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273 lines
8 KiB
Python
273 lines
8 KiB
Python
import os.path
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import re
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from . import common as _common
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# The following C files must not built with Py_BUILD_CORE.
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FILES_WITHOUT_INTERNAL_CAPI = frozenset((
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# Modules/
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'_testcapimodule.c',
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'_testlimitedcapi.c',
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'_testclinic_limited.c',
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'xxlimited.c',
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'xxlimited_35.c',
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))
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# C files in the fhe following directories must not be built with
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# Py_BUILD_CORE.
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DIRS_WITHOUT_INTERNAL_CAPI = frozenset((
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'_testcapi', # Modules/_testcapi/
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'_testlimitedcapi', # Modules/_testlimitedcapi/
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))
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TOOL = 'gcc'
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META_FILES = {
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'<built-in>',
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'<command-line>',
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}
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# https://gcc.gnu.org/onlinedocs/cpp/Preprocessor-Output.html
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# flags:
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# 1 start of a new file
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# 2 returning to a file (after including another)
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# 3 following text comes from a system header file
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# 4 following text treated wrapped in implicit extern "C" block
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LINE_MARKER_RE = re.compile(r'^# (\d+) "([^"]+)"((?: [1234])*)$')
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PREPROC_DIRECTIVE_RE = re.compile(r'^\s*#\s*(\w+)\b.*')
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COMPILER_DIRECTIVE_RE = re.compile(r'''
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^
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(.*?) # <before>
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(__\w+__) # <directive>
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\s*
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[(] [(]
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(
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[^()]*
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(?:
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[(]
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[^()]*
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[)]
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[^()]*
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)*
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) # <args>
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( [)] [)] ) # <closed>
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''', re.VERBOSE)
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POST_ARGS = (
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'-pthread',
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'-std=c99',
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#'-g',
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#'-Og',
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#'-Wno-unused-result',
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#'-Wsign-compare',
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#'-Wall',
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#'-Wextra',
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'-E',
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)
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def preprocess(filename,
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incldirs=None,
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includes=None,
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macros=None,
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samefiles=None,
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cwd=None,
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):
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if not cwd or not os.path.isabs(cwd):
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cwd = os.path.abspath(cwd or '.')
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filename = _normpath(filename, cwd)
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postargs = POST_ARGS
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basename = os.path.basename(filename)
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dirname = os.path.basename(os.path.dirname(filename))
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if (basename not in FILES_WITHOUT_INTERNAL_CAPI
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and dirname not in DIRS_WITHOUT_INTERNAL_CAPI):
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postargs += ('-DPy_BUILD_CORE=1',)
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text = _common.preprocess(
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TOOL,
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filename,
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incldirs=incldirs,
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includes=includes,
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macros=macros,
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#preargs=PRE_ARGS,
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postargs=postargs,
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executable=['gcc'],
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compiler='unix',
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cwd=cwd,
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)
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return _iter_lines(text, filename, samefiles, cwd)
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def _iter_lines(text, reqfile, samefiles, cwd, raw=False):
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lines = iter(text.splitlines())
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# The first line is special.
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# The next two lines are consistent.
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firstlines = [
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f'# 0 "{reqfile}"',
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'# 0 "<built-in>"',
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'# 0 "<command-line>"',
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]
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if text.startswith('# 1 '):
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# Some preprocessors emit a lineno of 1 for line-less entries.
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firstlines = [l.replace('# 0 ', '# 1 ') for l in firstlines]
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for expected in firstlines:
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line = next(lines)
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if line != expected:
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raise NotImplementedError((line, expected))
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# Do all the CLI-provided includes.
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filter_reqfile = (lambda f: _filter_reqfile(f, reqfile, samefiles))
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make_info = (lambda lno: _common.FileInfo(reqfile, lno))
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last = None
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for line in lines:
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assert last != reqfile, (last,)
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lno, included, flags = _parse_marker_line(line, reqfile)
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if not included:
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raise NotImplementedError((line,))
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if included == reqfile:
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# This will be the last one.
