/* Implements exception handling.
Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
+ Free Software Foundation, Inc.
Contributed by Mike Stump <mrs@cygnus.com>.
This file is part of GCC.
GCC 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, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
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. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
/* An exception is an event that can be signaled from within a
#include "target.h"
#include "langhooks.h"
#include "cgraph.h"
+#include "diagnostic.h"
+#include "tree-pass.h"
+#include "timevar.h"
/* Provide defaults for stuff that may not be defined when using
sjlj exceptions. */
#endif
-/* Nonzero means enable synchronous exceptions for non-call instructions. */
-int flag_non_call_exceptions;
-
/* Protect cleanup actions with must-not-throw regions, with a call
to the given failure handler. */
tree (*lang_protect_cleanup_actions) (void);
ERT_CATCH,
ERT_ALLOWED_EXCEPTIONS,
ERT_MUST_NOT_THROW,
- ERT_THROW,
- ERT_FIXUP
+ ERT_THROW
} type;
/* Holds the action to perform based on the preceding type. */
struct eh_region_u_try {
struct eh_region *catch;
struct eh_region *last_catch;
- struct eh_region *prev_try;
- rtx continue_label;
} GTY ((tag ("ERT_TRY"))) try;
/* The list through the catch handlers, the list of type objects
/* Retain the cleanup expression even after expansion so that
we can match up fixup regions. */
struct eh_region_u_cleanup {
- tree exp;
struct eh_region *prev_try;
} GTY ((tag ("ERT_CLEANUP"))) cleanup;
-
- /* The real region (by expression and by pointer) that fixup code
- should live in. */
- struct eh_region_u_fixup {
- tree cleanup_exp;
- struct eh_region *real_region;
- bool resolved;
- } GTY ((tag ("ERT_FIXUP"))) fixup;
} GTY ((desc ("%0.type"))) u;
/* Entry point for this region's handler before landing pads are built. */
rtx label;
+ tree tree_label;
/* Entry point for this region's handler from the runtime eh library. */
rtx landing_pad;
unsigned may_contain_throw : 1;
};
+typedef struct eh_region *eh_region;
+
struct call_site_record GTY(())
{
rtx landing_pad;
int action;
};
+DEF_VEC_P(eh_region);
+DEF_VEC_ALLOC_P(eh_region, gc);
+
/* Used to save exception status for each function. */
struct eh_status GTY(())
{
struct eh_region *region_tree;
/* The same information as an indexable array. */
- struct eh_region ** GTY ((length ("%h.last_region_number"))) region_array;
+ VEC(eh_region,gc) *region_array;
/* The most recently open region. */
struct eh_region *cur_region;
int built_landing_pads;
int last_region_number;
- varray_type ttype_data;
+ VEC(tree,gc) *ttype_data;
varray_type ehspec_data;
varray_type action_record_data;
rtx sjlj_fc;
rtx sjlj_exit_after;
-};
+ htab_t GTY((param_is (struct throw_stmt_node))) throw_stmt_table;
+};
\f
static int t2r_eq (const void *, const void *);
static hashval_t t2r_hash (const void *);
static void add_type_for_runtime (tree);
static tree lookup_type_for_runtime (tree);
-static struct eh_region *expand_eh_region_end (void);
-
-static rtx get_exception_filter (struct function *);
-
-static void collect_eh_region_array (void);
-static void resolve_fixup_regions (void);
-static void remove_fixup_regions (void);
static void remove_unreachable_regions (rtx);
-static void convert_from_eh_region_ranges_1 (rtx *, int *, int);
-static struct eh_region *duplicate_eh_region_1 (struct eh_region *,
- struct inline_remap *);
-static void duplicate_eh_region_2 (struct eh_region *, struct eh_region **);
static int ttypes_filter_eq (const void *, const void *);
static hashval_t ttypes_filter_hash (const void *);
static int ehspec_filter_eq (const void *, const void *);
static void remove_eh_handler (struct eh_region *);
static int for_each_eh_label_1 (void **, void *);
-struct reachable_info;
-
/* The return value of reachable_next_level. */
enum reachable_code
{
RNL_BLOCKED
};
-static int check_handled (tree, tree);
-static void add_reachable_handler (struct reachable_info *,
- struct eh_region *, struct eh_region *);
+struct reachable_info;
static enum reachable_code reachable_next_level (struct eh_region *, tree,
struct reachable_info *);
integer_type_node);
DECL_FIELD_CONTEXT (f_cs) = sjlj_fc_type_node;
- tmp = build_index_type (build_int_2 (4 - 1, 0));
+ tmp = build_index_type (build_int_cst (NULL_TREE, 4 - 1));
tmp = build_array_type (lang_hooks.types.type_for_mode (word_mode, 1),
tmp);
f_data = build_decl (FIELD_DECL, get_identifier ("__data"), tmp);
#ifdef DONT_USE_BUILTIN_SETJMP
#ifdef JMP_BUF_SIZE
- tmp = build_int_2 (JMP_BUF_SIZE - 1, 0);
+ tmp = build_int_cst (NULL_TREE, JMP_BUF_SIZE - 1);
#else
/* Should be large enough for most systems, if it is not,
JMP_BUF_SIZE should be defined with the proper value. It will
also tend to be larger than necessary for most systems, a more
optimal port will define JMP_BUF_SIZE. */
- tmp = build_int_2 (FIRST_PSEUDO_REGISTER + 2 - 1, 0);
+ tmp = build_int_cst (NULL_TREE, FIRST_PSEUDO_REGISTER + 2 - 1);
#endif
#else
/* builtin_setjmp takes a pointer to 5 words. */
- tmp = build_int_2 (5 * BITS_PER_WORD / POINTER_SIZE - 1, 0);
+ tmp = build_int_cst (NULL_TREE, 5 * BITS_PER_WORD / POINTER_SIZE - 1);
#endif
tmp = build_index_type (tmp);
tmp = build_array_type (ptr_type_node, tmp);
cfun->eh = 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
- expand_eh_region_end is invoked. */
+/* Routines to generate the exception tree somewhat directly.
+ These are used from tree-eh.c when processing exception related
+ nodes during tree optimization. */
-void
-expand_eh_region_start (void)
+static struct eh_region *
+gen_eh_region (enum eh_region_type type, struct eh_region *outer)
{
- struct eh_region *new_region;
- struct eh_region *cur_region;
- rtx note;
+ struct eh_region *new;
- if (! doing_eh (0))
- return;
+#ifdef ENABLE_CHECKING
+ gcc_assert (doing_eh (0));
+#endif
/* Insert a new blank region as a leaf in the tree. */
- new_region = ggc_alloc_cleared (sizeof (*new_region));
- cur_region = cfun->eh->cur_region;
- new_region->outer = cur_region;
- if (cur_region)
+ new = ggc_alloc_cleared (sizeof (*new));
+ new->type = type;
+ new->outer = outer;
+ if (outer)
{
- new_region->next_peer = cur_region->inner;
- cur_region->inner = new_region;
+ new->next_peer = outer->inner;
+ outer->inner = new;
}
else
{
- new_region->next_peer = cfun->eh->region_tree;
- cfun->eh->region_tree = new_region;
+ new->next_peer = cfun->eh->region_tree;
+ cfun->eh->region_tree = new;
}
- cfun->eh->cur_region = new_region;
-
- /* Create a note marking the start of this region. */
- new_region->region_number = ++cfun->eh->last_region_number;
- note = emit_note (NOTE_INSN_EH_REGION_BEG);
- NOTE_EH_HANDLER (note) = new_region->region_number;
-}
-
-/* Common code to end a region. Returns the region just ended. */
-static struct eh_region *
-expand_eh_region_end (void)
-{
- struct eh_region *cur_region = cfun->eh->cur_region;
- rtx note;
-
- /* Create a note marking the end of this region. */
- note = emit_note (NOTE_INSN_EH_REGION_END);
- NOTE_EH_HANDLER (note) = cur_region->region_number;
+ new->region_number = ++cfun->eh->last_region_number;
- /* Pop. */
- cfun->eh->cur_region = cur_region->outer;
-
- return cur_region;
+ return new;
}
-/* End an exception handling region for a cleanup. HANDLER is an
- expression to expand for the cleanup. */
-
-void
-expand_eh_region_end_cleanup (tree handler)
+struct eh_region *
+gen_eh_region_cleanup (struct eh_region *outer, struct eh_region *prev_try)
{
- struct eh_region *region;
- tree protect_cleanup_actions;
- rtx around_label;
- rtx data_save[2];
-
- if (! doing_eh (0))
- return;
-
- region = expand_eh_region_end ();
- region->type = ERT_CLEANUP;
- region->label = gen_label_rtx ();
- region->u.cleanup.exp = handler;
- region->u.cleanup.prev_try = cfun->eh->try_region;
-
- around_label = gen_label_rtx ();
- emit_jump (around_label);
-
- emit_label (region->label);
-
- if (flag_non_call_exceptions || region->may_contain_throw)
- {
- /* 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) ()
- : NULL_TREE);
-
- if (protect_cleanup_actions)
- expand_eh_region_start ();
-
- /* 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 (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));
-
- expand_expr (handler, const0_rtx, VOIDmode, 0);
-
- emit_move_insn (cfun->eh->exc_ptr, data_save[0]);
- emit_move_insn (cfun->eh->filter, data_save[1]);
-
- if (protect_cleanup_actions)
- expand_eh_region_end_must_not_throw (protect_cleanup_actions);
-
- /* We need any stack adjustment complete before the around_label. */
- do_pending_stack_adjust ();
- }
-
- /* We delay the generation of the _Unwind_Resume until we generate
- landing pads. We emit a marker here so as to get good control
- flow data in the meantime. */
- region->resume
- = emit_jump_insn (gen_rtx_RESX (VOIDmode, region->region_number));
- emit_barrier ();
-
- emit_label (around_label);
+ struct eh_region *cleanup = gen_eh_region (ERT_CLEANUP, outer);
+ cleanup->u.cleanup.prev_try = prev_try;
+ return cleanup;
}
-/* End an exception handling region for a try block, and prepares
- for subsequent calls to expand_start_catch. */
-
-void
-expand_start_all_catch (void)
+struct eh_region *
+gen_eh_region_try (struct eh_region *outer)
{
- struct eh_region *region;
-
- if (! doing_eh (1))
- return;
-
- region = expand_eh_region_end ();
- region->type = ERT_TRY;
- region->u.try.prev_try = cfun->eh->try_region;
- region->u.try.continue_label = gen_label_rtx ();
-
- cfun->eh->try_region = region;
-
- emit_jump (region->u.try.continue_label);
+ return gen_eh_region (ERT_TRY, outer);
}
-/* Begin a catch clause. TYPE is the type caught, a list of such
- types, (in the case of Java) an ADDR_EXPR which points to the
- runtime type to match, 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. */
-
-void
-expand_start_catch (tree type_or_list)
+struct eh_region *
+gen_eh_region_catch (struct eh_region *t, tree type_or_list)
{
- struct eh_region *t, *c, *l;
- tree type_list;
-
- if (! doing_eh (0))
- return;
+ struct eh_region *c, *l;
+ tree type_list, type_node;
+ /* Ensure to always end up with a type list to normalize further
+ processing, then register each type against the runtime types map. */
type_list = type_or_list;
-
if (type_or_list)
{
- /* Ensure to always end up with a type list to normalize further
- processing, then register each type against the runtime types
- map. */
- tree type_node;
-
if (TREE_CODE (type_or_list) != TREE_LIST)
type_list = tree_cons (NULL_TREE, type_or_list, NULL_TREE);
add_type_for_runtime (TREE_VALUE (type_node));
}
- expand_eh_region_start ();
-
- t = cfun->eh->try_region;
- c = cfun->eh->cur_region;
- c->type = ERT_CATCH;
+ c = gen_eh_region (ERT_CATCH, t->outer);
c->u.catch.type_list = type_list;
- c->label = gen_label_rtx ();
-
l = t->u.try.last_catch;
c->u.catch.prev_catch = l;
if (l)
t->u.try.catch = c;
t->u.try.last_catch = c;
- emit_label (c->label);
+ return c;
}
-/* End a catch clause. Control will resume after the try/catch block. */
-
-void
-expand_end_catch (void)
+struct eh_region *
+gen_eh_region_allowed (struct eh_region *outer, tree allowed)
{
- struct eh_region *try_region;
-
- if (! doing_eh (0))
- return;
+ struct eh_region *region = gen_eh_region (ERT_ALLOWED_EXCEPTIONS, outer);
+ region->u.allowed.type_list = allowed;
- expand_eh_region_end ();
- try_region = cfun->eh->try_region;
+ for (; allowed ; allowed = TREE_CHAIN (allowed))
+ add_type_for_runtime (TREE_VALUE (allowed));
- emit_jump (try_region->u.try.continue_label);
+ return region;
}
-/* End a sequence of catch handlers for a try block. */
-
-void
-expand_end_all_catch (void)
+struct eh_region *
+gen_eh_region_must_not_throw (struct eh_region *outer)
{
- struct eh_region *try_region;
-
- if (! doing_eh (0))
- return;
-
- try_region = cfun->eh->try_region;
- cfun->eh->try_region = try_region->u.try.prev_try;
-
- emit_label (try_region->u.try.continue_label);
+ return gen_eh_region (ERT_MUST_NOT_THROW, outer);
}
-/* End an exception region for an exception type filter. ALLOWED is a
- TREE_LIST of types to be matched by the runtime. FAILURE is an
- expression to invoke if a mismatch occurs.
