1*c87b03e5Sespie /* Exception Handling interface routines. 2*c87b03e5Sespie Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002 3*c87b03e5Sespie Free Software Foundation, Inc. 4*c87b03e5Sespie Contributed by Mike Stump <mrs@cygnus.com>. 5*c87b03e5Sespie 6*c87b03e5Sespie This file is part of GCC. 7*c87b03e5Sespie 8*c87b03e5Sespie GCC is free software; you can redistribute it and/or modify it under 9*c87b03e5Sespie the terms of the GNU General Public License as published by the Free 10*c87b03e5Sespie Software Foundation; either version 2, or (at your option) any later 11*c87b03e5Sespie version. 12*c87b03e5Sespie 13*c87b03e5Sespie GCC is distributed in the hope that it will be useful, but WITHOUT ANY 14*c87b03e5Sespie WARRANTY; without even the implied warranty of MERCHANTABILITY or 15*c87b03e5Sespie FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 16*c87b03e5Sespie for more details. 17*c87b03e5Sespie 18*c87b03e5Sespie You should have received a copy of the GNU General Public License 19*c87b03e5Sespie along with GCC; see the file COPYING. If not, write to the Free 20*c87b03e5Sespie Software Foundation, 59 Temple Place - Suite 330, Boston, MA 21*c87b03e5Sespie 02111-1307, USA. */ 22*c87b03e5Sespie 23*c87b03e5Sespie 24*c87b03e5Sespie #ifndef GCC_VARRAY_H 25*c87b03e5Sespie struct varray_head_tag; 26*c87b03e5Sespie #define varray_type struct varray_head_tag * 27*c87b03e5Sespie #endif 28*c87b03e5Sespie 29*c87b03e5Sespie struct function; 30*c87b03e5Sespie 31*c87b03e5Sespie struct inline_remap; 32*c87b03e5Sespie 33*c87b03e5Sespie /* Per-function EH data. Used only in except.c, but GC and others 34*c87b03e5Sespie manipulate pointers to the opaque type. */ 35*c87b03e5Sespie struct eh_status; 36*c87b03e5Sespie 37*c87b03e5Sespie /* Internal structure describing a region. */ 38*c87b03e5Sespie struct eh_region; 39*c87b03e5Sespie 40*c87b03e5Sespie /* Test: is exception handling turned on? */ 41*c87b03e5Sespie extern int doing_eh PARAMS ((int)); 42*c87b03e5Sespie 43*c87b03e5Sespie /* Start an exception handling region. All instructions emitted after 44*c87b03e5Sespie this point are considered to be part of the region until an 45*c87b03e5Sespie expand_eh_region_end variant is invoked. */ 46*c87b03e5Sespie extern void expand_eh_region_start PARAMS ((void)); 47*c87b03e5Sespie 48*c87b03e5Sespie /* End an exception handling region for a cleanup. HANDLER is an 49*c87b03e5Sespie expression to expand for the cleanup. */ 50*c87b03e5Sespie extern void expand_eh_region_end_cleanup PARAMS ((tree)); 51*c87b03e5Sespie 52*c87b03e5Sespie /* End an exception handling region for a try block, and prepares 53*c87b03e5Sespie for subsequent calls to expand_start_catch. */ 54*c87b03e5Sespie extern void expand_start_all_catch PARAMS ((void)); 55*c87b03e5Sespie 56*c87b03e5Sespie /* Begin a catch clause. TYPE is an object to be matched by the 57*c87b03e5Sespie runtime, or a list of such objects, or null if this is a catch-all 58*c87b03e5Sespie clause. */ 59*c87b03e5Sespie extern void expand_start_catch PARAMS ((tree)); 60*c87b03e5Sespie 61*c87b03e5Sespie /* End a catch clause. Control will resume after the try/catch block. */ 62*c87b03e5Sespie extern void expand_end_catch PARAMS ((void)); 63*c87b03e5Sespie 64*c87b03e5Sespie /* End a sequence of catch handlers for a try block. */ 65*c87b03e5Sespie extern void expand_end_all_catch PARAMS ((void)); 66*c87b03e5Sespie 67*c87b03e5Sespie /* End an exception region for an exception type filter. ALLOWED is a 68*c87b03e5Sespie TREE_LIST of TREE_VALUE objects to be matched by the runtime. 