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 * offset The offset of the entity within the compound object. Only set
87 * if IR in the state "@@@" Wie nennen wir den??
88 * overwrites A list of entities overwritten by this entity. This list is only
89 * existent if the owner of this entity is a class. The members in
90 * this list must be entities of super classes.
91 * link A void* to associate some additional inforamtion with the entity.
92 * irg If the entity is a method this is the ir graph that represents the
96 * These fields can only be accessed via access functions.
103 #ifndef _ENTITY_TYPEDEF_
104 #define _ENTITY_TYPEDEF_
105 /* to resolve recursion between entity.h and type.h */
106 typedef struct entity entity;
109 /* Creates a new entity.
110 Automatically inserts the entity as a member of owner. */
111 entity *new_entity (type *owner, ident *name, type *type);
112 /* Copies the entity if the new_owner is different from the
113 owner of the old entity. Else returns the old entity.
114 Automatically inserts the new entity as a member of owner. */
115 entity *copy_entity_own (entity *old, type *new_owner);
116 /* Copies the entity if the new_name is different from the
117 name of the old entity. Else returns the old entity.
118 Automatically inserts the new entity as a member of owner.
119 The mangled name ld_name is set to NULL. */
120 entity *copy_entity_name (entity *old, ident *new_name);
122 /** manipulate fields of entity **/
123 const char *get_entity_name (entity *ent);
124 ident *get_entity_ident (entity *ent);
125 /* returns the mangled name of the entity. If the mangled name is
126 set it returns the existing name. Else it generates a name
127 with mangle_entity() and remembers this new name internally. */
128 ident *get_entity_ld_ident (entity *ent);
129 void set_entity_ld_ident (entity *ent, ident *ld_ident);
132 char *get_entity_ld_name (entity *ent);
133 void set_entity_ld_name (entity *ent, char *ld_name);
136 type *get_entity_owner (entity *ent);
137 /* Sets the owner field in entity to owner. */
138 void set_entity_owner (entity *ent, type *owner);
139 inline void assert_legal_owner_of_ent(type *owner);
141 type *get_entity_type (entity *ent);
142 void set_entity_type (entity *ent, type *type);
145 dynamic_allocated, /* The entity is allocated during runtime, either explicitly
146 by an Alloc node or implicitly as component of a compound
147 type. This is the default. */
148 static_allocated /* The entity is allocated statically. We can use a
149 SymConst as address of the entity. */
152 ent_allocation get_entity_allocation (entity *ent);
153 void set_entity_allocation (entity *ent, ent_allocation al);
155 /* This enumeration flags the visibility of entities. This is necessary
156 for partial compilation. */
158 local, /* The entity is only visible locally. This is the default. */
159 external_visible, /* The entity is visible to other external program parts, but
160 it is defined here. It may not be optimized away. The entity must
161 be static_allocated. */
162 external_allocated /* The entity is defined and allocated externaly. This compilation
163 must not allocate memory for this entity. The entity must
164 be static_allocated. */
167 ent_visibility get_entity_visibility (entity *ent);
168 void set_entity_visibility (entity *ent, ent_visibility vis);
170 int get_entity_offset (entity *ent);
171 void set_entity_offset (entity *ent, int offset);
173 /* Overwrites is a field that specifies that an access to the overwritten
174 entity in the supertype must use this entity. It's a list as with
175 multiple inheritance several enitites can be overwritten. This field
176 is mostly useful for method entities.
177 If a Sel node selects an entity that is overwritten by other entities it
178 must return a pointer to the entity of the dynamic type of the pointer
179 that is passed to it. Lowering of the Sel node must assure this. */
180 void add_entity_overwrites (entity *ent, entity *overwritten);
181 int get_entity_n_overwrites (entity *ent);
182 entity *get_entity_overwrites (entity *ent, int pos);
183 void set_entity_overwrites (entity *ent, int pos, entity *overwritten);
184 /* Do we need a second relation "overwritten"? */
186 /* A link to store intermediate information */
187 void* get_entity_link(entity *ent);
188 void set_entity_link(entity *ent, void *l);
190 /* The entity knows the corresponding irg if the entity is a method.
191 This allows to get from a Call to the called irg. */
192 ir_graph *get_entity_irg(entity *ent);
193 void set_entity_irg(entity *ent, ir_graph *irg);
199 # endif /* _ENTITY_H_ */