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bb2ec1b3 TT |
1 | /* C language support for compilation. |
2 | ||
32d0add0 | 3 | Copyright (C) 2014-2015 Free Software Foundation, Inc. |
bb2ec1b3 TT |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "compile-internal.h" | |
22 | #include "compile.h" | |
23 | #include "gdb-dlfcn.h" | |
24 | #include "c-lang.h" | |
25 | #include "macrotab.h" | |
26 | #include "macroscope.h" | |
27 | #include "regcache.h" | |
28 | ||
29 | /* See compile-internal.h. */ | |
30 | ||
31 | const char * | |
32 | c_get_mode_for_size (int size) | |
33 | { | |
34 | const char *mode = NULL; | |
35 | ||
36 | switch (size) | |
37 | { | |
38 | case 1: | |
39 | mode = "QI"; | |
40 | break; | |
41 | case 2: | |
42 | mode = "HI"; | |
43 | break; | |
44 | case 4: | |
45 | mode = "SI"; | |
46 | break; | |
47 | case 8: | |
48 | mode = "DI"; | |
49 | break; | |
50 | default: | |
51 | internal_error (__FILE__, __LINE__, _("Invalid GCC mode size %d."), size); | |
52 | } | |
53 | ||
54 | return mode; | |
55 | } | |
56 | ||
57 | /* See compile-internal.h. */ | |
58 | ||
59 | char * | |
60 | c_get_range_decl_name (const struct dynamic_prop *prop) | |
61 | { | |
62 | return xstrprintf ("__gdb_prop_%s", host_address_to_string (prop)); | |
63 | } | |
64 | ||
65 | \f | |
66 | ||
67 | #define STR(x) #x | |
68 | #define STRINGIFY(x) STR(x) | |
69 | ||
70 | /* Helper function for c_get_compile_context. Open the GCC front-end | |
71 | shared library and return the symbol specified by the current | |
72 | GCC_C_FE_CONTEXT. */ | |
73 | ||
74 | static gcc_c_fe_context_function * | |
75 | load_libcc (void) | |
76 | { | |
77 | void *handle; | |
78 | gcc_c_fe_context_function *func; | |
79 | ||
80 | /* gdb_dlopen will call error () on an error, so no need to check | |
81 | value. */ | |
82 | handle = gdb_dlopen (STRINGIFY (GCC_C_FE_LIBCC)); | |
83 | func = (gcc_c_fe_context_function *) gdb_dlsym (handle, | |
84 | STRINGIFY (GCC_C_FE_CONTEXT)); | |
85 | ||
86 | if (func == NULL) | |
87 | error (_("could not find symbol %s in library %s"), | |
88 | STRINGIFY (GCC_C_FE_CONTEXT), | |
89 | STRINGIFY (GCC_C_FE_LIBCC)); | |
90 | return func; | |
91 | } | |
92 | ||
93 | /* Return the compile instance associated with the current context. | |
94 | This function calls the symbol returned from the load_libcc | |
95 | function. This will provide the gcc_c_context. */ | |
96 | ||
97 | struct compile_instance * | |
98 | c_get_compile_context (void) | |
99 | { | |
100 | static gcc_c_fe_context_function *func; | |
101 | ||
102 | struct gcc_c_context *context; | |
103 | ||
104 | if (func == NULL) | |
105 | { | |
106 | func = load_libcc (); | |
107 | gdb_assert (func != NULL); | |
108 | } | |
109 | ||
110 | context = (*func) (GCC_FE_VERSION_0, GCC_C_FE_VERSION_0); | |
111 | if (context == NULL) | |
112 | error (_("The loaded version of GCC does not support the required version " | |
113 | "of the API.")); | |
114 | ||
115 | return new_compile_instance (context); | |
116 | } | |
117 | ||
118 | \f | |
119 | ||
120 | /* Write one macro definition. */ | |
121 | ||
122 | static void | |
123 | print_one_macro (const char *name, const struct macro_definition *macro, | |
124 | struct macro_source_file *source, int line, | |
125 | void *user_data) | |
126 | { | |
9a3c8263 | 127 | struct ui_file *file = (struct ui_file *) user_data; |
bb2ec1b3 TT |
128 | |
129 | /* Don't print command-line defines. They will be supplied another | |
130 | way. */ | |
131 | if (line == 0) | |
132 | return; | |
133 | ||
3a9558c4 JK |
134 | /* None of -Wno-builtin-macro-redefined, #undef first |
