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