gcc/ipa-prop.h

   1 /* Interprocedural analyses.
   2    Copyright (C) 2005-2015 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef IPA_PROP_H
  21 #define IPA_PROP_H
  22
  23 /* The following definitions and interfaces are used by
  24    interprocedural analyses or parameters.  */
  25
  26 #define IPA_UNDESCRIBED_USE -1
  27
  28 /* ipa-prop.c stuff (ipa-cp, indirect inlining):  */
  29
  30 /* A jump function for a callsite represents the values passed as actual
  31    arguments of the callsite.  They were originally proposed in a paper called
  32    "Interprocedural Constant Propagation", by David Callahan, Keith D Cooper,
  33    Ken Kennedy, Linda Torczon in Comp86, pg 152-161.  There are three main
  34    types of values :
  35
  36    Pass-through - the caller's formal parameter is passed as an actual
  37                   argument, possibly one simple operation performed on it.
  38    Constant     - a constant (is_gimple_ip_invariant)is passed as an actual
  39                   argument.
  40    Unknown      - neither of the above.
  41
  42    IPA_JF_ANCESTOR is a special pass-through jump function, which means that
  43    the result is an address of a part of the object pointed to by the formal
  44    parameter to which the function refers.  It is mainly intended to represent
  45    getting addresses of of ancestor fields in C++
  46    (e.g. &this_1(D)->D.1766.D.1756).  Note that if the original pointer is
  47    NULL, ancestor jump function must behave like a simple pass-through.
  48
  49    Other pass-through functions can either simply pass on an unchanged formal
  50    parameter or can apply one simple binary operation to it (such jump
  51    functions are called polynomial).
  52
  53    Jump functions are computed in ipa-prop.c by function
  54    update_call_notes_after_inlining.  Some information can be lost and jump
  55    functions degraded accordingly when inlining, see
  56    update_call_notes_after_inlining in the same file.  */
  57
  58 enum jump_func_type
  59 {
  60   IPA_JF_UNKNOWN = 0,  /* newly allocated and zeroed jump functions default */
  61   IPA_JF_CONST,             /* represented by field costant */
  62   IPA_JF_PASS_THROUGH,      /* represented by field pass_through */
  63   IPA_JF_ANCESTOR           /* represented by field ancestor */
  64 };
  65
  66 struct ipa_cst_ref_desc;
  67
  68 /* Structure holding data required to describe a constant jump function.  */
  69 struct GTY(()) ipa_constant_data
  70 {
  71   /* THe value of the constant.  */
  72   tree value;
  73   /* Pointer to the structure that describes the reference.  */
  74   struct ipa_cst_ref_desc GTY((skip)) *rdesc;
  75 };
  76
  77 /* Structure holding data required to describe a pass-through jump function.  */
  78
  79 struct GTY(()) ipa_pass_through_data
  80 {
  81   /* If an operation is to be performed on the original parameter, this is the
  82      second (constant) operand.  */
  83   tree operand;
  84   /* Number of the caller's formal parameter being passed.  */
  85   int formal_id;
  86   /* Operation that is performed on the argument before it is passed on.
