/* 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, 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 "config.h"
#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
#include "rtl.h"
#include "tree.h"
#include "flags.h"
#include "ggc.h"
#include "tm_p.h"
#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. */
-#ifndef EH_RETURN_STACKADJ_RTX
-#define EH_RETURN_STACKADJ_RTX 0
-#endif
-#ifndef EH_RETURN_HANDLER_RTX
-#define EH_RETURN_HANDLER_RTX 0
-#endif
#ifndef EH_RETURN_DATA_REGNO
#define EH_RETURN_DATA_REGNO(N) INVALID_REGNUM
#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) PARAMS ((void));
+tree (*lang_protect_cleanup_actions) (void);
/* Return true if type A catches type B. */
-int (*lang_eh_type_covers) PARAMS ((tree a, tree b));
+int (*lang_eh_type_covers) (tree a, tree b);
/* Map a type to a runtime object to match type. */
-tree (*lang_eh_runtime_type) PARAMS ((tree));
+tree (*lang_eh_runtime_type) (tree);
+
+/* A hash table of label to region number. */
-/* A list of labels used for exception handlers. */
-rtx exception_handler_labels;
+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(()) int call_site_base;
+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
{
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. */
- 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 {
- tree exp;
- } cleanup;
-
- /* The real region (by expression and by pointer) that fixup code
- should live in. */
- struct {
- tree cleanup_exp;
- struct eh_region *real_region;
- } fixup;
- } u;
+ struct eh_region_u_cleanup {
+ struct eh_region *prev_try;
+ } GTY ((tag ("ERT_CLEANUP"))) cleanup;
+ } 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;
/* The RESX insn for handing off control to the next outermost handler,
if appropriate. */
rtx resume;
+
+ /* True if something in this region may throw. */
+ 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
+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;
+ VEC(eh_region,gc) *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;
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;
- 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;
rtx sjlj_fc;
rtx sjlj_exit_after;
-};
+ htab_t GTY((param_is (struct throw_stmt_node))) throw_stmt_table;
+};
\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 struct eh_region *expand_eh_region_end PARAMS ((void));
-
-static rtx get_exception_filter PARAMS ((struct function *));
-
-static void collect_eh_region_array PARAMS ((void));
-static void resolve_fixup_regions PARAMS ((void));
-static void remove_fixup_regions PARAMS ((void));
-static void convert_from_eh_region_ranges_1 PARAMS ((rtx *, int *, int));
-
-static struct eh_region *duplicate_eh_region_1 PARAMS ((struct eh_region *,
- struct inline_remap *));
-static void duplicate_eh_region_2 PARAMS ((struct eh_region *,
- struct eh_region **));
-static int ttypes_filter_eq PARAMS ((const PTR,
- const PTR));
-static hashval_t ttypes_filter_hash PARAMS ((const PTR));
-static int ehspec_filter_eq PARAMS ((const PTR,
- const PTR));
-static hashval_t ehspec_filter_hash PARAMS ((const PTR));
-static int add_ttypes_entry PARAMS ((htab_t, tree));
-static int add_ehspec_entry PARAMS ((htab_t, htab_t,
- tree));
-static void assign_filter_values PARAMS ((void));
-static void build_post_landing_pads PARAMS ((void));
-static void connect_post_landing_pads PARAMS ((void));
-static void dw2_build_landing_pads PARAMS ((void));
+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 void remove_unreachable_regions (rtx);
+
+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 hashval_t ehspec_filter_hash (const void *);
+static int add_ttypes_entry (htab_t, tree);
+static int add_ehspec_entry (htab_t, htab_t, tree);
+static void assign_filter_values (void);
+static void build_post_landing_pads (void);
+static void connect_post_landing_pads (void);
+static void dw2_build_landing_pads (void);
struct sjlj_lp_info;
-static bool sjlj_find_directly_reachable_regions
- PARAMS ((struct sjlj_lp_info *));
-static void sjlj_assign_call_site_values
- PARAMS ((rtx, struct sjlj_lp_info *));
-static void sjlj_mark_call_sites
- PARAMS ((struct sjlj_lp_info *));
-static void sjlj_emit_function_enter PARAMS ((rtx));
-static void sjlj_emit_function_exit PARAMS ((void));
-static void sjlj_emit_dispatch_table
- PARAMS ((rtx, struct sjlj_lp_info *));
-static void sjlj_build_landing_pads PARAMS ((void));
-
-static void remove_exception_handler_label PARAMS ((rtx));
-static void remove_eh_handler PARAMS ((struct eh_region *));
-
-struct reachable_info;
+static bool sjlj_find_directly_reachable_regions (struct sjlj_lp_info *);
+static void sjlj_assign_call_site_values (rtx, struct sjlj_lp_info *);
+static void sjlj_mark_call_sites (struct sjlj_lp_info *);
+static void sjlj_emit_function_enter (rtx);
+static void sjlj_emit_function_exit (void);
+static void sjlj_emit_dispatch_table (rtx, struct sjlj_lp_info *);
+static void sjlj_build_landing_pads (void);
+
+static hashval_t ehl_hash (const void *);
+static int ehl_eq (const void *, const void *);
+static void add_ehl_entry (rtx, struct eh_region *);
+static void remove_exception_handler_label (rtx);
+static void remove_eh_handler (struct eh_region *);
+static int for_each_eh_label_1 (void **, void *);
/* The return value of reachable_next_level. */
enum reachable_code
RNL_BLOCKED
};
-static int check_handled PARAMS ((tree, tree));
-static void add_reachable_handler
- PARAMS ((struct reachable_info *, struct eh_region *,
- struct eh_region *));
-static enum reachable_code reachable_next_level
- PARAMS ((struct eh_region *, tree, struct reachable_info *));
-
-static int action_record_eq PARAMS ((const PTR,
- const PTR));
-static hashval_t action_record_hash PARAMS ((const PTR));
-static int add_action_record PARAMS ((htab_t, int, int));
-static int collect_one_action_chain PARAMS ((htab_t,
- struct eh_region *));
-static int add_call_site PARAMS ((rtx, int));
-
-static void push_uleb128 PARAMS ((varray_type *,
- unsigned int));
-static void push_sleb128 PARAMS ((varray_type *, int));
+struct reachable_info;
+static enum reachable_code reachable_next_level (struct eh_region *, tree,
+ struct reachable_info *);
+
+static int action_record_eq (const void *, const void *);
+static hashval_t action_record_hash (const void *);
+static int add_action_record (htab_t, int, int);
+static int collect_one_action_chain (htab_t, struct eh_region *);
+static int add_call_site (rtx, int);
+
+static void push_uleb128 (varray_type *, unsigned int);
+static void push_sleb128 (varray_type *, int);
#ifndef HAVE_AS_LEB128
-static int dw2_size_of_call_site_table PARAMS ((void));
-static int sjlj_size_of_call_site_table PARAMS ((void));
+static int dw2_size_of_call_site_table (void);
+static int sjlj_size_of_call_site_table (void);
#endif
-static void dw2_output_call_site_table PARAMS ((void));
-static void sjlj_output_call_site_table PARAMS ((void));
+static void dw2_output_call_site_table (void);
+static void sjlj_output_call_site_table (void);
\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.
