llvm/docs/CommandGuide/llvm-cgdata.rst

llvm-cgdata - LLVM CodeGen Data Tool
====================================

.. program:: llvm-cgdata

SYNOPSIS
--------

:program:`llvm-cgdata` [**commands**] [**options**] (<binaries>|<.cgdata>)

DESCRIPTION
-----------

The :program:llvm-cgdata utility parses raw codegen data embedded
in compiled binary files and merges them into a single .cgdata file.
It can also inspect and manipulate .cgdata files.
Currently, the tool supports saving and restoring outlined hash trees,
enabling global function outlining across modules, allowing for more
efficient function outlining in subsequent compilations.
The design is extensible, allowing for the incorporation of additional
codegen summaries and optimization techniques, such as global function
merging, in the future.

COMMANDS
--------

At least one of the following commands are required:

.. option:: --convert

  Convert a .cgdata file from one format to another.

.. option:: --merge

  Merge multiple raw codgen data in binaries into a single .cgdata file.

.. option:: --show

  Show summary information about a .cgdata file.

OPTIONS
-------

:program:`llvm-cgdata` supports the following options:

.. option:: --format=[text|binary]

  Specify the format of the output .cgdata file.

.. option:: --output=<string>

  Specify the output file name.

.. option:: --cgdata-version

  Print the version of the llvm-cgdata tool.

EXAMPLES
--------

To convert a .cgdata file from binary to text format:
    $ llvm-cgdata --convert --format=text input.cgdata --output=output.data

To merge multiple raw codegen data in object files into a single .cgdata file:
    $ llvm-cgdata --merge file1.o file2.o --output=merged.cgdata

To show summary information about a .cgdata file:
    $ llvm-cgdata --show input.cgdata