+++ /dev/null
-/*
- * This file is part of cparser.
- * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
- *
- * 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 <config.h>
-
-#include "adt/strutil.h"
-#include "input.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 "parser.h"
-#include "warning.h"
-#include "lang_features.h"
-
-#include <assert.h>
-#include <errno.h>
-#include <string.h>
-#include <stdbool.h>
-#include <ctype.h>
-
-#ifndef _WIN32
-#include <strings.h>
-#endif
-
-#define MAX_PUTBACK 16 // 3 would be enough, but 16 gives a nicer alignment
-#define BUF_SIZE 1024
-
-static input_t *input;
-static utf32 input_buf[BUF_SIZE + MAX_PUTBACK];
-static const utf32 *bufpos;
-static const utf32 *bufend;
-static utf32 c;
-static source_position_t lexer_pos;
-token_t lexer_token;
-static symbol_t *symbol_L;
-static strset_t stringset;
-bool allow_dollar_in_symbol = true;
-
-/**
- * Prints a parse error message at the current token.
- *
- * @param msg the error message
- */
-static void parse_error(const char *msg)
-{
- errorf(&lexer_pos, "%s", msg);
-}
-
-/**
- * Prints an internal error message at the current token.
- *
- * @param msg the error message
- */
-static NORETURN internal_error(const char *msg)
-{
- internal_errorf(&lexer_pos, "%s", msg);
-}
-
-static inline void next_real_char(void)
-{
- assert(bufpos <= bufend);
- if (bufpos >= bufend) {
- size_t n = decode(input, input_buf+MAX_PUTBACK, BUF_SIZE);
- if (n == 0) {
- c = EOF;
- return;
- }
- bufpos = input_buf + MAX_PUTBACK;
- bufend = bufpos + n;
- }
- c = *bufpos++;
- ++lexer_pos.colno;
-}
-
-/**
- * Put a character back into the buffer.
- *
- * @param pc the character to put back
- */
-static inline void put_back(utf32 const pc)
-{
- *(--bufpos - input_buf + input_buf) = pc;
- --lexer_pos.colno;
-}
-
-static inline void next_char(void);
-
-#define NEWLINE \
- '\r': \
- next_char(); \
- if (c == '\n') { \
- case '\n': \
- next_char(); \
- } \
- lexer_pos.lineno++; \
- lexer_pos.colno = 1; \
- goto newline; \
- newline // Let it look like an ordinary case label.
-
-#define eat(c_type) (assert(c == c_type), next_char())
-
-static void maybe_concat_lines(void)
-{
- eat('\\');
-
- switch (c) {
- case NEWLINE:
- return;
-
- default:
- break;
- }
-
- put_back(c);
- c = '\\';
-}
-
-/**
- * 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();
- return;
- }
-
- if (LIKELY(c != '?'))