69*c87b03e5Sespie FAILURE is a function to invoke if a mismatch occurs. */ 70*c87b03e5Sespie extern void expand_eh_region_end_allowed PARAMS ((tree, tree)); 71*c87b03e5Sespie 72*c87b03e5Sespie /* End an exception region for a must-not-throw filter. FAILURE is a 73*c87b03e5Sespie function to invoke if an uncaught exception propagates this far. */ 74*c87b03e5Sespie extern void expand_eh_region_end_must_not_throw PARAMS ((tree)); 75*c87b03e5Sespie 76*c87b03e5Sespie /* End an exception region for a throw. No handling goes on here, 77*c87b03e5Sespie but it's the easiest way for the front-end to indicate what type 78*c87b03e5Sespie is being thrown. */ 79*c87b03e5Sespie extern void expand_eh_region_end_throw PARAMS ((tree)); 80*c87b03e5Sespie 81*c87b03e5Sespie /* End a fixup region. Within this region the cleanups for the immediately 82*c87b03e5Sespie enclosing region are _not_ run. This is used for goto cleanup to avoid 83*c87b03e5Sespie destroying an object twice. */ 84*c87b03e5Sespie extern void expand_eh_region_end_fixup PARAMS ((tree)); 85*c87b03e5Sespie 86*c87b03e5Sespie /* Note that the current EH region (if any) may contain a throw, or a 87*c87b03e5Sespie call to a function which itself may contain a throw. */ 88*c87b03e5Sespie extern void note_eh_region_may_contain_throw PARAMS ((void)); 89*c87b03e5Sespie 90*c87b03e5Sespie /* Invokes CALLBACK for every exception handler label. Only used by old 91*c87b03e5Sespie loop hackery; should not be used by new code. */ 92*c87b03e5Sespie extern void for_each_eh_label PARAMS ((void (*) (rtx))); 93*c87b03e5Sespie 94*c87b03e5Sespie /* Determine if the given INSN can throw an exception. */ 95*c87b03e5Sespie extern bool can_throw_internal PARAMS ((rtx)); 96*c87b03e5Sespie extern bool can_throw_external PARAMS ((rtx)); 97*c87b03e5Sespie 98*c87b03e5Sespie /* Set current_function_nothrow and cfun->all_throwers_are_sibcalls. */ 99*c87b03e5Sespie extern void set_nothrow_function_flags PARAMS ((void)); 100*c87b03e5Sespie 101*c87b03e5Sespie /* After initial rtl generation, call back to finish generating 102*c87b03e5Sespie exception support code. */ 103*c87b03e5Sespie extern void finish_eh_generation PARAMS ((void)); 104*c87b03e5Sespie 105*c87b03e5Sespie extern void init_eh PARAMS ((void)); 106*c87b03e5Sespie extern void init_eh_for_function PARAMS ((void)); 107*c87b03e5Sespie 108*c87b03e5Sespie extern rtx reachable_handlers PARAMS ((rtx)); 109*c87b03e5Sespie extern void maybe_remove_eh_handler PARAMS ((rtx)); 110*c87b03e5Sespie 111*c87b03e5Sespie extern void convert_from_eh_region_ranges PARAMS ((void)); 112*c87b03e5Sespie extern void convert_to_eh_region_ranges PARAMS ((void)); 113*c87b03e5Sespie extern void find_exception_handler_labels PARAMS ((void)); 114*c87b03e5Sespie extern bool current_function_has_exception_handlers PARAMS ((void)); 115*c87b03e5Sespie extern void output_function_exception_table PARAMS ((void)); 116*c87b03e5Sespie 117*c87b03e5Sespie extern void expand_builtin_unwind_init PARAMS ((void)); 118*c87b03e5Sespie extern rtx expand_builtin_eh_return_data_regno PARAMS ((tree)); 119*c87b03e5Sespie extern rtx expand_builtin_extract_return_addr PARAMS ((tree)); 