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Support lexical blocks and function bodies that occupy

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non-contiguous address ranges.
* addrmap.c, addrmap.h: New files.
* block.h (struct addrmap): New forward declaration.
(struct blockvector): New member, 'map'.
(BLOCKVECTOR_MAP): New accessor macro.
* block.c: #include "addrmap.h"
(blockvector_for_pc_sect): If the blockvector we've found has
an address map, use it instead of searching the blocks.
* buildsym.c: #include "addrmap.h"
(pending_addrmap_obstack, pending_addrmap_interesting): New static
variables.
(really_free_pendings): If we have a pending addrmap, free it too.
(record_block_range): New function.
(make_blockvector): If we have an interesting pending addrmap,
record it in the new blockvector.
(start_symtab, buildsym_init): Assert that there is no pending
addrmap now; we should have cleaned up any addrmaps we'd built
previously.
(end_symtab): If there is a pending addrmap left over that didn't
get included in the blockvector, free it.
* buildsym.h (struct addrmap): New forward declaration.
(record_block_range): New prototype.
* objfiles.c: #include "addrmap.h".
(objfile_relocate): Relocate the blockvector's address map, if
present.
* dwarf2read.c (dwarf2_record_block_ranges): New function.
(read_func_scope, read_lexical_block_scope): Call it.
* Makefile.in (SFILES): Add addrmap.c.
(addrmap_h): New header dependency variable.
(COMMON_OBS): Add addrmap.o.
(addrmap.o): New rule.l
(block.o, objfiles.o, buildsym.o): Depend on $(addrmap_h).

* block.c (blockvector_for_pc, blockvector_for_pc_sect): Return a
pointer to the block, not its index in the blockvector.
(block_for_pc_sect): Use the returned block, instead of looking it
up ourselves.
* block.h (blockvector_for_pc, blockvector_for_pc_sect): Update
declarations.
* breakpoint.c (resolve_sal_pc): Use returned block, instead of
looking it up ourselves.
* stack.c (print_frame_label_vars): Disable function, which
depends on the block's index.

* buildsym.c (finish_block): Return the block we've built.
* buildsym.h (finish_block): Update prototype.

* defs.h (CORE_ADDR_MAX): New constant.
This commit is contained in:
Jim Blandy 2007-12-04 23:43:57 +00:00
parent c420411fe8
commit 801e3a5b56
13 changed files with 947 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
gdb/ChangeLog
View File

@ -1,3 +1,55 @@
2007-12-04 Jim Blandy <jimb@codesourcery.com>
Support lexical blocks and function bodies that occupy
non-contiguous address ranges.
* addrmap.c, addrmap.h: New files.
* block.h (struct addrmap): New forward declaration.
(struct blockvector): New member, 'map'.
(BLOCKVECTOR_MAP): New accessor macro.
* block.c: #include "addrmap.h"
(blockvector_for_pc_sect): If the blockvector we've found has
an address map, use it instead of searching the blocks.
* buildsym.c: #include "addrmap.h"
(pending_addrmap_obstack, pending_addrmap_interesting): New static
variables.
(really_free_pendings): If we have a pending addrmap, free it too.
(record_block_range): New function.
(make_blockvector): If we have an interesting pending addrmap,
record it in the new blockvector.
(start_symtab, buildsym_init): Assert that there is no pending
addrmap now; we should have cleaned up any addrmaps we'd built
previously.
(end_symtab): If there is a pending addrmap left over that didn't
get included in the blockvector, free it.
* buildsym.h (struct addrmap): New forward declaration.
(record_block_range): New prototype.
* objfiles.c: #include "addrmap.h".
(objfile_relocate): Relocate the blockvector's address map, if
present.
* dwarf2read.c (dwarf2_record_block_ranges): New function.
(read_func_scope, read_lexical_block_scope): Call it.
* Makefile.in (SFILES): Add addrmap.c.
(addrmap_h): New header dependency variable.
(COMMON_OBS): Add addrmap.o.
(addrmap.o): New rule.l
(block.o, objfiles.o, buildsym.o): Depend on $(addrmap_h).
* block.c (blockvector_for_pc, blockvector_for_pc_sect): Return a
pointer to the block, not its index in the blockvector.
(block_for_pc_sect): Use the returned block, instead of looking it
up ourselves.
* block.h (blockvector_for_pc, blockvector_for_pc_sect): Update
declarations.
* breakpoint.c (resolve_sal_pc): Use returned block, instead of
looking it up ourselves.
* stack.c (print_frame_label_vars): Disable function, which
depends on the block's index.
* buildsym.c (finish_block): Return the block we've built.
* buildsym.h (finish_block): Update prototype.
* defs.h (CORE_ADDR_MAX): New constant.
2007-12-04 Ulrich Weigand <uweigand@de.ibm.com>
* coffread.c (decode_type): Use builtin_type_int32 instead

