Re: GDC Explorer - an online disassembler for D
On Friday, 21 September 2012 at 03:46:12 UTC, Andrei Alexandrescu
wrote:
I've met Matt Goldbolt, the author of the GCC Explorer at
http://gcc.godbolt.org - a very handy online disassembler for
GCC.
We got to talk a bit about D and he hacked together support for
D by using gdc. Take a look at http://d.godbolt.org, I think
it's pretty darn cool! I'm talking to him about integrating his
work with our servers.
Andrei
Compare a simple C++ to D and the C++ output is far better:
class C
{
int x = 12;
public:
int foo(int y) { return y*x; }
};
int main()
{
C* c = new C();
return c->foo(2);
}
VS
class C
{
int x = 12;
public:
int foo(int y) { return y*x; }
};
int main()
{
C c = new C();
return c.foo(2);
}
operator new(unsigned long)@plt:
jmpQWORD PTR [rip+0x200baa]# 601020 new(unsigned long)@GLIBCXX_3.4>
push 0x1
jmp400450 <.plt>
main:
push rbp
movrbp,rsp
push rbx
subrsp,0x18
movedi,0x4
call 400470
movrbx,rax
movDWORD PTR [rbx],0x0
movrdi,rbx
call 4005bc
movQWORD PTR [rbp-0x18],rbx
movrax,QWORD PTR [rbp-0x18]
movesi,0x2
movrdi,rax
call 4005a4
nop
addrsp,0x18
poprbx
poprbp
ret
nop
C::foo(int):
push rbp
movrbp,rsp
movQWORD PTR [rbp-0x8],rdi
movDWORD PTR [rbp-0xc],esi
movrax,QWORD PTR [rbp-0x8]
moveax,DWORD PTR [rax]
imul eax,DWORD PTR [rbp-0xc]
poprbp
ret
nop
C::C():
push rbp
movrbp,rsp
movQWORD PTR [rbp-0x8],rdi
movrax,QWORD PTR [rbp-0x8]
movDWORD PTR [rax],0xc
nop
poprbp
ret
nopWORD PTR cs:[rax+rax*1+0x0]
nopDWORD PTR [rax+rax*1+0x0]
VS
_Dmain:
push rbp
movrbp,rsp
subrsp,0x10
movrdi,QWORD PTR [rip+0x0]# f <_Dmain+0xf>
call 14 <_Dmain+0x14>
movQWORD PTR [rbp-0x8],rax
movesi,0x2
movrdi,rax
movrax,QWORD PTR [rax]
rex.W call QWORD PTR [rax+0x28]
leave
ret
addBYTE PTR [rax],al
main:
push rbp
movrbp,rsp
subrsp,0x10
movDWORD PTR [rbp-0x10],edi
movQWORD PTR [rbp-0x8],rsi
movrdx,QWORD PTR [rip+0x0]# 16
movrsi,QWORD PTR [rbp-0x8]
movedi,DWORD PTR [rbp-0x10]
call 22
leave
ret
.text.d_dso_init:
push rbp
movrbp,rsp
learax,[rip+0x0]# b <.text.d_dso_init+0xb>
push rax
learax,[rip+0x0]# 13 <.text.d_dso_init+0x13>
push rax
learax,[rip+0x0]# 1b <.text.d_dso_init+0x1b>
push rax
push 0x1
movrdi,rsp
call 26 <.text.d_dso_init+0x26>
leave
ret
the C++ version is more verbose, gives explicit references to
functions and methods while the D version requires you to hunt
and peck.
