d hits, %d misses\n",
C->T->ident_hit, C->T->ident_miss);
for (i = 0; i < 100; i++)
distribution[i] = 0;
for (i = 0; i < IDENT_HASH_SIZE; i++) {
struct ident *ident = C->T->hash_table[i];
int count = 0;
while (ident) {
count++;
ident = ident->next;
}
if (count > 99)
count = 99;
distribution[count]++;
}
for (i = 0; i < 100; i++) {
if (distribution[i])
fprintf(stderr, "%2d: %d buckets\n", i,
distribution[i]);
}
}
static struct ident *alloc_ident(struct dmr_C *C, const char *name, size_t len)
{
struct ident *ident = (struct ident *)dmrC_allocator_allocate(&C->ident_allocator, len);
ident->symbols = NULL;
assert(len <= 256);
ident->len = (unsigned char)len;
ident->tainted = 0;
memcpy(ident->name, name, len);
return ident;
}
static struct ident *insert_hash(struct dmr_C *C, struct ident *ident,
unsigned long hash)
{
ident->next = C->T->hash_table[hash];
C->T->hash_table[hash] = ident;
C->T->ident_miss++;
return ident;
}
static struct ident *create_hashed_ident(struct dmr_C *C, const char *name,
size_t len, unsigned long hash)
{
struct ident *ident;
struct ident **p;
p = &C->T->hash_table[hash];
while ((ident = *p) != NULL) {
if (ident->len == (unsigned char) len) {
if (strncmp(name, ident->name, len) != 0)
goto next;
C->T->ident_hit++;
return ident;
}
next:
//misses++;
p = &ident->next;
}
ident = alloc_ident(C, name, len);
*p = ident;
ident->next = NULL;
C->T->ident_miss++;
C->T->idents++;
return ident;
}
static unsigned long hash_name(const char *name, int len)
{
unsigned long hash;
const unsigned char *p = (const unsigned char *)name;
hash = ident_hash_init(*p++);
while (--len) {
unsigned int i = *p++;
hash = ident_hash_add(hash, i);
}
return ident_hash_end(hash);
}
struct ident *dmrC_hash_ident(struct dmr_C *C, struct ident *ident)
{
return insert_hash(C, ident, hash_name(ident->name, (int)ident->len));
}
struct ident *dmrC_built_in_ident(struct dmr_C *C, const char *name)
{
size_t len = strlen(name);
return create_hashed_ident(C, name, len, hash_name(name, (int)len));
}
struct token *dmrC_built_in_token(struct dmr_C *C, int stream, struct ident *ident)
{
struct token *token;
token = (struct token *)dmrC_allocator_allocate(&C->token_allocator, 0);
token->pos.stream = stream;
dmrC_token_type(token) = TOKEN_IDENT;
token->ident = ident;
return token;
}
static int get_one_identifier(struct dmr_C *C, int c, stream_t *stream)
{
struct token *token;
struct ident *ident;
unsigned long hash;
char buf[256];
int len = 1;
int next;
hash = ident_hash_init(c);
buf[0] = c;
for (;;) {
next = nextchar(C, stream);
if (!(C->T->cclass[next + 1] & (Letter | Digit)))
break;
if (len >= (int)sizeof(buf))
break;
hash = ident_hash_add(hash, next);
buf[len] = next;
len++;
};
if (C->T->cclass[next + 1] & Quote) {
if (len == 1 && buf[0] == 'L') {
if (next == '\'')
return eat_string(C, nextchar(C, stream),
stream, TOKEN_WIDE_CHAR);
else
return eat_string(C, nextchar(C, stream),