+ DO_WARN is nonzero if we want to inform the user that exception
+ handling is turned off.
This is used to ensure that -fexceptions has been specified if the
compiler tries to use any exception-specific functions. */
int
-doing_eh (do_warn)
- int do_warn;
+doing_eh (int do_warn)
{
if (! flag_exceptions)
{
\f
void
-init_eh ()
+init_eh (void)
{
- 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));
integer_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_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);
DECL_FIELD_CONTEXT (f_data) = sjlj_fc_type_node;
#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
- /* This is 2 for builtin_setjmp, plus whatever the target requires
- via STACK_SAVEAREA_MODE (SAVE_NONLOCAL). */
- tmp = build_int_2 ((GET_MODE_SIZE (STACK_SAVEAREA_MODE (SAVE_NONLOCAL))
- / GET_MODE_SIZE (Pmode)) + 2 - 1, 0);
+ /* builtin_setjmp takes a pointer to 5 words. */
+ 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);
}
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;
+init_eh_for_function (void)
{
- 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);
+ cfun->eh = ggc_alloc_cleared (sizeof (struct eh_status));
}
-
-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;
-}
-
\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 ()
+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 = (struct eh_region *) xcalloc (1, 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 (NULL, NOTE_INSN_EH_REGION_BEG);
- NOTE_EH_HANDLER (note) = new_region->region_number;
-}
+ new->region_number = ++cfun->eh->last_region_number;
-/* Common code to end a region. Returns the region just ended. */
-
-static struct eh_region *
-expand_eh_region_end ()
-{
- struct eh_region *cur_region = cfun->eh->cur_region;
- rtx note;
-
- /* Create a nute marking the end of this region. */
- note = emit_note (NULL, NOTE_INSN_EH_REGION_END);
- NOTE_EH_HANDLER (note) = cur_region->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 (handler)
- 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;
-
- around_label = gen_label_rtx ();
- emit_jump (around_label);
-
- emit_label (region->label);
-
- /* Give the language a chance to specify an action to be taken if an
- exception is thrown that would propogate 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 (Pmode);
- 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 ()
+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, 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 (type_or_list)
- 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);
+ 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 ();
-
- 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 ()
+struct eh_region *
+gen_eh_region_allowed (struct eh_region *outer, tree allowed)
{
- struct eh_region *try_region, *catch_region;
-
- if (! doing_eh (0))
- return;
+ struct eh_region *region = gen_eh_region (ERT_ALLOWED_EXCEPTIONS, outer);
+ region->u.allowed.type_list = allowed;
- catch_region = 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 ()
+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;
+ return gen_eh_region (ERT_MUST_NOT_THROW, outer);
+}
- emit_label (try_region->u.try.continue_label);
+int
+get_eh_region_number (struct eh_region *region)
+{
+ return region->region_number;
}
-/* 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.
+bool
+get_eh_region_may_contain_throw (struct eh_region *region)
+{
+ return region->may_contain_throw;
+}
- ??? 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. */
+tree
+get_eh_region_tree_label (struct eh_region *region)
+{
+ return region->tree_label;
+}
void
-expand_eh_region_end_allowed (allowed, failure)
- tree allowed, failure;
+set_eh_region_tree_label (struct eh_region *region, tree lab)
{
- 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);
+ region->tree_label = lab;
}
-
-/* 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. */
-
+\f
void
-expand_eh_region_end_must_not_throw (failure)
- tree failure;
+expand_resx_expr (tree exp)
{
- 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);
+ 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);
- emit_label (around_label);
+ gcc_assert (!reg->resume);
+ reg->resume = emit_jump_insn (gen_rtx_RESX (VOIDmode, region_nr));
+ emit_barrier ();
}
-/* 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. */
+/* 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
-expand_eh_region_end_throw (type)
- tree type;
+note_eh_region_may_contain_throw (struct eh_region *region)
{
- struct eh_region *region;
-
- if (! doing_eh (0))
- return;
-
- region = expand_eh_region_end ();
- region->type = ERT_THROW;
- region->u.throw.type = type;
+ while (region && !region->may_contain_throw)
+ {
+ region->may_contain_throw = 1;
+ region = region->outer;
+ }
}
-/* 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. */
-
void
-expand_eh_region_end_fixup (handler)
- tree handler;
+note_current_region_may_contain_throw (void)
{
- struct eh_region *fixup;
-
- if (! doing_eh (0))
- return;
-
- fixup = expand_eh_region_end ();
- fixup->type = ERT_FIXUP;
- fixup->u.fixup.cleanup_exp = handler;
+ note_eh_region_may_contain_throw (cfun->eh->cur_region);
}
+
/* Return an rtl expression for a pointer to the exception object
within a handler. */
rtx
-get_exception_pointer (fun)
- struct function *fun;
+get_exception_pointer (struct function *fun)
{
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 an rtl expression for the exception dispatch filter
within a handler. */
-static rtx
-get_exception_filter (fun)
- struct function *fun;
+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
-/* 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
- 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
-collect_eh_region_array ()
+void
+collect_eh_region_array (void)
{
- struct eh_region **array, *i;
+ struct eh_region *i;
i = cfun->eh->region_tree;
if (! i)
return;
- array = xcalloc (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)
}
}
+/* Remove all regions whose labels are not reachable from insns. */
+
static void
-resolve_fixup_regions ()
+remove_unreachable_regions (rtx insns)
{
- int i, j, n = cfun->eh->last_region_number;
+ int i, *uid_region_num;
+ bool *reachable;
+ struct eh_region *r;
+ rtx insn;
- for (i = 1; i <= n; ++i)
- {
- struct eh_region *fixup = cfun->eh->region_array[i];
- struct eh_region *cleanup = 0;
