1 | /* Part of CPP library. |
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2 | Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 |
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3 | Free Software Foundation, Inc. |
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4 | |
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5 | This program is free software; you can redistribute it and/or modify it |
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6 | under the terms of the GNU General Public License as published by the |
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7 | Free Software Foundation; either version 2, or (at your option) any |
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8 | later version. |
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9 | |
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10 | This program is distributed in the hope that it will be useful, |
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11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 | GNU General Public License for more details. |
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14 | |
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15 | You should have received a copy of the GNU General Public License |
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16 | along with this program; if not, write to the Free Software |
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17 | Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
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18 | |
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19 | /* This header defines all the internal data structures and functions |
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20 | that need to be visible across files. It's called cpphash.h for |
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21 | historical reasons. */ |
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22 | |
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23 | #ifndef GCC_CPPHASH_H |
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24 | #define GCC_CPPHASH_H |
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25 | |
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26 | #include "hashtable.h" |
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27 | |
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28 | struct directive; /* Deliberately incomplete. */ |
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29 | |
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30 | /* Test if a sign is valid within a preprocessing number. */ |
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31 | #define VALID_SIGN(c, prevc) \ |
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32 | (((c) == '+' || (c) == '-') && \ |
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33 | ((prevc) == 'e' || (prevc) == 'E' \ |
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34 | || (((prevc) == 'p' || (prevc) == 'P') \ |
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35 | && CPP_OPTION (pfile, extended_numbers)))) |
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36 | |
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37 | #define CPP_OPTION(PFILE, OPTION) ((PFILE)->opts.OPTION) |
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38 | #define CPP_BUFFER(PFILE) ((PFILE)->buffer) |
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39 | #define CPP_BUF_COLUMN(BUF, CUR) ((CUR) - (BUF)->line_base + (BUF)->col_adjust) |
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40 | #define CPP_BUF_COL(BUF) CPP_BUF_COLUMN(BUF, (BUF)->cur) |
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41 | |
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42 | /* Maximum nesting of cpp_buffers. We use a static limit, partly for |
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43 | efficiency, and partly to limit runaway recursion. */ |
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44 | #define CPP_STACK_MAX 200 |
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45 | |
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46 | /* A generic memory buffer, and operations on it. */ |
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47 | typedef struct _cpp_buff _cpp_buff; |
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48 | struct _cpp_buff |
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49 | { |
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50 | struct _cpp_buff *next; |
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51 | unsigned char *base, *cur, *limit; |
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52 | }; |
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53 | |
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54 | extern _cpp_buff *_cpp_get_buff PARAMS ((cpp_reader *, size_t)); |
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55 | extern void _cpp_release_buff PARAMS ((cpp_reader *, _cpp_buff *)); |
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56 | extern void _cpp_extend_buff PARAMS ((cpp_reader *, _cpp_buff **, size_t)); |
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57 | extern _cpp_buff *_cpp_append_extend_buff PARAMS ((cpp_reader *, _cpp_buff *, |
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58 | size_t)); |
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59 | extern void _cpp_free_buff PARAMS ((_cpp_buff *)); |
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60 | extern unsigned char *_cpp_aligned_alloc PARAMS ((cpp_reader *, size_t)); |
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61 | extern unsigned char *_cpp_unaligned_alloc PARAMS ((cpp_reader *, size_t)); |
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62 | |
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63 | #define BUFF_ROOM(BUFF) (size_t) ((BUFF)->limit - (BUFF)->cur) |
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64 | #define BUFF_FRONT(BUFF) ((BUFF)->cur) |
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65 | #define BUFF_LIMIT(BUFF) ((BUFF)->limit) |
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66 | |
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67 | /* List of directories to look for include files in. */ |
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68 | struct search_path |
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69 | { |
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70 | struct search_path *next; |
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71 | |
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72 | /* NOTE: NAME may not be null terminated for the case of the current |
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73 | file's directory! */ |
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74 | const char *name; |
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75 | unsigned int len; |
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76 | /* We use these to tell if the directory mentioned here is a duplicate |
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77 | of an earlier directory on the search path. */ |
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78 | ino_t ino; |
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79 | dev_t dev; |
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80 | /* Non-zero if it is a system include directory. */ |
