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440 lines
16 KiB
440 lines
16 KiB
9 months ago
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commit f40c7887d3cc9bb0b56576ed9edbe505ff8058c0
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Thu Sep 22 12:10:41 2022 +0200
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scripts: Extract glibcpp.py from check-obsolete-constructs.py
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The C tokenizer is useful separately.
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Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
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diff --git a/scripts/check-obsolete-constructs.py b/scripts/check-obsolete-constructs.py
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index 89d21dea6e788783..7c7a092e440a3258 100755
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--- a/scripts/check-obsolete-constructs.py
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+++ b/scripts/check-obsolete-constructs.py
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@@ -24,193 +24,14 @@
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"""
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import argparse
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-import collections
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+import os
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import re
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import sys
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-# Simplified lexical analyzer for C preprocessing tokens.
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-# Does not implement trigraphs.
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-# Does not implement backslash-newline in the middle of any lexical
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-# item other than a string literal.
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-# Does not implement universal-character-names in identifiers.
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-# Treats prefixed strings (e.g. L"...") as two tokens (L and "...")
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-# Accepts non-ASCII characters only within comments and strings.
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-
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-# Caution: The order of the outermost alternation matters.
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-# STRING must be before BAD_STRING, CHARCONST before BAD_CHARCONST,
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-# BLOCK_COMMENT before BAD_BLOCK_COM before PUNCTUATOR, and OTHER must
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-# be last.
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-# Caution: There should be no capturing groups other than the named
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-# captures in the outermost alternation.
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-
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-# For reference, these are all of the C punctuators as of C11:
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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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-# : :>
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-# < <% <: << <<= <=
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-# > >= >> >>=
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-
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-# The BAD_* tokens are not part of the official definition of pp-tokens;
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-# they match unclosed strings, character constants, and block comments,
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-# so that the regex engine doesn't have to backtrack all the way to the
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-# beginning of a broken construct and then emit dozens of junk tokens.
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-
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-PP_TOKEN_RE_ = re.compile(r"""
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- (?P<STRING> \"(?:[^\"\\\r\n]|\\(?:[\r\n -~]|\r\n))*\")
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- |(?P<BAD_STRING> \"(?:[^\"\\\r\n]|\\[ -~])*)
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- |(?P<CHARCONST> \'(?:[^\'\\\r\n]|\\(?:[\r\n -~]|\r\n))*\')
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- |(?P<BAD_CHARCONST> \'(?:[^\'\\\r\n]|\\[ -~])*)
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- |(?P<BLOCK_COMMENT> /\*(?:\*(?!/)|[^*])*\*/)
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- |(?P<BAD_BLOCK_COM> /\*(?:\*(?!/)|[^*])*\*?)
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- |(?P<LINE_COMMENT> //[^\r\n]*)
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- |(?P<IDENT> [_a-zA-Z][_a-zA-Z0-9]*)
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- |(?P<PP_NUMBER> \.?[0-9](?:[0-9a-df-oq-zA-DF-OQ-Z_.]|[eEpP][+-]?)*)
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- |(?P<PUNCTUATOR>
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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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- | :>?
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- | <(?:[%:]|<(?:=|<=?)?)?
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- | >(?:=|>=?)?)
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- |(?P<ESCNL> \\(?:\r|\n|\r\n))
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- |(?P<WHITESPACE> [ \t\n\r\v\f]+)
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- |(?P<OTHER> .)
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-""", re.DOTALL | re.VERBOSE)
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-
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-HEADER_NAME_RE_ = re.compile(r"""
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- < [^>\r\n]+ >
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- | " [^"\r\n]+ "
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-""", re.DOTALL | re.VERBOSE)
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-
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-ENDLINE_RE_ = re.compile(r"""\r|\n|\r\n""")
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-
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-# based on the sample code in the Python re documentation
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-Token_ = collections.namedtuple("Token", (
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- "kind", "text", "line", "column", "context"))
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-Token_.__doc__ = """
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- One C preprocessing token, comment, or chunk of whitespace.
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- 'kind' identifies the token type, which will be one of:
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- STRING, CHARCONST, BLOCK_COMMENT, LINE_COMMENT, IDENT,
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- PP_NUMBER, PUNCTUATOR, ESCNL, WHITESPACE, HEADER_NAME,
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- or OTHER. The BAD_* alternatives in PP_TOKEN_RE_ are
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- handled within tokenize_c, below.
