/* Implements exception handling.
- Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001 Free Software Foundation, Inc.
+ Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
+ 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
Contributed by Mike Stump <mrs@cygnus.com>.
This file is part of GCC.
#include "ggc.h"
#include "tm_p.h"
#include "target.h"
+#include "langhooks.h"
/* Provide defaults for stuff that may not be defined when using
sjlj exceptions. */
/* Map a type to a runtime object to match type. */
tree (*lang_eh_runtime_type) PARAMS ((tree));
-/* A list of labels used for exception handlers. */
-rtx exception_handler_labels;
+/* A hash table of label to region number. */
+
+struct ehl_map_entry GTY(())
+{
+ rtx label;
+ struct eh_region *region;
+};
static int call_site_base;
-static unsigned int sjlj_funcdef_number;
-static htab_t type_to_runtime_map;
+static GTY ((param_is (union tree_node)))
+ htab_t type_to_runtime_map;
/* Describe the SjLj_Function_Context structure. */
-static tree sjlj_fc_type_node;
+static GTY(()) tree sjlj_fc_type_node;
static int sjlj_fc_call_site_ofs;
static int sjlj_fc_data_ofs;
static int sjlj_fc_personality_ofs;
static int sjlj_fc_jbuf_ofs;
\f
/* Describes one exception region. */
-struct eh_region
+struct eh_region GTY(())
{
/* The immediately surrounding region. */
struct eh_region *outer;
/* An identifier for this region. */
int region_number;
+ /* When a region is deleted, its parents inherit the REG_EH_REGION
+ numbers already assigned. */
+ bitmap aka;
+
/* Each region does exactly one thing. */
enum eh_region_type
{
} type;
/* Holds the action to perform based on the preceding type. */
- union {
+ union eh_region_u {
/* A list of catch blocks, a surrounding try block,
and the label for continuing after a catch. */
- struct {
+ struct eh_region_u_try {
struct eh_region *catch;
struct eh_region *last_catch;
struct eh_region *prev_try;
rtx continue_label;
- } try;
+ } GTY ((tag ("ERT_TRY"))) try;
/* The list through the catch handlers, the list of type objects
matched, and the list of associated filters. */
- struct {
+ struct eh_region_u_catch {
struct eh_region *next_catch;
struct eh_region *prev_catch;
tree type_list;
tree filter_list;
- } catch;
+ } GTY ((tag ("ERT_CATCH"))) catch;
/* A tree_list of allowed types. */
- struct {
+ struct eh_region_u_allowed {
tree type_list;
int filter;
- } allowed;
+ } GTY ((tag ("ERT_ALLOWED_EXCEPTIONS"))) allowed;
- /* The type given by a call to "throw foo();", or discovered
+ /* The type given by a call to "throw foo();", or discovered
for a throw. */
- struct {
+ struct eh_region_u_throw {
tree type;
- } throw;
+ } GTY ((tag ("ERT_THROW"))) throw;
/* Retain the cleanup expression even after expansion so that
we can match up fixup regions. */
- struct {
+ struct eh_region_u_cleanup {
tree exp;
- } cleanup;
+ } GTY ((tag ("ERT_CLEANUP"))) cleanup;
/* The real region (by expression and by pointer) that fixup code
should live in. */
- struct {
+ struct eh_region_u_fixup {
tree cleanup_exp;
struct eh_region *real_region;
- } fixup;
- } u;
+ } GTY ((tag ("ERT_FIXUP"))) fixup;
+ } GTY ((desc ("%0.type"))) u;
/* Entry point for this region's handler before landing pads are built. */
rtx label;
rtx resume;
};
+struct call_site_record GTY(())
+{
+ rtx landing_pad;
+ int action;
+};
+
/* Used to save exception status for each function. */
-struct eh_status
+struct eh_status GTY(())
{
/* The tree of all regions for this function. */
struct eh_region *region_tree;
/* The same information as an indexable array. */
- struct eh_region **region_array;
+ struct eh_region ** GTY ((length ("%h.last_region_number"))) region_array;
/* The most recently open region. */
struct eh_region *cur_region;
/* This is the region for which we are processing catch blocks. */
struct eh_region *try_region;
- /* A stack (TREE_LIST) of lists of handlers. The TREE_VALUE of each
- node is itself a TREE_CHAINed list of handlers for regions that
- are not yet closed. The TREE_VALUE of each entry contains the
- handler for the corresponding entry on the ehstack. */
- tree protect_list;
-
rtx filter;
rtx exc_ptr;
varray_type ehspec_data;
varray_type action_record_data;
- struct call_site_record
- {
- rtx landing_pad;
- int action;
- } *call_site_data;
+ htab_t GTY ((param_is (struct ehl_map_entry))) exception_handler_label_map;
+
+ struct call_site_record * GTY ((length ("%h.call_site_data_used")))
+ call_site_data;
int call_site_data_used;
int call_site_data_size;
};
\f
-static void mark_eh_region PARAMS ((struct eh_region *));
-
static int t2r_eq PARAMS ((const PTR,
const PTR));
static hashval_t t2r_hash PARAMS ((const PTR));
-static int t2r_mark_1 PARAMS ((PTR *, PTR));
-static void t2r_mark PARAMS ((PTR));
static void add_type_for_runtime PARAMS ((tree));
static tree lookup_type_for_runtime PARAMS ((tree));
static void collect_eh_region_array PARAMS ((void));
static void resolve_fixup_regions PARAMS ((void));
static void remove_fixup_regions PARAMS ((void));
+static void remove_unreachable_regions PARAMS ((rtx));
static void convert_from_eh_region_ranges_1 PARAMS ((rtx *, int *, int));
static struct eh_region *duplicate_eh_region_1 PARAMS ((struct eh_region *,
PARAMS ((rtx, struct sjlj_lp_info *));
static void sjlj_build_landing_pads PARAMS ((void));
+static hashval_t ehl_hash PARAMS ((const PTR));
+static int ehl_eq PARAMS ((const PTR,
+ const PTR));
+static void add_ehl_entry PARAMS ((rtx,
+ struct eh_region *));
static void remove_exception_handler_label PARAMS ((rtx));
static void remove_eh_handler PARAMS ((struct eh_region *));
+static int for_each_eh_label_1 PARAMS ((PTR *, PTR));
struct reachable_info;
\f
/* Routine to see if exception handling is turned on.