  87      NOP_EXPR means no operation.  Otherwise oper must be a simple binary
  88      arithmetic operation where the caller's parameter is the first operand and
  89      operand field from this structure is the second one.  */
  90   enum tree_code operation;
  91   /* When the passed value is a pointer, it is set to true only when we are
  92      certain that no write to the object it points to has occurred since the
  93      caller functions started execution, except for changes noted in the
  94      aggregate part of the jump function (see description of
  95      ipa_agg_jump_function).  The flag is used only when the operation is
  96      NOP_EXPR.  */
  97   unsigned agg_preserved : 1;
  98 };
  99
 100 /* Structure holding data required to describe an ancestor pass-through
 101    jump function.  */
 102
 103 struct GTY(()) ipa_ancestor_jf_data
 104 {
 105   /* Offset of the field representing the ancestor.  */
 106   HOST_WIDE_INT offset;
 107   /* Number of the caller's formal parameter being passed.  */
 108   int formal_id;
 109   /* Flag with the same meaning like agg_preserve in ipa_pass_through_data.  */
 110   unsigned agg_preserved : 1;
 111 };
 112
 113 /* An element in an aggegate part of a jump function describing a known value
 114    at a given offset.  When it is part of a pass-through jump function with
 115    agg_preserved set or an ancestor jump function with agg_preserved set, all
 116    unlisted positions are assumed to be preserved but the value can be a type
 117    node, which means that the particular piece (starting at offset and having
 118    the size of the type) is clobbered with an unknown value.  When
 119    agg_preserved is false or the type of the containing jump function is
 120    different, all unlisted parts are assumed to be unknown and all values must
 121    fulfill is_gimple_ip_invariant.  */
 122
 123 struct GTY(()) ipa_agg_jf_item
 124 {
 125   /* The offset at which the known value is located within the aggregate.  */
 126   HOST_WIDE_INT offset;
 127
 128   /* The known constant or type if this is a clobber.  */
 129   tree value;
 130 };
 131
 132
 133 /* Aggregate jump function - i.e. description of contents of aggregates passed
 134    either by reference or value.  */
 135
 136 struct GTY(()) ipa_agg_jump_function
 137 {
 138   /* Description of the individual items.  */
 139   vec<ipa_agg_jf_item, va_gc> *items;
 140   /* True if the data was passed by reference (as opposed to by value). */
 141   bool by_ref;
 142 };
 143
 144 typedef struct ipa_agg_jump_function *ipa_agg_jump_function_p;
 145
 146 /* Info about pointer alignments. */
 147 struct GTY(()) ipa_alignment
 148 {
 149   /* The data fields below are valid only if known is true.  */
 150   bool known;
 151   /* See ptr_info_def and get_pointer_alignment_1 for description of these
 152      two.  */
 153   unsigned align;
 154   unsigned misalign;
 155 };
 156
 157 /* A jump function for a callsite represents the values passed as actual
 158    arguments of the callsite. See enum jump_func_type for the various
 159    types of jump functions supported.  */
 160 struct GTY (()) ipa_jump_func
 161 {
 162   /* Aggregate contants description.  See struct ipa_agg_jump_function and its
 163      description.  */
 164   struct ipa_agg_jump_function agg;
 165
 166   /* Information about alignment of pointers. */
 167   struct ipa_alignment alignment;
 168
 169   enum jump_func_type type;
 170   /* Represents a value of a jump function.  pass_through is used only in jump
 171      function context.  constant represents the actual constant in constant jump
 172      functions and member_cst holds constant c++ member functions.  */
 173   union jump_func_value
 174   {
 175     struct ipa_constant_data GTY ((tag ("IPA_JF_CONST"))) constant;
 176     struct ipa_pass_through_data GTY ((tag ("IPA_JF_PASS_THROUGH"))) pass_through;
 177     struct ipa_ancestor_jf_data GTY ((tag ("IPA_JF_ANCESTOR"))) ancestor;
 178   } GTY ((desc ("%1.type"))) value;
 179 };
 180
 181
 182 /* Return the constant stored in a constant jump functin JFUNC.  */
 183
 184 static inline tree
 185 ipa_get_jf_constant (struct ipa_jump_func *jfunc)
 186 {
 187   gcc_checking_assert (jfunc->type == IPA_JF_CONST);
 188   return jfunc->value.constant.value;
 189 }
 190
 191 static inline struct ipa_cst_ref_desc *
 192 ipa_get_jf_constant_rdesc (struct ipa_jump_func *jfunc)
 193 {
 194   gcc_checking_assert (jfunc->type == IPA_JF_CONST);
 195   return jfunc->value.constant.rdesc;
 196 }
 197
 198 /* Return the operand of a pass through jmp function JFUNC.  */
 199
 200 static inline tree
 201 ipa_get_jf_pass_through_operand (struct ipa_jump_func *jfunc)
 202 {
 203   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 204   return jfunc->value.pass_through.operand;
