-/* Copyright (C) 1998 - 2000 by Universitaet Karlsruhe
-** All rights reserved.
+/*
+** Copyright (C) 1998 - 2000 by Universitaet Karlsruhe
+** All rights reserved.
+**
+** Authors: Martin Trapp, Christian Schaefer,
+** Goetz Lindenmaier
+**
+** entity.h: entities represent all program known objects.
+**
+** An entity is the representation of program known objects in Firm.
+** The primary concept of entities is to represent members of complex
+** types, i.e., fields and methods of classes. As not all programming
+** language model all variables and methods as members of some class,
+** the concept of entities is extended to cover also local and global
+** variables, and arbitrary procedures.
+**
+** An entity always specifies the type of the object it represents and
+** the type of the object it is a part of, the owner of the entity.
+** Originally this is the type of the class of which the entity is a
+** member.
+** The owner of local variables is the procedure they are defined in.
+** The owner of global variables and procedures visible in the whole
+** program is a universally defined class type "GlobalType". The owner
+** of procedures defined in the scope of an other procedure is the
+** enclosing procedure.
**
-** Authors: Martin Trapp, Christian Schaefer,
-** Goetz Lindenmaier
+** In detail the datastructure entity has the following fields:
**
-** entity.h: declarations for entity
+** ident *name Name of this entity as specified in the source code.
+** Only unequivocal in conjuction with scope.
+** ident *ld_name Unique name of this entity, i.e., the mangled
+** name. E.g., for a class `A' with field `a' this
+** is the ident for `A_a'.
+** type *type The type of this entity, e.g., a method type, a
+** basic type of the language or a class itself.
+** type *owner; The class this entity belongs to. In case of local
+** variables the method they are defined in.
+** int offset; Offset in byte for this entity. Fixed when layout
+** of owner is determined.
+** ir_graph *irg; If (type == method_type) this is the corresponding irg.
+** The ir_graph constructor automatically sets this field.
+** If (type !- method_type) access of this field will cause
+** an assertion.
*/
# ifndef _ENTITY_H_
/** ENTITY **/
/*******************************************************************/
-typedef struct entity {
- firm_kind kind;
- ident *name; /* name of this entity */
- ident *ld_name; /* Unique name of this entity, i.e., the mangled
- name. E.g., for a class `A' with field `a' this
- is the ident for `A_a'. */
- type *type; /* The type of this entity, e.g., a method type, a
- basic type of the language or a class itself */
- type *owner; /* The class this entity belongs to */
- /* for methods *
- ir_graph *irg; * If (type == method_type) this is the corresponding irg.
- The ir_graph constructor automatically sets this field.
- @@@ Does this go here, or should it be in type_mehtod,
- or should Call have an attribute ent?? */
- /* Do we need to remember the initializer of fields? */
- unsigned long visit; /* visited counter for walks of the type information */
-} entity;
-
-/* create a new entity */
-entity *new_entity (type *owner, ident *name, type *type);
-
-/* manipulate fields of entity */
-char *get_entity_name (entity *);
-ident *get_entity_ident (entity *);
+#ifndef _IR_GRAPH_TYPEDEF_
+#define _IR_GRAPH_TYPEDEF_
+/* to resolve recursion between entity.h and irgraph.h */
+typedef struct ir_graph ir_graph;
+#endif
+
+/****s* entity/entity
+ *
+ * NAME
+ * entity - An abstract data type to represent program entites.
+ * NOTE
+ *
+ * ... not documented ...
+ *
+ * ATTRIBUTES
+ *
+ *
+ * These fields can only be accessed via access functions.
+ *
+ * SEE ALSO
+ * type
+ * SOURCE
+ */
+
+#ifndef _ENTITY_TYPEDEF_
+#define _ENTITY_TYPEDEF_
+/* to resolve recursion between entity.h and type.h */
+typedef struct entity entity;
+#endif
+
+/* Creates a new entity.
+ Automatically inserts the entity as a member of owner. */
+entity *new_entity (type *owner, ident *name, type *type);
+/* Copies the entity if the new_owner is different from the
+ owner of the old entity. Else returns the old entity.