+ uid_region_num = xcalloc (get_max_uid (), sizeof(int));
+ reachable = xcalloc (cfun->eh->last_region_number + 1, sizeof(bool));
- if (! fixup || fixup->type != ERT_FIXUP)
+ for (i = cfun->eh->last_region_number; i > 0; --i)
+ {
+ r = VEC_index (eh_region, cfun->eh->region_array, i);
+ if (!r || r->region_number != i)
continue;
- for (j = 1; j <= n; ++j)
+ if (r->resume)
{
- cleanup = cfun->eh->region_array[j];
- if (cleanup->type == ERT_CLEANUP
- && cleanup->u.cleanup.exp == fixup->u.fixup.cleanup_exp)
- break;
+ gcc_assert (!uid_region_num[INSN_UID (r->resume)]);
+ uid_region_num[INSN_UID (r->resume)] = i;
+ }
+ if (r->label)
+ {
+ gcc_assert (!uid_region_num[INSN_UID (r->label)]);
+ uid_region_num[INSN_UID (r->label)] = i;
}
- if (j > n)
- abort ();
-
- fixup->u.fixup.real_region = cleanup->outer;
}
-}
-/* Now that we've discovered what region actually encloses a fixup,
- we can shuffle pointers and remove them from the tree. */
+ for (insn = insns; insn; insn = NEXT_INSN (insn))
+ reachable[uid_region_num[INSN_UID (insn)]] = true;
-static void
-remove_fixup_regions ()
-{
- 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)
+ r = VEC_index (eh_region, cfun->eh->region_array, i);
+ if (r && r->region_number == i && !reachable[i])
{
- 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)
+ bool kill_it = true;
+ switch (r->type)
{
- p->outer = parent;
- if (! p->next_peer)
+ 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])
+ {
+ kill_it = false;
+ break;
+ }
break;
+ }
+
+ default:
+ 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;
+ if (kill_it)
+ remove_eh_handler (r);
}
-
- remove_eh_handler (fixup);
}
+
+ 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. */
+/* Set up EH labels for RTL. */
-static void
-convert_from_eh_region_ranges_1 (pinsns, orig_sp, cur)
- rtx *pinsns;
- int *orig_sp;
- int cur;
+void
+convert_from_eh_region_ranges (void)
{
- int *sp = orig_sp;
- rtx insn, next;
+ rtx insns = get_insns ();
+ int i, n = cfun->eh->last_region_number;
- for (insn = *pinsns; insn ; insn = next)
+ /* 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)
{
- 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)
- {
- 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)
- {
- r = r->outer;
- cur = r ? r->region_number : 0;
- }
- }
- 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));
- }
+ struct eh_region *region;
- 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);
- }
- }
+ region = VEC_index (eh_region, cfun->eh->region_array, i);
+ if (region && region->tree_label)
+ region->label = DECL_RTL_IF_SET (region->tree_label);
}
- if (sp != orig_sp)
- abort ();
+ remove_unreachable_regions (insns);
}
-void
-convert_from_eh_region_ranges ()
+static void
+add_ehl_entry (rtx label, struct eh_region *region)
{
- int *stack;
- rtx insns;
+ struct ehl_map_entry **slot, *entry;
+
+ LABEL_PRESERVE_P (label) = 1;
+
+ entry = ggc_alloc (sizeof (*entry));
+ entry->label = label;
+ entry->region = region;
- collect_eh_region_array ();
- resolve_fixup_regions ();
+ slot = (struct ehl_map_entry **)
+ htab_find_slot (cfun->eh->exception_handler_label_map, entry, INSERT);
- stack = xmalloc (sizeof (int) * (cfun->eh->last_region_number + 1));
- insns = get_insns ();
- convert_from_eh_region_ranges_1 (&insns, stack, 0);
- free (stack);
+ /* 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. */
+ gcc_assert (!*slot || cfun->eh->built_landing_pads);
- remove_fixup_regions ();
+ *slot = entry;
}
void
-find_exception_handler_labels ()
+find_exception_handler_labels (void)
{
- 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;
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;
- if (! region)
+ region = VEC_index (eh_region, cfun->eh->region_array, i);
+ 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);
}
-\f
-static struct eh_region *
-duplicate_eh_region_1 (o, map)
- struct eh_region *o;
- struct inline_remap *map;
-{
- struct eh_region *n
- = (struct eh_region *) xcalloc (1, sizeof (struct eh_region));
+/* Returns true if the current function has exception handling regions. */
- n->region_number = o->region_number + cfun->eh->last_region_number;
- n->type = o->type;
+bool
+current_function_has_exception_handlers (void)
+{
+ int i;
- switch (n->type)
+ for (i = cfun->eh->last_region_number; i > 0; --i)
{
- case ERT_CLEANUP:
- case ERT_MUST_NOT_THROW:
- break;
-
- 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;
+ struct eh_region *region;
- case ERT_CATCH:
- n->u.catch.type_list = o->u.catch.type_list;
- break;
+ region = VEC_index (eh_region, cfun->eh->region_array, i);
+ if (region
+ && region->region_number == i
+ && region->type != ERT_THROW)
+ return true;
+ }
- case ERT_ALLOWED_EXCEPTIONS:
- n->u.allowed.type_list = o->u.allowed.type_list;
- break;
+ return false;
+}
+\f
+/* A subroutine of duplicate_eh_regions. Search the region tree under O
+ for the minimum and maximum region numbers. Update *MIN and *MAX. */
- case ERT_THROW:
- n->u.throw.type = o->u.throw.type;
-
- default:
- abort ();
- }
+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;
- if (o->label)
- n->label = get_label_from_map (map, CODE_LABEL_NUMBER (o->label));
- if (o->resume)
+ if (o->inner)
{
- n->resume = map->insn_map[INSN_UID (o->resume)];
- if (n->resume == NULL)
- abort ();
+ 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);
+ }
}
-
- return n;
}
-static void
-duplicate_eh_region_2 (o, n_array)
- struct eh_region *o;
- struct eh_region **n_array;
+/* 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. */
+
+static eh_region
+duplicate_eh_regions_1 (eh_region old, eh_region outer, int eh_offset)
{
- struct eh_region *n = n_array[o->region_number];
+ eh_region ret, n;
- 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;
+ ret = n = ggc_alloc (sizeof (struct eh_region));
- 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;
+ *n = *old;
+ n->outer = outer;
+ n->next_peer = NULL;
+ gcc_assert (!old->aka);
- default:
- break;
+ n->region_number += eh_offset;
+ VEC_replace (eh_region, cfun->eh->region_array, n->region_number, n);
+
+ if (old->inner)
+ {
+ 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);
+ }
}
- 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];
-}
+ return ret;
+}
+
+/* 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 (ifun, map)
- struct function *ifun;
- struct inline_remap *map;
+duplicate_eh_regions (struct function *ifun, duplicate_eh_regions_map map,
