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llvm-mirror/lib/Support/CommandLine.cpp
Chris Lattner c8276aeb22 Minor code cleanups 
llvm-svn: 29917
2006-08-27 22:10:29 +00:00

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//===-- CommandLine.cpp - Command line parser implementation --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This class implements a command line argument processor that is useful when
// creating a tool. It provides a simple, minimalistic interface that is easily
// extensible and supports nonlocal (library) command line options.
//
// Note that rather than trying to figure out what this code does, you could try
// reading the library documentation located in docs/CommandLine.html
//
//===----------------------------------------------------------------------===//
#include "llvm/Config/config.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/System/Path.h"
#include <algorithm>
#include <functional>
#include <map>
#include <set>
#include <iostream>
#include <cstdlib>
#include <cerrno>
#include <cstring>
using namespace llvm;
using namespace cl;
//===----------------------------------------------------------------------===//
// Template instantiations and anchors.
//
TEMPLATE_INSTANTIATION(class basic_parser<bool>);
TEMPLATE_INSTANTIATION(class basic_parser<int>);
TEMPLATE_INSTANTIATION(class basic_parser<unsigned>);
TEMPLATE_INSTANTIATION(class basic_parser<double>);
TEMPLATE_INSTANTIATION(class basic_parser<float>);
TEMPLATE_INSTANTIATION(class basic_parser<std::string>);
TEMPLATE_INSTANTIATION(class opt<unsigned>);
TEMPLATE_INSTANTIATION(class opt<int>);
TEMPLATE_INSTANTIATION(class opt<std::string>);
TEMPLATE_INSTANTIATION(class opt<bool>);
void Option::anchor() {}
void basic_parser_impl::anchor() {}
void parser<bool>::anchor() {}
void parser<int>::anchor() {}
void parser<unsigned>::anchor() {}
void parser<double>::anchor() {}
void parser<float>::anchor() {}
void parser<std::string>::anchor() {}
//===----------------------------------------------------------------------===//
// Globals for name and overview of program
static std::string ProgramName = "<premain>";
static const char *ProgramOverview = 0;
// This collects additional help to be printed.
static std::vector<const char*> &MoreHelp() {
static std::vector<const char*> moreHelp;
return moreHelp;
}
extrahelp::extrahelp(const char* Help)
: morehelp(Help) {
MoreHelp().push_back(Help);
}
//===----------------------------------------------------------------------===//
// Basic, shared command line option processing machinery.
//
// Return the global command line option vector. Making it a function scoped
// static ensures that it will be initialized correctly before its first use.
//
static std::map<std::string, Option*> &getOpts() {
static std::map<std::string, Option*> CommandLineOptions;
return CommandLineOptions;
}
static Option *getOption(const std::string &Str) {
std::map<std::string,Option*>::iterator I = getOpts().find(Str);
return I != getOpts().end() ? I->second : 0;
}
static std::vector<Option*> &getPositionalOpts() {
static std::vector<Option*> Positional;
return Positional;
}
static void AddArgument(const char *ArgName, Option *Opt) {
if (getOption(ArgName)) {
std::cerr << ProgramName << ": CommandLine Error: Argument '"
<< ArgName << "' defined more than once!\n";
} else {
// Add argument to the argument map!
getOpts()[ArgName] = Opt;
}
}
// RemoveArgument - It's possible that the argument is no longer in the map if
// options have already been processed and the map has been deleted!
//
static void RemoveArgument(const char *ArgName, Option *Opt) {
if(getOpts().empty()) return;
#ifndef NDEBUG
// This disgusting HACK is brought to you courtesy of GCC 3.3.2, which ICE's
// If we pass ArgName directly into getOption here.
std::string Tmp = ArgName;
assert(getOption(Tmp) == Opt && "Arg not in map!");
#endif
getOpts().erase(ArgName);
}
static inline bool ProvideOption(Option *Handler, const char *ArgName,
const char *Value, int argc, char **argv,
int &i) {
// Enforce value requirements
switch (Handler->getValueExpectedFlag()) {
case ValueRequired:
if (Value == 0) { // No value specified?
if (i+1 < argc) { // Steal the next argument, like for '-o filename'
Value = argv[++i];
} else {
return Handler->error(" requires a value!");
}
}
break;
case ValueDisallowed:
if (Value)
return Handler->error(" does not allow a value! '" +
std::string(Value) + "' specified.");
break;
case ValueOptional:
break;
default:
std::cerr << ProgramName
<< ": Bad ValueMask flag! CommandLine usage error:"
<< Handler->getValueExpectedFlag() << "\n";
abort();
break;
}
// Run the handler now!
