gcc/ipa-prop.h

   1 /* Interprocedural analyses.
   2    Copyright (C) 2005-2013 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 #include "tree.h"
  24 #include "vec.h"
  25 #include "cgraph.h"
  26 #include "gimple.h"
  27 #include "alloc-pool.h"
  28
  29 /* The following definitions and interfaces are used by
  30    interprocedural analyses or parameters.  */
  31
  32 #define IPA_UNDESCRIBED_USE -1
  33
  34 /* ipa-prop.c stuff (ipa-cp, indirect inlining):  */
  35
  36 /* A jump function for a callsite represents the values passed as actual
  37    arguments of the callsite.  They were originally proposed in a paper called
  38    "Interprocedural Constant Propagation", by David Callahan, Keith D Cooper,
  39    Ken Kennedy, Linda Torczon in Comp86, pg 152-161.  There are three main
  40    types of values :
  41
  42    Pass-through - the caller's formal parameter is passed as an actual
  43                   argument, possibly one simple operation performed on it.
  44    Constant     - a constant (is_gimple_ip_invariant)is passed as an actual
  45                   argument.
  46    Unknown      - neither of the above.
  47
  48    IPA_JF_ANCESTOR is a special pass-through jump function, which means that
  49    the result is an address of a part of the object pointed to by the formal
  50    parameter to which the function refers.  It is mainly intended to represent
  51    getting addresses of of ancestor fields in C++
  52    (e.g. &this_1(D)->D.1766.D.1756).  Note that if the original pointer is
  53    NULL, ancestor jump function must behave like a simple pass-through.
  54
  55    Other pass-through functions can either simply pass on an unchanged formal
  56    parameter or can apply one simple binary operation to it (such jump
  57    functions are called polynomial).
  58
  59    IPA_JF_KNOWN_TYPE is a special type of an "unknown" function that applies
  60    only to pointer parameters.  It means that even though we cannot prove that
  61    the passed value is an interprocedural constant, we still know the exact
  62    type of the containing object which may be valuable for devirtualization.
  63
  64    Jump functions are computed in ipa-prop.c by function
  65    update_call_notes_after_inlining.  Some information can be lost and jump
  66    functions degraded accordingly when inlining, see
  67    update_call_notes_after_inlining in the same file.  */
  68
  69 enum jump_func_type
  70 {
  71   IPA_JF_UNKNOWN = 0,  /* newly allocated and zeroed jump functions default */
  72   IPA_JF_KNOWN_TYPE,        /* represented by field known_type */
  73   IPA_JF_CONST,             /* represented by field costant */
  74   IPA_JF_PASS_THROUGH,      /* represented by field pass_through */
  75   IPA_JF_ANCESTOR           /* represented by field ancestor */
  76 };
  77
  78 /* Structure holding data required to describe a known type jump function.  */
  79 struct GTY(()) ipa_known_type_data
  80 {
  81   /* Offset of the component of the base_type being described.  */
  82   HOST_WIDE_INT offset;
  83   /* Type of the whole object.  */
  84   tree base_type;
  85   /* Type of the component of the object that is being described.  */
  86   tree component_type;
  87 };
  88
  89 struct ipa_cst_ref_desc;
  90
  91 /* Structure holding data required to describe a constant jump function.  */
  92 struct GTY(()) ipa_constant_data
  93 {
  94   /* THe value of the constant.  */
  95   tree value;
  96   /* Pointer to the structure that describes the reference.  */
  97   struct ipa_cst_ref_desc GTY((skip)) *rdesc;
  98 };
  99
 100 /* Structure holding data required to describe a pass-through jump function.  */
 101
 102 struct GTY(()) ipa_pass_through_data
 103 {
 104   /* If an operation is to be performed on the original parameter, this is the
 105      second (constant) operand.  */
 106   tree operand;
 107   /* Number of the caller's formal parameter being passed.  */
 108   int formal_id;
 109   /* Operation that is performed on the argument before it is passed on.
