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672a6f42 | 1 | /* Data structure definitions for a generic GCC target. |
9b580a0b | 2 | Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
c7ec5472 | 3 | Free Software Foundation, Inc. |
672a6f42 | 4 | |
9dcd6f09 NC |
5 | This program is free software; you can redistribute it and/or modify it |
6 | under the terms of the GNU General Public License as published by the | |
7 | Free Software Foundation; either version 3, or (at your option) any | |
8 | later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; see the file COPYING3. If not see | |
17 | <http://www.gnu.org/licenses/>. | |
18 | ||
19 | In other words, you are welcome to use, share and improve this program. | |
20 | You are forbidden to forbid anyone else to use, share and improve | |
21 | what you give them. Help stamp out software-hoarding! */ | |
22 | ||
672a6f42 NB |
23 | |
24 | /* This file contains a data structure that describes a GCC target. | |
17b53c33 | 25 | At present it is incomplete, but in future it should grow to |
672a6f42 NB |
26 | contain most or all target machine and target O/S specific |
27 | information. | |
28 | ||
29 | This structure has its initializer declared in target-def.h in the | |
30 | form of large macro TARGET_INITIALIZER that expands to many smaller | |
31 | macros. | |
32 | ||
33 | The smaller macros each initialize one component of the structure, | |
34 | and each has a default. Each target should have a file that | |
35 | includes target.h and target-def.h, and overrides any inappropriate | |
36 | defaults by undefining the relevant macro and defining a suitable | |
37 | replacement. That file should then contain the definition of | |
f6897b10 | 38 | "targetm" like so: |
672a6f42 | 39 | |
f6897b10 | 40 | struct gcc_target targetm = TARGET_INITIALIZER; |
672a6f42 NB |
41 | |
42 | Doing things this way allows us to bring together everything that | |
17b53c33 NB |
43 | defines a GCC target. By supplying a default that is appropriate |
44 | to most targets, we can easily add new items without needing to | |
45 | edit dozens of target configuration files. It should also allow us | |
46 | to gradually reduce the amount of conditional compilation that is | |
47 | scattered throughout GCC. */ | |
672a6f42 | 48 | |
59587b18 JQ |
49 | #ifndef GCC_TARGET_H |
50 | #define GCC_TARGET_H | |
51 | ||
7bb1ad93 | 52 | #include "tm.h" |
59587b18 | 53 | #include "insn-modes.h" |
7bb1ad93 | 54 | |
e0d9d0dd NC |
55 | /* Types used by the record_gcc_switches() target function. */ |
56 | typedef enum | |
57 | { | |
58 | SWITCH_TYPE_PASSED, /* A switch passed on the command line. */ | |
59 | SWITCH_TYPE_ENABLED, /* An option that is currently enabled. */ | |
60 | SWITCH_TYPE_DESCRIPTIVE, /* Descriptive text, not a switch or option. */ | |
61 | SWITCH_TYPE_LINE_START, /* Please emit any necessary text at the start of a line. */ | |
62 | SWITCH_TYPE_LINE_END /* Please emit a line terminator. */ | |
63 | } | |
64 | print_switch_type; | |
65 | ||
66 | typedef int (* print_switch_fn_type) (print_switch_type, const char *); | |
67 | ||
68 | /* An example implementation for ELF targets. Defined in varasm.c */ | |
69 | extern int elf_record_gcc_switches (print_switch_type type, const char *); | |
70 | ||
9d30f3c1 | 71 | struct stdarg_info; |
496d7bb0 | 72 | struct spec_info_def; |
9d30f3c1 | 73 | |
8a99f6f9 R |
74 | /* The struct used by the secondary_reload target hook. */ |
75 | typedef struct secondary_reload_info | |
76 | { | |
77 | /* icode is actually an enum insn_code, but we don't want to force every | |
78 | file that includes target.h to include optabs.h . */ | |
79 | int icode; | |
80 | int extra_cost; /* Cost for using (a) scratch register(s) to be taken | |
81 | into account by copy_cost. */ | |
82 | /* The next two members are for the use of the backward | |
83 | compatibility hook. */ | |
84 | struct secondary_reload_info *prev_sri; | |
85 | int t_icode; /* Actually an enum insn_code - see above. */ | |
86 | } secondary_reload_info; | |
87 | ||
b198261f MK |
88 | /* This is defined in sched-int.h . */ |
89 | struct _dep; | |
8a99f6f9 | 90 | |
672a6f42 NB |
91 | struct gcc_target |
92 | { | |
08c148a8 NB |
93 | /* Functions that output assembler for the target. */ |
94 | struct asm_out | |
95 | { | |
17b53c33 NB |
96 | /* Opening and closing parentheses for asm expression grouping. */ |
97 | const char *open_paren, *close_paren; | |
98 | ||
301d03af RS |
99 | /* Assembler instructions for creating various kinds of integer object. */ |
100 | const char *byte_op; | |
101 | struct asm_int_op | |
102 | { | |
103 | const char *hi; | |
104 | const char *si; | |
105 | const char *di; | |
106 | const char *ti; | |
107 | } aligned_op, unaligned_op; | |
108 | ||
109 | /* Try to output the assembler code for an integer object whose | |
110 | value is given by X. SIZE is the size of the object in bytes and | |
111 | ALIGNED_P indicates whether it is aligned. Return true if | |
112 | successful. Only handles cases for which BYTE_OP, ALIGNED_OP | |
113 | and UNALIGNED_OP are NULL. */ | |
46c5ad27 | 114 | bool (* integer) (rtx x, unsigned int size, int aligned_p); |
301d03af | 115 | |
5eb99654 | 116 | /* Output code that will globalize a label. */ |
46c5ad27 | 117 | void (* globalize_label) (FILE *, const char *); |
5eb99654 | 118 | |
da08281c | 119 | /* Output code that will globalize a declaration. */ |
812b587e SE |
120 | void (* globalize_decl_name) (FILE *, tree); |
121 | ||
4746cf84 MA |
122 | /* Output code that will emit a label for unwind info, if this |
123 | target requires such labels. Second argument is the decl the | |
eeab4d81 MS |
124 | unwind info is associated with, third is a boolean: true if |
125 | this is for exception handling, fourth is a boolean: true if | |
9cf737f8 | 126 | this is only a placeholder for an omitted FDE. */ |
eeab4d81 | 127 | void (* unwind_label) (FILE *, tree, int, int); |
4746cf84 | 128 | |
083cad55 EC |
129 | /* Output code that will emit a label to divide up the exception |
130 | table. */ | |
131 | void (* except_table_label) (FILE *); | |
132 | ||
951120ea PB |
133 | /* Emit any directives required to unwind this instruction. */ |
134 | void (* unwind_emit) (FILE *, rtx); | |
135 | ||
4977bab6 | 136 | /* Output an internal label. */ |
46c5ad27 | 137 | void (* internal_label) (FILE *, const char *, unsigned long); |
4977bab6 | 138 | |
