/* Exception Handling interface routines.
- Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
+ Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
+ 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
Contributed by Mike Stump <mrs@cygnus.com>.
-This file is part of GNU CC.
+This file is part of GCC.
-GNU CC is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
+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.
-GNU CC 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.
+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 GNU CC; see the file COPYING. If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
-
-#if !defined(NULL_RTX) && !defined(rtx)
-typedef struct rtx_def *_except_rtx;
-#define rtx _except_rtx
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
+
+/* No include guards here, but define an include file marker anyway, so
+ that the compiler can keep track of where this file is included. This
+ is e.g. used to avoid including this file in front-end specific files. */
+#ifndef GCC_EXCEPT_H
+# define GCC_EXCEPT_H
#endif
-#ifdef TREE_CODE
+#include "hashtab.h"
+#include "vecprim.h"
+#include "vecir.h"
-/* A stack of labels. CHAIN points to the next entry in the stack. */
+struct function;
+struct eh_region_d;
+struct pointer_map_t;
-struct label_node {
- union {
- rtx rlabel;
- tree tlabel;
- } u;
- struct label_node *chain;
+/* The type of an exception region. */
+enum eh_region_type
+{
+ /* CLEANUP regions implement e.g. destructors run when exiting a block.
+ They can be generated from both GIMPLE_TRY_FINALLY and GIMPLE_TRY_CATCH
+ nodes. It is expected by the runtime that cleanup regions will *not*
+ resume normal program flow, but will continue propagation of the
+ exception. */
+ ERT_CLEANUP,
+
+ /* TRY regions implement catching an exception. The list of types associated
+ with the attached catch handlers is examined in order by the runtime and
+ control is transfered to the appropriate handler. Note that a NULL type
+ list is a catch-all handler, and that it will catch *all* exceptions
+ including those originating from a different language. */
+ ERT_TRY,
+
+ /* ALLOWED_EXCEPTIONS regions implement exception filtering, e.g. the
+ throw(type-list) specification that can be added to C++ functions.
+ The runtime examines the thrown exception vs the type list, and if
+ the exception does not match, transfers control to the handler. The
+ normal handler for C++ calls __cxa_call_unexpected. */
+ ERT_ALLOWED_EXCEPTIONS,
+
+ /* MUST_NOT_THROW regions prevent all exceptions from propagating. This
+ region type is used in C++ to surround destructors being run inside a
+ CLEANUP region. This differs from an ALLOWED_EXCEPTIONS region with
+ an empty type list in that the runtime is prepared to terminate the
+ program directly. We only generate code for MUST_NOT_THROW regions
+ along control paths that are already handling an exception within the
+ current function. */
+ ERT_MUST_NOT_THROW
};
-/* An eh_entry is used to describe one exception handling region.
-
- OUTER_CONTEXT is the label used for rethrowing into the outer context.
-
- EXCEPTION_HANDLER_LABEL is the label corresponding to the handler
- for this region.
-
- LABEL_USED indicates whether a CATCH block has already used this
- label or not. New ones are needed for additional catch blocks if
- it has.
-
- FALSE_LABEL is used when either setjmp/longjmp exceptions are in
- use, or old style table exceptions. It contains the label for
- branching to the next runtime type check as handlers are processed.