return Handler->addOccurrence(i, ArgName, Value ? Value : "");
}
static bool ProvidePositionalOption(Option *Handler, const std::string &Arg,
int i) {
int Dummy = i;
return ProvideOption(Handler, Handler->ArgStr, Arg.c_str(), 0, 0, Dummy);
}
// Option predicates...
static inline bool isGrouping(const Option *O) {
return O->getFormattingFlag() == cl::Grouping;
}
static inline bool isPrefixedOrGrouping(const Option *O) {
return isGrouping(O) || O->getFormattingFlag() == cl::Prefix;
}
// getOptionPred - Check to see if there are any options that satisfy the
// specified predicate with names that are the prefixes in Name. This is
// checked by progressively stripping characters off of the name, checking to
// see if there options that satisfy the predicate. If we find one, return it,
// otherwise return null.
//
static Option *getOptionPred(std::string Name, unsigned &Length,
bool (*Pred)(const Option*)) {
Option *Op = getOption(Name);
if (Op && Pred(Op)) {
Length = Name.length();
return Op;
}
if (Name.size() == 1) return 0;
do {
Name.erase(Name.end()-1, Name.end()); // Chop off the last character...
Op = getOption(Name);
// Loop while we haven't found an option and Name still has at least two
// characters in it (so that the next iteration will not be the empty
// string...
} while ((Op == 0 || !Pred(Op)) && Name.size() > 1);
if (Op && Pred(Op)) {
Length = Name.length();
return Op; // Found one!
}
return 0; // No option found!
}
static bool RequiresValue(const Option *O) {
return O->getNumOccurrencesFlag() == cl::Required ||
O->getNumOccurrencesFlag() == cl::OneOrMore;
}
static bool EatsUnboundedNumberOfValues(const Option *O) {
return O->getNumOccurrencesFlag() == cl::ZeroOrMore ||
O->getNumOccurrencesFlag() == cl::OneOrMore;
}
/// ParseCStringVector - Break INPUT up wherever one or more
/// whitespace characters are found, and store the resulting tokens in
/// OUTPUT. The tokens stored in OUTPUT are dynamically allocated
/// using strdup (), so it is the caller's responsibility to free ()
/// them later.
///
static void ParseCStringVector(std::vector<char *> &output,
const char *input) {
// Characters which will be treated as token separators:
static const char *delims = " \v\f\t\r\n";
std::string work (input);
// Skip past any delims at head of input string.
size_t pos = work.find_first_not_of (delims);
// If the string consists entirely of delims, then exit early.
if (pos == std::string::npos) return;
// Otherwise, jump forward to beginning of first word.
work = work.substr (pos);
// Find position of first delimiter.
pos = work.find_first_of (delims);
while (!work.empty() && pos != std::string::npos) {
// Everything from 0 to POS is the next word to copy.
output.push_back (strdup (work.substr (0,pos).c_str ()));
// Is there another word in the string?
size_t nextpos = work.find_first_not_of (delims, pos + 1);
if (nextpos != std::string::npos) {
// Yes? Then remove delims from beginning ...
work = work.substr (work.find_first_not_of (delims, pos + 1));
// and find the end of the word.
pos = work.find_first_of (delims);
} else {
// No? (Remainder of string is delims.) End the loop.
work = "";
pos = std::string::npos;
}
}
// If `input' ended with non-delim char, then we'll get here with
// the last word of `input' in `work'; copy it now.
if (!work.empty ()) {
output.push_back (strdup (work.c_str ()));
}
}
/// ParseEnvironmentOptions - An alternative entry point to the
/// CommandLine library, which allows you to read the program's name
/// from the caller (as PROGNAME) and its command-line arguments from
/// an environment variable (whose name is given in ENVVAR).
///
void cl::ParseEnvironmentOptions(const char *progName, const char *envVar,
const char *Overview) {
// Check args.
assert(progName && "Program name not specified");
assert(envVar && "Environment variable name missing");
// Get the environment variable they want us to parse options out of.
const char *envValue = getenv(envVar);
if (!envValue)
return;
// Get program's "name", which we wouldn't know without the caller
// telling us.
std::vector<char*> newArgv;
newArgv.push_back(strdup(progName));
// Parse the value of the environment variable into a "command line"
// and hand it off to ParseCommandLineOptions().
