3522 lines
96 KiB
C
3522 lines
96 KiB
C
/* Implements exception handling.
|
||
Copyright (C) 1989-2020 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 3, or (at your option) any later
|
||
version.
|
||
|
||
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
||
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
||
for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with GCC; see the file COPYING3. If not see
|
||
<http://www.gnu.org/licenses/>. */
|
||
|
||
|
||
/* An exception is an event that can be "thrown" from within a
|
||
function. This event can then be "caught" by the callers of
|
||
the function.
|
||
|
||
The representation of exceptions changes several times during
|
||
the compilation process:
|
||
|
||
In the beginning, in the front end, we have the GENERIC trees
|
||
TRY_CATCH_EXPR, TRY_FINALLY_EXPR, EH_ELSE_EXPR, WITH_CLEANUP_EXPR,
|
||
CLEANUP_POINT_EXPR, CATCH_EXPR, and EH_FILTER_EXPR.
|
||
|
||
During initial gimplification (gimplify.c) these are lowered to the
|
||
GIMPLE_TRY, GIMPLE_CATCH, GIMPLE_EH_ELSE, and GIMPLE_EH_FILTER
|
||
nodes. The WITH_CLEANUP_EXPR and CLEANUP_POINT_EXPR nodes are
|
||
converted into GIMPLE_TRY_FINALLY nodes; the others are a more
|
||
direct 1-1 conversion.
|
||
|
||
During pass_lower_eh (tree-eh.c) we record the nested structure
|
||
of the TRY nodes in EH_REGION nodes in CFUN->EH->REGION_TREE.
|
||
We expand the eh_protect_cleanup_actions langhook into MUST_NOT_THROW
|
||
regions at this time. We can then flatten the statements within
|
||
the TRY nodes to straight-line code. Statements that had been within
|
||
TRY nodes that can throw are recorded within CFUN->EH->THROW_STMT_TABLE,
|
||
so that we may remember what action is supposed to be taken if
|
||
a given statement does throw. During this lowering process,
|
||
we create an EH_LANDING_PAD node for each EH_REGION that has
|
||
some code within the function that needs to be executed if a
|
||
throw does happen. We also create RESX statements that are
|
||
used to transfer control from an inner EH_REGION to an outer
|
||
EH_REGION. We also create EH_DISPATCH statements as placeholders
|
||
for a runtime type comparison that should be made in order to
|
||
select the action to perform among different CATCH and EH_FILTER
|
||
regions.
|
||
|
||
During pass_lower_eh_dispatch (tree-eh.c), which is run after
|
||
all inlining is complete, we are able to run assign_filter_values,
|
||
which allows us to map the set of types manipulated by all of the
|
||
CATCH and EH_FILTER regions to a set of integers. This set of integers
|
||
will be how the exception runtime communicates with the code generated
|
||
within the function. We then expand the GIMPLE_EH_DISPATCH statements
|
||
to a switch or conditional branches that use the argument provided by
|
||
the runtime (__builtin_eh_filter) and the set of integers we computed
|
||
in assign_filter_values.
|
||
|
||
During pass_lower_resx (tree-eh.c), which is run near the end
|
||
of optimization, we expand RESX statements. If the eh region
|
||
that is outer to the RESX statement is a MUST_NOT_THROW, then
|
||
the RESX expands to some form of abort statement. If the eh
|
||
region that is outer to the RESX statement is within the current
|
||
function, then the RESX expands to a bookkeeping call
|
||
(__builtin_eh_copy_values) and a goto. Otherwise, the next
|
||
handler for the exception must be within a function somewhere
|
||
up the call chain, so we call back into the exception runtime
|
||
(__builtin_unwind_resume).
|
||
|
||
During pass_expand (cfgexpand.c), we generate REG_EH_REGION notes
|
||
that create an rtl to eh_region mapping that corresponds to the
|
||
gimple to eh_region mapping that had been recorded in the
|
||
THROW_STMT_TABLE.
|
||
|
||
Then, via finish_eh_generation, we generate the real landing pads
|
||
to which the runtime will actually transfer control. These new
|
||
landing pads perform whatever bookkeeping is needed by the target
|
||
backend in order to resume execution within the current function.
|
||
Each of these new landing pads falls through into the post_landing_pad
|
||
label which had been used within the CFG up to this point. All
|
||
exception edges within the CFG are redirected to the new landing pads.
|
||
If the target uses setjmp to implement exceptions, the various extra
|
||
calls into the runtime to register and unregister the current stack
|
||
frame are emitted at this time.
|
||
|
||
During pass_convert_to_eh_region_ranges (except.c), we transform
|
||
the REG_EH_REGION notes attached to individual insns into
|
||
non-overlapping ranges of insns bounded by NOTE_INSN_EH_REGION_BEG
|
||
and NOTE_INSN_EH_REGION_END. Each insn within such ranges has the
|
||
same associated action within the exception region tree, meaning
|
||
that (1) the exception is caught by the same landing pad within the
|
||
current function, (2) the exception is blocked by the runtime with
|
||
a MUST_NOT_THROW region, or (3) the exception is not handled at all
|
||
within the current function.
|
||
|
||
Finally, during assembly generation, we call
|
||
output_function_exception_table (except.c) to emit the tables with
|
||
which the exception runtime can determine if a given stack frame
|
||
handles a given exception, and if so what filter value to provide
|
||
to the function when the non-local control transfer is effected.
|
||
If the target uses dwarf2 unwinding to implement exceptions, then
|
||
output_call_frame_info (dwarf2out.c) emits the required unwind data. */
|
||
|
||
|
||
#include "config.h"
|
||
#include "system.h"
|
||
#include "coretypes.h"
|
||
#include "backend.h"
|
||
#include "target.h"
|
||
#include "rtl.h"
|
||
#include "tree.h"
|
||
#include "cfghooks.h"
|
||
#include "tree-pass.h"
|
||
#include "memmodel.h"
|
||
#include "tm_p.h"
|
||
#include "stringpool.h"
|
||
#include "expmed.h"
|
||
#include "optabs.h"
|
||
#include "emit-rtl.h"
|
||
#include "cgraph.h"
|
||
#include "diagnostic.h"
|
||
#include "fold-const.h"
|
||
#include "stor-layout.h"
|
||
#include "explow.h"
|
||
#include "stmt.h"
|
||
#include "expr.h"
|
||
#include "calls.h"
|
||
#include "libfuncs.h"
|
||
#include "except.h"
|
||
#include "output.h"
|
||
#include "dwarf2asm.h"
|
||
#include "dwarf2out.h"
|
||
#include "common/common-target.h"
|
||
#include "langhooks.h"
|
||
#include "cfgrtl.h"
|
||
#include "tree-pretty-print.h"
|
||
#include "cfgloop.h"
|
||
#include "builtins.h"
|
||
#include "tree-hash-traits.h"
|
||
|
||
static GTY(()) int call_site_base;
|
||
|
||
static GTY(()) hash_map<tree_hash, tree> *type_to_runtime_map;
|
||
|
||
static GTY(()) tree setjmp_fn;
|
||
|
||
/* Describe the SjLj_Function_Context structure. */
|
||
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_lsda_ofs;
|
||
static int sjlj_fc_jbuf_ofs;
|
||
|
||
|
||
struct GTY(()) call_site_record_d
|
||
{
|
||
rtx landing_pad;
|
||
int action;
|
||
};
|
||
|
||
/* In the following structure and associated functions,
|
||
we represent entries in the action table as 1-based indices.
|
||
Special cases are:
|
||
|
||
0: null action record, non-null landing pad; implies cleanups
|
||
-1: null action record, null landing pad; implies no action
|
||
-2: no call-site entry; implies must_not_throw
|
||
-3: we have yet to process outer regions
|
||
|
||
Further, no special cases apply to the "next" field of the record.
|
||
For next, 0 means end of list. */
|
||
|
||
struct action_record
|
||
{
|
||
int offset;
|
||
int filter;
|
||
int next;
|
||
};
|
||
|
||
/* Hashtable helpers. */
|
||
|
||
struct action_record_hasher : free_ptr_hash <action_record>
|
||
{
|
||
static inline hashval_t hash (const action_record *);
|
||
static inline bool equal (const action_record *, const action_record *);
|
||
};
|
||
|
||
inline hashval_t
|
||
action_record_hasher::hash (const action_record *entry)
|
||
{
|
||
return entry->next * 1009 + entry->filter;
|
||
}
|
||
|
||
inline bool
|
||
action_record_hasher::equal (const action_record *entry,
|
||
const action_record *data)
|
||
{
|
||
return entry->filter == data->filter && entry->next == data->next;
|
||
}
|
||
|
||
typedef hash_table<action_record_hasher> action_hash_type;
|
||
|
||
static bool get_eh_region_and_lp_from_rtx (const_rtx, eh_region *,
|
||
eh_landing_pad *);
|
||
|
||
static void dw2_build_landing_pads (void);
|
||
|
||
static int collect_one_action_chain (action_hash_type *, eh_region);
|
||
static int add_call_site (rtx, int, int);
|
||
|
||
static void push_uleb128 (vec<uchar, va_gc> **, unsigned int);
|
||
static void push_sleb128 (vec<uchar, va_gc> **, int);
|
||
static int dw2_size_of_call_site_table (int);
|
||
static int sjlj_size_of_call_site_table (void);
|
||
static void dw2_output_call_site_table (int, int);
|
||
static void sjlj_output_call_site_table (void);
|
||
|
||
|
||
void
|
||
init_eh (void)
|
||
{
|
||
if (! flag_exceptions)
|
||
return;
|
||
|
||
type_to_runtime_map = hash_map<tree_hash, tree>::create_ggc (31);
|
||
|
||
/* Create the SjLj_Function_Context structure. This should match
|
||
the definition in unwind-sjlj.c. */
|
||
if (targetm_common.except_unwind_info (&global_options) == UI_SJLJ)
|
||
{
|
||
tree f_jbuf, f_per, f_lsda, f_prev, f_cs, f_data, tmp;
|
||
|
||
sjlj_fc_type_node = lang_hooks.types.make_type (RECORD_TYPE);
|
||
|
||
f_prev = build_decl (BUILTINS_LOCATION,
|
||
FIELD_DECL, get_identifier ("__prev"),
|
||
build_pointer_type (sjlj_fc_type_node));
|
||
DECL_FIELD_CONTEXT (f_prev) = sjlj_fc_type_node;
|
||
|
||
f_cs = build_decl (BUILTINS_LOCATION,
|
||
FIELD_DECL, get_identifier ("__call_site"),
|
||
integer_type_node);
|
||
DECL_FIELD_CONTEXT (f_cs) = sjlj_fc_type_node;
|
||
|
||
tmp = build_index_type (size_int (4 - 1));
|
||
tmp = build_array_type (lang_hooks.types.type_for_mode
|
||
(targetm.unwind_word_mode (), 1),
|
||
tmp);
|
||
f_data = build_decl (BUILTINS_LOCATION,
|
||
FIELD_DECL, get_identifier ("__data"), tmp);
|
||
DECL_FIELD_CONTEXT (f_data) = sjlj_fc_type_node;
|
||
|
||
f_per = build_decl (BUILTINS_LOCATION,
|
||
FIELD_DECL, get_identifier ("__personality"),
|
||
ptr_type_node);
|
||
DECL_FIELD_CONTEXT (f_per) = sjlj_fc_type_node;
|
||
|
||
f_lsda = build_decl (BUILTINS_LOCATION,
|
||
FIELD_DECL, get_identifier ("__lsda"),
|
||
ptr_type_node);
|
||
DECL_FIELD_CONTEXT (f_lsda) = sjlj_fc_type_node;
|
||
|
||
#ifdef DONT_USE_BUILTIN_SETJMP
|
||
#ifdef JMP_BUF_SIZE
|
||
tmp = size_int (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 = size_int (FIRST_PSEUDO_REGISTER + 2 - 1);
|
||
#endif
|
||
#else
|
||
/* Compute a minimally sized jump buffer. We need room to store at
|
||
least 3 pointers - stack pointer, frame pointer and return address.
|
||
Plus for some targets we need room for an extra pointer - in the
|
||
case of MIPS this is the global pointer. This makes a total of four
|
||
pointers, but to be safe we actually allocate room for 5.
|
||
|
||
If pointers are smaller than words then we allocate enough room for
|
||
5 words, just in case the backend needs this much room. For more
|
||
discussion on this issue see:
|
||
http://gcc.gnu.org/ml/gcc-patches/2014-05/msg00313.html. */
|
||
if (POINTER_SIZE > BITS_PER_WORD)
|
||
tmp = size_int (5 - 1);
|
||
else
|
||
tmp = size_int ((5 * BITS_PER_WORD / POINTER_SIZE) - 1);
|
||
#endif
|
||
|
||
tmp = build_index_type (tmp);
|
||
tmp = build_array_type (ptr_type_node, tmp);
|
||
f_jbuf = build_decl (BUILTINS_LOCATION,
|
||
FIELD_DECL, get_identifier ("__jbuf"), tmp);
|
||
#ifdef DONT_USE_BUILTIN_SETJMP
|
||
/* We don't know what the alignment requirements of the
|
||
runtime's jmp_buf has. Overestimate. */
|
||
SET_DECL_ALIGN (f_jbuf, BIGGEST_ALIGNMENT);
|
||
DECL_USER_ALIGN (f_jbuf) = 1;
|
||
#endif
|
||
DECL_FIELD_CONTEXT (f_jbuf) = sjlj_fc_type_node;
|
||
|
||
TYPE_FIELDS (sjlj_fc_type_node) = f_prev;
|
||
TREE_CHAIN (f_prev) = f_cs;
|
||
TREE_CHAIN (f_cs) = f_data;
|
||
TREE_CHAIN (f_data) = f_per;
|
||
TREE_CHAIN (f_per) = f_lsda;
|
||
TREE_CHAIN (f_lsda) = f_jbuf;
|
||
|
||
layout_type (sjlj_fc_type_node);
|
||
|
||
/* Cache the interesting field offsets so that we have
|
||
easy access from rtl. */
|
||
sjlj_fc_call_site_ofs
|
||
= (tree_to_uhwi (DECL_FIELD_OFFSET (f_cs))
|
||
+ tree_to_uhwi (DECL_FIELD_BIT_OFFSET (f_cs)) / BITS_PER_UNIT);
|
||
sjlj_fc_data_ofs
|
||
= (tree_to_uhwi (DECL_FIELD_OFFSET (f_data))
|
||
+ tree_to_uhwi (DECL_FIELD_BIT_OFFSET (f_data)) / BITS_PER_UNIT);
|
||
sjlj_fc_personality_ofs
|
||
= (tree_to_uhwi (DECL_FIELD_OFFSET (f_per))
|
||
+ tree_to_uhwi (DECL_FIELD_BIT_OFFSET (f_per)) / BITS_PER_UNIT);
|
||
sjlj_fc_lsda_ofs
|
||
= (tree_to_uhwi (DECL_FIELD_OFFSET (f_lsda))
|
||
+ tree_to_uhwi (DECL_FIELD_BIT_OFFSET (f_lsda)) / BITS_PER_UNIT);
|
||
sjlj_fc_jbuf_ofs
|
||
= (tree_to_uhwi (DECL_FIELD_OFFSET (f_jbuf))
|
||
+ tree_to_uhwi (DECL_FIELD_BIT_OFFSET (f_jbuf)) / BITS_PER_UNIT);
|
||
|
||
#ifdef DONT_USE_BUILTIN_SETJMP
|
||
tmp = build_function_type_list (integer_type_node, TREE_TYPE (f_jbuf),
|
||
NULL);
|
||
setjmp_fn = build_decl (BUILTINS_LOCATION, FUNCTION_DECL,
|
||
get_identifier ("setjmp"), tmp);
|
||
TREE_PUBLIC (setjmp_fn) = 1;
|
||
DECL_EXTERNAL (setjmp_fn) = 1;
|
||
DECL_ASSEMBLER_NAME (setjmp_fn);
|
||
#endif
|
||
}
|
||
}
|
||
|
||
void
|
||
init_eh_for_function (void)
|
||
{
|
||
cfun->eh = ggc_cleared_alloc<eh_status> ();
|
||
|
||
/* Make sure zero'th entries are used. */
|
||
vec_safe_push (cfun->eh->region_array, (eh_region)0);
|
||
vec_safe_push (cfun->eh->lp_array, (eh_landing_pad)0);
|
||
}
|
||
|
||
/* Routines to generate the exception tree somewhat directly.
