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   /* Node is involved in a recursion, potentionally indirect.  */
 334   unsigned node_within_scc : 1;
 335   /* Node is calling a private function called only once.  */
 336   unsigned node_calling_single_call : 1;
 337 };
 338
 339 /* Intermediate information that we get from alias analysis about a particular
 340    parameter in a particular basic_block.  When a parameter or the memory it
 341    references is marked modified, we use that information in all dominated
 342    blocks without consulting alias analysis oracle.  */
 343
 344 struct ipa_param_aa_status
 345 {
 346   /* Set when this structure contains meaningful information.  If not, the
 347      structure describing a dominating BB should be used instead.  */
 348   bool valid;
 349
 350   /* Whether we have seen something which might have modified the data in
 351      question.  PARM is for the parameter itself, REF is for data it points to
 352      but using the alias type of individual accesses and PT is the same thing
 353      but for computing aggregate pass-through functions using a very inclusive
 354      ao_ref.  */
 355   bool parm_modified, ref_modified, pt_modified;
 356 };
 357
 358 /* Information related to a given BB that used only when looking at function
 359    body.  */
 360
 361 struct ipa_bb_info
 362 {
 363   /* Call graph edges going out of this BB.  */
 364   vec<cgraph_edge *> cg_edges;
 365   /* Alias analysis statuses of each formal parameter at this bb.  */
 366   vec<ipa_param_aa_status> param_aa_statuses;
 367 };
 368
 369 /* Structure with global information that is only used when looking at function
 370    body. */
 371
 372 struct ipa_func_body_info
 373 {
 374   /* The node that is being analyzed.  */
 375   cgraph_node *node;
 376
 377   /* Its info.  */
 378   struct ipa_node_params *info;
 379
 380   /* Information about individual BBs. */
 381   vec<ipa_bb_info> bb_infos;
 382
 383   /* Number of parameters.  */
 384   int param_count;
 385
 386   /* Number of statements already walked by when analyzing this function.  */
 387   unsigned int aa_walked;
 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   /* FIXME: introducing speuclation causes out of bounds access here.  */
 437   if (info->descriptors.length () > (unsigned)i)
 438     return info->descriptors[i].controlled_uses;
 439   return IPA_UNDESCRIBED_USE;
 440 }
 441
 442 /* Set the controlled counter of a given parameter.  */
 443
 444 static inline void
 445 ipa_set_controlled_uses (struct ipa_node_params *info, int i, int val)
 446 {
 447   info->descriptors[i].controlled_uses = val;
 448 }
 449
 450 /* Return the used flag corresponding to the Ith formal parameter of the
 451    function associated with INFO.  */
 452
 453 static inline bool
 454 ipa_is_param_used (struct ipa_node_params *info, int i)
 455 {
 456   return info->descriptors[i].used;
 457 }
 458
 459 /* Information about replacements done in aggregates for a given node (each
 460    node has its linked list).  */
 461 struct GTY(()) ipa_agg_replacement_value
 462 {
 463   /* Next item in the linked list.  */
 464   struct ipa_agg_replacement_value *next;
 465   /* Offset within the aggregate.  */
 466   HOST_WIDE_INT offset;
 467   /* The constant value.  */
 468   tree value;
 469   /* The paramter index.  */
 470   int index;
 471   /* Whether the value was passed by reference.  */
 472   bool by_ref;
 473 };
 474
 475 /* Structure holding information for the transformation phase of IPA-CP.  */
 476
 477 struct GTY(()) ipcp_transformation_summary
 478 {
 479   /* Linked list of known aggregate values.  */
 480   ipa_agg_replacement_value *agg_values;
 481   /* Alignment information for pointers.  */
 482   vec<ipa_alignment, va_gc> *alignments;
 483 };
 484
 485 void ipa_set_node_agg_value_chain (struct cgraph_node *node,
 486                                    struct ipa_agg_replacement_value *aggvals);
 487 void ipcp_grow_transformations_if_necessary (void);
 488
 489 /* ipa_edge_args stores information related to a callsite and particularly its
 490    arguments.  It can be accessed by the IPA_EDGE_REF macro.  */
 491 struct GTY(()) ipa_edge_args
 492 {
 493   /* Vector of the callsite's jump function of each parameter.  */
 494   vec<ipa_jump_func, va_gc> *jump_functions;
 495   vec<ipa_polymorphic_call_context, va_gc> *polymorphic_call_contexts;
 496 };
 497
 498 /* ipa_edge_args access functions.  Please use these to access fields that
 499    are or will be shared among various passes.  */
 500
 501 /* Return the number of actual arguments. */
 502
 503 static inline int
 504 ipa_get_cs_argument_count (struct ipa_edge_args *args)
 505 {
 506   return vec_safe_length (args->jump_functions);
 507 }
 508
 509 /* Returns a pointer to the jump function for the ith argument.  Please note
 510    there is no setter function as jump functions are all set up in
 511    ipa_compute_jump_functions. */
 512
 513 static inline struct ipa_jump_func *
 514 ipa_get_ith_jump_func (struct ipa_edge_args *args, int i)
 515 {
 516   return &(*args->jump_functions)[i];
 517 }
 518
 519 /* Returns a pointer to the polymorphic call context for the ith argument.