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assert not flags, (line, flags)
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else:
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assert 1 in flags, (line, flags)
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yield from _iter_top_include_lines(
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lines,
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_normpath(included, cwd),
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cwd,
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filter_reqfile,
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make_info,
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raw,
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)
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last = included
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# The last one is always the requested file.
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assert included == reqfile, (line,)
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def _iter_top_include_lines(lines, topfile, cwd,
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filter_reqfile, make_info,
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raw):
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partial = 0 # depth
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files = [topfile]
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# We start at 1 in case there are source lines (including blank ones)
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# before the first marker line. Also, we already verified in
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# _parse_marker_line() that the preprocessor reported lno as 1.
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lno = 1
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for line in lines:
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if line == '# 0 "<command-line>" 2' or line == '# 1 "<command-line>" 2':
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# We're done with this top-level include.
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return
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_lno, included, flags = _parse_marker_line(line)
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if included:
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lno = _lno
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included = _normpath(included, cwd)
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# We hit a marker line.
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if 1 in flags:
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# We're entering a file.
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# XXX Cycles are unexpected?
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#assert included not in files, (line, files)
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files.append(included)
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elif 2 in flags:
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# We're returning to a file.
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assert files and included in files, (line, files)
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assert included != files[-1], (line, files)
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while files[-1] != included:
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files.pop()
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# XXX How can a file return to line 1?
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#assert lno > 1, (line, lno)
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else:
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if included == files[-1]:
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# It's the next line from the file.
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assert lno > 1, (line, lno)
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else:
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# We ran into a user-added #LINE directive,
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# which we promptly ignore.
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pass
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elif not files:
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raise NotImplementedError((line,))
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elif filter_reqfile(files[-1]):
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assert lno is not None, (line, files[-1])
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if (m := PREPROC_DIRECTIVE_RE.match(line)):
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name, = m.groups()
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if name != 'pragma':
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raise Exception(line)
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else:
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line = re.sub(r'__inline__', 'inline', line)
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if not raw:
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line, partial = _strip_directives(line, partial=partial)
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yield _common.SourceLine(
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make_info(lno),
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'source',
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line or '',
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None,
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)
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lno += 1
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def _parse_marker_line(line, reqfile=None):
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m = LINE_MARKER_RE.match(line)
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if not m:
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return None, None, None
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lno, origfile, flags = m.groups()
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lno = int(lno)
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assert origfile not in META_FILES, (line,)
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assert lno > 0, (line, lno)
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flags = set(int(f) for f in flags.split()) if flags else ()
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if 1 in flags:
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# We're entering a file.
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assert lno == 1, (line, lno)
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assert 2 not in flags, (line,)
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elif 2 in flags:
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# We're returning to a file.
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#assert lno > 1, (line, lno)
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pass
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elif reqfile and origfile == reqfile:
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# We're starting the requested file.
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assert lno == 1, (line, lno)
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assert not flags, (line, flags)
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else:
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# It's the next line from the file.
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assert lno > 1, (line, lno)
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return lno, origfile, flags
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def _strip_directives(line, partial=0):
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# We assume there are no string literals with parens in directive bodies.
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while partial > 0:
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if not (m := re.match(r'[^{}]*([()])', line)):
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return None, partial
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delim, = m.groups()
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partial += 1 if delim == '(' else -1 # opened/closed
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line = line[m.end():]
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line = re.sub(r'__extension__', '', line)
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line = re.sub(r'__thread\b', '_Thread_local', line)
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while (m := COMPILER_DIRECTIVE_RE.match(line)):
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before, _, _, closed = m.groups()
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if closed:
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line = f'{before} {line[m.end():]}'
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else:
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after, partial = _strip_directives(line[m.end():], 2)
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line = f'{before} {after or ""}'
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if partial:
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break
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return line, partial
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def _filter_reqfile(current, reqfile, samefiles):
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if current == reqfile:
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return True
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if current == '<stdin>':
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return True
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if current in samefiles:
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return True
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return False
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def _normpath(filename, cwd):
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assert cwd
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return os.path.normpath(os.path.join(cwd, filename))
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