| // Copyright (C) 2012 The Android Open Source Project |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions |
| // are met: |
| // 1. Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // 2. Redistributions in binary form must reproduce the above copyright |
| // notice, this list of conditions and the following disclaimer in the |
| // documentation and/or other materials provided with the distribution. |
| // 3. Neither the name of the project nor the names of its contributors |
| // may be used to endorse or promote products derived from this software |
| // without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
| // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| // ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
| // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| // OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| // HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| // OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| // SUCH DAMAGE. |
| //===----------------------------------------------------------------------===// |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| // |
| // This file implements the "Exception Handling APIs" |
| // http://www.codesourcery.com/public/cxx-abi/abi-eh.html |
| // http://www.intel.com/design/itanium/downloads/245358.htm |
| // |
| //===----------------------------------------------------------------------===// |
| /* |
| * Copyright 2010-2011 PathScale, Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS |
| * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| |
| #include <cstdlib> |
| #include <unwind.h> |
| |
| #include "cxxabi_defines.h" |
| #include "dwarf_helper.h" |
| #include "helper_func_internal.h" |
| |
| namespace __cxxabiv1 { |
| |
| #ifdef __arm__ |
| extern "C" enum type_match_result { |
| ctm_failed = 0, |
| ctm_succeeded = 1, |
| ctm_succeeded_with_ptr_to_base = 2 |
| }; |
| |
| |
| extern "C" type_match_result __attribute__((visibility("default"))) |
| __cxa_type_match(_Unwind_Exception* ucbp, |
| const __shim_type_info* rttip, |
| bool is_reference_type, |
| void** matched_object) { |
| |
| __cxa_exception* header = reinterpret_cast<__cxa_exception*>(ucbp+1)-1; |
| type_match_result result = ctm_succeeded; |
| |
| void* adjustedPtr = header+1; |
| if (dynamic_cast<const __pointer_type_info*>(header->exceptionType)) { |
| adjustedPtr = *reinterpret_cast<void**>(adjustedPtr); |
| result = ctm_succeeded_with_ptr_to_base; |
| } |
| |
| const __shim_type_info* catch_type = rttip; |
| const __shim_type_info* thrown_type = |
| static_cast<const __shim_type_info*>(header->exceptionType); |
| if (!catch_type || !thrown_type) { |
| return ctm_failed; |
| } |
| |
| if (catch_type->can_catch(thrown_type, adjustedPtr)) { |
| *matched_object = adjustedPtr; |
| return result; |
| } |
| |
| return ctm_failed; |
| } |
| #endif // __arm__ |
| |
| namespace { |
| |
| void terminate_helper(std::terminate_handler t_handler) { |
| try { |
| t_handler(); |
| abort(); |
| } catch (...) { |
| abort(); |
| } |
| } |
| |
| void unexpected_helper(std::unexpected_handler u_handler) { |
| u_handler(); |
| std::terminate(); |
| } |
| |
| } // namespace |
| |
| #ifdef __arm__ |
| extern "C" bool __attribute__((visibility("default"))) |
| __cxa_begin_cleanup(_Unwind_Exception* exc) { |
| __cxa_eh_globals *globals = __cxa_get_globals(); |
| __cxa_exception *header = reinterpret_cast<__cxa_exception*>(exc+1)-1; |
| bool native = header->unwindHeader.exception_class == __gxx_exception_class; |
| |
| if (native) { |
| header->cleanupCount += 1; |
| if (header->cleanupCount == 1) { // First time |
| header->nextCleanup = globals->cleanupExceptions; |
| globals->cleanupExceptions = header; |
| } |
| } else { |
| globals->cleanupExceptions = header; |
| } |
| |
| return true; |
| } |
| |
| extern "C" _Unwind_Exception * helper_end_cleanup() { |
| __cxa_eh_globals *globals = __cxa_get_globals(); |
| __cxa_exception* header = globals->cleanupExceptions; |
| |
| if (!header) { |
| std::terminate(); |
| } |
| |
| if (header->unwindHeader.exception_class == __gxx_exception_class) { |
| header->cleanupCount -= 1; |
| if (header->cleanupCount == 0) { // Last one |
| globals->cleanupExceptions = header->nextCleanup; |
| header->nextCleanup = NULL; |
| } |
| } else { |
| globals->cleanupExceptions = NULL; |
| } |
| |
| return &header->unwindHeader; |
| } |
| |
| asm ( |
| ".pushsection .text.__cxa_end_cleanup \n" |
| ".global __cxa_end_cleanup \n" |
| ".type __cxa_end_cleanup, \"function\" \n" |
| "__cxa_end_cleanup: \n" |
| " push\t{r1, r2, r3, r4} \n" |
| " bl helper_end_cleanup \n" |
| " pop\t{r1, r2, r3, r4} \n" |
| " bl _Unwind_Resume \n" |
| " bl abort \n" |
| ".popsection \n" |
| ); |
| |
| extern "C" void __attribute__((visibility("default"))) |
| __cxa_call_unexpected(void* arg) { |
| _Unwind_Exception* unwind_exception = static_cast<_Unwind_Exception*>(arg); |
| __cxa_exception* header = reinterpret_cast<__cxa_exception*>(unwind_exception+1)-1; |
| bool native_exception = unwind_exception->exception_class == __gxx_exception_class; |
| |
| if (!native_exception) { |