ParseCStringVector(newArgv, envValue);
int newArgc = newArgv.size();
ParseCommandLineOptions(newArgc, &newArgv[0], Overview);
// Free all the strdup()ed strings.
for (std::vector<char*>::iterator i = newArgv.begin(), e = newArgv.end();
i != e; ++i)
free (*i);
}
/// LookupOption - Lookup the option specified by the specified option on the
/// command line. If there is a value specified (after an equal sign) return
/// that as well.
static Option *LookupOption(const char *&Arg, const char *&Value) {
while (*Arg == '-') ++Arg; // Eat leading dashes
const char *ArgEnd = Arg;
while (*ArgEnd && *ArgEnd != '=')
++ArgEnd; // Scan till end of argument name.
if (*ArgEnd == '=') // If we have an equals sign...
Value = ArgEnd+1; // Get the value, not the equals
if (*Arg == 0) return 0;
// Look up the option.
std::map<std::string, Option*> &Opts = getOpts();
std::map<std::string, Option*>::iterator I =
Opts.find(std::string(Arg, ArgEnd));
return (I != Opts.end()) ? I->second : 0;
}
void cl::ParseCommandLineOptions(int &argc, char **argv,
const char *Overview) {
assert((!getOpts().empty() || !getPositionalOpts().empty()) &&
"No options specified, or ParseCommandLineOptions called more"
" than once!");
sys::Path progname(argv[0]);
ProgramName = sys::Path(argv[0]).getLast();
ProgramOverview = Overview;
bool ErrorParsing = false;
std::map<std::string, Option*> &Opts = getOpts();
std::vector<Option*> &PositionalOpts = getPositionalOpts();
// Check out the positional arguments to collect information about them.
unsigned NumPositionalRequired = 0;
// Determine whether or not there are an unlimited number of positionals
bool HasUnlimitedPositionals = false;
Option *ConsumeAfterOpt = 0;
if (!PositionalOpts.empty()) {
if (PositionalOpts[0]->getNumOccurrencesFlag() == cl::ConsumeAfter) {
assert(PositionalOpts.size() > 1 &&
"Cannot specify cl::ConsumeAfter without a positional argument!");
ConsumeAfterOpt = PositionalOpts[0];
}
// Calculate how many positional values are _required_.
bool UnboundedFound = false;
for (unsigned i = ConsumeAfterOpt != 0, e = PositionalOpts.size();
i != e; ++i) {
Option *Opt = PositionalOpts[i];
if (RequiresValue(Opt))
++NumPositionalRequired;
else if (ConsumeAfterOpt) {
// ConsumeAfter cannot be combined with "optional" positional options
// unless there is only one positional argument...
if (PositionalOpts.size() > 2)
ErrorParsing |=
Opt->error(" error - this positional option will never be matched, "
"because it does not Require a value, and a "
"cl::ConsumeAfter option is active!");
} else if (UnboundedFound && !Opt->ArgStr[0]) {
// This option does not "require" a value... Make sure this option is
// not specified after an option that eats all extra arguments, or this
// one will never get any!
//
ErrorParsing |= Opt->error(" error - option can never match, because "
"another positional argument will match an "
"unbounded number of values, and this option"
" does not require a value!");
}
UnboundedFound |= EatsUnboundedNumberOfValues(Opt);
}
HasUnlimitedPositionals = UnboundedFound || ConsumeAfterOpt;
}
// PositionalVals - A vector of "positional" arguments we accumulate into
// the process at the end...
//
std::vector<std::pair<std::string,unsigned> > PositionalVals;
// If the program has named positional arguments, and the name has been run
// across, keep track of which positional argument was named. Otherwise put
// the positional args into the PositionalVals list...
Option *ActivePositionalArg = 0;
// Loop over all of the arguments... processing them.
bool DashDashFound = false; // Have we read '--'?
for (int i = 1; i < argc; ++i) {
Option *Handler = 0;
const char *Value = 0;
const char *ArgName = "";
// Check to see if this is a positional argument. This argument is
// considered to be positional if it doesn't start with '-', if it is "-"
// itself, or if we have seen "--" already.
//
if (argv[i][0] != '-' || argv[i][1] == 0 || DashDashFound) {
// Positional argument!
if (ActivePositionalArg) {
ProvidePositionalOption(ActivePositionalArg, argv[i], i);
continue; // We are done!
