X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=lexer.c;h=7c610825bc24344e083cf5d71f97f1379ccc3278;hb=78cc65b14fc5c53a16368fe5975c70c83e969b19;hp=7e3ee4b490ac4ccc17b5771d55b9d8582fca7e4f;hpb=f4923ea7a98383c8a871a67ca9a78e1ee0f66ef3;p=cparser diff --git a/lexer.c b/lexer.c index 7e3ee4b..7c61082 100644 --- a/lexer.c +++ b/lexer.c @@ -1,288 +1,649 @@ #include -#include "lexer_t.h" +#include "diagnostic.h" +#include "lexer.h" #include "token_t.h" #include "symbol_table_t.h" #include "adt/error.h" +#include "adt/strset.h" +#include "adt/util.h" +#include "types.h" +#include "type_t.h" +#include "target_architecture.h" +#include "parser.h" +#include "warning.h" #include #include #include +#include #include //#define DEBUG_CHARS -#define MAX_PUTBACK 2 +#define MAX_PUTBACK 3 -static -void error_prefix_at(lexer_t *this, const char *input_name, unsigned linenr) +#ifdef _WIN32 +/* No strtold on windows and no replacement yet */ +#define strtold(s, e) strtod(s, e) +#endif + +#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 void error_prefix_at(const char *input_name, unsigned linenr) { - (void) this; - fprintf(stderr, "%s:%d: Error: ", input_name, linenr); + fprintf(stderr, "%s:%u: Error: ", input_name, linenr); } -static -void error_prefix(lexer_t *this) +static void error_prefix(void) { - error_prefix_at(this, this->source_position.input_name, - this->source_position.linenr); + error_prefix_at(lexer_token.source_position.input_name, + lexer_token.source_position.linenr); } -static -void parse_error(lexer_t *this, const char *msg) +static void parse_error(const char *msg) { - error_prefix(this); + error_prefix(); fprintf(stderr, "%s\n", msg); } -static inline -void next_char(lexer_t *this) +static inline void next_real_char(void) { - this->bufpos++; - if(this->bufpos >= this->bufend) { - size_t s = fread(this->buf + MAX_PUTBACK, 1, - sizeof(this->buf) - MAX_PUTBACK, this->input); + assert(bufpos <= bufend); + if (bufpos >= bufend) { + size_t s = fread(buf + MAX_PUTBACK, 1, sizeof(buf) - MAX_PUTBACK, + input); if(s == 0) { - this->c = EOF; + c = EOF; return; } - this->bufpos = this->buf + MAX_PUTBACK; - this->bufend = this->buf + MAX_PUTBACK + s; + bufpos = buf + MAX_PUTBACK; + bufend = buf + MAX_PUTBACK + s; } - this->c = *(this->bufpos); -#ifdef DEBUG_CHARS - printf("nchar '%c'\n", this->c); -#endif + c = *bufpos++; } -static inline -void put_back(lexer_t *this, int c) +static inline void put_back(int pc) { - char *p = (char*) this->bufpos - 1; - this->bufpos--; - assert(p >= this->buf); - *p = c; + assert(bufpos > buf); + *(--bufpos - buf + buf) = (char) pc; #ifdef DEBUG_CHARS - printf("putback '%c'\n", c); + printf("putback '%c'\n", pc); #endif } -static -int replace_trigraph(lexer_t *this) -{ -#define MATCH_TRIGRAPH(ch,replacement) \ - case ch: \ - this->c = replacement; \ - return 1; - - switch(this->c) { - MATCH_TRIGRAPH('=', '#') - MATCH_TRIGRAPH('(', '[') - MATCH_TRIGRAPH('/', '\\') - MATCH_TRIGRAPH(')', ']') - MATCH_TRIGRAPH('\'', '^') - MATCH_TRIGRAPH('<', '{') - MATCH_TRIGRAPH('!', '|') - MATCH_TRIGRAPH('>', '}') - MATCH_TRIGRAPH('-', '~') +static inline void next_char(void); + +#define MATCH_NEWLINE(code) \ + case '\r': \ + next_char(); \ + if(c == '\n') { \ + next_char(); \ + } \ + lexer_token.source_position.linenr++; \ + code \ + case '\n': \ + next_char(); \ + 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) +{ + eat('\\'); + + switch(c) { + MATCH_NEWLINE(return;) + + default: + break; + } + + put_back(c); + c = '\\'; +} + +static inline void next_char(void) +{ + next_real_char(); + + /* filter trigraphs */ + if(UNLIKELY(c == '\\')) { + maybe_concat_lines(); + goto end_of_next_char; + } + + if(LIKELY(c != '?')) + goto end_of_next_char; + + next_real_char(); + if(LIKELY(c != '?')) { + put_back(c); + c = '?'; + goto end_of_next_char; + } + + next_real_char(); + switch(c) { + case '=': c = '#'; break; + case '(': c = '['; break; + case '/': c = '\\'; maybe_concat_lines(); break; + case ')': c = ']'; break; + case '\'': c = '^'; break; + case '<': c = '{'; break; + case '!': c = '|'; break; + case '>': c = '}'; break; + case '-': c = '~'; break; default: + put_back(c); + put_back('?'); + c = '?'; break; } - return 0; +end_of_next_char:; +#ifdef DEBUG_CHARS + printf("nchar '%c'\n", c); +#endif } -static -void parse_symbol(lexer_t *this, token_t *token) +#define SYMBOL_CHARS \ + case 'a': \ + case 'b': \ + case 'c': \ + case 'd': \ + case 'e': \ + case 'f': \ + case 'g': \ + case 'h': \ + case 'i': \ + case 'j': \ + case 'k': \ + case 'l': \ + case 'm': \ + case 'n': \ + case 'o': \ + case 'p': \ + case 'q': \ + case 'r': \ + case 's': \ + case 't': \ + case 'u': \ + case 'v': \ + case 'w': \ + case 'x': \ + case 'y': \ + case 'z': \ + case 'A': \ + case 'B': \ + case 'C': \ + case 'D': \ + case 'E': \ + case 'F': \ + case 'G': \ + case 'H': \ + case 'I': \ + case 'J': \ + case 'K': \ + case 'L': \ + case 'M': \ + case 'N': \ + case 'O': \ + case 'P': \ + case 'Q': \ + case 'R': \ + case 'S': \ + case 'T': \ + case 'U': \ + case 'V': \ + case 'W': \ + case 'X': \ + case 'Y': \ + case 'Z': \ + case '_': + +#define DIGITS \ + case '0': \ + case '1': \ + case '2': \ + case '3': \ + case '4': \ + case '5': \ + case '6': \ + case '7': \ + case '8': \ + case '9': + +static void parse_symbol(void) { symbol_t *symbol; char *string; - obstack_1grow(&symbol_obstack, this->c); - next_char(this); + obstack_1grow(&symbol_obstack, (char) c); + next_char(); while(1) { - switch(this->c) { - case '\\': - next_char(this); - if(this->c == '\n') { - next_char(this); - this->source_position.linenr++; - break; - } - - case 'A' ... 'Z': - case 'a' ... 'z': - case '_': - obstack_1grow(&symbol_obstack, this->c); - next_char(this); + switch(c) { + DIGITS + SYMBOL_CHARS + obstack_1grow(&symbol_obstack, (char) c); + next_char(); break; - case '?': - next_char(this); - if(this->c != '?') { - put_back(this, this->c); - this->c = '?'; - goto end_symbol; - } - next_char(this); - if(replace_trigraph(this)) - break; - put_back(this, '?'); - put_back(this, this->c); - this->c = '?'; - goto end_symbol; - default: goto end_symbol; } } + end_symbol: obstack_1grow(&symbol_obstack, '\0'); string = obstack_finish(&symbol_obstack); symbol = symbol_table_insert(string); - if(symbol->ID > 0) { - token->type = symbol->ID; - } else { - token->type = T_IDENTIFIER; - } - token->v.symbol = symbol; + lexer_token.type = symbol->ID; + lexer_token.v.symbol = symbol; if(symbol->string != string) { obstack_free(&symbol_obstack, string); } } -#if 0 -static -preprocessor_token_type_t parse_pp_symbol(lexer_t *this) +static void parse_integer_suffix(bool is_oct_hex) { - do { - obstack_1grow(&symbol_obstack, this->c); - next_char(this); - } while(is_ident_char(this->c)); - obstack_1grow(&symbol_obstack, '\0'); + bool is_unsigned = false; + bool min_long = false; + bool min_longlong = false; + + if(c == 'U' || c == 'u') { + is_unsigned = true; + next_char(); + if(c == 'L' || c == 'l') { + min_long = true; + next_char(); + if(c == 'L' || c == 'l') { + min_longlong = true; + next_char(); + } + } + } else if(c == 'l' || c == 'L') { + min_long = true; + next_char(); + if(c == 'l' || c == 'L') { + min_longlong = true; + next_char(); + if(c == 'u' || c == 'U') { + is_unsigned = true; + next_char(); + } + } else if(c == 'u' || c == 'U') { + is_unsigned = true; + next_char(); + lexer_token.datatype = type_unsigned_long; + } + } - char *string = obstack_finish(&symbol_obstack); - symbol_t *symbol = preprocessor_symbol_table_find(string); - obstack_free(&symbol_obstack, string); + if(!is_unsigned) { + long long v = lexer_token.v.intvalue; + if(!min_long) { + if(v >= TARGET_INT_MIN && v <= TARGET_INT_MAX) { + lexer_token.datatype = type_int; + return; + } else if(is_oct_hex && v >= 0 && v <= TARGET_UINT_MAX) { + lexer_token.datatype = type_unsigned_int; + return; + } + } + if(!min_longlong) { + if(v >= TARGET_LONG_MIN && v <= TARGET_LONG_MAX) { + lexer_token.datatype = type_long; + return; + } else if(is_oct_hex && v >= 0 && v <= TARGET_ULONG_MAX) { + lexer_token.datatype = type_unsigned_long; + return; + } + } + unsigned