stream, TOKEN_WIDE_STRING);
}
}
hash = ident_hash_end(hash);
ident = create_hashed_ident(C, buf, len, hash);
/* Pass it on.. */
token = stream->token;
dmrC_token_type(token) = TOKEN_IDENT;
token->ident = ident;
add_token(stream);
return next;
}
static int get_one_token(struct dmr_C *C, int c, stream_t *stream)
{
long kclass = C->T->cclass[c + 1];
if (kclass & Digit)
return get_one_number(C, c, nextchar(C, stream), stream);
if (kclass & Letter)
return get_one_identifier(C, c, stream);
return get_one_special(C, c, stream);
}
static struct token *setup_stream(struct dmr_C *C, stream_t *stream,
int idx, int fd, unsigned char *buf,
unsigned int buf_size)
{
struct token *begin;
stream->nr = idx;
stream->line = 1;
stream->newline = 1;
stream->whitespace = 0;
stream->pos = 0;
stream->token = NULL;
stream->fd = fd;
stream->offset = 0;
stream->size = buf_size;
stream->buffer = buf;
begin = alloc_token(C, stream);
dmrC_token_type(begin) = TOKEN_STREAMBEGIN;
stream->tokenlist = &begin->next;
return begin;
}
static struct token *tokenize_stream(struct dmr_C *C, stream_t *stream)
{
int c = nextchar(C, stream);
while (c != EOF) {
if (!isspace(c)) {
struct token *token = alloc_token(C, stream);
stream->token = token;
stream->newline = 0;
stream->whitespace = 0;
c = get_one_token(C, c, stream);
continue;
}
stream->whitespace = 1;
c = nextchar(C, stream);
}
return mark_eof(C, stream);
}
struct token *dmrC_tokenize_buffer(struct dmr_C *C, unsigned char *buffer,
unsigned long size, struct token **endtoken)
{
stream_t stream;
struct token *begin;
begin = setup_stream(C, &stream, 0, -1, buffer, size);
*endtoken = tokenize_stream(C, &stream);
return begin;
}
struct token *dmrC_tokenize_buffer_stream(struct dmr_C *C, const char *name,
unsigned char *buffer,
unsigned long size,
struct token **endtoken)
{
stream_t stream;
struct token *begin;
int idx;
idx = dmrC_init_stream(C, name, -1, C->includepath);
if (idx < 0) {
return NULL;
}
begin = setup_stream(C, &stream, idx, -1, buffer, size);
*endtoken = tokenize_stream(C, &stream);
return begin;
}
struct token *dmrC_tokenize(struct dmr_C *C, const char *name, int fd,
struct token *endtoken, const char **next_path)
{
struct token *begin, *end;
stream_t stream;
unsigned char buffer[BUFSIZE];
int idx;
idx = dmrC_init_stream(C, name, fd, next_path);
if (idx < 0) {
// dmrC_info(endtoken->pos, "File %s is const", name);
return endtoken;
}
begin = setup_stream(C, &stream, idx, fd, buffer, 0);
end = tokenize_stream(C, &stream);
if (endtoken)
end->next = endtoken;
return begin;
}
void dmrC_init_tokenizer(struct dmr_C *C)
{
C->T = (struct tokenizer_state_t *)calloc(
1, sizeof(struct tokenizer_state_t));
C->T->tabstop = 8;
C->T->special['\t'] = 1;
C->T->special['\r'] = 1;
C->T->special['\n'] = 1;
C->T->special['\\'] = 1;
C->T->cclass['0' + 1] = Digit | Hex; /* \<octal> */
C->T->cclass['1' + 1] = Digit | Hex; /* \<octal> */
