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preprocessor optimization, unnecessary map creation removed 

it used to be O(n^2), now it's only O(n)
This commit is contained in:
flashm 2013-09-04 22:19:31 +12:00 committed by Daniel Marjamäki
parent 9be2f6b5d4
commit f56a85358b
1 changed files with 14 additions and 19 deletions
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33
lib/preprocessor.cpp
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@ -1186,6 +1186,7 @@ std::list<std::string> Preprocessor::getcfgs(const std::string &filedata, const
// constants defined through "#define" in the code..
std::set<std::string> defines;
std::map<std::string, std::string> alldefinesmap(defs);
// How deep into included files are we currently parsing?
// 0=>Source file, 1=>Included by source file, 2=>included by header that was included by source file, etc
@ -1238,12 +1239,19 @@ std::list<std::string> Preprocessor::getcfgs(const std::string &filedata, const
}
if (!valid)
line.clear();
else if (line.find(" ", 8) == std::string::npos)
defines.insert(line.substr(8));
else {
std::string s = line.substr(8);
s[s.find(" ")] = '=';
defines.insert(s);
std::string definestr = line.substr(8);
const std::string::size_type spacepos = definestr.find(" ");
if (spacepos != std::string::npos)
definestr[spacepos] = '=';
defines.insert(definestr);
const std::string::size_type separatorpos = definestr.find_first_of("=(");
if (separatorpos != std::string::npos && definestr[separatorpos] == '=') {
const std::string varname(definestr.substr(0, separatorpos));
const std::string value(definestr.substr(separatorpos + 1));
alldefinesmap[varname] = value;
}
}
}
@ -1298,20 +1306,7 @@ std::list<std::string> Preprocessor::getcfgs(const std::string &filedata, const
}
// Replace defined constants
{
std::map<std::string, std::string> varmap(defs);
for (std::set<std::string>::const_iterator it = defines.begin(); it != defines.end(); ++it) {
std::string::size_type pos = it->find_first_of("=(");
if (pos == std::string::npos)
continue;
if ((*it)[pos] == '(')
continue;
const std::string varname(it->substr(0, pos));
const std::string value(it->substr(pos + 1));
varmap[varname] = value;
}
simplifyCondition(varmap, def, false);
}
simplifyCondition(alldefinesmap, def, false);
if (! deflist.empty() && line.compare(0, 6, "#elif ") == 0)
deflist.pop_back();