-
- FINALIZATION is the tree codes for the handler, or is NULL_TREE if
- one hasn't been generated yet, or is integer_zero_node to mark the
- end of a group of try blocks. */
-
-struct eh_entry {
- rtx outer_context;
- rtx exception_handler_label;
- tree finalization;
- int label_used;
- rtx false_label;
- rtx rethrow_label;
- /* If non-zero, this entry is for a handler created when we left an
- exception-region via goto. */
- unsigned goto_entry_p : 1;
-};
-#else
-struct label_node;
-struct eh_entry;
-#endif
-/* A list of EH_ENTRYs. ENTRY is the entry; CHAIN points to the next
- entry in the list, or is NULL if this is the last entry. */
+/* A landing pad for a given exception region. Any transfer of control
+ from the EH runtime to the function happens at a landing pad. */
-struct eh_node {
- struct eh_entry *entry;
- struct eh_node *chain;
+struct GTY(()) eh_landing_pad_d
+{
+ /* The linked list of all landing pads associated with the region. */
+ struct eh_landing_pad_d *next_lp;
+
+ /* The region with which this landing pad is associated. */
+ struct eh_region_d *region;
+
+ /* At the gimple level, the location to which control will be transfered
+ for this landing pad. There can be both EH and normal edges into the
+ block containing the post-landing-pad label. */
+ tree post_landing_pad;
+
+ /* At the rtl level, the location to which the runtime will transfer
+ control. This differs from the post-landing-pad in that the target's
+ EXCEPTION_RECEIVER pattern will be expanded here, as well as other
+ bookkeeping specific to exceptions. There must not be normal edges
+ into the block containing the landing-pad label. */
+ rtx landing_pad;
+
+ /* The index of this landing pad within fun->eh->lp_array. */
+ int index;
};
-/* A stack of EH_ENTRYs. TOP is the topmost entry on the stack. TOP is
- NULL if the stack is empty. */
+/* A catch handler associated with an ERT_TRY region. */
-struct eh_stack {
- struct eh_node *top;
+struct GTY(()) eh_catch_d
+{
+ /* The double-linked list of all catch handlers for the region. */
+ struct eh_catch_d *next_catch;
+ struct eh_catch_d *prev_catch;
+
+ /* A TREE_LIST of runtime type objects that this catch handler
+ will catch, or NULL if all exceptions are caught. */
+ tree type_list;
+
+ /* A TREE_LIST of INTEGER_CSTs that correspond to the type_list entries,
+ having been mapped by assign_filter_values. These integers are to be
+ compared against the __builtin_eh_filter value. */
+ tree filter_list;
+
+ /* The code that should be executed if this catch handler matches the
+ thrown exception. This label is only maintained until
+ pass_lower_eh_dispatch, at which point it is cleared. */
+ tree label;
};
-/* A queue of EH_ENTRYs. HEAD is the front of the queue; TAIL is the
- end (the latest entry). HEAD and TAIL are NULL if the queue is
- empty. */
+/* Describes one exception region. */
-struct eh_queue {
- struct eh_node *head;
- struct eh_node *tail;
- struct eh_queue *next;
-};
-
-/* Used to save exception handling status for each function. */
-struct eh_status
+struct GTY(()) eh_region_d
{
- /* A stack used for keeping track of the currently active exception
- handling region. As each exception region is started, an entry
- describing the region is pushed onto this stack. The current
- region can be found by looking at the top of the stack, and as we
- exit regions, the corresponding entries are popped.
-
- Entries cannot overlap; they can be nested. So there is only one
- entry at most that corresponds to the current instruction, and that
- is the entry on the top of the stack. */
- struct eh_stack x_ehstack;
- /* This stack is used to represent what the current eh region is
- for the catch blocks beings processed */
- struct eh_stack x_catchstack;
- /* A queue used for tracking which exception regions have closed.
- As we exit a region, we enqueue a new entry. The entries are then
- dequeued during expand_leftover_cleanups and
- expand_start_all_catch. */
- struct eh_queue *x_ehqueue;
- /* Insns for all of the exception handlers for the current function.