C->T->cclass['2' + 1] = Digit | Hex; /* \<octal> */
C->T->cclass['3' + 1] = Digit | Hex; /* \<octal> */
C->T->cclass['4' + 1] = Digit | Hex; /* \<octal> */
C->T->cclass['5' + 1] = Digit | Hex; /* \<octal> */
C->T->cclass['6' + 1] = Digit | Hex; /* \<octal> */
C->T->cclass['7' + 1] = Digit | Hex; /* \<octal> */
C->T->cclass['8' + 1] = Digit | Hex;
C->T->cclass['9' + 1] = Digit | Hex;
C->T->cclass['A' + 1] = Letter | Hex;
C->T->cclass['B' + 1] = Letter | Hex;
C->T->cclass['C' + 1] = Letter | Hex;
C->T->cclass['D' + 1] = Letter | Hex;
C->T->cclass['E' + 1] = Letter | Hex | Exp; /* E<exp> */
C->T->cclass['F' + 1] = Letter | Hex;
C->T->cclass['G' + 1] = Letter;
C->T->cclass['H' + 1] = Letter;
C->T->cclass['I' + 1] = Letter;
C->T->cclass['J' + 1] = Letter;
C->T->cclass['K' + 1] = Letter;
C->T->cclass['L' + 1] = Letter;
C->T->cclass['M' + 1] = Letter;
C->T->cclass['N' + 1] = Letter;
C->T->cclass['O' + 1] = Letter;
C->T->cclass['P' + 1] = Letter | Exp; /* P<exp> */
C->T->cclass['Q' + 1] = Letter;
C->T->cclass['R' + 1] = Letter;
C->T->cclass['S' + 1] = Letter;
C->T->cclass['T' + 1] = Letter;
C->T->cclass['U' + 1] = Letter;
C->T->cclass['V' + 1] = Letter;
C->T->cclass['W' + 1] = Letter;
C->T->cclass['X' + 1] = Letter;
C->T->cclass['Y' + 1] = Letter;
C->T->cclass['Z' + 1] = Letter;
C->T->cclass['a' + 1] = Letter | Hex; /* \a, \b */
C->T->cclass['b' + 1] = Letter | Hex; /* \a, \b */
C->T->cclass['c' + 1] = Letter | Hex;
C->T->cclass['d' + 1] = Letter | Hex;
C->T->cclass['e' + 1] = Letter | Hex | Exp; /* \e, e<exp> */
C->T->cclass['f' + 1] = Letter | Hex; /* \f */
C->T->cclass['g' + 1] = Letter;
C->T->cclass['h' + 1] = Letter;
C->T->cclass['i' + 1] = Letter;
C->T->cclass['j' + 1] = Letter;
C->T->cclass['k' + 1] = Letter;
C->T->cclass['l' + 1] = Letter;
C->T->cclass['m' + 1] = Letter;
C->T->cclass['n' + 1] = Letter; /* \n */
C->T->cclass['o' + 1] = Letter;
C->T->cclass['p' + 1] = Letter | Exp; /* p<exp> */
C->T->cclass['q' + 1] = Letter;
C->T->cclass['r' + 1] = Letter; /* \r */
C->T->cclass['s' + 1] = Letter;
C->T->cclass['t' + 1] = Letter; /* \t */
C->T->cclass['u' + 1] = Letter;
C->T->cclass['v' + 1] = Letter; /* \v */
C->T->cclass['w' + 1] = Letter;
C->T->cclass['x' + 1] = Letter; /* \x<hex> */
C->T->cclass['y' + 1] = Letter;
C->T->cclass['z' + 1] = Letter;
C->T->cclass['_' + 1] = Letter;
C->T->cclass['.' + 1] = Dot | ValidSecond;
C->T->cclass['=' + 1] = ValidSecond;
C->T->cclass['+' + 1] = ValidSecond;
C->T->cclass['-' + 1] = ValidSecond;
C->T->cclass['>' + 1] = ValidSecond;
C->T->cclass['<' + 1] = ValidSecond;
C->T->cclass['&' + 1] = ValidSecond;
C->T->cclass['|' + 1] = ValidSecond;
C->T->cclass['#' + 1] = ValidSecond;
C->T->cclass['\'' + 1] = Quote;
C->T->cclass['"' + 1] = Quote;
/*
* note that we won't get false positives - special_hash(0,0) is 0 and
* entry 0 is filled (by +=), so all the missing ones are OK.
