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 "vec.h"
  24 #include "cgraph.h"
  25 #include "alloc-pool.h"
  26
  27 /* The following definitions and interfaces are used by
  28    interprocedural analyses or parameters.  */
  29
  30 #define IPA_UNDESCRIBED_USE -1
  31
  32 /* ipa-prop.c stuff (ipa-cp, indirect inlining):  */
  33
  34 /* A jump function for a callsite represents the values passed as actual
  35    arguments of the callsite.  They were originally proposed in a paper called
  36    "Interprocedural Constant Propagation", by David Callahan, Keith D Cooper,
  37    Ken Kennedy, Linda Torczon in Comp86, pg 152-161.  There are three main
  38    types of values :
  39
  40    Pass-through - the caller's formal parameter is passed as an actual
  41                   argument, possibly one simple operation performed on it.
  42    Constant     - a constant (is_gimple_ip_invariant)is passed as an actual
  43                   argument.
  44    Unknown      - neither of the above.
  45
  46    IPA_JF_ANCESTOR is a special pass-through jump function, which means that
  47    the result is an address of a part of the object pointed to by the formal
  48    parameter to which the function refers.  It is mainly intended to represent
  49    getting addresses of of ancestor fields in C++
  50    (e.g. &this_1(D)->D.1766.D.1756).  Note that if the original pointer is
  51    NULL, ancestor jump function must behave like a simple pass-through.
  52
  53    Other pass-through functions can either simply pass on an unchanged formal
  54    parameter or can apply one simple binary operation to it (such jump
  55    functions are called polynomial).
  56
  57    IPA_JF_KNOWN_TYPE is a special type of an "unknown" function that applies
  58    only to pointer parameters.  It means that even though we cannot prove that
  59    the passed value is an interprocedural constant, we still know the exact
  60    type of the containing object which may be valuable for devirtualization.
  61
  62    Jump functions are computed in ipa-prop.c by function
  63    update_call_notes_after_inlining.  Some information can be lost and jump
  64    functions degraded accordingly when inlining, see
  65    update_call_notes_after_inlining in the same file.  */
  66
  67 enum jump_func_type
  68 {
  69   IPA_JF_UNKNOWN = 0,  /* newly allocated and zeroed jump functions default */
  70   IPA_JF_KNOWN_TYPE,        /* represented by field known_type */
  71   IPA_JF_CONST,             /* represented by field costant */
  72   IPA_JF_PASS_THROUGH,      /* represented by field pass_through */
  73   IPA_JF_ANCESTOR           /* represented by field ancestor */
  74 };
  75
  76 /* Structure holding data required to describe a known type jump function.  */
  77 struct GTY(()) ipa_known_type_data
  78 {
  79   /* Offset of the component of the base_type being described.  */
  80   HOST_WIDE_INT offset;
  81   /* Type of the whole object.  */
  82   tree base_type;
  83   /* Type of the component of the object that is being described.  */
  84   tree component_type;
  85 };
  86
  87 struct ipa_cst_ref_desc;
  88
  89 /* Structure holding data required to describe a constant jump function.  */
  90 struct GTY(()) ipa_constant_data
  91 {
  92   /* THe value of the constant.  */
  93   tree value;
  94   /* Pointer to the structure that describes the reference.  */
  95   struct ipa_cst_ref_desc GTY((skip)) *rdesc;
  96 };
  97
  98 /* Structure holding data required to describe a pass-through jump function.  */
  99
 100 struct GTY(()) ipa_pass_through_data
 101 {
 102   /* If an operation is to be performed on the original parameter, this is the
 103      second (constant) operand.  */
 104   tree operand;
 105   /* Number of the caller's formal parameter being passed.  */
 106   int formal_id;
 107   /* Operation that is performed on the argument before it is passed on.
