llvm dev - Sep 2011 - [LLVMdev] statically link pass to clang

Hi all,

A question about statically linking a pass to clang instead of dynamically
loading it at runtime. I am stumped on this bug for a while. I inserted a
pass under lib/Transforms/mypass directory, registered it with
INITIALIZE_PASS and defined createMyPass in the pass. Also I added file
mypass.h in include/llvm/Transforms/ to expose the accessor functions that
expose my passes. Entries are added in include/llvm/LinkAllPasses.h to force
pass linking. The archive files of my passes are added to LINK_COMPONENTS in
the Makefiles for opt and clang. However, the passes are still not
statically linked. Is there a way to statically link a pass into clang? If
possible, how do turn on and off my passes with command line options?

I am trying to use clang as a c and c++ compiler. I can walk around this by
compiling source into bitcode and then invoke opt which dynamically loads my
passes and then compile it into x86 assembly with llc. How can I pass some
command line options for clang such as -fomit-frame-pointer to llc so that
frame pointer is  reserved? Thank you so much in advance.

Bin Zeng
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2011/9/24 Zeng Bin <ezengbin at gmail.com>:
> A question about statically linking a pass to clang instead of dynamically
> loading it at runtime. I am stumped on this bug for a while. I inserted a
> pass under lib/Transforms/mypass directory, registered it with
> INITIALIZE_PASS and defined createMyPass in the pass. Also I added file
> mypass.h in include/llvm/Transforms/ to expose the accessor functions that
> expose my passes. Entries are added in include/llvm/LinkAllPasses.h to
force
> pass linking. The archive files of my passes are added to LINK_COMPONENTS
in
> the Makefiles for opt and clang. However, the passes are still not
> statically linked. Is there a way to statically link a pass into clang? If
> possible, how do turn on and off my passes with command line options?
I don't think include/llvm/LinkAllPasses.h would affect clang.
Did you see lib/Transforms/IPO/PassManagerBuilder.cpp ?

...Takumi

2011/9/27 Zeng Bin <ezengbin at gmail.com>:
>
>
> On Sun, Sep 25, 2011 at 8:45 PM, NAKAMURA Takumi <geek4civic at
gmail.com>
> wrote:
>>
>> 2011/9/24 Zeng Bin <ezengbin at gmail.com>:
>> > A question about statically linking a pass to clang instead of
>> > dynamically
>> > loading it at runtime. I am stumped on this bug for a while. I
inserted
>> > a
>> > pass under lib/Transforms/mypass directory, registered it with
>> > INITIALIZE_PASS and defined createMyPass in the pass. Also I added
file
>> > mypass.h in include/llvm/Transforms/ to expose the accessor
functions
>> > that
>> > expose my passes. Entries are added in
include/llvm/LinkAllPasses.h to
>> > force
>> > pass linking. The archive files of my passes are added to
>> > LINK_COMPONENTS in
>> > the Makefiles for opt and clang. However, the passes are still not
>> > statically linked. Is there a way to statically link a pass into
clang?
>> > If
>> > possible, how do turn on and off my passes with command line
options?
>>
>> I don't think include/llvm/LinkAllPasses.h would affect clang.
>> Did you see lib/Transforms/IPO/PassManagerBuilder.cpp ?
>>
>> ...Takumi
>
> Hi Takumi,
>
> Thank you very much for the reply. There is no  file called
> PassManagerBuilder.cpp in lib/Transforms/IPO/. I am using LLVM 2.8.
Then, seek StandardPasses.h in include/llvm.
IMO, you should take top of trunk if you would play with clang. 2.8 is too old.
3.0 branch will come soon.

...Takumi

Bin, please don't send only to me, but CC to llvmdev. or you would not
receive 3rd person's answer.

2011/9/27 Zeng Bin <ezengbin at gmail.com>:
> Thanks a lot for the info. Now my passes are linked into clang. Is there a
> way to pass a parameter to clang to turn off my passes? With opt, you can
> disable a pass by command line switch -mypass. Can you do that with clang?
Try to ask on cfe-dev ;)

..Takumi