source: arduino-1-6-7/trunk/fuentes/arduino-ide-amd64/hardware/tools/avr/lib/gcc/avr/4.9.2/plugin/include/ipa-prop.h @ 4837

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1/* Interprocedural analyses.
2   Copyright (C) 2005-2014 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify it under
7the terms of the GNU General Public License as published by the Free
8Software Foundation; either version 3, or (at your option) any later
9version.
10
11GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or
13FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14for more details.
15
16You should have received a copy of the GNU General Public License
17along 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
67enum 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.  */
77struct 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
87struct ipa_cst_ref_desc;
88
89/* Structure holding data required to describe a constant jump function.  */
90struct 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
100struct 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
129struct 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     When TYPE_PRESERVED is false, TYPE is NULL, since it is only
135     relevant for the devirtualization machinery.  */
136  tree type;
137  /* Number of the caller's formal parameter being passed.  */
138  int formal_id;
139  /* Flag with the same meaning like agg_preserve in ipa_pass_through_data.  */
140  unsigned agg_preserved : 1;
141  /* When set to true, we guarantee that, if there is a C++ object pointed to
142     by this object, it does not undergo dynamic type change in the course of
143     functions decribed by this jump function.  */
144  unsigned type_preserved : 1;
145};
146
147/* An element in an aggegate part of a jump function describing a known value
148   at a given offset.  When it is part of a pass-through jump function with
149   agg_preserved set or an ancestor jump function with agg_preserved set, all
150   unlisted positions are assumed to be preserved but the value can be a type
151   node, which means that the particular piece (starting at offset and having
152   the size of the type) is clobbered with an unknown value.  When
153   agg_preserved is false or the type of the containing jump function is
154   different, all unlisted parts are assumed to be unknown and all values must
155   fulfill is_gimple_ip_invariant.  */
156
157struct GTY(()) ipa_agg_jf_item
158{
159  /* The offset at which the known value is located within the aggregate.  */
160  HOST_WIDE_INT offset;
161
162  /* The known constant or type if this is a clobber.  */
163  tree value;
164};
165
166
167/* Aggregate jump function - i.e. description of contents of aggregates passed
168   either by reference or value.  */
169
170struct GTY(()) ipa_agg_jump_function
171{
172  /* Description of the individual items.  */
173  vec<ipa_agg_jf_item, va_gc> *items;
174  /* True if the data was passed by reference (as opposed to by value). */
175  bool by_ref;
176};
177
178typedef struct ipa_agg_jump_function *ipa_agg_jump_function_p;
179
180/* A jump function for a callsite represents the values passed as actual
181   arguments of the callsite. See enum jump_func_type for the various
182   types of jump functions supported.  */
183struct GTY (()) ipa_jump_func
184{
185  /* Aggregate contants description.  See struct ipa_agg_jump_function and its
186     description.  */
187  struct ipa_agg_jump_function agg;
188
189  enum jump_func_type type;
190  /* Represents a value of a jump function.  pass_through is used only in jump
191     function context.  constant represents the actual constant in constant jump
192     functions and member_cst holds constant c++ member functions.  */
193  union jump_func_value
194  {
195    struct ipa_known_type_data GTY ((tag ("IPA_JF_KNOWN_TYPE"))) known_type;
196    struct ipa_constant_data GTY ((tag ("IPA_JF_CONST"))) constant;
197    struct ipa_pass_through_data GTY ((tag ("IPA_JF_PASS_THROUGH"))) pass_through;
198    struct ipa_ancestor_jf_data GTY ((tag ("IPA_JF_ANCESTOR"))) ancestor;
199  } GTY ((desc ("%1.type"))) value;
200};
201
