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09b8af86fb
Using a virutal output backend to capture all the outputs from swift-frontend invocation. This allows redirecting and/or mirroring compiler outputs to multiple location using different OutputBackend. As an example usage for the virtual outputs, teach swift compiler to check its output determinism by running the compiler invocation twice and compare the hash of all its outputs. Virtual output will be used to enable caching in the future.
59 lines
2.1 KiB
C++
59 lines
2.1 KiB
C++
//===--- FileSystem.h - File helpers that interact with Diags ---*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2018 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_AST_FILESYSTEM_H
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#define SWIFT_AST_FILESYSTEM_H
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#include "swift/Basic/FileSystem.h"
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#include "swift/AST/DiagnosticEngine.h"
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#include "swift/AST/DiagnosticsCommon.h"
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#include "llvm/Support/VirtualOutputBackend.h"
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#include "llvm/Support/VirtualOutputConfig.h"
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namespace swift {
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/// A wrapper around llvm::vfs::OutputBackend to handle diagnosing any file
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/// system errors during output creation.
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///
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/// \returns true if there were any errors, either from the filesystem
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/// operations or from \p action returning true.
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inline bool
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withOutputPath(DiagnosticEngine &diags, llvm::vfs::OutputBackend &Backend,
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StringRef outputPath,
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llvm::function_ref<bool(llvm::raw_pwrite_stream &)> action) {
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assert(!outputPath.empty());
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llvm::vfs::OutputConfig config;
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config.setAtomicWrite().setOnlyIfDifferent();
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auto outputFile = Backend.createFile(outputPath, config);
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if (!outputFile) {
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diags.diagnose(SourceLoc(), diag::error_opening_output, outputPath,
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toString(outputFile.takeError()));
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return true;
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}
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bool failed = action(*outputFile);
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// If there is an error, discard output. Otherwise keep the output file.
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if (auto error = failed ? outputFile->discard() : outputFile->keep()) {
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// Don't diagnose discard error.
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if (failed)
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consumeError(std::move(error));
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else
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diags.diagnose(SourceLoc(), diag::error_closing_output, outputPath,
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toString(std::move(error)));
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return true;
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}
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return failed;
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}
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} // end namespace swift
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#endif // SWIFT_AST_FILESYSTEM_H
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