+ Automatically inserts the new entity as a member of owner. */
+entity *copy_entity_own (entity *old, type *new_owner);
+/* Copies the entity if the new_name is different from the
+ name of the old entity. Else returns the old entity.
+ Automatically inserts the new entity as a member of owner.
+ The mangled name ld_name is set to NULL. */
+entity *copy_entity_name (entity *old, ident *new_name);
+
+/** manipulate fields of entity **/
+const char *get_entity_name (entity *ent);
+ident *get_entity_ident (entity *ent);
+/* returns the mangled name of the entity. If the mangled name is
+ set it returns the existing name. Else it generates a name
+ with mangle_entity() and remembers this new name internally. */
+ident *get_entity_ld_ident (entity *ent);
+void set_entity_ld_ident (entity *ent, ident *ld_ident);
/*
-char *get_entity_ld_name (entity *);
-char *get_entity_ld_ident (entity *);
-void set_entity_ld_name (entity *, char *ld_name);
-void set_entity_ld_ident (entity *, ident *ld_ident);
+char *get_entity_ld_name (entity *ent);
+void set_entity_ld_name (entity *ent, char *ld_name);
*/
-type *get_entity_owner (entity *);
-void set_entity_owner (entity *, type *);
-inline void assert_legal_owner_of_ent(type *);
+type *get_entity_owner (entity *ent);
+/* Sets the owner field in entity to owner. */
+void set_entity_owner (entity *ent, type *owner);
+inline void assert_legal_owner_of_ent(type *owner);
+
+type *get_entity_type (entity *ent);
+void set_entity_type (entity *ent, type *type);
-type *get_entity_type (entity *);
-void set_entity_type (entity *, type *);
+typedef enum {
+ dynamic_allocated, /* The entity is allocated during runtime, either explicitly
+ by an Alloc node or implicitly as component of a compound
+ type. This is the default. */
+ static_allocated /* The entity is allocated statically. We can use a
+ SymConst as address of the entity. */
+} ent_allocation;
+
+ent_allocation get_entity_allocation (entity *ent);
+void set_entity_allocation (entity *ent, ent_allocation al);
+
+/* This enumeration flags the visibility of entities. This is necessary
+ for partial compilation. */
+typedef enum {
+ local, /* The entity is only visible locally. This is the default. */
+ external_visible, /* The entity is visible to other external program parts, but
+ it is defined here. It may not be optimized away. The entity must
+ be static_allocated. */
+ external_allocated /* The entity is defined and allocated externaly. This compilation
+ must not allocate memory for this entity. The entity must
+ be static_allocated. */
+} ent_visibility;
+
+ent_visibility get_entity_visibility (entity *ent);
+void set_entity_visibility (entity *ent, ent_visibility vis);
+
+int get_entity_offset (entity *ent);
+void set_entity_offset (entity *ent, int offset);
+
+/* Overwrites is a field that specifies that an access to the overwritten
+ entity in the supertype must use this entity. It's a list as with
+ multiple inheritance several enitites can be overwritten. This field
+ is mostly useful for method entities.
+ If a Sel node selects an entity that is overwritten by other entities it
+ must return a pointer to the entity of the dynamic type of the pointer
+ that is passed to it. Lowering of the Sel node must assure this. */
+void add_entity_overwrites (entity *ent, entity *overwritten);
+int get_entity_n_overwrites (entity *ent);
+entity *get_entity_overwrites (entity *ent, int pos);
+void set_entity_overwrites (entity *ent, int pos, entity *overwritten);
+/* Do we need a second relation "overwritten"? */
/* The entity knows the corresponding irg if the entity is a method.
- This allows to get from a Call to the called irg. *
+ This allows to get from a Call to the called irg. */
ir_graph *get_entity_irg(entity *ent);
void set_entity_irg(entity *ent, ir_graph *irg);
-*/
+
+
+
+/*****/
# endif /* _ENTITY_H_ */
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