|
||
These are used from tree-eh.c when processing exception related
|
||
nodes during tree optimization. */
|
||
|
||
static eh_region
|
||
gen_eh_region (enum eh_region_type type, eh_region outer)
|
||
{
|
||
eh_region new_eh;
|
||
|
||
/* Insert a new blank region as a leaf in the tree. */
|
||
new_eh = ggc_cleared_alloc<eh_region_d> ();
|
||
new_eh->type = type;
|
||
new_eh->outer = outer;
|
||
if (outer)
|
||
{
|
||
new_eh->next_peer = outer->inner;
|
||
outer->inner = new_eh;
|
||
}
|
||
else
|
||
{
|
||
new_eh->next_peer = cfun->eh->region_tree;
|
||
cfun->eh->region_tree = new_eh;
|
||
}
|
||
|
||
new_eh->index = vec_safe_length (cfun->eh->region_array);
|
||
vec_safe_push (cfun->eh->region_array, new_eh);
|
||
|
||
/* Copy the language's notion of whether to use __cxa_end_cleanup. */
|
||
if (targetm.arm_eabi_unwinder && lang_hooks.eh_use_cxa_end_cleanup)
|
||
new_eh->use_cxa_end_cleanup = true;
|
||
|
||
return new_eh;
|
||
}
|
||
|
||
eh_region
|
||
gen_eh_region_cleanup (eh_region outer)
|
||
{
|
||
return gen_eh_region (ERT_CLEANUP, outer);
|
||
}
|
||
|
||
eh_region
|
||
gen_eh_region_try (eh_region outer)
|
||
{
|
||
return gen_eh_region (ERT_TRY, outer);
|
||
}
|
||
|
||
eh_catch
|
||
gen_eh_region_catch (eh_region t, tree type_or_list)
|
||
{
|
||
eh_catch c, l;
|
||
tree type_list, type_node;
|
||
|
||
gcc_assert (t->type == ERT_TRY);
|
||
|
||
/* 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)
|
||
{
|
||
if (TREE_CODE (type_or_list) != TREE_LIST)
|
||
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));
|
||
}
|
||
|
||
c = ggc_cleared_alloc<eh_catch_d> ();
|
||
c->type_list = type_list;
|
||
l = t->u.eh_try.last_catch;
|
||
c->prev_catch = l;
|
||
if (l)
|
||
l->next_catch = c;
|
||
else
|
||
t->u.eh_try.first_catch = c;
|
||
t->u.eh_try.last_catch = c;
|
||
|
||
return c;
|
||
}
|
||
|
||
eh_region
|
||
gen_eh_region_allowed (eh_region outer, tree allowed)
|
||
{
|
||
eh_region region = gen_eh_region (ERT_ALLOWED_EXCEPTIONS, outer);
|
||
region->u.allowed.type_list = allowed;
|
||
|
||
for (; allowed ; allowed = TREE_CHAIN (allowed))
|
||
add_type_for_runtime (TREE_VALUE (allowed));
|
||
|
||
return region;
|
||
}
|
||
|
||
eh_region
|
||
gen_eh_region_must_not_throw (eh_region outer)
|
||
{
|
||
return gen_eh_region (ERT_MUST_NOT_THROW, outer);
|
||
}
|
||
|
||
eh_landing_pad
|
||
gen_eh_landing_pad (eh_region region)
|
||
{
|
||
eh_landing_pad lp = ggc_cleared_alloc<eh_landing_pad_d> ();
|
||
|
||
lp->next_lp = region->landing_pads;
|
||
lp->region = region;
|
||
lp->index = vec_safe_length (cfun->eh->lp_array);
|
||
region->landing_pads = lp;
|
||
|
||
vec_safe_push (cfun->eh->lp_array, lp);
|
||
|
||
return lp;
|
||
}
|
||
|
||
eh_region
|
||
get_eh_region_from_number_fn (struct function *ifun, int i)
|
||
{
|
||
return (*ifun->eh->region_array)[i];
|
||
}
|
||
|
||
eh_region
|
||
get_eh_region_from_number (int i)
|
||
{
|
||
return get_eh_region_from_number_fn (cfun, i);
|
||
}
|
||
|
||
eh_landing_pad
|
||
get_eh_landing_pad_from_number_fn (struct function *ifun, int i)
|
||
{
|
||
return (*ifun->eh->lp_array)[i];
|
||
}
|
||
|
||
eh_landing_pad
|
||
get_eh_landing_pad_from_number (int i)
|
||
{
|
||
return get_eh_landing_pad_from_number_fn (cfun, i);
|
||
}
|
||
|
||
eh_region
|
||
get_eh_region_from_lp_number_fn (struct function *ifun, int i)
|
||
{
|
||
if (i < 0)
|
||
return (*ifun->eh->region_array)[-i];
|
||
else if (i == 0)
|
||
return NULL;
|
||
else
|
||
{
|
||
eh_landing_pad lp;
|
||
lp = (*ifun->eh->lp_array)[i];
|
||
return lp->region;
|
||
}
|
||
}
|
||
|
||
eh_region
|
||
get_eh_region_from_lp_number (int i)
|
||
{
|
||
return get_eh_region_from_lp_number_fn (cfun, i);
|
||
}
|
||
|
||
/* Returns true if the current function has exception handling regions. */
|
||
|
||
bool
|
||
current_function_has_exception_handlers (void)
|
||
{
|
||
return cfun->eh->region_tree != NULL;
|
||
}
|
||
|
||
/* A subroutine of duplicate_eh_regions. Copy the eh_region tree at OLD.
|
||
Root it at OUTER, and apply LP_OFFSET to the lp numbers. */
|
||
|
||
struct duplicate_eh_regions_data
|
||
{
|
||
duplicate_eh_regions_map label_map;
|
||
void *label_map_data;
|
||
hash_map<void *, void *> *eh_map;
|
||
};
|
||
|
||
static void
|
||
duplicate_eh_regions_1 (struct duplicate_eh_regions_data *data,
|
||
eh_region old_r, eh_region outer)
|
||
{
|
||
eh_landing_pad old_lp, new_lp;
|
||
eh_region new_r;
|
||
|
||
new_r = gen_eh_region (old_r->type, outer);
|
||
gcc_assert (!data->eh_map->put (old_r, new_r));
|
||
|
||
switch (old_r->type)
|
||
{
|
||
case ERT_CLEANUP:
|
||
break;
|
||
|
||
case ERT_TRY:
|
||
{
|
||
eh_catch oc, nc;
|
||
for (oc = old_r->u.eh_try.first_catch; oc ; oc = oc->next_catch)
|
||
{
|
||
/* We should be doing all our region duplication before and
|
||
during inlining, which is before filter lists are created. */
|
||
gcc_assert (oc->filter_list == NULL);
|
||
nc = gen_eh_region_catch (new_r, oc->type_list);
|
||
nc->label = data->label_map (oc->label, data->label_map_data);
|
||
}
|
||
}
|
||
break;
|
||
|
||
case ERT_ALLOWED_EXCEPTIONS:
|
||
new_r->u.allowed.type_list = old_r->u.allowed.type_list;
|
||
if (old_r->u.allowed.label)
|
||
new_r->u.allowed.label
|
||
= data->label_map (old_r->u.allowed.label, data->label_map_data);
|
||
else
|
||
new_r->u.allowed.label = NULL_TREE;
|
||
break;
|
||
|
||
case ERT_MUST_NOT_THROW:
|
||
new_r->u.must_not_throw.failure_loc =
|
||
LOCATION_LOCUS (old_r->u.must_not_throw.failure_loc);
|
||
new_r->u.must_not_throw.failure_decl =
|
||
old_r->u.must_not_throw.failure_decl;
|
||
break;
|
||
}
|
||
|
||
for (old_lp = old_r->landing_pads; old_lp ; old_lp = old_lp->next_lp)
|
||
{
|
||
/* Don't bother copying unused landing pads. */
|
||
if (old_lp->post_landing_pad == NULL)
|
||
continue;
|
||
|
||
new_lp = gen_eh_landing_pad (new_r);
|
||
gcc_assert (!data->eh_map->put (old_lp, new_lp));
|
||
|
||
new_lp->post_landing_pad
|
||
= data->label_map (old_lp->post_landing_pad, data->label_map_data);
|
||
EH_LANDING_PAD_NR (new_lp->post_landing_pad) = new_lp->index;
|
||
}
|
||
|
||
/* Make sure to preserve the original use of __cxa_end_cleanup. */
|
||
new_r->use_cxa_end_cleanup = old_r->use_cxa_end_cleanup;
|
||
|
||
for (old_r = old_r->inner; old_r ; old_r = old_r->next_peer)
|
||
duplicate_eh_regions_1 (data, old_r, new_r);
|
||
}
|
||
|
||
/* Duplicate the EH regions from IFUN rooted at COPY_REGION into
|
||
the current function and root the tree below OUTER_REGION.
|
||
The special case of COPY_REGION of NULL means all regions.
|
||
Remap labels using MAP/MAP_DATA callback. Return a pointer map
|
||
that allows the caller to remap uses of both EH regions and
|
||
EH landing pads. */
|
||
|
||
hash_map<void *, void *> *
|
||
duplicate_eh_regions (struct function *ifun,
|
||
eh_region copy_region, int outer_lp,
|
||
duplicate_eh_regions_map map, void *map_data)
|
||
{
|
||
struct duplicate_eh_regions_data data;
|
||
eh_region outer_region;
|
||
|
||
if (flag_checking)
|
||
verify_eh_tree (ifun);
|
||
|
||
data.label_map = map;
|
||
data.label_map_data = map_data;
|
||
data.eh_map = new hash_map<void *, void *>;
|
||
|
||
outer_region = get_eh_region_from_lp_number_fn (cfun, outer_lp);
|
||
|
||
/* Copy all the regions in the subtree. */
|
||
if (copy_region)
|
||
duplicate_eh_regions_1 (&data, copy_region, outer_region);
|
||
else
|
||
{
|
||
eh_region r;
|
||
for (r = ifun->eh->region_tree; r ; r = r->next_peer)
|
||
duplicate_eh_regions_1 (&data, r, outer_region);
|
||
}
|
||
|
||
if (flag_checking)
|
||
verify_eh_tree (cfun);
|
||
|
||
return data.eh_map;
|
||
}
|
||
|
||
/* Return the region that is outer to both REGION_A and REGION_B in IFUN. */
|
||
|
||
eh_region
|
||
eh_region_outermost (struct function *ifun, eh_region region_a,
|
||
eh_region region_b)
|
||
{
|
||
gcc_assert (ifun->eh->region_array);
|
||
gcc_assert (ifun->eh->region_tree);
|
||
|
||
auto_sbitmap b_outer (ifun->eh->region_array->length ());
|
||
bitmap_clear (b_outer);
|
||
|
||
do
|
||
{
|
||
bitmap_set_bit (b_outer, region_b->index);
|
||
region_b = region_b->outer;
|
||
}
|
||
while (region_b);
|
||
|
||
do
|
||
{
|
||
if (bitmap_bit_p (b_outer, region_a->index))
|
||
break;
|
||
region_a = region_a->outer;
|
||
}
|
||
while (region_a);
|
||
|
||
return region_a;
|
||
}
|
||
|
||
void
|
||
add_type_for_runtime (tree type)
|
||
{
|
||
/* If TYPE is NOP_EXPR, it means that it already is a runtime type. */
|
||
if (TREE_CODE (type) == NOP_EXPR)
|
||
return;
|
||
|
||
bool existed = false;
|
||
tree *slot = &type_to_runtime_map->get_or_insert (type, &existed);
|
||
if (!existed)
|
||
*slot = lang_hooks.eh_runtime_type (type);
|
||
}
|
||
|
||
tree
|
||
lookup_type_for_runtime (tree type)
|
||
{
|
||
/* If TYPE is NOP_EXPR, it means that it already is a runtime type. */
|
||
if (TREE_CODE (type) == NOP_EXPR)
|
||
return type;
|
||
|
||
/* We should have always inserted the data earlier. */
|
||
return *type_to_runtime_map->get (type);
|
||
}
|
||
|
||
|
||
/* Represent an entry in @TTypes for either catch actions
|
||
or exception filter actions. */
|
||
struct ttypes_filter {
|
||
tree t;
|
||
int filter;
|
||
};
|
||
|
||
/* Helper for ttypes_filter hashing. */
|
||
|
||
struct ttypes_filter_hasher : free_ptr_hash <ttypes_filter>
|
||
{
|
||
typedef tree_node *compare_type;
|
||
static inline hashval_t hash (const ttypes_filter *);
|
||
static inline bool equal (const ttypes_filter *, const tree_node *);
|
||
};
|
||
|
||
/* Compare ENTRY (a ttypes_filter entry in the hash table) with DATA
|
||
(a tree) for a @TTypes type node we are thinking about adding. */
|
||
|
||
inline bool
|
||
ttypes_filter_hasher::equal (const ttypes_filter *entry, const tree_node *data)
|
||
{
|
||
return entry->t == data;
|
||
}
|
||
|
||
inline hashval_t
|
||
ttypes_filter_hasher::hash (const ttypes_filter *entry)
|
||
{
|
||
return TREE_HASH (entry->t);
|
||
}
|
||
|
||
typedef hash_table<ttypes_filter_hasher> ttypes_hash_type;
|
||
|
||
|
||
/* Helper for ehspec hashing. */
|
||
|
||
struct ehspec_hasher : free_ptr_hash <ttypes_filter>
|
||
{
|
||
static inline hashval_t hash (const ttypes_filter *);
|
||
static inline bool equal (const ttypes_filter *, const ttypes_filter *);
|
||
};
|
||
|
||
/* Compare ENTRY with DATA (both struct ttypes_filter) for a @TTypes
|
||
exception specification list we are thinking about adding. */
|
||
/* ??? Currently we use the type lists in the order given. Someone
|
||
should put these in some canonical order. */
|
||
|
||
inline bool
|
||
ehspec_hasher::equal (const ttypes_filter *entry, const ttypes_filter *data)
|
||
{
|
||
return type_list_equal (entry->t, data->t);
|
||
}
|
||
|
||
/* Hash function for exception specification lists. */
|
||
|
||
inline hashval_t
|
||
ehspec_hasher::hash (const ttypes_filter *entry)
|
||
{
|
||
hashval_t h = 0;
|
||
tree list;
|
||
|
||
for (list = entry->t; list ; list = TREE_CHAIN (list))
|
||
h = (h << 5) + (h >> 27) + TREE_HASH (TREE_VALUE (list));
|
||
return h;
|
||
}
|
||
|
||
typedef hash_table<ehspec_hasher> ehspec_hash_type;
|
||
|
||
|
||
/* 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 *ttypes_hash, tree type)
|
||
{
|
||
struct ttypes_filter **slot, *n;
|
||
|
||
slot = ttypes_hash->find_slot_with_hash (type, (hashval_t) TREE_HASH (type),
|
||
INSERT);
|
||
|
||
if ((n = *slot) == NULL)
|
||
{
|
||
/* Filter value is a 1 based table index. */
|
||
|
||
n = XNEW (struct ttypes_filter);
|
||
n->t = type;
|
||
n->filter = vec_safe_length (cfun->eh->ttype_data) + 1;
|
||
*slot = n;
|
||
|
||
vec_safe_push (cfun->eh->ttype_data, type);
|
||
}
|
||
|
||
return n->filter;
|
||
}
|
||
|
||
/* Add LIST to cfun->eh->ehspec_data, using EHSPEC_HASH and TYPES_HASH
|
||
to speed up the search. Return the filter value to be used. */
|
||
|
||
static int
|
||
add_ehspec_entry (ehspec_hash_type *ehspec_hash, ttypes_hash_type *ttypes_hash,
|
||
tree list)
|
||
{
|
||
struct ttypes_filter **slot, *n;
