clang 17.0.0git
LayoutOverrideSource.h
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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
13#include "clang/Basic/LLVM.h"
14#include "llvm/ADT/StringMap.h"
15#include "llvm/ADT/StringRef.h"
16
17namespace 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.
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
StringRef Filename
Definition: Format.cpp:2772
Forward-declares and imports various common LLVM datatypes that clang wants to use unqualified.
Represents a C++ struct/union/class.
Definition: DeclCXX.h:254
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
Abstract interface for external sources of AST nodes.
An external AST source that overrides the layout of a specified set of record types.
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
If this particular record type has an overridden layout, return that layout.
void dump()
Dump the overridden layouts.
Represents a struct/union/class.
Definition: Decl.h:3996