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672a6f42 | 1 | /* Data structure definitions for a generic GCC target. |
3cc82eea | 2 | Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. |
672a6f42 NB |
3 | |
4 | This program is free software; you can redistribute it and/or modify it | |
5 | under the terms of the GNU General Public License as published by the | |
6 | Free Software Foundation; either version 2, or (at your option) any | |
7 | later version. | |
8 | ||
9 | This program is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | GNU General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU General Public License | |
15 | along with this program; if not, write to the Free Software | |
366ccddb | 16 | Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
672a6f42 NB |
17 | |
18 | In other words, you are welcome to use, share and improve this program. | |
19 | You are forbidden to forbid anyone else to use, share and improve | |
20 | what you give them. Help stamp out software-hoarding! */ | |
21 | ||
22 | /* This file contains a data structure that describes a GCC target. | |
17b53c33 | 23 | At present it is incomplete, but in future it should grow to |
672a6f42 NB |
24 | contain most or all target machine and target O/S specific |
25 | information. | |
26 | ||
27 | This structure has its initializer declared in target-def.h in the | |
28 | form of large macro TARGET_INITIALIZER that expands to many smaller | |
29 | macros. | |
30 | ||
31 | The smaller macros each initialize one component of the structure, | |
32 | and each has a default. Each target should have a file that | |
33 | includes target.h and target-def.h, and overrides any inappropriate | |
34 | defaults by undefining the relevant macro and defining a suitable | |
35 | replacement. That file should then contain the definition of | |
f6897b10 | 36 | "targetm" like so: |
672a6f42 | 37 | |
f6897b10 | 38 | struct gcc_target targetm = TARGET_INITIALIZER; |
672a6f42 NB |
39 | |
40 | Doing things this way allows us to bring together everything that | |
17b53c33 NB |
41 | defines a GCC target. By supplying a default that is appropriate |
42 | to most targets, we can easily add new items without needing to | |
43 | edit dozens of target configuration files. It should also allow us | |
44 | to gradually reduce the amount of conditional compilation that is | |
45 | scattered throughout GCC. */ | |
672a6f42 | 46 | |
59587b18 JQ |
47 | #ifndef GCC_TARGET_H |
48 | #define GCC_TARGET_H | |
49 | ||
7bb1ad93 | 50 | #include "tm.h" |
59587b18 | 51 | #include "insn-modes.h" |
7bb1ad93 | 52 | |
9d30f3c1 | 53 | struct stdarg_info; |
496d7bb0 | 54 | struct spec_info_def; |
9d30f3c1 | 55 | |
8a99f6f9 R |
56 | /* The struct used by the secondary_reload target hook. */ |
57 | typedef struct secondary_reload_info | |
58 | { | |
59 | /* icode is actually an enum insn_code, but we don't want to force every | |
60 | file that includes target.h to include optabs.h . */ | |
61 | int icode; | |
62 | int extra_cost; /* Cost for using (a) scratch register(s) to be taken | |
63 | into account by copy_cost. */ | |
64 | /* The next two members are for the use of the backward | |
65 | compatibility hook. */ | |
66 | struct secondary_reload_info *prev_sri; | |
67 | int t_icode; /* Actually an enum insn_code - see above. */ | |
68 | } secondary_reload_info; | |
69 | ||
70 | ||
672a6f42 NB |
71 | struct gcc_target |
72 | { | |
08c148a8 NB |
73 | /* Functions that output assembler for the target. */ |
74 | struct asm_out | |
75 | { | |
17b53c33 NB |
76 | /* Opening and closing parentheses for asm expression grouping. */ |
77 | const char *open_paren, *close_paren; | |
78 | ||
301d03af RS |
79 | /* Assembler instructions for creating various kinds of integer object. */ |
80 | const char *byte_op; | |
81 | struct asm_int_op | |
82 | { | |
83 | const char *hi; | |
84 | const char *si; | |
85 | const char *di; | |
86 | const char *ti; | |
87 | } aligned_op, unaligned_op; | |
88 | ||
89 | /* Try to output the assembler code for an integer object whose | |
90 | value is given by X. SIZE is the size of the object in bytes and | |
91 | ALIGNED_P indicates whether it is aligned. Return true if | |
92 | successful. Only handles cases for which BYTE_OP, ALIGNED_OP | |
93 | and UNALIGNED_OP are NULL. */ | |
46c5ad27 | 94 | bool (* integer) (rtx x, unsigned int size, int aligned_p); |
301d03af | 95 | |
5eb99654 | 96 | /* Output code that will globalize a label. */ |
46c5ad27 | 97 | void (* globalize_label) (FILE *, const char *); |
5eb99654 | 98 | |
4746cf84 MA |
99 | /* Output code that will emit a label for unwind info, if this |
100 | target requires such labels. Second argument is the decl the | |
eeab4d81 MS |
101 | unwind info is associated with, third is a boolean: true if |
102 | this is for exception handling, fourth is a boolean: true if | |
9cf737f8 | 103 | this is only a placeholder for an omitted FDE. */ |
eeab4d81 | 104 | void (* unwind_label) (FILE *, tree, int, int); |
4746cf84 | 105 | |
083cad55 EC |
106 | /* Output code that will emit a label to divide up the exception |
107 | table. */ | |
108 | void (* except_table_label) (FILE *); | |
109 | ||
951120ea PB |
110 | /* Emit any directives required to unwind this instruction. */ |
111 | void (* unwind_emit) (FILE *, rtx); | |
112 | ||
4977bab6 | 113 | /* Output an internal label. */ |
46c5ad27 | 114 | void (* internal_label) (FILE *, const char *, unsigned long); |
4977bab6 | 115 | |
617a1b71 PB |
116 | /* Emit a ttype table reference to a typeinfo object. */ |
117 | bool (* ttype) (rtx); | |
118 | ||
93638d7a AM |