617a1b71 PB |
139 | /* Emit a ttype table reference to a typeinfo object. */ |
140 | bool (* ttype) (rtx); | |
141 | ||
93638d7a AM |
142 | /* Emit an assembler directive to set visibility for the symbol |
143 | associated with the tree decl. */ | |
46c5ad27 | 144 | void (* visibility) (tree, int); |
93638d7a | 145 | |
08c148a8 | 146 | /* Output the assembler code for entry to a function. */ |
46c5ad27 | 147 | void (* function_prologue) (FILE *, HOST_WIDE_INT); |
08c148a8 | 148 | |
b4c25db2 | 149 | /* Output the assembler code for end of prologue. */ |
46c5ad27 | 150 | void (* function_end_prologue) (FILE *); |
b4c25db2 NB |
151 | |
152 | /* Output the assembler code for start of epilogue. */ | |
46c5ad27 | 153 | void (* function_begin_epilogue) (FILE *); |
b4c25db2 | 154 | |
08c148a8 | 155 | /* Output the assembler code for function exit. */ |
46c5ad27 | 156 | void (* function_epilogue) (FILE *, HOST_WIDE_INT); |
7c262518 | 157 | |
d6b5193b RS |
158 | /* Initialize target-specific sections. */ |
159 | void (* init_sections) (void); | |
160 | ||
c18a5b6c MM |
161 | /* Tell assembler to change to section NAME with attributes FLAGS. |
162 | If DECL is non-NULL, it is the VAR_DECL or FUNCTION_DECL with | |
163 | which this section is associated. */ | |
164 | void (* named_section) (const char *name, unsigned int flags, tree decl); | |
2cc07db4 | 165 | |
9b580a0b RH |
166 | /* Return a mask describing how relocations should be treated when |
167 | selecting sections. Bit 1 should be set if global relocations | |
168 | should be placed in a read-write section; bit 0 should be set if | |
169 | local relocations should be placed in a read-write section. */ | |
170 | int (*reloc_rw_mask) (void); | |
171 | ||
d6b5193b RS |
172 | /* Return a section for EXP. It may be a DECL or a constant. RELOC |
173 | is nonzero if runtime relocations must be applied; bit 1 will be | |
174 | set if the runtime relocations require non-local name resolution. | |
175 | ALIGN is the required alignment of the data. */ | |
176 | section *(* select_section) (tree, int, unsigned HOST_WIDE_INT); | |
ae46c4e0 | 177 | |
d6b5193b RS |
178 | /* Return a section for X. MODE is X's mode and ALIGN is its |
179 | alignment in bits. */ | |
180 | section *(* select_rtx_section) (enum machine_mode, rtx, | |
181 | unsigned HOST_WIDE_INT); | |
b64a1b53 | 182 | |
ae46c4e0 RH |
183 | /* Select a unique section name for DECL. RELOC is the same as |
184 | for SELECT_SECTION. */ | |
46c5ad27 | 185 | void (* unique_section) (tree, int); |
ae46c4e0 | 186 | |
d6b5193b RS |
187 | /* Return the readonly data section associated with function DECL. */ |
188 | section *(* function_rodata_section) (tree); | |
ab5c8549 | 189 | |
2cc07db4 | 190 | /* Output a constructor for a symbol with a given priority. */ |
46c5ad27 | 191 | void (* constructor) (rtx, int); |
2cc07db4 RH |
192 | |
193 | /* Output a destructor for a symbol with a given priority. */ | |
46c5ad27 | 194 | void (* destructor) (rtx, int); |
483ab821 | 195 | |
3961e8fe RH |
196 | /* Output the assembler code for a thunk function. THUNK_DECL is the |
197 | declaration for the thunk function itself, FUNCTION is the decl for | |
198 | the target function. DELTA is an immediate constant offset to be | |
476c5eb6 | 199 | added to THIS. If VCALL_OFFSET is nonzero, the word at |
3961e8fe | 200 | *(*this + vcall_offset) should be added to THIS. */ |
46c5ad27 AJ |
201 | void (* output_mi_thunk) (FILE *file, tree thunk_decl, |
202 | HOST_WIDE_INT delta, HOST_WIDE_INT vcall_offset, | |
203 | tree function_decl); | |
3961e8fe RH |
204 | |
205 | /* Determine whether output_mi_thunk would succeed. */ | |
206 | /* ??? Ideally, this hook would not exist, and success or failure | |
207 | would be returned from output_mi_thunk directly. But there's | |
208 | too much undo-able setup involved in invoking output_mi_thunk. | |
209 | Could be fixed by making output_mi_thunk emit rtl instead of | |
210 | text to the output file. */ | |
46c5ad27 AJ |
211 | bool (* can_output_mi_thunk) (tree thunk_decl, HOST_WIDE_INT delta, |
212 | HOST_WIDE_INT vcall_offset, | |
213 | tree function_decl); | |
a5fe455b | 214 | |
1bc7c5b6 ZW |
215 | /* Output any boilerplate text needed at the beginning of a |
216 | translation unit. */ | |
46c5ad27 | 217 | void (*file_start) (void); |
1bc7c5b6 ZW |
218 | |
219 | /* Output any boilerplate text needed at the end of a | |
220 | translation unit. */ | |
46c5ad27 | 221 | void (*file_end) (void); |
6773a41c RO |
222 | |
223 | /* Output an assembler pseudo-op to declare a library function name | |
224 | external. */ | |
225 | void (*external_libcall) (rtx); | |
8e3e233b | 226 | |
e0d9d0dd | 227 | /* Output an assembler directive to mark decl live. This instructs |
8e3e233b DP |
228 | linker to not dead code strip this symbol. */ |
229 | void (*mark_decl_preserved) (const char *); | |
230 | ||
e0d9d0dd NC |
231 | /* Output a record of the command line switches that have been passed. */ |
232 | print_switch_fn_type record_gcc_switches; | |
233 | /* The name of the section that the example ELF implementation of | |
234 | record_gcc_switches will use to store the information. Target | |
235 | specific versions of record_gcc_switches may or may not use | |
236 | this information. */ | |
237 | const char * record_gcc_switches_section; | |
238 | ||
aacd3885 RS |
239 | /* Output the definition of a section anchor. */ |
240 | void (*output_anchor) (rtx); | |
241 | ||
fdbe66f2 EB |
242 | /* Output a DTP-relative reference to a TLS symbol. */ |
243 | void (*output_dwarf_dtprel) (FILE *file, int size, rtx x); | |
244 | ||
08c148a8 NB |
245 | } asm_out; |
246 | ||
c237e94a ZW |
247 | /* Functions relating to instruction scheduling. */ |
248 | struct sched | |
249 | { | |
250 | /* Given the current cost, COST, of an insn, INSN, calculate and | |
251 | return a new cost based on its relationship to DEP_INSN through | |
252 | the dependence LINK. The default is to make no adjustment. */ | |
b198261f | 253 | int (* adjust_cost) (rtx insn, rtx link, rtx dep_insn, int cost); |
c237e94a ZW |
254 | |
255 | /* Adjust the priority of an insn as you see fit. Returns the new | |
256 | priority. */ | |
46c5ad27 | 257 | int (* adjust_priority) (rtx, int); |
c237e94a ZW |
258 | |
259 | /* Function which returns the maximum number of insns that can be | |
260 | scheduled in the same machine cycle. This must be constant | |