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81 | int sysp; |
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82 | /* Mapping of file names for this directory. Only used on MS-DOS |
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83 | and related platforms. */ |
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84 | struct file_name_map *name_map; |
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85 | }; |
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86 | |
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87 | /* #include types. */ |
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88 | enum include_type {IT_INCLUDE, IT_INCLUDE_NEXT, IT_IMPORT, IT_CMDLINE}; |
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89 | |
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90 | union utoken |
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91 | { |
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92 | const cpp_token *token; |
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93 | const cpp_token **ptoken; |
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94 | }; |
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95 | |
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96 | /* A "run" of tokens; part of a chain of runs. */ |
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97 | typedef struct tokenrun tokenrun; |
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98 | struct tokenrun |
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99 | { |
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100 | tokenrun *next, *prev; |
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101 | cpp_token *base, *limit; |
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102 | }; |
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103 | |
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104 | typedef struct cpp_context cpp_context; |
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105 | struct cpp_context |
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106 | { |
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107 | /* Doubly-linked list. */ |
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108 | cpp_context *next, *prev; |
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109 | |
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110 | /* Contexts other than the base context are contiguous tokens. |
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111 | e.g. macro expansions, expanded argument tokens. */ |
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112 | union utoken first; |
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113 | union utoken last; |
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114 | |
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115 | /* If non-NULL, a buffer used for storage related to this context. |
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116 | When the context is popped, the buffer is released. */ |
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117 | _cpp_buff *buff; |
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118 | |
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119 | /* For a macro context, the macro node, otherwise NULL. */ |
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120 | cpp_hashnode *macro; |
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121 | |
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122 | /* True if utoken element is token, else ptoken. */ |
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123 | bool direct_p; |
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124 | }; |
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125 | |
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126 | struct lexer_state |
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127 | { |
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128 | /* Nonzero if first token on line is CPP_HASH. */ |
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129 | unsigned char in_directive; |
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130 | |
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131 | /* True if we are skipping a failed conditional group. */ |
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132 | unsigned char skipping; |
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133 | |
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134 | /* Nonzero if in a directive that takes angle-bracketed headers. */ |
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135 | unsigned char angled_headers; |
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136 | |
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137 | /* Nonzero to save comments. Turned off if discard_comments, and in |
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138 | all directives apart from #define. */ |
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139 | unsigned char save_comments; |
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140 | |
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141 | /* Nonzero if we're mid-comment. */ |
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142 | unsigned char lexing_comment; |
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143 | |
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144 | /* Nonzero if lexing __VA_ARGS__ is valid. */ |
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145 | unsigned char va_args_ok; |
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146 | |
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147 | /* Nonzero if lexing poisoned identifiers is valid. */ |
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148 | unsigned char poisoned_ok; |
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149 | |
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150 | /* Nonzero to prevent macro expansion. */ |
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151 | unsigned char prevent_expansion; |
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152 | |
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153 | /* Nonzero when parsing arguments to a function-like macro. */ |
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154 | unsigned char parsing_args; |
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155 | }; |
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156 | |
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157 | /* Special nodes - identifiers with predefined significance. */ |
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158 | struct spec_nodes |
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159 | { |
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160 | cpp_hashnode *n_defined; /* defined operator */ |
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161 | cpp_hashnode *n_true; /* C++ keyword true */ |
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162 | cpp_hashnode *n_false; /* C++ keyword false */ |
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163 | cpp_hashnode *n__STRICT_ANSI__; /* STDC_0_IN_SYSTEM_HEADERS */ |
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164 | cpp_hashnode *n__VA_ARGS__; /* C99 vararg macros */ |
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165 | }; |