119 | /* Emit an assembler directive to set visibility for the symbol |
120 | associated with the tree decl. */ | |
46c5ad27 | 121 | void (* visibility) (tree, int); |
93638d7a | 122 | |
08c148a8 | 123 | /* Output the assembler code for entry to a function. */ |
46c5ad27 | 124 | void (* function_prologue) (FILE *, HOST_WIDE_INT); |
08c148a8 | 125 | |
b4c25db2 | 126 | /* Output the assembler code for end of prologue. */ |
46c5ad27 | 127 | void (* function_end_prologue) (FILE *); |
b4c25db2 NB |
128 | |
129 | /* Output the assembler code for start of epilogue. */ | |
46c5ad27 | 130 | void (* function_begin_epilogue) (FILE *); |
b4c25db2 | 131 | |
08c148a8 | 132 | /* Output the assembler code for function exit. */ |
46c5ad27 | 133 | void (* function_epilogue) (FILE *, HOST_WIDE_INT); |
7c262518 | 134 | |
d6b5193b RS |
135 | /* Initialize target-specific sections. */ |
136 | void (* init_sections) (void); | |
137 | ||
c18a5b6c MM |
138 | /* Tell assembler to change to section NAME with attributes FLAGS. |
139 | If DECL is non-NULL, it is the VAR_DECL or FUNCTION_DECL with | |
140 | which this section is associated. */ | |
141 | void (* named_section) (const char *name, unsigned int flags, tree decl); | |
2cc07db4 | 142 | |
d6b5193b RS |
143 | /* Return a section for EXP. It may be a DECL or a constant. RELOC |
144 | is nonzero if runtime relocations must be applied; bit 1 will be | |
145 | set if the runtime relocations require non-local name resolution. | |
146 | ALIGN is the required alignment of the data. */ | |
147 | section *(* select_section) (tree, int, unsigned HOST_WIDE_INT); | |
ae46c4e0 | 148 | |
d6b5193b RS |
149 | /* Return a section for X. MODE is X's mode and ALIGN is its |
150 | alignment in bits. */ | |
151 | section *(* select_rtx_section) (enum machine_mode, rtx, | |
152 | unsigned HOST_WIDE_INT); | |
b64a1b53 | 153 | |
ae46c4e0 RH |
154 | /* Select a unique section name for DECL. RELOC is the same as |
155 | for SELECT_SECTION. */ | |
46c5ad27 | 156 | void (* unique_section) (tree, int); |
ae46c4e0 | 157 | |
d6b5193b RS |
158 | /* Return the readonly data section associated with function DECL. */ |
159 | section *(* function_rodata_section) (tree); | |
ab5c8549 | 160 | |
2cc07db4 | 161 | /* Output a constructor for a symbol with a given priority. */ |
46c5ad27 | 162 | void (* constructor) (rtx, int); |
2cc07db4 RH |
163 | |
164 | /* Output a destructor for a symbol with a given priority. */ | |
46c5ad27 | 165 | void (* destructor) (rtx, int); |
483ab821 | 166 | |
3961e8fe RH |
167 | /* Output the assembler code for a thunk function. THUNK_DECL is the |
168 | declaration for the thunk function itself, FUNCTION is the decl for | |
169 | the target function. DELTA is an immediate constant offset to be | |
476c5eb6 | 170 | added to THIS. If VCALL_OFFSET is nonzero, the word at |
3961e8fe | 171 | *(*this + vcall_offset) should be added to THIS. */ |
46c5ad27 AJ |
172 | void (* output_mi_thunk) (FILE *file, tree thunk_decl, |
173 | HOST_WIDE_INT delta, HOST_WIDE_INT vcall_offset, | |
174 | tree function_decl); | |
3961e8fe RH |
175 | |
176 | /* Determine whether output_mi_thunk would succeed. */ | |
177 | /* ??? Ideally, this hook would not exist, and success or failure | |
178 | would be returned from output_mi_thunk directly. But there's | |
179 | too much undo-able setup involved in invoking output_mi_thunk. | |
180 | Could be fixed by making output_mi_thunk emit rtl instead of | |
181 | text to the output file. */ | |
46c5ad27 AJ |
182 | bool (* can_output_mi_thunk) (tree thunk_decl, HOST_WIDE_INT delta, |
183 | HOST_WIDE_INT vcall_offset, | |
184 | tree function_decl); | |
a5fe455b | 185 | |
1bc7c5b6 ZW |
186 | /* Output any boilerplate text needed at the beginning of a |
187 | translation unit. */ | |
46c5ad27 | 188 | void (*file_start) (void); |
1bc7c5b6 ZW |
189 | |
190 | /* Output any boilerplate text needed at the end of a | |
191 | translation unit. */ | |
46c5ad27 | 192 | void (*file_end) (void); |
6773a41c RO |
193 | |
194 | /* Output an assembler pseudo-op to declare a library function name | |
195 | external. */ | |
196 | void (*external_libcall) (rtx); | |
8e3e233b DP |
197 | |
198 | /* Output an assembler directive to mark decl live. This instructs | |
199 | linker to not dead code strip this symbol. */ | |
200 | void (*mark_decl_preserved) (const char *); | |
201 | ||
aacd3885 RS |
202 | /* Output the definition of a section anchor. */ |
203 | void (*output_anchor) (rtx); | |
204 | ||
fdbe66f2 EB |
205 | /* Output a DTP-relative reference to a TLS symbol. */ |
206 | void (*output_dwarf_dtprel) (FILE *file, int size, rtx x); | |
207 | ||
08c148a8 NB |
208 | } asm_out; |
209 | ||
c237e94a ZW |
210 | /* Functions relating to instruction scheduling. */ |
211 | struct sched | |
212 | { | |
213 | /* Given the current cost, COST, of an insn, INSN, calculate and | |
214 | return a new cost based on its relationship to DEP_INSN through | |
215 | the dependence LINK. The default is to make no adjustment. */ | |
46c5ad27 | 216 | int (* adjust_cost) (rtx insn, rtx link, rtx def_insn, int cost); |
c237e94a ZW |
217 | |
218 | /* Adjust the priority of an insn as you see fit. Returns the new | |
219 | priority. */ | |
46c5ad27 | 220 | int (* adjust_priority) (rtx, int); |
c237e94a ZW |
221 | |
222 | /* Function which returns the maximum number of insns that can be | |
223 | scheduled in the same machine cycle. This must be constant | |
224 | over an entire compilation. The default is 1. */ | |
46c5ad27 | 225 | int (* issue_rate) (void); |
c237e94a ZW |
226 | |
227 | /* Calculate how much this insn affects how many more insns we | |
