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 * automatic_allocated).
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 the owner in the state "layout_fixed".
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 * overwrittenby A list of entities that overwrite this entity. This list is only
94 * existent if the owner of this entity is a class. The members in
95 * this list must be entities of sub classes.
96 * link A void* to associate some additional information with the entity.
97 * irg If the entity is a method this is the ir graph that represents the
99 * peculiarity The peculiarity of the entity. If the entity is a method this
100 * indicates whether the entity represents
101 * a real method or whether it only exists to describe an interface.
102 * In that case there nowhere exists code for this entity and this entity
103 * is never dynamically used in the code.
104 * Values: description, existent. Default: existent.
106 * These fields can only be accessed via access functions.
113 #ifndef _ENTITY_TYPEDEF_
114 #define _ENTITY_TYPEDEF_
115 /* to resolve recursion between entity.h and type.h */
116 typedef struct entity entity;
119 /* Creates a new entity.
120 Automatically inserts the entity as a member of owner.
121 Entity is automatic_allocated and uninitialize except if the type
122 is type_method, then it is static_allocated and constant. The constant
123 value is a pointer to the method.
124 Visibility is local, offset -1, and it is not volatile. */
125 entity *new_entity (type *owner, ident *name, type *type);
126 /* Copies the entity if the new_owner is different from the
127 owner of the old entity. Else returns the old entity.
128 Automatically inserts the new entity as a member of owner. */
129 entity *copy_entity_own (entity *old, type *new_owner);
130 /* Copies the entity if the new_name is different from the
131 name of the old entity. Else returns the old entity.
132 Automatically inserts the new entity as a member of owner.
133 The mangled name ld_name is set to NULL. */
134 entity *copy_entity_name (entity *old, ident *new_name);
136 /** manipulate fields of entity **/
137 const char *get_entity_name (entity *ent);
138 ident *get_entity_ident (entity *ent);
139 /* returns the mangled name of the entity. If the mangled name is
140 set it returns the existing name. Else it generates a name
141 with mangle_entity() and remembers this new name internally. */
142 ident *get_entity_ld_ident (entity *ent);
143 void set_entity_ld_ident (entity *ent, ident *ld_ident);
144 const char *get_entity_ld_name (entity *end);
147 char *get_entity_ld_name (entity *ent);
148 void set_entity_ld_name (entity *ent, char *ld_name);
151 type *get_entity_owner (entity *ent);
152 /* Sets the owner field in entity to owner. */
153 void set_entity_owner (entity *ent, type *owner);
154 inline void assert_legal_owner_of_ent(type *owner);
156 type *get_entity_type (entity *ent);
157 void set_entity_type (entity *ent, type *type);
160 automatic_allocated,/* The entity is allocated during runtime, implicitly
161 as component of a compound type. This is the default. */
162 dynamic_allocated, /* The entity is allocated during runtime, explicitly
164 static_allocated /* The entity is allocated statically. We can use a
165 SymConst(?) as address of the entity. */
168 ent_allocation get_entity_allocation (entity *ent);
169 void set_entity_allocation (entity *ent, ent_allocation al);
171 /* This enumeration flags the visibility of entities. This is necessary
172 for partial compilation. */
174 local, /* The entity is only visible locally. This is the default. */
175 external_visible, /* The entity is visible to other external program parts, but
176 it is defined here. It may not be optimized away. The entity must
177 be static_allocated. */
178 external_allocated /* The entity is defined and allocated externally. This compilation
179 must not allocate memory for this entity. The entity must
180 be static_allocated. */
183 ent_visibility get_entity_visibility (entity *ent);
184 void set_entity_visibility (entity *ent, ent_visibility vis);
186 /* This enumeration flags the variability of entities. */
188 uninitialized, /* The content of the entity is completely unknown. */
189 initialized, /* After allocation the entity is initalized with the
190 value given somewhere in the entity. */
191 part_constant, /* For entities of compound types. Some members of the entity