12
gdb/Makefile.in
View File

@ -586,6 +586,7 @@ TARGET_FLAGS_TO_PASS = \
# SFILES is used in building the distribution archive.
SFILES = ada-exp.y ada-lang.c ada-typeprint.c ada-valprint.c \
addrmap.c \
auxv.c ax-general.c ax-gdb.c \
bcache.c \
bfd-target.c \
@ -717,6 +718,7 @@ nm_h = @nm_h@
ada_lang_h = ada-lang.h $(value_h) $(gdbtypes_h) $(breakpoint_h)
ada_lex_c = ada-lex.c $(gdb_string_h)
addrmap_h = addrmap.h
alphabsd_tdep_h = alphabsd-tdep.h
alpha_tdep_h = alpha-tdep.h
amd64_linux_tdep_h = amd64-linux-tdep.h
@ -1022,6 +1024,7 @@ TAGFILES_WITH_SRCDIR = $(HFILES_WITH_SRCDIR)
COMMON_OBS = $(DEPFILES) $(CONFIG_OBS) $(YYOBJ) \
version.o \
annotate.o \
addrmap.o \
auxv.o \
bfd-target.o \
blockframe.o breakpoint.o findvar.o regcache.o \
@ -1803,6 +1806,8 @@ ada-valprint.o: ada-valprint.c $(defs_h) $(gdb_string_h) $(symtab_h) \
$(gdbtypes_h) $(expression_h) $(value_h) $(demangle_h) $(valprint_h) \
$(language_h) $(annotate_h) $(ada_lang_h) $(c_lang_h) $(infcall_h) \
$(exceptions_h)
addrmap.o: addrmap.c $(defs_h) $(splay_tree_h) $(gdb_obstack_h) $(addrmap_h) \
$(gdb_assert_h)
aix-thread.o: aix-thread.c $(defs_h) $(gdb_assert_h) $(gdbthread_h) \
$(target_h) $(inferior_h) $(regcache_h) $(gdbcmd_h) $(ppc_tdep_h) \
$(gdb_string_h) $(observer_h)
@ -1930,7 +1935,7 @@ bcache.o: bcache.c $(defs_h) $(gdb_obstack_h) $(bcache_h) $(gdb_string_h) \
bfd-target.o: bfd-target.c $(defs_h) $(target_h) $(bfd_target_h) \
$(gdb_assert_h) $(gdb_string_h)
block.o: block.c $(defs_h) $(block_h) $(symtab_h) $(symfile_h) \
$(gdb_obstack_h) $(cp_support_h)
$(gdb_obstack_h) $(cp_support_h) $(addrmap_h)
blockframe.o: blockframe.c $(defs_h) $(symtab_h) $(bfd_h) $(objfiles_h) \
$(frame_h) $(gdbcore_h) $(value_h) $(target_h) $(inferior_h) \
$(annotate_h) $(regcache_h) $(gdb_assert_h) $(dummy_frame_h) \
@ -1954,7 +1959,8 @@ buildsym.o: buildsym.c $(defs_h) $(bfd_h) $(gdb_obstack_h) $(symtab_h) \
$(symfile_h) $(objfiles_h) $(gdbtypes_h) $(gdb_assert_h) \
$(complaints_h) $(gdb_string_h) $(expression_h) $(bcache_h) \
$(filenames_h) $(macrotab_h) $(demangle_h) $(block_h) \
$(cp_support_h) $(dictionary_h) $(buildsym_h) $(stabsread_h)
$(cp_support_h) $(dictionary_h) $(buildsym_h) $(stabsread_h) \
$(addrmap_h)
c-exp.o: c-exp.c $(defs_h) $(gdb_string_h) $(expression_h) $(value_h) \
$(parser_defs_h) $(language_h) $(c_lang_h) $(bfd_h) $(symfile_h) \
$(objfiles_h) $(charset_h) $(block_h) $(cp_support_h) $(dfp_h)
@ -2520,7 +2526,7 @@ objfiles.o: objfiles.c $(defs_h) $(bfd_h) $(symtab_h) $(symfile_h) \
$(objfiles_h) $(gdb_stabs_h) $(target_h) $(bcache_h) $(mdebugread_h) \
$(gdb_assert_h) $(gdb_stat_h) $(gdb_obstack_h) $(gdb_string_h) \
$(hashtab_h) $(breakpoint_h) $(block_h) $(dictionary_h) $(source_h) \
$(parser_defs_h) $(expression_h)
$(parser_defs_h) $(expression_h) $(addrmap_h)
observer.o: observer.c $(defs_h) $(observer_h) $(command_h) $(gdbcmd_h) \
$(observer_inc)
obsd-tdep.o: obsd-tdep.c $(defs_h) $(frame_h) $(symtab_h) $(obsd_tdep_h)

