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503b1c39 PA |
1 | /* Replace operator new/new[], for GDB, the GNU debugger. |
2 | ||
1d506c26 | 3 | Copyright (C) 2016-2024 Free Software Foundation, Inc. |
503b1c39 PA |
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 | ||
3ef9d661 YQ |
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__) | |
503b1c39 PA |
26 | #include "common-defs.h" |
27 | #include "host-defs.h" | |
28 | #include <new> | |
29 | ||
9b9e5c09 TT |
30 | /* These are declared in <new> starting C++14, but removing them |
31 | caused a build failure with clang. See PR build/31141. */ | |
32 | extern void operator delete (void *p, std::size_t) noexcept; | |
33 | extern void operator delete[] (void *p, std::size_t) noexcept; | |
34 | ||
503b1c39 PA |
35 | /* Override operator new / operator new[], in order to internal_error |
36 | on allocation failure and thus query the user for abort/core | |
37 | dump/continue, just like xmalloc does. We don't do this from a | |
38 | new-handler function instead (std::set_new_handler) because we want | |
39 | to catch allocation errors from within global constructors too. | |
40 | ||
e4426cb4 PA |
41 | Skip overriding if building with -fsanitize=address though. |
42 | Address sanitizer wants to override operator new/delete too in | |
43 | order to detect malloc+delete and new+free mismatches. Our | |
44 | versions would mask out ASan's, with the result of losing that | |
45 | useful mismatch detection. | |
46 | ||
503b1c39 PA |
47 | Note that C++ implementations could either have their throw |
48 | versions call the nothrow versions (libstdc++), or the other way | |
49 | around (clang/libc++). For that reason, we replace both throw and | |
50 | nothrow variants and call malloc directly. */ | |
51 | ||
52 | void * | |
53 | operator new (std::size_t sz) | |
54 | { | |
55 | /* malloc (0) is unpredictable; avoid it. */ | |
56 | if (sz == 0) | |
57 | sz = 1; | |
58 | ||
59 | void *p = malloc (sz); /* ARI: malloc */ | |
60 | if (p == NULL) | |
61 | { | |
62 | /* If the user decides to continue debugging, throw a | |
63 | gdb_quit_bad_alloc exception instead of a regular QUIT | |
64 | gdb_exception. The former extends both std::bad_alloc and a | |
65 | QUIT gdb_exception. This is necessary because operator new | |
66 | can only ever throw std::bad_alloc, or something that extends | |
67 | it. */ | |
a70b8144 | 68 | try |
503b1c39 PA |
69 | { |
70 | malloc_failure (sz); | |
71 | } | |
94aeb44b | 72 | catch (gdb_exception &ex) |
503b1c39 | 73 | { |
94aeb44b | 74 | throw gdb_quit_bad_alloc (std::move (ex)); |
503b1c39 | 75 | } |
503b1c39 PA |
76 | } |
77 | return p; | |
78 | } | |
79 | ||
80 | void * | |
bbe910e6 | 81 | operator new (std::size_t sz, const std::nothrow_t&) noexcept |
503b1c39 PA |
82 | { |
83 | /* malloc (0) is unpredictable; avoid it. */ | |
84 | if (sz == 0) | |
85 | sz = 1; | |
86 | return malloc (sz); /* ARI: malloc */ | |
87 | } | |
88 | ||
89 | void * | |
90 | operator new[] (std::size_t sz) | |
91 | { | |
92 | return ::operator new (sz); | |
93 | } | |
94 | ||
95 | void* | |
bbe910e6 | 96 | operator new[] (std::size_t sz, const std::nothrow_t&) noexcept |
503b1c39 PA |
97 | { |
98 | return ::operator new (sz, std::nothrow); | |
99 | } | |
5fff6115 JK |
100 | |
101 | /* Define also operators delete as one can LD_PRELOAD=libasan.so.* | |
102 | without recompiling the program with -fsanitize=address and then one would | |
103 | get false positive alloc-dealloc-mismatch (malloc vs operator delete []) | |
104 | errors from AddressSanitizers. */ | |
105 | ||
106 | void | |
fdf95218 | 107 | operator delete (void *p) noexcept |
5fff6115 JK |
108 | { |
109 | free (p); | |
110 | } | |
111 | ||
112 | void | |
113 | operator delete (void *p, const std::nothrow_t&) noexcept | |
114 | { | |
115 | return ::operator delete (p); | |
116 | } | |
117 | ||
118 | void | |
119 | operator delete (void *p, std::size_t) noexcept | |
120 | { | |
121 | return ::operator delete (p, std::nothrow); | |
122 | } | |
123 | ||
124 | void | |
fdf95218 | 125 | operator delete[] (void *p) noexcept |
5fff6115 JK |
126 | { |
127 | return ::operator delete (p); | |
128 | } | |
129 | ||
130 | void | |
131 | operator delete[] (void *p, const std::nothrow_t&) noexcept | |
132 | { | |
133 | return ::operator delete (p, std::nothrow); | |
134 | } | |
135 | ||
136 | void | |
137 | operator delete[] (void *p, std::size_t) noexcept | |
138 | { | |
139 | return ::operator delete[] (p, std::nothrow); | |
140 | } | |
141 | ||
3ef9d661 | 142 | #endif |