gcc/ipa-prop.h

   1 /* Interprocedural analyses.
   2    Copyright (C) 2005-2014 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
  24 /* The following definitions and interfaces are used by
  25    interprocedural analyses or parameters.  */
  26
  27 #define IPA_UNDESCRIBED_USE -1
  28
  29 /* ipa-prop.c stuff (ipa-cp, indirect inlining):  */
  30
  31 /* A jump function for a callsite represents the values passed as actual
  32    arguments of the callsite.  They were originally proposed in a paper called
  33    "Interprocedural Constant Propagation", by David Callahan, Keith D Cooper,
  34    Ken Kennedy, Linda Torczon in Comp86, pg 152-161.  There are three main
  35    types of values :
  36
  37    Pass-through - the caller's formal parameter is passed as an actual
  38                   argument, possibly one simple operation performed on it.
  39    Constant     - a constant (is_gimple_ip_invariant)is passed as an actual
  40                   argument.
  41    Unknown      - neither of the above.
  42
  43    IPA_JF_ANCESTOR is a special pass-through jump function, which means that
  44    the result is an address of a part of the object pointed to by the formal
  45    parameter to which the function refers.  It is mainly intended to represent
  46    getting addresses of of ancestor fields in C++
  47    (e.g. &this_1(D)->D.1766.D.1756).  Note that if the original pointer is
  48    NULL, ancestor jump function must behave like a simple pass-through.
  49
  50    Other pass-through functions can either simply pass on an unchanged formal
  51    parameter or can apply one simple binary operation to it (such jump
  52    functions are called polynomial).
  53
  54    Jump functions are computed in ipa-prop.c by function
  55    update_call_notes_after_inlining.  Some information can be lost and jump
  56    functions degraded accordingly when inlining, see
  57    update_call_notes_after_inlining in the same file.  */
  58
  59 enum jump_func_type
  60 {
  61   IPA_JF_UNKNOWN = 0,  /* newly allocated and zeroed jump functions default */
  62   IPA_JF_CONST,             /* represented by field costant */
  63   IPA_JF_PASS_THROUGH,      /* represented by field pass_through */
  64   IPA_JF_ANCESTOR           /* represented by field ancestor */
  65 };
  66
  67 struct ipa_cst_ref_desc;
  68
  69 /* Structure holding data required to describe a constant jump function.  */
  70 struct GTY(()) ipa_constant_data
  71 {
  72   /* THe value of the constant.  */
  73   tree value;
  74   /* Pointer to the structure that describes the reference.  */
  75   struct ipa_cst_ref_desc GTY((skip)) *rdesc;
  76 };
  77
  78 /* Structure holding data required to describe a pass-through jump function.  */
  79
  80 struct GTY(()) ipa_pass_through_data
  81 {
  82   /* If an operation is to be performed on the original parameter, this is the
  83      second (constant) operand.  */
  84   tree operand;
  85   /* Number of the caller's formal parameter being passed.  */
  86   int formal_id;
  87   /* Operation that is performed on the argument before it is passed on.