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166 | |
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167 | /* Represents the contents of a file cpplib has read in. */ |
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168 | struct cpp_buffer |
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169 | { |
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170 | const unsigned char *cur; /* current position */ |
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171 | const unsigned char *backup_to; /* if peeked character is not wanted */ |
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172 | const unsigned char *rlimit; /* end of valid data */ |
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173 | const unsigned char *line_base; /* start of current line */ |
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174 | |
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175 | struct cpp_buffer *prev; |
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176 | |
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177 | const unsigned char *buf; /* Entire character buffer. */ |
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178 | |
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179 | /* Pointer into the include table; non-NULL if this is a file |
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180 | buffer. Used for include_next and to record control macros. */ |
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181 | struct include_file *inc; |
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182 | |
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183 | /* Value of if_stack at start of this file. |
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184 | Used to prohibit unmatched #endif (etc) in an include file. */ |
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185 | struct if_stack *if_stack; |
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186 | |
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187 | /* Token column position adjustment owing to tabs in whitespace. */ |
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188 | unsigned int col_adjust; |
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189 | |
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190 | /* Contains PREV_WHITE and/or AVOID_LPASTE. */ |
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191 | unsigned char saved_flags; |
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192 | |
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193 | /* Because of the way the lexer works, -Wtrigraphs can sometimes |
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194 | warn twice for the same trigraph. This helps prevent that. */ |
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195 | const unsigned char *last_Wtrigraphs; |
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196 | |
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197 | /* True if we have already warned about C++ comments in this file. |
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198 | The warning happens only for C89 extended mode with -pedantic on, |
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199 | or for -Wtraditional, and only once per file (otherwise it would |
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200 | be far too noisy). */ |
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201 | unsigned char warned_cplusplus_comments; |
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202 | |
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203 | /* True if we don't process trigraphs and escaped newlines. True |
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204 | for preprocessed input, command line directives, and _Pragma |
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205 | buffers. */ |
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206 | unsigned char from_stage3; |
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207 | |
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208 | /* Nonzero means that the directory to start searching for "" |
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209 | include files has been calculated and stored in "dir" below. */ |
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210 | unsigned char search_cached; |
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211 | |
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212 | /* At EOF, a buffer is automatically popped. If RETURN_AT_EOF is |
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213 | true, a CPP_EOF token is then returned. Otherwise, the next |
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214 | token from the enclosing buffer is returned. */ |
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215 | bool return_at_eof; |
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216 | |
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217 | /* The directory of the this buffer's file. Its NAME member is not |
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218 | allocated, so we don't need to worry about freeing it. */ |
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219 | struct search_path dir; |
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220 | }; |
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221 | |
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222 | /* A cpp_reader encapsulates the "state" of a pre-processor run. |
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223 | Applying cpp_get_token repeatedly yields a stream of pre-processor |
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224 | tokens. Usually, there is only one cpp_reader object active. */ |
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225 | struct cpp_reader |
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226 | { |
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227 | /* Top of buffer stack. */ |
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228 | cpp_buffer *buffer; |
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229 | |
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230 | /* Lexer state. */ |
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231 | struct lexer_state state; |
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232 | |
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233 | /* Source line tracking. */ |
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234 | struct line_maps line_maps; |
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235 | const struct line_map *map; |
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236 | unsigned int line; |
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237 | |
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238 | /* The line of the '#' of the current directive. */ |
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239 | unsigned int directive_line; |
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240 | |
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241 | /* Memory buffers. */ |
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242 | _cpp_buff *a_buff; /* Aligned permanent storage. */ |
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243 | _cpp_buff *u_buff; /* Unaligned permanent storage. */ |
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244 | _cpp_buff *free_buffs; /* Free buffer chain. */ |