 110      NOP_EXPR means no operation.  Otherwise oper must be a simple binary
 111      arithmetic operation where the caller's parameter is the first operand and
 112      operand field from this structure is the second one.  */
 113   enum tree_code operation;
 114   /* When the passed value is a pointer, it is set to true only when we are
 115      certain that no write to the object it points to has occurred since the
 116      caller functions started execution, except for changes noted in the
 117      aggregate part of the jump function (see description of
 118      ipa_agg_jump_function).  The flag is used only when the operation is
 119      NOP_EXPR.  */
 120   unsigned agg_preserved : 1;
 121
 122   /* When set to true, we guarantee that, if there is a C++ object pointed to
 123      by this object, it does not undergo dynamic type change in the course of
 124      functions decribed by this jump function.  */
 125   unsigned type_preserved : 1;
 126 };
 127
 128 /* Structure holding data required to describe an ancestor pass-through
 129    jump function.  */
 130
 131 struct GTY(()) ipa_ancestor_jf_data
 132 {
 133   /* Offset of the field representing the ancestor.  */
 134   HOST_WIDE_INT offset;
 135   /* Type of the result.  */
 136   tree type;
 137   /* Number of the caller's formal parameter being passed.  */
 138   int formal_id;
 139   /* Flag with the same meaning like agg_preserve in ipa_pass_through_data.  */
 140   unsigned agg_preserved : 1;
 141   /* When set to true, we guarantee that, if there is a C++ object pointed to
 142      by this object, it does not undergo dynamic type change in the course of
 143      functions decribed by this jump function.  */
 144   unsigned type_preserved : 1;
 145 };
 146
 147 /* An element in an aggegate part of a jump function describing a known value
 148    at a given offset.  When it is part of a pass-through jump function with
 149    agg_preserved set or an ancestor jump function with agg_preserved set, all
 150    unlisted positions are assumed to be preserved but the value can be a type
 151    node, which means that the particular piece (starting at offset and having
 152    the size of the type) is clobbered with an unknown value.  When
 153    agg_preserved is false or the type of the containing jump function is
 154    different, all unlisted parts are assumed to be unknown and all values must
 155    fulfill is_gimple_ip_invariant.  */
 156
 157 typedef struct GTY(()) ipa_agg_jf_item
 158 {
 159   /* The offset at which the known value is located within the aggregate.  */
 160   HOST_WIDE_INT offset;
 161
 162   /* The known constant or type if this is a clobber.  */
 163   tree value;
 164 } ipa_agg_jf_item_t;
 165
 166
 167 /* Aggregate jump function - i.e. description of contents of aggregates passed
 168    either by reference or value.  */
 169
 170 struct GTY(()) ipa_agg_jump_function
 171 {
 172   /* Description of the individual items.  */
 173   vec<ipa_agg_jf_item_t, va_gc> *items;
 174   /* True if the data was passed by reference (as opposed to by value). */
 175   bool by_ref;
 176 };
 177
 178 typedef struct ipa_agg_jump_function *ipa_agg_jump_function_p;
 179 typedef struct ipa_agg_jump_function ipa_agg_jump_function_t;
 180
 181 /* A jump function for a callsite represents the values passed as actual
 182    arguments of the callsite. See enum jump_func_type for the various
 183    types of jump functions supported.  */
 184 typedef struct GTY (()) ipa_jump_func
 185 {
 186   /* Aggregate contants description.  See struct ipa_agg_jump_function and its
 187      description.  */
 188   struct ipa_agg_jump_function agg;
 189
 190   enum jump_func_type type;
 191   /* Represents a value of a jump function.  pass_through is used only in jump
 192      function context.  constant represents the actual constant in constant jump
 193      functions and member_cst holds constant c++ member functions.  */
 194   union jump_func_value
 195   {
 196     struct ipa_known_type_data GTY ((tag ("IPA_JF_KNOWN_TYPE"))) known_type;
 197     struct ipa_constant_data GTY ((tag ("IPA_JF_CONST"))) constant;