228 | can emit this cycle. Default is they all cost the same. */ | |
46c5ad27 | 229 | int (* variable_issue) (FILE *, int, rtx, int); |
41077ce4 | 230 | |
c237e94a | 231 | /* Initialize machine-dependent scheduling code. */ |
46c5ad27 | 232 | void (* md_init) (FILE *, int, int); |
c237e94a ZW |
233 | |
234 | /* Finalize machine-dependent scheduling code. */ | |
46c5ad27 | 235 | void (* md_finish) (FILE *, int); |
c237e94a | 236 | |
58565a33 SKG |
237 | /* Initialize machine-dependent function while scheduling code. */ |
238 | void (* md_init_global) (FILE *, int, int); | |
239 | ||
240 | /* Finalize machine-dependent function wide scheduling code. */ | |
241 | void (* md_finish_global) (FILE *, int); | |
242 | ||
c237e94a ZW |
243 | /* Reorder insns in a machine-dependent fashion, in two different |
244 | places. Default does nothing. */ | |
46c5ad27 AJ |
245 | int (* reorder) (FILE *, int, rtx *, int *, int); |
246 | int (* reorder2) (FILE *, int, rtx *, int *, int); | |
c237e94a | 247 | |
30028c85 VM |
248 | /* The following member value is a pointer to a function called |
249 | after evaluation forward dependencies of insns in chain given | |
250 | by two parameter values (head and tail correspondingly). */ | |
46c5ad27 | 251 | void (* dependencies_evaluation_hook) (rtx, rtx); |
30028c85 | 252 | |
fae15c93 VM |
253 | /* The values of the following four members are pointers to |
254 | functions used to simplify the automaton descriptions. | |
255 | dfa_pre_cycle_insn and dfa_post_cycle_insn give functions | |
256 | returning insns which are used to change the pipeline hazard | |
257 | recognizer state when the new simulated processor cycle | |
258 | correspondingly starts and finishes. The function defined by | |
259 | init_dfa_pre_cycle_insn and init_dfa_post_cycle_insn are used | |
260 | to initialize the corresponding insns. The default values of | |
d91edf86 | 261 | the members result in not changing the automaton state when |
fae15c93 VM |
262 | the new simulated processor cycle correspondingly starts and |
263 | finishes. */ | |
46c5ad27 AJ |
264 | void (* init_dfa_pre_cycle_insn) (void); |
265 | rtx (* dfa_pre_cycle_insn) (void); | |
266 | void (* init_dfa_post_cycle_insn) (void); | |
267 | rtx (* dfa_post_cycle_insn) (void); | |
fa0aee89 | 268 | |
fae15c93 VM |
269 | /* The following member value is a pointer to a function returning value |
270 | which defines how many insns in queue `ready' will we try for | |
5ad6fca5 | 271 | multi-pass scheduling. If the member value is nonzero and the |
fae15c93 VM |
272 | function returns positive value, the DFA based scheduler will make |
273 | multi-pass scheduling for the first cycle. In other words, we will | |
274 | try to choose ready insn which permits to start maximum number of | |
275 | insns on the same cycle. */ | |
46c5ad27 | 276 | int (* first_cycle_multipass_dfa_lookahead) (void); |
fa0aee89 | 277 | |
30028c85 VM |
278 | /* The following member value is pointer to a function controlling |
279 | what insns from the ready insn queue will be considered for the | |
280 | multipass insn scheduling. If the hook returns zero for insn | |
281 | passed as the parameter, the insn will be not chosen to be | |
282 | issued. */ | |
46c5ad27 | 283 | int (* first_cycle_multipass_dfa_lookahead_guard) (rtx); |
fa0aee89 | 284 | |
30028c85 VM |
285 | /* The following member value is pointer to a function called by |
286 | the insn scheduler before issuing insn passed as the third | |
287 | parameter on given cycle. If the hook returns nonzero, the | |
288 | insn is not issued on given processors cycle. Instead of that, | |
289 | the processor cycle is advanced. If the value passed through | |
290 | the last parameter is zero, the insn ready queue is not sorted | |
291 | on the new cycle start as usually. The first parameter passes | |
292 | file for debugging output. The second one passes the scheduler | |
293 | verbose level of the debugging output. The forth and the fifth | |
294 | parameter values are correspondingly processor cycle on which | |
295 | the previous insn has been issued and the current processor | |
296 | cycle. */ | |
46c5ad27 | 297 | int (* dfa_new_cycle) (FILE *, int, rtx, int, int, int *); |
fa0aee89 | 298 | |
569fa502 DN |
299 | /* The following member value is a pointer to a function called |
300 | by the insn scheduler. It should return true if there exists a | |
f676971a EC |
301 | dependence which is considered costly by the target, between |
302 | the insn passed as the first parameter, and the insn passed as | |
303 | the second parameter. The third parameter is the INSN_DEPEND | |
569fa502 DN |
304 | link that represents the dependence between the two insns. The |
305 | fourth argument is the cost of the dependence as estimated by | |
f676971a | 306 | the scheduler. The last argument is the distance in cycles |
569fa502 | 307 | between the already scheduled insn (first parameter) and the |
80fcc7bc SB |
308 | the second insn (second parameter). */ |
309 | bool (* is_costly_dependence) (rtx, rtx, rtx, int, int); | |
496d7bb0 MK |
310 | |
311 | /* Given the current cost, COST, of an insn, INSN, calculate and | |
312 | return a new cost based on its relationship to DEP_INSN through the | |
313 | dependence of type DEP_TYPE. The default is to make no adjustment. */ | |
314 | int (* adjust_cost_2) (rtx insn, int, rtx def_insn, int cost); | |
315 | ||
316 | /* The following member value is a pointer to a function called | |
317 | by the insn scheduler. This hook is called to notify the backend | |
318 | that new instructions were emitted. */ | |
