FileCheck

Flexible pattern matching file verifier. It is typically used from LLVM regression tests and forms a part of a lit test. More information: https://llvm.org/docs/CommandGuide/FileCheck.html.

• Match input_file content with pattern file check_file:

FileCheck --input-file=path/to/input_file path/to/check_file

• Match input from the stdin with pattern file check_file:

echo "some_text" | FileCheck path/to/check_file

• Match with the specified custom check prefix (Note: the default prefix is CHECK):

echo "some_text" | FileCheck --check-prefix=prefix path/to/check_file

• Print good directive pattern matches:

echo "some_text" | FileCheck -v path/to/check_file

• Input llvm_code.ll into llvm-as, then pipe the output into FileCheck to match:

llvm-as path/to/llvm_code.ll | FileCheck path/to/check_file