* [Bug c++/46188] -fipa-cp removes destructor call
2010-10-26 17:05 [Bug c++/46188] New: -fipa-cp removes destructor call jens.maurer at gmx dot net
@ 2010-10-26 19:08 ` pinskia at gcc dot gnu.org
2010-10-26 21:09 ` jens.maurer at gmx dot net
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From: pinskia at gcc dot gnu.org @ 2010-10-26 19:08 UTC (permalink / raw)
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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2010-10-26 19:08:37 UTC ---
I think this has some undefined code in it.
The dynamic type of this->data changes a few times and I don't know the current
type when delete[] is called.
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2010-10-26 19:08 ` [Bug c++/46188] " pinskia at gcc dot gnu.org
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From: jens.maurer at gmx dot net @ 2010-10-26 21:09 UTC (permalink / raw)
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Jens Maurer <jens.maurer at gmx dot net> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #22164|0 |1
is obsolete| |
--- Comment #2 from Jens Maurer <jens.maurer at gmx dot net> 2010-10-26 21:09:14 UTC ---
Created attachment 22165
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22165
file to reproduce the bug, now with all aliasing and memory allocation removed
Thanks for your comment. I've uploaded a new test file that removes all memory
allocations and never ever stores something in this->data, so no aliasing
issues should arise.
Instead of "delete[]", I'm now calling an external function "h". As usual,
I've removed the .cfi notes from the assembly quotes below.
bad compile:
$ g++ -S playground2.cxx -fverbose-asm -O2
125 call g(C const&, C&) #
126 .LEHE0:
127 movq 24(%rsp), %rdi # c2.b_array.data, D.3401
128 testq %rdi, %rdi # D.3401
129 je .L9 #,
130 .LEHB1:
131 call h(char*) #
132 .LEHE1:
133 .L9:
134 movq 16(%rsp), %rdi # c2.s.adr,
135 .LEHB2:
136 call h(char*) #
137 .LEHE2:
138 addq $48, %rsp #,
141 popq %rbx #
143 ret
good compile:
$ g++ -S playground2.cxx -fverbose-asm -O2 -fno-ipa-cp
130 call g(C const&, C&) #
131 .LEHE0:
132 movq 8(%rsp), %rbx # c2.b_array.data, p
133 testq %rbx, %rbx # p
134 je .L9 #,
135 movq 16(%rsp), %r12 # c2.b_array.size, D.3387
136 testq %r12, %r12 # D.3387
137 je .L10 #,
138 xorl %ebp, %ebp # i
139 jmp .L14 #
140 .p2align 4,,10
141 .p2align 3
142 .L22:
143 addq $24, %rbx #, p
144 .L14:
145 movq (%rbx), %rdi # p->char_array.data, D.3401
146 testq %rdi, %rdi # D.3401
147 je .L12 #,
148 .LEHB1:
149 call h(char*) #
150 .L12:
151 addq $1, %rbp #, i
152 cmpq %rbp, %r12 # i, D.3387
153 ja .L22 #,
154 movq 8(%rsp), %rbx # c2.b_array.data, p
155 .L10:
156 movq %rbx, %rdi # p,
157 call h(char*) #
158 .LEHE1:
159 .L9:
160 movq (%rsp), %rdi # c2.s.adr,
161 .LEHB2:
162 call h(char*) #
163 .LEHE2:
164 addq $32, %rsp #,
167 popq %rbx #
169 popq %rbp #
171 popq %r12 #
173 ret
As can be seen, the destructors on B::char_array are being called (as evidenced
by the loop calling "h"), as opposed to the bad compile, where this does not
happen. The compile turns good under the same modifications as before.
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2010-10-26 17:05 [Bug c++/46188] New: -fipa-cp removes destructor call jens.maurer at gmx dot net
2010-10-26 19:08 ` [Bug c++/46188] " pinskia at gcc dot gnu.org
2010-10-26 21:09 ` jens.maurer at gmx dot net
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--- Comment #3 from Jens Maurer <jens.maurer at gmx dot net> 2010-10-27 06:14:31 UTC ---
Created attachment 22170
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22170
improved testcase
The previous testcase had the problem that the compiler could legitimately
assume that Array::operator= actually left the Array empty, and thus omission
of the destructor calls for the nested Array was actually fine.
