cppcheck/tools/matchcompiler.py

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#!/usr/bin/python
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#
# Cppcheck - A tool for static C/C++ code analysis
# Copyright (C) 2007-2013 Daniel Marjamaeki and Cppcheck team.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
import sys
import re
import glob
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import argparse
class MatchCompiler:
def __init__(self, verify_mode=False):
self._verifyMode = verify_mode
self._reset()
def _reset(self):
self._rawMatchFunctions = []
self._matchStrs = {}
self._matchFunctionCache = {}
def _generateCacheSignature(self, pattern, endToken=None, varId=None, isFindMatch=False):
sig = pattern
if endToken:
sig += '|ENDTOKEN'
else:
sig += '|NO-ENDTOKEN'
if varId:
sig += '|VARID'
else:
sig += '|NO-VARID'
if isFindMatch:
sig += '|ISFINDMATCH'
else:
sig += '|NORMALMATCH'
return sig
def _lookupMatchFunctionId(self, pattern, endToken=None, varId=None, isFindMatch=False):
signature = self._generateCacheSignature(pattern, endToken, varId, isFindMatch)
if signature in self._matchFunctionCache:
return self._matchFunctionCache[signature]
return None
def _insertMatchFunctionId(self, id, pattern, endToken=None, varId=None, isFindMatch=False):
signature = self._generateCacheSignature(pattern, endToken, varId, isFindMatch)
# function signature should not be in the cache
assert(self._lookupMatchFunctionId(pattern, endToken, varId, isFindMatch) == None)
self._matchFunctionCache[signature] = id
def _insertMatchStr(self, look_for):
prefix = 'matchStr'
# Add entry if needed
if look_for not in self._matchStrs:
pos = len(self._matchStrs) + 1
self._matchStrs[look_for] = pos
return prefix + str(self._matchStrs[look_for])
def _compileCmd(self, tok):
if tok == '%any%':
return 'true'
elif tok == '%bool%':
return 'tok->isBoolean()'
elif tok == '%char%':
return '(tok->type()==Token::eChar)'
elif tok == '%comp%':
return 'tok->isComparisonOp()'
elif tok == '%num%':
return 'tok->isNumber()'
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elif tok == '%cop%':
return 'tok->isConstOp()'
elif tok == '%op%':
return 'tok->isOp()'
elif tok == '%or%':
return '(tok->str()==' + self._insertMatchStr('|') + ')/* | */'
elif tok == '%oror%':
return '(tok->str()==' + self._insertMatchStr('||') + ')/* || */'
elif tok == '%str%':
return '(tok->type()==Token::eString)'
elif tok == '%type%':
return '(tok->isName() && tok->varId()==0U && tok->str() != ' + self._insertMatchStr('delete') + '/* delete */)'
elif tok == '%var%':
return 'tok->isName()'
elif tok == '%varid%':
return '(tok->isName() && tok->varId()==varid)'
elif (len(tok)>2) and (tok[0]=="%"):
print ("unhandled:" + tok)
return '(tok->str()==' + self._insertMatchStr(tok) + ')/* ' + tok + ' */'
def _compilePattern(self, pattern, nr, varid, isFindMatch=False):
ret = ''
returnStatement = ''
if isFindMatch:
ret = '\nconst Token *tok = start_tok;\n'
returnStatement = 'continue;\n'
else:
arg2 = ''
if varid:
arg2 = ', const unsigned int varid'
ret = '// pattern: ' + pattern + '\n'
ret += 'static bool match' + str(nr) + '(const Token *tok'+arg2+') {\n'
returnStatement = 'return false;\n'
tokens = pattern.split(' ')
gotoNextToken = ''
checked_varid = False
for tok in tokens:
if tok == '':
continue
ret += gotoNextToken
gotoNextToken = ' tok = tok->next();\n'
