OpenE2K
/
gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
gcc/gcc/except.h

280 lines
9.5 KiB
C++
Raw Blame History

/* Exception Handling interface routines.
Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
2007, 2008, 2009 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/>. */
#include "sbitmap.h"
#include "vecprim.h"
struct function;
/* The type of an exception region. */
enum eh_region_type
{
ERT_UNKNOWN = 0,
ERT_CLEANUP,
ERT_TRY,
ERT_CATCH,
ERT_ALLOWED_EXCEPTIONS,
ERT_MUST_NOT_THROW,
ERT_THROW
};
/* Describes one exception region. */
struct GTY(()) eh_region_d
{
/* The immediately surrounding region. */
struct eh_region_d *outer;
/* The list of immediately contained regions. */
struct eh_region_d *inner;
struct eh_region_d *next_peer;
/* List of regions sharing label. */
struct eh_region_d *next_region_sharing_label;
/* An identifier for this region. */
int region_number;
/* When a region is deleted, its parents inherit the REG_EH_REGION
numbers already assigned. */
bitmap aka;
/* Each region does exactly one thing. */
enum eh_region_type type;
/* Holds the action to perform based on the preceding type. */
union eh_region_u {
/* A list of catch blocks, a surrounding try block,
and the label for continuing after a catch. */
struct eh_region_u_try {
struct eh_region_d *eh_catch;
struct eh_region_d *last_catch;
} GTY ((tag ("ERT_TRY"))) eh_try;
/* The list through the catch handlers, the list of type objects
matched, and the list of associated filters. */
struct eh_region_u_catch {
struct eh_region_d *next_catch;
struct eh_region_d *prev_catch;
tree type_list;
tree filter_list;
} GTY ((tag ("ERT_CATCH"))) eh_catch;
/* A tree_list of allowed types. */
struct eh_region_u_allowed {
tree type_list;
int filter;
} GTY ((tag ("ERT_ALLOWED_EXCEPTIONS"))) allowed;
/* The type given by a call to "throw foo();", or discovered
for a throw. */
struct eh_region_u_throw {
tree type;
} GTY ((tag ("ERT_THROW"))) eh_throw;
} GTY ((desc ("%0.type"))) u;
/* Entry point for this region's handler before landing pads are built. */
rtx label;
tree tree_label;
/* Entry point for this region's handler from the runtime eh library. */
rtx landing_pad;
/* Entry point for this region's handler from an inner region. */
rtx post_landing_pad;
/* The RESX insn for handing off control to the next outermost handler,
if appropriate. */
rtx resume;
/* True if something in this region may throw. */
unsigned may_contain_throw : 1;
};
typedef struct eh_region_d *eh_region;
DEF_VEC_P(eh_region);
DEF_VEC_ALLOC_P(eh_region, gc);
DEF_VEC_ALLOC_P(eh_region, heap);
/* Per-function EH data. Used to save exception status for each
function. */
struct GTY(()) eh_status
{
/* The tree of all regions for this function. */
struct eh_region_d *region_tree;
/* The same information as an indexable array. */
VEC(eh_region,gc) *region_array;
int last_region_number;
htab_t GTY((param_is (struct throw_stmt_node))) throw_stmt_table;
};
/* Test: is exception handling turned on? */
extern int doing_eh (int);
/* Note that the current EH region (if any) may contain a throw, or a
call to a function which itself may contain a throw. */
extern void note_eh_region_may_contain_throw (struct eh_region_d *);
/* Invokes CALLBACK for every exception handler label. Only used by old
loop hackery; should not be used by new code. */
extern void for_each_eh_label (void (*) (rtx));
/* Invokes CALLBACK for every exception region in the current function. */
extern void for_each_eh_region (void (*) (struct eh_region_d *));
/* Determine if the given INSN can throw an exception. */
extern bool can_throw_internal_1 (int, bool, bool);
extern bool can_throw_internal (const_rtx);
extern bool can_throw_external_1 (int, bool, bool);
extern bool can_throw_external (const_rtx);
/* Set TREE_NOTHROW and cfun->all_throwers_are_sibcalls. */
extern unsigned int set_nothrow_function_flags (void);
extern void init_eh (void);
extern void init_eh_for_function (void);
extern rtx reachable_handlers (rtx);
extern void remove_eh_region (int);
extern void remove_eh_region_and_replace_by_outer_of (int, int);
extern void convert_from_eh_region_ranges (void);
extern unsigned int convert_to_eh_region_ranges (void);
extern void find_exception_handler_labels (void);
extern bool current_function_has_exception_handlers (void);
extern void output_function_exception_table (const char *);
extern void expand_builtin_unwind_init (void);