I've now added a call to an external function "do_something" at the end of
Array::operator= (which could change the state of the Array as it pleases);
this ought to kill any ideas the compiler might retain about the state of the
Array.
The issue remains reproducible; assembler code essentially unchanged from
above. Please excuse the confusion.
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--- Comment #4 from Jens Maurer <jens.maurer at gmx dot net> 2010-10-27 07:55:37 UTC ---
Created attachment 22171
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22171
two "if" conditions removed from the testcase
Two "if" conditions increase the complexity of the assembler code. Removing
them doesn't change anything in reproducibility. So I removed them.
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From: zsojka at seznam dot cz @ 2010-10-27 10:31 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #5 from Zdenek Sojka <zsojka at seznam dot cz> 2010-10-27 10:30:35 UTC ---
Created attachment 22172
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22172
the second part of testcase
I used this file to complete your testcase. It defines remaining functions and
prints some debug output. (x86_86-pc-linux-gnu target)
gcc-4.5.2 (r165781)
$ g++ -O2 playground4.cxx playground_main.cxx && ./a.out
pre-f()
Array<B>::do_something()
h(0x602030)
h((nil))
post-f()
h((nil))
h(0x602010)
h((nil))
$ g++ -O2 -fno-ipa-cp playground4.cxx playground_main.cxx && ./a.out
pre-f()
Array<B>::do_something()
h((nil))
h(0x602030)
h((nil))
post-f()
h((nil))
h(0x602010)
h((nil))
gcc 4.6.0 (r165985)
$ g++ -O2 playground4.cxx playground_main.cxx && ./a.out
pre-f()
Array<B>::do_something()
h((nil))
h(0x602030)
h((nil))
post-f()
h((nil))
h(0x602010)
h((nil))
For 4.5 -fipa-cp the output is different. I don't see anything obviously wrong
with the testcase, and valgrind doesn't anyreport any errors. But I am
certainly not an expert.
Apart from this:
#pragma interface
#pragma interface "subdir/objects.h"
Use this directive in header files that define object classes, to save
space in most of the object files that use those classes.
It's not a header file and #pragma implementation is nowhere... I suppose the
testcase was reduced from preprocessed files.
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--- Comment #6 from Jens Maurer <jens.maurer at gmx dot net> 2010-10-27 13:15:19 UTC ---
Thanks. Yes, the testcase was reduced from preprocessed files. Unfortunately,
you can't remove the "#pragma interface" without breaking the testcase. But
the only documented effect that "#pragma interface" should have is that I get
linker errors, i.e. undefined symbols.
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--- Comment #6 from Jens Maurer <jens.maurer at gmx dot net> 2010-10-27 13:15:19 UTC ---
Thanks. Yes, the testcase was reduced from preprocessed files. Unfortunately,
you can't remove the "#pragma interface" without breaking the testcase. But
the only documented effect that "#pragma interface" should have is that I get
linker errors, i.e. undefined symbols.
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To: gcc-bugs
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--- Comment #7 from Zdenek Sojka <zsojka at seznam dot cz> 2010-10-27 15:44:20 UTC ---
Created attachment 22179
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22179
reduced testcase, packed
One header file and two C++ files.
This doesn't use any operator overloading, so should be easier to understand.
Tested revisions:
r165915 - OK
r161659 - OK
r159696 - fail
r158095 - fail
4.5 r165781 - fail
4.5.1 - fail
4.4 r165754 - OK
Good output:
$ g++-4.5.1 pr46188_foo.C pr46188_main.C -O2 -fno-ipa-cp && ./a.out
pre-f()
void Array::foo()
void h(T*) [with T = char] ((nil))
void h(T*) [with T = char] ((nil))
void h(T*) [with T = String] (0x603010)
post-f()
Bad output:
$ g++-4.5.1 pr46188_foo.C pr46188_main.C -O2 && ./a.out
pre-f()
void Array::foo()
void h(T*) [with T = char] ((nil))
void h(T*) [with T = String] (0x603010)
post-f()
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From: jason at gcc dot gnu.org @ 2010-11-10 19:11 UTC (permalink / raw)
To: gcc-bugs
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Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2010.11.10 19:11:20
CC| |jason at gcc dot gnu.org
Known to work| |4.4.5, 4.6.0
Summary|-fipa-cp removes destructor |[4.5 regression] -fipa-cp
|call |removes destructor call
Ever Confirmed|0 |1
Known to fail| |4.5.1
--- Comment #8 from Jason Merrill <jason at gcc dot gnu.org> 2010-11-10 19:11:20 UTC ---
Confirmed. Even though size is 1 in ~Array, the inlined form of destruct
assumes that end is 0. This is first visible in the IPA inline pass.
