2007-07-26 Michael Snyder <msnyder@access-company.com>
[binutils.git] / gprof / symtab.c
blobbdd1a9e5078dfcb2b008aede1de29e3720d3cbc1
1 /* symtab.c
3 Copyright 1999, 2000, 2001, 2002, 2004, 2007 Free Software Foundation, Inc.
5 This file is part of GNU Binutils.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
20 02110-1301, USA. */
22 #include "gprof.h"
23 #include "search_list.h"
24 #include "source.h"
25 #include "symtab.h"
26 #include "cg_arcs.h"
27 #include "corefile.h"
29 static int cmp_addr (const PTR, const PTR);
31 Sym_Table symtab;
34 /* Initialize a symbol (so it's empty). */
36 void
37 sym_init (Sym *sym)
39 memset (sym, 0, sizeof (*sym));
41 /* It is not safe to assume that a binary zero corresponds
42 to a floating-point 0.0, so initialize floats explicitly. */
43 sym->hist.time = 0.0;
44 sym->cg.child_time = 0.0;
45 sym->cg.prop.fract = 0.0;
46 sym->cg.prop.self = 0.0;
47 sym->cg.prop.child = 0.0;
51 /* Compare the function entry-point of two symbols and return <0, =0,
52 or >0 depending on whether the left value is smaller than, equal
53 to, or greater than the right value. If two symbols are equal
54 but one has is_func set and the other doesn't, we make the
55 non-function symbol one "bigger" so that the function symbol will
56 survive duplicate removal. Finally, if both symbols have the
57 same is_func value, we discriminate against is_static such that
58 the global symbol survives. */
60 static int
61 cmp_addr (const PTR lp, const PTR rp)
63 const Sym *left = (const Sym *) lp;
64 const Sym *right = (const Sym *) rp;
66 if (left->addr > right->addr)
67 return 1;
68 else if (left->addr < right->addr)
69 return -1;
71 if (left->is_func != right->is_func)
72 return right->is_func - left->is_func;
74 return left->is_static - right->is_static;
78 void
79 symtab_finalize (Sym_Table *tab)
81 Sym *src, *dst;
82 bfd_vma prev_addr;
84 if (!tab->len)
85 return;
87 /* Sort symbol table in order of increasing function addresses. */
88 qsort (tab->base, tab->len, sizeof (Sym), cmp_addr);
90 /* Remove duplicate entries to speed-up later processing and
91 set end_addr if its not set yet. */
92 prev_addr = tab->base[0].addr + 1;
94 for (src = dst = tab->base; src < tab->limit; ++src)
96 if (src->addr == prev_addr)
98 /* If same address, favor global symbol over static one,
99 then function over line number. If both symbols are
100 either static or global and either function or line, check
101 whether one has name beginning with underscore while
102 the other doesn't. In such cases, keep sym without
103 underscore. This takes cares of compiler generated
104 symbols (such as __gnu_compiled, __c89_used, etc.). */
105 if ((!src->is_static && dst[-1].is_static)
106 || ((src->is_static == dst[-1].is_static)
107 && ((src->is_func && !dst[-1].is_func)
108 || ((src->is_func == dst[-1].is_func)
109 && ((src->name[0] != '_' && dst[-1].name[0] == '_')
110 || (src->name[0]
111 && src->name[1] != '_'
112 && dst[-1].name[1] == '_'))))))
114 DBG (AOUTDEBUG | IDDEBUG,
115 printf ("[symtab_finalize] favor %s@%c%c over %s@%c%c",
116 src->name, src->is_static ? 't' : 'T',
117 src->is_func ? 'F' : 'f',
118 dst[-1].name, dst[-1].is_static ? 't' : 'T',
119 dst[-1].is_func ? 'F' : 'f');
