X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=lexer.c;h=faecfe36fd75f32a12ceca0c883bdb597f1e97b1;hb=f2fe6316c424c6f6329c5f7cb037153c5b0ccf91;hp=ec96a35418d43c5811ee0c80757854c5c738a53b;hpb=97f33b63c421063c4cbc869c60076b9132667835;p=cparser diff --git a/lexer.c b/lexer.c index ec96a35..faecfe3 100644 --- a/lexer.c +++ b/lexer.c @@ -1,52 +1,86 @@ +/* + * This file is part of cparser. + * Copyright (C) 2007-2008 Matthias Braun + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA + * 02111-1307, USA. + */ #include -#include "lexer_t.h" +#include "diagnostic.h" +#include "lexer.h" +#include "symbol_t.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 "lang_features.h" #include #include #include +#include #include //#define DEBUG_CHARS #define MAX_PUTBACK 3 -static int c; -source_position_t source_position; -static FILE *input; -static char buf[1027]; -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) -{ - fprintf(stderr, "%s:%d: Error: ", input_name, linenr); -} +#ifdef _WIN32 +/* No strtold on windows and no replacement yet */ +#define strtold(s, e) strtod(s, e) +#endif -static -void error_prefix() +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; + +/** + * Prints a parse error message at the current token. + * + * @param msg the error message + */ +static void parse_error(const char *msg) { - error_prefix_at(source_position.input_name, source_position.linenr); + errorf(&lexer_token.source_position, "%s", msg); } -static -void parse_error(const char *msg) +/** + * Prints an internal error message at the current token. + * + * @param msg the error message + */ +static NORETURN internal_error(const char *msg) { - error_prefix(); - fprintf(stderr, "%s\n", msg); + internal_errorf(&lexer_token.source_position, "%s", msg); } -static inline -void next_char() +static inline void next_real_char(void) { - bufpos++; - if(bufpos >= bufend) { + assert(bufpos <= bufend); + if (bufpos >= bufend) { size_t s = fread(buf + MAX_PUTBACK, 1, sizeof(buf) - MAX_PUTBACK, input); if(s == 0) { @@ -56,83 +90,104 @@ void next_char() bufpos = buf + MAX_PUTBACK; bufend = buf + MAX_PUTBACK + s; } - c = *(bufpos); -#ifdef DEBUG_CHARS - printf("nchar '%c'\n", c); -#endif + c = *bufpos++; } -static inline -void put_back(int pc) +/** + * Put a character back into the buffer. + * + * @param pc the character to put back + */ +static inline void put_back(int pc) { - char *p = (char*) bufpos - 1; - bufpos--; - assert(p >= buf); - *p = pc; + assert(bufpos > buf); + *(--bufpos - buf + buf) = (char) pc; #ifdef DEBUG_CHARS printf("putback '%c'\n", pc); #endif } +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 -static -int replace_trigraph(void) +#define eat(c_type) do { assert(c == c_type); next_char(); } while(0) + +static void maybe_concat_lines(void) { -#define MATCH_TRIGRAPH(ch,replacement) \ - case ch: \ - c = replacement; \ - return 1; + eat('\\'); switch(c) { - MATCH_TRIGRAPH('=', '#') - MATCH_TRIGRAPH('(', '[') - MATCH_TRIGRAPH('/', '\\') - MATCH_TRIGRAPH(')', ']') - MATCH_TRIGRAPH('\'', '^') - MATCH_TRIGRAPH('<', '{') - MATCH_TRIGRAPH('!', '|') - MATCH_TRIGRAPH('>', '}') - MATCH_TRIGRAPH('-', '~') + MATCH_NEWLINE(return;) + default: break; } - return 0; + put_back(c); + c = '\\'; } -#define SKIP_TRIGRAPHS(custom_putback, no_trigraph_code) \ - case '?': \ - next_char(); \ - if(c != '?') { \ - custom_putback; \ - put_back(c); \ - c = '?'; \ - no_trigraph_code; \ - } \ - next_char(); \ - if(replace_trigraph()) { \ - break; \ - } \ - custom_putback; \ - put_back('?'); \ - put_back(c); \ - c = '?'; \ - no_trigraph_code; - -#define EAT_NEWLINE(newline_code) \ - if(c == '\r') { \ - next_char(); \ - if(c == '\n') \ - next_char(); \ - source_position.linenr++; \ - newline_code; \ - } else if(c == '\n') { \ - next_char(); \ - source_position.linenr++; \ - newline_code; \ +/** + * Set c to the next input character, ie. + * after expanding trigraphs. + */ +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; + } + +end_of_next_char:; +#ifdef DEBUG_CHARS + printf("nchar '%c'\n", c); +#endif +} + #define SYMBOL_CHARS \ case 'a': \ case 'b': \ @@ -188,245 +243,646 @@ int replace_trigraph(void) case 'Z': \ case '_': -static -void parse_symbol(token_t *token) +#define DIGITS \ + case '0': \ + case '1': \ + case '2': \ + case '3': \ + case '4': \ + case '5': \ + case '6': \ + case '7': \ + case '8': \ + case '9': + +/** + * Read a symbol from the input and build + * the lexer_token. + */ +static void parse_symbol(void) { symbol_t *symbol; char *string; - obstack_1grow(&symbol_obstack, c); + obstack_1grow(&symbol_obstack, (char) c); next_char(); while(1) { switch(c) { - case '\\': - next_char(); - EAT_NEWLINE(break;) - goto end_symbol; - + DIGITS SYMBOL_CHARS - obstack_1grow(&symbol_obstack, c); + obstack_1grow(&symbol_obstack, (char) c); next_char(); break; - case '?': - next_char(); - if(c != '?') { - put_back(c); - c = '?'; - goto end_symbol; - } - next_char(); - if(replace_trigraph()) - break; - put_back('?'); - put_back(c); - 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); - token->type = symbol->ID; - token->v.symbol = symbol; + lexer_token.type = symbol->ID; + lexer_token.v.symbol = symbol; if(symbol->string != string) { obstack_free(&symbol_obstack, string); } } -static -void parse_number_hex(token_t *token) +static void parse_integer_suffix(bool is_oct_hex) { - assert(c == 'x' || c == 'X'); - next_char(); + bool is_unsigned = false; + bool min_long = false; + bool min_longlong = false; - if (!isdigit(c) && - !('A' <= c && c <= 'F') && - !('a' <= c && c <= 'f')) { - parse_error("premature end of hex number literal"); - token->type = T_ERROR; - return; + 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; + } } - int value = 0; - for(;;) { - 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 { - token->type = T_INTEGER; - token->v.intvalue = value; + 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 && (unsigned long long)v <= (unsigned long long)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; + } + + 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; + } +} + +static void parse_floating_suffix(void) +{ + switch(c) { + /* TODO: do something useful 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; } -static -void parse_number_oct(token_t *token) +/** + * Parses a hex number including hex floats and set the + * lexer_token. + */ +static void parse_number_hex(void) { - assert(c == 'o' || c == 'O'); + assert(c == 'x' || c == 'X'); next_char(); - int value = 0; - for(;;) { - if ('0' <= c && c <= '7') { - value = 8 * value + c - '0'; - } else { - token->type = T_INTEGER; - token->v.intvalue = value; - return; - } + while(isxdigit(c)) { + obstack_1grow(&symbol_obstack, (char) c); next_char(); } + obstack_1grow(&symbol_obstack, '\0'); + char *string = obstack_finish(&symbol_obstack); + + if(c == '.' || c == 'p' || c == 'P') { + next_char(); + internal_error("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_dec(token_t *token, int first_char) +/** + * Returns true if the given char is a octal digit. + * + * @param char the character to check + */ +static inline bool is_octal_digit(int chr) { - int value = 0; - if(first_char > 0) { - assert(first_char >= '0' && first_char <= '9'); - value = first_char - '0'; + switch(chr) { + case '0': + case '1': + case '2': + case '3': + case '4': + case '5': + case '6': + case '7': + return true; + default: + return false; } +} - for(;;) { - if (isdigit(c)) { - value = 10 * value + c - '0'; - } else { - token->type = T_INTEGER; - token->v.intvalue = value; - return; - } +/** + * Parses a octal number and set the lexer_token. + */ +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(token_t *token) +/** + * Parses a decimal including float number and set the + * lexer_token. + */ +static void parse_number_dec(void) { - // TODO check for overflow - // TODO check for various invalid inputs sequences + bool is_float = false; + while(isdigit(c)) { + obstack_1grow(&symbol_obstack, (char) c); + next_char(); + } + + 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(); + } + 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); +} + +/** + * Parses a number and sets the lexer_token. + */ +static void parse_number(void) +{ if (c == '0') { next_char(); switch (c) { case 'X': - case 'x': parse_number_hex(token); break; - case 'o': - case 'O': parse_number_oct(token); break; - default: parse_number_dec(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(token, 0); + parse_number_dec(); } } -static -int parse_escape_sequence() +/** + * Returns the value of a digit. + * The only portable way to do it ... + */ +static int digit_value(int digit) { + switch (digit) { + case '0': return 0; + case '1': return 1; + case '2': return 2; + case '3': return 3; + case '4': return 4; + case '5': return 5; + case '6': return 6; + case '7': return 7; + case '8': return 8; + case '9': return 9; + case 'a': + case 'A': return 10; + case 'b': + case 'B': return 11; + case 'c': + case 'C': return 12; + case 'd': + case 'D': return 13; + case 'e': + case 'E': return 14; + case 'f': + case 'F': return 15; + default: + internal_error("wrong character given"); + } +} + +/** + * Parses an octal character sequence. + * + * @param first_digit the already read first digit + */ +static int parse_octal_sequence(const int first_digit) { - while(1) { - int ec = c; - next_char(); + assert(is_octal_digit(first_digit)); + int value = digit_value(first_digit); + if (!is_octal_digit(c)) return value; + value = 8 * value + digit_value(c); + next_char(); + if (!is_octal_digit(c)) return value; + value = 8 * value + digit_value(c); + next_char(); - switch(ec) { - case '"': return '"'; - case '\'': return'\''; - case '\\': - EAT_NEWLINE(break;) - 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': /* TODO parse hex number ... */ - parse_error("hex escape sequences not implemented yet"); - return EOF; - case 0: - case 1: - case 2: - case 3: - case 4: - case 5: - case 6: - case 7: - /* TODO parse octal number ... */ - parse_error("octal escape sequences not implemented yet"); - return EOF; - case '?': - if(c != '?') { - return '?'; - } - /* might be a trigraph */ - next_char(); - if(replace_trigraph()) { - break; - } - put_back(c); - c = '?'; - return '?'; + if(char_is_signed) { + return (signed char) value; + } else { + return (unsigned char) value; + } +} - case EOF: - parse_error("reached end of file while parsing escape sequence"); - return EOF; - default: - parse_error("unknown escape sequence"); - return EOF; - } +/** + * Parses a hex character sequence. + */ +static int parse_hex_sequence(void) +{ + int value = 0; + while(isxdigit(c)) { + value = 16 * value + digit_value(c); + next_char(); + } + + if(char_is_signed) { + return (signed char) value; + } else { + return (unsigned char) value; } } -static -void parse_string_literal(token_t *token) +/** + * Parse an escape sequence. + */ +static int parse_escape_sequence(void) { - unsigned start_linenr = source_position.linenr; - char *string; - const char *result; + eat('\\'); - assert(c == '"'); + 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(ec); + case EOF: + parse_error("reached end of file while parsing escape sequence"); + return EOF; + default: + parse_error("unknown escape sequence"); + return EOF; + } +} + +/** + * Concatenate two strings. + */ +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); + } + + return result; +#else + return (string_t){ concat, len1 + len2 + 1 }; +#endif +} + +/** + * Concatenate a string and a wide string. + */ +wide_string_t concat_string_wide_string(const string_t *const s1, const wide_string_t *const s2) +{ + const size_t len1 = s1->size - 1; + const size_t len2 = s2->size - 1; + + wchar_rep_t *const concat = obstack_alloc(&symbol_obstack, (len1 + len2 + 1) * sizeof(*concat)); + const char *const src = s1->begin; + for (size_t i = 0; i != len1; ++i) { + concat[i] = src[i]; + } + memcpy(concat + len1, s2->begin, (len2 + 1) * sizeof(*concat)); + + return (wide_string_t){ concat, len1 + len2 + 1 }; +} + +/** + * Concatenate two wide strings. + */ +wide_string_t concat_wide_strings(const wide_string_t *const s1, const wide_string_t *const s2) +{ + const size_t len1 = s1->size - 1; + const size_t len2 = s2->size - 1; + + wchar_rep_t *const concat = obstack_alloc(&symbol_obstack, (len1 + len2 + 1) * sizeof(*concat)); + memcpy(concat, s1->begin, len1 * sizeof(*concat)); + memcpy(concat + len1, s2->begin, (len2 + 1) * sizeof(*concat)); + + return (wide_string_t){ concat, len1 + len2 + 1 }; +} + +/** + * Concatenate a wide string and a string. + */ +wide_string_t concat_wide_string_string(const wide_string_t *const s1, const string_t *const s2) +{ + const size_t len1 = s1->size - 1; + const size_t len2 = s2->size - 1; + + wchar_rep_t *const concat = obstack_alloc(&symbol_obstack, (len1 + len2 + 1) * sizeof(*concat)); + memcpy(concat, s1->begin, len1 * sizeof(*concat)); + const char *const src = s2->begin; + for (size_t i = 0; i != len2 + 1; ++i) { + concat[i] = src[i]; + } + + return (wide_string_t){ concat, len1 + len2 + 1 }; +} + +/** + * Parse a string literal and set lexer_token. + */ +static void parse_string_literal(void) +{ + const unsigned start_linenr = lexer_token.source_position.linenr; + + eat('"'); + + int tc; while(1) { switch(c) { - SKIP_TRIGRAPHS(, - obstack_1grow(&symbol_obstack, '?'); - next_char(); - break; - ) - case '\\': - next_char(); - EAT_NEWLINE(break;) - int ec = parse_escape_sequence(); - obstack_1grow(&symbol_obstack, ec); + tc = parse_escape_sequence(); + obstack_1grow(&symbol_obstack, (char) tc); break; - case EOF: - error_prefix_at(source_position.input_name, start_linenr); - fprintf(stderr, "string has no end\n"); - token->type = T_ERROR; + case EOF: { + source_position_t source_position; + source_position.input_name = lexer_token.source_position.input_name; + source_position.linenr = start_linenr; + errorf(&source_position, "string has no end"); + lexer_token.type = T_ERROR; return; + } case '"': next_char(); goto end_of_string; default: - obstack_1grow(&symbol_obstack, c); + obstack_1grow(&symbol_obstack, (char) c); next_char(); break; } @@ -438,50 +894,40 @@ 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(&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; } -#define MATCH_NEWLINE(code) \ - case '\r': \ - next_char(); \ - if(c == '\n') { \ - next_char(); \ - } \ - source_position.linenr++; \ - code; \ - case '\n': \ - next_char(); \ - source_position.linenr++; \ - code; - -static -void parse_character_constant(token_t *token) +/** + * Parse a wide character constant and set lexer_token. + */ +static void parse_wide_character_constant(void) { - assert(c == '\''); - next_char(); + const unsigned start_linenr = lexer_token.source_position.linenr; + + eat('\''); - int found_char = 0; while(1) { switch(c) { - SKIP_TRIGRAPHS(, - found_char = '?'; - break; - ) - - case '\\': - next_char(); - EAT_NEWLINE(break;) - found_char = '\\'; + case '\\': { + wchar_rep_t tc = parse_escape_sequence(); + obstack_grow(&symbol_obstack, &tc, sizeof(tc)); break; + } MATCH_NEWLINE( parse_error("newline while parsing character constant"); @@ -490,117 +936,188 @@ void parse_character_constant(token_t *token) case '\'': next_char(); - goto end_of_char_constant; + goto