- return;
-
- next_real_char();
- if (LIKELY(c != '?')) {
- put_back(c);
- c = '?';
- return;
- }
-
- 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;
- }
-}
-
-#define SYMBOL_CHARS_WITHOUT_E_P \
- '$': if (!allow_dollar_in_symbol) goto dollar_sign; \
- case 'a': \
- case 'b': \
- case 'c': \
- case 'd': \
- case 'f': \
- case 'g': \
- case 'h': \
- case 'i': \
- case 'j': \
- case 'k': \
- case 'l': \
- case 'm': \
- case 'n': \
- case 'o': \
- 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 'F': \
- case 'G': \
- case 'H': \
- case 'I': \
- case 'J': \
- case 'K': \
- case 'L': \
- case 'M': \
- case 'N': \
- case 'O': \
- case 'Q': \
- case 'R': \
- case 'S': \
- case 'T': \
- case 'U': \
- case 'V': \
- case 'W': \
- case 'X': \
- case 'Y': \
- case 'Z': \
- case '_'
-
-#define SYMBOL_CHARS_E_P \
- 'E': \
- case 'P': \
- case 'e': \
- case 'p'
-
-#define SYMBOL_CHARS \
- SYMBOL_CHARS_WITHOUT_E_P: \
- case SYMBOL_CHARS_E_P
-
-#define DIGITS \
- '0': \
- case '1': \
- case '2': \
- case '3': \
- case '4': \
- case '5': \
- case '6': \
- case '7': \
- case '8': \
- case '9'
-
-static bool is_universal_char_valid(utf32 const v)
-{
- /* C11 ยง6.4.3:2 */
- if (v < 0xA0U && v != 0x24 && v != 0x40 && v != 0x60)
- return false;
- if (0xD800 <= v && v <= 0xDFFF)
- return false;
- return true;
-}
-
-static int digit_value(utf32 digit);
-
-static utf32 parse_universal_char(unsigned const n_digits)
-{
- utf32 v = 0;
- for (unsigned k = n_digits; k != 0; --k) {
- if (isxdigit(c)) {
- v = 16 * v + digit_value(c);
- next_char();
- } else {
- errorf(&lexer_pos, "short universal character name, expected %u more digits", k);
- break;
- }
- }
- if (!is_universal_char_valid(v)) {
- errorf(&lexer_pos, "\\%c%0*X is not a valid universal character name", n_digits == 4 ? 'u' : 'U', (int)n_digits, v);
- }
- return v;
-}
-
-static bool is_universal_char_valid_identifier(utf32 const v)
-{
- /* C11 Annex D.1 */
- if ( v == 0x000A8) return true;
- if ( v == 0x000AA) return true;
- if ( v == 0x000AD) return true;
- if ( v == 0x000AF) return true;
- if (0x000B2 <= v && v <= 0x000B5) return true;
- if (0x000B7 <= v && v <= 0x000BA) return true;
- if (0x000BC <= v && v <= 0x000BE) return true;
- if (0x000C0 <= v && v <= 0x000D6) return true;
- if (0x000D8 <= v && v <= 0x000F6) return true;
- if (0x000F8 <= v && v <= 0x000FF) return true;
- if (0x00100 <= v && v <= 0x0167F) return true;
- if (0x01681 <= v && v <= 0x0180D) return true;
- if (0x0180F <= v && v <= 0x01FFF) return true;
- if (0x0200B <= v && v <= 0x0200D) return true;
- if (0x0202A <= v && v <= 0x0202E) return true;
- if (0x0203F <= v && v <= 0x02040) return true;
- if ( v == 0x02054) return true;
- if (0x02060 <= v && v <= 0x0206F) return true;
- if (0x02070 <= v && v <= 0x0218F) return true;
- if (0x02460 <= v && v <= 0x024FF) return true;
- if (0x02776 <= v && v <= 0x02793) return true;
- if (0x02C00 <= v && v <= 0x02DFF) return true;
- if (0x02E80 <= v && v <= 0x02FFF) return true;
- if (0x03004 <= v && v <= 0x03007) return true;
- if (0x03021 <= v && v <= 0x0302F) return true;
- if (0x03031 <= v && v <= 0x0303F) return true;
- if (0x03040 <= v && v <= 0x0D7FF) return true;
- if (0x0F900 <= v && v <= 0x0FD3D) return true;
- if (0x0FD40 <= v && v <= 0x0FDCF) return true;
- if (0x0FDF0 <= v && v <= 0x0FE44) return true;
- if (0x0FE47 <= v && v <= 0x0FFFD) return true;
- if (0x10000 <= v && v <= 0x1FFFD) return true;
- if (0x20000 <= v && v <= 0x2FFFD) return true;
- if (0x30000 <= v && v <= 0x3FFFD) return true;
- if (0x40000 <= v && v <= 0x4FFFD) return true;
- if (0x50000 <= v && v <= 0x5FFFD) return true;
- if (0x60000 <= v && v <= 0x6FFFD) return true;
- if (0x70000 <= v && v <= 0x7FFFD) return true;
- if (0x80000 <= v && v <= 0x8FFFD) return true;
- if (0x90000 <= v && v <= 0x9FFFD) return true;
- if (0xA0000 <= v && v <= 0xAFFFD) return true;
- if (0xB0000 <= v && v <= 0xBFFFD) return true;
- if (0xC0000 <= v && v <= 0xCFFFD) return true;
- if (0xD0000 <= v && v <= 0xDFFFD) return true;
- if (0xE0000 <= v && v <= 0xEFFFD) return true;
- return false;
-}
-
-static bool is_universal_char_valid_identifier_start(utf32 const v)
-{
- /* C11 Annex D.2 */
- if (0x0300 <= v && v <= 0x036F) return false;
- if (0x1DC0 <= v && v <= 0x1DFF) return false;
- if (0x20D0 <= v && v <= 0x20FF) return false;
- if (0xFE20 <= v && v <= 0xFE2F) return false;
- return true;
-}
-
-/**
- * Read a symbol from the input and build
- * the lexer_token.
