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672a6f42 | 1 | /* Data structure definitions for a generic GCC target. |
c6c81aa6 | 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 | |
16 | Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
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 JJ |
53 | struct stdarg_info; |
54 | ||
672a6f42 NB |
55 | struct gcc_target |
56 | { | |
08c148a8 NB |
57 | /* Functions that output assembler for the target. */ |
58 | struct asm_out | |
59 | { | |
17b53c33 NB |
60 | /* Opening and closing parentheses for asm expression grouping. */ |
61 | const char *open_paren, *close_paren; | |
62 | ||
301d03af RS |
63 | /* Assembler instructions for creating various kinds of integer object. */ |
64 | const char *byte_op; | |
65 | struct asm_int_op | |
66 | { | |
67 | const char *hi; | |
68 | const char *si; | |
69 | const char *di; | |
70 | const char *ti; | |
71 | } aligned_op, unaligned_op; | |
72 | ||
73 | /* Try to output the assembler code for an integer object whose | |
74 | value is given by X. SIZE is the size of the object in bytes and | |
75 | ALIGNED_P indicates whether it is aligned. Return true if | |
76 | successful. Only handles cases for which BYTE_OP, ALIGNED_OP | |
77 | and UNALIGNED_OP are NULL. */ | |
46c5ad27 | 78 | bool (* integer) (rtx x, unsigned int size, int aligned_p); |
301d03af | 79 | |
5eb99654 | 80 | /* Output code that will globalize a label. */ |
46c5ad27 | 81 | void (* globalize_label) (FILE *, const char *); |
5eb99654 | 82 | |
4746cf84 MA |
83 | /* Output code that will emit a label for unwind info, if this |
84 | target requires such labels. Second argument is the decl the | |
eeab4d81 MS |
85 | unwind info is associated with, third is a boolean: true if |
86 | this is for exception handling, fourth is a boolean: true if | |
9cf737f8 | 87 | this is only a placeholder for an omitted FDE. */ |
eeab4d81 | 88 | void (* unwind_label) (FILE *, tree, int, int); |
4746cf84 | 89 | |
951120ea PB |
90 | /* Emit any directives required to unwind this instruction. */ |
91 | void (* unwind_emit) (FILE *, rtx); | |
92 | ||
4977bab6 | 93 | /* Output an internal label. */ |
46c5ad27 | 94 | void (* internal_label) (FILE *, const char *, unsigned long); |
4977bab6 | 95 | |
93638d7a AM |
96 | /* Emit an assembler directive to set visibility for the symbol |
97 | associated with the tree decl. */ | |
46c5ad27 | 98 | void (* visibility) (tree, int); |
93638d7a | 99 | |
08c148a8 | 100 | /* Output the assembler code for entry to a function. */ |
46c5ad27 | 101 | void (* function_prologue) (FILE *, HOST_WIDE_INT); |
08c148a8 | 102 | |
b4c25db2 | 103 | /* Output the assembler code for end of prologue. */ |
46c5ad27 | 104 | void (* function_end_prologue) (FILE *); |
b4c25db2 NB |
105 | |
106 | /* Output the assembler code for start of epilogue. */ | |
46c5ad27 | 107 | void (* function_begin_epilogue) (FILE *); |
b4c25db2 | 108 | |
08c148a8 | 109 | /* Output the assembler code for function exit. */ |
46c5ad27 | 110 | void (* function_epilogue) (FILE *, HOST_WIDE_INT); |
7c262518 | 111 | |
c18a5b6c MM |
112 | /* Tell assembler to change to section NAME with attributes FLAGS. |
113 | If DECL is non-NULL, it is the VAR_DECL or FUNCTION_DECL with | |
114 | which this section is associated. */ | |
115 | void (* named_section) (const char *name, unsigned int flags, tree decl); | |
2cc07db4 | 116 | |
07c9d2eb | 117 | /* Switch to the section that holds the exception table. */ |
46c5ad27 | 118 | void (* exception_section) (void); |
07c9d2eb SS |
119 | |
120 | /* Switch to the section that holds the exception frames. */ | |
46c5ad27 | 121 | void (* eh_frame_section) (void); |
07c9d2eb | 122 | |
ae46c4e0 | 123 | /* Select and switch to a section for EXP. It may be a DECL or a |
0864034e ZW |
124 | constant. RELOC is nonzero if runtime relocations must be applied; |
125 | bit 1 will be set if the runtime relocations require non-local | |
126 | name resolution. ALIGN is the required alignment of the data. */ | |
46c5ad27 | 127 | void (* select_section) (tree, int, unsigned HOST_WIDE_INT); |