261 | over an entire compilation. The default is 1. */ | |
46c5ad27 | 262 | int (* issue_rate) (void); |
c237e94a ZW |
263 | |
264 | /* Calculate how much this insn affects how many more insns we | |
265 | can emit this cycle. Default is they all cost the same. */ | |
46c5ad27 | 266 | int (* variable_issue) (FILE *, int, rtx, int); |
41077ce4 | 267 | |
c237e94a | 268 | /* Initialize machine-dependent scheduling code. */ |
46c5ad27 | 269 | void (* md_init) (FILE *, int, int); |
c237e94a ZW |
270 | |
271 | /* Finalize machine-dependent scheduling code. */ | |
46c5ad27 | 272 | void (* md_finish) (FILE *, int); |
c237e94a | 273 | |
58565a33 SKG |
274 | /* Initialize machine-dependent function while scheduling code. */ |
275 | void (* md_init_global) (FILE *, int, int); | |
276 | ||
277 | /* Finalize machine-dependent function wide scheduling code. */ | |
278 | void (* md_finish_global) (FILE *, int); | |
279 | ||
c237e94a ZW |
280 | /* Reorder insns in a machine-dependent fashion, in two different |
281 | places. Default does nothing. */ | |
46c5ad27 AJ |
282 | int (* reorder) (FILE *, int, rtx *, int *, int); |
283 | int (* reorder2) (FILE *, int, rtx *, int *, int); | |
c237e94a | 284 | |
30028c85 VM |
285 | /* The following member value is a pointer to a function called |
286 | after evaluation forward dependencies of insns in chain given | |
287 | by two parameter values (head and tail correspondingly). */ | |
46c5ad27 | 288 | void (* dependencies_evaluation_hook) (rtx, rtx); |
30028c85 | 289 | |
fae15c93 VM |
290 | /* The values of the following four members are pointers to |
291 | functions used to simplify the automaton descriptions. | |
292 | dfa_pre_cycle_insn and dfa_post_cycle_insn give functions | |
293 | returning insns which are used to change the pipeline hazard | |
294 | recognizer state when the new simulated processor cycle | |
295 | correspondingly starts and finishes. The function defined by | |
296 | init_dfa_pre_cycle_insn and init_dfa_post_cycle_insn are used | |
297 | to initialize the corresponding insns. The default values of | |
d91edf86 | 298 | the members result in not changing the automaton state when |
fae15c93 VM |
299 | the new simulated processor cycle correspondingly starts and |
300 | finishes. */ | |
46c5ad27 AJ |
301 | void (* init_dfa_pre_cycle_insn) (void); |
302 | rtx (* dfa_pre_cycle_insn) (void); | |
303 | void (* init_dfa_post_cycle_insn) (void); | |
304 | rtx (* dfa_post_cycle_insn) (void); | |
fa0aee89 | 305 | |
1c3d0d93 MK |
306 | /* The values of the following two members are pointers to |
307 | functions used to simplify the automaton descriptions. | |
308 | dfa_pre_advance_cycle and dfa_post_advance_cycle are getting called | |
309 | immediatelly before and after cycle is advanced. */ | |
310 | void (* dfa_pre_advance_cycle) (void); | |
311 | void (* dfa_post_advance_cycle) (void); | |
312 | ||
fae15c93 VM |
313 | /* The following member value is a pointer to a function returning value |
314 | which defines how many insns in queue `ready' will we try for | |
5ad6fca5 | 315 | multi-pass scheduling. If the member value is nonzero and the |
fae15c93 VM |
316 | function returns positive value, the DFA based scheduler will make |
317 | multi-pass scheduling for the first cycle. In other words, we will | |
318 | try to choose ready insn which permits to start maximum number of | |
319 | insns on the same cycle. */ | |
46c5ad27 | 320 | int (* first_cycle_multipass_dfa_lookahead) (void); |
fa0aee89 | 321 | |
30028c85 VM |
322 | /* The following member value is pointer to a function controlling |
323 | what insns from the ready insn queue will be considered for the | |
324 | multipass insn scheduling. If the hook returns zero for insn | |
325 | passed as the parameter, the insn will be not chosen to be | |
326 | issued. */ | |
46c5ad27 | 327 | int (* first_cycle_multipass_dfa_lookahead_guard) (rtx); |
fa0aee89 | 328 | |
30028c85 VM |
329 | /* The following member value is pointer to a function called by |
330 | the insn scheduler before issuing insn passed as the third | |
331 | parameter on given cycle. If the hook returns nonzero, the | |
332 | insn is not issued on given processors cycle. Instead of that, | |
333 | the processor cycle is advanced. If the value passed through | |
334 | the last parameter is zero, the insn ready queue is not sorted | |
335 | on the new cycle start as usually. The first parameter passes | |
336 | file for debugging output. The second one passes the scheduler | |
337 | verbose level of the debugging output. The forth and the fifth | |
338 | parameter values are correspondingly processor cycle on which | |
339 | the previous insn has been issued and the current processor | |
340 | cycle. */ | |
46c5ad27 | 341 | int (* dfa_new_cycle) (FILE *, int, rtx, int, int, int *); |
fa0aee89 | 342 | |
b198261f MK |
343 | /* The following member value is a pointer to a function called by the |
344 | insn scheduler. It should return true if there exists a dependence | |
345 | which is considered costly by the target, between the insn | |
346 | DEP_PRO (&_DEP), and the insn DEP_CON (&_DEP). The first parameter is | |
347 | the dep that represents the dependence between the two insns. The | |
348 | second argument is the cost of the dependence as estimated by | |
f676971a | 349 | the scheduler. The last argument is the distance in cycles |
569fa502 | 350 | between the already scheduled insn (first parameter) and the |
80fcc7bc | 351 | the second insn (second parameter). */ |
b198261f | 352 | bool (* is_costly_dependence) (struct _dep *_dep, int, int); |
496d7bb0 MK |
353 | |
354 | /* The following member value is a pointer to a function called | |
355 | by the insn scheduler. This hook is called to notify the backend | |
356 | that new instructions were emitted. */ | |
357 | void (* h_i_d_extended) (void); | |
358 | ||
359 | /* The following member value is a pointer to a function called | |
360 | by the insn scheduler. | |
361 | The first parameter is an instruction, the second parameter is the type | |
362 | of the requested speculation, and the third parameter is a pointer to the | |
363 | speculative pattern of the corresponding type (set if return value == 1). | |
364 | It should return | |
365 | -1, if there is no pattern, that will satisfy the requested speculation | |
366 | type, | |
367 | 0, if current pattern satisfies the requested speculation type, | |
