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From: "vincenzo.innocente at cern dot ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/53186] New: [C++11] missing devirtualization for operators "final"
Date: Wed, 02 May 2012 07:59:00 -0000 [thread overview]
Message-ID: <bug-53186-4@http.gcc.gnu.org/bugzilla/> (raw)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53186
Bug #: 53186
Summary: [C++11] missing devirtualization for operators "final"
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: vincenzo.innocente@cern.ch
the example below shows how the keyword "final" has NO effect in devirtualizing
operators while it works for methods (as solved in PR49488)
cat opFinal.cpp
struct A {
virtual void operator()();
virtual void m();
};
struct F1 {
virtual void operator()() final;
virtual void m() final;
};
struct F2 final {
virtual void operator()();
virtual void m();
};
void fooAop(A & a) {a();}
void fooA(A & a) {a.m();}
void fooF1op(F1 & a) {a();}
void fooF1(F1 & a) {a.m();}
void fooF2op(F2 & a) {a();}
void fooF2(F2 & a) {a.m();}
c++ -std=gnu++11 -c opFinal.cpp; nm opFinal.o; otool -t -v -V -X opFinal.o |
c++filt
00000000000000c0 s EH_frame1
0000000000000021 T __Z4fooAR1A
0000000000000067 T __Z5fooF1R2F1
00000000000000a2 T __Z5fooF2R2F2
0000000000000000 T __Z6fooAopR1A
0000000000000046 T __Z7fooF1opR2F1
0000000000000081 T __Z7fooF2opR2F2
U __ZN2F11mEv
U __ZN2F21mEv
fooAop(A&):
pushq %rbp
movq %rsp,%rbp
subq $0x10,%rsp
movq %rdi,0xf8(%rbp)
movq 0xf8(%rbp),%rax
movq (%rax),%rax
movq (%rax),%rax
movq 0xf8(%rbp),%rdx
movq %rdx,%rdi
call *%rax
leave
ret
fooA(A&):
pushq %rbp
movq %rsp,%rbp
subq $0x10,%rsp
movq %rdi,0xf8(%rbp)
movq 0xf8(%rbp),%rax
movq (%rax),%rax
addq $0x08,%rax
movq (%rax),%rax
movq 0xf8(%rbp),%rdx
movq %rdx,%rdi
call *%rax
leave
ret
fooF1op(F1&):
pushq %rbp
movq %rsp,%rbp
subq $0x10,%rsp
movq %rdi,0xf8(%rbp)
movq 0xf8(%rbp),%rax
movq (%rax),%rax
movq (%rax),%rax
movq 0xf8(%rbp),%rdx
movq %rdx,%rdi
call *%rax
leave
ret
fooF1(F1&):
pushq %rbp
movq %rsp,%rbp
subq $0x10,%rsp
movq %rdi,0xf8(%rbp)
movq 0xf8(%rbp),%rax
movq %rax,%rdi
callq F1::m()
leave
ret
fooF2op(F2&):
pushq %rbp
movq %rsp,%rbp
subq $0x10,%rsp
movq %rdi,0xf8(%rbp)
movq 0xf8(%rbp),%rax
movq (%rax),%rax
movq (%rax),%rax
movq 0xf8(%rbp),%rdx
movq %rdx,%rdi
call *%rax
leave
ret
fooF2(F2&):
pushq %rbp
movq %rsp,%rbp
subq $0x10,%rsp
movq %rdi,0xf8(%rbp)
movq 0xf8(%rbp),%rax
movq %rax,%rdi
callq F2::m()
leave
ret
host-001:bugs48 innocent$ cat opFinal.cpp
struct A {
virtual void operator()();
virtual void m();
};
struct F1 {
virtual void operator()() final;
virtual void m() final;
};
struct F2 final {
virtual void operator()();
virtual void m();
};
