2 * Copyright (C) 1998 - 2000 by Universitaet Karlsruhe
10 * Entities represent all program known objects.
12 * @author Martin Trapp, Christian Schaefer
13 * @author Goetz Lindenmaier
15 * An entity is the representation of program known objects in Firm.
16 * The primary concept of entities is to represent members of complex
17 * types, i.e., fields and methods of classes. As not all programming
18 * language model all variables and methods as members of some class,
19 * the concept of entities is extended to cover also local and global
20 * variables, and arbitrary procedures.
22 * An entity always specifies the type of the object it represents and
23 * the type of the object it is a part of, the owner of the entity.
24 * Originally this is the type of the class of which the entity is a
26 * The owner of local variables is the procedure they are defined in.
27 * The owner of global variables and procedures visible in the whole
28 * program is a universally defined class type "GlobalType". The owner
29 * of procedures defined in the scope of an other procedure is the
30 * enclosing procedure.
32 * In detail the datastructure entity has the following fields:
34 * - ident *name: Name of this entity as specified in the source code.
35 * Only unequivocal in conjuction with scope.
36 * - ident *ld_name: Unique name of this entity, i.e., the mangled
37 * name. E.g., for a class `A' with field `a' this
38 * is the ident for `A_a'.
39 * - type *type: The type of this entity, e.g., a method type, a
40 * basic type of the language or a class itself.
41 * - type *owner: The class this entity belongs to. In case of local
42 * variables the method they are defined in.
43 * - int offset: Offset in byte for this entity. Fixed when layout
44 * of owner is determined.
45 * - ir_graph *irg: If (type == method_type) this is the corresponding irg.
46 * The ir_graph constructor automatically sets this field.
47 * If (type != method_type) access of this field will cause
60 /*-----------------------------------------------------------------*/
62 /*-----------------------------------------------------------------*/
64 /** Initalize entity module. */
65 void init_entity (void);
67 /*-----------------------------------------------------------------*/
69 /*-----------------------------------------------------------------*/
71 /* to resolve recursion between entity.h and irgraph.h */
72 #ifndef _IR_GRAPH_TYPEDEF_
73 #define _IR_GRAPH_TYPEDEF_
74 typedef struct ir_graph ir_graph;
79 * An abstract data type to represent program entites.
81 * @param owner A compound type this entity is a part of.
82 * @param type The type of this entity.
83 * @param name The string that represents this entity in the source program.
84 * @param allocation A flag saying whether the entity is dynamically or statically
85 * allocated (values: dynamic_allocated, static_allocated,
86 * automatic_allocated).
87 * @param visibility A flag indicating the visibility of this entity (values: local,
88 * external_visible, external_allocated)
89 * @param variability A flag indicating the variability of this entity (values:
90 * uninitialized, initalized, part_constant, constant)
91 * @param volatility @@@
92 * @param offset The offset of the entity within the compound object. Only set
93 * if the owner in the state "layout_fixed".
94 * @param overwrites A list of entities overwritten by this entity. This list is only
95 * existent if the owner of this entity is a class. The members in
96 * this list must be entities of super classes.
97 * @param overwrittenby A list of entities that overwrite this entity. This list is only
98 * existent if the owner of this entity is a class. The members in
99 * this list must be entities of sub classes.
100 * @param link A void* to associate some additional information with the entity.
101 * @param irg If the entity is a method this is the ir graph that represents the
102 * code of the method.
103 * @param peculiarity The peculiarity of the entity. If the entity is a method this
104 * indicates whether the entity represents
105 * a real method or whether it only exists to describe an interface.
106 * In that case there nowhere exists code for this entity and this entity
107 * is never dynamically used in the code.
108 * Values: description, existent. Default: existent.
109 * @param visited visited flag. Master flag is type_visited.
111 * @param These fields can only be accessed via access functions.
116 /* to resolve recursion between entity.h and type.h */
117 /** the type of an entity */
118 #ifndef _ENTITY_TYPEDEF_
119 #define _ENTITY_TYPEDEF_
120 typedef struct entity entity;
124 * Creates a new entity.
126 * Automatically inserts the entity as a member of owner.
127 * Entity is automatic_allocated and uninitialize except if the type
128 * is type_method, then it is static_allocated and constant. The constant
129 * value is a pointer to the method.
130 * Visibility is local, offset -1, and it is not volatile.
132 entity *new_entity (type *owner, ident *name, type *tp);
135 * Creates a new entity.
137 * Automatically inserts the entity as a member of owner.
138 * Entity is automatic_allocated and uninitialize except if the type
139 * is type_method, then it is static_allocated and constant. The constant
140 * value is a pointer to the method.
141 * Visibility is local, offset -1, and it is not volatile.