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245 | |
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246 | /* Context stack. */ |
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247 | struct cpp_context base_context; |
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248 | struct cpp_context *context; |
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249 | |
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250 | /* If in_directive, the directive if known. */ |
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251 | const struct directive *directive; |
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252 | |
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253 | /* Multiple inlcude optimisation. */ |
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254 | const cpp_hashnode *mi_cmacro; |
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255 | const cpp_hashnode *mi_ind_cmacro; |
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256 | bool mi_valid; |
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257 | |
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258 | /* Lexing. */ |
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259 | cpp_token *cur_token; |
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260 | tokenrun base_run, *cur_run; |
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261 | unsigned int lookaheads; |
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262 | |
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263 | /* Non-zero prevents the lexer from re-using the token runs. */ |
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264 | unsigned int keep_tokens; |
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265 | |
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266 | /* Error counter for exit code. */ |
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267 | unsigned int errors; |
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268 | |
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269 | /* Line and column where a newline was first seen in a string |
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270 | constant (multi-line strings). */ |
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271 | unsigned int mls_line; |
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272 | unsigned int mls_col; |
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273 | |
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274 | /* Buffer to hold macro definition string. */ |
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275 | unsigned char *macro_buffer; |
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276 | unsigned int macro_buffer_len; |
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277 | |
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278 | /* Tree of other included files. See cppfiles.c. */ |
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279 | struct splay_tree_s *all_include_files; |
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280 | |
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281 | /* Current maximum length of directory names in the search path |
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282 | for include files. (Altered as we get more of them.) */ |
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283 | unsigned int max_include_len; |
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284 | |
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285 | /* Date and time tokens. Calculated together if either is requested. */ |
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286 | cpp_token date; |
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287 | cpp_token time; |
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288 | |
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289 | /* EOF token, and a token forcing paste avoidance. */ |
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290 | cpp_token avoid_paste; |
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291 | cpp_token eof; |
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292 | |
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293 | /* Opaque handle to the dependencies of mkdeps.c. Used by -M etc. */ |
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294 | struct deps *deps; |
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295 | |
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296 | /* Obstack holding all macro hash nodes. This never shrinks. |
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297 | See cpphash.c */ |
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298 | struct obstack hash_ob; |
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299 | |
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300 | /* Obstack holding buffer and conditional structures. This is a |
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301 | real stack. See cpplib.c. */ |
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302 | struct obstack buffer_ob; |
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303 | |
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304 | /* Pragma table - dynamic, because a library user can add to the |
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305 | list of recognized pragmas. */ |
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306 | struct pragma_entry *pragmas; |
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307 | |
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308 | /* Call backs. */ |
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309 | struct cpp_callbacks cb; |
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310 | |
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311 | /* Identifier hash table. */ |
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312 | struct ht *hash_table; |
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313 | |
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314 | /* User visible options. */ |
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315 | struct cpp_options opts; |
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316 | |
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317 | /* Special nodes - identifiers with predefined significance to the |
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318 | preprocessor. */ |
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319 | struct spec_nodes spec_nodes; |
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320 | |
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321 | /* Whether to print our version number. Done this way so |
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322 | we don't get it twice for -v -version. */ |
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323 | unsigned char print_version; |
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324 | |
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325 | /* Whether cpplib owns the hashtable. */ |
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326 | unsigned char our_hashtable; |
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327 | }; |
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328 | |
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329 | /* Character classes. Based on the more primitive macros in safe-ctype.h. |