- They are currently emitted by the frontend code. */
- rtx x_catch_clauses;
- /* End of exception handler insn sequence. */
- rtx x_catch_clauses_last;
- /* A random data area for the front end's own use. */
- struct label_node *x_false_label_stack;
- /* Keeps track of the label to resume to should one want to resume
- normal control flow out of a handler (instead of, say, returning to
- the caller of the current function or exiting the program). */
- struct label_node *x_caught_return_label_stack;
- /* A stack (TREE_LIST) of lists of handlers. The TREE_VALUE of each
- node is itself a TREE_CHAINed list of handlers for regions that
- are not yet closed. The TREE_VALUE of each entry contains the
- handler for the corresponding entry on the ehstack. */
- union tree_node *x_protect_list;
- /* The EH context. Nonzero if the function has already
- fetched a pointer to the EH context for exception handling. */
- rtx ehc;
- /* The label generated by expand_builtin_eh_return. */
- rtx x_eh_return_stub_label;
+ /* 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;
+
+ /* The index of this region within fun->eh->region_array. */
+ int index;
+
+ /* 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 {
+ struct eh_region_u_try {
+ /* The double-linked list of all catch handlers for this region. */
+ struct eh_catch_d *first_catch;
+ struct eh_catch_d *last_catch;
+ } GTY ((tag ("ERT_TRY"))) eh_try;
+
+ struct eh_region_u_allowed {
+ /* A TREE_LIST of runtime type objects allowed to pass. */
+ tree type_list;
+ /* The code that should be executed if the thrown exception does
+ not match the type list. This label is only maintained until
+ pass_lower_eh_dispatch, at which point it is cleared. */
+ tree label;
+ /* The integer that will be passed by the runtime to signal that
+ we should execute the code at LABEL. This integer is assigned
+ by assign_filter_values and is to be compared against the
+ __builtin_eh_filter value. */
+ int filter;
+ } GTY ((tag ("ERT_ALLOWED_EXCEPTIONS"))) allowed;
+
+ struct eh_region_u_must_not_throw {
+ /* A function decl to be invoked if this region is actually reachable
+ from within the function, rather than implementable from the runtime.
+ The normal way for this to happen is for there to be a CLEANUP region
+ contained within this MUST_NOT_THROW region. Note that if the
+ runtime handles the MUST_NOT_THROW region, we have no control over
+ what termination function is called; it will be decided by the
+ personality function in effect for this CIE. */
+ tree failure_decl;
+ /* The location assigned to the call of FAILURE_DECL, if expanded. */
+ location_t failure_loc;
+ } GTY ((tag ("ERT_MUST_NOT_THROW"))) must_not_throw;
+ } GTY ((desc ("%0.type"))) u;
+
+ /* The list of landing pads associated with this region. */
+ struct eh_landing_pad_d *landing_pads;
+
+ /* EXC_PTR and FILTER values copied from the runtime for this region.
+ Each region gets its own psuedos so that if there are nested exceptions
+ we do not overwrite the values of the first exception. */
+ rtx exc_ptr_reg, filter_reg;
+
+ /* True if this region should use __cxa_end_cleanup instead
+ of _Unwind_Resume. */
+ bool use_cxa_end_cleanup;
};
-#define ehstack (cfun->eh->x_ehstack)
-#define catchstack (cfun->eh->x_catchstack)
-#define ehqueue (cfun->eh->x_ehqueue)
-#define catch_clauses (cfun->eh->x_catch_clauses)
-#define catch_clauses_last (cfun->eh->x_catch_clauses_last)
-#define false_label_stack (cfun->eh->x_false_label_stack)
-#define caught_return_label_stack (cfun->eh->x_caught_return_label_stack)
-#define protect_list (cfun->eh->x_protect_list)
-#define current_function_ehc (cfun->eh->ehc)
-#define eh_return_stub_label (cfun->eh->x_eh_return_stub_label)
-
-#ifdef TREE_CODE
-/* Start an exception handling region. All instructions emitted after
- this point are considered to be part of the region until
- expand_eh_region_end () is invoked. */
-
-extern void expand_eh_region_start PARAMS ((void));
+typedef struct eh_landing_pad_d *eh_landing_pad;
+typedef struct eh_catch_d *eh_catch;
+typedef struct eh_region_d *eh_region;
-/* Just like expand_eh_region_start, except if a cleanup action is
- entered on the cleanup chain, the TREE_PURPOSE of the element put
- on the chain is DECL. DECL should be the associated VAR_DECL, if
- any, otherwise it should be NULL_TREE. */
-
-extern void expand_eh_region_start_for_decl PARAMS ((tree));
-
-/* Start an exception handling region for the given cleanup action.
- All instructions emitted after this point are considered to be part
- of the region until expand_eh_region_end () is invoked. CLEANUP is
- the cleanup action to perform. The return value is true if the
- exception region was optimized away. If that case,
- expand_eh_region_end does not need to be called for this cleanup,
- nor should it be.
-
- This routine notices one particular common case in C++ code
- generation, and optimizes it so as to not need the exception
- region. */
-
-extern int expand_eh_region_start_tree PARAMS ((tree, tree));
-
-/* End an exception handling region. The information about the region
- is found on the top of ehstack.