+ void *data, int copy_region, int outer_region)
{
- int ifun_last_region_number = ifun->eh->last_region_number;
- struct eh_region **n_array, *root, *cur;
- int i;
+ eh_region cur, prev_try, outer, *splice;
+ int i, min_region, max_region, eh_offset, cfun_last_region_number;
+ int num_regions;
- if (ifun_last_region_number == 0)
+ if (!ifun->eh->region_tree)
return 0;
- n_array = xcalloc (ifun_last_region_number + 1, sizeof (*n_array));
+ /* 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;
+
+ 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 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;
+
+ /* 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);
- for (i = 1; i <= ifun_last_region_number; ++i)
+ /* 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));
+
+ /* 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)
{
- struct eh_region *p = cur->inner;
- if (p)
- {
- while (p->next_peer)
- p = p->next_peer;
- p->next_peer = root;
- }
- 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;
+ 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 = cfun->eh->region_tree;
- 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
- cfun->eh->region_tree = root;
}
- free (n_array);
+ /* 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)
+ {
+ if (cur == NULL)
+ continue;
- i = cfun->eh->last_region_number;
- cfun->eh->last_region_number = i + ifun_last_region_number;
- return i;
+#define REMAP(REG) \
+ (REG) = VEC_index (eh_region, cfun->eh->region_array, \
+ (REG)->region_number + eh_offset)
+
+ switch (cur->type)
+ {
+ 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;
+ }
+
+#undef REMAP
+ }
+
+ return eh_offset;
}
-\f
-static int
-t2r_eq (pentry, pdata)
- const PTR pentry;
- const PTR pdata;
+/* 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)
{
- tree entry = (tree) pentry;
- tree data = (tree) pdata;
+ struct eh_region *rp_a, *rp_b;
- return TREE_PURPOSE (entry) == data;
+ 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);
+
+ return false;
}
-static hashval_t
-t2r_hash (pentry)
- const PTR pentry;
+/* 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)
{
- tree entry = (tree) pentry;
- return TYPE_HASH (TREE_PURPOSE (entry));
-}
+ 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_mark_1 (slot, data)
- PTR *slot;
- PTR data ATTRIBUTE_UNUSED;
+t2r_eq (const void *pentry, const void *pdata)
{
- tree contents = (tree) *slot;
- ggc_mark_tree (contents);
- return 1;
+ const_tree const entry = (const_tree) pentry;
+ const_tree const data = (const_tree) pdata;
+
+ return TREE_PURPOSE (entry) == data;
}
-static void
-t2r_mark (addr)
- PTR addr;
+static hashval_t
+t2r_hash (const void *pentry)
{
- htab_traverse (*(htab_t *)addr, t2r_mark_1, NULL);
+ const_tree const entry = (const_tree) pentry;
+ return TREE_HASH (TREE_PURPOSE (entry));
}
static void
-add_type_for_runtime (type)
- tree type;
+add_type_for_runtime (tree type)
{
tree *slot;
slot = (tree *) htab_find_slot_with_hash (type_to_runtime_map, type,
- TYPE_HASH (type), INSERT);
+ TREE_HASH (type), INSERT);
if (*slot == NULL)
{
tree runtime = (*lang_eh_runtime_type) (type);
*slot = tree_cons (type, runtime, NULL_TREE);
}
}
-
+
static tree
-lookup_type_for_runtime (type)
- tree type;
+lookup_type_for_runtime (tree type)
{
tree *slot;
slot = (tree *) htab_find_slot_with_hash (type_to_runtime_map, type,
- TYPE_HASH (type), NO_INSERT);
+ TREE_HASH (type), NO_INSERT);
- /* We should have always inserrted the data earlier. */
+ /* We should have always inserted the data earlier. */
return TREE_VALUE (*slot);
}
\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;
(a tree) for a @TTypes type node we are thinking about adding. */
static int
-ttypes_filter_eq (pentry, pdata)
- const PTR pentry;
- const PTR pdata;
+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;
}
static hashval_t
-ttypes_filter_hash (pentry)
- const PTR pentry;
+ttypes_filter_hash (const void *pentry)
{
const struct ttypes_filter *entry = (const struct ttypes_filter *) pentry;
- return TYPE_HASH (entry->t);
+ return TREE_HASH (entry->t);
}
/* Compare ENTRY with DATA (both struct ttypes_filter) for a @TTypes
should put these in some canonical order. */
static int
-ehspec_filter_eq (pentry, pdata)
- const PTR pentry;
- const PTR pdata;
+ehspec_filter_eq (const void *pentry, const void *pdata)
{
const struct ttypes_filter *entry = (const struct ttypes_filter *) pentry;
const struct ttypes_filter *data = (const struct ttypes_filter *) pdata;
/* Hash function for exception specification lists. */
static hashval_t
-ehspec_filter_hash (pentry)
- const PTR pentry;
+ehspec_filter_hash (const void *pentry)
{
const struct ttypes_filter *entry = (const struct ttypes_filter *) pentry;
hashval_t h = 0;
tree list;
for (list = entry->t; list ; list = TREE_CHAIN (list))
- h = (h << 5) + (h >> 27) + TYPE_HASH (TREE_VALUE (list));
+ h = (h << 5) + (h >> 27) + TREE_HASH (TREE_VALUE (list));
return h;
}
-/* Add TYPE to cfun->eh->ttype_data, using TYPES_HASH to speed
- up the search. Return the filter value to be used. */
+/* Add TYPE (which may be NULL) to cfun->eh->ttype_data, using TYPES_HASH
+ to speed up the search. Return the filter value to be used. */
static int
-add_ttypes_entry (ttypes_hash, type)
- htab_t ttypes_hash;
- tree type;
+add_ttypes_entry (htab_t ttypes_hash, tree type)
{
struct ttypes_filter **slot, *n;
slot = (struct ttypes_filter **)
- htab_find_slot_with_hash (ttypes_hash, type, TYPE_HASH (type), INSERT);
+ htab_find_slot_with_hash (ttypes_hash, type, TREE_HASH (type), INSERT);
if ((n = *slot) == NULL)
{
/* Filter value is a 1 based table index. */
- n = (struct ttypes_filter *) 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;
to speed up the search. Return the filter value to be used. */
static int
-add_ehspec_entry (ehspec_hash, ttypes_hash, list)
- htab_t ehspec_hash;
- htab_t ttypes_hash;
- tree list;
+add_ehspec_entry (htab_t ehspec_hash, htab_t ttypes_hash, tree list)
{
struct ttypes_filter **slot, *n;
struct ttypes_filter dummy;
{
/* Filter value is a -1 based byte index into a uleb128 buffer. */
- n = (struct ttypes_filter *) 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;
the same filter value, which saves table space. */
static void
-assign_filter_values ()
+assign_filter_values (void)
{
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);
-