long long uv = (unsigned long long) v; + if(is_oct_hex && uv > (unsigned long long) TARGET_LONGLONG_MAX) { + lexer_token.datatype = type_unsigned_long_long; + return; + } - if(symbol == 0) - return TP_ERROR; + lexer_token.datatype = type_long_long; + } else { + unsigned long long v = (unsigned long long) lexer_token.v.intvalue; + if(!min_long && v <= TARGET_UINT_MAX) { + lexer_token.datatype = type_unsigned_int; + return; + } + if(!min_longlong && v <= TARGET_ULONG_MAX) { + lexer_token.datatype = type_unsigned_long; + return; + } + lexer_token.datatype = type_unsigned_long_long; + } +} - return symbol->ID; +static void parse_floating_suffix(void) +{ + 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_long_double; + break; + default: + lexer_token.datatype = type_double; + break; + } +} + +/** + * 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; } -#endif -static -void parse_number_hex(lexer_t *this, token_t *token) +static void parse_number_hex(void) { - assert(this->c == 'x' || this->c == 'X'); - next_char(this); + assert(c == 'x' || c == 'X'); + next_char(); - if (!isdigit(this->c) && - !('A' <= this->c && this->c <= 'F') && - !('a' <= this->c && this->c <= 'f')) { - parse_error(this, "premature end of hex number literal"); - token->type = T_ERROR; - return; + while(isxdigit(c)) { + obstack_1grow(&symbol_obstack, (char) c); + next_char(); } + obstack_1grow(&symbol_obstack, '\0'); + char *string = obstack_finish(&symbol_obstack); - int value = 0; - for(;;) { - if (isdigit(this->c)) { - value = 16 * value + this->c - '0'; - } else if ('A' <= this->c && this->c <= 'F') { - value = 16 * value + this->c - 'A' + 10; - } else if ('a' <= this->c && this->c <= 'f') { - value = 16 * value + this->c - 'a' + 10; - } else { - token->type = T_INTEGER; - token->v.intvalue = value; - return; - } - next_char(this); + if(c == '.' || c == 'p' || c == 'P') { + next_char(); + panic("Hex floating point numbers not implemented yet"); + } + if(*string == '\0') { + parse_error("invalid hex number"); + lexer_token.type = T_ERROR; } + + const char *endptr; + lexer_token.type = T_INTEGER; + 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(true); } -static -void parse_number_oct(lexer_t *this, token_t *token) +static inline bool is_octal_digit(int chr) { - assert(this->c == 'o' || this->c == 'O'); - next_char(this); + return '0' <= chr && chr <= '7'; +} - int value = 0; - for(;;) { - if ('0' <= this->c && this->c <= '7') { - value = 8 * value + this->c - '0'; - } else { - token->type = T_INTEGER; - token->v.intvalue = value; - return; - } - next_char(this); +static void parse_number_oct(void) +{ + while(is_octal_digit(c)) { + obstack_1grow(&symbol_obstack, (char) c); + next_char(); + } + obstack_1grow(&symbol_obstack, '\0'); + char *string = obstack_finish(&symbol_obstack); + + 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"); } + + obstack_free(&symbol_obstack, string); + parse_integer_suffix(true); } -static -void parse_number_dec(lexer_t *this, token_t *token, int first_char) +static void parse_number_dec(void) { - int value = 0; - if(first_char > 0) { - assert(first_char >= '0' && first_char <= '9'); - value = first_char - '0'; + bool is_float = false; + while(isdigit(c)) { + obstack_1grow(&symbol_obstack, (char) c); + next_char(); } - for(;;) { - if (isdigit(this->c)) { - value = 10 * value + this->c - '0'; - } else { - token->type = T_INTEGER; - token->v.intvalue = value; - return; + if(c == '.') { + obstack_1grow(&symbol_obstack, '.'); + next_char(); + + while(isdigit(c)) { + obstack_1grow(&symbol_obstack, (char) c); + next_char(); + } + is_float = true; + } + if(c == 'e' || c == 'E') { + obstack_1grow(&symbol_obstack, 'e'); + next_char(); + + if(c == '-' || c == '+') { + obstack_1grow(&symbol_obstack, (char) c); + next_char(); + } + + while(isdigit(c)) { + obstack_1grow(&symbol_obstack, (char) c); + next_char(); } - next_char(this); + is_float = true; + } + + 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(false); } + obstack_free(&symbol_obstack, string); } -static -void parse_number(lexer_t *this, token_t *token) +static void parse_number(void) { - // TODO check for overflow - // TODO check for various invalid inputs sequences - - if (this->c == '0') { - next_char(this); - switch (this->c) { + if (c == '0') { + next_char(); + switch (c) { case 'X': - case 'x': parse_number_hex(this, token); break; - case 'o': - case 'O': parse_number_oct(this, token); break; - default: parse_number_dec(this, token, '0'); + case 'x': + parse_number_hex(); + break; + case '0': + case '1': + case '2': + case '3': + case '4': + case '5': + case '6': + case '7': + parse_number_oct(); + break; + case '8': + case '9': + next_char(); + parse_error("invalid octal number"); + lexer_token.type = T_ERROR; + return; + case '.': + case 'e': + case 'E': + default: + obstack_1grow(&symbol_obstack, '0'); + parse_number_dec(); + return; } } else { - parse_number_dec(this, token, 0); + parse_number_dec(); } } -static -int parse_escape_sequence(lexer_t *this) +static int parse_octal_sequence(const int first_digit) { - int c = this->c; - next_char(this); + 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; +} - switch(c) { - case '"': return '"'; - case '\'': return'\''; - case '\\': - if(this->c == '\n') { - this->source_position.linenr++; - next_char(this); - return parse_escape_sequence(this); +static int parse_hex_sequence(void) +{ + int value = 0; + while(1) { + if (c >= '0' && c <= '9') { + 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 { + break; } - return '\\'; + next_char(); + } + + return (char_type)value; +} + +static int parse_escape_sequence(void) +{ + eat('\\'); + + 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'; @@ -290,92 +651,76 @@ int parse_escape_sequence(lexer_t *this) case 'r': return '\r'; case 't': return '\t'; case 'v': return '\v'; - case 'x': /* TODO parse hex number ... */ - parse_error(this, "hex escape sequences not implemented yet"); - return EOF; - case 0 ... 8: /* TODO parse octal number ... */ - parse_error(this, "octal escape sequences not implemented yet"); - return EOF; - case '?': - if(this->c != '?') { - return '?'; - } - /* might be a trigraph */ - next_char(this); - if(replace_trigraph(this)) { - return parse_escape_sequence(this); - } - put_back(this, this->c); - this->c = '?'; - return '?'; - + 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(ec); case EOF: - parse_error(this, "reached end of file while parsing escape sequence"); + parse_error("reached end of file while parsing escape sequence"); return EOF; default: - parse_error(this, "unknown escape sequence\n"); + parse_error("unknown escape sequence"); return EOF; } } -#define SKIP_TRIGRAPHS(no_trigraph_code) \ - case '?': \ - next_char(this); \ - if(this->c != '?') { \ - put_back(this, this->c); \ - this->c = '?'; \ - no_trigraph_code; \ - } \ - next_char(this); \ - if(replace_trigraph(this)) \ - break; \ - put_back(this, '?'); \ - put_back(this, this->c); \ - this->c = '?'; \ - no_trigraph_code; \ +string_t concat_strings(const string_t *const s1, const string_t *const s2) +{ + const size_t len1 = s1->size - 1; + const size_t len2 = s2->size - 1; + + char *const concat = obstack_alloc(&symbol_obstack, len1 + len2 + 1); + memcpy(concat, s1->begin, len1); + memcpy(concat + len1, s2->begin, len2 + 1); + +#if 0 /* TODO hash */ + const char *result = strset_insert(&stringset, concat); + if(result != concat) { + obstack_free(&symbol_obstack, concat); + } -static -void parse_string_literal(lexer_t *this, token_t *token) + return result; +#else + return (string_t){ concat, len1 + len2 + 1 }; +#endif +} + +static void parse_string_literal(void) { - unsigned start_linenr = this->source_position.linenr; - char *string; - const char *result; + const unsigned start_linenr = lexer_token.source_position.linenr; - assert(this->c == '"'); - next_char(this); + assert(c == '"'); + next_char(); + int tc; while(1) { - switch(this->c) { - SKIP_TRIGRAPHS( - obstack_1grow(&symbol_obstack, '?'); - break; - ) - + switch(c) { case '\\': - next_char(this); - if(this->c == '\n') { - next_char(this); - this->source_position.linenr++; - break; - } - int c = parse_escape_sequence(this); - obstack_1grow(&symbol_obstack, c); + tc = parse_escape_sequence(); + obstack_1grow(&symbol_obstack, (char) tc); break; case EOF: - error_prefix_at(this, this->source_position.input_name, + error_prefix_at(lexer_token.source_position.input_name, start_linenr); fprintf(stderr, "string has no end\n"); - token->type = T_ERROR; + lexer_token.type = T_ERROR; return; case '"': - next_char(this); + next_char(); goto end_of_string; default: - obstack_1grow(&symbol_obstack, this->c); - next_char(this); + obstack_1grow(&symbol_obstack, (char) c); + next_char(); break; } } @@ -386,252 +731,351 @@ end_of_string: /* add finishing 0 to the string */ obstack_1grow(&symbol_obstack, '\0'); - string = obstack_finish(&symbol_obstack); + const size_t size = (size_t)obstack_object_size(&symbol_obstack); + const char *const string = obstack_finish(&symbol_obstack); +#if 0 /* TODO hash */ /* check if there is already a copy of the string */ - result = strset_insert(&this->stringset, string); + result = strset_insert(&stringset, string); if(result != string) { obstack_free(&symbol_obstack, string); } +#else + const char *const result = string; +#endif - token->type = T_STRING_LITERAL; - token->v.string = result; + lexer_token.type = T_STRING_LITERAL; + lexer_token.v.string.begin = result; + lexer_token.v.string.size = size; } -static -void parse_character_constant(lexer_t *this, token_t *token) +static void parse_wide_character_constant(void) { - assert(this->c == '\''); - next_char(this); + eat('\''); + int found_char = 0; while(1) { - switch(this->c) { - SKIP_TRIGRAPHS( - token->type = T_INTEGER; - token->v.intvalue = '?'; - goto end_of_char_constant; + switch(c) { + case '\\': + found_char = parse_escape_sequence(); + break; + + MATCH_NEWLINE( + parse_error("newline while parsing character constant"); + break; ) - case '\\': - next_char(this); - if(this->c == '\n') { - this->source_position.linenr++; + case '\'': + next_char(); + goto end_of_wide_char_constant; + + case EOF: + parse_error("EOF while parsing character constant"); + lexer_token.type = T_ERROR; + return; + + default: + if(found_char != 0) { + parse_error("more than 1 characters in character " + "constant"); + goto end_of_wide_char_constant; + } else { + found_char = c; + next_char(); + } + break; + } + } + +end_of_wide_char_constant: + lexer_token.type = T_INTEGER; + lexer_token.v.intvalue = found_char; + lexer_token.datatype = type_wchar_t; +} + +static void parse_wide_string_literal(void) +{ + const unsigned start_linenr = lexer_token.source_position.linenr; + + assert(c == '"'); + next_char(); + + while(1) { + switch(c) { + case '\\': { + wchar_rep_t tc = parse_escape_sequence(); + obstack_grow(&symbol_obstack, &tc, sizeof(tc)); break; } - token->type = T_INTEGER; - token->v.intvalue = parse_escape_sequence(this); - goto end_of_char_constant; - case '\n': - next_char(this); - parse_error(this, "newline while parsing character constant"); - this->source_position.linenr++; + case EOF: + error_prefix_at(lexer_token.source_position.input_name, + start_linenr); + fprintf(stderr, "string has no end\n"); + lexer_token.type = T_ERROR; + return; + + case '"': + next_char(); + goto end_of_string; + + default: { + wchar_rep_t tc = c; + obstack_grow(&symbol_obstack, &tc, sizeof(tc)); + next_char(); + break; + } + } + } + +end_of_string:; + + /* TODO: concatenate multiple strings separated by whitespace... */ + + /* add finishing 0 to the string */ + wchar_rep_t nul = L'\0'; + obstack_grow(&symbol_obstack, &nul, sizeof(nul)); + const size_t size = (size_t)obstack_object_size(&symbol_obstack) / sizeof(wchar_rep_t); + const wchar_rep_t *const string = obstack_finish(&symbol_obstack); + +#if 0 /* TODO hash */ + /* check if there is already a copy of the string */ + const wchar_rep_t *const result = strset_insert(&stringset, string); + if(result != string) { + obstack_free(&symbol_obstack, string); + } +#else + const