# if varid is provided, check that it's non-zero on first use
if varid and tok.find('%varid%') != -1 and checked_varid == False:
ret += ' if (varid==0U)\n'
ret += ' throw InternalError(tok, "Internal error. Token::Match called with varid 0. Please report this to Cppcheck developers");\n'
checked_varid = True
# [abc]
if (len(tok) > 2) and (tok[0] == '[') and (tok[-1] == ']'):
ret += ' if (!tok || tok->str().size()!=1U || !strchr("'+tok[1:-1]+'", tok->str()[0]))\n'
ret += ' ' + returnStatement
# a|b|c
elif tok.find('|') > 0:
tokens2 = tok.split('|')
logicalOp = None
neg = None
if "" in tokens2:
ret += ' if (tok && ('
logicalOp = ' || '
neg = ''
else:
ret += ' if (!tok || !('
logicalOp = ' || '
neg = ''
first = True
for tok2 in tokens2:
if tok2 == '':
continue
if not first:
ret += logicalOp
first = False
ret += neg + self._compileCmd(tok2)
if "" in tokens2:
ret += '))\n'
ret += ' tok = tok->next();\n'
gotoNextToken = ''
else:
ret += '))\n'
ret += ' ' + returnStatement
# !!a
elif tok[0:2] == "!!":
ret += ' if (tok && tok->str() == ' + self._insertMatchStr(tok[2:]) + ')/* ' + tok[2:] + ' */\n'
ret += ' ' + returnStatement
gotoNextToken = ' tok = tok ? tok->next() : NULL;\n'
else:
ret += ' if (!tok || !' + self._compileCmd(tok) + ')\n'
ret += ' ' + returnStatement
if isFindMatch:
ret += ' return start_tok;\n'
else:
ret += ' return true;\n'
ret += '}\n'
return ret
def _compileFindPattern(self, pattern, findmatchnr, endToken, varId):
more_args = ''
endCondition = ''
if endToken:
more_args += ', const Token *end'
endCondition = ' && start_tok != end'
if varId:
more_args += ', unsigned int varid'
ret = '// pattern: ' + pattern + '\n'
ret += 'static const Token *findmatch' + str(findmatchnr) + '(const Token *start_tok'+more_args+') {\n'
ret += ' for (; start_tok' + endCondition + '; start_tok = start_tok->next()) {\n'
ret += self._compilePattern(pattern, -1, varId, True)
ret += ' }\n'
ret += ' return NULL;\n}\n'
return ret
def parseMatch(self, line, pos1):
parlevel = 0
args = []
argstart = 0
pos = pos1
inString = False
while pos < len(line):
if inString:
if line[pos] == '\\':
pos += 1
elif line[pos] == '"':
inString = False
elif line[pos] == '"':
inString = True
elif line[pos] == '(':
parlevel += 1
if parlevel == 1:
argstart = pos + 1
elif line[pos] == ')':
parlevel -= 1
if parlevel == 0:
ret = []
ret.append(line[pos1:pos+1])
for arg in args:
ret.append(arg)
ret.append(line[argstart:pos])
return ret
elif line[pos] == ',' and parlevel == 1:
args.append(line[argstart:pos])
argstart = pos + 1
pos += 1
return None
def _parseStringComparison(self, line, pos1):
startPos = 0
endPos = 0
pos = pos1
inString = False
while pos < len(line):
if inString:
if line[pos] == '\\':
pos += 1
elif line[pos] == '"':
inString = False
endPos = pos+1
return (startPos, endPos)
elif line[pos] == '"':
startPos = pos
inString = True
pos += 1
return None
def _compileVerifyTokenMatch(self, is_simplematch, verifyNumber, pattern, patternNumber, varId):
more_args = ''
if varId:
more_args = ', const unsigned int varid'
ret = 'static bool match_verify' + str(verifyNumber) + '(const Token *tok'+more_args+') {\n'
origMatchName = 'Match'
if is_simplematch:
origMatchName = 'simpleMatch'
assert(varId == None)
ret += ' bool res_compiled_match = match'+str(patternNumber)+'(tok'
if varId:
ret += ', varid'
ret += ');\n'
ret += ' bool res_parsed_match = Token::' + origMatchName + '(tok, "' + pattern + '"'
if varId:
ret += ', varid'
ret += ');\n'
ret += '\n'