-
- ??? We could use these semantics for calls to rethrow, too; if we can
- see the surrounding catch clause, we know that the exception we're
- rethrowing satisfies the "filter" of the catch type. */
-
-void
-expand_eh_region_end_allowed (tree allowed, tree failure)
+int
+get_eh_region_number (struct eh_region *region)
{
- struct eh_region *region;
- rtx around_label;
-
- if (! doing_eh (0))
- return;
-
- region = expand_eh_region_end ();
- region->type = ERT_ALLOWED_EXCEPTIONS;
- region->u.allowed.type_list = allowed;
- region->label = gen_label_rtx ();
-
- for (; allowed ; allowed = TREE_CHAIN (allowed))
- add_type_for_runtime (TREE_VALUE (allowed));
-
- /* We must emit the call to FAILURE here, so that if this function
- throws a different exception, that it will be processed by the
- correct region. */
-
- around_label = gen_label_rtx ();
- emit_jump (around_label);
-
- emit_label (region->label);
- expand_expr (failure, const0_rtx, VOIDmode, EXPAND_NORMAL);
- /* We must adjust the stack before we reach the AROUND_LABEL because
- the call to FAILURE does not occur on all paths to the
- AROUND_LABEL. */
- do_pending_stack_adjust ();
-
- emit_label (around_label);
+ return region->region_number;
}
-/* End an exception region for a must-not-throw filter. FAILURE is an
- expression invoke if an uncaught exception propagates this far.
-
- This is conceptually identical to expand_eh_region_end_allowed with
- an empty allowed list (if you passed "std::terminate" instead of
- "__cxa_call_unexpected"), but they are represented differently in
- the C++ LSDA. */
-
-void
-expand_eh_region_end_must_not_throw (tree failure)
+bool
+get_eh_region_may_contain_throw (struct eh_region *region)
{
- struct eh_region *region;
- rtx around_label;
-
- if (! doing_eh (0))
- return;
-
- region = expand_eh_region_end ();
- region->type = ERT_MUST_NOT_THROW;
- region->label = gen_label_rtx ();
-
- /* We must emit the call to FAILURE here, so that if this function
- throws a different exception, that it will be processed by the
- correct region. */
-
- around_label = gen_label_rtx ();
- emit_jump (around_label);
-
- emit_label (region->label);
- expand_expr (failure, const0_rtx, VOIDmode, EXPAND_NORMAL);
-
- emit_label (around_label);
+ return region->may_contain_throw;
}
-/* End an exception region for a throw. No handling goes on here,
- but it's the easiest way for the front-end to indicate what type
- is being thrown. */
+tree
+get_eh_region_tree_label (struct eh_region *region)
+{
+ return region->tree_label;
+}
void
-expand_eh_region_end_throw (tree type)
+set_eh_region_tree_label (struct eh_region *region, tree lab)
{
- struct eh_region *region;
-
- if (! doing_eh (0))
- return;
-
- region = expand_eh_region_end ();
- region->type = ERT_THROW;
- region->u.throw.type = type;
+ region->tree_label = lab;
}
-
-/* End a fixup region. Within this region the cleanups for the immediately
- enclosing region are _not_ run. This is used for goto cleanup to avoid
- destroying an object twice.
-
- This would be an extraordinarily simple prospect, were it not for the
- fact that we don't actually know what the immediately enclosing region
- is. This surprising fact is because expand_cleanups is currently
- generating a sequence that it will insert somewhere else. We collect
- the proper notion of "enclosing" in convert_from_eh_region_ranges. */
-
+\f
void
-expand_eh_region_end_fixup (tree handler)
+expand_resx_expr (tree exp)
{
- struct eh_region *fixup;
+ int region_nr = TREE_INT_CST_LOW (TREE_OPERAND (exp, 0));
+ struct eh_region *reg = VEC_index (eh_region,
+ cfun->eh->region_array, region_nr);
- if (! doing_eh (0))
- return;
-
- fixup = expand_eh_region_end ();
- fixup->type = ERT_FIXUP;
- fixup->u.fixup.cleanup_exp = handler;
+ gcc_assert (!reg->resume);
+ reg->resume = emit_jump_insn (gen_rtx_RESX (VOIDmode, region_nr));
+ emit_barrier ();
}
/* Note that the current EH region (if any) may contain a throw, or a
call to a function which itself may contain a throw. */
void
-note_eh_region_may_contain_throw (void)
+note_eh_region_may_contain_throw (struct eh_region *region)
{
- struct eh_region *region;
-
- region = cfun->eh->cur_region;
while (region && !region->may_contain_throw)
{
region->may_contain_throw = 1;
}
}
+void
+note_current_region_may_contain_throw (void)
+{
+ note_eh_region_may_contain_throw (cfun->eh->cur_region);
+}
+
+
/* Return an rtl expression for a pointer to the exception object
within a handler. */
/* Return an rtl expression for the exception dispatch filter
within a handler. */
-static rtx
+rtx
get_exception_filter (struct function *fun)
{
rtx filter = fun->eh->filter;
if (fun == cfun && ! filter)
{
- filter = gen_reg_rtx (word_mode);
+ filter = gen_reg_rtx (targetm.eh_return_filter_mode ());
fun->eh->filter = filter;
}
return filter;
\f
/* This section is for the exception handling specific optimization pass. */
-/* Random access the exception region tree. It's just as simple to
- collect the regions this way as in expand_eh_region_start, but
- without having to realloc memory. */
+/* Random access the exception region tree. */
-static void
+void
collect_eh_region_array (void)
{
- struct eh_region **array, *i;
+ struct eh_region *i;
i = cfun->eh->region_tree;
if (! i)
return;
- array = ggc_alloc_cleared ((cfun->eh->last_region_number + 1)
- * sizeof (*array));
- cfun->eh->region_array = array;
+ VEC_safe_grow (eh_region, gc, cfun->eh->region_array,
+ cfun->eh->last_region_number + 1);
+ VEC_replace (eh_region, cfun->eh->region_array, 0, 0);
while (1)
{
- array[i->region_number] = i;
+ VEC_replace (eh_region, cfun->eh->region_array, i->region_number, i);
/* If there are sub-regions, process them. */
if (i->inner)
}
}
-static void
-resolve_one_fixup_region (struct eh_region *fixup)
-{
- struct eh_region *cleanup, *real;
- int j, n;
-
- n = cfun->eh->last_region_number;
- cleanup = 0;
-
- for (j = 1; j <= n; ++j)
- {
- cleanup = cfun->eh->region_array[j];
- if (cleanup && cleanup->type == ERT_CLEANUP
- && cleanup->u.cleanup.exp == fixup->u.fixup.cleanup_exp)
- break;
- }
- if (j > n)
- abort ();
-
- real = cleanup->outer;
- if (real && real->type == ERT_FIXUP)
- {
- if (!real->u.fixup.resolved)
- resolve_one_fixup_region (real);
- real = real->u.fixup.real_region;
- }
-
- fixup->u.fixup.real_region = real;
- fixup->u.fixup.resolved = true;
-}
-
-static void
-resolve_fixup_regions (void)
-{
- int i, n = cfun->eh->last_region_number;
-
- for (i = 1; i <= n; ++i)
- {
- struct eh_region *fixup = cfun->eh->region_array[i];
-
- if (!fixup || fixup->type != ERT_FIXUP || fixup->u.fixup.resolved)
- continue;
-
- resolve_one_fixup_region (fixup);
- }
-}
-
-/* Now that we've discovered what region actually encloses a fixup,
- we can shuffle pointers and remove them from the tree. */
-
-static void
-remove_fixup_regions (void)
-{
- int i;
- rtx insn, note;
- struct eh_region *fixup;
-
- /* Walk the insn chain and adjust the REG_EH_REGION numbers
- for instructions referencing fixup regions. This is only
- strictly necessary for fixup regions with no parent, but
- doesn't hurt to do it for all regions. */
- for (insn = get_insns(); insn ; insn = NEXT_INSN (insn))
- if (INSN_P (insn)
- && (note = find_reg_note (insn, REG_EH_REGION, NULL))
- && INTVAL (XEXP (note, 0)) > 0
- && (fixup = cfun->eh->region_array[INTVAL (XEXP (note, 0))])
- && fixup->type == ERT_FIXUP)
- {
- if (fixup->u.fixup.real_region)
- XEXP (note, 0) = GEN_INT (fixup->u.fixup.real_region->region_number);
- else
- remove_note (insn, note);
- }
-
- /* Remove the fixup regions from the tree. */
- for (i = cfun->eh->last_region_number; i > 0; --i)
- {
- fixup = cfun->eh->region_array[i];
- if (! fixup)
- continue;
-
- /* Allow GC to maybe free some memory. */
- if (fixup->type == ERT_CLEANUP)
- fixup->u.cleanup.exp = NULL_TREE;
-
- if (fixup->type != ERT_FIXUP)
- continue;
-
- if (fixup->inner)
- {
- struct eh_region *parent, *p, **pp;
-
- parent = fixup->u.fixup.real_region;
-
- /* Fix up the children's parent pointers; find the end of
- the list. */
- for (p = fixup->inner; ; p = p->next_peer)
- {
- p->outer = parent;
- if (! p->next_peer)
- break;
- }
-
- /* In the tree of cleanups, only outer-inner ordering matters.