 108      NOP_EXPR means no operation.  Otherwise oper must be a simple binary
 109      arithmetic operation where the caller's parameter is the first operand and
 110      operand field from this structure is the second one.  */
 111   enum tree_code operation;
 112   /* When the passed value is a pointer, it is set to true only when we are
 113      certain that no write to the object it points to has occurred since the
 114      caller functions started execution, except for changes noted in the
 115      aggregate part of the jump function (see description of
 116      ipa_agg_jump_function).  The flag is used only when the operation is
 117      NOP_EXPR.  */
 118   unsigned agg_preserved : 1;
 119
 120   /* When set to true, we guarantee that, if there is a C++ object pointed to
 121      by this object, it does not undergo dynamic type change in the course of
 122      functions decribed by this jump function.  */
 123   unsigned type_preserved : 1;
 124 };
 125
 126 /* Structure holding data required to describe an ancestor pass-through
 127    jump function.  */
 128
 129 struct GTY(()) ipa_ancestor_jf_data
 130 {
 131   /* Offset of the field representing the ancestor.  */
 132   HOST_WIDE_INT offset;
 133   /* Type of the result.  */
 134   tree type;
 135   /* Number of the caller's formal parameter being passed.  */
 136   int formal_id;
 137   /* Flag with the same meaning like agg_preserve in ipa_pass_through_data.  */
 138   unsigned agg_preserved : 1;
 139   /* When set to true, we guarantee that, if there is a C++ object pointed to
 140      by this object, it does not undergo dynamic type change in the course of
 141      functions decribed by this jump function.  */
 142   unsigned type_preserved : 1;
 143 };
 144
 145 /* An element in an aggegate part of a jump function describing a known value
 146    at a given offset.  When it is part of a pass-through jump function with
 147    agg_preserved set or an ancestor jump function with agg_preserved set, all
 148    unlisted positions are assumed to be preserved but the value can be a type
 149    node, which means that the particular piece (starting at offset and having
 150    the size of the type) is clobbered with an unknown value.  When
 151    agg_preserved is false or the type of the containing jump function is
 152    different, all unlisted parts are assumed to be unknown and all values must
 153    fulfill is_gimple_ip_invariant.  */
 154
 155 typedef struct GTY(()) ipa_agg_jf_item
 156 {
 157   /* The offset at which the known value is located within the aggregate.  */
 158   HOST_WIDE_INT offset;
 159
 160   /* The known constant or type if this is a clobber.  */
 161   tree value;
 162 } ipa_agg_jf_item_t;
 163
 164
 165 /* Aggregate jump function - i.e. description of contents of aggregates passed
 166    either by reference or value.  */
 167
 168 struct GTY(()) ipa_agg_jump_function
 169 {
 170   /* Description of the individual items.  */
 171   vec<ipa_agg_jf_item_t, va_gc> *items;
 172   /* True if the data was passed by reference (as opposed to by value). */
 173   bool by_ref;
 174 };
 175
 176 typedef struct ipa_agg_jump_function *ipa_agg_jump_function_p;
 177 typedef struct ipa_agg_jump_function ipa_agg_jump_function_t;
 178
 179 /* A jump function for a callsite represents the values passed as actual
 180    arguments of the callsite. See enum jump_func_type for the various
 181    types of jump functions supported.  */
 182 typedef struct GTY (()) ipa_jump_func
 183 {
 184   /* Aggregate contants description.  See struct ipa_agg_jump_function and its
 185      description.  */
 186   struct ipa_agg_jump_function agg;
 187
 188   enum jump_func_type type;
 189   /* Represents a value of a jump function.  pass_through is used only in jump
 190      function context.  constant represents the actual constant in constant jump
 191      functions and member_cst holds constant c++ member functions.  */
 192   union jump_func_value
 193   {
 194     struct ipa_known_type_data GTY ((tag ("IPA_JF_KNOWN_TYPE"))) known_type;
 195     struct ipa_constant_data GTY ((tag ("IPA_JF_CONST"))) constant;
 196     struct ipa_pass_through_data GTY ((tag ("IPA_JF_PASS_THROUGH"))) pass_through;
 197     struct ipa_ancestor_jf_data GTY ((tag ("IPA_JF_ANCESTOR"))) ancestor;