- */
-static void parse_symbol(void)
-{
- while (true) {
- switch (c) {
- case DIGITS:
- case SYMBOL_CHARS:
- obstack_1grow(&symbol_obstack, (char) c);
- next_char();
- break;
-
- case '\\':
- next_char();
- switch (c) {
- {
- unsigned n;
- case 'U': n = 8; goto universal;
- case 'u': n = 4; goto universal;
-universal:
- next_char();
- utf32 const v = parse_universal_char(n);
- if (!is_universal_char_valid_identifier(v)) {
- if (is_universal_char_valid(v)) {
- errorf(&lexer_pos, "universal character \\%c%0*X is not valid in an identifier", n == 4 ? 'u' : 'U', (int)n, v);
- }
- } else if (obstack_object_size(&symbol_obstack) == 0 && !is_universal_char_valid_identifier_start(v)) {
- errorf(&lexer_pos, "universal character \\%c%0*X is not valid as start of an identifier", n == 4 ? 'u' : 'U', (int)n, v);
- } else {
- obstack_grow_utf8(&symbol_obstack, v);
- }
- break;
- }
-
- default:
- put_back(c);
- c = '\\';
- goto end_symbol;
- }
-
- default:
-dollar_sign:
- goto end_symbol;
- }
- }
-
-end_symbol:
- obstack_1grow(&symbol_obstack, '\0');
-
- char *string = obstack_finish(&symbol_obstack);
- symbol_t *symbol = symbol_table_insert(string);
-
- lexer_token.kind = symbol->ID;
- lexer_token.base.symbol = symbol;
-
- if (symbol->string != string) {
- obstack_free(&symbol_obstack, string);
- }
-}
-
-static string_t sym_make_string(string_encoding_t const enc)
-{
- obstack_1grow(&symbol_obstack, '\0');
- size_t const len = obstack_object_size(&symbol_obstack) - 1;
- char *const string = obstack_finish(&symbol_obstack);
-
- /* TODO hash */
-#if 0
- const char *result = strset_insert(&stringset, concat);
- if (result != concat) {
- obstack_free(&symbol_obstack, concat);
- }
-#else
- const char *result = string;
-#endif
- return (string_t){ result, len, enc };
-}
-
-static void parse_pp_number(void)
-{
- for (;;) {
- switch (c) {
- case SYMBOL_CHARS_E_P:
- obstack_1grow(&symbol_obstack, (char)c);
- next_char();
- if (c == '+' || c == '-') {
- case '.':
- case DIGITS:
- case SYMBOL_CHARS_WITHOUT_E_P:
- obstack_1grow(&symbol_obstack, (char)c);
- next_char();
- }
- break;
-
- default:
-dollar_sign:
- lexer_token.kind = T_NUMBER;
- lexer_token.literal.string = sym_make_string(STRING_ENCODING_CHAR);
- return;
- }
- }
-}
-
-/**
- * Returns true if the given char is a octal digit.
