forked from OSchip/llvm-project
270 lines
8.2 KiB
C++
270 lines
8.2 KiB
C++
//===--- Options.cpp - Option info table --------------------------------*-===//
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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 "clang/Driver/Options.h"
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#include "clang/Driver/Arg.h"
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#include "clang/Driver/ArgList.h"
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#include "clang/Driver/Option.h"
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#include <algorithm>
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#include <cassert>
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using namespace clang::driver;
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using namespace clang::driver::options;
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struct Info {
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const char *Name;
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const char *Flags;
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const char *HelpText;
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const char *MetaVar;
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Option::OptionClass Kind;
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unsigned GroupID;
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unsigned AliasID;
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unsigned Param;
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};
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// Ordering on Info. The ordering is *almost* lexicographic, with two
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// exceptions. First, '\0' comes at the end of the alphabet instead of
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// the beginning (thus options preceed any other options which prefix
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// them). Second, for options with the same name, the less permissive
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// version should come first; a Flag option should preceed a Joined
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// option, for example.
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static int StrCmpOptionName(const char *A, const char *B) {
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char a = *A, b = *B;
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while (a == b) {
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if (a == '\0')
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return 0;
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a = *++A;
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b = *++B;
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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 inline bool operator<(const Info &A, const Info &B) {
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if (&A == &B)
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return false;
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if (int N = StrCmpOptionName(A.Name, B.Name))
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return N == -1;
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// Names are the same, check that classes are in order; exactly one
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// should be joined, and it should succeed the other.
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assert(((A.Kind == Option::JoinedClass) ^ (B.Kind == Option::JoinedClass)) &&
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"Unexpected classes for options with same name.");
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return B.Kind == Option::JoinedClass;
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}
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//
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static Info OptionInfos[] = {
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// The InputOption info
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{ "<input>", "d", 0, 0, Option::InputClass, OPT_INVALID, OPT_INVALID, 0 },
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// The UnknownOption info
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{ "<unknown>", "", 0, 0, Option::UnknownClass, OPT_INVALID, OPT_INVALID, 0 },
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#define OPTION(NAME, ID, KIND, GROUP, ALIAS, FLAGS, PARAM, \
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HELPTEXT, METAVAR) \
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{ NAME, FLAGS, HELPTEXT, METAVAR, \
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Option::KIND##Class, OPT_##GROUP, OPT_##ALIAS, PARAM },
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#include "clang/Driver/Options.def"
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};
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static const unsigned numOptions = sizeof(OptionInfos) / sizeof(OptionInfos[0]);
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static Info &getInfo(unsigned id) {
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assert(id > 0 && id - 1 < numOptions && "Invalid Option ID.");
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return OptionInfos[id - 1];
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}
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OptTable::OptTable() : Options(new Option*[numOptions]) {
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// Explicitly zero initialize the error to work around a bug in array
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// value-initialization on MinGW with gcc 4.3.5.
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memset(Options, 0, sizeof(*Options) * numOptions);
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// Find start of normal options.
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FirstSearchableOption = 0;
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for (unsigned i = OPT_UNKNOWN + 1; i < LastOption; ++i) {
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if (getInfo(i).Kind != Option::GroupClass) {
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FirstSearchableOption = i;
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break;
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}
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}
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assert(FirstSearchableOption != 0 && "No searchable options?");
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#ifndef NDEBUG
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// Check that everything after the first searchable option is a
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// regular option class.
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for (unsigned i = FirstSearchableOption; i < LastOption; ++i) {
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Option::OptionClass Kind = getInfo(i).Kind;
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assert((Kind != Option::InputClass && Kind != Option::UnknownClass &&
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Kind != Option::GroupClass) &&
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"Special options should be defined first!");
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}
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// Check that options are in order.