end_of_wide_char_constant; - case EOF: - parse_error("EOF while parsing character constant"); - token->type = T_ERROR; + case EOF: { + source_position_t source_position = lexer_token.source_position; + source_position.linenr = start_linenr; + errorf(&source_position, "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_char_constant; - } else { - found_char = c; - next_char(); - } + default: { + wchar_rep_t tc = (wchar_rep_t) c; + obstack_grow(&symbol_obstack, &tc, sizeof(tc)); + next_char(); break; } + } } -end_of_char_constant: - token->type = T_INTEGER; - token->v.intvalue = found_char; +end_of_wide_char_constant:; + size_t size = (size_t) obstack_object_size(&symbol_obstack); + assert(size % sizeof(wchar_rep_t) == 0); + size /= sizeof(wchar_rep_t); + + const wchar_rep_t *string = obstack_finish(&symbol_obstack); + + lexer_token.type = T_WIDE_CHARACTER_CONSTANT; + lexer_token.v.wide_string.begin = string; + lexer_token.v.wide_string.size = size; + lexer_token.datatype = type_wchar_t; } -static -void skip_multiline_comment(void) +/** + * Parse a wide string literal and set lexer_token. + */ +static void parse_wide_string_literal(void) { - unsigned start_linenr = source_position.linenr; - int had_star = 0; + const unsigned start_linenr = lexer_token.source_position.linenr; + + assert(c == '"'); + next_char(); while(1) { switch(c) { - case '*': - next_char(); - had_star = 1; + case '\\': { + wchar_rep_t tc = parse_escape_sequence(); + obstack_grow(&symbol_obstack, &tc, sizeof(tc)); break; + } - case '/': + case EOF: { + source_position_t source_position; + source_position.input_name = lexer_token.source_position.input_name; + source_position.linenr = start_linenr; + errorf(&source_position, "string has no end"); + lexer_token.type = T_ERROR; + return; + } + + case '"': next_char(); - if(had_star) { - return; - } - had_star = 0; - break; + goto end_of_string; - case '\\': + default: { + wchar_rep_t tc = c; + obstack_grow(&symbol_obstack, &tc, sizeof(tc)); next_char(); - EAT_NEWLINE(break;) - had_star = 0; break; + } + } + } - case '?': - next_char(); - if(c != '?') { - had_star = 0; - break; - } - next_char(); - if(replace_trigraph()) - break; - put_back(c); - c = '?'; - had_star = 0; - /* we don't put back the 2nd ? as the comment text is discarded - * anyway */ +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; +} + +/** + * Parse a character constant and set lexer_token. + */ +static void parse_character_constant(void) +{ + const unsigned start_linenr = lexer_token.source_position.linenr; + + eat('\''); + + while(1) { + switch(c) { + case '\\': { + int tc = parse_escape_sequence(); + obstack_1grow(&symbol_obstack, (char) tc); break; + } - MATCH_NEWLINE(had_star = 0; break;) + MATCH_NEWLINE( + parse_error("newline while parsing character constant"); + break; + ) - case EOF: - error_prefix_at(source_position.input_name, start_linenr); - fprintf(stderr, "at end of file while looking for comment end\n"); + case '\'': + next_char(); + goto end_of_char_constant; + + case EOF: { + source_position_t source_position; + source_position.input_name = lexer_token.source_position.input_name; + source_position.linenr = start_linenr; + errorf(&source_position, "EOF while parsing character constant"); + lexer_token.type = T_ERROR; return; + } + default: - had_star = 0; + obstack_1grow(&symbol_obstack, (char) c); next_char(); break; + } } + +end_of_char_constant:; + const size_t size = (size_t)obstack_object_size(&symbol_obstack); + const char *const string = obstack_finish(&symbol_obstack); + + lexer_token.type = T_CHARACTER_CONSTANT; + lexer_token.v.string.begin = string; + lexer_token.v.string.size = size; + lexer_token.datatype = type_int; } -static -void skip_line_comment(void) +/** + * Skip a multiline comment. + */ +static void