Liberty Parser & Modifier

A Python binding for parsing and modifying Liberty (.lib) files.

Prerequisites

• CMake (>= 3.10)
• Python3 with development headers
• pybind11
• C++17 compatible compiler

Building

1. Create and enter build directory:

mkdir build
cd build

2. Configure CMake:

cmake ..

3. Build:

make

This will generate a Python module named liberty_api.

Usage Example

import liberty_api

# 1) Parse Liberty file
pvt, cells = liberty_api.parse_liberty(
    lib_file="/path/to/input.lib",    # Input Liberty file
    process="FF",                      # Process corner (SS/TT/FF)
    dump_json_file="test.json"        # Optional: dump parse result to JSON
)

# Access parse results
print("Voltage =", pvt.voltage)
print("Temperature =", pvt.temperature)

for c in cells:
    print("Cell:", c.cell_name)
    print("  #output pins:", len(c.output_pins))
    print("  #input pins:", len(c.input_pins))

# 2) Modify Liberty file
success = liberty_api.modify_liberty(
    original_lib_file="/path/to/input.lib",  # Original Liberty file
    json_file="test.json",                   # JSON file with modifications
    output_lib_file="modified.lib"           # Output Liberty file
)
print("Modify success?", success)

API Reference

liberty_api.parse_liberty()

Parse Liberty file and optionally dump to JSON.

Parameters:

• lib_file (str): Path to input Liberty file
• process (str): Process corner ("SS"/"TT"/"FF"), default "TT"
• dump_json_file (str): Optional path to dump parse results as JSON

Returns:

• Tuple(PVT, List[CellInfo]): PVT information and list of cell data

liberty_api.modify_liberty()

Modify Liberty file using JSON data.

Parameters:

• original_lib_file (str): Path to original Liberty file
• json_file (str): Path to JSON file containing modifications
• output_lib_file (str): Path to write modified Liberty file

Returns:

• bool: True if successful, False otherwise