319 | void (* h_i_d_extended) (void); | |
320 | ||
321 | /* The following member value is a pointer to a function called | |
322 | by the insn scheduler. | |
323 | The first parameter is an instruction, the second parameter is the type | |
324 | of the requested speculation, and the third parameter is a pointer to the | |
325 | speculative pattern of the corresponding type (set if return value == 1). | |
326 | It should return | |
327 | -1, if there is no pattern, that will satisfy the requested speculation | |
328 | type, | |
329 | 0, if current pattern satisfies the requested speculation type, | |
330 | 1, if pattern of the instruction should be changed to the newly | |
331 | generated one. */ | |
3cc82eea | 332 | int (* speculate_insn) (rtx, HOST_WIDE_INT, rtx *); |
496d7bb0 MK |
333 | |
334 | /* The following member value is a pointer to a function called | |
335 | by the insn scheduler. It should return true if the check instruction | |
336 | corresponding to the instruction passed as the parameter needs a | |
337 | recovery block. */ | |
338 | bool (* needs_block_p) (rtx); | |
339 | ||
340 | /* The following member value is a pointer to a function called | |
341 | by the insn scheduler. It should return a pattern for the check | |
342 | instruction. | |
343 | The first parameter is a speculative instruction, the second parameter | |
344 | is the label of the corresponding recovery block (or null, if it is a | |
345 | simple check). If the mutation of the check is requested (e.g. from | |
346 | ld.c to chk.a), the third parameter is true - in this case the first | |
347 | parameter is the previous check. */ | |
348 | rtx (* gen_check) (rtx, rtx, bool); | |
349 | ||
350 | /* The following member value is a pointer to a function controlling | |
351 | what insns from the ready insn queue will be considered for the | |
352 | multipass insn scheduling. If the hook returns zero for the insn | |
353 | passed as the parameter, the insn will not be chosen to be | |
354 | issued. This hook is used to discard speculative instructions, | |
355 | that stand at the first position of the ready list. */ | |
356 | bool (* first_cycle_multipass_dfa_lookahead_guard_spec) (rtx); | |
357 | ||
358 | /* The following member value is a pointer to a function that provides | |
359 | information about the speculation capabilities of the target. | |
360 | The parameter is a pointer to spec_info variable. */ | |
361 | void (* set_sched_flags) (struct spec_info_def *); | |
c237e94a ZW |
362 | } sched; |
363 | ||
7ccf35ed DN |
364 | /* Functions relating to vectorization. */ |
365 | struct vectorize | |
366 | { | |
d16b59fa | 367 | /* The following member value is a pointer to a function called |
7ccf35ed DN |
368 | by the vectorizer, and return the decl of the target builtin |
369 | function. */ | |
370 | tree (* builtin_mask_for_load) (void); | |
7ccf35ed DN |
371 | } vectorize; |
372 | ||
75685792 RS |
373 | /* The initial value of target_flags. */ |
374 | int default_target_flags; | |
375 | ||
376 | /* Handle target switch CODE (an OPT_* value). ARG is the argument | |
377 | passed to the switch; it is NULL if no argument was. VALUE is the | |
378 | value of ARG if CODE specifies a UInteger option, otherwise it is | |
379 | 1 if the positive form of the switch was used and 0 if the negative | |
380 | form was. Return true if the switch was valid. */ | |
381 | bool (* handle_option) (size_t code, const char *arg, int value); | |
382 | ||
8c27b7d4 | 383 | /* Return machine mode for filter value. */ |
93f90be6 FJ |
384 | enum machine_mode (* eh_return_filter_mode) (void); |
385 | ||
672a6f42 | 386 | /* Given two decls, merge their attributes and return the result. */ |
46c5ad27 | 387 | tree (* merge_decl_attributes) (tree, tree); |
672a6f42 NB |
388 | |
389 | /* Given two types, merge their attributes and return the result. */ | |
46c5ad27 | 390 | tree (* merge_type_attributes) (tree, tree); |
672a6f42 | 391 | |
349ae713 NB |
392 | /* Table of machine attributes and functions to handle them. |
393 | Ignored if NULL. */ | |
91d231cb | 394 | const struct attribute_spec *attribute_table; |
8d8e52be JM |
395 | |
396 | /* Return zero if the attributes on TYPE1 and TYPE2 are incompatible, | |
397 | one if they are compatible and two if they are nearly compatible | |
398 | (which causes a warning to be generated). */ | |
46c5ad27 | 399 | int (* comp_type_attributes) (tree type1, tree type2); |
8d8e52be JM |
400 | |
401 | /* Assign default attributes to the newly defined TYPE. */ | |
46c5ad27 | 402 | void (* set_default_type_attributes) (tree type); |
12a68f1f JM |
403 | |
404 | /* Insert attributes on the newly created DECL. */ | |
46c5ad27 | 405 | void (* insert_attributes) (tree decl, tree *attributes); |
f6155fda | 406 | |
91d231cb JM |
407 | /* Return true if FNDECL (which has at least one machine attribute) |
408 | can be inlined despite its machine attributes, false otherwise. */ | |
46c5ad27 | 409 | bool (* function_attribute_inlinable_p) (tree fndecl); |
91d231cb | 410 | |
f913c102 AO |
411 | /* Return true if bitfields in RECORD_TYPE should follow the |
412 | Microsoft Visual C++ bitfield layout rules. */ | |
46c5ad27 | 413 | bool (* ms_bitfield_layout_p) (tree record_type); |
f913c102 | 414 | |
9a8ce21f JG |
415 | /* True if the target supports decimal floating point. */ |
416 | bool (* decimal_float_supported_p) (void); | |
417 | ||
13c1cd82 PB |
418 | /* Return true if anonymous bitfields affect structure alignment. */ |
419 | bool (* align_anon_bitfield) (void); | |
420 | ||
c2a64439 PB |
421 | /* Return true if volatile bitfields should use the narrowest type possible. |