 198   } GTY ((desc ("%1.type"))) value;
 199 } ipa_jump_func_t;
 200
 201
 202 /* Return the offset of the component that is described by a known type jump
 203    function JFUNC.  */
 204
 205 static inline HOST_WIDE_INT
 206 ipa_get_jf_known_type_offset (struct ipa_jump_func *jfunc)
 207 {
 208   gcc_checking_assert (jfunc->type == IPA_JF_KNOWN_TYPE);
 209   return jfunc->value.known_type.offset;
 210 }
 211
 212 /* Return the base type of a known type jump function JFUNC.  */
 213
 214 static inline tree
 215 ipa_get_jf_known_type_base_type (struct ipa_jump_func *jfunc)
 216 {
 217   gcc_checking_assert (jfunc->type == IPA_JF_KNOWN_TYPE);
 218   return jfunc->value.known_type.base_type;
 219 }
 220
 221 /* Return the component type of a known type jump function JFUNC.  */
 222
 223 static inline tree
 224 ipa_get_jf_known_type_component_type (struct ipa_jump_func *jfunc)
 225 {
 226   gcc_checking_assert (jfunc->type == IPA_JF_KNOWN_TYPE);
 227   return jfunc->value.known_type.component_type;
 228 }
 229
 230 /* Return the constant stored in a constant jump functin JFUNC.  */
 231
 232 static inline tree
 233 ipa_get_jf_constant (struct ipa_jump_func *jfunc)
 234 {
 235   gcc_checking_assert (jfunc->type == IPA_JF_CONST);
 236   return jfunc->value.constant.value;
 237 }
 238
 239 static inline struct ipa_cst_ref_desc *
 240 ipa_get_jf_constant_rdesc (struct ipa_jump_func *jfunc)
 241 {
 242   gcc_checking_assert (jfunc->type == IPA_JF_CONST);
 243   return jfunc->value.constant.rdesc;
 244 }
 245
 246 /* Return the operand of a pass through jmp function JFUNC.  */
 247
 248 static inline tree
 249 ipa_get_jf_pass_through_operand (struct ipa_jump_func *jfunc)
 250 {
 251   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 252   return jfunc->value.pass_through.operand;
 253 }
 254
 255 /* Return the number of the caller's formal parameter that a pass through jump
 256    function JFUNC refers to.  */
 257
 258 static inline int
 259 ipa_get_jf_pass_through_formal_id (struct ipa_jump_func *jfunc)
 260 {
 261   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 262   return jfunc->value.pass_through.formal_id;
 263 }
 264
 265 /* Return operation of a pass through jump function JFUNC.  */
 266
 267 static inline enum tree_code
 268 ipa_get_jf_pass_through_operation (struct ipa_jump_func *jfunc)
 269 {
 270   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 271   return jfunc->value.pass_through.operation;
 272 }
 273
 274 /* Return the agg_preserved flag of a pass through jump function JFUNC.  */
 275
 276 static inline bool
 277 ipa_get_jf_pass_through_agg_preserved (struct ipa_jump_func *jfunc)
 278 {
 279   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 280   return jfunc->value.pass_through.agg_preserved;
 281 }
 282
 283 /* Return the type_preserved flag of a pass through jump function JFUNC.  */
 284
 285 static inline bool
 286 ipa_get_jf_pass_through_type_preserved (struct ipa_jump_func *jfunc)
 287 {
 288   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 289   return jfunc->value.pass_through.type_preserved;
 290 }
 291
 292 /* Return the offset of an ancestor jump function JFUNC.  */
 293
 294 static inline HOST_WIDE_INT
 295 ipa_get_jf_ancestor_offset (struct ipa_jump_func *jfunc)
 296 {
 297   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 298   return jfunc->value.ancestor.offset;
 299 }
 300
 301 /* Return the result type of an ancestor jump function JFUNC.  */
 302
 303 static inline tree
 304 ipa_get_jf_ancestor_type (struct ipa_jump_func *jfunc)
 305 {
 306   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 307   return jfunc->value.ancestor.type;
 308 }
 309
 310 /* Return the number of the caller's formal parameter that an ancestor jump
 311    function JFUNC refers to.  */
 312
 313 static inline int
 314 ipa_get_jf_ancestor_formal_id (struct ipa_jump_func *jfunc)
 315 {
 316   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 317   return jfunc->value.ancestor.formal_id;
 318 }
 319
 320 /* Return the agg_preserved flag of an ancestor jump function JFUNC.  */
 321
 322 static inline bool
 323 ipa_get_jf_ancestor_agg_preserved (struct ipa_jump_func *jfunc)
 324 {
 325   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 326   return jfunc->value.ancestor.agg_preserved;
