X-Git-Url: http://git.sourceforge.jp/view?p=pf3gnuchains%2Fgcc-fork.git;a=blobdiff_plain;f=gcc%2Fexcept.h;h=8f9efb263829058bcbf953b14554ba06171c35f0;hp=5a65100d4aa29d928ad474a3cf5eb174af7bbd56;hb=2c3933b87b056dce86c72fc95813f10d528e1a50;hpb=0dbd1c7442aeabc3e63daf6f70f8fb136f0cf38e diff --git a/gcc/except.h b/gcc/except.h index 5a65100d4aa..8f9efb26382 100644 --- a/gcc/except.h +++ b/gcc/except.h @@ -1,286 +1,176 @@ /* Exception Handling interface routines. - Copyright (C) 1996, 1997 Free Software Foundation, Inc. + Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, + 2007 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. */ - - -#ifndef GET_CODE -#define rtx int * -#endif - -#ifdef TREE_CODE - -/* A stack of labels. CHAIN points to the next entry in the stack. */ - -struct label_node { - union { - rtx rlabel; - tree tlabel; - } u; - struct label_node *chain; -}; - -/* 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. - - 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; -}; - -/* 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; -}; - -/* A stack of EH_ENTRYs. TOP is the topmost entry on the stack. TOP is - NULL if the stack is empty. */ - -struct eh_stack { - struct eh_node *top; -}; - -/* 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. */ - -struct eh_queue { - struct eh_node *head; - struct eh_node *tail; -}; - - -/* 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 PROTO((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 PROTO((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 PROTO((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 PROTO((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 PROTO((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 PROTO((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 PROTO((struct label_node **labelstack)); - -/* A set of insns for the catch clauses in the current function. They - will be emitted at the end of the current function. */ - -extern rtx catch_clauses; - +along with GCC; see the file COPYING3. If not see +. */ + + +struct function; + +/* Per-function EH data. Used only in except.c, but GC and others + manipulate pointers to the opaque type. */ +struct eh_status; + +/* Internal structure describing a region. */ +struct eh_region; + +/* 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 *); + +/* 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 *)); + +/* Determine if the given INSN can throw an exception. */ +extern bool can_throw_internal_1 (int, bool); +extern bool can_throw_internal (const_rtx); +extern bool can_throw_external_1 (int, 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); + +/* After initial rtl generation, call back to finish generating + exception support code. */ +extern void finish_eh_generation (void); + +extern void init_eh (void); +extern void init_eh_for_function (void); + +extern rtx reachable_handlers (rtx); +extern void maybe_remove_eh_handler (rtx); + +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 *gen_eh_region_cleanup (struct eh_region *, + struct eh_region *); +extern struct eh_region *gen_eh_region_try (struct eh_region *); +extern struct eh_region *gen_eh_region_catch (struct eh_region *, tree); +extern struct eh_region *gen_eh_region_allowed (struct eh_region *, tree); +extern struct eh_region *gen_eh_region_must_not_throw (struct eh_region *); +extern int get_eh_region_number (struct eh_region *); +extern bool get_eh_region_may_contain_throw (struct eh_region *); +extern tree get_eh_region_tree_label (struct eh_region *); +extern void set_eh_region_tree_label (struct eh_region *, tree); + +extern void foreach_reachable_handler (int, bool, + void (*) (struct eh_region *, void *), + void *); + +extern void collect_eh_region_array (void); +extern void expand_resx_expr (tree); +extern void verify_eh_tree (struct function *); +extern void dump_eh_tree (FILE *, struct function *); +extern bool eh_region_outer_p (struct function *, int, int); +extern int eh_region_outermost (struct function *, int, int); + +/* 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 -/* Toplevel initialization for EH. */ - -extern void init_eh PROTO((void)); - -/* Initialization for the per-function EH data. */ - -extern void init_eh_for_function PROTO((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 PROTO((int n)); - -/* Returns a non-zero value if we need to output an exception table. */ - -extern int exception_table_p PROTO((void)); - -/* Outputs the exception table if we have one. */ - -extern void output_exception_table PROTO((void)); - -/* Given a return address in ADDR, determine the address we should use - to find the corresponding EH region. */ - -extern rtx eh_outer_context PROTO((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 PROTO((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 PROTO((void)); - -/* Called at the end of a block of catch statements. */ - -extern void expand_end_all_catch PROTO((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 PROTO((tree handler)); +#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 -/* End all of the pending exception regions that have handlers added with - push_protect_entry (). */ - -extern void end_protect_partials PROTO((void)); - -/* An internal throw with a direct CONTEXT we want to throw - from. CONTEXT must be a label. */ - -extern void expand_internal_throw PROTO((rtx context)); - -/* Called from expand_exception_blocks and expand_end_catch_block to - expand and pending handlers. */ - -extern void expand_leftover_cleanups PROTO((void)); - -/* If necessary, emit insns for the start of per-function unwinder for - the current function. */ - -extern void emit_unwinder PROTO((void)); - -/* If necessary, emit insns for the end of the per-function unwinder - for the current function. */ - -extern void end_eh_unwinder PROTO((void)); - -/* Builds a list of handler labels and puts them in the global - variable exception_handler_labels. */ - -extern void find_exception_handler_labels PROTO((void)); - -/* Performs sanity checking on the check_exception_handler_labels - list. */ - -extern void check_exception_handler_labels PROTO((void)); - -/* A stack used to keep track of the label used to resume normal program - flow out of the current exception handler region. */ - -extern struct label_node *caught_return_label_stack; - -/* A random area used for purposes elsewhere. */ - -extern struct label_node *false_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; - -/* The rtx for the saved PC value. */ - -extern rtx eh_saved_pc_rtx; - -/* Performs optimizations for exception handling, such as removing - unnecessary exception regions. Invoked from jump_optimize (). */ - -extern void exception_optimize PROTO((void)); - -/* Get the dynamic handler chain. */ -extern rtx get_dynamic_handler_chain PROTO((void)); - -/* Get the dynamic cleanup chain. */ -extern rtx get_dynamic_cleanup_chain PROTO((void)); - -/* Throw an exception. */ - -extern void emit_throw PROTO((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 PROTO((tree)); -#endif +struct throw_stmt_node GTY(()) +{ + gimple stmt; + int region_nr; +}; -/* Various hooks for the DWARF 2 __throw routine. */ - -void expand_builtin_unwind_init PROTO((void)); -rtx expand_builtin_dwarf_fp_regnum PROTO((void)); -rtx expand_builtin_eh_stub PROTO((void)); -#ifdef TREE_CODE -rtx expand_builtin_frob_return_addr PROTO((tree)); -rtx expand_builtin_extract_return_addr PROTO((tree)); -void expand_builtin_set_return_addr_reg PROTO((tree)); -void expand_builtin_set_eh_regs PROTO((tree, tree)); -rtx expand_builtin_dwarf_reg_size PROTO((tree, rtx)); -#endif +extern struct htab *get_eh_throw_stmt_table (struct function *); +extern void set_eh_throw_stmt_table (struct function *, struct htab *);