- So link the children back in anywhere at the correct level. */
- if (parent)
- pp = &parent->inner;
- else
- pp = &cfun->eh->region_tree;
- p->next_peer = *pp;
- *pp = fixup->inner;
- fixup->inner = NULL;
- }
-
- remove_eh_handler (fixup);
- }
-}
-
/* Remove all regions whose labels are not reachable from insns. */
static void
for (i = cfun->eh->last_region_number; i > 0; --i)
{
- r = cfun->eh->region_array[i];
+ r = VEC_index (eh_region, cfun->eh->region_array, i);
if (!r || r->region_number != i)
continue;
if (r->resume)
{
- if (uid_region_num[INSN_UID (r->resume)])
- abort ();
+ gcc_assert (!uid_region_num[INSN_UID (r->resume)]);
uid_region_num[INSN_UID (r->resume)] = i;
}
if (r->label)
{
- if (uid_region_num[INSN_UID (r->label)])
- abort ();
+ gcc_assert (!uid_region_num[INSN_UID (r->label)]);
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;
-
- if (GET_CODE (insn) == CALL_INSN
- && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER)
- for (i = 0; i < 3; i++)
- {
- rtx sub = XEXP (PATTERN (insn), i);
- for (; sub ; sub = NEXT_INSN (sub))
- reachable[uid_region_num[INSN_UID (sub)]] = true;
- }
- }
+ reachable[uid_region_num[INSN_UID (insn)]] = true;
for (i = cfun->eh->last_region_number; i > 0; --i)
{
- r = cfun->eh->region_array[i];
+ r = VEC_index (eh_region, 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. */
-
-static void
-convert_from_eh_region_ranges_1 (rtx *pinsns, int *orig_sp, int cur)
-{
- int *sp = orig_sp;
- rtx insn, next;
-
- for (insn = *pinsns; insn ; insn = next)
- {
- next = NEXT_INSN (insn);
- if (GET_CODE (insn) == NOTE)
- {
- int kind = NOTE_LINE_NUMBER (insn);
- if (kind == NOTE_INSN_EH_REGION_BEG
- || kind == NOTE_INSN_EH_REGION_END)
+ bool kill_it = true;
+ switch (r->type)
{
- if (kind == NOTE_INSN_EH_REGION_BEG)
- {
- struct eh_region *r;
-
- *sp++ = cur;
- cur = NOTE_EH_HANDLER (insn);
-
- r = cfun->eh->region_array[cur];
- if (r->type == ERT_FIXUP)
- {
- r = r->u.fixup.real_region;
- cur = r ? r->region_number : 0;
- }
- else if (r->type == ERT_CATCH)
+ case ERT_THROW:
+ /* Don't remove ERT_THROW regions if their outer region
+ is reachable. */
+ if (r->outer && reachable[r->outer->region_number])
+ kill_it = false;
+ break;
+
+ case ERT_MUST_NOT_THROW:
+ /* MUST_NOT_THROW regions are implementable solely in the
+ runtime, but their existence continues to affect calls
+ within that region. Never delete them here. */
+ kill_it = false;
+ break;
+
+ case ERT_TRY:
+ {
+ /* TRY regions are reachable if any of its CATCH regions
+ are reachable. */
+ struct eh_region *c;
+ for (c = r->u.try.catch; c ; c = c->u.catch.next_catch)
+ if (reachable[c->region_number])
{
- r = r->outer;
- cur = r ? r->region_number : 0;
+ kill_it = false;
+ break;
}
- }
- else
- cur = *--sp;
-
- /* Removing the first insn of a CALL_PLACEHOLDER sequence
- requires extra care to adjust sequence start. */
- if (insn == *pinsns)
- *pinsns = next;
- remove_insn (insn);
- continue;
- }
- }
- else if (INSN_P (insn))
- {
- if (cur > 0
- && ! find_reg_note (insn, REG_EH_REGION, NULL_RTX)
- /* Calls can always potentially throw exceptions, unless
- they have a REG_EH_REGION note with a value of 0 or less.
- Which should be the only possible kind so far. */
- && (GET_CODE (insn) == CALL_INSN
- /* If we wanted exceptions for non-call insns, then
- any may_trap_p instruction could throw. */
- || (flag_non_call_exceptions
- && GET_CODE (PATTERN (insn)) != CLOBBER
- && GET_CODE (PATTERN (insn)) != USE
- && may_trap_p (PATTERN (insn)))))
- {
- REG_NOTES (insn) = alloc_EXPR_LIST (REG_EH_REGION, GEN_INT (cur),
- REG_NOTES (insn));
- }
+ break;
+ }
- if (GET_CODE (insn) == CALL_INSN
- && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER)
- {
- convert_from_eh_region_ranges_1 (&XEXP (PATTERN (insn), 0),
- sp, cur);
- convert_from_eh_region_ranges_1 (&XEXP (PATTERN (insn), 1),
- sp, cur);
- convert_from_eh_region_ranges_1 (&XEXP (PATTERN (insn), 2),
- sp, cur);
+ default:
+ break;
}
+
+ if (kill_it)
+ remove_eh_handler (r);
}
}
- if (sp != orig_sp)
- abort ();
+ free (reachable);
+ free (uid_region_num);
}
+/* Set up EH labels for RTL. */
+
void
convert_from_eh_region_ranges (void)
{
- int *stack;
- rtx insns;
+ rtx insns = get_insns ();
+ int i, n = cfun->eh->last_region_number;
- collect_eh_region_array ();
- resolve_fixup_regions ();
+ /* Most of the work is already done at the tree level. All we need to
+ do is collect the rtl labels that correspond to the tree labels that
+ collect the rtl labels that correspond to the tree labels
+ we allocated earlier. */
+ for (i = 1; i <= n; ++i)
+ {
+ struct eh_region *region;
- stack = xmalloc (sizeof (int) * (cfun->eh->last_region_number + 1));
- insns = get_insns ();
- convert_from_eh_region_ranges_1 (&insns, stack, 0);
- free (stack);
+ region = VEC_index (eh_region, cfun->eh->region_array, i);
+ if (region && region->tree_label)
+ region->label = DECL_RTL_IF_SET (region->tree_label);
+ }
- remove_fixup_regions ();
remove_unreachable_regions (insns);
}
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 ();
+ gcc_assert (!*slot || cfun->eh->built_landing_pads);
*slot = entry;
}
for (i = cfun->eh->last_region_number; i > 0; --i)
{
- struct eh_region *region = cfun->eh->region_array[i];
+ struct eh_region *region;
rtx lab;
+ region = VEC_index (eh_region, cfun->eh->region_array, i);
if (! region || region->region_number != i)
continue;
if (cfun->eh->built_landing_pads)
add_ehl_entry (return_label, NULL);
}
+/* Returns true if the current function has exception handling regions. */
+
bool
current_function_has_exception_handlers (void)
{
for (i = cfun->eh->last_region_number; i > 0; --i)
{
- struct eh_region *region = cfun->eh->region_array[i];
+ struct eh_region *region;
- if (! region || region->region_number != i)
- continue;
- if (region->type != ERT_THROW)
+ region = VEC_index (eh_region, cfun->eh->region_array, i);
+ if (region
+ && region->region_number == i
+ && region->type != ERT_THROW)
return true;
}
return false;
}
\f
-static struct eh_region *
-duplicate_eh_region_1 (struct eh_region *o, struct inline_remap *map)
-{
- struct eh_region *n = ggc_alloc_cleared (sizeof (struct eh_region));
+/* A subroutine of duplicate_eh_regions. Search the region tree under O
+ for the minimum and maximum region numbers. Update *MIN and *MAX. */
- n->region_number = o->region_number + cfun->eh->last_region_number;
- n->type = o->type;
+static void
+duplicate_eh_regions_0 (eh_region o, int *min, int *max)
+{
+ if (o->region_number < *min)
+ *min = o->region_number;
+ if (o->region_number > *max)
+ *max = o->region_number;
- switch (n->type)
+ if (o->inner)
{
- case ERT_CLEANUP:
- case ERT_MUST_NOT_THROW:
- break;
+ o = o->inner;
+ duplicate_eh_regions_0 (o, min, max);
+ while (o->next_peer)
+ {
+ o = o->next_peer;
+ duplicate_eh_regions_0 (o, min, max);
+ }
+ }
+}
- case ERT_TRY:
- if (o->u.try.continue_label)
- n->u.try.continue_label
- = get_label_from_map (map,
- CODE_LABEL_NUMBER (o->u.try.continue_label));
- break;
+/* A subroutine of duplicate_eh_regions. Copy the region tree under OLD.
+ Root it at OUTER, and apply EH_OFFSET to the region number. Don't worry
+ about the other internal pointers just yet, just the tree-like pointers. */
- case ERT_CATCH:
- n->u.catch.type_list = o->u.catch.type_list;
- break;
+static eh_region
+duplicate_eh_regions_1 (eh_region old, eh_region outer, int eh_offset)
+{
+ eh_region ret, n;
- case ERT_ALLOWED_EXCEPTIONS:
- n->u.allowed.type_list = o->u.allowed.type_list;
- break;
+ ret = n = ggc_alloc (sizeof (struct eh_region));
- case ERT_THROW:
- n->u.throw.type = o->u.throw.type;
+ *n = *old;
+ n->outer = outer;
+ n->next_peer = NULL;
+ gcc_assert (!old->aka);
- default:
- abort ();
- }
+ n->region_number += eh_offset;
+ VEC_replace (eh_region, cfun->eh->region_array, n->region_number, n);
- if (o->label)
- n->label = get_label_from_map (map, CODE_LABEL_NUMBER (o->label));
- if (o->resume)
+ if (old->inner)
{
- n->resume = map->insn_map[INSN_UID (o->resume)];
- if (n->resume == NULL)
- abort ();
+ old = old->inner;
+ n = n->inner = duplicate_eh_regions_1 (old, ret, eh_offset);
+ while (old->next_peer)
+ {
+ old = old->next_peer;
+ n = n->next_peer = duplicate_eh_regions_1 (old, ret, eh_offset);
+ }
}
- return n;
+ return ret;
}
-static void
-duplicate_eh_region_2 (struct eh_region *o, struct eh_region **n_array)
+/* Duplicate the EH regions of IFUN, rooted at COPY_REGION, into current
+ function and root the tree below OUTER_REGION. Remap labels using MAP
+ callback. The special case of COPY_REGION of 0 means all regions. */
+
+int
+duplicate_eh_regions (struct function *ifun, duplicate_eh_regions_map map,
+ void *data, int copy_region, int outer_region)
{
- struct eh_region *n = n_array[o->region_number];
+ eh_region cur, prev_try, outer, *splice;
+ int i, min_region, max_region, eh_offset, cfun_last_region_number;
+ int num_regions;
- switch (n->type)
- {
- case ERT_TRY:
- n->u.try.catch = n_array[o->u.try.catch->region_number];
- n->u.try.last_catch = n_array[o->u.try.last_catch->region_number];
- break;
+ if (!ifun->eh->region_tree)
+ return 0;
- case ERT_CATCH:
- if (o->u.catch.next_catch)
- 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];
- break;
+ /* Find the range of region numbers to be copied. The interface we
+ provide here mandates a single offset to find new number from old,
+ which means we must look at the numbers present, instead of the
+ count or something else. */
+ if (copy_region > 0)
+ {
+ min_region = INT_MAX;
+ max_region = 0;
- default:
- break;
+ cur = VEC_index (eh_region, ifun->eh->region_array, copy_region);
+ duplicate_eh_regions_0 (cur, &min_region, &max_region);
}
+ else
+ min_region = 1, max_region = ifun->eh->last_region_number;
+ num_regions = max_region - min_region + 1;
+ cfun_last_region_number = cfun->eh->last_region_number;
+ eh_offset = cfun_last_region_number + 1 - min_region;
- if (o->outer)
- n->outer = n_array[o->outer->region_number];
- if (o->inner)
- 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 (struct function *ifun, struct inline_remap *map)
-{
- int ifun_last_region_number = ifun->eh->last_region_number;
- struct eh_region **n_array, *root, *cur;
- int i;
+ /* If we've not yet created a region array, do so now. */
+ VEC_safe_grow (eh_region, gc, cfun->eh->region_array,
+ cfun_last_region_number + 1 + num_regions);
+ cfun->eh->last_region_number = max_region + eh_offset;
- if (ifun_last_region_number == 0)
- return 0;
+ /* We may have just allocated the array for the first time.