-
- HANDLER is either the cleanup for the exception region, or if we're
- marking the end of a try block, HANDLER is integer_zero_node.
-
- HANDLER will be transformed to rtl when expand_leftover_cleanups ()
- is invoked. */
-
-extern void expand_eh_region_end PARAMS ((tree));
-
-/* Push RLABEL or TLABEL onto LABELSTACK. Only one of RLABEL or TLABEL
- should be set; the other must be NULL. */
-
-extern void push_label_entry PARAMS ((struct label_node **labelstack,
- rtx rlabel, tree tlabel));
-
-/* Pop the topmost entry from LABELSTACK and return its value as an
- rtx node. If LABELSTACK is empty, return NULL. */
-
-extern rtx pop_label_entry PARAMS ((struct label_node **labelstack));
-
-/* Return the topmost entry of LABELSTACK as a tree node, or return
- NULL_TREE if LABELSTACK is empty. */
-
-extern tree top_label_entry PARAMS ((struct label_node **labelstack));
-
-#endif
+DEF_VEC_P(eh_region);
+DEF_VEC_ALLOC_P(eh_region, gc);
+DEF_VEC_ALLOC_P(eh_region, heap);
-/* Test: is exception handling turned on? */
+DEF_VEC_P(eh_landing_pad);
+DEF_VEC_ALLOC_P(eh_landing_pad, gc);
-extern int doing_eh PARAMS ((int));
-/* Toplevel initialization for EH. */
+/* The exception status for each function. */
-void set_exception_lang_code PARAMS ((int));
-void set_exception_version_code PARAMS ((int));
-
-/* A list of handlers asocciated with an exception region. HANDLER_LABEL
- is the the label that control should be transfered to if the data
- in TYPE_INFO matches an exception. a value of NULL_TREE for TYPE_INFO
- means This is a cleanup, and must always be called. A value of
- CATCH_ALL_TYPE works like a cleanup, but a call to the runtime matcher
- is still performed to avoid being caught by a different language
- exception. NEXT is a pointer to the next handler for this region.
- NULL means there are no more. */
-
-typedef struct handler_info
+struct GTY(()) eh_status
{
- rtx handler_label;
- int handler_number;
- void *type_info;
- struct handler_info *next;
-} handler_info;
+ /* The tree of all regions for this function. */
+ eh_region region_tree;
+
+ /* The same information as an indexable array. */
+ VEC(eh_region,gc) *region_array;
+
+ /* The landing pads as an indexable array. */
+ VEC(eh_landing_pad,gc) *lp_array;
+
+ /* At the gimple level, a mapping from gimple statement to landing pad
+ or must-not-throw region. See record_stmt_eh_region. */
+ htab_t GTY((param_is (struct throw_stmt_node))) throw_stmt_table;
+
+ /* All of the runtime type data used by the function. These objects
+ are emitted to the lang-specific-data-area for the function. */
+ VEC(tree,gc) *ttype_data;
+
+ /* The table of all action chains. These encode the eh_region tree in
+ a compact form for use by the runtime, and is also emitted to the
+ lang-specific-data-area. Note that the ARM EABI uses a different
+ format for the encoding than all other ports. */
+ union eh_status_u {
+ VEC(tree,gc) * GTY((tag ("1"))) arm_eabi;
+ VEC(uchar,gc) * GTY((tag ("0"))) other;
+ } GTY ((desc ("targetm.arm_eabi_unwinder"))) ehspec_data;
+};
-/* Add new handler information to an exception range. The first parameter
- specifies the range number (returned from new_eh_entry()). The second
- parameter specifies the handler. By default the handler is inserted at
- the end of the list. A handler list may contain only ONE NULL_TREE
- typeinfo entry. Regardless where it is positioned, a NULL_TREE entry
- is always output as the LAST handler in the exception table for a region. */
+/* 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));
-void add_new_handler PARAMS ((int, struct handler_info *));
+extern void init_eh_for_function (void);
-/* Remove a handler label. The handler label is being deleted, so all
- regions which reference this handler should have it removed from their
- list of possible handlers. Any region which has the final handler
- removed can be deleted. */
+extern void remove_eh_landing_pad (eh_landing_pad);