 205 }
 206
 207 /* Return the number of the caller's formal parameter that a pass through jump
 208    function JFUNC refers to.  */
 209
 210 static inline int
 211 ipa_get_jf_pass_through_formal_id (struct ipa_jump_func *jfunc)
 212 {
 213   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 214   return jfunc->value.pass_through.formal_id;
 215 }
 216
 217 /* Return operation of a pass through jump function JFUNC.  */
 218
 219 static inline enum tree_code
 220 ipa_get_jf_pass_through_operation (struct ipa_jump_func *jfunc)
 221 {
 222   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 223   return jfunc->value.pass_through.operation;
 224 }
 225
 226 /* Return the agg_preserved flag of a pass through jump function JFUNC.  */
 227
 228 static inline bool
 229 ipa_get_jf_pass_through_agg_preserved (struct ipa_jump_func *jfunc)
 230 {
 231   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 232   return jfunc->value.pass_through.agg_preserved;
 233 }
 234
 235 /* Return true if pass through jump function JFUNC preserves type
 236    information.  */
 237
 238 static inline bool
 239 ipa_get_jf_pass_through_type_preserved (struct ipa_jump_func *jfunc)
 240 {
 241   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 242   return jfunc->value.pass_through.agg_preserved;
 243 }
 244
 245 /* Return the offset of an ancestor jump function JFUNC.  */
 246
 247 static inline HOST_WIDE_INT
 248 ipa_get_jf_ancestor_offset (struct ipa_jump_func *jfunc)
 249 {
 250   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 251   return jfunc->value.ancestor.offset;
 252 }
 253
 254 /* Return the number of the caller's formal parameter that an ancestor jump
 255    function JFUNC refers to.  */
 256
 257 static inline int
 258 ipa_get_jf_ancestor_formal_id (struct ipa_jump_func *jfunc)
 259 {
 260   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 261   return jfunc->value.ancestor.formal_id;
 262 }
 263
 264 /* Return the agg_preserved flag of an ancestor jump function JFUNC.  */
 265
 266 static inline bool
 267 ipa_get_jf_ancestor_agg_preserved (struct ipa_jump_func *jfunc)
 268 {
 269   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 270   return jfunc->value.ancestor.agg_preserved;
 271 }
 272
 273 /* Return true if ancestor jump function JFUNC presrves type information.  */
 274
 275 static inline bool
 276 ipa_get_jf_ancestor_type_preserved (struct ipa_jump_func *jfunc)
 277 {
 278   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 279   return jfunc->value.ancestor.agg_preserved;
 280 }
 281
 282 /* Summary describing a single formal parameter.  */
 283
 284 struct ipa_param_descriptor
 285 {
 286   /* PARAM_DECL of this parameter.  */
 287   tree decl;
 288   /* If all uses of the parameter are described by ipa-prop structures, this
 289      says how many there are.  If any use could not be described by means of
 290      ipa-prop structures, this is IPA_UNDESCRIBED_USE.  */
 291   int controlled_uses;
 292   unsigned int move_cost : 31;
 293   /* The parameter is used.  */
 294   unsigned used : 1;
 295 };
 296
 297 /* ipa_node_params stores information related to formal parameters of functions
 298    and some other information for interprocedural passes that operate on
 299    parameters (such as ipa-cp).  */
 300
 301 struct ipa_node_params
 302 {
 303   ~ipa_node_params ();
 304
 305   /* Information about individual formal parameters that are gathered when
 306      summaries are generated. */
 307   vec<ipa_param_descriptor> descriptors;
 308   /* Pointer to an array of structures describing individual formal
 309      parameters.  */
 310   struct ipcp_param_lattices *lattices;
 311   /* Only for versioned nodes this field would not be NULL,
 312      it points to the node that IPA cp cloned from.  */
 313   struct cgraph_node *ipcp_orig_node;
 314   /* If this node is an ipa-cp clone, these are the known constants that
 315      describe what it has been specialized for.  */
 316   vec<tree> known_csts;
 317   /* If this node is an ipa-cp clone, these are the known polymorphic contexts
 318      that describe what it has been specialized for.  */
 319   vec<ipa_polymorphic_call_context> known_contexts;
 320   /* Whether the param uses analysis and jump function computation has already
 321      been performed.  */
 322   unsigned analysis_done : 1;
 323   /* Whether the function is enqueued in ipa-cp propagation stack.  */
 324   unsigned node_enqueued : 1;
 325   /* Whether we should create a specialized version based on values that are
 326      known to be constant in all contexts.  */
 327   unsigned do_clone_for_all_contexts : 1;
 328   /* Set if this is an IPA-CP clone for all contexts.  */
