/* Subroutines needed for unwinding stack frames for exception handling. */
-/* Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
+/* Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
+ Free Software Foundation, Inc.
Contributed by Jason Merrill <jason@cygnus.com>.
This file is part of GCC.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA. */
#ifndef _Unwind_Find_FDE
#include "tconfig.h"
#include "tsystem.h"
+#include "coretypes.h"
+#include "tm.h"
#include "dwarf2.h"
#include "unwind.h"
#define NO_BASE_OF_ENCODED_VALUE
/* Called from crtbegin.o to register the unwind info for an object. */
void
-__register_frame_info_bases (void *begin, struct object *ob,
+__register_frame_info_bases (const void *begin, struct object *ob,
void *tbase, void *dbase)
{
/* If .eh_frame is empty, don't register at all. */
- if (*(uword *) begin == 0)
+ if ((uword *) begin == 0 || *(uword *) begin == 0)
return;
ob->pc_begin = (void *)-1;
}
void
-__register_frame_info (void *begin, struct object *ob)
+__register_frame_info (const void *begin, struct object *ob)
{
__register_frame_info_bases (begin, ob, 0, 0);
}
if (*(uword *) begin == 0)
return;
- ob = (struct object *) malloc (sizeof (struct object));
+ ob = malloc (sizeof (struct object));
__register_frame_info (begin, ob);
}
void
__register_frame_table (void *begin)
{
- struct object *ob = (struct object *) malloc (sizeof (struct object));
+ struct object *ob = malloc (sizeof (struct object));
__register_frame_info_table (begin, ob);
}
from crtbegin (wherein it is declared weak), and this object does
not get pulled from libgcc.a for other reasons, then the
invocation of __deregister_frame_info will be resolved from glibc.
- Since the registration did not happen there, we'll abort.
+ Since the registration did not happen there, we'll die.
Therefore, declare a new deregistration entry point that does the
exact same thing, but will resolve to the same library as
implements __register_frame_info_bases. */
void *
-__deregister_frame_info_bases (void *begin)
+__deregister_frame_info_bases (const void *begin)
{
struct object **p;
struct object *ob = 0;
/* If .eh_frame is empty, we haven't registered. */
- if (*(uword *) begin == 0)
+ if ((uword *) begin == 0 || *(uword *) begin == 0)
return ob;
init_object_mutex_once ();
}
}
- __gthread_mutex_unlock (&object_mutex);
- abort ();
-
out:
__gthread_mutex_unlock (&object_mutex);
+ gcc_assert (ob);
return (void *) ob;
}
void *
-__deregister_frame_info (void *begin)
+__deregister_frame_info (const void *begin)
{
return __deregister_frame_info_bases (begin);
}
return (_Unwind_Ptr) ob->tbase;
case DW_EH_PE_datarel:
return (_Unwind_Ptr) ob->dbase;
+ default:
+ gcc_unreachable ();
}
- abort ();
}
/* Return the FDE pointer encoding from the CIE. */
/* ??? This is a subset of extract_cie_info from unwind-dw2.c. */
static int
-get_cie_encoding (struct dwarf_cie *cie)
+get_cie_encoding (const struct dwarf_cie *cie)
{
const unsigned char *aug, *p;
_Unwind_Ptr dummy;
if (aug[0] != 'z')
return DW_EH_PE_absptr;
- p = aug + strlen (aug) + 1; /* Skip the augmentation string. */
+ p = aug + strlen ((const char *)aug) + 1; /* Skip the augmentation string. */
p = read_uleb128 (p, &utmp); /* Skip code alignment. */
p = read_sleb128 (p, &stmp); /* Skip data alignment. */
- p++; /* Skip return address column. */
+ if (cie->version == 1) /* Skip return address column. */
+ p++;
+ else
+ p = read_uleb128 (p, &utmp);
aug++; /* Skip 'z' */
p = read_uleb128 (p, &utmp); /* Skip augmentation length. */
}
static inline int
-get_fde_encoding (struct dwarf_fde *f)
+get_fde_encoding (const struct dwarf_fde *f)
