LLVM 17.0.0git
MCSectionWasm.h
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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 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 {
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 {
83 return IsPassive;
84 }
85 void setPassive(bool V = true) {
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
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
This class is intended to be used as a base class for asm properties and features specific to the tar...
Definition: MCAsmInfo.h:56
Context object for machine code objects.
Definition: MCContext.h:76
Base class for the full range of assembler expressions which are needed for parsing.
Definition: MCExpr.h:35
This represents a section on wasm.
Definition: MCSectionWasm.h:26
uint32_t getSegmentIndex() const
Definition: MCSectionWasm.h:78
bool useCodeAlign() const override
Return true if a .align directive should use "optimized nops" to fill instead of 0s.
void printSwitchToSection(const MCAsmInfo &MAI, const Triple &T, raw_ostream &OS, const MCExpr *Subsection) const override
void setSegmentIndex(uint32_t Index)
Definition: MCSectionWasm.h:79
static bool classof(const MCSection *S)
Definition: MCSectionWasm.h:89
bool shouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const
Decides whether a '.section' directive should be printed before the section name.
void setPassive(bool V=true)
Definition: MCSectionWasm.h:85
bool isVirtualSection() const override
Check whether this section is "virtual", that is has no actual object file contents.
bool isUnique() const
Definition: MCSectionWasm.h:72
bool isWasmData() const
Definition: MCSectionWasm.h:67
const MCSymbolWasm * getGroup() const
Definition: MCSectionWasm.h:58
void setSectionOffset(uint64_t Offset)
Definition: MCSectionWasm.h:76
unsigned getSegmentFlags() const
Definition: MCSectionWasm.h:59
uint64_t getSectionOffset() const
Definition: MCSectionWasm.h:75
unsigned getUniqueID() const
Definition: MCSectionWasm.h:73
bool getPassive() const
Definition: MCSectionWasm.h:81
Instances of this class represent a uniqued identifier for a section in the current translation unit.
Definition: MCSection.h:39
SectionVariant getVariant() const
Definition: MCSection.h:127
StringRef Name
Definition: MCSection.h:113
SectionKind Kind
Definition: MCSection.h:115
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:41
SectionKind - This is a simple POD value that classifies the properties of a section.
Definition: SectionKind.h:22
bool isThreadLocal() const
Definition: SectionKind.h:157
bool isReadOnly() const
Definition: SectionKind.h:131
bool isGlobalWriteableData() const
Definition: SectionKind.h:165
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:50
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:44
This class implements an extremely fast bulk output stream that can only output to a stream.
Definition: raw_ostream.h:52
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
@ Offset
Definition: DWP.cpp:406