https://github.com/sloorush/llvm-pass-learn

Small dummy llvm pass created while learning how to write a llvm pass.
https://github.com/sloorush/llvm-pass-learn

Last synced: about 1 month ago
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Small dummy llvm pass created while learning how to write a llvm pass.

• Host: GitHub
• URL: https://github.com/sloorush/llvm-pass-learn
• Owner: sloorush
• Created: 2022-10-19T06:04:24.000Z (over 2 years ago)
• Default Branch: master
• Last Pushed: 2022-10-19T14:37:13.000Z (over 2 years ago)
• Last Synced: 2024-05-02T03:43:44.855Z (9 months ago)
• Language: C++
• Homepage:
• Size: 21.5 KB
• Stars: 1
• Watchers: 1
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# llvm-pass-learn

A dummy LLVM pass collection made to learn.

It's for LLVM 14.

Build:

    $ cd llvm-pass-skeleton

    $ mkdir build

    $ cd build

    $ cmake ..

    $ make

    $ cd ..

## Logger Pass

A dummy LLVM pass to log the LLVM IR and get the functions, basic blocks, and instructions.

Run:

    $ clang -flegacy-pass-manager -Xclang -load -Xclang build/logger/libLoggerPass.* a.cpp

## BadCalculator Pass

A bad calculator that changes you first addition to multiplication

Run:

    $ clang -flegacy-pass-manager -Xclang -load -Xclang build/badCalculator/libBadCalculatorPass.* a.cpp

  Example

  

  ```

❯ clang a.cpp

❯ ./a.out

❯ echo $?

6

❯ ./a.out a b c

❯ echo $?

9

❯ clang -flegacy-pass-manager -Xclang -load -Xclang build/badCalculator/libBadCalculatorPass.* a.cpp

HOHOHO Bad calculator

❯ ./a.out

❯ echo $?

5

❯ ./a.out a b c

❯ echo $?

20

  ```

## First operator

Logs the result of the first binary operation

  Example

  

  ```

❯ cc -c rtlib.c

❯ clang -flegacy-pass-manager -Xclang -load -Xclang build/firstOperator/libFirstOperatorPass.so -c a.cpp

❯ cc rtlib.o a.o -o exe

❯ ./exe

computed: 6

  ```

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Skeleton to write the LLVM pass was picked up from -> https://github.com/sampsyo/llvm-pass-skeleton