3 * File name: ir/tr/entity.h
4 * Purpose: Representation of all program known entities.
5 * Author: Martin Trapp, Christian Schaefer
6 * Modified by: Goetz Lindenmaier
9 * Copyright: (c) 1998-2003 Universität Karlsruhe
10 * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
16 * Entities represent all program known objects.
18 * @author Martin Trapp, Christian Schaefer
19 * @author Goetz Lindenmaier
21 * An entity is the representation of program known objects in Firm.
22 * The primary concept of entities is to represent members of complex
23 * types, i.e., fields and methods of classes. As not all programming
24 * language model all variables and methods as members of some class,
25 * the concept of entities is extended to cover also local and global
26 * variables, and arbitrary procedures.
28 * An entity always specifies the type of the object it represents and
29 * the type of the object it is a part of, the owner of the entity.
30 * Originally this is the type of the class of which the entity is a
32 * The owner of local variables is the procedure they are defined in.
33 * The owner of global variables and procedures visible in the whole
34 * program is a universally defined class type "GlobalType". The owner
35 * of procedures defined in the scope of an other procedure is the
36 * enclosing procedure.
38 * In detail the datastructure entity has the following fields:
40 * - ident *name: Name of this entity as specified in the source code.
41 * Only unequivocal in conjuction with scope.
42 * - ident *ld_name: Unique name of this entity, i.e., the mangled
43 * name. E.g., for a class `A' with field `a' this
44 * is the ident for `A_a'.
45 * - type *type: The type of this entity, e.g., a method type, a
46 * basic type of the language or a class itself.
47 * - type *owner: The class this entity belongs to. In case of local
48 * variables the method they are defined in.
49 * - int offset: Offset in bits for this entity. Fixed when layout
50 * of owner is determined.
51 * - ir_graph *irg: If (type == method_type) this is the corresponding irg.
52 * The ir_graph constructor automatically sets this field.
53 * If (type != method_type) access of this field will cause
64 # include "tr_inheritance.h"
66 /*-----------------------------------------------------------------*/
68 /*-----------------------------------------------------------------*/
70 /** Initalize entity module. */
71 void init_entity (void);
73 /*-----------------------------------------------------------------*/
75 /*-----------------------------------------------------------------*/
77 /* to resolve recursion between entity.h and irgraph.h */
78 #ifndef _IR_GRAPH_TYPEDEF_
79 #define _IR_GRAPH_TYPEDEF_
80 typedef struct ir_graph ir_graph;
85 * An abstract data type to represent program entites.
87 * @param owner A compound type this entity is a part of.
88 * @param type The type of this entity.
89 * @param name The string that represents this entity in the source program.
90 * @param allocation A flag saying whether the entity is dynamically or statically
91 * allocated (values: dynamic_allocated, static_allocated,
92 * automatic_allocated).
93 * @param visibility A flag indicating the visibility of this entity (values: local,
94 * external_visible, external_allocated)
95 * @param variability A flag indicating the variability of this entity (values:
96 * uninitialized, initalized, part_constant, constant)
97 * @param volatility @@@
98 * @param offset The offset of the entity within the compound object in bits. Only set
99 * if the owner in the state "layout_fixed".
100 * @param overwrites A list of entities overwritten by this entity. This list is only
101 * existent if the owner of this entity is a class. The members in
102 * this list must be entities of super classes.
103 * @param overwrittenby A list of entities that overwrite this entity. This list is only
104 * existent if the owner of this entity is a class. The members in
105 * this list must be entities of sub classes.
106 * @param link A void* to associate some additional information with the entity.
107 * @param irg If the entity is a method this is the ir graph that represents the
108 * code of the method.
109 * @param peculiarity The peculiarity of the entity. If the entity is a method this
110 * indicates whether the entity represents
111 * a real method or whether it only exists to describe an interface.
112 * In that case there nowhere exists code for this entity and this entity
113 * is never dynamically used in the code.
114 * Values: description, existent. Default: existent.
115 * @param visited visited flag. Master flag is type_visited.
117 * @param These fields can only be accessed via access functions.
122 /* to resolve recursion between entity.h and type.h */
123 /** the type of an entity */
124 #ifndef _ENTITY_TYPEDEF_
125 #define _ENTITY_TYPEDEF_
126 typedef struct entity entity;
130 * Creates a new entity.
