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BLD: Add Cython Coverage option #54453

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BLD: Add Cython Coverage option #54453

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f90433b
BLD: Add Cython Coverage option
lithomas1 Aug 7, 2023
7f1b4c3
bump more
lithomas1 Aug 8, 2023
ead496f
fix segfault by declaring gil correctly
lithomas1 Aug 9, 2023
2a11d7d
Merge branch 'main' into cy-coverage
lithomas1 Dec 6, 2023
7db484a
Merge branch 'main' into cy-coverage
lithomas1 Dec 20, 2023
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1 change: 1 addition & 0 deletions meson.build
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Expand Up @@ -27,6 +27,7 @@ add_project_arguments('-DNPY_NO_DEPRECATED_API=0', language : 'cpp')
add_project_arguments('-DNPY_TARGET_VERSION=NPY_1_21_API_VERSION', language : 'c')
add_project_arguments('-DNPY_TARGET_VERSION=NPY_1_21_API_VERSION', language : 'cpp')

cython_coverage = get_option('CYTHON_COVERAGE')

if fs.exists('_version_meson.py')
py.install_sources('_version_meson.py', subdir: 'pandas')
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1 change: 1 addition & 0 deletions meson.options
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@@ -0,0 +1 @@
option('CYTHON_COVERAGE', type: 'boolean', value: false)
13 changes: 11 additions & 2 deletions pandas/_libs/meson.build
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Expand Up @@ -56,8 +56,6 @@ _intervaltree_helper = custom_target('intervaltree_helper_pxi',
)
_khash_primitive_helper_dep = declare_dependency(sources: _khash_primitive_helper)

subdir('tslibs')

libs_sources = {
# Dict of extension name -> dict of {sources, include_dirs, and deps}
# numpy include dir is implicitly included
Expand Down Expand Up @@ -109,6 +107,17 @@ cython_args = [
if get_option('buildtype') == 'debug'
cython_args += ['--gdb']
endif
if cython_coverage
cython_args += ['-X linetrace=true']
# Linetrace is not enough to ensure coverage is turned on
add_project_arguments('-DCYTHON_TRACE=1', language : 'c')
add_project_arguments('-DCYTHON_TRACE=1', language : 'cpp')

add_project_arguments('-DCYTHON_TRACE_NOGIL=1', language : 'c')
add_project_arguments('-DCYTHON_TRACE_NOGIL=1', language : 'cpp')
endif

subdir('tslibs')

foreach ext_name, ext_dict : libs_sources
py.extension_module(
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2 changes: 1 addition & 1 deletion pandas/_libs/parsers.pyx
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Expand Up @@ -320,7 +320,7 @@ cdef double round_trip_wrapper(const char *p, char **q, char decimal,

cdef char* buffer_rd_bytes_wrapper(void *source, size_t nbytes,
size_t *bytes_read, int *status,
const char *encoding_errors) noexcept:
const char *encoding_errors) noexcept nogil:
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Needed to mark this as nogil or we would segfault since the tracing code would try to use GIL requiring code (and this function would be called in a nogil block).

I'm pretty sure the C code can acquire the GIL for itself when it needs it so nogil isn't needed?

cc @WillAyd

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Yea it looks like the C code does ensure the GIL. I'm a little unclear then though - isn't marking this nogil incorrect since it actually uses the GIL?

return buffer_rd_bytes(source, nbytes, bytes_read, status, encoding_errors)

cdef void del_rd_source_wrapper(void *src) noexcept:
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4 changes: 2 additions & 2 deletions pandas/_libs/window/meson.build
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@@ -1,7 +1,7 @@
py.extension_module(
'aggregations',
['aggregations.pyx'],
cython_args: ['-X always_allow_keywords=true'],
cython_args: cython_args,
include_directories: [inc_np, inc_pd],
subdir: 'pandas/_libs/window',
override_options : ['cython_language=cpp'],
Expand All @@ -11,7 +11,7 @@ py.extension_module(
py.extension_module(
'indexers',
['indexers.pyx'],
cython_args: ['-X always_allow_keywords=true'],
cython_args: cython_args, #['-X always_allow_keywords=true'],
include_directories: [inc_np, inc_pd],
subdir: 'pandas/_libs/window',
install: true
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