 327 }
 328
 329 /* Return the type_preserved flag of an ancestor jump function JFUNC.  */
 330
 331 static inline bool
 332 ipa_get_jf_ancestor_type_preserved (struct ipa_jump_func *jfunc)
 333 {
 334   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 335   return jfunc->value.ancestor.type_preserved;
 336 }
 337
 338 /* Summary describing a single formal parameter.  */
 339
 340 struct ipa_param_descriptor
 341 {
 342   /* PARAM_DECL of this parameter.  */
 343   tree decl;
 344   /* If all uses of the parameter are described by ipa-prop structures, this
 345      says how many there are.  If any use could not be described by means of
 346      ipa-prop structures, this is IPA_UNDESCRIBED_USE.  */
 347   int controlled_uses;
 348   unsigned int move_cost : 31;
 349   /* The parameter is used.  */
 350   unsigned used : 1;
 351 };
 352
 353 typedef struct ipa_param_descriptor ipa_param_descriptor_t;
 354 struct ipcp_lattice;
 355
 356 /* ipa_node_params stores information related to formal parameters of functions
 357    and some other information for interprocedural passes that operate on
 358    parameters (such as ipa-cp).  */
 359
 360 struct ipa_node_params
 361 {
 362   /* Information about individual formal parameters that are gathered when
 363      summaries are generated. */
 364   vec<ipa_param_descriptor_t> descriptors;
 365   /* Pointer to an array of structures describing individual formal
 366      parameters.  */
 367   struct ipcp_param_lattices *lattices;
 368   /* Only for versioned nodes this field would not be NULL,
 369      it points to the node that IPA cp cloned from.  */
 370   struct cgraph_node *ipcp_orig_node;
 371   /* If this node is an ipa-cp clone, these are the known values that describe
 372      what it has been specialized for.  */
 373   vec<tree> known_vals;
 374   /* Whether the param uses analysis has already been performed.  */
 375   unsigned uses_analysis_done : 1;
 376   /* Whether the function is enqueued in ipa-cp propagation stack.  */
 377   unsigned node_enqueued : 1;
 378   /* Whether we should create a specialized version based on values that are
 379      known to be constant in all contexts.  */
 380   unsigned do_clone_for_all_contexts : 1;
 381   /* Set if this is an IPA-CP clone for all contexts.  */
 382   unsigned is_all_contexts_clone : 1;
 383   /* Node has been completely replaced by clones and will be removed after
 384      ipa-cp is finished.  */
 385   unsigned node_dead : 1;
 386 };
 387
 388 /* ipa_node_params access functions.  Please use these to access fields that
 389    are or will be shared among various passes.  */
 390
 391 /* Return the number of formal parameters. */
 392
 393 static inline int
 394 ipa_get_param_count (struct ipa_node_params *info)
 395 {
 396   return info->descriptors.length ();
 397 }
 398
 399 /* Return the declaration of Ith formal parameter of the function corresponding
 400    to INFO.  Note there is no setter function as this array is built just once
 401    using ipa_initialize_node_params. */
 402
 403 static inline tree
 404 ipa_get_param (struct ipa_node_params *info, int i)
 405 {
 406   gcc_checking_assert (!flag_wpa);
 407   return info->descriptors[i].decl;
 408 }
 409
 410 /* Return the move cost of Ith formal parameter of the function corresponding
 411    to INFO.  */
 412
 413 static inline int
 414 ipa_get_param_move_cost (struct ipa_node_params *info, int i)
 415 {
 416   return info->descriptors[i].move_cost;
 417 }
 418
 419 /* Set the used flag corresponding to the Ith formal parameter of the function
 420    associated with INFO to VAL.  */
 421
 422 static inline void
 423 ipa_set_param_used (struct ipa_node_params *info, int i, bool val)
 424 {
 425   info->descriptors[i].used = val;
 426 }
 427
 428 /* Return how many uses described by ipa-prop a parameter has or
 429    IPA_UNDESCRIBED_USE if there is a use that is not described by these
 430    structures.  */
 431 static inline int
 432 ipa_get_controlled_uses (struct ipa_node_params *info, int i)
 433 {
 434   return info->descriptors[i].controlled_uses;
 435 }
 436
 437 /* Set the controlled counter of a given parameter.  */
 438
 439 static inline void
 440 ipa_set_controlled_uses (struct ipa_node_params *info, int i, int val)