532
gdb/addrmap.c Normal file
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@ -0,0 +1,532 @@
/* addrmap.c --- implementation of address map data structure.
Copyright (C) 2007 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
#include "defs.h"
#include <stdlib.h>
#include "splay-tree.h"
#include "gdb_obstack.h"
#include "addrmap.h"
#include "gdb_assert.h"
/* The "abstract class". */
/* Functions implementing the addrmap functions for a particular
implementation. */
struct addrmap_funcs
{
void (*set_empty) (struct addrmap *this,
CORE_ADDR start, CORE_ADDR end_inclusive,
void *obj);
void *(*find) (struct addrmap *this, CORE_ADDR addr);
struct addrmap *(*create_fixed) (struct addrmap *this,
struct obstack *obstack);
void (*relocate) (struct addrmap *this, CORE_ADDR offset);
};
struct addrmap
{
struct addrmap_funcs *funcs;
};
void
addrmap_set_empty (struct addrmap *map,
CORE_ADDR start, CORE_ADDR end_inclusive,
void *obj)
{
map->funcs->set_empty (map, start, end_inclusive, obj);
}
void *
addrmap_find (struct addrmap *map, CORE_ADDR addr)
{
return map->funcs->find (map, addr);
}
struct addrmap *
addrmap_create_fixed (struct addrmap *original, struct obstack *obstack)
{
return original->funcs->create_fixed (original, obstack);
}
/* Relocate all the addresses in MAP by OFFSET. (This can be applied
to either mutable or immutable maps.) */
void
addrmap_relocate (struct addrmap *map, CORE_ADDR offset)
{
map->funcs->relocate (map, offset);
}
/* Fixed address maps. */
/* A transition: a point in an address map where the value changes.
The map maps ADDR to VALUE, but if ADDR > 0, it maps ADDR-1 to
something else. */
struct addrmap_transition
{
CORE_ADDR addr;
void *value;
};
struct addrmap_fixed
{
struct addrmap addrmap;
/* The number of transitions in TRANSITIONS. */
size_t num_transitions;
/* An array of transitions, sorted by address. For every point in
the map where either ADDR == 0 or ADDR is mapped to one value and
ADDR - 1 is mapped to something different, we have an entry here
containing ADDR and VALUE. (Note that this means we always have
an entry for address 0). */
struct addrmap_transition transitions[1];
};
static void
addrmap_fixed_set_empty (struct addrmap *this,
CORE_ADDR start, CORE_ADDR end_inclusive,
void *obj)
{
internal_error (__FILE__, __LINE__,
"addrmap_fixed_set_empty: "
"fixed addrmaps can't be changed\n");
}
static void *
addrmap_fixed_find (struct addrmap *this, CORE_ADDR addr)
{
struct addrmap_fixed *map = (struct addrmap_fixed *) this;
struct addrmap_transition *bottom = &map->transitions[0];
struct addrmap_transition *top = &map->transitions[map->num_transitions - 1];
while (bottom < top)
{
/* This needs to round towards top, or else when top = bottom +
1 (i.e., two entries are under consideration), then mid ==
bottom, and then we may not narrow the range when (mid->addr
< addr). */
struct addrmap_transition *mid = top - (top - bottom) / 2;
if (mid->addr == addr)
{
bottom = mid;
break;
}
else if (mid->addr < addr)
/* We don't eliminate mid itself here, since each transition
covers all subsequent addresses until the next. This is why
we must round up in computing the midpoint. */
bottom = mid;
else
top = mid - 1;
}
return bottom->value;
}
static struct addrmap *
addrmap_fixed_create_fixed (struct addrmap *this, struct obstack *obstack)
{
abort ();
}
static void
addrmap_fixed_relocate (struct addrmap *this, CORE_ADDR offset)
{
struct addrmap_fixed *map = (struct addrmap_fixed *) this;
size_t i;
for (i = 0; i < map->num_transitions; i++)
map->transitions[i].addr += offset;
}
static struct addrmap_funcs addrmap_fixed_funcs =
{
.set_empty = addrmap_fixed_set_empty,
.find = addrmap_fixed_find,
.create_fixed = addrmap_fixed_create_fixed,
.relocate = addrmap_fixed_relocate
};
/* Mutable address maps. */
struct addrmap_mutable
{
struct addrmap addrmap;
/* The obstack to use for allocations for this map. */
struct obstack *obstack;
/* A splay tree, with a node for each transition; there is a
transition at address T if T-1 and T map to different objects.
Any addresses below the first node map to NULL. (Unlike
fixed maps, we have no entry at (CORE_ADDR) 0; it doesn't
simplify enough.)
The last region is assumed to end at CORE_ADDR_MAX.
Since we can't know whether CORE_ADDR is larger or smaller than
splay_tree_key (unsigned long) --- I think both are possible,
given all combinations of 32- and 64-bit hosts and targets ---
our keys are pointers to CORE_ADDR values. Since the splay tree
library doesn't pass any closure pointer to the key free
function, we can't keep a freelist for keys. Since mutable
addrmaps are only used temporarily right now, we just leak keys
from deleted nodes; they'll be freed when the obstack is freed. */
splay_tree tree;
/* A freelist for splay tree nodes, allocated on obstack, and
chained together by their 'right' pointers. */
splay_tree_node free_nodes;
};
/* Allocate a copy of CORE_ADDR in MAP's obstack. */
static splay_tree_key
allocate_key (struct addrmap_mutable *map, CORE_ADDR addr)
{
CORE_ADDR *key = obstack_alloc (map->obstack, sizeof (*key));
*key = addr;
return (splay_tree_key) key;
}
/* Type-correct wrappers for splay tree access. */
static splay_tree_node
addrmap_splay_tree_lookup (struct addrmap_mutable *map, CORE_ADDR addr)
{
return splay_tree_lookup (map->tree, (splay_tree_key) &addr);
}
static splay_tree_node
addrmap_splay_tree_predecessor (struct addrmap_mutable *map, CORE_ADDR addr)
{
return splay_tree_predecessor (map->tree, (splay_tree_key) &addr);
}
static splay_tree_node
addrmap_splay_tree_successor (struct addrmap_mutable *map, CORE_ADDR addr)
{
return splay_tree_successor (map->tree, (splay_tree_key) &addr);
}
static CORE_ADDR
addrmap_node_key (splay_tree_node node)
{
return * (CORE_ADDR *) node->key;
}
static void *
addrmap_node_value (splay_tree_node node)
{
return (void *) node->value;
}
static void
addrmap_node_set_value (splay_tree_node node, void *value)
{
node->value = (splay_tree_value) value;
}
static void
addrmap_splay_tree_insert (struct addrmap_mutable *map, CORE_ADDR key, void *value)
{
splay_tree_insert (map->tree,
allocate_key (map, key),
(splay_tree_value) value);
}
/* Without changing the mapping of any address, ensure that there is a