|
||
struct ttypes_filter dummy;
|
||
|
||
dummy.t = list;
|
||
slot = ehspec_hash->find_slot (&dummy, INSERT);
|
||
|
||
if ((n = *slot) == NULL)
|
||
{
|
||
int len;
|
||
|
||
if (targetm.arm_eabi_unwinder)
|
||
len = vec_safe_length (cfun->eh->ehspec_data.arm_eabi);
|
||
else
|
||
len = vec_safe_length (cfun->eh->ehspec_data.other);
|
||
|
||
/* Filter value is a -1 based byte index into a uleb128 buffer. */
|
||
|
||
n = XNEW (struct ttypes_filter);
|
||
n->t = list;
|
||
n->filter = -(len + 1);
|
||
*slot = n;
|
||
|
||
/* Generate a 0 terminated list of filter values. */
|
||
for (; list ; list = TREE_CHAIN (list))
|
||
{
|
||
if (targetm.arm_eabi_unwinder)
|
||
vec_safe_push (cfun->eh->ehspec_data.arm_eabi, 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.other,
|
||
add_ttypes_entry (ttypes_hash, TREE_VALUE (list)));
|
||
}
|
||
}
|
||
if (targetm.arm_eabi_unwinder)
|
||
vec_safe_push (cfun->eh->ehspec_data.arm_eabi, NULL_TREE);
|
||
else
|
||
vec_safe_push (cfun->eh->ehspec_data.other, (uchar)0);
|
||
}
|
||
|
||
return n->filter;
|
||
}
|
||
|
||
/* Generate the action filter values to be used for CATCH and
|
||
ALLOWED_EXCEPTIONS regions. When using dwarf2 exception regions,
|
||
we use lots of landing pads, and so every type or list can share
|
||
the same filter value, which saves table space. */
|
||
|
||
void
|
||
assign_filter_values (void)
|
||
{
|
||
int i;
|
||
eh_region r;
|
||
eh_catch c;
|
||
|
||
vec_alloc (cfun->eh->ttype_data, 16);
|
||
if (targetm.arm_eabi_unwinder)
|
||
vec_alloc (cfun->eh->ehspec_data.arm_eabi, 64);
|
||
else
|
||
vec_alloc (cfun->eh->ehspec_data.other, 64);
|
||
|
||
ehspec_hash_type ehspec (31);
|
||
ttypes_hash_type ttypes (31);
|
||
|
||
for (i = 1; vec_safe_iterate (cfun->eh->region_array, i, &r); ++i)
|
||
{
|
||
if (r == NULL)
|
||
continue;
|
||
|
||
switch (r->type)
|
||
{
|
||
case ERT_TRY:
|
||
for (c = r->u.eh_try.first_catch; c ; c = c->next_catch)
|
||
{
|
||
/* Whatever type_list is (NULL or true list), we build a list
|
||
of filters for the region. */
|
||
c->filter_list = NULL_TREE;
|
||
|
||
if (c->type_list != NULL)
|
||
{
|
||
/* Get a filter value for each of the types caught and store
|
||
them in the region's dedicated list. */
|
||
tree tp_node = c->type_list;
|
||
|
||
for ( ; tp_node; tp_node = TREE_CHAIN (tp_node))
|
||
{
|
||
int flt
|
||
= add_ttypes_entry (&ttypes, TREE_VALUE (tp_node));
|
||
tree flt_node = build_int_cst (integer_type_node, flt);
|
||
|
||
c->filter_list
|
||
= tree_cons (NULL_TREE, flt_node, c->filter_list);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* 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_cst (integer_type_node, flt);
|
||
|
||
c->filter_list
|
||
= tree_cons (NULL_TREE, flt_node, NULL);
|
||
}
|
||
}
|
||
break;
|
||
|
||
case ERT_ALLOWED_EXCEPTIONS:
|
||
r->u.allowed.filter
|
||
= add_ehspec_entry (&ehspec, &ttypes, r->u.allowed.type_list);
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* 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_insn *seq, rtx_insn *insn)
|
||
{
|
||
rtx_insn *next, *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);
|
||
|
||
/* Make sure to put the location of INSN or a subsequent instruction on SEQ
|
||
to avoid inheriting the location of the previous instruction. */
|
||
next = insn;
|
||
while (next && !NONDEBUG_INSN_P (next))
|
||
next = NEXT_INSN (next);
|
||
if (next)
|
||
last = emit_insn_before_setloc (seq, insn, INSN_LOCATION (next));
|
||
else
|
||
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;
|
||
}
|
||
|
||
/* A subroutine of dw2_build_landing_pads, also used for edge splitting
|
||
at the rtl level. Emit the code required by the target at a landing
|
||
pad for the given region. */
|
||
|
||
static void
|
||
expand_dw2_landing_pad_for_region (eh_region region)
|
||
{
|
||
if (targetm.have_exception_receiver ())
|
||
emit_insn (targetm.gen_exception_receiver ());
|
||
else if (targetm.have_nonlocal_goto_receiver ())
|
||
emit_insn (targetm.gen_nonlocal_goto_receiver ());
|
||
else
|
||
{ /* Nothing */ }
|
||
|
||
if (region->exc_ptr_reg)
|
||
emit_move_insn (region->exc_ptr_reg,
|
||
gen_rtx_REG (ptr_mode, EH_RETURN_DATA_REGNO (0)));
|
||
if (region->filter_reg)
|
||
emit_move_insn (region->filter_reg,
|
||
gen_rtx_REG (targetm.eh_return_filter_mode (),
|
||
EH_RETURN_DATA_REGNO (1)));
|
||
}
|
||
|
||
/* Expand the extra code needed at landing pads for dwarf2 unwinding. */
|
||
|
||
static void
|
||
dw2_build_landing_pads (void)
|
||
{
|
||
int i;
|
||
eh_landing_pad lp;
|
||
int e_flags = EDGE_FALLTHRU;
|
||
|
||
/* If we're going to partition blocks, we need to be able to add
|
||
new landing pads later, which means that we need to hold on to
|
||
the post-landing-pad block. Prevent it from being merged away.
|
||
We'll remove this bit after partitioning. */
|
||
if (flag_reorder_blocks_and_partition)
|
||
e_flags |= EDGE_PRESERVE;
|
||
|
||
for (i = 1; vec_safe_iterate (cfun->eh->lp_array, i, &lp); ++i)
|
||
{
|
||
basic_block bb;
|
||
rtx_insn *seq;
|
||
|
||
if (lp == NULL || lp->post_landing_pad == NULL)
|
||
continue;
|
||
|
||
start_sequence ();
|
||
|
||
lp->landing_pad = gen_label_rtx ();
|
||
emit_label (lp->landing_pad);
|
||
LABEL_PRESERVE_P (lp->landing_pad) = 1;
|
||
|
||
expand_dw2_landing_pad_for_region (lp->region);
|
||
|
||
seq = get_insns ();
|
||
end_sequence ();
|
||
|
||
bb = emit_to_new_bb_before (seq, label_rtx (lp->post_landing_pad));
|
||
bb->count = bb->next_bb->count;
|
||
make_single_succ_edge (bb, bb->next_bb, e_flags);
|
||
if (current_loops)
|
||
{
|
||
class loop *loop = bb->next_bb->loop_father;
|
||
/* If we created a pre-header block, add the new block to the
|
||
outer loop, otherwise to the loop itself. */
|
||
if (bb->next_bb == loop->header)
|
||
add_bb_to_loop (bb, loop_outer (loop));
|
||
else
|
||
add_bb_to_loop (bb, loop);
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
static vec<int> sjlj_lp_call_site_index;
|
||
|
||
/* Process all active landing pads. Assign each one a compact dispatch
|
||
index, and a call-site index. */
|
||
|
||
static int
|
||
sjlj_assign_call_site_values (void)
|
||
{
|
||
action_hash_type ar_hash (31);
|
||
int i, disp_index;
|
||
eh_landing_pad lp;
|
||
|
||
vec_alloc (crtl->eh.action_record_data, 64);
|
||
|
||
disp_index = 0;
|
||
call_site_base = 1;
|
||
for (i = 1; vec_safe_iterate (cfun->eh->lp_array, i, &lp); ++i)
|
||
if (lp && lp->post_landing_pad)
|
||
{
|
||
int action, call_site;
|
||
|
||
/* First: build the action table. */
|
||
action = collect_one_action_chain (&ar_hash, lp->region);
|
||
|
||
/* Next: assign call-site values. If dwarf2 terms, this would be
|
||
the region number assigned by convert_to_eh_region_ranges, but
|
||
handles no-action and must-not-throw differently. */
|
||
/* Map must-not-throw to otherwise unused call-site index 0. */
|
||
if (action == -2)
|
||
call_site = 0;
|
||
/* Map no-action to otherwise unused call-site index -1. */
|
||
else if (action == -1)
|
||
call_site = -1;
|
||
/* Otherwise, look it up in the table. */
|
||
else
|
||
call_site = add_call_site (GEN_INT (disp_index), action, 0);
|
||
sjlj_lp_call_site_index[i] = call_site;
|
||
|
||
disp_index++;
|
||
}
|
||
|
||
return disp_index;
|
||
}
|
||
|
||
/* Emit code to record the current call-site index before every
|
||
insn that can throw. */
|
||
|
||
static void
|
||
sjlj_mark_call_sites (void)
|
||
{
|
||
int last_call_site = -2;
|
||
rtx_insn *insn;
|
||
rtx mem;
|
||
|
||
for (insn = get_insns (); insn ; insn = NEXT_INSN (insn))
|
||
{
|
||
eh_landing_pad lp;
|
||
eh_region r;
|
||
bool nothrow;
|
||
int this_call_site;
|
||
rtx_insn *before, *p;
|
||
|
||
/* Reset value tracking at extended basic block boundaries. */
|
||
if (LABEL_P (insn))
|
||
last_call_site = -2;
|
||
|
||
/* If the function allocates dynamic stack space, the context must
|
||
be updated after every allocation/deallocation accordingly. */
|
||
if (NOTE_P (insn) && NOTE_KIND (insn) == NOTE_INSN_UPDATE_SJLJ_CONTEXT)
|
||
{
|
||
rtx buf_addr;
|
||
|
||
start_sequence ();
|
||
buf_addr = plus_constant (Pmode, XEXP (crtl->eh.sjlj_fc, 0),
|
||
sjlj_fc_jbuf_ofs);
|
||
expand_builtin_update_setjmp_buf (buf_addr);
|
||
p = get_insns ();
|
||
end_sequence ();
|
||
emit_insn_before (p, insn);
|
||
}
|
||
|
||
if (! INSN_P (insn))
|
||
continue;
|
||
|
||
nothrow = get_eh_region_and_lp_from_rtx (insn, &r, &lp);
|
||
if (nothrow)
|
||
continue;
|
||
if (lp)
|
||
this_call_site = sjlj_lp_call_site_index[lp->index];
|
||
else if (r == NULL)
|
||
{
|
||
/* Calls (and trapping insns) without notes are outside any
|
||
exception handling region in this function. Mark them as
|
||
no action. */
|
||
this_call_site = -1;
|
||
}
|
||
else
|
||
{
|
||
gcc_assert (r->type == ERT_MUST_NOT_THROW);
|
||
this_call_site = 0;
|
||
}
|
||
|
||
if (this_call_site != -1)
|
||
crtl->uses_eh_lsda = 1;
|
||
|
||
if (this_call_site == last_call_site)
|
||
continue;
|
||
|
||
/* Don't separate a call from it's argument loads. */
|
||
before = insn;
|
||
if (CALL_P (insn))
|
||
before = find_first_parameter_load (insn, NULL);
|
||
|
||
start_sequence ();
|
||
mem = adjust_address (crtl->eh.sjlj_fc, TYPE_MODE (integer_type_node),
|
||
sjlj_fc_call_site_ofs);
|
||
emit_move_insn (mem, gen_int_mode (this_call_site, GET_MODE (mem)));
|
||
p = get_insns ();
|
||
end_sequence ();
|
||
|
||
emit_insn_before (p, before);
|
||
last_call_site = this_call_site;
|
||
}
|
||
}
|
||
|
||
/* Construct the SjLj_Function_Context. */
|
||
|
||
static void
|
||
sjlj_emit_function_enter (rtx_code_label *dispatch_label)
|
||
{
|
||
rtx_insn *fn_begin, *seq;
|
||
rtx fc, mem;
|
||
bool fn_begin_outside_block;
|
||
rtx personality = get_personality_function (current_function_decl);
|
||
|
||
fc = crtl->eh.sjlj_fc;
|
||
|
||
start_sequence ();
|
||
|
||
/* We're storing this libcall's address into memory instead of
|
||
calling it directly. Thus, we must call assemble_external_libcall
|
||
here, as we cannot depend on emit_library_call to do it for us. */
|
||
assemble_external_libcall (personality);
|
||
mem = adjust_address (fc, Pmode, sjlj_fc_personality_ofs);
|
||
emit_move_insn (mem, personality);
|
||
|
||
mem = adjust_address (fc, Pmode, sjlj_fc_lsda_ofs);
|
||
if (crtl->uses_eh_lsda)
|
||
{
|
||
char buf[20];
|
||
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);
|
||
|
||
if (dispatch_label)
|
||
{
|
||
rtx addr = plus_constant (Pmode, XEXP (fc, 0), sjlj_fc_jbuf_ofs);
|
||
|
||
#ifdef DONT_USE_BUILTIN_SETJMP
|
||
addr = copy_addr_to_reg (addr);
|
||
addr = convert_memory_address (ptr_mode, addr);
|
||
tree addr_tree = make_tree (ptr_type_node, addr);
|
||
|
||
tree call_expr = build_call_expr (setjmp_fn, 1, addr_tree);
|
||
rtx x = expand_call (call_expr, NULL_RTX, false);
|
||
|
||
emit_cmp_and_jump_insns (x, const0_rtx, NE, 0,
|
||
TYPE_MODE (integer_type_node), 0,
|
||
dispatch_label,
|
||
profile_probability::unlikely ());
|
||
#else
|
||
expand_builtin_setjmp_setup (addr, dispatch_label);
|
||
#endif
|
||
}
|
||
|
||
emit_library_call (unwind_sjlj_register_libfunc, LCT_NORMAL, VOIDmode,
|
||
XEXP (fc, 0), Pmode);
|
||
|
||
seq = get_insns ();
|
||
end_sequence ();
|
||
|
||
/* ??? Instead of doing this at the beginning of the function,
|
||
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 (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;
|
||
}
|
||
|
||
#ifdef DONT_USE_BUILTIN_SETJMP
|
||
if (dispatch_label)
|
||
{
|
||
/* The sequence contains a branch in the middle so we need to force
|
||
the creation of a new basic block by means of BB_SUPERBLOCK. */
|
||
if (fn_begin_outside_block)
|
||
{
|
||
basic_block bb
|
||
= split_edge (single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun)));
|
||
if (JUMP_P (BB_END (bb)))
|
||
emit_insn_before (seq, BB_END (bb));
|
||
else
|
||
emit_insn_after (seq, BB_END (bb));
|
||
}
|
||
else
|
||
emit_insn_after (seq, fn_begin);
