#include "adt/error.h"
#include "adt/strset.h"
#include "adt/util.h"
+#include "type_t.h"
#include <assert.h>
#include <errno.h>
#include <string.h>
+#include <stdbool.h>
#include <ctype.h>
-#define DEBUG_CHARS
+//#define DEBUG_CHARS
#define MAX_PUTBACK 3
+#ifdef _WIN32
+/* No strtold on windows and no replacement yet */
+#define strtold(s, e) strtod(s, e)
+#endif
+
+#define HAS_SIGNED_CHAR
+//#define HAS_UNSIGNED_CHAR
+
+#if defined HAS_SIGNED_CHAR
+typedef signed char char_type;
+#elif defined HAS_UNSIGNED_CHAR
+typedef unsigned char char_type;
+#else
+# error signedness of char not determined
+#endif
+
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 type_t *type_int = NULL;
+static type_t *type_uint = NULL;
+static type_t *type_long = NULL;
+static type_t *type_ulong = NULL;
+static type_t *type_longlong = NULL;
+static type_t *type_ulonglong = NULL;
+static type_t *type_float = NULL;
+static type_t *type_double = NULL;
+static type_t *type_longdouble = NULL;
+
static void error_prefix_at(const char *input_name, unsigned linenr)
{
fprintf(stderr, "%s:%u: Error: ", input_name, 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;
-static inline void eat(char c_type)
-{
- assert(c == c_type);
- next_char();
-}
+#define eat(c_type) do { assert(c == c_type); next_char(); } while(0)
static void maybe_concat_lines(void)
{
break;
}
-end_of_next_char:
+end_of_next_char:;
#ifdef DEBUG_CHARS
printf("nchar '%c'\n", c);
-#else
- ;
#endif
}
static void parse_integer_suffix(void)
{
- if(c == 'U' || c == 'U') {
- /* TODO do something with the suffixes... */
+ if(c == 'U' || c == 'u') {
next_char();
if(c == 'L' || c == 'l') {
next_char();
if(c == 'L' || c == 'l') {
next_char();
+ lexer_token.datatype = type_ulonglong;
+ } else {
+ lexer_token.datatype = type_ulong;
}
+ } else {
+ lexer_token.datatype = type_uint;
}
} else if(c == 'l' || c == 'L') {
next_char();
next_char();
if(c == 'u' || c == 'U') {
next_char();
+ lexer_token.datatype = type_ulonglong;
+ } else {
+ lexer_token.datatype = type_longlong;
}
} else if(c == 'u' || c == 'U') {
next_char();
+ lexer_token.datatype = type_ulong;
+ } else {
+ lexer_token.datatype = type_int;
}
+ } else {
+ lexer_token.datatype = type_int;
}
}
-static void parse_number_hex(void)
+static void parse_floating_suffix(void)
{
- assert(c == 'x' || c == 'X');
- next_char();
+ switch(c) {
+ /* TODO: do something usefull with the suffixes... */
+ case 'f':
+ case 'F':
+ next_char();
+ lexer_token.datatype = type_float;
+ break;
+ case 'l':
+ case 'L':
+ next_char();
+ lexer_token.datatype = type_longdouble;
+ break;
+ default:
+ lexer_token.datatype = type_double;
+ break;
+ }
+}
- if (!isdigit(c) &&
- !('A' <= c && c <= 'F') &&
- !('a' <= c && c <= 'f')) {
- parse_error("premature end of hex number literal");
- lexer_token.type = T_ERROR;
- return;
+/**
+ * A replacement for strtoull. Only those parts needed for
+ * our parser are implemented.
