544 lines
22 KiB
C++
544 lines
22 KiB
C++
//===- OptTable.h - Option Table --------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_OPTION_OPTTABLE_H
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#define LLVM_OPTION_OPTTABLE_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/StringTable.h"
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#include "llvm/Option/OptSpecifier.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/StringSaver.h"
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#include <cassert>
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#include <string>
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#include <vector>
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namespace llvm {
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class raw_ostream;
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template <typename Fn> class function_ref;
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namespace opt {
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class Arg;
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class ArgList;
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class InputArgList;
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class Option;
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/// Helper for overload resolution while transitioning from
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/// FlagsToInclude/FlagsToExclude APIs to VisibilityMask APIs.
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class Visibility {
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unsigned Mask = ~0U;
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public:
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explicit Visibility(unsigned Mask) : Mask(Mask) {}
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Visibility() = default;
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operator unsigned() const { return Mask; }
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};
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/// Provide access to the Option info table.
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///
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/// The OptTable class provides a layer of indirection which allows Option
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/// instance to be created lazily. In the common case, only a few options will
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/// be needed at runtime; the OptTable class maintains enough information to
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/// parse command lines without instantiating Options, while letting other
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/// parts of the driver still use Option instances where convenient.
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class LLVM_ABI OptTable {
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public:
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/// Represents a subcommand and its options in the option table.
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struct SubCommand {
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const char *Name;
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const char *HelpText;
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const char *Usage;
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};
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/// Entry for a single option instance in the option data table.
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struct Info {
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unsigned PrefixesOffset;
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StringTable::Offset PrefixedNameOffset;
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const char *HelpText;
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// Help text for specific visibilities. A list of pairs, where each pair
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// is a list of visibilities and a specific help string for those
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// visibilities. If no help text is found in this list for the visibility of
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// the program, HelpText is used instead. This cannot use std::vector
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// because OptTable is used in constexpr contexts. Increase the array sizes
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// here if you need more entries and adjust the constants in
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// OptionParserEmitter::EmitHelpTextsForVariants.
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std::array<std::pair<std::array<unsigned int, 2 /*MaxVisibilityPerHelp*/>,
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const char *>,
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1 /*MaxVisibilityHelp*/>
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HelpTextsForVariants;
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const char *MetaVar;
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unsigned ID;
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unsigned char Kind;
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unsigned char Param;
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unsigned int Flags;
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unsigned int Visibility;
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unsigned short GroupID;
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unsigned short AliasID;
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const char *AliasArgs;
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const char *Values;
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// Offset into OptTable's SubCommandIDsTable.
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unsigned SubCommandIDsOffset;
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bool hasNoPrefix() const { return PrefixesOffset == 0; }
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unsigned getNumPrefixes(ArrayRef<StringTable::Offset> PrefixesTable) const {
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// We embed the number of prefixes in the value of the first offset.
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return PrefixesTable[PrefixesOffset].value();
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}
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ArrayRef<StringTable::Offset>
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getPrefixOffsets(ArrayRef<StringTable::Offset> PrefixesTable) const {
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return hasNoPrefix() ? ArrayRef<StringTable::Offset>()
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: PrefixesTable.slice(PrefixesOffset + 1,
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getNumPrefixes(PrefixesTable));
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}
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bool hasSubCommands() const { return SubCommandIDsOffset != 0; }
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unsigned getNumSubCommandIDs(ArrayRef<unsigned> SubCommandIDsTable) const {
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// We embed the number of subcommand IDs in the value of the first offset.