ae46c4e0 | 128 | |
b64a1b53 RH |
129 | /* Select and switch to a section for X with MODE. ALIGN is |
130 | the desired alignment of the data. */ | |
46c5ad27 AJ |
131 | void (* select_rtx_section) (enum machine_mode, rtx, |
132 | unsigned HOST_WIDE_INT); | |
b64a1b53 | 133 | |
ae46c4e0 RH |
134 | /* Select a unique section name for DECL. RELOC is the same as |
135 | for SELECT_SECTION. */ | |
46c5ad27 | 136 | void (* unique_section) (tree, int); |
ae46c4e0 | 137 | |
ab5c8549 JJ |
138 | /* Tell assembler to switch to the readonly data section associated |
139 | with function DECL. */ | |
f676971a | 140 | void (* function_rodata_section) (tree); |
ab5c8549 | 141 | |
2cc07db4 | 142 | /* Output a constructor for a symbol with a given priority. */ |
46c5ad27 | 143 | void (* constructor) (rtx, int); |
2cc07db4 RH |
144 | |
145 | /* Output a destructor for a symbol with a given priority. */ | |
46c5ad27 | 146 | void (* destructor) (rtx, int); |
483ab821 | 147 | |
3961e8fe RH |
148 | /* Output the assembler code for a thunk function. THUNK_DECL is the |
149 | declaration for the thunk function itself, FUNCTION is the decl for | |
150 | the target function. DELTA is an immediate constant offset to be | |
476c5eb6 | 151 | added to THIS. If VCALL_OFFSET is nonzero, the word at |
3961e8fe | 152 | *(*this + vcall_offset) should be added to THIS. */ |
46c5ad27 AJ |
153 | void (* output_mi_thunk) (FILE *file, tree thunk_decl, |
154 | HOST_WIDE_INT delta, HOST_WIDE_INT vcall_offset, | |
155 | tree function_decl); | |
3961e8fe RH |
156 | |
157 | /* Determine whether output_mi_thunk would succeed. */ | |
158 | /* ??? Ideally, this hook would not exist, and success or failure | |
159 | would be returned from output_mi_thunk directly. But there's | |
160 | too much undo-able setup involved in invoking output_mi_thunk. | |
161 | Could be fixed by making output_mi_thunk emit rtl instead of | |
162 | text to the output file. */ | |
46c5ad27 AJ |
163 | bool (* can_output_mi_thunk) (tree thunk_decl, HOST_WIDE_INT delta, |
164 | HOST_WIDE_INT vcall_offset, | |
165 | tree function_decl); | |
a5fe455b | 166 | |
1bc7c5b6 ZW |
167 | /* Output any boilerplate text needed at the beginning of a |
168 | translation unit. */ | |
46c5ad27 | 169 | void (*file_start) (void); |
1bc7c5b6 ZW |
170 | |
171 | /* Output any boilerplate text needed at the end of a | |
172 | translation unit. */ | |
46c5ad27 | 173 | void (*file_end) (void); |
6773a41c RO |
174 | |
175 | /* Output an assembler pseudo-op to declare a library function name | |
176 | external. */ | |
177 | void (*external_libcall) (rtx); | |
8e3e233b DP |
178 | |
179 | /* Output an assembler directive to mark decl live. This instructs | |
180 | linker to not dead code strip this symbol. */ | |
181 | void (*mark_decl_preserved) (const char *); | |
182 | ||
08c148a8 NB |
183 | } asm_out; |
184 | ||
c237e94a ZW |
185 | /* Functions relating to instruction scheduling. */ |
186 | struct sched | |
187 | { | |
188 | /* Given the current cost, COST, of an insn, INSN, calculate and | |
189 | return a new cost based on its relationship to DEP_INSN through | |
190 | the dependence LINK. The default is to make no adjustment. */ | |
46c5ad27 | 191 | int (* adjust_cost) (rtx insn, rtx link, rtx def_insn, int cost); |
c237e94a ZW |
192 | |
193 | /* Adjust the priority of an insn as you see fit. Returns the new | |
194 | priority. */ | |
46c5ad27 | 195 | int (* adjust_priority) (rtx, int); |
c237e94a ZW |
196 | |
197 | /* Function which returns the maximum number of insns that can be | |
198 | scheduled in the same machine cycle. This must be constant | |
199 | over an entire compilation. The default is 1. */ | |
46c5ad27 | 200 | int (* issue_rate) (void); |
c237e94a ZW |
201 | |
202 | /* Calculate how much this insn affects how many more insns we | |
203 | can emit this cycle. Default is they all cost the same. */ | |
46c5ad27 | 204 | int (* variable_issue) (FILE *, int, rtx, int); |
41077ce4 | 205 | |
c237e94a | 206 | /* Initialize machine-dependent scheduling code. */ |
46c5ad27 | 207 | void (* md_init) (FILE *, int, int); |
