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672a6f42 | 1 | /* Data structure definitions for a generic GCC target. |
f913c102 | 2 | Copyright (C) 2001, 2002 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 NB |
46 | |
47 | struct gcc_target | |
48 | { | |
08c148a8 NB |
49 | /* Functions that output assembler for the target. */ |
50 | struct asm_out | |
51 | { | |
17b53c33 NB |
52 | /* Opening and closing parentheses for asm expression grouping. */ |
53 | const char *open_paren, *close_paren; | |
54 | ||
301d03af RS |
55 | /* Assembler instructions for creating various kinds of integer object. */ |
56 | const char *byte_op; | |
57 | struct asm_int_op | |
58 | { | |
59 | const char *hi; | |
60 | const char *si; | |
61 | const char *di; | |
62 | const char *ti; | |
63 | } aligned_op, unaligned_op; | |
64 | ||
65 | /* Try to output the assembler code for an integer object whose | |
66 | value is given by X. SIZE is the size of the object in bytes and | |
67 | ALIGNED_P indicates whether it is aligned. Return true if | |
68 | successful. Only handles cases for which BYTE_OP, ALIGNED_OP | |
69 | and UNALIGNED_OP are NULL. */ | |
70 | bool (* integer) PARAMS ((rtx x, unsigned int size, int aligned_p)); | |
71 | ||
5eb99654 KG |
72 | /* Output code that will globalize a label. */ |
73 | void (* globalize_label) PARAMS ((FILE *, const char *)); | |
74 | ||
93638d7a AM |
75 | /* Emit an assembler directive to set visibility for the symbol |
76 | associated with the tree decl. */ | |
77 | void (* visibility) PARAMS ((tree, const char *)); | |
78 | ||
08c148a8 NB |
79 | /* Output the assembler code for entry to a function. */ |
80 | void (* function_prologue) PARAMS ((FILE *, HOST_WIDE_INT)); | |
81 | ||
b4c25db2 NB |
82 | /* Output the assembler code for end of prologue. */ |
83 | void (* function_end_prologue) PARAMS ((FILE *)); | |
84 | ||
85 | /* Output the assembler code for start of epilogue. */ | |
86 | void (* function_begin_epilogue) PARAMS ((FILE *)); | |
87 | ||
08c148a8 NB |
88 | /* Output the assembler code for function exit. */ |
89 | void (* function_epilogue) PARAMS ((FILE *, HOST_WIDE_INT)); | |
7c262518 | 90 | |
715bdd29 RH |
91 | /* Switch to an arbitrary section NAME with attributes as |
92 | specified by FLAGS. */ | |
93 | void (* named_section) PARAMS ((const char *, unsigned int)); | |
2cc07db4 | 94 | |
07c9d2eb SS |
95 | /* Switch to the section that holds the exception table. */ |
96 | void (* exception_section) PARAMS ((void)); | |
97 | ||
98 | /* Switch to the section that holds the exception frames. */ | |
99 | void (* eh_frame_section) PARAMS ((void)); | |
100 | ||
ae46c4e0 RH |
101 | /* Select and switch to a section for EXP. It may be a DECL or a |
102 | constant for which TREE_CST_RTL is valid. RELOC is non-zero if | |
103 | runtime relocations must be applied; bit 1 will be set if the | |
104 | runtime relocations require non-local name resolution. ALIGN is | |
105 | the required alignment of the data. */ | |
106 | void (* select_section) PARAMS ((tree, int, unsigned HOST_WIDE_INT)); | |
107 | ||
b64a1b53 RH |
108 | /* Select and switch to a section for X with MODE. ALIGN is |
109 | the desired alignment of the data. */ | |
110 | void (* select_rtx_section) PARAMS ((enum machine_mode, rtx, | |
111 | unsigned HOST_WIDE_INT)); | |
112 | ||
ae46c4e0 RH |
113 | /* Select a unique section name for DECL. RELOC is the same as |
114 | for SELECT_SECTION. */ | |
115 | void (* unique_section) PARAMS ((tree, int)); | |
116 | ||
2cc07db4 | 117 | /* Output a constructor for a symbol with a given priority. */ |
c237e94a | 118 | void (* constructor) PARAMS ((rtx, int)); |
2cc07db4 RH |
119 | |
120 | /* Output a destructor for a symbol with a given priority. */ | |
c237e94a | 121 | void (* destructor) PARAMS ((rtx, int)); |
08c148a8 NB |
122 | } asm_out; |
123 | ||
c237e94a ZW |
124 | /* Functions relating to instruction scheduling. */ |
125 | struct sched | |
126 | { | |
127 | /* Given the current cost, COST, of an insn, INSN, calculate and | |