- *
- * @param char the character to check
- */
-static bool is_octal_digit(utf32 chr)
-{
- return '0' <= chr && chr <= '7';
-}
-
-/**
- * Returns the value of a digit.
- * The only portable way to do it ...
- */
-static int digit_value(utf32 const 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 utf32 parse_octal_sequence(utf32 const first_digit)
-{
- assert(is_octal_digit(first_digit));
- utf32 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();
- return value;
-}
-
-/**
- * Parses a hex character sequence.
- */
-static utf32 parse_hex_sequence(void)
-{
- utf32 value = 0;
- while (isxdigit(c)) {
- value = 16 * value + digit_value(c);
- next_char();
- }
- return value;
-}
-
-/**
- * Parse an escape sequence.
- */
-static utf32 parse_escape_sequence(void)
-{
- eat('\\');
-
- utf32 const 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;
- /* \E is not documented, but handled, by GCC. It is acceptable according
- * to ยง6.11.4, whereas \e is not. */
- case 'E':
- case 'e':
- if (c_mode & _GNUC)
- return 27; /* hopefully 27 is ALWAYS the code for ESCAPE */
- break;
-
- case 'U': return parse_universal_char(8);
- case 'u': return parse_universal_char(4);
-
- default:
- break;
- }
- /* ยง6.4.4.4:8 footnote 64 */
- parse_error("unknown escape sequence");
- return EOF;
-}
-
-string_t make_string(const char *string)
-{
- obstack_grow(&symbol_obstack, string, strlen(string));
- return sym_make_string(STRING_ENCODING_CHAR);
-}
-
-static void parse_string(utf32 const delim, token_kind_t const kind, string_encoding_t const enc, char const *const context)
-{
- eat(delim);
-
- while (true) {
- switch (c) {
- case '\\': {
- utf32 const tc = parse_escape_sequence();
- if (enc == STRING_ENCODING_CHAR) {
- if (tc >= 0x100) {
- warningf(WARN_OTHER, &lexer_pos, "escape sequence out of range");
- }
- obstack_1grow(&symbol_obstack, tc);
- } else {
- obstack_grow_utf8(&symbol_obstack, tc);
- }
- break;
- }
-
- case NEWLINE:
- errorf(&lexer_pos, "newline while parsing %s", context);
- break;
-
- case EOF:
- errorf(&lexer_token.base.source_position, "EOF while parsing %s", context);
- goto end_of_string;
-
- default:
- if (c == delim) {
- next_char();
- goto end_of_string;
- } else {
- obstack_grow_utf8(&symbol_obstack, c);
- next_char();
- break;
- }
- }
- }
-
-end_of_string:
- lexer_token.kind = kind;
- lexer_token.literal.string = sym_make_string(enc);
-}
-
-/**
- * Parse a string literal and set lexer_token.
- */
-static void parse_string_literal(string_encoding_t const enc)
-{
- parse_string('"', T_STRING_LITERAL, enc, "string literal");
-}
-
-/**
- * Parse a character constant and set lexer_token.
- */
-static void parse_character_constant(string_encoding_t const enc)
-{
- parse_string('\'', T_CHARACTER_CONSTANT, enc, "character constant");
- if (lexer_token.literal.string.size == 0) {
- errorf(&lexer_token.base.source_position, "empty character constant");
- }
-}
-
-/**
- * Skip a multiline comment.
- */
-static void skip_multiline_comment(void)
-{
- while (true) {
- switch (c) {
- case '/':
- next_char();
- if (c == '*') {
- /* nested comment, warn here */
- warningf(WARN_COMMENT, &lexer_pos, "'/*' within comment");
- }
- break;
- case '*':
- next_char();
- if (c == '/') {
- next_char();
- return;
- }
- break;
-
- case NEWLINE:
- break;
-
- case EOF: {
- errorf(&lexer_token.base.source_position,
- "at end of file while looking for comment end");
- return;
- }
-
- default:
- next_char();
- break;
- }
- }
-}
-
-/**
- * Skip a single line comment.
