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 is automatic_allocated and uninitialize except if the type
114 is type_method, then it is static_allocated and constant. The constant
115 value is a pointer to the method.
116 Visibility is local, offset -1, and it is not volatile. */
117 entity *new_entity (type *owner, ident *name, type *type);
118 /* Copies the entity if the new_owner is different from the
119 owner of the old entity. Else returns the old entity.
120 Automatically inserts the new entity as a member of owner. */
121 entity *copy_entity_own (entity *old, type *new_owner);
122 /* Copies the entity if the new_name is different from the
123 name of the old entity. Else returns the old entity.
124 Automatically inserts the new entity as a member of owner.
125 The mangled name ld_name is set to NULL. */
126 entity *copy_entity_name (entity *old, ident *new_name);
128 /** manipulate fields of entity **/
129 const char *get_entity_name (entity *ent);
130 ident *get_entity_ident (entity *ent);
131 /* returns the mangled name of the entity. If the mangled name is
132 set it returns the existing name. Else it generates a name
133 with mangle_entity() and remembers this new name internally. */
134 ident *get_entity_ld_ident (entity *ent);
135 void set_entity_ld_ident (entity *ent, ident *ld_ident);
136 const char *get_entity_ld_name (entity *end);
139 char *get_entity_ld_name (entity *ent);
140 void set_entity_ld_name (entity *ent, char *ld_name);
143 type *get_entity_owner (entity *ent);
144 /* Sets the owner field in entity to owner. */
145 void set_entity_owner (entity *ent, type *owner);
146 inline void assert_legal_owner_of_ent(type *owner);
148 type *get_entity_type (entity *ent);
149 void set_entity_type (entity *ent, type *type);
152 automatic_allocated,/* The entity is allocated during runtime, implicitly
153 as component of a compound type. This is the default. */
154 dynamic_allocated, /* The entity is allocated during runtime, explicitly
156 static_allocated /* The entity is allocated statically. We can use a
157 SymConst(?) as address of the entity. */
160 ent_allocation get_entity_allocation (entity *ent);
161 void set_entity_allocation (entity *ent, ent_allocation al);
163 /* This enumeration flags the visibility of entities. This is necessary
164 for partial compilation. */
166 local, /* The entity is only visible locally. This is the default. */
167 external_visible, /* The entity is visible to other external program parts, but
168 it is defined here. It may not be optimized away. The entity must
169 be static_allocated. */
170 external_allocated /* The entity is defined and allocated externaly. This compilation
171 must not allocate memory for this entity. The entity must
172 be static_allocated. */
175 ent_visibility get_entity_visibility (entity *ent);
176 void set_entity_visibility (entity *ent, ent_visibility vis);
178 /* This enumeration flags the variability of entities. */
180 uninitialized, /* The content of the entity is completely unknown. */
181 initialized, /* After allocation the entity is initalized with the
182 value given somewhere in the entity. */
183 part_constant, /* For entities of compound types. Some members of the entity
184 are constant. The others are uninitialized. Those members
185 given a value for are constant. */
186 constant /* The entity is constant. */
189 ent_variability get_entity_variability (entity *ent);
190 void set_entity_variability (entity *ent, ent_variability var);
192 /* This enumeration flags the volatility of entities. */
194 non_volatile, /* The entity is not volatile */
195 is_volatile /* The entity is volatile */
198 ent_volatility get_entity_volatility (entity *ent);
199 void set_entity_volatility (entity *ent, ent_volatility vol);
201 /* Set has no effect for entities of type method. */
202 ir_node *get_atomic_ent_value(entity *ent);
203 void set_atomic_ent_value(entity *ent, ir_node *val);
204 /* Copies the value represented by the entity to current_block
205 in current_ir_graph. */
206 ir_node *copy_atomic_ent_value(entity *ent);
208 /* A value of a compound entity is a pair of value and the corresponding
209 member of the compound. */
210 void add_compound_ent_value(entity *ent, ir_node *val, entity *member);
211 int get_compound_ent_n_values(entity *ent);
212 ir_node *get_compound_ent_value(entity *ent, int pos);
213 entity *get_compound_ent_value_member(entity *ent, int pos);
214 void set_compound_ent_value(entity *ent, ir_node *val, entity *member, int pos);
215 /* Copies the value pos of the entity to current_block in current_ir_graph. */
216 ir_node *copy_compound_ent_value(entity *ent, int pos);
218 /* Only set if layout = fixed. */
219 int get_entity_offset (entity *ent);
220 void set_entity_offset (entity *ent, int offset);
222 /* Overwrites is a field that specifies that an access to the overwritten
223 entity in the supertype must use this entity. It's a list as with
224 multiple inheritance several enitites can be overwritten. This field
225 is mostly useful for method entities.
226 If a Sel node selects an entity that is overwritten by other entities it
227 must return a pointer to the entity of the dynamic type of the pointer
228 that is passed to it. Lowering of the Sel node must assure this. */
229 void add_entity_overwrites (entity *ent, entity *overwritten);
230 int get_entity_n_overwrites (entity *ent);
231 entity *get_entity_overwrites (entity *ent, int pos);
232 void set_entity_overwrites (entity *ent, int pos, entity *overwritten);
233 /* Do we need a second relation "overwritten"? */
235 /* A link to store intermediate information */
236 void* get_entity_link(entity *ent);
237 void set_entity_link(entity *ent, void *l);
239 /* The entity knows the corresponding irg if the entity is a method.
240 This allows to get from a Call to the called irg. */
241 ir_graph *get_entity_irg(entity *ent);
242 void set_entity_irg(entity *ent, ir_graph *irg);
245 /* Returns true if the type of the entity is a primitive, pointer
246 enumeration or method type. */
247 int is_atomic_entity(entity *ent);
248 /* Returns true if the type of the entity is a class, structure,
249 array or union type. */
250 int is_compound_entity(entity *ent);
255 # endif /* _ENTITY_H_ */