+ Make sure that element zero is null. */
+ VEC_replace (eh_region, cfun->eh->region_array, 0, 0);
- n_array = xcalloc (ifun_last_region_number + 1, sizeof (*n_array));
+ /* Zero all entries in the range allocated. */
+ memset (VEC_address (eh_region, cfun->eh->region_array)
+ + cfun_last_region_number + 1, 0, num_regions * sizeof (eh_region));
- for (i = 1; i <= ifun_last_region_number; ++i)
+ /* Locate the spot at which to insert the new tree. */
+ if (outer_region > 0)
{
- cur = ifun->eh->region_array[i];
- if (!cur || cur->region_number != i)
- continue;
- n_array[i] = duplicate_eh_region_1 (cur, map);
+ outer = VEC_index (eh_region, cfun->eh->region_array, outer_region);
+ splice = &outer->inner;
}
- for (i = 1; i <= ifun_last_region_number; ++i)
+ else
{
- cur = ifun->eh->region_array[i];
- if (!cur || cur->region_number != i)
- continue;
- duplicate_eh_region_2 (cur, n_array);
+ outer = NULL;
+ splice = &cfun->eh->region_tree;
}
+ while (*splice)
+ splice = &(*splice)->next_peer;
- root = n_array[ifun->eh->region_tree->region_number];
- cur = cfun->eh->cur_region;
- if (cur)
+ /* Copy all the regions in the subtree. */
+ if (copy_region > 0)
+ {
+ cur = VEC_index (eh_region, ifun->eh->region_array, copy_region);
+ *splice = duplicate_eh_regions_1 (cur, outer, eh_offset);
+ }
+ else
{
- struct eh_region *p = cur->inner;
- if (p)
+ eh_region n;
+
+ cur = ifun->eh->region_tree;
+ *splice = n = duplicate_eh_regions_1 (cur, outer, eh_offset);
+ while (cur->next_peer)
{
- while (p->next_peer)
- p = p->next_peer;
- p->next_peer = root;
+ cur = cur->next_peer;
+ n = n->next_peer = duplicate_eh_regions_1 (cur, outer, eh_offset);
}
- else
- cur->inner = root;
-
- for (i = 1; i <= ifun_last_region_number; ++i)
- if (n_array[i] && n_array[i]->outer == NULL)
- n_array[i]->outer = cur;
}
- else
+
+ /* Remap all the labels in the new regions. */
+ for (i = cfun_last_region_number + 1;
+ VEC_iterate (eh_region, cfun->eh->region_array, i, cur); ++i)
+ if (cur && cur->tree_label)
+ cur->tree_label = map (cur->tree_label, data);
+
+ /* Search for the containing ERT_TRY region to fix up
+ the prev_try short-cuts for ERT_CLEANUP regions. */
+ prev_try = NULL;
+ if (outer_region > 0)
+ for (prev_try = VEC_index (eh_region, cfun->eh->region_array, outer_region);
+ prev_try && prev_try->type != ERT_TRY;
+ prev_try = prev_try->outer)
+ if (prev_try->type == ERT_MUST_NOT_THROW
+ || (prev_try->type == ERT_ALLOWED_EXCEPTIONS
+ && !prev_try->u.allowed.type_list))
+ {
+ prev_try = NULL;
+ break;
+ }
+
+ /* Remap all of the internal catch and cleanup linkages. Since we
+ duplicate entire subtrees, all of the referenced regions will have
+ been copied too. And since we renumbered them as a block, a simple
+ bit of arithmetic finds us the index for the replacement region. */
+ for (i = cfun_last_region_number + 1;
+ VEC_iterate (eh_region, cfun->eh->region_array, i, cur); ++i)
{
- struct eh_region *p = cfun->eh->region_tree;
- if (p)
+ if (cur == NULL)
+ continue;
+
+#define REMAP(REG) \
+ (REG) = VEC_index (eh_region, cfun->eh->region_array, \
+ (REG)->region_number + eh_offset)
+
+ switch (cur->type)
{
- while (p->next_peer)
- p = p->next_peer;
- p->next_peer = root;
+ case ERT_TRY:
+ if (cur->u.try.catch)
+ REMAP (cur->u.try.catch);
+ if (cur->u.try.last_catch)
+ REMAP (cur->u.try.last_catch);
+ break;
+
+ case ERT_CATCH:
+ if (cur->u.catch.next_catch)
+ REMAP (cur->u.catch.next_catch);
+ if (cur->u.catch.prev_catch)
+ REMAP (cur->u.catch.prev_catch);
+ break;
+
+ case ERT_CLEANUP:
+ if (cur->u.cleanup.prev_try)
+ REMAP (cur->u.cleanup.prev_try);
+ else
+ cur->u.cleanup.prev_try = prev_try;
+ break;
+
+ default:
+ break;
}
- else
- cfun->eh->region_tree = root;
+
+#undef REMAP
}
- free (n_array);
+ return eh_offset;
+}
+
+/* Return true if REGION_A is outer to REGION_B in IFUN. */
+
+bool
+eh_region_outer_p (struct function *ifun, int region_a, int region_b)
+{
+ struct eh_region *rp_a, *rp_b;
+
+ gcc_assert (ifun->eh->last_region_number > 0);
+ gcc_assert (ifun->eh->region_tree);
+
+ rp_a = VEC_index (eh_region, ifun->eh->region_array, region_a);
+ rp_b = VEC_index (eh_region, ifun->eh->region_array, region_b);
+ gcc_assert (rp_a != NULL);
+ gcc_assert (rp_b != NULL);
+
+ do
+ {
+ if (rp_a == rp_b)
+ return true;
+ rp_b = rp_b->outer;
+ }
+ while (rp_b);
- i = cfun->eh->last_region_number;
- cfun->eh->last_region_number = i + ifun_last_region_number;
- return i;
+ return false;
}
+/* Return region number of region that is outer to both if REGION_A and
+ REGION_B in IFUN. */
+
+int
+eh_region_outermost (struct function *ifun, int region_a, int region_b)
+{
+ struct eh_region *rp_a, *rp_b;
+ sbitmap b_outer;
+
+ gcc_assert (ifun->eh->last_region_number > 0);
+ gcc_assert (ifun->eh->region_tree);
+
+ rp_a = VEC_index (eh_region, ifun->eh->region_array, region_a);
+ rp_b = VEC_index (eh_region, ifun->eh->region_array, region_b);
+ gcc_assert (rp_a != NULL);
+ gcc_assert (rp_b != NULL);
+
+ b_outer = sbitmap_alloc (ifun->eh->last_region_number + 1);
+ sbitmap_zero (b_outer);
+
+ do
+ {
+ SET_BIT (b_outer, rp_b->region_number);
+ rp_b = rp_b->outer;
+ }
+ while (rp_b);
+
+ do
+ {
+ if (TEST_BIT (b_outer, rp_a->region_number))
+ {
+ sbitmap_free (b_outer);
+ return rp_a->region_number;
+ }
+ rp_a = rp_a->outer;
+ }
+ while (rp_a);
+
+ sbitmap_free (b_outer);
+ return -1;
+}
\f
static int
t2r_eq (const void *pentry, const void *pdata)
{
- tree entry = (tree) pentry;
- tree data = (tree) pdata;
+ const_tree const entry = (const_tree) pentry;
+ const_tree const data = (const_tree) pdata;
return TREE_PURPOSE (entry) == data;
}
static hashval_t
t2r_hash (const void *pentry)
{
- tree entry = (tree) pentry;
+ const_tree const entry = (const_tree) pentry;
return TREE_HASH (TREE_PURPOSE (entry));
}
static int
ttypes_filter_eq (const void *pentry, const void *pdata)
{
- const struct ttypes_filter *entry = (const struct ttypes_filter *) pentry;
- tree data = (tree) pdata;
+ const struct ttypes_filter *const entry
+ = (const struct ttypes_filter *) pentry;
+ const_tree const data = (const_tree) pdata;
return entry->t == data;
}
{
/* Filter value is a 1 based table index. */
- n = xmalloc (sizeof (*n));
+ n = XNEW (struct ttypes_filter);
n->t = type;
- n->filter = VARRAY_ACTIVE_SIZE (cfun->eh->ttype_data) + 1;
+ n->filter = VEC_length (tree, cfun->eh->ttype_data) + 1;
*slot = n;
- VARRAY_PUSH_TREE (cfun->eh->ttype_data, type);
+ VEC_safe_push (tree, gc, cfun->eh->ttype_data, type);
}
return n->filter;
{
/* Filter value is a -1 based byte index into a uleb128 buffer. */
- n = xmalloc (sizeof (*n));
+ n = XNEW (struct ttypes_filter);
n->t = list;
n->filter = -(VARRAY_ACTIVE_SIZE (cfun->eh->ehspec_data) + 1);
*slot = n;
- /* Look up each type in the list and encode its filter
- value as a uleb128. Terminate the list with 0. */
+ /* Generate a 0 terminated list of filter values. */
for (; list ; list = TREE_CHAIN (list))
- push_uleb128 (&cfun->eh->ehspec_data,
- add_ttypes_entry (ttypes_hash, TREE_VALUE (list)));
- VARRAY_PUSH_UCHAR (cfun->eh->ehspec_data, 0);
+ {
+ if (targetm.arm_eabi_unwinder)
+ VARRAY_PUSH_TREE (cfun->eh->ehspec_data, TREE_VALUE (list));
+ else
+ {
+ /* Look up each type in the list and encode its filter
+ value as a uleb128. */
+ push_uleb128 (&cfun->eh->ehspec_data,
+ add_ttypes_entry (ttypes_hash, TREE_VALUE (list)));
+ }
+ }
+ if (targetm.arm_eabi_unwinder)
+ VARRAY_PUSH_TREE (cfun->eh->ehspec_data, NULL_TREE);
+ else
+ VARRAY_PUSH_UCHAR (cfun->eh->ehspec_data, 0);
}
return n->filter;
int i;
htab_t ttypes, ehspec;
- VARRAY_TREE_INIT (cfun->eh->ttype_data, 16, "ttype_data");
- VARRAY_UCHAR_INIT (cfun->eh->ehspec_data, 64, "ehspec_data");
+ cfun->eh->ttype_data = VEC_alloc (tree, gc, 16);
+ if (targetm.arm_eabi_unwinder)
+ VARRAY_TREE_INIT (cfun->eh->ehspec_data, 64, "ehspec_data");
+ else
+ VARRAY_UCHAR_INIT (cfun->eh->ehspec_data, 64, "ehspec_data");
ttypes = htab_create (31, ttypes_filter_hash, ttypes_filter_eq, free);
ehspec = htab_create (31, ehspec_filter_hash, ehspec_filter_eq, free);
for (i = cfun->eh->last_region_number; i > 0; --i)
{
- struct eh_region *r = cfun->eh->region_array[i];
+ struct eh_region *r;
+
+ r = VEC_index (eh_region, cfun->eh->region_array, i);
/* Mind we don't process a region more than once. */
if (!r || r->region_number != i)
for (;tp_node; tp_node = TREE_CHAIN (tp_node))
{
int flt = add_ttypes_entry (ttypes, TREE_VALUE (tp_node));
- tree flt_node = build_int_2 (flt, 0);
+ tree flt_node = build_int_cst (NULL_TREE, flt);
r->u.catch.filter_list
= tree_cons (NULL_TREE, flt_node, r->u.catch.filter_list);
/* Get a filter value for the NULL list also since it will need
an action record anyway. */
int flt = add_ttypes_entry (ttypes, NULL);
- tree flt_node = build_int_2 (flt, 0);
+ tree flt_node = build_int_cst (NULL_TREE, flt);
r->u.catch.filter_list
= tree_cons (NULL_TREE, flt_node, r->u.catch.filter_list);
rtx last;
basic_block bb;
edge e;
+ edge_iterator ei;
- /* If there happens to be an fallthru edge (possibly created by cleanup_cfg
- call), we don't want it to go into newly created landing pad or other EH
+ /* If there happens to be a fallthru edge (possibly created by cleanup_cfg
+ call), we don't want it to go into newly created landing pad or other EH
construct. */
- for (e = BLOCK_FOR_INSN (insn)->pred; e; e = e->pred_next)
+ for (ei = ei_start (BLOCK_FOR_INSN (insn)->preds); (e = ei_safe_edge (ei)); )
if (e->flags & EDGE_FALLTHRU)
force_nonfallthru (e);
+ else
+ ei_next (&ei);
last = emit_insn_before (seq, insn);
- if (GET_CODE (last) == BARRIER)
+ if (BARRIER_P (last))
last = PREV_INSN (last);
bb = create_basic_block (seq, last, BLOCK_FOR_INSN (insn)->prev_bb);
update_bb_for_insn (bb);
for (i = cfun->eh->last_region_number; i > 0; --i)
{
- struct eh_region *region = cfun->eh->region_array[i];
+ struct eh_region *region;
rtx seq;
+ region = VEC_index (eh_region, cfun->eh->region_array, i);
/* Mind we don't process a region more than once. */