 441 {
 442   info->descriptors[i].controlled_uses = val;
 443 }
 444
 445 /* Return the used flag corresponding to the Ith formal parameter of the
 446    function associated with INFO.  */
 447
 448 static inline bool
 449 ipa_is_param_used (struct ipa_node_params *info, int i)
 450 {
 451   return info->descriptors[i].used;
 452 }
 453
 454 /* Information about replacements done in aggregates for a given node (each
 455    node has its linked list).  */
 456 struct GTY(()) ipa_agg_replacement_value
 457 {
 458   /* Next item in the linked list.  */
 459   struct ipa_agg_replacement_value *next;
 460   /* Offset within the aggregate.  */
 461   HOST_WIDE_INT offset;
 462   /* The constant value.  */
 463   tree value;
 464   /* The paramter index.  */
 465   int index;
 466   /* Whether the value was passed by reference.  */
 467   bool by_ref;
 468 };
 469
 470 typedef struct ipa_agg_replacement_value *ipa_agg_replacement_value_p;
 471
 472 void ipa_set_node_agg_value_chain (struct cgraph_node *node,
 473                                    struct ipa_agg_replacement_value *aggvals);
 474
 475 /* ipa_edge_args stores information related to a callsite and particularly its
 476    arguments.  It can be accessed by the IPA_EDGE_REF macro.  */
 477 typedef struct GTY(()) ipa_edge_args
 478 {
 479   /* Vector of the callsite's jump function of each parameter.  */
 480   vec<ipa_jump_func_t, va_gc> *jump_functions;
 481 } ipa_edge_args_t;
 482
 483 /* ipa_edge_args access functions.  Please use these to access fields that
 484    are or will be shared among various passes.  */
 485
 486 /* Return the number of actual arguments. */
 487
 488 static inline int
 489 ipa_get_cs_argument_count (struct ipa_edge_args *args)
 490 {
 491   return vec_safe_length (args->jump_functions);
 492 }
 493
 494 /* Returns a pointer to the jump function for the ith argument.  Please note
 495    there is no setter function as jump functions are all set up in
 496    ipa_compute_jump_functions. */
 497
 498 static inline struct ipa_jump_func *
 499 ipa_get_ith_jump_func (struct ipa_edge_args *args, int i)
 500 {
 501   return &(*args->jump_functions)[i];
 502 }
 503
 504 /* Vectors need to have typedefs of structures.  */
 505 typedef struct ipa_node_params ipa_node_params_t;
 506
 507 /* Types of vectors holding the infos.  */
 508
 509 /* Vector where the parameter infos are actually stored. */
 510 extern vec<ipa_node_params_t> ipa_node_params_vector;
 511 /* Vector of known aggregate values in cloned nodes.  */
 512 extern GTY(()) vec<ipa_agg_replacement_value_p, va_gc> *ipa_node_agg_replacements;
 513 /* Vector where the parameter infos are actually stored. */
 514 extern GTY(()) vec<ipa_edge_args_t, va_gc> *ipa_edge_args_vector;
 515
 516 /* Return the associated parameter/argument info corresponding to the given
 517    node/edge.  */
 518 #define IPA_NODE_REF(NODE) (&ipa_node_params_vector[(NODE)->uid])
 519 #define IPA_EDGE_REF(EDGE) (&(*ipa_edge_args_vector)[(EDGE)->uid])
 520 /* This macro checks validity of index returned by
 521    ipa_get_param_decl_index function.  */
 522 #define IS_VALID_JUMP_FUNC_INDEX(I) ((I) != -1)
 523
 524 /* Creating and freeing ipa_node_params and ipa_edge_args.  */
 525 void ipa_create_all_node_params (void);
 526 void ipa_create_all_edge_args (void);
 527 void ipa_free_edge_args_substructures (struct ipa_edge_args *);
 528 void ipa_free_node_params_substructures (struct ipa_node_params *);
 529 void ipa_free_all_node_params (void);
 530 void ipa_free_all_edge_args (void);
 531 void ipa_free_all_structures_after_ipa_cp (void);
 532 void ipa_free_all_structures_after_iinln (void);
 533 void ipa_register_cgraph_hooks (void);
 534
 535 /* This function ensures the array of node param infos is big enough to
 536    accommodate a structure for all nodes and reallocates it if not.  */
 537
 538 static inline void
 539 ipa_check_create_node_params (void)
 540 {
 541   if (!ipa_node_params_vector.exists ())
 542     ipa_node_params_vector.create (cgraph_max_uid);
 543
 544   if (ipa_node_params_vector.length () <= (unsigned) cgraph_max_uid)
 545     ipa_node_params_vector.safe_grow_cleared (cgraph_max_uid + 1);
 546 }
 547
 548 /* This function ensures the array of edge arguments infos is big enough to
