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[Frontend] Add -print-supported-features option

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This is a replacement for `-emit-supported-features` that prints
all of the upcoming/experimental features supported by the compiler
with some additional meta information in JSON format to stdout.

(cherry picked from commit 55bd906906)
This commit is contained in:
Pavel Yaskevich
2025-04-14 16:57:11 -07:00
parent e92e9dff0c
commit e477143d58
9 changed files with 153 additions and 0 deletions
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74
lib/Basic/SupportedFeatures.cpp Normal file
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//===--- SupportedFeatures.cpp - Supported features printing --------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include <array>
#include <vector>
#include "swift/Basic/Feature.h"
#include "swift/Frontend/Frontend.h"
#include "llvm/Support/raw_ostream.h"
using namespace swift;
namespace swift {
namespace features {
/// Print information about what features upcoming/experimental are
/// supported by the compiler.
/// The information includes whether a feature is adoptable and for
/// upcoming features - what is the first mode it's introduced.
void printSupportedFeatures(llvm::raw_ostream &out) {
std::array upcoming{
#define LANGUAGE_FEATURE(FeatureName, SENumber, Description)
#define UPCOMING_FEATURE(FeatureName, SENumber, Version) Feature::FeatureName,
#include "swift/Basic/Features.def"
};
std::vector<swift::Feature> experimental{{
#define LANGUAGE_FEATURE(FeatureName, SENumber, Description)
#define EXPERIMENTAL_FEATURE(FeatureName, AvailableInProd) Feature::FeatureName,
#include "swift/Basic/Features.def"
}};
// Include only experimental features that are available in production.
llvm::erase_if(experimental, [](auto &feature) {
return feature.isAvailableInProduction();
});
out << "{\n";
auto printFeature = [&out](const Feature &feature) {
out << " ";
out << "{ \"name\": \"" << feature.getName() << "\"";
if (feature.isAdoptable()) {
out << ", \"migratable\": true";
}
if (auto version = feature.getLanguageVersion()) {
out << ", \"enabled_in\": " << *version;
}
out << " }";
};
out << " \"features\": {\n";
out << " \"upcoming\": [\n";
llvm::interleave(upcoming, printFeature, [&out] { out << ",\n"; });
out << "\n ],\n";
out << " \"experimental\": [\n";
llvm::interleave(experimental, printFeature, [&out] { out << ",\n"; });
out << "\n ]\n";
out << " }\n";
out << "}\n";
}
} // end namespace features
} // end namespace swift