368 | 1, if pattern of the instruction should be changed to the newly | |
369 | generated one. */ | |
c7ec5472 | 370 | int (* speculate_insn) (rtx, int, rtx *); |
496d7bb0 MK |
371 | |
372 | /* The following member value is a pointer to a function called | |
373 | by the insn scheduler. It should return true if the check instruction | |
374 | corresponding to the instruction passed as the parameter needs a | |
375 | recovery block. */ | |
376 | bool (* needs_block_p) (rtx); | |
377 | ||
378 | /* The following member value is a pointer to a function called | |
379 | by the insn scheduler. It should return a pattern for the check | |
380 | instruction. | |
381 | The first parameter is a speculative instruction, the second parameter | |
382 | is the label of the corresponding recovery block (or null, if it is a | |
383 | simple check). If the mutation of the check is requested (e.g. from | |
384 | ld.c to chk.a), the third parameter is true - in this case the first | |
385 | parameter is the previous check. */ | |
386 | rtx (* gen_check) (rtx, rtx, bool); | |
387 | ||
388 | /* The following member value is a pointer to a function controlling | |
389 | what insns from the ready insn queue will be considered for the | |
390 | multipass insn scheduling. If the hook returns zero for the insn | |
391 | passed as the parameter, the insn will not be chosen to be | |
392 | issued. This hook is used to discard speculative instructions, | |
393 | that stand at the first position of the ready list. */ | |
394 | bool (* first_cycle_multipass_dfa_lookahead_guard_spec) (rtx); | |
395 | ||
396 | /* The following member value is a pointer to a function that provides | |
397 | information about the speculation capabilities of the target. | |
398 | The parameter is a pointer to spec_info variable. */ | |
399 | void (* set_sched_flags) (struct spec_info_def *); | |
c237e94a ZW |
400 | } sched; |
401 | ||
7ccf35ed DN |
402 | /* Functions relating to vectorization. */ |
403 | struct vectorize | |
404 | { | |
d16b59fa | 405 | /* The following member value is a pointer to a function called |
7ccf35ed DN |
406 | by the vectorizer, and return the decl of the target builtin |
407 | function. */ | |
408 | tree (* builtin_mask_for_load) (void); | |
89d67cca | 409 | |
2505a3f2 RG |
410 | /* Returns a code for builtin that realizes vectorized version of |
411 | function, or NULL_TREE if not available. */ | |
b95becfc | 412 | tree (* builtin_vectorized_function) (unsigned, tree, tree); |
2505a3f2 | 413 | |
f57d17f1 TM |
414 | /* Returns a code for builtin that realizes vectorized version of |
415 | conversion, or NULL_TREE if not available. */ | |
416 | tree (* builtin_conversion) (unsigned, tree); | |
417 | ||
89d67cca DN |
418 | /* Target builtin that implements vector widening multiplication. |
419 | builtin_mul_widen_eve computes the element-by-element products | |
420 | for the even elements, and builtin_mul_widen_odd computes the | |
421 | element-by-element products for the odd elements. */ | |
422 | tree (* builtin_mul_widen_even) (tree); | |
423 | tree (* builtin_mul_widen_odd) (tree); | |
e95b59d2 DN |
424 | |
425 | /* Returns the cost to be added to the overheads involved with | |
426 | executing the vectorized version of a loop. */ | |
427 | int (*builtin_vectorization_cost) (bool); | |
5b900a4c DN |
428 | |
429 | /* Return true if vector alignment is reachable (by peeling N | |
cea618ac | 430 | iterations) for the given type. */ |
5b900a4c | 431 | bool (* vector_alignment_reachable) (tree, bool); |
7ccf35ed DN |
432 | } vectorize; |
433 | ||
75685792 RS |
434 | /* The initial value of target_flags. */ |
435 | int default_target_flags; | |
436 | ||
437 | /* Handle target switch CODE (an OPT_* value). ARG is the argument | |
438 | passed to the switch; it is NULL if no argument was. VALUE is the | |
439 | value of ARG if CODE specifies a UInteger option, otherwise it is | |
440 | 1 if the positive form of the switch was used and 0 if the negative | |
441 | form was. Return true if the switch was valid. */ | |
442 | bool (* handle_option) (size_t code, const char *arg, int value); | |
443 | ||
67e6ba46 NC |
444 | /* Display extra, target specific information in response to a |
445 | --target-help switch. */ | |
446 | void (* target_help) (void); | |
447 | ||
8c27b7d4 | 448 | /* Return machine mode for filter value. */ |
93f90be6 FJ |
449 | enum machine_mode (* eh_return_filter_mode) (void); |
450 | ||
c7ff6e7a AK |
451 | /* Return machine mode for libgcc expanded cmp instructions. */ |
452 | enum machine_mode (* libgcc_cmp_return_mode) (void); | |
453 | ||
454 | /* Return machine mode for libgcc expanded shift instructions. */ | |
455 | enum machine_mode (* libgcc_shift_count_mode) (void); | |
456 | ||
672a6f42 | 457 | /* Given two decls, merge their attributes and return the result. */ |
46c5ad27 | 458 | tree (* merge_decl_attributes) (tree, tree); |
672a6f42 NB |
459 | |
460 | /* Given two types, merge their attributes and return the result. */ | |
46c5ad27 | 461 | tree (* merge_type_attributes) (tree, tree); |
672a6f42 | 462 | |
349ae713 NB |
463 | /* Table of machine attributes and functions to handle them. |
464 | Ignored if NULL. */ | |
91d231cb | 465 | const struct attribute_spec *attribute_table; |
8d8e52be JM |
466 | |
467 | /* Return zero if the attributes on TYPE1 and TYPE2 are incompatible, | |
468 | one if they are compatible and two if they are nearly compatible | |
469 | (which causes a warning to be generated). */ | |
46c5ad27 | 470 | int (* comp_type_attributes) (tree type1, tree type2); |
8d8e52be JM |
471 | |
472 | /* Assign default attributes to the newly defined TYPE. */ | |
46c5ad27 | 473 | void (* set_default_type_attributes) (tree type); |
12a68f1f JM |
474 | |
475 | /* Insert attributes on the newly created DECL. */ | |
46c5ad27 | 476 | void (* insert_attributes) (tree decl, tree *attributes); |
f6155fda | 477 | |
91d231cb JM |
478 | /* Return true if FNDECL (which has at least one machine attribute) |
479 | can be inlined despite its machine attributes, false otherwise. */ | |
46c5ad27 | 480 | bool (* function_attribute_inlinable_p) (tree fndecl); |
91d231cb | 481 | |
f913c102 AO |
482 | /* Return true if bitfields in RECORD_TYPE should follow the |
483 | Microsoft Visual C++ bitfield layout rules. */ | |
46c5ad27 | 484 | bool (* ms_bitfield_layout_p) (tree record_type); |
f913c102 | 485 | |
