ipa-cp.c: New file.

	* ipa-cp.c: New file. Contains IPCP specific functionality.
	* ipa-prop.h: New file. Contains structures/definitions that can be
	used by several interprocedural data flow optimizations (and also IPCP).
	* ipa-prop.c: New file.

From-SVN: r102624

gcc/ipa-prop.h

+/* Interprocedural analyses.
+   Copyright (C) 2005 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 2, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING.  If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA.  */
+
+#ifndef IPA_PROP_H
+#define IPA_PROP_H
+
+#include "tree.h"
+
+/* The following definitions and interfaces are used by
+   interprocedural analyses.  */
+
+/* A jump function for a callsite represents the values passed as actual 
+   arguments of the callsite. There are three main types of values :
+   Formal - the caller's formal parameter is passed as an actual argument.
+   Constant - a constant is passed as a an actual argument.
+   Unknown - neither of the above.
+   Integer and real constants are represented as CONST_IPATYPE and Fortran 
+   constants are represented as CONST_IPATYPE_REF.  */
+enum jump_func_type
+{
+  UNKNOWN_IPATYPE,
+  CONST_IPATYPE,
+  CONST_IPATYPE_REF,
+  FORMAL_IPATYPE
+};
+
+/* All formal parameters in the program have a cval computed by 
+   the interprocedural stage of IPCP.  
+   There are three main values of cval :
+   TOP - unknown.
+   BOTTOM - non constant.
+   CONSTANT_TYPE - constant value.
+   Cval of formal f will have a constant value if all callsites to this
+   function have the same constant value passed to f.
+   Integer and real constants are represented as CONST_IPATYPE and Fortran
+   constants are represented as CONST_IPATYPE_REF.  */
+enum cvalue_type
+{
+  BOTTOM,
+  CONST_VALUE,
+  CONST_VALUE_REF,
+  TOP
+};
+
+/* Represents the value of either jump function or cval.
+   value represnts a constant.
+   formal_id is used only in jump function context and represents 
+   pass-through parameter (the formal of caller is passed 
+   as argument).  */
+union parameter_info
+{
+  unsigned int formal_id;
+  tree value;
+};
+
+/* A jump function for a callsite represents the values passed as actual 
+   arguments of the callsite. See enum jump_func_type for the various 
+   types of jump functions supported.  */
+struct ipa_jump_func
+{
+  enum jump_func_type type;
+  union parameter_info info_type;
+};
+
+/* All formal parameters in the program have a cval computed by 
+   the interprocedural stage of IPCP. See enum cvalue_type for 
+   the various types of cvals supported */
+struct ipcp_formal
+{
+  enum cvalue_type cval_type;
+  union parameter_info cvalue;
+};
+
+/* Represent which DECL tree (or reference to such tree)
+   will be replaced by another tree while versioning.  */
+struct ipa_replace_map
+{
+  /* The tree that will be replaced.  */
+  tree old_tree;
+  /* The new (replacing) tree.  */ 
+  tree new_tree;
+  /* True when a substitution should be done, false otherwise.  */
+  bool replace_p;
+  /* True when we replace a reference to old_tree.  */
+  bool ref_p;
+};
+
+/* Return the field in cgraph_node/cgraph_edge struct that points
+   to ipa_node/ipa_edge struct.  */
+#define IPA_NODE_REF(MT) ((struct ipa_node *)(MT)->aux)
+#define IPA_EDGE_REF(EDGE) ((struct ipa_edge *)(EDGE)->aux)
+
+/* ipa_node stores information related to a method and
+   its formal parameters. It is pointed to by a field in the
+   method's corresponding cgraph_node.
+
+   ipa_edge stores information related to a callsite and
+   its arguments. It is pointed to by a field in the
+   callsite's corresponding cgraph_edge.  */
+struct ipa_node
+{
+  /* Number of formal parameters of this method.  When set to 0,
+     this method's parameters would not be analyzed by the different
+     stages of IPA CP.  */
+  int ipa_arg_num;
+  /* Array of cvals.  */
+  struct ipcp_formal *ipcp_cval;
+  /* Mapping each parameter to its PARM_DECL tree.  */
+  tree *ipa_param_tree;
+  /* Indicating which parameter is modified in its method.  */
+  bool *ipa_mod;
+  /* Only for versioned nodes this field would not be NULL,
+     it points to the node that IPA cp cloned from.  */
+  struct cgraph_node *ipcp_orig_node;
+  /* Meaningful only for original methods.  Expresses the 
+     ratio between the direct calls and sum of all invocations of 
+     this function (given by profiling info).  It is used to calculate 
+     the profiling information of the original function and the versioned
+     one.  */
+  gcov_type count_scale;
+};
+
+struct ipa_edge
+{
+  /* Number of actual arguments in this callsite.  When set to 0,
+     this callsite's parameters would not be analyzed by the different
+     stages of IPA CP.  */
+  int ipa_param_num;
+  /* Array of the callsite's jump function of each parameter.  */
+  struct ipa_jump_func *ipa_param_map;
+};
+
+/* A methodlist element (referred to also as methodlist node). It is used 
+   to create a temporary worklist used in 
+   the propagation stage of IPCP. (can be used for more IPA 
+   optimizations)  */
+struct ipa_methodlist
+{
+  struct cgraph_node *method_p;
+  struct ipa_methodlist *next_method;
+};
+
+/* A pointer to a methodlist elemement.  */
+typedef struct ipa_methodlist *ipa_methodlist_p;
+
+/* ipa_methodlist interface.  */
+ipa_methodlist_p ipa_methodlist_init (void);
+bool ipa_methodlist_not_empty (ipa_methodlist_p);
+void ipa_add_method (ipa_methodlist_p *, struct cgraph_node *);
+struct cgraph_node *ipa_remove_method (ipa_methodlist_p *);
+
+/* ipa_callsite interface.  */
+int ipa_callsite_param_count (struct cgraph_edge *);
+void ipa_callsite_param_count_set (struct cgraph_edge *, int);
+struct ipa_jump_func *ipa_callsite_param (struct cgraph_edge *, int);
+struct cgraph_node *ipa_callsite_callee (struct cgraph_edge *);
+void ipa_callsite_compute_param (struct cgraph_edge *);
+void ipa_callsite_compute_count (struct cgraph_edge *);
+
+/* ipa_method interface.  */
+int ipa_method_formal_count (struct cgraph_node *);
+void ipa_method_formal_count_set (struct cgraph_node *, int);
+tree ipa_method_get_tree (struct cgraph_node *, int);
+void ipa_method_compute_tree_map (struct cgraph_node *);
+void ipa_method_formal_compute_count (struct cgraph_node *);
+void ipa_method_compute_modify (struct cgraph_node *);
+
+/* jump function interface.  */
+enum jump_func_type get_type (struct ipa_jump_func *);
+union parameter_info *ipa_jf_get_info_type (struct ipa_jump_func *);
+
+/* ipa_node and ipa_edge interfaces.  */
+void ipa_node_create (struct cgraph_node *);
+void ipa_free (void);
+void ipa_nodes_create (void);
+void ipa_edges_create (void);
+void ipa_edges_free (void);
+void ipa_nodes_free (void);
+
+
+/* Debugging interface.  */
+void ipa_method_tree_print (FILE *);
+void ipa_method_modify_print (FILE *);
+
+void ipcp_driver (void);
+
+#endif /* IPA_PROP_H */