X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Fexcept.h;h=ce91051d5b1637ab551b14a5627092b91794d171;hb=0afe563d3f860ea4cf7a22fef1ebc47e1b3f2c86;hp=c02507c8e37b4d6346084b8db0aac1e51fb38b99;hpb=fbba54631f02b92620667b67c43449360a2e1eb6;p=pf3gnuchains%2Fgcc-fork.git diff --git a/gcc/except.h b/gcc/except.h index c02507c8e37..ce91051d5b1 100644 --- a/gcc/except.h +++ b/gcc/except.h @@ -1,513 +1,183 @@ /* Exception Handling interface routines. - Copyright (C) 1996, 1997, 1998, 1999, 2000 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. */ -#if !defined(NULL_RTX) && !defined(rtx) -typedef struct rtx_def *_except_rtx; -#define rtx _except_rtx -#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. - - 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; +#ifndef GCC_VARRAY_H +struct varray_head_tag; +#define varray_type struct varray_head_tag * #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; -}; - -/* 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; - struct eh_queue *next; -}; - -/* Used to save exception handling status for each function. */ -struct eh_status -{ - /* 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; -}; - -#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)); - -/* 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)); +struct function; -/* 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. +struct inline_remap; - This routine notices one particular common case in C++ code - generation, and optimizes it so as to not need the exception - region. */ +/* Per-function EH data. Used only in except.c, but GC and others + manipulate pointers to the opaque type. */ +struct eh_status; -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 - -/* Test: is exception handling turned on? */ +/* Internal structure describing a region. */ +struct eh_region; +/* Test: is exception handling turned on? */ extern int doing_eh PARAMS ((int)); -/* Toplevel initialization for EH. */ - -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 -{ - rtx handler_label; - int handler_number; - void *type_info; - struct handler_info *next; -} handler_info; - - -/* 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. */ - -void add_new_handler PARAMS ((int, struct handler_info *)); - -/* 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. */ - -void remove_handler PARAMS ((rtx)); - -/* Create a new handler structure initialized with the handler label and - typeinfo fields passed in. */ - -struct handler_info *get_new_handler PARAMS ((rtx, void *)); - -/* Make a duplicate of an exception region by copying all the handlers - for an exception region. Return the new handler index. */ - -int duplicate_eh_handlers PARAMS ((int, int, rtx (*)(rtx))); - -/* map symbol refs for rethrow */ - -rtx rethrow_symbol_map PARAMS ((rtx, rtx (*)(rtx))); - -/* Is the rethrow label for a region used? */ - -int rethrow_used PARAMS ((int)); - -/* Update the rethrow references to reflect rethrows which have been - optimized away. */ +/* Start an exception handling region. All instructions emitted after + 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)); -void update_rethrow_references 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)); -/* Get a pointer to the first handler in an exception region's list. */ +/* 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)); -struct handler_info *get_first_handler PARAMS ((int)); +/* 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)); -/* Find all the runtime handlers type matches currently referenced */ +/* End a catch clause. Control will resume after the try/catch block. */ +extern void expand_end_catch PARAMS ((void)); -int find_all_handler_type_matches PARAMS ((void ***)); +/* End a sequence of catch handlers for a try block. */ +extern void expand_end_all_catch PARAMS ((void)); -/* 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. */ +/* 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)); -typedef struct eh_nesting -{ - int *region_index; - handler_info ***handlers; - int *num_handlers; - int *outer_index; - int region_count; -} eh_nesting_info; +/* 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)); -/* Initialize the eh_nesting_info structure. */ +/* 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)); -eh_nesting_info *init_eh_nesting_info PARAMS ((void)); +/* 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)); -/* Get a list of handlers reachable from a an exception region/insn. */ +/* 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))); -int reachable_handlers PARAMS ((int, eh_nesting_info *, rtx, - handler_info ***handlers)); +/* Determine if the given INSN can throw an exception. */ +extern bool can_throw_internal PARAMS ((rtx)); +extern bool can_throw_external PARAMS ((rtx)); -/* Free the eh_nesting_info structure. */ +/* Return nonzero if nothing in this function can throw. */ +extern bool nothrow_function_p PARAMS ((void)); -void free_eh_nesting_info PARAMS ((eh_nesting_info *)); +/* 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)); - -/* 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)); - -/* 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 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)); - -/* 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)); +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 -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. */ +/* 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. */ -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)); +#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 -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 +#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