- r->u.catch.filter_list
+ 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);
-
- r->u.catch.filter_list
+ 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);
}
-
+
break;
case ERT_ALLOWED_EXCEPTIONS:
htab_delete (ehspec);
}
+/* Emit SEQ into basic block just before INSN (that is assumed to be
+ first instruction of some existing BB and return the newly
+ produced block. */
+static basic_block
+emit_to_new_bb_before (rtx seq, rtx insn)
+{
+ rtx last;
+ basic_block bb;
+ edge e;
+ edge_iterator ei;
+
+ /* 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 (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 (BARRIER_P (last))
+ last = PREV_INSN (last);
+ bb = create_basic_block (seq, last, BLOCK_FOR_INSN (insn)->prev_bb);
+ update_bb_for_insn (bb);
+ bb->flags |= BB_SUPERBLOCK;
+ return bb;
+}
+
+/* Generate the code to actually handle exceptions, which will follow the
+ landing pads. */
+
static void
-build_post_landing_pads ()
+build_post_landing_pads (void)
{
int i;
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;
all the way up the chain until blocked by a cleanup. */
/* ??? Outer try regions can share landing pads with inner
try regions if the types are completely non-overlapping,
- and there are no interveaning cleanups. */
+ and there are no intervening cleanups. */
region->post_landing_pad = gen_label_rtx ();
struct eh_region *c;
for (c = region->u.try.catch; c ; c = c->u.catch.next_catch)
{
- /* ??? _Unwind_ForcedUnwind wants no match here. */
if (c->u.catch.type_list == NULL)
emit_jump (c->label);
else
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);
seq = get_insns ();
end_sequence ();
- emit_insns_before (seq, region->u.try.catch->label);
+ emit_to_new_bb_before (seq, region->u.try.catch->label);
+
break;
case ERT_ALLOWED_EXCEPTIONS:
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
seq = get_insns ();
end_sequence ();
- emit_insns_before (seq, region->label);
+ emit_to_new_bb_before (seq, region->label);
break;
case ERT_CLEANUP:
break;
default:
- abort ();
+ gcc_unreachable ();
}
}
}
_Unwind_Resume otherwise. */
static void
-connect_post_landing_pads ()
+connect_post_landing_pads (void)
{
int i;
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;
start_sequence ();
if (outer)
- emit_jump (outer->post_landing_pad);
+ {
+ edge e;
+ basic_block src, dest;
+
+ emit_jump (outer->post_landing_pad);
+ src = BLOCK_FOR_INSN (region->resume);
+ dest = BLOCK_FOR_INSN (outer->post_landing_pad);
+ 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, Pmode);
+ {
+ 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 ();
- emit_insns_before (seq, region->resume);
+ barrier = emit_insn_before (seq, region->resume);
+ /* Avoid duplicate barrier. */
+ 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);
}
}
\f
static void
-dw2_build_landing_pads ()
+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;
- bool clobbers_hard_regs = false;
+ basic_block bb;
+ 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 (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)));
+ gen_rtx_REG (targetm.eh_return_filter_mode (),
+ EH_RETURN_DATA_REGNO (1)));
seq = get_insns ();
end_sequence ();
- emit_insns_before (seq, region->post_landing_pad);
+ bb = emit_to_new_bb_before (seq, region->post_landing_pad);
+ e = make_edge (bb, bb->next_bb, EDGE_FALLTHRU);
+ e->count = bb->count;
+ e->probability = REG_BR_PROB_BASE;
}
}
};
static bool
-sjlj_find_directly_reachable_regions (lp_info)
- struct sjlj_lp_info *lp_info;
+sjlj_find_directly_reachable_regions (struct sjlj_lp_info *lp_info)
{
rtx insn;
bool found_one = false;
for (insn = get_insns (); insn ; insn = NEXT_INSN (insn))
{
struct eh_region *region;
+ enum reachable_code rc;
tree type_thrown;
rtx note;
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)
/* 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, NULL);
+ 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;
}
static void
-sjlj_assign_call_site_values (dispatch_label, lp_info)
- rtx dispatch_label;
- struct sjlj_lp_info *lp_info;
+sjlj_assign_call_site_values (rtx dispatch_label, struct sjlj_lp_info *lp_info)
{
htab_t ar_hash;
int i, index;
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)
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
}
static void
-sjlj_mark_call_sites (lp_info)
- struct sjlj_lp_info *lp_info;
+sjlj_mark_call_sites (struct sjlj_lp_info *lp_info)
{
int last_call_site = -2;
rtx insn, mem;
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)
- before = find_first_parameter_load (insn, NULL_RTX);
+ if (CALL_P (insn))
+ 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;
}
}
/* Construct the SjLj_Function_Context. */
static void
-sjlj_emit_function_enter (dispatch_label)
- rtx dispatch_label;
+sjlj_emit_function_enter (rtx dispatch_label)
{
rtx fn_begin, fc, mem, seq;
+ bool fn_begin_outside_block;
fc = cfun->eh->sjlj_fc;
if (cfun->uses_eh_lsda)
{
char buf[20];
- ASM_GENERATE_INTERNAL_LABEL (buf, "LLSDA", sjlj_funcdef_number);
- emit_move_insn (mem, gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (buf)));
+ rtx sym;
+
+ ASM_GENERATE_INTERNAL_LABEL (buf, "LLSDA", current_function_funcdef_no);
+ sym = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (buf));
+ SYMBOL_REF_FLAGS (sym) = SYMBOL_FLAG_LOCAL;
+ emit_move_insn (mem, sym);
}
else
emit_move_insn (mem, const0_rtx);
-
+
#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 (NULL, 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)
- break;
- emit_insns_after (seq, fn_begin);
+ if (NOTE_P (fn_begin))
+ {
+ if (NOTE_KIND (fn_begin) == NOTE_INSN_FUNCTION_BEG)
+ break;
+ 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
the call to unwind_sjlj_unregister_libfunc if needed. */
void
-sjlj_emit_function_exit_after (after)
- rtx after;
+sjlj_emit_function_exit_after (rtx after)
{
cfun->eh->sjlj_exit_after = after;
}
static void
-sjlj_emit_function_exit ()
+sjlj_emit_function_exit (void)
{
rtx seq;
+ edge e;
+ edge_iterator ei;
start_sequence ();
post-dominates all can_throw_internal instructions. This is
the last possible moment. */
- emit_insns_after (seq, cfun->eh->sjlj_exit_after);
+ FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR->preds)
+ if (e->flags & EDGE_FALLTHRU)
+ break;
+ if (e)
+ {
+ rtx insn;
+
+ /* 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. */
+ gcc_assert (e->src->next_bb == EXIT_BLOCK_PTR);