132 * Automatically inserts the entity as a member of owner.
133 * Entity is automatic_allocated and uninitialize except if the type
134 * is type_method, then it is static_allocated and constant. The constant
135 * value is a pointer to the method.
136 * Visibility is local, offset -1, and it is not volatile.
138 entity *new_entity (type *owner, ident *name, type *tp);
141 * Creates a new entity.
143 * Automatically inserts the entity as a member of owner.
144 * Entity is automatic_allocated and uninitialize except if the type
145 * is type_method, then it is static_allocated and constant. The constant
146 * value is a pointer to the method.
147 * Visibility is local, offset -1, and it is not volatile.
149 entity *new_d_entity (type *owner, ident *name, type *tp, dbg_info *db);
152 * Copies the entity if the new_owner is different from the
153 * owner of the old entity, else returns the old entity.
155 * Automatically inserts the new entity as a member of owner.
156 * Resets the overwrites/overwritten_by fields.
158 entity *copy_entity_own (entity *old, type *new_owner);
161 * Copies the entity if the new_name is different from the
162 * name of the old entity, else returns the old entity.
164 * Automatically inserts the new entity as a member of owner.
165 * The mangled name ld_name is set to NULL.
167 entity *copy_entity_name (entity *old, ident *new_name);
172 * The owner will still contain the pointer to this
173 * entity, as well as all other references!
175 void free_entity (entity *ent);
177 /** Returns the name of an entity. */
178 const char *get_entity_name (const entity *ent);
180 /** Returns the ident of an entity. */
181 ident *get_entity_ident (const entity *ent);
183 /** Returns the mangled name of the entity.
185 * If the mangled name is set it returns the existing name.
186 * Else it generates a name with mangle_entity()
187 * and remembers this new name internally.
189 ident *get_entity_ld_ident (entity *ent);
191 /** Sets the mangled name of the entity. */
192 void set_entity_ld_ident (entity *ent, ident *ld_ident);
194 /** Returns the mangled name of the entity as a string. */
195 const char *get_entity_ld_name (entity *ent);
197 /** Returns the owner of the entity. */
198 type *get_entity_owner (entity *ent);
200 /** Sets the owner field in entity to owner. Don't forget to add
202 void set_entity_owner (entity *ent, type *owner);
204 /** Asserts if the type owner is either a compound type or an array */
205 void assert_legal_owner_of_ent(type *owner);
207 /** Returns the type of an entity. */
208 type *get_entity_type (entity *ent);
210 /** Sets the type of an entity. */
211 void set_entity_type (entity *ent, type *tp);
213 /** The allocation type. */
215 allocation_automatic, /**< The entity is allocated during runtime, implicitly
216 as component of a compound type. This is the default. */
217 allocation_parameter, /**< The entity is a parameter. It is also automatic allocated.
218 We distinguish the allocation of parameters from the allocation
219 of local variables as their placement depends on the calling
221 allocation_dynamic, /**< The entity is allocated during runtime, explicitly
223 allocation_static /**< The entity is allocated statically. We can use a
224 Const as address of the entity. */
227 /** Returns the allocation type of an entity. */
228 ent_allocation get_entity_allocation (const entity *ent);
230 /** Sets the allocation type of an entity. */
231 void set_entity_allocation (entity *ent, ent_allocation al);
233 /** Return the name of the allocation type. */
234 const char *get_allocation_name(ent_allocation vis);
237 * This enumeration flags the visibility of entities. This is necessary
238 * for partial compilation.
241 visibility_local, /**< The entity is only visible locally. This is the default. */
242 visibility_external_visible, /**< The entity is visible to other external program parts, but
243 it is defined here. It may not be optimized away. The entity must
244 be static_allocated. */
245 visibility_external_allocated /**< The entity is defined and allocated externally. This compilation
246 must not allocate memory for this entity. The entity must
247 be static_allocated. This can also be an external defined
251 /** Returns the visibility of an entity. */
252 ent_visibility get_entity_visibility (const entity *ent);
254 /** Sets the visibility of an entity. */
255 void set_entity_visibility (entity *ent, ent_visibility vis);
257 /** Return the name of the visibility */
258 const char *get_visibility_name(ent_visibility vis);
260 /** This enumeration flags the variability of entities. */
262 variability_uninitialized, /**< The content of the entity is completely unknown. */
263 variability_initialized, /**< After allocation the entity is initalized with the
264 value given somewhere in the entity. */
265 variability_part_constant, /**< For entities of compound types.
