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c68fbdca33
If the user passes a flag like `-version` to a program, it's more likely they mean `--version` than `-version:`, since there's no parameter passed. Hence, give delimited arguments a penalty of 1 if the user input doesn't contain the delimiter or no data after it. The motivation is that with this, lld-link can suggest "--version" instead of "-version:" for "-version" and "-nodefaultlib" instead of "-nodefaultlib:" for "-nodefaultlibs". Differential Revision: https://reviews.llvm.org/D61382 llvm-svn: 359701
584 lines
19 KiB
C++
584 lines
19 KiB
C++
//===- OptTable.cpp - Option Table Implementation -------------------------===//
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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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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/StringSet.h"
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#include "llvm/Option/Arg.h"
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#include "llvm/Option/ArgList.h"
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#include "llvm/Option/Option.h"
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#include "llvm/Option/OptSpecifier.h"
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#include "llvm/Option/OptTable.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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#include <cassert>
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#include <cctype>
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#include <cstring>
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#include <map>
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#include <string>
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#include <utility>
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#include <vector>
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using namespace llvm;
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using namespace llvm::opt;
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namespace llvm {
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namespace opt {
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// Ordering on Info. The ordering is *almost* case-insensitive lexicographic,
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// with an exception. '\0' comes at the end of the alphabet instead of the
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// beginning (thus options precede any other options which prefix them).
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static int StrCmpOptionNameIgnoreCase(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 0;
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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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#ifndef NDEBUG
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static int StrCmpOptionName(const char *A, const char *B) {
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if (int N = StrCmpOptionNameIgnoreCase(A, B))
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return N;
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return strcmp(A, B);
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}
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static inline bool operator<(const OptTable::Info &A, const OptTable::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 < 0;
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for (const char * const *APre = A.Prefixes,
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* const *BPre = B.Prefixes;
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*APre != nullptr && *BPre != nullptr; ++APre, ++BPre){
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if (int N = StrCmpOptionName(*APre, *BPre))
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return N < 0;
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}
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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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#endif
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// Support lower_bound between info and an option name.
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static inline bool operator<(const OptTable::Info &I, const char *Name) {
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return StrCmpOptionNameIgnoreCase(I.Name, Name) < 0;
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}
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} // end namespace opt
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} // end namespace llvm
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OptSpecifier::OptSpecifier(const Option *Opt) : ID(Opt->getID()) {}
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OptTable::OptTable(ArrayRef<Info> OptionInfos, bool IgnoreCase)
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: OptionInfos(OptionInfos), IgnoreCase(IgnoreCase) {
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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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// Find start of normal options.
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for (unsigned i = 0, e = getNumOptions(); i != e; ++i) {
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unsigned Kind = getInfo(i + 1).Kind;
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if (Kind == Option::InputClass) {
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assert(!TheInputOptionID && "Cannot have multiple input options!");
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TheInputOptionID = getInfo(i + 1).ID;
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} else if (Kind == Option::UnknownClass) {
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assert(!TheUnknownOptionID && "Cannot have multiple unknown options!");
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TheUnknownOptionID = getInfo(i + 1).ID;
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} else if (Kind != Option::GroupClass) {
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FirstSearchableIndex = i;
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break;
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}
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}
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assert(FirstSearchableIndex != 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 = FirstSearchableIndex, e = getNumOptions(); i != e; ++i) {
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Option::OptionClass Kind = (Option::OptionClass) getInfo(i + 1).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 = FirstSearchableIndex + 1, e = getNumOptions(); i != e; ++i){
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if (!(getInfo(i) < getInfo(i + 1))) {
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getOption(i).dump();
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getOption(i + 1).dump();
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llvm_unreachable("Options are not in order!");
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}
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}
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#endif
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// Build prefixes.
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for (unsigned i = FirstSearchableIndex + 1, e = getNumOptions() + 1;
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i != e; ++i) {
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if (const char *const *P = getInfo(i).Prefixes) {
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for (; *P != nullptr; ++P) {
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PrefixesUnion.insert(*P);
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}
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}
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}
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// Build prefix chars.
