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+/* Callgraph handling code.
+ Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
+ Contributed by Jan Hubicka
+
+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, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA. */
+
+#ifndef GCC_CGRAPH_H
+#define GCC_CGRAPH_H
+#include "tree.h"
+#include "basic-block.h"
+
+enum availability
+{
+ /* Not yet set by cgraph_function_body_availability. */
+ AVAIL_UNSET,
+ /* Function body/variable initializer is unknown. */
+ AVAIL_NOT_AVAILABLE,
+ /* Function body/variable initializer is known but might be replaced
+ by a different one from other compilation unit and thus needs to
+ be dealt with a care. Like AVAIL_NOT_AVAILABLE it can have
+ arbitrary side effects on escaping variables and functions, while
+ like AVAILABLE it might access static variables. */
+ AVAIL_OVERWRITABLE,
+ /* Function body/variable initializer is known and will be used in final
+ program. */
+ AVAIL_AVAILABLE,
+ /* Function body/variable initializer is known and all it's uses are explicitly
+ visible within current unit (ie it's address is never taken and it is not
+ exported to other units).
+ Currently used only for functions. */
+ AVAIL_LOCAL
+};
+
+/* Information about the function collected locally.
+ Available after function is analyzed. */
+
+struct cgraph_local_info GTY(())
+{
+ /* Size of the function before inlining. */
+ int self_insns;
+
+ /* Set when function function is visible in current compilation unit only
+ and its address is never taken. */
+ unsigned local : 1;
+
+ /* Set when function is visible by other units. */
+ unsigned externally_visible : 1;
+
+ /* Set once it has been finalized so we consider it to be output. */
+ unsigned finalized : 1;
+
+ /* False when there something makes inlining impossible (such as va_arg). */
+ unsigned inlinable : 1;
+
+ /* True when function should be inlined independently on its size. */
+ unsigned disregard_inline_limits : 1;
+
+ /* True when the function has been originally extern inline, but it is
+ redefined now. */
+ unsigned redefined_extern_inline : 1;
+
+ /* True if statics_read_for_function and
+ statics_written_for_function contain valid data. */
+ unsigned for_functions_valid : 1;
+
+ /* True if the function is going to be emitted in some other translation
+ unit, referenced from vtable. */
+ unsigned vtable_method : 1;
+};
+
+/* Information about the function that needs to be computed globally
+ once compilation is finished. Available only with -funit-at-time. */
+
+struct cgraph_global_info GTY(())
+{
+ /* For inline clones this points to the function they will be inlined into. */
+ struct cgraph_node *inlined_to;
+
+ /* Estimated size of the function after inlining. */
+ int insns;
+
+ /* Estimated growth after inlining. INT_MIN if not computed. */
+ int estimated_growth;
+
+ /* Set iff the function has been inlined at least once. */
+ bool inlined;
+};
+
+/* Information about the function that is propagated by the RTL backend.
+ Available only for functions that has been already assembled. */
+
+struct cgraph_rtl_info GTY(())
+{
+ int preferred_incoming_stack_boundary;
+};
+
+/* The cgraph data structure.
+ Each function decl has assigned cgraph_node listing callees and callers. */
+
+struct cgraph_node GTY((chain_next ("%h.next"), chain_prev ("%h.previous")))
+{
+ tree decl;
+ struct cgraph_edge *callees;
+ struct cgraph_edge *callers;
+ struct cgraph_node *next;
+ struct cgraph_node *previous;
+ /* For nested functions points to function the node is nested in. */
+ struct cgraph_node *origin;
+ /* Points to first nested function, if any. */
+ struct cgraph_node *nested;
+ /* Pointer to the next function with same origin, if any. */
+ struct cgraph_node *next_nested;
+ /* Pointer to the next function in cgraph_nodes_queue. */
+ struct cgraph_node *next_needed;
+ /* Pointer to the next clone. */
+ struct cgraph_node *next_clone;
+ struct cgraph_node *prev_clone;
