gcc/ipa-prop.h

   1 /* Interprocedural analyses.
   2    Copyright (C) 2005-2016 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 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 /* Information about zero/non-zero bits.  */
 147 struct GTY(()) ipa_bits
 148 {
 149   /* The propagated value.  */
 150   widest_int value;
 151   /* Mask corresponding to the value.
 152      Similar to ccp_lattice_t, if xth bit of mask is 0,
 153      implies xth bit of value is constant.  */
 154   widest_int mask;
 155   /* True if jump function is known.  */
 156   bool known;
 157 };
 158
 159 /* Info about value ranges.  */
 160 struct GTY(()) ipa_vr
 161 {
 162   /* The data fields below are valid only if known is true.  */
 163   bool known;
 164   enum value_range_type type;
 165   wide_int min;
 166   wide_int max;
 167 };
 168
 169 /* A jump function for a callsite represents the values passed as actual
 170    arguments of the callsite. See enum jump_func_type for the various
 171    types of jump functions supported.  */
 172 struct GTY (()) ipa_jump_func
 173 {
 174   /* Aggregate contants description.  See struct ipa_agg_jump_function and its
 175      description.  */
 176   struct ipa_agg_jump_function agg;
 177
 178   /* Information about zero/non-zero bits.  */
 179   struct ipa_bits bits;
 180
 181   /* Information about value range.  */
 182   bool vr_known;
 183   value_range m_vr;
 184
 185   enum jump_func_type type;
 186   /* Represents a value of a jump function.  pass_through is used only in jump
 187      function context.  constant represents the actual constant in constant jump
 188      functions and member_cst holds constant c++ member functions.  */
 189   union jump_func_value
 190   {
 191     struct ipa_constant_data GTY ((tag ("IPA_JF_CONST"))) constant;
 192     struct ipa_pass_through_data GTY ((tag ("IPA_JF_PASS_THROUGH"))) pass_through;
 193     struct ipa_ancestor_jf_data GTY ((tag ("IPA_JF_ANCESTOR"))) ancestor;
 194   } GTY ((desc ("%1.type"))) value;
 195 };
 196
 197
 198 /* Return the constant stored in a constant jump functin JFUNC.  */
 199
 200 static inline tree
 201 ipa_get_jf_constant (struct ipa_jump_func *jfunc)
 202 {
 203   gcc_checking_assert (jfunc->type == IPA_JF_CONST);
 204   return jfunc->value.constant.value;
 205 }
 206
 207 static inline struct ipa_cst_ref_desc *
 208 ipa_get_jf_constant_rdesc (struct ipa_jump_func *jfunc)
 209 {
 210   gcc_checking_assert (jfunc->type == IPA_JF_CONST);
 211   return jfunc->value.constant.rdesc;
 212 }
 213
 214 /* Return the operand of a pass through jmp function JFUNC.  */
 215
 216 static inline tree
 217 ipa_get_jf_pass_through_operand (struct ipa_jump_func *jfunc)
 218 {
 219   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 220   return jfunc->value.pass_through.operand;
 221 }
 222
 223 /* Return the number of the caller's formal parameter that a pass through jump
 224    function JFUNC refers to.  */
 225
 226 static inline int
 227 ipa_get_jf_pass_through_formal_id (struct ipa_jump_func *jfunc)
 228 {
 229   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 230   return jfunc->value.pass_through.formal_id;
 231 }
 232
 233 /* Return operation of a pass through jump function JFUNC.  */
 234
 235 static inline enum tree_code
 236 ipa_get_jf_pass_through_operation (struct ipa_jump_func *jfunc)
 237 {
 238   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 239   return jfunc->value.pass_through.operation;
 240 }
 241
 242 /* Return the agg_preserved flag of a pass through jump function JFUNC.  */
 243
 244 static inline bool
 245 ipa_get_jf_pass_through_agg_preserved (struct ipa_jump_func *jfunc)
 246 {
 247   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 248   return jfunc->value.pass_through.agg_preserved;
 249 }
 250
 251 /* Return true if pass through jump function JFUNC preserves type