 520    NULL if contexts are not computed.  */
 521 static inline struct ipa_polymorphic_call_context *
 522 ipa_get_ith_polymorhic_call_context (struct ipa_edge_args *args, int i)
 523 {
 524   if (!args->polymorphic_call_contexts)
 525     return NULL;
 526   return &(*args->polymorphic_call_contexts)[i];
 527 }
 528
 529 /* Function summary for ipa_node_params.  */
 530 class ipa_node_params_t: public function_summary <ipa_node_params *>
 531 {
 532 public:
 533   ipa_node_params_t (symbol_table *table):
 534     function_summary<ipa_node_params *> (table) { }
 535
 536   /* Hook that is called by summary when a node is duplicated.  */
 537   virtual void duplicate (cgraph_node *node,
 538                           cgraph_node *node2,
 539                           ipa_node_params *data,
 540                           ipa_node_params *data2);
 541 };
 542
 543 /* Function summary where the parameter infos are actually stored. */
 544 extern ipa_node_params_t *ipa_node_params_sum;
 545 /* Vector of IPA-CP transformation data for each clone.  */
 546 extern GTY(()) vec<ipcp_transformation_summary, va_gc> *ipcp_transformations;
 547 /* Vector where the parameter infos are actually stored. */
 548 extern GTY(()) vec<ipa_edge_args, va_gc> *ipa_edge_args_vector;
 549
 550 /* Return the associated parameter/argument info corresponding to the given
 551    node/edge.  */
 552 #define IPA_NODE_REF(NODE) (ipa_node_params_sum->get (NODE))
 553 #define IPA_EDGE_REF(EDGE) (&(*ipa_edge_args_vector)[(EDGE)->uid])
 554 /* This macro checks validity of index returned by
 555    ipa_get_param_decl_index function.  */
 556 #define IS_VALID_JUMP_FUNC_INDEX(I) ((I) != -1)
 557
 558 /* Creating and freeing ipa_node_params and ipa_edge_args.  */
 559 void ipa_create_all_node_params (void);
 560 void ipa_create_all_edge_args (void);
 561 void ipa_free_edge_args_substructures (struct ipa_edge_args *);
 562 void ipa_free_all_node_params (void);
 563 void ipa_free_all_edge_args (void);
 564 void ipa_free_all_structures_after_ipa_cp (void);
 565 void ipa_free_all_structures_after_iinln (void);
 566
 567 void ipa_register_cgraph_hooks (void);
 568 int count_formal_params (tree fndecl);
 569
 570 /* This function ensures the array of node param infos is big enough to
 571    accommodate a structure for all nodes and reallocates it if not.  */
 572
 573 static inline void
 574 ipa_check_create_node_params (void)
 575 {
 576   if (!ipa_node_params_sum)
 577     ipa_node_params_sum = new ipa_node_params_t (symtab);
 578 }
 579
 580 /* This function ensures the array of edge arguments infos is big enough to
 581    accommodate a structure for all edges and reallocates it if not.  */
 582
 583 static inline void
 584 ipa_check_create_edge_args (void)
 585 {
 586   if (vec_safe_length (ipa_edge_args_vector)
 587       <= (unsigned) symtab->edges_max_uid)
 588     vec_safe_grow_cleared (ipa_edge_args_vector, symtab->edges_max_uid + 1);
 589 }
 590
 591 /* Returns true if the array of edge infos is large enough to accommodate an
 592    info for EDGE.  The main purpose of this function is that debug dumping
 593    function can check info availability without causing reallocations.  */
 594
 595 static inline bool
 596 ipa_edge_args_info_available_for_edge_p (struct cgraph_edge *edge)
 597 {
 598   return ((unsigned) edge->uid < vec_safe_length (ipa_edge_args_vector));
 599 }
 600
 601 static inline ipcp_transformation_summary *
 602 ipcp_get_transformation_summary (cgraph_node *node)
 603 {
 604   if ((unsigned) node->uid >= vec_safe_length (ipcp_transformations))
 605     return NULL;
 606   return &(*ipcp_transformations)[node->uid];
 607 }
 608
