1 /* Data structure definitions for a generic GCC target.
2 Copyright (C) 2001-2013 Free Software Foundation, Inc.
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 3, 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; see the file COPYING3. If not see
16 <http://www.gnu.org/licenses/>.
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
23 /* This file contains a data structure that describes a GCC target.
24 At present it is incomplete, but in future it should grow to
25 contain most or all target machine and target O/S specific
26 information.
27
28 This structure has its initializer declared in target-def.h in the
29 form of large macro TARGET_INITIALIZER that expands to many smaller
30 macros.
31
32 The smaller macros each initialize one component of the structure,
33 and each has a default. Each target should have a file that
34 includes target.h and target-def.h, and overrides any inappropriate
35 defaults by undefining the relevant macro and defining a suitable
36 replacement. That file should then contain the definition of
37 "targetm" like so:
38
39 struct gcc_target targetm = TARGET_INITIALIZER;
40
41 Doing things this way allows us to bring together everything that
42 defines a GCC target. By supplying a default that is appropriate
43 to most targets, we can easily add new items without needing to
44 edit dozens of target configuration files. It should also allow us
45 to gradually reduce the amount of conditional compilation that is
46 scattered throughout GCC. */
47
48 #ifndef GCC_TARGET_H
49 #define GCC_TARGET_H
50
51 #include "insn-modes.h"
52
53 #ifdef ENABLE_CHECKING
54
55 typedef struct { void *magic; void *p; } cumulative_args_t;
56
57 #else /* !ENABLE_CHECKING */
58
59 /* When using a GCC build compiler, we could use
60 __attribute__((transparent_union)) to get cumulative_args_t function
61 arguments passed like scalars where the ABI would mandate a less
62 efficient way of argument passing otherwise. However, that would come
63 at the cost of less type-safe !ENABLE_CHECKING compilation. */
64
65 typedef union { void *p; } cumulative_args_t;
66
67 #endif /* !ENABLE_CHECKING */
68
69 /* Types used by the record_gcc_switches() target function. */
70 typedef enum
71 {
72 SWITCH_TYPE_PASSED, /* A switch passed on the command line. */
73 SWITCH_TYPE_ENABLED, /* An option that is currently enabled. */
74 SWITCH_TYPE_DESCRIPTIVE, /* Descriptive text, not a switch or option. */
75 SWITCH_TYPE_LINE_START, /* Please emit any necessary text at the start of a line. */
76 SWITCH_TYPE_LINE_END /* Please emit a line terminator. */
77 }
78 print_switch_type;
79
80 typedef int (* print_switch_fn_type) (print_switch_type, const char *);
81
82 /* An example implementation for ELF targets. Defined in varasm.c */
83 extern int elf_record_gcc_switches (print_switch_type type, const char *);
84
85 /* Some places still assume that all pointer or address modes are the
86 standard Pmode and ptr_mode. These optimizations become invalid if
87 the target actually supports multiple different modes. For now,
88 we disable such optimizations on such targets, using this function. */
89 extern bool target_default_pointer_address_modes_p (void);
90
91 struct stdarg_info;
92 struct spec_info_def;
93 struct hard_reg_set_container;
94
95 /* The struct used by the secondary_reload target hook. */
96 typedef struct secondary_reload_info
97 {
98 /* icode is actually an enum insn_code, but we don't want to force every
99 file that includes target.h to include optabs.h . */
100 int icode;
101 int extra_cost; /* Cost for using (a) scratch register(s) to be taken
102 into account by copy_cost. */
103 /* The next two members are for the use of the backward
104 compatibility hook. */
105 struct secondary_reload_info *prev_sri;
106 int t_icode; /* Actually an enum insn_code - see above. */
107 } secondary_reload_info;
108
109 /* This is defined in sched-int.h . */
110 struct _dep;
111
112 /* This is defined in ddg.h . */
113 struct ddg;
114
115 /* This is defined in cfgloop.h . */
116 struct loop;
117
118 /* This is defined in tree-ssa-alias.h. */
119 struct ao_ref_s;
120
121 /* This is defined in tree-vectorizer.h. */
122 struct _stmt_vec_info;
123
124 /* These are defined in tree-vect-stmts.c. */
125 extern tree stmt_vectype (struct _stmt_vec_info *);
126 extern bool stmt_in_inner_loop_p (struct _stmt_vec_info *);
127
128 /* Assembler instructions for creating various kinds of integer object. */
129
130 struct asm_int_op
131 {
132 const char *hi;
133 const char *si;
134 const char *di;
135 const char *ti;
136 };
137
138 /* Types of costs for vectorizer cost model. */
139 enum vect_cost_for_stmt
140 {
141 scalar_stmt,
142 scalar_load,
143 scalar_store,
144 vector_stmt,
145 vector_load,
146 unaligned_load,
147 unaligned_store,
148 vector_store,
149 vec_to_scalar,
150 scalar_to_vec,
151 cond_branch_not_taken,
152 cond_branch_taken,
153 vec_perm,
154 vec_promote_demote,
155 vec_construct
156 };
157
158 /* Separate locations for which the vectorizer cost model should
159 track costs. */
160 enum vect_cost_model_location {
161 vect_prologue = 0,
162 vect_body = 1,
163 vect_epilogue = 2
164 };
165
166 /* The target structure. This holds all the backend hooks. */
167 #define DEFHOOKPOD(NAME, DOC, TYPE, INIT) TYPE NAME;
168 #define DEFHOOK(NAME, DOC, TYPE, PARAMS, INIT) TYPE (* NAME) PARAMS;
169 #define DEFHOOK_UNDOC DEFHOOK
170 #define HOOKSTRUCT(FRAGMENT) FRAGMENT
171
172 #include "target.def"
173
174 extern struct gcc_target targetm;
175
176 #ifdef GCC_TM_H
177
178 #ifndef CUMULATIVE_ARGS_MAGIC
179 #define CUMULATIVE_ARGS_MAGIC ((void *) &targetm.calls)
180 #endif
181
182 static inline CUMULATIVE_ARGS *
get_cumulative_args(cumulative_args_t arg)183 get_cumulative_args (cumulative_args_t arg)
184 {
185 #ifdef ENABLE_CHECKING
186 gcc_assert (arg.magic == CUMULATIVE_ARGS_MAGIC);
187 #endif /* ENABLE_CHECKING */
188 return (CUMULATIVE_ARGS *) arg.p;
189 }
190
191 static inline cumulative_args_t
pack_cumulative_args(CUMULATIVE_ARGS * arg)192 pack_cumulative_args (CUMULATIVE_ARGS *arg)
193 {
194 cumulative_args_t ret;
195
196 #ifdef ENABLE_CHECKING
197 ret.magic = CUMULATIVE_ARGS_MAGIC;
198 #endif /* ENABLE_CHECKING */
199 ret.p = (void *) arg;
200 return ret;
201 }
202 #endif /* GCC_TM_H */
203
204 #endif /* GCC_TARGET_H */
205