<div dir="ltr">I noticed something else, I just made a change to my x86 wawanalyzer and make it again. And I can't see the change in my output. So the problem is with all my targets. <div>After I ran my first sunctionpass in x86, I needed to crosscopmpile LLVM so I ran the following instructions a couple of days ago:</div><div><div>$ cd <llvm_build_dir></div><div>$ <PATH_TO_SOURCE>/configure --enable-targets=arm --disable-optimized</div><div>--prefix=/usr/local/llvm-arm --target=armv7a-unknown-linux-gnueabi</div><div>$ make && sudo make install</div></div><div>Does my problem have to do something with these instructions?</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Nov 17, 2015 at 11:29 AM, fateme Hoseini <span dir="ltr"><<a href="mailto:hoseini.f@gmail.com" target="_blank">hoseini.f@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Yes, I have done exactly the same. The wawanalyzer is the same. I changed ARM.h and ARMTargetMachine.cpp in the tager/arm folder. then I make tool/llc and lib folder. </div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Nov 17, 2015 at 10:55 AM, John Criswell <span dir="ltr"><<a href="mailto:jtcriswel@gmail.com" target="_blank">jtcriswel@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"><span>
<div>On 11/17/15 12:16 AM, fateme Hoseini
via llvm-dev wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr"><span>Hi, </span><br>
<span>So, I run my pass in X86 target with llc command and it
printed out "hello****". Now I am trying to do the same pass
for ARM target. So I did exactly what I did for X86 as
mentioned in my previous posts. When I run the following
command: </span><br>
</div>
</blockquote>
<br></span>
Have you modified the ARM code generator to run your pass (the same
way that you modified the X86 code generator to run your pass)?<br>
<br>
Each backend has code that configures the set of
MachineFunctionPass'es to run when that code generator is used. For
each backend, you must modify that code to run your
MachineFunctionPass.<br>
<br>
Regards,<br>
<br>
John Criswell<div><div><br>
<br>
<blockquote type="cite">
<div dir="ltr"><span>llc -march=arm test.ll -o test </span><br>
<span>nothing prints out. I did the same for MIPS target too and
I got no result. Can anyone tell me what I'm doing wrong. Is
there any difference between writing machinefunction passes in
x86 and other targets? </span><br>
<span>Thank you, </span><br>
<span>Fami </span><br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Fri, Nov 6, 2015 at 10:56 AM, fateme
Hoseini <span dir="ltr"><<a href="mailto:hoseini.f@gmail.com" target="_blank">hoseini.f@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote">
<div dir="ltr">Hi
<div>So I m trying to write my first backend pass. I
created a file in target\x86\wawanalyzer.cpp based on
hexagonHardwareLoops.cpp file. Now it's just a simple
file that prints hello to the output. I have attached
the file to this post.</div>
<div><br>
</div>
<div>Then I did the following:</div>
<div><br>
</div>
<div>1. add "FunctionPass *createwawAnalyzer();" line to
x86.h</div>
<div>2. add file name to CMakelist.txt.</div>
<div>3. This is going to run after postRAscheduler and
before code emission so I changed the
x86TrgetMachine.cpp as follow:</div>
<div>
<div>void X86PassConfig::addPreEmitPass() {</div>
<div>/////////////add mypass here///////</div>
<div> addPass(createwawAnalyzer());</div>
<div>//////////////////////////////////</div>
<div><span> </span></div>
<div> if (getOptLevel() != CodeGenOpt::None)</div>
<div>
addPass(createExecutionDependencyFixPass(&X86::VR128RegClass));</div>
<div><br>
</div>
<div> if (UseVZeroUpper)</div>
<div> addPass(createX86IssueVZeroUpperPass());</div>
<div><br>
</div>
<div> if (getOptLevel() != CodeGenOpt::None) {</div>
<div> addPass(createX86PadShortFunctions());</div>
<div> addPass(createX86FixupLEAs());</div>
<div> }</div>
</div>
<div>then I run make on mypass and remake llvm3.7\lib and
llvm3.7\tool\llc.</div>
<div>but when I run llc -help it doesn't show my pass. Did
I miss some steps or did something wrong? What's the
correct way to run the pass with llc command?</div>
<div><br>
</div>
<div>I appreciate any help,</div>
<div>Regards</div>
<div>Fami</div>
</div>
<div>
<div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Nov 4, 2015 at 1:02
PM, fateme Hoseini <span dir="ltr"><<a href="mailto:hoseini.f@gmail.com" target="_blank"></a><a href="mailto:hoseini.f@gmail.com" target="_blank">hoseini.f@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote">
<div dir="ltr">Thank you so much.
