6614fd40d2
* alias.c: Fix comment formatting. * alloc-pool.c: Likewise. * bitmap.c: Likewise. * bitmap.h: Likewise. * bt-load.c: Likewise. * c-common.c: Likewise. * c-common.h: Likewise. * c-decl.c: Likewise. * c-opts.c: Likewise. * c-pretty-print.c: Likewise. * caller-save.c: Likewise. * cfghooks.h: Likewise. * cgraph.c: Likewise. * collect2.c: Likewise. * cppfiles.c: Likewise. * cpplib.h: Likewise. * dwarf2out.c: Likewise. * dwarfout.c: Likewise. * emit-rtl.c: Likewise. * final.c: Likewise. * function.c: Likewise. * gcov.c: Likewise. * gcse.c: Likewise. * genemit.c: Likewise. * ggc.h: Likewise. * haifa-sched.c: Likewise. * ifcvt.c: Likewise. * libgcc2.h: Likewise. * loop.c: Likewise. * predict.h: Likewise. * unwind-libunwind.c: Likewise. * varasm.c: Likewise. From-SVN: r74907
621 lines
16 KiB
C
621 lines
16 KiB
C
/* Callgraph handling code.
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Copyright (C) 2003 Free Software Foundation, Inc.
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Contributed by Jan Hubicka
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "tree.h"
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#include "langhooks.h"
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#include "hashtab.h"
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#include "toplev.h"
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#include "flags.h"
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#include "ggc.h"
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#include "debug.h"
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#include "target.h"
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#include "cgraph.h"
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#include "varray.h"
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#include "output.h"
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/* Hash table used to convert declarations into nodes. */
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static GTY((param_is (struct cgraph_node))) htab_t cgraph_hash;
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/* The linked list of cgraph nodes. */
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struct cgraph_node *cgraph_nodes;
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/* Queue of cgraph nodes scheduled to be lowered. */
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struct cgraph_node *cgraph_nodes_queue;
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/* Number of nodes in existence. */
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int cgraph_n_nodes;
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/* Maximal uid used in cgraph nodes. */
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int cgraph_max_uid;
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/* Set when whole unit has been analyzed so we can access global info. */
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bool cgraph_global_info_ready = false;
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/* Hash table used to convert declarations into nodes. */
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static GTY((param_is (struct cgraph_varpool_node))) htab_t cgraph_varpool_hash;
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/* Queue of cgraph nodes scheduled to be lowered and output. */
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struct cgraph_varpool_node *cgraph_varpool_nodes_queue;
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/* Number of nodes in existence. */
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int cgraph_varpool_n_nodes;
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/* The linked list of cgraph varpool nodes. */
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static GTY(()) struct cgraph_varpool_node *cgraph_varpool_nodes;
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static struct cgraph_edge *create_edge (struct cgraph_node *,
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struct cgraph_node *);
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static hashval_t hash_node (const void *);
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static int eq_node (const void *, const void *);
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/* Returns a hash code for P. */
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static hashval_t
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hash_node (const void *p)
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{
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return ((hashval_t)
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IDENTIFIER_HASH_VALUE (DECL_ASSEMBLER_NAME
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(((struct cgraph_node *) p)->decl)));
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}
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/* Returns nonzero if P1 and P2 are equal. */
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static int
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eq_node (const void *p1, const void *p2)
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{
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return ((DECL_ASSEMBLER_NAME (((struct cgraph_node *) p1)->decl)) ==
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(tree) p2);
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}
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/* Return cgraph node assigned to DECL. Create new one when needed. */
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struct cgraph_node *
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cgraph_node (tree decl)
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{
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struct cgraph_node *node;
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struct cgraph_node **slot;
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if (TREE_CODE (decl) != FUNCTION_DECL)
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abort ();
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if (!cgraph_hash)
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cgraph_hash = htab_create_ggc (10, hash_node, eq_node, NULL);
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slot = (struct cgraph_node **)
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htab_find_slot_with_hash (cgraph_hash, DECL_ASSEMBLER_NAME (decl),
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IDENTIFIER_HASH_VALUE
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(DECL_ASSEMBLER_NAME (decl)), INSERT);
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if (*slot)
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return *slot;
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node = ggc_alloc_cleared (sizeof (*node));
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node->decl = decl;
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node->next = cgraph_nodes;
