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 18 namespace llvm { 19 20 class MCSymbol; 21 class MCSymbolWasm; 22 class StringRef; 23 class raw_ostream; 24 25 /// This represents a section on wasm. 26 class 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; MCSectionWasm(StringRef Name,SectionKind K,unsigned SegmentFlags,const MCSymbolWasm * Group,unsigned UniqueID,MCSymbol * Begin)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 53 public: 54 /// Decides whether a '.section' directive should be printed before the 55 /// section name 56 bool shouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const; 57 getGroup()58 const MCSymbolWasm *getGroup() const { return Group; } getSegmentFlags()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 isWasmData()67 bool isWasmData() const { 68 return Kind.isGlobalWriteableData() || Kind.isReadOnly() || 69 Kind.isThreadLocal(); 70 } 71 isUnique()72 bool isUnique() const { return UniqueID != ~0U; } getUniqueID()73 unsigned getUniqueID() const { return UniqueID; } 74 getSectionOffset()75 uint64_t getSectionOffset() const { return SectionOffset; } setSectionOffset(uint64_t Offset)76 void setSectionOffset(uint64_t Offset) { SectionOffset = Offset; } 77 getSegmentIndex()78 uint32_t getSegmentIndex() const { return SegmentIndex; } setSegmentIndex(uint32_t Index)79 void setSegmentIndex(uint32_t Index) { SegmentIndex = Index; } 80 getPassive()81 bool getPassive() const { 82 assert(isWasmData()); 83 return IsPassive; 84 } 85 void setPassive(bool V = true) { 86 assert(isWasmData()); 87 IsPassive = V; 88 } classof(const MCSection * S)89 static bool classof(const MCSection *S) { return S->getVariant() == SV_Wasm; } 90 }; 91 92 } // end namespace llvm 93 94 #endif 95