skip_multiline_comment(void) { + unsigned start_linenr = lexer_token.source_position.linenr; + while(1) { switch(c) { - case '?': - next_char(); - if(c != '?') - break; + case '/': next_char(); - if(replace_trigraph()) - break; - put_back('?'); - /* we don't put back the 2nd ? as the comment text is discarded - * anyway */ + if (c == '*') { + /* TODO: nested comment, warn here */ + } break; - - case '\\': + case '*': next_char(); - if(c == '\n') { + if(c == '/') { next_char(); - source_position.linenr++; + return; } break; - case EOF: - case '\r': - case '\n': + MATCH_NEWLINE(break;) + + case EOF: { + source_position_t source_position; + source_position.input_name = lexer_token.source_position.input_name; + source_position.linenr = start_linenr; + errorf(&source_position, "at end of file while looking for comment end"); return; + } default: next_char(); @@ -609,81 +1126,181 @@ void skip_line_comment(void) } } -static -void lexer_next_preprocessing_token(token_t *token); +/** + * Skip a single line comment. + */ +static void skip_line_comment(void) +{ + while(1) { + switch(c) { + case EOF: + return; -static token_t pp_token; + case '\n': + case '\r': + return; -static inline -void next_pp_token(void) -{ - lexer_next_preprocessing_token(&pp_token); + default: + next_char(); + break; + } + } } -static -void eat_until_newline(void) +/** The current preprocessor token. */ +static token_t pp_token; + +/** + * Read the next preprocessor token. + */ +static inline void next_pp_token(void) { - /* TODO */ + lexer_next_preprocessing_token(); + pp_token = lexer_token; } -static -void error_directive(void) +/** + * Eat all preprocessor tokens until newline. + */ +static void eat_until_newline(void) { - error_prefix(); - fprintf(stderr, "#error directive: \n"); - - /* parse pp-tokens until new-line */ + while(pp_token.type != '\n' && pp_token.type != T_EOF) { + next_pp_token(); + } } -static -void define_directive(void) +/** + * Handle the define directive. + */ +static void define_directive(void) { - token_t temptoken; - - lexer_next_preprocessing_token(&temptoken); - if(temptoken.type != T_IDENTIFIER) { + lexer_next_preprocessing_token(); + if(lexer_token.type != T_IDENTIFIER) { parse_error("expected identifier after #define\n"); eat_until_newline(); } } -static -void ifdef_directive(int is_ifndef) +/** + * Handle the ifdef directive. + */ +static void ifdef_directive(int is_ifndef) { (void) is_ifndef; - token_t temptoken; - lexer_next_preprocessing_token(&temptoken); + lexer_next_preprocessing_token(); //expect_identifier(); //extect_newline(); } -static -void endif_directive(void) +/** + * Handle the endif directive. + */ +static void endif_directive(void) { //expect_newline(); } -static -void parse_line_directive(void) +/** + * Parse the line directive. + */ +static void parse_line_directive(void) { if(pp_token.type != T_INTEGER) { parse_error("expected integer"); } else { - 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) { - source_position.input_name = pp_token.v.string; + lexer_token.source_position.input_name = pp_token.v.string.begin; next_pp_token(); } - while(pp_token.type != T_EOF && pp_token.type != '\n') { - next_pp_token(); + eat_until_newline(); +} + +/** + * STDC pragmas. + */ +typedef enum { + STDC_UNKNOWN, + STDC_FP_CONTRACT, + STDC_FENV_ACCESS, + STDC_CX_LIMITED_RANGE +} stdc_pragma_kind_t; + +/** + * STDC pragma values. + */ +typedef enum { + STDC_VALUE_UNKNOWN, + STDC_VALUE_ON, + STDC_VALUE_OFF, + STDC_VALUE_DEFAULT +} stdc_pragma_value_kind_t; + +/** + * Parse a pragma directive. + */ +static void parse_pragma(void) { + bool unknown_pragma = true; + + next_pp_token(); + if (pp_token.v.symbol->pp_ID == TP_STDC) { + stdc_pragma_kind_t kind = STDC_UNKNOWN; + /* a STDC pragma */ + if (c_mode & _C99) { + next_pp_token(); + + switch (pp_token.v.symbol->pp_ID) { + case