128 | return a new cost based on its relationship to DEP_INSN through | |
129 | the dependence LINK. The default is to make no adjustment. */ | |
130 | int (* adjust_cost) PARAMS ((rtx insn, rtx link, rtx def_insn, int cost)); | |
131 | ||
132 | /* Adjust the priority of an insn as you see fit. Returns the new | |
133 | priority. */ | |
134 | int (* adjust_priority) PARAMS ((rtx, int)); | |
135 | ||
136 | /* Function which returns the maximum number of insns that can be | |
137 | scheduled in the same machine cycle. This must be constant | |
138 | over an entire compilation. The default is 1. */ | |
139 | int (* issue_rate) PARAMS ((void)); | |
140 | ||
141 | /* Calculate how much this insn affects how many more insns we | |
142 | can emit this cycle. Default is they all cost the same. */ | |
143 | int (* variable_issue) PARAMS ((FILE *, int, rtx, int)); | |
41077ce4 | 144 | |
c237e94a ZW |
145 | /* Initialize machine-dependent scheduling code. */ |
146 | void (* md_init) PARAMS ((FILE *, int, int)); | |
147 | ||
148 | /* Finalize machine-dependent scheduling code. */ | |
149 | void (* md_finish) PARAMS ((FILE *, int)); | |
150 | ||
151 | /* Reorder insns in a machine-dependent fashion, in two different | |
152 | places. Default does nothing. */ | |
153 | int (* reorder) PARAMS ((FILE *, int, rtx *, int *, int)); | |
154 | int (* reorder2) PARAMS ((FILE *, int, rtx *, int *, int)); | |
155 | ||
fae15c93 VM |
156 | /* The following member value is a pointer to a function returning |
157 | nonzero if we should use DFA based scheduling. The default is | |
158 | to use the old pipeline scheduler. */ | |
159 | int (* use_dfa_pipeline_interface) PARAMS ((void)); | |
160 | /* The values of all the following members are used only for the | |
161 | DFA based scheduler: */ | |
162 | /* The values of the following four members are pointers to | |
163 | functions used to simplify the automaton descriptions. | |
164 | dfa_pre_cycle_insn and dfa_post_cycle_insn give functions | |
165 | returning insns which are used to change the pipeline hazard | |
166 | recognizer state when the new simulated processor cycle | |
167 | correspondingly starts and finishes. The function defined by | |
168 | init_dfa_pre_cycle_insn and init_dfa_post_cycle_insn are used | |
169 | to initialize the corresponding insns. The default values of | |
170 | the memebers result in not changing the automaton state when | |
171 | the new simulated processor cycle correspondingly starts and | |
172 | finishes. */ | |
173 | void (* init_dfa_pre_cycle_insn) PARAMS ((void)); | |
174 | rtx (* dfa_pre_cycle_insn) PARAMS ((void)); | |
175 | void (* init_dfa_post_cycle_insn) PARAMS ((void)); | |
176 | rtx (* dfa_post_cycle_insn) PARAMS ((void)); | |
177 | /* The following member value is a pointer to a function returning value | |
178 | which defines how many insns in queue `ready' will we try for | |
179 | multi-pass scheduling. if the member value is nonzero and the | |
180 | function returns positive value, the DFA based scheduler will make | |
181 | multi-pass scheduling for the first cycle. In other words, we will | |
182 | try to choose ready insn which permits to start maximum number of | |
183 | insns on the same cycle. */ | |
184 | int (* first_cycle_multipass_dfa_lookahead) PARAMS ((void)); | |
185 | /* The values of the following members are pointers to functions | |
186 | used to improve the first cycle multipass scheduling by | |
187 | inserting nop insns. dfa_scheduler_bubble gives a function | |
188 | returning a nop insn with given index. The indexes start with | |
189 | zero. The function should return NULL if there are no more nop | |
190 | insns with indexes greater than given index. To initialize the | |
191 | nop insn the function given by member | |
192 | init_dfa_scheduler_bubbles is used. The default values of the | |
193 | members result in not inserting nop insns during the multipass | |
194 | scheduling. */ | |
195 | void (* init_dfa_bubbles) PARAMS ((void)); | |