} else if (!PositionalOpts.empty()) {
PositionalVals.push_back(std::make_pair(argv[i],i));
// All of the positional arguments have been fulfulled, give the rest to
// the consume after option... if it's specified...
//
if (PositionalVals.size() >= NumPositionalRequired &&
ConsumeAfterOpt != 0) {
for (++i; i < argc; ++i)
PositionalVals.push_back(std::make_pair(argv[i],i));
break; // Handle outside of the argument processing loop...
}
// Delay processing positional arguments until the end...
continue;
}
} else if (argv[i][0] == '-' && argv[i][1] == '-' && argv[i][2] == 0 &&
!DashDashFound) {
DashDashFound = true; // This is the mythical "--"?
continue; // Don't try to process it as an argument itself.
} else if (ActivePositionalArg &&
(ActivePositionalArg->getMiscFlags() & PositionalEatsArgs)) {
// If there is a positional argument eating options, check to see if this
// option is another positional argument. If so, treat it as an argument,
// otherwise feed it to the eating positional.
ArgName = argv[i]+1;
Handler = LookupOption(ArgName, Value);
if (!Handler || Handler->getFormattingFlag() != cl::Positional) {
ProvidePositionalOption(ActivePositionalArg, argv[i], i);
continue; // We are done!
}
} else { // We start with a '-', must be an argument...
ArgName = argv[i]+1;
Handler = LookupOption(ArgName, Value);
// Check to see if this "option" is really a prefixed or grouped argument.
if (Handler == 0) {
std::string RealName(ArgName);
if (RealName.size() > 1) {
unsigned Length = 0;
Option *PGOpt = getOptionPred(RealName, Length, isPrefixedOrGrouping);
// If the option is a prefixed option, then the value is simply the
// rest of the name... so fall through to later processing, by
// setting up the argument name flags and value fields.
//
if (PGOpt && PGOpt->getFormattingFlag() == cl::Prefix) {
Value = ArgName+Length;
assert(Opts.find(std::string(ArgName, Value)) != Opts.end() &&
Opts.find(std::string(ArgName, Value))->second == PGOpt);
Handler = PGOpt;
} else if (PGOpt) {
// This must be a grouped option... handle them now.
assert(isGrouping(PGOpt) && "Broken getOptionPred!");
do {
// Move current arg name out of RealName into RealArgName...
std::string RealArgName(RealName.begin(),
RealName.begin() + Length);
RealName.erase(RealName.begin(), RealName.begin() + Length);
// Because ValueRequired is an invalid flag for grouped arguments,
// we don't need to pass argc/argv in...
//
assert(PGOpt->getValueExpectedFlag() != cl::ValueRequired &&
"Option can not be cl::Grouping AND cl::ValueRequired!");
int Dummy;
ErrorParsing |= ProvideOption(PGOpt, RealArgName.c_str(),
0, 0, 0, Dummy);
// Get the next grouping option...
PGOpt = getOptionPred(RealName, Length, isGrouping);
} while (PGOpt && Length != RealName.size());
Handler = PGOpt; // Ate all of the options.
}
}
}
}
if (Handler == 0) {
std::cerr << ProgramName << ": Unknown command line argument '"
<< argv[i] << "'. Try: '" << argv[0] << " --help'\n";
ErrorParsing = true;
continue;
}
// Check to see if this option accepts a comma separated list of values. If
// it does, we have to split up the value into multiple values...
if (Value && Handler->getMiscFlags() & CommaSeparated) {
std::string Val(Value);
std::string::size_type Pos = Val.find(',');
while (Pos != std::string::npos) {
// Process the portion before the comma...
ErrorParsing |= ProvideOption(Handler, ArgName,
std::string(Val.begin(),
Val.begin()+Pos).c_str(),
argc, argv, i);
// Erase the portion before the comma, AND the comma...
Val.erase(Val.begin(), Val.begin()+Pos+1);
Value += Pos+1; // Increment the original value pointer as well...
// Check for another comma...
