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//===- OptParserEmitter.cpp - Table Driven Command Line Parsing -----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "OptParserEmitter.h"
#include "Record.h"
#include "llvm/ADT/STLExtras.h"
using namespace llvm;
static int StrCmpOptionName(const char *A, const char *B) {
char a = *A, b = *B;
while (a == b) {
if (a == '\0')
return 0;
a = *++A;
b = *++B;
}
if (a == '\0') // A is a prefix of B.
return 1;
if (b == '\0') // B is a prefix of A.
return -1;
// Otherwise lexicographic.
return (a < b) ? -1 : 1;
}
static int CompareOptionRecords(const void *Av, const void *Bv) {
const Record *A = *(Record**) Av;
const Record *B = *(Record**) Bv;
// Sentinel options preceed all others and are only ordered by precedence.
bool ASent = A->getValueAsDef("Kind")->getValueAsBit("Sentinel");
bool BSent = B->getValueAsDef("Kind")->getValueAsBit("Sentinel");
if (ASent != BSent)
return ASent ? -1 : 1;
// Compare options by name, unless they are sentinels.
if (!ASent)
if (int Cmp = StrCmpOptionName(A->getValueAsString("Name").c_str(),
B->getValueAsString("Name").c_str()))
return Cmp;
// Then by the kind precedence;
int APrec = A->getValueAsDef("Kind")->getValueAsInt("Precedence");
int BPrec = B->getValueAsDef("Kind")->getValueAsInt("Precedence");
assert(APrec != BPrec && "Options are equivalent!");
return APrec < BPrec ? -1 : 1;
}
static const std::string getOptionName(const Record &R) {
// Use the record name unless EnumName is defined.
if (dynamic_cast<UnsetInit*>(R.getValueInit("EnumName")))
return R.getName();
return R.getValueAsString("EnumName");
}
static raw_ostream &write_cstring(raw_ostream &OS, llvm::StringRef Str) {
OS << '"';
OS.write_escaped(Str);
OS << '"';
return OS;
}
void OptParserEmitter::run(raw_ostream &OS) {
// Get the option groups and options.
const std::vector<Record*> &Groups =
Records.getAllDerivedDefinitions("OptionGroup");
std::vector<Record*> Opts = Records.getAllDerivedDefinitions("Option");
if (GenDefs)
EmitSourceFileHeader("Option Parsing Definitions", OS);
else
EmitSourceFileHeader("Option Parsing Table", OS);
array_pod_sort(Opts.begin(), Opts.end(), CompareOptionRecords);
if (GenDefs) {
OS << "#ifndef OPTION\n";
OS << "#error \"Define OPTION prior to including this file!\"\n";
OS << "#endif\n\n";
OS << "/////////\n";
OS << "// Groups\n\n";
for (unsigned i = 0, e = Groups.size(); i != e; ++i) {
const Record &R = *Groups[i];
// Start a single option entry.
OS << "OPTION(";
// The option string.
OS << '"' << R.getValueAsString("Name") << '"';
// The option identifier name.
OS << ", "<< getOptionName(R);
// The option kind.
OS << ", Group";
// The containing option group (if any).
OS << ", ";
if (const DefInit *DI = dynamic_cast<DefInit*>(R.getValueInit("Group")))
OS << getOptionName(*DI->getDef());
else
OS << "INVALID";
// The other option arguments (unused for groups).
OS << ", INVALID, 0, 0";
// The option help text.
if (!dynamic_cast<UnsetInit*>(R.getValueInit("HelpText"))) {
OS << ",\n";
OS << " ";
write_cstring(OS, R.getValueAsString("HelpText"));
} else
OS << ", 0";
// The option meta-variable name (unused).
OS << ", 0)\n";
}
OS << "\n";
OS << "//////////\n";
OS << "// Options\n\n";
for (unsigned i = 0, e = Opts.size(); i != e; ++i) {
const Record &R = *Opts[i];
// Start a single option entry.
OS << "OPTION(";
// The option string.
write_cstring(OS, R.getValueAsString("Name"));
// The option identifier name.
OS << ", "<< getOptionName(R);
// The option kind.
OS << ", " << R.getValueAsDef("Kind")->getValueAsString("Name");
// The containing option group (if any).
OS << ", ";
if (const DefInit *DI = dynamic_cast<DefInit*>(R.getValueInit("Group")))
OS << getOptionName(*DI->getDef());
else
OS << "INVALID";
// The option alias (if any).
OS << ", ";
if (const DefInit *DI = dynamic_cast<DefInit*>(R.getValueInit("Alias")))
OS << getOptionName(*DI->getDef());
else
OS << "INVALID";
// The option flags.
const ListInit *LI = R.getValueAsListInit("Flags");
if (LI->empty()) {
OS << ", 0";
} else {
OS << ", ";
for (unsigned i = 0, e = LI->size(); i != e; ++i) {
if (i)
OS << " | ";
OS << dynamic_cast<DefInit*>(LI->getElement(i))->getDef()->getName();
}
}
// The option parameter field.
OS << ", " << R.getValueAsInt("NumArgs");
// The option help text.
if (!dynamic_cast<UnsetInit*>(R.getValueInit("HelpText"))) {
OS << ",\n";
OS << " ";
write_cstring(OS, R.getValueAsString("HelpText"));
} else
OS << ", 0";
// The option meta-variable name.
OS << ", ";
if (!dynamic_cast<UnsetInit*>(R.getValueInit("MetaVarName")))
write_cstring(OS, R.getValueAsString("MetaVarName"));
else
OS << "0";
OS << ")\n";
}
}
}
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