422 | Return false if they should use the container type. */ | |
423 | bool (* narrow_volatile_bitfield) (void); | |
424 | ||
f6155fda | 425 | /* Set up target-specific built-in functions. */ |
46c5ad27 | 426 | void (* init_builtins) (void); |
f6155fda SS |
427 | |
428 | /* Expand a target-specific builtin. */ | |
46c5ad27 AJ |
429 | rtx (* expand_builtin) (tree exp, rtx target, rtx subtarget, |
430 | enum machine_mode mode, int ignore); | |
7c262518 | 431 | |
ee963181 RG |
432 | /* Expand a target-specific library builtin. */ |
433 | rtx (* expand_library_builtin) (tree exp, rtx target, rtx subtarget, | |
434 | enum machine_mode mode, int ignore); | |
435 | ||
58646b77 PB |
436 | /* Select a replacement for a target-specific builtin. This is done |
437 | *before* regular type checking, and so allows the target to implement | |
438 | a crude form of function overloading. The result is a complete | |
439 | expression that implements the operation. */ | |
440 | tree (*resolve_overloaded_builtin) (tree decl, tree params); | |
441 | ||
c2dda19b | 442 | /* Fold a target-specific builtin. */ |
a05a80fc | 443 | tree (* fold_builtin) (tree fndecl, tree arglist, bool ignore); |
083cad55 | 444 | |
f18eca82 ZL |
445 | /* For a vendor-specific fundamental TYPE, return a pointer to |
446 | a statically-allocated string containing the C++ mangling for | |
447 | TYPE. In all other cases, return NULL. */ | |
448 | const char * (* mangle_fundamental_type) (tree type); | |
449 | ||
c15c90bb ZW |
450 | /* Make any adjustments to libfunc names needed for this target. */ |
451 | void (* init_libfuncs) (void); | |
452 | ||
7c262518 RH |
453 | /* Given a decl, a section name, and whether the decl initializer |
454 | has relocs, choose attributes for the section. */ | |
455 | /* ??? Should be merged with SELECT_SECTION and UNIQUE_SECTION. */ | |
46c5ad27 | 456 | unsigned int (* section_type_flags) (tree, const char *, int); |
7c262518 | 457 | |
e4ec2cac AO |
458 | /* True if new jumps cannot be created, to replace existing ones or |
459 | not, at the current point in the compilation. */ | |
46c5ad27 | 460 | bool (* cannot_modify_jumps_p) (void); |
ae46c4e0 | 461 | |
a3424f5c RH |
462 | /* Return a register class for which branch target register |
463 | optimizations should be applied. */ | |
46c5ad27 | 464 | int (* branch_target_register_class) (void); |
a3424f5c RH |
465 | |
466 | /* Return true if branch target register optimizations should include | |
467 | callee-saved registers that are not already live during the current | |
468 | function. AFTER_PE_GEN is true if prologues and epilogues have | |
469 | already been generated. */ | |
46c5ad27 | 470 | bool (* branch_target_register_callee_saved) (bool after_pe_gen); |
fe3ad572 | 471 | |
3a04ff64 | 472 | /* True if the constant X cannot be placed in the constant pool. */ |
46c5ad27 | 473 | bool (* cannot_force_const_mem) (rtx); |
3a04ff64 | 474 | |
0b077eac | 475 | /* True if the insn X cannot be duplicated. */ |
46c5ad27 | 476 | bool (* cannot_copy_insn_p) (rtx); |
0b077eac | 477 | |
8ddf681a R |
478 | /* True if X is considered to be commutative. */ |
479 | bool (* commutative_p) (rtx, int); | |
480 | ||
7daebb7a | 481 | /* Given an address RTX, undo the effects of LEGITIMIZE_ADDRESS. */ |
46c5ad27 | 482 | rtx (* delegitimize_address) (rtx); |
7daebb7a | 483 | |
aacd3885 RS |
484 | /* True if the given constant can be put into an object_block. */ |
485 | bool (* use_blocks_for_constant_p) (enum machine_mode, rtx); | |
486 | ||
487 | /* The minimum and maximum byte offsets for anchored addresses. */ | |
488 | HOST_WIDE_INT min_anchor_offset; | |
489 | HOST_WIDE_INT max_anchor_offset; | |
490 | ||
491 | /* True if section anchors can be used to access the given symbol. */ | |
492 | bool (* use_anchors_for_symbol_p) (rtx); | |
493 | ||
4977bab6 ZW |
494 | /* True if it is OK to do sibling call optimization for the specified |
495 | call expression EXP. DECL will be the called function, or NULL if | |
496 | this is an indirect call. */ | |
46c5ad27 AJ |
497 | bool (*function_ok_for_sibcall) (tree decl, tree exp); |
498 | ||
ae46c4e0 | 499 | /* True if EXP should be placed in a "small data" section. */ |
46c5ad27 | 500 | bool (* in_small_data_p) (tree); |
fb49053f | 501 | |
47754fd5 RH |
502 | /* True if EXP names an object for which name resolution must resolve |
503 | to the current module. */ | |
46c5ad27 | 504 | bool (* binds_local_p) (tree); |
47754fd5 | 505 | |
fb49053f RH |
506 | /* Do something target-specific to record properties of the DECL into |
507 | the associated SYMBOL_REF. */ | |
46c5ad27 | 508 | void (* encode_section_info) (tree, rtx, int); |
772c5265 RH |
509 | |
510 | /* Undo the effects of encode_section_info on the symbol string. */ | |
46c5ad27 | 511 | const char * (* strip_name_encoding) (const char *); |
47754fd5 | 512 | |
273a2526 RS |
513 | /* If shift optabs for MODE are known to always truncate the shift count, |
514 | return the mask that they apply. Return 0 otherwise. */ | |
515 | unsigned HOST_WIDE_INT (* shift_truncation_mask) (enum machine_mode mode); | |
516 | ||
bc23502b PB |
517 | /* Return the number of divisions in the given MODE that should be present, |
518 | so that it is profitable to turn the division into a multiplication by | |
519 | the reciprocal. */ | |
520 | unsigned int (* min_divisions_for_recip_mul) (enum machine_mode mode); | |
521 | ||
3c50106f | 522 | /* True if MODE is valid for a pointer in __attribute__((mode("MODE"))). */ |
46c5ad27 | 523 | bool (* valid_pointer_mode) (enum machine_mode mode); |
