X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Fexcept.h;h=5d461d7000b651e1016561a8f2e44ffeccf487f9;hb=42f4cf9571f5131e674b578c4634979ea727b137;hp=1087bc1dcfe569e3c2a6ff5121781502a396239c;hpb=f929a98a102bd45c0cfd909caa136b1ea3e428b2;p=pf3gnuchains%2Fgcc-fork.git diff --git a/gcc/except.h b/gcc/except.h index 1087bc1dcfe..5d461d7000b 100644 --- a/gcc/except.h +++ b/gcc/except.h @@ -1,501 +1,340 @@ /* 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 . -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 +. */ + +/* 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. +/* A landing pad for a given exception region. Any transfer of control + from the EH runtime to the function happens at a landing pad. */ - 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. */ - -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; - /* 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 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)); - -/* 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. */ +typedef struct eh_landing_pad_d *eh_landing_pad; +typedef struct eh_catch_d *eh_catch; +typedef struct eh_region_d *eh_region; -extern tree top_label_entry PARAMS ((struct label_node **labelstack)); +DEF_VEC_P(eh_region); +DEF_VEC_ALLOC_P(eh_region, gc); +DEF_VEC_ALLOC_P(eh_region, heap); -#endif - -/* Test: is exception handling turned on? */ - -extern int doing_eh PARAMS ((int)); - -/* Toplevel initialization for EH. */ +DEF_VEC_P(eh_landing_pad); +DEF_VEC_ALLOC_P(eh_landing_pad, gc); -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. */ +/* The exception status for each function. */ -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)); - -/* 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; - -/* 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)