|
||
|
||
single_succ (ENTRY_BLOCK_PTR_FOR_FN (cfun))->flags |= BB_SUPERBLOCK;
|
||
return;
|
||
}
|
||
#endif
|
||
|
||
if (fn_begin_outside_block)
|
||
insert_insn_on_edge (seq, single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun)));
|
||
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 (rtx_insn *after)
|
||
{
|
||
crtl->eh.sjlj_exit_after = after;
|
||
}
|
||
|
||
static void
|
||
sjlj_emit_function_exit (void)
|
||
{
|
||
rtx_insn *seq, *insn;
|
||
|
||
start_sequence ();
|
||
|
||
emit_library_call (unwind_sjlj_unregister_libfunc, LCT_NORMAL, VOIDmode,
|
||
XEXP (crtl->eh.sjlj_fc, 0), Pmode);
|
||
|
||
seq = get_insns ();
|
||
end_sequence ();
|
||
|
||
/* ??? Really this can be done in any block at loop level 0 that
|
||
post-dominates all can_throw_internal instructions. This is
|
||
the last possible moment. */
|
||
|
||
insn = crtl->eh.sjlj_exit_after;
|
||
if (LABEL_P (insn))
|
||
insn = NEXT_INSN (insn);
|
||
|
||
emit_insn_after (seq, insn);
|
||
}
|
||
|
||
static void
|
||
sjlj_emit_dispatch_table (rtx_code_label *dispatch_label, int num_dispatch)
|
||
{
|
||
scalar_int_mode unwind_word_mode = targetm.unwind_word_mode ();
|
||
scalar_int_mode filter_mode = targetm.eh_return_filter_mode ();
|
||
eh_landing_pad lp;
|
||
rtx mem, fc, exc_ptr_reg, filter_reg;
|
||
rtx_insn *seq;
|
||
basic_block bb;
|
||
eh_region r;
|
||
int i, disp_index;
|
||
vec<tree> dispatch_labels = vNULL;
|
||
|
||
fc = crtl->eh.sjlj_fc;
|
||
|
||
start_sequence ();
|
||
|
||
emit_label (dispatch_label);
|
||
|
||
#ifndef DONT_USE_BUILTIN_SETJMP
|
||
expand_builtin_setjmp_receiver (dispatch_label);
|
||
|
||
/* The caller of expand_builtin_setjmp_receiver is responsible for
|
||
making sure that the label doesn't vanish. The only other caller
|
||
is the expander for __builtin_setjmp_receiver, which places this
|
||
label on the nonlocal_goto_label list. Since we're modeling these
|
||
CFG edges more exactly, we can use the forced_labels list instead. */
|
||
LABEL_PRESERVE_P (dispatch_label) = 1;
|
||
vec_safe_push<rtx_insn *> (forced_labels, dispatch_label);
|
||
#endif
|
||
|
||
/* Load up exc_ptr and filter values from the function context. */
|
||
mem = adjust_address (fc, unwind_word_mode, sjlj_fc_data_ofs);
|
||
if (unwind_word_mode != ptr_mode)
|
||
{
|
||
#ifdef POINTERS_EXTEND_UNSIGNED
|
||
mem = convert_memory_address (ptr_mode, mem);
|
||
#else
|
||
mem = convert_to_mode (ptr_mode, mem, 0);
|
||
#endif
|
||
}
|
||
exc_ptr_reg = force_reg (ptr_mode, mem);
|
||
|
||
mem = adjust_address (fc, unwind_word_mode,
|
||
sjlj_fc_data_ofs + GET_MODE_SIZE (unwind_word_mode));
|
||
if (unwind_word_mode != filter_mode)
|
||
mem = convert_to_mode (filter_mode, mem, 0);
|
||
filter_reg = force_reg (filter_mode, mem);
|
||
|
||
/* Jump to one of the directly reachable regions. */
|
||
|
||
disp_index = 0;
|
||
rtx_code_label *first_reachable_label = NULL;
|
||
|
||
/* If there's exactly one call site in the function, don't bother
|
||
generating a switch statement. */
|
||
if (num_dispatch > 1)
|
||
dispatch_labels.create (num_dispatch);
|
||
|
||
for (i = 1; vec_safe_iterate (cfun->eh->lp_array, i, &lp); ++i)
|
||
if (lp && lp->post_landing_pad)
|
||
{
|
||
rtx_insn *seq2;
|
||
rtx_code_label *label;
|
||
|
||
start_sequence ();
|
||
|
||
lp->landing_pad = dispatch_label;
|
||
|
||
if (num_dispatch > 1)
|
||
{
|
||
tree t_label, case_elt, t;
|
||
|
||
t_label = create_artificial_label (UNKNOWN_LOCATION);
|
||
t = build_int_cst (integer_type_node, disp_index);
|
||
case_elt = build_case_label (t, NULL, t_label);
|
||
dispatch_labels.quick_push (case_elt);
|
||
label = jump_target_rtx (t_label);
|
||
}
|
||
else
|
||
label = gen_label_rtx ();
|
||
|
||
if (disp_index == 0)
|
||
first_reachable_label = label;
|
||
emit_label (label);
|
||
|
||
r = lp->region;
|
||
if (r->exc_ptr_reg)
|
||
emit_move_insn (r->exc_ptr_reg, exc_ptr_reg);
|
||
if (r->filter_reg)
|
||
emit_move_insn (r->filter_reg, filter_reg);
|
||
|
||
seq2 = get_insns ();
|
||
end_sequence ();
|
||
|
||
rtx_insn *before = label_rtx (lp->post_landing_pad);
|
||
bb = emit_to_new_bb_before (seq2, before);
|
||
make_single_succ_edge (bb, bb->next_bb, EDGE_FALLTHRU);
|
||
if (current_loops)
|
||
{
|
||
class loop *loop = bb->next_bb->loop_father;
|
||
/* If we created a pre-header block, add the new block to the
|
||
outer loop, otherwise to the loop itself. */
|
||
if (bb->next_bb == loop->header)
|
||
add_bb_to_loop (bb, loop_outer (loop));
|
||
else
|
||
add_bb_to_loop (bb, loop);
|
||
/* ??? For multiple dispatches we will end up with edges
|
||
from the loop tree root into this loop, making it a
|
||
multiple-entry loop. Discard all affected loops. */
|
||
if (num_dispatch > 1)
|
||
{
|
||
for (loop = bb->loop_father;
|
||
loop_outer (loop); loop = loop_outer (loop))
|
||
mark_loop_for_removal (loop);
|
||
}
|
||
}
|
||
|
||
disp_index++;
|
||
}
|
||
gcc_assert (disp_index == num_dispatch);
|
||
|
||
if (num_dispatch > 1)
|
||
{
|
||
rtx disp = adjust_address (fc, TYPE_MODE (integer_type_node),
|
||
sjlj_fc_call_site_ofs);
|
||
expand_sjlj_dispatch_table (disp, dispatch_labels);
|
||
}
|
||
|
||
seq = get_insns ();
|
||
end_sequence ();
|
||
|
||
bb = emit_to_new_bb_before (seq, first_reachable_label);
|
||
if (num_dispatch == 1)
|
||
{
|
||
make_single_succ_edge (bb, bb->next_bb, EDGE_FALLTHRU);
|
||
if (current_loops)
|
||
{
|
||
class loop *loop = bb->next_bb->loop_father;
|
||
/* If we created a pre-header block, add the new block to the
|
||
outer loop, otherwise to the loop itself. */
|
||
if (bb->next_bb == loop->header)
|
||
add_bb_to_loop (bb, loop_outer (loop));
|
||
else
|
||
add_bb_to_loop (bb, loop);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* We are not wiring up edges here, but as the dispatcher call
|
||
is at function begin simply associate the block with the
|
||
outermost (non-)loop. */
|
||
if (current_loops)
|
||
add_bb_to_loop (bb, current_loops->tree_root);
|
||
}
|
||
}
|
||
|
||
static void
|
||
sjlj_build_landing_pads (void)
|
||
{
|
||
int num_dispatch;
|
||
|
||
num_dispatch = vec_safe_length (cfun->eh->lp_array);
|
||
if (num_dispatch == 0)
|
||
return;
|
||
sjlj_lp_call_site_index.safe_grow_cleared (num_dispatch);
|
||
|
||
num_dispatch = sjlj_assign_call_site_values ();
|
||
if (num_dispatch > 0)
|
||
{
|
||
rtx_code_label *dispatch_label = gen_label_rtx ();
|
||
int align = STACK_SLOT_ALIGNMENT (sjlj_fc_type_node,
|
||
TYPE_MODE (sjlj_fc_type_node),
|
||
TYPE_ALIGN (sjlj_fc_type_node));
|
||
crtl->eh.sjlj_fc
|
||
= assign_stack_local (TYPE_MODE (sjlj_fc_type_node),
|
||
int_size_in_bytes (sjlj_fc_type_node),
|
||
align);
|
||
|
||
sjlj_mark_call_sites ();
|
||
sjlj_emit_function_enter (dispatch_label);
|
||
sjlj_emit_dispatch_table (dispatch_label, num_dispatch);
|
||
sjlj_emit_function_exit ();
|
||
}
|
||
|
||
/* If we do not have any landing pads, we may still need to register a
|
||
personality routine and (empty) LSDA to handle must-not-throw regions. */
|
||
else if (function_needs_eh_personality (cfun) != eh_personality_none)
|
||
{
|
||
int align = STACK_SLOT_ALIGNMENT (sjlj_fc_type_node,
|
||
TYPE_MODE (sjlj_fc_type_node),
|
||
TYPE_ALIGN (sjlj_fc_type_node));
|
||
crtl->eh.sjlj_fc
|
||
= assign_stack_local (TYPE_MODE (sjlj_fc_type_node),
|
||
int_size_in_bytes (sjlj_fc_type_node),
|
||
align);
|
||
|
||
sjlj_mark_call_sites ();
|
||
sjlj_emit_function_enter (NULL);
|
||
sjlj_emit_function_exit ();
|
||
}
|
||
|
||
sjlj_lp_call_site_index.release ();
|
||
}
|
||
|
||
/* Update the sjlj function context. This function should be called
|
||
whenever we allocate or deallocate dynamic stack space. */
|
||
|
||
void
|
||
update_sjlj_context (void)
|
||
{
|
||
if (!flag_exceptions)
|
||
return;
|
||
|
||
emit_note (NOTE_INSN_UPDATE_SJLJ_CONTEXT);
|
||
}
|
||
|
||
/* After initial rtl generation, call back to finish generating
|
||
exception support code. */
|
||
|
||
void
|
||
finish_eh_generation (void)
|
||
{
|
||
basic_block bb;
|
||
|
||
/* Construct the landing pads. */
|
||
if (targetm_common.except_unwind_info (&global_options) == UI_SJLJ)
|
||
sjlj_build_landing_pads ();
|
||
else
|
||
dw2_build_landing_pads ();
|
||
|
||
break_superblocks ();
|
||
|
||
/* Redirect all EH edges from the post_landing_pad to the landing pad. */
|
||
FOR_EACH_BB_FN (bb, cfun)
|
||
{
|
||
eh_landing_pad lp;
|
||
edge_iterator ei;
|
||
edge e;
|
||
|
||
lp = get_eh_landing_pad_from_rtx (BB_END (bb));
|
||
|
||
FOR_EACH_EDGE (e, ei, bb->succs)
|
||
if (e->flags & EDGE_EH)
|
||
break;
|
||
|
||
/* We should not have generated any new throwing insns during this
|
||
pass, and we should not have lost any EH edges, so we only need
|
||
to handle two cases here:
|
||
(1) reachable handler and an existing edge to post-landing-pad,
|
||
(2) no reachable handler and no edge. */
|
||
gcc_assert ((lp != NULL) == (e != NULL));
|
||
if (lp != NULL)
|
||
{
|
||
gcc_assert (BB_HEAD (e->dest) == label_rtx (lp->post_landing_pad));
|
||
|
||
redirect_edge_succ (e, BLOCK_FOR_INSN (lp->landing_pad));
|
||
e->flags |= (CALL_P (BB_END (bb))
|
||
? EDGE_ABNORMAL | EDGE_ABNORMAL_CALL
|
||
: EDGE_ABNORMAL);
|
||
}
|
||
}
|
||
|
||
if (targetm_common.except_unwind_info (&global_options) == UI_SJLJ
|
||
/* Kludge for Alpha (see alpha_gp_save_rtx). */
|
||
|| single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun))->insns.r)
|
||
commit_edge_insertions ();
|
||
}
|
||
|
||
/* This section handles removing dead code for flow. */
|
||
|
||
void
|
||
remove_eh_landing_pad (eh_landing_pad lp)
|
||
{
|
||
eh_landing_pad *pp;
|
||
|
||
for (pp = &lp->region->landing_pads; *pp != lp; pp = &(*pp)->next_lp)
|
||
continue;
|
||
*pp = lp->next_lp;
|
||
|
||
if (lp->post_landing_pad)
|
||
EH_LANDING_PAD_NR (lp->post_landing_pad) = 0;
|
||
(*cfun->eh->lp_array)[lp->index] = NULL;
|
||
}
|
||
|
||
/* Splice the EH region at PP from the region tree. */
|
||
|
||
static void
|
||
remove_eh_handler_splicer (eh_region *pp)
|
||
{
|
||
eh_region region = *pp;
|
||
eh_landing_pad lp;
|
||
|
||
for (lp = region->landing_pads; lp ; lp = lp->next_lp)
|
||
{
|
||
if (lp->post_landing_pad)
|
||
EH_LANDING_PAD_NR (lp->post_landing_pad) = 0;
|
||
(*cfun->eh->lp_array)[lp->index] = NULL;
|
||
}
|
||
|
||
if (region->inner)
|
||
{
|
||
eh_region p, outer;
|
||
outer = region->outer;
|
||
|
||
*pp = p = region->inner;
|
||
do
|
||
{
|
||
p->outer = outer;
|
||
pp = &p->next_peer;
|
||
p = *pp;
|
||
}
|
||
while (p);
|
||
}
|
||
*pp = region->next_peer;
|
||
|
||
(*cfun->eh->region_array)[region->index] = NULL;
|
||
}
|
||
|
||
/* Splice a single EH region REGION from the region tree.
|
||
|
||
To unlink REGION, we need to find the pointer to it with a relatively
|
||
expensive search in REGION's outer region. If you are going to
|
||
remove a number of handlers, using remove_unreachable_eh_regions may
|
||
be a better option. */
|
||
|
||
void
|
||
remove_eh_handler (eh_region region)
|
||
{
|
||
eh_region *pp, *pp_start, p, outer;
|
||
|
||
outer = region->outer;
|
||
if (outer)
|
||
pp_start = &outer->inner;
|
||
else
|
||
pp_start = &cfun->eh->region_tree;
|
||
for (pp = pp_start, p = *pp; p != region; pp = &p->next_peer, p = *pp)
|
||
continue;
|
||
|
||
remove_eh_handler_splicer (pp);
|
||
}
|
||
|
||
/* Worker for remove_unreachable_eh_regions.
|
||
PP is a pointer to the region to start a region tree depth-first
|
||
search from. R_REACHABLE is the set of regions that have to be
|
||
preserved. */
|
||
|
||
static void
|
||
remove_unreachable_eh_regions_worker (eh_region *pp, sbitmap r_reachable)
|
||
{
|
||
while (*pp)
|
||
{
|
||
eh_region region = *pp;
|
||
remove_unreachable_eh_regions_worker (®ion->inner, r_reachable);
|
||
if (!bitmap_bit_p (r_reachable, region->index))
|
||
remove_eh_handler_splicer (pp);
|
||
else
|
||
pp = ®ion->next_peer;
|
||
}
|
||
}
|
||
|
||
/* Splice all EH regions *not* marked in R_REACHABLE from the region tree.