 549    accommodate a structure for all edges and reallocates it if not.  */
 550
 551 static inline void
 552 ipa_check_create_edge_args (void)
 553 {
 554   if (vec_safe_length (ipa_edge_args_vector) <= (unsigned) cgraph_edge_max_uid)
 555     vec_safe_grow_cleared (ipa_edge_args_vector, cgraph_edge_max_uid + 1);
 556 }
 557
 558 /* Returns true if the array of edge infos is large enough to accommodate an
 559    info for EDGE.  The main purpose of this function is that debug dumping
 560    function can check info availability without causing reallocations.  */
 561
 562 static inline bool
 563 ipa_edge_args_info_available_for_edge_p (struct cgraph_edge *edge)
 564 {
 565   return ((unsigned) edge->uid < vec_safe_length (ipa_edge_args_vector));
 566 }
 567
 568 /* Return the aggregate replacements for NODE, if there are any.  */
 569
 570 static inline struct ipa_agg_replacement_value *
 571 ipa_get_agg_replacements_for_node (struct cgraph_node *node)
 572 {
 573   if ((unsigned) node->uid >= vec_safe_length (ipa_node_agg_replacements))
 574     return NULL;
 575   return (*ipa_node_agg_replacements)[node->uid];
 576 }
 577
 578 /* Function formal parameters related computations.  */
 579 void ipa_initialize_node_params (struct cgraph_node *node);
 580 bool ipa_propagate_indirect_call_infos (struct cgraph_edge *cs,
 581                                         vec<cgraph_edge_p> *new_edges);
 582
 583 /* Indirect edge and binfo processing.  */
 584 tree ipa_get_indirect_edge_target (struct cgraph_edge *ie,
 585                                    vec<tree> ,
 586                                    vec<tree> ,
 587                                    vec<ipa_agg_jump_function_p> );
 588 struct cgraph_edge *ipa_make_edge_direct_to_target (struct cgraph_edge *, tree);
 589 tree ipa_binfo_from_known_type_jfunc (struct ipa_jump_func *);
 590 tree ipa_intraprocedural_devirtualization (gimple);
 591
 592 /* Functions related to both.  */
 593 void ipa_analyze_node (struct cgraph_node *);
 594
 595 /* Aggregate jump function related functions.  */
 596 tree ipa_find_agg_cst_for_param (struct ipa_agg_jump_function *, HOST_WIDE_INT,
 597                                  bool);
 598 bool ipa_load_from_parm_agg (struct ipa_node_params *, gimple, tree, int *,
 599                              HOST_WIDE_INT *, bool *);
 600
 601 /* Debugging interface.  */
 602 void ipa_print_node_params (FILE *, struct cgraph_node *node);
 603 void ipa_print_all_params (FILE *);
 604 void ipa_print_node_jump_functions (FILE *f, struct cgraph_node *node);
 605 void ipa_print_all_jump_functions (FILE * f);
 606 void ipcp_verify_propagated_values (void);
 607
 608 extern alloc_pool ipcp_values_pool;
 609 extern alloc_pool ipcp_sources_pool;
 610 extern alloc_pool ipcp_agg_lattice_pool;
 611
 612 /* Operation to be performed for the parameter in ipa_parm_adjustment
 613    below.  */
 614 enum ipa_parm_op {
 615   IPA_PARM_OP_NONE,
 616
 617   /* This describes a brand new parameter.
 618
 619      The field `type' should be set to the new type, `arg_prefix'
 620      should be set to the string prefix for the new DECL_NAME, and
 621      `new_decl' will ultimately hold the newly created argument.  */
 622   IPA_PARM_OP_NEW,
 623
 624   /* This new parameter is an unmodified parameter at index base_index. */
 625   IPA_PARM_OP_COPY,
 626
 627   /* This adjustment describes a parameter that is about to be removed
 628      completely.  Most users will probably need to book keep those so that they
 629      don't leave behinfd any non default def ssa names belonging to them.  */
 630   IPA_PARM_OP_REMOVE
 631 };
 632
 633 /* Structure to describe transformations of formal parameters and actual
 634    arguments.  Each instance describes one new parameter and they are meant to
 635    be stored in a vector.  Additionally, most users will probably want to store
 636    adjustments about parameters that are being removed altogether so that SSA
 637    names belonging to them can be replaced by SSA names of an artificial
 638    variable.  */
 639 struct ipa_parm_adjustment
 640 {
 641   /* The original PARM_DECL itself, helpful for processing of the body of the
 642      function itself.  Intended for traversing function bodies.