c237e94a ZW |
208 | |
209 | /* Finalize machine-dependent scheduling code. */ | |
46c5ad27 | 210 | void (* md_finish) (FILE *, int); |
c237e94a | 211 | |
58565a33 SKG |
212 | /* Initialize machine-dependent function while scheduling code. */ |
213 | void (* md_init_global) (FILE *, int, int); | |
214 | ||
215 | /* Finalize machine-dependent function wide scheduling code. */ | |
216 | void (* md_finish_global) (FILE *, int); | |
217 | ||
c237e94a ZW |
218 | /* Reorder insns in a machine-dependent fashion, in two different |
219 | places. Default does nothing. */ | |
46c5ad27 AJ |
220 | int (* reorder) (FILE *, int, rtx *, int *, int); |
221 | int (* reorder2) (FILE *, int, rtx *, int *, int); | |
c237e94a | 222 | |
30028c85 VM |
223 | /* The following member value is a pointer to a function called |
224 | after evaluation forward dependencies of insns in chain given | |
225 | by two parameter values (head and tail correspondingly). */ | |
46c5ad27 | 226 | void (* dependencies_evaluation_hook) (rtx, rtx); |
30028c85 | 227 | |
fae15c93 VM |
228 | /* The values of the following four members are pointers to |
229 | functions used to simplify the automaton descriptions. | |
230 | dfa_pre_cycle_insn and dfa_post_cycle_insn give functions | |
231 | returning insns which are used to change the pipeline hazard | |
232 | recognizer state when the new simulated processor cycle | |
233 | correspondingly starts and finishes. The function defined by | |
234 | init_dfa_pre_cycle_insn and init_dfa_post_cycle_insn are used | |
235 | to initialize the corresponding insns. The default values of | |
d91edf86 | 236 | the members result in not changing the automaton state when |
fae15c93 VM |
237 | the new simulated processor cycle correspondingly starts and |
238 | finishes. */ | |
46c5ad27 AJ |
239 | void (* init_dfa_pre_cycle_insn) (void); |
240 | rtx (* dfa_pre_cycle_insn) (void); | |
241 | void (* init_dfa_post_cycle_insn) (void); | |
242 | rtx (* dfa_post_cycle_insn) (void); | |
fa0aee89 | 243 | |
fae15c93 VM |
244 | /* The following member value is a pointer to a function returning value |
245 | which defines how many insns in queue `ready' will we try for | |
5ad6fca5 | 246 | multi-pass scheduling. If the member value is nonzero and the |
fae15c93 VM |
247 | function returns positive value, the DFA based scheduler will make |
248 | multi-pass scheduling for the first cycle. In other words, we will | |
249 | try to choose ready insn which permits to start maximum number of | |
250 | insns on the same cycle. */ | |
46c5ad27 | 251 | int (* first_cycle_multipass_dfa_lookahead) (void); |
fa0aee89 | 252 | |
30028c85 VM |
253 | /* The following member value is pointer to a function controlling |
254 | what insns from the ready insn queue will be considered for the | |
255 | multipass insn scheduling. If the hook returns zero for insn | |
256 | passed as the parameter, the insn will be not chosen to be | |
257 | issued. */ | |
46c5ad27 | 258 | int (* first_cycle_multipass_dfa_lookahead_guard) (rtx); |
fa0aee89 | 259 | |
30028c85 VM |
260 | /* The following member value is pointer to a function called by |
261 | the insn scheduler before issuing insn passed as the third | |
262 | parameter on given cycle. If the hook returns nonzero, the | |
263 | insn is not issued on given processors cycle. Instead of that, | |
264 | the processor cycle is advanced. If the value passed through | |
265 | the last parameter is zero, the insn ready queue is not sorted | |
266 | on the new cycle start as usually. The first parameter passes | |
267 | file for debugging output. The second one passes the scheduler | |
268 | verbose level of the debugging output. The forth and the fifth | |
269 | parameter values are correspondingly processor cycle on which | |
270 | the previous insn has been issued and the current processor | |
271 | cycle. */ | |
46c5ad27 | 272 | int (* dfa_new_cycle) (FILE *, int, rtx, int, int, int *); |
fa0aee89 | 273 | |
569fa502 DN |
274 | /* The following member value is a pointer to a function called |