|
||
Do this by traversing the EH tree top-down and splice out regions that
|
||
are not marked. By removing regions from the leaves, we avoid costly
|
||
searches in the region tree. */
|
||
|
||
void
|
||
remove_unreachable_eh_regions (sbitmap r_reachable)
|
||
{
|
||
remove_unreachable_eh_regions_worker (&cfun->eh->region_tree, r_reachable);
|
||
}
|
||
|
||
/* Invokes CALLBACK for every exception handler landing pad label.
|
||
Only used by reload hackery; should not be used by new code. */
|
||
|
||
void
|
||
for_each_eh_label (void (*callback) (rtx))
|
||
{
|
||
eh_landing_pad lp;
|
||
int i;
|
||
|
||
for (i = 1; vec_safe_iterate (cfun->eh->lp_array, i, &lp); ++i)
|
||
{
|
||
if (lp)
|
||
{
|
||
rtx_code_label *lab = lp->landing_pad;
|
||
if (lab && LABEL_P (lab))
|
||
(*callback) (lab);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Create the REG_EH_REGION note for INSN, given its ECF_FLAGS for a
|
||
call insn.
|
||
|
||
At the gimple level, we use LP_NR
|
||
> 0 : The statement transfers to landing pad LP_NR
|
||
= 0 : The statement is outside any EH region
|
||
< 0 : The statement is within MUST_NOT_THROW region -LP_NR.
|
||
|
||
At the rtl level, we use LP_NR
|
||
> 0 : The insn transfers to landing pad LP_NR
|
||
= 0 : The insn cannot throw
|
||
< 0 : The insn is within MUST_NOT_THROW region -LP_NR
|
||
= INT_MIN : The insn cannot throw or execute a nonlocal-goto.
|
||
missing note: The insn is outside any EH region.
|
||
|
||
??? This difference probably ought to be avoided. We could stand
|
||
to record nothrow for arbitrary gimple statements, and so avoid
|
||
some moderately complex lookups in stmt_could_throw_p. Perhaps
|
||
NOTHROW should be mapped on both sides to INT_MIN. Perhaps the
|
||
no-nonlocal-goto property should be recorded elsewhere as a bit
|
||
on the call_insn directly. Perhaps we should make more use of
|
||
attaching the trees to call_insns (reachable via symbol_ref in
|
||
direct call cases) and just pull the data out of the trees. */
|
||
|
||
void
|
||
make_reg_eh_region_note (rtx_insn *insn, int ecf_flags, int lp_nr)
|
||
{
|
||
rtx value;
|
||
if (ecf_flags & ECF_NOTHROW)
|
||
value = const0_rtx;
|
||
else if (lp_nr != 0)
|
||
value = GEN_INT (lp_nr);
|
||
else
|
||
return;
|
||
add_reg_note (insn, REG_EH_REGION, value);
|
||
}
|
||
|
||
/* Create a REG_EH_REGION note for a CALL_INSN that cannot throw
|
||
nor perform a non-local goto. Replace the region note if it
|
||
already exists. */
|
||
|
||
void
|
||
make_reg_eh_region_note_nothrow_nononlocal (rtx_insn *insn)
|
||
{
|
||
rtx note = find_reg_note (insn, REG_EH_REGION, NULL_RTX);
|
||
rtx intmin = GEN_INT (INT_MIN);
|
||
|
||
if (note != 0)
|
||
XEXP (note, 0) = intmin;
|
||
else
|
||
add_reg_note (insn, REG_EH_REGION, intmin);
|
||
}
|
||
|
||
/* Return true if INSN could throw, assuming no REG_EH_REGION note
|
||
to the contrary. */
|
||
|
||
bool
|
||
insn_could_throw_p (const_rtx insn)
|
||
{
|
||
if (!flag_exceptions)
|
||
return false;
|
||
if (CALL_P (insn))
|
||
return true;
|
||
if (INSN_P (insn) && cfun->can_throw_non_call_exceptions)
|
||
return may_trap_p (PATTERN (insn));
|
||
return false;
|
||
}
|
||
|
||
/* Copy an REG_EH_REGION note to each insn that might throw beginning
|
||
at FIRST and ending at LAST. NOTE_OR_INSN is either the source insn
|
||
to look for a note, or the note itself. */
|
||
|
||
void
|
||
copy_reg_eh_region_note_forward (rtx note_or_insn, rtx_insn *first, rtx last)
|
||
{
|
||
rtx_insn *insn;
|
||
rtx note = note_or_insn;
|
||
|
||
if (INSN_P (note_or_insn))
|
||
{
|
||
note = find_reg_note (note_or_insn, REG_EH_REGION, NULL_RTX);
|
||
if (note == NULL)
|
||
return;
|
||
}
|
||
else if (is_a <rtx_insn *> (note_or_insn))
|
||
return;
|
||
note = XEXP (note, 0);
|
||
|
||
for (insn = first; insn != last ; insn = NEXT_INSN (insn))
|
||
if (!find_reg_note (insn, REG_EH_REGION, NULL_RTX)
|
||
&& insn_could_throw_p (insn))
|
||
add_reg_note (insn, REG_EH_REGION, note);
|
||
}
|
||
|
||
/* Likewise, but iterate backward. */
|
||
|
||
void
|
||
copy_reg_eh_region_note_backward (rtx note_or_insn, rtx_insn *last, rtx first)
|
||
{
|
||
rtx_insn *insn;
|
||
rtx note = note_or_insn;
|
||
|
||
if (INSN_P (note_or_insn))
|
||
{
|
||
note = find_reg_note (note_or_insn, REG_EH_REGION, NULL_RTX);
|
||
if (note == NULL)
|
||
return;
|
||
}
|
||
else if (is_a <rtx_insn *> (note_or_insn))
|
||
return;
|
||
note = XEXP (note, 0);
|
||
|
||
for (insn = last; insn != first; insn = PREV_INSN (insn))
|
||
if (insn_could_throw_p (insn))
|
||
add_reg_note (insn, REG_EH_REGION, note);
|
||
}
|
||
|
||
|
||
/* Extract all EH information from INSN. Return true if the insn
|
||
was marked NOTHROW. */
|
||
|
||
static bool
|
||
get_eh_region_and_lp_from_rtx (const_rtx insn, eh_region *pr,
|
||
eh_landing_pad *plp)
|
||
{
|
||
eh_landing_pad lp = NULL;
|
||
eh_region r = NULL;
|
||
bool ret = false;
|
||
rtx note;
|
||
int lp_nr;
|
||
|
||
if (! INSN_P (insn))
|
||
goto egress;
|
||
|
||
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)
|
||
{
|
||
ret = !insn_could_throw_p (insn);
|
||
goto egress;
|
||
}
|
||
|
||
lp_nr = INTVAL (XEXP (note, 0));
|
||
if (lp_nr == 0 || lp_nr == INT_MIN)
|
||
{
|
||
ret = true;
|
||
goto egress;
|
||
}
|
||
|
||
if (lp_nr < 0)
|
||
r = (*cfun->eh->region_array)[-lp_nr];
|
||
else
|
||
{
|
||
lp = (*cfun->eh->lp_array)[lp_nr];
|
||
r = lp->region;
|
||
}
|
||
|
||
egress:
|
||
*plp = lp;
|
||
*pr = r;
|
||
return ret;
|
||
}
|
||
|
||
/* Return the landing pad to which INSN may go, or NULL if it does not
|
||
have a reachable landing pad within this function. */
|
||
|
||
eh_landing_pad
|
||
get_eh_landing_pad_from_rtx (const_rtx insn)
|
||
{
|
||
eh_landing_pad lp;
|
||
eh_region r;
|
||
|
||
get_eh_region_and_lp_from_rtx (insn, &r, &lp);
|
||
return lp;
|
||
}
|
||
|
||
/* Return the region to which INSN may go, or NULL if it does not
|
||
have a reachable region within this function. */
|
||
|
||
eh_region
|
||
get_eh_region_from_rtx (const_rtx insn)
|
||
{
|
||
eh_landing_pad lp;
|
||
eh_region r;
|
||
|
||
get_eh_region_and_lp_from_rtx (insn, &r, &lp);
|
||
return r;
|
||
}
|
||
|
||
/* Return true if INSN throws and is caught by something in this function. */
|
||
|
||
bool
|
||
can_throw_internal (const_rtx insn)
|
||
{
|
||
return get_eh_landing_pad_from_rtx (insn) != NULL;
|
||
}
|
||
|
||
/* Return true if INSN throws and escapes from the current function. */
|
||
|
||
bool
|
||
can_throw_external (const_rtx insn)
|
||
{
|
||
eh_landing_pad lp;
|
||
eh_region r;
|
||
bool nothrow;
|
||
|
||
if (! INSN_P (insn))
|
||
return false;
|
||
|
||
if (NONJUMP_INSN_P (insn)
|
||
&& GET_CODE (PATTERN (insn)) == SEQUENCE)
|
||
{
|
||
rtx_sequence *seq = as_a <rtx_sequence *> (PATTERN (insn));
|
||
int i, n = seq->len ();
|
||
|
||
for (i = 0; i < n; i++)
|
||
if (can_throw_external (seq->element (i)))
|
||
return true;
|
||
|
||
return false;
|
||
}
|
||
|
||
nothrow = get_eh_region_and_lp_from_rtx (insn, &r, &lp);
|
||
|
||
/* If we can't throw, we obviously can't throw external. */
|
||
if (nothrow)
|
||
return false;
|
||
|
||
/* If we have an internal landing pad, then we're not external. */
|
||
if (lp != NULL)
|
||
return false;
|
||
|
||
/* If we're not within an EH region, then we are external. */
|
||
if (r == NULL)
|
||
return true;
|
||
|
||
/* The only thing that ought to be left is MUST_NOT_THROW regions,
|
||
which don't always have landing pads. */
|
||
gcc_assert (r->type == ERT_MUST_NOT_THROW);
|
||
return false;
|
||
}
|
||
|
||
/* Return true if INSN cannot throw at all. */
|
||
|
||
bool
|
||
insn_nothrow_p (const_rtx insn)
|
||
{
|
||
eh_landing_pad lp;
|
||
eh_region r;
|
||
|
||
if (! INSN_P (insn))
|
||
return true;
|
||
|
||
if (NONJUMP_INSN_P (insn)
|
||
&& GET_CODE (PATTERN (insn)) == SEQUENCE)
|
||
{
|
||
rtx_sequence *seq = as_a <rtx_sequence *> (PATTERN (insn));
|
||
int i, n = seq->len ();
|
||
|
||
for (i = 0; i < n; i++)
|
||
if (!insn_nothrow_p (seq->element (i)))
|
||
return false;
|
||
|
||
return true;
|
||
}
|
||
|
||
return get_eh_region_and_lp_from_rtx (insn, &r, &lp);
|
||
}
|
||
|
||
/* Return true if INSN can perform a non-local goto. */
|
||
/* ??? This test is here in this file because it (ab)uses REG_EH_REGION. */
|
||
|
||
bool
|
||
can_nonlocal_goto (const rtx_insn *insn)
|
||
{
|
||
if (nonlocal_goto_handler_labels && CALL_P (insn))
|
||
{
|
||
rtx note = find_reg_note (insn, REG_EH_REGION, NULL_RTX);
|
||
if (!note || INTVAL (XEXP (note, 0)) != INT_MIN)
|
||
return true;
|
||
}
|
||
return false;
|
||
}
|
||
|
||
/* Set TREE_NOTHROW and crtl->all_throwers_are_sibcalls. */
|
||
|
||
static unsigned int
|
||
set_nothrow_function_flags (void)
|
||
{
|
||
rtx_insn *insn;
|
||
|
||
crtl->nothrow = 1;
|
||
|
||
/* Assume crtl->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. */
|
||
|
||
crtl->all_throwers_are_sibcalls = 1;
|
||
|
||
/* If we don't know that this implementation of the function will
|
||
actually be used, then we must not set TREE_NOTHROW, since
|
||
callers must not assume that this function does not throw. */
|
||
if (TREE_NOTHROW (current_function_decl))
|
||
return 0;
|
||
|
||
if (! flag_exceptions)
|
||
return 0;
|
||
|
||
for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
|
||
if (can_throw_external (insn))
|
||
{
|
||
crtl->nothrow = 0;
|
||
|
||
if (!CALL_P (insn) || !SIBLING_CALL_P (insn))
|
||
{
|
||
crtl->all_throwers_are_sibcalls = 0;
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
if (crtl->nothrow
|
||
&& (cgraph_node::get (current_function_decl)->get_availability ()
|
||
>= AVAIL_AVAILABLE))
|
||
{
|
||
struct cgraph_node *node = cgraph_node::get (current_function_decl);
|
||
struct cgraph_edge *e;
|
||
for (e = node->callers; e; e = e->next_caller)
|
||
e->can_throw_external = false;
|
||
node->set_nothrow_flag (true);
|
||
|
||
if (dump_file)
|
||
fprintf (dump_file, "Marking function nothrow: %s\n\n",
|
||
current_function_name ());
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
namespace {
|
||
|
||
const pass_data pass_data_set_nothrow_function_flags =
|
||
{
|
||
RTL_PASS, /* type */
|
||
"nothrow", /* name */
|
||
OPTGROUP_NONE, /* optinfo_flags */
|
||
TV_NONE, /* tv_id */
|
||
0, /* properties_required */
|
||
0, /* properties_provided */
|
||
0, /* properties_destroyed */
|
||
0, /* todo_flags_start */
|
||
0, /* todo_flags_finish */
|
||
};
|
||
|
||
class pass_set_nothrow_function_flags : public rtl_opt_pass
|
||
{
|
||
public:
|
||
pass_set_nothrow_function_flags (gcc::context *ctxt)
|
||
: rtl_opt_pass (pass_data_set_nothrow_function_flags, ctxt)
|
||
{}
|
||
|
||
/* opt_pass methods: */
|
||
virtual unsigned int execute (function *)
|
||
{
|
||
return set_nothrow_function_flags ();
|
||
}
|
||
|
||
}; // class pass_set_nothrow_function_flags
|
||
|
||
} // anon namespace
|
||
|
||
rtl_opt_pass *
|
||
make_pass_set_nothrow_function_flags (gcc::context *ctxt)
|
||
{
|
||
return new pass_set_nothrow_function_flags (ctxt);
|
||
}
|
||
|
||
|
||
/* Various hooks for unwind library. */
|
||
|
||
/* Expand the EH support builtin functions:
|
||
__builtin_eh_pointer and __builtin_eh_filter. */
|
||
|
||
static eh_region
|
||
expand_builtin_eh_common (tree region_nr_t)
|
||
{
|
||
HOST_WIDE_INT region_nr;
|
||
eh_region region;
|
||
|
||
gcc_assert (tree_fits_shwi_p (region_nr_t));
|
||
region_nr = tree_to_shwi (region_nr_t);
|
||
|
||
region = (*cfun->eh->region_array)[region_nr];
|
||
|
||
/* ??? We shouldn't have been able to delete a eh region without
|
||
deleting all the code that depended on it. */
|
||
gcc_assert (region != NULL);
|
||
|
||
return region;
|
||
}
|
||
|
||
/* Expand to the exc_ptr value from the given eh region. */
|
||
|
||
rtx
|
||
expand_builtin_eh_pointer (tree exp)
|
||
{
|
||
eh_region region
|
||
= expand_builtin_eh_common (CALL_EXPR_ARG (exp, 0));
|
||
if (region->exc_ptr_reg == NULL)
|
||
region->exc_ptr_reg = gen_reg_rtx (ptr_mode);
|
||
return region->exc_ptr_reg;
|
||
}
|
||
|
||
/* Expand to the filter value from the given eh region. */
|
||
|
||
rtx
|
||
expand_builtin_eh_filter (tree exp)
|
||
{
|
||
eh_region region
|
||
= expand_builtin_eh_common (CALL_EXPR_ARG (exp, 0));
|
||
if (region->filter_reg == NULL)
|
||
region->filter_reg = gen_reg_rtx (targetm.eh_return_filter_mode ());
|
||
return region->filter_reg;
|
||
}
|
||
|
||
/* Copy the exc_ptr and filter values from one landing pad's registers
|
||
to another. This is used to inline the resx statement. */
|
||
|
||
rtx
|
||
expand_builtin_eh_copy_values (tree exp)
|
||
{
|
||
eh_region dst
|
||
= expand_builtin_eh_common (CALL_EXPR_ARG (exp, 0));
|
||
eh_region src
|
||
= expand_builtin_eh_common (CALL_EXPR_ARG (exp, 1));
|
||
scalar_int_mode fmode = targetm.eh_return_filter_mode ();
|
||
|
||
if (dst->exc_ptr_reg == NULL)
|
||
dst->exc_ptr_reg = gen_reg_rtx (ptr_mode);
|
||
if (src->exc_ptr_reg == NULL)
|
||
src->exc_ptr_reg = gen_reg_rtx (ptr_mode);
|
||
|
||
if (dst->filter_reg == NULL)
|
||
dst->filter_reg = gen_reg_rtx (fmode);
|
||
if (src->filter_reg == NULL)
|
||
src->filter_reg = gen_reg_rtx (fmode);
|
||
|
||
emit_move_insn (dst->exc_ptr_reg, src->exc_ptr_reg);
|
||
emit_move_insn (dst->filter_reg, src->filter_reg);
|
||
|
||
return const0_rtx;
|
||
}
|
||
|
||
/* Do any necessary initialization to access arbitrary stack frames.