Re: GDC Explorer - an online disassembler for D
On Friday, 21 September 2012 at 07:40:11 UTC, Andrej Mitrovic wrote: On 9/21/12, Andrei Alexandrescu wrote: snip Integrating this with dpaste would be aweee..sooome! http://dpaste.dzfl.pl/news/change-log---v0.82 Those are in plans for all compilers but atm, we are struggling with problem of exceeding monthly bandwidth. Disassemble output takes a lot of space Anyways, I like design of this website! Very similar to dpaste, which rox ;> Looks very nice, probably we could adapt some ideas to dpaste, like __Compiler options__
Re: GDC Explorer - an online disassembler for D
Ellery Newcomer wrote: > On 09/21/2012 03:04 AM, Jens Mueller wrote: > >But it's nice to have source code and assembly side by side. > > > >Jens > > > > And very nice to have demangled names in assembly. You can pipe your assembly code to ddemangle if there is some other tool that missing demangling. I did this for example when I looked at output from a statistical profiler. Jens
Re: GDC Explorer - an online disassembler for D
On 09/21/2012 03:04 AM, Jens Mueller wrote: But it's nice to have source code and assembly side by side. Jens And very nice to have demangled names in assembly.
Re: GDC Explorer - an online disassembler for D
On 21 September 2012 14:49, bearophile wrote:
>> It seems even this program produces a too much long asm listing for the
>> site:
>>
>> import std.stdio;
>> void main() {
>> writeln("%f", 1.5);
>> }
>
>
> Compiled with:
>
> -O0 -march=native
>
> Bye,
> bearophile
Curse those templates. ;-)
--
Iain Buclaw
*(p < e ? p++ : p) = (c & 0x0f) + '0';
Re: GDC Explorer - an online disassembler for D
It seems even this program produces a too much long asm listing
for the site:
import std.stdio;
void main() {
writeln("%f", 1.5);
}
Compiled with:
-O0 -march=native
Bye,
bearophile
Re: GDC Explorer - an online disassembler for D
I'd like a way to filter the output to the
disassembly of just one (or few) functions, because otherwise
the output risks being too much large.
It seems even this program produces a too much long asm listing
for the site:
import std.stdio;
void main() {
writeln("%f", 1.5);
}
Bye,
bearophile
Re: GDC Explorer - an online disassembler for D
Andrei Alexandrescu: I've met Matt Goldbolt, the author of the GCC Explorer at http://gcc.godbolt.org - a very handy online disassembler for GCC. We got to talk a bit about D and he hacked together support for D by using gdc. Take a look at http://d.godbolt.org, I think it's pretty darn cool! I'm talking to him about integrating his work with our servers. It's a nice idea. I'd like a way to filter the output to the disassembly of just one (or few) functions, because otherwise the output risks being too much large. At my second try I have received this, I don't know why: Bye, bearophile
Re: GDC Explorer - an online disassembler for D
Iain Buclaw wrote: > On 21 September 2012 11:29, Iain Buclaw wrote: > > On 21 September 2012 11:17, Bernard Helyer wrote: > >> On Friday, 21 September 2012 at 10:04:00 UTC, Jens Mueller wrote: > >>> > >>> Andrei Alexandrescu wrote: > > I've met Matt Goldbolt, the author of the GCC Explorer at > http://gcc.godbolt.org - a very handy online disassembler for GCC. > >>> > >>> > >>> This is not a disassembler. It just stops compilation before the > >>> assembler (gcc -S). A dissembler would create the assembler code given > >>> only the machine code. > >> > >> > >> You are both correct and incredibly pedantic. :P > > > > Half correct and incredibly pedantic. :-) > > > > There's two modes. One is assembler output, the other is objdump > > output (which is a disassembler). > > > > And if it doesn't then I must be incredibly confused at this hour in > the morning (yawns). How do I use the objdump mode in the web interface? Jens
Re: GDC Explorer - an online disassembler for D