- */
-static void skip_line_comment(void)
-{
- while (true) {
- switch (c) {
- case EOF:
- return;
-
- case '\n':
- case '\r':
- return;
-
- case '\\':
- next_char();
- if (c == '\n' || c == '\r') {
- warningf(WARN_COMMENT, &lexer_pos, "multi-line comment");
- return;
- }
- break;
-
- default:
- next_char();
- break;
- }
- }
-}
-
-/** The current preprocessor token. */
-static token_t pp_token;
-
-/**
- * Read the next preprocessor token.
- */
-static inline void next_pp_token(void)
-{
- lexer_next_preprocessing_token();
- pp_token = lexer_token;
-}
-
-/**
- * Eat all preprocessor tokens until newline.
- */
-static void eat_until_newline(void)
-{
- while (pp_token.kind != '\n' && pp_token.kind != T_EOF) {
- next_pp_token();
- }
-}
-
-/**
- * Parse the line directive.
- */
-static void parse_line_directive(void)
-{
- if (pp_token.kind != T_NUMBER) {
- parse_error("expected integer");
- } else {
- /* use offset -1 as this is about the next line */
- char *end;
- long const line = strtol(pp_token.literal.string.begin, &end, 0);
- if (*end == '\0') {
- lexer_pos.lineno = line - 1;
- } else {
- errorf(&lexer_pos, "'%S' is not a valid line number", &pp_token.literal.string);
- }
- next_pp_token();
- }
- if (pp_token.kind == T_STRING_LITERAL && pp_token.literal.string.encoding == STRING_ENCODING_CHAR) {
- lexer_pos.input_name = pp_token.literal.string.begin;
- lexer_pos.is_system_header = false;
- next_pp_token();
-
- /* attempt to parse numeric flags as outputted by gcc preprocessor */
- while (pp_token.kind == T_NUMBER) {
- /* flags:
- * 1 - indicates start of a new file
- * 2 - indicates return from a file
- * 3 - indicates system header
- * 4 - indicates implicit extern "C" in C++ mode
- *
- * currently we're only interested in "3"
- */
- if (streq(pp_token.literal.string.begin, "3")) {
- lexer_pos.is_system_header = true;
- }
- next_pp_token();
- }
- }
-
- eat_until_newline();
-}
-
-/**
- * STDC pragmas.
- */
-typedef enum stdc_pragma_kind_t {
- STDC_UNKNOWN,
- STDC_FP_CONTRACT,
- STDC_FENV_ACCESS,
- STDC_CX_LIMITED_RANGE
-} stdc_pragma_kind_t;
-
-/**
- * STDC pragma values.
- */
-typedef enum stdc_pragma_value_kind_t {
- 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)
-{
- next_pp_token();
- if (pp_token.kind != T_IDENTIFIER) {
- warningf(WARN_UNKNOWN_PRAGMAS, &pp_token.base.source_position,
- "expected identifier after #pragma");
- eat_until_newline();
- return;
- }
-
- stdc_pragma_kind_t kind = STDC_UNKNOWN;
- if (pp_token.base.symbol->pp_ID == TP_STDC && c_mode & _C99) {
- /* a STDC pragma */
- next_pp_token();
-
- switch (pp_token.base.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) {
- next_pp_token();
- stdc_pragma_value_kind_t value;
- switch (pp_token.base.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: value = STDC_VALUE_UNKNOWN; break;
- }
- if (value == STDC_VALUE_UNKNOWN) {
- kind = STDC_UNKNOWN;
- errorf(&pp_token.base.source_position, "bad STDC pragma argument");
- }
- }
- }
- eat_until_newline();
- if (kind == STDC_UNKNOWN) {
- warningf(WARN_UNKNOWN_PRAGMAS, &pp_token.base.source_position,
- "encountered unknown #pragma");
- }
-}
-
-/**
- * Parse a preprocessor non-null directive.