+extern void remove_eh_handler (eh_region);
-void remove_handler PARAMS ((rtx));
+extern bool current_function_has_exception_handlers (void);
+extern void output_function_exception_table (const char *);
-/* Create a new handler structure initialized with the handler label and
- typeinfo fields passed in. */
+extern rtx expand_builtin_eh_pointer (tree);
+extern rtx expand_builtin_eh_filter (tree);
+extern rtx expand_builtin_eh_copy_values (tree);
+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 void expand_dw2_landing_pad_for_region (eh_region);
-struct handler_info *get_new_handler PARAMS ((rtx, void *));
+typedef tree (*duplicate_eh_regions_map) (tree, void *);
+extern struct pointer_map_t *duplicate_eh_regions
+ (struct function *, eh_region, int, duplicate_eh_regions_map, void *);
-/* Make a duplicate of an exception region by copying all the handlers
- for an exception region. Return the new handler index. */
+extern void sjlj_emit_function_exit_after (rtx);
-int duplicate_eh_handlers PARAMS ((int, int, rtx (*)(rtx)));
+extern eh_region gen_eh_region_cleanup (eh_region);
+extern eh_region gen_eh_region_try (eh_region);
+extern eh_region gen_eh_region_allowed (eh_region, tree);
+extern eh_region gen_eh_region_must_not_throw (eh_region);
-/* map symbol refs for rethrow */
+extern eh_catch gen_eh_region_catch (eh_region, tree);
+extern eh_landing_pad gen_eh_landing_pad (eh_region);
-rtx rethrow_symbol_map PARAMS ((rtx, rtx (*)(rtx)));
+extern eh_region get_eh_region_from_number_fn (struct function *, int);
+extern eh_region get_eh_region_from_number (int);
+extern eh_landing_pad get_eh_landing_pad_from_number_fn (struct function*,int);
+extern eh_landing_pad get_eh_landing_pad_from_number (int);
+extern eh_region get_eh_region_from_lp_number_fn (struct function *, int);
+extern eh_region get_eh_region_from_lp_number (int);
-/* Is the rethrow label for a region used? */
+extern eh_region eh_region_outermost (struct function *, eh_region, eh_region);
-int rethrow_used PARAMS ((int));
+extern void make_reg_eh_region_note (rtx insn, int ecf_flags, int lp_nr);
+extern void make_reg_eh_region_note_nothrow_nononlocal (rtx);
-/* Update the rethrow references to reflect rethrows which have been
- optimized away. */
+extern void verify_eh_tree (struct function *);
+extern void dump_eh_tree (FILE *, struct function *);
+void debug_eh_tree (struct function *);
+extern void add_type_for_runtime (tree);
+extern tree lookup_type_for_runtime (tree);
+extern void assign_filter_values (void);
-void update_rethrow_references PARAMS ((void));
+extern eh_region get_eh_region_from_rtx (const_rtx);
+extern eh_landing_pad get_eh_landing_pad_from_rtx (const_rtx);
-/* Get a pointer to the first handler in an exception region's list. */
+struct GTY(()) throw_stmt_node {
+ gimple stmt;
+ int lp_nr;
+};
-struct handler_info *get_first_handler PARAMS ((int));
+extern struct htab *get_eh_throw_stmt_table (struct function *);
+extern void set_eh_throw_stmt_table (struct function *, struct htab *);
-/* Find all the runtime handlers type matches currently referenced */
+enum eh_personality_kind {
+ eh_personality_none,
+ eh_personality_any,
+ eh_personality_lang
+};
-int find_all_handler_type_matches PARAMS ((void ***));
+extern enum eh_personality_kind
+function_needs_eh_personality (struct function *);
-/* The eh_nesting_info structure is used to find a list of valid handlers
- for any arbitrary exception region. When init_eh_nesting_info is called,
- the information is all pre-calculated and entered in this structure.
- REGION_INDEX is a vector over all possible region numbers. Since the
- number of regions is typically much smaller than the range of block
- numbers, this is a sparse vector and the other data structures are
- represented as dense vectors. Indexed with an exception region number, this
- returns the index to use in the other data structures to retreive the
- correct information.