if (!region || region->region_number != i)
continue;
emit_cmp_and_jump_insns
(cfun->eh->filter,
GEN_INT (tree_low_cst (TREE_VALUE (flt_node), 0)),
- EQ, NULL_RTX, word_mode, 0, c->label);
+ EQ, NULL_RTX,
+ targetm.eh_return_filter_mode (), 0, c->label);
tp_node = TREE_CHAIN (tp_node);
flt_node = TREE_CHAIN (flt_node);
emit_cmp_and_jump_insns (cfun->eh->filter,
GEN_INT (region->u.allowed.filter),
- EQ, NULL_RTX, word_mode, 0, region->label);
+ EQ, NULL_RTX,
+ targetm.eh_return_filter_mode (), 0, region->label);
/* We delay the generation of the _Unwind_Resume until we generate
landing pads. We emit a marker here so as to get good control
break;
default:
- abort ();
+ gcc_unreachable ();
}
}
}
for (i = cfun->eh->last_region_number; i > 0; --i)
{
- struct eh_region *region = cfun->eh->region_array[i];
+ struct eh_region *region;
struct eh_region *outer;
rtx seq;
rtx barrier;
+ region = VEC_index (eh_region, cfun->eh->region_array, i);
/* Mind we don't process a region more than once. */
if (!region || region->region_number != i)
continue;
emit_jump (outer->post_landing_pad);
src = BLOCK_FOR_INSN (region->resume);
dest = BLOCK_FOR_INSN (outer->post_landing_pad);
- while (src->succ)
- remove_edge (src->succ);
+ while (EDGE_COUNT (src->succs) > 0)
+ remove_edge (EDGE_SUCC (src, 0));
e = make_edge (src, dest, 0);
e->probability = REG_BR_PROB_BASE;
e->count = src->count;
}
else
- emit_library_call (unwind_resume_libfunc, LCT_THROW,
- VOIDmode, 1, cfun->eh->exc_ptr, ptr_mode);
+ {
+ emit_library_call (unwind_resume_libfunc, LCT_THROW,
+ VOIDmode, 1, cfun->eh->exc_ptr, ptr_mode);
+
+ /* What we just emitted was a throwing libcall, so it got a
+ barrier automatically added after it. If the last insn in
+ the libcall sequence isn't the barrier, it's because the
+ target emits multiple insns for a call, and there are insns
+ after the actual call insn (which are redundant and would be
+ optimized away). The barrier is inserted exactly after the
+ call insn, so let's go get that and delete the insns after
+ it, because below we need the barrier to be the last insn in
+ the sequence. */
+ delete_insns_since (NEXT_INSN (last_call_insn ()));
+ }
seq = get_insns ();
end_sequence ();
barrier = emit_insn_before (seq, region->resume);
/* Avoid duplicate barrier. */
- if (GET_CODE (barrier) != BARRIER)
- abort ();
+ gcc_assert (BARRIER_P (barrier));
delete_insn (barrier);
delete_insn (region->resume);
+
+ /* ??? From tree-ssa we can wind up with catch regions whose
+ label is not instantiated, but whose resx is present. Now
+ that we've dealt with the resx, kill the region. */
+ if (region->label == NULL && region->type == ERT_CLEANUP)
+ remove_eh_handler (region);
}
}
dw2_build_landing_pads (void)
{
int i;
- unsigned int j;
for (i = cfun->eh->last_region_number; i > 0; --i)
{
- struct eh_region *region = cfun->eh->region_array[i];
+ struct eh_region *region;
rtx seq;
basic_block bb;
- bool clobbers_hard_regs = false;
edge e;
+ region = VEC_index (eh_region, cfun->eh->region_array, i);
/* Mind we don't process a region more than once. */
if (!region || region->region_number != i)
continue;
#endif
{ /* Nothing */ }
- /* If the eh_return data registers are call-saved, then we
- won't have considered them clobbered from the call that
- threw. Kill them now. */
- for (j = 0; ; ++j)
- {
- unsigned r = EH_RETURN_DATA_REGNO (j);
- if (r == INVALID_REGNUM)
- break;
- if (! call_used_regs[r])
- {
- emit_insn (gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (Pmode, r)));
- clobbers_hard_regs = true;
- }
- }
-
- if (clobbers_hard_regs)
- {
- /* @@@ This is a kludge. Not all machine descriptions define a
- blockage insn, but we must not allow the code we just generated
- to be reordered by scheduling. So emit an ASM_INPUT to act as
- blockage insn. */
- emit_insn (gen_rtx_ASM_INPUT (VOIDmode, ""));
- }
-
emit_move_insn (cfun->eh->exc_ptr,
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)));
+ gen_rtx_REG (targetm.eh_return_filter_mode (),
+ EH_RETURN_DATA_REGNO (1)));
seq = get_insns ();
end_sequence ();
if (!note || INTVAL (XEXP (note, 0)) <= 0)
continue;
- region = cfun->eh->region_array[INTVAL (XEXP (note, 0))];
+ region = VEC_index (eh_region, cfun->eh->region_array, INTVAL (XEXP (note, 0)));
type_thrown = NULL_TREE;
if (region->type == ERT_THROW)
rc = RNL_NOT_CAUGHT;
for (; region; region = region->outer)
{
- rc = reachable_next_level (region, type_thrown, 0);
+ rc = reachable_next_level (region, type_thrown, NULL);
if (rc != RNL_NOT_CAUGHT)
break;
}
for (i = cfun->eh->last_region_number; i > 0; --i)
if (lp_info[i].directly_reachable)
{
- struct eh_region *r = cfun->eh->region_array[i];
+ struct eh_region *r = VEC_index (eh_region, cfun->eh->region_array, i);
+
r->landing_pad = dispatch_label;
lp_info[i].action_index = collect_one_action_chain (ar_hash, r);
if (lp_info[i].action_index != -1)
rtx note, before, p;
/* Reset value tracking at extended basic block boundaries. */
- if (GET_CODE (insn) == CODE_LABEL)
+ if (LABEL_P (insn))
last_call_site = -2;
if (! INSN_P (insn))
/* Calls (and trapping insns) without notes are outside any
exception handling region in this function. Mark them as
no action. */
- if (GET_CODE (insn) == CALL_INSN
+ if (CALL_P (insn)
|| (flag_non_call_exceptions
&& may_trap_p (PATTERN (insn))))
this_call_site = -1;
if (INTVAL (XEXP (note, 0)) <= 0)
continue;
- region = cfun->eh->region_array[INTVAL (XEXP (note, 0))];
+ region = VEC_index (eh_region, cfun->eh->region_array, INTVAL (XEXP (note, 0)));
this_call_site = lp_info[region->region_number].call_site_index;
}
/* Don't separate a call from it's argument loads. */
before = insn;
- if (GET_CODE (insn) == CALL_INSN)
+ if (CALL_P (insn))
before = find_first_parameter_load (insn, NULL_RTX);
start_sequence ();
sjlj_emit_function_enter (rtx dispatch_label)
{
rtx fn_begin, fc, mem, seq;
+ bool fn_begin_outside_block;
fc = cfun->eh->sjlj_fc;
#ifdef DONT_USE_BUILTIN_SETJMP
{
- rtx x, note;
+ rtx x;
x = emit_library_call_value (setjmp_libfunc, NULL_RTX, LCT_RETURNS_TWICE,
TYPE_MODE (integer_type_node), 1,
plus_constant (XEXP (fc, 0),
sjlj_fc_jbuf_ofs), Pmode);
- note = emit_note (NOTE_INSN_EXPECTED_VALUE);
- NOTE_EXPECTED_VALUE (note) = gen_rtx_EQ (VOIDmode, x, const0_rtx);
-
emit_cmp_and_jump_insns (x, const0_rtx, NE, 0,
TYPE_MODE (integer_type_node), 0, dispatch_label);
+ add_reg_br_prob_note (get_insns (), REG_BR_PROB_BASE/100);
}
#else
expand_builtin_setjmp_setup (plus_constant (XEXP (fc, 0), sjlj_fc_jbuf_ofs),
do this in a block that is at loop level 0 and dominates all
can_throw_internal instructions. */
+ fn_begin_outside_block = true;
for (fn_begin = get_insns (); ; fn_begin = NEXT_INSN (fn_begin))
- if (GET_CODE (fn_begin) == NOTE
- && (NOTE_LINE_NUMBER (fn_begin) == NOTE_INSN_FUNCTION_BEG
- || NOTE_LINE_NUMBER (fn_begin) == NOTE_INSN_BASIC_BLOCK))
- break;
- if (NOTE_LINE_NUMBER (fn_begin) == NOTE_INSN_FUNCTION_BEG)
- insert_insn_on_edge (seq, ENTRY_BLOCK_PTR->succ);
- else
- {
- rtx last = BB_END (ENTRY_BLOCK_PTR->succ->dest);
- for (; ; fn_begin = NEXT_INSN (fn_begin))
- if ((GET_CODE (fn_begin) == NOTE
- && NOTE_LINE_NUMBER (fn_begin) == NOTE_INSN_FUNCTION_BEG)
- || fn_begin == last)
+ if (NOTE_P (fn_begin))
+ {
+ if (NOTE_KIND (fn_begin) == NOTE_INSN_FUNCTION_BEG)
break;
- emit_insn_after (seq, fn_begin);
- }
+ else if (NOTE_INSN_BASIC_BLOCK_P (fn_begin))
+ fn_begin_outside_block = false;
+ }
+
+ if (fn_begin_outside_block)
+ insert_insn_on_edge (seq, single_succ_edge (ENTRY_BLOCK_PTR));
+ else
+ emit_insn_after (seq, fn_begin);
}
/* Call back from expand_function_end to know where we should put
{
rtx seq;
edge e;
+ edge_iterator ei;
start_sequence ();
post-dominates all can_throw_internal instructions. This is
the last possible moment. */
- for (e = EXIT_BLOCK_PTR->pred; e; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR->preds)
if (e->flags & EDGE_FALLTHRU)
break;
if (e)
/* Figure out whether the place we are supposed to insert libcall
is inside the last basic block or after it. In the other case
we need to emit to edge. */
- if (e->src->next_bb != EXIT_BLOCK_PTR)
- abort ();
- for (insn = NEXT_INSN (BB_END (e->src)); insn; insn = NEXT_INSN (insn))
- if (insn == cfun->eh->sjlj_exit_after)
- break;
- if (insn)
- insert_insn_on_edge (seq, e);
- else
+ gcc_assert (e->src->next_bb == EXIT_BLOCK_PTR);
+ for (insn = BB_HEAD (e->src); ; insn = NEXT_INSN (insn))
{
- insn = cfun->eh->sjlj_exit_after;
- if (GET_CODE (insn) == CODE_LABEL)
- insn = NEXT_INSN (insn);
- emit_insn_after (seq, insn);
+ if (insn == cfun->eh->sjlj_exit_after)
+ {
+ if (LABEL_P (insn))
+ insn = NEXT_INSN (insn);
+ emit_insn_after (seq, insn);
+ return;
+ }
+ if (insn == BB_END (e->src))
+ break;
}
+ insert_insn_on_edge (seq, e);
}
}
emit_cmp_and_jump_insns (dispatch, GEN_INT (lp_info[i].dispatch_index),
EQ, NULL_RTX, TYPE_MODE (integer_type_node), 0,
- cfun->eh->region_array[i]->post_landing_pad);
+ ((struct eh_region *)VEC_index (eh_region, cfun->eh->region_array, i))
+ ->post_landing_pad);
}
seq = get_insns ();
end_sequence ();
- before = cfun->eh->region_array[first_reachable]->post_landing_pad;
+ before = (((struct eh_region *)VEC_index (eh_region, cfun->eh->region_array, first_reachable))
+ ->post_landing_pad);
bb = emit_to_new_bb_before (seq, before);
e = make_edge (bb, bb->next_bb, EDGE_FALLTHRU);
{
struct sjlj_lp_info *lp_info;
- lp_info = xcalloc (cfun->eh->last_region_number + 1,
- sizeof (struct sjlj_lp_info));
+ lp_info = XCNEWVEC (struct sjlj_lp_info, cfun->eh->last_region_number + 1);
if (sjlj_find_directly_reachable_regions (lp_info))
{
connect many of the handlers, and then type information will not
be effective. Still, this is a win over previous implementations. */
- cleanup_cfg (CLEANUP_PRE_LOOP | CLEANUP_NO_INSN_DEL);
-
/* These registers are used by the landing pads. Make sure they
have been generated. */
get_exception_pointer (cfun);
/* We've totally changed the CFG. Start over. */
find_exception_handler_labels ();