<div>That helped alot.</div>
<div><br>
</div>
<div>Fami</div>
</div>
<div>
<div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Nov 4, 2015
at 9:40 AM, John Criswell <span dir="ltr"><<a href="mailto:jtcriswel@gmail.com" target="_blank"></a><a href="mailto:jtcriswel@gmail.com" target="_blank">jtcriswel@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote">
<div><span>
<div>On 11/3/15 7:54 PM, fateme
Hoseini wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Dear John,
<div>Thank you so much for your
help. I looked at those
documents. Could you kindly
answer the following
questions:</div>
<div><br>
</div>
<div>Does it mean that I have to
make my own backend target in
order to write a machine pass
even if I want to run a simple
machinefunction pass? for
example,if I want my pass to
get MIPS instructions as an
input, I have to copy all the
files from mips target and add
a file to it which implements
my pass. and there should be a
way to connect the pass to
other MIPS backend files? <br>
</div>
</div>
</blockquote>
<br>
</span> No, you do not need to create
a new backend. All you need to do is
to add your pass to the list of passes
that are run when the MIPS code
generator is used.<br>
<br>
In LLVM 3.3, there was a file in the
X86 backend that had code to schedule
all the MachineFunctionPass'es when
the X86 code generator was used. That
was in
lib/Target/X86/X86TargetMachine.cpp.
You can probably find a similar file
for LLVM 3.7 for the MIPS backend.<br>
<br>
So, to summarize, you'll add your
source file to the MIPS backend, add a
line somewhere to run your pass when
the MIPS code generator is used, and
then recompile llvm/lib and
llvm/tools/llc.<span><br>
<br>
<br>
<blockquote type="cite">
<div dir="ltr">
<div><br>
</div>
<div>As a result, is the way
that I described in my first
post completely wrong because
I cannot run a stand alone
machine function pass like a
frontend function pass?</div>
</div>
</blockquote>
<br>
</span> As far as I know, there is no
way to load a MachineFunctionPass and
run it using llc, opt, or clang. I
believe you need to compile it into
the MIPS backend code.<span><br>
<br>
<blockquote type="cite">
<div dir="ltr">
<div><br>
</div>
<div>Also another question, I'm
a PhD student and I'm
completely new to the llvm
backend process. I want to
estimate my project time. How
long approximately do you
think it will take to be get
familiar with backend and be
able to write machinefunction
pass? for further steps I have
to implement a register
allocation algorithm.</div>
</div>
</blockquote>
<br>
</span> It's difficult to estimate
(especially since I haven't
implemented anything as complicated as
a register allocator). Your profiling
pass may take anywhere from 1 week to
1 month depending on how complicated
it is. I think a register allocator
would take anywhere from 1 month up to
6 months depending on how robust you
need it to be, but since I've never
built one, I can't say for certain.<br>
<br>
Regards,<br>
<br>
John Criswell
<div>
<div><br>
<br>
<blockquote type="cite">
<div dir="ltr">
<div><br>
</div>
<div>Regards,</div>
<div>Fami</div>
<div><br>
</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On
Tue, Nov 3, 2015 at 3:52 PM,
John Criswell <span dir="ltr"><<a href="mailto:jtcriswel@gmail.com" target="_blank"></a><a href="mailto:jtcriswel@gmail.com" target="_blank">jtcriswel@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote">
<div>
<div>Dear Fami,<br>
<br>
A MachineFunctionPass
is run by the code
generator, so you can
only use it in tools
like llc, clang, and
libLTO. The opt
program only
manipulates LLVM IR
and therefore does not
run
MachineFunctionPass'es.<br>
<br>
Regarding
documentation, have
you looked at the
following?<br>
<br>
<a href="http://llvm.org/docs/WritingAnLLVMBackend.html" target="_blank"></a><a href="http://llvm.org/docs/WritingAnLLVMBackend.html" target="_blank">http://llvm.org/docs/WritingAnLLVMBackend.html</a><br>
<a href="http://llvm.org/docs/CodeGenerator.html" target="_blank"></a><a href="http://llvm.org/docs/CodeGenerator.html" target="_blank">http://llvm.org/docs/CodeGenerator.html</a><br>
<a href="http://llvm.org/docs/MIRLangRef.html" target="_blank"></a><a href="http://llvm.org/docs/MIRLangRef.html" target="_blank">http://llvm.org/docs/MIRLangRef.html</a><br>
<br>
Regards,<br>
<br>
John Criswell
<div>
<div><br>
<br>
On 11/3/15 3:47
PM, fateme Hoseini
via llvm-dev
wrote:<br>
</div>
</div>
</div>
<blockquote type="cite">
<div>
<div>
<div dir="ltr">
<div>Hi
everyone,</div>
<div>I am a LLVM
newbie. I need
to write a
machinefunction
pass for my
project. This
should be an
analyzer of
the machine
code to do
some
profiling. I
have written a
couple of
function
passes for
front end, but
it seems they
are completely
different. I
searched
through forum
and llvm
documents, but
couldn't find
anything
useful or
questions were
unanswered.
