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 * irg If the entity is a method this is the ir graph that represents the
95 * These fields can only be accessed via access functions.
102 #ifndef _ENTITY_TYPEDEF_
103 #define _ENTITY_TYPEDEF_
104 /* to resolve recursion between entity.h and type.h */
105 typedef struct entity entity;
108 /* Creates a new entity.
109 Automatically inserts the entity as a member of owner. */
110 entity *new_entity (type *owner, ident *name, type *type);
111 /* Copies the entity if the new_owner is different from the
112 owner of the old entity. Else returns the old entity.
113 Automatically inserts the new entity as a member of owner. */
114 entity *copy_entity_own (entity *old, type *new_owner);
115 /* Copies the entity if the new_name is different from the
116 name of the old entity. Else returns the old entity.
117 Automatically inserts the new entity as a member of owner.
118 The mangled name ld_name is set to NULL. */
119 entity *copy_entity_name (entity *old, ident *new_name);
121 /** manipulate fields of entity **/
122 const char *get_entity_name (entity *ent);
123 ident *get_entity_ident (entity *ent);
124 /* returns the mangled name of the entity. If the mangled name is
125 set it returns the existing name. Else it generates a name
126 with mangle_entity() and remembers this new name internally. */
127 ident *get_entity_ld_ident (entity *ent);
128 void set_entity_ld_ident (entity *ent, ident *ld_ident);
131 char *get_entity_ld_name (entity *ent);
132 void set_entity_ld_name (entity *ent, char *ld_name);
135 type *get_entity_owner (entity *ent);
136 /* Sets the owner field in entity to owner. */
137 void set_entity_owner (entity *ent, type *owner);
138 inline void assert_legal_owner_of_ent(type *owner);
140 type *get_entity_type (entity *ent);
141 void set_entity_type (entity *ent, type *type);
144 dynamic_allocated, /* The entity is allocated during runtime, either explicitly
145 by an Alloc node or implicitly as component of a compound
146 type. This is the default. */
147 static_allocated /* The entity is allocated statically. We can use a
148 SymConst as address of the entity. */
151 ent_allocation get_entity_allocation (entity *ent);
152 void set_entity_allocation (entity *ent, ent_allocation al);
154 /* This enumeration flags the visibility of entities. This is necessary
155 for partial compilation. */
157 local, /* The entity is only visible locally. This is the default. */
158 external_visible, /* The entity is visible to other external program parts, but
159 it is defined here. It may not be optimized away. The entity must
160 be static_allocated. */
161 external_allocated /* The entity is defined and allocated externaly. This compilation
162 must not allocate memory for this entity. The entity must
163 be static_allocated. */
166 ent_visibility get_entity_visibility (entity *ent);
167 void set_entity_visibility (entity *ent, ent_visibility vis);
169 int get_entity_offset (entity *ent);
170 void set_entity_offset (entity *ent, int offset);
172 /* Overwrites is a field that specifies that an access to the overwritten
173 entity in the supertype must use this entity. It's a list as with
174 multiple inheritance several enitites can be overwritten. This field
175 is mostly useful for method entities.
176 If a Sel node selects an entity that is overwritten by other entities it
177 must return a pointer to the entity of the dynamic type of the pointer
178 that is passed to it. Lowering of the Sel node must assure this. */
179 void add_entity_overwrites (entity *ent, entity *overwritten);
180 int get_entity_n_overwrites (entity *ent);
181 entity *get_entity_overwrites (entity *ent, int pos);
182 void set_entity_overwrites (entity *ent, int pos, entity *overwritten);
183 /* Do we need a second relation "overwritten"? */
185 /* The entity knows the corresponding irg if the entity is a method.
186 This allows to get from a Call to the called irg. */
187 ir_graph *get_entity_irg(entity *ent);
188 void set_entity_irg(entity *ent, ir_graph *irg);
194 # endif /* _ENTITY_H_ */