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node->uid = cgraph_max_uid++;
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if (cgraph_nodes)
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cgraph_nodes->previous = node;
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node->previous = NULL;
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cgraph_nodes = node;
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cgraph_n_nodes++;
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*slot = node;
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if (DECL_CONTEXT (decl) && TREE_CODE (DECL_CONTEXT (decl)) == FUNCTION_DECL)
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{
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node->origin = cgraph_node (DECL_CONTEXT (decl));
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node->next_nested = node->origin->nested;
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node->origin->nested = node;
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}
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return node;
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}
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/* Try to find existing function for identifier ID. */
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struct cgraph_node *
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cgraph_node_for_identifier (tree id)
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{
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struct cgraph_node **slot;
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if (TREE_CODE (id) != IDENTIFIER_NODE)
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abort ();
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if (!cgraph_hash)
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return NULL;
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slot = (struct cgraph_node **)
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htab_find_slot_with_hash (cgraph_hash, id,
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IDENTIFIER_HASH_VALUE (id), NO_INSERT);
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if (!slot)
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return NULL;
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return *slot;
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}
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/* Create edge from CALLER to CALLEE in the cgraph. */
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static struct cgraph_edge *
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create_edge (struct cgraph_node *caller, struct cgraph_node *callee)
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{
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struct cgraph_edge *edge = ggc_alloc (sizeof (struct cgraph_edge));
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struct cgraph_edge *edge2;
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edge->inline_call = false;
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/* At the moment we don't associate calls with specific CALL_EXPRs
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as we probably ought to, so we must preserve inline_call flags to
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be the same in all copies of the same edge. */
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if (cgraph_global_info_ready)
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for (edge2 = caller->callees; edge2; edge2 = edge2->next_callee)
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if (edge2->callee == callee)
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{
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edge->inline_call = edge2->inline_call;
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break;
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}
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edge->caller = caller;
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edge->callee = callee;
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edge->next_caller = callee->callers;
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edge->next_callee = caller->callees;
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caller->callees = edge;
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callee->callers = edge;
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return edge;
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}
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/* Remove the edge from CALLER to CALLEE in the cgraph. */
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void
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cgraph_remove_edge (struct cgraph_node *caller, struct cgraph_node *callee)
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{
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struct cgraph_edge **edge, **edge2;
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for (edge = &callee->callers; *edge && (*edge)->caller != caller;
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edge = &((*edge)->next_caller))
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continue;
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if (!*edge)
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abort ();
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*edge = (*edge)->next_caller;
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for (edge2 = &caller->callees; *edge2 && (*edge2)->callee != callee;
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edge2 = &(*edge2)->next_callee)
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continue;
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if (!*edge2)
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abort ();
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*edge2 = (*edge2)->next_callee;
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}
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/* Remove the node from cgraph. */
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void
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cgraph_remove_node (struct cgraph_node *node)
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{
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void **slot;
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while (node->callers)
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cgraph_remove_edge (node->callers->caller, node);
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while (node->callees)
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cgraph_remove_edge (node, node->callees->callee);
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while (node->nested)
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cgraph_remove_node (node->nested);
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if (node->origin)
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{