 252    information.  */
 253
 254 static inline bool
 255 ipa_get_jf_pass_through_type_preserved (struct ipa_jump_func *jfunc)
 256 {
 257   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 258   return jfunc->value.pass_through.agg_preserved;
 259 }
 260
 261 /* Return the offset of an ancestor jump function JFUNC.  */
 262
 263 static inline HOST_WIDE_INT
 264 ipa_get_jf_ancestor_offset (struct ipa_jump_func *jfunc)
 265 {
 266   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 267   return jfunc->value.ancestor.offset;
 268 }
 269
 270 /* Return the number of the caller's formal parameter that an ancestor jump
 271    function JFUNC refers to.  */
 272
 273 static inline int
 274 ipa_get_jf_ancestor_formal_id (struct ipa_jump_func *jfunc)
 275 {
 276   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 277   return jfunc->value.ancestor.formal_id;
 278 }
 279
 280 /* Return the agg_preserved flag of an ancestor jump function JFUNC.  */
 281
 282 static inline bool
 283 ipa_get_jf_ancestor_agg_preserved (struct ipa_jump_func *jfunc)
 284 {
 285   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 286   return jfunc->value.ancestor.agg_preserved;
 287 }
 288
 289 /* Return true if ancestor jump function JFUNC presrves type information.  */
 290
 291 static inline bool
 292 ipa_get_jf_ancestor_type_preserved (struct ipa_jump_func *jfunc)
 293 {
 294   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 295   return jfunc->value.ancestor.agg_preserved;
 296 }
 297
 298 /* Summary describing a single formal parameter.  */
 299
 300 struct ipa_param_descriptor
 301 {
 302   /* In analysis and modification phase, this is the PARAM_DECL of this
 303      parameter, in IPA LTO phase, this is the type of the the described
 304      parameter or NULL if not known.  Do not read this field directly but
 305      through ipa_get_param and ipa_get_type as appropriate.  */
 306   tree decl_or_type;
 307   /* If all uses of the parameter are described by ipa-prop structures, this
 308      says how many there are.  If any use could not be described by means of
 309      ipa-prop structures, this is IPA_UNDESCRIBED_USE.  */
 310   int controlled_uses;
 311   unsigned int move_cost : 31;
 312   /* The parameter is used.  */
 313   unsigned used : 1;
 314 };
 315
 316 /* ipa_node_params stores information related to formal parameters of functions
 317    and some other information for interprocedural passes that operate on
 318    parameters (such as ipa-cp).  */
 319
 320 struct ipa_node_params
 321 {
 322   ~ipa_node_params ();
 323
 324   /* Information about individual formal parameters that are gathered when
 325      summaries are generated. */
 326   vec<ipa_param_descriptor> descriptors;
 327   /* Pointer to an array of structures describing individual formal
 328      parameters.  */
 329   struct ipcp_param_lattices *lattices;
 330   /* Only for versioned nodes this field would not be NULL,
 331      it points to the node that IPA cp cloned from.  */
 332   struct cgraph_node *ipcp_orig_node;
 333   /* If this node is an ipa-cp clone, these are the known constants that
 334      describe what it has been specialized for.  */
 335   vec<tree> known_csts;
 336   /* If this node is an ipa-cp clone, these are the known polymorphic contexts
 337      that describe what it has been specialized for.  */
 338   vec<ipa_polymorphic_call_context> known_contexts;
 339   /* Whether the param uses analysis and jump function computation has already
 340      been performed.  */
 341   unsigned analysis_done : 1;
 342   /* Whether the function is enqueued in ipa-cp propagation stack.  */
 343   unsigned node_enqueued : 1;
 344   /* Whether we should create a specialized version based on values that are
 345      known to be constant in all contexts.  */
 346   unsigned do_clone_for_all_contexts : 1;
