Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-diagnostic.c @ 158:494b0b89df80 default tip
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| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Mon, 25 May 2020 18:13:55 +0900 |
| parents | 1830386684a0 |
| children |
| rev | line source |
|---|---|
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1 /* Language-independent diagnostic subroutines for the GNU Compiler |
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2 Collection that are only for use in the compilers proper and not |
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3 the driver or other programs. |
| 145 | 4 Copyright (C) 1999-2020 Free Software Foundation, Inc. |
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5 |
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6 This file is part of GCC. |
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7 |
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8 GCC is free software; you can redistribute it and/or modify it under |
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9 the terms of the GNU General Public License as published by the Free |
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10 Software Foundation; either version 3, or (at your option) any later |
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11 version. |
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12 |
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13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
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14 WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with GCC; see the file COPYING3. If not see |
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20 <http://www.gnu.org/licenses/>. */ |
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21 |
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22 #include "config.h" |
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23 #include "system.h" |
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24 #include "coretypes.h" |
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25 #include "tree.h" |
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26 #include "diagnostic.h" |
| 111 | 27 #include "tree-pretty-print.h" |
| 28 #include "gimple-pretty-print.h" | |
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29 #include "tree-diagnostic.h" |
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30 #include "langhooks.h" |
| 111 | 31 #include "intl.h" |
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32 |
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33 /* Prints out, if necessary, the name of the current function |
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34 that caused an error. Called from all error and warning functions. */ |
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35 void |
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36 diagnostic_report_current_function (diagnostic_context *context, |
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37 diagnostic_info *diagnostic) |
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38 { |
| 111 | 39 diagnostic_report_current_module (context, diagnostic_location (diagnostic)); |
| 40 lang_hooks.print_error_function (context, LOCATION_FILE (input_location), | |
| 41 diagnostic); | |
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42 } |
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43 |
| 111 | 44 static void |
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45 default_tree_diagnostic_starter (diagnostic_context *context, |
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46 diagnostic_info *diagnostic) |
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47 { |
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48 diagnostic_report_current_function (context, diagnostic); |
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49 pp_set_prefix (context->printer, diagnostic_build_prefix (context, |
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50 diagnostic)); |
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51 } |
| 111 | 52 |
| 53 /* This is a pair made of a location and the line map it originated | |
| 54 from. It's used in the maybe_unwind_expanded_macro_loc function | |
| 55 below. */ | |
| 56 struct loc_map_pair | |
| 57 { | |
| 58 const line_map_macro *map; | |
| 145 | 59 location_t where; |
| 111 | 60 }; |
| 61 | |
| 62 | |
| 63 /* Unwind the different macro expansions that lead to the token which | |
| 64 location is WHERE and emit diagnostics showing the resulting | |
| 65 unwound macro expansion trace. Let's look at an example to see how | |
| 66 the trace looks like. Suppose we have this piece of code, | |
| 67 artificially annotated with the line numbers to increase | |
| 68 legibility: | |
| 69 | |
| 70 $ cat -n test.c | |
| 71 1 #define OPERATE(OPRD1, OPRT, OPRD2) \ | |
| 72 2 OPRD1 OPRT OPRD2; | |
| 73 3 | |
| 74 4 #define SHIFTL(A,B) \ | |