wchar_rep_t *const result = string; +#endif + + lexer_token.type = T_WIDE_STRING_LITERAL; + lexer_token.v.wide_string.begin = result; + lexer_token.v.wide_string.size = size; +} + +static void parse_character_constant(void) +{ + eat('\''); + + int found_char = 0; + while(1) { + switch(c) { + case '\\': + found_char = parse_escape_sequence(); + break; + + MATCH_NEWLINE( + parse_error("newline while parsing character constant"); + break; + ) + + case '\'': + next_char(); goto end_of_char_constant; case EOF: - parse_error(this, "EOF while parsing character constant"); - token->type = T_ERROR; + parse_error("EOF while parsing character constant"); + lexer_token.type = T_ERROR; return; default: - token->type = T_INTEGER; - token->v.intvalue = this->c; - next_char(this); - goto end_of_char_constant; + if(found_char != 0) { + parse_error("more than 1 characters in character " + "constant"); + goto end_of_char_constant; + } else { + found_char = c; + next_char(); + } + break; } } end_of_char_constant: - if(this->c != '\'') { - parse_error(this, "multibyte character constant"); - } else { - next_char(this); - } + lexer_token.type = T_INTEGER; + lexer_token.v.intvalue = found_char; + lexer_token.datatype = type_int; } -static -void skip_multiline_comment(lexer_t *this) +static void skip_multiline_comment(void) { - unsigned start_linenr = this->source_position.linenr; + unsigned start_linenr = lexer_token.source_position.linenr; while(1) { - switch(this->c) { + switch(c) { case '*': - next_char(this); - if(this->c == '/') { - next_char(this); + next_char(); + if(c == '/') { + next_char(); return; } break; - case '?': - next_char(this); - if(this->c != '?') - break; - next_char(this); - if(replace_trigraph(this)) - break; - put_back(this, '?'); - /* we don't put back the 2nd ? as the comment text is discarded - * anyway */ - break; - case '\n': - this->source_position.linenr++; - next_char(this); - break; + MATCH_NEWLINE(break;) + case EOF: - error_prefix_at(this, this->source_position.input_name, + error_prefix_at(lexer_token.source_position.input_name, start_linenr); fprintf(stderr, "at end of file while looking for comment end\n"); return; + default: - next_char(this); + next_char(); break; } } } -static -void skip_line_comment(lexer_t *this) +static void skip_line_comment(void) { while(1) { - switch(this->c) { - case '?': - next_char(this); - if(this->c != '?') - break; - next_char(this); - if(replace_trigraph(this)) - break; - put_back(this, '?'); - /* we don't put back the 2nd ? as the comment text is discarded - * anyway */ - break; - - case '\\': - next_char(this); - if(this->c == '\n') { - next_char(this); - this->source_position.linenr++; - } - break; - + switch(c) { case EOF: + return; + case '\n': + case '\r': return; + default: - next_char(this); + next_char(); break; } } } -#if 0 -static -void eat_until_newline(lexer_t *this) +static token_t pp_token; + +static inline void next_pp_token(void) { - while(this->c != '\n') { - next_char(this); - } + lexer_next_preprocessing_token(); + pp_token = lexer_token; } -#endif -#if 0 -static -void parse_preprocessor_directive(lexer_t *this, token_t *result_token) +static void eat_until_newline(void) { - (void) result_token; - /* skip whitespaces */ - while(this->c == ' ' || this->c == '\t' || this->c == '\r') { - next_char(this); + while(pp_token.type != '\n' && pp_token.type != T_EOF) { + next_pp_token(); } } -#endif -void preprocessor_next_token(lexer_t *this, token_t *token) +static void error_directive(void) { - /* skip whitespaces */ - while(this->c == ' ' || this->c == '\t' || this->c == '\r') { - next_char(this); - } + error_prefix(); + fprintf(stderr, "#error directive: \n"); - switch(this->c) { - case 'A' ... 'Z': - case 'a' ... 