 198     struct ipa_pass_through_data GTY ((tag ("IPA_JF_PASS_THROUGH"))) pass_through;
 199     struct ipa_ancestor_jf_data GTY ((tag ("IPA_JF_ANCESTOR"))) ancestor;
 200   } GTY ((desc ("%1.type"))) value;
 201 } ipa_jump_func_t;
 202
 203
 204 /* Return the offset of the component that is described by a known type jump
 205    function JFUNC.  */
 206
 207 static inline HOST_WIDE_INT
 208 ipa_get_jf_known_type_offset (struct ipa_jump_func *jfunc)
 209 {
 210   gcc_checking_assert (jfunc->type == IPA_JF_KNOWN_TYPE);
 211   return jfunc->value.known_type.offset;
 212 }
 213
 214 /* Return the base type of a known type jump function JFUNC.  */
 215
 216 static inline tree
 217 ipa_get_jf_known_type_base_type (struct ipa_jump_func *jfunc)
 218 {
 219   gcc_checking_assert (jfunc->type == IPA_JF_KNOWN_TYPE);
 220   return jfunc->value.known_type.base_type;
 221 }
 222
 223 /* Return the component type of a known type jump function JFUNC.  */
 224
 225 static inline tree
 226 ipa_get_jf_known_type_component_type (struct ipa_jump_func *jfunc)
 227 {
 228   gcc_checking_assert (jfunc->type == IPA_JF_KNOWN_TYPE);
 229   return jfunc->value.known_type.component_type;
 230 }
 231
 232 /* Return the constant stored in a constant jump functin JFUNC.  */
 233
 234 static inline tree
 235 ipa_get_jf_constant (struct ipa_jump_func *jfunc)
 236 {
 237   gcc_checking_assert (jfunc->type == IPA_JF_CONST);
 238   return jfunc->value.constant.value;
 239 }
 240
 241 static inline struct ipa_cst_ref_desc *
 242 ipa_get_jf_constant_rdesc (struct ipa_jump_func *jfunc)
 243 {
 244   gcc_checking_assert (jfunc->type == IPA_JF_CONST);
 245   return jfunc->value.constant.rdesc;
 246 }
 247
 248 /* Return the operand of a pass through jmp function JFUNC.  */
 249
 250 static inline tree
 251 ipa_get_jf_pass_through_operand (struct ipa_jump_func *jfunc)
 252 {
 253   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 254   return jfunc->value.pass_through.operand;
 255 }
 256
 257 /* Return the number of the caller's formal parameter that a pass through jump
 258    function JFUNC refers to.  */
 259
 260 static inline int
 261 ipa_get_jf_pass_through_formal_id (struct ipa_jump_func *jfunc)
 262 {
 263   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 264   return jfunc->value.pass_through.formal_id;
 265 }
 266
 267 /* Return operation of a pass through jump function JFUNC.  */
 268
 269 static inline enum tree_code
 270 ipa_get_jf_pass_through_operation (struct ipa_jump_func *jfunc)
 271 {
 272   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 273   return jfunc->value.pass_through.operation;
 274 }
 275
 276 /* Return the agg_preserved flag of a pass through jump function JFUNC.  */
 277
 278 static inline bool
 279 ipa_get_jf_pass_through_agg_preserved (struct ipa_jump_func *jfunc)
 280 {
 281   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 282   return jfunc->value.pass_through.agg_preserved;
 283 }
 284
 285 /* Return the type_preserved flag of a pass through jump function JFUNC.  */
 286
 287 static inline bool
 288 ipa_get_jf_pass_through_type_preserved (struct ipa_jump_func *jfunc)
 289 {
 290   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 291   return jfunc->value.pass_through.type_preserved;
 292 }
 293
 294 /* Return the offset of an ancestor jump function JFUNC.  */
 295
 296 static inline HOST_WIDE_INT
 297 ipa_get_jf_ancestor_offset (struct ipa_jump_func *jfunc)
 298 {
 299   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 300   return jfunc->value.ancestor.offset;
 301 }
 302
 303 /* Return the result type of an ancestor jump function JFUNC.  */
 304
 305 static inline tree
 306 ipa_get_jf_ancestor_type (struct ipa_jump_func *jfunc)
 307 {
 308   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 309   return jfunc->value.ancestor.type;
 310 }
 311
 312 /* Return the number of the caller's formal parameter that an ancestor jump
 313    function JFUNC refers to.  */
 314
 315 static inline int
 316 ipa_get_jf_ancestor_formal_id (struct ipa_jump_func *jfunc)
 317 {