|
||
On the SPARC, this means flushing the register windows. */
|
||
|
||
void
|
||
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. */
|
||
crtl->saves_all_registers = 1;
|
||
|
||
SETUP_FRAME_ADDRESSES ();
|
||
}
|
||
|
||
/* Map a non-negative number to an eh return data register number; expands
|
||
to -1 if no return data register is associated with the input number.
|
||
At least the inputs 0 and 1 must be mapped; the target may provide more. */
|
||
|
||
rtx
|
||
expand_builtin_eh_return_data_regno (tree exp)
|
||
{
|
||
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");
|
||
return constm1_rtx;
|
||
}
|
||
|
||
iwhich = tree_to_uhwi (which);
|
||
iwhich = EH_RETURN_DATA_REGNO (iwhich);
|
||
if (iwhich == INVALID_REGNUM)
|
||
return constm1_rtx;
|
||
|
||
#ifdef DWARF_FRAME_REGNUM
|
||
iwhich = DWARF_FRAME_REGNUM (iwhich);
|
||
#else
|
||
iwhich = DBX_REGISTER_NUMBER (iwhich);
|
||
#endif
|
||
|
||
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 (tree addr_tree)
|
||
{
|
||
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. */
|
||
rtx mask = MASK_RETURN_ADDR;
|
||
if (mask)
|
||
expand_and (Pmode, addr, mask, addr);
|
||
|
||
/* Then adjust to find the real return address. */
|
||
if (RETURN_ADDR_OFFSET)
|
||
addr = plus_constant (Pmode, addr, RETURN_ADDR_OFFSET);
|
||
|
||
return addr;
|
||
}
|
||
|
||
/* Given an actual address in addr_tree, do any necessary encoding
|
||
and return the value to be stored in the return address register or
|
||
stack slot so the epilogue will return to that address. */
|
||
|
||
rtx
|
||
expand_builtin_frob_return_addr (tree addr_tree)
|
||
{
|
||
rtx addr = expand_expr (addr_tree, NULL_RTX, ptr_mode, EXPAND_NORMAL);
|
||
|
||
addr = convert_memory_address (Pmode, addr);
|
||
|
||
if (RETURN_ADDR_OFFSET)
|
||
{
|
||
addr = force_reg (Pmode, addr);
|
||
addr = plus_constant (Pmode, addr, -RETURN_ADDR_OFFSET);
|
||
}
|
||
|
||
return addr;
|
||
}
|
||
|
||
/* Set up the epilogue with the magic bits we'll need to return to the
|
||
exception handler. */
|
||
|
||
void
|
||
expand_builtin_eh_return (tree stackadj_tree ATTRIBUTE_UNUSED,
|
||
tree handler_tree)
|
||
{
|
||
rtx tmp;
|
||
|
||
#ifdef EH_RETURN_STACKADJ_RTX
|
||
tmp = expand_expr (stackadj_tree, crtl->eh.ehr_stackadj,
|
||
VOIDmode, EXPAND_NORMAL);
|
||
tmp = convert_memory_address (Pmode, tmp);
|
||
if (!crtl->eh.ehr_stackadj)
|
||
crtl->eh.ehr_stackadj = copy_addr_to_reg (tmp);
|
||
else if (tmp != crtl->eh.ehr_stackadj)
|
||
emit_move_insn (crtl->eh.ehr_stackadj, tmp);
|
||
#endif
|
||
|
||
tmp = expand_expr (handler_tree, crtl->eh.ehr_handler,
|
||
VOIDmode, EXPAND_NORMAL);
|
||
tmp = convert_memory_address (Pmode, tmp);
|
||
if (!crtl->eh.ehr_handler)
|
||
crtl->eh.ehr_handler = copy_addr_to_reg (tmp);
|
||
else if (tmp != crtl->eh.ehr_handler)
|
||
emit_move_insn (crtl->eh.ehr_handler, tmp);
|
||
|
||
if (!crtl->eh.ehr_label)
|
||
crtl->eh.ehr_label = gen_label_rtx ();
|
||
emit_jump (crtl->eh.ehr_label);
|
||
}
|
||
|
||
/* Expand __builtin_eh_return. This exit path from the function loads up
|
||
the eh return data registers, adjusts the stack, and branches to a
|
||
given PC other than the normal return address. */
|
||
|
||
void
|
||
expand_eh_return (void)
|
||
{
|
||
rtx_code_label *around_label;
|
||
|
||
if (! crtl->eh.ehr_label)
|
||
return;
|
||
|
||
crtl->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_jump (around_label);
|
||
|
||
emit_label (crtl->eh.ehr_label);
|
||
clobber_return_register ();
|
||
|
||
#ifdef EH_RETURN_STACKADJ_RTX
|
||
emit_move_insn (EH_RETURN_STACKADJ_RTX, crtl->eh.ehr_stackadj);
|
||
#endif
|
||
|
||
if (targetm.have_eh_return ())
|
||
emit_insn (targetm.gen_eh_return (crtl->eh.ehr_handler));
|
||
else
|
||
{
|
||
if (rtx handler = EH_RETURN_HANDLER_RTX)
|
||
emit_move_insn (handler, crtl->eh.ehr_handler);
|
||
else
|
||
error ("%<__builtin_eh_return%> not supported on this target");
|
||
}
|
||
|
||
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 (targetm.unwind_word_mode (), ptr_mode, addr, extend);
|
||
}
|
||
|
||
static int
|
||
add_action_record (action_hash_type *ar_hash, int filter, int next)
|
||
{
|
||
struct action_record **slot, *new_ar, tmp;
|
||
|
||
tmp.filter = filter;
|
||
tmp.next = next;
|
||
slot = ar_hash->find_slot (&tmp, INSERT);
|
||
|
||
if ((new_ar = *slot) == NULL)
|
||
{
|
||
new_ar = XNEW (struct action_record);
|
||
new_ar->offset = crtl->eh.action_record_data->length () + 1;
|
||
new_ar->filter = filter;
|
||
new_ar->next = next;
|
||
*slot = new_ar;
|
||
|
||
/* The filter value goes in untouched. The link to the next
|
||
record is a "self-relative" byte offset, or zero to indicate
|
||
that there is no next record. So convert the absolute 1 based
|
||
indices we've been carrying around into a displacement. */
|
||
|
||
push_sleb128 (&crtl->eh.action_record_data, filter);
|
||
if (next)
|
||
next -= crtl->eh.action_record_data->length () + 1;
|
||
push_sleb128 (&crtl->eh.action_record_data, next);
|
||
}
|
||
|
||
return new_ar->offset;
|
||
}
|
||
|
||
static int
|
||
collect_one_action_chain (action_hash_type *ar_hash, eh_region region)
|
||
{
|
||
int next;
|
||
|
||
/* If we've reached the top of the region chain, then we have
|
||
no actions, and require no landing pad. */
|
||
if (region == NULL)
|
||
return -1;
|
||
|
||
switch (region->type)
|
||
{
|
||
case ERT_CLEANUP:
|
||
{
|
||
eh_region r;
|
||
/* A cleanup adds a zero filter to the beginning of the chain, but
|
||
there are special cases to look out for. If there are *only*
|
||
cleanups along a path, then it compresses to a zero action.
|
||
Further, if there are multiple cleanups along a path, we only
|
||
need to represent one of them, as that is enough to trigger
|
||
entry to the landing pad at runtime. */
|
||
next = collect_one_action_chain (ar_hash, region->outer);
|
||
if (next <= 0)
|
||
return 0;
|
||
for (r = region->outer; r ; r = r->outer)
|
||
if (r->type == ERT_CLEANUP)
|
||
return next;
|
||
return add_action_record (ar_hash, 0, next);
|
||
}
|
||
|
||
case ERT_TRY:
|
||
{
|
||
eh_catch c;
|
||
|
||
/* 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 haven't done the outer search. */
|
||
next = -3;
|
||
for (c = region->u.eh_try.last_catch; c ; c = c->prev_catch)
|
||
{
|
||
if (c->type_list == NULL)
|
||
{
|
||
/* Retrieve the filter from the head of the filter list
|
||
where we have stored it (see assign_filter_values). */
|
||
int filter = TREE_INT_CST_LOW (TREE_VALUE (c->filter_list));
|
||
next = add_action_record (ar_hash, filter, 0);
|
||
}
|
||
else
|
||
{
|
||
/* Once the outer search is done, trigger an action record for
|
||
each filter we have. */
|
||
tree flt_node;
|
||
|
||
if (next == -3)
|
||
{
|
||
next = collect_one_action_chain (ar_hash, region->outer);
|
||
|
||
/* 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);
|
||
}
|
||
|
||
flt_node = c->filter_list;
|
||
for (; flt_node; flt_node = TREE_CHAIN (flt_node))
|
||
{
|
||
int filter = TREE_INT_CST_LOW (TREE_VALUE (flt_node));
|
||
next = add_action_record (ar_hash, filter, next);
|
||
}
|
||
}
|
||
}
|
||
return next;
|
||
}
|
||
|
||
case ERT_ALLOWED_EXCEPTIONS:
|
||
/* An exception specification adds its filter to the
|
||
beginning of the chain. */
|
||
next = collect_one_action_chain (ar_hash, region->outer);
|
||
|
||
/* 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
|
||
requires no call-site entry. Note that this differs from
|
||
the no handler or cleanup case in that we do require an lsda
|
||
to be generated. Return a magic -2 value to record this. */
|
||
return -2;
|
||
}
|
||
|
||
gcc_unreachable ();
|
||
}
|
||
|
||
static int
|
||
add_call_site (rtx landing_pad, int action, int section)
|
||
{
|
||
call_site_record record;
|
||
|
||
record = ggc_alloc<call_site_record_d> ();
|
||
record->landing_pad = landing_pad;
|
||
record->action = action;
|
||
|
||
vec_safe_push (crtl->eh.call_site_record_v[section], record);
|
||
|
||
return call_site_base + crtl->eh.call_site_record_v[section]->length () - 1;
|
||
}
|
||
|
||
static rtx_note *
|
||
emit_note_eh_region_end (rtx_insn *insn)
|
||
{
|
||
return emit_note_after (NOTE_INSN_EH_REGION_END, insn);
|
||
}
|
||
|
||
/* Add NOP after NOTE_INSN_SWITCH_TEXT_SECTIONS when the cold section starts
|
||
with landing pad.
|
||
With landing pad being at offset 0 from the start label of the section
|
||
we would miss EH delivery because 0 is special and means no landing pad. */
|
||
|
||
static bool
|
||
maybe_add_nop_after_section_switch (void)
|
||
{
|
||
if (!crtl->uses_eh_lsda
|
||
|| !crtl->eh.call_site_record_v[1])
|
||
return false;
|
||
int n = vec_safe_length (crtl->eh.call_site_record_v[1]);
|
||
hash_set<rtx_insn *> visited;
|
||
|
||
for (int i = 0; i < n; ++i)
|
||
{
|
||
struct call_site_record_d *cs
|
||
= (*crtl->eh.call_site_record_v[1])[i];
|
||
if (cs->landing_pad)
|
||
{
|
||
rtx_insn *insn = as_a <rtx_insn *> (cs->landing_pad);
|
||
while (true)
|
||
{
|
||
/* Landing pads have LABEL_PRESERVE_P flag set. This check make
|
||
sure that we do not walk past landing pad visited earlier
|
||
which would result in possible quadratic behaviour. */
|
||
if (LABEL_P (insn) && LABEL_PRESERVE_P (insn)
|
||
&& visited.add (insn))
|
||
break;
|
||
|
||
/* Conservatively assume that ASM insn may be empty. We have
|
||
now way to tell what they contain. */
|
||
if (active_insn_p (insn)
|
||
&& GET_CODE (PATTERN (insn)) != ASM_INPUT
|
||
&& GET_CODE (PATTERN (insn)) != ASM_OPERANDS)
|
||
break;
|
||
|
||
/* If we reached the start of hot section, then NOP will be
|
||
needed. */
|
||
if (GET_CODE (insn) == NOTE
|
||
&& NOTE_KIND (insn) == NOTE_INSN_SWITCH_TEXT_SECTIONS)
|
||
{
|
||
emit_insn_after (gen_nop (), insn);
|
||
break;
|
||
}
|
||
|
||
/* We visit only labels from cold section. We should never hit
|
||
begining of the insn stream here. */
|
||
insn = PREV_INSN (insn);
|
||
}
|
||
}
|
||
}
|
||
return false;
|
||
}
|
||
|
||
/* Turn REG_EH_REGION notes back into NOTE_INSN_EH_REGION notes.