| __cxa_begin_catch(unwind_exception); // unexpected is also a handler |
| try { |
| std::unexpected(); |
| } catch (...) { |
| std::terminate(); |
| } |
| |
| return; |
| } |
| |
| // Cache previous data first since we will change contents below. |
| uint32_t count = unwind_exception->barrier_cache.bitpattern[1]; |
| uint32_t stride = unwind_exception->barrier_cache.bitpattern[3]; |
| uint32_t* list = reinterpret_cast<uint32_t*>( |
| unwind_exception->barrier_cache.bitpattern[4]); |
| |
| __cxa_begin_catch(unwind_exception); // unexpected is also a handler |
| try { |
| unexpected_helper(header->unexpectedHandler); |
| } catch (...) { |
| // A new exception thrown when calling unexpected. |
| bool allow_bad_exception = false; |
| |
| for (uint32_t i = 0; i != count; ++i) { |
| uint32_t offset = reinterpret_cast<uint32_t>(&list[i * (stride >> 2)]); |
| offset = decodeRelocTarget2(offset); |
| const __shim_type_info* catch_type = reinterpret_cast<const __shim_type_info*>(offset); |
| |
| __cxa_exception* new_header = __cxa_get_globals()->caughtExceptions; |
| void* adjustedPtr = new_header + 1; |
| if (__cxa_type_match(&new_header->unwindHeader, |
| catch_type, |
| false/* is_ref_type */, |
| &adjustedPtr) != ctm_failed) { |
| throw; |
| } |
| |
| void* null_adjustedPtr = NULL; |
| const __shim_type_info* bad_excp = |
| static_cast<const __shim_type_info*>(&typeid(std::bad_exception)); |
| if (catch_type->can_catch(bad_excp, null_adjustedPtr)) { |
| allow_bad_exception = true; |
| } |
| } |
| |
| // If no other ones match, throw bad_exception. |
| if (allow_bad_exception) { |
| __cxa_end_catch(); |
| __cxa_end_catch(); |
| throw std::bad_exception(); |
| } |
| |
| terminate_helper(header->terminateHandler); |
| } |
| } |
| #else // ! __arm__ |
| extern "C" void __attribute__((visibility("default"))) |
| __cxa_call_unexpected(void* arg) { |
| _Unwind_Exception* unwind_exception = static_cast<_Unwind_Exception*>(arg); |
| if (unwind_exception == 0) { |
| call_terminate(unwind_exception); |
| } |
| __cxa_begin_catch(unwind_exception); // unexpected is also a handler |
| |
| bool native_old_exception = unwind_exception->exception_class == __gxx_exception_class; |
| std::unexpected_handler u_handler; |
| std::terminate_handler t_handler; |
| __cxa_exception* old_exception_header = 0; |
| int64_t ttypeIndex; |
| const uint8_t* lsda; |
| if (native_old_exception) { |
| old_exception_header = reinterpret_cast<__cxa_exception*>(unwind_exception+1)-1; |
| t_handler = old_exception_header->terminateHandler; |
| u_handler = old_exception_header->unexpectedHandler; |
| // If unexpected_helper(u_handler) rethrows the same exception, |
| // these values get overwritten by the rethrow. So save them now: |
| ttypeIndex = old_exception_header->handlerSwitchValue; |
| lsda = old_exception_header->languageSpecificData; |
| } else { |
| t_handler = std::get_terminate(); |
| u_handler = std::get_unexpected(); |
| } |
| |
| try { |
| unexpected_helper(u_handler); |
| } catch (...) { |
| // A new exception thrown when calling unexpected. |
| |
| if (!native_old_exception) { |
| std::terminate(); |
| } |
| uint8_t lpStartEncoding = *lsda++; |
| readEncodedPointer(&lsda, lpStartEncoding); |
| uint8_t ttypeEncoding = *lsda++; |
| if (ttypeEncoding == DW_EH_PE_omit) { |
| terminate_helper(t_handler); |
| } |
| uintptr_t classInfoOffset = readULEB128(&lsda); |
| const uint8_t* classInfo = lsda + classInfoOffset; |
| __cxa_eh_globals* globals = __cxa_get_globals_fast(); |
| __cxa_exception* new_exception_header = globals->caughtExceptions; |
| if (new_exception_header == 0) { // This shouldn't be able to happen! |
| terminate_helper(t_handler); |
| } |
| bool native_new_exception = |
| new_exception_header->unwindHeader.exception_class == __gxx_exception_class; |
| |
| if (native_new_exception && (new_exception_header != old_exception_header)) { |
| const std::type_info* excpType = new_exception_header->exceptionType; |
| if (!canExceptionSpecCatch(ttypeIndex, classInfo, ttypeEncoding, |
| excpType, new_exception_header+1, unwind_exception)) { |
| // We need to __cxa_end_catch, but for the old exception, |
| // not the new one. This is a little tricky ... |
| // Disguise new_exception_header as a rethrown exception, but |
| // don't actually rethrow it. This means you can temporarily |
| // end the catch clause enclosing new_exception_header without |
| // __cxa_end_catch destroying new_exception_header. |
| new_exception_header->handlerCount = -new_exception_header->handlerCount; |
| globals->uncaughtExceptions += 1; |
| __cxa_end_catch(); |
| __cxa_end_catch(); |
| __cxa_begin_catch(&new_exception_header->unwindHeader); |
| throw; |
| } |
| } |
| |
| const std::type_info* excpType = &typeid(std::bad_exception); |
| if (!canExceptionSpecCatch(ttypeIndex, classInfo, ttypeEncoding, |
| excpType, NULL, unwind_exception)) { |
| __cxa_end_catch(); |
| __cxa_end_catch(); |
| throw std::bad_exception(); |
| } |
| } // catch (...) |
| |
| // Call terminate after unexpected normally done |
| terminate_helper(t_handler); |
| } |
| #endif // __arm__ |
| |
| } // namespace __cxxabiv1 |
