1//===- MCSectionWasm.h - Wasm Machine Code Sections -------------*- 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// This file declares the MCSectionWasm class.
10//
11//===----------------------------------------------------------------------===//
12
13#ifndef LLVM_MC_MCSECTIONWASM_H
14#define LLVM_MC_MCSECTIONWASM_H
15
16#include "llvm/MC/MCSection.h"
17
18namespace llvm {
19
20class MCSymbol;
21class MCSymbolWasm;
22class StringRef;
23class raw_ostream;
24
25/// This represents a section on wasm.
26class MCSectionWasm final : public MCSection {
27 unsigned UniqueID;
28
29 const MCSymbolWasm *Group;
30
31 // The offset of the MC function/data section in the wasm code/data section.
32 // For data relocations the offset is relative to start of the data payload
33 // itself and does not include the size of the section header.
34 uint64_t SectionOffset = 0;
35
36 // For data sections, this is the index of the corresponding wasm data
37 // segment
38 uint32_t SegmentIndex = 0;
39
40 // For data sections, whether to use a passive segment
41 bool IsPassive = false;
42
43 // For data sections, bitfield of WasmSegmentFlag
44 unsigned SegmentFlags;
45
46 // The storage of Name is owned by MCContext's WasmUniquingMap.
47 friend class MCContext;
48 MCSectionWasm(StringRef Name, SectionKind K, unsigned SegmentFlags,
49 const MCSymbolWasm *Group, unsigned UniqueID, MCSymbol *Begin)
50 : MCSection(SV_Wasm, Name, K, Begin), UniqueID(UniqueID), Group(Group),
51 SegmentFlags(SegmentFlags) {}
52
53public:
54 /// Decides whether a '.section' directive should be printed before the
55 /// section name
56 bool shouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const;
57
58 const MCSymbolWasm *getGroup() const { return Group; }
59 unsigned getSegmentFlags() const { return SegmentFlags; }
60
61 void printSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
62 raw_ostream &OS,
63 const MCExpr *Subsection) const override;
64 bool useCodeAlign() const override;
65 bool isVirtualSection() const override;
66
67 bool isWasmData() const {
68 return Kind.isGlobalWriteableData() || Kind.isReadOnly() ||
69 Kind.isThreadLocal();
70 }
71
72 bool isUnique() const { return UniqueID != ~0U; }
73 unsigned getUniqueID() const { return UniqueID; }
74
75 uint64_t getSectionOffset() const { return SectionOffset; }
76 void setSectionOffset(uint64_t Offset) { SectionOffset = Offset; }
77
78 uint32_t getSegmentIndex() const { return SegmentIndex; }
79 void setSegmentIndex(uint32_t Index) { SegmentIndex = Index; }
80
81 bool getPassive() const {
82 assert(isWasmData());
83 return IsPassive;
84 }
85 void setPassive(bool V = true) {
86 assert(isWasmData());
87 IsPassive = V;
88 }
89 static bool classof(const MCSection *S) { return S->getVariant() == SV_Wasm; }
90};
91
92} // end namespace llvm
93
94#endif
95

source code of llvm/include/llvm/MC/MCSectionWasm.h