202
203/* Return the offset of the component that is described by a known type jump
204   function JFUNC.  */
205
206static inline HOST_WIDE_INT
207ipa_get_jf_known_type_offset (struct ipa_jump_func *jfunc)
208{
209  gcc_checking_assert (jfunc->type == IPA_JF_KNOWN_TYPE);
210  return jfunc->value.known_type.offset;
211}
212
213/* Return the base type of a known type jump function JFUNC.  */
214
215static inline tree
216ipa_get_jf_known_type_base_type (struct ipa_jump_func *jfunc)
217{
218  gcc_checking_assert (jfunc->type == IPA_JF_KNOWN_TYPE);
219  return jfunc->value.known_type.base_type;
220}
221
222/* Return the component type of a known type jump function JFUNC.  */
223
224static inline tree
225ipa_get_jf_known_type_component_type (struct ipa_jump_func *jfunc)
226{
227  gcc_checking_assert (jfunc->type == IPA_JF_KNOWN_TYPE);
228  return jfunc->value.known_type.component_type;
229}
230
231/* Return the constant stored in a constant jump functin JFUNC.  */
232
233static inline tree
234ipa_get_jf_constant (struct ipa_jump_func *jfunc)
235{
236  gcc_checking_assert (jfunc->type == IPA_JF_CONST);
237  return jfunc->value.constant.value;
238}
239
240static inline struct ipa_cst_ref_desc *
241ipa_get_jf_constant_rdesc (struct ipa_jump_func *jfunc)
242{
243  gcc_checking_assert (jfunc->type == IPA_JF_CONST);
244  return jfunc->value.constant.rdesc;
245}
246
247/* Return the operand of a pass through jmp function JFUNC.  */
248
249static inline tree
250ipa_get_jf_pass_through_operand (struct ipa_jump_func *jfunc)
251{
252  gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
253  return jfunc->value.pass_through.operand;
254}
255
256/* Return the number of the caller's formal parameter that a pass through jump
257   function JFUNC refers to.  */
258
259static inline int
260ipa_get_jf_pass_through_formal_id (struct ipa_jump_func *jfunc)
261{
262  gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
263  return jfunc->value.pass_through.formal_id;
264}
265
266/* Return operation of a pass through jump function JFUNC.  */
267
268static inline enum tree_code
269ipa_get_jf_pass_through_operation (struct ipa_jump_func *jfunc)
270{
271  gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
272  return jfunc->value.pass_through.operation;
273}
274
275/* Return the agg_preserved flag of a pass through jump function JFUNC.  */
276
277static inline bool
278ipa_get_jf_pass_through_agg_preserved (struct ipa_jump_func *jfunc)
279{
280  gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
281  return jfunc->value.pass_through.agg_preserved;
282}
283
284/* Return the type_preserved flag of a pass through jump function JFUNC.  */
285
286static inline bool
287ipa_get_jf_pass_through_type_preserved (struct ipa_jump_func *jfunc)
288{
289  gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
290  return jfunc->value.pass_through.type_preserved;
291}
292
293/* Return the offset of an ancestor jump function JFUNC.  */
294
295static inline HOST_WIDE_INT
296ipa_get_jf_ancestor_offset (struct ipa_jump_func *jfunc)
297{
298  gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
299  return jfunc->value.ancestor.offset;
300}
301
302/* Return the result type of an ancestor jump function JFUNC.  */
303
304static inline tree
305ipa_get_jf_ancestor_type (struct ipa_jump_func *jfunc)
306{
307  gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
308  return jfunc->value.ancestor.type;
309}
310
311/* Return the number of the caller's formal parameter that an ancestor jump
312   function JFUNC refers to.  */
313
314static inline int
315ipa_get_jf_ancestor_formal_id (struct ipa_jump_func *jfunc)
316{
317  gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
318  return jfunc->value.ancestor.formal_id;
319}
320
321/* Return the agg_preserved flag of an ancestor jump function JFUNC.  */
322
323static inline bool
324ipa_get_jf_ancestor_agg_preserved (struct ipa_jump_func *jfunc)
325{
326  gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
327  return jfunc->value.ancestor.agg_preserved;
328}
329
330/* Return the type_preserved flag of an ancestor jump function JFUNC.  */
331
332static inline bool