{
return get_cie_encoding (get_cie (f));
}
static int
fde_unencoded_compare (struct object *ob __attribute__((unused)),
- fde *x, fde *y)
+ const fde *x, const fde *y)
{
_Unwind_Ptr x_ptr = *(_Unwind_Ptr *) x->pc_begin;
_Unwind_Ptr y_ptr = *(_Unwind_Ptr *) y->pc_begin;
}
static int
-fde_single_encoding_compare (struct object *ob, fde *x, fde *y)
+fde_single_encoding_compare (struct object *ob, const fde *x, const fde *y)
{
_Unwind_Ptr base, x_ptr, y_ptr;
}
static int
-fde_mixed_encoding_compare (struct object *ob, fde *x, fde *y)
+fde_mixed_encoding_compare (struct object *ob, const fde *x, const fde *y)
{
int x_encoding, y_encoding;
_Unwind_Ptr x_ptr, y_ptr;
return 0;
}
-typedef int (*fde_compare_t) (struct object *, fde *, fde *);
+typedef int (*fde_compare_t) (struct object *, const fde *, const fde *);
/* This is a special mix of insertion sort and heap sort, optimized for
if (! count)
return 0;
- size = sizeof (struct fde_vector) + sizeof (fde *) * count;
- if ((accu->linear = (struct fde_vector *) malloc (size)))
+ size = sizeof (struct fde_vector) + sizeof (const fde *) * count;
+ if ((accu->linear = malloc (size)))
{
accu->linear->count = 0;
- if ((accu->erratic = (struct fde_vector *) malloc (size)))
+ if ((accu->erratic = malloc (size)))
accu->erratic->count = 0;
return 1;
}
}
static inline void
-fde_insert (struct fde_accumulator *accu, fde *this_fde)
+fde_insert (struct fde_accumulator *accu, const fde *this_fde)
{
if (accu->linear)
accu->linear->array[accu->linear->count++] = this_fde;
fde_split (struct object *ob, fde_compare_t fde_compare,
struct fde_vector *linear, struct fde_vector *erratic)
{
- static fde *marker;
+ static const fde *marker;
size_t count = linear->count;
- fde **chain_end = ▮
+ const fde **chain_end = ▮
size_t i, j, k;
/* This should optimize out, but it is wise to make sure this assumption
is correct. Should these have different sizes, we cannot cast between
them and the overlaying onto ERRATIC will not work. */
- if (sizeof (fde *) != sizeof (fde **))
- abort ();
+ gcc_assert (sizeof (const fde *) == sizeof (const fde **));
for (i = 0; i < count; i++)
{
- fde **probe;
+ const fde **probe;
for (probe = chain_end;
probe != &marker && fde_compare (ob, linear->array[i], *probe) < 0;
probe = chain_end)
{
- chain_end = (fde **) erratic->array[probe - linear->array];
+ chain_end = (const fde **) erratic->array[probe - linear->array];
erratic->array[probe - linear->array] = NULL;
}
- erratic->array[i] = (fde *) chain_end;
+ erratic->array[i] = (const fde *) chain_end;
chain_end = &linear->array[i];
}
erratic->count = k;
}
+#define SWAP(x,y) do { const fde * tmp = x; x = y; y = tmp; } while (0)
+
+/* Convert a semi-heap to a heap. A semi-heap is a heap except possibly
+ for the first (root) node; push it down to its rightful place. */
+
+static void
+frame_downheap (struct object *ob, fde_compare_t fde_compare, const fde **a,
+ int lo, int hi)
+{
+ int i, j;
+
+ for (i = lo, j = 2*i+1;
+ j < hi;
+ j = 2*i+1)
+ {
+ if (j+1 < hi && fde_compare (ob, a[j], a[j+1]) < 0)
+ ++j;
+
+ if (fde_compare (ob, a[i], a[j]) < 0)
+ {
+ SWAP (a[i], a[j]);
+ i = j;
+ }
+ else
+ break;
+ }
+}
+
/* This is O(n log(n)). BSD/OS defines heapsort in stdlib.h, so we must
use a name that does not conflict. */
/* For a description of this algorithm, see:
Samuel P. Harbison, Guy L. Steele Jr.: C, a reference manual, 2nd ed.,
p. 60-61. */
- fde ** a = erratic->array;
+ const fde ** a = erratic->array;
/* A portion of the array is called a "heap" if for all i>=0:
If i and 2i+1 are valid indices, then a[i] >= a[2i+1].