DO_WARN is non-zero if we want to inform the user that exception
- handling is turned off.
+ handling is turned off.
This is used to ensure that -fexceptions has been specified if the
compiler tries to use any exception-specific functions. */
void
init_eh ()
{
- ggc_add_rtx_root (&exception_handler_labels, 1);
-
if (! flag_exceptions)
return;
- type_to_runtime_map = htab_create (31, t2r_hash, t2r_eq, NULL);
- ggc_add_root (&type_to_runtime_map, 1, sizeof (htab_t), t2r_mark);
+ type_to_runtime_map = htab_create_ggc (31, t2r_hash, t2r_eq, NULL);
/* Create the SjLj_Function_Context structure. This should match
the definition in unwind-sjlj.c. */
{
tree f_jbuf, f_per, f_lsda, f_prev, f_cs, f_data, tmp;
- sjlj_fc_type_node = make_lang_type (RECORD_TYPE);
- ggc_add_tree_root (&sjlj_fc_type_node, 1);
+ sjlj_fc_type_node = (*lang_hooks.types.make_type) (RECORD_TYPE);
f_prev = build_decl (FIELD_DECL, get_identifier ("__prev"),
build_pointer_type (sjlj_fc_type_node));
DECL_FIELD_CONTEXT (f_cs) = sjlj_fc_type_node;
tmp = build_index_type (build_int_2 (4 - 1, 0));
- tmp = build_array_type (type_for_mode (word_mode, 1), tmp);
+ tmp = build_array_type ((*lang_hooks.types.type_for_mode) (word_mode, 1),
+ tmp);
f_data = build_decl (FIELD_DECL, get_identifier ("__data"), tmp);
DECL_FIELD_CONTEXT (f_data) = sjlj_fc_type_node;
void
init_eh_for_function ()
{
- cfun->eh = (struct eh_status *) xcalloc (1, sizeof (struct eh_status));
-}
-
-/* Mark EH for GC. */
-
-static void
-mark_eh_region (region)
- struct eh_region *region;
-{
- if (! region)
- return;
-
- switch (region->type)
- {
- case ERT_UNKNOWN:
- /* This can happen if a nested function is inside the body of a region
- and we do a GC as part of processing it. */
- break;
- case ERT_CLEANUP:
- ggc_mark_tree (region->u.cleanup.exp);
- break;
- case ERT_TRY:
- ggc_mark_rtx (region->u.try.continue_label);
- break;
- case ERT_CATCH:
- ggc_mark_tree (region->u.catch.type_list);
- ggc_mark_tree (region->u.catch.filter_list);
- break;
- case ERT_ALLOWED_EXCEPTIONS:
- ggc_mark_tree (region->u.allowed.type_list);
- break;
- case ERT_MUST_NOT_THROW:
- break;
- case ERT_THROW:
- ggc_mark_tree (region->u.throw.type);
- break;
- case ERT_FIXUP:
- ggc_mark_tree (region->u.fixup.cleanup_exp);
- break;
- default:
- abort ();
- }
-
- ggc_mark_rtx (region->label);
- ggc_mark_rtx (region->resume);
- ggc_mark_rtx (region->landing_pad);
- ggc_mark_rtx (region->post_landing_pad);
-}
-
-void
-mark_eh_status (eh)
- struct eh_status *eh;
-{
- int i;
-
- if (eh == 0)
- return;
-
- /* If we've called collect_eh_region_array, use it. Otherwise walk
- the tree non-recursively. */
- if (eh->region_array)
- {
- for (i = eh->last_region_number; i > 0; --i)
- {
- struct eh_region *r = eh->region_array[i];
- if (r && r->region_number == i)
- mark_eh_region (r);
- }
- }
- else if (eh->region_tree)
- {
- struct eh_region *r = eh->region_tree;
- while (1)
- {
- mark_eh_region (r);
- if (r->inner)
- r = r->inner;
- else if (r->next_peer)
- r = r->next_peer;
- else
- {
- do {
- r = r->outer;
- if (r == NULL)
- goto tree_done;
- } while (r->next_peer == NULL);
- r = r->next_peer;
- }
- }
- tree_done:;
- }
-
- ggc_mark_tree (eh->protect_list);
- ggc_mark_rtx (eh->filter);
- ggc_mark_rtx (eh->exc_ptr);
- ggc_mark_tree_varray (eh->ttype_data);
-
- if (eh->call_site_data)
- {
- for (i = eh->call_site_data_used - 1; i >= 0; --i)
- ggc_mark_rtx (eh->call_site_data[i].landing_pad);
- }
-
- ggc_mark_rtx (eh->ehr_stackadj);
- ggc_mark_rtx (eh->ehr_handler);
- ggc_mark_rtx (eh->ehr_label);
-
- ggc_mark_rtx (eh->sjlj_fc);
- ggc_mark_rtx (eh->sjlj_exit_after);
-}
-
-void
-free_eh_status (f)
- struct function *f;
-{
- struct eh_status *eh = f->eh;
-
- if (eh->region_array)
- {
- int i;
- for (i = eh->last_region_number; i > 0; --i)
- {
- struct eh_region *r = eh->region_array[i];
- /* Mind we don't free a region struct more than once. */
- if (r && r->region_number == i)
- free (r);
- }
- free (eh->region_array);
- }
- else if (eh->region_tree)
- {
- struct eh_region *next, *r = eh->region_tree;
- while (1)
- {
- if (r->inner)
- r = r->inner;
- else if (r->next_peer)
- {
- next = r->next_peer;
- free (r);
- r = next;
- }
- else
- {
- do {
- next = r->outer;
- free (r);
- r = next;
- if (r == NULL)
- goto tree_done;
- } while (r->next_peer == NULL);
- next = r->next_peer;
- free (r);
- r = next;
- }
- }
- tree_done:;
- }
-
- VARRAY_FREE (eh->ttype_data);
- VARRAY_FREE (eh->ehspec_data);
- VARRAY_FREE (eh->action_record_data);
- if (eh->call_site_data)
- free (eh->call_site_data);
-
- free (eh);
- f->eh = NULL;
+ cfun->eh = (struct eh_status *)
+ ggc_alloc_cleared (sizeof (struct eh_status));
}
-
\f
/* Start an exception handling region. All instructions emitted
after this point are considered to be part of the region until
