| 1 | /* Replace operator new/new[], for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 2016-2020 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | /* GCC does not understand __has_feature. */ |
| 21 | #if !defined(__has_feature) |
| 22 | # define __has_feature(x) 0 |
| 23 | #endif |
| 24 | |
| 25 | #if !__has_feature(address_sanitizer) && !defined(__SANITIZE_ADDRESS__) |
| 26 | #include "common-defs.h" |
| 27 | #include "host-defs.h" |
| 28 | #include <new> |
| 29 | |
| 30 | /* Override operator new / operator new[], in order to internal_error |
| 31 | on allocation failure and thus query the user for abort/core |
| 32 | dump/continue, just like xmalloc does. We don't do this from a |
| 33 | new-handler function instead (std::set_new_handler) because we want |
| 34 | to catch allocation errors from within global constructors too. |
| 35 | |
| 36 | Skip overriding if building with -fsanitize=address though. |
| 37 | Address sanitizer wants to override operator new/delete too in |
| 38 | order to detect malloc+delete and new+free mismatches. Our |
| 39 | versions would mask out ASan's, with the result of losing that |
| 40 | useful mismatch detection. |
| 41 | |
| 42 | Note that C++ implementations could either have their throw |
| 43 | versions call the nothrow versions (libstdc++), or the other way |
| 44 | around (clang/libc++). For that reason, we replace both throw and |
| 45 | nothrow variants and call malloc directly. */ |
| 46 | |
| 47 | void * |
| 48 | operator new (std::size_t sz) |
| 49 | { |
| 50 | /* malloc (0) is unpredictable; avoid it. */ |
| 51 | if (sz == 0) |
| 52 | sz = 1; |
| 53 | |
| 54 | void *p = malloc (sz); /* ARI: malloc */ |
| 55 | if (p == NULL) |
| 56 | { |
| 57 | /* If the user decides to continue debugging, throw a |
| 58 | gdb_quit_bad_alloc exception instead of a regular QUIT |
| 59 | gdb_exception. The former extends both std::bad_alloc and a |
| 60 | QUIT gdb_exception. This is necessary because operator new |
| 61 | can only ever throw std::bad_alloc, or something that extends |
| 62 | it. */ |
| 63 | try |
| 64 | { |
| 65 | malloc_failure (sz); |
| 66 | } |
| 67 | catch (gdb_exception &ex) |
| 68 | { |
| 69 | throw gdb_quit_bad_alloc (std::move (ex)); |
| 70 | } |
| 71 | } |
| 72 | return p; |
| 73 | } |
| 74 | |
| 75 | void * |
| 76 | operator new (std::size_t sz, const std::nothrow_t&) noexcept |
| 77 | { |
| 78 | /* malloc (0) is unpredictable; avoid it. */ |
| 79 | if (sz == 0) |
| 80 | sz = 1; |
| 81 | return malloc (sz); /* ARI: malloc */ |
| 82 | } |
| 83 | |
| 84 | void * |
| 85 | operator new[] (std::size_t sz) |
| 86 | { |
| 87 | return ::operator new (sz); |
| 88 | } |
| 89 | |
| 90 | void* |
| 91 | operator new[] (std::size_t sz, const std::nothrow_t&) noexcept |
| 92 | { |
| 93 | return ::operator new (sz, std::nothrow); |
| 94 | } |
| 95 | #endif |