333ipa_get_jf_ancestor_type_preserved (struct ipa_jump_func *jfunc)
334{
335  gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
336  return jfunc->value.ancestor.type_preserved;
337}
338
339/* Summary describing a single formal parameter.  */
340
341struct ipa_param_descriptor
342{
343  /* PARAM_DECL of this parameter.  */
344  tree decl;
345  /* If all uses of the parameter are described by ipa-prop structures, this
346     says how many there are.  If any use could not be described by means of
347     ipa-prop structures, this is IPA_UNDESCRIBED_USE.  */
348  int controlled_uses;
349  unsigned int move_cost : 31;
350  /* The parameter is used.  */
351  unsigned used : 1;
352};
353
354struct 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
360struct ipa_node_params
361{
362  /* Information about individual formal parameters that are gathered when
363     summaries are generated. */
364  vec<ipa_param_descriptor> 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
393static inline int
394ipa_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
403static inline tree
404ipa_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
413static inline int
414ipa_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
422static inline void
423ipa_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.  */
431static inline int
432ipa_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
439static inline void
440ipa_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
448static inline bool
449ipa_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).  */
456struct 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
470typedef struct ipa_agg_replacement_value *ipa_agg_replacement_value_p;
471
472void 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.  */
477struct GTY(()) ipa_edge_args
478{
479  /* Vector of the callsite's jump function of each parameter.  */
480  vec<ipa_jump_func, va_gc> *jump_functions;
481};
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
488static inline int
489ipa_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
498static inline struct ipa_jump_func *
499ipa_get_ith_jump_func (struct ipa_edge_args *args, int i)
500{
501  return &(*args->jump_functions)[i];
502}
503
504/* Types of vectors holding the infos.  */
505
506/* Vector where the parameter infos are actually stored. */
507extern vec<ipa_node_params> ipa_node_params_vector;
508/* Vector of known aggregate values in cloned nodes.  */
509extern GTY(()) vec<ipa_agg_replacement_value_p, va_gc> *ipa_node_agg_replacements;
510/* Vector where the parameter infos are actually stored. */
511extern GTY(()) vec<ipa_edge_args, va_gc> *ipa_edge_args_vector;
512
513/* Return the associated parameter/argument info corresponding to the given
514   node/edge.  */
515#define IPA_NODE_REF(NODE) (&ipa_node_params_vector[(NODE)->uid])
516#define IPA_EDGE_REF(EDGE) (&(*ipa_edge_args_vector)[(EDGE)->uid])
517/* This macro checks validity of index returned by
518   ipa_get_param_decl_index function.  */
519#define IS_VALID_JUMP_FUNC_INDEX(I) ((I) != -1)
520
521/* Creating and freeing ipa_node_params and ipa_edge_args.  */
522void ipa_create_all_node_params (void);
523void ipa_create_all_edge_args (void);
524void ipa_free_edge_args_substructures (struct ipa_edge_args *);
525void ipa_free_node_params_substructures (struct ipa_node_params *);
526void ipa_free_all_node_params (void);
527void ipa_free_all_edge_args (void);
528void ipa_free_all_structures_after_ipa_cp (void);
529void ipa_free_all_structures_after_iinln (void);
530void ipa_register_cgraph_hooks (void);
531
532/* This function ensures the array of node param infos is big enough to
533   accommodate a structure for all nodes and reallocates it if not.  */
534
535static inline void
536ipa_check_create_node_params (void)
537{
538  if (!ipa_node_params_vector.exists ())
539    ipa_node_params_vector.create (cgraph_max_uid);
540
541  if (ipa_node_params_vector.length () <= (unsigned) cgraph_max_uid)
542    ipa_node_params_vector.safe_grow_cleared (cgraph_max_uid + 1);
543}
544
545/* This function ensures the array of edge arguments infos is big enough to