+ */
+static unsigned long long parse_int_string(const char *s, const char **endptr, int base) {
+ unsigned long long v = 0;
+
+ switch (base) {
+ case 16:
+ for (;; ++s) {
+ /* check for overrun */
+ if (v >= 0x1000000000000000ULL)
+ break;
+ switch (tolower(*s)) {
+ case '0': v <<= 4; break;
+ case '1': v <<= 4; v |= 0x1; break;
+ case '2': v <<= 4; v |= 0x2; break;
+ case '3': v <<= 4; v |= 0x3; break;
+ case '4': v <<= 4; v |= 0x4; break;
+ case '5': v <<= 4; v |= 0x5; break;
+ case '6': v <<= 4; v |= 0x6; break;
+ case '7': v <<= 4; v |= 0x7; break;
+ case '8': v <<= 4; v |= 0x8; break;
+ case '9': v <<= 4; v |= 0x9; break;
+ case 'a': v <<= 4; v |= 0xa; break;
+ case 'b': v <<= 4; v |= 0xb; break;
+ case 'c': v <<= 4; v |= 0xc; break;
+ case 'd': v <<= 4; v |= 0xd; break;
+ case 'e': v <<= 4; v |= 0xe; break;
+ case 'f': v <<= 4; v |= 0xf; break;
+ default:
+ goto end;
+ }
+ }
+ break;
+ case 8:
+ for (;; ++s) {
+ /* check for overrun */
+ if (v >= 0x2000000000000000ULL)
+ break;
+ switch (tolower(*s)) {
+ case '0': v <<= 3; break;
+ case '1': v <<= 3; v |= 1; break;
+ case '2': v <<= 3; v |= 2; break;
+ case '3': v <<= 3; v |= 3; break;
+ case '4': v <<= 3; v |= 4; break;
+ case '5': v <<= 3; v |= 5; break;
+ case '6': v <<= 3; v |= 6; break;
+ case '7': v <<= 3; v |= 7; break;
+ default:
+ goto end;
+ }
+ }
+ break;
+ case 10:
+ for (;; ++s) {
+ /* check for overrun */
+ if (v > 0x1999999999999999ULL)
+ break;
+ switch (tolower(*s)) {
+ case '0': v *= 10; break;
+ case '1': v *= 10; v += 1; break;
+ case '2': v *= 10; v += 2; break;
+ case '3': v *= 10; v += 3; break;
+ case '4': v *= 10; v += 4; break;
+ case '5': v *= 10; v += 5; break;
+ case '6': v *= 10; v += 6; break;
+ case '7': v *= 10; v += 7; break;
+ case '8': v *= 10; v += 8; break;
+ case '9': v *= 10; v += 9; break;
+ default:
+ goto end;
+ }
+ }
+ break;
+ default:
+ assert(0);
+ break;
}
+end:
+ *endptr = s;
+ return v;
+}
- int value = 0;
- while(1) {
- if (isdigit(c)) {
- value = 16 * value + c - '0';
- } else if ('A' <= c && c <= 'F') {
- value = 16 * value + c - 'A' + 10;
- } else if ('a' <= c && c <= 'f') {
- value = 16 * value + c - 'a' + 10;
- } else {
- parse_integer_suffix();
+static void parse_number_hex(void)
+{
+ assert(c == 'x' || c == 'X');
+ next_char();
- lexer_token.type = T_INTEGER;
- lexer_token.v.intvalue = value;
- return;
- }
+ while(isxdigit(c)) {
+ obstack_1grow(&symbol_obstack, c);
next_char();
}
+ obstack_1grow(&symbol_obstack, '\0');
+ char *string = obstack_finish(&symbol_obstack);
if(c == '.' || c == 'p' || c == 'P') {
next_char();
panic("Hex floating point numbers not implemented yet");
}
-}
-
-static void parse_number_oct(void)
-{
- int value = 0;
- while(c >= '0' && c <= '7') {
- value = 8 * value + c - '0';
- next_char();
- }
- if (c == '8' || c == '9') {
- parse_error("invalid octal number");
+ if(*string == '\0') {
+ parse_error("invalid hex number");
lexer_token.type = T_ERROR;
- return;
}
+ const char *endptr;
lexer_token.type = T_INTEGER;
- lexer_token.v.intvalue = value;
+ lexer_token.v.intvalue = parse_int_string(string, &endptr, 16);
+ if(*endptr != '\0') {
+ parse_error("hex number literal too long");
+ }
+ obstack_free(&symbol_obstack, string);
parse_integer_suffix();
}
-static void parse_floatingpoint_exponent(long double value)
+static inline bool is_octal_digit(int chr)
{
- unsigned int expo = 0;
- long double factor = 10.;
-
- if(c == '-') {
- next_char();
- factor = 0.1;
- } else if(c == '+') {
- next_char();
- }
-
- while(c >= '0' && c <= '9') {
- expo = 10 * expo + (c - '0');
- next_char();
- }
-
- while(1) {
- if(expo & 1)
- value *= factor;
- expo >>= 1;
- if(expo == 0)
- break;
- factor *= factor;
- }
-
- lexer_token.type = T_FLOATINGPOINT;
- lexer_token.v.floatvalue = value;
+ return '0' <= chr && chr <= '7';
}
-static void parse_floatingpoint_fract(int integer_part)
+static void parse_number_oct(void)
{
- long double value = integer_part;
- long double factor = 1.;
-
- while(c >= '0' && c <= '9') {
- factor *= 0.1;
- value += (c - '0') * factor;
+ while(is_octal_digit(c)) {
+ obstack_1grow(&symbol_obstack, c);
next_char();
}
+ obstack_1grow(&symbol_obstack, '\0');
+ char *string = obstack_finish(&symbol_obstack);
- if(c == 'e' || c == 'E') {
- next_char();
- parse_floatingpoint_exponent(value);
- return;
+ const char *endptr;