void fooAop(A & a) {a();}
void fooA(A & a) {a.m();}
void fooF1op(F1 & a) {a();}
void fooF1(F1 & a) {a.m();}
void fooF2op(F2 & a) {a();}
void fooF2(F2 & a) {a.m();}
host-001:bugs48 innocent$ c++ -std=gnu++11 -c opFinal.cpp; nm opFinal.o; otool
-t -v -V -X opFinal.o | c++filt
00000000000000c0 s EH_frame1
0000000000000021 T __Z4fooAR1A
0000000000000067 T __Z5fooF1R2F1
00000000000000a2 T __Z5fooF2R2F2
0000000000000000 T __Z6fooAopR1A
0000000000000046 T __Z7fooF1opR2F1
0000000000000081 T __Z7fooF2opR2F2
U __ZN2F11mEv
U __ZN2F21mEv
fooAop(A&):
pushq %rbp
movq %rsp,%rbp
subq $0x10,%rsp
movq %rdi,0xf8(%rbp)
movq 0xf8(%rbp),%rax
movq (%rax),%rax
movq (%rax),%rax
movq 0xf8(%rbp),%rdx
movq %rdx,%rdi
call *%rax
leave
ret
fooA(A&):
pushq %rbp
movq %rsp,%rbp
subq $0x10,%rsp
movq %rdi,0xf8(%rbp)
movq 0xf8(%rbp),%rax
movq (%rax),%rax
addq $0x08,%rax
movq (%rax),%rax
movq 0xf8(%rbp),%rdx
movq %rdx,%rdi
call *%rax
leave
ret
fooF1op(F1&):
pushq %rbp
movq %rsp,%rbp
subq $0x10,%rsp
movq %rdi,0xf8(%rbp)
movq 0xf8(%rbp),%rax
movq (%rax),%rax
movq (%rax),%rax
movq 0xf8(%rbp),%rdx
movq %rdx,%rdi
call *%rax
leave
ret
fooF1(F1&):
pushq %rbp
movq %rsp,%rbp
subq $0x10,%rsp
movq %rdi,0xf8(%rbp)
movq 0xf8(%rbp),%rax
movq %rax,%rdi
callq F1::m()
leave
ret
fooF2op(F2&):
pushq %rbp
movq %rsp,%rbp
subq $0x10,%rsp
movq %rdi,0xf8(%rbp)
movq 0xf8(%rbp),%rax
movq (%rax),%rax
movq (%rax),%rax
movq 0xf8(%rbp),%rdx
movq %rdx,%rdi
call *%rax
leave
ret
fooF2(F2&):
pushq %rbp
movq %rsp,%rbp
subq $0x10,%rsp
movq %rdi,0xf8(%rbp)
movq 0xf8(%rbp),%rax
movq %rax,%rdi
callq F2::m()
leave
ret
host-001:bugs48 innocent$ c++ -v
Using built-in specs.
COLLECT_GCC=c++
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-apple-darwin11.3.0/4.8.0/lto-wrapper
Target: x86_64-apple-darwin11.3.0
Configured with: ./configure --enable-languages=c,c++,fortran
--disable-multilib --disable-bootstrap --enable-lto -disable-libitm :
(reconfigured) ./configure --enable-languages=c,c++,fortran --disable-multilib
--disable-bootstrap --enable-lto -disable-libitm
Thread model: posix
gcc version 4.8.0 20120416 (experimental) [trunk revision 186494] (GCC)
next reply other threads:[~2012-05-02 7:59 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-02 7:59 vincenzo.innocente at cern dot ch [this message]
2012-05-03 0:51 ` [Bug c++/53186] " paolo.carlini at oracle dot com
2012-05-03 0:51 ` paolo.carlini at oracle dot com
2012-05-03 6:43 ` vincenzo.innocente at cern dot ch
2012-05-03 6:46 ` vincenzo.innocente at cern dot ch
2012-05-03 14:29 ` paolo at gcc dot gnu.org
2012-05-03 14:32 ` paolo at gcc dot gnu.org
2012-05-03 14:33 ` paolo.carlini at oracle dot com
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