+ /* Pointer to a single unique cgraph node for this function. If the
+ function is to be output, this is the copy that will survive. */
+ struct cgraph_node *master_clone;
+ /* For functions with many calls sites it holds map from call expression
+ to the edge to speed up cgraph_edge function. */
+ htab_t GTY((param_is (struct cgraph_edge))) call_site_hash;
+
+ PTR GTY ((skip)) aux;
+
+ struct cgraph_local_info local;
+ struct cgraph_global_info global;
+ struct cgraph_rtl_info rtl;
+
+ /* Expected number of executions: calculated in profile.c. */
+ gcov_type count;
+ /* Unique id of the node. */
+ int uid;
+ /* Ordering of all cgraph nodes. */
+ int order;
+
+ /* Set when function must be output - it is externally visible
+ or its address is taken. */
+ unsigned needed : 1;
+ /* Set when function is reachable by call from other function
+ that is either reachable or needed. */
+ unsigned reachable : 1;
+ /* Set once the function is lowered (i.e. its CFG is built). */
+ unsigned lowered : 1;
+ /* Set once the function has been instantiated and its callee
+ lists created. */
+ unsigned analyzed : 1;
+ /* Set when function is scheduled to be assembled. */
+ unsigned output : 1;
+ /* Set for aliases once they got through assemble_alias. */
+ unsigned alias : 1;
+
+ /* In non-unit-at-a-time mode the function body of inline candidates is saved
+ into clone before compiling so the function in original form can be
+ inlined later. This pointer points to the clone. */
+ tree inline_decl;
+};
+
+struct cgraph_edge GTY((chain_next ("%h.next_caller"), chain_prev ("%h.prev_caller")))
+{
+ struct cgraph_node *caller;
+ struct cgraph_node *callee;
+ struct cgraph_edge *prev_caller;
+ struct cgraph_edge *next_caller;
+ struct cgraph_edge *prev_callee;
+ struct cgraph_edge *next_callee;
+ tree call_stmt;
+ PTR GTY ((skip (""))) aux;
+ /* When NULL, inline this call. When non-NULL, points to the explanation
+ why function was not inlined. */
+ const char *inline_failed;
+ /* Expected number of executions: calculated in profile.c. */
+ gcov_type count;
+ /* Depth of loop nest, 1 means no loop nest. */
+ int loop_nest;
+};
+
+typedef struct cgraph_edge *cgraph_edge_p;
+
+DEF_VEC_P(cgraph_edge_p);
+DEF_VEC_ALLOC_P(cgraph_edge_p,heap);
+
+/* The cgraph_varpool data structure.
+ Each static variable decl has assigned cgraph_varpool_node. */
+
+struct cgraph_varpool_node GTY(())
+{
+ tree decl;
+ /* Pointer to the next function in cgraph_varpool_nodes. */
+ struct cgraph_varpool_node *next;
+ /* Pointer to the next function in cgraph_varpool_nodes_queue. */
+ struct cgraph_varpool_node *next_needed;
+ /* Ordering of all cgraph nodes. */
+ int order;
+
+ /* Set when function must be output - it is externally visible
+ or its address is taken. */
+ unsigned needed : 1;
+ /* Needed variables might become dead by optimization. This flag
+ forces the variable to be output even if it appears dead otherwise. */
+ unsigned force_output : 1;
+ /* Set once the variable has been instantiated and its callee
+ lists created. */
+ unsigned analyzed : 1;
+ /* Set once it has been finalized so we consider it to be output. */
+ unsigned finalized : 1;
+ /* Set when variable is scheduled to be assembled. */
+ unsigned output : 1;
+ /* Set when function is visible by other units. */
+ unsigned externally_visible : 1;
+ /* Set for aliases once they got through assemble_alias. */
+ unsigned alias : 1;
+};
+
+/* Every top level asm statement is put into a cgraph_asm_node. */
+
+struct cgraph_asm_node GTY(())
+{
+ /* Next asm node. */
+ struct cgraph_asm_node *next;
+ /* String for this asm node. */
+ tree asm_str;
+ /* Ordering of all cgraph nodes. */
+ int order;
+};
+
+extern GTY(()) struct cgraph_node *cgraph_nodes;
+extern GTY(()) int cgraph_n_nodes;
+extern GTY(()) int cgraph_max_uid;
+extern bool cgraph_global_info_ready;
+extern bool cgraph_function_flags_ready;
+extern GTY(()) struct cgraph_node *cgraph_nodes_queue;
+extern GTY(()) struct cgraph_node *cgraph_expand_queue;
+
