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| Rev | Author | Line No. | Line |
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| 14 | pmbaty | 1 | //===--- LayoutOverrideSource.h --Override Record Layouts -------*- C++ -*-===// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |||
| 9 | #ifndef LLVM_CLANG_FRONTEND_LAYOUTOVERRIDESOURCE_H |
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| 10 | #define LLVM_CLANG_FRONTEND_LAYOUTOVERRIDESOURCE_H |
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| 11 | |||
| 12 | #include "clang/AST/ExternalASTSource.h" |
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| 13 | #include "clang/Basic/LLVM.h" |
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| 14 | #include "llvm/ADT/StringMap.h" |
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| 15 | #include "llvm/ADT/StringRef.h" |
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| 16 | |||
| 17 | namespace clang { |
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| 18 | /// An external AST source that overrides the layout of |
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| 19 | /// a specified set of record types. |
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| 20 | /// |
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| 21 | /// This class is used only for testing the ability of external AST sources |
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| 22 | /// to override the layout of record types. Its input is the output format |
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| 23 | /// of the command-line argument -fdump-record-layouts. |
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| 24 | class LayoutOverrideSource : public ExternalASTSource { |
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| 25 | /// The layout of a given record. |
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| 26 | struct Layout { |
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| 27 | /// The size of the record. |
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| 28 | uint64_t Size; |
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| 29 | |||
| 30 | /// The alignment of the record. |
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| 31 | uint64_t Align; |
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| 32 | |||
| 33 | /// The offsets of the fields, in source order. |
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| 34 | SmallVector<uint64_t, 8> FieldOffsets; |
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| 35 | }; |
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| 36 | |||
| 37 | /// The set of layouts that will be overridden. |
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| 38 | llvm::StringMap<Layout> Layouts; |
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| 39 | |||
| 40 | public: |
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| 41 | /// Create a new AST source that overrides the layout of some |
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| 42 | /// set of record types. |
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| 43 | /// |
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| 44 | /// The file is the result of passing -fdump-record-layouts to a file. |
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| 45 | explicit LayoutOverrideSource(StringRef Filename); |
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| 46 | |||
| 47 | /// If this particular record type has an overridden layout, |
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| 48 | /// return that layout. |
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| 49 | bool |
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| 50 | layoutRecordType(const RecordDecl *Record, |
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| 51 | uint64_t &Size, uint64_t &Alignment, |
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| 52 | llvm::DenseMap<const FieldDecl *, uint64_t> &FieldOffsets, |
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| 53 | llvm::DenseMap<const CXXRecordDecl *, CharUnits> &BaseOffsets, |
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| 54 | llvm::DenseMap<const CXXRecordDecl *, |
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| 55 | CharUnits> &VirtualBaseOffsets) override; |
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| 56 | |||
| 57 | /// Dump the overridden layouts. |
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| 58 | void dump(); |
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| 59 | }; |
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| 60 | } |
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| 61 | |||
| 62 | #endif |