  88      NOP_EXPR means no operation.  Otherwise oper must be a simple binary
  89      arithmetic operation where the caller's parameter is the first operand and
  90      operand field from this structure is the second one.  */
  91   enum tree_code operation;
  92   /* When the passed value is a pointer, it is set to true only when we are
  93      certain that no write to the object it points to has occurred since the
  94      caller functions started execution, except for changes noted in the
  95      aggregate part of the jump function (see description of
  96      ipa_agg_jump_function).  The flag is used only when the operation is
  97      NOP_EXPR.  */
  98   unsigned agg_preserved : 1;
  99 };
 100
 101 /* Structure holding data required to describe an ancestor pass-through
 102    jump function.  */
 103
 104 struct GTY(()) ipa_ancestor_jf_data
 105 {
 106   /* Offset of the field representing the ancestor.  */
 107   HOST_WIDE_INT offset;
 108   /* Number of the caller's formal parameter being passed.  */
 109   int formal_id;
 110   /* Flag with the same meaning like agg_preserve in ipa_pass_through_data.  */
 111   unsigned agg_preserved : 1;
 112 };
 113
 114 /* An element in an aggegate part of a jump function describing a known value
 115    at a given offset.  When it is part of a pass-through jump function with
 116    agg_preserved set or an ancestor jump function with agg_preserved set, all
 117    unlisted positions are assumed to be preserved but the value can be a type
 118    node, which means that the particular piece (starting at offset and having
 119    the size of the type) is clobbered with an unknown value.  When
 120    agg_preserved is false or the type of the containing jump function is
 121    different, all unlisted parts are assumed to be unknown and all values must
 122    fulfill is_gimple_ip_invariant.  */
 123
 124 struct GTY(()) ipa_agg_jf_item
 125 {
 126   /* The offset at which the known value is located within the aggregate.  */
 127   HOST_WIDE_INT offset;
 128
 129   /* The known constant or type if this is a clobber.  */
 130   tree value;
 131 };
 132
 133
 134 /* Aggregate jump function - i.e. description of contents of aggregates passed
 135    either by reference or value.  */
 136
 137 struct GTY(()) ipa_agg_jump_function
 138 {
 139   /* Description of the individual items.  */
 140   vec<ipa_agg_jf_item, va_gc> *items;
 141   /* True if the data was passed by reference (as opposed to by value). */
 142   bool by_ref;
 143 };
 144
 145 typedef struct ipa_agg_jump_function *ipa_agg_jump_function_p;
 146
 147 /* A jump function for a callsite represents the values passed as actual
 148    arguments of the callsite. See enum jump_func_type for the various
 149    types of jump functions supported.  */
 150 struct GTY (()) ipa_jump_func
 151 {
 152   /* Aggregate contants description.  See struct ipa_agg_jump_function and its
 153      description.  */
 154   struct ipa_agg_jump_function agg;
 155
 156   enum jump_func_type type;
 157   /* Represents a value of a jump function.  pass_through is used only in jump
 158      function context.  constant represents the actual constant in constant jump
 159      functions and member_cst holds constant c++ member functions.  */
 160   union jump_func_value
 161   {
 162     struct ipa_constant_data GTY ((tag ("IPA_JF_CONST"))) constant;
 163     struct ipa_pass_through_data GTY ((tag ("IPA_JF_PASS_THROUGH"))) pass_through;
 164     struct ipa_ancestor_jf_data GTY ((tag ("IPA_JF_ANCESTOR"))) ancestor;
 165   } GTY ((desc ("%1.type"))) value;
 166 };
 167
 168
 169 /* Return the constant stored in a constant jump functin JFUNC.  */
 170
 171 static inline tree
 172 ipa_get_jf_constant (struct ipa_jump_func *jfunc)
 173 {
 174   gcc_checking_assert (jfunc->type == IPA_JF_CONST);
 175   return jfunc->value.constant.value;
 176 }
 177
 178 static inline struct ipa_cst_ref_desc *
 179 ipa_get_jf_constant_rdesc (struct ipa_jump_func *jfunc)
 180 {
 181   gcc_checking_assert (jfunc->type == IPA_JF_CONST);
 182   return jfunc->value.constant.rdesc;
 183 }
 184
 185 /* Return the operand of a pass through jmp function JFUNC.  */
 186
 187 static inline tree
 188 ipa_get_jf_pass_through_operand (struct ipa_jump_func *jfunc)
 189 {
 190   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 191   return jfunc->value.pass_through.operand;
 192 }
 193
 194 /* Return the number of the caller's formal parameter that a pass through jump