 347   /* Set if this is an IPA-CP clone for all contexts.  */
 348   unsigned is_all_contexts_clone : 1;
 349   /* Node has been completely replaced by clones and will be removed after
 350      ipa-cp is finished.  */
 351   unsigned node_dead : 1;
 352   /* Node is involved in a recursion, potentionally indirect.  */
 353   unsigned node_within_scc : 1;
 354   /* Node is calling a private function called only once.  */
 355   unsigned node_calling_single_call : 1;
 356   /* False when there is something makes versioning impossible.  */
 357   unsigned versionable : 1;
 358 };
 359
 360 /* Intermediate information that we get from alias analysis about a particular
 361    parameter in a particular basic_block.  When a parameter or the memory it
 362    references is marked modified, we use that information in all dominated
 363    blocks without consulting alias analysis oracle.  */
 364
 365 struct ipa_param_aa_status
 366 {
 367   /* Set when this structure contains meaningful information.  If not, the
 368      structure describing a dominating BB should be used instead.  */
 369   bool valid;
 370
 371   /* Whether we have seen something which might have modified the data in
 372      question.  PARM is for the parameter itself, REF is for data it points to
 373      but using the alias type of individual accesses and PT is the same thing
 374      but for computing aggregate pass-through functions using a very inclusive
 375      ao_ref.  */
 376   bool parm_modified, ref_modified, pt_modified;
 377 };
 378
 379 /* Information related to a given BB that used only when looking at function
 380    body.  */
 381
 382 struct ipa_bb_info
 383 {
 384   /* Call graph edges going out of this BB.  */
 385   vec<cgraph_edge *> cg_edges;
 386   /* Alias analysis statuses of each formal parameter at this bb.  */
 387   vec<ipa_param_aa_status> param_aa_statuses;
 388 };
 389
 390 /* Structure with global information that is only used when looking at function
 391    body. */
 392
 393 struct ipa_func_body_info
 394 {
 395   /* The node that is being analyzed.  */
 396   cgraph_node *node;
 397
 398   /* Its info.  */
 399   struct ipa_node_params *info;
 400
 401   /* Information about individual BBs. */
 402   vec<ipa_bb_info> bb_infos;
 403
 404   /* Number of parameters.  */
 405   int param_count;
 406
 407   /* Number of statements already walked by when analyzing this function.  */
 408   unsigned int aa_walked;
 409 };
 410
 411 /* ipa_node_params access functions.  Please use these to access fields that
 412    are or will be shared among various passes.  */
 413
 414 /* Return the number of formal parameters. */
 415
 416 static inline int
 417 ipa_get_param_count (struct ipa_node_params *info)
 418 {
 419   return info->descriptors.length ();
 420 }
 421
 422 /* Return the declaration of Ith formal parameter of the function corresponding
 423    to INFO.  Note there is no setter function as this array is built just once
 424    using ipa_initialize_node_params.  This function should not be called in
 425    WPA.  */
 426
 427 static inline tree
 428 ipa_get_param (struct ipa_node_params *info, int i)
 429 {
 430   gcc_checking_assert (!flag_wpa);
 431   tree t = info->descriptors[i].decl_or_type;
 432   gcc_checking_assert (TREE_CODE (t) == PARM_DECL);
 433   return t;
 434 }
 435
 436 /* Return the type of Ith formal parameter of the function corresponding
 437    to INFO if it is known or NULL if not.  */
 438
 439 static inline tree
 440 ipa_get_type (struct ipa_node_params *info, int i)
 441 {
 442   tree t = info->descriptors[i].decl_or_type;
 443   if (!t)
 444     return NULL;
 445   if (TYPE_P (t))
 446     return t;
 447   gcc_checking_assert (TREE_CODE (t) == PARM_DECL);
 448   return TREE_TYPE (t);
 449 }
 450
 451 /* Return the move cost of Ith formal parameter of the function corresponding
