How to run pass without opt tool in clang 16

Beginners
,
1

I have written my own pass with Transformation. I am able to run my pass using opt but I want to run using clang (version 16) directly .

I run the command
clang -Xclang -load -Xclang ./LLVMMyHello.so input.c
This command creates an executable file from inp file but does not show any output from my pass .

Anyone help me to run my own pass .
Also , want to know how to delete a pass from building in optimization . I have seen bugpoint and it is reduction the passes to be run . If anyone can help me to remove passes from schedule pass .

Will it work if I comment out in PassRegistry.def

2

You need to register with newPM, LLVM has an entire dedicated infrastructure for that now.

I suggest you start with adding your pass with add_llvm_pass_plugin, which lets the build system get most of the job done, the rest is implementing a few interface functions, assume your PassPlugin is called XXX:

void PassBuilderCallBack(PassBuilder &PB) {
 // You register your NPM pass here
}
PassPluginLibraryInfo getXXXPluginInfo() {
  return {LLVM_PLUGIN_API_VERSION, "XXX", LLVM_VERSION_STRING,
          PassBuilderCallBack};

}
extern "C" LLVM_ATTRIBUTE_WEAK PassPluginLibraryInfo llvmGetPassPluginInfo() {
  return getXXXPluginInfo();
}
3

Thanks for your response .

want linux command to run the pass in new PM

On Tue, May 23, 2023 at 9:40 PM Zhang via LLVM Discussion Forums <notifications@llvm.discoursemail.com> wrote:

Naville
May 24

You need to register with newPM, LLVM has an entire dedicated infrastructure for that now

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4

What do you mean linux command, you need to change your pass’s source code as well

5

Yes . I did everything .
How my question is how will I run the pass using clang not opt . I ran using opt and it ran .

6

It depends on how you registered your pass, for example if I used PassBuilder::registerOptimizerLastEPCallback, then it should now be ran automatically at the end of of pipeline

7

I got you . Thanks for your help .

On Tue, May 23, 2023 at 11:15 PM Zhang via LLVM Discussion Forums <notifications@llvm.discoursemail.com> wrote:

Naville
May 24

It depends on how you registered your pass, for example if I used PassBuilder::registerOptimizerLastEPCallback, then it should now be ran automatically at the end of of pipeline

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