2 ** Copyright (C) 1998 - 2000 by Universitaet Karlsruhe
3 ** All rights reserved.
5 ** Authors: Martin Trapp, Christian Schaefer,
8 ** entity.h: entities represent all program known objects.
10 ** An entity is the representation of program known objects in Firm.
11 ** The primary concept of entities is to represent members of complex
12 ** types, i.e., fields and methods of classes. As not all programming
13 ** language model all variables and methods as members of some class,
14 ** the concept of entities is extended to cover also local and global
15 ** variables, and arbitrary procedures.
17 ** An entity always specifies the type of the object it represents and
18 ** the type of the object it is a part of, the owner of the entity.
19 ** Originally this is the type of the class of which the entity is a
21 ** The owner of local variables is the procedure they are defined in.
22 ** The owner of global variables and procedures visible in the whole
23 ** program is a universally defined class type "GlobalType". The owner
24 ** of procedures defined in the scope of an other procedure is the
25 ** enclosing procedure.
27 ** In detail the datastructure entity has the following fields:
29 ** ident *name Name of this entity as specified in the source code.
30 ** Only unequivocal in conjuction with scope.
31 ** ident *ld_name Unique name of this entity, i.e., the mangled
32 ** name. E.g., for a class `A' with field `a' this
33 ** is the ident for `A_a'.
34 ** type *type The type of this entity, e.g., a method type, a
35 ** basic type of the language or a class itself.
36 ** type *owner; The class this entity belongs to. In case of local
37 ** variables the method they are defined in.
38 ** int offset; Offset in byte for this entity. Fixed when layout
39 ** of owner is determined.
40 ** ir_graph *irg; If (type == method_type) this is the corresponding irg.
41 ** The ir_graph constructor automatically sets this field.
42 ** If (type !- method_type) access of this field will cause
54 /*******************************************************************/
56 /*******************************************************************/
58 /* initalize entity module */
59 void init_entity (void);
61 /*******************************************************************/
63 /*******************************************************************/
65 #ifndef _IR_GRAPH_TYPEDEF_
66 #define _IR_GRAPH_TYPEDEF_
67 /* to resolve recursion between entity.h and irgraph.h */
68 typedef struct ir_graph ir_graph;
74 * entity - An abstract data type to represent program entites.
78 * owner A compound type this entity is a part of.
79 * type The type of this entity.
80 * name The string that represents this entity in the source program.
81 * allocation A flag saying whether the entity is dynamically or statically
82 * allocated (values: dynamic_allocated, static_allocated).
83 * @@@ Does this make sense???
84 * visibility A flag indicating the visibility of this entity (values: local,
85 * external_visible, external_allocated)
86 * variability A flag indicating the variability of this entity (values:
87 * uninitialized, initalized, part_constant, constant)
88 * offset The offset of the entity within the compound object. Only set
89 * if IR in the state "@@@" Wie nennen wir den??
90 * overwrites A list of entities overwritten by this entity. This list is only
91 * existent if the owner of this entity is a class. The members in
92 * this list must be entities of super classes.
93 * link A void* to associate some additional inforamtion with the entity.
94 * irg If the entity is a method this is the ir graph that represents the
98 * These fields can only be accessed via access functions.
105 #ifndef _ENTITY_TYPEDEF_
106 #define _ENTITY_TYPEDEF_
107 /* to resolve recursion between entity.h and type.h */
108 typedef struct entity entity;
111 /* Creates a new entity.
112 Automatically inserts the entity as a member of owner. */
113 entity *new_entity (type *owner, ident *name, type *type);
114 /* Copies the entity if the new_owner is different from the
115 owner of the old entity. Else returns the old entity.
116 Automatically inserts the new entity as a member of owner. */
117 entity *copy_entity_own (entity *old, type *new_owner);
118 /* Copies the entity if the new_name is different from the
119 name of the old entity. Else returns the old entity.