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struct cgraph_node **node2 = &node->origin->nested;
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while (*node2 != node)
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node2 = &(*node2)->next_nested;
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*node2 = node->next_nested;
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}
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if (node->previous)
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node->previous->next = node->next;
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else
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cgraph_nodes = node;
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if (node->next)
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node->next->previous = node->previous;
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DECL_SAVED_TREE (node->decl) = NULL;
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slot =
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htab_find_slot_with_hash (cgraph_hash, DECL_ASSEMBLER_NAME (node->decl),
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IDENTIFIER_HASH_VALUE (DECL_ASSEMBLER_NAME
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(node->decl)), NO_INSERT);
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htab_clear_slot (cgraph_hash, slot);
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/* Do not free the structure itself so the walk over chain can continue. */
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}
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/* Notify finalize_compilation_unit that given node is reachable. */
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void
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cgraph_mark_reachable_node (struct cgraph_node *node)
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{
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if (!node->reachable && node->local.finalized)
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{
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notice_global_symbol (node->decl);
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node->reachable = 1;
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node->next_needed = cgraph_nodes_queue;
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cgraph_nodes_queue = node;
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/* At the moment frontend automatically emits all nested functions. */
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if (node->nested)
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{
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struct cgraph_node *node2;
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for (node2 = node->nested; node2; node2 = node2->next_nested)
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if (!node2->reachable)
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cgraph_mark_reachable_node (node2);
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}
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}
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}
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/* Likewise indicate that a node is needed, i.e. reachable via some
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external means. */
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void
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cgraph_mark_needed_node (struct cgraph_node *node)
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{
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node->needed = 1;
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cgraph_mark_reachable_node (node);
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}
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/* Record call from CALLER to CALLEE. */
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struct cgraph_edge *
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cgraph_record_call (tree caller, tree callee)
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{
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return create_edge (cgraph_node (caller), cgraph_node (callee));
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}
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void
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cgraph_remove_call (tree caller, tree callee)
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{
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cgraph_remove_edge (cgraph_node (caller), cgraph_node (callee));
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}
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/* Return true when CALLER_DECL calls CALLEE_DECL. */
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bool
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cgraph_calls_p (tree caller_decl, tree callee_decl)
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{
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struct cgraph_node *caller = cgraph_node (caller_decl);
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struct cgraph_node *callee = cgraph_node (callee_decl);
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struct cgraph_edge *edge;
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for (edge = callee->callers; edge && (edge)->caller != caller;
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edge = (edge->next_caller))
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continue;
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return edge != NULL;
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}
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/* Return local info for the compiled function. */
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struct cgraph_local_info *
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cgraph_local_info (tree decl)
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{
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struct cgraph_node *node;
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if (TREE_CODE (decl) != FUNCTION_DECL)
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abort ();
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node = cgraph_node (decl);
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return &node->local;
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}
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/* Return local info for the compiled function. */
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struct cgraph_global_info *
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cgraph_global_info (tree decl)
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{
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struct cgraph_node *node;
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if (TREE_CODE (decl) != FUNCTION_DECL || !cgraph_global_info_ready)
