| /* Exception Handling interface routines. |
| Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001 |
| Free Software Foundation, Inc. |
| Contributed by Mike Stump <mrs@cygnus.com>. |
| |
| This file is part of GCC. |
| |
| 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. |
| |
| 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 GCC; see the file COPYING. If not, write to the Free |
| Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
| 02111-1307, USA. */ |
| |
| |
| #ifndef TREE_CODE |
| union tree_node; |
| #define tree union tree_node * |
| #endif |
| |
| #ifndef RTX_CODE |
| struct rtx_def; |
| #define rtx struct rtx_def * |
| #endif |
| |
| #ifndef GCC_VARRAY_H |
| struct varray_head_tag; |
| #define varray_type struct varray_head_tag * |
| #endif |
| |
| |
| /* 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 PARAMS ((int)); |
| |
| /* 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)); |
| |
| /* 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)); |
| |
| /* Begin a region that will contain entries created with |
| add_partial_entry. */ |
| extern void begin_protect_partials PARAMS ((void)); |
| |
| /* 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)); |
| |
| /* End all of the pending exception regions that have handlers added with |
| add_partial_entry. */ |
| extern void end_protect_partials PARAMS ((void)); |
| |
| |
| /* A list of labels used for exception handlers. */ |
| extern rtx exception_handler_labels; |
| |
| /* 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 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 *)); |
| |
| struct function; |
| struct inline_remap; |
| 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 TREE_CODE |
| #undef tree |
| #endif |
| |
| #ifndef RTX_CODE |
| #undef rtx |
| #endif |
| |
| #ifndef GCC_VARRAY_H |
| #undef varray_type |
| #endif |
| |
| |
| /* 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. */ |
| |
| #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 |
| |
| #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 |