ffcx.compiler
Main interface for compilation of forms.
Breaks the compilation into several sequential stages. The output of each stage is the input of the next stage.
Compiler stages
Language, parsing
Input: Python code or .ufl file
Output: UFL form
This stage consists of parsing and expressing a form in the UFL form language. This stage is handled by UFL.
Analysis
Input: UFL form
Output: Preprocessed UFL form and FormData (metadata)
This stage preprocesses the UFL form and extracts form metadata. It may also perform simplifications on the form.
Code representation
Input: Preprocessed UFL form and FormData (metadata)
Output: Intermediate Representation (IR)
This stage examines the input and generates all data needed for code generation. This includes generation of finite element basis functions, extraction of data for mapping of degrees of freedom and possible precomputation of integrals. Most of the complexity of compilation is handled in this stage.
The IR is stored as a dictionary, mapping names of UFC functions to data needed for generation of the corresponding code.
Code generation
Input: Intermediate Representation (IR)
Output: C code
This stage examines the IR and generates the actual C code for the body of each UFC function.
The code is stored as a dictionary, mapping names of UFC functions to strings containing the C code of the body of each function.
Code formatting
Input: C code
Output: C code files
This stage examines the generated C++ code and formats it according to the UFC format, generating as output one or more .h/.c files conforming to the UFC format.
Functions
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Generate UFC code for a given UFL objects. |
- ffcx.compiler.analyze_ufl_objects(ufl_objects: List, parameters: Dict) UFLData [source]
Analyze ufl object(s).
- Parameters
ufl_objects –
parameters – FFCx parameters. These parameters take priority over all other set parameters.
holding (Returns a data structure) –
------- –
form_datas – Form_data objects
unique_elements – Unique elements across all forms and expressions
element_numbers – Mapping to unique numbers for all elements
unique_coordinate_elements – Unique coordinate elements across all forms and expressions
expressions – List of all expressions after post-processing, with its evaluation points and the original expression
- ffcx.compiler.compile_ufl_objects(ufl_objects: List[Any], object_names: Dict = {}, prefix: Optional[str] = None, parameters: Dict = {}, visualise: bool = False)[source]
Generate UFC code for a given UFL objects.
- Parameters
ufl_objects (@param) – Objects to be compiled. Accepts elements, forms, integrals or coordinate mappings.
- ffcx.compiler.compute_ir(analysis: UFLData, object_names, prefix, parameters, visualise)[source]
Compute intermediate representation.
- ffcx.compiler.format_code(code, parameters: dict)[source]
Format given code in UFC format. Returns two strings with header and source file contents.
- ffcx.compiler.generate_code(ir, parameters) CodeBlocks [source]
Generate code blocks from intermediate representation.
- ffcx.compiler.time() floating point number
Return the current time in seconds since the Epoch. Fractions of a second may be present if the system clock provides them.