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9878d6ae3a
llvm/lib/Support/CommandLine.cpp
Chris Lattner 9878d6ae3a rearchitect the registration mechanism used by the command line option stuff. 
This dramatically reduce the amount of memory allocated by the commandline stuff
at static init time, changing it to build local data structures when ParseCommandLineOptions
is called.  In a dummy empty program that links some llvm libraries, this reduces
the number of malloc'd bytes from 4864 to 3360 on entry to main.  Most of that
memory is now allocated by non-commandline related stuff.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35701 91177308-0d34-0410-b5e6-96231b3b80d8
2007-04-06 21:06:55 +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/Support/ManagedStatic.h"
#include "llvm/Support/Streams.h"
#include "llvm/System/Path.h"
#include <algorithm>
#include <functional>
#include <map>
#include <ostream>
#include <set>
#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. Program name is not a string to
// avoid static ctor/dtor issues.
static char ProgramName[80] = "<premain>";
static const char *ProgramOverview = 0;
// This collects additional help to be printed.
static ManagedStatic<std::vector<const char*> > MoreHelp;
extrahelp::extrahelp(const char *Help)
: morehelp(Help) {
MoreHelp->push_back(Help);
}
/// RegisteredOptionList - This is the list of the command line options that
/// have statically constructed themselves.
static Option *RegisteredOptionList = 0;
void Option::addArgument() {
assert(NextRegistered == 0 && "argument multiply registered!");
NextRegistered = RegisteredOptionList;
RegisteredOptionList = this;
}
//===----------------------------------------------------------------------===//
// Basic, shared command line option processing machinery.
//
/// GetOptionInfo - Scan the list of registered options, turning them into data
/// structures that are easier to handle.
static void GetOptionInfo(std::vector<Option*> &PositionalOpts,
std::map<std::string, Option*> &OptionsMap) {
std::vector<const char*> OptionNames;
for (Option *O = RegisteredOptionList; O; O = O->getNextRegisteredOption()) {
// If this option wants to handle multiple option names, get the full set.
// This handles enum options like "-O1 -O2" etc.
O->getExtraOptionNames(OptionNames);
if (O->ArgStr[0])
OptionNames.push_back(O->ArgStr);
// Handle named options.
for (unsigned i = 0, e = OptionNames.size(); i != e; ++i) {
// Add argument to the argument map!
if (!OptionsMap.insert(std::pair<std::string,Option*>(OptionNames[i],
O)).second) {
cerr << ProgramName << ": CommandLine Error: Argument '"
<< OptionNames[0] << "' defined more than once!\n";
}
}
OptionNames.clear();
// Remember information about positional options.
if (O->getFormattingFlag() == cl::Positional)
PositionalOpts.push_back(O);
else if (O->getNumOccurrencesFlag() == cl::ConsumeAfter) {
if (!PositionalOpts.empty() &&
PositionalOpts.front()->getNumOccurrencesFlag() == cl::ConsumeAfter)
O->error("Cannot specify more than one option with cl::ConsumeAfter!");
PositionalOpts.insert(PositionalOpts.begin(), O);
}
}
}
/// 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,
std::map<std::string, Option*> &OptionsMap) {
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*>::iterator I =
OptionsMap.find(std::string(Arg, ArgEnd));
return I != OptionsMap.end() ? I->second : 0;
}
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:
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*),
std::map<std::string, Option*> &OptionsMap) {
std::map<std::string, Option*>::iterator OMI = OptionsMap.find(Name);
if (OMI != OptionsMap.end() && Pred(OMI->second)) {
Length = Name.length();
return OMI->second;
}
if (Name.size() == 1) return 0;
do {
Name.erase(Name.end()-1, Name.end()); // Chop off the last character...
OMI = OptionsMap.find(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 ((OMI == OptionsMap.end() || !Pred(OMI->second)) && Name.size() > 1);
if (OMI != OptionsMap.end() && Pred(OMI->second)) {
Length = Name.length();
return OMI->second; // 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);
}
void cl::ParseCommandLineOptions(int &argc, char **argv,
const char *Overview) {
// Process all registered options.
std::vector<Option*> PositionalOpts;
std::map<std::string, Option*> Opts;
GetOptionInfo(PositionalOpts, Opts);
assert((!Opts.empty() || !PositionalOpts.empty()) &&
"No options specified!");
sys::Path progname(argv[0]);
// Copy the program name into ProgName, making sure not to overflow it.
std::string ProgName = sys::Path(argv[0]).getLast();
if (ProgName.size() > 79) ProgName.resize(79);
strcpy(ProgramName, ProgName.c_str());
ProgramOverview = Overview;
bool ErrorParsing = false;
// 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, Opts);
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, Opts);
// 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,
Opts);
// 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, Opts);
} while (PGOpt && Length != RealName.size());
Handler = PGOpt; // Ate all of the options.
}
}
}
}
if (Handler == 0) {
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()) {
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()) {
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!