Pos = Val.find(',');
}
}
// If this is a named positional argument, just remember that it is the
// active one...
if (Handler->getFormattingFlag() == cl::Positional)
ActivePositionalArg = Handler;
else
ErrorParsing |= ProvideOption(Handler, ArgName, Value, argc, argv, i);
}
// Check and handle positional arguments now...
if (NumPositionalRequired > PositionalVals.size()) {
std::cerr << ProgramName
<< ": Not enough positional command line arguments specified!\n"
<< "Must specify at least " << NumPositionalRequired
<< " positional arguments: See: " << argv[0] << " --help\n";
ErrorParsing = true;
} else if (!HasUnlimitedPositionals
&& PositionalVals.size() > PositionalOpts.size()) {
std::cerr << ProgramName
<< ": Too many positional arguments specified!\n"
<< "Can specify at most " << PositionalOpts.size()
<< " positional arguments: See: " << argv[0] << " --help\n";
ErrorParsing = true;
} else if (ConsumeAfterOpt == 0) {
// Positional args have already been handled if ConsumeAfter is specified...
unsigned ValNo = 0, NumVals = PositionalVals.size();
for (unsigned i = 0, e = PositionalOpts.size(); i != e; ++i) {
if (RequiresValue(PositionalOpts[i])) {
ProvidePositionalOption(PositionalOpts[i], PositionalVals[ValNo].first,
PositionalVals[ValNo].second);
ValNo++;
--NumPositionalRequired; // We fulfilled our duty...
}
// If we _can_ give this option more arguments, do so now, as long as we
// do not give it values that others need. 'Done' controls whether the
// option even _WANTS_ any more.
//
bool Done = PositionalOpts[i]->getNumOccurrencesFlag() == cl::Required;
while (NumVals-ValNo > NumPositionalRequired && !Done) {
switch (PositionalOpts[i]->getNumOccurrencesFlag()) {
case cl::Optional:
Done = true; // Optional arguments want _at most_ one value
// FALL THROUGH
case cl::ZeroOrMore: // Zero or more will take all they can get...
case cl::OneOrMore: // One or more will take all they can get...
ProvidePositionalOption(PositionalOpts[i],
PositionalVals[ValNo].first,
PositionalVals[ValNo].second);
ValNo++;
break;
default:
assert(0 && "Internal error, unexpected NumOccurrences flag in "
"positional argument processing!");
}
}
}
} else {
assert(ConsumeAfterOpt && NumPositionalRequired <= PositionalVals.size());
unsigned ValNo = 0;
for (unsigned j = 1, e = PositionalOpts.size(); j != e; ++j)
if (RequiresValue(PositionalOpts[j])) {
ErrorParsing |= ProvidePositionalOption(PositionalOpts[j],
PositionalVals[ValNo].first,
PositionalVals[ValNo].second);
ValNo++;
}
// Handle the case where there is just one positional option, and it's
// optional. In this case, we want to give JUST THE FIRST option to the
// positional option and keep the rest for the consume after. The above
// loop would have assigned no values to positional options in this case.
//
if (PositionalOpts.size() == 2 && ValNo == 0 && !PositionalVals.empty()) {
ErrorParsing |= ProvidePositionalOption(PositionalOpts[1],
PositionalVals[ValNo].first,
PositionalVals[ValNo].second);
ValNo++;
}
// Handle over all of the rest of the arguments to the
// cl::ConsumeAfter command line option...
for (; ValNo != PositionalVals.size(); ++ValNo)
ErrorParsing |= ProvidePositionalOption(ConsumeAfterOpt,
PositionalVals[ValNo].first,
PositionalVals[ValNo].second);
}
// Loop over args and make sure all required args are specified!
for (std::map<std::string, Option*>::iterator I = Opts.begin(),
E = Opts.end(); I != E; ++I) {
switch (I->second->getNumOccurrencesFlag()) {
case Required:
case OneOrMore:
if (I->second->getNumOccurrences() == 0) {
I->second->error(" must be specified at least once!");
ErrorParsing = true;
}
// Fall through
default:
break;
}
}
// Free all of the memory allocated to the map. Command line options may only
// be processed once!
