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/* Replace operator new/new[], for GDB, the GNU debugger.
Copyright (C) 2016-2024 Free Software Foundation, Inc.
This file is part of GDB.
This program 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 of the License, or
(at your option) any later version.
This program 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.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* GCC does not understand __has_feature. */
#if !defined(__has_feature)
# define __has_feature(x) 0
#endif
#if !__has_feature(address_sanitizer) && !defined(__SANITIZE_ADDRESS__)
#include "common-defs.h"
#include "host-defs.h"
#include <new>
/* These are declared in <new> starting C++14, but removing them
caused a build failure with clang. See PR build/31141. */
extern void operator delete (void *p, std::size_t) noexcept;
extern void operator delete[] (void *p, std::size_t) noexcept;
/* Override operator new / operator new[], in order to internal_error
on allocation failure and thus query the user for abort/core
dump/continue, just like xmalloc does. We don't do this from a
new-handler function instead (std::set_new_handler) because we want
to catch allocation errors from within global constructors too.
Skip overriding if building with -fsanitize=address though.
Address sanitizer wants to override operator new/delete too in
order to detect malloc+delete and new+free mismatches. Our
versions would mask out ASan's, with the result of losing that
useful mismatch detection.
Note that C++ implementations could either have their throw
versions call the nothrow versions (libstdc++), or the other way
around (clang/libc++). For that reason, we replace both throw and
nothrow variants and call malloc directly. */
void *
operator new (std::size_t sz)
{
/* malloc (0) is unpredictable; avoid it. */
if (sz == 0)
sz = 1;
void *p = malloc (sz); /* ARI: malloc */
if (p == NULL)
{
/* If the user decides to continue debugging, throw a
gdb_quit_bad_alloc exception instead of a regular QUIT
gdb_exception. The former extends both std::bad_alloc and a
QUIT gdb_exception. This is necessary because operator new
can only ever throw std::bad_alloc, or something that extends
it. */
try
{
malloc_failure (sz);
}
catch (gdb_exception &ex)
{
throw gdb_quit_bad_alloc (std::move (ex));
}
}
return p;
}
void *
operator new (std::size_t sz, const std::nothrow_t&) noexcept
{
/* malloc (0) is unpredictable; avoid it. */
if (sz == 0)
sz = 1;
return malloc (sz); /* ARI: malloc */
}
void *
operator new[] (std::size_t sz)
{
return ::operator new (sz);
}
void*
operator new[] (std::size_t sz, const std::nothrow_t&) noexcept
{
return ::operator new (sz, std::nothrow);
}
/* Define also operators delete as one can LD_PRELOAD=libasan.so.*
without recompiling the program with -fsanitize=address and then one would
get false positive alloc-dealloc-mismatch (malloc vs operator delete [])
errors from AddressSanitizers. */
void
operator delete (void *p) noexcept
{
free (p);
}
void
operator delete (void *p, const std::nothrow_t&) noexcept
{
return ::operator delete (p);
}
void
operator delete (void *p, std::size_t) noexcept
{
return ::operator delete (p, std::nothrow);
}
void
operator delete[] (void *p) noexcept
{
return ::operator delete (p);
}
void
operator delete[] (void *p, const std::nothrow_t&) noexcept
{
return ::operator delete (p, std::nothrow);
}
void
operator delete[] (void *p, std::size_t) noexcept
{
return ::operator delete[] (p, std::nothrow);
}
#endif
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