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-
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- 'text' is the sequence of source characters making up the token;
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- no decoding whatsoever is performed.
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-
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- 'line' and 'column' give the position of the first character of the
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- token within the source file. They are both 1-based.
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-
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- 'context' indicates whether or not this token occurred within a
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- preprocessing directive; it will be None for running text,
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- '<null>' for the leading '#' of a directive line (because '#'
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- all by itself on a line is a "null directive"), or the name of
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- the directive for tokens within a directive line, starting with
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- the IDENT for the name itself.
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-"""
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-
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-def tokenize_c(file_contents, reporter):
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- """Yield a series of Token objects, one for each preprocessing
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- token, comment, or chunk of whitespace within FILE_CONTENTS.
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- The REPORTER object is expected to have one method,
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- reporter.error(token, message), which will be called to
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- indicate a lexical error at the position of TOKEN.
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- If MESSAGE contains the four-character sequence '{!r}', that
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- is expected to be replaced by repr(token.text).
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- """
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+# Make available glibc Python modules.
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+sys.path.append(os.path.dirname(os.path.realpath(__file__)))
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- Token = Token_
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- PP_TOKEN_RE = PP_TOKEN_RE_
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- ENDLINE_RE = ENDLINE_RE_
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- HEADER_NAME_RE = HEADER_NAME_RE_
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-
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- line_num = 1
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- line_start = 0
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- pos = 0
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- limit = len(file_contents)
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- directive = None
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- at_bol = True
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- while pos < limit:
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- if directive == "include":
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- mo = HEADER_NAME_RE.match(file_contents, pos)
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- if mo:
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- kind = "HEADER_NAME"
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- directive = "after_include"
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- else:
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- mo = PP_TOKEN_RE.match(file_contents, pos)
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- kind = mo.lastgroup
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- if kind != "WHITESPACE":
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- directive = "after_include"
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- else:
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- mo = PP_TOKEN_RE.match(file_contents, pos)
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- kind = mo.lastgroup
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-
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- text = mo.group()
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- line = line_num
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- column = mo.start() - line_start
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- adj_line_start = 0
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- # only these kinds can contain a newline
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- if kind in ("WHITESPACE", "BLOCK_COMMENT", "LINE_COMMENT",
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- "STRING", "CHARCONST", "BAD_BLOCK_COM", "ESCNL"):
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- for tmo in ENDLINE_RE.finditer(text):
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- line_num += 1
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- adj_line_start = tmo.end()
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- if adj_line_start:
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- line_start = mo.start() + adj_line_start
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-
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- # Track whether or not we are scanning a preprocessing directive.
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- if kind == "LINE_COMMENT" or (kind == "WHITESPACE" and adj_line_start):
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- at_bol = True
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- directive = None
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- else:
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- if kind == "PUNCTUATOR" and text == "#" and at_bol:
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- directive = "<null>"
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- elif kind == "IDENT" and directive == "<null>":
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- directive = text
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- at_bol = False
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-
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- # Report ill-formed tokens and rewrite them as their well-formed
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- # equivalents, so downstream processing doesn't have to know about them.
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- # (Rewriting instead of discarding provides better error recovery.)
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- if kind == "BAD_BLOCK_COM":
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- reporter.error(Token("BAD_BLOCK_COM", "", line, column+1, ""),
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- "unclosed block comment")
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- text += "*/"
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- kind = "BLOCK_COMMENT"
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- elif kind == "BAD_STRING":
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- reporter.error(Token("BAD_STRING", "", line, column+1, ""),
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- "unclosed string")
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- text += "\""
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- kind = "STRING"
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- elif kind == "BAD_CHARCONST":
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- reporter.error(Token("BAD_CHARCONST", "", line, column+1, ""),
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- "unclosed char constant")
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- text += "'"
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- kind = "CHARCONST"
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-
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- tok = Token(kind, text, line, column+1,
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- "include" if directive == "after_include" else directive)
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- # Do not complain about OTHER tokens inside macro definitions.
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- # $ and @ appear in macros defined by headers intended to be
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- # included from assembly language, e.g. sysdeps/mips/sys/asm.h.