tree node at ADDR, even if it would represent a "transition" from
one value to the same value. */
static void
force_transition (struct addrmap_mutable *this, CORE_ADDR addr)
{
splay_tree_node n
= addrmap_splay_tree_lookup (this, addr);
if (! n)
{
n = addrmap_splay_tree_predecessor (this, addr);
addrmap_splay_tree_insert (this, addr,
n ? addrmap_node_value (n) : NULL);
}
}
static void
addrmap_mutable_set_empty (struct addrmap *this,
CORE_ADDR start, CORE_ADDR end_inclusive,
void *obj)
{
struct addrmap_mutable *map = (struct addrmap_mutable *) this;
splay_tree_node n, next;
void *prior_value;
/* If we're being asked to set all empty portions of the given
address range to empty, then probably the caller is confused.
(If that turns out to be useful in some cases, then we can change
this to simply return, since overriding NULL with NULL is a
no-op.) */
gdb_assert (obj);
/* We take a two-pass approach, for simplicity.
- Establish transitions where we think we might need them.
- First pass: change all NULL regions to OBJ.
- Second pass: remove any unnecessary transitions. */
/* Establish transitions at the start and end. */
force_transition (map, start);
if (end_inclusive < CORE_ADDR_MAX)
force_transition (map, end_inclusive + 1);
/* Walk the area, changing all NULL regions to OBJ. */
for (n = addrmap_splay_tree_lookup (map, start), gdb_assert (n);
n && addrmap_node_key (n) <= end_inclusive;
n = addrmap_splay_tree_successor (map, addrmap_node_key (n)))
{
if (! addrmap_node_value (n))
addrmap_node_set_value (n, obj);
}
/* Walk the area again, removing transitions from any value to
itself. Be sure to visit both the transitions we forced
above. */
n = addrmap_splay_tree_predecessor (map, start);
prior_value = n ? addrmap_node_value (n) : NULL;
for (n = addrmap_splay_tree_lookup (map, start), gdb_assert (n);
n && (end_inclusive == CORE_ADDR_MAX
|| addrmap_node_key (n) <= end_inclusive + 1);
n = next)
{
next = addrmap_splay_tree_successor (map, addrmap_node_key (n));
if (addrmap_node_value (n) == prior_value)
splay_tree_remove (map->tree, addrmap_node_key (n));
else
prior_value = addrmap_node_value (n);
}
}
static void *
addrmap_mutable_find (struct addrmap *this, CORE_ADDR addr)
{
/* Not needed yet. */
abort ();
}
/* A function to pass to splay_tree_foreach to count the number of nodes
in the tree. */
static int
splay_foreach_count (splay_tree_node n, void *closure)
{
size_t *count = (size_t *) closure;
(*count)++;
return 0;
}
/* A function to pass to splay_tree_foreach to copy entries into a
fixed address map. */
static int
splay_foreach_copy (splay_tree_node n, void *closure)
{
struct addrmap_fixed *fixed = (struct addrmap_fixed *) closure;
struct addrmap_transition *t = &fixed->transitions[fixed->num_transitions];
t->addr = addrmap_node_key (n);
t->value = addrmap_node_value (n);
fixed->num_transitions++;
return 0;
}
static struct addrmap *
addrmap_mutable_create_fixed (struct addrmap *this, struct obstack *obstack)
{
struct addrmap_mutable *mutable = (struct addrmap_mutable *) this;
struct addrmap_fixed *fixed;
size_t num_transitions;
/* Count the number of transitions in the tree. */
num_transitions = 0;
splay_tree_foreach (mutable->tree, splay_foreach_count, &num_transitions);
/* Include an extra entry for the transition at zero (which fixed
maps have, but mutable maps do not.) */
num_transitions++;
fixed = obstack_alloc (obstack,
(sizeof (*fixed)
+ (num_transitions
* sizeof (fixed->transitions[0]))));
fixed->addrmap.funcs = &addrmap_fixed_funcs;
fixed->num_transitions = 1;
fixed->transitions[0].addr = 0;
fixed->transitions[0].value = NULL;
/* Copy all entries from the splay tree to the array, in order
of increasing address. */
splay_tree_foreach (mutable->tree, splay_foreach_copy, fixed);
/* We should have filled the array. */
gdb_assert (fixed->num_transitions == num_transitions);
return (struct addrmap *) fixed;
}
static void
addrmap_mutable_relocate (struct addrmap *this, CORE_ADDR offset)
{
/* Not needed yet. */
abort ();
}
static struct addrmap_funcs addrmap_mutable_funcs =
{
.set_empty = addrmap_mutable_set_empty,
.find = addrmap_mutable_find,
.create_fixed = addrmap_mutable_create_fixed,
.relocate = addrmap_mutable_relocate
};
static void *
splay_obstack_alloc (int size, void *closure)
{
struct addrmap_mutable *map = closure;
splay_tree_node n;
/* We should only be asked to allocate nodes and larger things.
(If, at some point in the future, this is no longer true, we can
just round up the size to sizeof (*n).) */
gdb_assert (size >= sizeof (*n));
if (map->free_nodes)
{
n = map->free_nodes;
map->free_nodes = n->right;
return n;
}
else
return obstack_alloc (map->obstack, size);
}
static void
splay_obstack_free (void *obj, void *closure)
{
struct addrmap_mutable *map = closure;
splay_tree_node n = obj;
/* We've asserted in the allocation function that we only allocate
nodes or larger things, so it should be safe to put whatever
we get passed back on the free list. */
n->right = map->free_nodes;
map->free_nodes = n;
}
/* Compare keys as CORE_ADDR * values. */
static int
splay_compare_CORE_ADDR_ptr (splay_tree_key ak, splay_tree_key bk)
{
CORE_ADDR a = * (CORE_ADDR *) ak;
CORE_ADDR b = * (CORE_ADDR *) bk;
/* We can't just return a-b here, because of over/underflow. */
if (a < b)
return -1;
else if (a == b)
return 0;
else
return 1;
}
struct addrmap *
addrmap_create_mutable (struct obstack *obstack)
{
struct addrmap_mutable *map = obstack_alloc (obstack, sizeof (*map));
map->addrmap.funcs = &addrmap_mutable_funcs;
map->obstack = obstack;
/* splay_tree_new_with_allocator uses the provided allocation
function to allocate the main splay_tree structure itself, so our
free list has to be initialized before we create the tree. */
map->free_nodes = NULL;
map->tree = splay_tree_new_with_allocator (splay_compare_CORE_ADDR_ptr,
NULL, /* no delete key */
NULL, /* no delete value */
splay_obstack_alloc,
splay_obstack_free,
map);
return (struct addrmap *) map;
}
/* Initialization. */
void
_initialize_addrmap (void)
{
/* Make sure splay trees can actually hold the values we want to
store in them. */
gdb_assert (sizeof (splay_tree_key) >= sizeof (CORE_ADDR *));
gdb_assert (sizeof (splay_tree_value) >= sizeof (void *));
}