+extern GTY(()) struct cgraph_varpool_node *cgraph_varpool_first_unanalyzed_node;
+extern GTY(()) struct cgraph_varpool_node *cgraph_varpool_last_needed_node;
+extern GTY(()) struct cgraph_varpool_node *cgraph_varpool_nodes_queue;
+extern GTY(()) struct cgraph_varpool_node *cgraph_varpool_nodes;
+extern GTY(()) struct cgraph_asm_node *cgraph_asm_nodes;
+extern GTY(()) int cgraph_order;
+
+/* In cgraph.c */
+void dump_cgraph (FILE *);
+void dump_cgraph_node (FILE *, struct cgraph_node *);
+void cgraph_insert_node_to_hashtable (struct cgraph_node *node);
+void dump_varpool (FILE *);
+void dump_cgraph_varpool_node (FILE *, struct cgraph_varpool_node *);
+void cgraph_remove_edge (struct cgraph_edge *);
+void cgraph_remove_node (struct cgraph_node *);
+void cgraph_node_remove_callees (struct cgraph_node *node);
+struct cgraph_edge *cgraph_create_edge (struct cgraph_node *,
+ struct cgraph_node *,
+ tree, gcov_type, int);
+struct cgraph_node *cgraph_node (tree);
+struct cgraph_node *cgraph_node_for_asm (tree asmname);
+struct cgraph_edge *cgraph_edge (struct cgraph_node *, tree);
+void cgraph_set_call_stmt (struct cgraph_edge *, tree);
+struct cgraph_local_info *cgraph_local_info (tree);
+struct cgraph_global_info *cgraph_global_info (tree);
+struct cgraph_rtl_info *cgraph_rtl_info (tree);
+const char * cgraph_node_name (struct cgraph_node *);
+struct cgraph_edge * cgraph_clone_edge (struct cgraph_edge *,
+ struct cgraph_node *,
+ tree, gcov_type, int, bool);
+struct cgraph_node * cgraph_clone_node (struct cgraph_node *, gcov_type,
+ int, bool);
+
+struct cgraph_varpool_node *cgraph_varpool_node (tree);
+struct cgraph_varpool_node *cgraph_varpool_node_for_asm (tree asmname);
+void cgraph_varpool_mark_needed_node (struct cgraph_varpool_node *);
+void cgraph_varpool_finalize_decl (tree);
+void cgraph_redirect_edge_callee (struct cgraph_edge *, struct cgraph_node *);
+
+struct cgraph_asm_node *cgraph_add_asm_node (tree);
+
+bool cgraph_function_possibly_inlined_p (tree);
+void cgraph_unnest_node (struct cgraph_node *);
+void cgraph_varpool_enqueue_needed_node (struct cgraph_varpool_node *);
+void cgraph_varpool_reset_queue (void);
+bool decide_is_variable_needed (struct cgraph_varpool_node *, tree);
+
+enum availability cgraph_function_body_availability (struct cgraph_node *);
+enum availability cgraph_variable_initializer_availability (struct cgraph_varpool_node *);
+bool cgraph_is_master_clone (struct cgraph_node *);
+struct cgraph_node *cgraph_master_clone (struct cgraph_node *);
+void cgraph_add_new_function (tree);
+
+/* In cgraphunit.c */
+/* APPLE LOCAL radar 6305545 */
+void lower_if_nested_functions (tree);
+bool cgraph_assemble_pending_functions (void);
+bool cgraph_varpool_assemble_pending_decls (void);
+void cgraph_finalize_function (tree, bool);
+void cgraph_finalize_compilation_unit (void);
+void cgraph_optimize (void);
+void cgraph_mark_needed_node (struct cgraph_node *);
+void cgraph_mark_reachable_node (struct cgraph_node *);
+bool cgraph_inline_p (struct cgraph_edge *, const char **reason);
+bool cgraph_preserve_function_body_p (tree);
+void verify_cgraph (void);
+void verify_cgraph_node (struct cgraph_node *);
+void cgraph_build_static_cdtor (char which, tree body, int priority);
+void cgraph_reset_static_var_maps (void);
+void init_cgraph (void);
+struct cgraph_node *cgraph_function_versioning (struct cgraph_node *,
+ VEC(cgraph_edge_p,heap)*,
+ varray_type);
+void cgraph_analyze_function (struct cgraph_node *);
+struct cgraph_node *save_inline_function_body (struct cgraph_node *);
+
+/* In ipa.c */
+bool cgraph_remove_unreachable_nodes (bool, FILE *);
+int cgraph_postorder (struct cgraph_node **);
+
+/* In ipa-inline.c */
+bool cgraph_decide_inlining_incrementally (struct cgraph_node *, bool);
+void cgraph_clone_inlined_nodes (struct cgraph_edge *, bool, bool);
+void cgraph_mark_inline_edge (struct cgraph_edge *, bool);
+bool cgraph_default_inline_p (struct cgraph_node *, const char **);
+#endif /* GCC_CGRAPH_H */