return;
/* Insert a new blank region as a leaf in the tree. */
- new_region = (struct eh_region *) xcalloc (1, sizeof (*new_region));
+ new_region = (struct eh_region *) ggc_alloc_cleared (sizeof (*new_region));
cur_region = cfun->eh->cur_region;
new_region->outer = cur_region;
if (cur_region)
/* Give the language a chance to specify an action to be taken if an
exception is thrown that would propagate out of the HANDLER. */
- protect_cleanup_actions
- = (lang_protect_cleanup_actions
- ? (*lang_protect_cleanup_actions) ()
+ protect_cleanup_actions
+ = (lang_protect_cleanup_actions
+ ? (*lang_protect_cleanup_actions) ()
: NULL_TREE);
if (protect_cleanup_actions)
/* In case this cleanup involves an inline destructor with a try block in
it, we need to save the EH return data registers around it. */
- data_save[0] = gen_reg_rtx (Pmode);
+ data_save[0] = gen_reg_rtx (ptr_mode);
emit_move_insn (data_save[0], get_exception_pointer (cfun));
data_save[1] = gen_reg_rtx (word_mode);
emit_move_insn (data_save[1], get_exception_filter (cfun));
/* Begin a catch clause. TYPE is the type caught, a list of such types, or
null if this is a catch-all clause. Providing a type list enables to
associate the catch region with potentially several exception types, which
- is useful e.g. for Ada. */
+ is useful e.g. for Ada. */
void
expand_start_catch (type_or_list)
tree type_node;
if (TREE_CODE (type_or_list) != TREE_LIST)
- type_list = tree_cons (NULL_TREE, type_or_list, NULL_TREE);
+ type_list = tree_cons (NULL_TREE, type_or_list, NULL_TREE);
type_node = type_list;
for (; type_node; type_node = TREE_CHAIN (type_node))
- add_type_for_runtime (TREE_VALUE (type_node));
+ add_type_for_runtime (TREE_VALUE (type_node));
}
expand_eh_region_start ();
rtx exc_ptr = fun->eh->exc_ptr;
if (fun == cfun && ! exc_ptr)
{
- exc_ptr = gen_reg_rtx (Pmode);
+ exc_ptr = gen_reg_rtx (ptr_mode);
fun->eh->exc_ptr = exc_ptr;
}
return exc_ptr;
return filter;
}
\f
-/* Begin a region that will contain entries created with
- add_partial_entry. */
-
-void
-begin_protect_partials ()
-{
- /* Push room for a new list. */
- cfun->eh->protect_list
- = tree_cons (NULL_TREE, NULL_TREE, cfun->eh->protect_list);
-}
-
-/* Start a new exception region for a region of code that has a
- cleanup action and push the HANDLER for the region onto
- protect_list. All of the regions created with add_partial_entry
- will be ended when end_protect_partials is invoked. */
-
-void
-add_partial_entry (handler)
- tree handler;
-{
- expand_eh_region_start ();
-
- /* ??? This comment was old before the most recent rewrite. We
- really ought to fix the callers at some point. */
- /* For backwards compatibility, we allow callers to omit calls to
- begin_protect_partials for the outermost region. So, we must
- explicitly do so here. */
- if (!cfun->eh->protect_list)
- begin_protect_partials ();
-
- /* Add this entry to the front of the list. */
- TREE_VALUE (cfun->eh->protect_list)
- = tree_cons (NULL_TREE, handler, TREE_VALUE (cfun->eh->protect_list));
-}
-
-/* End all the pending exception regions on protect_list. */
-
-void
-end_protect_partials ()
-{
- tree t;
-
- /* ??? This comment was old before the most recent rewrite. We
- really ought to fix the callers at some point. */
- /* For backwards compatibility, we allow callers to omit the call to
- begin_protect_partials for the outermost region. So,
- PROTECT_LIST may be NULL. */
- if (!cfun->eh->protect_list)
- return;
-
- /* Pop the topmost entry. */
- t = TREE_VALUE (cfun->eh->protect_list);
- cfun->eh->protect_list = TREE_CHAIN (cfun->eh->protect_list);
-
- /* End all the exception regions. */
- for (; t; t = TREE_CHAIN (t))
- expand_eh_region_end_cleanup (TREE_VALUE (t));
-}
-
-\f
/* This section is for the exception handling specific optimization pass. */
/* Random access the exception region tree. It's just as simple to
if (! i)
return;
- array = xcalloc (cfun->eh->last_region_number + 1, sizeof (*array));
+ array = ggc_alloc_cleared ((cfun->eh->last_region_number + 1)
+ * sizeof (*array));
cfun->eh->region_array = array;
while (1)
/* Allow GC to maybe free some memory. */
if (fixup->type == ERT_CLEANUP)
- fixup->u.cleanup.exp = NULL_TREE;
+ fixup->u.cleanup.exp = NULL_TREE;
if (fixup->type != ERT_FIXUP)
continue;
}
}
+/* Remove all regions whose labels are not reachable from insns. */
+
+static void
+remove_unreachable_regions (insns)
+ rtx insns;
+{
+ int i, *uid_region_num;
+ bool *reachable;
+ struct eh_region *r;
+ rtx insn;
+
+ uid_region_num = xcalloc (get_max_uid (), sizeof(int));
+ reachable = xcalloc (cfun->eh->last_region_number + 1, sizeof(bool));
+
+ for (i = cfun->eh->last_region_number; i > 0; --i)
+ {
+ r = cfun->eh->region_array[i];
+ if (!r || r->region_number != i)