96
gdb/addrmap.h Normal file
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@ -0,0 +1,96 @@
/* addrmap.h --- interface to address map data structure.
Copyright (C) 2007 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
#ifndef ADDRMAP_H
#define ADDRMAP_H
/* An address map is essentially a table mapping CORE_ADDRs onto GDB
data structures, like blocks, symtabs, partial symtabs, and so on.
An address map uses memory proportional to the number of
transitions in the map, where a CORE_ADDR N is mapped to one
object, and N+1 is mapped to a different object.
Address maps come in two flavors: fixed, and mutable. Mutable
address maps consume more memory, but can be changed and extended.
A fixed address map, once constructed (from a mutable address map),
can't be edited. Both kinds of map are allocated in obstacks. */
/* The opaque type representing address maps. */
struct addrmap;
/* Create a mutable address map which maps every address to NULL.
Allocate entries in OBSTACK. */
struct addrmap *addrmap_create_mutable (struct obstack *obstack);
/* In the mutable address map MAP, associate the addresses from START
to END_INCLUSIVE that are currently associated with NULL with OBJ
instead. Addresses mapped to an object other than NULL are left
unchanged.
As the name suggests, END_INCLUSIVE is also mapped to OBJ. This
convention is unusual, but it allows callers to accurately specify
ranges that abut the top of the address space, and ranges that
cover the entire address space.
This operation seems a bit complicated for a primitive: if it's
needed, why not just have a simpler primitive operation that sets a
range to a value, wiping out whatever was there before, and then
let the caller construct more complicated operations from that,
along with some others for traversal?
It turns out this is the mutation operation we want to use all the
time, at least for now. Our immediate use for address maps is to
represent lexical blocks whose address ranges are not contiguous.
We walk the tree of lexical blocks present in the debug info, and
only create 'struct block' objects after we've traversed all a
block's children. If a lexical block declares no local variables
(and isn't the lexical block for a function's body), we omit it
from GDB's data structures entirely.
However, this menas that we don't decide to create a block (and
thus record it in the address map) until after we've traversed its
children. If we do decide to create the block, we do so at a time
when all its children have already been recorded in the map. So
this operation --- change only those addresses left unset --- is
actually the operation we want to use every time.
It seems simpler to let the code which operates on the
representation directly deal with the hair of implementing these
semantics than to provide an interface which allows it to be
implemented efficiently, but doesn't reveal too much of the
representation. */
void addrmap_set_empty (struct addrmap *map,
CORE_ADDR start, CORE_ADDR end_inclusive,
void *obj);
/* Return the object associated with ADDR in MAP. */
void *addrmap_find (struct addrmap *map, CORE_ADDR addr);
/* Create a fixed address map which is a copy of the mutable address
map ORIGINAL. Allocate entries in OBSTACK. */
struct addrmap *addrmap_create_fixed (struct addrmap *original,
struct obstack *obstack);
/* Relocate all the addresses in MAP by OFFSET. (This can be applied
to either mutable or immutable maps.) */
void addrmap_relocate (struct addrmap *map, CORE_ADDR offset);
#endif /* ADDRMAP_H */