 318   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 319   return jfunc->value.ancestor.formal_id;
 320 }
 321
 322 /* Return the agg_preserved flag of an ancestor jump function JFUNC.  */
 323
 324 static inline bool
 325 ipa_get_jf_ancestor_agg_preserved (struct ipa_jump_func *jfunc)
 326 {
 327   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 328   return jfunc->value.ancestor.agg_preserved;
 329 }
 330
 331 /* Return the type_preserved flag of an ancestor jump function JFUNC.  */
 332
 333 static inline bool
 334 ipa_get_jf_ancestor_type_preserved (struct ipa_jump_func *jfunc)
 335 {
 336   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 337   return jfunc->value.ancestor.type_preserved;
 338 }
 339
 340 /* Summary describing a single formal parameter.  */
 341
 342 struct ipa_param_descriptor
 343 {
 344   /* PARAM_DECL of this parameter.  */
 345   tree decl;
 346   /* If all uses of the parameter are described by ipa-prop structures, this
 347      says how many there are.  If any use could not be described by means of
 348      ipa-prop structures, this is IPA_UNDESCRIBED_USE.  */
 349   int controlled_uses;
 350   unsigned int move_cost : 31;
 351   /* The parameter is used.  */
 352   unsigned used : 1;
 353 };
 354
 355 typedef struct ipa_param_descriptor ipa_param_descriptor_t;
 356 struct ipcp_lattice;
 357
 358 /* ipa_node_params stores information related to formal parameters of functions
 359    and some other information for interprocedural passes that operate on
 360    parameters (such as ipa-cp).  */
 361
 362 struct ipa_node_params
 363 {
 364   /* Information about individual formal parameters that are gathered when
 365      summaries are generated. */
 366   vec<ipa_param_descriptor_t> descriptors;
 367   /* Pointer to an array of structures describing individual formal
 368      parameters.  */
 369   struct ipcp_param_lattices *lattices;
 370   /* Only for versioned nodes this field would not be NULL,
 371      it points to the node that IPA cp cloned from.  */
 372   struct cgraph_node *ipcp_orig_node;
 373   /* If this node is an ipa-cp clone, these are the known values that describe
 374      what it has been specialized for.  */
 375   vec<tree> known_vals;
 376   /* Whether the param uses analysis has already been performed.  */
 377   unsigned uses_analysis_done : 1;
 378   /* Whether the function is enqueued in ipa-cp propagation stack.  */
 379   unsigned node_enqueued : 1;
 380   /* Whether we should create a specialized version based on values that are
 381      known to be constant in all contexts.  */
 382   unsigned do_clone_for_all_contexts : 1;
 383   /* Set if this is an IPA-CP clone for all contexts.  */
 384   unsigned is_all_contexts_clone : 1;
 385   /* Node has been completely replaced by clones and will be removed after
 386      ipa-cp is finished.  */
 387   unsigned node_dead : 1;
 388 };
 389
 390 /* ipa_node_params access functions.  Please use these to access fields that
 391    are or will be shared among various passes.  */
 392
 393 /* Return the number of formal parameters. */
 394
 395 static inline int
 396 ipa_get_param_count (struct ipa_node_params *info)
 397 {
 398   return info->descriptors.length ();
 399 }
 400
 401 /* Return the declaration of Ith formal parameter of the function corresponding
 402    to INFO.  Note there is no setter function as this array is built just once
 403    using ipa_initialize_node_params. */
 404
 405 static inline tree
 406 ipa_get_param (struct ipa_node_params *info, int i)
 407 {
 408   gcc_checking_assert (!flag_wpa);
 409   return info->descriptors[i].decl;
 410 }
 411
 412 /* Return the move cost of Ith formal parameter of the function corresponding
 413    to INFO.  */
 414
 415 static inline int
 416 ipa_get_param_move_cost (struct ipa_node_params *info, int i)
 417 {
 418   return info->descriptors[i].move_cost;
 419 }
 420
 421 /* Set the used flag corresponding to the Ith formal parameter of the function
 422    associated with INFO to VAL.  */
 423
 424 static inline void
 425 ipa_set_param_used (struct ipa_node_params *info, int i, bool val)
 426 {