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- if kind == "OTHER" and directive != "define":
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- self.error(tok, "stray {!r} in program")
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-
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- yield tok
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- pos = mo.end()
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+import glibcpp
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#
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# Base and generic classes for individual checks.
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@@ -446,7 +267,7 @@ class HeaderChecker:
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typedef_checker = ObsoleteTypedefChecker(self, self.fname)
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- for tok in tokenize_c(contents, self):
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+ for tok in glibcpp.tokenize_c(contents, self):
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typedef_checker.examine(tok)
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def main():
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diff --git a/scripts/glibcpp.py b/scripts/glibcpp.py
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new file mode 100644
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index 0000000000000000..b44c6a4392dde8ce
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--- /dev/null
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+++ b/scripts/glibcpp.py
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@@ -0,0 +1,212 @@
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+#! /usr/bin/python3
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+# Approximation to C preprocessing.
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+# Copyright (C) 2019-2022 Free Software Foundation, Inc.
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+# This file is part of the GNU C Library.
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+#
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+# The GNU C Library is free software; you can redistribute it and/or
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+# modify it under the terms of the GNU Lesser General Public
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+# License as published by the Free Software Foundation; either
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+# version 2.1 of the License, or (at your option) any later version.
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+#
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+# The GNU C Library is distributed in the hope that it will be useful,
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+# but WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+# Lesser General Public License for more details.
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+#
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+# You should have received a copy of the GNU Lesser General Public
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+# License along with the GNU C Library; if not, see
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+# <https://www.gnu.org/licenses/>.
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+
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+"""
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+Simplified lexical analyzer for C preprocessing tokens.
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+
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+Does not implement trigraphs.
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+
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+Does not implement backslash-newline in the middle of any lexical
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|
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+item other than a string literal.
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|
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+
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+Does not implement universal-character-names in identifiers.
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|
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+
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+Treats prefixed strings (e.g. L"...") as two tokens (L and "...").
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|
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+
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+Accepts non-ASCII characters only within comments and strings.
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+"""
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+
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+import collections
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+import re
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+
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|
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+# Caution: The order of the outermost alternation matters.
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|
|
+# STRING must be before BAD_STRING, CHARCONST before BAD_CHARCONST,
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|
|
+# BLOCK_COMMENT before BAD_BLOCK_COM before PUNCTUATOR, and OTHER must
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||
|
|
+# be last.
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||
|
|
+# Caution: There should be no capturing groups other than the named
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||
|
|
+# captures in the outermost alternation.
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||
|
|
+
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||
|
|
+# For reference, these are all of the C punctuators as of C11:
|
||
|
|
+# [ ] ( ) { } , ; ? ~
|
||
|
|
+# ! != * *= / /= ^ ^= = ==
|
||
|
|
+# # ##
|
||
|
|
+# % %= %> %: %:%:
|
||
|
|
+# & &= &&
|
||
|
|
+# | |= ||
|
||
|
|
+# + += ++
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|
|
+# - -= -- ->
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||
|
|
+# . ...
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|
|
+# : :>
|
||
|
|
+# < <% <: << <<= <=
|
||
|
|
+# > >= >> >>=
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||
|
|
+
|
||
|
|
+# The BAD_* tokens are not part of the official definition of pp-tokens;
|
||
|
|
+# they match unclosed strings, character constants, and block comments,
|
||
|
|
+# so that the regex engine doesn't have to backtrack all the way to the
|
||
|
|
+# beginning of a broken construct and then emit dozens of junk tokens.
|
||
|
|
+
|
||
|
|
+PP_TOKEN_RE_ = re.compile(r"""
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||
|
|
+ (?P<STRING> \"(?:[^\"\\\r\n]|\\(?:[\r\n -~]|\r\n))*\")
|
||
|
|
+ |(?P<BAD_STRING> \"(?:[^\"\\\r\n]|\\[ -~])*)
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||
|
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+ |(?P<CHARCONST> \'(?:[^\'\\\r\n]|\\(?:[\r\n -~]|\r\n))*\')
|
||
|
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+ |(?P<BAD_CHARCONST> \'(?:[^\'\\\r\n]|\\[ -~])*)
|
||
|
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+ |(?P<BLOCK_COMMENT> /\*(?:\*(?!/)|[^*])*\*/)
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||
|
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+ |(?P<BAD_BLOCK_COM> /\*(?:\*(?!/)|[^*])*\*?)