- */
-static void parse_preprocessor_identifier(void)
-{
- assert(pp_token.kind == T_IDENTIFIER);
- switch (pp_token.base.symbol->pp_ID) {
- case TP_line:
- next_pp_token();
- parse_line_directive();
- break;
- case TP_pragma:
- parse_pragma();
- break;
- case TP_error:
- /* TODO; output the rest of the line */
- parse_error("#error directive");
- break;
- }
-}
-
-/**
- * Parse a preprocessor directive.
- */
-static void parse_preprocessor_directive(void)
-{
- next_pp_token();
-
- switch (pp_token.kind) {
- case T_IDENTIFIER:
- parse_preprocessor_identifier();
- break;
- case T_NUMBER:
- parse_line_directive();
- break;
- case '\n':
- /* NULL directive, see ยง6.10.7 */
- break;
- default:
- parse_error("invalid preprocessor directive");
- eat_until_newline();
- break;
- }
-}
-
-#define MAYBE_PROLOG \
- next_char(); \
- while (true) { \
- switch (c) {
-
-#define MAYBE(ch, set_type) \
- case ch: \
- next_char(); \
- lexer_token.kind = set_type; \
- return;
-
-/* must use this as last thing */
-#define MAYBE_MODE(ch, set_type, mode) \
- case ch: \
- if (c_mode & mode) { \
- next_char(); \
- lexer_token.kind = set_type; \
- return; \
- } \
- /* fallthrough */
-
-#define ELSE_CODE(code) \
- default: \
- code \
- return; \
- } \
- } /* end of while (true) */ \
-
-#define ELSE(set_type) \
- ELSE_CODE( \
- lexer_token.kind = set_type; \
- )
-
-void lexer_next_preprocessing_token(void)
-{
- while (true) {
- lexer_token.base.source_position = lexer_pos;
- lexer_token.base.symbol = NULL;
-
- switch (c) {
- case ' ':
- case '\t':
- next_char();
- break;
-
- case NEWLINE:
- lexer_token.kind = '\n';
- return;
-
- case SYMBOL_CHARS: {
- parse_symbol();
- /* might be a wide string ( L"string" ) */
- string_encoding_t const enc = STRING_ENCODING_WIDE;
- if (lexer_token.base.symbol == symbol_L) {
- switch (c) {
- case '"': parse_string_literal(enc); break;
- case '\'': parse_character_constant(enc); break;
- }
- }
- return;
- }
-
- case DIGITS:
- parse_pp_number();
- return;
-
- case '"':
- parse_string_literal(STRING_ENCODING_CHAR);
- return;
-
- case '\'':
- parse_character_constant(STRING_ENCODING_CHAR);
- return;
-
- case '.':
- MAYBE_PROLOG
- case DIGITS:
- put_back(c);
- c = '.';
- parse_pp_number();
- return;
-
- case '.':
- MAYBE_PROLOG
- MAYBE('.', T_DOTDOTDOT)
- ELSE_CODE(
- put_back(c);
- c = '.';
- lexer_token.kind = '.';
- )
- ELSE('.')
- case '&':
- MAYBE_PROLOG
- MAYBE('&', T_ANDAND)
- MAYBE('=', T_ANDEQUAL)
- ELSE('&')
- case '*':
- MAYBE_PROLOG
- MAYBE('=', T_ASTERISKEQUAL)
- ELSE('*')
- case '+':
- MAYBE_PROLOG
- MAYBE('+', T_PLUSPLUS)
- MAYBE('=', T_PLUSEQUAL)
- ELSE('+')
- case '-':
- MAYBE_PROLOG
- MAYBE('>', T_MINUSGREATER)
- MAYBE('-', T_MINUSMINUS)
- MAYBE('=', T_MINUSEQUAL)
- ELSE('-')
- case '!':
- MAYBE_PROLOG
- MAYBE('=', T_EXCLAMATIONMARKEQUAL)
- ELSE('!')