*/
#define RES(c0, c1) \
C->T->hash_results[special_hash(c0, c1)][0] = c0, \
C->T->hash_results[special_hash(c0, c1)][1] = c1
RES('+', '='); /* 00 */
RES('/', '='); /* 01 */
RES('^', '='); /* 05 */
RES('&', '&'); /* 07 */
RES('#', '#'); /* 08 */
RES('<', '<'); /* 0a */
RES('<', '='); /* 0c */
RES('!', '='); /* 0e */
RES('%', '='); /* 0f */
RES('-', '-'); /* 10 */
RES('-', '='); /* 11 */
RES('-', '>'); /* 13 */
RES('=', '='); /* 15 */
RES('&', '='); /* 17 */
RES('*', '='); /* 18 */
RES('.', '.'); /* 1a */
RES('+', '+'); /* 1b */
RES('|', '='); /* 1c */
RES('>', '='); /* 1d */
RES('|', '|'); /* 1e */
RES('>', '>'); /* 1f */
#undef RES
#define CODE(c0, c1, value) C->T->code[special_hash(c0, c1)] = value
CODE('+', '=', SPECIAL_ADD_ASSIGN); /* 00 */
CODE('/', '=', SPECIAL_DIV_ASSIGN); /* 01 */
CODE('^', '=', SPECIAL_XOR_ASSIGN); /* 05 */
CODE('&', '&', SPECIAL_LOGICAL_AND); /* 07 */
CODE('#', '#', SPECIAL_HASHHASH); /* 08 */
CODE('<', '<', SPECIAL_LEFTSHIFT); /* 0a */
CODE('<', '=', SPECIAL_LTE); /* 0c */
CODE('!', '=', SPECIAL_NOTEQUAL); /* 0e */
CODE('%', '=', SPECIAL_MOD_ASSIGN); /* 0f */
CODE('-', '-', SPECIAL_DECREMENT); /* 10 */
CODE('-', '=', SPECIAL_SUB_ASSIGN); /* 11 */
CODE('-', '>', SPECIAL_DEREFERENCE); /* 13 */
CODE('=', '=', SPECIAL_EQUAL); /* 15 */
CODE('&', '=', SPECIAL_AND_ASSIGN); /* 17 */
CODE('*', '=', SPECIAL_MUL_ASSIGN); /* 18 */
CODE('.', '.', SPECIAL_DOTDOT); /* 1a */
CODE('+', '+', SPECIAL_INCREMENT); /* 1b */
CODE('|', '=', SPECIAL_OR_ASSIGN); /* 1c */
CODE('>', '=', SPECIAL_GTE); /* 1d */
CODE('|', '|', SPECIAL_LOGICAL_OR); /* 1e */
CODE('>', '>', SPECIAL_RIGHTSHIFT); /* 1f */
#undef CODE
C->T->hash_table =
(struct ident **)calloc(IDENT_HASH_SIZE, sizeof(struct ident *));
}
void dmrC_destroy_tokenizer(struct dmr_C *C)
{
free(C->T->input_streams);
free(C->T->hash_table);
free(C->T);
C->T = NULL;
}
int dmrC_test_tokenizer()
{
struct dmr_C *C = new_dmr_C();
char test1[100] =
"int main() { printf(\"hello world!\\n\"); return 0; }";
const char *expected[] = {"<beginning of 'builtin'>",
"int",
"main",
"(",
")",
"{",
"printf",
"(",
"\"hello world!\\n\"",
")",
";",
"return",
"0",
";",
"}",
NULL};
struct token *start;
struct token *end;
start = dmrC_tokenize_buffer(C, (unsigned char *)test1,
(unsigned long)strlen(test1), &end);
int i = 0;
int failure_count = 0;
for (struct token *p = start; p != end; p = p->next) {
if (expected[i] == NULL) {
failure_count++;
break;
}
if (strcmp(dmrC_show_token(C, p), expected[i]) != 0) {
fprintf(stderr, "Expected '%s' got '%s'\n", expected[i],
dmrC_show_token(C, p));
failure_count++;
break;
}
i++;
}
destroy_dmr_C(C);
if (failure_count == 0) {
printf("tokenizer hello world test okay\n");
}
return failure_count;
}
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