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//===-- lib/Common/Fortran-features.cpp -----------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "flang/Common/Fortran-features.h"
#include "flang/Common/Fortran.h"
#include "flang/Common/idioms.h"
namespace Fortran::common {
LanguageFeatureControl::LanguageFeatureControl() {
// These features must be explicitly enabled by command line options.
disable_.set(LanguageFeature::OldDebugLines);
disable_.set(LanguageFeature::OpenACC);
disable_.set(LanguageFeature::OpenMP);
disable_.set(LanguageFeature::CUDA); // !@cuf
disable_.set(LanguageFeature::CudaManaged);
disable_.set(LanguageFeature::CudaUnified);
disable_.set(LanguageFeature::ImplicitNoneTypeNever);
disable_.set(LanguageFeature::ImplicitNoneTypeAlways);
disable_.set(LanguageFeature::DefaultSave);
disable_.set(LanguageFeature::SaveMainProgram);
// These features, if enabled, conflict with valid standard usage,
// so there are disabled here by default.
disable_.set(LanguageFeature::BackslashEscapes);
disable_.set(LanguageFeature::LogicalAbbreviations);
disable_.set(LanguageFeature::XOROperator);
disable_.set(LanguageFeature::OldStyleParameter);
// Possibly an accidental "feature" of nvfortran.
disable_.set(LanguageFeature::AssumedRankPassedToNonAssumedRank);
// These warnings are enabled by default, but only because they used
// to be unconditional. TODO: prune this list
warnLanguage_.set(LanguageFeature::ExponentMatchingKindParam);
warnLanguage_.set(LanguageFeature::RedundantAttribute);
warnLanguage_.set(LanguageFeature::SubroutineAndFunctionSpecifics);
warnLanguage_.set(LanguageFeature::EmptySequenceType);
warnLanguage_.set(LanguageFeature::NonSequenceCrayPointee);
warnLanguage_.set(LanguageFeature::BranchIntoConstruct);
warnLanguage_.set(LanguageFeature::BadBranchTarget);
warnLanguage_.set(LanguageFeature::HollerithPolymorphic);
warnLanguage_.set(LanguageFeature::ListDirectedSize);
warnLanguage_.set(LanguageFeature::IgnoreIrrelevantAttributes);
warnUsage_.set(UsageWarning::ShortArrayActual);
warnUsage_.set(UsageWarning::FoldingException);
warnUsage_.set(UsageWarning::FoldingAvoidsRuntimeCrash);
warnUsage_.set(UsageWarning::FoldingValueChecks);
warnUsage_.set(UsageWarning::FoldingFailure);
warnUsage_.set(UsageWarning::FoldingLimit);
warnUsage_.set(UsageWarning::Interoperability);
// CharacterInteroperability warnings about length are off by default
warnUsage_.set(UsageWarning::Bounds);
warnUsage_.set(UsageWarning::Preprocessing);
warnUsage_.set(UsageWarning::Scanning);
warnUsage_.set(UsageWarning::OpenAccUsage);
warnUsage_.set(UsageWarning::ProcPointerCompatibility);
warnUsage_.set(UsageWarning::VoidMold);
warnUsage_.set(UsageWarning::KnownBadImplicitInterface);
warnUsage_.set(UsageWarning::EmptyCase);
warnUsage_.set(UsageWarning::CaseOverflow);
warnUsage_.set(UsageWarning::CUDAUsage);
warnUsage_.set(UsageWarning::IgnoreTKRUsage);
warnUsage_.set(UsageWarning::ExternalInterfaceMismatch);
warnUsage_.set(UsageWarning::DefinedOperatorArgs);
warnUsage_.set(UsageWarning::Final);
warnUsage_.set(UsageWarning::ZeroDoStep);
warnUsage_.set(UsageWarning::UnusedForallIndex);
warnUsage_.set(UsageWarning::OpenMPUsage);
warnUsage_.set(UsageWarning::DataLength);
warnUsage_.set(UsageWarning::IgnoredDirective);