120*c87b03e5Sespie extern void expand_builtin_init_dwarf_reg_sizes PARAMS ((tree)); 121*c87b03e5Sespie extern rtx expand_builtin_frob_return_addr PARAMS ((tree)); 122*c87b03e5Sespie extern rtx expand_builtin_dwarf_sp_column PARAMS ((void)); 123*c87b03e5Sespie extern void expand_builtin_eh_return PARAMS ((tree, tree)); 124*c87b03e5Sespie extern void expand_eh_return PARAMS ((void)); 125*c87b03e5Sespie extern rtx get_exception_pointer PARAMS ((struct function *)); 126*c87b03e5Sespie extern int duplicate_eh_regions PARAMS ((struct function *, 127*c87b03e5Sespie struct inline_remap *)); 128*c87b03e5Sespie 129*c87b03e5Sespie extern void sjlj_emit_function_exit_after PARAMS ((rtx)); 130*c87b03e5Sespie 131*c87b03e5Sespie 132*c87b03e5Sespie /* If non-NULL, this is a function that returns an expression to be 133*c87b03e5Sespie executed if an unhandled exception is propagated out of a cleanup 134*c87b03e5Sespie region. For example, in C++, an exception thrown by a destructor 135*c87b03e5Sespie during stack unwinding is required to result in a call to 136*c87b03e5Sespie `std::terminate', so the C++ version of this function returns a 137*c87b03e5Sespie CALL_EXPR for `std::terminate'. */ 138*c87b03e5Sespie extern tree (*lang_protect_cleanup_actions) PARAMS ((void)); 139*c87b03e5Sespie 140*c87b03e5Sespie /* Return true if type A catches type B. */ 141*c87b03e5Sespie extern int (*lang_eh_type_covers) PARAMS ((tree a, tree b)); 142*c87b03e5Sespie 143*c87b03e5Sespie /* Map a type to a runtime object to match type. */ 144*c87b03e5Sespie extern tree (*lang_eh_runtime_type) PARAMS ((tree)); 145*c87b03e5Sespie 146*c87b03e5Sespie #ifndef GCC_VARRAY_H 147*c87b03e5Sespie #undef varray_type 148*c87b03e5Sespie #endif 149*c87b03e5Sespie 150*c87b03e5Sespie 151*c87b03e5Sespie /* Just because the user configured --with-sjlj-exceptions=no doesn't 152*c87b03e5Sespie mean that we can use call frame exceptions. Detect that the target 153*c87b03e5Sespie has appropriate support. */ 154*c87b03e5Sespie 155*c87b03e5Sespie #if ! (defined (EH_RETURN_DATA_REGNO) \ 156*c87b03e5Sespie && (defined (IA64_UNWIND_INFO) \ 157*c87b03e5Sespie || (DWARF2_UNWIND_INFO \ 158*c87b03e5Sespie && (defined (EH_RETURN_HANDLER_RTX) \ 159*c87b03e5Sespie || defined (HAVE_eh_return))))) 160*c87b03e5Sespie #define MUST_USE_SJLJ_EXCEPTIONS 1 161*c87b03e5Sespie #else 162*c87b03e5Sespie #define MUST_USE_SJLJ_EXCEPTIONS 0 163*c87b03e5Sespie #endif 164*c87b03e5Sespie 165*c87b03e5Sespie #ifdef CONFIG_SJLJ_EXCEPTIONS 166*c87b03e5Sespie # if CONFIG_SJLJ_EXCEPTIONS == 1 167*c87b03e5Sespie # define USING_SJLJ_EXCEPTIONS 1 168*c87b03e5Sespie # endif 169*c87b03e5Sespie # if CONFIG_SJLJ_EXCEPTIONS == 0 170*c87b03e5Sespie # define USING_SJLJ_EXCEPTIONS 0 171*c87b03e5Sespie # ifndef EH_RETURN_DATA_REGNO 172*c87b03e5Sespie #error "EH_RETURN_DATA_REGNO required" 173*c87b03e5Sespie # endif 174*c87b03e5Sespie # if !defined(EH_RETURN_HANDLER_RTX) && !defined(HAVE_eh_return) 175*c87b03e5Sespie #error "EH_RETURN_HANDLER_RTX or eh_return required" 176*c87b03e5Sespie # endif 177*c87b03e5Sespie # if !defined(DWARF2_UNWIND_INFO) && !defined(IA64_UNWIND_INFO) 178*c87b03e5Sespie #error "{DWARF2,IA64}_UNWIND_INFO required" 179*c87b03e5Sespie # endif 180*c87b03e5Sespie # endif 181*c87b03e5Sespie #else 182*c87b03e5Sespie # define USING_SJLJ_EXCEPTIONS MUST_USE_SJLJ_EXCEPTIONS 183*c87b03e5Sespie #endif 184