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antlr4-to-mlir

Description

This project aims to compile a antlr4 grammar into an mlir dialect representing its AST and a lexer/parser compiling into this dialect made with antlr4.

Generated mlir project is built inside a mlir-standalone-template by jmgorius project.

Antlr4 build system is inspired by antlr-cpp by gabriele-tomassetti, tools/antlr-4.13.0-complete.jar and cmake folder come from this repository.

The Antlr4 Antlr4 grmmar is inspired from grammars-v4 but is customized..

Why does this project need the mlir-standalone-template?

Instead of generating mlir files and letting the user putting it together to build mlir using it, antlr4-to-mlir use an instanc of the mlir-standalone-template to generate dialects and modifying the standalone-opt automatically to accept mlir program using generated dialects.

Generated file example

A MiniJava antlr gramamr can be found in example/MiniJava.g4. The generated mlir files for this example can be found in example/MiniJava/. There is no example of antlr generated project because it mainly constist of wrapping the antlr grammar into the build system and adding a visitor that syntaxically transform you program into the mlir generated dialect.

How to build and use?

How to build and use antlr4-to-mlir?

To build and use this tool, you need to have a non-modified version of mlir-standalone-template in $STANDALONE_DIR. $ANTLR_GENERATION_FOLDER represent a folder in which you want to generate antlr-generated project. To build, run

mkdir build && cd build
cmake .. -DMLIR_STANDALONE_PATH=$STANDALONE_DIR -DANTLR_GENERATION_PATH=$ANTLR_GENERATION_FOLDER
make

This will create an executable Antlr4ToMlir that can be used either to initialize the mlir-standalone-project to be usable by antlr4-to-mlir or to generate AST dialects and frontends.

Initialization

To initialize the mlir-standalone-project, run ./Antlr4ToMlir --init, this will add markers to make it easier to add new dialects and a dialect called AutoAstUtils. AutoAstUtils dialect is used to have a common base for every generated AST dialect and it represents base common element such as INT or STRING values. Once the mlir-standalone-project is initialized it can be manually modified without breaking how antlr4-to-mlir works as long as markers are not removed. the mlir-standalone-project with be automatically initialized if not done manually during the first use.

AST dialect and frontend generation

To generate the AST dialect and the ANTLR project for an antlr-grammar MyGrammar with a starting rule startingRule, run ./Antlr4ToMlir /path/to/MyGrammar.g4 startingRule. This will create an ANTLR project in folder $ANTLR_GENERATION_FOLDER/MyGrammar and a MyGrammar dialect in the mlir-standalone-project.

How to build and use the generated ANTLR project?

To build the generated ANTLR project for a grammar MyGrammar run

mkdir $ANTLR_GENERATION_FOLDER/MyGrammar/build && cd $ANTLR_GENERATION_FOLDER/MyGrammar/build
cmake ..
make

This will create an executable called MyGrammar usable to compile a MyGrammar program into an mlir program using the generated AST and the AutoAstUtils dialects. To use it, run ./MyGrammar [input file] [output file].

How to build and use mlir-standalone-project?

To build and use the mlir-standalone-project, refers to the original git project, here.

License

This frontend generator is made available under the Apache License 2.0 with LLVM Exceptions. See the LICENSE.txt file for more details.