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Emitting Swift diagnostics in Clang buffers requires making those buffers valid places to put Swift SourceLocs, which means making a mirror of those buffers in the Swift SourceManager. This isn't a copy; instead, any Clang SourceManagers that are involved are kept alive until the importer is torn down. (There might be more than one because of diagnostics emitted during module building.) For a long time we only emitted diagnostics in Clang buffers if the diagnostics came from Clang, but then we added another case for custom Swift names that fail to import. I'm about to add another such diagnostic, so let's formalize this buffer mapping first. No intended functionality change.
65 lines
2.1 KiB
C++
65 lines
2.1 KiB
C++
//===--- ClangSourceBufferImporter.h - Map Clang buffers over ---*- 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 - 2019 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_CLANGIMPORTER_CLANGSOURCEBUFFERIMPORTER_H
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#define SWIFT_CLANGIMPORTER_CLANGSOURCEBUFFERIMPORTER_H
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#include "swift/Basic/LLVM.h"
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#include "swift/Basic/SourceLoc.h"
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#include "clang/Basic/SourceLocation.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/IntrusiveRefCntPtr.h"
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#include "llvm/ADT/SmallVector.h"
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namespace llvm {
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class MemoryBuffer;
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}
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namespace clang {
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class SourceManager;
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}
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namespace swift {
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class SourceManager;
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namespace importer {
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/// A helper class used to keep alive the Clang source managers where
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/// diagnostics have been reported.
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///
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/// This is a bit of a hack, but LLVM's source manager (and by extension
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/// Swift's) does not support buffers going away, so if we want to report
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/// diagnostics in them we have to do it this way.
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class ClangSourceBufferImporter {
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// This is not using SmallPtrSet or similar because we need the
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// IntrusiveRefCntPtr to stay a ref-counting pointer.
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SmallVector<llvm::IntrusiveRefCntPtr<const clang::SourceManager>, 4>
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sourceManagersWithDiagnostics;
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llvm::DenseMap<const llvm::MemoryBuffer *, unsigned> mirroredBuffers;
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SourceManager &swiftSourceManager;
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public:
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explicit ClangSourceBufferImporter(SourceManager &sourceMgr)
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: swiftSourceManager(sourceMgr) {}
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/// Returns a Swift source location that points into a Clang buffer.
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///
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/// This will keep the Clang buffer alive as long as this object.
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SourceLoc resolveSourceLocation(const clang::SourceManager &clangSrcMgr,
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clang::SourceLocation clangLoc);
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};
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} // end namespace importer
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} // end namespace swift
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#endif
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