If i and 2i+2 are valid indices, then a[i] >= a[2i+2]. */
-#define SWAP(x,y) do { fde * tmp = x; x = y; y = tmp; } while (0)
size_t n = erratic->count;
- size_t m = n;
- size_t i;
-
- while (m > 0)
- {
- /* Invariant: a[m..n-1] is a heap. */
- m--;
- for (i = m; 2*i+1 < n; )
- {
- if (2*i+2 < n
- && fde_compare (ob, a[2*i+2], a[2*i+1]) > 0
- && fde_compare (ob, a[2*i+2], a[i]) > 0)
- {
- SWAP (a[i], a[2*i+2]);
- i = 2*i+2;
- }
- else if (fde_compare (ob, a[2*i+1], a[i]) > 0)
- {
- SWAP (a[i], a[2*i+1]);
- i = 2*i+1;
- }
- else
- break;
- }
- }
- while (n > 1)
+ int m;
+
+ /* Expand our heap incrementally from the end of the array, heapifying
+ each resulting semi-heap as we go. After each step, a[m] is the top
+ of a heap. */
+ for (m = n/2-1; m >= 0; --m)
+ frame_downheap (ob, fde_compare, a, m, n);
+
+ /* Shrink our heap incrementally from the end of the array, first
+ swapping out the largest element a[0] and then re-heapifying the
+ resulting semi-heap. After each step, a[0..m) is a heap. */
+ for (m = n-1; m >= 1; --m)
{
- /* Invariant: a[0..n-1] is a heap. */
- n--;
- SWAP (a[0], a[n]);
- for (i = 0; 2*i+1 < n; )
- {
- if (2*i+2 < n
- && fde_compare (ob, a[2*i+2], a[2*i+1]) > 0
- && fde_compare (ob, a[2*i+2], a[i]) > 0)
- {
- SWAP (a[i], a[2*i+2]);
- i = 2*i+2;
- }
- else if (fde_compare (ob, a[2*i+1], a[i]) > 0)
- {
- SWAP (a[i], a[2*i+1]);
- i = 2*i+1;
- }
- else
- break;
- }
+ SWAP (a[0], a[m]);
+ frame_downheap (ob, fde_compare, a, 0, m);
}
#undef SWAP
}
struct fde_vector *v1, struct fde_vector *v2)
{
size_t i1, i2;
- fde * fde2;
+ const fde * fde2;
i2 = v2->count;
if (i2 > 0)
{
fde_compare_t fde_compare;
- if (accu->linear && accu->linear->count != count)
- abort ();
+ gcc_assert (!accu->linear || accu->linear->count == count);
if (ob->s.b.mixed_encoding)
fde_compare = fde_mixed_encoding_compare;
if (accu->erratic)
{
fde_split (ob, fde_compare, accu->linear, accu->erratic);
- if (accu->linear->count + accu->erratic->count != count)
- abort ();
+ gcc_assert (accu->linear->count + accu->erratic->count == count);
frame_heapsort (ob, fde_compare, accu->erratic);
fde_merge (ob, fde_compare, accu->linear, accu->erratic);
free (accu->erratic);
encountered along the way. */
static size_t
-classify_object_over_fdes (struct object *ob, fde *this_fde)
+classify_object_over_fdes (struct object *ob, const fde *this_fde)
{
- struct dwarf_cie *last_cie = 0;
+ const struct dwarf_cie *last_cie = 0;
size_t count = 0;
int encoding = DW_EH_PE_absptr;
_Unwind_Ptr base = 0;
for (; ! last_fde (ob, this_fde); this_fde = next_fde (this_fde))
{
- struct dwarf_cie *this_cie;
+ const struct dwarf_cie *this_cie;
_Unwind_Ptr mask, pc_begin;
/* Skip CIEs. */
}
static void
-add_fdes (struct object *ob, struct fde_accumulator *accu, fde *this_fde)
+add_fdes (struct object *ob, struct fde_accumulator *accu, const fde *this_fde)
{
- struct dwarf_cie *last_cie = 0;
+ const struct dwarf_cie *last_cie = 0;
int encoding = ob->s.b.encoding;
_Unwind_Ptr base = base_from_object (ob->s.b.encoding, ob);
for (; ! last_fde (ob, this_fde); this_fde = next_fde (this_fde))