getOpts().clear();
PositionalOpts.clear();
MoreHelp().clear();
// If we had an error processing our arguments, don't let the program execute
if (ErrorParsing) exit(1);
}
//===----------------------------------------------------------------------===//
// Option Base class implementation
//
bool Option::error(std::string Message, const char *ArgName) {
if (ArgName == 0) ArgName = ArgStr;
if (ArgName[0] == 0)
std::cerr << HelpStr; // Be nice for positional arguments
else
std::cerr << ProgramName << ": for the -" << ArgName;
std::cerr << " option: " << Message << "\n";
return true;
}
bool Option::addOccurrence(unsigned pos, const char *ArgName,
const std::string &Value) {
NumOccurrences++; // Increment the number of times we have been seen
switch (getNumOccurrencesFlag()) {
case Optional:
if (NumOccurrences > 1)
return error(": may only occur zero or one times!", ArgName);
break;
case Required:
if (NumOccurrences > 1)
return error(": must occur exactly one time!", ArgName);
// Fall through
case OneOrMore:
case ZeroOrMore:
case ConsumeAfter: break;
default: return error(": bad num occurrences flag value!");
}
return handleOccurrence(pos, ArgName, Value);
}
// addArgument - Tell the system that this Option subclass will handle all
// occurrences of -ArgStr on the command line.
//
void Option::addArgument(const char *ArgStr) {
if (ArgStr[0])
AddArgument(ArgStr, this);
if (getFormattingFlag() == Positional)
getPositionalOpts().push_back(this);
else if (getNumOccurrencesFlag() == ConsumeAfter) {
if (!getPositionalOpts().empty() &&
getPositionalOpts().front()->getNumOccurrencesFlag() == ConsumeAfter)
error("Cannot specify more than one option with cl::ConsumeAfter!");
getPositionalOpts().insert(getPositionalOpts().begin(), this);
}
}
void Option::removeArgument(const char *ArgStr) {
if (ArgStr[0])
RemoveArgument(ArgStr, this);
if (getFormattingFlag() == Positional) {
std::vector<Option*>::iterator I =
std::find(getPositionalOpts().begin(), getPositionalOpts().end(), this);
assert(I != getPositionalOpts().end() && "Arg not registered!");
getPositionalOpts().erase(I);
} else if (getNumOccurrencesFlag() == ConsumeAfter) {
assert(!getPositionalOpts().empty() && getPositionalOpts()[0] == this &&
"Arg not registered correctly!");
getPositionalOpts().erase(getPositionalOpts().begin());
}
}
// getValueStr - Get the value description string, using "DefaultMsg" if nothing
// has been specified yet.
//
static const char *getValueStr(const Option &O, const char *DefaultMsg) {
if (O.ValueStr[0] == 0) return DefaultMsg;
return O.ValueStr;
}
//===----------------------------------------------------------------------===//
// cl::alias class implementation
//
// Return the width of the option tag for printing...
unsigned alias::getOptionWidth() const {
return std::strlen(ArgStr)+6;
}
// Print out the option for the alias.
void alias::printOptionInfo(unsigned GlobalWidth) const {
unsigned L = std::strlen(ArgStr);
std::cout << " -" << ArgStr << std::string(GlobalWidth-L-6, ' ') << " - "
<< HelpStr << "\n";
}
//===----------------------------------------------------------------------===//
// Parser Implementation code...
//
// basic_parser implementation
//
// Return the width of the option tag for printing...
unsigned basic_parser_impl::getOptionWidth(const Option &O) const {
unsigned Len = std::strlen(O.ArgStr);
if (const char *ValName = getValueName())
Len += std::strlen(getValueStr(O, ValName))+3;
return Len + 6;
}
// printOptionInfo - Print out information about this option. The
// to-be-maintained width is specified.
//
void basic_parser_impl::printOptionInfo(const Option &O,
unsigned GlobalWidth) const {
std::cout << " -" << O.ArgStr;
if (const char *ValName = getValueName())
std::cout << "=<" << getValueStr(O, ValName) << ">";
std::cout << std::string(GlobalWidth-getOptionWidth(O), ' ') << " - "
<< O.HelpStr << "\n";
}
// parser<bool> implementation
//
bool parser<bool>::parse(Option &O, const char *ArgName,
const std::string &Arg, bool &Value) {
if (Arg == "" || Arg == "true" || Arg == "TRUE" || Arg == "True" ||
Arg == "1") {
Value = true;
} else if (Arg == "false" || Arg == "FALSE" || Arg == "False" || Arg == "0") {
Value = false;
} else {
return O.error(": '" + Arg +
"' is invalid value for boolean argument! Try 0 or 1");
}
return false;
}
// parser<int> implementation
//
bool parser<int>::parse(Option &O, const char *ArgName,
const std::string &Arg, int &Value) {
char *End;
Value = (int)strtol(Arg.c_str(), &End, 0);
if (*End != 0)
return O.error(": '" + Arg + "' value invalid for integer argument!");
return false;
}
// parser<unsigned> implementation
//
bool parser<unsigned>::parse(Option &O, const char *ArgName,
const std::string &Arg, unsigned &Value) {
char *End;
errno = 0;
unsigned long V = strtoul(Arg.c_str(), &End, 0);
Value = (unsigned)V;
if (((V == ULONG_MAX) && (errno == ERANGE))
|| (*End != 0)
|| (Value != V))
return O.error(": '" + Arg + "' value invalid for uint argument!");
return false;
}
// parser<double>/parser<float> implementation
//
static bool parseDouble(Option &O, const std::string &Arg, double &Value) {
const char *ArgStart = Arg.c_str();
char *End;
Value = strtod(ArgStart, &End);
if (*End != 0)
return O.error(": '" +Arg+ "' value invalid for floating point argument!");
return false;
}
bool parser<double>::parse(Option &O, const char *AN,
const std::string &Arg, double &Val) {
return parseDouble(O, Arg, Val);
}
bool parser<float>::parse(Option &O, const char *AN,
const std::string &Arg, float &Val) {
double dVal;
if (parseDouble(O, Arg, dVal))
return true;
Val = (float)dVal;
return false;
}
// generic_parser_base implementation
//
// findOption - Return the option number corresponding to the specified
// argument string. If the option is not found, getNumOptions() is returned.