9a8ce21f JG |
486 | /* True if the target supports decimal floating point. */ |
487 | bool (* decimal_float_supported_p) (void); | |
488 | ||
ab22c1fa CF |
489 | /* True if the target supports fixed-point. */ |
490 | bool (* fixed_point_supported_p) (void); | |
491 | ||
13c1cd82 PB |
492 | /* Return true if anonymous bitfields affect structure alignment. */ |
493 | bool (* align_anon_bitfield) (void); | |
494 | ||
c2a64439 PB |
495 | /* Return true if volatile bitfields should use the narrowest type possible. |
496 | Return false if they should use the container type. */ | |
497 | bool (* narrow_volatile_bitfield) (void); | |
498 | ||
f6155fda | 499 | /* Set up target-specific built-in functions. */ |
46c5ad27 | 500 | void (* init_builtins) (void); |
f6155fda SS |
501 | |
502 | /* Expand a target-specific builtin. */ | |
46c5ad27 AJ |
503 | rtx (* expand_builtin) (tree exp, rtx target, rtx subtarget, |
504 | enum machine_mode mode, int ignore); | |
7c262518 | 505 | |
58646b77 PB |
506 | /* Select a replacement for a target-specific builtin. This is done |
507 | *before* regular type checking, and so allows the target to implement | |
508 | a crude form of function overloading. The result is a complete | |
509 | expression that implements the operation. */ | |
510 | tree (*resolve_overloaded_builtin) (tree decl, tree params); | |
511 | ||
c2dda19b | 512 | /* Fold a target-specific builtin. */ |
a05a80fc | 513 | tree (* fold_builtin) (tree fndecl, tree arglist, bool ignore); |
083cad55 | 514 | |
6b889d89 UB |
515 | /* Returns a code for a target-specific builtin that implements |
516 | reciprocal of the function, or NULL_TREE if not available. */ | |
ac10986f | 517 | tree (* builtin_reciprocal) (unsigned, bool, bool); |
6b889d89 | 518 | |
608063c3 JB |
519 | /* For a vendor-specific TYPE, return a pointer to a statically-allocated |
520 | string containing the C++ mangling for TYPE. In all other cases, return | |
521 | NULL. */ | |
522 | const char * (* mangle_type) (tree type); | |
f18eca82 | 523 | |
c15c90bb ZW |
524 | /* Make any adjustments to libfunc names needed for this target. */ |
525 | void (* init_libfuncs) (void); | |
526 | ||
7c262518 RH |
527 | /* Given a decl, a section name, and whether the decl initializer |
528 | has relocs, choose attributes for the section. */ | |
529 | /* ??? Should be merged with SELECT_SECTION and UNIQUE_SECTION. */ | |
46c5ad27 | 530 | unsigned int (* section_type_flags) (tree, const char *, int); |
7c262518 | 531 | |
e4ec2cac AO |
532 | /* True if new jumps cannot be created, to replace existing ones or |
533 | not, at the current point in the compilation. */ | |
46c5ad27 | 534 | bool (* cannot_modify_jumps_p) (void); |
ae46c4e0 | 535 | |
a3424f5c RH |
536 | /* Return a register class for which branch target register |
537 | optimizations should be applied. */ | |
46c5ad27 | 538 | int (* branch_target_register_class) (void); |
a3424f5c RH |
539 | |
540 | /* Return true if branch target register optimizations should include | |
541 | callee-saved registers that are not already live during the current | |
542 | function. AFTER_PE_GEN is true if prologues and epilogues have | |
543 | already been generated. */ | |
46c5ad27 | 544 | bool (* branch_target_register_callee_saved) (bool after_pe_gen); |
fe3ad572 | 545 | |
3a04ff64 | 546 | /* True if the constant X cannot be placed in the constant pool. */ |
46c5ad27 | 547 | bool (* cannot_force_const_mem) (rtx); |
3a04ff64 | 548 | |
0b077eac | 549 | /* True if the insn X cannot be duplicated. */ |
46c5ad27 | 550 | bool (* cannot_copy_insn_p) (rtx); |
0b077eac | 551 | |
8ddf681a R |
552 | /* True if X is considered to be commutative. */ |
553 | bool (* commutative_p) (rtx, int); | |
554 | ||
7daebb7a | 555 | /* Given an address RTX, undo the effects of LEGITIMIZE_ADDRESS. */ |
46c5ad27 | 556 | rtx (* delegitimize_address) (rtx); |
7daebb7a | 557 | |
aacd3885 RS |
558 | /* True if the given constant can be put into an object_block. */ |
559 | bool (* use_blocks_for_constant_p) (enum machine_mode, rtx); | |
560 | ||
561 | /* The minimum and maximum byte offsets for anchored addresses. */ | |
562 | HOST_WIDE_INT min_anchor_offset; | |
563 | HOST_WIDE_INT max_anchor_offset; | |
564 | ||
565 | /* True if section anchors can be used to access the given symbol. */ | |
566 | bool (* use_anchors_for_symbol_p) (rtx); | |
567 | ||
4977bab6 ZW |
568 | /* True if it is OK to do sibling call optimization for the specified |
569 | call expression EXP. DECL will be the called function, or NULL if | |
570 | this is an indirect call. */ | |
46c5ad27 AJ |
571 | bool (*function_ok_for_sibcall) (tree decl, tree exp); |
572 | ||
ae46c4e0 | 573 | /* True if EXP should be placed in a "small data" section. */ |
46c5ad27 | 574 | bool (* in_small_data_p) (tree); |
fb49053f | 575 | |
47754fd5 RH |
576 | /* True if EXP names an object for which name resolution must resolve |
577 | to the current module. */ | |
46c5ad27 | 578 | bool (* binds_local_p) (tree); |
47754fd5 | 579 | |
5234b8f5 DS |
580 | /* Modify and return the identifier of a DECL's external name, |
581 | originally identified by ID, as required by the target, | |
582 | (eg, append @nn to windows32 stdcall function names). | |
583 | The default is to return ID without modification. */ | |
584 | tree (* mangle_decl_assembler_name) (tree decl, tree id); | |
585 | ||
fb49053f RH |
586 | /* Do something target-specific to record properties of the DECL into |
587 | the associated SYMBOL_REF. */ | |
46c5ad27 | 588 | void (* encode_section_info) (tree, rtx, int); |
772c5265 RH |
589 | |
590 | /* Undo the effects of encode_section_info on the symbol string. */ | |
46c5ad27 | 591 | const char * (* strip_name_encoding) (const char *); |
47754fd5 | 592 | |
273a2526 RS |
593 | /* If shift optabs for MODE are known to always truncate the shift count, |
594 | return the mask that they apply. Return 0 otherwise. */ | |
595 | unsigned HOST_WIDE_INT (* shift_truncation_mask) (enum machine_mode mode); | |
596 | ||
bc23502b PB |
597 | /* Return the number of divisions in the given MODE that should be present, |
598 | so that it is profitable to turn the division into a multiplication by | |
599 | the reciprocal. */ | |
600 | unsigned int (* min_divisions_for_recip_mul) (enum machine_mode mode); | |
601 | ||
b12cbf2c AN |
602 | /* If the representation of integral MODE is such that values are |