275 | by the insn scheduler. It should return true if there exists a | |
f676971a EC |
276 | dependence which is considered costly by the target, between |
277 | the insn passed as the first parameter, and the insn passed as | |
278 | the second parameter. The third parameter is the INSN_DEPEND | |
569fa502 DN |
279 | link that represents the dependence between the two insns. The |
280 | fourth argument is the cost of the dependence as estimated by | |
f676971a | 281 | the scheduler. The last argument is the distance in cycles |
569fa502 | 282 | between the already scheduled insn (first parameter) and the |
80fcc7bc SB |
283 | the second insn (second parameter). */ |
284 | bool (* is_costly_dependence) (rtx, rtx, rtx, int, int); | |
c237e94a ZW |
285 | } sched; |
286 | ||
7ccf35ed DN |
287 | /* Functions relating to vectorization. */ |
288 | struct vectorize | |
289 | { | |
d16b59fa | 290 | /* The following member value is a pointer to a function called |
7ccf35ed DN |
291 | by the vectorizer, and return the decl of the target builtin |
292 | function. */ | |
293 | tree (* builtin_mask_for_load) (void); | |
7ccf35ed DN |
294 | } vectorize; |
295 | ||
75685792 RS |
296 | /* The initial value of target_flags. */ |
297 | int default_target_flags; | |
298 | ||
299 | /* Handle target switch CODE (an OPT_* value). ARG is the argument | |
300 | passed to the switch; it is NULL if no argument was. VALUE is the | |
301 | value of ARG if CODE specifies a UInteger option, otherwise it is | |
302 | 1 if the positive form of the switch was used and 0 if the negative | |
303 | form was. Return true if the switch was valid. */ | |
304 | bool (* handle_option) (size_t code, const char *arg, int value); | |
305 | ||
8c27b7d4 | 306 | /* Return machine mode for filter value. */ |
93f90be6 FJ |
307 | enum machine_mode (* eh_return_filter_mode) (void); |
308 | ||
672a6f42 | 309 | /* Given two decls, merge their attributes and return the result. */ |
46c5ad27 | 310 | tree (* merge_decl_attributes) (tree, tree); |
672a6f42 NB |
311 | |
312 | /* Given two types, merge their attributes and return the result. */ | |
46c5ad27 | 313 | tree (* merge_type_attributes) (tree, tree); |
672a6f42 | 314 | |
349ae713 NB |
315 | /* Table of machine attributes and functions to handle them. |
316 | Ignored if NULL. */ | |
91d231cb | 317 | const struct attribute_spec *attribute_table; |
8d8e52be JM |
318 | |
319 | /* Return zero if the attributes on TYPE1 and TYPE2 are incompatible, | |
320 | one if they are compatible and two if they are nearly compatible | |
321 | (which causes a warning to be generated). */ | |
46c5ad27 | 322 | int (* comp_type_attributes) (tree type1, tree type2); |
8d8e52be JM |
323 | |
324 | /* Assign default attributes to the newly defined TYPE. */ | |
46c5ad27 | 325 | void (* set_default_type_attributes) (tree type); |
12a68f1f JM |
326 | |
327 | /* Insert attributes on the newly created DECL. */ | |
46c5ad27 | 328 | void (* insert_attributes) (tree decl, tree *attributes); |
f6155fda | 329 | |
91d231cb JM |
330 | /* Return true if FNDECL (which has at least one machine attribute) |
331 | can be inlined despite its machine attributes, false otherwise. */ | |
46c5ad27 | 332 | bool (* function_attribute_inlinable_p) (tree fndecl); |
91d231cb | 333 | |
f913c102 AO |
334 | /* Return true if bitfields in RECORD_TYPE should follow the |
335 | Microsoft Visual C++ bitfield layout rules. */ | |
46c5ad27 | 336 | bool (* ms_bitfield_layout_p) (tree record_type); |
f913c102 | 337 | |
13c1cd82 PB |
338 | /* Return true if anonymous bitfields affect structure alignment. */ |
339 | bool (* align_anon_bitfield) (void); | |
340 | ||
f6155fda | 341 | /* Set up target-specific built-in functions. */ |
46c5ad27 | 342 | void (* init_builtins) (void); |
f6155fda SS |
343 | |
344 | /* Expand a target-specific builtin. */ | |
46c5ad27 AJ |
345 | rtx (* expand_builtin) (tree exp, rtx target, rtx subtarget, |
346 | enum machine_mode mode, int ignore); | |
7c262518 | 347 | |
c2dda19b | 348 | /* Fold a target-specific builtin. */ |
a05a80fc | 349 | tree (* fold_builtin) (tree fndecl, tree arglist, bool ignore); |