546   accommodate a structure for all edges and reallocates it if not.  */
547
548static inline void
549ipa_check_create_edge_args (void)
550{
551  if (vec_safe_length (ipa_edge_args_vector) <= (unsigned) cgraph_edge_max_uid)
552    vec_safe_grow_cleared (ipa_edge_args_vector, cgraph_edge_max_uid + 1);
553}
554
555/* Returns true if the array of edge infos is large enough to accommodate an
556   info for EDGE.  The main purpose of this function is that debug dumping
557   function can check info availability without causing reallocations.  */
558
559static inline bool
560ipa_edge_args_info_available_for_edge_p (struct cgraph_edge *edge)
561{
562  return ((unsigned) edge->uid < vec_safe_length (ipa_edge_args_vector));
563}
564
565/* Return the aggregate replacements for NODE, if there are any.  */
566
567static inline struct ipa_agg_replacement_value *
568ipa_get_agg_replacements_for_node (struct cgraph_node *node)
569{
570  if ((unsigned) node->uid >= vec_safe_length (ipa_node_agg_replacements))
571    return NULL;
572  return (*ipa_node_agg_replacements)[node->uid];
573}
574
575/* Function formal parameters related computations.  */
576void ipa_initialize_node_params (struct cgraph_node *node);
577bool ipa_propagate_indirect_call_infos (struct cgraph_edge *cs,
578                                        vec<cgraph_edge_p> *new_edges);
579
580/* Indirect edge and binfo processing.  */
581tree ipa_get_indirect_edge_target (struct cgraph_edge *ie,
582                                   vec<tree> ,
583                                   vec<tree> ,
584                                   vec<ipa_agg_jump_function_p> );
585struct cgraph_edge *ipa_make_edge_direct_to_target (struct cgraph_edge *, tree);
586tree ipa_binfo_from_known_type_jfunc (struct ipa_jump_func *);
587tree ipa_intraprocedural_devirtualization (gimple);
588tree ipa_impossible_devirt_target (struct cgraph_edge *, tree);
589
590/* Functions related to both.  */
591void ipa_analyze_node (struct cgraph_node *);
592
593/* Aggregate jump function related functions.  */
594tree ipa_find_agg_cst_for_param (struct ipa_agg_jump_function *, HOST_WIDE_INT,
595                                 bool);
596bool ipa_load_from_parm_agg (struct ipa_node_params *, gimple, tree, int *,
597                             HOST_WIDE_INT *, bool *);
598
599/* Debugging interface.  */
600void ipa_print_node_params (FILE *, struct cgraph_node *node);
601void ipa_print_all_params (FILE *);
602void ipa_print_node_jump_functions (FILE *f, struct cgraph_node *node);
603void ipa_print_all_jump_functions (FILE * f);
604void ipcp_verify_propagated_values (void);
605
606extern alloc_pool ipcp_values_pool;
607extern alloc_pool ipcp_sources_pool;
608extern alloc_pool ipcp_agg_lattice_pool;
609
610/* Operation to be performed for the parameter in ipa_parm_adjustment
611   below.  */
612enum ipa_parm_op {
613  IPA_PARM_OP_NONE,
614
615  /* This describes a brand new parameter.
616
617     The field `type' should be set to the new type, `arg_prefix'
618     should be set to the string prefix for the new DECL_NAME, and
619     `new_decl' will ultimately hold the newly created argument.  */
620  IPA_PARM_OP_NEW,
621
622  /* This new parameter is an unmodified parameter at index base_index. */
623  IPA_PARM_OP_COPY,
624
625  /* This adjustment describes a parameter that is about to be removed
626     completely.  Most users will probably need to book keep those so that they
627     don't leave behinfd any non default def ssa names belonging to them.  */
628  IPA_PARM_OP_REMOVE
629};
630
631/* Structure to describe transformations of formal parameters and actual
632   arguments.  Each instance describes one new parameter and they are meant to
633   be stored in a vector.  Additionally, most users will probably want to store
634   adjustments about parameters that are being removed altogether so that SSA
635   names belonging to them can be replaced by SSA names of an artificial
636   variable.  */
637struct ipa_parm_adjustment
638{
639  /* The original PARM_DECL itself, helpful for processing of the body of the
640     function itself.  Intended for traversing function bodies.