603 | always sign-extended to a wider mode MODE_REP then return | |
604 | SIGN_EXTEND. Return UNKNOWN otherwise. */ | |
605 | /* Note that the return type ought to be RTX_CODE, but that's not | |
606 | necessarily defined at this point. */ | |
607 | int (* mode_rep_extended) (enum machine_mode mode, | |
608 | enum machine_mode mode_rep); | |
609 | ||
3c50106f | 610 | /* True if MODE is valid for a pointer in __attribute__((mode("MODE"))). */ |
46c5ad27 | 611 | bool (* valid_pointer_mode) (enum machine_mode mode); |
3c50106f | 612 | |
6dd53648 RH |
613 | /* True if MODE is valid for the target. By "valid", we mean able to |
614 | be manipulated in non-trivial ways. In particular, this means all | |
615 | the arithmetic is supported. */ | |
616 | bool (* scalar_mode_supported_p) (enum machine_mode mode); | |
617 | ||
618 | /* Similarly for vector modes. "Supported" here is less strict. At | |
619 | least some operations are supported; need to check optabs or builtins | |
620 | for further details. */ | |
f676971a EC |
621 | bool (* vector_mode_supported_p) (enum machine_mode mode); |
622 | ||
c8e4f0e9 | 623 | /* True if a vector is opaque. */ |
46c5ad27 | 624 | bool (* vector_opaque_p) (tree); |
62e1dfcf | 625 | |
3c50106f RH |
626 | /* Compute a (partial) cost for rtx X. Return true if the complete |
627 | cost has been computed, and false if subexpressions should be | |
628 | scanned. In either case, *TOTAL contains the cost result. */ | |
629 | /* Note that CODE and OUTER_CODE ought to be RTX_CODE, but that's | |
630 | not necessarily defined at this point. */ | |
46c5ad27 | 631 | bool (* rtx_costs) (rtx x, int code, int outer_code, int *total); |
3c50106f | 632 | |
dcefdf67 RH |
633 | /* Compute the cost of X, used as an address. Never called with |
634 | invalid addresses. */ | |
46c5ad27 | 635 | int (* address_cost) (rtx x); |
dcefdf67 | 636 | |
b48f503c KK |
637 | /* Return where to allocate pseudo for a given hard register initial |
638 | value. */ | |
639 | rtx (* allocate_initial_value) (rtx x); | |
640 | ||
96714395 AH |
641 | /* Given a register, this hook should return a parallel of registers |
642 | to represent where to find the register pieces. Define this hook | |
643 | if the register and its mode are represented in Dwarf in | |
644 | non-contiguous locations, or if the register should be | |
645 | represented in more than one register in Dwarf. Otherwise, this | |
646 | hook should return NULL_RTX. */ | |
46c5ad27 | 647 | rtx (* dwarf_register_span) (rtx); |
96714395 | 648 | |
37ea0b7e JM |
649 | /* If expand_builtin_init_dwarf_reg_sizes needs to fill in table |
650 | entries not corresponding directly to registers below | |
651 | FIRST_PSEUDO_REGISTER, this hook should generate the necessary | |
652 | code, given the address of the table. */ | |
653 | void (* init_dwarf_reg_sizes_extra) (tree); | |
654 | ||
e129d93a ILT |
655 | /* Fetch the fixed register(s) which hold condition codes, for |
656 | targets where it makes sense to look for duplicate assignments to | |
657 | the condition codes. This should return true if there is such a | |
658 | register, false otherwise. The arguments should be set to the | |
659 | fixed register numbers. Up to two condition code registers are | |
660 | supported. If there is only one for this target, the int pointed | |
661 | at by the second argument should be set to -1. */ | |
662 | bool (* fixed_condition_code_regs) (unsigned int *, unsigned int *); | |
663 | ||
664 | /* If two condition code modes are compatible, return a condition | |
665 | code mode which is compatible with both, such that a comparison | |
666 | done in the returned mode will work for both of the original | |
667 | modes. If the condition code modes are not compatible, return | |
668 | VOIDmode. */ | |
669 | enum machine_mode (* cc_modes_compatible) (enum machine_mode, | |
670 | enum machine_mode); | |
671 | ||
18dbd950 RS |
672 | /* Do machine-dependent code transformations. Called just before |
673 | delayed-branch scheduling. */ | |
46c5ad27 | 674 | void (* machine_dependent_reorg) (void); |
18dbd950 | 675 | |
c35d187f RH |
676 | /* Create the __builtin_va_list type. */ |
677 | tree (* build_builtin_va_list) (void); | |
678 | ||
cdc3ddb8 RH |
679 | /* Gimplifies a VA_ARG_EXPR. */ |
680 | tree (* gimplify_va_arg_expr) (tree valist, tree type, tree *pre_p, | |
681 | tree *post_p); | |
682 | ||
7bb1ad93 GK |
683 | /* Validity-checking routines for PCH files, target-specific. |
684 | get_pch_validity returns a pointer to the data to be stored, | |
685 | and stores the size in its argument. pch_valid_p gets the same | |
686 | information back and returns NULL if the PCH is valid, | |
687 | or an error message if not. | |
688 | */ | |
689 | void * (* get_pch_validity) (size_t *); | |
690 | const char * (* pch_valid_p) (const void *, size_t); | |
691 | ||
8d932be3 RS |
692 | /* If nonnull, this function checks whether a PCH file with the |
693 | given set of target flags can be used. It returns NULL if so, | |
694 | otherwise it returns an error message. */ | |
695 | const char *(*check_pch_target_flags) (int); | |
696 | ||
a841ab8b | 697 | /* True if the compiler should give an enum type only as many |
221ee7c9 KH |
698 | bytes as it takes to represent the range of possible values of |
699 | that type. */ | |
700 | bool (* default_short_enums) (void); | |
701 | ||
d6da68b9 | 702 | /* This target hook returns an rtx that is used to store the address |
a841ab8b | 703 | of the current frame into the built-in setjmp buffer. */ |
d6da68b9 KH |
704 | rtx (* builtin_setjmp_frame_value) (void); |
705 | ||
67dfe110 | 706 | /* This target hook should add STRING_CST trees for any hard regs |
61158923 HPN |
707 | the port wishes to automatically clobber for an asm. */ |
708 | tree (* md_asm_clobbers) (tree, tree, tree); | |
67dfe110 | 709 | |
a1c496cb EC |
710 | /* This target hook allows the backend to specify a calling convention |
711 | in the debug information. This function actually returns an | |
712 | enum dwarf_calling_convention, but because of forward declarations | |
713 | and not wanting to include dwarf2.h everywhere target.h is included | |
714 | the function is being declared as an int. */ | |
715 | int (* dwarf_calling_convention) (tree); | |
716 | ||
e54c7471 EB |
717 | /* This target hook allows the backend to emit frame-related insns that |
718 | contain UNSPECs or UNSPEC_VOLATILEs. The call frame debugging info | |