Can anyone
reference me
to any
material on
how to do that
or help me
with my
roblem.</div>
<div><br>
</div>
<div>I have
created a
folder in:
lib/Transform
and put my
pass in it.</div>
<div>I am
writing a
simple pass
like this:</div>
<div><br>
</div>
<div>using
namespace
llvm;</div>
<div><br>
</div>
<div>namespace {</div>
<div><span> </span></div>
<div> struct
analyzer :
public
MachineFunctionPass
{</div>
<div><span> </span>static
char ID; </div>
<div><span> </span>analyzer()
:
MachineFunctionPass(ID)
{}<span> </span>
<span> </span></div>
<div><span> </span></div>
<div><span> </span>virtual
bool
runOnMachineFunction(MachineFunction
&MF) {<span>
</span></div>
<div><span> </span>errs()
<<
"hello " ;</div>
<div><span> </span></div>
<div><span> </span>return
false;<span> </span></div>
<div><span> </span>}</div>
<div> };</div>
<div>}</div>
<div>char
analyzer::ID =
0;</div>
<div>static
RegisterPass<analyzer>
X("analyzer",
"WAW
analyzer");</div>
<div><br>
</div>
<div>I make it
successfully.
But when I
load it for my
test code I
get this
error:</div>
<div><br>
</div>
<div>
<div>Pass 'WAW
analyzer' is
not
initialized.</div>
<div>Verify if
there is a
pass
dependency
cycle.</div>
<div>Required
Passes:</div>
<div>opt:
/llvm/llvm-3.7/lib/IR/LegacyPassManager.cpp:635:
void
llvm::PMTopLevelManager::schedulePass(llvm::Pass*):
Assertion `PI
&&
"Expected
required
passes to be
initialized"'
failed.</div>
<div>.....</div>
</div>
<div><br>
</div>
<div>I don't
know how to
solve it? Do
we have to run
machinefunction
passes with
OPT command?
Is this
correct to put
machinefunction
pass in an
external
folder or do
we have to
change some
llvm built-in
files? </div>
<div><br>
</div>
<div>Regards,<br>
</div>
<div>Fami</div>
<div><br>
</div>
</div>
<br>
<fieldset></fieldset>
<br>
</div>
</div>
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<span> </span></blockquote>
<span> <br>
<br>
<pre cols="72">--
John Criswell
Assistant Professor
Department of Computer Science, University of Rochester
<a href="http://www.cs.rochester.edu/u/criswell" target="_blank">http://www.cs.rochester.edu/u/criswell</a></pre>
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<pre cols="72">--
John Criswell
Assistant Professor
Department of Computer Science, University of Rochester
<a href="http://www.cs.rochester.edu/u/criswell" target="_blank">http://www.cs.rochester.edu/u/criswell</a></pre>
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<pre cols="72">--
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Assistant Professor
Department of Computer Science, University of Rochester
<a href="http://www.cs.rochester.edu/u/criswell" target="_blank">http://www.cs.rochester.edu/u/criswell</a></pre>
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