3c50106f | 524 | |
6dd53648 RH |
525 | /* True if MODE is valid for the target. By "valid", we mean able to |
526 | be manipulated in non-trivial ways. In particular, this means all | |
527 | the arithmetic is supported. */ | |
528 | bool (* scalar_mode_supported_p) (enum machine_mode mode); | |
529 | ||
530 | /* Similarly for vector modes. "Supported" here is less strict. At | |
531 | least some operations are supported; need to check optabs or builtins | |
532 | for further details. */ | |
f676971a EC |
533 | bool (* vector_mode_supported_p) (enum machine_mode mode); |
534 | ||
c8e4f0e9 | 535 | /* True if a vector is opaque. */ |
46c5ad27 | 536 | bool (* vector_opaque_p) (tree); |
62e1dfcf | 537 | |
3c50106f RH |
538 | /* Compute a (partial) cost for rtx X. Return true if the complete |
539 | cost has been computed, and false if subexpressions should be | |
540 | scanned. In either case, *TOTAL contains the cost result. */ | |
541 | /* Note that CODE and OUTER_CODE ought to be RTX_CODE, but that's | |
542 | not necessarily defined at this point. */ | |
46c5ad27 | 543 | bool (* rtx_costs) (rtx x, int code, int outer_code, int *total); |
3c50106f | 544 | |
dcefdf67 RH |
545 | /* Compute the cost of X, used as an address. Never called with |
546 | invalid addresses. */ | |
46c5ad27 | 547 | int (* address_cost) (rtx x); |
dcefdf67 | 548 | |
b48f503c KK |
549 | /* Return where to allocate pseudo for a given hard register initial |
550 | value. */ | |
551 | rtx (* allocate_initial_value) (rtx x); | |
552 | ||
96714395 AH |
553 | /* Given a register, this hook should return a parallel of registers |
554 | to represent where to find the register pieces. Define this hook | |
555 | if the register and its mode are represented in Dwarf in | |
556 | non-contiguous locations, or if the register should be | |
557 | represented in more than one register in Dwarf. Otherwise, this | |
558 | hook should return NULL_RTX. */ | |
46c5ad27 | 559 | rtx (* dwarf_register_span) (rtx); |
96714395 | 560 | |
e129d93a ILT |
561 | /* Fetch the fixed register(s) which hold condition codes, for |
562 | targets where it makes sense to look for duplicate assignments to | |
563 | the condition codes. This should return true if there is such a | |
564 | register, false otherwise. The arguments should be set to the | |
565 | fixed register numbers. Up to two condition code registers are | |
566 | supported. If there is only one for this target, the int pointed | |
567 | at by the second argument should be set to -1. */ | |
568 | bool (* fixed_condition_code_regs) (unsigned int *, unsigned int *); | |
569 | ||
570 | /* If two condition code modes are compatible, return a condition | |
571 | code mode which is compatible with both, such that a comparison | |
572 | done in the returned mode will work for both of the original | |
573 | modes. If the condition code modes are not compatible, return | |
574 | VOIDmode. */ | |
575 | enum machine_mode (* cc_modes_compatible) (enum machine_mode, | |
576 | enum machine_mode); | |
577 | ||
18dbd950 RS |
578 | /* Do machine-dependent code transformations. Called just before |
579 | delayed-branch scheduling. */ | |
46c5ad27 | 580 | void (* machine_dependent_reorg) (void); |
18dbd950 | 581 | |
c35d187f RH |
582 | /* Create the __builtin_va_list type. */ |
583 | tree (* build_builtin_va_list) (void); | |
584 | ||
cdc3ddb8 RH |
585 | /* Gimplifies a VA_ARG_EXPR. */ |
586 | tree (* gimplify_va_arg_expr) (tree valist, tree type, tree *pre_p, | |
587 | tree *post_p); | |
588 | ||
7bb1ad93 GK |
589 | /* Validity-checking routines for PCH files, target-specific. |
590 | get_pch_validity returns a pointer to the data to be stored, | |
591 | and stores the size in its argument. pch_valid_p gets the same | |
592 | information back and returns NULL if the PCH is valid, | |
593 | or an error message if not. | |
594 | */ | |
595 | void * (* get_pch_validity) (size_t *); | |
596 | const char * (* pch_valid_p) (const void *, size_t); | |
597 | ||
8d932be3 RS |
598 | /* If nonnull, this function checks whether a PCH file with the |
599 | given set of target flags can be used. It returns NULL if so, | |
600 | otherwise it returns an error message. */ | |
601 | const char *(*check_pch_target_flags) (int); | |
602 | ||
a841ab8b | 603 | /* True if the compiler should give an enum type only as many |
221ee7c9 KH |
604 | bytes as it takes to represent the range of possible values of |
605 | that type. */ | |
606 | bool (* default_short_enums) (void); | |
607 | ||
d6da68b9 | 608 | /* This target hook returns an rtx that is used to store the address |
a841ab8b | 609 | of the current frame into the built-in setjmp buffer. */ |
d6da68b9 KH |
610 | rtx (* builtin_setjmp_frame_value) (void); |
611 | ||
67dfe110 | 612 | /* This target hook should add STRING_CST trees for any hard regs |
61158923 HPN |
613 | the port wishes to automatically clobber for an asm. */ |
614 | tree (* md_asm_clobbers) (tree, tree, tree); | |
67dfe110 | 615 | |
a1c496cb EC |
616 | /* This target hook allows the backend to specify a calling convention |
617 | in the debug information. This function actually returns an | |
618 | enum dwarf_calling_convention, but because of forward declarations | |
619 | and not wanting to include dwarf2.h everywhere target.h is included | |
620 | the function is being declared as an int. */ | |
621 | int (* dwarf_calling_convention) (tree); | |
622 | ||
e54c7471 EB |
623 | /* This target hook allows the backend to emit frame-related insns that |
624 | contain UNSPECs or UNSPEC_VOLATILEs. The call frame debugging info | |