45
gdb/block.c
View File

@ -23,6 +23,7 @@
#include "symfile.h"
#include "gdb_obstack.h"
#include "cp-support.h"
#include "addrmap.h"
/* This is used by struct block to store namespace-related info for
C++ files, namely using declarations and the current namespace in
@ -63,14 +64,14 @@ block_function (const struct block *bl)
return BLOCK_FUNCTION (bl);
}
/* Return the blockvector immediately containing the innermost lexical block
containing the specified pc value and section, or 0 if there is none.
PINDEX is a pointer to the index value of the block. If PINDEX
is NULL, we don't pass this information back to the caller. */
/* Return the blockvector immediately containing the innermost lexical
block containing the specified pc value and section, or 0 if there
is none. PBLOCK is a pointer to the block. If PBLOCK is NULL, we
don't pass this information back to the caller. */
struct blockvector *
blockvector_for_pc_sect (CORE_ADDR pc, struct bfd_section *section,
int *pindex, struct symtab *symtab)
struct block **pblock, struct symtab *symtab)
{
struct block *b;
int bot, top, half;
@ -85,11 +86,27 @@ blockvector_for_pc_sect (CORE_ADDR pc, struct bfd_section *section,
}
bl = BLOCKVECTOR (symtab);
b = BLOCKVECTOR_BLOCK (bl, 0);
/* Then search that symtab for the smallest block that wins. */
/* Use binary search to find the last block that starts before PC. */
/* If we have an addrmap mapping code addresses to blocks, then use
that. */
if (BLOCKVECTOR_MAP (bl))
{
b = addrmap_find (BLOCKVECTOR_MAP (bl), pc);
if (b)
{
if (pblock)
*pblock = b;
return bl;
}
else
return 0;
}
/* Otherwise, use binary search to find the last block that starts
before PC. */
bot = 0;
top = BLOCKVECTOR_NBLOCKS (bl);
@ -110,8 +127,8 @@ blockvector_for_pc_sect (CORE_ADDR pc, struct bfd_section *section,
b = BLOCKVECTOR_BLOCK (bl, bot);
if (BLOCK_END (b) > pc)
{
if (pindex)
*pindex = bot;
if (pblock)
*pblock = b;
return bl;
}
bot--;
@ -124,10 +141,10 @@ blockvector_for_pc_sect (CORE_ADDR pc, struct bfd_section *section,
Backward compatibility, no section. */
struct blockvector *
blockvector_for_pc (CORE_ADDR pc, int *pindex)
blockvector_for_pc (CORE_ADDR pc, struct block **pblock)
{
return blockvector_for_pc_sect (pc, find_pc_mapped_section (pc),
pindex, NULL);
pblock, NULL);
}
/* Return the innermost lexical block containing the specified pc value
@ -137,11 +154,11 @@ struct block *
block_for_pc_sect (CORE_ADDR pc, struct bfd_section *section)
{
struct blockvector *bl;
int index;
struct block *b;
bl = blockvector_for_pc_sect (pc, section, &index, NULL);
bl = blockvector_for_pc_sect (pc, section, &b, NULL);
if (bl)
return BLOCKVECTOR_BLOCK (bl, index);
return b;
return 0;
}

11
gdb/block.h
View File

@ -28,6 +28,7 @@ struct block_namespace_info;
struct using_direct;
struct obstack;
struct dictionary;
struct addrmap;
/* All of the name-scope contours of the program
are represented by `struct block' objects.
@ -115,12 +116,17 @@ struct blockvector
{
/* Number of blocks in the list. */
int nblocks;
/* An address map mapping addresses to blocks in this blockvector.
This pointer is zero if the blocks' start and end addresses are
enough. */
struct addrmap *map;
/* The blocks themselves. */
struct block *block[1];
};
#define BLOCKVECTOR_NBLOCKS(blocklist) (blocklist)->nblocks
#define BLOCKVECTOR_BLOCK(blocklist,n) (blocklist)->block[n]
#define BLOCKVECTOR_MAP(blocklist) ((blocklist)->map)
/* Special block numbers */
@ -130,10 +136,11 @@ extern struct symbol *block_function (const struct block *);
extern int contained_in (const struct block *, const struct block *);
extern struct blockvector *blockvector_for_pc (CORE_ADDR, int *);
extern struct blockvector *blockvector_for_pc (CORE_ADDR, struct block **);
extern struct blockvector *blockvector_for_pc_sect (CORE_ADDR, asection *,
int *, struct symtab *);
struct block **,
struct symtab *);
extern struct block *block_for_pc (CORE_ADDR);

4
gdb/breakpoint.c
View File

@ -5747,12 +5747,10 @@ resolve_sal_pc (struct symtab_and_line *sal)
struct blockvector *bv;
struct block *b;
struct symbol *sym;
int index;
bv = blockvector_for_pc_sect (sal->pc, 0, &index, sal->symtab);
bv = blockvector_for_pc_sect (sal->pc, 0, &b, sal->symtab);
if (bv != NULL)
{
b = BLOCKVECTOR_BLOCK (bv, index);
sym = block_function (b);
if (sym != NULL)
{