|
||
The new note numbers will not refer to region numbers, but
|
||
instead to call site entries. */
|
||
|
||
static unsigned int
|
||
convert_to_eh_region_ranges (void)
|
||
{
|
||
rtx insn;
|
||
rtx_insn *iter;
|
||
rtx_note *note;
|
||
action_hash_type ar_hash (31);
|
||
int last_action = -3;
|
||
rtx_insn *last_action_insn = NULL;
|
||
rtx last_landing_pad = NULL_RTX;
|
||
rtx_insn *first_no_action_insn = NULL;
|
||
int call_site = 0;
|
||
int cur_sec = 0;
|
||
rtx_insn *section_switch_note = NULL;
|
||
rtx_insn *first_no_action_insn_before_switch = NULL;
|
||
rtx_insn *last_no_action_insn_before_switch = NULL;
|
||
int saved_call_site_base = call_site_base;
|
||
|
||
vec_alloc (crtl->eh.action_record_data, 64);
|
||
|
||
for (iter = get_insns (); iter ; iter = NEXT_INSN (iter))
|
||
if (INSN_P (iter))
|
||
{
|
||
eh_landing_pad lp;
|
||
eh_region region;
|
||
bool nothrow;
|
||
int this_action;
|
||
rtx_code_label *this_landing_pad;
|
||
|
||
insn = iter;
|
||
if (NONJUMP_INSN_P (insn)
|
||
&& GET_CODE (PATTERN (insn)) == SEQUENCE)
|
||
insn = XVECEXP (PATTERN (insn), 0, 0);
|
||
|
||
nothrow = get_eh_region_and_lp_from_rtx (insn, ®ion, &lp);
|
||
if (nothrow)
|
||
continue;
|
||
if (region)
|
||
this_action = collect_one_action_chain (&ar_hash, region);
|
||
else
|
||
this_action = -1;
|
||
|
||
/* Existence of catch handlers, or must-not-throw regions
|
||
implies that an lsda is needed (even if empty). */
|
||
if (this_action != -1)
|
||
crtl->uses_eh_lsda = 1;
|
||
|
||
/* Delay creation of region notes for no-action regions
|
||
until we're sure that an lsda will be required. */
|
||
else if (last_action == -3)
|
||
{
|
||
first_no_action_insn = iter;
|
||
last_action = -1;
|
||
}
|
||
|
||
if (this_action >= 0)
|
||
this_landing_pad = lp->landing_pad;
|
||
else
|
||
this_landing_pad = NULL;
|
||
|
||
/* Differing actions or landing pads implies a change in call-site
|
||
info, which implies some EH_REGION note should be emitted. */
|
||
if (last_action != this_action
|
||
|| last_landing_pad != this_landing_pad)
|
||
{
|
||
/* If there is a queued no-action region in the other section
|
||
with hot/cold partitioning, emit it now. */
|
||
if (first_no_action_insn_before_switch)
|
||
{
|
||
gcc_assert (this_action != -1
|
||
&& last_action == (first_no_action_insn
|
||
? -1 : -3));
|
||
call_site = add_call_site (NULL_RTX, 0, 0);
|
||
note = emit_note_before (NOTE_INSN_EH_REGION_BEG,
|
||
first_no_action_insn_before_switch);
|
||
NOTE_EH_HANDLER (note) = call_site;
|
||
note
|
||
= emit_note_eh_region_end (last_no_action_insn_before_switch);
|
||
NOTE_EH_HANDLER (note) = call_site;
|
||
gcc_assert (last_action != -3
|
||
|| (last_action_insn
|
||
== last_no_action_insn_before_switch));
|
||
first_no_action_insn_before_switch = NULL;
|
||
last_no_action_insn_before_switch = NULL;
|
||
call_site_base++;
|
||
}
|
||
/* If we'd not seen a previous action (-3) or the previous
|
||
action was must-not-throw (-2), then we do not need an
|
||
end note. */
|
||
if (last_action >= -1)
|
||
{
|
||
/* If we delayed the creation of the begin, do it now. */
|
||
if (first_no_action_insn)
|
||
{
|
||
call_site = add_call_site (NULL_RTX, 0, cur_sec);
|
||
note = emit_note_before (NOTE_INSN_EH_REGION_BEG,
|
||
first_no_action_insn);
|
||
NOTE_EH_HANDLER (note) = call_site;
|
||
first_no_action_insn = NULL;
|
||
}
|
||
|
||
note = emit_note_eh_region_end (last_action_insn);
|
||
NOTE_EH_HANDLER (note) = call_site;
|
||
}
|
||
|
||
/* If the new action is must-not-throw, then no region notes
|
||
are created. */
|
||
if (this_action >= -1)
|
||
{
|
||
call_site = add_call_site (this_landing_pad,
|
||
this_action < 0 ? 0 : this_action,
|
||
cur_sec);
|
||
note = emit_note_before (NOTE_INSN_EH_REGION_BEG, iter);
|
||
NOTE_EH_HANDLER (note) = call_site;
|
||
}
|
||
|
||
last_action = this_action;
|
||
last_landing_pad = this_landing_pad;
|
||
}
|
||
last_action_insn = iter;
|
||
}
|
||
else if (NOTE_P (iter)
|
||
&& NOTE_KIND (iter) == NOTE_INSN_SWITCH_TEXT_SECTIONS)
|
||
{
|
||
gcc_assert (section_switch_note == NULL_RTX);
|
||
gcc_assert (flag_reorder_blocks_and_partition);
|
||
section_switch_note = iter;
|
||
if (first_no_action_insn)
|
||
{
|
||
first_no_action_insn_before_switch = first_no_action_insn;
|
||
last_no_action_insn_before_switch = last_action_insn;
|
||
first_no_action_insn = NULL;
|
||
gcc_assert (last_action == -1);
|
||
last_action = -3;
|
||
}
|
||
/* Force closing of current EH region before section switch and
|
||
opening a new one afterwards. */
|
||
else if (last_action != -3)
|
||
last_landing_pad = pc_rtx;
|
||
if (crtl->eh.call_site_record_v[cur_sec])
|
||
call_site_base += crtl->eh.call_site_record_v[cur_sec]->length ();
|
||
cur_sec++;
|
||
gcc_assert (crtl->eh.call_site_record_v[cur_sec] == NULL);
|
||
vec_alloc (crtl->eh.call_site_record_v[cur_sec], 10);
|
||
}
|
||
|
||
if (last_action >= -1 && ! first_no_action_insn)
|
||
{
|
||
note = emit_note_eh_region_end (last_action_insn);
|
||
NOTE_EH_HANDLER (note) = call_site;
|
||
}
|
||
|
||
call_site_base = saved_call_site_base;
|
||
|
||
return 0;
|
||
}
|
||
|
||
namespace {
|
||
|
||
const pass_data pass_data_convert_to_eh_region_ranges =
|
||
{
|
||
RTL_PASS, /* type */
|
||
"eh_ranges", /* name */
|
||
OPTGROUP_NONE, /* optinfo_flags */
|
||
TV_NONE, /* tv_id */
|
||
0, /* properties_required */
|
||
0, /* properties_provided */
|
||
0, /* properties_destroyed */
|
||
0, /* todo_flags_start */
|
||
0, /* todo_flags_finish */
|
||
};
|
||
|
||
class pass_convert_to_eh_region_ranges : public rtl_opt_pass
|
||
{
|
||
public:
|
||
pass_convert_to_eh_region_ranges (gcc::context *ctxt)
|
||
: rtl_opt_pass (pass_data_convert_to_eh_region_ranges, ctxt)
|
||
{}
|
||
|
||
/* opt_pass methods: */
|
||
virtual bool gate (function *);
|
||
virtual unsigned int execute (function *)
|
||
{
|
||
int ret = convert_to_eh_region_ranges ();
|
||
maybe_add_nop_after_section_switch ();
|
||
return ret;
|
||
}
|
||
|
||
}; // class pass_convert_to_eh_region_ranges
|
||
|
||
bool
|
||
pass_convert_to_eh_region_ranges::gate (function *)
|
||
{
|
||
/* Nothing to do for SJLJ exceptions or if no regions created. */
|
||
if (cfun->eh->region_tree == NULL)
|
||
return false;
|
||
if (targetm_common.except_unwind_info (&global_options) == UI_SJLJ)
|
||
return false;
|
||
return true;
|
||
}
|
||
|
||
} // anon namespace
|
||
|
||
rtl_opt_pass *
|
||
make_pass_convert_to_eh_region_ranges (gcc::context *ctxt)
|
||
{
|
||
return new pass_convert_to_eh_region_ranges (ctxt);
|
||
}
|
||
|
||
static void
|
||
push_uleb128 (vec<uchar, va_gc> **data_area, unsigned int value)
|
||
{
|
||
do
|
||
{
|
||
unsigned char byte = value & 0x7f;
|
||
value >>= 7;
|
||
if (value)
|
||
byte |= 0x80;
|
||
vec_safe_push (*data_area, byte);
|
||
}
|
||
while (value);
|
||
}
|
||
|
||
static void
|
||
push_sleb128 (vec<uchar, va_gc> **data_area, int value)
|
||
{
|
||
unsigned char byte;
|
||
int more;
|
||
|
||
do
|
||
{
|
||
byte = value & 0x7f;
|
||
value >>= 7;
|
||
more = ! ((value == 0 && (byte & 0x40) == 0)
|
||
|| (value == -1 && (byte & 0x40) != 0));
|
||
if (more)
|
||
byte |= 0x80;
|
||
vec_safe_push (*data_area, byte);
|
||
}
|
||
while (more);
|
||
}
|
||
|
||
|
||
static int
|
||
dw2_size_of_call_site_table (int section)
|
||
{
|
||
int n = vec_safe_length (crtl->eh.call_site_record_v[section]);
|
||
int size = n * (4 + 4 + 4);
|
||
int i;
|
||
|
||
for (i = 0; i < n; ++i)
|
||
{
|
||
struct call_site_record_d *cs =
|
||
(*crtl->eh.call_site_record_v[section])[i];
|
||
size += size_of_uleb128 (cs->action);
|
||
}
|
||
|
||
return size;
|
||
}
|
||
|
||
static int
|
||
sjlj_size_of_call_site_table (void)
|
||
{
|
||
int n = vec_safe_length (crtl->eh.call_site_record_v[0]);
|
||
int size = 0;
|
||
int i;
|
||
|
||
for (i = 0; i < n; ++i)
|
||
{
|
||
struct call_site_record_d *cs =
|
||
(*crtl->eh.call_site_record_v[0])[i];
|
||
size += size_of_uleb128 (INTVAL (cs->landing_pad));
|
||
size += size_of_uleb128 (cs->action);
|
||
}
|
||
|
||
return size;
|
||
}
|
||
|
||
static void
|
||
dw2_output_call_site_table (int cs_format, int section)
|
||
{
|
||
int n = vec_safe_length (crtl->eh.call_site_record_v[section]);
|
||
int i;
|
||
const char *begin;
|
||
|
||
if (section == 0)
|
||
begin = current_function_func_begin_label;
|
||
else if (first_function_block_is_cold)
|
||
begin = crtl->subsections.hot_section_label;
|
||
else
|
||
begin = crtl->subsections.cold_section_label;
|
||
|
||
for (i = 0; i < n; ++i)
|
||
{
|
||
struct call_site_record_d *cs = (*crtl->eh.call_site_record_v[section])[i];
|
||
char reg_start_lab[32];
|
||
char reg_end_lab[32];
|
||
char landing_pad_lab[32];
|
||
|
||
ASM_GENERATE_INTERNAL_LABEL (reg_start_lab, "LEHB", call_site_base + i);
|
||
ASM_GENERATE_INTERNAL_LABEL (reg_end_lab, "LEHE", call_site_base + i);
|
||
|
||
if (cs->landing_pad)
|
||
ASM_GENERATE_INTERNAL_LABEL (landing_pad_lab, "L",
|
||
CODE_LABEL_NUMBER (cs->landing_pad));
|
||
|
||
/* ??? Perhaps use insn length scaling if the assembler supports
|
||
generic arithmetic. */
|
||
/* ??? Perhaps use attr_length to choose data1 or data2 instead of
|
||
data4 if the function is small enough. */
|
||
if (cs_format == DW_EH_PE_uleb128)
|
||
{
|
||
dw2_asm_output_delta_uleb128 (reg_start_lab, begin,
|
||
"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, begin,
|
||
"landing pad");
|
||
else
|
||
dw2_asm_output_data_uleb128 (0, "landing pad");
|
||
}
|
||
else
|
||
{
|
||
dw2_asm_output_delta (4, reg_start_lab, begin,
|
||
"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, begin,
|
||
"landing pad");
|
||
else
|
||
dw2_asm_output_data (4, 0, "landing pad");
|
||
}
|
||
dw2_asm_output_data_uleb128 (cs->action, "action");
|
||
}
|
||
|
||
call_site_base += n;
|
||
}
|
||
|
||
static void
|
||
sjlj_output_call_site_table (void)
|
||
{
|
||
int n = vec_safe_length (crtl->eh.call_site_record_v[0]);
|
||
int i;
|
||
|
||
for (i = 0; i < n; ++i)
|
||
{
|
||
struct call_site_record_d *cs = (*crtl->eh.call_site_record_v[0])[i];
|
||
|
||
dw2_asm_output_data_uleb128 (INTVAL (cs->landing_pad),
|
||
"region %d landing pad", i);
|
||
dw2_asm_output_data_uleb128 (cs->action, "action");
|
||
}
|
||
|
||
call_site_base += n;
|
||
}
|
||
|
||
/* 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
|
||
{
|
||
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;
|
||
|
||
/* Compute the section and cache it into exception_section,
|
||
unless it depends on the function name. */
|
||
if (targetm_common.have_named_sections)
|
||
{
|
||
#ifdef HAVE_LD_EH_GC_SECTIONS
|
||
if (flag_function_sections
|
||
|| (DECL_COMDAT_GROUP (current_function_decl) && HAVE_COMDAT_GROUP))
|
||
{
|
||
char *section_name = XNEWVEC (char, strlen (fnname) + 32);
|
||
/* The EH table must match the code section, so only mark
|
||
it linkonce if we have COMDAT groups to tie them together. */
|
||
if (DECL_COMDAT_GROUP (current_function_decl) && HAVE_COMDAT_GROUP)
|
||
flags |= SECTION_LINKONCE;
|
||
sprintf (section_name, ".gcc_except_table.%s", fnname);
|
||
s = get_section (section_name, flags, current_function_decl);
|
||
free (section_name);
|
||
}
|
||
else
|
||
#endif
|
||
exception_section
|
||
= s = get_section (".gcc_except_table", flags, NULL);
|
||
}
|
||
else
|
||
exception_section
|
||
= s = flags == SECTION_WRITE ? data_section : readonly_data_section;
|
||
}
|
||
|
||
switch_to_section (s);
|
||
}
|
||
|
||
/* 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 is_public = true;
|
||
|
||
if (type == NULL_TREE)
|
||
value = const0_rtx;
|
||
else
|
||
{
|
||
/* FIXME lto. pass_ipa_free_lang_data changes all types to
|
||
runtime types so TYPE should already be a runtime type
|
||
reference. When pass_ipa_free_lang data is made a default
|
||
pass, we can then remove the call to lookup_type_for_runtime
|
||
below. */
|
||
if (TYPE_P (type))
|
||
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 (VAR_P (type))
|
||
is_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, is_public, NULL);
|
||
}
|
||
|
||
/* Output an exception table for the current function according to SECTION.