+ for (insn = BB_HEAD (e->src); ; insn = NEXT_INSN (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);
+ }
}
static void
-sjlj_emit_dispatch_table (dispatch_label, lp_info)
- rtx dispatch_label;
- struct sjlj_lp_info *lp_info;
+sjlj_emit_dispatch_table (rtx dispatch_label, struct sjlj_lp_info *lp_info)
{
int i, first_reachable;
rtx mem, dispatch, seq, fc;
+ rtx before;
+ basic_block bb;
+ edge e;
fc = cfun->eh->sjlj_fc;
start_sequence ();
emit_label (dispatch_label);
-
+
#ifndef DONT_USE_BUILTIN_SETJMP
expand_builtin_setjmp_receiver (dispatch_label);
#endif
dispatch = copy_to_reg (mem);
mem = adjust_address (fc, word_mode, sjlj_fc_data_ofs);
- if (word_mode != Pmode)
+ if (word_mode != ptr_mode)
{
#ifdef POINTERS_EXTEND_UNSIGNED
- mem = convert_memory_address (Pmode, mem);
+ mem = convert_memory_address (ptr_mode, mem);
#else
- mem = convert_to_mode (Pmode, mem, 0);
+ mem = convert_to_mode (ptr_mode, mem, 0);
#endif
}
emit_move_insn (cfun->eh->exc_ptr, mem);
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)
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 ();
- emit_insns_before (seq, (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);
+ e->count = bb->count;
+ e->probability = REG_BR_PROB_BASE;
}
static void
-sjlj_build_landing_pads ()
+sjlj_build_landing_pads (void)
{
struct sjlj_lp_info *lp_info;
- lp_info = (struct sjlj_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))
{
}
void
-finish_eh_generation ()
+finish_eh_generation (void)
{
+ basic_block bb;
+
/* Nothing to do if no regions created. */
if (cfun->eh->region_tree == NULL)
return;
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);
-
/* 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 ();
- rebuild_jump_labels (get_insns ());
- find_basic_blocks (get_insns (), max_reg_num (), 0);
- cleanup_cfg (CLEANUP_PRE_LOOP);
+ break_superblocks ();
+ 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;
+ edge_iterator ei;
+ bool eh = false;
+ for (ei = ei_start (bb->succs); (e = ei_safe_edge (ei)); )
+ {
+ if (e->flags & EDGE_EH)
+ {
+ remove_edge (e);
+ eh = true;
+ }
+ else
+ ei_next (&ei);
+ }
+ if (eh)
+ rtl_make_eh_edge (NULL, bb, BB_END (bb));
+ }
}
\f
+static hashval_t
+ehl_hash (const void *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;
+ return CODE_LABEL_NUMBER (entry->label) * scaled_golden_ratio;
+}
+
+static int
+ehl_eq (const void *pentry, const void *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;
+}
+
/* 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;
+remove_exception_handler_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);
+ gcc_assert (slot);
+
+ htab_clear_slot (cfun->eh->exception_handler_label_map, (void **) slot);
}
/* Splice REGION from the region tree etc. */
static void
-remove_eh_handler (region)
- struct eh_region *region;
+remove_eh_handler (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;
+ VEC_replace (eh_region, cfun->eh->region_array, region->region_number, outer);
+ if (region->aka)
+ {
+ 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_ior_into (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)
{
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;
remove_eh_handler (try);
}
}
-
- free (region);
}
/* LABEL heads a basic block that is about to be deleted. If this
delete the region. */
void
-maybe_remove_eh_handler (label)
- rtx label;
+maybe_remove_eh_handler (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 (void (*callback) (rtx))
+{
+ htab_traverse (cfun->eh->exception_handler_label_map, for_each_eh_label_1,
+ (void *) &callback);
+}
+
+static int
+for_each_eh_label_1 (void **pentry, void *data)
+{
+ struct ehl_map_entry *entry = *(struct ehl_map_entry **)pentry;
+ void (*callback) (rtx) = *(void (**) (rtx)) data;
+
+ (*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. */
{
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
base class of TYPE, is in HANDLED. */
static int
-check_handled (handled, type)
- tree handled, type;
+check_handled (tree handled, tree type)
{
tree t;
/* 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. */
static void
-add_reachable_handler (info, lp_region, region)
- 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.
+/* 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. */
static enum reachable_code
-reachable_next_level (region, type_thrown, info)
- struct eh_region *region;
- tree type_thrown;
- struct reachable_info *info;
+reachable_next_level (struct eh_region *region, tree type_thrown,
+ struct reachable_info *info)
{
switch (region->type)
{
for (c = region->u.try.catch; c ; c = c->u.catch.next_catch)
{
/* A catch-all handler ends the search. */
- /* ??? _Unwind_ForcedUnwind will want outer cleanups
- to be run as well. */
if (c->u.catch.type_list == NULL)
{
add_reachable_handler (info, region, c);
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. */
return RNL_MAYBE_CAUGHT;
case ERT_CATCH:
- /* Catch regions are handled by their controling try region. */
+ /* Catch regions are handled by their controlling try region. */
return RNL_NOT_CAUGHT;
case ERT_MUST_NOT_THROW:
/* 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_CAUGHT;
}
else
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 (insn)
- 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)
region = region->outer;
}
- for (; region; region = region->outer)
- if (reachable_next_level (region, type_thrown, &info) >= RNL_CAUGHT)
- break;
-
- return info.handlers;
+ while (region)
+ {
+ if (reachable_next_level (region, type_thrown, &info) >= RNL_CAUGHT)
+ break;
+ /* If we have processed one cleanup, there is no point in
+ processing any more of them. Each cleanup will have an edge
+ to the next outer cleanup region, so the flow graph will be
+ accurate. */
+ if (region->type == ERT_CLEANUP)
+ region = region->u.cleanup.prev_try;
+ else
+ region = region->outer;
+ }
}
-/* Determine if the given INSN can throw an exception that is caught
- within the function. */
+/* Retrieve a list of labels of exception handlers which can be
+ reached by a given insn. */
-bool
-can_throw_internal (insn)
- rtx insn;
+static void
+arh_to_landing_pad (struct eh_region *region, void *data)
{
- struct eh_region *region;
- tree type_thrown;
- rtx note;
+ rtx *p_handlers = data;
+ if (! *p_handlers)
+ *p_handlers = alloc_INSN_LIST (region->landing_pad, NULL_RTX);
+}
- if (! INSN_P (insn))
- return false;
+static void