 452    to INFO.  */
 453
 454 static inline int
 455 ipa_get_param_move_cost (struct ipa_node_params *info, int i)
 456 {
 457   return info->descriptors[i].move_cost;
 458 }
 459
 460 /* Set the used flag corresponding to the Ith formal parameter of the function
 461    associated with INFO to VAL.  */
 462
 463 static inline void
 464 ipa_set_param_used (struct ipa_node_params *info, int i, bool val)
 465 {
 466   info->descriptors[i].used = val;
 467 }
 468
 469 /* Return how many uses described by ipa-prop a parameter has or
 470    IPA_UNDESCRIBED_USE if there is a use that is not described by these
 471    structures.  */
 472 static inline int
 473 ipa_get_controlled_uses (struct ipa_node_params *info, int i)
 474 {
 475   /* FIXME: introducing speuclation causes out of bounds access here.  */
 476   if (info->descriptors.length () > (unsigned)i)
 477     return info->descriptors[i].controlled_uses;
 478   return IPA_UNDESCRIBED_USE;
 479 }
 480
 481 /* Set the controlled counter of a given parameter.  */
 482
 483 static inline void
 484 ipa_set_controlled_uses (struct ipa_node_params *info, int i, int val)
 485 {
 486   info->descriptors[i].controlled_uses = val;
 487 }
 488
 489 /* Return the used flag corresponding to the Ith formal parameter of the
 490    function associated with INFO.  */
 491
 492 static inline bool
 493 ipa_is_param_used (struct ipa_node_params *info, int i)
 494 {
 495   return info->descriptors[i].used;
 496 }
 497
 498 /* Information about replacements done in aggregates for a given node (each
 499    node has its linked list).  */
 500 struct GTY(()) ipa_agg_replacement_value
 501 {
 502   /* Next item in the linked list.  */
 503   struct ipa_agg_replacement_value *next;
 504   /* Offset within the aggregate.  */
 505   HOST_WIDE_INT offset;
 506   /* The constant value.  */
 507   tree value;
 508   /* The paramter index.  */
 509   int index;
 510   /* Whether the value was passed by reference.  */
 511   bool by_ref;
 512 };
 513
 514 /* Structure holding information for the transformation phase of IPA-CP.  */
 515
 516 struct GTY(()) ipcp_transformation_summary
 517 {
 518   /* Linked list of known aggregate values.  */
 519   ipa_agg_replacement_value *agg_values;
 520   /* Known bits information.  */
 521   vec<ipa_bits, va_gc> *bits;
 522   /* Value range information.  */
 523   vec<ipa_vr, va_gc> *m_vr;
 524 };
 525
 526 void ipa_set_node_agg_value_chain (struct cgraph_node *node,
 527                                    struct ipa_agg_replacement_value *aggvals);
 528 void ipcp_grow_transformations_if_necessary (void);
 529
 530 /* ipa_edge_args stores information related to a callsite and particularly its
 531    arguments.  It can be accessed by the IPA_EDGE_REF macro.  */
 532 struct GTY(()) ipa_edge_args
 533 {
 534   /* Vector of the callsite's jump function of each parameter.  */
 535   vec<ipa_jump_func, va_gc> *jump_functions;
 536   vec<ipa_polymorphic_call_context, va_gc> *polymorphic_call_contexts;
 537 };
 538
 539 /* ipa_edge_args access functions.  Please use these to access fields that
 540    are or will be shared among various passes.  */
 541
 542 /* Return the number of actual arguments. */
 543
 544 static inline int
 545 ipa_get_cs_argument_count (struct ipa_edge_args *args)
 546 {
 547   return vec_safe_length (args->jump_functions);
 548 }
 549
 550 /* Returns a pointer to the jump function for the ith argument.  Please note
 551    there is no setter function as jump functions are all set up in
 552    ipa_compute_jump_functions. */
 553
 554 static inline struct ipa_jump_func *
 555 ipa_get_ith_jump_func (struct ipa_edge_args *args, int i)
 556 {
 557   return &(*args->jump_functions)[i];
 558 }
 559
 560 /* Returns a pointer to the polymorphic call context for the ith argument.