warnUsage_.set(UsageWarning::HomonymousSpecific);
warnUsage_.set(UsageWarning::HomonymousResult);
warnUsage_.set(UsageWarning::IgnoredIntrinsicFunctionType);
warnUsage_.set(UsageWarning::PreviousScalarUse);
warnUsage_.set(UsageWarning::RedeclaredInaccessibleComponent);
warnUsage_.set(UsageWarning::ImplicitShared);
warnUsage_.set(UsageWarning::IndexVarRedefinition);
warnUsage_.set(UsageWarning::IncompatibleImplicitInterfaces);
warnUsage_.set(UsageWarning::BadTypeForTarget);
warnUsage_.set(UsageWarning::VectorSubscriptFinalization);
warnUsage_.set(UsageWarning::UndefinedFunctionResult);
warnUsage_.set(UsageWarning::UselessIomsg);
warnUsage_.set(UsageWarning::UnsignedLiteralTruncation);
// New warnings, on by default
warnLanguage_.set(LanguageFeature::SavedLocalInSpecExpr);
}
// Ignore case and any inserted punctuation (like '-'/'_')
static std::optional<char> GetWarningChar(char ch) {
if (ch >= 'a' && ch <= 'z') {
return ch;
} else if (ch >= 'A' && ch <= 'Z') {
return ch - 'A' + 'a';
} else if (ch >= '0' && ch <= '9') {
return ch;
} else {
return std::nullopt;
}
}
static bool WarningNameMatch(const char *a, const char *b) {
while (true) {
auto ach{GetWarningChar(*a)};
while (!ach && *a) {
ach = GetWarningChar(*++a);
}
auto bch{GetWarningChar(*b)};
while (!bch && *b) {
bch = GetWarningChar(*++b);
}
if (!ach && !bch) {
return true;
} else if (!ach || !bch || *ach != *bch) {
return false;
}
++a, ++b;
}
}
template <typename ENUM, std::size_t N>
std::optional<ENUM> ScanEnum(const char *name) {
if (name) {
for (std::size_t j{0}; j < N; ++j) {
auto feature{static_cast<ENUM>(j)};
if (WarningNameMatch(name, EnumToString(feature).data())) {
return feature;
}
}
}
return std::nullopt;
}
std::optional<LanguageFeature> FindLanguageFeature(const char *name) {
return ScanEnum<LanguageFeature, LanguageFeature_enumSize>(name);
}
std::optional<UsageWarning> FindUsageWarning(const char *name) {
return ScanEnum<UsageWarning, UsageWarning_enumSize>(name);
}
std::vector<const char *> LanguageFeatureControl::GetNames(
LogicalOperator opr) const {
std::vector<const char *> result;
result.push_back(AsFortran(opr));
if (opr == LogicalOperator::Neqv && IsEnabled(LanguageFeature::XOROperator)) {
result.push_back(".xor.");
}
if (IsEnabled(LanguageFeature::LogicalAbbreviations)) {
switch (opr) {
SWITCH_COVERS_ALL_CASES
case LogicalOperator::And:
result.push_back(".a.");
break;
case LogicalOperator::Or:
result.push_back(".o.");
break;
case LogicalOperator::Not:
result.push_back(".n.");
break;
case LogicalOperator::Neqv:
if (IsEnabled(LanguageFeature::XOROperator)) {
result.push_back(".x.");
}
break;
case LogicalOperator::Eqv:
break;
}
}
return result;
}
std::vector<const char *> LanguageFeatureControl::GetNames(
RelationalOperator opr) const {
switch (opr) {
SWITCH_COVERS_ALL_CASES
case RelationalOperator::LT:
return {".lt.", "<"};
case RelationalOperator::LE:
return {".le.", "<="};
case RelationalOperator::EQ:
return {".eq.", "=="};
case RelationalOperator::GE:
return {".ge.", ">="};
case RelationalOperator::GT:
return {".gt.", ">"};
case RelationalOperator::NE:
if (IsEnabled(LanguageFeature::AlternativeNE)) {
return {".ne.", "/=", "<>"};
} else {
return {".ne.", "/="};
}
}
}
} // namespace Fortran::common
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