gcc-4_9-branch/gcc/target.h

   1 /* Data structure definitions for a generic GCC target.
   2    Copyright (C) 2001-2014 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 #include "insn-codes.h"
  53 #include "double-int.h"
  54
  55 #ifdef ENABLE_CHECKING
  56
  57 struct cumulative_args_t { void *magic; void *p; };
  58
  59 #else /* !ENABLE_CHECKING */
  60
  61 /* When using a GCC build compiler, we could use
  62    __attribute__((transparent_union)) to get cumulative_args_t function
  63    arguments passed like scalars where the ABI would mandate a less
  64    efficient way of argument passing otherwise.  However, that would come
  65    at the cost of less type-safe !ENABLE_CHECKING compilation.  */
  66
  67 union cumulative_args_t { void *p; };
  68
  69 #endif /* !ENABLE_CHECKING */
  70
  71 /* Types used by the record_gcc_switches() target function.  */
  72 enum print_switch_type
  73 {
  74   SWITCH_TYPE_PASSED,           /* A switch passed on the command line.  */
  75   SWITCH_TYPE_ENABLED,          /* An option that is currently enabled.  */
  76   SWITCH_TYPE_DESCRIPTIVE,      /* Descriptive text, not a switch or option.  */
  77   SWITCH_TYPE_LINE_START,       /* Please emit any necessary text at the start of a line.  */
  78   SWITCH_TYPE_LINE_END          /* Please emit a line terminator.  */
  79 };
  80
  81 /* Types of memory operation understood by the "by_pieces" infrastructure.
  82    Used by the TARGET_USE_BY_PIECES_INFRASTRUCTURE_P target hook.  */
  83
  84 enum by_pieces_operation
  85 {
  86   CLEAR_BY_PIECES,
  87   MOVE_BY_PIECES,
  88   SET_BY_PIECES,
  89   STORE_BY_PIECES
  90 };
  91
  92 typedef int (* print_switch_fn_type) (print_switch_type, const char *);
  93
  94 /* An example implementation for ELF targets.  Defined in varasm.c  */
  95 extern int elf_record_gcc_switches (print_switch_type type, const char *);
  96
  97 /* Some places still assume that all pointer or address modes are the
  98    standard Pmode and ptr_mode.  These optimizations become invalid if
  99    the target actually supports multiple different modes.  For now,
 100    we disable such optimizations on such targets, using this function.  */
 101 extern bool target_default_pointer_address_modes_p (void);
 102
 103 struct stdarg_info;
 104 struct spec_info_def;
 105 struct hard_reg_set_container;
 106 struct cgraph_node;
 107 struct cgraph_simd_clone;
 108
 109 /* The struct used by the secondary_reload target hook.  */
 110 struct secondary_reload_info
 111 {
 112   /* icode is actually an enum insn_code, but we don't want to force every
 113      file that includes target.h to include optabs.h .  */
 114   int icode;
 115   int extra_cost; /* Cost for using (a) scratch register(s) to be taken
 116                      into account by copy_cost.  */
 117   /* The next two members are for the use of the backward
 118      compatibility hook.  */
 119   struct secondary_reload_info *prev_sri;
 120   int t_icode; /* Actually an enum insn_code - see above.  */
 121 };
 122
 123 /* This is defined in sched-int.h .  */
 124 struct _dep;
 125
 126 /* This is defined in ddg.h .  */
 127 struct ddg;
 128
 129 /* This is defined in cfgloop.h .  */
 130 struct loop;
 131
 132 /* This is defined in tree-ssa-alias.h.  */
 133 struct ao_ref;
 134
 135 /* This is defined in tree-vectorizer.h.  */
 136 struct _stmt_vec_info;
 137
 138 /* These are defined in tree-vect-stmts.c.  */
 139 extern tree stmt_vectype (struct _stmt_vec_info *);
 140 extern bool stmt_in_inner_loop_p (struct _stmt_vec_info *);
 141
 142 /* Assembler instructions for creating various kinds of integer object.  */
 143
 144 struct asm_int_op
 145 {
 146   const char *hi;
 147   const char *si;
 148   const char *di;
 149   const char *ti;
 150 };
 151
 152 /* Types of costs for vectorizer cost model.  */
 153 enum vect_cost_for_stmt
 154 {
 155   scalar_stmt,
 156   scalar_load,
 157   scalar_store,
 158   vector_stmt,
 159   vector_load,
 160   unaligned_load,
 161   unaligned_store,
 162   vector_store,
 163   vec_to_scalar,
 164   scalar_to_vec,
 165   cond_branch_not_taken,
 166   cond_branch_taken,
 167   vec_perm,
 168   vec_promote_demote,
 169   vec_construct
 170 };
 171
 172 /* Separate locations for which the vectorizer cost model should
 173    track costs.  */
 174 enum vect_cost_model_location {
 175   vect_prologue = 0,
 176   vect_body = 1,
 177   vect_epilogue = 2
 178 };
 179
 180 /* The target structure.  This holds all the backend hooks.  */
 181 #define DEFHOOKPOD(NAME, DOC, TYPE, INIT) TYPE NAME;
 182 #define DEFHOOK(NAME, DOC, TYPE, PARAMS, INIT) TYPE (* NAME) PARAMS;
 183 #define DEFHOOK_UNDOC DEFHOOK
 184 #define HOOKSTRUCT(FRAGMENT) FRAGMENT
 185
 186 #include "target.def"
 187
 188 extern struct gcc_target targetm;
 189
 190 #ifdef GCC_TM_H
 191
 192 #ifndef CUMULATIVE_ARGS_MAGIC
 193 #define CUMULATIVE_ARGS_MAGIC ((void *) &targetm.calls)
 194 #endif
 195
 196 static inline CUMULATIVE_ARGS *
 197 get_cumulative_args (cumulative_args_t arg)
 198 {
 199 #ifdef ENABLE_CHECKING
 200   gcc_assert (arg.magic == CUMULATIVE_ARGS_MAGIC);
 201 #endif /* ENABLE_CHECKING */
 202   return (CUMULATIVE_ARGS *) arg.p;
 203 }
 204
 205 static inline cumulative_args_t
 206 pack_cumulative_args (CUMULATIVE_ARGS *arg)
 207 {
 208   cumulative_args_t ret;
 209
 210 #ifdef ENABLE_CHECKING
 211   ret.magic = CUMULATIVE_ARGS_MAGIC;
 212 #endif /* ENABLE_CHECKING */
 213   ret.p = (void *) arg;
 214   return ret;
 215 }
 216 #endif /* GCC_TM_H */
 217
 218 #endif /* GCC_TARGET_H */