|
||
|
||
If the function has been partitioned into hot and cold parts, value 0 for
|
||
SECTION refers to the table associated with the hot part while value 1
|
||
refers to the table associated with the cold part. If the function has
|
||
not been partitioned, value 0 refers to the single exception table. */
|
||
|
||
static void
|
||
output_one_function_exception_table (int section)
|
||
{
|
||
int tt_format, cs_format, lp_format, i;
|
||
char ttype_label[32];
|
||
char cs_after_size_label[32];
|
||
char cs_end_label[32];
|
||
int call_site_len;
|
||
int have_tt_data;
|
||
int tt_format_size = 0;
|
||
|
||
have_tt_data = (vec_safe_length (cfun->eh->ttype_data)
|
||
|| (targetm.arm_eabi_unwinder
|
||
? vec_safe_length (cfun->eh->ehspec_data.arm_eabi)
|
||
: vec_safe_length (cfun->eh->ehspec_data.other)));
|
||
|
||
/* Indicate the format of the @TType entries. */
|
||
if (! have_tt_data)
|
||
tt_format = DW_EH_PE_omit;
|
||
else
|
||
{
|
||
tt_format = ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/0, /*global=*/1);
|
||
if (HAVE_AS_LEB128)
|
||
ASM_GENERATE_INTERNAL_LABEL (ttype_label,
|
||
section ? "LLSDATTC" : "LLSDATT",
|
||
current_function_funcdef_no);
|
||
|
||
tt_format_size = size_of_encoded_value (tt_format);
|
||
|
||
assemble_align (tt_format_size * BITS_PER_UNIT);
|
||
}
|
||
|
||
targetm.asm_out.internal_label (asm_out_file, section ? "LLSDAC" : "LLSDA",
|
||
current_function_funcdef_no);
|
||
|
||
/* The LSDA header. */
|
||
|
||
/* Indicate the format of the landing pad start pointer. An omitted
|
||
field implies @LPStart == @Start. */
|
||
/* Currently we always put @LPStart == @Start. This field would
|
||
be most useful in moving the landing pads completely out of
|
||
line to another section, but it could also be used to minimize
|
||
the size of uleb128 landing pad offsets. */
|
||
lp_format = DW_EH_PE_omit;
|
||
dw2_asm_output_data (1, lp_format, "@LPStart format (%s)",
|
||
eh_data_format_name (lp_format));
|
||
|
||
/* @LPStart pointer would go here. */
|
||
|
||
dw2_asm_output_data (1, tt_format, "@TType format (%s)",
|
||
eh_data_format_name (tt_format));
|
||
|
||
if (!HAVE_AS_LEB128)
|
||
{
|
||
if (targetm_common.except_unwind_info (&global_options) == UI_SJLJ)
|
||
call_site_len = sjlj_size_of_call_site_table ();
|
||
else
|
||
call_site_len = dw2_size_of_call_site_table (section);
|
||
}
|
||
|
||
/* A pc-relative 4-byte displacement to the @TType data. */
|
||
if (have_tt_data)
|
||
{
|
||
if (HAVE_AS_LEB128)
|
||
{
|
||
char ttype_after_disp_label[32];
|
||
ASM_GENERATE_INTERNAL_LABEL (ttype_after_disp_label,
|
||
section ? "LLSDATTDC" : "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);
|
||
}
|
||
else
|
||
{
|
||
/* Ug. Alignment queers things. */
|
||
unsigned int before_disp, after_disp, last_disp, disp;
|
||
|
||
before_disp = 1 + 1;
|
||
after_disp = (1 + size_of_uleb128 (call_site_len)
|
||
+ call_site_len
|
||
+ vec_safe_length (crtl->eh.action_record_data)
|
||
+ (vec_safe_length (cfun->eh->ttype_data)
|
||
* tt_format_size));
|
||
|
||
disp = after_disp;
|
||
do
|
||
{
|
||
unsigned int disp_size, pad;
|
||
|
||
last_disp = disp;
|
||
disp_size = size_of_uleb128 (disp);
|
||
pad = before_disp + disp_size + after_disp;
|
||
if (pad % tt_format_size)
|
||
pad = tt_format_size - (pad % tt_format_size);
|
||
else
|
||
pad = 0;
|
||
disp = after_disp + pad;
|
||
}
|
||
while (disp != last_disp);
|
||
|
||
dw2_asm_output_data_uleb128 (disp, "@TType base offset");
|
||
}
|
||
}
|
||
|
||
/* Indicate the format of the call-site offsets. */
|
||
if (HAVE_AS_LEB128)
|
||
cs_format = DW_EH_PE_uleb128;
|
||
else
|
||
cs_format = DW_EH_PE_udata4;
|
||
|
||
dw2_asm_output_data (1, cs_format, "call-site format (%s)",
|
||
eh_data_format_name (cs_format));
|
||
|
||
if (HAVE_AS_LEB128)
|
||
{
|
||
ASM_GENERATE_INTERNAL_LABEL (cs_after_size_label,
|
||
section ? "LLSDACSBC" : "LLSDACSB",
|
||
current_function_funcdef_no);
|
||
ASM_GENERATE_INTERNAL_LABEL (cs_end_label,
|
||
section ? "LLSDACSEC" : "LLSDACSE",
|
||
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 (targetm_common.except_unwind_info (&global_options) == UI_SJLJ)
|
||
sjlj_output_call_site_table ();
|
||
else
|
||
dw2_output_call_site_table (cs_format, section);
|
||
ASM_OUTPUT_LABEL (asm_out_file, cs_end_label);
|
||
}
|
||
else
|
||
{
|
||
dw2_asm_output_data_uleb128 (call_site_len, "Call-site table length");
|
||
if (targetm_common.except_unwind_info (&global_options) == UI_SJLJ)
|
||
sjlj_output_call_site_table ();
|
||
else
|
||
dw2_output_call_site_table (cs_format, section);
|
||
}
|
||
|
||
/* ??? Decode and interpret the data for flag_debug_asm. */
|
||
{
|
||
uchar uc;
|
||
FOR_EACH_VEC_ELT (*crtl->eh.action_record_data, i, uc)
|
||
dw2_asm_output_data (1, uc, i ? NULL : "Action record table");
|
||
}
|
||
|
||
if (have_tt_data)
|
||
assemble_align (tt_format_size * BITS_PER_UNIT);
|
||
|
||
i = vec_safe_length (cfun->eh->ttype_data);
|
||
while (i-- > 0)
|
||
{
|
||
tree type = (*cfun->eh->ttype_data)[i];
|
||
output_ttype (type, tt_format, tt_format_size);
|
||
}
|
||
|
||
if (HAVE_AS_LEB128 && have_tt_data)
|
||
ASM_OUTPUT_LABEL (asm_out_file, ttype_label);
|
||
|
||
/* ??? Decode and interpret the data for flag_debug_asm. */
|
||
if (targetm.arm_eabi_unwinder)
|
||
{
|
||
tree type;
|
||
for (i = 0;
|
||
vec_safe_iterate (cfun->eh->ehspec_data.arm_eabi, i, &type); ++i)
|
||
output_ttype (type, tt_format, tt_format_size);
|
||
}
|
||
else
|
||
{
|
||
uchar uc;
|
||
for (i = 0;
|
||
vec_safe_iterate (cfun->eh->ehspec_data.other, i, &uc); ++i)
|
||
dw2_asm_output_data (1, uc,
|
||
i ? NULL : "Exception specification table");
|
||
}
|
||
}
|
||
|
||
/* Output an exception table for the current function according to SECTION,
|
||
switching back and forth from the function section appropriately.
|
||
|
||
If the function has been partitioned into hot and cold parts, value 0 for
|
||
SECTION refers to the table associated with the hot part while value 1
|
||
refers to the table associated with the cold part. If the function has
|
||
not been partitioned, value 0 refers to the single exception table. */
|
||
|
||
void
|
||
output_function_exception_table (int section)
|
||
{
|
||
const char *fnname = get_fnname_from_decl (current_function_decl);
|
||
rtx personality = get_personality_function (current_function_decl);
|
||
|
||
/* Not all functions need anything. */
|
||
if (!crtl->uses_eh_lsda
|
||
|| targetm_common.except_unwind_info (&global_options) == UI_NONE)
|
||
return;
|
||
|
||
/* No need to emit any boilerplate stuff for the cold part. */
|
||
if (section == 1 && !crtl->eh.call_site_record_v[1])
|
||
return;
|
||
|
||
if (personality)
|
||
{
|
||
assemble_external_libcall (personality);
|
||
|
||
if (targetm.asm_out.emit_except_personality)
|
||
targetm.asm_out.emit_except_personality (personality);
|
||
}
|
||
|
||
switch_to_exception_section (fnname);
|
||
|
||
/* If the target wants a label to begin the table, emit it here. */
|
||
targetm.asm_out.emit_except_table_label (asm_out_file);
|
||
|
||
/* Do the real work. */
|
||
output_one_function_exception_table (section);
|
||
|
||
switch_to_section (current_function_section ());
|
||
}
|
||
|
||
void
|
||
set_eh_throw_stmt_table (function *fun, hash_map<gimple *, int> *table)
|
||
{
|
||
fun->eh->throw_stmt_table = table;
|
||
}
|
||
|
||
hash_map<gimple *, int> *
|
||
get_eh_throw_stmt_table (struct function *fun)
|
||
{
|
||
return fun->eh->throw_stmt_table;
|
||
}
|
||
|
||
/* Determine if the function needs an EH personality function. */
|
||
|
||
enum eh_personality_kind
|
||
function_needs_eh_personality (struct function *fn)
|
||
{
|
||
enum eh_personality_kind kind = eh_personality_none;
|
||
eh_region i;
|
||
|
||
FOR_ALL_EH_REGION_FN (i, fn)
|
||
{
|
||
switch (i->type)
|
||
{
|
||
case ERT_CLEANUP:
|
||
/* Can do with any personality including the generic C one. */
|
||
kind = eh_personality_any;
|
||
break;
|
||
|
||
case ERT_TRY:
|
||
case ERT_ALLOWED_EXCEPTIONS:
|
||
/* Always needs a EH personality function. The generic C
|
||
personality doesn't handle these even for empty type lists. */
|
||
return eh_personality_lang;
|
||
|
||
case ERT_MUST_NOT_THROW:
|
||
/* Always needs a EH personality function. The language may specify
|
||
what abort routine that must be used, e.g. std::terminate. */
|
||
return eh_personality_lang;
|
||
}
|
||
}
|
||
|
||
return kind;
|
||
}
|
||
|
||
/* Dump EH information to OUT. */
|
||
|
||
void
|
||
dump_eh_tree (FILE * out, struct function *fun)
|
||
{
|
||
eh_region i;
|
||
int depth = 0;
|
||
static const char *const type_name[] = {
|
||
"cleanup", "try", "allowed_exceptions", "must_not_throw"
|
||
};
|
||
|
||
i = fun->eh->region_tree;
|
||
if (!i)
|
||
return;
|
||
|
||
fprintf (out, "Eh tree:\n");
|
||
while (1)
|
||
{
|
||
fprintf (out, " %*s %i %s", depth * 2, "",
|
||
i->index, type_name[(int) i->type]);
|
||
|
||
if (i->landing_pads)
|
||
{
|
||
eh_landing_pad lp;
|
||
|
||
fprintf (out, " land:");
|
||
if (current_ir_type () == IR_GIMPLE)
|
||
{
|
||
for (lp = i->landing_pads; lp ; lp = lp->next_lp)
|
||
{
|
||
fprintf (out, "{%i,", lp->index);
|
||
print_generic_expr (out, lp->post_landing_pad);
|
||
fputc ('}', out);
|
||
if (lp->next_lp)
|
||
fputc (',', out);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
for (lp = i->landing_pads; lp ; lp = lp->next_lp)
|
||
{
|
||
fprintf (out, "{%i,", lp->index);
|
||
if (lp->landing_pad)
|
||
fprintf (out, "%i%s,", INSN_UID (lp->landing_pad),
|
||
NOTE_P (lp->landing_pad) ? "(del)" : "");
|
||
else
|
||
fprintf (out, "(nil),");
|
||
if (lp->post_landing_pad)
|
||
{
|
||
rtx_insn *lab = label_rtx (lp->post_landing_pad);
|
||
fprintf (out, "%i%s}", INSN_UID (lab),
|
||
NOTE_P (lab) ? "(del)" : "");
|
||
}
|
||
else
|
||
fprintf (out, "(nil)}");
|
||
if (lp->next_lp)
|
||
fputc (',', out);
|
||
}
|
||
}
|
||
}
|
||
|
||
switch (i->type)
|
||
{
|
||
case ERT_CLEANUP:
|
||
case ERT_MUST_NOT_THROW:
|
||
break;
|
||
|
||
case ERT_TRY:
|
||
{
|
||
eh_catch c;
|
||
fprintf (out, " catch:");
|
||
for (c = i->u.eh_try.first_catch; c; c = c->next_catch)
|
||
{
|
||
fputc ('{', out);
|
||
if (c->label)
|
||
{
|
||
fprintf (out, "lab:");
|
||
print_generic_expr (out, c->label);
|
||
fputc (';', out);
|
||
}
|
||
print_generic_expr (out, c->type_list);
|
||
fputc ('}', out);
|
||
if (c->next_catch)
|
||
fputc (',', out);
|
||
}
|
||
}
|
||
break;
|
||
|
||
case ERT_ALLOWED_EXCEPTIONS:
|
||
fprintf (out, " filter :%i types:", i->u.allowed.filter);
|
||
print_generic_expr (out, i->u.allowed.type_list);
|
||
break;
|
||
}
|
||
fputc ('\n', out);
|
||
|
||
/* 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;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Dump the EH tree for FN on stderr. */
|
||
|
||
DEBUG_FUNCTION void
|
||
debug_eh_tree (struct function *fn)
|
||
{
|
||
dump_eh_tree (stderr, fn);
|
||
}
|
||
|
||
/* Verify invariants on EH datastructures. */
|
||
|
||
DEBUG_FUNCTION void
|
||
verify_eh_tree (struct function *fun)
|
||
{
|
||
eh_region r, outer;
|
||
int nvisited_lp, nvisited_r;
|
||
int count_lp, count_r, depth, i;
|
||
eh_landing_pad lp;
|
||
bool err = false;
|
||
|
||
if (!fun->eh->region_tree)
|
||
return;
|
||
|
||
count_r = 0;
|
||
for (i = 1; vec_safe_iterate (fun->eh->region_array, i, &r); ++i)
|
||
if (r)
|
||
{
|
||
if (r->index == i)
|
||
count_r++;
|
||
else
|
||
{
|
||
error ("%<region_array%> is corrupted for region %i", r->index);
|
||
err = true;
|
||
}
|
||
}
|
||
|
||
count_lp = 0;
|
||
for (i = 1; vec_safe_iterate (fun->eh->lp_array, i, &lp); ++i)
|
||
if (lp)
|
||
{
|
||
if (lp->index == i)
|
||
count_lp++;
|
||
else
|
||
{
|
||
error ("%<lp_array%> is corrupted for lp %i", lp->index);
|
||
err = true;
|
||
}
|
||
}
|
||
|
||
depth = nvisited_lp = nvisited_r = 0;
|
||
outer = NULL;
|
||
r = fun->eh->region_tree;
|
||
while (1)
|
||
{
|
||
if ((*fun->eh->region_array)[r->index] != r)
|
||
{
|
||
error ("%<region_array%> is corrupted for region %i", r->index);
|
||
err = true;
|
||
}
|
||
if (r->outer != outer)
|
||
{
|
||
error ("outer block of region %i is wrong", r->index);
|
||
err = true;
|
||
}
|
||
if (depth < 0)
|
||
{
|
||
error ("negative nesting depth of region %i", r->index);
|
||
err = true;
|
||
}
|
||
nvisited_r++;
|
||
|
||
for (lp = r->landing_pads; lp ; lp = lp->next_lp)
|
||
{
|
||
if ((*fun->eh->lp_array)[lp->index] != lp)
|
||
{
|
||
error ("%<lp_array%> is corrupted for lp %i", lp->index);
|
||
err = true;
|
||
}
|
||
if (lp->region != r)
|
||
{
|
||
error ("region of lp %i is wrong", lp->index);
|
||
err = true;
|
||
}
|
||
nvisited_lp++;
|
||
}
|
||
|
||
if (r->inner)
|
||
outer = r, r = r->inner, depth++;
|
||
else if (r->next_peer)
|
||
r = r->next_peer;
|
||
else
|
||
{
|
||
do
|
||
{
|
||
r = r->outer;
|
||
if (r == NULL)
|
||
goto region_done;
|
||
depth--;
|
||
outer = r->outer;
|
||
}
|
||
while (r->next_peer == NULL);
|
||
r = r->next_peer;
|
||
}
|
||
}
|
||
region_done:
|
||
if (depth != 0)
|
||
{
|
||
error ("tree list ends on depth %i", depth);
|
||
err = true;
|
||
}
|
||
if (count_r != nvisited_r)
|
||
{
|
||
error ("%<region_array%> does not match %<region_tree%>");
|
||
err = true;
|
||
}
|
||
if (count_lp != nvisited_lp)
|
||
{
|
||
error ("%<lp_array%> does not match %<region_tree%>");
|
||
err = true;
|
||
}
|
||
|
||
if (err)
|
||
{
|
||
dump_eh_tree (stderr, fun);
|
||
internal_error ("%qs failed", __func__);
|
||
}
|
||
}
|
||
|
||
#include "gt-except.h"
|