//
unsigned generic_parser_base::findOption(const char *Name) {
unsigned i = 0, e = getNumOptions();
std::string N(Name);
while (i != e)
if (getOption(i) == N)
return i;
else
++i;
return e;
}
// Return the width of the option tag for printing...
unsigned generic_parser_base::getOptionWidth(const Option &O) const {
if (O.hasArgStr()) {
unsigned Size = std::strlen(O.ArgStr)+6;
for (unsigned i = 0, e = getNumOptions(); i != e; ++i)
Size = std::max(Size, (unsigned)std::strlen(getOption(i))+8);
return Size;
} else {
unsigned BaseSize = 0;
for (unsigned i = 0, e = getNumOptions(); i != e; ++i)
BaseSize = std::max(BaseSize, (unsigned)std::strlen(getOption(i))+8);
return BaseSize;
}
}
// printOptionInfo - Print out information about this option. The
// to-be-maintained width is specified.
//
void generic_parser_base::printOptionInfo(const Option &O,
unsigned GlobalWidth) const {
if (O.hasArgStr()) {
unsigned L = std::strlen(O.ArgStr);
std::cout << " -" << O.ArgStr << std::string(GlobalWidth-L-6, ' ')
<< " - " << O.HelpStr << "\n";
for (unsigned i = 0, e = getNumOptions(); i != e; ++i) {
unsigned NumSpaces = GlobalWidth-strlen(getOption(i))-8;
std::cout << " =" << getOption(i) << std::string(NumSpaces, ' ')
<< " - " << getDescription(i) << "\n";
}
} else {
if (O.HelpStr[0])
std::cout << " " << O.HelpStr << "\n";
for (unsigned i = 0, e = getNumOptions(); i != e; ++i) {
unsigned L = std::strlen(getOption(i));
std::cout << " -" << getOption(i) << std::string(GlobalWidth-L-8, ' ')
<< " - " << getDescription(i) << "\n";
}
}
}
//===----------------------------------------------------------------------===//
// --help and --help-hidden option implementation
//
namespace {
class HelpPrinter {
unsigned MaxArgLen;
const Option *EmptyArg;
const bool ShowHidden;
// isHidden/isReallyHidden - Predicates to be used to filter down arg lists.
inline static bool isHidden(std::pair<std::string, Option *> &OptPair) {
return OptPair.second->getOptionHiddenFlag() >= Hidden;
}
inline static bool isReallyHidden(std::pair<std::string, Option *> &OptPair) {
return OptPair.second->getOptionHiddenFlag() == ReallyHidden;
}
public:
HelpPrinter(bool showHidden) : ShowHidden(showHidden) {
EmptyArg = 0;
}
void operator=(bool Value) {
if (Value == false) return;
// Copy Options into a vector so we can sort them as we like...
std::vector<std::pair<std::string, Option*> > Options;
copy(getOpts().begin(), getOpts().end(), std::back_inserter(Options));
// Eliminate Hidden or ReallyHidden arguments, depending on ShowHidden
Options.erase(std::remove_if(Options.begin(), Options.end(),
std::ptr_fun(ShowHidden ? isReallyHidden : isHidden)),
Options.end());
// Eliminate duplicate entries in table (from enum flags options, f.e.)