 609 /* Return the aggregate replacements for NODE, if there are any.  */
 610
 611 static inline struct ipa_agg_replacement_value *
 612 ipa_get_agg_replacements_for_node (cgraph_node *node)
 613 {
 614   ipcp_transformation_summary *ts = ipcp_get_transformation_summary (node);
 615   return ts ? ts->agg_values : NULL;
 616 }
 617
 618 /* Function formal parameters related computations.  */
 619 void ipa_initialize_node_params (struct cgraph_node *node);
 620 bool ipa_propagate_indirect_call_infos (struct cgraph_edge *cs,
 621                                         vec<cgraph_edge *> *new_edges);
 622
 623 /* Indirect edge and binfo processing.  */
 624 tree ipa_get_indirect_edge_target (struct cgraph_edge *ie,
 625                                    vec<tree> ,
 626                                    vec<ipa_polymorphic_call_context>,
 627                                    vec<ipa_agg_jump_function_p>,
 628                                    bool *);
 629 struct cgraph_edge *ipa_make_edge_direct_to_target (struct cgraph_edge *, tree,
 630                                                     bool speculative = false);
 631 tree ipa_impossible_devirt_target (struct cgraph_edge *, tree);
 632
 633 /* Functions related to both.  */
 634 void ipa_analyze_node (struct cgraph_node *);
 635
 636 /* Aggregate jump function related functions.  */
 637 tree ipa_find_agg_cst_for_param (struct ipa_agg_jump_function *, HOST_WIDE_INT,
 638                                  bool);
 639 bool ipa_load_from_parm_agg (struct ipa_func_body_info *,
 640                              vec<ipa_param_descriptor>, gimple, tree, int *,
 641                              HOST_WIDE_INT *, HOST_WIDE_INT *, bool *);
 642
 643 /* Debugging interface.  */
 644 void ipa_print_node_params (FILE *, struct cgraph_node *node);
 645 void ipa_print_all_params (FILE *);
 646 void ipa_print_node_jump_functions (FILE *f, struct cgraph_node *node);
 647 void ipa_print_all_jump_functions (FILE * f);
 648 void ipcp_verify_propagated_values (void);
 649
 650 extern alloc_pool ipcp_cst_values_pool;
 651 extern alloc_pool ipcp_poly_ctx_values_pool;
 652 extern alloc_pool ipcp_sources_pool;
 653 extern alloc_pool ipcp_agg_lattice_pool;
 654
 655 /* Operation to be performed for the parameter in ipa_parm_adjustment
 656    below.  */
 657 enum ipa_parm_op {
 658   IPA_PARM_OP_NONE,
 659
 660   /* This describes a brand new parameter.
 661
 662      The field `type' should be set to the new type, `arg_prefix'
 663      should be set to the string prefix for the new DECL_NAME, and
 664      `new_decl' will ultimately hold the newly created argument.  */
 665   IPA_PARM_OP_NEW,
 666
 667   /* This new parameter is an unmodified parameter at index base_index. */
 668   IPA_PARM_OP_COPY,
 669
 670   /* This adjustment describes a parameter that is about to be removed
 671      completely.  Most users will probably need to book keep those so that they
 672      don't leave behinfd any non default def ssa names belonging to them.  */
 673   IPA_PARM_OP_REMOVE
 674 };
 675
 676 /* Structure to describe transformations of formal parameters and actual
 677    arguments.  Each instance describes one new parameter and they are meant to
 678    be stored in a vector.  Additionally, most users will probably want to store
 679    adjustments about parameters that are being removed altogether so that SSA
 680    names belonging to them can be replaced by SSA names of an artificial
 681    variable.  */
 682 struct ipa_parm_adjustment
 683 {
 684   /* The original PARM_DECL itself, helpful for processing of the body of the
 685      function itself.  Intended for traversing function bodies.
