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