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||
|
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+ |(?P<LINE_COMMENT> //[^\r\n]*)
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||
|
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+ |(?P<IDENT> [_a-zA-Z][_a-zA-Z0-9]*)
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||
|
|
+ |(?P<PP_NUMBER> \.?[0-9](?:[0-9a-df-oq-zA-DF-OQ-Z_.]|[eEpP][+-]?)*)
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||
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+ |(?P<PUNCTUATOR>
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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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+ | &[=&]?
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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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+ | :>?
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||
|
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+ | <(?:[%:]|<(?:=|<=?)?)?
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||
|
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+ | >(?:=|>=?)?)
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||
|
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+ |(?P<ESCNL> \\(?:\r|\n|\r\n))
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+ |(?P<WHITESPACE> [ \t\n\r\v\f]+)
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||
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+ |(?P<OTHER> .)
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||
|
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+""", re.DOTALL | re.VERBOSE)
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||
|
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+
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+HEADER_NAME_RE_ = re.compile(r"""
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||
|
|
+ < [^>\r\n]+ >
|
||
|
|
+ | " [^"\r\n]+ "
|
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|
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+""", re.DOTALL | re.VERBOSE)
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||
|
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+
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|
+ENDLINE_RE_ = re.compile(r"""\r|\n|\r\n""")
|
||
|
|
+
|
||
|
|
+# based on the sample code in the Python re documentation
|
||
|
|
+Token_ = collections.namedtuple("Token", (
|
||
|
|
+ "kind", "text", "line", "column", "context"))
|
||
|
|
+Token_.__doc__ = """
|
||
|
|
+ One C preprocessing token, comment, or chunk of whitespace.
|
||
|
|
+ 'kind' identifies the token type, which will be one of:
|
||
|
|
+ STRING, CHARCONST, BLOCK_COMMENT, LINE_COMMENT, IDENT,
|
||
|
|
+ PP_NUMBER, PUNCTUATOR, ESCNL, WHITESPACE, HEADER_NAME,
|
||
|
|
+ or OTHER. The BAD_* alternatives in PP_TOKEN_RE_ are
|
||
|
|
+ handled within tokenize_c, below.
|
||
|
|
+
|
||
|
|
+ 'text' is the sequence of source characters making up the token;
|
||
|
|
+ no decoding whatsoever is performed.
|
||
|
|
+
|
||
|
|
+ 'line' and 'column' give the position of the first character of the
|
||
|
|
+ token within the source file. They are both 1-based.
|
||
|
|
+
|
||
|
|
+ 'context' indicates whether or not this token occurred within a
|
||
|
|
+ preprocessing directive; it will be None for running text,
|
||
|
|
+ '<null>' for the leading '#' of a directive line (because '#'
|
||
|
|
+ all by itself on a line is a "null directive"), or the name of
|
||
|
|
+ the directive for tokens within a directive line, starting with
|
||
|
|
+ the IDENT for the name itself.
|
||
|
|
+"""
|
||
|
|
+
|
||
|
|
+def tokenize_c(file_contents, reporter):
|
||
|
|
+ """Yield a series of Token objects, one for each preprocessing
|
||
|
|
+ token, comment, or chunk of whitespace within FILE_CONTENTS.
|
||
|
|
+ The REPORTER object is expected to have one method,
|
||
|
|
+ reporter.error(token, message), which will be called to
|
||
|
|
+ indicate a lexical error at the position of TOKEN.
|
||
|
|
+ If MESSAGE contains the four-character sequence '{!r}', that
|
||
|
|
+ is expected to be replaced by repr(token.text).