+ continue;
+
+ if (r->resume)
+ {
+ if (uid_region_num[INSN_UID (r->resume)])
+ abort ();
+ uid_region_num[INSN_UID (r->resume)] = i;
+ }
+ if (r->label)
+ {
+ if (uid_region_num[INSN_UID (r->label)])
+ abort ();
+ uid_region_num[INSN_UID (r->label)] = i;
+ }
+ if (r->type == ERT_TRY && r->u.try.continue_label)
+ {
+ if (uid_region_num[INSN_UID (r->u.try.continue_label)])
+ abort ();
+ uid_region_num[INSN_UID (r->u.try.continue_label)] = i;
+ }
+ }
+
+ for (insn = insns; insn; insn = NEXT_INSN (insn))
+ reachable[uid_region_num[INSN_UID (insn)]] = true;
+
+ for (i = cfun->eh->last_region_number; i > 0; --i)
+ {
+ r = cfun->eh->region_array[i];
+ if (r && r->region_number == i && !reachable[i])
+ {
+ /* Don't remove ERT_THROW regions if their outer region
+ is reachable. */
+ if (r->type == ERT_THROW
+ && r->outer
+ && reachable[r->outer->region_number])
+ continue;
+
+ remove_eh_handler (r);
+ }
+ }
+
+ free (reachable);
+ free (uid_region_num);
+}
+
/* Turn NOTE_INSN_EH_REGION notes into REG_EH_REGION notes for each
can_throw instruction in the region. */
free (stack);
remove_fixup_regions ();
+ remove_unreachable_regions (insns);
+}
+
+static void
+add_ehl_entry (label, region)
+ rtx label;
+ struct eh_region *region;
+{
+ struct ehl_map_entry **slot, *entry;
+
+ LABEL_PRESERVE_P (label) = 1;
+
+ entry = (struct ehl_map_entry *) ggc_alloc (sizeof (*entry));
+ entry->label = label;
+ entry->region = region;
+
+ slot = (struct ehl_map_entry **)
+ htab_find_slot (cfun->eh->exception_handler_label_map, entry, INSERT);
+
+ /* Before landing pad creation, each exception handler has its own
+ label. After landing pad creation, the exception handlers may
+ share landing pads. This is ok, since maybe_remove_eh_handler
+ only requires the 1-1 mapping before landing pad creation. */
+ if (*slot && !cfun->eh->built_landing_pads)
+ abort ();
+
+ *slot = entry;
}
void
find_exception_handler_labels ()
{
- rtx list = NULL_RTX;
int i;
- free_EXPR_LIST_list (&exception_handler_labels);
+ if (cfun->eh->exception_handler_label_map)
+ htab_empty (cfun->eh->exception_handler_label_map);
+ else
+ {
+ /* ??? The expansion factor here (3/2) must be greater than the htab
+ occupancy factor (4/3) to avoid unnecessary resizing. */
+ cfun->eh->exception_handler_label_map
+ = htab_create_ggc (cfun->eh->last_region_number * 3 / 2,
+ ehl_hash, ehl_eq, NULL);
+ }
if (cfun->eh->region_tree == NULL)
return;
struct eh_region *region = cfun->eh->region_array[i];
rtx lab;
- if (! region)
+ if (! region || region->region_number != i)
continue;
if (cfun->eh->built_landing_pads)
lab = region->landing_pad;
lab = region->label;
if (lab)
- list = alloc_EXPR_LIST (0, lab, list);
+ add_ehl_entry (lab, region);
}
/* For sjlj exceptions, need the return label to remain live until
after landing pad generation. */
if (USING_SJLJ_EXCEPTIONS && ! cfun->eh->built_landing_pads)
- list = alloc_EXPR_LIST (0, return_label, list);
-
- exception_handler_labels = list;
+ add_ehl_entry (return_label, NULL);
}
+bool
+current_function_has_exception_handlers ()
+{
+ int i;
+
+ for (i = cfun->eh->last_region_number; i > 0; --i)
+ {
+ struct eh_region *region = cfun->eh->region_array[i];
+
+ if (! region || region->region_number != i)
+ continue;
+ if (region->type != ERT_THROW)
+ return true;
+ }
+
+ return false;
+}
\f
static struct eh_region *
duplicate_eh_region_1 (o, map)
struct inline_remap *map;
{
struct eh_region *n
- = (struct eh_region *) xcalloc (1, sizeof (struct eh_region));
+ = (struct eh_region *) ggc_alloc_cleared (sizeof (struct eh_region));
n->region_number = o->region_number + cfun->eh->last_region_number;
n->type = o->type;
case ERT_THROW:
n->u.throw.type = o->u.throw.type;
-
+
default:
abort ();
}
case ERT_CATCH:
if (o->u.catch.next_catch)
- n->u.catch.next_catch = n_array[o->u.catch.next_catch->region_number];
+ n->u.catch.next_catch = n_array[o->u.catch.next_catch->region_number];
if (o->u.catch.prev_catch)
- n->u.catch.prev_catch = n_array[o->u.catch.prev_catch->region_number];
+ n->u.catch.prev_catch = n_array[o->u.catch.prev_catch->region_number];
break;
default:
n->inner = n_array[o->inner->region_number];
if (o->next_peer)
n->next_peer = n_array[o->next_peer->region_number];
-}
+}
int
duplicate_eh_regions (ifun, map)
return TYPE_HASH (TREE_PURPOSE (entry));
}
-static int
-t2r_mark_1 (slot, data)
- PTR *slot;
- PTR data ATTRIBUTE_UNUSED;
-{
- tree contents = (tree) *slot;
- ggc_mark_tree (contents);
- return 1;
-}
-
-static void
-t2r_mark (addr)
- PTR addr;
-{
- htab_traverse (*(htab_t *)addr, t2r_mark_1, NULL);
-}
-
static void
add_type_for_runtime (type)
tree type;
*slot = tree_cons (type, runtime, NULL_TREE);
}
}
-
+
static tree
lookup_type_for_runtime (type)
tree type;
\f
/* Represent an entry in @TTypes for either catch actions