- HANDLERS is an array of vectors which point to handler_info structures.
- when indexed, it gives the list of all possible handlers which can
- be reached by a throw from this exception region.
- NUM_HANDLERS is the equivilent array indicating how many handler
- pointers there are in the HANDLERS vector.
- OUTER_INDEX indicates which index represents the information for the
- outer block. 0 indicates there is no outer context.
- REGION_COUNT is the number of regions. */
+/* Pre-order iteration within the eh_region tree. */
-typedef struct eh_nesting
+static inline eh_region
+ehr_next (eh_region r, eh_region start)
{
- int *region_index;
- handler_info ***handlers;
- int *num_handlers;
- int *outer_index;
- int region_count;
-} eh_nesting_info;
-
-/* Initialize the eh_nesting_info structure. */
-
-eh_nesting_info *init_eh_nesting_info PARAMS ((void));
-
-/* Get a list of handlers reachable from a an exception region/insn. */
-
-int reachable_handlers PARAMS ((int, eh_nesting_info *, rtx,
- handler_info ***handlers));
-
-/* Free the eh_nesting_info structure. */
-
-void free_eh_nesting_info PARAMS ((eh_nesting_info *));
-
-extern void init_eh PARAMS ((void));
-
-/* Initialization for the per-function EH data. */
-
-extern void init_eh_for_function PARAMS ((void));
-
-/* Generate an exception label. Use instead of gen_label_rtx */
-
-extern rtx gen_exception_label PARAMS ((void));
-
-/* Adds an EH table entry for EH entry number N. Called from
- final_scan_insn for NOTE_INSN_EH_REGION_BEG. */
-
-extern void add_eh_table_entry PARAMS ((int n));
-
-/* Start a catch clause, triggered by runtime value paramter. */
-
-#ifdef TREE_CODE
-extern void start_catch_handler PARAMS ((tree));
-#endif
-
-/* End an individual catch clause. */
-
-extern void end_catch_handler PARAMS ((void));
-
-/* Returns a non-zero value if we need to output an exception table. */
-
-extern int exception_table_p PARAMS ((void));
-
-/* Outputs the exception table if we have one. */
-
-extern void output_exception_table PARAMS ((void));
-extern void output_exception_table_data PARAMS ((void));
-
-/* Free the exception table. */
-
-extern void free_exception_table PARAMS((void));
-
-/* Used by the ia64 unwind format to output data for an individual
- function. */
-
-extern void output_function_exception_table PARAMS((void));
-
-/* Given a return address in ADDR, determine the address we should use
- to find the corresponding EH region. */
-
-extern rtx eh_outer_context PARAMS ((rtx addr));
-
-/* Called at the start of a block of try statements for which there is
- a supplied catch handler. */
-
-extern void expand_start_try_stmts PARAMS ((void));
-
-/* Called at the start of a block of catch statements. It terminates the
- previous set of try statements. */
-
-extern void expand_start_all_catch PARAMS ((void));
-
-/* Called at the end of a block of catch statements. */
-
-extern void expand_end_all_catch PARAMS ((void));
-
-/* Begin a region that will contain entries created with
- add_partial_entry. */
-
-extern void begin_protect_partials PARAMS ((void));
-
-#ifdef TREE_CODE
-/* Create a new exception region and add the handler for the region
- onto a list. These regions will be ended (and their handlers
- emitted) when end_protect_partials is invoked. */
-
-extern void add_partial_entry PARAMS ((tree handler));
-#endif
-
-/* End all of the pending exception regions that have handlers added with
- push_protect_entry (). */
-
-extern void end_protect_partials PARAMS ((void));
-
-/* An internal throw. */
-
-extern void expand_internal_throw PARAMS ((void));
-
-/* Called from expand_exception_blocks and expand_end_catch_block to
- expand and pending handlers. */
-