80
gdb/buildsym.c
View File

@ -43,6 +43,7 @@
#include "block.h"
#include "cp-support.h"
#include "dictionary.h"
#include "addrmap.h"
/* Ask buildsym.h to define the vars it normally declares `extern'. */
#define EXTERN
@ -67,6 +68,23 @@ static struct pending *free_pendings;
otherwise empty symtab from being tossed. */
static int have_line_numbers;
/* The mutable address map for the compilation unit whose symbols
we're currently reading. The symtabs' shared blockvector will
point to a fixed copy of this. */
static struct addrmap *pending_addrmap;
/* The obstack on which we allocate pending_addrmap.
If pending_addrmap is NULL, this is uninitialized; otherwise, it is
initialized (and holds pending_addrmap). */
static struct obstack pending_addrmap_obstack;
/* Non-zero if we recorded any ranges in the addrmap that are
different from those in the blockvector already. We set this to
zero when we start processing a symfile, and if it's still zero at
the end, then we just toss the addrmap. */
static int pending_addrmap_interesting;
static int compare_line_numbers (const void *ln1p, const void *ln2p);
@ -195,6 +213,12 @@ really_free_pendings (void *dummy)
if (pending_macros)
free_macro_table (pending_macros);
if (pending_addrmap)
{
obstack_free (&pending_addrmap_obstack, NULL);
pending_addrmap = NULL;
}
}
/* This function is called to discard any pending blocks. */
@ -211,7 +235,7 @@ free_pending_blocks (void)
the order the symbols have in the list (reversed from the input
file). Put the block on the list of pending blocks. */
void
struct block *
finish_block (struct symbol *symbol, struct pending **listhead,
struct pending_block *old_blocks,
CORE_ADDR start, CORE_ADDR end,
@ -423,6 +447,8 @@ finish_block (struct symbol *symbol, struct pending **listhead,
}
record_pending_block (objfile, block, opblock);
return block;
}
@ -454,6 +480,38 @@ record_pending_block (struct objfile *objfile, struct block *block,
}
}
/* Record that the range of addresses from START to END_INCLUSIVE
(inclusive, like it says) belongs to BLOCK. BLOCK's start and end
addresses must be set already. You must apply this function to all
BLOCK's children before applying it to BLOCK.
If a call to this function complicates the picture beyond that
already provided by BLOCK_START and BLOCK_END, then we create an
address map for the block. */
void
record_block_range (struct block *block,
CORE_ADDR start, CORE_ADDR end_inclusive)
{
/* If this is any different from the range recorded in the block's
own BLOCK_START and BLOCK_END, then note that the address map has
become interesting. Note that even if this block doesn't have
any "interesting" ranges, some later block might, so we still
need to record this block in the addrmap. */
if (start != BLOCK_START (block)
|| end_inclusive + 1 != BLOCK_END (block))
pending_addrmap_interesting = 1;
if (! pending_addrmap)
{
obstack_init (&pending_addrmap_obstack);
pending_addrmap = addrmap_create_mutable (&pending_addrmap_obstack);
}
addrmap_set_empty (pending_addrmap, start, end_inclusive, block);
}
static struct blockvector *
make_blockvector (struct objfile *objfile)
{
@ -486,6 +544,14 @@ make_blockvector (struct objfile *objfile)
free_pending_blocks ();
/* If we needed an address map for this symtab, record it in the
blockvector. */
if (pending_addrmap && pending_addrmap_interesting)
BLOCKVECTOR_MAP (blockvector)
= addrmap_create_fixed (pending_addrmap, &objfile->objfile_obstack);
else
BLOCKVECTOR_MAP (blockvector) = 0;
/* Some compilers output blocks in the wrong order, but we depend on
their being in the right order so we can binary search. Check the
order and moan about it. */
@ -808,6 +874,9 @@ start_symtab (char *name, char *dirname, CORE_ADDR start_addr)
}
context_stack_depth = 0;
/* We shouldn't have any address map at this point. */
gdb_assert (! pending_addrmap);
/* Set up support for C++ namespace support, in case we need it. */
cp_initialize_namespace ();
@ -1083,6 +1152,11 @@ end_symtab (CORE_ADDR end_addr, struct objfile *objfile, int section)
last_source_file = NULL;
current_subfile = NULL;
pending_macros = NULL;
if (pending_addrmap)
{
obstack_free (&pending_addrmap_obstack, NULL);
pending_addrmap = NULL;
}
return symtab;
}
@ -1196,6 +1270,10 @@ buildsym_init (void)
global_symbols = NULL;
pending_blocks = NULL;
pending_macros = NULL;
/* We shouldn't have any address map at this point. */
gdb_assert (! pending_addrmap);
pending_addrmap_interesting = 0;
}
/* Initialize anything that needs initializing when a completely new

14
gdb/buildsym.h
View File

@ -22,6 +22,7 @@
struct objfile;
struct symbol;
struct addrmap;
/* This module provides definitions used for creating and adding to
the symbol table. These routines are called from various symbol-
@ -230,11 +231,14 @@ extern void add_symbol_to_list (struct symbol *symbol,
extern struct symbol *find_symbol_in_list (struct pending *list,
char *name, int length);
extern void finish_block (struct symbol *symbol,
struct pending **listhead,
struct pending_block *old_blocks,
CORE_ADDR start, CORE_ADDR end,
struct objfile *objfile);
extern struct block *finish_block (struct symbol *symbol,
struct pending **listhead,
struct pending_block *old_blocks,
CORE_ADDR start, CORE_ADDR end,
struct objfile *objfile);
extern void record_block_range (struct block *,
CORE_ADDR start, CORE_ADDR end_inclusive);
extern void really_free_pendings (void *dummy);

3
gdb/defs.h
View File

@ -84,6 +84,9 @@ typedef bfd_byte gdb_byte;
/* An address in the program being debugged. Host byte order. */
typedef bfd_vma CORE_ADDR;
/* The largest CORE_ADDR value. */
#define CORE_ADDR_MAX (~ (CORE_ADDR) 0)
/* This is to make sure that LONGEST is at least as big as CORE_ADDR. */
#ifndef LONGEST