143 entity *new_d_entity (type *owner, ident *name, type *tp, dbg_info *db);
146 * Copies the entity if the new_owner is different from the
147 * owner of the old entity, else returns the old entity.
149 * Automatically inserts the new entity as a member of owner.
150 * Resets the overwrites/overwritten_by fields.
152 entity *copy_entity_own (entity *old, type *new_owner);
155 * Copies the entity if the new_name is different from the
156 * name of the old entity, else returns the old entity.
158 * Automatically inserts the new entity as a member of owner.
159 * The mangled name ld_name is set to NULL.
161 entity *copy_entity_name (entity *old, ident *new_name);
166 * The owner will still contain the pointer to this
167 * entity, as well as all other references!
169 void free_entity (entity *ent);
171 /** Returns the name of an entity. */
172 const char *get_entity_name (entity *ent);
174 /** Returns the ident of an entity. */
175 ident *get_entity_ident (entity *ent);
177 /** Returns the mangled name of the entity.
179 * If the mangled name is set it returns the existing name.
180 * Else it generates a name with mangle_entity()
181 * and remembers this new name internally.
183 ident *get_entity_ld_ident (entity *ent);
185 /** Sets the mangled name of the entity. */
186 void set_entity_ld_ident (entity *ent, ident *ld_ident);
188 /** Returns the mangled name of the entity as a string. */
189 const char *get_entity_ld_name (entity *end);
191 /** Returns the owner of the entity. */
192 type *get_entity_owner (entity *ent);
194 /** Sets the owner field in entity to owner. Don't forget to add
196 void set_entity_owner (entity *ent, type *owner);
198 /** Asserts if the type owner is neither a compound type or an array */
199 INLINE void assert_legal_owner_of_ent(type *owner);
201 /** Returns the type of an entity. */
202 type *get_entity_type (entity *ent);
204 /** Sets the type of an entity. */
205 void set_entity_type (entity *ent, type *tp);
207 /** The allocation type. */
209 automatic_allocated, /**< The entity is allocated during runtime, implicitly
210 as component of a compound type. This is the default. */
211 parameter_allocated, /**< The entity is a parameter. It is also automatic allocated.
212 We distinguish the allocation of paramters from the allocation
213 of local variables as their placement depends on the calling
215 dynamic_allocated, /**< The entity is allocated during runtime, explicitly
217 static_allocated /**< The entity is allocated statically. We can use a
218 SymConst(?) as address of the entity. */
221 /** Returns the allocation type of an entity. */
222 ent_allocation get_entity_allocation (entity *ent);
224 /** Sets the allocation type of an entity. */
225 void set_entity_allocation (entity *ent, ent_allocation al);
228 * This enumeration flags the visibility of entities. This is necessary
229 * for partial compilation.
232 local, /**< The entity is only visible locally. This is the default. */
233 external_visible, /**< The entity is visible to other external program parts, but
234 it is defined here. It may not be optimized away. The entity must
235 be static_allocated. */
236 external_allocated /**< The entity is defined and allocated externally. This compilation
237 must not allocate memory for this entity. The entity must
238 be static_allocated. This can also be an external defined
242 /** Returns the visibility of an entity. */
243 ent_visibility get_entity_visibility (entity *ent);
245 /** Sets the visibility of an entity. */
246 void set_entity_visibility (entity *ent, ent_visibility vis);
248 /** This enumeration flags the variability of entities. */
250 uninitialized, /**< The content of the entity is completely unknown. */
251 initialized, /**< After allocation the entity is initalized with the
252 value given somewhere in the entity. */
253 part_constant, /**< For entities of compound types. Some members of the entity
254 are constant. The others are uninitialized. Those members
255 given a value for are constant. */
256 constant /**< The entity is constant. */
259 /** Returns the variability of an entity. */
260 ent_variability get_entity_variability (entity *ent);
262 /** Sets the variability of an entity. */
263 void set_entity_variability (entity *ent, ent_variability var);
265 /** This enumeration flags the volatility of entities. */
267 non_volatile, /**< The entity is not volatile */
268 is_volatile /**< The entity is volatile */
271 /** Returns the volatility of an entity. */
272 ent_volatility get_entity_volatility (entity *ent);
274 /** Sets the volatility of an entity. */
275 void set_entity_volatility (entity *ent, ent_volatility vol);
277 /** Returns the offset of an entity (in a compound). Only set if layout = fixed. */
278 int get_entity_offset (entity *ent);
280 /** Sets the offset of an entity (in a compound). */
281 void set_entity_offset (entity *ent, int offset);
283 /** Returns the stored intermediate information. */
284 void* get_entity_link(entity *ent);
286 /** Stores new intermediate information. */
287 void set_entity_link(entity *ent, void *l);
289 /* -- Fields of method entities -- */
290 /* The entity knows the corresponding irg if the entity is a method.