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for (StringSet<>::const_iterator I = PrefixesUnion.begin(),
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E = PrefixesUnion.end(); I != E; ++I) {
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StringRef Prefix = I->getKey();
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for (StringRef::const_iterator C = Prefix.begin(), CE = Prefix.end();
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C != CE; ++C)
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if (!is_contained(PrefixChars, *C))
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PrefixChars.push_back(*C);
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}
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}
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OptTable::~OptTable() = default;
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const Option OptTable::getOption(OptSpecifier Opt) const {
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unsigned id = Opt.getID();
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if (id == 0)
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return Option(nullptr, nullptr);
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assert((unsigned) (id - 1) < getNumOptions() && "Invalid ID.");
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return Option(&getInfo(id), this);
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}
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static bool isInput(const StringSet<> &Prefixes, StringRef Arg) {
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if (Arg == "-")
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return true;
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for (StringSet<>::const_iterator I = Prefixes.begin(),
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E = Prefixes.end(); I != E; ++I)
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if (Arg.startswith(I->getKey()))
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return false;
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return true;
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}
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/// \returns Matched size. 0 means no match.
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static unsigned matchOption(const OptTable::Info *I, StringRef Str,
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bool IgnoreCase) {
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for (const char * const *Pre = I->Prefixes; *Pre != nullptr; ++Pre) {
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StringRef Prefix(*Pre);
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if (Str.startswith(Prefix)) {
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StringRef Rest = Str.substr(Prefix.size());
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bool Matched = IgnoreCase
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? Rest.startswith_lower(I->Name)
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: Rest.startswith(I->Name);
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if (Matched)
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return Prefix.size() + StringRef(I->Name).size();
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}
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}
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return 0;
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}
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// Returns true if one of the Prefixes + In.Names matches Option
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static bool optionMatches(const OptTable::Info &In, StringRef Option) {
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if (In.Prefixes)
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for (size_t I = 0; In.Prefixes[I]; I++)
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if (Option == std::string(In.Prefixes[I]) + In.Name)
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return true;
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return false;
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}
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// This function is for flag value completion.
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// Eg. When "-stdlib=" and "l" was passed to this function, it will return
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// appropiriate values for stdlib, which starts with l.
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std::vector<std::string>
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OptTable::suggestValueCompletions(StringRef Option, StringRef Arg) const {
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// Search all options and return possible values.
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for (size_t I = FirstSearchableIndex, E = OptionInfos.size(); I < E; I++) {
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const Info &In = OptionInfos[I];
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if (!In.Values || !optionMatches(In, Option))
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continue;
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SmallVector<StringRef, 8> Candidates;
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StringRef(In.Values).split(Candidates, ",", -1, false);
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std::vector<std::string> Result;
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for (StringRef Val : Candidates)
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if (Val.startswith(Arg) && Arg.compare(Val))
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Result.push_back(Val);
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return Result;
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}
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return {};
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}
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std::vector<std::string>
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OptTable::findByPrefix(StringRef Cur, unsigned short DisableFlags) const {
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std::vector<std::string> Ret;
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for (size_t I = FirstSearchableIndex, E = OptionInfos.size(); I < E; I++) {
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const Info &In = OptionInfos[I];
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if (!In.Prefixes || (!In.HelpText && !In.GroupID))
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continue;
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if (In.Flags & DisableFlags)
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continue;
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for (int I = 0; In.Prefixes[I]; I++) {
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std::string S = std::string(In.Prefixes[I]) + std::string(In.Name) + "\t";
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if (In.HelpText)
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S += In.HelpText;
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if (StringRef(S).startswith(Cur) && S.compare(std::string(Cur) + "\t"))
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Ret.push_back(S);
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}
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}
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return Ret;
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}
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unsigned OptTable::findNearest(StringRef Option, std::string &NearestString,
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unsigned FlagsToInclude, unsigned FlagsToExclude,
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unsigned MinimumLength) const {
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assert(!Option.empty());
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// Consider each [option prefix + option name] pair as a candidate, finding
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// the closest match.
