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-rw-r--r--binutils-2.25/gprof/cg_dfn.c303
1 files changed, 303 insertions, 0 deletions
diff --git a/binutils-2.25/gprof/cg_dfn.c b/binutils-2.25/gprof/cg_dfn.c
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+++ b/binutils-2.25/gprof/cg_dfn.c
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+/*
+ * Copyright (c) 1983, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#include "gprof.h"
+#include "libiberty.h"
+#include "search_list.h"
+#include "source.h"
+#include "symtab.h"
+#include "cg_arcs.h"
+#include "cg_dfn.h"
+#include "utils.h"
+
+#define DFN_INCR_DEPTH (128)
+
+typedef struct
+ {
+ Sym *sym;
+ int cycle_top;
+ }
+DFN_Stack;
+
+static bfd_boolean is_numbered (Sym *);
+static bfd_boolean is_busy (Sym *);
+static void find_cycle (Sym *);
+static void pre_visit (Sym *);
+static void post_visit (Sym *);
+
+DFN_Stack *dfn_stack = NULL;
+int dfn_maxdepth = 0;
+int dfn_depth = 0;
+int dfn_counter = DFN_NAN;
+
+
+/*
+ * Is CHILD already numbered?
+ */
+static bfd_boolean
+is_numbered (Sym *child)
+{
+ return child->cg.top_order != DFN_NAN && child->cg.top_order != DFN_BUSY;
+}
+
+
+/*
+ * Is CHILD already busy?
+ */
+static bfd_boolean
+is_busy (Sym *child)
+{
+ if (child->cg.top_order == DFN_NAN)
+ {
+ return FALSE;
+ }
+ return TRUE;
+}
+
+
+/*
+ * CHILD is part of a cycle. Find the top caller into this cycle
+ * that is not part of the cycle and make all functions in cycle
+ * members of that cycle (top caller == caller with smallest
+ * depth-first number).
+ */
+static void
+find_cycle (Sym *child)
+{
+ Sym *head = 0;
+ Sym *tail;
+ int cycle_top;
+ int cycle_index;
+
+ for (cycle_top = dfn_depth; cycle_top > 0; --cycle_top)
+ {
+ head = dfn_stack[cycle_top].sym;
+ if (child == head)
+ {
+ break;
+ }
+ if (child->cg.cyc.head != child && child->cg.cyc.head == head)
+ {
+ break;
+ }
+ }
+ if (cycle_top <= 0)
+ {
+ fprintf (stderr, "[find_cycle] couldn't find head of cycle\n");
+ done (1);
+ }
+#ifdef DEBUG
+ if (debug_level & DFNDEBUG)
+ {
+ printf ("[find_cycle] dfn_depth %d cycle_top %d ",
+ dfn_depth, cycle_top);
+ if (head)
+ {
+ print_name (head);
+ }
+ else
+ {
+ printf ("<unknown>");
+ }
+ printf ("\n");
+ }
+#endif
+ if (cycle_top == dfn_depth)
+ {
+ /*
+ * This is previous function, e.g. this calls itself. Sort of
+ * boring.
+ *
+ * Since we are taking out self-cycles elsewhere no need for
+ * the special case, here.
+ */
+ DBG (DFNDEBUG,
+ printf ("[find_cycle] ");
+ print_name (child);
+ printf ("\n"));
+ }
+ else
+ {
+ /*
+ * Glom intervening functions that aren't already glommed into
+ * this cycle. Things have been glommed when their cyclehead
+ * field points to the head of the cycle they are glommed
+ * into.
+ */
+ for (tail = head; tail->cg.cyc.next; tail = tail->cg.cyc.next)
+ {
+ /* void: chase down to tail of things already glommed */
+ DBG (DFNDEBUG,
+ printf ("[find_cycle] tail ");
+ print_name (tail);
+ printf ("\n"));
+ }
+ /*
+ * If what we think is the top of the cycle has a cyclehead
+ * field, then it's not really the head of the cycle, which is
+ * really what we want.