+ lexer_token.type = T_INTEGER;
+ lexer_token.v.intvalue = parse_int_string(string, &endptr, 8);
+ if(*endptr != '\0') {
+ parse_error("octal number literal too long");
}
- lexer_token.type = T_FLOATINGPOINT;
- lexer_token.v.floatvalue = value;
+ obstack_free(&symbol_obstack, string);
+ parse_integer_suffix();
}
static void parse_number_dec(void)
{
- int value = 0;
-
+ bool is_float = false;
while(isdigit(c)) {
- value = 10 * value + c - '0';
+ obstack_1grow(&symbol_obstack, c);
next_char();
}
if(c == '.') {
+ obstack_1grow(&symbol_obstack, '.');
next_char();
- parse_floatingpoint_fract(value);
- return;
+
+ while(isdigit(c)) {
+ obstack_1grow(&symbol_obstack, c);
+ next_char();
+ }
+ is_float = true;
}
if(c == 'e' || c == 'E') {
+ obstack_1grow(&symbol_obstack, 'e');
next_char();
- parse_floatingpoint_exponent(value);
- return;
+
+ if(c == '-' || c == '+') {
+ obstack_1grow(&symbol_obstack, c);
+ next_char();
+ }
+
+ while(isdigit(c)) {
+ obstack_1grow(&symbol_obstack, c);
+ next_char();
+ }
+ is_float = true;
}
- parse_integer_suffix();
- lexer_token.type = T_INTEGER;
- lexer_token.v.intvalue = value;
+ obstack_1grow(&symbol_obstack, '\0');
+ char *string = obstack_finish(&symbol_obstack);
+
+ if(is_float) {
+ char *endptr;
+ lexer_token.type = T_FLOATINGPOINT;
+ lexer_token.v.floatvalue = strtold(string, &endptr);
+
+ if(*endptr != '\0') {
+ parse_error("invalid number literal");
+ }
+
+ parse_floating_suffix();
+ } else {
+ const char *endptr;
+ lexer_token.type = T_INTEGER;
+ lexer_token.v.intvalue = parse_int_string(string, &endptr, 10);
+
+ if(*endptr != '\0') {
+ parse_error("invalid number literal");
+ }
+
+ parse_integer_suffix();
+ }
+ obstack_free(&symbol_obstack, string);
}
static void parse_number(void)
case '7':
parse_number_oct();
break;
- case '.':
- next_char();
- parse_floatingpoint_fract(0);
- break;
- case 'e':
- case 'E':
- parse_floatingpoint_exponent(0);
- break;
case '8':
case '9':
next_char();
parse_error("invalid octal number");
lexer_token.type = T_ERROR;
return;
+ case '.':
+ case 'e':
+ case 'E':
default:
- put_back(c);
- c = '0';
+ obstack_1grow(&symbol_obstack, '0');
parse_number_dec();
return;
}
}
}
-static int parse_octal_sequence(void)
+static int parse_octal_sequence(const int first_digit)
{
- int value = 0;
- while(1) {
- if(c < '0' || c > '7')
- break;
- value = 8 * value + c - '0';
- next_char();
- }
-
- return value;
+ assert(is_octal_digit(first_digit));
+ int value = first_digit - '0';
+ if (!is_octal_digit(c)) return value;
+ value = 8 * value + c - '0';
+ next_char();
+ if (!is_octal_digit(c)) return value;
+ value = 8 * value + c - '0';
+ next_char();
+ return (char_type)value;
}
static int parse_hex_sequence(void)
next_char();
}
- return value;
+ return (char_type)value;
}
static int parse_escape_sequence(void)
switch(ec) {
case '"': return '"';
- case '\'': return'\'';
+ case '\'': return '\'';
case '\\': return '\\';
case '?': return '\?';
case 'a': return '\a';
case '5':
case '6':
case '7':
- return parse_octal_sequence();
+ return parse_octal_sequence(ec);
case EOF:
parse_error("reached end of file while parsing escape sequence");
return EOF;
if(pp_token.type != T_INTEGER) {
parse_error("expected integer");
} else {
- lexer_token.source_position.linenr = pp_token.v.intvalue - 1;
+ lexer_token.source_position.linenr = (unsigned int)(pp_token.v.intvalue - 1);
next_pp_token();
}
if(pp_token.type == T_STRING_LITERAL) {
}
}
-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 init_lexer(void)
{
strset_init(&stringset);
+
+ type_int = make_atomic_type(ATOMIC_TYPE_INT, TYPE_QUALIFIER_CONST);
+ type_uint = make_atomic_type(ATOMIC_TYPE_UINT, TYPE_QUALIFIER_CONST);
+ type_long = make_atomic_type(ATOMIC_TYPE_LONG, TYPE_QUALIFIER_CONST);
+ type_ulong = make_atomic_type(ATOMIC_TYPE_ULONG, TYPE_QUALIFIER_CONST);
+ type_longlong = make_atomic_type(ATOMIC_TYPE_LONGLONG,
+ TYPE_QUALIFIER_CONST);
+ type_ulonglong = make_atomic_type(ATOMIC_TYPE_ULONGLONG,
+ TYPE_QUALIFIER_CONST);
+
+ type_float = make_atomic_type(ATOMIC_TYPE_FLOAT, TYPE_QUALIFIER_CONST);
+ type_double = make_atomic_type(ATOMIC_TYPE_DOUBLE,
+ TYPE_QUALIFIER_CONST);
+ type_longdouble = make_atomic_type(ATOMIC_TYPE_LONG_DOUBLE,
+ TYPE_QUALIFIER_CONST);
}
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)
projects / cparser / blobdiff