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unsigned BestDistance = UINT_MAX;
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for (const Info &CandidateInfo :
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ArrayRef<Info>(OptionInfos).drop_front(FirstSearchableIndex)) {
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StringRef CandidateName = CandidateInfo.Name;
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// We can eliminate some option prefix/name pairs as candidates right away:
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// * Ignore option candidates with empty names, such as "--", or names
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// that do not meet the minimum length.
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if (CandidateName.empty() || CandidateName.size() < MinimumLength)
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continue;
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// * If FlagsToInclude were specified, ignore options that don't include
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// those flags.
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if (FlagsToInclude && !(CandidateInfo.Flags & FlagsToInclude))
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continue;
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// * Ignore options that contain the FlagsToExclude.
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if (CandidateInfo.Flags & FlagsToExclude)
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continue;
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// * Ignore positional argument option candidates (which do not
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// have prefixes).
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if (!CandidateInfo.Prefixes)
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continue;
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// Now check if the candidate ends with a character commonly used when
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// delimiting an option from its value, such as '=' or ':'. If it does,
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// attempt to split the given option based on that delimiter.
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StringRef LHS, RHS;
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char Last = CandidateName.back();
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bool CandidateHasDelimiter = Last == '=' || Last == ':';
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std::string NormalizedName = Option;
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if (CandidateHasDelimiter) {
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std::tie(LHS, RHS) = Option.split(Last);
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NormalizedName = LHS;
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if (Option.find(Last) == LHS.size())
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NormalizedName += Last;
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}
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// Consider each possible prefix for each candidate to find the most
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// appropriate one. For example, if a user asks for "--helm", suggest
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// "--help" over "-help".
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for (int P = 0;
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const char *const CandidatePrefix = CandidateInfo.Prefixes[P]; P++) {
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std::string Candidate = (CandidatePrefix + CandidateName).str();
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StringRef CandidateRef = Candidate;
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unsigned Distance =
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CandidateRef.edit_distance(NormalizedName, /*AllowReplacements=*/true,
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/*MaxEditDistance=*/BestDistance);
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if (RHS.empty() && CandidateHasDelimiter) {
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// The Candidate ends with a = or : delimiter, but the option passed in
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// didn't contain the delimiter (or doesn't have anything after it).
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// In that case, penalize the correction: `-nodefaultlibs` is more
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// likely to be a spello for `-nodefaultlib` than `-nodefaultlib:` even
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// though both have an unmodified editing distance of 1, since the
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// latter would need an argument.
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++Distance;
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}
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if (Distance < BestDistance) {
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BestDistance = Distance;
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NearestString = (Candidate + RHS).str();
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}
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}
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}
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return BestDistance;
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}
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bool OptTable::addValues(const char *Option, const char *Values) {
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for (size_t I = FirstSearchableIndex, E = OptionInfos.size(); I < E; I++) {
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Info &In = OptionInfos[I];
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if (optionMatches(In, Option)) {
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In.Values = Values;
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return true;
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}
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}
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return false;
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}
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Arg *OptTable::ParseOneArg(const ArgList &Args, unsigned &Index,
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unsigned FlagsToInclude,
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unsigned FlagsToExclude) 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 PrefixesUnion is an input, as is '-'
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// itself.
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if (isInput(PrefixesUnion, Str))
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return new Arg(getOption(TheInputOptionID), Str, Index++, Str);
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const Info *Start = OptionInfos.data() + FirstSearchableIndex;
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const Info *End = OptionInfos.data() + OptionInfos.size();
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StringRef Name = StringRef(Str).ltrim(PrefixChars);
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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, Name.data());
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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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unsigned ArgSize = 0;
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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 ((ArgSize = matchOption(Start, Str, IgnoreCase)))
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break;
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if (Start == End)
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break;
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Option Opt(Start, this);
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if (FlagsToInclude && !Opt.hasFlag(FlagsToInclude))
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continue;
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if (Opt.hasFlag(FlagsToExclude))
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continue;
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// See if this option matches.
