accparser (ACCP): a standalone OpenACC parser based on ANTLR 4. It supports both C and Fortran. The generated OpenACC AST can be converted to OpenMP AST. The OpenMP AST is represented by OpenMPIR from ompparser.

accparser requires ANTLR 4 and its C++ runtime, which are available on Ubuntu 20.04 or later. For other systems, they may need to be manually built.

sudo apt update sudo apt install -y \ antlr4 \ libantlr4-runtime-dev \ build-essential \ g++ \ cmake

clang/clang++ and gcc/g++ are both fine.

mkdir build cd build cmake .. make

It will produce a library libaccparser.so and an executable acc_demo.out

Optionally, we can also enable the OpenMP translator.

git submodule update --init mkdir build cd build cmake -DUSE_OMPPARSER=true -DCMAKE_INSTALL_PREFIX=../accparser-install .. make install

Given a test file foo.txt with the following content to try accparser.

Input:

#pragma acc parallel private(a, b, c)

./acc_demo.out ./foo.txt

The output includes the OpenACC source code, recognized tokens, parse tree, and the OpenACC code unparsed from the generated OpenACC IR.

Output:

====================================== Line: 1 GIVEN INPUT: #pragma acc parallel private(a, b, c) ====================================== TOKEN : TOKEN_STRING ACC :"acc" PARALLEL :"parallel" PRIVATE :"private" LEFT_PAREN :"(" EXPR :"a" EXPR :"b" EXPR :"c" RIGHT_PAREN :")" EOF :"<EOF>" ====================================== PARSE TREE: (accparallelprivate(abc)<EOF> acc (parallelprivate(abc) (parallelprivate(abc) parallel (private(abc) (private(abc) (private(abc) private ( (abc (a a) (b b) (c c)) )))))) <EOF>) ====================================== GENERATED OUTPUT: #pragma acc parallel private (a, b, c) ======================================

At each line of the parse tree section, the output follows the format (root child_1 child_2 ... child_n). For example, the first line shows that the root is accparallelprivate(abc). Its children include acc and parallelprivate(abc). The latter has its own children that are listed at other lines.