{ // Give OptionSet a scope
std::set<Option*> OptionSet;
for (unsigned i = 0; i != Options.size(); ++i)
if (OptionSet.count(Options[i].second) == 0)
OptionSet.insert(Options[i].second); // Add new entry to set
else
Options.erase(Options.begin()+i--); // Erase duplicate
}
if (ProgramOverview)
std::cout << "OVERVIEW:" << ProgramOverview << "\n";
std::cout << "USAGE: " << ProgramName << " [options]";
// Print out the positional options...
std::vector<Option*> &PosOpts = getPositionalOpts();
Option *CAOpt = 0; // The cl::ConsumeAfter option, if it exists...
if (!PosOpts.empty() && PosOpts[0]->getNumOccurrencesFlag() == ConsumeAfter)
CAOpt = PosOpts[0];
for (unsigned i = CAOpt != 0, e = PosOpts.size(); i != e; ++i) {
if (PosOpts[i]->ArgStr[0])
std::cout << " --" << PosOpts[i]->ArgStr;
std::cout << " " << PosOpts[i]->HelpStr;
}
// Print the consume after option info if it exists...
if (CAOpt) std::cout << " " << CAOpt->HelpStr;
std::cout << "\n\n";
// Compute the maximum argument length...
MaxArgLen = 0;
for (unsigned i = 0, e = Options.size(); i != e; ++i)
MaxArgLen = std::max(MaxArgLen, Options[i].second->getOptionWidth());
std::cout << "OPTIONS:\n";
for (unsigned i = 0, e = Options.size(); i != e; ++i)
Options[i].second->printOptionInfo(MaxArgLen);
// Print any extra help the user has declared.
for (std::vector<const char *>::iterator I = MoreHelp().begin(),
E = MoreHelp().end(); I != E; ++I)
std::cout << *I;
MoreHelp().clear();
// Halt the program since help information was printed
getOpts().clear(); // Don't bother making option dtors remove from map.
exit(1);
}
};
// Define the two HelpPrinter instances that are used to print out help, or
// help-hidden...
//
HelpPrinter NormalPrinter(false);
HelpPrinter HiddenPrinter(true);
cl::opt<HelpPrinter, true, parser<bool> >
HOp("help", cl::desc("Display available options (--help-hidden for more)"),
cl::location(NormalPrinter), cl::ValueDisallowed);
cl::opt<HelpPrinter, true, parser<bool> >
HHOp("help-hidden", cl::desc("Display all available options"),
cl::location(HiddenPrinter), cl::Hidden, cl::ValueDisallowed);
void (*OverrideVersionPrinter)() = 0;
class VersionPrinter {
public:
void operator=(bool OptionWasSpecified) {
if (OptionWasSpecified) {
if (OverrideVersionPrinter == 0) {
std::cout << "Low Level Virtual Machine (http://llvm.org/):\n";
std::cout << " " << PACKAGE_NAME << " version " << PACKAGE_VERSION;
#ifdef LLVM_VERSION_INFO
std::cout << LLVM_VERSION_INFO;
#endif
std::cout << "\n ";
#ifndef __OPTIMIZE__
std::cout << "DEBUG build";
#else
std::cout << "Optimized build";
#endif
#ifndef NDEBUG
std::cout << " with assertions";
#endif
std::cout << ".\n";
getOpts().clear(); // Don't bother making option dtors remove from map.
exit(1);
} else {
(*OverrideVersionPrinter)();
exit(1);
}
}
}
};
// Define the --version option that prints out the LLVM version for the tool
VersionPrinter VersionPrinterInstance;
cl::opt<VersionPrinter, true, parser<bool> >
VersOp("version", cl::desc("Display the version of this program"),
cl::location(VersionPrinterInstance), cl::ValueDisallowed);
} // End anonymous namespace
// Utility function for printing the help message.
void cl::PrintHelpMessage() {
// This looks weird, but it actually prints the help message. The
// NormalPrinter variable is a HelpPrinter and the help gets printed when
// its operator= is invoked. That's because the "normal" usages of the
// help printer is to be assigned true/false depending on whether the
// --help option was given or not. Since we're circumventing that we have
// to make it look like --help was given, so we assign true.
NormalPrinter = true;
}
void cl::SetVersionPrinter(void (*func)()) {
OverrideVersionPrinter = func;
}
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