TP_FP_CONTRACT: + kind = STDC_FP_CONTRACT; + break; + case TP_FENV_ACCESS: + kind = STDC_FENV_ACCESS; + break; + case TP_CX_LIMITED_RANGE: + kind = STDC_CX_LIMITED_RANGE; + break; + default: + break; + } + if (kind != STDC_UNKNOWN) { + stdc_pragma_value_kind_t value = STDC_VALUE_UNKNOWN; + next_pp_token(); + switch (pp_token.v.symbol->pp_ID) { + case TP_ON: + value = STDC_VALUE_ON; + break; + case TP_OFF: + value = STDC_VALUE_OFF; + break; + case TP_DEFAULT: + value = STDC_VALUE_DEFAULT; + break; + default: + break; + } + if (value != STDC_VALUE_UNKNOWN) { + unknown_pragma = false; + } else { + errorf(&pp_token.source_position, "bad STDC pragma argument"); + } + } + } + } else { + unknown_pragma = true; + } + eat_until_newline(); + if (unknown_pragma && warning.unknown_pragmas) { + warningf(&pp_token.source_position, "encountered unknown #pragma"); } } -static -void parse_preprocessor_identifier(void) +/** + * Parse a preprocessor non-null directive. + */ +static void parse_preprocessor_identifier(void) { assert(pp_token.type == T_IDENTIFIER); symbol_t *symbol = pp_token.v.symbol; @@ -713,15 +1330,19 @@ void parse_preprocessor_identifier(void) case TP_elif: case TP_undef: case TP_error: - error_directive(); + /* TODO; output the rest of the line */ + parse_error("#error directive: "); break; case TP_pragma: + parse_pragma(); break; } } -static -void parse_preprocessor_directive(token_t *result_token) +/** + * Parse a preprocessor directive. + */ +static void parse_preprocessor_directive(void) { next_pp_token(); @@ -732,9 +1353,14 @@ void parse_preprocessor_directive(token_t *result_token) case T_INTEGER: parse_line_directive(); break; + case '\n': + /* NULL directive, see § 6.10.7 */ + break; + default: + parse_error("invalid preprocessor directive"); + eat_until_newline(); + break; } - - lexer_next_token(result_token); } #define MAYBE_PROLOG \ @@ -745,100 +1371,23 @@ void parse_preprocessor_directive(token_t *result_token) #define MAYBE(ch, set_type) \ case ch: \ next_char(); \ - token->type = set_type; \ + lexer_token.type = set_type; \ return; #define ELSE_CODE(code) \ - SKIP_TRIGRAPHS(, \ - code; \ - ) \ - \ - case '\\': \ - next_char(); \ - EAT_NEWLINE(break;) \ - /* fallthrough */ \ default: \ - code; \ + code \ } \ } /* end of while(1) */ \ break; #define ELSE(set_type) \ ELSE_CODE( \ - token->type = set_type; \ + lexer_token.type = set_type; \ return; \ ) -static -void eat_whitespace() -{ - while(1) { - switch(c) { - case ' ': - case '\t': - next_char(); - break; - - case '\r': - case '\n': - return; - - case '\\': - next_char(); - if(c == '\n') { - next_char(); - source_position.linenr++; - break; - } - - put_back(c); - c = '\\'; - return; - - SKIP_TRIGRAPHS(, - return; - ) - - case '/': - next_char(); - while(1) { - switch(c) { - case '*': - next_char(); - skip_multiline_comment(); - eat_whitespace(); - return; - case '/': - next_char(); - skip_line_comment(); - eat_whitespace(); - return; - - SKIP_TRIGRAPHS( - put_back('?'); - , - c = '/'; - return; - ) - - case '\\': - next_char(); - EAT_NEWLINE(break;) - /* fallthrough */ - default: - return; - } - } - break; - - default: - return; - } - } -} - -static -void lexer_next_preprocessing_token(token_t *token) +void lexer_next_preprocessing_token(void) { while(1) { switch(c) { @@ -848,62 +1397,59 @@ void lexer_next_preprocessing_token(token_t *token) break; MATCH_NEWLINE( - eat_whitespace(); - if(c == '#') { - next_char(); - parse_preprocessor_directive(token); - return; - } - token->type = '\n'; + lexer_token.type = '\n'; return; ) SYMBOL_CHARS - parse_symbol(token); + 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; - case '0': - case '1': - case '2': - case '3': - case '4': - case '5': - case '6': - case '7': - case '8': - case '9': - parse_number(token); + DIGITS + parse_number(); return; case '"': - parse_string_literal(token); + parse_string_literal(); return; case '\'': - parse_character_constant(token); - return; - - case '\\': - next_char(); - if(c == '\n') { - next_char(); - source_position.linenr++; - break; - } else { - parse_error("unexpected '\\' found"); - token->type = T_ERROR; - } + 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(c); c = '.'; - token->type = '.'; + lexer_token.type = '.'; return; ) ELSE('.') @@ -923,6 +1469,7 @@ void lexer_next_preprocessing_token(token_t *token) ELSE('+') case '-': MAYBE_PROLOG + MAYBE('>', T_MINUSGREATER) MAYBE('-', T_MINUSMINUS) MAYBE('=', T_MINUSEQUAL) ELSE('-') @@ -936,35 +1483,36 @@ void lexer_next_preprocessing_token(token_t *token) case '*': next_char(); skip_multiline_comment(); - lexer_next_preprocessing_token(token); + lexer_next_preprocessing_token(); return; case '/': next_char(); skip_line_comment(); - lexer_next_preprocessing_token(token); + lexer_next_preprocessing_token(); return; ELSE('/') case '%': MAYBE_PROLOG - MAYBE('>', T_PERCENTGREATER) + MAYBE('>', '}') MAYBE('=', T_PERCENTEQUAL) case ':': MAYBE_PROLOG case '%': MAYBE_PROLOG - MAYBE(':', T_PERCENTCOLONPERCENTCOLON) + MAYBE(':', T_HASHHASH) ELSE_CODE( put_back(c); c = '%'; - token->type = T_PERCENTCOLON; + lexer_token.type = '#'; return; ) - ELSE(T_PERCENTCOLON) + ELSE('#') ELSE('%') case '<': MAYBE_PROLOG - MAYBE(':', T_LESSCOLON) - MAYBE('%', T_LESSPERCENT) + MAYBE(':', '[') + MAYBE('%', '{') + MAYBE('=', T_LESSEQUAL) case '<': MAYBE_PROLOG MAYBE('=', T_LESSLESSEQUAL) @@ -972,6 +1520,7 @@ void lexer_next_preprocessing_token(token_t *token) ELSE('<') case '>': MAYBE_PROLOG + MAYBE('=', T_GREATEREQUAL) case '>': MAYBE_PROLOG MAYBE('=', T_GREATERGREATEREQUAL) @@ -988,7 +1537,7 @@ void lexer_next_preprocessing_token(token_t *token) ELSE('|') case ':': MAYBE_PROLOG - MAYBE('>', T_COLONGREATER) + MAYBE('>', ']') ELSE(':') case '=': MAYBE_PROLOG @@ -1000,22 +1549,6 @@ void lexer_next_preprocessing_token(token_t *token) ELSE('#') case '?': - next_char(); - /* just a simple ? */ - if(c != '?') { - token->type = '?'; - return; - } - /* might be a trigraph */ - next_char(); - if(replace_trigraph()) { - break; - } - put_back(c); - c = '?'; - token->type = '?'; - return; - case '[': case ']': case '(': @@ -1025,29 +1558,39 @@ void lexer_next_preprocessing_token(token_t *token) case '~': case ';': case ',': - token->type = c; + case '\\': + lexer_token.type = c; next_char(); return; case EOF: - token->type = T_EOF; + lexer_token.type = T_EOF; return; default: next_char(); - error_prefix(); - fprintf(stderr, "unknown character '%c' found\n", c); - token->type = T_ERROR; + errorf(&lexer_token.source_position, "unknown character '%c' found\n", c); + lexer_token.type = T_ERROR; return; } } } -void lexer_next_token(token_t *token) +void lexer_next_token(void) { + lexer_next_preprocessing_token(); + if(lexer_token.type != '\n') + return; + +newline_found: do { - lexer_next_preprocessing_token(token); - } while(token->type == '\n'); + lexer_next_preprocessing_token(); + } while(lexer_token.type == '\n'); + + if(lexer_token.type == '#') { + parse_preprocessor_directive(); + goto newline_found; + } } void init_lexer(void) @@ -1057,12 +1600,16 @@ void init_lexer(void) void lexer_open_stream(FILE *stream, const char *input_name) { - input = stream; - source_position.linenr = 0; - source_position.input_name = input_name; + input = stream; + lexer_token.source_position.linenr = 0; + lexer_token.source_position.input_name = input_name; + + 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 */ + /* place a virtual \n at the beginning so the lexer knows that we're + * at the beginning of a line */ c = '\n'; } @@ -1074,6 +1621,7 @@ void exit_lexer(void) 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); }