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From: rguenth at gcc dot gnu.org @ 2010-11-10 23:01 UTC (permalink / raw)
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Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jamborm at gcc dot gnu.org
Target Milestone|--- |4.5.2
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Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
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From: rguenth at gcc dot gnu.org @ 2010-12-16 13:06 UTC (permalink / raw)
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Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.5.2 |4.5.3
--- Comment #9 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-12-16 13:03:04 UTC ---
GCC 4.5.2 is being released, adjusting target milestone.
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From: mikpe at it dot uu.se @ 2011-02-05 15:19 UTC (permalink / raw)
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Mikael Pettersson <mikpe at it dot uu.se> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hubicka at gcc dot gnu.org,
| |mikpe at it dot uu.se
--- Comment #10 from Mikael Pettersson <mikpe at it dot uu.se> 2011-02-05 15:19:22 UTC ---
This was fixed for 4.6 by r159907:
Author: hubicka
Date: Thu May 27 02:07:01 2010
New Revision: 159907
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=159907
Log:
* cgraphunit.c (verify_cgraph_node): Do checking that DECL match
edge only when checking is enabled; check using former_clone_of;
check inline clones too.
(cgraph_materialize_clone): Record former_clone_of pointer.
(cgraph_redirect_edge_call_stmt_to_callee): Assert that we are not
combining redirections; dump args_to_skip bitmap
(cgraph_materialize_all_clones): Do no redirection here.
* ipa-inline.c (inline_transform): Do redirection here.
* cgraph.h (struct cgraph_node): Add former_clone_of filed (enabled
cheking only).
See also:
http://gcc.gnu.org/ml/gcc-patches/2010-05/msg02029.html
The patch doesn't apply as-is to 4.5.2 so I haven't checked if it solves the
bug there too.
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Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Depends on| |44295
--- Comment #11 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-04-18 14:49:48 UTC ---
Depends on fix for PR44295.
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From: rguenth at gcc dot gnu.org @ 2011-04-18 15:33 UTC (permalink / raw)
To: gcc-bugs
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Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
AssignedTo|unassigned at gcc dot |rguenth at gcc dot gnu.org
|gnu.org |
--- Comment #12 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-04-18 15:31:48 UTC ---
Created attachment 24034
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24034
backport
Testing the attached backport.
I didn't manage to produce a testcase that doesn't use printf.
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To: gcc-bugs
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--- Comment #13 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-04-19 08:59:47 UTC ---
Author: rguenth
Date: Tue Apr 19 08:59:45 2011
New Revision: 172698
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=172698
Log:
2011-04-19 Richard Guenther <rguenther@suse.de>
PR tree-optimization/46188
Backported from 4.6 branch
2010-05-26 Jan Hubicka <jh@suse.cz>
* cgraphunit.c (clone_of_p): Remove.
(verify_cgraph_node): Do not verify clones.
(cgraph_materialize_all_clones): Do no redirection here.
* ipa-inline.c (inline_transform): Do redirection here.
Modified:
branches/gcc-4_5-branch/gcc/ChangeLog
branches/gcc-4_5-branch/gcc/cgraphunit.c
branches/gcc-4_5-branch/gcc/ipa-inline.c
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From: rguenth at gcc dot gnu.org @ 2011-04-19 9:03 UTC (permalink / raw)
To: gcc-bugs
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Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
--- Comment #14 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-04-19 09:00:09 UTC ---
Fixed.
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