266 The members of the entity are mixed constant,
267 initialized or uninitialized. */
268 variability_constant /**< The entity is constant. */
271 /** Returns the variability of an entity. */
272 ent_variability get_entity_variability (const entity *ent);
274 /** Sets the variability of an entity. */
275 void set_entity_variability (entity *ent, ent_variability var);
277 /** Return the name of the variablity. */
278 const char *get_variability_name(ent_variability var);
280 /** This enumeration flags the volatility of entities. */
282 volatility_non_volatile, /**< The entity is not volatile */
283 volatility_is_volatile /**< The entity is volatile */
286 /** Returns the volatility of an entity. */
287 ent_volatility get_entity_volatility (const entity *ent);
289 /** Sets the volatility of an entity. */
290 void set_entity_volatility (entity *ent, ent_volatility vol);
292 /** Return the name of the volatility. */
293 const char *get_volatility_name(ent_volatility var);
295 /** This enumeration flags the stickyness of an entity. */
297 stickyness_unsticky, /**< The entity can be removed from
298 the program, unless contraindicated
299 by other attributes */
300 stickyness_sticky /**< The entity must remain in the
301 program in any case */
304 /** Get the entity's stickyness */
305 ent_stickyness get_entity_stickyness(const entity *ent);
307 /** Set the entity's stickyness */
308 void set_entity_stickyness(entity *ent, ent_stickyness stickyness);
310 /** Returns the offset of an entity (in a compound) in bytes. Only set if layout = fixed. */
311 int get_entity_offset_bytes(const entity *ent);
313 /** Returns the offset of an entity (in a compound) in bits. Only set if layout = fixed. */
314 int get_entity_offset_bits(const entity *ent);
316 /** Sets the offset of an entity (in a compound) in bytes. */
317 void set_entity_offset_bytes(entity *ent, int offset);
319 /** Sets the offset of an entity (in a compound) in bits. */
320 void set_entity_offset_bits(entity *ent, int offset);
322 /** Returns the stored intermediate information. */
323 void* get_entity_link(const entity *ent);
325 /** Stores new intermediate information. */
326 void set_entity_link(entity *ent, void *l);
328 /* -- Fields of method entities -- */
329 /** The entity knows the corresponding irg if the entity is a method.
330 This allows to get from a Call to the called irg.
331 Only entities of peculiarity "existent" can have a corresponding irg,
332 else the field is fixed to NULL. (Get returns NULL, set asserts.) */
333 ir_graph *get_entity_irg(const entity *ent);
334 void set_entity_irg(entity *ent, ir_graph *irg);
336 /** Return the peculiarity of an entity. */
337 peculiarity get_entity_peculiarity (const entity *ent);
339 /** Sets the peculiarity of an entity. */
340 void set_entity_peculiarity (entity *ent, peculiarity pec);
342 /** Return the name of the peculiarity. */
343 const char *get_peculiarity_name(peculiarity var);
345 /* -- Representation of constant values of entites -- */
346 /** Returns true if the the node is representable as code on
348 int is_irn_const_expression(ir_node *n);
349 /* Set current_ir_graph to get_const_code_irg() to generate a constant
353 * Copies a firm subgraph that complies to the restrictions for
354 * constant expressions to current_block in current_ir_graph.
356 ir_node *copy_const_value(ir_node *n);
358 /* Set has no effect for existent entities of type method. */
359 ir_node *get_atomic_ent_value(entity *ent);
360 void set_atomic_ent_value(entity *ent, ir_node *val);
362 /* The following type describes a path to a leave in the compound graph.