# Don't use assert() here, it's disabled for optimized builds.
# We also need to verify builds in 'release' mode
ret += ' if (res_parsed_match != res_compiled_match) {\n'
# ret += ' std::cout << "res_parsed_match' + str(verifyNumber) + ': " << res_parsed_match << ", res_compiled_match: " << res_compiled_match << "\\n";\n'
# ret += ' if (tok)\n'
# ret += ' std::cout << "tok: " << tok->str();\n'
# ret += ' if (tok->next())\n'
# ret += ' std::cout << "tok next: " << tok->next()->str();\n'
ret += ' throw InternalError(tok, "Internal error. compiled match returned different result than parsed match");\n'
ret += ' }\n'
ret += ' return res_compiled_match;\n'
ret += '}\n'
return ret
def _replaceSpecificTokenMatch(self, is_simplematch, line, start_pos, end_pos, pattern, tok, varId):
more_args = ''
if varId:
more_args = ',' + varId
# Compile function or use previously compiled one
patternNumber = self._lookupMatchFunctionId(pattern, None, varId, False)
if patternNumber == None:
patternNumber = len(self._rawMatchFunctions) + 1
self._insertMatchFunctionId(patternNumber, pattern, None, varId, False)
self._rawMatchFunctions.append(self._compilePattern(pattern, patternNumber, varId))
functionName = "match"
if self._verifyMode:
verifyNumber = len(self._rawMatchFunctions) + 1
self._rawMatchFunctions.append(self._compileVerifyTokenMatch(is_simplematch, verifyNumber, pattern, patternNumber, varId))
# inject verify function
functionName = "match_verify"
patternNumber = verifyNumber
return line[:start_pos]+functionName+str(patternNumber)+'('+tok+more_args+')'+line[start_pos+end_pos:]
def _replaceTokenMatch(self, line):
while True:
is_simplematch = False
pos1 = line.find('Token::Match(')
if pos1 == -1:
is_simplematch = True
pos1 = line.find('Token::simpleMatch(')
if pos1 == -1:
break
res = self.parseMatch(line, pos1)
if res == None:
break
assert(len(res)==3 or len(res)==4) # assert that Token::Match has either 2 or 3 arguments
end_pos = len(res[0])
tok = res[1]
raw_pattern = res[2]
varId = None
if len(res) == 4:
varId = res[3]
res = re.match(r'\s*"([^"]*)"\s*$', raw_pattern)
if res == None:
break # Non-const pattern - bailout
pattern = res.group(1)
line = self._replaceSpecificTokenMatch(is_simplematch, line, pos1, end_pos, pattern, tok, varId)
return line
def _compileVerifyTokenFindMatch(self, is_findsimplematch, verifyNumber, pattern, patternNumber, endToken, varId):
more_args = ''
if endToken:
more_args += ', const Token *endToken'
if varId:
more_args += ', const unsigned int varid'
ret = 'static const Token *findmatch_verify' + str(verifyNumber) + '(const Token *tok'+more_args+') {\n'
origFindMatchName = 'findmatch'
if is_findsimplematch:
origMatchName = 'findsimplematch'
assert(varId == None)
ret += ' const Token *res_compiled_findmatch = findmatch'+str(patternNumber)+'(tok'
if endToken:
ret += ', endToken'
if varId:
ret += ', varid'
ret += ');\n'
ret += ' const Token *res_parsed_findmatch = Token::' + origFindMatchName + '(tok, "' + pattern + '"'
if endToken:
ret += ', endToken'
if varId:
ret += ', varid'
ret += ');\n'
ret += '\n'
# Don't use assert() here, it's disabled for optimized builds.
# We also need to verify builds in 'release' mode
ret += ' if (res_parsed_findmatch != res_compiled_findmatch) {\n'
ret += ' throw InternalError(tok, "Internal error. compiled findmatch returned different result than parsed findmatch");\n'
ret += ' }\n'
ret += ' return res_compiled_findmatch;\n'
ret += '}\n'
return ret
def _replaceSpecificFindTokenMatch(self, is_findsimplematch, line, start_pos, end_pos, pattern, tok, endToken, varId):
more_args = ''
if endToken:
more_args += ',' + endToken
if varId:
more_args += ',' + varId
# Compile function or use previously compiled one
findMatchNumber = self._lookupMatchFunctionId(pattern, endToken, varId, True)
if findMatchNumber == None:
findMatchNumber = len(self._rawMatchFunctions) + 1
self._insertMatchFunctionId(findMatchNumber, pattern, endToken, varId, True)
self._rawMatchFunctions.append(self._compileFindPattern(pattern, findMatchNumber, endToken, varId))
functionName = "findmatch"
if self._verifyMode:
verifyNumber = len(self._rawMatchFunctions) + 1
self._rawMatchFunctions.append(self._compileVerifyTokenFindMatch(is_findsimplematch, verifyNumber, pattern, findMatchNumber, endToken, varId))
# inject verify function
functionName = "findmatch_verify"
findMatchNumber = verifyNumber
return line[:start_pos]+functionName+str(findMatchNumber)+'('+tok+more_args+')'+line[start_pos+end_pos:]
def _replaceTokenFindMatch(self, line):
pos1 = 0
while True:
is_findsimplematch = True
pos1 = line.find('Token::findsimplematch(')
if pos1 == -1:
is_findsimplematch = False
pos1 = line.find('Token::findmatch(')
if pos1 == -1:
break
res = self.parseMatch(line, pos1)
if res == None:
break
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assert(len(res)>=3 or len(res) < 6) # assert that Token::find(simple)match has either 2, 3 or four arguments
g0 = res[0]
tok = res[1]
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pattern = res[2]
# Check for varId
varId = None
if not is_findsimplematch and g0.find("%varid%") != -1:
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if len(res) == 5:
varId = res[4]
else:
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varId = res[3]