196 | rtx (* dfa_bubble) PARAMS ((int)); | |
c237e94a ZW |
197 | } sched; |
198 | ||
672a6f42 NB |
199 | /* Given two decls, merge their attributes and return the result. */ |
200 | tree (* merge_decl_attributes) PARAMS ((tree, tree)); | |
201 | ||
202 | /* Given two types, merge their attributes and return the result. */ | |
203 | tree (* merge_type_attributes) PARAMS ((tree, tree)); | |
204 | ||
349ae713 NB |
205 | /* Table of machine attributes and functions to handle them. |
206 | Ignored if NULL. */ | |
91d231cb | 207 | const struct attribute_spec *attribute_table; |
8d8e52be JM |
208 | |
209 | /* Return zero if the attributes on TYPE1 and TYPE2 are incompatible, | |
210 | one if they are compatible and two if they are nearly compatible | |
211 | (which causes a warning to be generated). */ | |
212 | int (* comp_type_attributes) PARAMS ((tree type1, tree type2)); | |
213 | ||
214 | /* Assign default attributes to the newly defined TYPE. */ | |
215 | void (* set_default_type_attributes) PARAMS ((tree type)); | |
12a68f1f JM |
216 | |
217 | /* Insert attributes on the newly created DECL. */ | |
218 | void (* insert_attributes) PARAMS ((tree decl, tree *attributes)); | |
f6155fda | 219 | |
91d231cb JM |
220 | /* Return true if FNDECL (which has at least one machine attribute) |
221 | can be inlined despite its machine attributes, false otherwise. */ | |
222 | bool (* function_attribute_inlinable_p) PARAMS ((tree fndecl)); | |
223 | ||
f913c102 AO |
224 | /* Return true if bitfields in RECORD_TYPE should follow the |
225 | Microsoft Visual C++ bitfield layout rules. */ | |
226 | bool (* ms_bitfield_layout_p) PARAMS ((tree record_type)); | |
227 | ||
f6155fda SS |
228 | /* Set up target-specific built-in functions. */ |
229 | void (* init_builtins) PARAMS ((void)); | |
230 | ||
231 | /* Expand a target-specific builtin. */ | |
c237e94a ZW |
232 | rtx (* expand_builtin) PARAMS ((tree exp, rtx target, rtx subtarget, |
233 | enum machine_mode mode, int ignore)); | |
7c262518 RH |
234 | |
235 | /* Given a decl, a section name, and whether the decl initializer | |
236 | has relocs, choose attributes for the section. */ | |
237 | /* ??? Should be merged with SELECT_SECTION and UNIQUE_SECTION. */ | |
238 | unsigned int (* section_type_flags) PARAMS ((tree, const char *, int)); | |
239 | ||
e4ec2cac AO |
240 | /* True if new jumps cannot be created, to replace existing ones or |
241 | not, at the current point in the compilation. */ | |
242 | bool (* cannot_modify_jumps_p) PARAMS ((void)); | |
ae46c4e0 RH |
243 | |
244 | /* True if EXP should be placed in a "small data" section. */ | |
245 | bool (* in_small_data_p) PARAMS ((tree)); | |
fb49053f | 246 | |
47754fd5 RH |
247 | /* True if EXP names an object for which name resolution must resolve |
248 | to the current module. */ | |
249 | bool (* binds_local_p) PARAMS ((tree)); | |
250 | ||
fb49053f RH |
251 | /* Do something target-specific to record properties of the DECL into |
252 | the associated SYMBOL_REF. */ | |
253 | void (* encode_section_info) PARAMS ((tree, int)); | |
772c5265 RH |
254 | |
255 | /* Undo the effects of encode_section_info on the symbol string. */ | |
256 | const char * (* strip_name_encoding) PARAMS ((const char *)); | |
47754fd5 RH |
257 | |
258 | /* Leave the boolean fields at the end. */ | |
259 | ||
260 | /* True if arbitrary sections are supported. */ | |
261 | bool have_named_sections; | |
262 | ||
263 | /* True if "native" constructors and destructors are supported, | |
264 | false if we're using collect2 for the job. */ | |
265 | bool have_ctors_dtors; | |
3d78f2e9 RH |
266 | |
267 | /* True if thread-local storage is supported. */ | |
268 | bool have_tls; | |
275b6d80 DE |
269 | |
270 | /* True if a small readonly data section is supported. */ | |
271 | bool have_srodata_section; | |
7606e68f SS |
272 | |
273 | /* True if EH frame info sections should be zero-terminated. */ | |
274 | bool terminate_dw2_eh_frame_info; | |
672a6f42 NB |
275 | }; |
276 | ||
f6897b10 | 277 | extern struct gcc_target targetm; |