'z': - case '_': - parse_symbol(this, token); + /* parse pp-tokens until new-line */ +} + +static void define_directive(void) +{ + lexer_next_preprocessing_token(); + if(lexer_token.type != T_IDENTIFIER) { + parse_error("expected identifier after #define\n"); + eat_until_newline(); } } -void lexer_next_token(lexer_t *this, token_t *token) +static void ifdef_directive(int is_ifndef) { - while(1) { - switch(this->c) { - case ' ': - case '\t': - case '\r': - next_char(this); - break; + (void) is_ifndef; + lexer_next_preprocessing_token(); + //expect_identifier(); + //extect_newline(); +} - case '\n': - this->source_position.linenr++; - next_char(this); - break; +static void endif_directive(void) +{ + //expect_newline(); +} - case 'A' ... 'Z': - case 'a' ... 'z': - case '_': - parse_symbol(this, token); - return; +static void parse_line_directive(void) +{ + if(pp_token.type != T_INTEGER) { + parse_error("expected integer"); + } else { + lexer_token.source_position.linenr = (unsigned int)(pp_token.v.intvalue - 1); + next_pp_token(); + } + if(pp_token.type == T_STRING_LITERAL) { + lexer_token.source_position.input_name = pp_token.v.string.begin; + next_pp_token(); + } - case '0' ... '9': - parse_number(this, token); - return; + eat_until_newline(); +} - case '"': - parse_string_literal(this, token); - return; +static void parse_preprocessor_identifier(void) +{ + assert(pp_token.type == T_IDENTIFIER); + symbol_t *symbol = pp_token.v.symbol; - case '\'': - parse_character_constant(this, token); - return; + switch(symbol->pp_ID) { + case TP_include: + printf("include - enable header name parsing!\n"); + break; + case TP_define: + define_directive(); + break; + case TP_ifdef: + ifdef_directive(0); + break; + case TP_ifndef: + ifdef_directive(1); + break; + case TP_endif: + endif_directive(); + break; + case TP_line: + next_pp_token(); + parse_line_directive(); + break; + case TP_if: + case TP_else: + case TP_elif: + case TP_undef: + case TP_error: + error_directive(); + break; + case TP_pragma: + if (warning.unknown_pragmas) { + warningf(lexer_token.source_position, "encountered unknown #pragma"); + } + eat_until_newline(); + break; + } +} - case '\\': - next_char(this); - if(this->c == '\n') { - next_char(this); - this->source_position.linenr++; - break; - } else { - parse_error(this, "unexpected '\\' found"); - token->type = T_ERROR; - } - return; +static void parse_preprocessor_directive(void) +{ + next_pp_token(); + + switch(pp_token.type) { + case T_IDENTIFIER: + parse_preprocessor_identifier(); + break; + case T_INTEGER: + parse_line_directive(); + break; + default: + parse_error("invalid preprocessor directive"); + eat_until_newline(); + break; + } +} #define MAYBE_PROLOG \ - next_char(this); \ + next_char(); \ while(1) { \ - switch(this->c) { + switch(c) { #define MAYBE(ch, set_type) \ case ch: \ - next_char(this); \ - token->type = set_type; \ + next_char(); \ + lexer_token.type = set_type; \ return; #define ELSE_CODE(code) \ - SKIP_TRIGRAPHS( \ - code; \ - ) \ - \ - case '\\': \ - next_char(this); \ - if(this->c == '\n') { \ - next_char(this); \ - this->source_position.linenr++; \ - break; \ - } \ - /* fallthrough */ \ default: \ code; \ } \ @@ -640,19 +1084,73 @@ void lexer_next_token(lexer_t *this, token_t *token) #define ELSE(set_type) \ ELSE_CODE( \ - token->type = set_type; \ + lexer_token.type = set_type; \ return; \ ) +void lexer_next_preprocessing_token(void) +{ + while(1) { + switch(c) { + case ' ': + case '\t': + next_char(); + break; + + MATCH_NEWLINE( + lexer_token.type = '\n'; + return; + ) + + SYMBOL_CHARS + parse_symbol(); + /* might be a wide string ( L"string" ) */ + if(lexer_token.type == T_IDENTIFIER && + lexer_token.v.symbol == symbol_L) { + if(c == '"') { + parse_wide_string_literal(); + } else if(c == '\'') { + parse_wide_character_constant(); + } + } + return; + + DIGITS + parse_number(); + return; + + case '"': + parse_string_literal(); + return; + + case '\'': + parse_character_constant(); + return; + case '.': MAYBE_PROLOG + case '0': + case '1': + case '2': + case '3': + case '4': + case '5': + case '6': + case '7': + case '8': + case '9': + put_back(c); + c = '.'; + parse_number_dec(); + return; + case '.': MAYBE_PROLOG MAYBE('.', T_DOTDOTDOT) ELSE_CODE( - put_back(this, this->c); - this->c = '.'; - token->type = '.'; + put_back(c); + c = '.'; + lexer_token.type = '.'; return; ) ELSE('.') @@ -672,6 +1170,7 @@ void lexer_next_token(lexer_t *this, token_t *token) ELSE('+') case '-': MAYBE_PROLOG + MAYBE('>', T_MINUSGREATER) MAYBE('-', T_MINUSMINUS) MAYBE('=', T_MINUSEQUAL) ELSE('-') @@ -683,14 +1182,14 @@ void lexer_next_token(lexer_t *this, token_t *token) MAYBE_PROLOG MAYBE('=', T_SLASHEQUAL) case '*': - next_char(this); - skip_multiline_comment(this); - lexer_next_token(this, token); + next_char(); + skip_multiline_comment(); + lexer_next_preprocessing_token(); return; case '/': - next_char(this); - skip_line_comment(this); - lexer_next_token(this, token); + next_char(); + skip_line_comment(); + lexer_next_preprocessing_token(); return; ELSE('/') case '%': @@ -703,9 +1202,9 @@ void lexer_next_token(lexer_t *this, token_t *token) MAYBE_PROLOG MAYBE(':', T_PERCENTCOLONPERCENTCOLON) ELSE_CODE( - put_back(this, this->c); - this->c = '%'; - token->type = T_PERCENTCOLON; + put_back(c); + c = '%'; + lexer_token.type = T_PERCENTCOLON; return; ) ELSE(T_PERCENTCOLON) @@ -714,6 +1213,7 @@ void lexer_next_token(lexer_t *this, token_t *token) MAYBE_PROLOG MAYBE(':', T_LESSCOLON) MAYBE('%', T_LESSPERCENT) + MAYBE('=', T_LESSEQUAL) case '<': MAYBE_PROLOG MAYBE('=', T_LESSLESSEQUAL) @@ -721,6 +1221,7 @@ void lexer_next_token(lexer_t *this, token_t *token) ELSE('<') case '>': MAYBE_PROLOG + MAYBE('=', T_GREATEREQUAL) case '>': MAYBE_PROLOG MAYBE('=', T_GREATERGREATEREQUAL) @@ -746,35 +1247,9 @@ void lexer_next_token(lexer_t *this, token_t *token) case '#': MAYBE_PROLOG MAYBE('#', T_HASHHASH) -#if 0 - else { - if(line_begin) { - parse_preprocessor_directive(this, token); - return; - } else { - token->type = '#'; - } -#else ELSE('#') -#endif case '?': - next_char(this); - /* just a simple ? */ - if(this->c != '?') { - token->type = '?'; - return; - } - /* might be a trigraph */ - next_char(this); - if(replace_trigraph(this)) { - break; - } - put_back(this, this->c); - this->c = '?'; - token->type = '?'; - return; - case '[': case ']': case '(': @@ -784,47 +1259,71 @@ void lexer_next_token(lexer_t *this, token_t *token) case '~': case ';': case ',': - token->type = this->c; - next_char(this); + case '\\': + lexer_token.type = c; + next_char(); return; case EOF: - token->type = T_EOF; + lexer_token.type = T_EOF; return; default: - next_char(this); - error_prefix(this); - fprintf(stderr, "unknown character '%c' found\n", this->c); - token->type = T_ERROR; + next_char(); + error_prefix(); + fprintf(stderr, "unknown character '%c' found\n", c); + lexer_token.type = T_ERROR; return; } } } -void lexer_init(lexer_t *this, FILE *stream, const char *input_name) +void lexer_next_token(void) { - memset(this, 0, sizeof(this[0])); + lexer_next_preprocessing_token(); + if(lexer_token.type != '\n') + return; + +newline_found: + do { + lexer_next_preprocessing_token(); + } while(lexer_token.type == '\n'); - this->input = stream; + if(lexer_token.type == '#') { + parse_preprocessor_directive(); + goto newline_found; + } +} + +void init_lexer(void) +{ + strset_init(&stringset); +} + +void lexer_open_stream(FILE *stream, const char *input_name) +{ + input = stream; + lexer_token.source_position.linenr = 0; + lexer_token.source_position.input_name = input_name; - this->source_position.linenr = 0; - this->source_position.input_name = input_name; - strset_init(&this->stringset); + symbol_L = symbol_table_insert("L"); + bufpos = NULL; + bufend = NULL; - /* we place a virtual '\n' at the beginning so the lexer knows we're at the - * beginning of a line */ - this->c = '\n'; + /* place a virtual \n at the beginning so the lexer knows that we're + * at the beginning of a line */ + c = '\n'; } -void lexer_destroy(lexer_t *this) +void exit_lexer(void) { - (void) this; + strset_destroy(&stringset); } static __attribute__((unused)) void dbg_pos(const source_position_t source_position) { - fprintf(stdout, "%s:%d\n", source_position.input_name, source_position.linenr); + fprintf(stdout, "%s:%u\n", source_position.input_name, + source_position.linenr); fflush(stdout); }