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return SubCommandIDsTable[SubCommandIDsOffset];
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}
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ArrayRef<unsigned>
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getSubCommandIDs(ArrayRef<unsigned> SubCommandIDsTable) const {
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return hasSubCommands() ? SubCommandIDsTable.slice(
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SubCommandIDsOffset + 1,
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getNumSubCommandIDs(SubCommandIDsTable))
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: ArrayRef<unsigned>();
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}
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void appendPrefixes(const StringTable &StrTable,
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ArrayRef<StringTable::Offset> PrefixesTable,
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SmallVectorImpl<StringRef> &Prefixes) const {
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for (auto PrefixOffset : getPrefixOffsets(PrefixesTable))
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Prefixes.push_back(StrTable[PrefixOffset]);
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}
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StringRef getPrefix(const StringTable &StrTable,
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ArrayRef<StringTable::Offset> PrefixesTable,
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unsigned PrefixIndex) const {
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return StrTable[getPrefixOffsets(PrefixesTable)[PrefixIndex]];
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}
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StringRef getPrefixedName(const StringTable &StrTable) const {
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return StrTable[PrefixedNameOffset];
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}
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StringRef getName(const StringTable &StrTable,
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ArrayRef<StringTable::Offset> PrefixesTable) const {
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unsigned PrefixLength =
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hasNoPrefix() ? 0 : getPrefix(StrTable, PrefixesTable, 0).size();
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return getPrefixedName(StrTable).drop_front(PrefixLength);
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}
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};
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public:
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bool isValidForSubCommand(const Info *CandidateInfo,
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StringRef SubCommand) const {
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assert(!SubCommand.empty() &&
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"This helper is only for valid registered subcommands.");
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auto SCIT = llvm::find_if(
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SubCommands, [&](const auto &C) { return SubCommand == C.Name; });
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assert(SCIT != SubCommands.end() &&
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"This helper is only for valid registered subcommands.");
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auto SubCommandIDs = CandidateInfo->getSubCommandIDs(SubCommandIDsTable);
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unsigned CurrentSubCommandID = SCIT - &SubCommands[0];
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return llvm::is_contained(SubCommandIDs, CurrentSubCommandID);
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}
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private:
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// A unified string table for these options. Individual strings are stored as
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// null terminated C-strings at offsets within this table.
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const StringTable *StrTable;
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// A table of different sets of prefixes. Each set starts with the number of
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// prefixes in that set followed by that many offsets into the string table
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// for each of the prefix strings. This is essentially a Pascal-string style
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// encoding.
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ArrayRef<StringTable::Offset> PrefixesTable;
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/// The option information table.
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ArrayRef<Info> OptionInfos;
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bool IgnoreCase;
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/// The subcommand information table.
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ArrayRef<SubCommand> SubCommands;
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/// The subcommand IDs table.
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ArrayRef<unsigned> SubCommandIDsTable;
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bool GroupedShortOptions = false;
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bool DashDashParsing = false;
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const char *EnvVar = nullptr;
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unsigned InputOptionID = 0;
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unsigned UnknownOptionID = 0;
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protected:
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/// The index of the first option which can be parsed (i.e., is not a
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/// special option like 'input' or 'unknown', and is not an option group).
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unsigned FirstSearchableIndex = 0;
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/// The union of all option prefixes. If an argument does not begin with
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/// one of these, it is an input.
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SmallVector<StringRef> PrefixesUnion;
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/// The union of the first element of all option prefixes.
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SmallString<8> PrefixChars;
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private:
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const Info &getInfo(OptSpecifier Opt) const {
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unsigned id = Opt.getID();
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assert(id > 0 && id - 1 < getNumOptions() && "Invalid Option ID.");
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return OptionInfos[id - 1];
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}
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std::unique_ptr<Arg> parseOneArgGrouped(InputArgList &Args,
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unsigned &Index) const;
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protected:
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/// Initialize OptTable using Tablegen'ed OptionInfos. Child class must
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/// manually call \c buildPrefixChars once they are fully constructed.
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OptTable(const StringTable &StrTable,
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ArrayRef<StringTable::Offset> PrefixesTable,
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ArrayRef<Info> OptionInfos, bool IgnoreCase = false,
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ArrayRef<SubCommand> SubCommands = {},
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ArrayRef<unsigned> SubCommandIDsTable = {});
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/// Build (or rebuild) the PrefixChars member.
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void buildPrefixChars();
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public:
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virtual ~OptTable();
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/// Return the string table used for option names.
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const StringTable &getStrTable() const { return *StrTable; }
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ArrayRef<SubCommand> getSubCommands() const { return SubCommands; }
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/// Return the prefixes table used for option names.
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ArrayRef<StringTable::Offset> getPrefixesTable() const {
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return PrefixesTable;
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}
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/// Return the total number of option classes.
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unsigned getNumOptions() const { return OptionInfos.size(); }
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/// Get the given Opt's Option instance, lazily creating it
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/// if necessary.
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///
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/// \return The option, or null for the INVALID option id.
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const Option getOption(OptSpecifier Opt) const;
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/// Lookup the name of the given option.
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StringRef getOptionName(OptSpecifier id) const {
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return getInfo(id).getName(*StrTable, PrefixesTable);
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}
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/// Lookup the prefix of the given option.
