291 lines
8.9 KiB
C++
291 lines
8.9 KiB
C++
//===- OptParserEmitter.cpp - Table Driven Command Line Parsing -----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/TableGen/Error.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/TableGen/Record.h"
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#include "llvm/TableGen/TableGenBackend.h"
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#include <cctype>
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#include <cstring>
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#include <map>
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using namespace llvm;
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// Ordering on Info. The logic should match with the consumer-side function in
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// llvm/Option/OptTable.h.
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static int StrCmpOptionName(const char *A, const char *B) {
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const char *X = A, *Y = B;
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char a = tolower(*A), b = tolower(*B);
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while (a == b) {
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if (a == '\0')
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return strcmp(A, B);
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a = tolower(*++X);
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b = tolower(*++Y);
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}
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if (a == '\0') // A is a prefix of B.
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return 1;
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if (b == '\0') // B is a prefix of A.
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return -1;
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// Otherwise lexicographic.
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return (a < b) ? -1 : 1;
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}
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static int CompareOptionRecords(Record *const *Av, Record *const *Bv) {
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const Record *A = *Av;
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const Record *B = *Bv;
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// Sentinel options precede all others and are only ordered by precedence.
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bool ASent = A->getValueAsDef("Kind")->getValueAsBit("Sentinel");
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bool BSent = B->getValueAsDef("Kind")->getValueAsBit("Sentinel");
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if (ASent != BSent)
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return ASent ? -1 : 1;
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// Compare options by name, unless they are sentinels.
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if (!ASent)
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if (int Cmp = StrCmpOptionName(A->getValueAsString("Name").c_str(),
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B->getValueAsString("Name").c_str()))
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return Cmp;
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if (!ASent) {
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std::vector<std::string> APrefixes = A->getValueAsListOfStrings("Prefixes");
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std::vector<std::string> BPrefixes = B->getValueAsListOfStrings("Prefixes");
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for (std::vector<std::string>::const_iterator APre = APrefixes.begin(),
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AEPre = APrefixes.end(),
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BPre = BPrefixes.begin(),
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BEPre = BPrefixes.end();
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APre != AEPre &&
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BPre != BEPre;
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++APre, ++BPre) {
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if (int Cmp = StrCmpOptionName(APre->c_str(), BPre->c_str()))
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return Cmp;
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}
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}
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// Then by the kind precedence;
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int APrec = A->getValueAsDef("Kind")->getValueAsInt("Precedence");
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int BPrec = B->getValueAsDef("Kind")->getValueAsInt("Precedence");
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if (APrec == BPrec &&
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A->getValueAsListOfStrings("Prefixes") ==
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B->getValueAsListOfStrings("Prefixes")) {
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PrintError(A->getLoc(), Twine("Option is equivalent to"));
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PrintError(B->getLoc(), Twine("Other defined here"));
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PrintFatalError("Equivalent Options found.");
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}
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return APrec < BPrec ? -1 : 1;
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}
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static const std::string getOptionName(const Record &R) {
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// Use the record name unless EnumName is defined.
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if (isa<UnsetInit>(R.getValueInit("EnumName")))
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return R.getName();
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return R.getValueAsString("EnumName");
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}
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static raw_ostream &write_cstring(raw_ostream &OS, llvm::StringRef Str) {
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OS << '"';
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OS.write_escaped(Str);
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OS << '"';
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return OS;
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}
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/// OptParserEmitter - This tablegen backend takes an input .td file
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/// describing a list of options and emits a data structure for parsing and
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/// working with those options when given an input command line.
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namespace llvm {
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void EmitOptParser(RecordKeeper &Records, raw_ostream &OS) {
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// Get the option groups and options.
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const std::vector<Record*> &Groups =
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Records.getAllDerivedDefinitions("OptionGroup");
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std::vector<Record*> Opts = Records.getAllDerivedDefinitions("Option");
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emitSourceFileHeader("Option Parsing Definitions", OS);
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array_pod_sort(Opts.begin(), Opts.end(), CompareOptionRecords);
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// Generate prefix groups.
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typedef SmallVector<SmallString<2>, 2> PrefixKeyT;
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typedef std::map<PrefixKeyT, std::string> PrefixesT;
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PrefixesT Prefixes;
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Prefixes.insert(std::make_pair(PrefixKeyT(), "prefix_0"));
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unsigned CurPrefix = 0;
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for (unsigned i = 0, e = Opts.size(); i != e; ++i) {
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const Record &R = *Opts[i];
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std::vector<std::string> prf = R.getValueAsListOfStrings("Prefixes");
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PrefixKeyT prfkey(prf.begin(), prf.end());
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unsigned NewPrefix = CurPrefix + 1;
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if (Prefixes.insert(std::make_pair(prfkey, (Twine("prefix_") +
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Twine(NewPrefix)).str())).second)
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CurPrefix = NewPrefix;
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}
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// Dump prefixes.
