static int c;
token_t lexer_token;
+symbol_t *symbol_L;
static FILE *input;
static char buf[1024 + MAX_PUTBACK];
static const char *bufend;
static const char *bufpos;
static strset_t stringset;
-//static FILE **input_stack;
-//static char **buf_stack;
static void error_prefix_at(const char *input_name, unsigned linenr)
{
static inline void put_back(int pc)
{
- char *p = (char*) bufpos - 1;
- bufpos--;
- assert(p >= buf);
+ assert(bufpos >= buf);
+ assert(bufpos < buf+MAX_PUTBACK || *bufpos == pc);
+
+ char *p = buf + (bufpos - buf);
*p = pc;
+ /* going backwards in the buffer is legal as long as it's not more often
+ * than MAX_PUTBACK */
+ bufpos--;
+
#ifdef DEBUG_CHARS
printf("putback '%c'\n", pc);
#endif
lexer_token.source_position.linenr++; \
code;
+#define eat(c_type) do { assert(c == c_type); next_char(); } while(0)
+
static void maybe_concat_lines(void)
{
- next_char();
+ eat('\\');
+
switch(c) {
MATCH_NEWLINE(return;)
{
next_real_char();
+#if 0
/* filter trigraphs */
if(UNLIKELY(c == '\\')) {
maybe_concat_lines();
}
end_of_next_char:
+#endif
+ (void) maybe_concat_lines;
#ifdef DEBUG_CHARS
printf("nchar '%c'\n", c);
#else
}
}
+static void parse_floating_suffix(void)
+{
+ switch(c) {
+ /* TODO: do something usefull with the suffixes... */
+ case 'f':
+ case 'F':
+ case 'l':
+ case 'L':
+ next_char();
+ break;
+ default:
+ break;
+ }
+}
+
static void parse_number_hex(void)
{
assert(c == 'x' || c == 'X');
lexer_token.type = T_FLOATINGPOINT;
lexer_token.v.floatvalue = value;
+
+ parse_floating_suffix();
}
static void parse_floatingpoint_fract(int integer_part)
lexer_token.type = T_FLOATINGPOINT;
lexer_token.v.floatvalue = value;
+
+ parse_floating_suffix();
}
static void parse_number_dec(void)
static int parse_escape_sequence(void)
{
- while(1) {
- int ec = c;
- next_char();
+ eat('\\');
- switch(ec) {
- case '"': return '"';
- case '\'': return'\'';
- case '\\': return '\\';
- case '?': return '\?';
- case 'a': return '\a';
- case 'b': return '\b';
- case 'f': return '\f';
- case 'n': return '\n';
- case 'r': return '\r';
- case 't': return '\t';
- case 'v': return '\v';
- case 'x':
- return parse_hex_sequence();
- case '0':
- case '1':
- case '2':
- case '3':
- case '4':
- case '5':
- case '6':
- case '7':
- return parse_octal_sequence();
- case EOF:
- parse_error("reached end of file while parsing escape sequence");
- return EOF;
- default:
- parse_error("unknown escape sequence");
- return EOF;
- }
+ int ec = c;
+ next_char();
+
+ switch(ec) {
+ case '"': return '"';
+ case '\'': return'\'';
+ case '\\': return '\\';
+ case '?': return '\?';
+ case 'a': return '\a';
+ case 'b': return '\b';
+ case 'f': return '\f';
+ case 'n': return '\n';
+ case 'r': return '\r';
+ case 't': return '\t';
+ case 'v': return '\v';
+ case 'x':
+ return parse_hex_sequence();
+ case '0':
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7':
+ return parse_octal_sequence();
+ case EOF:
+ parse_error("reached end of file while parsing escape sequence");
+ return EOF;
+ default:
+ parse_error("unknown escape sequence");
+ return EOF;
}
}
assert(c == '"');
next_char();
+ int tc;
while(1) {
switch(c) {
case '\\':
- next_char();
- int ec = parse_escape_sequence();
- obstack_1grow(&symbol_obstack, ec);
+ tc = parse_escape_sequence();
+ obstack_1grow(&symbol_obstack, tc);
break;
case EOF:
static void parse_character_constant(void)
{
- assert(c == '\'');
- next_char();
+ eat('\'');
int found_char = 0;
while(1) {
switch(c) {
case '\\':
- next_char();
found_char = parse_escape_sequence();
break;
}
}
-static void parse_preprocessor_directive()
+static void parse_preprocessor_directive(void)
{
next_pp_token();
SYMBOL_CHARS
parse_symbol();
+ /* might be a wide string ( L"string" ) */
+ if(c == '"' && (lexer_token.type == T_IDENTIFIER &&
+ lexer_token.v.symbol == symbol_L)) {
+ parse_string_literal();
+ return;
+ }
return;
DIGITS
void lexer_open_stream(FILE *stream, const char *input_name)
{
input = stream;
- lexer_token.source_position.linenr = 1;
+ lexer_token.source_position.linenr = 0;
lexer_token.source_position.input_name = input_name;
- next_char();
+ symbol_L = symbol_table_insert("L");
+
+ /* place a virtual \n at the beginning so the lexer knows that we're
+ * at the beginning of a line */
+ c = '\n';
}
void exit_lexer(void)