 329   unsigned is_all_contexts_clone : 1;
 330   /* Node has been completely replaced by clones and will be removed after
 331      ipa-cp is finished.  */
 332   unsigned node_dead : 1;
 333 };
 334
 335 /* ipa_node_params access functions.  Please use these to access fields that
 336    are or will be shared among various passes.  */
 337
 338 /* Return the number of formal parameters. */
 339
 340 static inline int
 341 ipa_get_param_count (struct ipa_node_params *info)
 342 {
 343   return info->descriptors.length ();
 344 }
 345
 346 /* Return the declaration of Ith formal parameter of the function corresponding
 347    to INFO.  Note there is no setter function as this array is built just once
 348    using ipa_initialize_node_params. */
 349
 350 static inline tree
 351 ipa_get_param (struct ipa_node_params *info, int i)
 352 {
 353   gcc_checking_assert (!flag_wpa);
 354   return info->descriptors[i].decl;
 355 }
 356
 357 /* Return the move cost of Ith formal parameter of the function corresponding
 358    to INFO.  */
 359
 360 static inline int
 361 ipa_get_param_move_cost (struct ipa_node_params *info, int i)
 362 {
 363   return info->descriptors[i].move_cost;
 364 }
 365
 366 /* Set the used flag corresponding to the Ith formal parameter of the function
 367    associated with INFO to VAL.  */
 368
 369 static inline void
 370 ipa_set_param_used (struct ipa_node_params *info, int i, bool val)
 371 {
 372   info->descriptors[i].used = val;
 373 }
 374
 375 /* Return how many uses described by ipa-prop a parameter has or
 376    IPA_UNDESCRIBED_USE if there is a use that is not described by these
 377    structures.  */
 378 static inline int
 379 ipa_get_controlled_uses (struct ipa_node_params *info, int i)
 380 {
 381   /* FIXME: introducing speuclation causes out of bounds access here.  */
 382   if (info->descriptors.length () > (unsigned)i)
 383     return info->descriptors[i].controlled_uses;
 384   return IPA_UNDESCRIBED_USE;
 385 }
 386
 387 /* Set the controlled counter of a given parameter.  */
 388
 389 static inline void
 390 ipa_set_controlled_uses (struct ipa_node_params *info, int i, int val)
 391 {
 392   info->descriptors[i].controlled_uses = val;
 393 }
 394
 395 /* Return the used flag corresponding to the Ith formal parameter of the
 396    function associated with INFO.  */
 397
 398 static inline bool
 399 ipa_is_param_used (struct ipa_node_params *info, int i)
 400 {
 401   return info->descriptors[i].used;
 402 }
 403
 404 /* Information about replacements done in aggregates for a given node (each
 405    node has its linked list).  */
 406 struct GTY(()) ipa_agg_replacement_value
 407 {
 408   /* Next item in the linked list.  */
 409   struct ipa_agg_replacement_value *next;
 410   /* Offset within the aggregate.  */
 411   HOST_WIDE_INT offset;
 412   /* The constant value.  */
 413   tree value;
 414   /* The paramter index.  */
 415   int index;
 416   /* Whether the value was passed by reference.  */
 417   bool by_ref;
 418 };
 419
 420 /* Structure holding information for the transformation phase of IPA-CP.  */
 421
 422 struct GTY(()) ipcp_transformation_summary
 423 {
 424   /* Linked list of known aggregate values.  */
 425   ipa_agg_replacement_value *agg_values;
 426   /* Alignment information for pointers.  */
 427   vec<ipa_alignment, va_gc> *alignments;
 428 };
 429
 430 void ipa_set_node_agg_value_chain (struct cgraph_node *node,
 431                                    struct ipa_agg_replacement_value *aggvals);
 432 void ipcp_grow_transformations_if_necessary (void);
 433
 434 /* ipa_edge_args stores information related to a callsite and particularly its
 435    arguments.  It can be accessed by the IPA_EDGE_REF macro.  */
 436 struct GTY(()) ipa_edge_args
 437 {
 438   /* Vector of the callsite's jump function of each parameter.  */
 439   vec<ipa_jump_func, va_gc> *jump_functions;
 440   vec<ipa_polymorphic_call_context, va_gc> *polymorphic_call_contexts;
 441 };
 442
 443 /* ipa_edge_args access functions.  Please use these to access fields that
 444    are or will be shared among various passes.  */
 445
 446 /* Return the number of actual arguments. */
 447
 448 static inline int
 449 ipa_get_cs_argument_count (struct ipa_edge_args *args)
 450 {
 451   return vec_safe_length (args->jump_functions);
 452 }
 453
 454 /* Returns a pointer to the jump function for the ith argument.  Please note
 455    there is no setter function as jump functions are all set up in
 456    ipa_compute_jump_functions. */
 457
 458 static inline struct ipa_jump_func *
 459 ipa_get_ith_jump_func (struct ipa_edge_args *args, int i)
 460 {
 461   return &(*args->jump_functions)[i];
 462 }
 463
 464 /* Returns a pointer to the polymorphic call context for the ith argument.