or exception filter actions. */
-struct ttypes_filter
+struct ttypes_filter GTY(())
{
tree t;
int filter;
/* Look up each type in the list and encode its filter
value as a uleb128. Terminate the list with 0. */
for (; list ; list = TREE_CHAIN (list))
- push_uleb128 (&cfun->eh->ehspec_data,
+ push_uleb128 (&cfun->eh->ehspec_data,
add_ttypes_entry (ttypes_hash, TREE_VALUE (list)));
VARRAY_PUSH_UCHAR (cfun->eh->ehspec_data, 0);
}
{
int flt = add_ttypes_entry (ttypes, TREE_VALUE (tp_node));
tree flt_node = build_int_2 (flt, 0);
-
- r->u.catch.filter_list
+
+ r->u.catch.filter_list
= tree_cons (NULL_TREE, flt_node, r->u.catch.filter_list);
}
}
an action record anyway. */
int flt = add_ttypes_entry (ttypes, NULL);
tree flt_node = build_int_2 (flt, 0);
-
- r->u.catch.filter_list
+
+ r->u.catch.filter_list
= tree_cons (NULL_TREE, flt_node, r->u.catch.filter_list);
}
-
+
break;
case ERT_ALLOWED_EXCEPTIONS:
seq = get_insns ();
end_sequence ();
- emit_insns_before (seq, region->u.try.catch->label);
+ emit_insn_before (seq, region->u.try.catch->label);
break;
case ERT_ALLOWED_EXCEPTIONS:
seq = get_insns ();
end_sequence ();
- emit_insns_before (seq, region->label);
+ emit_insn_before (seq, region->label);
break;
case ERT_CLEANUP:
emit_jump (outer->post_landing_pad);
else
emit_library_call (unwind_resume_libfunc, LCT_THROW,
- VOIDmode, 1, cfun->eh->exc_ptr, Pmode);
+ VOIDmode, 1, cfun->eh->exc_ptr, ptr_mode);
seq = get_insns ();
end_sequence ();
- emit_insns_before (seq, region->resume);
+ emit_insn_before (seq, region->resume);
delete_insn (region->resume);
}
}
}
emit_move_insn (cfun->eh->exc_ptr,
- gen_rtx_REG (Pmode, EH_RETURN_DATA_REGNO (0)));
+ gen_rtx_REG (ptr_mode, EH_RETURN_DATA_REGNO (0)));
emit_move_insn (cfun->eh->filter,
gen_rtx_REG (word_mode, EH_RETURN_DATA_REGNO (1)));
seq = get_insns ();
end_sequence ();
- emit_insns_before (seq, region->post_landing_pad);
+ emit_insn_before (seq, region->post_landing_pad);
}
}
for (insn = get_insns (); insn ; insn = NEXT_INSN (insn))
{
struct eh_region *region;
+ enum reachable_code rc;
tree type_thrown;
rtx note;
/* Find the first containing region that might handle the exception.
That's the landing pad to which we will transfer control. */
+ rc = RNL_NOT_CAUGHT;
for (; region; region = region->outer)
- if (reachable_next_level (region, type_thrown, 0) != RNL_NOT_CAUGHT)
- break;
-
- if (region)
+ {
+ rc = reachable_next_level (region, type_thrown, 0);
+ if (rc != RNL_NOT_CAUGHT)
+ break;
+ }
+ if (rc == RNL_MAYBE_CAUGHT || rc == RNL_CAUGHT)
{
lp_info[region->region_number].directly_reachable = 1;
found_one = true;
index = 0;
for (i = cfun->eh->last_region_number; i > 0; --i)
- if (lp_info[i].directly_reachable
- && lp_info[i].action_index >= 0)
+ if (lp_info[i].directly_reachable)
lp_info[i].dispatch_index = index++;
/* Finally: assign call-site values. If dwarf2 terms, this would be
/* Don't separate a call from it's argument loads. */
before = insn;
if (GET_CODE (insn) == CALL_INSN)
- before = find_first_parameter_load (insn, NULL_RTX);
+ before = find_first_parameter_load (insn, NULL_RTX);
start_sequence ();
mem = adjust_address (cfun->eh->sjlj_fc, TYPE_MODE (integer_type_node),
p = get_insns ();
end_sequence ();
- emit_insns_before (p, before);
+ emit_insn_before (p, before);
last_call_site = this_call_site;
}
}
if (cfun->uses_eh_lsda)
{
char buf[20];
- ASM_GENERATE_INTERNAL_LABEL (buf, "LLSDA", sjlj_funcdef_number);
+ ASM_GENERATE_INTERNAL_LABEL (buf, "LLSDA", current_function_funcdef_no);
emit_move_insn (mem, gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (buf)));
}
else
emit_move_insn (mem, const0_rtx);
-
+
#ifdef DONT_USE_BUILTIN_SETJMP
{
rtx x, note;
if (GET_CODE (fn_begin) == NOTE
&& NOTE_LINE_NUMBER (fn_begin) == NOTE_INSN_FUNCTION_BEG)
break;
- emit_insns_after (seq, fn_begin);
+ emit_insn_after (seq, fn_begin);
}
/* Call back from expand_function_end to know where we should put
post-dominates all can_throw_internal instructions. This is
the last possible moment. */
- emit_insns_after (seq, cfun->eh->sjlj_exit_after);
+ emit_insn_after (seq, cfun->eh->sjlj_exit_after);
}
static void
start_sequence ();
emit_label (dispatch_label);
-
+
#ifndef DONT_USE_BUILTIN_SETJMP
expand_builtin_setjmp_receiver (dispatch_label);
#endif
first_reachable = 0;
for (i = cfun->eh->last_region_number; i > 0; --i)
{
- if (! lp_info[i].directly_reachable
- || lp_info[i].action_index < 0)
+ if (! lp_info[i].directly_reachable)
continue;
if (! first_reachable)
seq = get_insns ();
end_sequence ();
- emit_insns_before (seq, (cfun->eh->region_array[first_reachable]
- ->post_landing_pad));
+ emit_insn_before (seq, (cfun->eh->region_array[first_reachable]
+ ->post_landing_pad));
}
static void
connect many of the handlers, and then type information will not