# endToken support. We resolve the overloaded type by checking if varId is used or not.
# Function protoypes:
# Token *findsimplematch(const Token *tok, const char pattern[]);
# Token *findsimplematch(const Token *tok, const char pattern[], const Token *end);
# Token *findmatch(const Token *tok, const char pattern[], unsigned int varId = 0);
# Token *findmatch(const Token *tok, const char pattern[], const Token *end, unsigned int varId = 0);
endToken = None
if is_findsimplematch == True and len(res) == 4:
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endToken = res[3]
elif is_findsimplematch == False:
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if varId and len(res) == 5:
endToken = res[3]
elif varId == None and len(res) == 4:
endToken = res[3]
res = re.match(r'\s*"([^"]*)"\s*$', pattern)
if res == None:
break # Non-const pattern - bailout
pattern = res.group(1)
line = self._replaceSpecificFindTokenMatch(is_findsimplematch, line, pos1, len(g0), pattern, tok, endToken, varId)
return line
def _replaceCStrings(self, line):
while True:
match = re.search('str\(\) (==|!=) "', line)
if not match:
match = re.search('strAt\(.+?\) (==|!=) "', line)
if not match:
break
res = self._parseStringComparison(line, match.start())
if res == None:
break
startPos = res[0]
endPos = res[1]
text = line[startPos+1:endPos-1]
line = line[:startPos] + self._insertMatchStr(text) + line[endPos:]
return line
def convertFile(self, srcname, destname):
self._reset()
fin = open(srcname, "rt")
srclines = fin.readlines()
fin.close()
header = '#include "token.h"\n'
header += '#include "errorlogger.h"\n'
header += '#include <string>\n'
header += '#include <cstring>\n'
# header += '#include <iostream>\n'
code = ''
for line in srclines:
# Compile Token::Match and Token::simpleMatch
line = self._replaceTokenMatch(line)
# Compile Token::findsimplematch
line = self._replaceTokenFindMatch(line)
# Cache plain C-strings in C++ strings
line = self._replaceCStrings(line)
code += line
# Compute string list
stringList = ''
for match in sorted(self._matchStrs, key=self._matchStrs.get):
stringList += 'static const std::string matchStr' + str(self._matchStrs[match]) + '("' + match + '");\n'
# Compute matchFunctions
strFunctions = ''
for function in self._rawMatchFunctions:
strFunctions += function
fout = open(destname, 'wt')
fout.write(header+stringList+strFunctions+code)
fout.close()
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def main():
# Main program
build_dir = 'build'
# Check if we are invoked from the right place
if not os.path.exists('lib') and not os.path.exists('samples'):
print('Please invoke from the top level cppcheck source dir. Example: tools/matchcompiler.py')
sys.exit(-1)
# Create build directory if needed
if not os.path.exists(build_dir):
os.makedirs(build_dir)
if not os.path.isdir(build_dir):
raise Exception(build_dir + ' is not a directory')
# Argument handling
parser = argparse.ArgumentParser(description='Compile Token::Match() calls into native C++ code')
parser.add_argument('--verify', action='store_true', default=False,
help='verify compiled matches against on-the-fly parser. Slow!')
args = parser.parse_args()
mc = MatchCompiler(verify_mode=args.verify)
# convert all lib/*.cpp files
for f in glob.glob('lib/*.cpp'):
print (f + ' => ' + build_dir + '/' + f[4:])
mc.convertFile(f, build_dir + '/'+f[4:])
if __name__ == '__main__':
main()