 465    NULL if contexts are not computed.  */
 466 static inline struct ipa_polymorphic_call_context *
 467 ipa_get_ith_polymorhic_call_context (struct ipa_edge_args *args, int i)
 468 {
 469   if (!args->polymorphic_call_contexts)
 470     return NULL;
 471   return &(*args->polymorphic_call_contexts)[i];
 472 }
 473
 474 /* Function summary for ipa_node_params.  */
 475 class ipa_node_params_t: public function_summary <ipa_node_params *>
 476 {
 477 public:
 478   ipa_node_params_t (symbol_table *table):
 479     function_summary<ipa_node_params *> (table) { }
 480
 481   /* Hook that is called by summary when a node is duplicated.  */
 482   virtual void duplicate (cgraph_node *node,
 483                           cgraph_node *node2,
 484                           ipa_node_params *data,
 485                           ipa_node_params *data2);
 486 };
 487
 488 /* Function summary where the parameter infos are actually stored. */
 489 extern ipa_node_params_t *ipa_node_params_sum;
 490 /* Vector of IPA-CP transformation data for each clone.  */
 491 extern GTY(()) vec<ipcp_transformation_summary, va_gc> *ipcp_transformations;
 492 /* Vector where the parameter infos are actually stored. */
 493 extern GTY(()) vec<ipa_edge_args, va_gc> *ipa_edge_args_vector;
 494
 495 /* Return the associated parameter/argument info corresponding to the given
 496    node/edge.  */
 497 #define IPA_NODE_REF(NODE) (ipa_node_params_sum->get (NODE))
 498 #define IPA_EDGE_REF(EDGE) (&(*ipa_edge_args_vector)[(EDGE)->uid])
 499 /* This macro checks validity of index returned by
 500    ipa_get_param_decl_index function.  */
 501 #define IS_VALID_JUMP_FUNC_INDEX(I) ((I) != -1)
 502
 503 /* Creating and freeing ipa_node_params and ipa_edge_args.  */
 504 void ipa_create_all_node_params (void);
 505 void ipa_create_all_edge_args (void);
 506 void ipa_free_edge_args_substructures (struct ipa_edge_args *);
 507 void ipa_free_all_node_params (void);
 508 void ipa_free_all_edge_args (void);
 509 void ipa_free_all_structures_after_ipa_cp (void);
 510 void ipa_free_all_structures_after_iinln (void);
 511
 512 void ipa_register_cgraph_hooks (void);
 513 int count_formal_params (tree fndecl);
 514
 515 /* This function ensures the array of node param infos is big enough to
 516    accommodate a structure for all nodes and reallocates it if not.  */
 517
 518 static inline void
 519 ipa_check_create_node_params (void)
 520 {
 521   if (!ipa_node_params_sum)
 522     ipa_node_params_sum = new ipa_node_params_t (symtab);
 523 }
 524
 525 /* This function ensures the array of edge arguments infos is big enough to
 526    accommodate a structure for all edges and reallocates it if not.  */
 527
 528 static inline void
 529 ipa_check_create_edge_args (void)
 530 {
 531   if (vec_safe_length (ipa_edge_args_vector)
 532       <= (unsigned) symtab->edges_max_uid)
 533     vec_safe_grow_cleared (ipa_edge_args_vector, symtab->edges_max_uid + 1);
 534 }
 535
 536 /* Returns true if the array of edge infos is large enough to accommodate an
 537    info for EDGE.  The main purpose of this function is that debug dumping
 538    function can check info availability without causing reallocations.  */
 539
 540 static inline bool
 541 ipa_edge_args_info_available_for_edge_p (struct cgraph_edge *edge)
 542 {
 543   return ((unsigned) edge->uid < vec_safe_length (ipa_edge_args_vector));
 544 }
 545
 546 static inline ipcp_transformation_summary *
 547 ipcp_get_transformation_summary (cgraph_node *node)
 548 {
 549   if ((unsigned) node->uid >= vec_safe_length (ipcp_transformations))
 550     return NULL;
 551   return &(*ipcp_transformations)[node->uid];
