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275 lines
7.0 KiB
C
275 lines
7.0 KiB
C
/* symtab.c
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Copyright (C) 1999-2017 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 "corefile.h"
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static int cmp_addr (const PTR, const PTR);
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Sym_Table symtab;
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/* Initialize a symbol (so it's empty). */
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void
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sym_init (Sym *sym)
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{
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memset (sym, 0, sizeof (*sym));
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/* It is not safe to assume that a binary zero corresponds
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to a floating-point 0.0, so initialize floats explicitly. */
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sym->hist.time = 0.0;
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sym->cg.child_time = 0.0;
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sym->cg.prop.fract = 0.0;
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sym->cg.prop.self = 0.0;
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sym->cg.prop.child = 0.0;
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}
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/* Compare the function entry-point of two symbols and return <0, =0,
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or >0 depending on whether the left value is smaller than, equal
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to, or greater than the right value. If two symbols are equal
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but one has is_func set and the other doesn't, we make the
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non-function symbol one "bigger" so that the function symbol will
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survive duplicate removal. Finally, if both symbols have the
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same is_func value, we discriminate against is_static such that
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the global symbol survives. */
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static int
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cmp_addr (const PTR lp, const PTR rp)
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{
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const Sym *left = (const Sym *) lp;
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const Sym *right = (const Sym *) rp;
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if (left->addr > right->addr)
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return 1;
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else if (left->addr < right->addr)
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return -1;
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if (left->is_func != right->is_func)
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return right->is_func - left->is_func;
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return left->is_static - right->is_static;
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}
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void
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symtab_finalize (Sym_Table *tab)
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{
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Sym *src, *dst;
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bfd_vma prev_addr;
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if (!tab->len)
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return;
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/* Sort symbol table in order of increasing function addresses. */
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qsort (tab->base, tab->len, sizeof (Sym), cmp_addr);
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/* Remove duplicate entries to speed-up later processing and
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set end_addr if its not set yet. */
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prev_addr = tab->base[0].addr + 1;
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for (src = dst = tab->base; src < tab->limit; ++src)
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{
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if (src->addr == prev_addr)
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{
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/* If same address, favor global symbol over static one,
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then function over line number. If both symbols are
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either static or global and either function or line, check
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whether one has name beginning with underscore while
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the other doesn't. In such cases, keep sym without
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underscore. This takes cares of compiler generated
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symbols (such as __gnu_compiled, __c89_used, etc.). */
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if ((!src->is_static && dst[-1].is_static)
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|| ((src->is_static == dst[-1].is_static)
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&& ((src->is_func && !dst[-1].is_func)
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|| ((src->is_func == dst[-1].is_func)
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&& ((src->name[0] != '_' && dst[-1].name[0] == '_')
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|| (src->name[0]
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&& src->name[1] != '_'
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&& dst[-1].name[1] == '_'))))))
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{
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DBG (AOUTDEBUG | IDDEBUG,
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printf ("[symtab_finalize] favor %s@%c%c over %s@%c%c",
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src->name, src->is_static ? 't' : 'T',
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src->is_func ? 'F' : 'f',
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dst[-1].name, dst[-1].is_static ? 't' : 'T',
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dst[-1].is_func ? 'F' : 'f');
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printf (" (addr=%lx)\n", (unsigned long) src->addr));
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dst[-1] = *src;
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}
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else
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{
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DBG (AOUTDEBUG | IDDEBUG,
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printf ("[symtab_finalize] favor %s@%c%c over %s@%c%c",
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dst[-1].name, dst[-1].is_static ? 't' : 'T',
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dst[-1].is_func ? 'F' : 'f',
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src->name, src->is_static ? 't' : 'T',
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src->is_func ? 'F' : 'f');
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printf (" (addr=%lx)\n", (unsigned long) src->addr));
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}
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}
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else
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{
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if (dst > tab->base && dst[-1].end_addr == 0)
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dst[-1].end_addr = src->addr - 1;
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/* Retain sym only if it has a non-empty address range. */
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if (!src->end_addr || src->addr <= src->end_addr)