 427   info->descriptors[i].used = val;
 428 }
 429
 430 /* Return how many uses described by ipa-prop a parameter has or
 431    IPA_UNDESCRIBED_USE if there is a use that is not described by these
 432    structures.  */
 433 static inline int
 434 ipa_get_controlled_uses (struct ipa_node_params *info, int i)
 435 {
 436   return info->descriptors[i].controlled_uses;
 437 }
 438
 439 /* Set the controlled counter of a given parameter.  */
 440
 441 static inline void
 442 ipa_set_controlled_uses (struct ipa_node_params *info, int i, int val)
 443 {
 444   info->descriptors[i].controlled_uses = val;
 445 }
 446
 447 /* Return the used flag corresponding to the Ith formal parameter of the
 448    function associated with INFO.  */
 449
 450 static inline bool
 451 ipa_is_param_used (struct ipa_node_params *info, int i)
 452 {
 453   return info->descriptors[i].used;
 454 }
 455
 456 /* Information about replacements done in aggregates for a given node (each
 457    node has its linked list).  */
 458 struct GTY(()) ipa_agg_replacement_value
 459 {
 460   /* Next item in the linked list.  */
 461   struct ipa_agg_replacement_value *next;
 462   /* Offset within the aggregate.  */
 463   HOST_WIDE_INT offset;
 464   /* The constant value.  */
 465   tree value;
 466   /* The paramter index.  */
 467   int index;
 468   /* Whether the value was passed by reference.  */
 469   bool by_ref;
 470 };
 471
 472 typedef struct ipa_agg_replacement_value *ipa_agg_replacement_value_p;
 473
 474 void ipa_set_node_agg_value_chain (struct cgraph_node *node,
 475                                    struct ipa_agg_replacement_value *aggvals);
 476
 477 /* ipa_edge_args stores information related to a callsite and particularly its
 478    arguments.  It can be accessed by the IPA_EDGE_REF macro.  */
 479 typedef struct GTY(()) ipa_edge_args
 480 {
 481   /* Vector of the callsite's jump function of each parameter.  */
 482   vec<ipa_jump_func_t, va_gc> *jump_functions;
 483 } ipa_edge_args_t;
 484
 485 /* ipa_edge_args access functions.  Please use these to access fields that
 486    are or will be shared among various passes.  */
 487
 488 /* Return the number of actual arguments. */
 489
 490 static inline int
 491 ipa_get_cs_argument_count (struct ipa_edge_args *args)
 492 {
 493   return vec_safe_length (args->jump_functions);
 494 }
 495
 496 /* Returns a pointer to the jump function for the ith argument.  Please note
 497    there is no setter function as jump functions are all set up in
 498    ipa_compute_jump_functions. */
 499
 500 static inline struct ipa_jump_func *
 501 ipa_get_ith_jump_func (struct ipa_edge_args *args, int i)
 502 {
 503   return &(*args->jump_functions)[i];
 504 }
 505
 506 /* Vectors need to have typedefs of structures.  */
 507 typedef struct ipa_node_params ipa_node_params_t;
 508
 509 /* Types of vectors holding the infos.  */
 510
 511 /* Vector where the parameter infos are actually stored. */
 512 extern vec<ipa_node_params_t> ipa_node_params_vector;
 513 /* Vector of known aggregate values in cloned nodes.  */
 514 extern GTY(()) vec<ipa_agg_replacement_value_p, va_gc> *ipa_node_agg_replacements;
 515 /* Vector where the parameter infos are actually stored. */
 516 extern GTY(()) vec<ipa_edge_args_t, va_gc> *ipa_edge_args_vector;
 517
 518 /* Return the associated parameter/argument info corresponding to the given
 519    node/edge.  */
 520 #define IPA_NODE_REF(NODE) (&ipa_node_params_vector[(NODE)->uid])
 521 #define IPA_EDGE_REF(EDGE) (&(*ipa_edge_args_vector)[(EDGE)->uid])
 522 /* This macro checks validity of index returned by
 523    ipa_get_param_decl_index function.  */
 524 #define IS_VALID_JUMP_FUNC_INDEX(I) ((I) != -1)
 525
 526 /* Creating and freeing ipa_node_params and ipa_edge_args.  */
 527 void ipa_create_all_node_params (void);
 528 void ipa_create_all_edge_args (void);
 529 void ipa_free_edge_args_substructures (struct ipa_edge_args *);
 530 void ipa_free_node_params_substructures (struct ipa_node_params *);
 531 void ipa_free_all_node_params (void);
 532 void ipa_free_all_edge_args (void);
 533 void ipa_free_all_structures_after_ipa_cp (void);