 561    NULL if contexts are not computed.  */
 562 static inline struct ipa_polymorphic_call_context *
 563 ipa_get_ith_polymorhic_call_context (struct ipa_edge_args *args, int i)
 564 {
 565   if (!args->polymorphic_call_contexts)
 566     return NULL;
 567   return &(*args->polymorphic_call_contexts)[i];
 568 }
 569
 570 /* Function summary for ipa_node_params.  */
 571 class ipa_node_params_t: public function_summary <ipa_node_params *>
 572 {
 573 public:
 574   ipa_node_params_t (symbol_table *table):
 575     function_summary<ipa_node_params *> (table) { }
 576
 577   /* Hook that is called by summary when a node is duplicated.  */
 578   virtual void duplicate (cgraph_node *node,
 579                           cgraph_node *node2,
 580                           ipa_node_params *data,
 581                           ipa_node_params *data2);
 582 };
 583
 584 /* Function summary where the parameter infos are actually stored. */
 585 extern ipa_node_params_t *ipa_node_params_sum;
 586 /* Vector of IPA-CP transformation data for each clone.  */
 587 extern GTY(()) vec<ipcp_transformation_summary, va_gc> *ipcp_transformations;
 588 /* Vector where the parameter infos are actually stored. */
 589 extern GTY(()) vec<ipa_edge_args, va_gc> *ipa_edge_args_vector;
 590
 591 /* Return the associated parameter/argument info corresponding to the given
 592    node/edge.  */
 593 #define IPA_NODE_REF(NODE) (ipa_node_params_sum->get (NODE))
 594 #define IPA_EDGE_REF(EDGE) (&(*ipa_edge_args_vector)[(EDGE)->uid])
 595 /* This macro checks validity of index returned by
 596    ipa_get_param_decl_index function.  */
 597 #define IS_VALID_JUMP_FUNC_INDEX(I) ((I) != -1)
 598
 599 /* Creating and freeing ipa_node_params and ipa_edge_args.  */
 600 void ipa_create_all_node_params (void);
 601 void ipa_create_all_edge_args (void);
 602 void ipa_free_edge_args_substructures (struct ipa_edge_args *);
 603 void ipa_free_all_node_params (void);
 604 void ipa_free_all_edge_args (void);
 605 void ipa_free_all_structures_after_ipa_cp (void);
 606 void ipa_free_all_structures_after_iinln (void);
 607
 608 void ipa_register_cgraph_hooks (void);
 609 int count_formal_params (tree fndecl);
 610
 611 /* This function ensures the array of node param infos is big enough to
 612    accommodate a structure for all nodes and reallocates it if not.  */
 613
 614 static inline void
 615 ipa_check_create_node_params (void)
 616 {
 617   if (!ipa_node_params_sum)
 618     ipa_node_params_sum = new ipa_node_params_t (symtab);
 619 }
 620
 621 /* This function ensures the array of edge arguments infos is big enough to
 622    accommodate a structure for all edges and reallocates it if not.  */
 623
 624 static inline void
 625 ipa_check_create_edge_args (void)
 626 {
 627   if (vec_safe_length (ipa_edge_args_vector)
 628       <= (unsigned) symtab->edges_max_uid)
 629     vec_safe_grow_cleared (ipa_edge_args_vector, symtab->edges_max_uid + 1);
 630 }
 631
 632 /* Returns true if the array of edge infos is large enough to accommodate an
 633    info for EDGE.  The main purpose of this function is that debug dumping
 634    function can check info availability without causing reallocations.  */
 635
 636 static inline bool
 637 ipa_edge_args_info_available_for_edge_p (struct cgraph_edge *edge)
 638 {
 639   return ((unsigned) edge->uid < vec_safe_length (ipa_edge_args_vector));
 640 }
 641
 642 static inline ipcp_transformation_summary *
 643 ipcp_get_transformation_summary (cgraph_node *node)
 644 {
 645   if ((unsigned) node->uid >= vec_safe_length (ipcp_transformations))
 646     return NULL;
 647   return &(*ipcp_transformations)[node->uid];
 648 }
 649
 650 /* Return the aggregate replacements for NODE, if there are any.  */
 651
 652 static inline struct ipa_agg_replacement_value *
 653 ipa_get_agg_replacements_for_node (cgraph_node *node)
 654 {
 655   ipcp_transformation_summary *ts = ipcp_get_transformation_summary (node);
 656   return ts ? ts->agg_values : NULL;
 657 }
 658