135 | or plain #define of the same value would avoid a warning. */ | |
136 | fprintf_filtered (file, "#ifndef %s\n# define %s", name, name); | |
bb2ec1b3 TT |
137 | |
138 | if (macro->kind == macro_function_like) | |
139 | { | |
140 | int i; | |
141 | ||
142 | fputs_filtered ("(", file); | |
143 | for (i = 0; i < macro->argc; i++) | |
144 | { | |
145 | fputs_filtered (macro->argv[i], file); | |
146 | if (i + 1 < macro->argc) | |
147 | fputs_filtered (", ", file); | |
148 | } | |
149 | fputs_filtered (")", file); | |
150 | } | |
151 | ||
3a9558c4 | 152 | fprintf_filtered (file, " %s\n#endif\n", macro->replacement); |
bb2ec1b3 TT |
153 | } |
154 | ||
155 | /* Write macro definitions at PC to FILE. */ | |
156 | ||
157 | static void | |
158 | write_macro_definitions (const struct block *block, CORE_ADDR pc, | |
159 | struct ui_file *file) | |
160 | { | |
161 | struct macro_scope *scope; | |
162 | ||
163 | if (block != NULL) | |
164 | scope = sal_macro_scope (find_pc_line (pc, 0)); | |
165 | else | |
166 | scope = default_macro_scope (); | |
167 | if (scope == NULL) | |
168 | scope = user_macro_scope (); | |
169 | ||
170 | if (scope != NULL && scope->file != NULL && scope->file->table != NULL) | |
171 | macro_for_each_in_scope (scope->file, scope->line, print_one_macro, file); | |
172 | } | |
173 | ||
174 | /* Helper function to construct a header scope for a block of code. | |
175 | Takes a scope argument which selects the correct header to | |
176 | insert into BUF. */ | |
177 | ||
178 | static void | |
179 | add_code_header (enum compile_i_scope_types type, struct ui_file *buf) | |
180 | { | |
181 | switch (type) | |
182 | { | |
183 | case COMPILE_I_SIMPLE_SCOPE: | |
184 | fputs_unfiltered ("void " | |
185 | GCC_FE_WRAPPER_FUNCTION | |
186 | " (struct " | |
187 | COMPILE_I_SIMPLE_REGISTER_STRUCT_TAG | |
188 | " *" | |
189 | COMPILE_I_SIMPLE_REGISTER_ARG_NAME | |
190 | ") {\n", | |
191 | buf); | |
192 | break; | |
36de76f9 JK |
193 | case COMPILE_I_PRINT_ADDRESS_SCOPE: |
194 | case COMPILE_I_PRINT_VALUE_SCOPE: | |
195 | /* <string.h> is needed for a memcpy call below. */ | |
196 | fputs_unfiltered ("#include <string.h>\n" | |
197 | "void " | |
198 | GCC_FE_WRAPPER_FUNCTION | |
199 | " (struct " | |
200 | COMPILE_I_SIMPLE_REGISTER_STRUCT_TAG | |
201 | " *" | |
202 | COMPILE_I_SIMPLE_REGISTER_ARG_NAME | |
203 | ", " | |
204 | COMPILE_I_PRINT_OUT_ARG_TYPE | |
205 | " " | |
206 | COMPILE_I_PRINT_OUT_ARG | |
207 | ") {\n", | |
208 | buf); | |
209 | break; | |
210 | ||
bb2ec1b3 TT |
211 | case COMPILE_I_RAW_SCOPE: |
212 | break; | |
213 | default: | |
214 | gdb_assert_not_reached (_("Unknown compiler scope reached.")); | |
215 | } | |
216 | } | |
217 | ||
218 | /* Helper function to construct a footer scope for a block of code. | |
219 | Takes a scope argument which selects the correct footer to | |
220 | insert into BUF. */ | |
221 | ||
222 | static void | |
223 | add_code_footer (enum compile_i_scope_types type, struct ui_file *buf) | |
224 | { | |
225 | switch (type) | |
226 | { | |
227 | case COMPILE_I_SIMPLE_SCOPE: | |
36de76f9 JK |
228 | case COMPILE_I_PRINT_ADDRESS_SCOPE: |
229 | case COMPILE_I_PRINT_VALUE_SCOPE: | |
bb2ec1b3 TT |
230 | fputs_unfiltered ("}\n", buf); |
231 | break; | |
232 | case COMPILE_I_RAW_SCOPE: | |
233 | break; | |
234 | default: | |
235 | gdb_assert_not_reached (_("Unknown compiler scope reached.")); | |
236 | } | |
237 | } | |
238 | ||
239 | /* Generate a structure holding all the registers used by the function | |
240 | we're generating. */ | |
241 | ||
242 | static void | |
243 | generate_register_struct (struct ui_file *stream, struct gdbarch *gdbarch, | |
