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authorNick Clifton <nickc@redhat.com>2013-10-25 09:32:43 +0100
committerTom Tromey <tromey@sourceware.org>2013-10-25 14:03:01 +0000
commit240d6706c6a2497aa545f9ceda023196ae1e8606 (patch)
tree51bb4182f6b47f8676ca2950ffdb8a24ac94e0b5 /bfd/dwarf2.c
parent9993a3551090329c9e77d7e8a6fba6e158d1be2c (diff)
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PR binutils/15994
* dwarf2.c (lookup_address_in_line_info_table): Change return type to be the range of addresses covered by the table. (comp_unit_find_nearest_line): Likewise. (find_line): Search all CUs. Select the one that matches and covers the smallest address range.
Diffstat (limited to 'bfd/dwarf2.c')
-rw-r--r--bfd/dwarf2.c95
1 files changed, 67 insertions, 28 deletions
diff --git a/bfd/dwarf2.c b/bfd/dwarf2.c
index c9349da..cbcc9d4 100644
--- a/bfd/dwarf2.c
+++ b/bfd/dwarf2.c
@@ -1909,11 +1909,13 @@ decode_line_info (struct comp_unit *unit, struct dwarf2_debug *stash)
return NULL;
}
-/* If ADDR is within TABLE set the output parameters and return TRUE,
- otherwise return FALSE. The output parameters, FILENAME_PTR and
- LINENUMBER_PTR, are pointers to the objects to be filled in. */
+/* If ADDR is within TABLE set the output parameters and return the
+ range of addresses covered by the entry used to fill them out.
+ Otherwise set * FILENAME_PTR to NULL and return 0.
+ The parameters FILENAME_PTR, LINENUMBER_PTR and DISCRIMINATOR_PTR
+ are pointers to the objects to be filled in. */
-static bfd_boolean
+static bfd_vma
lookup_address_in_line_info_table (struct line_info_table *table,
bfd_vma addr,
const char **filename_ptr,
@@ -1955,12 +1957,12 @@ lookup_address_in_line_info_table (struct line_info_table *table,
*linenumber_ptr = each_line->line;
if (discriminator_ptr)
*discriminator_ptr = each_line->discriminator;
- return TRUE;
+ return seq->last_line->address - seq->low_pc;
}
}
*filename_ptr = NULL;
- return FALSE;
+ return 0;
}
/* Read in the .debug_ranges section for future reference. */
@@ -1976,10 +1978,10 @@ read_debug_ranges (struct comp_unit *unit)
/* Function table functions. */
-/* If ADDR is within TABLE, set FUNCTIONNAME_PTR, and return TRUE.
- Note that we need to find the function that has the smallest
- range that contains ADDR, to handle inlined functions without
- depending upon them being ordered in TABLE by increasing range. */
+/* If ADDR is within UNIT's function tables, set FUNCTIONNAME_PTR, and return
+ TRUE. Note that we need to find the function that has the smallest range
+ that contains ADDR, to handle inlined functions without depending upon
+ them being ordered in TABLE by increasing range. */
static bfd_boolean
lookup_address_in_function_table (struct comp_unit *unit,
@@ -2687,10 +2689,10 @@ comp_unit_contains_address (struct comp_unit *unit, bfd_vma addr)
FUNCTIONNAME_PTR, and LINENUMBER_PTR, are pointers to the objects
to be filled in.
- Return TRUE if UNIT contains ADDR, and no errors were encountered;
- FALSE otherwise. */
+ Returns the range of addresses covered by the entry that was used
+ to fill in *LINENUMBER_PTR or 0 if it was not filled in. */
-static bfd_boolean
+static bfd_vma
comp_unit_find_nearest_line (struct comp_unit *unit,
bfd_vma addr,
const char **filename_ptr,
@@ -2699,7 +2701,6 @@ comp_unit_find_nearest_line (struct comp_unit *unit,
unsigned int *discriminator_ptr,
struct dwarf2_debug *stash)
{
- bfd_boolean line_p;
bfd_boolean func_p;
struct funcinfo *function;
@@ -2735,11 +2736,11 @@ comp_unit_find_nearest_line (struct comp_unit *unit,
&function, functionname_ptr);
if (func_p && (function->tag == DW_TAG_inlined_subroutine))
stash->inliner_chain = function;
- line_p = lookup_address_in_line_info_table (unit->line_table, addr,
- filename_ptr,
- linenumber_ptr,
- discriminator_ptr);
- return line_p || func_p;
+
+ return lookup_address_in_line_info_table (unit->line_table, addr,
+ filename_ptr,
+ linenumber_ptr,
+ discriminator_ptr);
}
/* Check to see if line info is already decoded in a comp_unit.
@@ -3470,7 +3471,7 @@ find_line (bfd *abfd,
/* What address are we looking for? */
bfd_vma addr;
struct comp_unit* each;
- bfd_vma found = FALSE;
+ bfd_boolean found = FALSE;
bfd_boolean do_line;
*filename_ptr = NULL;
@@ -3560,18 +3561,56 @@ find_line (bfd *abfd,
}
else
{
+ bfd_vma min_range = (bfd_vma) -1;
+ const char * local_filename = NULL;
+ const char * local_functionname = NULL;
+ unsigned int local_linenumber = 0;
+ unsigned int local_discriminator = 0;
+
for (each = stash->all_comp_units; each; each = each->next_unit)
{
+ bfd_vma range = (bfd_vma) -1;
+
found = ((each->arange.high == 0
|| comp_unit_contains_address (each, addr))
- && comp_unit_find_nearest_line (each, addr,
- filename_ptr,
- functionname_ptr,
- linenumber_ptr,
- discriminator_ptr,
- stash));
+ && (range = comp_unit_find_nearest_line (each, addr,
+ & local_filename,
+ & local_functionname,
+ & local_linenumber,
+ & local_discriminator,
+ stash)) != 0);
if (found)
- goto done;
+ {
+ /* PRs 15935 15994: Bogus debug information may have provided us
+ with an erroneous match. We attempt to counter this by
+ selecting the match that has the smallest address range
+ associated with it. (We are assuming that corrupt debug info
+ will tend to result in extra large address ranges rather than
+ extra small ranges).
+
+ This does mean that we scan through all of the CUs associated
+ with the bfd each time this function is called. But this does
+ have the benefit of producing consistent results every time the
+ function is called. */
+ if (range <= min_range)
+ {
+ if (filename_ptr && local_filename)
+ * filename_ptr = local_filename;
+ if (functionname_ptr && local_functionname)
+ * functionname_ptr = local_functionname;
+ if (discriminator_ptr && local_discriminator)
+ * discriminator_ptr = local_discriminator;
+ if (local_linenumber)
+ * linenumber_ptr = local_linenumber;
+ min_range = range;
+ }
+ }
+ }
+
+ if (* linenumber_ptr)
+ {
+ found = TRUE;
+ goto done;
}
}
@@ -3663,7 +3702,7 @@ find_line (bfd *abfd,
functionname_ptr,
linenumber_ptr,
discriminator_ptr,
- stash));
+ stash)) > 0;
if ((bfd_vma) (stash->info_ptr - stash->sec_info_ptr)
== stash->sec->size)