 534 void ipa_free_all_structures_after_iinln (void);
 535 void ipa_register_cgraph_hooks (void);
 536
 537 /* This function ensures the array of node param infos is big enough to
 538    accommodate a structure for all nodes and reallocates it if not.  */
 539
 540 static inline void
 541 ipa_check_create_node_params (void)
 542 {
 543   if (!ipa_node_params_vector.exists ())
 544     ipa_node_params_vector.create (cgraph_max_uid);
 545
 546   if (ipa_node_params_vector.length () <= (unsigned) cgraph_max_uid)
 547     ipa_node_params_vector.safe_grow_cleared (cgraph_max_uid + 1);
 548 }
 549
 550 /* This function ensures the array of edge arguments infos is big enough to
 551    accommodate a structure for all edges and reallocates it if not.  */
 552
 553 static inline void
 554 ipa_check_create_edge_args (void)
 555 {
 556   if (vec_safe_length (ipa_edge_args_vector) <= (unsigned) cgraph_edge_max_uid)
 557     vec_safe_grow_cleared (ipa_edge_args_vector, cgraph_edge_max_uid + 1);
 558 }
 559
 560 /* Returns true if the array of edge infos is large enough to accommodate an
 561    info for EDGE.  The main purpose of this function is that debug dumping
 562    function can check info availability without causing reallocations.  */
 563
 564 static inline bool
 565 ipa_edge_args_info_available_for_edge_p (struct cgraph_edge *edge)
 566 {
 567   return ((unsigned) edge->uid < vec_safe_length (ipa_edge_args_vector));
 568 }
 569
 570 /* Return the aggregate replacements for NODE, if there are any.  */
 571
 572 static inline struct ipa_agg_replacement_value *
 573 ipa_get_agg_replacements_for_node (struct cgraph_node *node)
 574 {
 575   if ((unsigned) node->uid >= vec_safe_length (ipa_node_agg_replacements))
 576     return NULL;
 577   return (*ipa_node_agg_replacements)[node->uid];
 578 }
 579
 580 /* Function formal parameters related computations.  */
 581 void ipa_initialize_node_params (struct cgraph_node *node);
 582 bool ipa_propagate_indirect_call_infos (struct cgraph_edge *cs,
 583                                         vec<cgraph_edge_p> *new_edges);
 584
 585 /* Indirect edge and binfo processing.  */
 586 tree ipa_get_indirect_edge_target (struct cgraph_edge *ie,
 587                                    vec<tree> ,
 588                                    vec<tree> ,
 589                                    vec<ipa_agg_jump_function_p> );
 590 struct cgraph_edge *ipa_make_edge_direct_to_target (struct cgraph_edge *, tree);
 591 tree ipa_binfo_from_known_type_jfunc (struct ipa_jump_func *);
 592 tree ipa_intraprocedural_devirtualization (gimple);
 593
 594 /* Functions related to both.  */
 595 void ipa_analyze_node (struct cgraph_node *);
 596
 597 /* Aggregate jump function related functions.  */
 598 tree ipa_find_agg_cst_for_param (struct ipa_agg_jump_function *, HOST_WIDE_INT,
 599                                  bool);
 600 bool ipa_load_from_parm_agg (struct ipa_node_params *, gimple, tree, int *,
 601                              HOST_WIDE_INT *, bool *);
 602
 603 /* Debugging interface.  */
 604 void ipa_print_node_params (FILE *, struct cgraph_node *node);
 605 void ipa_print_all_params (FILE *);
 606 void ipa_print_node_jump_functions (FILE *f, struct cgraph_node *node);
 607 void ipa_print_all_jump_functions (FILE * f);
 608 void ipcp_verify_propagated_values (void);
 609
 610 extern alloc_pool ipcp_values_pool;
 611 extern alloc_pool ipcp_sources_pool;
 612 extern alloc_pool ipcp_agg_lattice_pool;
 613
 614 /* Structure to describe transformations of formal parameters and actual
 615    arguments.  Each instance describes one new parameter and they are meant to
 616    be stored in a vector.  Additionally, most users will probably want to store
 617    adjustments about parameters that are being removed altogether so that SSA
 618    names belonging to them can be replaced by SSA names of an artificial
 619    variable.  */
 620 struct ipa_parm_adjustment
 621 {
 622   /* The original PARM_DECL itself, helpful for processing of the body of the
 623      function itself.  Intended for traversing function bodies.