- case '/':
- MAYBE_PROLOG
- MAYBE('=', T_SLASHEQUAL)
- case '*':
- next_char();
- skip_multiline_comment();
- lexer_next_preprocessing_token();
- return;
- case '/':
- next_char();
- skip_line_comment();
- lexer_next_preprocessing_token();
- return;
- ELSE('/')
- case '%':
- MAYBE_PROLOG
- MAYBE('>', '}')
- MAYBE('=', T_PERCENTEQUAL)
- case ':':
- MAYBE_PROLOG
- case '%':
- MAYBE_PROLOG
- MAYBE(':', T_HASHHASH)
- ELSE_CODE(
- put_back(c);
- c = '%';
- lexer_token.kind = '#';
- )
- ELSE('#')
- ELSE('%')
- case '<':
- MAYBE_PROLOG
- MAYBE(':', '[')
- MAYBE('%', '{')
- MAYBE('=', T_LESSEQUAL)
- case '<':
- MAYBE_PROLOG
- MAYBE('=', T_LESSLESSEQUAL)
- ELSE(T_LESSLESS)
- ELSE('<')
- case '>':
- MAYBE_PROLOG
- MAYBE('=', T_GREATEREQUAL)
- case '>':
- MAYBE_PROLOG
- MAYBE('=', T_GREATERGREATEREQUAL)
- ELSE(T_GREATERGREATER)
- ELSE('>')
- case '^':
- MAYBE_PROLOG
- MAYBE('=', T_CARETEQUAL)
- ELSE('^')
- case '|':
- MAYBE_PROLOG
- MAYBE('=', T_PIPEEQUAL)
- MAYBE('|', T_PIPEPIPE)
- ELSE('|')
- case ':':
- MAYBE_PROLOG
- MAYBE('>', ']')
- MAYBE_MODE(':', T_COLONCOLON, _CXX)
- ELSE(':')
- case '=':
- MAYBE_PROLOG
- MAYBE('=', T_EQUALEQUAL)
- ELSE('=')
- case '#':
- MAYBE_PROLOG
- MAYBE('#', T_HASHHASH)
- ELSE('#')
-
- case '\\':
- next_char();
- if (c == 'U' || c == 'u') {
- put_back(c);
- c = '\\';
- parse_symbol();
- } else {
- lexer_token.kind = '\\';
- }
- return;
-
- case '?':
- case '[':
- case ']':
- case '(':
- case ')':
- case '{':
- case '}':
- case '~':
- case ';':
- case ',':
- lexer_token.kind = c;
- next_char();
- return;
-
- case EOF:
- lexer_token.kind = T_EOF;
- return;
-
- default:
-dollar_sign:
- errorf(&lexer_pos, "unknown character '%lc' found", c);
- next_char();
- break;
- }
- }
-}
-
-void lexer_next_token(void)
-{
- lexer_next_preprocessing_token();
-
- while (lexer_token.kind == '\n') {
-newline_found:
- lexer_next_preprocessing_token();
- }
-
- if (lexer_token.kind == '#') {
- parse_preprocessor_directive();
- goto newline_found;
- }
-}
-
-void init_lexer(void)
-{
- strset_init(&stringset);
- symbol_L = symbol_table_insert("L");
-}
-
-static void input_error(unsigned delta_lines, unsigned delta_cols,
- const char *message)
-{
- lexer_pos.lineno += delta_lines;
- lexer_pos.colno += delta_cols;
- errorf(&lexer_pos, "%s", message);
-}
-
-void lexer_switch_input(input_t *new_input, const char *input_name)
-{
- lexer_pos.lineno = 0;
- lexer_pos.colno = 0;
- lexer_pos.input_name = input_name;
-
- set_input_error_callback(input_error);
- input = new_input;
- bufpos = NULL;
- bufend = NULL;
-
- /* 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)
-{
- strset_destroy(&stringset);
-}
-
-static __attribute__((unused))
-void dbg_pos(const source_position_t source_position)
-{
- fprintf(stdout, "%s:%u:%u\n", source_position.input_name,
- source_position.lineno, (unsigned)source_position.colno);
- fflush(stdout);
-}
projects / cparser / commitdiff