c2dda19b | 350 | |
f18eca82 ZL |
351 | /* For a vendor-specific fundamental TYPE, return a pointer to |
352 | a statically-allocated string containing the C++ mangling for | |
353 | TYPE. In all other cases, return NULL. */ | |
354 | const char * (* mangle_fundamental_type) (tree type); | |
355 | ||
c15c90bb ZW |
356 | /* Make any adjustments to libfunc names needed for this target. */ |
357 | void (* init_libfuncs) (void); | |
358 | ||
7c262518 RH |
359 | /* Given a decl, a section name, and whether the decl initializer |
360 | has relocs, choose attributes for the section. */ | |
361 | /* ??? Should be merged with SELECT_SECTION and UNIQUE_SECTION. */ | |
46c5ad27 | 362 | unsigned int (* section_type_flags) (tree, const char *, int); |
7c262518 | 363 | |
e4ec2cac AO |
364 | /* True if new jumps cannot be created, to replace existing ones or |
365 | not, at the current point in the compilation. */ | |
46c5ad27 | 366 | bool (* cannot_modify_jumps_p) (void); |
ae46c4e0 | 367 | |
a3424f5c RH |
368 | /* Return a register class for which branch target register |
369 | optimizations should be applied. */ | |
46c5ad27 | 370 | int (* branch_target_register_class) (void); |
a3424f5c RH |
371 | |
372 | /* Return true if branch target register optimizations should include | |
373 | callee-saved registers that are not already live during the current | |
374 | function. AFTER_PE_GEN is true if prologues and epilogues have | |
375 | already been generated. */ | |
46c5ad27 | 376 | bool (* branch_target_register_callee_saved) (bool after_pe_gen); |
fe3ad572 | 377 | |
3a04ff64 | 378 | /* True if the constant X cannot be placed in the constant pool. */ |
46c5ad27 | 379 | bool (* cannot_force_const_mem) (rtx); |
3a04ff64 | 380 | |
0b077eac | 381 | /* True if the insn X cannot be duplicated. */ |
46c5ad27 | 382 | bool (* cannot_copy_insn_p) (rtx); |
0b077eac | 383 | |
7daebb7a | 384 | /* Given an address RTX, undo the effects of LEGITIMIZE_ADDRESS. */ |
46c5ad27 | 385 | rtx (* delegitimize_address) (rtx); |
7daebb7a | 386 | |
4977bab6 ZW |
387 | /* True if it is OK to do sibling call optimization for the specified |
388 | call expression EXP. DECL will be the called function, or NULL if | |
389 | this is an indirect call. */ | |
46c5ad27 AJ |
390 | bool (*function_ok_for_sibcall) (tree decl, tree exp); |
391 | ||
ae46c4e0 | 392 | /* True if EXP should be placed in a "small data" section. */ |
46c5ad27 | 393 | bool (* in_small_data_p) (tree); |
fb49053f | 394 | |
47754fd5 RH |
395 | /* True if EXP names an object for which name resolution must resolve |
396 | to the current module. */ | |
46c5ad27 | 397 | bool (* binds_local_p) (tree); |
47754fd5 | 398 | |
fb49053f RH |
399 | /* Do something target-specific to record properties of the DECL into |
400 | the associated SYMBOL_REF. */ | |
46c5ad27 | 401 | void (* encode_section_info) (tree, rtx, int); |
772c5265 RH |
402 | |
403 | /* Undo the effects of encode_section_info on the symbol string. */ | |
46c5ad27 | 404 | const char * (* strip_name_encoding) (const char *); |
47754fd5 | 405 | |
273a2526 RS |
406 | /* If shift optabs for MODE are known to always truncate the shift count, |
407 | return the mask that they apply. Return 0 otherwise. */ | |
408 | unsigned HOST_WIDE_INT (* shift_truncation_mask) (enum machine_mode mode); | |
409 | ||
3c50106f | 410 | /* True if MODE is valid for a pointer in __attribute__((mode("MODE"))). */ |
46c5ad27 | 411 | bool (* valid_pointer_mode) (enum machine_mode mode); |
3c50106f | 412 | |
6dd53648 RH |
413 | /* True if MODE is valid for the target. By "valid", we mean able to |
414 | be manipulated in non-trivial ways. In particular, this means all | |
415 | the arithmetic is supported. */ | |
416 | bool (* scalar_mode_supported_p) (enum machine_mode mode); | |
417 | ||
418 | /* Similarly for vector modes. "Supported" here is less strict. At | |
419 | least some operations are supported; need to check optabs or builtins | |
420 | for further details. */ | |
f676971a EC |
421 | bool (* vector_mode_supported_p) (enum machine_mode mode); |
