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Define allow_backprop in McXtrace TRACE sections #401

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Merged
g5t merged 1 commit into from
Oct 20, 2026
Merged

Define allow_backprop in McXtrace TRACE sections #401

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2 changes: 1 addition & 1 deletion src/mccode_antlr/translators/c_trace.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@ def _runtime_parameters(flavor: Flavor):
if Flavor.MCSTAS == flavor:
pars.extend(['vx', 'vy', 'vz', 't', 'sx', 'sy', 'sz', 'p', 'mcgravitation', 'mcMagnet', 'allow_backprop'])
elif Flavor.MCXTRACE == flavor:
pars.extend(['kx', 'ky', 'kz', 'phi', 't', 'Ex', 'Ey', 'Ez', 'p'])
pars.extend(['kx', 'ky', 'kz', 'phi', 't', 'Ex', 'Ey', 'Ez', 'p', 'allow_backprop'])
else:
raise ValueError(f'Unknown flavor {flavor}')
# Add the temporary particle parameters added sometime after v3.4.0 ... to the v3.4.0 tag
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10 changes: 10 additions & 0 deletions tests/test_trace_allow_backprop.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,10 @@
from mccode_antlr import Flavor
from mccode_antlr.translators.c_trace import def_trace_section, undef_trace_section


def test_allow_backprop_defined_in_trace():
# The runtime macros (PROP_*, DISALLOW_BACKPROP) use `allow_backprop` for both
# flavors, McXtrace since McCode v3.6.9 -- see mccode-dev/mccode-antlr#118
for flavor in (Flavor.MCSTAS, Flavor.MCXTRACE):
assert '#define allow_backprop (_particle->allow_backprop)' in def_trace_section(flavor)
assert '#undef allow_backprop' in undef_trace_section(flavor)
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