625 | engine will invoke it on insns of the form | |
626 | (set (reg) (unspec [...] UNSPEC_INDEX)) | |
627 | and | |
628 | (set (reg) (unspec_volatile [...] UNSPECV_INDEX)) | |
629 | to let the backend emit the call frame instructions. */ | |
630 | void (* dwarf_handle_frame_unspec) (const char *, rtx, int); | |
631 | ||
9d30f3c1 JJ |
632 | /* Perform architecture specific checking of statements gimplified |
633 | from VA_ARG_EXPR. LHS is left hand side of MODIFY_EXPR, RHS | |
634 | is right hand side. Returns true if the statements doesn't need | |
635 | to be checked for va_list references. */ | |
7d69de61 RH |
636 | bool (* stdarg_optimize_hook) (struct stdarg_info *ai, tree lhs, tree rhs); |
637 | ||
638 | /* This target hook allows the operating system to override the DECL | |
639 | that represents the external variable that contains the stack | |
640 | protection guard variable. The type of this DECL is ptr_type_node. */ | |
641 | tree (* stack_protect_guard) (void); | |
642 | ||
643 | /* This target hook allows the operating system to override the CALL_EXPR | |
644 | that is invoked when a check vs the guard variable fails. */ | |
645 | tree (* stack_protect_fail) (void); | |
9d30f3c1 | 646 | |
e7e64a25 AS |
647 | /* Returns NULL if target supports the insn within a doloop block, |
648 | otherwise it returns an error message. */ | |
649 | const char * (*invalid_within_doloop) (rtx); | |
43d9ad1d DS |
650 | |
651 | /* DECL is a variable or function with __attribute__((dllimport)) | |
652 | specified. Use this hook if the target needs to add extra validation | |
653 | checks to handle_dll_attribute (). */ | |
654 | bool (* valid_dllimport_attribute_p) (tree decl); | |
083cad55 | 655 | |
42ba5130 RH |
656 | /* Functions relating to calls - argument passing, returns, etc. */ |
657 | struct calls { | |
658 | bool (*promote_function_args) (tree fntype); | |
659 | bool (*promote_function_return) (tree fntype); | |
660 | bool (*promote_prototypes) (tree fntype); | |
661 | rtx (*struct_value_rtx) (tree fndecl, int incoming); | |
662 | bool (*return_in_memory) (tree type, tree fndecl); | |
663 | bool (*return_in_msb) (tree type); | |
8cd5a4e0 RH |
664 | |
665 | /* Return true if a parameter must be passed by reference. TYPE may | |
666 | be null if this is a libcall. CA may be null if this query is | |
667 | from __builtin_va_arg. */ | |
668 | bool (*pass_by_reference) (CUMULATIVE_ARGS *ca, enum machine_mode mode, | |
669 | tree type, bool named_arg); | |
670 | ||
42ba5130 RH |
671 | rtx (*expand_builtin_saveregs) (void); |
672 | /* Returns pretend_argument_size. */ | |
673 | void (*setup_incoming_varargs) (CUMULATIVE_ARGS *ca, enum machine_mode mode, | |
674 | tree type, int *pretend_arg_size, | |
675 | int second_time); | |
676 | bool (*strict_argument_naming) (CUMULATIVE_ARGS *ca); | |
677 | /* Returns true if we should use | |
678 | targetm.calls.setup_incoming_varargs() and/or | |
679 | targetm.calls.strict_argument_naming(). */ | |
680 | bool (*pretend_outgoing_varargs_named) (CUMULATIVE_ARGS *ca); | |
681 | ||
682 | /* Given a complex type T, return true if a parameter of type T | |
683 | should be passed as two scalars. */ | |
684 | bool (* split_complex_arg) (tree type); | |
fe984136 RH |
685 | |
686 | /* Return true if type T, mode MODE, may not be passed in registers, | |
687 | but must be passed on the stack. */ | |
688 | /* ??? This predicate should be applied strictly after pass-by-reference. | |
689 | Need audit to verify that this is the case. */ | |
690 | bool (* must_pass_in_stack) (enum machine_mode mode, tree t); | |
6cdd5672 RH |
691 | |
692 | /* Return true if type TYPE, mode MODE, which is passed by reference, | |
693 | should have the object copy generated by the callee rather than | |
694 | the caller. It is never called for TYPE requiring constructors. */ | |
695 | bool (* callee_copies) (CUMULATIVE_ARGS *ca, enum machine_mode mode, | |
696 | tree type, bool named); | |
78a52f11 RH |
697 | |
698 | /* Return zero for arguments passed entirely on the stack or entirely | |
699 | in registers. If passed in both, return the number of bytes passed | |
700 | in registers; the balance is therefore passed on the stack. */ | |
701 | int (* arg_partial_bytes) (CUMULATIVE_ARGS *ca, enum machine_mode mode, | |
702 | tree type, bool named); | |
4d3e6fae FJ |
703 | |
704 | /* Return the diagnostic message string if function without a prototype | |
705 | is not allowed for this 'val' argument; NULL otherwise. */ | |
083cad55 | 706 | const char *(*invalid_arg_for_unprototyped_fn) (tree typelist, |
4d3e6fae | 707 | tree funcdecl, tree val); |
1d636cc6 RG |
708 | |
709 | /* Return an rtx for the return value location of the function | |
710 | specified by FN_DECL_OR_TYPE with a return type of RET_TYPE. */ | |
711 | rtx (*function_value) (tree ret_type, tree fn_decl_or_type, | |
712 | bool outgoing); | |
150cdc9e RH |
713 | |
714 | /* Return an rtx for the argument pointer incoming to the | |
715 | current function. */ | |
716 | rtx (*internal_arg_pointer) (void); | |
42ba5130 RH |
717 | } calls; |
718 | ||
4de67c26 JM |
719 | /* Return the diagnostic message string if conversion from FROMTYPE |
720 | to TOTYPE is not allowed, NULL otherwise. */ | |
721 | const char *(*invalid_conversion) (tree fromtype, tree totype); | |
722 | ||
723 | /* Return the diagnostic message string if the unary operation OP is | |
724 | not permitted on TYPE, NULL otherwise. */ | |
725 | const char *(*invalid_unary_op) (int op, tree type); | |
726 | ||
727 | /* Return the diagnostic message string if the binary operation OP | |