 195    function JFUNC refers to.  */
 196
 197 static inline int
 198 ipa_get_jf_pass_through_formal_id (struct ipa_jump_func *jfunc)
 199 {
 200   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 201   return jfunc->value.pass_through.formal_id;
 202 }
 203
 204 /* Return operation of a pass through jump function JFUNC.  */
 205
 206 static inline enum tree_code
 207 ipa_get_jf_pass_through_operation (struct ipa_jump_func *jfunc)
 208 {
 209   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 210   return jfunc->value.pass_through.operation;
 211 }
 212
 213 /* Return the agg_preserved flag of a pass through jump function JFUNC.  */
 214
 215 static inline bool
 216 ipa_get_jf_pass_through_agg_preserved (struct ipa_jump_func *jfunc)
 217 {
 218   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 219   return jfunc->value.pass_through.agg_preserved;
 220 }
 221
 222 /* Return true if pass through jump function JFUNC preserves type
 223    information.  */
 224
 225 static inline bool
 226 ipa_get_jf_pass_through_type_preserved (struct ipa_jump_func *jfunc)
 227 {
 228   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 229   return jfunc->value.pass_through.agg_preserved;
 230 }
 231
 232 /* Return the offset of an ancestor jump function JFUNC.  */
 233
 234 static inline HOST_WIDE_INT
 235 ipa_get_jf_ancestor_offset (struct ipa_jump_func *jfunc)
 236 {
 237   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 238   return jfunc->value.ancestor.offset;
 239 }
 240
 241 /* Return the number of the caller's formal parameter that an ancestor jump
 242    function JFUNC refers to.  */
 243
 244 static inline int
 245 ipa_get_jf_ancestor_formal_id (struct ipa_jump_func *jfunc)
 246 {
 247   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 248   return jfunc->value.ancestor.formal_id;
 249 }
 250
 251 /* Return the agg_preserved flag of an ancestor jump function JFUNC.  */
 252
 253 static inline bool
 254 ipa_get_jf_ancestor_agg_preserved (struct ipa_jump_func *jfunc)
 255 {
 256   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 257   return jfunc->value.ancestor.agg_preserved;
 258 }
 259
 260 /* Return true if ancestor jump function JFUNC presrves type information.  */
 261
 262 static inline bool
 263 ipa_get_jf_ancestor_type_preserved (struct ipa_jump_func *jfunc)
 264 {
 265   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 266   return jfunc->value.ancestor.agg_preserved;
 267 }
 268
 269 /* Summary describing a single formal parameter.  */
 270
 271 struct ipa_param_descriptor
 272 {
 273   /* PARAM_DECL of this parameter.  */
 274   tree decl;
 275   /* If all uses of the parameter are described by ipa-prop structures, this
 276      says how many there are.  If any use could not be described by means of
 277      ipa-prop structures, this is IPA_UNDESCRIBED_USE.  */
 278   int controlled_uses;
 279   unsigned int move_cost : 31;
 280   /* The parameter is used.  */
 281   unsigned used : 1;
 282 };
 283
 284 /* ipa_node_params stores information related to formal parameters of functions
 285    and some other information for interprocedural passes that operate on
 286    parameters (such as ipa-cp).  */
 287
 288 struct ipa_node_params
 289 {
 290   /* Information about individual formal parameters that are gathered when
 291      summaries are generated. */
 292   vec<ipa_param_descriptor> descriptors;
 293   /* Pointer to an array of structures describing individual formal
 294      parameters.  */
 295   struct ipcp_param_lattices *lattices;
 296   /* Only for versioned nodes this field would not be NULL,
 297      it points to the node that IPA cp cloned from.  */
 298   struct cgraph_node *ipcp_orig_node;
 299   /* If this node is an ipa-cp clone, these are the known constants that
 300      describe what it has been specialized for.  */
 301   vec<tree> known_csts;
 302   /* If this node is an ipa-cp clone, these are the known polymorphic contexts
 303      that describe what it has been specialized for.  */
 304   vec<ipa_polymorphic_call_context> known_contexts;
 305   /* Whether the param uses analysis and jump function computation has already
 306      been performed.  */
 307   unsigned analysis_done : 1;
 308   /* Whether the function is enqueued in ipa-cp propagation stack.  */
 309   unsigned node_enqueued : 1;
 310   /* Whether we should create a specialized version based on values that are
 311      known to be constant in all contexts.  */
 312   unsigned do_clone_for_all_contexts : 1;