422 | ||
c8e4f0e9 | 423 | /* True if a vector is opaque. */ |
46c5ad27 | 424 | bool (* vector_opaque_p) (tree); |
62e1dfcf | 425 | |
3c50106f RH |
426 | /* Compute a (partial) cost for rtx X. Return true if the complete |
427 | cost has been computed, and false if subexpressions should be | |
428 | scanned. In either case, *TOTAL contains the cost result. */ | |
429 | /* Note that CODE and OUTER_CODE ought to be RTX_CODE, but that's | |
430 | not necessarily defined at this point. */ | |
46c5ad27 | 431 | bool (* rtx_costs) (rtx x, int code, int outer_code, int *total); |
3c50106f | 432 | |
dcefdf67 RH |
433 | /* Compute the cost of X, used as an address. Never called with |
434 | invalid addresses. */ | |
46c5ad27 | 435 | int (* address_cost) (rtx x); |
dcefdf67 | 436 | |
96714395 AH |
437 | /* Given a register, this hook should return a parallel of registers |
438 | to represent where to find the register pieces. Define this hook | |
439 | if the register and its mode are represented in Dwarf in | |
440 | non-contiguous locations, or if the register should be | |
441 | represented in more than one register in Dwarf. Otherwise, this | |
442 | hook should return NULL_RTX. */ | |
46c5ad27 | 443 | rtx (* dwarf_register_span) (rtx); |
96714395 | 444 | |
e129d93a ILT |
445 | /* Fetch the fixed register(s) which hold condition codes, for |
446 | targets where it makes sense to look for duplicate assignments to | |
447 | the condition codes. This should return true if there is such a | |
448 | register, false otherwise. The arguments should be set to the | |
449 | fixed register numbers. Up to two condition code registers are | |
450 | supported. If there is only one for this target, the int pointed | |
451 | at by the second argument should be set to -1. */ | |
452 | bool (* fixed_condition_code_regs) (unsigned int *, unsigned int *); | |
453 | ||
454 | /* If two condition code modes are compatible, return a condition | |
455 | code mode which is compatible with both, such that a comparison | |
456 | done in the returned mode will work for both of the original | |
457 | modes. If the condition code modes are not compatible, return | |
458 | VOIDmode. */ | |
459 | enum machine_mode (* cc_modes_compatible) (enum machine_mode, | |
460 | enum machine_mode); | |
461 | ||
18dbd950 RS |
462 | /* Do machine-dependent code transformations. Called just before |
463 | delayed-branch scheduling. */ | |
46c5ad27 | 464 | void (* machine_dependent_reorg) (void); |
18dbd950 | 465 | |
c35d187f RH |
466 | /* Create the __builtin_va_list type. */ |
467 | tree (* build_builtin_va_list) (void); | |
468 | ||
cdc3ddb8 RH |
469 | /* Gimplifies a VA_ARG_EXPR. */ |
470 | tree (* gimplify_va_arg_expr) (tree valist, tree type, tree *pre_p, | |
471 | tree *post_p); | |
472 | ||
7bb1ad93 GK |
473 | /* Validity-checking routines for PCH files, target-specific. |
474 | get_pch_validity returns a pointer to the data to be stored, | |
475 | and stores the size in its argument. pch_valid_p gets the same | |
476 | information back and returns NULL if the PCH is valid, | |
477 | or an error message if not. | |
478 | */ | |
479 | void * (* get_pch_validity) (size_t *); | |
480 | const char * (* pch_valid_p) (const void *, size_t); | |
481 | ||
a841ab8b | 482 | /* True if the compiler should give an enum type only as many |
221ee7c9 KH |
483 | bytes as it takes to represent the range of possible values of |
484 | that type. */ | |
485 | bool (* default_short_enums) (void); | |
486 | ||
d6da68b9 | 487 | /* This target hook returns an rtx that is used to store the address |
a841ab8b | 488 | of the current frame into the built-in setjmp buffer. */ |
d6da68b9 KH |
489 | rtx (* builtin_setjmp_frame_value) (void); |
490 | ||
67dfe110 | 491 | /* This target hook should add STRING_CST trees for any hard regs |
61158923 HPN |
492 | the port wishes to automatically clobber for an asm. */ |
493 | tree (* md_asm_clobbers) (tree, tree, tree); | |
67dfe110 | 494 | |
a1c496cb EC |
495 | /* This target hook allows the backend to specify a calling convention |