 659 /* Function formal parameters related computations.  */
 660 void ipa_initialize_node_params (struct cgraph_node *node);
 661 bool ipa_propagate_indirect_call_infos (struct cgraph_edge *cs,
 662                                         vec<cgraph_edge *> *new_edges);
 663
 664 /* Indirect edge and binfo processing.  */
 665 tree ipa_get_indirect_edge_target (struct cgraph_edge *ie,
 666                                    vec<tree> ,
 667                                    vec<ipa_polymorphic_call_context>,
 668                                    vec<ipa_agg_jump_function_p>,
 669                                    bool *);
 670 struct cgraph_edge *ipa_make_edge_direct_to_target (struct cgraph_edge *, tree,
 671                                                     bool speculative = false);
 672 tree ipa_impossible_devirt_target (struct cgraph_edge *, tree);
 673
 674 /* Functions related to both.  */
 675 void ipa_analyze_node (struct cgraph_node *);
 676
 677 /* Aggregate jump function related functions.  */
 678 tree ipa_find_agg_cst_for_param (struct ipa_agg_jump_function *agg, tree scalar,
 679                                  HOST_WIDE_INT offset, bool by_ref,
 680                                  bool *from_global_constant = NULL);
 681 bool ipa_load_from_parm_agg (struct ipa_func_body_info *fbi,
 682                              vec<ipa_param_descriptor> descriptors,
 683                              gimple *stmt, tree op, int *index_p,
 684                              HOST_WIDE_INT *offset_p, HOST_WIDE_INT *size_p,
 685                              bool *by_ref, bool *guaranteed_unmodified = NULL);
 686
 687 /* Debugging interface.  */
 688 void ipa_print_node_params (FILE *, struct cgraph_node *node);
 689 void ipa_print_all_params (FILE *);
 690 void ipa_print_node_jump_functions (FILE *f, struct cgraph_node *node);
 691 void ipa_print_all_jump_functions (FILE * f);
 692 void ipcp_verify_propagated_values (void);
 693
 694 template <typename value>
 695 class ipcp_value;
 696
 697 extern object_allocator<ipcp_value<tree> > ipcp_cst_values_pool;
 698 extern object_allocator<ipcp_value<ipa_polymorphic_call_context> >
 699   ipcp_poly_ctx_values_pool;
 700
 701 template <typename valtype>
 702 class ipcp_value_source;
 703
 704 extern object_allocator<ipcp_value_source<tree> > ipcp_sources_pool;
 705
 706 class ipcp_agg_lattice;
 707
 708 extern object_allocator<ipcp_agg_lattice> ipcp_agg_lattice_pool;
 709
 710 /* Operation to be performed for the parameter in ipa_parm_adjustment
 711    below.  */
 712 enum ipa_parm_op {
 713   IPA_PARM_OP_NONE,
 714
 715   /* This describes a brand new parameter.
 716
 717      The field `type' should be set to the new type, `arg_prefix'
 718      should be set to the string prefix for the new DECL_NAME, and
 719      `new_decl' will ultimately hold the newly created argument.  */
 720   IPA_PARM_OP_NEW,
 721
 722   /* This new parameter is an unmodified parameter at index base_index. */
 723   IPA_PARM_OP_COPY,
 724
 725   /* This adjustment describes a parameter that is about to be removed
 726      completely.  Most users will probably need to book keep those so that they
 727      don't leave behinfd any non default def ssa names belonging to them.  */
 728   IPA_PARM_OP_REMOVE
 729 };
 730
 731 /* Structure to describe transformations of formal parameters and actual
 732    arguments.  Each instance describes one new parameter and they are meant to
 733    be stored in a vector.  Additionally, most users will probably want to store
 734    adjustments about parameters that are being removed altogether so that SSA
 735    names belonging to them can be replaced by SSA names of an artificial
 736    variable.  */
 737 struct ipa_parm_adjustment
 738 {
 739   /* The original PARM_DECL itself, helpful for processing of the body of the
 740      function itself.  Intended for traversing function bodies.
 741      ipa_modify_formal_parameters, ipa_modify_call_arguments and
 742      ipa_combine_adjustments ignore this and use base_index.