|
||
|
|
+ """
|
||
|
|
+
|
||
|
|
+ Token = Token_
|
||
|
|
+ PP_TOKEN_RE = PP_TOKEN_RE_
|
||
|
|
+ ENDLINE_RE = ENDLINE_RE_
|
||
|
|
+ HEADER_NAME_RE = HEADER_NAME_RE_
|
||
|
|
+
|
||
|
|
+ line_num = 1
|
||
|
|
+ line_start = 0
|
||
|
|
+ pos = 0
|
||
|
|
+ limit = len(file_contents)
|
||
|
|
+ directive = None
|
||
|
|
+ at_bol = True
|
||
|
|
+ while pos < limit:
|
||
|
|
+ if directive == "include":
|
||
|
|
+ mo = HEADER_NAME_RE.match(file_contents, pos)
|
||
|
|
+ if mo:
|
||
|
|
+ kind = "HEADER_NAME"
|
||
|
|
+ directive = "after_include"
|
||
|
|
+ else:
|
||
|
|
+ mo = PP_TOKEN_RE.match(file_contents, pos)
|
||
|
|
+ kind = mo.lastgroup
|
||
|
|
+ if kind != "WHITESPACE":
|
||
|
|
+ directive = "after_include"
|
||
|
|
+ else:
|
||
|
|
+ mo = PP_TOKEN_RE.match(file_contents, pos)
|
||
|
|
+ kind = mo.lastgroup
|
||
|
|
+
|
||
|
|
+ text = mo.group()
|
||
|
|
+ line = line_num
|
||
|
|
+ column = mo.start() - line_start
|
||
|
|
+ adj_line_start = 0
|
||
|
|
+ # only these kinds can contain a newline
|
||
|
|
+ if kind in ("WHITESPACE", "BLOCK_COMMENT", "LINE_COMMENT",
|
||
|
|
+ "STRING", "CHARCONST", "BAD_BLOCK_COM", "ESCNL"):
|
||
|
|
+ for tmo in ENDLINE_RE.finditer(text):
|
||
|
|
+ line_num += 1
|
||
|
|
+ adj_line_start = tmo.end()
|
||
|
|
+ if adj_line_start:
|
||
|
|
+ line_start = mo.start() + adj_line_start
|
||
|
|
+
|
||
|
|
+ # Track whether or not we are scanning a preprocessing directive.
|
||
|
|
+ if kind == "LINE_COMMENT" or (kind == "WHITESPACE" and adj_line_start):
|
||
|
|
+ at_bol = True
|
||
|
|
+ directive = None
|
||
|
|
+ else:
|
||
|
|
+ if kind == "PUNCTUATOR" and text == "#" and at_bol:
|
||
|
|
+ directive = "<null>"
|
||
|
|
+ elif kind == "IDENT" and directive == "<null>":
|
||
|
|
+ directive = text
|
||
|
|
+ at_bol = False
|
||
|
|
+
|
||
|
|
+ # Report ill-formed tokens and rewrite them as their well-formed
|
||
|
|
+ # equivalents, so downstream processing doesn't have to know about them.
|
||
|
|
+ # (Rewriting instead of discarding provides better error recovery.)
|
||
|
|
+ if kind == "BAD_BLOCK_COM":
|
||
|
|
+ reporter.error(Token("BAD_BLOCK_COM", "", line, column+1, ""),
|
||
|
|
+ "unclosed block comment")
|
||
|
|
+ text += "*/"
|
||
|
|
+ kind = "BLOCK_COMMENT"
|
||
|
|
+ elif kind == "BAD_STRING":
|
||
|
|
+ reporter.error(Token("BAD_STRING", "", line, column+1, ""),
|
||
|
|
+ "unclosed string")
|
||
|
|
+ text += "\""
|
||
|
|
+ kind = "STRING"
|
||
|
|
+ elif kind == "BAD_CHARCONST":
|
||
|
|
+ reporter.error(Token("BAD_CHARCONST", "", line, column+1, ""),
|
||
|
|
+ "unclosed char constant")
|
||
|
|
+ text += "'"
|
||
|
|
+ kind = "CHARCONST"
|
||
|
|
+
|
||
|
|
+ tok = Token(kind, text, line, column+1,
|
||
|
|
+ "include" if directive == "after_include" else directive)
|
||
|
|
+ # Do not complain about OTHER tokens inside macro definitions.
|
||
|
|
+ # $ and @ appear in macros defined by headers intended to be
|
||
|
|
+ # included from assembly language, e.g. sysdeps/mips/sys/asm.h.
|
||
|
|
+ if kind == "OTHER" and directive != "define":
|
||
|
|
+ self.error(tok, "stray {!r} in program")
|
||
|
|
+
|
||
|
|
+ yield tok
|
||
|
|
+ pos = mo.end()
|