X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Fexcept.h;h=ce91051d5b1637ab551b14a5627092b91794d171;hb=0afe563d3f860ea4cf7a22fef1ebc47e1b3f2c86;hp=0356bd398e929b5ef614f6f177feabc1347b5806;hpb=bfad8f20e9528738c47cdfdfc38251ba2016b332;p=pf3gnuchains%2Fgcc-fork.git diff --git a/gcc/except.h b/gcc/except.h index 0356bd398e9..ce91051d5b1 100644 --- a/gcc/except.h +++ b/gcc/except.h @@ -1,301 +1,183 @@ /* Exception Handling interface routines. - Copyright (C) 1996, 1997 Free Software Foundation, Inc. + Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002 + 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 2, 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. */ +along with GCC; 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 * +#ifndef GCC_VARRAY_H +struct varray_head_tag; +#define varray_type struct varray_head_tag * #endif -#ifdef TREE_CODE +struct function; -/* A stack of labels. CHAIN points to the next entry in the stack. */ +struct inline_remap; -struct label_node { - union { - rtx rlabel; - tree tlabel; - } u; - struct label_node *chain; -}; +/* Per-function EH data. Used only in except.c, but GC and others + manipulate pointers to the opaque type. */ +struct eh_status; -/* 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; -}; +/* Internal structure describing a region. */ +struct eh_region; +/* Test: is exception handling turned on? */ +extern int doing_eh PARAMS ((int)); /* 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; - + this point are considered to be part of the region until an + expand_eh_region_end variant is invoked. */ +extern void expand_eh_region_start PARAMS ((void)); + +/* End an exception handling region for a cleanup. HANDLER is an + expression to expand for the cleanup. */ +extern void expand_eh_region_end_cleanup PARAMS ((tree)); + +/* End an exception handling region for a try block, and prepares + for subsequent calls to expand_start_catch. */ +extern void expand_start_all_catch PARAMS ((void)); + +/* Begin a catch clause. TYPE is an object to be matched by the + runtime, or a list of such objects, or null if this is a catch-all + clause. */ +extern void expand_start_catch PARAMS ((tree)); + +/* End a catch clause. Control will resume after the try/catch block. */ +extern void expand_end_catch PARAMS ((void)); + +/* End a sequence of catch handlers for a try block. */ +extern void expand_end_all_catch PARAMS ((void)); + +/* End an exception region for an exception type filter. ALLOWED is a + TREE_LIST of TREE_VALUE objects to be matched by the runtime. + FAILURE is a function to invoke if a mismatch occurs. */ +extern void expand_eh_region_end_allowed PARAMS ((tree, tree)); + +/* End an exception region for a must-not-throw filter. FAILURE is a + function to invoke if an uncaught exception propagates this far. */ +extern void expand_eh_region_end_must_not_throw PARAMS ((tree)); + +/* End an exception region for a throw. No handling goes on here, + but it's the easiest way for the front-end to indicate what type + is being thrown. */ +extern void expand_eh_region_end_throw PARAMS ((tree)); + +/* End a fixup region. Within this region the cleanups for the immediately + enclosing region are _not_ run. This is used for goto cleanup to avoid + destroying an object twice. */ +extern void expand_eh_region_end_fixup PARAMS ((tree)); + +/* 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 PARAMS ((void (*) (rtx))); + +/* Determine if the given INSN can throw an exception. */ +extern bool can_throw_internal PARAMS ((rtx)); +extern bool can_throw_external PARAMS ((rtx)); + +/* Return nonzero if nothing in this function can throw. */ +extern bool nothrow_function_p PARAMS ((void)); + +/* After initial rtl generation, call back to finish generating + exception support code. */ +extern void finish_eh_generation PARAMS ((void)); + +extern void init_eh PARAMS ((void)); +extern void init_eh_for_function PARAMS ((void)); + +extern rtx reachable_handlers PARAMS ((rtx)); +extern void maybe_remove_eh_handler PARAMS ((rtx)); + +extern void convert_from_eh_region_ranges PARAMS ((void)); +extern void convert_to_eh_region_ranges PARAMS ((void)); +extern void find_exception_handler_labels PARAMS ((void)); +extern bool current_function_has_exception_handlers PARAMS ((void)); +extern void output_function_exception_table PARAMS ((void)); + +extern void expand_builtin_unwind_init PARAMS ((void)); +extern rtx expand_builtin_eh_return_data_regno PARAMS ((tree)); +extern rtx expand_builtin_extract_return_addr PARAMS ((tree)); +extern void expand_builtin_init_dwarf_reg_sizes PARAMS ((tree)); +extern rtx expand_builtin_frob_return_addr PARAMS ((tree)); +extern rtx expand_builtin_dwarf_fp_regnum PARAMS ((void)); +extern void expand_builtin_eh_return PARAMS ((tree, tree)); +extern void expand_eh_return PARAMS ((void)); +extern rtx get_exception_pointer PARAMS ((struct function *)); +extern int duplicate_eh_regions PARAMS ((struct function *, + struct inline_remap *)); + +extern void sjlj_emit_function_exit_after PARAMS ((rtx)); + + +/* 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 tree (*lang_protect_cleanup_actions) PARAMS ((void)); + +/* Return true if type A catches type B. */ +extern int (*lang_eh_type_covers) PARAMS ((tree a, tree b)); + +/* Map a type to a runtime object to match type. */ +extern tree (*lang_eh_runtime_type) PARAMS ((tree)); + +#ifndef GCC_VARRAY_H +#undef varray_type #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. */ +/* 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. */ -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)); -#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. */ - -extern void expand_internal_throw PROTO((void)); - -/* 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 to get EH context for the current - function. */ - -extern void emit_eh_context 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; - -/* 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 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; - -/* Performs optimizations for exception handling, such as removing - unnecessary exception regions. Invoked from jump_optimize (). */ - -extern void exception_optimize PROTO((void)); - -/* Return EH context (and set it up once per fn). */ -extern rtx get_eh_context 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)); +#if ! (defined (EH_RETURN_DATA_REGNO) \ + && (defined (IA64_UNWIND_INFO) \ + || (DWARF2_UNWIND_INFO \ + && defined (EH_RETURN_STACKADJ_RTX) \ + && (defined (EH_RETURN_HANDLER_RTX) \ + || defined (HAVE_eh_return))))) +#define MUST_USE_SJLJ_EXCEPTIONS 1 +#else +#define MUST_USE_SJLJ_EXCEPTIONS 0 #endif -/* 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)); +#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 +# ifndef EH_RETURN_DATA_REGNO + #error "EH_RETURN_DATA_REGNO required" +# endif +# ifndef EH_RETURN_STACKADJ_RTX + #error "EH_RETURN_STACKADJ_RTX required" +# endif +# if !defined(EH_RETURN_HANDLER_RTX) && !defined(HAVE_eh_return) + #error "EH_RETURN_HANDLER_RTX or eh_return required" +# endif +# if !defined(DWARF2_UNWIND_INFO) && !defined(IA64_UNWIND_INFO) + #error "{DWARF2,IA64}_UNWIND_INFO required" +# endif +# endif +#else +# define USING_SJLJ_EXCEPTIONS MUST_USE_SJLJ_EXCEPTIONS #endif - - -/* Checking whether 2 instructions are within the same exception region. */ - -int in_same_eh_region PROTO((rtx, rtx)); -void free_insn_eh_region PROTO((void)); -void init_insn_eh_region PROTO((rtx, int));