 313   /* Set if this is an IPA-CP clone for all contexts.  */
 314   unsigned is_all_contexts_clone : 1;
 315   /* Node has been completely replaced by clones and will be removed after
 316      ipa-cp is finished.  */
 317   unsigned node_dead : 1;
 318 };
 319
 320 /* ipa_node_params access functions.  Please use these to access fields that
 321    are or will be shared among various passes.  */
 322
 323 /* Return the number of formal parameters. */
 324
 325 static inline int
 326 ipa_get_param_count (struct ipa_node_params *info)
 327 {
 328   return info->descriptors.length ();
 329 }
 330
 331 /* Return the declaration of Ith formal parameter of the function corresponding
 332    to INFO.  Note there is no setter function as this array is built just once
 333    using ipa_initialize_node_params. */
 334
 335 static inline tree
 336 ipa_get_param (struct ipa_node_params *info, int i)
 337 {
 338   gcc_checking_assert (!flag_wpa);
 339   return info->descriptors[i].decl;
 340 }
 341
 342 /* Return the move cost of Ith formal parameter of the function corresponding
 343    to INFO.  */
 344
 345 static inline int
 346 ipa_get_param_move_cost (struct ipa_node_params *info, int i)
 347 {
 348   return info->descriptors[i].move_cost;
 349 }
 350
 351 /* Set the used flag corresponding to the Ith formal parameter of the function
 352    associated with INFO to VAL.  */
 353
 354 static inline void
 355 ipa_set_param_used (struct ipa_node_params *info, int i, bool val)
 356 {
 357   info->descriptors[i].used = val;
 358 }
 359
 360 /* Return how many uses described by ipa-prop a parameter has or
 361    IPA_UNDESCRIBED_USE if there is a use that is not described by these
 362    structures.  */
 363 static inline int
 364 ipa_get_controlled_uses (struct ipa_node_params *info, int i)
 365 {
 366   /* FIXME: introducing speuclation causes out of bounds access here.  */
 367   if (info->descriptors.length () > (unsigned)i)
 368     return info->descriptors[i].controlled_uses;
 369   return IPA_UNDESCRIBED_USE;
 370 }
 371
 372 /* Set the controlled counter of a given parameter.  */
 373
 374 static inline void
 375 ipa_set_controlled_uses (struct ipa_node_params *info, int i, int val)
 376 {
 377   info->descriptors[i].controlled_uses = val;
 378 }
 379
 380 /* Return the used flag corresponding to the Ith formal parameter of the
 381    function associated with INFO.  */
 382
 383 static inline bool
 384 ipa_is_param_used (struct ipa_node_params *info, int i)
 385 {
 386   return info->descriptors[i].used;
 387 }
 388
 389 /* Information about replacements done in aggregates for a given node (each
 390    node has its linked list).  */
 391 struct GTY(()) ipa_agg_replacement_value
 392 {
 393   /* Next item in the linked list.  */
 394   struct ipa_agg_replacement_value *next;
 395   /* Offset within the aggregate.  */
 396   HOST_WIDE_INT offset;
 397   /* The constant value.  */
 398   tree value;
 399   /* The paramter index.  */
 400   int index;
 401   /* Whether the value was passed by reference.  */
 402   bool by_ref;
 403 };
 404
 405 typedef struct ipa_agg_replacement_value *ipa_agg_replacement_value_p;
 406
 407 void ipa_set_node_agg_value_chain (struct cgraph_node *node,
 408                                    struct ipa_agg_replacement_value *aggvals);
 409
 410 /* ipa_edge_args stores information related to a callsite and particularly its
 411    arguments.  It can be accessed by the IPA_EDGE_REF macro.  */
 412 struct GTY(()) ipa_edge_args
 413 {
 414   /* Vector of the callsite's jump function of each parameter.  */
 415   vec<ipa_jump_func, va_gc> *jump_functions;
 416   vec<ipa_polymorphic_call_context, va_gc> *polymorphic_call_contexts;
 417 };
 418
 419 /* ipa_edge_args access functions.  Please use these to access fields that
 420    are or will be shared among various passes.  */
 421
 422 /* Return the number of actual arguments. */
 423
 424 static inline int
 425 ipa_get_cs_argument_count (struct ipa_edge_args *args)
 426 {
 427   return vec_safe_length (args->jump_functions);
 428 }
 429
 430 /* Returns a pointer to the jump function for the ith argument.  Please note
 431    there is no setter function as jump functions are all set up in
 432    ipa_compute_jump_functions. */
 433
 434 static inline struct ipa_jump_func *
 435 ipa_get_ith_jump_func (struct ipa_edge_args *args, int i)
 436 {
 437   return &(*args->jump_functions)[i];
 438 }
 439
 440 /* Returns a pointer to the polymorphic call context for the ith argument.