 624      ipa_modify_formal_parameters, ipa_modify_call_arguments and
 625      ipa_combine_adjustments ignore this and use base_index.
 626      ipa_modify_formal_parameters actually sets this.  */
 627   tree base;
 628
 629   /* Type of the new parameter.  However, if by_ref is true, the real type will
 630      be a pointer to this type.  */
 631   tree type;
 632
 633   /* Alias refrerence type to be used in MEM_REFs when adjusting caller
 634      arguments.  */
 635   tree alias_ptr_type;
 636
 637   /* The new declaration when creating/replacing a parameter.  Created by
 638      ipa_modify_formal_parameters, useful for functions modifying the body
 639      accordingly. */
 640   tree reduction;
 641
 642   /* New declaration of a substitute variable that we may use to replace all
 643      non-default-def ssa names when a parm decl is going away.  */
 644   tree new_ssa_base;
 645
 646   /* If non-NULL and the original parameter is to be removed (copy_param below
 647      is NULL), this is going to be its nonlocalized vars value.  */
 648   tree nonlocal_value;
 649
 650   /* Offset into the original parameter (for the cases when the new parameter
 651      is a component of an original one).  */
 652   HOST_WIDE_INT offset;
 653
 654   /* Zero based index of the original parameter this one is based on.  (ATM
 655      there is no way to insert a new parameter out of the blue because there is
 656      no need but if it arises the code can be easily exteded to do so.)  */
 657   int base_index;
 658
 659   /* This new parameter is an unmodified parameter at index base_index. */
 660   unsigned copy_param : 1;
 661
 662   /* This adjustment describes a parameter that is about to be removed
 663      completely.  Most users will probably need to book keep those so that they
 664      don't leave behinfd any non default def ssa names belonging to them.  */
 665   unsigned remove_param : 1;
 666
 667   /* The parameter is to be passed by reference.  */
 668   unsigned by_ref : 1;
 669 };
 670
 671 typedef struct ipa_parm_adjustment ipa_parm_adjustment_t;
 672
 673 typedef vec<ipa_parm_adjustment_t> ipa_parm_adjustment_vec;
 674
 675 vec<tree> ipa_get_vector_of_formal_parms (tree fndecl);
 676 void ipa_modify_formal_parameters (tree fndecl, ipa_parm_adjustment_vec,
 677                                    const char *);
 678 void ipa_modify_call_arguments (struct cgraph_edge *, gimple,
 679                                 ipa_parm_adjustment_vec);
 680 ipa_parm_adjustment_vec ipa_combine_adjustments (ipa_parm_adjustment_vec,
 681                                                  ipa_parm_adjustment_vec);
 682 void ipa_dump_param_adjustments (FILE *, ipa_parm_adjustment_vec, tree);
 683 void ipa_dump_agg_replacement_values (FILE *f,
 684                                       struct ipa_agg_replacement_value *av);
 685 void ipa_prop_write_jump_functions (void);
 686 void ipa_prop_read_jump_functions (void);
 687 void ipa_prop_write_all_agg_replacement (void);
 688 void ipa_prop_read_all_agg_replacement (void);
 689 void ipa_update_after_lto_read (void);
 690 int ipa_get_param_decl_index (struct ipa_node_params *, tree);
 691 tree ipa_value_from_jfunc (struct ipa_node_params *info,
 692                            struct ipa_jump_func *jfunc);
 693 unsigned int ipcp_transform_function (struct cgraph_node *node);
 694 void ipa_dump_param (FILE *, struct ipa_node_params *info, int i);
 695
 696
 697 /* From tree-sra.c:  */
 698 tree build_ref_for_offset (location_t, tree, HOST_WIDE_INT, tree,
 699                            gimple_stmt_iterator *, bool);
 700
 701 #endif /* IPA_PROP_H */