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330 | If the definition of `numchar' looks odd to you, please look up the |
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331 | definition of a pp-number in the C standard [section 6.4.8 of C99]. |
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332 | |
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333 | In the unlikely event that characters other than \r and \n enter |
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334 | the set is_vspace, the macro handle_newline() in cpplex.c must be |
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335 | updated. */ |
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336 | #define _dollar_ok(x) ((x) == '$' && CPP_OPTION (pfile, dollars_in_ident)) |
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337 | |
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338 | #define is_idchar(x) (ISIDNUM(x) || _dollar_ok(x)) |
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339 | #define is_numchar(x) ISIDNUM(x) |
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340 | #define is_idstart(x) (ISIDST(x) || _dollar_ok(x)) |
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341 | #define is_numstart(x) ISDIGIT(x) |
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342 | #define is_hspace(x) ISBLANK(x) |
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343 | #define is_vspace(x) IS_VSPACE(x) |
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344 | #define is_nvspace(x) IS_NVSPACE(x) |
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345 | #define is_space(x) IS_SPACE_OR_NUL(x) |
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346 | |
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347 | /* This table is constant if it can be initialized at compile time, |
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348 | which is the case if cpp was compiled with GCC >=2.7, or another |
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349 | compiler that supports C99. */ |
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350 | #if HAVE_DESIGNATED_INITIALIZERS |
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351 | extern const unsigned char _cpp_trigraph_map[UCHAR_MAX + 1]; |
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352 | #else |
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353 | extern unsigned char _cpp_trigraph_map[UCHAR_MAX + 1]; |
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354 | #endif |
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355 | |
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356 | /* Macros. */ |
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357 | |
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358 | #define CPP_PRINT_DEPS(PFILE) CPP_OPTION (PFILE, print_deps) |
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359 | #define CPP_IN_SYSTEM_HEADER(PFILE) ((PFILE)->map && (PFILE)->map->sysp) |
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360 | #define CPP_PEDANTIC(PF) CPP_OPTION (PF, pedantic) |
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361 | #define CPP_WTRADITIONAL(PF) CPP_OPTION (PF, warn_traditional) |
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362 | |
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363 | /* In cpperror.c */ |
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364 | enum error_type { WARNING = 0, WARNING_SYSHDR, PEDWARN, ERROR, FATAL, ICE }; |
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365 | extern int _cpp_begin_message PARAMS ((cpp_reader *, enum error_type, |
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366 | unsigned int, unsigned int)); |
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367 | |
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368 | /* In cppmacro.c */ |
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369 | extern void _cpp_free_definition PARAMS ((cpp_hashnode *)); |
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370 | extern int _cpp_create_definition PARAMS ((cpp_reader *, cpp_hashnode *)); |
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371 | extern void _cpp_pop_context PARAMS ((cpp_reader *)); |
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372 | |
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373 | /* In cpphash.c */ |
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374 | extern void _cpp_init_hashtable PARAMS ((cpp_reader *, hash_table *)); |
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375 | extern void _cpp_destroy_hashtable PARAMS ((cpp_reader *)); |
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376 | |
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377 | /* In cppfiles.c */ |
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378 | extern void _cpp_fake_include PARAMS ((cpp_reader *, const char *)); |
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379 | extern void _cpp_never_reread PARAMS ((struct include_file *)); |
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380 | extern char *_cpp_simplify_pathname PARAMS ((char *)); |
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381 | extern bool _cpp_read_file PARAMS ((cpp_reader *, const char *)); |
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382 | extern bool _cpp_execute_include PARAMS ((cpp_reader *, |
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383 | const cpp_token *, |
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384 | enum include_type)); |
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385 | extern int _cpp_compare_file_date PARAMS ((cpp_reader *, |
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386 | const cpp_token *)); |
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387 | extern void _cpp_report_missing_guards PARAMS ((cpp_reader *)); |
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388 | extern void _cpp_init_includes PARAMS ((cpp_reader *)); |
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389 | extern void _cpp_cleanup_includes PARAMS ((cpp_reader *)); |
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390 | extern bool _cpp_pop_file_buffer PARAMS ((cpp_reader *, |
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391 | struct include_file *)); |
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392 | |
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393 | /* In cppexp.c */ |
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394 | extern int _cpp_parse_expr PARAMS ((cpp_reader *)); |
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395 | |
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396 | /* In cpplex.c */ |
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397 | extern cpp_token *_cpp_temp_token PARAMS ((cpp_reader *)); |
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398 | extern const cpp_token *_cpp_lex_token PARAMS ((cpp_reader *)); |
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399 | extern cpp_token *_cpp_lex_direct PARAMS ((cpp_reader *)); |
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400 | extern int _cpp_equiv_tokens PARAMS ((const cpp_token *, |
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401 | const cpp_token *)); |
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402 | extern void _cpp_init_tokenrun PARAMS ((tokenrun *, unsigned int)); |