728 | is not permitted on TYPE1 and TYPE2, NULL otherwise. */ | |
729 | const char *(*invalid_binary_op) (int op, tree type1, tree type2); | |
730 | ||
8a99f6f9 R |
731 | /* Return the class for a secondary reload, and fill in extra information. */ |
732 | enum reg_class (*secondary_reload) (bool, rtx, enum reg_class, | |
733 | enum machine_mode, | |
734 | struct secondary_reload_info *); | |
735 | ||
4185ae53 PB |
736 | /* Functions specific to the C++ frontend. */ |
737 | struct cxx { | |
738 | /* Return the integer type used for guard variables. */ | |
739 | tree (*guard_type) (void); | |
740 | /* Return true if only the low bit of the guard should be tested. */ | |
741 | bool (*guard_mask_bit) (void); | |
46e995e0 PB |
742 | /* Returns the size of the array cookie for an array of type. */ |
743 | tree (*get_cookie_size) (tree); | |
744 | /* Returns true if the element size should be stored in the | |
745 | array cookie. */ | |
746 | bool (*cookie_has_size) (void); | |
d59c7b4b NC |
747 | /* Allows backends to perform additional processing when |
748 | deciding if a class should be exported or imported. */ | |
749 | int (*import_export_class) (tree, int); | |
44d10c10 PB |
750 | /* Returns true if constructors and destructors return "this". */ |
751 | bool (*cdtor_returns_this) (void); | |
af287697 MM |
752 | /* Returns true if the key method for a class can be an inline |
753 | function, so long as it is not declared inline in the class | |
754 | itself. Returning true is the behavior required by the Itanium | |
755 | C++ ABI. */ | |
756 | bool (*key_method_may_be_inline) (void); | |
1e731102 MM |
757 | /* DECL is a virtual table, virtual table table, typeinfo object, |
758 | or other similar implicit class data object that will be | |
759 | emitted with external linkage in this translation unit. No ELF | |
760 | visibility has been explicitly specified. If the target needs | |
761 | to specify a visibility other than that of the containing class, | |
762 | use this hook to set DECL_VISIBILITY and | |
083cad55 | 763 | DECL_VISIBILITY_SPECIFIED. */ |
1e731102 MM |
764 | void (*determine_class_data_visibility) (tree decl); |
765 | /* Returns true (the default) if virtual tables and other | |
766 | similar implicit class data objects are always COMDAT if they | |
767 | have external linkage. If this hook returns false, then | |
768 | class data for classes whose virtual table will be emitted in | |
769 | only one translation unit will not be COMDAT. */ | |
770 | bool (*class_data_always_comdat) (void); | |
9f62c3e3 PB |
771 | /* Returns true if __aeabi_atexit should be used to register static |
772 | destructors. */ | |
773 | bool (*use_aeabi_atexit) (void); | |
43d9ad1d DS |
774 | /* TYPE is a C++ class (i.e., RECORD_TYPE or UNION_TYPE) that |
775 | has just been defined. Use this hook to make adjustments to the | |
776 | class (eg, tweak visibility or perform any other required | |
083cad55 | 777 | target modifications). */ |
43d9ad1d | 778 | void (*adjust_class_at_definition) (tree type); |
4185ae53 | 779 | } cxx; |
912f2dac DB |
780 | |
781 | /* For targets that need to mark extra registers as live on entry to | |
782 | the function, they should define this target hook and set their | |
783 | bits in the bitmap passed in. */ | |
784 | void (*live_on_entry) (bitmap); | |
4185ae53 | 785 | |
617a1b71 PB |
786 | /* True if unwinding tables should be generated by default. */ |
787 | bool unwind_tables_default; | |
788 | ||
47754fd5 RH |
789 | /* Leave the boolean fields at the end. */ |
790 | ||
791 | /* True if arbitrary sections are supported. */ | |
792 | bool have_named_sections; | |
793 | ||
434aeebb RS |
794 | /* True if we can create zeroed data by switching to a BSS section |
795 | and then using ASM_OUTPUT_SKIP to allocate the space. */ | |
796 | bool have_switchable_bss_sections; | |
797 | ||
47754fd5 RH |
798 | /* True if "native" constructors and destructors are supported, |
799 | false if we're using collect2 for the job. */ | |
800 | bool have_ctors_dtors; | |
3d78f2e9 RH |
801 | |
802 | /* True if thread-local storage is supported. */ | |
803 | bool have_tls; | |
275b6d80 DE |
804 | |
805 | /* True if a small readonly data section is supported. */ | |
806 | bool have_srodata_section; | |
7606e68f SS |
807 | |
808 | /* True if EH frame info sections should be zero-terminated. */ | |
809 | bool terminate_dw2_eh_frame_info; | |
1bc7c5b6 ZW |
810 | |
811 | /* True if #NO_APP should be emitted at the beginning of | |
812 | assembly output. */ | |
813 | bool file_start_app_off; | |
814 | ||
815 | /* True if output_file_directive should be called for main_input_filename | |
816 | at the beginning of assembly output. */ | |
817 | bool file_start_file_directive; | |
61f71b34 | 818 | |
84b8b0e0 ZW |
819 | /* True if #pragma redefine_extname is to be supported. */ |
820 | bool handle_pragma_redefine_extname; | |
821 | ||
822 | /* True if #pragma extern_prefix is to be supported. */ | |
823 | bool handle_pragma_extern_prefix; | |
824 | ||
445cf5eb JM |
825 | /* True if the target is allowed to reorder memory accesses unless |
826 | synchronization is explicitly requested. */ | |
827 | bool relaxed_ordering; | |
828 | ||
617a1b71 PB |
829 | /* Returns true if we should generate exception tables for use with the |
830 | ARM EABI. The effects the encoding of function exception specifications. | |
831 | */ | |
832 | bool arm_eabi_unwinder; | |
833 | ||
42ba5130 | 834 | /* Leave the boolean fields at the end. */ |
672a6f42 NB |
835 | }; |
836 | ||
f6897b10 | 837 | extern struct gcc_target targetm; |
59587b18 JQ |
838 | |
839 | #endif /* GCC_TARGET_H */ |