122
gdb/dwarf2read.c
View File

@ -895,6 +895,9 @@ static void get_scope_pc_bounds (struct die_info *,
CORE_ADDR *, CORE_ADDR *,
struct dwarf2_cu *);
static void dwarf2_record_block_ranges (struct die_info *, struct block *,
CORE_ADDR, struct dwarf2_cu *);
static void dwarf2_add_field (struct field_info *, struct die_info *,
struct dwarf2_cu *);
@ -2910,6 +2913,7 @@ read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
const char *previous_prefix = processing_current_prefix;
struct cleanup *back_to = NULL;
CORE_ADDR baseaddr;
struct block *block;
baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
@ -2993,8 +2997,11 @@ read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
new = pop_context ();
/* Make a block for the local symbols within. */
finish_block (new->name, &local_symbols, new->old_blocks,
lowpc, highpc, objfile);
block = finish_block (new->name, &local_symbols, new->old_blocks,
lowpc, highpc, objfile);
/* If we have address ranges, record them. */
dwarf2_record_block_ranges (die, block, baseaddr, cu);
/* In C++, we can have functions nested inside functions (e.g., when
a function declares a class that has methods). This means that
@ -3051,8 +3058,21 @@ read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
if (local_symbols != NULL)
{
finish_block (0, &local_symbols, new->old_blocks, new->start_addr,
highpc, objfile);
struct block *block
= finish_block (0, &local_symbols, new->old_blocks, new->start_addr,
highpc, objfile);
/* Note that recording ranges after traversing children, as we
do here, means that recording a parent's ranges entails
walking across all its children's ranges as they appear in
the address map, which is quadratic behavior.
It would be nicer to record the parent's ranges before
traversing its children, simply overriding whatever you find
there. But since we don't even decide whether to create a
block until after we've traversed its children, that's hard
to do. */
dwarf2_record_block_ranges (die, block, baseaddr, cu);
}
local_symbols = new->locals;
}
@ -3296,6 +3316,100 @@ get_scope_pc_bounds (struct die_info *die,
*highpc = best_high;
}
/* Record the address ranges for BLOCK, offset by BASEADDR, as given
in DIE. */
static void
dwarf2_record_block_ranges (struct die_info *die, struct block *block,
CORE_ADDR baseaddr, struct dwarf2_cu *cu)
{
struct attribute *attr;
attr = dwarf2_attr (die, DW_AT_high_pc, cu);
if (attr)
{
CORE_ADDR high = DW_ADDR (attr);
attr = dwarf2_attr (die, DW_AT_low_pc, cu);
if (attr)
{
CORE_ADDR low = DW_ADDR (attr);
record_block_range (block, baseaddr + low, baseaddr + high - 1);
}
}
attr = dwarf2_attr (die, DW_AT_ranges, cu);
if (attr)
{
bfd *obfd = cu->objfile->obfd;
/* The value of the DW_AT_ranges attribute is the offset of the
address range list in the .debug_ranges section. */
unsigned long offset = DW_UNSND (attr);
gdb_byte *buffer = dwarf2_per_objfile->ranges_buffer + offset;
/* For some target architectures, but not others, the
read_address function sign-extends the addresses it returns.
To recognize base address selection entries, we need a
mask. */
unsigned int addr_size = cu->header.addr_size;
CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
/* The base address, to which the next pair is relative. Note
that this 'base' is a DWARF concept: most entries in a range
list are relative, to reduce the number of relocs against the
debugging information. This is separate from this function's
'baseaddr' argument, which GDB uses to relocate debugging
information from a shared library based on the address at
which the library was loaded. */
CORE_ADDR base = cu->header.base_address;
int base_known = cu->header.base_known;
if (offset >= dwarf2_per_objfile->ranges_size)
{
complaint (&symfile_complaints,
_("Offset %lu out of bounds for DW_AT_ranges attribute"),
offset);
return;
}
for (;;)
{
unsigned int bytes_read;
CORE_ADDR start, end;
start = read_address (obfd, buffer, cu, &bytes_read);
buffer += bytes_read;
end = read_address (obfd, buffer, cu, &bytes_read);
buffer += bytes_read;
/* Did we find the end of the range list? */
if (start == 0 && end == 0)
break;
/* Did we find a base address selection entry? */
else if ((start & base_select_mask) == base_select_mask)
{
base = end;
base_known = 1;
}
/* We found an ordinary address range. */
else
{
if (!base_known)
{
complaint (&symfile_complaints,
_("Invalid .debug_ranges data (no base address)"));
return;
}
record_block_range (block,
baseaddr + base + start,
baseaddr + base + end - 1);
}
}
}
}
/* Add an aggregate field to the field list. */
static void

4
gdb/objfiles.c
View File

@ -47,6 +47,7 @@
#include "block.h"
#include "dictionary.h"
#include "source.h"
#include "addrmap.h"
/* Prototypes for local functions */
@ -564,6 +565,9 @@ objfile_relocate (struct objfile *objfile, struct section_offsets *new_offsets)
b = BLOCKVECTOR_BLOCK (bv, i);
BLOCK_START (b) += ANOFFSET (delta, s->block_line_section);
BLOCK_END (b) += ANOFFSET (delta, s->block_line_section);
if (BLOCKVECTOR_MAP (bv))
addrmap_relocate (BLOCKVECTOR_MAP (bv),
ANOFFSET (delta, s->block_line_section));
ALL_BLOCK_SYMBOLS (b, iter, sym)
{

4
gdb/stack.c
View File

@ -1471,6 +1471,9 @@ static void
print_frame_label_vars (struct frame_info *frame, int this_level_only,
struct ui_file *stream)
{
#if 1
fprintf_filtered (stream, "print_frame_label_vars disabled.\n");
#else
struct blockvector *bl;
struct block *block = get_frame_block (frame, 0);
int values_printed = 0;
@ -1531,6 +1534,7 @@ print_frame_label_vars (struct frame_info *frame, int this_level_only,
if (!values_printed && !this_level_only)
fprintf_filtered (stream, _("No catches.\n"));
#endif
}
void