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StringRef getOptionPrefix(OptSpecifier id) const {
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const Info &I = getInfo(id);
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return I.hasNoPrefix() ? StringRef()
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: I.getPrefix(*StrTable, PrefixesTable, 0);
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}
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void appendOptionPrefixes(OptSpecifier id,
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SmallVectorImpl<StringRef> &Prefixes) const {
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const Info &I = getInfo(id);
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I.appendPrefixes(*StrTable, PrefixesTable, Prefixes);
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}
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/// Lookup the prefixed name of the given option.
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StringRef getOptionPrefixedName(OptSpecifier id) const {
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return getInfo(id).getPrefixedName(*StrTable);
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}
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/// Get the kind of the given option.
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unsigned getOptionKind(OptSpecifier id) const {
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return getInfo(id).Kind;
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}
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/// Get the group id for the given option.
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unsigned getOptionGroupID(OptSpecifier id) const {
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return getInfo(id).GroupID;
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}
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/// Get the help text to use to describe this option.
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const char *getOptionHelpText(OptSpecifier id) const {
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return getOptionHelpText(id, Visibility(0));
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}
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// Get the help text to use to describe this option.
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// If it has visibility specific help text and that visibility is in the
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// visibility mask, use that text instead of the generic text.
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const char *getOptionHelpText(OptSpecifier id,
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Visibility VisibilityMask) const {
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auto Info = getInfo(id);
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for (auto [Visibilities, Text] : Info.HelpTextsForVariants)
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for (auto Visibility : Visibilities)
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if (VisibilityMask & Visibility)
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return Text;
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return Info.HelpText;
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}
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/// Get the meta-variable name to use when describing
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/// this options values in the help text.
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const char *getOptionMetaVar(OptSpecifier id) const {
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return getInfo(id).MetaVar;
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}
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/// Specify the environment variable where initial options should be read.
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void setInitialOptionsFromEnvironment(const char *E) { EnvVar = E; }
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/// Support grouped short options. e.g. -ab represents -a -b.
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void setGroupedShortOptions(bool Value) { GroupedShortOptions = Value; }
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/// Set whether "--" stops option parsing and treats all subsequent arguments
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/// as positional. E.g. -- -a -b gives two positional inputs.
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void setDashDashParsing(bool Value) { DashDashParsing = Value; }
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/// Find possible value for given flags. This is used for shell
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/// autocompletion.
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///
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/// \param [in] Option - Key flag like "-stdlib=" when "-stdlib=l"
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/// was passed to clang.
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///
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/// \param [in] Arg - Value which we want to autocomplete like "l"
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/// when "-stdlib=l" was passed to clang.
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///
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/// \return The vector of possible values.
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std::vector<std::string> suggestValueCompletions(StringRef Option,
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StringRef Arg) const;
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/// Find flags from OptTable which starts with Cur.
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///
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/// \param [in] Cur - String prefix that all returned flags need
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// to start with.
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///
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/// \return The vector of flags which start with Cur.
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std::vector<std::string> findByPrefix(StringRef Cur,
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Visibility VisibilityMask,
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unsigned int DisableFlags) const;
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/// Find the OptTable option that most closely matches the given string.
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///
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/// \param [in] Option - A string, such as "-stdlibs=l", that represents user
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/// input of an option that may not exist in the OptTable. Note that the
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/// string includes prefix dashes "-" as well as values "=l".
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/// \param [out] NearestString - The nearest option string found in the
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/// OptTable.
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/// \param [in] VisibilityMask - Only include options with any of these
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/// visibility flags set.
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/// \param [in] MinimumLength - Don't find options shorter than this length.
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/// For example, a minimum length of 3 prevents "-x" from being considered
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/// near to "-S".
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/// \param [in] MaximumDistance - Don't find options whose distance is greater
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/// than this value.
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///
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/// \return The edit distance of the nearest string found.
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unsigned findNearest(StringRef Option, std::string &NearestString,
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Visibility VisibilityMask = Visibility(),
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unsigned MinimumLength = 4,
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unsigned MaximumDistance = UINT_MAX) const;
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unsigned findNearest(StringRef Option, std::string &NearestString,
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unsigned FlagsToInclude, unsigned FlagsToExclude = 0,
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unsigned MinimumLength = 4,
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unsigned MaximumDistance = UINT_MAX) const;
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private:
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unsigned
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internalFindNearest(StringRef Option, std::string &NearestString,
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unsigned MinimumLength, unsigned MaximumDistance,
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std::function<bool(const Info &)> ExcludeOption) const;
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public:
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bool findExact(StringRef Option, std::string &ExactString,
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Visibility VisibilityMask = Visibility()) const {
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return findNearest(Option, ExactString, VisibilityMask, 4, 0) == 0;
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}
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bool findExact(StringRef Option, std::string &ExactString,
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unsigned FlagsToInclude, unsigned FlagsToExclude = 0) const {
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return findNearest(Option, ExactString, FlagsToInclude, FlagsToExclude, 4,
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0) == 0;
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}
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/// Parse a single argument; returning the new argument and
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/// updating Index.