| 75 5 OPERATE (A,<<,B) | |
| 76 6 | |
| 77 7 #define MULT(A) \ | |
| 78 8 SHIFTL (A,1) | |
| 79 9 | |
| 80 10 void | |
| 81 11 g () | |
| 82 12 { | |
| 83 13 MULT (1.0);// 1.0 << 1; <-- so this is an error. | |
| 84 14 } | |
| 85 | |
| 86 Here is the diagnostic that we want the compiler to generate: | |
| 87 | |
| 88 test.c: In function ‘g’: | |
| 89 test.c:5:14: error: invalid operands to binary << (have ‘double’ and ‘int’) | |
| 90 test.c:2:9: note: in definition of macro 'OPERATE' | |
| 91 test.c:8:3: note: in expansion of macro 'SHIFTL' | |
| 92 test.c:13:3: note: in expansion of macro 'MULT' | |
| 93 | |
| 94 The part that goes from the third to the fifth line of this | |
| 95 diagnostic (the lines containing the 'note:' string) is called the | |
| 96 unwound macro expansion trace. That's the part generated by this | |
| 97 function. */ | |
| 98 | |
| 145 | 99 void |
| 111 | 100 maybe_unwind_expanded_macro_loc (diagnostic_context *context, |
| 145 | 101 location_t where) |
| 111 | 102 { |
| 103 const struct line_map *map; | |
| 104 auto_vec<loc_map_pair> loc_vec; | |
| 105 unsigned ix; | |
| 106 loc_map_pair loc, *iter; | |
| 107 | |
| 145 | 108 const location_t original_loc = where; |
| 109 | |
| 111 | 110 map = linemap_lookup (line_table, where); |
| 111 if (!linemap_macro_expansion_map_p (map)) | |
| 112 return; | |
| 113 | |
| 114 /* Let's unwind the macros that got expanded and led to the token | |
| 115 which location is WHERE. We are going to store these macros into | |
| 116 LOC_VEC, so that we can later walk it at our convenience to | |
| 117 display a somewhat meaningful trace of the macro expansion | |
| 118 history to the user. Note that the first macro of the trace | |
| 119 (which is OPERATE in the example above) is going to be stored at | |
| 120 the beginning of LOC_VEC. */ | |
| 121 | |
| 122 do | |
| 123 { | |
| 124 loc.where = where; | |
| 125 loc.map = linemap_check_macro (map); | |
| 126 | |
| 127 loc_vec.safe_push (loc); | |
| 128 | |
| 129 /* WHERE is the location of a token inside the expansion of a | |
| 130 macro. MAP is the map holding the locations of that macro | |
| 131 expansion. Let's get the location of the token inside the | |
| 132 context that triggered the expansion of this macro. | |
| 133 This is basically how we go "down" in the trace of macro | |
| 134 expansions that led to WHERE. */ | |
| 135 where = linemap_unwind_toward_expansion (line_table, where, &map); | |
| 136 } while (linemap_macro_expansion_map_p (map)); | |
| 137 | |
| 138 /* Now map is set to the map of the location in the source that | |
| 139 first triggered the macro expansion. This must be an ordinary map. */ | |
| 140 const line_map_ordinary *ord_map = linemap_check_ordinary (map); | |
| 141 | |
| 142 /* Walk LOC_VEC and print the macro expansion trace, unless the | |
| 143 first macro which expansion triggered this trace was expanded | |
| 144 inside a system header. */ | |
| 145 int saved_location_line = | |
| 145 | 146 expand_location_to_spelling_point (original_loc).line; |
| 111 | 147 |
| 148 if (!LINEMAP_SYSP (ord_map)) | |
| 149 FOR_EACH_VEC_ELT (loc_vec, ix, iter) | |
| 150 { | |
| 151 /* Sometimes, in the unwound macro expansion trace, we want to | |
| 152 print a part of the context that shows where, in the | |
| 153 definition of the relevant macro, is the token (we are | |
| 154 looking at) used. That is the case in the introductory | |
| 155 comment of this function, where we print: | |
| 156 | |
| 157 test.c:2:9: note: in definition of macro 'OPERATE'. | |
| 158 | |
| 159 We print that "macro definition context" because the | |
| 160 diagnostic line (emitted by the call to | |
| 161 pp_ouput_formatted_text in diagnostic_report_diagnostic): | |
| 162 | |
| 163 test.c:5:14: error: invalid operands to binary << (have ‘double’ and ‘int’) | |
| 164 | |
| 165 does not point into the definition of the macro where the | |
| 166 token '<<' (that is an argument to the function-like macro | |
| 167 OPERATE) is used. So we must "display" the line of that | |
| 168 macro definition context to the user somehow. | |
| 169 | |
| 170 A contrario, when the first interesting diagnostic line | |
| 171 points into the definition of the macro, we don't need to | |
| 172 display any line for that macro definition in the trace | |
| 173 anymore, otherwise it'd be redundant. */ | |
| 174 | |
| 175 /* Okay, now here is what we want. For each token resulting | |
| 176 from macro expansion we want to show: 1/ where in the | |
| 177 definition of the macro the token comes from; 2/ where the | |
| 178 macro got expanded. */ | |
| 179 | |
| 180 /* Resolve the location iter->where into the locus 1/ of the | |
| 181 comment above. */ | |
| 145 | 182 location_t resolved_def_loc = |
| 111 | 183 linemap_resolve_location (line_table, iter->where, |
| 184 LRK_MACRO_DEFINITION_LOCATION, NULL); | |
| 185 | |
| 186 /* Don't print trace for locations that are reserved or from | |
