131 lines
3.9 KiB
C
131 lines
3.9 KiB
C
/* call_graph.c - Create call graphs.
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Copyright (C) 1999-2019 Free Software Foundation, Inc.
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This file is part of GNU Binutils.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License 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 this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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#include "gprof.h"
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#include "search_list.h"
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#include "source.h"
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#include "symtab.h"
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#include "cg_arcs.h"
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#include "call_graph.h"
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#include "corefile.h"
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#include "gmon_io.h"
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#include "gmon_out.h"
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#include "sym_ids.h"
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void
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cg_tally (bfd_vma from_pc, bfd_vma self_pc, unsigned long count)
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{
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Sym *parent;
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Sym *child;
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parent = sym_lookup (&symtab, from_pc);
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child = sym_lookup (&symtab, self_pc);
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if (child == NULL || parent == NULL)
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return;
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/* If we're doing line-by-line profiling, both the parent and the
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child will probably point to line symbols instead of function
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symbols. For the parent this is fine, since this identifies the
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line number in the calling routing, but the child should always
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point to a function entry point, so we back up in the symbol
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table until we find it.
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For normal profiling, is_func will be set on all symbols, so this
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code will do nothing. */
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while (child >= symtab.base && ! child->is_func)
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--child;
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if (child < symtab.base)
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return;
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/* Keep arc if it is on INCL_ARCS table or if the INCL_ARCS table
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is empty and it is not in the EXCL_ARCS table. */
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if (sym_id_arc_is_present (&syms[INCL_ARCS], parent, child)
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|| (syms[INCL_ARCS].len == 0
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&& !sym_id_arc_is_present (&syms[EXCL_ARCS], parent, child)))
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{
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child->ncalls += count;
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DBG (TALLYDEBUG,
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printf (_("[cg_tally] arc from %s to %s traversed %lu times\n"),
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parent->name, child->name, count));
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arc_add (parent, child, count);
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}
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}
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/* Read a record from file IFP describing an arc in the function
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call-graph and the count of how many times the arc has been
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traversed. FILENAME is the name of file IFP and is provided
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for formatting error-messages only. */
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void
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cg_read_rec (FILE *ifp, const char *filename)
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{
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bfd_vma from_pc, self_pc;
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unsigned int count;
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if (gmon_io_read_vma (ifp, &from_pc)
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|| gmon_io_read_vma (ifp, &self_pc)
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|| gmon_io_read_32 (ifp, &count))
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{
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fprintf (stderr, _("%s: %s: unexpected end of file\n"),
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whoami, filename);
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done (1);
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}
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DBG (SAMPLEDEBUG,
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printf ("[cg_read_rec] frompc 0x%lx selfpc 0x%lx count %lu\n",
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(unsigned long) from_pc, (unsigned long) self_pc,
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(unsigned long) count));
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/* Add this arc: */
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cg_tally (from_pc, self_pc, count);
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}
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/* Write all the arcs in the call-graph to file OFP. FILENAME is
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the name of OFP and is provided for formatting error-messages
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only. */
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void
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cg_write_arcs (FILE *ofp, const char *filename)
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{
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Arc *arc;
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Sym *sym;
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for (sym = symtab.base; sym < symtab.limit; sym++)
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{
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for (arc = sym->cg.children; arc; arc = arc->next_child)
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{
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if (gmon_io_write_8 (ofp, GMON_TAG_CG_ARC)
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|| gmon_io_write_vma (ofp, arc->parent->addr)
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|| gmon_io_write_vma (ofp, arc->child->addr)
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|| gmon_io_write_32 (ofp, arc->count))
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{
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perror (filename);
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done (1);
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}
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DBG (SAMPLEDEBUG,
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printf ("[cg_write_arcs] frompc 0x%lx selfpc 0x%lx count %lu\n",
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(unsigned long) arc->parent->addr,
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(unsigned long) arc->child->addr, arc->count));
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}
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}
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}
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