+arh_to_label (struct eh_region *region, void *data)
+{
+ rtx *p_handlers = data;
+ *p_handlers = alloc_INSN_LIST (region->label, *p_handlers);
+}
- if (GET_CODE (insn) == INSN
- && GET_CODE (PATTERN (insn)) == SEQUENCE)
- insn = XVECEXP (PATTERN (insn), 0, 0);
+rtx
+reachable_handlers (rtx insn)
+{
+ bool is_resx = false;
+ rtx handlers = NULL;
+ int region_number;
- if (GET_CODE (insn) == CALL_INSN
- && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER)
+ if (JUMP_P (insn)
+ && GET_CODE (PATTERN (insn)) == RESX)
{
- 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;
+ 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));
}
- /* 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;
+ 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_1 (int region_number, bool is_resx)
+{
+ struct eh_region *region;
+ tree type_thrown;
- 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;
if (how == RNL_BLOCKED)
return false;
if (how != RNL_NOT_CAUGHT)
- return true;
+ return true;
}
return false;
}
-/* Determine if the given INSN can throw an exception that is
- visible outside the function. */
+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_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 (insn)
- rtx insn;
+can_throw_external (const_rtx insn)
{
- struct eh_region *region;
- tree type_thrown;
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);
}
-/* True if nothing in this function can throw outside this function. */
+/* Set TREE_NOTHROW and cfun->all_throwers_are_sibcalls. */
-bool
-nothrow_function_p ()
+unsigned int
+set_nothrow_function_flags (void)
{
rtx insn;
+ /* 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
+ 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 true;
+ return 0;
for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
if (can_throw_external (insn))
- return false;
+ {
+ TREE_NOTHROW (current_function_decl) = 0;
+
+ if (!CALL_P (insn) || !SIBLING_CALL_P (insn))
+ {
+ cfun->all_throwers_are_sibcalls = 0;
+ return 0;
+ }
+ }
+
for (insn = current_function_epilogue_delay_list; insn;
insn = XEXP (insn, 1))
if (can_throw_external (insn))
- return false;
+ {
+ TREE_NOTHROW (current_function_decl) = 0;
- return true;
+ if (!CALL_P (insn) || !SIBLING_CALL_P (insn))
+ {
+ cfun->all_throwers_are_sibcalls = 0;
+ 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. */
On the SPARC, this means flushing the register windows. */
void
-expand_builtin_unwind_init ()
+expand_builtin_unwind_init (void)
{
/* 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 (arglist)
- 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;
}
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,
return the actual address encoded in that value. */
rtx
-expand_builtin_extract_return_addr (addr_tree)
- tree addr_tree;
+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)
+ {
+#ifdef POINTERS_EXTEND_UNSIGNED
+ addr = convert_memory_address (Pmode, addr);
+#else
+ addr = convert_to_mode (Pmode, addr, 0);
+#endif
+ }
/* 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. */
stack slot so the epilogue will return to that address. */
rtx
-expand_builtin_frob_return_addr (addr_tree)
- tree addr_tree;
+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);
-#ifdef POINTERS_EXTEND_UNSIGNED
- if (GET_MODE (addr) != Pmode)
- addr = convert_memory_address (Pmode, addr);
-#endif
+ addr = convert_memory_address (Pmode, addr);
#ifdef RETURN_ADDR_OFFSET
addr = force_reg (Pmode, addr);
exception handler. */
void
-expand_builtin_eh_return (stackadj_tree, handler_tree)
- tree stackadj_tree, handler_tree;
-{
- rtx stackadj, handler;
-
- stackadj = expand_expr (stackadj_tree, cfun->eh->ehr_stackadj, VOIDmode, 0);
- handler = expand_expr (handler_tree, cfun->eh->ehr_handler, VOIDmode, 0);
-
-#ifdef POINTERS_EXTEND_UNSIGNED
- if (GET_MODE (stackadj) != Pmode)
- stackadj = convert_memory_address (Pmode, stackadj);
-
- if (GET_MODE (handler) != Pmode)
- handler = convert_memory_address (Pmode, handler);
+expand_builtin_eh_return (tree stackadj_tree ATTRIBUTE_UNUSED,
+ tree handler_tree)
+{
+ rtx tmp;
+
+#ifdef EH_RETURN_STACKADJ_RTX
+ 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);
+ else if (tmp != cfun->eh->ehr_stackadj)
+ emit_move_insn (cfun->eh->ehr_stackadj, tmp);
#endif
- if (! cfun->eh->ehr_label)
- {
- cfun->eh->ehr_stackadj = copy_to_reg (stackadj);
- cfun->eh->ehr_handler = copy_to_reg (handler);
- cfun->eh->ehr_label = gen_label_rtx ();
- }
- else
- {
- if (stackadj != cfun->eh->ehr_stackadj)
- emit_move_insn (cfun->eh->ehr_stackadj, stackadj);
- if (handler != cfun->eh->ehr_handler)
- emit_move_insn (cfun->eh->ehr_handler, handler);
- }
+ 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);
+ else if (tmp != cfun->eh->ehr_handler)
+ emit_move_insn (cfun->eh->ehr_handler, tmp);
+ if (!cfun->eh->ehr_label)
+ cfun->eh->ehr_label = gen_label_rtx ();
emit_jump (cfun->eh->ehr_label);
}
void
-expand_eh_return ()
+expand_eh_return (void)
{
- rtx sa, ra, around_label;
+ rtx around_label;
if (! cfun->eh->ehr_label)
return;
- sa = EH_RETURN_STACKADJ_RTX;
- if (! sa)
- {
- error ("__builtin_eh_return not supported on this target");
- return;
- }
-
current_function_calls_eh_return = 1;
+#ifdef EH_RETURN_STACKADJ_RTX
+ emit_move_insn (EH_RETURN_STACKADJ_RTX, const0_rtx);
+#endif
+
around_label = gen_label_rtx ();
- emit_move_insn (sa, const0_rtx);
emit_jump (around_label);
emit_label (cfun->eh->ehr_label);
clobber_return_register ();
+#ifdef EH_RETURN_STACKADJ_RTX
+ emit_move_insn (EH_RETURN_STACKADJ_RTX, cfun->eh->ehr_stackadj);
+#endif
+
#ifdef HAVE_eh_return
if (HAVE_eh_return)
- emit_insn (gen_eh_return (cfun->eh->ehr_stackadj, cfun->eh->ehr_handler));
+ emit_insn (gen_eh_return (cfun->eh->ehr_handler));
else
#endif
{
- ra = EH_RETURN_HANDLER_RTX;
- if (! ra)
- {
- error ("__builtin_eh_return not supported on this target");
- ra = gen_reg_rtx (Pmode);
- }
-
- emit_move_insn (sa, cfun->eh->ehr_stackadj);
- emit_move_insn (ra, cfun->eh->ehr_handler);
+#ifdef EH_RETURN_HANDLER_RTX
+ emit_move_insn (EH_RETURN_HANDLER_RTX, cfun->eh->ehr_handler);
+#else
+ error ("__builtin_eh_return not supported on this target");
+#endif
}
emit_label (around_label);
}
+
+/* Convert a ptr_mode address ADDR_TREE to a Pmode address controlled by
+ POINTERS_EXTEND_UNSIGNED and return it. */
+
+rtx
+expand_builtin_extend_pointer (tree addr_tree)
+{
+ rtx addr = expand_expr (addr_tree, NULL_RTX, ptr_mode, EXPAND_NORMAL);
