From: Marc Glisse <marc.glisse@inria.fr>
To: Richard Biener <richard.guenther@gmail.com>
Cc: "Martin Liška" <mliska@suse.cz>,
"Jason Merrill" <jason@redhat.com>,
"Jakub Jelinek" <jakub@redhat.com>,
"Jonathan Wakely" <jwakely.gcc@gmail.com>,
"Jan Hubicka" <hubicka@ucw.cz>,
"GCC Patches" <gcc-patches@gcc.gnu.org>,
"Nathan Sidwell" <nathan@acm.org>
Subject: Re: [PATCH] Allow new/delete operator deletion only for replaceable.
Date: Thu, 9 Apr 2020 10:04:47 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.22.394.2004090930080.7961@stedding.saclay.inria.fr> (raw)
In-Reply-To: <CAFiYyc1wO-_UxE8Ju4pHpK_M9-UC_ee2Sjv6kfJhQtX32Ecpxg@mail.gmail.com>
On Thu, 9 Apr 2020, Richard Biener wrote:
> On Thu, Apr 9, 2020 at 7:06 AM Martin Liška <mliska@suse.cz> wrote:
>>
>> Hi.
>>
>> We've got one another sneaky test-case (thank you Marc ;) ):
>>
>> $ cat pr94314-array.C
>> #include <stdio.h>
>> #include <new>
>>
>> int count = 0;
>>
>> __attribute__((malloc, noinline)) void* operator new[](unsigned long sz) {
>> ++count;
>> return ::operator new(sz);
>> }
>>
>> void operator delete[](void* ptr) noexcept {
>> --count;
>> ::operator delete(ptr);
>> }
>>
>> void operator delete[](void* ptr, std::size_t sz) noexcept {
>> --count;
>> ::operator delete(ptr, sz);
>> }
>>
>> int main() {
>> delete[] new int[1];
>> if (count != 0)
>> __builtin_abort ();
>> }
>>
>> I bet we need to include the Honza's fix for inline stacks.
>> Or it the test-case invalid?
>
> I don't see how inline stacking helps here when you consider
>
> void *foo(unsigned long sz) { return ::operator new(sz); }
> void operator delete[](void* ptr) noexcept {
> --count;
> ::operator delete(ptr);
> }
>
> thus regular functions inlining where definitely the inline
> stack depth does not need to match.
>
> I guess the testcase asks for us to match the exact
> operator form (in the testcase we match ::delete and ::new[]),
> for example by instead of looking at the decl flags
> simply match the assembler names (the mangled names)
> of the operator?
A hard-coded list can make sense (although if we use asm names, I guess we
have to take care of platforms that prefix all symbols with _ for
instance). Note that the matching is not 1-to-1. Array vs non-array and
aligned vs non-aligned seem important, but sized and unsized delete can
both match the same new, IIUC. Not sure about the nothrow versions...
--
Marc Glisse
next prev parent reply other threads:[~2020-04-09 8:05 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-30 8:40 [PATCH] Check DECL_CONTEXT of new/delete operators Martin Liška
2020-03-30 8:53 ` Richard Biener
2020-03-31 12:29 ` Jan Hubicka
2020-03-31 12:38 ` Martin Liška
2020-04-03 15:26 ` Jan Hubicka
2020-04-03 15:42 ` Jan Hubicka
2020-04-04 11:53 ` Jan Hubicka
2020-04-06 9:27 ` Richard Biener
2020-04-06 15:10 ` Jason Merrill
2020-04-06 8:34 ` Martin Liška
2020-04-06 12:45 ` Nathan Sidwell
2020-04-07 8:26 ` Jonathan Wakely
2020-04-07 9:29 ` Richard Biener
2020-04-07 9:49 ` Jan Hubicka
2020-04-07 10:22 ` Richard Biener
2020-04-07 10:42 ` Martin Liška
2020-04-07 11:41 ` Jonathan Wakely
2020-04-07 10:46 ` Martin Liška
2020-04-07 11:29 ` Jonathan Wakely
2020-04-07 11:40 ` Richard Biener
2020-04-07 11:46 ` Jonathan Wakely
2020-04-07 11:57 ` Richard Biener
2020-04-07 15:00 ` [PATCH] Allow new/delete operator deletion only for replaceable Martin Liška
2020-04-08 8:47 ` Richard Biener
2020-04-08 13:20 ` Jason Merrill
2020-04-08 13:32 ` Jakub Jelinek
2020-04-08 13:34 ` Jason Merrill
2020-04-08 15:16 ` Martin Liška
2020-04-08 15:46 ` Jan Hubicka
2020-04-08 16:06 ` Jakub Jelinek
2020-04-09 5:05 ` Martin Liška
2020-04-09 6:45 ` Richard Biener
2020-04-09 6:59 ` Martin Liška
2020-04-09 7:21 ` Richard Biener
2020-04-09 7:55 ` Jakub Jelinek
2020-04-09 8:04 ` Marc Glisse [this message]
2020-04-09 8:13 ` Jonathan Wakely
2020-04-10 8:08 ` Martin Liška
2020-04-10 8:18 ` Jonathan Wakely
2020-04-10 8:29 ` Martin Liška
2020-04-10 9:17 ` Jakub Jelinek
2020-04-14 7:09 ` Martin Liška
2020-04-14 7:11 ` Martin Liška
2020-04-14 8:37 ` Jakub Jelinek
2020-04-14 10:54 ` Martin Liška
2020-04-17 7:05 ` Jakub Jelinek
2020-04-17 8:12 ` Jonathan Wakely
2020-04-10 8:37 ` Marc Glisse
2020-04-10 9:11 ` Iain Sandoe
2020-04-09 16:55 ` Jason Merrill
2020-04-07 15:16 ` [PATCH] Check DECL_CONTEXT of new/delete operators Jonathan Wakely
2020-04-08 7:34 ` Richard Biener
2020-04-08 8:11 ` Jonathan Wakely
2020-04-07 14:11 ` Nathan Sidwell
2020-03-30 9:29 ` Marc Glisse
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