be effective. Still, this is a win over previous implementations. */
- rebuild_jump_labels (get_insns ());
- find_basic_blocks (get_insns (), max_reg_num (), 0);
- cleanup_cfg (CLEANUP_PRE_LOOP);
+ cleanup_cfg (CLEANUP_PRE_LOOP | CLEANUP_NO_INSN_DEL);
/* These registers are used by the landing pads. Make sure they
have been generated. */
find_exception_handler_labels ();
rebuild_jump_labels (get_insns ());
find_basic_blocks (get_insns (), max_reg_num (), 0);
- cleanup_cfg (CLEANUP_PRE_LOOP);
+ cleanup_cfg (CLEANUP_PRE_LOOP | CLEANUP_NO_INSN_DEL);
}
\f
+static hashval_t
+ehl_hash (pentry)
+ const PTR pentry;
+{
+ struct ehl_map_entry *entry = (struct ehl_map_entry *) pentry;
+
+ /* 2^32 * ((sqrt(5) - 1) / 2) */
+ const hashval_t scaled_golden_ratio = 0x9e3779b9;
+ return CODE_LABEL_NUMBER (entry->label) * scaled_golden_ratio;
+}
+
+static int
+ehl_eq (pentry, pdata)
+ const PTR pentry;
+ const PTR pdata;
+{
+ struct ehl_map_entry *entry = (struct ehl_map_entry *) pentry;
+ struct ehl_map_entry *data = (struct ehl_map_entry *) pdata;
+
+ return entry->label == data->label;
+}
+
/* This section handles removing dead code for flow. */
-/* Remove LABEL from the exception_handler_labels list. */
+/* Remove LABEL from exception_handler_label_map. */
static void
remove_exception_handler_label (label)
rtx label;
{
- rtx *pl, l;
+ struct ehl_map_entry **slot, tmp;
- for (pl = &exception_handler_labels, l = *pl;
- XEXP (l, 0) != label;
- pl = &XEXP (l, 1), l = *pl)
- continue;
+ /* If exception_handler_label_map was not built yet,
+ there is nothing to do. */
+ if (cfun->eh->exception_handler_label_map == NULL)
+ return;
- *pl = XEXP (l, 1);
- free_EXPR_LIST_node (l);
+ tmp.label = label;
+ slot = (struct ehl_map_entry **)
+ htab_find_slot (cfun->eh->exception_handler_label_map, &tmp, NO_INSERT);
+ if (! slot)
+ abort ();
+
+ htab_clear_slot (cfun->eh->exception_handler_label_map, (void **) slot);
}
/* Splice REGION from the region tree etc. */
remove_eh_handler (region)
struct eh_region *region;
{
- struct eh_region **pp, *p;
+ struct eh_region **pp, **pp_start, *p, *outer, *inner;
rtx lab;
- int i;
/* For the benefit of efficiently handling REG_EH_REGION notes,
replace this region in the region array with its containing
region. Note that previous region deletions may result in
- multiple copies of this region in the array, so we have to
- search the whole thing. */
- for (i = cfun->eh->last_region_number; i > 0; --i)
- if (cfun->eh->region_array[i] == region)
- cfun->eh->region_array[i] = region->outer;
+ multiple copies of this region in the array, so we have a
+ list of alternate numbers by which we are known. */
+
+ outer = region->outer;
+ cfun->eh->region_array[region->region_number] = outer;
+ if (region->aka)
+ {
+ int i;
+ EXECUTE_IF_SET_IN_BITMAP (region->aka, 0, i,
+ { cfun->eh->region_array[i] = outer; });
+ }
+
+ if (outer)
+ {
+ if (!outer->aka)
+ outer->aka = BITMAP_GGC_ALLOC ();
+ if (region->aka)
+ bitmap_a_or_b (outer->aka, outer->aka, region->aka);
+ bitmap_set_bit (outer->aka, region->region_number);
+ }
if (cfun->eh->built_landing_pads)
lab = region->landing_pad;
if (lab)
remove_exception_handler_label (lab);
- if (region->outer)
- pp = ®ion->outer->inner;
+ if (outer)
+ pp_start = &outer->inner;
else
- pp = &cfun->eh->region_tree;
- for (p = *pp; p != region; pp = &p->next_peer, p = *pp)
+ pp_start = &cfun->eh->region_tree;
+ for (pp = pp_start, p = *pp; p != region; pp = &p->next_peer, p = *pp)
continue;
+ *pp = region->next_peer;
- if (region->inner)
+ inner = region->inner;
+ if (inner)
{
- for (p = region->inner; p->next_peer ; p = p->next_peer)
- p->outer = region->outer;
- p->next_peer = region->next_peer;
- p->outer = region->outer;
- *pp = region->inner;
+ for (p = inner; p->next_peer ; p = p->next_peer)
+ p->outer = outer;
+ p->outer = outer;
+
+ p->next_peer = *pp_start;
+ *pp_start = inner;
}
- else
- *pp = region->next_peer;
if (region->type == ERT_CATCH)
{
remove_eh_handler (try);
}
}
-
- free (region);
}
/* LABEL heads a basic block that is about to be deleted. If this
maybe_remove_eh_handler (label)
rtx label;
{
- int i;
+ struct ehl_map_entry **slot, tmp;
+ struct eh_region *region;
/* ??? After generating landing pads, it's not so simple to determine
if the region data is completely unused. One must examine the
if (cfun->eh->built_landing_pads)
return;
- for (i = cfun->eh->last_region_number; i > 0; --i)
+ tmp.label = label;
+ slot = (struct ehl_map_entry **)
+ htab_find_slot (cfun->eh->exception_handler_label_map, &tmp, NO_INSERT);
+ if (! slot)
+ return;
+ region = (*slot)->region;
+ if (! region)
+ return;
+
+ /* Flow will want to remove MUST_NOT_THROW regions as unreachable
+ because there is no path to the fallback call to terminate.