On 21 September 2012 11:29, Iain Buclaw wrote: > On 21 September 2012 11:17, Bernard Helyer wrote: >> On Friday, 21 September 2012 at 10:04:00 UTC, Jens Mueller wrote: >>> >>> Andrei Alexandrescu wrote: I've met Matt Goldbolt, the author of the GCC Explorer at http://gcc.godbolt.org - a very handy online disassembler for GCC. >>> >>> >>> This is not a disassembler. It just stops compilation before the >>> assembler (gcc -S). A dissembler would create the assembler code given >>> only the machine code. >> >> >> You are both correct and incredibly pedantic. :P > > Half correct and incredibly pedantic. :-) > > There's two modes. One is assembler output, the other is objdump > output (which is a disassembler). > And if it doesn't then I must be incredibly confused at this hour in the morning (yawns). -- Iain Buclaw *(p < e ? p++ : p) = (c & 0x0f) + '0';
Re: GDC Explorer - an online disassembler for D
On 21 September 2012 11:17, Bernard Helyer wrote: > On Friday, 21 September 2012 at 10:04:00 UTC, Jens Mueller wrote: >> >> Andrei Alexandrescu wrote: >>> >>> I've met Matt Goldbolt, the author of the GCC Explorer at >>> http://gcc.godbolt.org - a very handy online disassembler for GCC. >> >> >> This is not a disassembler. It just stops compilation before the >> assembler (gcc -S). A dissembler would create the assembler code given >> only the machine code. > > > You are both correct and incredibly pedantic. :P Half correct and incredibly pedantic. :-) There's two modes. One is assembler output, the other is objdump output (which is a disassembler). -- Iain Buclaw *(p < e ? p++ : p) = (c & 0x0f) + '0';
Re: GDC Explorer - an online disassembler for D
On Friday, 21 September 2012 at 10:04:00 UTC, Jens Mueller wrote: Andrei Alexandrescu wrote: I've met Matt Goldbolt, the author of the GCC Explorer at http://gcc.godbolt.org - a very handy online disassembler for GCC. This is not a disassembler. It just stops compilation before the assembler (gcc -S). A dissembler would create the assembler code given only the machine code. You are both correct and incredibly pedantic. :P
Re: GDC Explorer - an online disassembler for D
Andrei Alexandrescu wrote: > I've met Matt Goldbolt, the author of the GCC Explorer at > http://gcc.godbolt.org - a very handy online disassembler for GCC. This is not a disassembler. It just stops compilation before the assembler (gcc -S). A dissembler would create the assembler code given only the machine code. But it's nice to have source code and assembly side by side. Jens
Re: GDC Explorer - an online disassembler for D
On 2012-09-21 05:47, Andrei Alexandrescu wrote: I've met Matt Goldbolt, the author of the GCC Explorer at http://gcc.godbolt.org - a very handy online disassembler for GCC. We got to talk a bit about D and he hacked together support for D by using gdc. Take a look at http://d.godbolt.org, I think it's pretty darn cool! I'm talking to him about integrating his work with our servers. That's pretty cool. -- /Jacob Carlborg
Re: GDC Explorer - an online disassembler for D
On 9/21/12, Andrei Alexandrescu wrote: > snip Integrating this with dpaste would be aweee..sooome!
Re: GDC Explorer - an online disassembler for D
On 21 September 2012 04:47, Andrei Alexandrescu wrote: > I've met Matt Goldbolt, the author of the GCC Explorer at > http://gcc.godbolt.org - a very handy online disassembler for GCC. > > We got to talk a bit about D and he hacked together support for D by using > gdc. Take a look at http://d.godbolt.org, I think it's pretty darn cool! I'm > talking to him about integrating his work with our servers. > > > Andrei That's awesome. :-) -- Iain Buclaw *(p < e ? p++ : p) = (c & 0x0f) + '0';
GDC Explorer - an online disassembler for D
I've met Matt Goldbolt, the author of the GCC Explorer at http://gcc.godbolt.org - a very handy online disassembler for GCC. We got to talk a bit about D and he hacked together support for D by using gdc. Take a look at http://d.godbolt.org, I think it's pretty darn cool! I'm talking to him about integrating his work with our servers. Andrei
