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/ADT/Twine.h" 17 #include "llvm/MC/MCSection.h" 18 #include "llvm/MC/MCSymbolWasm.h" 19 #include "llvm/Support/Debug.h" 20 #include "llvm/Support/raw_ostream.h" 21 22 namespace llvm { 23 24 class MCSymbol; 25 26 /// This represents a section on wasm. 27 class MCSectionWasm final : public MCSection { 28 /// This is the name of the section. The referenced memory is owned by 29 /// TargetLoweringObjectFileWasm's WasmUniqueMap. 30 StringRef SectionName; 31 32 unsigned UniqueID; 33 34 const MCSymbolWasm *Group; 35 36 // The offset of the MC function/data section in the wasm code/data section. 37 // For data relocations the offset is relative to start of the data payload 38 // itself and does not include the size of the section header. 39 uint64_t SectionOffset = 0; 40 41 // For data sections, this is the index of of the corresponding wasm data 42 // segment 43 uint32_t SegmentIndex = 0; 44 45 // Whether this data segment is passive 46 bool IsPassive = false; 47 48 friend class MCContext; MCSectionWasm(StringRef Section,SectionKind K,const MCSymbolWasm * group,unsigned UniqueID,MCSymbol * Begin)49 MCSectionWasm(StringRef Section, SectionKind K, const MCSymbolWasm *group, 50 unsigned UniqueID, MCSymbol *Begin) 51 : MCSection(SV_Wasm, K, Begin), SectionName(Section), UniqueID(UniqueID), 52 Group(group) {} 53 54 public: 55 /// Decides whether a '.section' directive should be printed before the 56 /// section name 57 bool shouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const; 58 getSectionName()59 StringRef getSectionName() const { return SectionName; } getGroup()60 const MCSymbolWasm *getGroup() const { return Group; } 61 62 void PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T, 63 raw_ostream &OS, 64 const MCExpr *Subsection) const override; 65 bool UseCodeAlign() const override; 66 bool isVirtualSection() const override; 67 isWasmData()68 bool isWasmData() const { 69 return Kind.isGlobalWriteableData() || Kind.isReadOnly() || 70 Kind.isThreadLocal(); 71 } 72 isUnique()73 bool isUnique() const { return UniqueID != ~0U; } getUniqueID()74 unsigned getUniqueID() const { return UniqueID; } 75 getSectionOffset()76 uint64_t getSectionOffset() const { return SectionOffset; } setSectionOffset(uint64_t Offset)77 void setSectionOffset(uint64_t Offset) { SectionOffset = Offset; } 78 getSegmentIndex()79 uint32_t getSegmentIndex() const { return SegmentIndex; } setSegmentIndex(uint32_t Index)80 void setSegmentIndex(uint32_t Index) { SegmentIndex = Index; } 81 getPassive()82 bool getPassive() const { 83 assert(isWasmData()); 84 return IsPassive; 85 } 86 void setPassive(bool V = true) { 87 assert(isWasmData()); 88 IsPassive = V; 89 } classof(const MCSection * S)90 static bool classof(const MCSection *S) { return S->getVariant() == SV_Wasm; } 91 }; 92 93 } // end namespace llvm 94 95 #endif 96