+ But the region continues to affect call-site data until there
+ are no more contained calls, which we don't see here. */
+ if (region->type == ERT_MUST_NOT_THROW)
{
- struct eh_region *region = cfun->eh->region_array[i];
- if (region && region->label == label)
- {
- /* Flow will want to remove MUST_NOT_THROW regions as unreachable
- because there is no path to the fallback call to terminate.
- But the region continues to affect call-site data until there
- are no more contained calls, which we don't see here. */
- if (region->type == ERT_MUST_NOT_THROW)
- {
- remove_exception_handler_label (region->label);
- region->label = NULL_RTX;
- }
- else
- remove_eh_handler (region);
- break;
- }
+ htab_clear_slot (cfun->eh->exception_handler_label_map, (void **) slot);
+ region->label = NULL_RTX;
}
+ else
+ remove_eh_handler (region);
}
+/* Invokes CALLBACK for every exception handler label. Only used by old
+ loop hackery; should not be used by new code. */
+
+void
+for_each_eh_label (callback)
+ void (*callback) PARAMS ((rtx));
+{
+ htab_traverse (cfun->eh->exception_handler_label_map, for_each_eh_label_1,
+ (void *)callback);
+}
+
+static int
+for_each_eh_label_1 (pentry, data)
+ PTR *pentry;
+ PTR data;
+{
+ struct ehl_map_entry *entry = *(struct ehl_map_entry **)pentry;
+ void (*callback) PARAMS ((rtx)) = (void (*) PARAMS ((rtx))) data;
+
+ (*callback) (entry->label);
+ return 1;
+}
\f
/* This section describes CFG exception edges for flow. */
/* For communicating between calls to reachable_next_level. */
-struct reachable_info
+struct reachable_info GTY(())
{
tree types_caught;
tree types_allowed;
/* A subroutine of reachable_next_level. If we are collecting a list
of handlers, add one. After landing pad generation, reference
it instead of the handlers themselves. Further, the handlers are
- all wired together, so by referencing one, we've got them all.
+ all wired together, so by referencing one, we've got them all.
Before landing pad generation we reference each handler individually.
LP_REGION contains the landing pad; REGION is the handler. */
info->handlers = alloc_INSN_LIST (region->label, info->handlers);
}
-/* Process one level of exception regions for reachability.
+/* Process one level of exception regions for reachability.
If TYPE_THROWN is non-null, then it is the *exact* type being
propagated. If INFO is non-null, then collect handler labels
and caught/allowed type information between invocations. */
if (type_thrown)
{
- /* If we have a at least one type match, end the search. */
+ /* If we have at least one type match, end the search. */
tree tp_node = c->u.catch.type_list;
-
+
for (; tp_node; tp_node = TREE_CHAIN (tp_node))
{
tree type = TREE_VALUE (tp_node);
/* At this point, we either don't know what type is thrown or
don't have front-end assistance to help deciding if it is
covered by one of the types in the list for this region.
-
+
We'd then like to add this region to the list of reachable
handlers since it is indeed potentially reachable based on the
- information we have.
-
+ information we have.