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abort ();
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node = cgraph_node (decl);
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return &node->global;
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}
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/* Return local info for the compiled function. */
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struct cgraph_rtl_info *
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cgraph_rtl_info (tree decl)
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{
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struct cgraph_node *node;
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if (TREE_CODE (decl) != FUNCTION_DECL)
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abort ();
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node = cgraph_node (decl);
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if (decl != current_function_decl
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&& !TREE_ASM_WRITTEN (node->decl))
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return NULL;
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return &node->rtl;
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}
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/* Return name of the node used in debug output. */
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const char *
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cgraph_node_name (struct cgraph_node *node)
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{
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return (*lang_hooks.decl_printable_name) (node->decl, 2);
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}
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/* Dump the callgraph. */
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void
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dump_cgraph (FILE *f)
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{
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struct cgraph_node *node;
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fprintf (f, "callgraph:\n\n");
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for (node = cgraph_nodes; node; node = node->next)
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{
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struct cgraph_edge *edge;
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fprintf (f, "%s:", cgraph_node_name (node));
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if (node->local.self_insns)
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fprintf (f, " %i insns", node->local.self_insns);
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if (node->global.insns && node->global.insns != node->local.self_insns)
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fprintf (f, " (%i after inlining)", node->global.insns);
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if (node->origin)
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fprintf (f, " nested in: %s", cgraph_node_name (node->origin));
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if (node->needed)
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fprintf (f, " needed");
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else if (node->reachable)
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fprintf (f, " reachable");
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if (DECL_SAVED_TREE (node->decl))
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fprintf (f, " tree");
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if (node->local.local)
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fprintf (f, " local");
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if (node->local.disregard_inline_limits)
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fprintf (f, " always_inline");
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else if (node->local.inlinable)
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fprintf (f, " inlinable");
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if (node->global.cloned_times > 1)
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fprintf (f, " cloned %ix", node->global.cloned_times);
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fprintf (f, "\n called by: ");
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for (edge = node->callers; edge; edge = edge->next_caller)
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{
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fprintf (f, "%s ", cgraph_node_name (edge->caller));
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if (edge->inline_call)
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fprintf(f, "(inlined) ");
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}
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fprintf (f, "\n calls: ");
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for (edge = node->callees; edge; edge = edge->next_callee)
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{
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fprintf (f, "%s ", cgraph_node_name (edge->callee));
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if (edge->inline_call)
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fprintf(f, "(inlined) ");
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}
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fprintf (f, "\n");
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}
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}
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|
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/* Returns a hash code for P. */
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static hashval_t
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cgraph_varpool_hash_node (const void *p)
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{
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return ((hashval_t)
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IDENTIFIER_HASH_VALUE (DECL_ASSEMBLER_NAME
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(((struct cgraph_varpool_node *) p)->decl)));
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}
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|
|
/* Returns nonzero if P1 and P2 are equal. */
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|
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static int
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eq_cgraph_varpool_node (const void *p1, const void *p2)
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{
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return ((DECL_ASSEMBLER_NAME (((struct cgraph_varpool_node *) p1)->decl)) ==
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(tree) p2);
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}
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|
