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//===--- Option.cpp - Abstract Driver Options -----------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/Option/Option.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Option/Arg.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cassert>
using namespace llvm;
using namespace llvm::opt;
Option::Option(const OptTable::Info *info, const OptTable *owner)
: Info(info), Owner(owner) {
// Multi-level aliases are not supported. This just simplifies option
// tracking, it is not an inherent limitation.
assert((!Info || !getAlias().isValid() || !getAlias().getAlias().isValid()) &&
"Multi-level aliases are not supported.");
if (Info && getAliasArgs()) {
assert(getAlias().isValid() && "Only alias options can have alias args.");
assert(getKind() == FlagClass && "Only Flag aliases can have alias args.");
assert(getAlias().getKind() != FlagClass &&
"Cannot provide alias args to a flag option.");
}
}
void Option::dump() const {
llvm::errs() << "<";
switch (getKind()) {
#define P(N) case N: llvm::errs() << #N; break
P(GroupClass);
P(InputClass);
P(UnknownClass);
P(FlagClass);
P(JoinedClass);
P(SeparateClass);
P(CommaJoinedClass);
P(MultiArgClass);
P(JoinedOrSeparateClass);
P(JoinedAndSeparateClass);
P(RemainingArgsClass);
#undef P
}
if (Info->Prefixes) {
llvm::errs() << " Prefixes:[";
for (const char * const *Pre = Info->Prefixes; *Pre != nullptr; ++Pre) {
llvm::errs() << '"' << *Pre << (*(Pre + 1) == nullptr ? "\"" : "\", ");
}
llvm::errs() << ']';
}
llvm::errs() << " Name:\"" << getName() << '"';
const Option Group = getGroup();
if (Group.isValid()) {
llvm::errs() << " Group:";
Group.dump();
}
const Option Alias = getAlias();
if (Alias.isValid()) {
llvm::errs() << " Alias:";
Alias.dump();
}
if (getKind() == MultiArgClass)
llvm::errs() << " NumArgs:" << getNumArgs();
llvm::errs() << ">\n";
}
bool Option::matches(OptSpecifier Opt) const {
// Aliases are never considered in matching, look through them.
const Option Alias = getAlias();
if (Alias.isValid())
return Alias.matches(Opt);
// Check exact match.
if (getID() == Opt.getID())
return true;
const Option Group = getGroup();
if (Group.isValid())
return Group.matches(Opt);
return false;
}
Arg *Option::accept(const ArgList &Args,
unsigned &Index,
unsigned ArgSize) const {
const Option &UnaliasedOption = getUnaliasedOption();
StringRef Spelling;
// If the option was an alias, get the spelling from the unaliased one.
if (getID() == UnaliasedOption.getID()) {
Spelling = StringRef(Args.getArgString(Index), ArgSize);
} else {
Spelling = Args.MakeArgString(Twine(UnaliasedOption.getPrefix()) +
Twine(UnaliasedOption.getName()));
}
switch (getKind()) {
case FlagClass: {
if (ArgSize != strlen(Args.getArgString(Index)))
return nullptr;
Arg *A = new Arg(UnaliasedOption, Spelling, Index++);
if (getAliasArgs()) {
const char *Val = getAliasArgs();
while (*Val != '\0') {
A->getValues().push_back(Val);
// Move past the '\0' to the next argument.
Val += strlen(Val) + 1;
}
}
if (UnaliasedOption.getKind() == JoinedClass && !getAliasArgs())
// A Flag alias for a Joined option must provide an argument.
A->getValues().push_back("");
return A;
}
case JoinedClass: {
const char *Value = Args.getArgString(Index) + ArgSize;
return new Arg(UnaliasedOption, Spelling, Index++, Value);
}
case CommaJoinedClass: {
// Always matches.
const char *Str = Args.getArgString(Index) + ArgSize;
Arg *A = new Arg(UnaliasedOption, Spelling, Index++);
// Parse out the comma separated values.
const char *Prev = Str;
for (;; ++Str) {
char c = *Str;
if (!c || c == ',') {
if (Prev != Str) {
char *Value = new char[Str - Prev + 1];
memcpy(Value, Prev, Str - Prev);
Value[Str - Prev] = '\0';
A->getValues().push_back(Value);
}
if (!c)
break;
Prev = Str + 1;
}
}
A->setOwnsValues(true);
return A;
}
case SeparateClass:
// Matches iff this is an exact match.
// FIXME: Avoid strlen.
if (ArgSize != strlen(Args.getArgString(Index)))
return nullptr;
Index += 2;
if (Index > Args.getNumInputArgStrings() ||
Args.getArgString(Index - 1) == nullptr)
return nullptr;
return new Arg(UnaliasedOption, Spelling,
Index - 2, Args.getArgString(Index - 1));
case MultiArgClass: {
// Matches iff this is an exact match.
// FIXME: Avoid strlen.
if (ArgSize != strlen(Args.getArgString(Index)))
return nullptr;
Index += 1 + getNumArgs();
if (Index > Args.getNumInputArgStrings())
return nullptr;
Arg *A = new Arg(UnaliasedOption, Spelling, Index - 1 - getNumArgs(),
Args.getArgString(Index - getNumArgs()));
for (unsigned i = 1; i != getNumArgs(); ++i)
A->getValues().push_back(Args.getArgString(Index - getNumArgs() + i));
return A;
}
case JoinedOrSeparateClass: {
// If this is not an exact match, it is a joined arg.
// FIXME: Avoid strlen.
if (ArgSize != strlen(Args.getArgString(Index))) {
const char *Value = Args.getArgString(Index) + ArgSize;
return new Arg(*this, Spelling, Index++, Value);
}
// Otherwise it must be separate.
Index += 2;
if (Index > Args.getNumInputArgStrings() ||
Args.getArgString(Index - 1) == nullptr)
return nullptr;
return new Arg(UnaliasedOption, Spelling,
Index - 2, Args.getArgString(Index - 1));
}
case JoinedAndSeparateClass:
// Always matches.
Index += 2;
if (Index > Args.getNumInputArgStrings() ||
Args.getArgString(Index - 1) == nullptr)
return nullptr;
return new Arg(UnaliasedOption, Spelling, Index - 2,
Args.getArgString(Index - 2) + ArgSize,
Args.getArgString(Index - 1));
case RemainingArgsClass: {
// Matches iff this is an exact match.
// FIXME: Avoid strlen.
if (ArgSize != strlen(Args.getArgString(Index)))
return nullptr;
Arg *A = new Arg(UnaliasedOption, Spelling, Index++);
while (Index < Args.getNumInputArgStrings() &&
Args.getArgString(Index) != nullptr)
A->getValues().push_back(Args.getArgString(Index++));
return A;
}
default:
llvm_unreachable("Invalid option kind!");
}
}
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