 552 }
 553
 554 /* Return the aggregate replacements for NODE, if there are any.  */
 555
 556 static inline struct ipa_agg_replacement_value *
 557 ipa_get_agg_replacements_for_node (cgraph_node *node)
 558 {
 559   ipcp_transformation_summary *ts = ipcp_get_transformation_summary (node);
 560   return ts ? ts->agg_values : NULL;
 561 }
 562
 563 /* Function formal parameters related computations.  */
 564 void ipa_initialize_node_params (struct cgraph_node *node);
 565 bool ipa_propagate_indirect_call_infos (struct cgraph_edge *cs,
 566                                         vec<cgraph_edge *> *new_edges);
 567
 568 /* Indirect edge and binfo processing.  */
 569 tree ipa_get_indirect_edge_target (struct cgraph_edge *ie,
 570                                    vec<tree> ,
 571                                    vec<ipa_polymorphic_call_context>,
 572                                    vec<ipa_agg_jump_function_p>,
 573                                    bool *);
 574 struct cgraph_edge *ipa_make_edge_direct_to_target (struct cgraph_edge *, tree,
 575                                                     bool speculative = false);
 576 tree ipa_impossible_devirt_target (struct cgraph_edge *, tree);
 577
 578 /* Functions related to both.  */
 579 void ipa_analyze_node (struct cgraph_node *);
 580
 581 /* Aggregate jump function related functions.  */
 582 tree ipa_find_agg_cst_for_param (struct ipa_agg_jump_function *, HOST_WIDE_INT,
 583                                  bool);
 584 bool ipa_load_from_parm_agg (struct ipa_node_params *, gimple, tree, int *,
 585                              HOST_WIDE_INT *, bool *);
 586
 587 /* Debugging interface.  */
 588 void ipa_print_node_params (FILE *, struct cgraph_node *node);
 589 void ipa_print_all_params (FILE *);
 590 void ipa_print_node_jump_functions (FILE *f, struct cgraph_node *node);
 591 void ipa_print_all_jump_functions (FILE * f);
 592 void ipcp_verify_propagated_values (void);
 593
 594 extern alloc_pool ipcp_cst_values_pool;
 595 extern alloc_pool ipcp_poly_ctx_values_pool;
 596 extern alloc_pool ipcp_sources_pool;
 597 extern alloc_pool ipcp_agg_lattice_pool;
 598
 599 /* Operation to be performed for the parameter in ipa_parm_adjustment
 600    below.  */
 601 enum ipa_parm_op {
 602   IPA_PARM_OP_NONE,
 603
 604   /* This describes a brand new parameter.
 605
 606      The field `type' should be set to the new type, `arg_prefix'
 607      should be set to the string prefix for the new DECL_NAME, and
 608      `new_decl' will ultimately hold the newly created argument.  */
 609   IPA_PARM_OP_NEW,
 610
 611   /* This new parameter is an unmodified parameter at index base_index. */
 612   IPA_PARM_OP_COPY,
 613
 614   /* This adjustment describes a parameter that is about to be removed
 615      completely.  Most users will probably need to book keep those so that they
 616      don't leave behinfd any non default def ssa names belonging to them.  */
 617   IPA_PARM_OP_REMOVE
 618 };
 619
 620 /* Structure to describe transformations of formal parameters and actual
 621    arguments.  Each instance describes one new parameter and they are meant to
 622    be stored in a vector.  Additionally, most users will probably want to store
 623    adjustments about parameters that are being removed altogether so that SSA
 624    names belonging to them can be replaced by SSA names of an artificial
 625    variable.  */
 626 struct ipa_parm_adjustment
 627 {
 628   /* The original PARM_DECL itself, helpful for processing of the body of the
 629      function itself.  Intended for traversing function bodies.
