/*
- * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved.
+ * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
*
* This file is part of libFirm.
*
/** The alias relation of two memory addresses. */
typedef enum {
- no_alias, /**< No alias. */
- may_alias, /**< Unknown state, may alias. */
- sure_alias /**< Sure alias. */
+ ir_no_alias, /**< No alias. */
+ ir_may_alias, /**< Unknown state, may alias. */
+ ir_sure_alias /**< Sure alias. */
} ir_alias_relation;
-/** The state of the address taken flags. */
+/** The state of the entity usage flags. */
typedef enum {
- ir_address_taken_not_computed, /**< Address taken flag is not computed. */
- ir_address_taken_computed /**< Address taken flag is computed. */
-} ir_address_taken_computed_state;
+ ir_entity_usage_not_computed,
+ ir_entity_usage_computed
+} ir_entity_usage_computed_state;
/** Possible options for the memory disambiguator. */
typedef enum {
aa_opt_byte_type_may_alias = 2, /**< if type based analysis is enabled: bytes types may alias other types */
aa_opt_no_alias = 4, /**< two addresses NEVER alias, use with CAUTION (gcc -fno-alias) */
aa_opt_inherited = 128 /**< only for implementation: options from a graph are inherited from global */
-} disambuigator_options;
+} ir_disambuigator_options;
+
+/**
+ * Classify storage locations.
+ * Except ir_sc_pointer they are all disjoint.
+ * ir_sc_pointer potentially aliases all classes which don't have a
+ * NOTTAKEN modifier.
+ */
+typedef enum {
+ ir_sc_pointer = 0x0, /**< generic pointer, may be anything */
+ ir_sc_globalvar = 0x1, /**< an address of a global variable */
+ ir_sc_localvar = 0x2, /**< an address of a local variable */
+ ir_sc_argument = 0x3, /**< an method argument */
+ ir_sc_tls = 0x4, /**< an address of a thread local storage variable */
+ ir_sc_malloced = 0x5, /**< an allocated heap address */
+
+ ir_sc_modifier_nottaken = 0x80 /**< if set, the address of the variable was not taken */
+} ir_storage_class_class_t;
/**
* A source language specific memory disambiguator function.
ir_node *adr1, ir_mode *mode1,
ir_node *adr2, ir_mode *mode2);
+/**
+ * Classify a base pointer.
+ *
+ * @param irg the graph of the pointer
+ * @param irn the node representing the base address
+ * @param ent the base entity of the base address iff any
+ */
+ir_storage_class_class_t classify_pointer(ir_graph *irg, ir_node *irn, ir_entity *ent);
+
/**
* Returns a human readable name for an alias relation.
*/
* The memory disambiguator tries to determine the alias state between
* two memory addresses. The following rules are used:
*
- * - variables from different segments never alias (R1)
+ * - different variable from the same segment never alias (R1 a)
+ * - variables from different segments never alias when:
* - a global variable and a local one never alias (R1 b)
* - a global variable and a TLS one never alias (R1 c)
* - a local variable and a TLS one never alias (R1 d)
* - a local variable and a parameter never alias (R1 e)
+ * - a global variable and the result of a malloc routine never alias (R1 f)
+ * - a local variable and the result of a malloc routine never alias (R1 g)
+ * - a TLS variable and the result of a malloc routine never alias (R1 h)
+ * - a parameter and the result of a malloc routine (obtained in the
+ * same routine as the parameter) never alias (R1 i)
* - two different variables never alias (R2)
* - if one is a variable whose address has never been taken
* there is no alias (R3)
*/
void mem_disambig_term(void);
-/**
- * Returns the current address taken state of the graph.
- */
-ir_address_taken_computed_state get_irg_address_taken_state(const ir_graph *irg);
+ir_entity_usage_computed_state get_irg_entity_usage_state(const ir_graph *irg);
-/**
- * Sets the current address taken state of the graph.
- *
- * @param irg the graph
- * @param state the new state
- */
-void set_irg_address_taken_state(ir_graph *irg, ir_address_taken_computed_state state);
+void set_irg_entity_usage_state(ir_graph *irg, ir_entity_usage_computed_state state);
/**
- * Assure that the address taken flag is computed for the given graph.
+ * Assure that the entity usage flags have been computed for the given graph.
*
- * This is an intraprocedural analysis that computes the address_taken state
+ * This is an intraprocedural analysis that computes the entity usage state
* for all local variables.
*
* Note that this is a conservative estimation that by no Firm transformation
* can be invalidated, so it's only recomputed if manually triggered by calling
- * set_irg_address_taken_state(irg, ir_address_taken_not_computed).
+ * set_irg_entity_usage_state(irg, ir_entity_usage_not_computed).
* Even then the information is not cleaned from the variables, call
- * assure_irg_address_taken_computed() again for recomputation.
+ * assure_irg_entity_usage_computed() again for recomputation.
*/
-void assure_irg_address_taken_computed(ir_graph *irg);
+void assure_irg_entity_usage_computed(ir_graph *irg);
/**
* Returns the current address taken state of the globals.
*/
-ir_address_taken_computed_state get_irp_globals_address_taken_state(void);
+ir_entity_usage_computed_state get_irp_globals_entity_usage_state(void);
/**
* Sets the current address taken state of the globals.
*
* @param state the new state
*/
-void set_irp_globals_address_taken_state(ir_address_taken_computed_state state);
+void set_irp_globals_entity_usage_state(ir_entity_usage_computed_state state);
/**
* Assure that the address taken flag is computed for the global and TLS entities (variables).
*
* Note that this is a conservative estimation that by no Firm transformation
* can be invalidated, so it's only recomputed if manually triggered by calling
- * set_irp_globals_address_taken_state(ir_address_taken_not_computed).
+ * set_irp_globals_entity_usage_state(ir_entity_usage_not_computed).
* Even then the information is not cleaned from the variables, call
- * assure_irp_globals_address_taken_computed() again for recomputation.
+ * assure_irp_globals_entity_usage_computed() again for recomputation.
*/
-void assure_irp_globals_address_taken_computed(void);
+void assure_irp_globals_entity_usage_computed(void);
/**
* Get the memory disambiguator options for a graph.
projects / libfirm / blobdiff