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tldr/pages/common/filecheck.md
Managor 5305776d45
*: capitalize the first letter after "Note:" (#16226)
Co-authored-by: Machiavelli <145562237+MachiavelliII@users.noreply.github.com>
2025-05-04 05:15:17 +03:00

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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}}