69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
//===--- LayoutOverrideSource.h --Override Record Layouts -------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_FRONTEND_LAYOUTOVERRIDESOURCE_H
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#define LLVM_CLANG_FRONTEND_LAYOUTOVERRIDESOURCE_H
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#include "clang/AST/ExternalASTSource.h"
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#include "clang/Basic/LLVM.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/StringRef.h"
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namespace clang {
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/// An external AST source that overrides the layout of
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/// a specified set of record types.
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///
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/// This class is used only for testing the ability of external AST sources
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/// to override the layout of record types. Its input is the output format
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/// of the command-line argument -fdump-record-layouts.
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class LayoutOverrideSource : public ExternalASTSource {
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/// The layout of a given record.
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struct Layout {
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/// The size of the record.
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uint64_t Size;
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/// The alignment of the record.
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uint64_t Align;
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/// The offsets of non-virtual base classes in the record.
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SmallVector<CharUnits, 8> BaseOffsets;
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/// The offsets of virtual base classes in the record.
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SmallVector<CharUnits, 8> VBaseOffsets;
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/// The offsets of the fields, in source order.
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SmallVector<uint64_t, 8> FieldOffsets;
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};
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/// The set of layouts that will be overridden.
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llvm::StringMap<Layout> Layouts;
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public:
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/// Create a new AST source that overrides the layout of some
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/// set of record types.
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///
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/// The file is the result of passing -fdump-record-layouts to a file.
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explicit LayoutOverrideSource(StringRef Filename);
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/// If this particular record type has an overridden layout,
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/// return that layout.
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bool
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layoutRecordType(const RecordDecl *Record,
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uint64_t &Size, uint64_t &Alignment,
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llvm::DenseMap<const FieldDecl *, uint64_t> &FieldOffsets,
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llvm::DenseMap<const CXXRecordDecl *, CharUnits> &BaseOffsets,
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llvm::DenseMap<const CXXRecordDecl *,
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CharUnits> &VirtualBaseOffsets) override;
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/// Dump the overridden layouts.
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void dump();
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};
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}
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#endif
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