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///
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/// \param [in,out] Index - The current parsing position in the argument
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/// string list; on return this will be the index of the next argument
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/// string to parse.
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/// \param [in] VisibilityMask - Only include options with any of these
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/// visibility flags set.
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///
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/// \return The parsed argument, or 0 if the argument is missing values
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/// (in which case Index still points at the conceptual next argument string
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/// to parse).
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std::unique_ptr<Arg>
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ParseOneArg(const ArgList &Args, unsigned &Index,
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Visibility VisibilityMask = Visibility()) const;
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std::unique_ptr<Arg> ParseOneArg(const ArgList &Args, unsigned &Index,
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unsigned FlagsToInclude,
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unsigned FlagsToExclude) const;
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private:
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std::unique_ptr<Arg>
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internalParseOneArg(const ArgList &Args, unsigned &Index,
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std::function<bool(const Option &)> ExcludeOption) const;
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public:
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/// Parse an list of arguments into an InputArgList.
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///
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/// The resulting InputArgList will reference the strings in [\p ArgBegin,
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/// \p ArgEnd), and their lifetime should extend past that of the returned
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/// InputArgList.
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///
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/// The only error that can occur in this routine is if an argument is
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/// missing values; in this case \p MissingArgCount will be non-zero.
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///
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/// \param MissingArgIndex - On error, the index of the option which could
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/// not be parsed.
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/// \param MissingArgCount - On error, the number of missing options.
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/// \param VisibilityMask - Only include options with any of these
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/// visibility flags set.
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/// \return An InputArgList; on error this will contain all the options
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/// which could be parsed.
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InputArgList ParseArgs(ArrayRef<const char *> Args, unsigned &MissingArgIndex,
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unsigned &MissingArgCount,
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Visibility VisibilityMask = Visibility()) const;
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InputArgList ParseArgs(ArrayRef<const char *> Args, unsigned &MissingArgIndex,
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unsigned &MissingArgCount, unsigned FlagsToInclude,
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unsigned FlagsToExclude = 0) const;
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private:
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InputArgList
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internalParseArgs(ArrayRef<const char *> Args, unsigned &MissingArgIndex,
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unsigned &MissingArgCount,
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std::function<bool(const Option &)> ExcludeOption) const;
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public:
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/// A convenience helper which handles optional initial options populated from
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/// an environment variable, expands response files recursively and parses
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/// options.
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///
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/// \param ErrorFn - Called on a formatted error message for missing arguments
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/// or unknown options.
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/// \return An InputArgList; on error this will contain all the options which
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/// could be parsed.
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InputArgList parseArgs(int Argc, char *const *Argv, OptSpecifier Unknown,
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StringSaver &Saver,
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std::function<void(StringRef)> ErrorFn) const;
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/// Render the help text for an option table.
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///
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/// \param OS - The stream to write the help text to.
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/// \param Usage - USAGE: Usage
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/// \param Title - OVERVIEW: Title
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/// \param VisibilityMask - Only in Visibility VisibilityMask,clude options with any of these
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/// visibility flags set.
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/// \param ShowHidden - If true, display options marked as HelpHidden
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/// \param ShowAllAliases - If true, display all options including aliases
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/// that don't have help texts. By default, we display
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/// only options that are not hidden and have help
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/// texts.