 441    NULL if contexts are not computed.  */
 442 static inline struct ipa_polymorphic_call_context *
 443 ipa_get_ith_polymorhic_call_context (struct ipa_edge_args *args, int i)
 444 {
 445   if (!args->polymorphic_call_contexts)
 446     return NULL;
 447   return &(*args->polymorphic_call_contexts)[i];
 448 }
 449
 450 /* Types of vectors holding the infos.  */
 451
 452 /* Vector where the parameter infos are actually stored. */
 453 extern vec<ipa_node_params> ipa_node_params_vector;
 454 /* Vector of known aggregate values in cloned nodes.  */
 455 extern GTY(()) vec<ipa_agg_replacement_value_p, va_gc> *ipa_node_agg_replacements;
 456 /* Vector where the parameter infos are actually stored. */
 457 extern GTY(()) vec<ipa_edge_args, va_gc> *ipa_edge_args_vector;
 458
 459 /* Return the associated parameter/argument info corresponding to the given
 460    node/edge.  */
 461 #define IPA_NODE_REF(NODE) (&ipa_node_params_vector[(NODE)->uid])
 462 #define IPA_EDGE_REF(EDGE) (&(*ipa_edge_args_vector)[(EDGE)->uid])
 463 /* This macro checks validity of index returned by
 464    ipa_get_param_decl_index function.  */
 465 #define IS_VALID_JUMP_FUNC_INDEX(I) ((I) != -1)
 466
 467 /* Creating and freeing ipa_node_params and ipa_edge_args.  */
 468 void ipa_create_all_node_params (void);
 469 void ipa_create_all_edge_args (void);
 470 void ipa_free_edge_args_substructures (struct ipa_edge_args *);
 471 void ipa_free_node_params_substructures (struct ipa_node_params *);
 472 void ipa_free_all_node_params (void);
 473 void ipa_free_all_edge_args (void);
 474 void ipa_free_all_structures_after_ipa_cp (void);
 475 void ipa_free_all_structures_after_iinln (void);
 476 void ipa_register_cgraph_hooks (void);
 477 int count_formal_params (tree fndecl);
 478
 479 /* This function ensures the array of node param infos is big enough to
 480    accommodate a structure for all nodes and reallocates it if not.  */
 481
 482 static inline void
 483 ipa_check_create_node_params (void)
 484 {
 485   if (!ipa_node_params_vector.exists ())
 486     ipa_node_params_vector.create (symtab->cgraph_max_uid);
 487
 488   if (ipa_node_params_vector.length () <= (unsigned) symtab->cgraph_max_uid)
 489     ipa_node_params_vector.safe_grow_cleared (symtab->cgraph_max_uid + 1);
 490 }
 491
 492 /* This function ensures the array of edge arguments infos is big enough to
 493    accommodate a structure for all edges and reallocates it if not.  */
 494
 495 static inline void
 496 ipa_check_create_edge_args (void)
 497 {
 498   if (vec_safe_length (ipa_edge_args_vector)
 499       <= (unsigned) symtab->edges_max_uid)
 500     vec_safe_grow_cleared (ipa_edge_args_vector, symtab->edges_max_uid + 1);
 501 }
 502
 503 /* Returns true if the array of edge infos is large enough to accommodate an
 504    info for EDGE.  The main purpose of this function is that debug dumping
 505    function can check info availability without causing reallocations.  */
 506
 507 static inline bool
 508 ipa_edge_args_info_available_for_edge_p (struct cgraph_edge *edge)
 509 {
 510   return ((unsigned) edge->uid < vec_safe_length (ipa_edge_args_vector));
 511 }
 512
 513 /* Return the aggregate replacements for NODE, if there are any.  */
 514
 515 static inline struct ipa_agg_replacement_value *
 516 ipa_get_agg_replacements_for_node (struct cgraph_node *node)
 517 {
 518   if ((unsigned) node->uid >= vec_safe_length (ipa_node_agg_replacements))
 519     return NULL;