+ */
+ if (head->cg.cyc.head != head)
+ {
+ head = head->cg.cyc.head;
+ DBG (DFNDEBUG, printf ("[find_cycle] new cyclehead ");
+ print_name (head);
+ printf ("\n"));
+ }
+ for (cycle_index = cycle_top + 1; cycle_index <= dfn_depth; ++cycle_index)
+ {
+ child = dfn_stack[cycle_index].sym;
+ if (child->cg.cyc.head == child)
+ {
+ /*
+ * Not yet glommed anywhere, glom it and fix any
+ * children it has glommed.
+ */
+ tail->cg.cyc.next = child;
+ child->cg.cyc.head = head;
+ DBG (DFNDEBUG, printf ("[find_cycle] glomming ");
+ print_name (child);
+ printf (" onto ");
+ print_name (head);
+ printf ("\n"));
+ for (tail = child; tail->cg.cyc.next; tail = tail->cg.cyc.next)
+ {
+ tail->cg.cyc.next->cg.cyc.head = head;
+ DBG (DFNDEBUG, printf ("[find_cycle] and its tail ");
+ print_name (tail->cg.cyc.next);
+ printf (" onto ");
+ print_name (head);
+ printf ("\n"));
+ }
+ }
+ else if (child->cg.cyc.head != head /* firewall */ )
+ {
+ fprintf (stderr, "[find_cycle] glommed, but not to head\n");
+ done (1);
+ }
+ }
+ }
+}
+
+
+/*
+ * Prepare for visiting the children of PARENT. Push a parent onto
+ * the stack and mark it busy.
+ */
+static void
+pre_visit (Sym *parent)
+{
+ ++dfn_depth;
+
+ if (dfn_depth >= dfn_maxdepth)
+ {
+ dfn_maxdepth += DFN_INCR_DEPTH;
+ dfn_stack = (DFN_Stack *) xrealloc (dfn_stack,
+ dfn_maxdepth * sizeof *dfn_stack);
+ }
+
+ dfn_stack[dfn_depth].sym = parent;
+ dfn_stack[dfn_depth].cycle_top = dfn_depth;
+ parent->cg.top_order = DFN_BUSY;
+ DBG (DFNDEBUG, printf ("[pre_visit]\t\t%d:", dfn_depth);
+ print_name (parent);
+ printf ("\n"));
+}
+
+
+/*
+ * Done with visiting node PARENT. Pop PARENT off dfn_stack
+ * and number functions if PARENT is head of a cycle.
+ */
+static void
+post_visit (Sym *parent)
+{
+ Sym *member;
+
+ DBG (DFNDEBUG, printf ("[post_visit]\t%d: ", dfn_depth);
+ print_name (parent);
+ printf ("\n"));
+ /*
+ * Number functions and things in their cycles unless the function
+ * is itself part of a cycle:
+ */
+ if (parent->cg.cyc.head == parent)
+ {
+ ++dfn_counter;
+ for (member = parent; member; member = member->cg.cyc.next)
+ {
+ member->cg.top_order = dfn_counter;
+ DBG (DFNDEBUG, printf ("[post_visit]\t\tmember ");
+ print_name (member);
+ printf ("-> cg.top_order = %d\n", dfn_counter));
+ }
+ }
+ else
+ {
+ DBG (DFNDEBUG, printf ("[post_visit]\t\tis part of a cycle\n"));
+ }
+ --dfn_depth;
+}
+
+
+/*
+ * Given this PARENT, depth first number its children.
+ */
+void
+cg_dfn (Sym *parent)
+{
+ Arc *arc;
+
+ DBG (DFNDEBUG, printf ("[dfn] dfn( ");
+ print_name (parent);
+ printf (")\n"));
+ /*
+ * If we're already numbered, no need to look any further:
+ */
+ if (is_numbered (parent))
+ {
+ return;
+ }
+ /*
+ * If we're already busy, must be a cycle:
+ */
+ if (is_busy (parent))
+ {
+ find_cycle (parent);
+ return;
+ }
+ pre_visit (parent);
+ /*
+ * Recursively visit children:
+ */
+ for (arc = parent->cg.children; arc; arc = arc->next_child)
+ {
+ cg_dfn (arc->child);
+ }
+ post_visit (parent);
+}
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