641     ipa_modify_formal_parameters, ipa_modify_call_arguments and
642     ipa_combine_adjustments ignore this and use base_index.
643     ipa_modify_formal_parameters actually sets this.  */
644  tree base;
645
646  /* Type of the new parameter.  However, if by_ref is true, the real type will
647     be a pointer to this type.  */
648  tree type;
649
650  /* Alias refrerence type to be used in MEM_REFs when adjusting caller
651     arguments.  */
652  tree alias_ptr_type;
653
654  /* The new declaration when creating/replacing a parameter.  Created
655     by ipa_modify_formal_parameters, useful for functions modifying
656     the body accordingly.  For brand new arguments, this is the newly
657     created argument.  */
658  tree new_decl;
659
660  /* New declaration of a substitute variable that we may use to replace all
661     non-default-def ssa names when a parm decl is going away.  */
662  tree new_ssa_base;
663
664  /* If non-NULL and the original parameter is to be removed (copy_param below
665     is NULL), this is going to be its nonlocalized vars value.  */
666  tree nonlocal_value;
667
668  /* This holds the prefix to be used for the new DECL_NAME.  */
669  const char *arg_prefix;
670
671  /* Offset into the original parameter (for the cases when the new parameter
672     is a component of an original one).  */
673  HOST_WIDE_INT offset;
674
675  /* Zero based index of the original parameter this one is based on.  */
676  int base_index;
677
678  /* Whether this parameter is a new parameter, a copy of an old one,
679     or one about to be removed.  */
680  enum ipa_parm_op op;
681
682  /* The parameter is to be passed by reference.  */
683  unsigned by_ref : 1;
684};
685
686typedef vec<ipa_parm_adjustment> ipa_parm_adjustment_vec;
687
688vec<tree> ipa_get_vector_of_formal_parms (tree fndecl);
689vec<tree> ipa_get_vector_of_formal_parm_types (tree fntype);
690void ipa_modify_formal_parameters (tree fndecl, ipa_parm_adjustment_vec);
691void ipa_modify_call_arguments (struct cgraph_edge *, gimple,
692                                ipa_parm_adjustment_vec);
693ipa_parm_adjustment_vec ipa_combine_adjustments (ipa_parm_adjustment_vec,
694                                                 ipa_parm_adjustment_vec);
695void ipa_dump_param_adjustments (FILE *, ipa_parm_adjustment_vec, tree);
696void ipa_dump_agg_replacement_values (FILE *f,
697                                      struct ipa_agg_replacement_value *av);
698void ipa_prop_write_jump_functions (void);
699void ipa_prop_read_jump_functions (void);
700void ipa_prop_write_all_agg_replacement (void);
701void ipa_prop_read_all_agg_replacement (void);
702void ipa_update_after_lto_read (void);
703int ipa_get_param_decl_index (struct ipa_node_params *, tree);
704tree ipa_value_from_jfunc (struct ipa_node_params *info,
705                           struct ipa_jump_func *jfunc);
706unsigned int ipcp_transform_function (struct cgraph_node *node);
707void ipa_dump_param (FILE *, struct ipa_node_params *info, int i);
708bool ipa_modify_expr (tree *, bool, ipa_parm_adjustment_vec);
709ipa_parm_adjustment *ipa_get_adjustment_candidate (tree **, bool *,
710                                                   ipa_parm_adjustment_vec,
711                                                   bool);
712
713
714/* From tree-sra.c:  */
715tree build_ref_for_offset (location_t, tree, HOST_WIDE_INT, tree,
716                           gimple_stmt_iterator *, bool);
717
718#endif /* IPA_PROP_H */
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