break_superblocks ();
- if (USING_SJLJ_EXCEPTIONS)
+ if (USING_SJLJ_EXCEPTIONS
+ /* Kludge for Alpha/Tru64 (see alpha_gp_save_rtx). */
+ || single_succ_edge (ENTRY_BLOCK_PTR)->insns.r)
commit_edge_insertions ();
FOR_EACH_BB (bb)
{
- edge e, next;
+ edge e;
+ edge_iterator ei;
bool eh = false;
- for (e = bb->succ; e; e = next)
+ for (ei = ei_start (bb->succs); (e = ei_safe_edge (ei)); )
{
- next = e->succ_next;
if (e->flags & EDGE_EH)
{
remove_edge (e);
eh = true;
}
+ else
+ ei_next (&ei);
}
if (eh)
- make_eh_edge (NULL, bb, BB_END (bb));
+ rtl_make_eh_edge (NULL, bb, BB_END (bb));
}
- cleanup_cfg (CLEANUP_PRE_LOOP | CLEANUP_NO_INSN_DEL);
}
\f
static hashval_t
ehl_hash (const void *pentry)
{
- struct ehl_map_entry *entry = (struct ehl_map_entry *) pentry;
+ const struct ehl_map_entry *const entry
+ = (const struct ehl_map_entry *) pentry;
/* 2^32 * ((sqrt(5) - 1) / 2) */
const hashval_t scaled_golden_ratio = 0x9e3779b9;
static int
ehl_eq (const void *pentry, const void *pdata)
{
- struct ehl_map_entry *entry = (struct ehl_map_entry *) pentry;
- struct ehl_map_entry *data = (struct ehl_map_entry *) pdata;
+ const struct ehl_map_entry *const entry
+ = (const struct ehl_map_entry *) pentry;
+ const struct ehl_map_entry *const data
+ = (const struct ehl_map_entry *) pdata;
return entry->label == data->label;
}
tmp.label = label;
slot = (struct ehl_map_entry **)
htab_find_slot (cfun->eh->exception_handler_label_map, &tmp, NO_INSERT);
- if (! slot)
- abort ();
+ gcc_assert (slot);
htab_clear_slot (cfun->eh->exception_handler_label_map, (void **) slot);
}
list of alternate numbers by which we are known. */
outer = region->outer;
- cfun->eh->region_array[region->region_number] = outer;
+ VEC_replace (eh_region, 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; });
+ unsigned i;
+ bitmap_iterator bi;
+
+ EXECUTE_IF_SET_IN_BITMAP (region->aka, 0, i, bi)
+ {
+ VEC_replace (eh_region, 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_ior_into (outer->aka, region->aka);
bitmap_set_bit (outer->aka, region->region_number);
}
try->type == ERT_CATCH;
try = try->next_peer)
continue;
- if (try->type != ERT_TRY)
- abort ();
+ gcc_assert (try->type == ERT_TRY);
next = region->u.catch.next_catch;
prev = region->u.catch.prev_catch;
(*callback) (entry->label);
return 1;
}
+
+/* Invoke CALLBACK for every exception region in the current function. */
+
+void
+for_each_eh_region (void (*callback) (struct eh_region *))
+{
+ int i, n = cfun->eh->last_region_number;
+ for (i = 1; i <= n; ++i)
+ {
+ struct eh_region *region;
+
+ region = VEC_index (eh_region, cfun->eh->region_array, i);
+ if (region)
+ (*callback) (region);
+ }
+}
\f
/* This section describes CFG exception edges for flow. */
/* For communicating between calls to reachable_next_level. */
-struct reachable_info GTY(())
+struct reachable_info
{
tree types_caught;
tree types_allowed;
- rtx handlers;
+ void (*callback) (struct eh_region *, void *);
+ void *callback_data;
+ bool saw_any_handlers;
};
/* A subroutine of reachable_next_level. Return true if TYPE, or a
LP_REGION contains the landing pad; REGION is the handler. */
static void
-add_reachable_handler (struct reachable_info *info, struct eh_region *lp_region, struct eh_region *region)
+add_reachable_handler (struct reachable_info *info,
+ struct eh_region *lp_region, struct eh_region *region)
{
if (! info)
return;
+ info->saw_any_handlers = true;
+
if (cfun->eh->built_landing_pads)
- {
- if (! info->handlers)
- info->handlers = alloc_INSN_LIST (lp_region->landing_pad, NULL_RTX);
- }
+ info->callback (lp_region, info->callback_data);
else
- info->handlers = alloc_INSN_LIST (region->label, info->handlers);
+ info->callback (region, info->callback_data);
}
/* Process one level of exception regions for reachability.
/* Here we end our search, since no exceptions may propagate.
If we've touched down at some landing pad previous, then the
explicit function call we generated may be used. Otherwise
- the call is made by the runtime. */
- if (info && info->handlers)
+ the call is made by the runtime.
+
+ Before inlining, do not perform this optimization. We may
+ inline a subroutine that contains handlers, and that will
+ change the value of saw_any_handlers. */
+
+ if ((info && info->saw_any_handlers) || !cfun->after_inlining)
{
add_reachable_handler (info, region, region);
return RNL_CAUGHT;
return RNL_BLOCKED;
case ERT_THROW:
- case ERT_FIXUP:
case ERT_UNKNOWN:
/* Shouldn't see these here. */
+ gcc_unreachable ();
break;
+ default:
+ gcc_unreachable ();
}
-
- abort ();
}
-/* Retrieve a list of labels of exception handlers which can be
- reached by a given insn. */
+/* Invoke CALLBACK on each region reachable from REGION_NUMBER. */
-rtx
-reachable_handlers (rtx insn)
+void
+foreach_reachable_handler (int region_number, bool is_resx,
+ void (*callback) (struct eh_region *, void *),
+ void *callback_data)
{
struct reachable_info info;
struct eh_region *region;
tree type_thrown;
- int region_number;
-
- if (GET_CODE (insn) == JUMP_INSN
- && GET_CODE (PATTERN (insn)) == RESX)
- region_number = XINT (PATTERN (insn), 0);
- else
- {
- rtx note = find_reg_note (insn, REG_EH_REGION, NULL_RTX);
- if (!note || INTVAL (XEXP (note, 0)) <= 0)
- return NULL;
- region_number = INTVAL (XEXP (note, 0));
- }
memset (&info, 0, sizeof (info));
+ info.callback = callback;
+ info.callback_data = callback_data;
- region = cfun->eh->region_array[region_number];
+ region = VEC_index (eh_region, cfun->eh->region_array, region_number);
type_thrown = NULL_TREE;
- if (GET_CODE (insn) == JUMP_INSN
- && GET_CODE (PATTERN (insn)) == RESX)
+ if (is_resx)
{
/* A RESX leaves a region instead of entering it. Thus the
region itself may have been deleted out from under us. */
if (region == NULL)
- return NULL;
+ return;
region = region->outer;
}
else if (region->type == ERT_THROW)
else
region = region->outer;
}
+}
+
+/* Retrieve a list of labels of exception handlers which can be
+ reached by a given insn. */
+
+static void
+arh_to_landing_pad (struct eh_region *region, void *data)
+{
+ rtx *p_handlers = data;
+ if (! *p_handlers)
+ *p_handlers = alloc_INSN_LIST (region->landing_pad, NULL_RTX);
+}
+
+static void
+arh_to_label (struct eh_region *region, void *data)
+{
+ rtx *p_handlers = data;
+ *p_handlers = alloc_INSN_LIST (region->label, *p_handlers);
+}
+
+rtx
+reachable_handlers (rtx insn)
+{
+ bool is_resx = false;
+ rtx handlers = NULL;
+ int region_number;
+
+ if (JUMP_P (insn)
+ && GET_CODE (PATTERN (insn)) == RESX)
+ {
+ region_number = XINT (PATTERN (insn), 0);
+ is_resx = true;
+ }
+ else
+ {
+ rtx note = find_reg_note (insn, REG_EH_REGION, NULL_RTX);
+ if (!note || INTVAL (XEXP (note, 0)) <= 0)
+ return NULL;
+ region_number = INTVAL (XEXP (note, 0));
+ }
- return info.handlers;
+ foreach_reachable_handler (region_number, is_resx,
+ (cfun->eh->built_landing_pads
+ ? arh_to_landing_pad
+ : arh_to_label),
+ &handlers);
+
+ return handlers;
}
/* Determine if the given INSN can throw an exception that is caught
within the function. */
bool
-can_throw_internal (rtx insn)
+can_throw_internal_1 (int region_number, bool is_resx)
{
struct eh_region *region;
tree type_thrown;
- rtx note;
-
- if (! INSN_P (insn))
- return false;
-
- if (GET_CODE (insn) == INSN
- && GET_CODE (PATTERN (insn)) == SEQUENCE)
- insn = XVECEXP (PATTERN (insn), 0, 0);
-
- if (GET_CODE (insn) == CALL_INSN
- && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER)
- {
- int i;
- for (i = 0; i < 3; ++i)
- {
- rtx sub = XEXP (PATTERN (insn), i);
- for (; sub ; sub = NEXT_INSN (sub))
- if (can_throw_internal (sub))
- return true;
- }
- return false;
- }
- /* Every insn that might throw has an EH_REGION note. */
- note = find_reg_note (insn, REG_EH_REGION, NULL_RTX);
- if (!note || INTVAL (XEXP (note, 0)) <= 0)
- return false;
-
- region = cfun->eh->region_array[INTVAL (XEXP (note, 0))];
+ region = VEC_index (eh_region, cfun->eh->region_array, region_number);
type_thrown = NULL_TREE;
- if (region->type == ERT_THROW)
+ if (is_resx)
+ region = region->outer;
+ else if (region->type == ERT_THROW)
{
type_thrown = region->u.throw.type;
region = region->outer;
return false;
}
+bool
+can_throw_internal (const_rtx insn)
+{
+ rtx note;
+
+ if (! INSN_P (insn))
+ return false;
+
+ if (JUMP_P (insn)
+ && GET_CODE (PATTERN (insn)) == RESX
+ && XINT (PATTERN (insn), 0) > 0)
+ return can_throw_internal_1 (XINT (PATTERN (insn), 0), true);
+
+ if (NONJUMP_INSN_P (insn)
+ && GET_CODE (PATTERN (insn)) == SEQUENCE)
+ insn = XVECEXP (PATTERN (insn), 0, 0);
+
+ /* Every insn that might throw has an EH_REGION note. */
+ note = find_reg_note (insn, REG_EH_REGION, NULL_RTX);
+ if (!note || INTVAL (XEXP (note, 0)) <= 0)
+ return false;
+
+ return can_throw_internal_1 (INTVAL (XEXP (note, 0)), false);
+}
+
/* Determine if the given INSN can throw an exception that is
visible outside the function. */
bool
-can_throw_external (rtx insn)
+can_throw_external_1 (int region_number, bool is_resx)
{
struct eh_region *region;
tree type_thrown;
+
+ region = VEC_index (eh_region, cfun->eh->region_array, region_number);
+
+ type_thrown = NULL_TREE;
+ if (is_resx)
+ region = region->outer;
+ else if (region->type == ERT_THROW)
+ {
+ type_thrown = region->u.throw.type;
+ region = region->outer;
+ }
+
+ /* If the exception is caught or blocked by any containing region,
+ then it is not seen by any calling function. */
+ for (; region ; region = region->outer)
+ if (reachable_next_level (region, type_thrown, NULL) >= RNL_CAUGHT)
+ return false;
+
+ return true;
+}
+
+bool
+can_throw_external (const_rtx insn)
+{
rtx note;
if (! INSN_P (insn))
return false;
- if (GET_CODE (insn) == INSN
+ if (JUMP_P (insn)
+ && GET_CODE (PATTERN (insn)) == RESX
+ && XINT (PATTERN (insn), 0) > 0)
+ return can_throw_external_1 (XINT (PATTERN (insn), 0), true);
+
+ if (NONJUMP_INSN_P (insn)
&& GET_CODE (PATTERN (insn)) == SEQUENCE)
insn = XVECEXP (PATTERN (insn), 0, 0);
- if (GET_CODE (insn) == CALL_INSN
- && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER)
- {
- int i;
- for (i = 0; i < 3; ++i)
- {
- rtx sub = XEXP (PATTERN (insn), i);
- for (; sub ; sub = NEXT_INSN (sub))
- if (can_throw_external (sub))
- return true;
- }
- return false;
- }
-
note = find_reg_note (insn, REG_EH_REGION, NULL_RTX);
if (!note)
{
assume it might throw. Given that the front end and middle
ends mark known NOTHROW functions, this isn't so wildly
inaccurate. */
- return (GET_CODE (insn) == CALL_INSN
+ return (CALL_P (insn)
|| (flag_non_call_exceptions
&& may_trap_p (PATTERN (insn))));
}
if (INTVAL (XEXP (note, 0)) <= 0)
return false;
- region = cfun->eh->region_array[INTVAL (XEXP (note, 0))];
-
- type_thrown = NULL_TREE;
- if (region->type == ERT_THROW)
- {
- type_thrown = region->u.throw.type;
- region = region->outer;
- }
-
- /* If the exception is caught or blocked by any containing region,
- then it is not seen by any calling function. */
- for (; region ; region = region->outer)
- if (reachable_next_level (region, type_thrown, NULL) >= RNL_CAUGHT)
- return false;
-
- return true;
+ return can_throw_external_1 (INTVAL (XEXP (note, 0)), false);
}
-/* Set current_function_nothrow and cfun->all_throwers_are_sibcalls. */
+/* Set TREE_NOTHROW and cfun->all_throwers_are_sibcalls. */
-void
+unsigned int
set_nothrow_function_flags (void)
{
rtx insn;
- current_function_nothrow = 1;
+ /* If we don't know that this implementation of the function will
+ actually be used, then we must not set TREE_NOTHROW, since
+ callers must not assume that this function does not throw. */
+ if (DECL_REPLACEABLE_P (current_function_decl))
+ return 0;
+
+ TREE_NOTHROW (current_function_decl) = 1;
/* Assume cfun->all_throwers_are_sibcalls until we encounter
something that can throw an exception. We specifically exempt
cfun->all_throwers_are_sibcalls = 1;
if (! flag_exceptions)
- return;
+ return 0;
for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
if (can_throw_external (insn))
{
- current_function_nothrow = 0;
+ TREE_NOTHROW (current_function_decl) = 0;
- if (GET_CODE (insn) != CALL_INSN || !SIBLING_CALL_P (insn))
+ if (!CALL_P (insn) || !SIBLING_CALL_P (insn))
{
cfun->all_throwers_are_sibcalls = 0;
- return;
+ return 0;
}
}
insn = XEXP (insn, 1))
if (can_throw_external (insn))
{
- current_function_nothrow = 0;
+ TREE_NOTHROW (current_function_decl) = 0;
- if (GET_CODE (insn) != CALL_INSN || !SIBLING_CALL_P (insn))
+ if (!CALL_P (insn) || !SIBLING_CALL_P (insn))
{
cfun->all_throwers_are_sibcalls = 0;
- return;
+ return 0;
}
}
+ return 0;
}
+struct tree_opt_pass pass_set_nothrow_function_flags =
+{
+ NULL, /* name */
+ NULL, /* gate */
+ set_nothrow_function_flags, /* execute */
+ NULL, /* sub */
+ NULL, /* next */
+ 0, /* static_pass_number */
+ 0, /* tv_id */
+ 0, /* properties_required */
+ 0, /* properties_provided */
+ 0, /* properties_destroyed */
+ 0, /* todo_flags_start */
+ 0, /* todo_flags_finish */
+ 0 /* letter */
+};
+
\f
/* Various hooks for unwind library. */
{
/* Set this so all the registers get saved in our frame; we need to be
able to copy the saved values for any registers from frames we unwind. */
- current_function_has_nonlocal_label = 1;
+ current_function_saves_all_registers = 1;
#ifdef SETUP_FRAME_ADDRESSES
SETUP_FRAME_ADDRESSES ();
}
rtx
-expand_builtin_eh_return_data_regno (tree arglist)
+expand_builtin_eh_return_data_regno (tree exp)
{
- tree which = TREE_VALUE (arglist);
+ tree which = CALL_EXPR_ARG (exp, 0);
unsigned HOST_WIDE_INT iwhich;
if (TREE_CODE (which) != INTEGER_CST)
{
- error ("argument of `__builtin_eh_return_regno' must be constant");
+ error ("argument of %<__builtin_eh_return_regno%> must be constant");
return constm1_rtx;
}
rtx
expand_builtin_extract_return_addr (tree addr_tree)
{
- rtx addr = expand_expr (addr_tree, NULL_RTX, Pmode, 0);
+ rtx addr = expand_expr (addr_tree, NULL_RTX, Pmode, EXPAND_NORMAL);
if (GET_MODE (addr) != Pmode
&& GET_MODE (addr) != VOIDmode)
rtx
expand_builtin_frob_return_addr (tree addr_tree)
{
- rtx addr = expand_expr (addr_tree, NULL_RTX, ptr_mode, 0);
+ rtx addr = expand_expr (addr_tree, NULL_RTX, ptr_mode, EXPAND_NORMAL);
addr = convert_memory_address (Pmode, addr);
rtx tmp;
#ifdef EH_RETURN_STACKADJ_RTX
- tmp = expand_expr (stackadj_tree, cfun->eh->ehr_stackadj, VOIDmode, 0);
+ tmp = expand_expr (stackadj_tree, cfun->eh->ehr_stackadj,
+ VOIDmode, EXPAND_NORMAL);
tmp = convert_memory_address (Pmode, tmp);
if (!cfun->eh->ehr_stackadj)
cfun->eh->ehr_stackadj = copy_to_reg (tmp);
emit_move_insn (cfun->eh->ehr_stackadj, tmp);
#endif
- tmp = expand_expr (handler_tree, cfun->eh->ehr_handler, VOIDmode, 0);
+ tmp = expand_expr (handler_tree, cfun->eh->ehr_handler,
+ VOIDmode, EXPAND_NORMAL);
tmp = convert_memory_address (Pmode, tmp);
if (!cfun->eh->ehr_handler)
cfun->eh->ehr_handler = copy_to_reg (tmp);
rtx
expand_builtin_extend_pointer (tree addr_tree)
{
- rtx addr = expand_expr (addr_tree, NULL_RTX, ptr_mode, 0);
+ rtx addr = expand_expr (addr_tree, NULL_RTX, ptr_mode, EXPAND_NORMAL);
int extend;
#ifdef POINTERS_EXTEND_UNSIGNED
Add a cleanup action to the chain to catch these. */
else if (next <= 0)
next = add_action_record (ar_hash, 0, 0);
-
+
return add_action_record (ar_hash, region->u.allowed.filter, next);
case ERT_MUST_NOT_THROW:
return collect_one_action_chain (ar_hash, region->outer);
default:
- abort ();
+ gcc_unreachable ();
}
}
The new note numbers will not refer to region numbers, but
instead to call site entries. */
-void
+unsigned int
convert_to_eh_region_ranges (void)
{
rtx insn, iter, note;
int call_site = 0;
if (USING_SJLJ_EXCEPTIONS || cfun->eh->region_tree == NULL)
- return;
+ return 0;
VARRAY_UCHAR_INIT (cfun->eh->action_record_data, 64, "action_record_data");
rtx this_landing_pad;
insn = iter;
- if (GET_CODE (insn) == INSN
+ if (NONJUMP_INSN_P (insn)
&& GET_CODE (PATTERN (insn)) == SEQUENCE)
insn = XVECEXP (PATTERN (insn), 0, 0);
note = find_reg_note (insn, REG_EH_REGION, NULL_RTX);
if (!note)
{
- if (! (GET_CODE (insn) == CALL_INSN
+ if (! (CALL_P (insn)
|| (flag_non_call_exceptions
&& may_trap_p (PATTERN (insn)))))
continue;
{
if (INTVAL (XEXP (note, 0)) <= 0)
continue;
- region = cfun->eh->region_array[INTVAL (XEXP (note, 0))];
+ region = VEC_index (eh_region, cfun->eh->region_array, INTVAL (XEXP (note, 0)));
this_action = collect_one_action_chain (ar_hash, region);
}
}
htab_delete (ar_hash);
+ return 0;
}
+struct tree_opt_pass pass_convert_to_eh_region_ranges =
+{
+ "eh-ranges", /* name */
+ NULL, /* gate */
+ convert_to_eh_region_ranges, /* execute */
+ NULL, /* sub */
+ NULL, /* next */
+ 0, /* static_pass_number */
+ 0, /* tv_id */
+ 0, /* properties_required */
+ 0, /* properties_provided */
+ 0, /* properties_destroyed */
+ 0, /* todo_flags_start */
+ TODO_dump_func, /* todo_flags_finish */
+ 0 /* letter */
+};
+
\f
static void
push_uleb128 (varray_type *data_area, unsigned int value)
static void
dw2_output_call_site_table (void)
{
- const char *const function_start_lab
- = IDENTIFIER_POINTER (current_function_func_begin_label);
int n = cfun->eh->call_site_data_used;
int i;
/* ??? Perhaps use attr_length to choose data1 or data2 instead of
data4 if the function is small enough. */
#ifdef HAVE_AS_LEB128
- dw2_asm_output_delta_uleb128 (reg_start_lab, function_start_lab,
+ dw2_asm_output_delta_uleb128 (reg_start_lab,
+ current_function_func_begin_label,
"region %d start", i);
dw2_asm_output_delta_uleb128 (reg_end_lab, reg_start_lab,
"length");
if (cs->landing_pad)
- dw2_asm_output_delta_uleb128 (landing_pad_lab, function_start_lab,
+ dw2_asm_output_delta_uleb128 (landing_pad_lab,
+ current_function_func_begin_label,
"landing pad");
else
dw2_asm_output_data_uleb128 (0, "landing pad");
#else
- dw2_asm_output_delta (4, reg_start_lab, function_start_lab,
+ dw2_asm_output_delta (4, reg_start_lab,
+ current_function_func_begin_label,
"region %d start", i);
dw2_asm_output_delta (4, reg_end_lab, reg_start_lab, "length");
if (cs->landing_pad)
- dw2_asm_output_delta (4, landing_pad_lab, function_start_lab,
+ dw2_asm_output_delta (4, landing_pad_lab,
+ current_function_func_begin_label,
"landing pad");
else
dw2_asm_output_data (4, 0, "landing pad");
call_site_base += n;
}
-/* Tell assembler to switch to the section for the exception handling
- table. */
+#ifndef TARGET_UNWIND_INFO
+/* Switch to the section that should be used for exception tables. */
-void
-default_exception_section (void)
+static void
+switch_to_exception_section (const char * ARG_UNUSED (fnname))
{
- if (targetm.have_named_sections)
+ section *s;
+
+ if (exception_section)
+ s = exception_section;
+ else
{
- int flags;
-#ifdef HAVE_LD_RO_RW_SECTION_MIXING
- int tt_format = ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/0, /*global=*/1);
+ /* Compute the section and cache it into exception_section,
+ unless it depends on the function name. */
+ if (targetm.have_named_sections)
+ {
+ int flags;
- flags = (! flag_pic
- || ((tt_format & 0x70) != DW_EH_PE_absptr
- && (tt_format & 0x70) != DW_EH_PE_aligned))
- ? 0 : SECTION_WRITE;
-#else
- flags = SECTION_WRITE;
+ if (EH_TABLES_CAN_BE_READ_ONLY)
+ {
+ int tt_format =
+ ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/0, /*global=*/1);
+ flags = ((! flag_pic
+ || ((tt_format & 0x70) != DW_EH_PE_absptr
+ && (tt_format & 0x70) != DW_EH_PE_aligned))
+ ? 0 : SECTION_WRITE);
+ }
+ else
+ flags = SECTION_WRITE;
+
+#ifdef HAVE_LD_EH_GC_SECTIONS
+ if (flag_function_sections)
+ {
+ char *section_name = xmalloc (strlen (fnname) + 32);
+ sprintf (section_name, ".gcc_except_table.%s", fnname);
+ s = get_section (section_name, flags, NULL);
+ free (section_name);
+ }
+ else
+#endif
+ exception_section
+ = s = get_section (".gcc_except_table", flags, NULL);
+ }
+ else
+ exception_section
+ = s = flag_pic ? data_section : readonly_data_section;
+ }
+
+ switch_to_section (s);
+}
#endif
- named_section_flags (".gcc_except_table", flags);
+
+
+/* Output a reference from an exception table to the type_info object TYPE.