{
- struct dwarf_cie *this_cie;
+ const struct dwarf_cie *this_cie;
/* Skip CIEs. */
if (this_fde->CIE_delta == 0)
used when there was insufficient memory to allocate and sort an
array. */
-static fde *
-linear_search_fdes (struct object *ob, fde *this_fde, void *pc)
+static const fde *
+linear_search_fdes (struct object *ob, const fde *this_fde, void *pc)
{
- struct dwarf_cie *last_cie = 0;
+ const struct dwarf_cie *last_cie = 0;
int encoding = ob->s.b.encoding;
_Unwind_Ptr base = base_from_object (ob->s.b.encoding, ob);
for (; ! last_fde (ob, this_fde); this_fde = next_fde (this_fde))
{
- struct dwarf_cie *this_cie;
+ const struct dwarf_cie *this_cie;
_Unwind_Ptr pc_begin, pc_range;
/* Skip CIEs. */
else
{
_Unwind_Ptr mask;
- const char *p;
+ const unsigned char *p;
p = read_encoded_value_with_base (encoding, base,
this_fde->pc_begin, &pc_begin);
/* Binary search for an FDE containing the given PC. Here are three
implementations of increasing complexity. */
-static inline fde *
+static inline const fde *
binary_search_unencoded_fdes (struct object *ob, void *pc)
{
struct fde_vector *vec = ob->u.sort;
for (lo = 0, hi = vec->count; lo < hi; )
{
size_t i = (lo + hi) / 2;
- fde *f = vec->array[i];
+ const fde *f = vec->array[i];
void *pc_begin;
uaddr pc_range;
return NULL;
}
-static inline fde *
+static inline const fde *
binary_search_single_encoding_fdes (struct object *ob, void *pc)
{
struct fde_vector *vec = ob->u.sort;
for (lo = 0, hi = vec->count; lo < hi; )
{
size_t i = (lo + hi) / 2;
- fde *f = vec->array[i];
+ const fde *f = vec->array[i];
_Unwind_Ptr pc_begin, pc_range;
- const char *p;
+ const unsigned char *p;
p = read_encoded_value_with_base (encoding, base, f->pc_begin,
&pc_begin);
return NULL;
}
-static inline fde *
+static inline const fde *
binary_search_mixed_encoding_fdes (struct object *ob, void *pc)
{
struct fde_vector *vec = ob->u.sort;
for (lo = 0, hi = vec->count; lo < hi; )
{
size_t i = (lo + hi) / 2;
- fde *f = vec->array[i];
+ const fde *f = vec->array[i];
_Unwind_Ptr pc_begin, pc_range;
- const char *p;
+ const unsigned char *p;
int encoding;
encoding = get_fde_encoding (f);
return NULL;
}
-static fde *
+static const fde *
search_object (struct object* ob, void *pc)
{
/* If the data hasn't been sorted, try to do this now. We may have
fde **p;
for (p = ob->u.array; *p ; p++)
{
- fde *f = linear_search_fdes (ob, *p, pc);
+ const fde *f = linear_search_fdes (ob, *p, pc);
if (f)
return f;
}
}
}
-fde *
+const fde *
_Unwind_Find_FDE (void *pc, struct dwarf_eh_bases *bases)
{
struct object *ob;
- fde *f = NULL;
+ const fde *f = NULL;
init_object_mutex_once ();
__gthread_mutex_lock (&object_mutex);
if (f)
{
int encoding;
+ _Unwind_Ptr func;
bases->tbase = ob->tbase;
bases->dbase = ob->dbase;
if (ob->s.b.mixed_encoding)
encoding = get_fde_encoding (f);
read_encoded_value_with_base (encoding, base_from_object (encoding, ob),
- f->pc_begin, (_Unwind_Ptr *)&bases->func);
+ f->pc_begin, &func);
+ bases->func = (void *) func;
}
return f;
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