extern rtx expand_builtin_eh_return_data_regno (tree);
extern rtx expand_builtin_extract_return_addr (tree);
extern void expand_builtin_init_dwarf_reg_sizes (tree);
extern rtx expand_builtin_frob_return_addr (tree);
extern rtx expand_builtin_dwarf_sp_column (void);
extern void expand_builtin_eh_return (tree, tree);
extern void expand_eh_return (void);
extern rtx expand_builtin_extend_pointer (tree);
extern rtx get_exception_pointer (void);
extern rtx get_exception_filter (void);
typedef tree (*duplicate_eh_regions_map) (tree, void *);
extern int duplicate_eh_regions (struct function *, duplicate_eh_regions_map,
void *, int, int);
extern void sjlj_emit_function_exit_after (rtx);
extern void default_init_unwind_resume_libfunc (void);
extern struct eh_region_d *gen_eh_region_cleanup (struct eh_region_d *);
extern struct eh_region_d *gen_eh_region_try (struct eh_region_d *);
extern struct eh_region_d *gen_eh_region_catch (struct eh_region_d *, tree);
extern struct eh_region_d *gen_eh_region_allowed (struct eh_region_d *, tree);
extern struct eh_region_d *gen_eh_region_must_not_throw (struct eh_region_d *);
extern int get_eh_region_number (struct eh_region_d *);
extern bool get_eh_region_may_contain_throw (struct eh_region_d *);
extern tree get_eh_region_no_tree_label (int);
extern tree get_eh_region_tree_label (struct eh_region_d *);
extern void set_eh_region_tree_label (struct eh_region_d *, tree);
extern void foreach_reachable_handler (int, bool, bool,
void (*) (struct eh_region_d *, void *),
void *);
extern void collect_eh_region_array (void);
extern void expand_resx_stmt (gimple);
extern void verify_eh_tree (struct function *);
extern void dump_eh_tree (FILE *, struct function *);
void debug_eh_tree (struct function *);
extern int eh_region_outermost (struct function *, int, int);
extern void add_type_for_runtime (tree);
extern tree lookup_type_for_runtime (tree);
/* If non-NULL, this is a function that returns an expression to be
executed if an unhandled exception is propagated out of a cleanup
region. For example, in C++, an exception thrown by a destructor
during stack unwinding is required to result in a call to
`std::terminate', so the C++ version of this function returns a
CALL_EXPR for `std::terminate'. */
extern gimple (*lang_protect_cleanup_actions) (void);
/* Return true if type A catches type B. */
extern int (*lang_eh_type_covers) (tree a, tree b);
/* Map a type to a runtime object to match type. */
extern tree (*lang_eh_runtime_type) (tree);
/* Just because the user configured --with-sjlj-exceptions=no doesn't
mean that we can use call frame exceptions. Detect that the target
has appropriate support. */
#ifndef MUST_USE_SJLJ_EXCEPTIONS
# if defined (EH_RETURN_DATA_REGNO) \
&& (defined (TARGET_UNWIND_INFO) \
|| (DWARF2_UNWIND_INFO \
&& (defined (EH_RETURN_HANDLER_RTX) \
|| defined (HAVE_eh_return))))
# define MUST_USE_SJLJ_EXCEPTIONS 0
# else
# define MUST_USE_SJLJ_EXCEPTIONS 1
# endif
#endif
#ifdef CONFIG_SJLJ_EXCEPTIONS
# if CONFIG_SJLJ_EXCEPTIONS == 1
# define USING_SJLJ_EXCEPTIONS 1
# endif
# if CONFIG_SJLJ_EXCEPTIONS == 0
# define USING_SJLJ_EXCEPTIONS 0
# if !defined(EH_RETURN_DATA_REGNO)
#error "EH_RETURN_DATA_REGNO required"
# endif
# if ! (defined(TARGET_UNWIND_INFO) || DWARF2_UNWIND_INFO)
#error "{DWARF2,TARGET}_UNWIND_INFO required"
# endif
# if !defined(TARGET_UNWIND_INFO) \
&& !(defined(EH_RETURN_HANDLER_RTX) || defined(HAVE_eh_return))
#error "EH_RETURN_HANDLER_RTX or eh_return required"
# endif
/* Usually the above error checks will have already triggered an
error, but backends may set MUST_USE_SJLJ_EXCEPTIONS for their own
reasons. */
# if MUST_USE_SJLJ_EXCEPTIONS
#error "Must use SJLJ exceptions but configured not to"
# endif
# endif
#else
# define USING_SJLJ_EXCEPTIONS MUST_USE_SJLJ_EXCEPTIONS
#endif
struct GTY(()) throw_stmt_node {
gimple stmt;
int region_nr;
};
extern struct htab *get_eh_throw_stmt_table (struct function *);
extern void set_eh_throw_stmt_table (struct function *, struct htab *);
extern void remove_unreachable_regions (sbitmap, sbitmap);
extern VEC(int,heap) * label_to_region_map (void);
extern int num_eh_regions (void);
extern bitmap must_not_throw_labels (void);
extern struct eh_region_d *redirect_eh_edge_to_label (struct edge_def *, tree, bool, bool, int);
extern int get_next_region_sharing_label (int);
Reference in New Issue View Git Blame Copy Permalink