496 | in the debug information. This function actually returns an | |
497 | enum dwarf_calling_convention, but because of forward declarations | |
498 | and not wanting to include dwarf2.h everywhere target.h is included | |
499 | the function is being declared as an int. */ | |
500 | int (* dwarf_calling_convention) (tree); | |
501 | ||
e54c7471 EB |
502 | /* This target hook allows the backend to emit frame-related insns that |
503 | contain UNSPECs or UNSPEC_VOLATILEs. The call frame debugging info | |
504 | engine will invoke it on insns of the form | |
505 | (set (reg) (unspec [...] UNSPEC_INDEX)) | |
506 | and | |
507 | (set (reg) (unspec_volatile [...] UNSPECV_INDEX)) | |
508 | to let the backend emit the call frame instructions. */ | |
509 | void (* dwarf_handle_frame_unspec) (const char *, rtx, int); | |
510 | ||
9d30f3c1 JJ |
511 | /* Perform architecture specific checking of statements gimplified |
512 | from VA_ARG_EXPR. LHS is left hand side of MODIFY_EXPR, RHS | |
513 | is right hand side. Returns true if the statements doesn't need | |
514 | to be checked for va_list references. */ | |
515 | bool (*stdarg_optimize_hook) (struct stdarg_info *ai, tree lhs, tree rhs); | |
516 | ||
42ba5130 RH |
517 | /* Functions relating to calls - argument passing, returns, etc. */ |
518 | struct calls { | |
519 | bool (*promote_function_args) (tree fntype); | |
520 | bool (*promote_function_return) (tree fntype); | |
521 | bool (*promote_prototypes) (tree fntype); | |
522 | rtx (*struct_value_rtx) (tree fndecl, int incoming); | |
523 | bool (*return_in_memory) (tree type, tree fndecl); | |
524 | bool (*return_in_msb) (tree type); | |
8cd5a4e0 RH |
525 | |
526 | /* Return true if a parameter must be passed by reference. TYPE may | |
527 | be null if this is a libcall. CA may be null if this query is | |
528 | from __builtin_va_arg. */ | |
529 | bool (*pass_by_reference) (CUMULATIVE_ARGS *ca, enum machine_mode mode, | |
530 | tree type, bool named_arg); | |
531 | ||
42ba5130 RH |
532 | rtx (*expand_builtin_saveregs) (void); |
533 | /* Returns pretend_argument_size. */ | |
534 | void (*setup_incoming_varargs) (CUMULATIVE_ARGS *ca, enum machine_mode mode, | |
535 | tree type, int *pretend_arg_size, | |
536 | int second_time); | |
537 | bool (*strict_argument_naming) (CUMULATIVE_ARGS *ca); | |
538 | /* Returns true if we should use | |
539 | targetm.calls.setup_incoming_varargs() and/or | |
540 | targetm.calls.strict_argument_naming(). */ | |
541 | bool (*pretend_outgoing_varargs_named) (CUMULATIVE_ARGS *ca); | |
542 | ||
543 | /* Given a complex type T, return true if a parameter of type T | |
544 | should be passed as two scalars. */ | |
545 | bool (* split_complex_arg) (tree type); | |
fe984136 RH |
546 | |
547 | /* Return true if type T, mode MODE, may not be passed in registers, | |
548 | but must be passed on the stack. */ | |
549 | /* ??? This predicate should be applied strictly after pass-by-reference. | |
550 | Need audit to verify that this is the case. */ | |
551 | bool (* must_pass_in_stack) (enum machine_mode mode, tree t); | |
6cdd5672 RH |
552 | |
553 | /* Return true if type TYPE, mode MODE, which is passed by reference, | |
554 | should have the object copy generated by the callee rather than | |
555 | the caller. It is never called for TYPE requiring constructors. */ | |
556 | bool (* callee_copies) (CUMULATIVE_ARGS *ca, enum machine_mode mode, | |
557 | tree type, bool named); | |
78a52f11 RH |
558 | |
559 | /* Return zero for arguments passed entirely on the stack or entirely | |
560 | in registers. If passed in both, return the number of bytes passed | |
561 | in registers; the balance is therefore passed on the stack. */ | |
562 | int (* arg_partial_bytes) (CUMULATIVE_ARGS *ca, enum machine_mode mode, | |
563 | tree type, bool named); | |
4d3e6fae FJ |
564 | |
565 | /* Return the diagnostic message string if function without a prototype | |
566 | is not allowed for this 'val' argument; NULL otherwise. */ | |
567 | const char *(*invalid_arg_for_unprototyped_fn) (tree typelist, | |
568 | tree funcdecl, tree val); | |