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if (Arg *A = Opt.accept(Args, Index, ArgSize))
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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 nullptr;
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}
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// If we failed to find an option and this arg started with /, then it's
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// probably an input path.
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if (Str[0] == '/')
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return new Arg(getOption(TheInputOptionID), Str, Index++, Str);
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return new Arg(getOption(TheUnknownOptionID), Str, Index++, Str);
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}
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InputArgList OptTable::ParseArgs(ArrayRef<const char *> ArgArr,
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unsigned &MissingArgIndex,
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unsigned &MissingArgCount,
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unsigned FlagsToInclude,
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unsigned FlagsToExclude) const {
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InputArgList Args(ArgArr.begin(), ArgArr.end());
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// FIXME: Handle '@' args (or at least error on them).
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MissingArgIndex = MissingArgCount = 0;
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unsigned Index = 0, End = ArgArr.size();
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while (Index < End) {
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// Ingore nullptrs, they are response file's EOL markers
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if (Args.getArgString(Index) == nullptr) {
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++Index;
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continue;
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}
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// Ignore empty arguments (other things may still take them as arguments).
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StringRef Str = Args.getArgString(Index);
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if (Str == "") {
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++Index;
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continue;
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}
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unsigned Prev = Index;
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Arg *A = ParseOneArg(Args, Index, FlagsToInclude, FlagsToExclude);
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assert(Index > Prev && "Parser failed to consume argument.");
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// Check for missing argument error.
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if (!A) {
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assert(Index >= End && "Unexpected parser error.");
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assert(Index - Prev - 1 && "No missing arguments!");
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MissingArgIndex = Prev;
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MissingArgCount = Index - Prev - 1;
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break;
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}
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Args.append(A);
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}
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return Args;
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}
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static std::string getOptionHelpName(const OptTable &Opts, OptSpecifier Id) {
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const Option O = Opts.getOption(Id);
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std::string Name = O.getPrefixedName();
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// Add metavar, if used.
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switch (O.getKind()) {
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case Option::GroupClass: case Option::InputClass: case Option::UnknownClass:
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llvm_unreachable("Invalid option with help text.");
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case Option::MultiArgClass:
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if (const char *MetaVarName = Opts.getOptionMetaVar(Id)) {
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// For MultiArgs, metavar is full list of all argument names.
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Name += ' ';
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Name += MetaVarName;
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}
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else {
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// For MultiArgs<N>, if metavar not supplied, print <value> N times.
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for (unsigned i=0, e=O.getNumArgs(); i< e; ++i) {
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Name += " <value>";
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}
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}
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break;
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case Option::FlagClass:
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break;
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case Option::ValuesClass:
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break;
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case Option::SeparateClass: case Option::JoinedOrSeparateClass:
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case Option::RemainingArgsClass: case Option::RemainingArgsJoinedClass:
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Name += ' ';
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LLVM_FALLTHROUGH;
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case Option::JoinedClass: case Option::CommaJoinedClass:
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case Option::JoinedAndSeparateClass:
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if (const char *MetaVarName = Opts.getOptionMetaVar(Id))
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Name += MetaVarName;
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else
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Name += "<value>";
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break;
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}
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return Name;
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}
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namespace {
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struct OptionInfo {
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std::string Name;
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StringRef HelpText;
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};
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} // namespace
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static void PrintHelpOptionList(raw_ostream &OS, StringRef Title,
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std::vector<OptionInfo> &OptionHelp) {
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OS << Title << ":\n";
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// Find the maximum option length.