+ int extend;
+
+#ifdef POINTERS_EXTEND_UNSIGNED
+ extend = POINTERS_EXTEND_UNSIGNED;
+#else
+ /* The previous EH code did an unsigned extend by default, so we do this also
+ for consistency. */
+ extend = 1;
+#endif
+
+ return convert_modes (word_mode, ptr_mode, addr, extend);
+}
\f
/* In the following functions, we represent entries in the action table
as 1-based indices. Special cases are:
};
static int
-action_record_eq (pentry, pdata)
- const PTR pentry;
- const PTR pdata;
+action_record_eq (const void *pentry, const void *pdata)
{
const struct action_record *entry = (const struct action_record *) pentry;
const struct action_record *data = (const struct action_record *) pdata;
}
static hashval_t
-action_record_hash (pentry)
- const PTR pentry;
+action_record_hash (const void *pentry)
{
const struct action_record *entry = (const struct action_record *) pentry;
return entry->next * 1009 + entry->filter;
}
static int
-add_action_record (ar_hash, filter, next)
- htab_t ar_hash;
- int filter, next;
+add_action_record (htab_t ar_hash, int filter, int next)
{
struct action_record **slot, *new, tmp;
if ((new = *slot) == NULL)
{
- new = (struct action_record *) xmalloc (sizeof (*new));
+ new = xmalloc (sizeof (*new));
new->offset = VARRAY_ACTIVE_SIZE (cfun->eh->action_record_data) + 1;
new->filter = filter;
new->next = next;
}
static int
-collect_one_action_chain (ar_hash, region)
- htab_t ar_hash;
- struct eh_region *region;
+collect_one_action_chain (htab_t ar_hash, struct eh_region *region)
{
struct eh_region *c;
int next;
/* Process the associated catch regions in reverse order.
If there's a catch-all handler, then we don't need to
search outer regions. Use a magic -3 value to record
- that we havn't done the outer search. */
+ that we haven't done the outer search. */
next = -3;
for (c = region->u.try.last_catch; c ; c = c->u.catch.prev_catch)
{
{
/* 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))
{
/* An exception specification adds its filter to the
beginning of the chain. */
next = collect_one_action_chain (ar_hash, region->outer);
- return add_action_record (ar_hash, region->u.allowed.filter,
- next < 0 ? 0 : next);
+
+ /* If there is no next action, terminate the chain. */
+ if (next == -1)
+ next = 0;
+ /* If all outer actions are cleanups or must_not_throw,
+ we'll have no action record for it, since we had wanted
+ to encode these states in the call-site record directly.
+ 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:
/* A must-not-throw region with no inner handlers or cleanups
return collect_one_action_chain (ar_hash, region->outer);
default:
- abort ();
+ gcc_unreachable ();
}
}
static int
-add_call_site (landing_pad, action)
- rtx landing_pad;
- int action;
+add_call_site (rtx landing_pad, int action)
{
struct call_site_record *data = cfun->eh->call_site_data;
int used = cfun->eh->call_site_data_used;
if (used >= size)
{
size = (size ? size * 2 : 64);
- data = (struct call_site_record *)
- xrealloc (data, sizeof (*data) * size);
+ data = ggc_realloc (data, sizeof (*data) * size);
cfun->eh->call_site_data = data;
cfun->eh->call_site_data_size = size;
}
The new note numbers will not refer to region numbers, but
instead to call site entries. */
-void
-convert_to_eh_region_ranges ()
+unsigned int
+convert_to_eh_region_ranges (void)
{
rtx insn, iter, note;
htab_t ar_hash;
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);
}
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;
}
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 (data_area, value)
- varray_type *data_area;
- unsigned int value;
+push_uleb128 (varray_type *data_area, unsigned int value)
{
do
{
}
static void
-push_sleb128 (data_area, value)
- varray_type *data_area;
- int value;
+push_sleb128 (varray_type *data_area, int value)
{
unsigned char byte;
int more;
\f
#ifndef HAVE_AS_LEB128
static int
-dw2_size_of_call_site_table ()
+dw2_size_of_call_site_table (void)
{
int n = cfun->eh->call_site_data_used;
int size = n * (4 + 4 + 4);
}
static int
-sjlj_size_of_call_site_table ()
+sjlj_size_of_call_site_table (void)
{
int n = cfun->eh->call_site_data_used;
int size = 0;
#endif
static void
-dw2_output_call_site_table ()
+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");
}
static void
-sjlj_output_call_site_table ()
+sjlj_output_call_site_table (void)
{
int n = cfun->eh->call_site_data_used;
int i;
call_site_base += n;
}
+#ifndef TARGET_UNWIND_INFO
+/* Switch to the section that should be used for exception tables. */
+
+static void
+switch_to_exception_section (const char * ARG_UNUSED (fnname))
+{
+ section *s;
+
+ if (exception_section)
+ s = exception_section;
+ else
+ {
+ /* Compute the section and cache it into exception_section,
+ unless it depends on the function name. */
+ if (targetm.have_named_sections)
+ {
+ int flags;
+
+ 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
+
+
+/* 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);
+ }
+
+ /* 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
+ dw2_asm_output_encoded_addr_rtx (tt_format, value, public, NULL);
+}
+
void
-output_function_exception_table ()
+output_function_exception_table (const char * ARG_UNUSED (fnname))
{
int tt_format, cs_format, lp_format, i, n;
#ifdef HAVE_AS_LEB128
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);
+ if (eh_personality_libfunc)
+ assemble_external_libcall (eh_personality_libfunc);
-#ifdef IA64_UNWIND_INFO
+#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. */
{
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);
+ targetm.asm_out.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);
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;
#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);
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)
- type = integer_zero_node;
- else
- type = lookup_type_for_runtime (type);
-
- value = expand_expr (type, NULL_RTX, VOIDmode, EXPAND_INITIALIZER);
- 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;
+}
- function_section (current_function_decl);
+htab_t
+get_eh_throw_stmt_table (struct function *fun)
+{
+ return fun->eh->throw_stmt_table;
+}
- if (USING_SJLJ_EXCEPTIONS)
- sjlj_funcdef_number += 1;
+/* 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);
+}
+
+/* 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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