42ba5130 RH |
569 | } calls; |
570 | ||
4185ae53 PB |
571 | /* Functions specific to the C++ frontend. */ |
572 | struct cxx { | |
573 | /* Return the integer type used for guard variables. */ | |
574 | tree (*guard_type) (void); | |
575 | /* Return true if only the low bit of the guard should be tested. */ | |
576 | bool (*guard_mask_bit) (void); | |
46e995e0 PB |
577 | /* Returns the size of the array cookie for an array of type. */ |
578 | tree (*get_cookie_size) (tree); | |
579 | /* Returns true if the element size should be stored in the | |
580 | array cookie. */ | |
581 | bool (*cookie_has_size) (void); | |
d59c7b4b NC |
582 | /* Allows backends to perform additional processing when |
583 | deciding if a class should be exported or imported. */ | |
584 | int (*import_export_class) (tree, int); | |
44d10c10 PB |
585 | /* Returns true if constructors and destructors return "this". */ |
586 | bool (*cdtor_returns_this) (void); | |
af287697 MM |
587 | /* Returns true if the key method for a class can be an inline |
588 | function, so long as it is not declared inline in the class | |
589 | itself. Returning true is the behavior required by the Itanium | |
590 | C++ ABI. */ | |
591 | bool (*key_method_may_be_inline) (void); | |
1e731102 MM |
592 | /* DECL is a virtual table, virtual table table, typeinfo object, |
593 | or other similar implicit class data object that will be | |
594 | emitted with external linkage in this translation unit. No ELF | |
595 | visibility has been explicitly specified. If the target needs | |
596 | to specify a visibility other than that of the containing class, | |
597 | use this hook to set DECL_VISIBILITY and | |
598 | DECL_VISIBILITY_SPECIFIED. */ | |
599 | void (*determine_class_data_visibility) (tree decl); | |
600 | /* Returns true (the default) if virtual tables and other | |
601 | similar implicit class data objects are always COMDAT if they | |
602 | have external linkage. If this hook returns false, then | |
603 | class data for classes whose virtual table will be emitted in | |
604 | only one translation unit will not be COMDAT. */ | |
605 | bool (*class_data_always_comdat) (void); | |
9f62c3e3 PB |
606 | /* Returns true if __aeabi_atexit should be used to register static |
607 | destructors. */ | |
608 | bool (*use_aeabi_atexit) (void); | |
4185ae53 PB |
609 | } cxx; |
610 | ||
47754fd5 RH |
611 | /* Leave the boolean fields at the end. */ |
612 | ||
613 | /* True if arbitrary sections are supported. */ | |
614 | bool have_named_sections; | |
615 | ||
616 | /* True if "native" constructors and destructors are supported, | |
617 | false if we're using collect2 for the job. */ | |
618 | bool have_ctors_dtors; | |
3d78f2e9 RH |
619 | |
620 | /* True if thread-local storage is supported. */ | |
621 | bool have_tls; | |
275b6d80 DE |
622 | |
623 | /* True if a small readonly data section is supported. */ | |
624 | bool have_srodata_section; | |
7606e68f SS |
625 | |
626 | /* True if EH frame info sections should be zero-terminated. */ | |
627 | bool terminate_dw2_eh_frame_info; | |
1bc7c5b6 ZW |
628 | |
629 | /* True if #NO_APP should be emitted at the beginning of | |
630 | assembly output. */ | |
631 | bool file_start_app_off; | |
632 | ||
633 | /* True if output_file_directive should be called for main_input_filename | |
634 | at the beginning of assembly output. */ | |
635 | bool file_start_file_directive; | |
61f71b34 | 636 | |
84b8b0e0 ZW |
637 | /* True if #pragma redefine_extname is to be supported. */ |
638 | bool handle_pragma_redefine_extname; | |
639 | ||
640 | /* True if #pragma extern_prefix is to be supported. */ | |
641 | bool handle_pragma_extern_prefix; | |
642 | ||
445cf5eb JM |
643 | /* True if the target is allowed to reorder memory accesses unless |
644 | synchronization is explicitly requested. */ | |
645 | bool relaxed_ordering; | |
646 | ||
42ba5130 | 647 | /* Leave the boolean fields at the end. */ |
672a6f42 NB |
648 | }; |
649 | ||
f6897b10 | 650 | extern struct gcc_target targetm; |
59587b18 JQ |
651 | |
652 | #endif /* GCC_TARGET_H */ |