244 | const unsigned char *registers_used) | |
245 | { | |
246 | int i; | |
247 | int seen = 0; | |
248 | ||
249 | fputs_unfiltered ("struct " COMPILE_I_SIMPLE_REGISTER_STRUCT_TAG " {\n", | |
250 | stream); | |
251 | ||
252 | if (registers_used != NULL) | |
253 | for (i = 0; i < gdbarch_num_regs (gdbarch); ++i) | |
254 | { | |
255 | if (registers_used[i]) | |
256 | { | |
257 | struct type *regtype = check_typedef (register_type (gdbarch, i)); | |
258 | char *regname = compile_register_name_mangled (gdbarch, i); | |
259 | struct cleanup *cleanups = make_cleanup (xfree, regname); | |
260 | ||
261 | seen = 1; | |
262 | ||
263 | /* You might think we could use type_print here. However, | |
264 | target descriptions often use types with names like | |
265 | "int64_t", which may not be defined in the inferior | |
266 | (and in any case would not be looked up due to the | |
267 | #pragma business). So, we take a much simpler | |
268 | approach: for pointer- or integer-typed registers, emit | |
269 | the field in the most direct way; and for other | |
270 | register types (typically flags or vectors), emit a | |
271 | maximally-aligned array of the correct size. */ | |
272 | ||
273 | fputs_unfiltered (" ", stream); | |
274 | switch (TYPE_CODE (regtype)) | |
275 | { | |
276 | case TYPE_CODE_PTR: | |
3a9558c4 | 277 | fprintf_filtered (stream, "__gdb_uintptr %s", regname); |
bb2ec1b3 TT |
278 | break; |
279 | ||
280 | case TYPE_CODE_INT: | |
281 | { | |
282 | const char *mode | |
283 | = c_get_mode_for_size (TYPE_LENGTH (regtype)); | |
284 | ||
285 | if (mode != NULL) | |
286 | { | |
287 | if (TYPE_UNSIGNED (regtype)) | |
288 | fputs_unfiltered ("unsigned ", stream); | |
289 | fprintf_unfiltered (stream, | |
290 | "int %s" | |
291 | " __attribute__ ((__mode__(__%s__)))", | |
292 | regname, | |
293 | mode); | |
294 | break; | |
295 | } | |
296 | } | |
297 | ||
298 | /* Fall through. */ | |
299 | ||
300 | default: | |
301 | fprintf_unfiltered (stream, | |
302 | " unsigned char %s[%d]" | |
303 | " __attribute__((__aligned__(" | |
304 | "__BIGGEST_ALIGNMENT__)))", | |
305 | regname, | |
306 | TYPE_LENGTH (regtype)); | |
307 | } | |
308 | fputs_unfiltered (";\n", stream); | |
309 | ||
310 | do_cleanups (cleanups); | |
311 | } | |
312 | } | |
313 | ||
314 | if (!seen) | |
315 | fputs_unfiltered (" char " COMPILE_I_SIMPLE_REGISTER_DUMMY ";\n", | |
316 | stream); | |
317 | ||
318 | fputs_unfiltered ("};\n\n", stream); | |
319 | } | |
320 | ||
321 | /* Take the source code provided by the user with the 'compile' | |
322 | command, and compute the additional wrapping, macro, variable and | |
323 | register operations needed. INPUT is the source code derived from | |
324 | the 'compile' command, GDBARCH is the architecture to use when | |
325 | computing above, EXPR_BLOCK denotes the block relevant contextually | |
326 | to the inferior when the expression was created, and EXPR_PC | |
327 | indicates the value of $PC. */ | |
328 | ||
329 | char * | |
330 | c_compute_program (struct compile_instance *inst, | |
331 | const char *input, | |
332 | struct gdbarch *gdbarch, | |
333 | const struct block *expr_block, | |
334 | CORE_ADDR expr_pc) | |
335 | { | |
336 | struct ui_file *buf, *var_stream = NULL; | |
337 | char *code; | |
338 | struct cleanup *cleanup; | |
339 | struct compile_c_instance *context = (struct compile_c_instance *) inst; | |
340 | ||
341 | buf = mem_fileopen (); | |
342 | cleanup = make_cleanup_ui_file_delete (buf); | |
343 | ||
344 | write_macro_definitions (expr_block, expr_pc, buf); | |
345 | ||
346 | /* Do not generate local variable information for "raw" | |