 686      ipa_modify_formal_parameters, ipa_modify_call_arguments and
 687      ipa_combine_adjustments ignore this and use base_index.
 688      ipa_modify_formal_parameters actually sets this.  */
 689   tree base;
 690
 691   /* Type of the new parameter.  However, if by_ref is true, the real type will
 692      be a pointer to this type.  */
 693   tree type;
 694
 695   /* Alias refrerence type to be used in MEM_REFs when adjusting caller
 696      arguments.  */
 697   tree alias_ptr_type;
 698
 699   /* The new declaration when creating/replacing a parameter.  Created
 700      by ipa_modify_formal_parameters, useful for functions modifying
 701      the body accordingly.  For brand new arguments, this is the newly
 702      created argument.  */
 703   tree new_decl;
 704
 705   /* New declaration of a substitute variable that we may use to replace all
 706      non-default-def ssa names when a parm decl is going away.  */
 707   tree new_ssa_base;
 708
 709   /* If non-NULL and the original parameter is to be removed (copy_param below
 710      is NULL), this is going to be its nonlocalized vars value.  */
 711   tree nonlocal_value;
 712
 713   /* This holds the prefix to be used for the new DECL_NAME.  */
 714   const char *arg_prefix;
 715
 716   /* Offset into the original parameter (for the cases when the new parameter
 717      is a component of an original one).  */
 718   HOST_WIDE_INT offset;
 719
 720   /* Zero based index of the original parameter this one is based on.  */
 721   int base_index;
 722
 723   /* Whether this parameter is a new parameter, a copy of an old one,
 724      or one about to be removed.  */
 725   enum ipa_parm_op op;
 726
 727   /* The parameter is to be passed by reference.  */
 728   unsigned by_ref : 1;
 729 };
 730
 731 typedef vec<ipa_parm_adjustment> ipa_parm_adjustment_vec;
 732
 733 vec<tree> ipa_get_vector_of_formal_parms (tree fndecl);
 734 vec<tree> ipa_get_vector_of_formal_parm_types (tree fntype);
 735 void ipa_modify_formal_parameters (tree fndecl, ipa_parm_adjustment_vec);
 736 void ipa_modify_call_arguments (struct cgraph_edge *, gcall *,
 737                                 ipa_parm_adjustment_vec);
 738 ipa_parm_adjustment_vec ipa_combine_adjustments (ipa_parm_adjustment_vec,
 739                                                  ipa_parm_adjustment_vec);
 740 void ipa_dump_param_adjustments (FILE *, ipa_parm_adjustment_vec, tree);
 741 void ipa_dump_agg_replacement_values (FILE *f,
 742                                       struct ipa_agg_replacement_value *av);
 743 void ipa_prop_write_jump_functions (void);
 744 void ipa_prop_read_jump_functions (void);
 745 void ipcp_write_transformation_summaries (void);
 746 void ipcp_read_transformation_summaries (void);
 747 void ipa_update_after_lto_read (void);
 748 int ipa_get_param_decl_index (struct ipa_node_params *, tree);
 749 tree ipa_value_from_jfunc (struct ipa_node_params *info,
 750                            struct ipa_jump_func *jfunc);
 751 unsigned int ipcp_transform_function (struct cgraph_node *node);
 752 ipa_polymorphic_call_context ipa_context_from_jfunc (ipa_node_params *,
 753                                                      cgraph_edge *,
 754                                                      int,
 755                                                      ipa_jump_func *);
 756 void ipa_dump_param (FILE *, struct ipa_node_params *info, int i);
 757 bool ipa_modify_expr (tree *, bool, ipa_parm_adjustment_vec);
 758 ipa_parm_adjustment *ipa_get_adjustment_candidate (tree **, bool *,
 759                                                    ipa_parm_adjustment_vec,
 760                                                    bool);
 761
 762
 763 /* From tree-sra.c:  */
 764 tree build_ref_for_offset (location_t, tree, HOST_WIDE_INT, tree,
 765                            gimple_stmt_iterator *, bool);
 766
 767 /* In ipa-cp.c  */
 768 void ipa_cp_c_finalize (void);
 769
 770 #endif /* IPA_PROP_H */