 520   return (*ipa_node_agg_replacements)[node->uid];
 521 }
 522
 523 /* Function formal parameters related computations.  */
 524 void ipa_initialize_node_params (struct cgraph_node *node);
 525 bool ipa_propagate_indirect_call_infos (struct cgraph_edge *cs,
 526                                         vec<cgraph_edge *> *new_edges);
 527
 528 /* Indirect edge and binfo processing.  */
 529 tree ipa_get_indirect_edge_target (struct cgraph_edge *ie,
 530                                    vec<tree> ,
 531                                    vec<ipa_polymorphic_call_context>,
 532                                    vec<ipa_agg_jump_function_p>,
 533                                    bool *);
 534 struct cgraph_edge *ipa_make_edge_direct_to_target (struct cgraph_edge *, tree,
 535                                                     bool speculative = false);
 536 tree ipa_impossible_devirt_target (struct cgraph_edge *, tree);
 537
 538 /* Functions related to both.  */
 539 void ipa_analyze_node (struct cgraph_node *);
 540
 541 /* Aggregate jump function related functions.  */
 542 tree ipa_find_agg_cst_for_param (struct ipa_agg_jump_function *, HOST_WIDE_INT,
 543                                  bool);
 544 bool ipa_load_from_parm_agg (struct ipa_node_params *, gimple, tree, int *,
 545                              HOST_WIDE_INT *, bool *);
 546
 547 /* Debugging interface.  */
 548 void ipa_print_node_params (FILE *, struct cgraph_node *node);
 549 void ipa_print_all_params (FILE *);
 550 void ipa_print_node_jump_functions (FILE *f, struct cgraph_node *node);
 551 void ipa_print_all_jump_functions (FILE * f);
 552 void ipcp_verify_propagated_values (void);
 553
 554 extern alloc_pool ipcp_cst_values_pool;
 555 extern alloc_pool ipcp_poly_ctx_values_pool;
 556 extern alloc_pool ipcp_sources_pool;
 557 extern alloc_pool ipcp_agg_lattice_pool;
 558
 559 /* Operation to be performed for the parameter in ipa_parm_adjustment
 560    below.  */
 561 enum ipa_parm_op {
 562   IPA_PARM_OP_NONE,
 563
 564   /* This describes a brand new parameter.
 565
 566      The field `type' should be set to the new type, `arg_prefix'
 567      should be set to the string prefix for the new DECL_NAME, and
 568      `new_decl' will ultimately hold the newly created argument.  */
 569   IPA_PARM_OP_NEW,
 570
 571   /* This new parameter is an unmodified parameter at index base_index. */
 572   IPA_PARM_OP_COPY,
 573
 574   /* This adjustment describes a parameter that is about to be removed
 575      completely.  Most users will probably need to book keep those so that they
 576      don't leave behinfd any non default def ssa names belonging to them.  */
 577   IPA_PARM_OP_REMOVE
 578 };
 579
 580 /* Structure to describe transformations of formal parameters and actual
 581    arguments.  Each instance describes one new parameter and they are meant to
 582    be stored in a vector.  Additionally, most users will probably want to store
 583    adjustments about parameters that are being removed altogether so that SSA
 584    names belonging to them can be replaced by SSA names of an artificial
 585    variable.  */
 586 struct ipa_parm_adjustment
 587 {
 588   /* The original PARM_DECL itself, helpful for processing of the body of the
 589      function itself.  Intended for traversing function bodies.
 590      ipa_modify_formal_parameters, ipa_modify_call_arguments and
 591      ipa_combine_adjustments ignore this and use base_index.