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unsigned OptionFieldWidth = 0;
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for (unsigned i = 0, e = OptionHelp.size(); i != e; ++i) {
|
|
// Limit the amount of padding we are willing to give up for alignment.
|
|
unsigned Length = OptionHelp[i].Name.size();
|
|
if (Length <= 23)
|
|
OptionFieldWidth = std::max(OptionFieldWidth, Length);
|
|
}
|
|
|
|
const unsigned InitialPad = 2;
|
|
for (unsigned i = 0, e = OptionHelp.size(); i != e; ++i) {
|
|
const std::string &Option = OptionHelp[i].Name;
|
|
int Pad = OptionFieldWidth - int(Option.size());
|
|
OS.indent(InitialPad) << Option;
|
|
|
|
// Break on long option names.
|
|
if (Pad < 0) {
|
|
OS << "\n";
|
|
Pad = OptionFieldWidth + InitialPad;
|
|
}
|
|
OS.indent(Pad + 1) << OptionHelp[i].HelpText << '\n';
|
|
}
|
|
}
|
|
|
|
static const char *getOptionHelpGroup(const OptTable &Opts, OptSpecifier Id) {
|
|
unsigned GroupID = Opts.getOptionGroupID(Id);
|
|
|
|
// If not in a group, return the default help group.
|
|
if (!GroupID)
|
|
return "OPTIONS";
|
|
|
|
// Abuse the help text of the option groups to store the "help group"
|
|
// name.
|
|
//
|
|
// FIXME: Split out option groups.
|
|
if (const char *GroupHelp = Opts.getOptionHelpText(GroupID))
|
|
return GroupHelp;
|
|
|
|
// Otherwise keep looking.
|
|
return getOptionHelpGroup(Opts, GroupID);
|
|
}
|
|
|
|
void OptTable::PrintHelp(raw_ostream &OS, const char *Usage, const char *Title,
|
|
bool ShowHidden, bool ShowAllAliases) const {
|
|
PrintHelp(OS, Usage, Title, /*Include*/ 0, /*Exclude*/
|
|
(ShowHidden ? 0 : HelpHidden), ShowAllAliases);
|
|
}
|
|
|
|
void OptTable::PrintHelp(raw_ostream &OS, const char *Usage, const char *Title,
|
|
unsigned FlagsToInclude, unsigned FlagsToExclude,
|
|
bool ShowAllAliases) const {
|
|
OS << "OVERVIEW: " << Title << "\n\n";
|
|
OS << "USAGE: " << Usage << "\n\n";
|
|
|
|
// Render help text into a map of group-name to a list of (option, help)
|
|
// pairs.
|
|
std::map<std::string, std::vector<OptionInfo>> GroupedOptionHelp;
|
|
|
|
for (unsigned Id = 1, e = getNumOptions() + 1; Id != e; ++Id) {
|
|
// FIXME: Split out option groups.
|
|
if (getOptionKind(Id) == Option::GroupClass)
|
|
continue;
|
|
|
|
unsigned Flags = getInfo(Id).Flags;
|
|
if (FlagsToInclude && !(Flags & FlagsToInclude))
|
|
continue;
|
|
if (Flags & FlagsToExclude)
|
|
continue;
|
|
|
|
// If an alias doesn't have a help text, show a help text for the aliased
|
|
// option instead.
|
|
const char *HelpText = getOptionHelpText(Id);
|
|
if (!HelpText && ShowAllAliases) {
|
|
const Option Alias = getOption(Id).getAlias();
|
|
if (Alias.isValid())
|
|
HelpText = getOptionHelpText(Alias.getID());
|
|
}
|
|
|
|
if (HelpText) {
|
|
const char *HelpGroup = getOptionHelpGroup(*this, Id);
|
|
const std::string &OptName = getOptionHelpName(*this, Id);
|
|
GroupedOptionHelp[HelpGroup].push_back({OptName, HelpText});
|
|
}
|
|
}
|
|
|
|
for (auto& OptionGroup : GroupedOptionHelp) {
|
|
if (OptionGroup.first != GroupedOptionHelp.begin()->first)
|
|
OS << "\n";
|
|
PrintHelpOptionList(OS, OptionGroup.first, OptionGroup.second);
|
|
}
|
|
|
|
OS.flush();
|
|
}
|