 643      ipa_modify_formal_parameters, ipa_modify_call_arguments and
 644      ipa_combine_adjustments ignore this and use base_index.
 645      ipa_modify_formal_parameters actually sets this.  */
 646   tree base;
 647
 648   /* Type of the new parameter.  However, if by_ref is true, the real type will
 649      be a pointer to this type.  */
 650   tree type;
 651
 652   /* Alias refrerence type to be used in MEM_REFs when adjusting caller
 653      arguments.  */
 654   tree alias_ptr_type;
 655
 656   /* The new declaration when creating/replacing a parameter.  Created
 657      by ipa_modify_formal_parameters, useful for functions modifying
 658      the body accordingly.  For brand new arguments, this is the newly
 659      created argument.  */
 660   tree new_decl;
 661
 662   /* New declaration of a substitute variable that we may use to replace all
 663      non-default-def ssa names when a parm decl is going away.  */
 664   tree new_ssa_base;
 665
 666   /* If non-NULL and the original parameter is to be removed (copy_param below
 667      is NULL), this is going to be its nonlocalized vars value.  */
 668   tree nonlocal_value;
 669
 670   /* This holds the prefix to be used for the new DECL_NAME.  */
 671   const char *arg_prefix;
 672
 673   /* Offset into the original parameter (for the cases when the new parameter
 674      is a component of an original one).  */
 675   HOST_WIDE_INT offset;
 676
 677   /* Zero based index of the original parameter this one is based on.  */
 678   int base_index;
 679
 680   /* Whether this parameter is a new parameter, a copy of an old one,
 681      or one about to be removed.  */
 682   enum ipa_parm_op op;
 683
 684   /* The parameter is to be passed by reference.  */
 685   unsigned by_ref : 1;
 686 };
 687
 688 typedef struct ipa_parm_adjustment ipa_parm_adjustment_t;
 689
 690 typedef vec<ipa_parm_adjustment_t> ipa_parm_adjustment_vec;
 691
 692 vec<tree> ipa_get_vector_of_formal_parms (tree fndecl);
 693 vec<tree> ipa_get_vector_of_formal_parm_types (tree fntype);
 694 void ipa_modify_formal_parameters (tree fndecl, ipa_parm_adjustment_vec);
 695 void ipa_modify_call_arguments (struct cgraph_edge *, gimple,
 696                                 ipa_parm_adjustment_vec);
 697 ipa_parm_adjustment_vec ipa_combine_adjustments (ipa_parm_adjustment_vec,
 698                                                  ipa_parm_adjustment_vec);
 699 void ipa_dump_param_adjustments (FILE *, ipa_parm_adjustment_vec, tree);
 700 void ipa_dump_agg_replacement_values (FILE *f,
 701                                       struct ipa_agg_replacement_value *av);
 702 void ipa_prop_write_jump_functions (void);
 703 void ipa_prop_read_jump_functions (void);
 704 void ipa_prop_write_all_agg_replacement (void);
 705 void ipa_prop_read_all_agg_replacement (void);
 706 void ipa_update_after_lto_read (void);
 707 int ipa_get_param_decl_index (struct ipa_node_params *, tree);
 708 tree ipa_value_from_jfunc (struct ipa_node_params *info,
 709                            struct ipa_jump_func *jfunc);
 710 unsigned int ipcp_transform_function (struct cgraph_node *node);
 711 void ipa_dump_param (FILE *, struct ipa_node_params *info, int i);
 712 bool ipa_modify_expr (tree *, bool, ipa_parm_adjustment_vec);
 713 ipa_parm_adjustment *ipa_get_adjustment_candidate (tree **, bool *,
 714                                                    ipa_parm_adjustment_vec,
 715                                                    bool);
 716
 717
 718 /* From tree-sra.c:  */
 719 tree build_ref_for_offset (location_t, tree, HOST_WIDE_INT, tree,
 720                            gimple_stmt_iterator *, bool);
 721
 722 #endif /* IPA_PROP_H */