 592      ipa_modify_formal_parameters actually sets this.  */
 593   tree base;
 594
 595   /* Type of the new parameter.  However, if by_ref is true, the real type will
 596      be a pointer to this type.  */
 597   tree type;
 598
 599   /* Alias refrerence type to be used in MEM_REFs when adjusting caller
 600      arguments.  */
 601   tree alias_ptr_type;
 602
 603   /* The new declaration when creating/replacing a parameter.  Created
 604      by ipa_modify_formal_parameters, useful for functions modifying
 605      the body accordingly.  For brand new arguments, this is the newly
 606      created argument.  */
 607   tree new_decl;
 608
 609   /* New declaration of a substitute variable that we may use to replace all
 610      non-default-def ssa names when a parm decl is going away.  */
 611   tree new_ssa_base;
 612
 613   /* If non-NULL and the original parameter is to be removed (copy_param below
 614      is NULL), this is going to be its nonlocalized vars value.  */
 615   tree nonlocal_value;
 616
 617   /* This holds the prefix to be used for the new DECL_NAME.  */
 618   const char *arg_prefix;
 619
 620   /* Offset into the original parameter (for the cases when the new parameter
 621      is a component of an original one).  */
 622   HOST_WIDE_INT offset;
 623
 624   /* Zero based index of the original parameter this one is based on.  */
 625   int base_index;
 626
 627   /* Whether this parameter is a new parameter, a copy of an old one,
 628      or one about to be removed.  */
 629   enum ipa_parm_op op;
 630
 631   /* The parameter is to be passed by reference.  */
 632   unsigned by_ref : 1;
 633 };
 634
 635 typedef vec<ipa_parm_adjustment> ipa_parm_adjustment_vec;
 636
 637 vec<tree> ipa_get_vector_of_formal_parms (tree fndecl);
 638 vec<tree> ipa_get_vector_of_formal_parm_types (tree fntype);
 639 void ipa_modify_formal_parameters (tree fndecl, ipa_parm_adjustment_vec);
 640 void ipa_modify_call_arguments (struct cgraph_edge *, gcall *,
 641                                 ipa_parm_adjustment_vec);
 642 ipa_parm_adjustment_vec ipa_combine_adjustments (ipa_parm_adjustment_vec,
 643                                                  ipa_parm_adjustment_vec);
 644 void ipa_dump_param_adjustments (FILE *, ipa_parm_adjustment_vec, tree);
 645 void ipa_dump_agg_replacement_values (FILE *f,
 646                                       struct ipa_agg_replacement_value *av);
 647 void ipa_prop_write_jump_functions (void);
 648 void ipa_prop_read_jump_functions (void);
 649 void ipa_prop_write_all_agg_replacement (void);
 650 void ipa_prop_read_all_agg_replacement (void);
 651 void ipa_update_after_lto_read (void);
 652 int ipa_get_param_decl_index (struct ipa_node_params *, tree);
 653 tree ipa_value_from_jfunc (struct ipa_node_params *info,
 654                            struct ipa_jump_func *jfunc);
 655 unsigned int ipcp_transform_function (struct cgraph_node *node);
 656 ipa_polymorphic_call_context ipa_context_from_jfunc (ipa_node_params *,
 657                                                      cgraph_edge *,
 658                                                      int,
 659                                                      ipa_jump_func *);
 660 void ipa_dump_param (FILE *, struct ipa_node_params *info, int i);
 661 bool ipa_modify_expr (tree *, bool, ipa_parm_adjustment_vec);
 662 ipa_parm_adjustment *ipa_get_adjustment_candidate (tree **, bool *,
 663                                                    ipa_parm_adjustment_vec,
 664                                                    bool);
 665
 666
 667 /* From tree-sra.c:  */
 668 tree build_ref_for_offset (location_t, tree, HOST_WIDE_INT, tree,
 669                            gimple_stmt_iterator *, bool);
 670
 671 /* In ipa-cp.c  */
 672 void ipa_cp_c_finalize (void);
 673
 674 #endif /* IPA_PROP_H */