192 are constant. The others are uninitialized. Those members
193 given a value for are constant. */
194 constant /* The entity is constant. */
197 ent_variability get_entity_variability (entity *ent);
198 void set_entity_variability (entity *ent, ent_variability var);
200 /* This enumeration flags the volatility of entities. */
202 non_volatile, /* The entity is not volatile */
203 is_volatile /* The entity is volatile */
206 ent_volatility get_entity_volatility (entity *ent);
207 void set_entity_volatility (entity *ent, ent_volatility vol);
209 /* For the definition of enumeration peculiarity see type.h */
210 peculiarity get_entity_peculiarity (entity *ent);
211 void set_entity_peculiarity (entity *ent, peculiarity pec);
213 /* Copies a firm subgraph that complies to the restrictions for
214 constant expressions to current_block in current_ir_graph. */
215 ir_node *copy_const_value(ir_node *n);
217 /* Set has no effect for entities of type method. */
218 ir_node *get_atomic_ent_value(entity *ent);
219 void set_atomic_ent_value(entity *ent, ir_node *val);
220 /* Copies the value represented by the entity to current_block
221 in current_ir_graph. @@@ oblivious, use copy_const_vallue */
222 ir_node *copy_atomic_ent_value(entity *ent);
224 /* A value of a compound entity is a pair of value and the corresponding
225 member of the compound. */
226 void add_compound_ent_value(entity *ent, ir_node *val, entity *member);
227 /* oblivious, use copy_const_value @@@ */
228 void copy_and_add_compound_ent_value(entity *ent, ir_node *val, entity *member);
229 int get_compound_ent_n_values(entity *ent);
230 ir_node *get_compound_ent_value(entity *ent, int pos);
231 entity *get_compound_ent_value_member(entity *ent, int pos);
232 void set_compound_ent_value(entity *ent, ir_node *val, entity *member, int pos);
233 /* Inits the entity ent witch must be of a one dimensional
234 array type with the values given in the values array.
235 The array must have a lower and an upper bound. Keeps the
236 order of values. Does not test whether the number of values
237 fits into the given array size. Does not test whether the
238 values have the proper mode for the array. */
239 void set_array_entity_values(entity *ent, tarval **values, int num_vals);
240 /* Copies the value pos of the entity to current_block in current_ir_graph. */
241 ir_node *copy_compound_ent_value(entity *ent, int pos);
243 /* Only set if layout = fixed. */
244 int get_entity_offset (entity *ent);
245 void set_entity_offset (entity *ent, int offset);
247 /* Overwrites is a field that specifies that an access to the overwritten
248 entity in the supertype must use this entity. It's a list as with
249 multiple inheritance several enitites can be overwritten. This field
250 is mostly useful for method entities.
251 If a Sel node selects an entity that is overwritten by other entities it
252 must return a pointer to the entity of the dynamic type of the pointer
253 that is passed to it. Lowering of the Sel node must assure this.
254 Overwrittenby is the inverse of overwrites. Both add routines add
255 both relations, they only differ in the order of arguments. */
256 void add_entity_overwrites (entity *ent, entity *overwritten);
257 int get_entity_n_overwrites (entity *ent);
258 entity *get_entity_overwrites (entity *ent, int pos);
259 void set_entity_overwrites (entity *ent, int pos, entity *overwritten);
260 void add_entity_overwrittenby (entity *ent, entity *overwrites);
261 int get_entity_n_overwrittenby (entity *ent);
262 entity *get_entity_overwrittenby (entity *ent, int pos);
263 void set_entity_overwrittenby (entity *ent, int pos, entity *overwrites);
265 /* A link to store intermediate information */
266 void* get_entity_link(entity *ent);
267 void set_entity_link(entity *ent, void *l);
269 /* The entity knows the corresponding irg if the entity is a method.
270 This allows to get from a Call to the called irg.
271 Only entities of peculiarity "existent" can have a corresponding irg,
272 else the field is fixed to NULL. (Get returns NULL, set asserts.) */
273 ir_graph *get_entity_irg(entity *ent);
274 void set_entity_irg(entity *ent, ir_graph *irg);
277 /* Returns true if the type of the entity is a primitive, pointer
278 enumeration or method type. */
279 int is_atomic_entity(entity *ent);
280 /* Returns true if the type of the entity is a class, structure,
281 array or union type. */
282 int is_compound_entity(entity *ent);
287 # endif /* _ENTITY_H_ */