363 Node 0 in the path must be an entity of type tp given in the constructor. If
364 the type of this element is compound, the path node 1 is an element of the type
365 of node 0 an so forth, until an entity of atomic type is reached. */
366 #ifndef _COMPOUND_GRAPH_PATH_TYPEDEF_
367 #define _COMPOUND_GRAPH_PATH_TYPEDEF_
368 typedef struct compound_graph_path compound_graph_path;
369 #endif /* _COMPOUND_GRAPH_PATH_TYPEDEF_ */
370 compound_graph_path *new_compound_graph_path(type *tp, int length);
371 int is_compound_graph_path(void *thing);
372 void free_compound_graph_path (compound_graph_path *gr);
373 int get_compound_graph_path_length(compound_graph_path *gr);
374 entity *get_compound_graph_path_node(compound_graph_path *gr, int pos);
375 void set_compound_graph_path_node(compound_graph_path *gr, int pos, entity *node);
376 int get_compound_graph_path_array_index(compound_graph_path *gr, int pos);
377 void set_compound_graph_path_array_index(compound_graph_path *gr, int pos, int index);
379 /** Checks whether the path up to pos is correct. If the path contains a NULL,
380 * assumes the path is not complete and returns 'true'. */
381 int is_proper_compound_graph_path(compound_graph_path *gr, int pos);
383 /* A value of a compound entity is a pair of a value and the description of the
384 corresponding access path to the member of the compound. */
385 void add_compound_ent_value_w_path(entity *ent, ir_node *val, compound_graph_path *path);
386 void set_compound_ent_value_w_path(entity *ent, ir_node *val, compound_graph_path *path, int pos);
387 /** Returns the number of constant values needed to initialize the entity.
389 * Asserts if the entity has variability_uninitialized.
391 int get_compound_ent_n_values(entity *ent);
392 /** Returns a constant value given the position. */
393 ir_node *get_compound_ent_value(entity *ent, int pos);
394 /** Returns the access path for value at position pos. */
395 compound_graph_path *get_compound_ent_value_path(entity *ent, int pos);
396 /** Returns the position of a value with the given path.
397 * The path must contain array indicees for all array element entities. */
398 int get_compound_ent_pos_by_path(entity *ent, compound_graph_path *path);
399 /** Returns a constant value given the access path.
400 * The path must contain array indicees for all array element entities. */
401 ir_node *get_compound_ent_value_by_path(entity *ent, compound_graph_path *path);
403 /** Removes all constant entries where the path ends at value_ent. Does not
404 free the memory of the paths. (The same path might be used for several
405 constant entities. */
406 void remove_compound_ent_value(entity *ent, entity *value_ent);
408 /* Some languages support only trivial access paths, i.e., the member is a
409 direct, atomic member of the constant entities type. In this case the
410 corresponding entity can be accessed directly. The following functions
411 allow direct access. */
413 /** generates a Path with length 1 */
414 void add_compound_ent_value(entity *ent, ir_node *val, entity *member);
416 /** Returns the last member in the path */
417 entity *get_compound_ent_value_member(entity *ent, int pos);
419 /** Sets the path at pos 0 */
420 void set_compound_ent_value(entity *ent, ir_node *val, entity *member, int pos);
422 /** Inits the entity ent witch must be of a one dimensional
423 array type with the values given in the values array.
424 The array must have a lower and an upper bound. Keeps the
425 order of values. Does not test whether the number of values
426 fits into the given array size. Does not test whether the
427 values have the proper mode for the array. */
428 void set_array_entity_values(entity *ent, tarval **values, int num_vals);
430 /** Return the overall offset of value at position pos in bits.
432 * This requires that the layout of all concerned types is fixed.
434 * @param ent Any entity of compound type with at least pos initialization values.
435 * @param pos The position of the value for which the offset is requested.
437 int get_compound_ent_value_offset_bits(entity *ent, int pos);
439 /** Return the overall offset of value at position pos in bytes.
441 * This requires that the layout of all concerned types is fixed.
442 * Asserts if bit offset is not byte aligned.
444 * @param ent Any entity of compound type with at least pos initialization values.
445 * @param pos The position of the value for which the offset is requested.
447 int get_compound_ent_value_offset_bytes(entity *ent, int pos);
449 /** Compute the array indicees in compound graph paths of initialized entities.
451 * All arrays must have fixed lower and upper bounds. One array can
452 * have an open upper bound. If there are several open bounds, we do
453 * nothing. There must be initializer elements for all array
454 * elements. Uses the link field in the array element entities. The
455 * array bounds must be representable as ints.
457 * @param ent Any entity.