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OS << "/////////\n";
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OS << "// Prefixes\n\n";
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OS << "#ifdef PREFIX\n";
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OS << "#define COMMA ,\n";
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for (PrefixesT::const_iterator I = Prefixes.begin(), E = Prefixes.end();
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I != E; ++I) {
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OS << "PREFIX(";
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// Prefix name.
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OS << I->second;
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// Prefix values.
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OS << ", {";
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for (PrefixKeyT::const_iterator PI = I->first.begin(),
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PE = I->first.end(); PI != PE; ++PI) {
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OS << "\"" << *PI << "\" COMMA ";
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}
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OS << "nullptr})\n";
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}
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OS << "#undef COMMA\n";
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OS << "#endif // PREFIX\n\n";
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OS << "/////////\n";
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OS << "// Groups\n\n";
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OS << "#ifdef OPTION\n";
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for (unsigned i = 0, e = Groups.size(); i != e; ++i) {
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const Record &R = *Groups[i];
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// Start a single option entry.
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OS << "OPTION(";
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// The option prefix;
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OS << "nullptr";
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// The option string.
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OS << ", \"" << R.getValueAsString("Name") << '"';
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// The option identifier name.
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OS << ", "<< getOptionName(R);
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// The option kind.
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OS << ", Group";
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// The containing option group (if any).
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OS << ", ";
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if (const DefInit *DI = dyn_cast<DefInit>(R.getValueInit("Group")))
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OS << getOptionName(*DI->getDef());
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else
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OS << "INVALID";
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// The other option arguments (unused for groups).
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OS << ", INVALID, nullptr, 0, 0";
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// The option help text.
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if (!isa<UnsetInit>(R.getValueInit("HelpText"))) {
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OS << ",\n";
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OS << " ";
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write_cstring(OS, R.getValueAsString("HelpText"));
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} else
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OS << ", nullptr";
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// The option meta-variable name (unused).
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OS << ", nullptr)\n";
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}
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OS << "\n";
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OS << "//////////\n";
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OS << "// Options\n\n";
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for (unsigned i = 0, e = Opts.size(); i != e; ++i) {
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const Record &R = *Opts[i];
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// Start a single option entry.
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OS << "OPTION(";
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// The option prefix;
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std::vector<std::string> prf = R.getValueAsListOfStrings("Prefixes");
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OS << Prefixes[PrefixKeyT(prf.begin(), prf.end())] << ", ";
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// The option string.
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write_cstring(OS, R.getValueAsString("Name"));
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// The option identifier name.
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OS << ", "<< getOptionName(R);
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// The option kind.
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OS << ", " << R.getValueAsDef("Kind")->getValueAsString("Name");
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// The containing option group (if any).
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OS << ", ";
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const ListInit *GroupFlags = nullptr;
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if (const DefInit *DI = dyn_cast<DefInit>(R.getValueInit("Group"))) {
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GroupFlags = DI->getDef()->getValueAsListInit("Flags");
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OS << getOptionName(*DI->getDef());
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} else
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OS << "INVALID";
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// The option alias (if any).
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OS << ", ";
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if (const DefInit *DI = dyn_cast<DefInit>(R.getValueInit("Alias")))
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OS << getOptionName(*DI->getDef());
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else
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OS << "INVALID";
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// The option alias arguments (if any).
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// Emitted as a \0 separated list in a string, e.g. ["foo", "bar"]
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// would become "foo\0bar\0". Note that the compiler adds an implicit
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// terminating \0 at the end.
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OS << ", ";
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std::vector<std::string> AliasArgs = R.getValueAsListOfStrings("AliasArgs");
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if (AliasArgs.size() == 0) {
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OS << "nullptr";
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} else {
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OS << "\"";
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for (size_t i = 0, e = AliasArgs.size(); i != e; ++i)
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OS << AliasArgs[i] << "\\0";
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OS << "\"";
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}
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// The option flags.
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OS << ", ";
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int NumFlags = 0;
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const ListInit *LI = R.getValueAsListInit("Flags");
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for (Init *I : *LI)
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OS << (NumFlags++ ? " | " : "")
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<< cast<DefInit>(I)->getDef()->getName();
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if (GroupFlags) {
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for (Init *I : *GroupFlags)
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OS << (NumFlags++ ? " | " : "")
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<< cast<DefInit>(I)->getDef()->getName();
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}
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if (NumFlags == 0)
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OS << '0';
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// The option parameter field.
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OS << ", " << R.getValueAsInt("NumArgs");
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// The option help text.
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if (!isa<UnsetInit>(R.getValueInit("HelpText"))) {
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OS << ",\n";
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OS << " ";
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write_cstring(OS, R.getValueAsString("HelpText"));
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} else
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OS << ", nullptr";
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// The option meta-variable name.
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OS << ", ";
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if (!isa<UnsetInit>(R.getValueInit("MetaVarName")))
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write_cstring(OS, R.getValueAsString("MetaVarName"));
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else
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OS << "nullptr";
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OS << ")\n";
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}
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OS << "#endif // OPTION\n";
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}
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} // end namespace llvm
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