291 This allows to get from a Call to the called irg.
292 Only entities of peculiarity "existent" can have a corresponding irg,
293 else the field is fixed to NULL. (Get returns NULL, set asserts.) */
294 ir_graph *get_entity_irg(entity *ent);
295 void set_entity_irg(entity *ent, ir_graph *irg);
297 /* For the definition of enumeration peculiarity see type.h */
298 peculiarity get_entity_peculiarity (entity *ent);
299 void set_entity_peculiarity (entity *ent, peculiarity pec);
301 /* -- Representation of constant values of entites -- */
302 /* Set current_ir_graph to get_const_code_irg() to generate a constant
304 /* Copies a firm subgraph that complies to the restrictions for
305 constant expressions to current_block in current_ir_graph. */
306 ir_node *copy_const_value(ir_node *n);
308 /* Set has no effect for entities of type method. */
309 ir_node *get_atomic_ent_value(entity *ent);
310 void set_atomic_ent_value(entity *ent, ir_node *val);
312 /* A value of a compound entity is a pair of a value and the corresponding
313 member of the compound. */
314 void add_compound_ent_value(entity *ent, ir_node *val, entity *member);
315 int get_compound_ent_n_values(entity *ent);
316 ir_node *get_compound_ent_value(entity *ent, int pos);
317 entity *get_compound_ent_value_member(entity *ent, int pos);
318 void set_compound_ent_value(entity *ent, ir_node *val, entity *member, int pos);
319 void remove_compound_ent_value(entity *ent, entity *value_ent);
321 /** Inits the entity ent witch must be of a one dimensional
322 array type with the values given in the values array.
323 The array must have a lower and an upper bound. Keeps the
324 order of values. Does not test whether the number of values
325 fits into the given array size. Does not test whether the
326 values have the proper mode for the array. */
327 void set_array_entity_values(entity *ent, tarval **values, int num_vals);
329 /* --- Fields of entities with a class type as owner --- */
330 /* Overwrites is a field that specifies that an access to the overwritten
331 entity in the supertype must use this entity. It's a list as with
332 multiple inheritance several enitites can be overwritten. This field
333 is mostly useful for method entities.
334 If a Sel node selects an entity that is overwritten by other entities it
335 must return a pointer to the entity of the dynamic type of the pointer
336 that is passed to it. Lowering of the Sel node must assure this.
337 Overwrittenby is the inverse of overwrites. Both add routines add
338 both relations, they only differ in the order of arguments. */
339 void add_entity_overwrites (entity *ent, entity *overwritten);
340 int get_entity_n_overwrites (entity *ent);
341 int get_entity_overwrites_index(entity *ent, entity *overwritten);
342 entity *get_entity_overwrites (entity *ent, int pos);
343 void set_entity_overwrites (entity *ent, int pos, entity *overwritten);
344 void remove_entity_overwrites(entity *ent, entity *overwritten);
346 void add_entity_overwrittenby (entity *ent, entity *overwrites);
347 int get_entity_n_overwrittenby (entity *ent);
348 int get_entity_overwrittenby_index(entity *ent, entity *overwrites);
349 entity *get_entity_overwrittenby (entity *ent, int pos);
350 void set_entity_overwrittenby (entity *ent, int pos, entity *overwrites);
351 void remove_entity_overwrittenby(entity *ent, entity *overwrites);
354 * Checks whether a pointer points to an entity.
356 * @param thing an arbitrary pointer
359 * true if the thing is an entity, else false
361 int is_entity (void *thing);
363 /** Returns true if the type of the entity is a primitive, pointer
364 enumeration or method type. */
365 int is_atomic_entity(entity *ent);
366 /** Returns true if the type of the entity is a class, structure,
367 array or union type. */
368 int is_compound_entity(entity *ent);
370 /** Returns true if ent1 and ent2 have are equal except for their owner.
371 Two entities are equal if
372 - they have the same type (the same C-struct)
375 bool equal_entity(entity *ent1, entity *ent2);
378 /** Outputs a unique number for this entity if libfirm is compiled for
379 debugging, (configure with --enable-debug) else returns 0. */
380 INLINE long get_entity_nr(entity *ent);
382 /** Returns the entitys visited count. */
383 unsigned long get_entity_visited(entity *ent);
385 /** Sets the entitys visited count. */
386 void set_entity_visited(entity *ent, unsigned long num);
388 /** Sets visited field in entity to entity_visited. */
389 void mark_entity_visited(entity *ent);
391 /** Returns true if this entity was visited. */
392 bool entity_visited(entity *ent);
394 /** Returns true if this entity was not visited. */
395 bool entity_not_visited(entity *ent);
398 # endif /* _ENTITY_H_ */