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import tempfile |
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from sympy.external import import_module |
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from sympy.printing.codeprinter import ccode |
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from sympy.utilities._compilation import compile_link_import_strings, has_c |
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from sympy.utilities._compilation.util import may_xfail |
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from sympy.testing.pytest import skip, skip_under_pyodide |
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from sympy.codegen.ast import ( |
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FunctionDefinition, FunctionPrototype, Variable, Pointer, real, Assignment, |
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integer, CodeBlock, While |
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) |
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from sympy.codegen.cnodes import void, PreIncrement |
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from sympy.codegen.cutils import render_as_source_file |
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cython = import_module('cython') |
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np = import_module('numpy') |
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def _mk_func1(): |
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declars = n, inp, out = Variable('n', integer), Pointer('inp', real), Pointer('out', real) |
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i = Variable('i', integer) |
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whl = While(i<n, [Assignment(out[i], inp[i]), PreIncrement(i)]) |
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body = CodeBlock(i.as_Declaration(value=0), whl) |
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return FunctionDefinition(void, 'our_test_function', declars, body) |
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def _render_compile_import(funcdef, build_dir): |
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code_str = render_as_source_file(funcdef, settings={"contract": False}) |
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declar = ccode(FunctionPrototype.from_FunctionDefinition(funcdef)) |
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return compile_link_import_strings([ |
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('our_test_func.c', code_str), |
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('_our_test_func.pyx', ("#cython: language_level={}\n".format("3") + |
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"cdef extern {declar}\n" |
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"def _{fname}({typ}[:] inp, {typ}[:] out):\n" |
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" {fname}(inp.size, &inp[0], &out[0])").format( |
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declar=declar, fname=funcdef.name, typ='double' |
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)) |
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], build_dir=build_dir) |
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@may_xfail |
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@skip_under_pyodide("Emscripten does not support process spawning") |
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def test_copying_function(): |
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if not np: |
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skip("numpy not installed.") |
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if not has_c(): |
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skip("No C compiler found.") |
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if not cython: |
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skip("Cython not found.") |
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info = None |
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with tempfile.TemporaryDirectory() as folder: |
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mod, info = _render_compile_import(_mk_func1(), build_dir=folder) |
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inp = np.arange(10.0) |
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out = np.empty_like(inp) |
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mod._our_test_function(inp, out) |
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assert np.allclose(inp, out) |
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