-extern void expand_leftover_cleanups PARAMS ((void));
-
-/* If necessary, emit insns to get EH context for the current
- function. */
-
-extern void emit_eh_context PARAMS ((void));
-
-/* Builds a list of handler labels and puts them in the global
- variable exception_handler_labels. */
-
-extern void find_exception_handler_labels PARAMS ((void));
-
-/* Determine if an arbitrary label is an exception label */
-
-extern int is_exception_handler_label PARAMS ((int));
-
-/* Performs sanity checking on the check_exception_handler_labels
- list. */
-
-extern void check_exception_handler_labels PARAMS ((void));
-
-/* Keeps track of the label used as the context of a throw to rethrow an
- exception to the outer exception region. */
-
-extern struct label_node *outer_context_label_stack;
-
-/* A list of labels used for exception handlers. It is created by
- find_exception_handler_labels for the optimization passes. */
-
-extern rtx exception_handler_labels;
-
-/* Determine if the given INSN can throw an exception. */
-
-extern int can_throw PARAMS ((rtx));
-
-/* Return nonzero if nothing in this function can throw. */
-
-extern int nothrow_function_p PARAMS ((void));
-
-/* Performs optimizations for exception handling, such as removing
- unnecessary exception regions. Invoked from jump_optimize (). */
-
-extern void exception_optimize PARAMS ((void));
-
-/* Return EH context (and set it up once per fn). */
-extern rtx get_eh_context PARAMS ((void));
-
-/* Get the dynamic handler chain. */
-extern rtx get_dynamic_handler_chain PARAMS ((void));
-
-/* Get the dynamic cleanup chain. */
-extern rtx get_dynamic_cleanup_chain PARAMS ((void));
-
-/* Throw an exception. */
-
-extern void emit_throw PARAMS ((void));
-
-/* Save away the current ehqueue. */
-extern void push_ehqueue PARAMS ((void));
-
-/* Restore a previously pushed ehqueue. */
-extern void pop_ehqueue PARAMS ((void));
-
-/* One to use setjmp/longjmp method of generating code. */
-
-extern int exceptions_via_longjmp;
-
-/* One to enable asynchronous exception support. */
-
-extern int asynchronous_exceptions;
-
-/* One to protect cleanup actions with a handler that calls
- __terminate, zero otherwise. */
-
-extern int protect_cleanup_actions_with_terminate;
-
-#ifdef TREE_CODE
-extern tree protect_with_terminate PARAMS ((tree));
-#endif
-
-extern void expand_fixup_region_start PARAMS ((void));
-#ifdef TREE_CODE
-extern void expand_fixup_region_end PARAMS ((tree));
-#endif
-
-/* Various hooks for the DWARF 2 __throw routine. */
-
-void expand_builtin_unwind_init PARAMS ((void));
-rtx expand_builtin_dwarf_fp_regnum PARAMS ((void));
-#ifdef TREE_CODE
-rtx expand_builtin_frob_return_addr PARAMS ((tree));
-rtx expand_builtin_extract_return_addr PARAMS ((tree));
-void expand_builtin_init_dwarf_reg_sizes PARAMS ((tree));
-void expand_builtin_eh_return PARAMS ((tree, tree, tree));
-#endif
-void expand_eh_return PARAMS ((void));
-
-
-/* Checking whether 2 instructions are within the same exception region. */
-
-int in_same_eh_region PARAMS ((rtx, rtx));
-void free_insn_eh_region PARAMS ((void));
-void init_insn_eh_region PARAMS ((rtx, int));
-
-#ifdef rtx
-#undef rtx
-#endif
+ if (r->inner)
+ r = r->inner;
+ else if (r->next_peer && r != start)
+ r = r->next_peer;
+ else
+ {
+ do
+ {
+ r = r->outer;
+ if (r == start)
+ return NULL;
+ }
+ while (r->next_peer == NULL);
+ r = r->next_peer;
+ }
+ return r;
+}
+
+#define FOR_ALL_EH_REGION_AT(R, START) \
+ for ((R) = (START); (R) != NULL; (R) = ehr_next (R, START))
+
+#define FOR_ALL_EH_REGION_FN(R, FN) \
+ for ((R) = (FN)->eh->region_tree; (R) != NULL; (R) = ehr_next (R, NULL))
+
+#define FOR_ALL_EH_REGION(R) FOR_ALL_EH_REGION_FN (R, cfun)
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