719 | engine will invoke it on insns of the form | |
720 | (set (reg) (unspec [...] UNSPEC_INDEX)) | |
721 | and | |
722 | (set (reg) (unspec_volatile [...] UNSPECV_INDEX)) | |
723 | to let the backend emit the call frame instructions. */ | |
724 | void (* dwarf_handle_frame_unspec) (const char *, rtx, int); | |
725 | ||
9d30f3c1 JJ |
726 | /* Perform architecture specific checking of statements gimplified |
727 | from VA_ARG_EXPR. LHS is left hand side of MODIFY_EXPR, RHS | |
728 | is right hand side. Returns true if the statements doesn't need | |
729 | to be checked for va_list references. */ | |
7d69de61 RH |
730 | bool (* stdarg_optimize_hook) (struct stdarg_info *ai, tree lhs, tree rhs); |
731 | ||
732 | /* This target hook allows the operating system to override the DECL | |
733 | that represents the external variable that contains the stack | |
734 | protection guard variable. The type of this DECL is ptr_type_node. */ | |
735 | tree (* stack_protect_guard) (void); | |
736 | ||
737 | /* This target hook allows the operating system to override the CALL_EXPR | |
738 | that is invoked when a check vs the guard variable fails. */ | |
739 | tree (* stack_protect_fail) (void); | |
9d30f3c1 | 740 | |
e7e64a25 AS |
741 | /* Returns NULL if target supports the insn within a doloop block, |
742 | otherwise it returns an error message. */ | |
743 | const char * (*invalid_within_doloop) (rtx); | |
43d9ad1d DS |
744 | |
745 | /* DECL is a variable or function with __attribute__((dllimport)) | |
746 | specified. Use this hook if the target needs to add extra validation | |
747 | checks to handle_dll_attribute (). */ | |
748 | bool (* valid_dllimport_attribute_p) (tree decl); | |
083cad55 | 749 | |
42ba5130 RH |
750 | /* Functions relating to calls - argument passing, returns, etc. */ |
751 | struct calls { | |
586de218 KG |
752 | bool (*promote_function_args) (const_tree fntype); |
753 | bool (*promote_function_return) (const_tree fntype); | |
754 | bool (*promote_prototypes) (const_tree fntype); | |
42ba5130 | 755 | rtx (*struct_value_rtx) (tree fndecl, int incoming); |
586de218 KG |
756 | bool (*return_in_memory) (const_tree type, const_tree fndecl); |
757 | bool (*return_in_msb) (const_tree type); | |
8cd5a4e0 RH |
758 | |
759 | /* Return true if a parameter must be passed by reference. TYPE may | |
760 | be null if this is a libcall. CA may be null if this query is | |
761 | from __builtin_va_arg. */ | |
762 | bool (*pass_by_reference) (CUMULATIVE_ARGS *ca, enum machine_mode mode, | |
586de218 | 763 | const_tree type, bool named_arg); |
8cd5a4e0 | 764 | |
42ba5130 RH |
765 | rtx (*expand_builtin_saveregs) (void); |
766 | /* Returns pretend_argument_size. */ | |
767 | void (*setup_incoming_varargs) (CUMULATIVE_ARGS *ca, enum machine_mode mode, | |
768 | tree type, int *pretend_arg_size, | |
769 | int second_time); | |
770 | bool (*strict_argument_naming) (CUMULATIVE_ARGS *ca); | |
771 | /* Returns true if we should use | |
772 | targetm.calls.setup_incoming_varargs() and/or | |
773 | targetm.calls.strict_argument_naming(). */ | |
774 | bool (*pretend_outgoing_varargs_named) (CUMULATIVE_ARGS *ca); | |
775 | ||
776 | /* Given a complex type T, return true if a parameter of type T | |
777 | should be passed as two scalars. */ | |
778 | bool (* split_complex_arg) (tree type); | |
fe984136 RH |
779 | |
780 | /* Return true if type T, mode MODE, may not be passed in registers, | |
781 | but must be passed on the stack. */ | |
782 | /* ??? This predicate should be applied strictly after pass-by-reference. | |
783 | Need audit to verify that this is the case. */ | |
586de218 | 784 | bool (* must_pass_in_stack) (enum machine_mode mode, const_tree t); |
6cdd5672 RH |
785 | |
786 | /* Return true if type TYPE, mode MODE, which is passed by reference, | |
787 | should have the object copy generated by the callee rather than | |
788 | the caller. It is never called for TYPE requiring constructors. */ | |
789 | bool (* callee_copies) (CUMULATIVE_ARGS *ca, enum machine_mode mode, | |
586de218 | 790 | const_tree type, bool named); |
78a52f11 RH |
791 | |
792 | /* Return zero for arguments passed entirely on the stack or entirely | |
793 | in registers. If passed in both, return the number of bytes passed | |
794 | in registers; the balance is therefore passed on the stack. */ | |
795 | int (* arg_partial_bytes) (CUMULATIVE_ARGS *ca, enum machine_mode mode, | |
796 | tree type, bool named); | |
4d3e6fae FJ |
797 | |
798 | /* Return the diagnostic message string if function without a prototype | |
799 | is not allowed for this 'val' argument; NULL otherwise. */ | |
083cad55 | 800 | const char *(*invalid_arg_for_unprototyped_fn) (tree typelist, |
4d3e6fae | 801 | tree funcdecl, tree val); |
1d636cc6 RG |
802 | |
803 | /* Return an rtx for the return value location of the function | |
804 | specified by FN_DECL_OR_TYPE with a return type of RET_TYPE. */ | |
586de218 | 805 | rtx (*function_value) (const_tree ret_type, const_tree fn_decl_or_type, |
1d636cc6 | 806 | bool outgoing); |
150cdc9e RH |
807 | |
808 | /* Return an rtx for the argument pointer incoming to the | |
809 | current function. */ | |
810 | rtx (*internal_arg_pointer) (void); | |
42ba5130 RH |
811 | } calls; |
812 | ||
4de67c26 JM |
813 | /* Return the diagnostic message string if conversion from FROMTYPE |
814 | to TOTYPE is not allowed, NULL otherwise. */ | |
815 | const char *(*invalid_conversion) (tree fromtype, tree totype); | |
816 | ||
817 | /* Return the diagnostic message string if the unary operation OP is | |
818 | not permitted on TYPE, NULL otherwise. */ | |
819 | const char *(*invalid_unary_op) (int op, tree type); | |
820 | ||
821 | /* Return the diagnostic message string if the binary operation OP | |
822 | is not permitted on TYPE1 and TYPE2, NULL otherwise. */ | |
823 | const char *(*invalid_binary_op) (int op, tree type1, tree type2); | |
824 | ||
8a99f6f9 R |
825 | /* Return the class for a secondary reload, and fill in extra information. */ |
826 | enum reg_class (*secondary_reload) (bool, rtx, enum reg_class, | |
827 | enum machine_mode, | |
828 | struct secondary_reload_info *); | |
829 | ||
c77cd3d1 UB |
830 | /* Functions specific to the C family of frontends. */ |
831 | struct c { | |
832 | /* Return machine mode for non-standard suffix | |
833 | or VOIDmode if non-standard suffixes are unsupported. */ | |