347 | compilations. In this case we aren't emitting our own function | |
348 | and the user's code may only refer to globals. */ | |
349 | if (inst->scope != COMPILE_I_RAW_SCOPE) | |
350 | { | |
351 | unsigned char *registers_used; | |
352 | int i; | |
353 | ||
354 | /* Generate the code to compute variable locations, but do it | |
355 | before generating the function header, so we can define the | |
356 | register struct before the function body. This requires a | |
357 | temporary stream. */ | |
358 | var_stream = mem_fileopen (); | |
359 | make_cleanup_ui_file_delete (var_stream); | |
360 | registers_used = generate_c_for_variable_locations (context, | |
361 | var_stream, gdbarch, | |
362 | expr_block, expr_pc); | |
363 | make_cleanup (xfree, registers_used); | |
364 | ||
bb2ec1b3 TT |
365 | fputs_unfiltered ("typedef unsigned int" |
366 | " __attribute__ ((__mode__(__pointer__)))" | |
367 | " __gdb_uintptr;\n", | |
368 | buf); | |
369 | fputs_unfiltered ("typedef int" | |
370 | " __attribute__ ((__mode__(__pointer__)))" | |
371 | " __gdb_intptr;\n", | |
372 | buf); | |
373 | ||
bb2b33b9 | 374 | /* Iterate all log2 sizes in bytes supported by c_get_mode_for_size. */ |
bb2ec1b3 TT |
375 | for (i = 0; i < 4; ++i) |
376 | { | |
377 | const char *mode = c_get_mode_for_size (1 << i); | |
378 | ||
379 | gdb_assert (mode != NULL); | |
380 | fprintf_unfiltered (buf, | |
381 | "typedef int" | |
382 | " __attribute__ ((__mode__(__%s__)))" | |
383 | " __gdb_int_%s;\n", | |
384 | mode, mode); | |
385 | } | |
3a9558c4 JK |
386 | |
387 | generate_register_struct (buf, gdbarch, registers_used); | |
bb2ec1b3 TT |
388 | } |
389 | ||
390 | add_code_header (inst->scope, buf); | |
391 | ||
36de76f9 JK |
392 | if (inst->scope == COMPILE_I_SIMPLE_SCOPE |
393 | || inst->scope == COMPILE_I_PRINT_ADDRESS_SCOPE | |
394 | || inst->scope == COMPILE_I_PRINT_VALUE_SCOPE) | |
bb2ec1b3 TT |
395 | { |
396 | ui_file_put (var_stream, ui_file_write_for_put, buf); | |
397 | fputs_unfiltered ("#pragma GCC user_expression\n", buf); | |
398 | } | |
399 | ||
400 | /* The user expression has to be in its own scope, so that "extern" | |
401 | works properly. Otherwise gcc thinks that the "extern" | |
402 | declaration is in the same scope as the declaration provided by | |
403 | gdb. */ | |
404 | if (inst->scope != COMPILE_I_RAW_SCOPE) | |
405 | fputs_unfiltered ("{\n", buf); | |
406 | ||
407 | fputs_unfiltered ("#line 1 \"gdb command line\"\n", buf); | |
36de76f9 JK |
408 | |
409 | switch (inst->scope) | |
410 | { | |
411 | case COMPILE_I_PRINT_ADDRESS_SCOPE: | |
412 | case COMPILE_I_PRINT_VALUE_SCOPE: | |
413 | fprintf_unfiltered (buf, | |
414 | "__auto_type " COMPILE_I_EXPR_VAL " = %s;\n" | |
415 | "typeof (%s) *" COMPILE_I_EXPR_PTR_TYPE ";\n" | |
416 | "memcpy (" COMPILE_I_PRINT_OUT_ARG ", %s" COMPILE_I_EXPR_VAL ",\n" | |
417 | "sizeof (*" COMPILE_I_EXPR_PTR_TYPE "));\n" | |
418 | , input, input, | |
419 | (inst->scope == COMPILE_I_PRINT_ADDRESS_SCOPE | |
420 | ? "&" : "")); | |
421 | break; | |
422 | default: | |
423 | fputs_unfiltered (input, buf); | |
424 | break; | |
425 | } | |
426 | ||
bb2ec1b3 TT |
427 | fputs_unfiltered ("\n", buf); |
428 | ||
429 | /* For larger user expressions the automatic semicolons may be | |
430 | confusing. */ | |
431 | if (strchr (input, '\n') == NULL) | |
432 | fputs_unfiltered (";\n", buf); | |
433 | ||
434 | if (inst->scope != COMPILE_I_RAW_SCOPE) | |
435 | fputs_unfiltered ("}\n", buf); | |
436 | ||
437 | add_code_footer (inst->scope, buf); | |
438 | code = ui_file_xstrdup (buf, NULL); | |
439 | do_cleanups (cleanup); | |
440 | return code; | |
441 | } |