+
Actually, this handler is for sure not reachable if all the
types it matches have already been caught. That is, it is only
potentially reachable if at least one of the types it catches
{
info->types_caught
= tree_cons (NULL, type, info->types_caught);
-
+
maybe_reachable = true;
}
}
-
+
if (maybe_reachable)
{
add_reachable_handler (info, region, c);
-
+
/* ??? If the catch type is a base class of every allowed
type, then we know we can stop the search. */
ret = RNL_MAYBE_CAUGHT;
info->types_allowed = tree_cons (NULL_TREE,
region->u.allowed.type_list,
info->types_allowed);
-
+
/* If we have definitive information about the type hierarchy,
then we can tell if the thrown type will pass through the
filter. */
if (info && info->handlers)
{
add_reachable_handler (info, region, region);
- return RNL_CAUGHT;
+ return RNL_CAUGHT;
}
else
return RNL_BLOCKED;
case ERT_THROW:
case ERT_FIXUP:
+ case ERT_UNKNOWN:
/* Shouldn't see these here. */
break;
}
if (how == RNL_BLOCKED)
return false;
if (how != RNL_NOT_CAUGHT)
- return true;
+ return true;
}
return false;
return true;
}
-/* True if nothing in this function can throw outside this function. */
+/* Set current_function_nothrow and cfun->all_throwers_are_sibcalls. */
-bool
-nothrow_function_p ()
+void
+set_nothrow_function_flags ()
{
rtx insn;
+
+ current_function_nothrow = 1;
- if (! flag_exceptions)
- return true;
+ /* Assume cfun->all_throwers_are_sibcalls until we encounter
+ something that can throw an exception. We specifically exempt
+ CALL_INSNs that are SIBLING_CALL_P, as these are really jumps,
+ and can't throw. Most CALL_INSNs are not SIBLING_CALL_P, so this
+ is optimistic. */
+ cfun->all_throwers_are_sibcalls = 1;
+
+ if (! flag_exceptions)
+ return;
+
for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
if (can_throw_external (insn))
- return false;
+ {
+ current_function_nothrow = 0;
+
+ if (GET_CODE (insn) != CALL_INSN || !SIBLING_CALL_P (insn))
+ {
+ cfun->all_throwers_are_sibcalls = 0;
+ return;
+ }
+ }
+
for (insn = current_function_epilogue_delay_list; insn;
insn = XEXP (insn, 1))
if (can_throw_external (insn))
- return false;
+ {
+ current_function_nothrow = 0;
- return true;
+ if (GET_CODE (insn) != CALL_INSN || !SIBLING_CALL_P (insn))
+ {
+ cfun->all_throwers_are_sibcalls = 0;
+ return;
+ }
+ }
}
\f
iwhich = DBX_REGISTER_NUMBER (iwhich);
#endif
- return GEN_INT (iwhich);
+ return GEN_INT (iwhich);
}
/* Given a value extracted from the return address register or stack slot,
/* First mask out any unwanted bits. */
#ifdef MASK_RETURN_ADDR
- expand_and (addr, MASK_RETURN_ADDR, addr);
+ expand_and (Pmode, addr, MASK_RETURN_ADDR, addr);
#endif
/* Then adjust to find the real return address. */
{
/* Retrieve the filter from the head of the filter list
where we have stored it (see assign_filter_values). */
- int filter
+ int filter
= TREE_INT_CST_LOW (TREE_VALUE (c->u.catch.filter_list));
next = add_action_record (ar_hash, filter, 0);
else if (next <= 0)
next = add_action_record (ar_hash, 0, 0);
}
-
+
flt_node = c->u.catch.filter_list;
for (; flt_node; flt_node = TREE_CHAIN (flt_node))
{
{
size = (size ? size * 2 : 64);
data = (struct call_site_record *)
- xrealloc (data, sizeof (*data) * size);
+ ggc_realloc (data, sizeof (*data) * size);
cfun->eh->call_site_data = data;
cfun->eh->call_site_data_size = size;
}
are created. */
if (this_action >= -1)
{
- call_site = add_call_site (this_landing_pad,
+ call_site = add_call_site (this_landing_pad,
this_action < 0 ? 0 : this_action);
note = emit_note_before (NOTE_INSN_EH_REGION_BEG, iter);
NOTE_EH_HANDLER (note) = call_site;
int call_site_len;
#endif
int have_tt_data;
- int funcdef_number;
int tt_format_size = 0;
/* Not all functions need anything. */
if (! cfun->uses_eh_lsda)
return;
- funcdef_number = (USING_SJLJ_EXCEPTIONS
- ? sjlj_funcdef_number
- : current_funcdef_number);
-
#ifdef IA64_UNWIND_INFO
fputs ("\t.personality\t", asm_out_file);
output_addr_const (asm_out_file, eh_personality_libfunc);
{
tt_format = ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/0, /*global=*/1);
#ifdef HAVE_AS_LEB128
- ASM_GENERATE_INTERNAL_LABEL (ttype_label, "LLSDATT", funcdef_number);
+ ASM_GENERATE_INTERNAL_LABEL (ttype_label, "LLSDATT",
+ current_function_funcdef_no);
#endif
tt_format_size = size_of_encoded_value (tt_format);
assemble_align (tt_format_size * BITS_PER_UNIT);
}
- ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LLSDA", funcdef_number);
+ ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LLSDA",
+ current_function_funcdef_no);
/* The LSDA header. */
{
#ifdef HAVE_AS_LEB128
char ttype_after_disp_label[32];
- ASM_GENERATE_INTERNAL_LABEL (ttype_after_disp_label, "LLSDATTD",
- funcdef_number);
+ ASM_GENERATE_INTERNAL_LABEL (ttype_after_disp_label, "LLSDATTD",
+ current_function_funcdef_no);
dw2_asm_output_delta_uleb128 (ttype_label, ttype_after_disp_label,
"@TType base offset");
ASM_OUTPUT_LABEL (asm_out_file, ttype_after_disp_label);
#ifdef HAVE_AS_LEB128
ASM_GENERATE_INTERNAL_LABEL (cs_after_size_label, "LLSDACSB",
- funcdef_number);
+ current_function_funcdef_no);
ASM_GENERATE_INTERNAL_LABEL (cs_end_label, "LLSDACSE",
- funcdef_number);
+ current_function_funcdef_no);
dw2_asm_output_delta_uleb128 (cs_end_label, cs_after_size_label,
"Call-site table length");
ASM_OUTPUT_LABEL (asm_out_file, cs_after_size_label);
assemble_integer (value, tt_format_size,
tt_format_size * BITS_PER_UNIT, 1);
else
- dw2_asm_output_encoded_addr_rtx (tt_format, value, NULL);
+ dw2_asm_output_encoded_addr_rtx (tt_format, value, NULL);
}
#ifdef HAVE_AS_LEB128
(i ? NULL : "Exception specification table"));
function_section (current_function_decl);
-
- if (USING_SJLJ_EXCEPTIONS)
- sjlj_funcdef_number += 1;
}
+
+#include "gt-except.h"
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