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/* Return cgraph_varpool node assigned to DECL. Create new one when needed. */
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struct cgraph_varpool_node *
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cgraph_varpool_node (tree decl)
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{
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struct cgraph_varpool_node *node;
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struct cgraph_varpool_node **slot;
|
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|
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if (!DECL_P (decl) || TREE_CODE (decl) == FUNCTION_DECL)
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abort ();
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|
|
|
if (!cgraph_varpool_hash)
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cgraph_varpool_hash = htab_create_ggc (10, cgraph_varpool_hash_node,
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eq_cgraph_varpool_node, NULL);
|
|
slot = (struct cgraph_varpool_node **)
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|
htab_find_slot_with_hash (cgraph_varpool_hash, DECL_ASSEMBLER_NAME (decl),
|
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IDENTIFIER_HASH_VALUE (DECL_ASSEMBLER_NAME (decl)),
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INSERT);
|
|
if (*slot)
|
|
return *slot;
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node = ggc_alloc_cleared (sizeof (*node));
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node->decl = decl;
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cgraph_varpool_n_nodes++;
|
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cgraph_varpool_nodes = node;
|
|
*slot = node;
|
|
return node;
|
|
}
|
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|
|
/* Set the DECL_ASSEMBLER_NAME and update cgraph hashtables. */
|
|
void
|
|
change_decl_assembler_name (tree decl, tree name)
|
|
{
|
|
struct cgraph_node *node = NULL;
|
|
struct cgraph_varpool_node *vnode = NULL;
|
|
void **slot;
|
|
|
|
if (!DECL_ASSEMBLER_NAME_SET_P (decl))
|
|
{
|
|
SET_DECL_ASSEMBLER_NAME (decl, name);
|
|
return;
|
|
}
|
|
if (name == DECL_ASSEMBLER_NAME (decl))
|
|
return;
|
|
|
|
if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
|
|
&& DECL_RTL_SET_P (decl))
|
|
warning ("%D renamed after being referenced in assembly", decl);
|
|
|
|
if (TREE_CODE (decl) == FUNCTION_DECL && cgraph_hash)
|
|
{
|
|
/* Take a look whether declaration is in the cgraph structure. */
|
|
slot =
|
|
htab_find_slot_with_hash (cgraph_hash, DECL_ASSEMBLER_NAME (decl),
|
|
IDENTIFIER_HASH_VALUE (DECL_ASSEMBLER_NAME
|
|
(decl)), NO_INSERT);
|
|
if (slot)
|
|
node = *slot;
|
|
|
|
/* It is, verify that we are the canonical node for this decl. */
|
|
if (node && node->decl == decl)
|
|
{
|
|
node = *slot;
|
|
htab_clear_slot (cgraph_hash, slot);
|
|
}
|
|
else
|
|
node = NULL;
|
|
}
|
|
if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl) && cgraph_varpool_hash)
|
|
{
|
|
/* Take a look whether declaration is in the cgraph structure. */
|
|
slot =
|
|
htab_find_slot_with_hash (cgraph_varpool_hash, DECL_ASSEMBLER_NAME (decl),
|
|
IDENTIFIER_HASH_VALUE (DECL_ASSEMBLER_NAME
|
|
(decl)), NO_INSERT);
|
|
if (slot)
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|
vnode = *slot;
|
|
|
|
/* It is, verify that we are the canonical vnode for this decl. */
|
|
if (vnode && vnode->decl == decl)
|
|
{
|
|
vnode = *slot;
|
|
htab_clear_slot (cgraph_varpool_hash, slot);
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|
}
|
|
else
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|
vnode = NULL;
|
|
}
|
|
SET_DECL_ASSEMBLER_NAME (decl, name);
|
|
if (node)
|
|
{
|
|
slot =
|
|
htab_find_slot_with_hash (cgraph_hash, name,
|
|
IDENTIFIER_HASH_VALUE (name), INSERT);
|
|
if (*slot)
|
|
abort ();
|
|
*slot = node;
|
|
}
|
|
if (vnode)
|
|
{
|
|
slot =
|
|
htab_find_slot_with_hash (cgraph_varpool_hash, name,
|
|
IDENTIFIER_HASH_VALUE (name), INSERT);
|
|
if (*slot)
|
|
abort ();
|
|
*slot = vnode;
|
|
}
|
|
}
|
|
|
|
/* Try to find existing function for identifier ID. */
|
|
struct cgraph_varpool_node *
|
|
cgraph_varpool_node_for_identifier (tree id)
|
|
{
|
|
struct cgraph_varpool_node **slot;
|
|
|
|
if (TREE_CODE (id) != IDENTIFIER_NODE)
|
|
abort ();
|
|
|
|
if (!cgraph_varpool_hash)
|
|
return NULL;
|
|
|
|
slot = (struct cgraph_varpool_node **)
|
|
htab_find_slot_with_hash (cgraph_varpool_hash, id,
|
|
IDENTIFIER_HASH_VALUE (id), NO_INSERT);
|
|
if (!slot)
|
|
return NULL;
|
|
return *slot;
|
|
}
|
|
|
|
/* Notify finalize_compilation_unit that given node is reachable
|
|
or needed. */
|
|
void
|
|
cgraph_varpool_mark_needed_node (struct cgraph_varpool_node *node)
|
|
{
|
|
if (!node->needed && node->finalized)
|
|
{
|
|
node->next_needed = cgraph_varpool_nodes_queue;
|
|
cgraph_varpool_nodes_queue = node;
|
|
notice_global_symbol (node->decl);
|
|
}
|
|
node->needed = 1;
|
|
}
|
|
|
|
void
|
|
cgraph_varpool_finalize_decl (tree decl)
|
|
{
|
|
struct cgraph_varpool_node *node = cgraph_varpool_node (decl);
|
|
|
|
/* The first declaration of a variable that comes through this function
|
|
decides whether it is global (in C, has external linkage)
|
|
or local (in C, has internal linkage). So do nothing more
|
|
if this function has already run. */
|
|
if (node->finalized)
|
|
return;
|
|
if (node->needed)
|
|
{
|
|
node->next_needed = cgraph_varpool_nodes_queue;
|
|
cgraph_varpool_nodes_queue = node;
|
|
notice_global_symbol (decl);
|
|
}
|
|
node->finalized = true;
|
|
|
|
if (/* Externally visible variables must be output. The exception are
|
|
COMDAT functions that must be output only when they are needed. */
|
|
(TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
|
|
/* Function whose name is output to the assembler file must be produced.
|
|
It is possible to assemble the name later after finalizing the function
|
|
and the fact is noticed in assemble_name then. */
|
|
|| (DECL_ASSEMBLER_NAME_SET_P (decl)
|
|
&& TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
|
|
{
|
|
cgraph_varpool_mark_needed_node (node);
|
|
}
|
|
}
|
|
|
|
bool
|
|
cgraph_varpool_assemble_pending_decls (void)
|
|
{
|
|
bool changed = false;
|
|
|
|
while (cgraph_varpool_nodes_queue)
|
|
{
|
|
tree decl = cgraph_varpool_nodes_queue->decl;
|
|
struct cgraph_varpool_node *node = cgraph_varpool_nodes_queue;
|
|
|
|
cgraph_varpool_nodes_queue = cgraph_varpool_nodes_queue->next_needed;
|
|
if (!TREE_ASM_WRITTEN (decl))
|
|
{
|
|
assemble_variable (decl, 0, 1, 0);
|
|
changed = true;
|
|
}
|
|
node->next_needed = NULL;
|
|
}
|
|
return changed;
|
|
}
|
|
|
|
/* Return true when the DECL can possibly be inlined. */
|
|
bool
|
|
cgraph_function_possibly_inlined_p (tree decl)
|
|
{
|
|
if (!cgraph_global_info_ready)
|
|
return (DECL_INLINE (decl) && !flag_really_no_inline);
|
|
return cgraph_node (decl)->global.inlined;
|
|
}
|
|
|
|
#include "gt-cgraph.h"
|