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403 | |
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404 | /* In cppinit.c. */ |
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405 | extern bool _cpp_push_next_buffer PARAMS ((cpp_reader *)); |
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406 | |
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407 | /* In cpplib.c */ |
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408 | extern int _cpp_test_assertion PARAMS ((cpp_reader *, int *)); |
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409 | extern int _cpp_handle_directive PARAMS ((cpp_reader *, int)); |
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410 | extern void _cpp_define_builtin PARAMS ((cpp_reader *, const char *)); |
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411 | extern void _cpp_do__Pragma PARAMS ((cpp_reader *)); |
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412 | extern void _cpp_init_directives PARAMS ((cpp_reader *)); |
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413 | extern void _cpp_init_internal_pragmas PARAMS ((cpp_reader *)); |
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414 | extern void _cpp_do_file_change PARAMS ((cpp_reader *, enum lc_reason, |
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415 | const char *, |
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416 | unsigned int, unsigned int)); |
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417 | extern void _cpp_pop_buffer PARAMS ((cpp_reader *)); |
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418 | |
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419 | /* Utility routines and macros. */ |
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420 | #define DSC(str) (const U_CHAR *)str, sizeof str - 1 |
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421 | #define xnew(T) (T *) xmalloc (sizeof(T)) |
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422 | #define xcnew(T) (T *) xcalloc (1, sizeof(T)) |
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423 | #define xnewvec(T, N) (T *) xmalloc (sizeof(T) * (N)) |
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424 | #define xcnewvec(T, N) (T *) xcalloc (N, sizeof(T)) |
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425 | #define xobnew(O, T) (T *) obstack_alloc (O, sizeof(T)) |
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426 | |
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427 | /* These are inline functions instead of macros so we can get type |
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428 | checking. */ |
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429 | typedef unsigned char U_CHAR; |
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430 | #define U (const U_CHAR *) /* Intended use: U"string" */ |
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431 | |
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432 | static inline int ustrcmp PARAMS ((const U_CHAR *, const U_CHAR *)); |
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433 | static inline int ustrncmp PARAMS ((const U_CHAR *, const U_CHAR *, |
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434 | size_t)); |
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435 | static inline size_t ustrlen PARAMS ((const U_CHAR *)); |
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436 | static inline U_CHAR *uxstrdup PARAMS ((const U_CHAR *)); |
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437 | static inline U_CHAR *ustrchr PARAMS ((const U_CHAR *, int)); |
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438 | static inline int ufputs PARAMS ((const U_CHAR *, FILE *)); |
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439 | |
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440 | static inline int |
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441 | ustrcmp (s1, s2) |
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442 | const U_CHAR *s1, *s2; |
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443 | { |
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444 | return strcmp ((const char *)s1, (const char *)s2); |
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445 | } |
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446 | |
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447 | static inline int |
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448 | ustrncmp (s1, s2, n) |
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449 | const U_CHAR *s1, *s2; |
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450 | size_t n; |
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451 | { |
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452 | return strncmp ((const char *)s1, (const char *)s2, n); |
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453 | } |
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454 | |
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455 | static inline size_t |
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456 | ustrlen (s1) |
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457 | const U_CHAR *s1; |
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458 | { |
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459 | return strlen ((const char *)s1); |
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460 | } |
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461 | |
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462 | static inline U_CHAR * |
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463 | uxstrdup (s1) |
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464 | const U_CHAR *s1; |
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465 | { |
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466 | return (U_CHAR *) xstrdup ((const char *)s1); |
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467 | } |
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468 | |
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469 | static inline U_CHAR * |
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470 | ustrchr (s1, c) |
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471 | const U_CHAR *s1; |
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472 | int c; |
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473 | { |
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474 | return (U_CHAR *) strchr ((const char *)s1, c); |
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475 | } |
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476 | |
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477 | static inline int |
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478 | ufputs (s, f) |
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479 | const U_CHAR *s; |
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480 | FILE *f; |
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481 | { |
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482 | return fputs ((const char *)s, f); |
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483 | } |
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484 | |
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485 | #endif /* ! GCC_CPPHASH_H */ |
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