 630      ipa_modify_formal_parameters, ipa_modify_call_arguments and
 631      ipa_combine_adjustments ignore this and use base_index.
 632      ipa_modify_formal_parameters actually sets this.  */
 633   tree base;
 634
 635   /* Type of the new parameter.  However, if by_ref is true, the real type will
 636      be a pointer to this type.  */
 637   tree type;
 638
 639   /* Alias refrerence type to be used in MEM_REFs when adjusting caller
 640      arguments.  */
 641   tree alias_ptr_type;
 642
 643   /* The new declaration when creating/replacing a parameter.  Created
 644      by ipa_modify_formal_parameters, useful for functions modifying
 645      the body accordingly.  For brand new arguments, this is the newly
 646      created argument.  */
 647   tree new_decl;
 648
 649   /* New declaration of a substitute variable that we may use to replace all
 650      non-default-def ssa names when a parm decl is going away.  */
 651   tree new_ssa_base;
 652
 653   /* If non-NULL and the original parameter is to be removed (copy_param below
 654      is NULL), this is going to be its nonlocalized vars value.  */
 655   tree nonlocal_value;
 656
 657   /* This holds the prefix to be used for the new DECL_NAME.  */
 658   const char *arg_prefix;
 659
 660   /* Offset into the original parameter (for the cases when the new parameter
 661      is a component of an original one).  */
 662   HOST_WIDE_INT offset;
 663
 664   /* Zero based index of the original parameter this one is based on.  */
 665   int base_index;
 666
 667   /* Whether this parameter is a new parameter, a copy of an old one,
 668      or one about to be removed.  */
 669   enum ipa_parm_op op;
 670
 671   /* The parameter is to be passed by reference.  */
 672   unsigned by_ref : 1;
 673 };
 674
 675 typedef vec<ipa_parm_adjustment> ipa_parm_adjustment_vec;
 676
 677 vec<tree> ipa_get_vector_of_formal_parms (tree fndecl);
 678 vec<tree> ipa_get_vector_of_formal_parm_types (tree fntype);
 679 void ipa_modify_formal_parameters (tree fndecl, ipa_parm_adjustment_vec);
 680 void ipa_modify_call_arguments (struct cgraph_edge *, gcall *,
 681                                 ipa_parm_adjustment_vec);
 682 ipa_parm_adjustment_vec ipa_combine_adjustments (ipa_parm_adjustment_vec,
 683                                                  ipa_parm_adjustment_vec);
 684 void ipa_dump_param_adjustments (FILE *, ipa_parm_adjustment_vec, tree);
 685 void ipa_dump_agg_replacement_values (FILE *f,
 686                                       struct ipa_agg_replacement_value *av);
 687 void ipa_prop_write_jump_functions (void);
 688 void ipa_prop_read_jump_functions (void);
 689 void ipcp_write_transformation_summaries (void);
 690 void ipcp_read_transformation_summaries (void);
 691 void ipa_update_after_lto_read (void);
 692 int ipa_get_param_decl_index (struct ipa_node_params *, tree);
 693 tree ipa_value_from_jfunc (struct ipa_node_params *info,
 694                            struct ipa_jump_func *jfunc);
 695 unsigned int ipcp_transform_function (struct cgraph_node *node);
 696 ipa_polymorphic_call_context ipa_context_from_jfunc (ipa_node_params *,
 697                                                      cgraph_edge *,
 698                                                      int,
 699                                                      ipa_jump_func *);
 700 void ipa_dump_param (FILE *, struct ipa_node_params *info, int i);
 701 bool ipa_modify_expr (tree *, bool, ipa_parm_adjustment_vec);
 702 ipa_parm_adjustment *ipa_get_adjustment_candidate (tree **, bool *,
 703                                                    ipa_parm_adjustment_vec,
 704                                                    bool);
 705
 706
 707 /* From tree-sra.c:  */
 708 tree build_ref_for_offset (location_t, tree, HOST_WIDE_INT, tree,
 709                            gimple_stmt_iterator *, bool);
 710
 711 /* In ipa-cp.c  */
 712 void ipa_cp_c_finalize (void);
 713
 714 #endif /* IPA_PROP_H */