| 1 | //===--- LayoutOverrideSource.h --Override Record Layouts -------*- C++ -*-===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef LLVM_CLANG_FRONTEND_LAYOUTOVERRIDESOURCE_H |
| 10 | #define LLVM_CLANG_FRONTEND_LAYOUTOVERRIDESOURCE_H |
| 11 | |
| 12 | #include "clang/AST/ExternalASTSource.h" |
| 13 | #include "clang/Basic/LLVM.h" |
| 14 | #include "llvm/ADT/StringMap.h" |
| 15 | #include "llvm/ADT/StringRef.h" |
| 16 | |
| 17 | namespace clang { |
| 18 | /// An external AST source that overrides the layout of |
| 19 | /// a specified set of record types. |
| 20 | /// |
| 21 | /// This class is used only for testing the ability of external AST sources |
| 22 | /// to override the layout of record types. Its input is the output format |
| 23 | /// of the command-line argument -fdump-record-layouts. |
| 24 | class LayoutOverrideSource : public ExternalASTSource { |
| 25 | /// The layout of a given record. |
| 26 | struct Layout { |
| 27 | /// The size of the record. |
| 28 | uint64_t Size; |
| 29 | |
| 30 | /// The alignment of the record. |
| 31 | uint64_t Align; |
| 32 | |
| 33 | /// The offsets of the fields, in source order. |
| 34 | SmallVector<uint64_t, 8> FieldOffsets; |
| 35 | }; |
| 36 | |
| 37 | /// The set of layouts that will be overridden. |
| 38 | llvm::StringMap<Layout> Layouts; |
| 39 | |
| 40 | public: |
| 41 | /// Create a new AST source that overrides the layout of some |
| 42 | /// set of record types. |
| 43 | /// |
| 44 | /// The file is the result of passing -fdump-record-layouts to a file. |
| 45 | explicit LayoutOverrideSource(StringRef Filename); |
| 46 | |
| 47 | /// If this particular record type has an overridden layout, |
| 48 | /// return that layout. |
| 49 | bool |
| 50 | layoutRecordType(const RecordDecl *Record, |
| 51 | uint64_t &Size, uint64_t &Alignment, |
| 52 | llvm::DenseMap<const FieldDecl *, uint64_t> &FieldOffsets, |
| 53 | llvm::DenseMap<const CXXRecordDecl *, CharUnits> &BaseOffsets, |
| 54 | llvm::DenseMap<const CXXRecordDecl *, |
| 55 | CharUnits> &VirtualBaseOffsets) override; |
| 56 | |
| 57 | /// Dump the overridden layouts. |
| 58 | void dump(); |
| 59 | }; |
| 60 | } |
| 61 | |
| 62 | #endif |
| 63 |