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[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc4/] [libstdc++-v3/] [libsupc++/] [eh_arm.cc] - Rev 594
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// -*- C++ -*- ARM specific Exception handling support routines. // Copyright (C) 2004, 2005, 2008, 2009 Free Software Foundation, Inc. // // 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 3, 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. // // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. #include <cxxabi.h> #include "unwind-cxx.h" #ifdef __ARM_EABI_UNWINDER__ using namespace __cxxabiv1; // Given the thrown type THROW_TYPE, pointer to a variable containing a // pointer to the exception object THROWN_PTR_P and a type CATCH_TYPE to // compare against, return whether or not there is a match and if so, // update *THROWN_PTR_P. extern "C" __cxa_type_match_result __cxa_type_match(_Unwind_Exception* ue_header, const std::type_info* catch_type, bool is_reference __attribute__((__unused__)), void** thrown_ptr_p) { bool forced_unwind = __is_gxx_forced_unwind_class(ue_header->exception_class); bool foreign_exception = !forced_unwind && !__is_gxx_exception_class(ue_header->exception_class); bool dependent_exception = __is_dependent_exception(ue_header->exception_class); __cxa_exception* xh = __get_exception_header_from_ue(ue_header); __cxa_dependent_exception *dx = __get_dependent_exception_from_ue(ue_header); const std::type_info* throw_type; if (forced_unwind) throw_type = &typeid(abi::__forced_unwind); else if (foreign_exception) throw_type = &typeid(abi::__foreign_exception); else if (dependent_exception) throw_type = __get_exception_header_from_obj (dx->primaryException)->exceptionType; else throw_type = xh->exceptionType; void* thrown_ptr = *thrown_ptr_p; // Pointer types need to adjust the actual pointer, not // the pointer to pointer that is the exception object. // This also has the effect of passing pointer types // "by value" through the __cxa_begin_catch return value. if (throw_type->__is_pointer_p()) thrown_ptr = *(void**) thrown_ptr; if (catch_type->__do_catch(throw_type, &thrown_ptr, 1)) { *thrown_ptr_p = thrown_ptr; if (typeid(*catch_type) == typeid (typeid(void*))) { const __pointer_type_info *catch_pointer_type = static_cast<const __pointer_type_info *> (catch_type); const __pointer_type_info *throw_pointer_type = static_cast<const __pointer_type_info *> (throw_type); if (typeid (*catch_pointer_type->__pointee) != typeid (void) && (*catch_pointer_type->__pointee != *throw_pointer_type->__pointee)) return ctm_succeeded_with_ptr_to_base; } return ctm_succeeded; } return ctm_failed; } // ABI defined routine called at the start of a cleanup handler. extern "C" bool __cxa_begin_cleanup(_Unwind_Exception* ue_header) { __cxa_eh_globals *globals = __cxa_get_globals(); __cxa_exception *header = __get_exception_header_from_ue(ue_header); bool native = __is_gxx_exception_class(header->unwindHeader.exception_class); if (native) { header->propagationCount++; // Add it to the chain if this is the first time we've seen this // exception. if (header->propagationCount == 1) { header->nextPropagatingException = globals->propagatingExceptions; globals->propagatingExceptions = header; } } else { // Remember the exception object, so end_cleanup can return it. // These cannot be stacked, so we must abort if we already have // a propagating exception. if (globals->propagatingExceptions) std::terminate (); globals->propagatingExceptions = header; } return true; } // Do the work for __cxa_end_cleanup. Returns the currently propagating // exception object. extern "C" _Unwind_Exception * __gnu_end_cleanup(void) { __cxa_exception *header; __cxa_eh_globals *globals = __cxa_get_globals(); header = globals->propagatingExceptions; // Check something hasn't gone horribly wrong. if (!header) std::terminate(); if (__is_gxx_exception_class(header->unwindHeader.exception_class)) { header->propagationCount--; if (header->propagationCount == 0) { // Remove exception from chain. globals->propagatingExceptions = header->nextPropagatingException; header->nextPropagatingException = NULL; } } else globals->propagatingExceptions = NULL; return &header->unwindHeader; } // Assembly wrapper to call __gnu_end_cleanup without clobbering r1-r3. // Also push r4 to preserve stack alignment. #ifdef __thumb__ asm (".global __cxa_end_cleanup\n" " .type __cxa_end_cleanup, \"function\"\n" " .thumb_func\n" "__cxa_end_cleanup:\n" " push\t{r1, r2, r3, r4}\n" " bl\t__gnu_end_cleanup\n" " pop\t{r1, r2, r3, r4}\n" " bl\t_Unwind_Resume @ Never returns\n"); #else asm (".global __cxa_end_cleanup\n" " .type __cxa_end_cleanup, \"function\"\n" "__cxa_end_cleanup:\n" " stmfd\tsp!, {r1, r2, r3, r4}\n" " bl\t__gnu_end_cleanup\n" " ldmfd\tsp!, {r1, r2, r3, r4}\n" " bl\t_Unwind_Resume @ Never returns\n"); #endif #endif
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