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for (unsigned i = FirstSearchableOption + 1; i < LastOption; ++i) {
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if (!(getInfo(i - 1) < getInfo(i))) {
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getOption((options::ID) (i - 1))->dump();
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getOption((options::ID) i)->dump();
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assert(0 && "Options are not in order!");
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}
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}
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#endif
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}
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OptTable::~OptTable() {
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for (unsigned i = 0; i < numOptions; ++i)
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delete Options[i];
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delete[] Options;
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}
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unsigned OptTable::getNumOptions() const {
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return numOptions;
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}
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const char *OptTable::getOptionName(options::ID id) const {
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return getInfo(id).Name;
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}
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unsigned OptTable::getOptionKind(options::ID id) const {
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return getInfo(id).Kind;
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}
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const char *OptTable::getOptionHelpText(options::ID id) const {
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return getInfo(id).HelpText;
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}
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const char *OptTable::getOptionMetaVar(options::ID id) const {
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return getInfo(id).MetaVar;
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}
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const Option *OptTable::getOption(options::ID id) const {
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if (id == OPT_INVALID)
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return 0;
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assert((unsigned) (id - 1) < numOptions && "Invalid ID.");
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Option *&Entry = Options[id - 1];
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if (!Entry)
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Entry = constructOption(id);
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return Entry;
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}
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Option *OptTable::constructOption(options::ID id) const {
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Info &info = getInfo(id);
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const OptionGroup *Group =
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cast_or_null<OptionGroup>(getOption((options::ID) info.GroupID));
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const Option *Alias = getOption((options::ID) info.AliasID);
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Option *Opt = 0;
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switch (info.Kind) {
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case Option::InputClass:
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Opt = new InputOption(); break;
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case Option::UnknownClass:
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Opt = new UnknownOption(); break;
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case Option::GroupClass:
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Opt = new OptionGroup(id, info.Name, Group); break;
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case Option::FlagClass:
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Opt = new FlagOption(id, info.Name, Group, Alias); break;
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case Option::JoinedClass:
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Opt = new JoinedOption(id, info.Name, Group, Alias); break;
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case Option::SeparateClass:
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Opt = new SeparateOption(id, info.Name, Group, Alias); break;
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case Option::CommaJoinedClass:
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Opt = new CommaJoinedOption(id, info.Name, Group, Alias); break;
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case Option::MultiArgClass:
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Opt = new MultiArgOption(id, info.Name, Group, Alias, info.Param); break;
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case Option::JoinedOrSeparateClass:
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Opt = new JoinedOrSeparateOption(id, info.Name, Group, Alias); break;
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case Option::JoinedAndSeparateClass:
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Opt = new JoinedAndSeparateOption(id, info.Name, Group, Alias); break;
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}
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for (const char *s = info.Flags; *s; ++s) {
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switch (*s) {
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default: assert(0 && "Invalid option flag.");
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case 'J':
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assert(info.Kind == Option::SeparateClass && "Invalid option.");
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Opt->setForceJoinedRender(true); break;
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case 'S':
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assert(info.Kind == Option::JoinedClass && "Invalid option.");
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Opt->setForceSeparateRender(true); break;
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case 'd': Opt->setDriverOption(true); break;
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case 'i': Opt->setNoOptAsInput(true); break;
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case 'l': Opt->setLinkerInput(true); break;
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case 'q': Opt->setNoArgumentUnused(true); break;
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case 'u': Opt->setUnsupported(true); break;
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}
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}
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return Opt;
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}
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// Support lower_bound between info and an option name.
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static inline bool operator<(struct Info &I, const char *Name) {
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return StrCmpOptionName(I.Name, Name) == -1;
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}
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static inline bool operator<(const char *Name, struct Info &I) {
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return StrCmpOptionName(Name, I.Name) == -1;
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}
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Arg *OptTable::ParseOneArg(const InputArgList &Args, unsigned &Index) const {
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unsigned Prev = Index;
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const char *Str = Args.getArgString(Index);
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// Anything that doesn't start with '-' is an input, as is '-' itself.
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if (Str[0] != '-' || Str[1] == '\0')
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return new PositionalArg(getOption(OPT_INPUT), Index++);
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struct Info *Start = OptionInfos + FirstSearchableOption - 1;
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struct Info *End = OptionInfos + LastOption - 1;
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// Search for the first next option which could be a prefix.
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Start = std::lower_bound(Start, End, Str);
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// Options are stored in sorted order, with '\0' at the end of the
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// alphabet. Since the only options which can accept a string must
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// prefix it, we iteratively search for the next option which could
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// be a prefix.
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//
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// FIXME: This is searching much more than necessary, but I am
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// blanking on the simplest way to make it fast. We can solve this
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// problem when we move to TableGen.
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for (; Start != End; ++Start) {
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// Scan for first option which is a proper prefix.
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for (; Start != End; ++Start)
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if (memcmp(Str, Start->Name, strlen(Start->Name)) == 0)
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break;
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if (Start == End)
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break;
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// See if this option matches.
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options::ID id = (options::ID) (Start - OptionInfos + 1);
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if (Arg *A = getOption(id)->accept(Args, Index))
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return A;
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// Otherwise, see if this argument was missing values.
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if (Prev != Index)
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return 0;
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}
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return new PositionalArg(getOption(OPT_UNKNOWN), Index++);
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}
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