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void printHelp(raw_ostream &OS, const char *Usage, const char *Title,
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bool ShowHidden = false, bool ShowAllAliases = false,
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Visibility VisibilityMask = Visibility(),
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StringRef SubCommand = {}) const;
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void printHelp(raw_ostream &OS, const char *Usage, const char *Title,
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unsigned FlagsToInclude, unsigned FlagsToExclude,
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bool ShowAllAliases) const;
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private:
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void internalPrintHelp(raw_ostream &OS, const char *Usage, const char *Title,
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StringRef SubCommand, bool ShowHidden,
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bool ShowAllAliases,
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std::function<bool(const Info &)> ExcludeOption,
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Visibility VisibilityMask) const;
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};
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/// Specialization of OptTable
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class GenericOptTable : public OptTable {
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protected:
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LLVM_ABI GenericOptTable(const StringTable &StrTable,
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ArrayRef<StringTable::Offset> PrefixesTable,
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ArrayRef<Info> OptionInfos, bool IgnoreCase = false,
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ArrayRef<SubCommand> SubCommands = {},
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ArrayRef<unsigned> SubCommandIDsTable = {});
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};
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class PrecomputedOptTable : public OptTable {
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protected:
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PrecomputedOptTable(const StringTable &StrTable,
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ArrayRef<StringTable::Offset> PrefixesTable,
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ArrayRef<Info> OptionInfos,
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ArrayRef<StringTable::Offset> PrefixesUnionOffsets,
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bool IgnoreCase = false,
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ArrayRef<SubCommand> SubCommands = {},
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ArrayRef<unsigned> SubCommandIDsTable = {})
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: OptTable(StrTable, PrefixesTable, OptionInfos, IgnoreCase, SubCommands,
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SubCommandIDsTable) {
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for (auto PrefixOffset : PrefixesUnionOffsets)
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PrefixesUnion.push_back(StrTable[PrefixOffset]);
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buildPrefixChars();
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}
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};
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|
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} // end namespace opt
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|
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} // end namespace llvm
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#define LLVM_MAKE_OPT_ID_WITH_ID_PREFIX( \
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ID_PREFIX, PREFIXES_OFFSET, PREFIXED_NAME_OFFSET, ID, KIND, GROUP, ALIAS, \
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ALIASARGS, FLAGS, VISIBILITY, PARAM, HELPTEXT, HELPTEXTSFORVARIANTS, \
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|
METAVAR, VALUES, SUBCOMMANDIDS_OFFSET) \
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|
ID_PREFIX##ID
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|
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#define LLVM_MAKE_OPT_ID(PREFIXES_OFFSET, PREFIXED_NAME_OFFSET, ID, KIND, \
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|
GROUP, ALIAS, ALIASARGS, FLAGS, VISIBILITY, PARAM, \
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|
HELPTEXT, HELPTEXTSFORVARIANTS, METAVAR, VALUES, \
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|
SUBCOMMANDIDS_OFFSET) \
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|
LLVM_MAKE_OPT_ID_WITH_ID_PREFIX( \
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|
OPT_, PREFIXES_OFFSET, PREFIXED_NAME_OFFSET, ID, KIND, GROUP, ALIAS, \
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|
ALIASARGS, FLAGS, VISIBILITY, PARAM, HELPTEXT, HELPTEXTSFORVARIANTS, \
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|
METAVAR, VALUES, SUBCOMMANDIDS_OFFSET)
|
|
|
|
#define LLVM_CONSTRUCT_OPT_INFO_WITH_ID_PREFIX( \
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|
ID_PREFIX, PREFIXES_OFFSET, PREFIXED_NAME_OFFSET, ID, KIND, GROUP, ALIAS, \
|
|
ALIASARGS, FLAGS, VISIBILITY, PARAM, HELPTEXT, HELPTEXTSFORVARIANTS, \
|
|
METAVAR, VALUES, SUBCOMMANDIDS_OFFSET) \
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|
llvm::opt::OptTable::Info { \
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|
PREFIXES_OFFSET, PREFIXED_NAME_OFFSET, HELPTEXT, HELPTEXTSFORVARIANTS, \
|
|
METAVAR, ID_PREFIX##ID, llvm::opt::Option::KIND##Class, PARAM, FLAGS, \
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|
VISIBILITY, ID_PREFIX##GROUP, ID_PREFIX##ALIAS, ALIASARGS, VALUES, \
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|
SUBCOMMANDIDS_OFFSET \
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|
}
|
|
|
|
#define LLVM_CONSTRUCT_OPT_INFO( \
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|
PREFIXES_OFFSET, PREFIXED_NAME_OFFSET, ID, KIND, GROUP, ALIAS, ALIASARGS, \
|
|
FLAGS, VISIBILITY, PARAM, HELPTEXT, HELPTEXTSFORVARIANTS, METAVAR, VALUES, \
|
|
SUBCOMMANDIDS_OFFSET) \
|
|
LLVM_CONSTRUCT_OPT_INFO_WITH_ID_PREFIX( \
|
|
OPT_, PREFIXES_OFFSET, PREFIXED_NAME_OFFSET, ID, KIND, GROUP, ALIAS, \
|
|
ALIASARGS, FLAGS, VISIBILITY, PARAM, HELPTEXT, HELPTEXTSFORVARIANTS, \
|
|
METAVAR, VALUES, SUBCOMMANDIDS_OFFSET)
|
|
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|
#endif // LLVM_OPTION_OPTTABLE_H
|