| 187 within a system header. */ | |
| 188 const line_map_ordinary *m = NULL; | |
| 145 | 189 location_t l = |
| 111 | 190 linemap_resolve_location (line_table, resolved_def_loc, |
| 191 LRK_SPELLING_LOCATION, &m); | |
| 192 if (l < RESERVED_LOCATION_COUNT || LINEMAP_SYSP (m)) | |
| 193 continue; | |
| 194 | |
| 195 /* We need to print the context of the macro definition only | |
| 196 when the locus of the first displayed diagnostic (displayed | |
| 197 before this trace) was inside the definition of the | |
| 198 macro. */ | |
| 199 int resolved_def_loc_line = SOURCE_LINE (m, l); | |
| 200 if (ix == 0 && saved_location_line != resolved_def_loc_line) | |
| 201 { | |
| 202 diagnostic_append_note (context, resolved_def_loc, | |
| 203 "in definition of macro %qs", | |
| 204 linemap_map_get_macro_name (iter->map)); | |
| 205 /* At this step, as we've printed the context of the macro | |
| 206 definition, we don't want to print the context of its | |
| 207 expansion, otherwise, it'd be redundant. */ | |
| 208 continue; | |
| 209 } | |
| 210 | |
| 211 /* Resolve the location of the expansion point of the macro | |
| 212 which expansion gave the token represented by def_loc. | |
| 213 This is the locus 2/ of the earlier comment. */ | |
| 145 | 214 location_t resolved_exp_loc = |
| 111 | 215 linemap_resolve_location (line_table, |
| 216 MACRO_MAP_EXPANSION_POINT_LOCATION (iter->map), | |
| 217 LRK_MACRO_DEFINITION_LOCATION, NULL); | |
| 218 | |
| 219 diagnostic_append_note (context, resolved_exp_loc, | |
| 220 "in expansion of macro %qs", | |
| 221 linemap_map_get_macro_name (iter->map)); | |
| 222 } | |
| 223 } | |
| 224 | |
| 225 /* This is a diagnostic finalizer implementation that is aware of | |
| 226 virtual locations produced by libcpp. | |
| 227 | |
| 228 It has to be called by the diagnostic finalizer of front ends that | |
| 229 uses libcpp and wish to get diagnostics involving tokens resulting | |
| 230 from macro expansion. | |
| 231 | |
| 232 For a given location, if said location belongs to a token | |
| 233 resulting from a macro expansion, this starter prints the context | |
| 234 of the token. E.g, for multiply nested macro expansion, it | |
| 235 unwinds the nested macro expansions and prints them in a manner | |
| 236 that is similar to what is done for function call stacks, or | |
| 237 template instantiation contexts. */ | |
| 238 void | |
| 239 virt_loc_aware_diagnostic_finalizer (diagnostic_context *context, | |
| 240 diagnostic_info *diagnostic) | |
| 241 { | |
| 145 | 242 maybe_unwind_expanded_macro_loc (context, diagnostic_location (diagnostic)); |
| 111 | 243 } |
| 244 | |
| 245 /* Default tree printer. Handles declarations only. */ | |
| 246 bool | |
| 247 default_tree_printer (pretty_printer *pp, text_info *text, const char *spec, | |
| 248 int precision, bool wide, bool set_locus, bool hash, | |
| 131 | 249 bool *, const char **) |
| 111 | 250 { |
| 251 tree t; | |
| 252 | |
| 253 /* FUTURE: %+x should set the locus. */ | |
| 254 if (precision != 0 || wide || hash) | |
| 255 return false; | |
| 256 | |
| 257 switch (*spec) | |
| 258 { | |
| 259 case 'E': | |
| 260 t = va_arg (*text->args_ptr, tree); | |
| 261 if (TREE_CODE (t) == IDENTIFIER_NODE) | |
| 262 { | |
| 263 pp_identifier (pp, IDENTIFIER_POINTER (t)); | |
| 264 return true; | |
| 265 } | |
| 266 break; | |
| 267 | |
| 268 case 'D': | |
| 269 t = va_arg (*text->args_ptr, tree); | |
| 270 if (VAR_P (t) && DECL_HAS_DEBUG_EXPR_P (t)) | |
| 271 t = DECL_DEBUG_EXPR (t); | |
| 272 break; | |
| 273 | |
| 274 case 'F': | |
| 275 case 'T': | |
| 276 t = va_arg (*text->args_ptr, tree); | |
| 277 break; | |
| 278 | |
| 279 case 'G': | |
| 280 percent_G_format (text); | |
| 281 return true; | |
| 282 | |
| 283 case 'K': | |
| 284 t = va_arg (*text->args_ptr, tree); | |
| 131 | 285 percent_K_format (text, EXPR_LOCATION (t), TREE_BLOCK (t)); |
| 111 | 286 return true; |
| 287 | |
| 288 default: | |
| 289 return false; | |
| 290 } | |
| 291 | |
| 292 if (set_locus) | |
| 131 | 293 text->set_location (0, DECL_SOURCE_LOCATION (t), SHOW_RANGE_WITH_CARET); |
| 111 | 294 |
| 295 if (DECL_P (t)) | |
| 296 { | |
| 297 const char *n = DECL_NAME (t) | |
| 298 ? identifier_to_locale (lang_hooks.decl_printable_name (t, 2)) | |
| 299 : _("<anonymous>"); | |
| 300 pp_string (pp, n); | |
| 301 } | |
| 302 else | |
| 303 dump_generic_node (pp, t, 0, TDF_SLIM, 0); | |
| 304 | |
| 305 return true; | |
| 306 } | |
| 307 | |
| 308 /* Sets CONTEXT to use language independent diagnostics. */ | |
| 309 void | |
| 310 tree_diagnostics_defaults (diagnostic_context *context) | |
| 311 { | |
| 312 diagnostic_starter (context) = default_tree_diagnostic_starter; | |
| 313 diagnostic_finalizer (context) = default_diagnostic_finalizer; | |
| 314 diagnostic_format_decoder (context) = default_tree_printer; | |
| 145 | 315 context->print_path = default_tree_diagnostic_path_printer; |
| 316 context->make_json_for_path = default_tree_make_json_for_path; | |
| 111 | 317 } |