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{
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*dst = *src;
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dst++;
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prev_addr = src->addr;
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}
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}
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}
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if (tab->len > 0 && dst[-1].end_addr == 0)
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dst[-1].end_addr
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= core_text_sect->vma + bfd_get_section_size (core_text_sect) - 1;
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DBG (AOUTDEBUG | IDDEBUG,
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printf ("[symtab_finalize]: removed %d duplicate entries\n",
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tab->len - (int) (dst - tab->base)));
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tab->limit = dst;
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tab->len = tab->limit - tab->base;
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DBG (AOUTDEBUG | IDDEBUG,
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unsigned int j;
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for (j = 0; j < tab->len; ++j)
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{
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printf ("[symtab_finalize] 0x%lx-0x%lx\t%s\n",
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(unsigned long) tab->base[j].addr,
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(unsigned long) tab->base[j].end_addr,
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tab->base[j].name);
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}
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);
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}
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#ifdef DEBUG
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Sym *
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dbg_sym_lookup (Sym_Table *sym_tab, bfd_vma address)
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{
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unsigned long low, mid, high;
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Sym *sym;
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fprintf (stderr, "[dbg_sym_lookup] address 0x%lx\n",
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(unsigned long) address);
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sym = sym_tab->base;
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for (low = 0, high = sym_tab->len - 1; low != high;)
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{
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mid = (high + low) >> 1;
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fprintf (stderr, "[dbg_sym_lookup] low=0x%lx, mid=0x%lx, high=0x%lx\n",
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low, mid, high);
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fprintf (stderr, "[dbg_sym_lookup] sym[m]=0x%lx sym[m + 1]=0x%lx\n",
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(unsigned long) sym[mid].addr,
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(unsigned long) sym[mid + 1].addr);
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if (sym[mid].addr <= address && sym[mid + 1].addr > address)
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return &sym[mid];
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if (sym[mid].addr > address)
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high = mid;
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else
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low = mid + 1;
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}
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fprintf (stderr, "[dbg_sym_lookup] binary search fails???\n");
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return 0;
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}
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#endif /* DEBUG */
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/* Look up an address in the symbol-table that is sorted by address.
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If address does not hit any symbol, 0 is returned. */
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Sym *
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sym_lookup (Sym_Table *sym_tab, bfd_vma address)
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{
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long low, high;
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long mid = -1;
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Sym *sym;
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#ifdef DEBUG
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int probes = 0;
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#endif /* DEBUG */
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if (!sym_tab->len)
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return 0;
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sym = sym_tab->base;
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for (low = 0, high = sym_tab->len - 1; low != high;)
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{
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DBG (LOOKUPDEBUG, ++probes);
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mid = (high + low) / 2;
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if (sym[mid].addr <= address && sym[mid + 1].addr > address)
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{
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if (address > sym[mid].end_addr)
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{
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/* Address falls into gap between
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sym[mid] and sym[mid + 1]. */
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return 0;
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}
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else
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{
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DBG (LOOKUPDEBUG,
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printf ("[sym_lookup] %d probes (symtab->len=%u)\n",
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probes, sym_tab->len - 1));
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return &sym[mid];
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}
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}
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if (sym[mid].addr > address)
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high = mid;
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else
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low = mid + 1;
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}
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if (sym[mid + 1].addr <= address)
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{
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if (address > sym[mid + 1].end_addr)
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{
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/* Address is beyond end of sym[mid + 1]. */
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return 0;
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}
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else
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{
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DBG (LOOKUPDEBUG, printf ("[sym_lookup] %d (%u) probes, fall off\n",
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probes, sym_tab->len - 1));
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return &sym[mid + 1];
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}
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}
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return 0;
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}
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