+ TT_FORMAT and TT_FORMAT_SIZE describe the DWARF encoding method used for
+ the value. */
+
+static void
+output_ttype (tree type, int tt_format, int tt_format_size)
+{
+ rtx value;
+ bool public = true;
+
+ if (type == NULL_TREE)
+ value = const0_rtx;
+ else
+ {
+ struct varpool_node *node;
+
+ type = lookup_type_for_runtime (type);
+ value = expand_expr (type, NULL_RTX, VOIDmode, EXPAND_INITIALIZER);
+
+ /* Let cgraph know that the rtti decl is used. Not all of the
+ paths below go through assemble_integer, which would take
+ care of this for us. */
+ STRIP_NOPS (type);
+ if (TREE_CODE (type) == ADDR_EXPR)
+ {
+ type = TREE_OPERAND (type, 0);
+ if (TREE_CODE (type) == VAR_DECL)
+ {
+ node = varpool_node (type);
+ if (node)
+ varpool_mark_needed_node (node);
+ public = TREE_PUBLIC (type);
+ }
+ }
+ else
+ gcc_assert (TREE_CODE (type) == INTEGER_CST);
}
- else if (flag_pic)
- data_section ();
+
+ /* Allow the target to override the type table entry format. */
+ if (targetm.asm_out.ttype (value))
+ return;
+
+ if (tt_format == DW_EH_PE_absptr || tt_format == DW_EH_PE_aligned)
+ assemble_integer (value, tt_format_size,
+ tt_format_size * BITS_PER_UNIT, 1);
else
- readonly_data_section ();
+ dw2_asm_output_encoded_addr_rtx (tt_format, value, public, NULL);
}
void
-output_function_exception_table (void)
+output_function_exception_table (const char * ARG_UNUSED (fnname))
{
int tt_format, cs_format, lp_format, i, n;
#ifdef HAVE_AS_LEB128
if (! cfun->uses_eh_lsda)
return;
-#ifdef IA64_UNWIND_INFO
+ if (eh_personality_libfunc)
+ assemble_external_libcall (eh_personality_libfunc);
+
+#ifdef TARGET_UNWIND_INFO
+ /* TODO: Move this into target file. */
fputs ("\t.personality\t", asm_out_file);
output_addr_const (asm_out_file, eh_personality_libfunc);
fputs ("\n\t.handlerdata\n", asm_out_file);
/* Note that varasm still thinks we're in the function's code section.
The ".endp" directive that will immediately follow will take us back. */
#else
- (*targetm.asm_out.exception_section) ();
+ switch_to_exception_section (fnname);
#endif
- have_tt_data = (VARRAY_ACTIVE_SIZE (cfun->eh->ttype_data) > 0
+ /* If the target wants a label to begin the table, emit it here. */
+ targetm.asm_out.except_table_label (asm_out_file);
+
+ have_tt_data = (VEC_length (tree, cfun->eh->ttype_data) > 0
|| VARRAY_ACTIVE_SIZE (cfun->eh->ehspec_data) > 0);
/* Indicate the format of the @TType entries. */
assemble_align (tt_format_size * BITS_PER_UNIT);
}
- (*targetm.asm_out.internal_label) (asm_out_file, "LLSDA",
+ targetm.asm_out.internal_label (asm_out_file, "LLSDA",
current_function_funcdef_no);
/* The LSDA header. */
after_disp = (1 + size_of_uleb128 (call_site_len)
+ call_site_len
+ VARRAY_ACTIVE_SIZE (cfun->eh->action_record_data)
- + (VARRAY_ACTIVE_SIZE (cfun->eh->ttype_data)
+ + (VEC_length (tree, cfun->eh->ttype_data)
* tt_format_size));
disp = after_disp;
if (have_tt_data)
assemble_align (tt_format_size * BITS_PER_UNIT);
- i = VARRAY_ACTIVE_SIZE (cfun->eh->ttype_data);
+ i = VEC_length (tree, cfun->eh->ttype_data);
while (i-- > 0)
{
- tree type = VARRAY_TREE (cfun->eh->ttype_data, i);
- rtx value;
-
- if (type == NULL_TREE)
- value = const0_rtx;
- else
- {
- struct cgraph_varpool_node *node;
-
- type = lookup_type_for_runtime (type);
- value = expand_expr (type, NULL_RTX, VOIDmode, EXPAND_INITIALIZER);
-
- /* Let cgraph know that the rtti decl is used. Not all of the
- paths below go through assemble_integer, which would take
- care of this for us. */
- if (TREE_CODE (type) == ADDR_EXPR)
- {
- type = TREE_OPERAND (type, 0);
- node = cgraph_varpool_node (type);
- if (node)
- cgraph_varpool_mark_needed_node (node);
- }
- else if (TREE_CODE (type) != INTEGER_CST)
- abort ();
- }
-
- if (tt_format == DW_EH_PE_absptr || tt_format == DW_EH_PE_aligned)
- assemble_integer (value, tt_format_size,
- tt_format_size * BITS_PER_UNIT, 1);
- else
- dw2_asm_output_encoded_addr_rtx (tt_format, value, NULL);
+ tree type = VEC_index (tree, cfun->eh->ttype_data, i);
+ output_ttype (type, tt_format, tt_format_size);
}
#ifdef HAVE_AS_LEB128
/* ??? Decode and interpret the data for flag_debug_asm. */
n = VARRAY_ACTIVE_SIZE (cfun->eh->ehspec_data);
for (i = 0; i < n; ++i)
- dw2_asm_output_data (1, VARRAY_UCHAR (cfun->eh->ehspec_data, i),
- (i ? NULL : "Exception specification table"));
+ {
+ if (targetm.arm_eabi_unwinder)
+ {
+ tree type = VARRAY_TREE (cfun->eh->ehspec_data, i);
+ output_ttype (type, tt_format, tt_format_size);
+ }
+ else
+ dw2_asm_output_data (1, VARRAY_UCHAR (cfun->eh->ehspec_data, i),
+ (i ? NULL : "Exception specification table"));
+ }
+
+ switch_to_section (current_function_section ());
+}
+
+void
+set_eh_throw_stmt_table (struct function *fun, struct htab *table)
+{
+ fun->eh->throw_stmt_table = table;
+}
+
+htab_t
+get_eh_throw_stmt_table (struct function *fun)
+{
+ return fun->eh->throw_stmt_table;
+}
+
+/* Dump EH information to OUT. */
+void
+dump_eh_tree (FILE *out, struct function *fun)
+{
+ struct eh_region *i;
+ int depth = 0;
+ static const char * const type_name[] = {"unknown", "cleanup", "try", "catch",
+ "allowed_exceptions", "must_not_throw",
+ "throw"};
+
+ i = fun->eh->region_tree;
+ if (! i)
+ return;
+
+ fprintf (out, "Eh tree:\n");
+ while (1)
+ {
+ fprintf (out, " %*s %i %s", depth * 2, "",
+ i->region_number, type_name [(int)i->type]);
+ if (i->tree_label)
+ {
+ fprintf (out, " tree_label:");
+ print_generic_expr (out, i->tree_label, 0);
+ }
+ fprintf (out, "\n");
+ /* If there are sub-regions, process them. */
+ if (i->inner)
+ i = i->inner, depth++;
+ /* If there are peers, process them. */
+ else if (i->next_peer)
+ i = i->next_peer;
+ /* Otherwise, step back up the tree to the next peer. */
+ else
+ {
+ do {
+ i = i->outer;
+ depth--;
+ if (i == NULL)
+ return;
+ } while (i->next_peer == NULL);
+ i = i->next_peer;
+ }
+ }
+}
+
+/* Verify some basic invariants on EH datastructures. Could be extended to
+ catch more. */
+void
+verify_eh_tree (struct function *fun)
+{
+ struct eh_region *i, *outer = NULL;
+ bool err = false;
+ int nvisited = 0;
+ int count = 0;
+ int j;
+ int depth = 0;
+
+ i = fun->eh->region_tree;
+ if (! i)
+ return;
+ for (j = fun->eh->last_region_number; j > 0; --j)
+ if ((i = VEC_index (eh_region, cfun->eh->region_array, j)))
+ {
+ count++;
+ if (i->region_number != j)
+ {
+ error ("region_array is corrupted for region %i", i->region_number);
+ err = true;
+ }
+ }
+
+ while (1)
+ {
+ if (VEC_index (eh_region, cfun->eh->region_array, i->region_number) != i)
+ {
+ error ("region_array is corrupted for region %i", i->region_number);
+ err = true;
+ }
+ if (i->outer != outer)
+ {
+ error ("outer block of region %i is wrong", i->region_number);
+ err = true;
+ }
+ if (i->may_contain_throw && outer && !outer->may_contain_throw)
+ {
+ error ("region %i may contain throw and is contained in region that may not",
+ i->region_number);
+ err = true;
+ }
+ if (depth < 0)
+ {
+ error ("negative nesting depth of region %i", i->region_number);
+ err = true;
+ }
+ nvisited ++;
+ /* If there are sub-regions, process them. */
+ if (i->inner)
+ outer = i, i = i->inner, depth++;
+ /* If there are peers, process them. */
+ else if (i->next_peer)
+ i = i->next_peer;
+ /* Otherwise, step back up the tree to the next peer. */
+ else
+ {
+ do {
+ i = i->outer;
+ depth--;
+ if (i == NULL)
+ {
+ if (depth != -1)
+ {
+ error ("tree list ends on depth %i", depth + 1);
+ err = true;
+ }
+ if (count != nvisited)
+ {
+ error ("array does not match the region tree");
+ err = true;
+ }
+ if (err)
+ {
+ dump_eh_tree (stderr, fun);
+ internal_error ("verify_eh_tree failed");
+ }
+ return;
+ }
+ outer = i->outer;
+ } while (i->next_peer == NULL);
+ i = i->next_peer;
+ }
+ }
+}
+
+/* Initialize unwind_resume_libfunc. */
+
+void
+default_init_unwind_resume_libfunc (void)
+{
+ /* The default c++ routines aren't actually c++ specific, so use those. */
+ unwind_resume_libfunc =
+ init_one_libfunc ( USING_SJLJ_EXCEPTIONS ? "_Unwind_SjLj_Resume"
+ : "_Unwind_Resume");
+}
+
+\f
+static bool
+gate_handle_eh (void)
+{
+ return doing_eh (0);
+}
- function_section (current_function_decl);
+/* Complete generation of exception handling code. */
+static unsigned int
+rest_of_handle_eh (void)
+{
+ cleanup_cfg (CLEANUP_NO_INSN_DEL);
+ finish_eh_generation ();
+ cleanup_cfg (CLEANUP_NO_INSN_DEL);
+ return 0;
}
+struct tree_opt_pass pass_rtl_eh =
+{
+ "eh", /* name */
+ gate_handle_eh, /* gate */
+ rest_of_handle_eh, /* execute */
+ NULL, /* sub */
+ NULL, /* next */
+ 0, /* static_pass_number */
+ TV_JUMP, /* tv_id */
+ 0, /* properties_required */
+ 0, /* properties_provided */
+ 0, /* properties_destroyed */
+ 0, /* todo_flags_start */
+ TODO_dump_func, /* todo_flags_finish */
+ 'h' /* letter */
+};
+
#include "gt-except.h"
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