120 printf (" (addr=%lx)\n", (unsigned long) src->addr));
122 dst[-1] = *src;
124 else
126 DBG (AOUTDEBUG | IDDEBUG,
127 printf ("[symtab_finalize] favor %s@%c%c over %s@%c%c",
128 dst[-1].name, dst[-1].is_static ? 't' : 'T',
129 dst[-1].is_func ? 'F' : 'f',
130 src->name, src->is_static ? 't' : 'T',
131 src->is_func ? 'F' : 'f');
132 printf (" (addr=%lx)\n", (unsigned long) src->addr));
135 else
137 if (dst > tab->base && dst[-1].end_addr == 0)
138 dst[-1].end_addr = src->addr - 1;
140 /* Retain sym only if it has a non-empty address range. */
141 if (!src->end_addr || src->addr <= src->end_addr)
143 *dst = *src;
144 dst++;
145 prev_addr = src->addr;
150 if (tab->len > 0 && dst[-1].end_addr == 0)
151 dst[-1].end_addr
152 = core_text_sect->vma + bfd_get_section_size (core_text_sect) - 1;
154 DBG (AOUTDEBUG | IDDEBUG,
155 printf ("[symtab_finalize]: removed %d duplicate entries\n",
156 tab->len - (int) (dst - tab->base)));
158 tab->limit = dst;
159 tab->len = tab->limit - tab->base;
161 DBG (AOUTDEBUG | IDDEBUG,
162 unsigned int j;
164 for (j = 0; j < tab->len; ++j)
166 printf ("[symtab_finalize] 0x%lx-0x%lx\t%s\n",
167 (long) tab->base[j].addr, (long) tab->base[j].end_addr,
168 tab->base[j].name);
174 #ifdef DEBUG
176 Sym *
177 dbg_sym_lookup (Sym_Table *sym_tab, bfd_vma address)
179 long low, mid, high;
180 Sym *sym;
182 fprintf (stderr, "[dbg_sym_lookup] address 0x%lx\n",
183 (unsigned long) address);
185 sym = sym_tab->base;
186 for (low = 0, high = sym_tab->len - 1; low != high;)
188 mid = (high + low) >> 1;
190 fprintf (stderr, "[dbg_sym_lookup] low=0x%lx, mid=0x%lx, high=0x%lx\n",
191 low, mid, high);
192 fprintf (stderr, "[dbg_sym_lookup] sym[m]=0x%lx sym[m + 1]=0x%lx\n",
193 (unsigned long) sym[mid].addr,
194 (unsigned long) sym[mid + 1].addr);
196 if (sym[mid].addr <= address && sym[mid + 1].addr > address)
197 return &sym[mid];
199 if (sym[mid].addr > address)
200 high = mid;
201 else
202 low = mid + 1;
205 fprintf (stderr, "[dbg_sym_lookup] binary search fails???\n");
207 return 0;
210 #endif /* DEBUG */
213 /* Look up an address in the symbol-table that is sorted by address.
214 If address does not hit any symbol, 0 is returned. */
215 Sym *
216 sym_lookup (Sym_Table *sym_tab, bfd_vma address)
218 long low, high;
219 long mid = -1;
220 Sym *sym;
221 #ifdef DEBUG
222 int probes = 0;
223 #endif /* DEBUG */
225 if (!sym_tab->len)
226 return 0;
228 sym = sym_tab->base;
229 for (low = 0, high = sym_tab->len - 1; low != high;)
231 DBG (LOOKUPDEBUG, ++probes);
232 mid = (high + low) / 2;
234 if (sym[mid].addr <= address && sym[mid + 1].addr > address)
236 if (address > sym[mid].end_addr)
238 /* Address falls into gap between
239 sym[mid] and sym[mid + 1]. */
240 return 0;
242 else
244 DBG (LOOKUPDEBUG,
245 printf ("[sym_lookup] %d probes (symtab->len=%u)\n",
246 probes, sym_tab->len - 1));
247 return &sym[mid];
251 if (sym[mid].addr > address)
252 high = mid;
253 else
254 low = mid + 1;
257 if (sym[mid + 1].addr <= address)
259 if (address > sym[mid + 1].end_addr)
261 /* Address is beyond end of sym[mid + 1]. */
262 return 0;
264 else
266 DBG (LOOKUPDEBUG, printf ("[sym_lookup] %d (%u) probes, fall off\n",
267 probes, sym_tab->len - 1));
268 return &sym[mid + 1];
272 return 0;