120 Automatically inserts the new entity as a member of owner.
121 The mangled name ld_name is set to NULL. */
122 entity *copy_entity_name (entity *old, ident *new_name);
124 /** manipulate fields of entity **/
125 const char *get_entity_name (entity *ent);
126 ident *get_entity_ident (entity *ent);
127 /* returns the mangled name of the entity. If the mangled name is
128 set it returns the existing name. Else it generates a name
129 with mangle_entity() and remembers this new name internally. */
130 ident *get_entity_ld_ident (entity *ent);
131 void set_entity_ld_ident (entity *ent, ident *ld_ident);
134 char *get_entity_ld_name (entity *ent);
135 void set_entity_ld_name (entity *ent, char *ld_name);
138 type *get_entity_owner (entity *ent);
139 /* Sets the owner field in entity to owner. */
140 void set_entity_owner (entity *ent, type *owner);
141 inline void assert_legal_owner_of_ent(type *owner);
143 type *get_entity_type (entity *ent);
144 void set_entity_type (entity *ent, type *type);
147 dynamic_allocated, /* The entity is allocated during runtime, either explicitly
148 by an Alloc node or implicitly as component of a compound
149 type. This is the default. */
150 static_allocated /* The entity is allocated statically. We can use a
151 SymConst as address of the entity. */
154 ent_allocation get_entity_allocation (entity *ent);
155 void set_entity_allocation (entity *ent, ent_allocation al);
157 /* This enumeration flags the visibility of entities. This is necessary
158 for partial compilation. */
160 local, /* The entity is only visible locally. This is the default. */
161 external_visible, /* The entity is visible to other external program parts, but
162 it is defined here. It may not be optimized away. The entity must
163 be static_allocated. */
164 external_allocated /* The entity is defined and allocated externaly. This compilation
165 must not allocate memory for this entity. The entity must
166 be static_allocated. */
169 ent_visibility get_entity_visibility (entity *ent);
170 void set_entity_visibility (entity *ent, ent_visibility vis);
172 /* This enumeration flags the variability of entities. */
174 uninitialized, /* The content of the entity is completely unknown. */
175 initialized, /* After allocation the entity is initalized with the
176 value given somewhere in the entity. */
177 part_constant, /* For entities of compound types. Some members of the entity
178 are constant. The others are uninitialized. Those members
179 given a value for are constant. */
180 constant /* The entity is constant. */
183 ent_variability get_entity_variability (entity *ent);
184 void set_entity_variability (entity *ent, ent_variability var);
186 /* Set has no effect for entities of type method. */
187 ir_node * get_atomic_ent_value(entity *ent);
188 void set_atomic_ent_value(entity *ent, ir_node *val);
190 /* A value of a compound entity is a pair of value and the corresponding member of
192 void add_compound_ent_value(entity *ent, ir_node *val, entity *member);
193 int get_compound_ent_n_values(entity *ent);
194 ir_node *get_compound_ent_value(entity *ent, int pos);
195 entity *get_compound_ent_value_member(entity *ent, int pos);
196 void set_compound_ent_value(entity *ent, ir_node *val, entity *member, int pos);
198 /* Only set if layout = fixed. */
199 int get_entity_offset (entity *ent);
200 void set_entity_offset (entity *ent, int offset);
202 /* Overwrites is a field that specifies that an access to the overwritten
203 entity in the supertype must use this entity. It's a list as with
204 multiple inheritance several enitites can be overwritten. This field
205 is mostly useful for method entities.
206 If a Sel node selects an entity that is overwritten by other entities it
207 must return a pointer to the entity of the dynamic type of the pointer
208 that is passed to it. Lowering of the Sel node must assure this. */
209 void add_entity_overwrites (entity *ent, entity *overwritten);
210 int get_entity_n_overwrites (entity *ent);
211 entity *get_entity_overwrites (entity *ent, int pos);
212 void set_entity_overwrites (entity *ent, int pos, entity *overwritten);
213 /* Do we need a second relation "overwritten"? */
215 /* A link to store intermediate information */
216 void* get_entity_link(entity *ent);
217 void set_entity_link(entity *ent, void *l);
219 /* The entity knows the corresponding irg if the entity is a method.
220 This allows to get from a Call to the called irg. */
221 ir_graph *get_entity_irg(entity *ent);
222 void set_entity_irg(entity *ent, ir_graph *irg);
225 /* Returns true if the type of the entity is a primitive, pointer
226 enumeration or method type. */
227 int is_atomic_entity(entity *ent);
228 /* Returns true if the type of the entity is a class, structure,
229 array or union type. */
230 int is_compound_entity(entity *ent);
235 # endif /* _ENTITY_H_ */