459 void compute_compound_ent_array_indicees(entity *ent);
461 /** Sort the values of the compound entity by their overall offset.
463 * This requires that the layout of all concerned types is fixed.
464 * If the entity has no initialization information the method just
465 * returns. This is needed to dump the entity in a backend.
467 * @param ent Any entity.
469 void sort_compound_ent_values(entity *ent);
472 /* --- Fields of entities with a class type as owner --- */
473 /* Overwrites is a field that specifies that an access to the overwritten
474 entity in the supertype must use this entity. It's a list as with
475 multiple inheritance several enitites can be overwritten. This field
476 is mostly useful for method entities.
477 If a Sel node selects an entity that is overwritten by other entities it
478 must return a pointer to the entity of the dynamic type of the pointer
479 that is passed to it. Lowering of the Sel node must assure this.
480 Overwrittenby is the inverse of overwrites. Both add routines add
481 both relations, they only differ in the order of arguments. */
482 void add_entity_overwrites (entity *ent, entity *overwritten);
483 int get_entity_n_overwrites (entity *ent);
484 int get_entity_overwrites_index(entity *ent, entity *overwritten);
485 entity *get_entity_overwrites (entity *ent, int pos);
486 void set_entity_overwrites (entity *ent, int pos, entity *overwritten);
487 void remove_entity_overwrites(entity *ent, entity *overwritten);
489 void add_entity_overwrittenby (entity *ent, entity *overwrites);
490 int get_entity_n_overwrittenby (entity *ent);
491 int get_entity_overwrittenby_index(entity *ent, entity *overwrites);
492 entity *get_entity_overwrittenby (entity *ent, int pos);
493 void set_entity_overwrittenby (entity *ent, int pos, entity *overwrites);
494 void remove_entity_overwrittenby(entity *ent, entity *overwrites);
497 * Checks whether a pointer points to an entity.
499 * @param thing an arbitrary pointer
502 * true if the thing is an entity, else false
504 int is_entity (const void *thing);
506 /** Returns true if the type of the entity is a primitive, pointer
507 enumeration or method type. */
508 int is_atomic_entity(entity *ent);
509 /** Returns true if the type of the entity is a class, structure,
510 array or union type. */
511 int is_compound_entity(entity *ent);
513 /** Returns true if ent1 and ent2 have are equal except for their owner.
514 Two entities are equal if
515 - they have the same type (the same C-struct)
518 bool equal_entity(entity *ent1, entity *ent2);
520 /** Outputs a unique number for this entity if libfirm is compiled for
521 debugging, (configure with --enable-debug) else returns 0. */
522 long get_entity_nr(entity *ent);
524 /** Returns the entitys visited count. */
525 unsigned long get_entity_visited(entity *ent);
527 /** Sets the entitys visited count. */
528 void set_entity_visited(entity *ent, unsigned long num);
530 /** Sets visited field in entity to entity_visited. */
531 void mark_entity_visited(entity *ent);
533 /** Returns true if this entity was visited. */
534 bool entity_visited(entity *ent);
536 /** Returns true if this entity was not visited. */
537 bool entity_not_visited(entity *ent);
540 * @page unknown_entity
542 * This entity is an auxiliary entity dedicated to support analyses.
544 * The unknown entity represents that there could be an entity, but it is not
545 * known. This entity can be used to initialize fields before an analysis (not known
546 * yet) or to represent the top of a lattice (could not be determined). There exists
547 * exactly one entity unknown. This entity has as owner and as type the unknown type. It is
548 * allocated when initializing the entity module.
550 * The entity can take the role of any entity, also methods. It returns default
551 * values in these cases.
553 * The following values are set:
554 * name = "unknown_entity"
555 * ld_name = "unknown_entity"
556 * owner = unknown_type
557 * type = unknown_type
558 * visibility = visibility_external_allocated
560 * variability = variability_uninitialized
561 * value = SymConst(unknown_entity)
564 * peculiarity = peculiarity_existent
565 * volatility = volatility_non_volatile
566 * stickyness = stickyness_unsticky
569 * overwrittenby = NULL
574 /* A variable that contains the only unknown entity. */
575 extern entity *unknown_entity;
576 /* Returns the unknown entity */
577 entity *get_unknown_entity(void);
579 # endif /* _ENTITY_H_ */