Generated kernel names

FFCx normally identifies generated integral kernels using a hash of the UFL form and compiler state. When compiling a Python UFL file with the ffcx command, FFCx additionally emits a stable kernel function name derived from the Python variable containing the form. For example,

mass = inner(u, v) * dx

produces a function named using the output namespace, form name, integral type, integral-group index and cell type. For an input file named forms.py on a triangular mesh, the name is

tabulate_tensor_forms_mass_cell_0_triangle

The generated header declares this function. The hash-named function remains available as a forwarding symbol for compatibility.

Explicit names

Set ffcx_kernel_name integral metadata to specify the complete function name:

mass = inner(u, v) * dx(metadata={"ffcx_kernel_name": "tabulate_tensor_p1_mass"})

This produces tabulate_tensor_p1_mass exactly: FFCx does not add the output namespace or cell type to an explicit name. Explicit names must contain only letters, digits and underscores, and must not start with a digit. Names must be unique within a generated output file. Integrals that FFCx combines into one kernel must use the same explicit name.

Compilation through the Python API without an object name or explicit ffcx_kernel_name continues to use only the hash-derived kernel name.