834 | enum machine_mode (*mode_for_suffix) (char); | |
835 | } c; | |
836 | ||
4185ae53 PB |
837 | /* Functions specific to the C++ frontend. */ |
838 | struct cxx { | |
839 | /* Return the integer type used for guard variables. */ | |
840 | tree (*guard_type) (void); | |
841 | /* Return true if only the low bit of the guard should be tested. */ | |
842 | bool (*guard_mask_bit) (void); | |
46e995e0 PB |
843 | /* Returns the size of the array cookie for an array of type. */ |
844 | tree (*get_cookie_size) (tree); | |
845 | /* Returns true if the element size should be stored in the | |
846 | array cookie. */ | |
847 | bool (*cookie_has_size) (void); | |
d59c7b4b NC |
848 | /* Allows backends to perform additional processing when |
849 | deciding if a class should be exported or imported. */ | |
850 | int (*import_export_class) (tree, int); | |
44d10c10 PB |
851 | /* Returns true if constructors and destructors return "this". */ |
852 | bool (*cdtor_returns_this) (void); | |
af287697 MM |
853 | /* Returns true if the key method for a class can be an inline |
854 | function, so long as it is not declared inline in the class | |
855 | itself. Returning true is the behavior required by the Itanium | |
856 | C++ ABI. */ | |
857 | bool (*key_method_may_be_inline) (void); | |
1e731102 MM |
858 | /* DECL is a virtual table, virtual table table, typeinfo object, |
859 | or other similar implicit class data object that will be | |
860 | emitted with external linkage in this translation unit. No ELF | |
861 | visibility has been explicitly specified. If the target needs | |
862 | to specify a visibility other than that of the containing class, | |
863 | use this hook to set DECL_VISIBILITY and | |
083cad55 | 864 | DECL_VISIBILITY_SPECIFIED. */ |
1e731102 MM |
865 | void (*determine_class_data_visibility) (tree decl); |
866 | /* Returns true (the default) if virtual tables and other | |
867 | similar implicit class data objects are always COMDAT if they | |
868 | have external linkage. If this hook returns false, then | |
869 | class data for classes whose virtual table will be emitted in | |
870 | only one translation unit will not be COMDAT. */ | |
871 | bool (*class_data_always_comdat) (void); | |
157600d0 GK |
872 | /* Returns true (the default) if the RTTI for the basic types, |
873 | which is always defined in the C++ runtime, should be COMDAT; | |
874 | false if it should not be COMDAT. */ | |
875 | bool (*library_rtti_comdat) (void); | |
9f62c3e3 PB |
876 | /* Returns true if __aeabi_atexit should be used to register static |
877 | destructors. */ | |
878 | bool (*use_aeabi_atexit) (void); | |
97388150 DS |
879 | /* Returns true if target may use atexit in the same manner as |
880 | __cxa_atexit to register static destructors. */ | |
881 | bool (*use_atexit_for_cxa_atexit) (void); | |
43d9ad1d DS |
882 | /* TYPE is a C++ class (i.e., RECORD_TYPE or UNION_TYPE) that |
883 | has just been defined. Use this hook to make adjustments to the | |
884 | class (eg, tweak visibility or perform any other required | |
083cad55 | 885 | target modifications). */ |
43d9ad1d | 886 | void (*adjust_class_at_definition) (tree type); |
4185ae53 | 887 | } cxx; |
e0d9d0dd | 888 | |
912f2dac DB |
889 | /* For targets that need to mark extra registers as live on entry to |
890 | the function, they should define this target hook and set their | |
891 | bits in the bitmap passed in. */ | |
892 | void (*live_on_entry) (bitmap); | |
4185ae53 | 893 | |
617a1b71 PB |
894 | /* True if unwinding tables should be generated by default. */ |
895 | bool unwind_tables_default; | |
896 | ||
47754fd5 RH |
897 | /* Leave the boolean fields at the end. */ |
898 | ||
899 | /* True if arbitrary sections are supported. */ | |
900 | bool have_named_sections; | |
901 | ||
434aeebb RS |
902 | /* True if we can create zeroed data by switching to a BSS section |
903 | and then using ASM_OUTPUT_SKIP to allocate the space. */ | |
904 | bool have_switchable_bss_sections; | |
905 | ||
47754fd5 RH |
906 | /* True if "native" constructors and destructors are supported, |
907 | false if we're using collect2 for the job. */ | |
908 | bool have_ctors_dtors; | |
3d78f2e9 RH |
909 | |
910 | /* True if thread-local storage is supported. */ | |
911 | bool have_tls; | |
275b6d80 DE |
912 | |
913 | /* True if a small readonly data section is supported. */ | |
914 | bool have_srodata_section; | |
7606e68f SS |
915 | |
916 | /* True if EH frame info sections should be zero-terminated. */ | |
917 | bool terminate_dw2_eh_frame_info; | |
1bc7c5b6 ZW |
918 | |
919 | /* True if #NO_APP should be emitted at the beginning of | |
920 | assembly output. */ | |
921 | bool file_start_app_off; | |
922 | ||
923 | /* True if output_file_directive should be called for main_input_filename | |
924 | at the beginning of assembly output. */ | |
925 | bool file_start_file_directive; | |
61f71b34 | 926 | |
84b8b0e0 ZW |
927 | /* True if #pragma redefine_extname is to be supported. */ |
928 | bool handle_pragma_redefine_extname; | |
929 | ||
930 | /* True if #pragma extern_prefix is to be supported. */ | |
931 | bool handle_pragma_extern_prefix; | |
932 | ||
445cf5eb JM |
933 | /* True if the target is allowed to reorder memory accesses unless |
934 | synchronization is explicitly requested. */ | |
935 | bool relaxed_ordering; | |
936 | ||
617a1b71 PB |
937 | /* Returns true if we should generate exception tables for use with the |
938 | ARM EABI. The effects the encoding of function exception specifications. | |
939 | */ | |
940 | bool arm_eabi_unwinder; | |
941 | ||
42ba5130 | 942 | /* Leave the boolean fields at the end. */ |
672a6f42 NB |
943 | }; |
944 | ||
f6897b10 | 945 | extern struct gcc_target targetm; |
59587b18 | 946 | |
1f1d5130 MS |
947 | struct gcc_targetcm { |
948 | /* Handle target switch CODE (an OPT_* value). ARG is the argument | |
949 | passed to the switch; it is NULL if no argument was. VALUE is the | |
950 | value of ARG if CODE specifies a UInteger option, otherwise it is | |
951 | 1 if the positive form of the switch was used and 0 if the negative | |
952 | form was. Return true if the switch was valid. */ | |
953 | bool (*handle_c_option) (size_t code, const char *arg, int value); | |
954 | }; | |
955 | ||
956 | /* Each target can provide their own. */ | |
957 | extern struct gcc_targetcm targetcm; | |
958 | ||
59587b18 | 959 | #endif /* GCC_TARGET_H */ |