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124 lines
3.1 KiB
Python
124 lines
3.1 KiB
Python
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import os.path
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import re
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from . import common as _common
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TOOL = 'gcc'
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# https://gcc.gnu.org/onlinedocs/cpp/Preprocessor-Output.html
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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, incldirs=None, macros=None, samefiles=None):
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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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macros=macros,
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#preargs=PRE_ARGS,
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postargs=POST_ARGS,
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executable=['gcc'],
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compiler='unix',
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)
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return _iter_lines(text, filename, samefiles)
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def _iter_lines(text, filename, samefiles, *, raw=False):
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lines = iter(text.splitlines())
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# Build the lines and filter out directives.
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partial = 0 # depth
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origfile = None
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for line in lines:
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m = LINE_MARKER_RE.match(line)
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if m:
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lno, origfile = m.groups()
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lno = int(lno)
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elif _filter_orig_file(origfile, filename, samefiles):
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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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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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_common.FileInfo(filename, 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 _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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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_orig_file(origfile, current, samefiles):
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if origfile == current:
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return True
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if origfile == '<stdin>':
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return True
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if os.path.isabs(origfile):
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return False
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for filename in samefiles or ():
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if filename.endswith(os.path.sep):
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filename += os.path.basename(current)
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if origfile == filename:
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return True
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return False
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