 743      ipa_modify_formal_parameters actually sets this.  */
 744   tree base;
 745
 746   /* Type of the new parameter.  However, if by_ref is true, the real type will
 747      be a pointer to this type.  */
 748   tree type;
 749
 750   /* Alias refrerence type to be used in MEM_REFs when adjusting caller
 751      arguments.  */
 752   tree alias_ptr_type;
 753
 754   /* The new declaration when creating/replacing a parameter.  Created
 755      by ipa_modify_formal_parameters, useful for functions modifying
 756      the body accordingly.  For brand new arguments, this is the newly
 757      created argument.  */
 758   tree new_decl;
 759
 760   /* New declaration of a substitute variable that we may use to replace all
 761      non-default-def ssa names when a parm decl is going away.  */
 762   tree new_ssa_base;
 763
 764   /* If non-NULL and the original parameter is to be removed (copy_param below
 765      is NULL), this is going to be its nonlocalized vars value.  */
 766   tree nonlocal_value;
 767
 768   /* This holds the prefix to be used for the new DECL_NAME.  */
 769   const char *arg_prefix;
 770
 771   /* Offset into the original parameter (for the cases when the new parameter
 772      is a component of an original one).  */
 773   HOST_WIDE_INT offset;
 774
 775   /* Zero based index of the original parameter this one is based on.  */
 776   int base_index;
 777
 778   /* Whether this parameter is a new parameter, a copy of an old one,
 779      or one about to be removed.  */
 780   enum ipa_parm_op op;
 781
 782   /* Storage order of the original parameter (for the cases when the new
 783      parameter is a component of an original one).  */
 784   unsigned reverse : 1;
 785
 786   /* The parameter is to be passed by reference.  */
 787   unsigned by_ref : 1;
 788 };
 789
 790 typedef vec<ipa_parm_adjustment> ipa_parm_adjustment_vec;
 791
 792 vec<tree> ipa_get_vector_of_formal_parms (tree fndecl);
 793 vec<tree> ipa_get_vector_of_formal_parm_types (tree fntype);
 794 void ipa_modify_formal_parameters (tree fndecl, ipa_parm_adjustment_vec);
 795 void ipa_modify_call_arguments (struct cgraph_edge *, gcall *,
 796                                 ipa_parm_adjustment_vec);
 797 ipa_parm_adjustment_vec ipa_combine_adjustments (ipa_parm_adjustment_vec,
 798                                                  ipa_parm_adjustment_vec);
 799 void ipa_dump_param_adjustments (FILE *, ipa_parm_adjustment_vec, tree);
 800 void ipa_dump_agg_replacement_values (FILE *f,
 801                                       struct ipa_agg_replacement_value *av);
 802 void ipa_prop_write_jump_functions (void);
 803 void ipa_prop_read_jump_functions (void);
 804 void ipcp_write_transformation_summaries (void);
 805 void ipcp_read_transformation_summaries (void);
 806 void ipa_update_after_lto_read (void);
 807 int ipa_get_param_decl_index (struct ipa_node_params *, tree);
 808 tree ipa_value_from_jfunc (struct ipa_node_params *info,
 809                            struct ipa_jump_func *jfunc);
 810 unsigned int ipcp_transform_function (struct cgraph_node *node);
 811 ipa_polymorphic_call_context ipa_context_from_jfunc (ipa_node_params *,
 812                                                      cgraph_edge *,
 813                                                      int,
 814                                                      ipa_jump_func *);
 815 void ipa_dump_param (FILE *, struct ipa_node_params *info, int i);
 816 bool ipa_modify_expr (tree *, bool, ipa_parm_adjustment_vec);
 817 ipa_parm_adjustment *ipa_get_adjustment_candidate (tree **, bool *,
 818                                                    ipa_parm_adjustment_vec,
 819                                                    bool);
 820 void ipa_release_body_info (struct ipa_func_body_info *);
 821
 822 /* From tree-sra.c:  */
 823 tree build_ref_for_offset (location_t, tree, HOST_WIDE_INT, bool, tree,
 824                            gimple_stmt_iterator *, bool);
 825
 826 /* In ipa-cp.c  */
 827 void ipa_cp_c_finalize (void);
 828
 829 #endif /* IPA_PROP_H */