Opts.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)
cerr << HelpStr; // Be nice for positional arguments
else
cerr << ProgramName << ": for the -" << ArgName;
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);
}
// 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);
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 {
cout << " -" << O.ArgStr;
if (const char *ValName = getValueName())
cout << "=<" << getValueStr(O, ValName) << ">";
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);
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;
cout << " =" << getOption(i) << std::string(NumSpaces, ' ')
<< " - " << getDescription(i) << "\n";
}
} else {
if (O.HelpStr[0])
cout << " " << O.HelpStr << "\n";
for (unsigned i = 0, e = getNumOptions(); i != e; ++i) {
unsigned L = std::strlen(getOption(i));
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;
// Get all the options.
std::vector<Option*> PositionalOpts;
std::map<std::string, Option*> OptMap;
GetOptionInfo(PositionalOpts, OptMap);
// Copy Options into a vector so we can sort them as we like...
std::vector<std::pair<std::string, Option*> > Opts;
copy(OptMap.begin(), OptMap.end(), std::back_inserter(Opts));
// Eliminate Hidden or ReallyHidden arguments, depending on ShowHidden
Opts.erase(std::remove_if(Opts.begin(), Opts.end(),
std::ptr_fun(ShowHidden ? isReallyHidden : isHidden)),
Opts.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 != Opts.size(); ++i)
if (OptionSet.count(Opts[i].second) == 0)
OptionSet.insert(Opts[i].second); // Add new entry to set
else
Opts.erase(Opts.begin()+i--); // Erase duplicate
}
if (ProgramOverview)
cout << "OVERVIEW:" << ProgramOverview << "\n";
cout << "USAGE: " << ProgramName << " [options]";
// Print out the positional options.
Option *CAOpt = 0; // The cl::ConsumeAfter option, if it exists...
if (!PositionalOpts.empty() &&
PositionalOpts[0]->getNumOccurrencesFlag() == ConsumeAfter)
CAOpt = PositionalOpts[0];
for (unsigned i = CAOpt != 0, e = PositionalOpts.size(); i != e; ++i) {
if (PositionalOpts[i]->ArgStr[0])
cout << " --" << PositionalOpts[i]->ArgStr;
cout << " " << PositionalOpts[i]->HelpStr;
}
// Print the consume after option info if it exists...
if (CAOpt) cout << " " << CAOpt->HelpStr;
cout << "\n\n";
// Compute the maximum argument length...
MaxArgLen = 0;
for (unsigned i = 0, e = Opts.size(); i != e; ++i)
MaxArgLen = std::max(MaxArgLen, Opts[i].second->getOptionWidth());
cout << "OPTIONS:\n";
for (unsigned i = 0, e = Opts.size(); i != e; ++i)
Opts[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)
cout << *I;
MoreHelp->clear();
// Halt the program since help information was printed
exit(1);
}
};
} // End anonymous namespace
// Define the two HelpPrinter instances that are used to print out help, or
// help-hidden...
//
static HelpPrinter NormalPrinter(false);
static HelpPrinter HiddenPrinter(true);
static cl::opt<HelpPrinter, true, parser<bool> >
HOp("help", cl::desc("Display available options (--help-hidden for more)"),
cl::location(NormalPrinter), cl::ValueDisallowed);
static cl::opt<HelpPrinter, true, parser<bool> >
HHOp("help-hidden", cl::desc("Display all available options"),
cl::location(HiddenPrinter), cl::Hidden, cl::ValueDisallowed);
static void (*OverrideVersionPrinter)() = 0;
namespace {
class VersionPrinter {
public:
void print() {
cout << "Low Level Virtual Machine (http://llvm.org/):\n";
cout << " " << PACKAGE_NAME << " version " << PACKAGE_VERSION;
#ifdef LLVM_VERSION_INFO
cout << LLVM_VERSION_INFO;
#endif
cout << "\n ";
#ifndef __OPTIMIZE__
cout << "DEBUG build";
#else
cout << "Optimized build";
#endif
#ifndef NDEBUG
cout << " with assertions";
#endif
cout << ".\n";
}
void operator=(bool OptionWasSpecified) {
if (OptionWasSpecified) {
if (OverrideVersionPrinter == 0) {
print();
exit(1);
} else {
(*OverrideVersionPrinter)();
exit(1);
}
}
}
};
} // End anonymous namespace
// Define the --version option that prints out the LLVM version for the tool
static VersionPrinter VersionPrinterInstance;
static cl::opt<VersionPrinter, true, parser<bool> >
VersOp("version", cl::desc("Display the version of this program"),
cl::location(VersionPrinterInstance), cl::ValueDisallowed);
// 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;
}
/// Utility function for printing version number.
void cl::PrintVersionMessage() {
VersionPrinterInstance.print();
}
void cl::SetVersionPrinter(void (*func)()) {
OverrideVersionPrinter = func;
}
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