1 //===- MCSectionWasm.h - Wasm Machine Code Sections -------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file declares the MCSectionWasm class. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_MC_MCSECTIONWASM_H 15 #define LLVM_MC_MCSECTIONWASM_H 16 17 #include "llvm/ADT/Twine.h" 18 #include "llvm/MC/MCSection.h" 19 #include "llvm/MC/MCSymbolWasm.h" 20 #include "llvm/Support/Debug.h" 21 #include "llvm/Support/raw_ostream.h" 22 23 namespace llvm { 24 25 class MCSymbol; 26 27 /// This represents a section on wasm. 28 class MCSectionWasm final : public MCSection { 29 /// This is the name of the section. The referenced memory is owned by 30 /// TargetLoweringObjectFileWasm's WasmUniqueMap. 31 StringRef SectionName; 32 33 unsigned UniqueID; 34 35 const MCSymbolWasm *Group; 36 37 // The offset of the MC function/data section in the wasm code/data section. 38 // For data relocations the offset is relative to start of the data payload 39 // itself and does not include the size of the section header. 40 uint64_t SectionOffset = 0; 41 42 // For data sections, this is the index of of the corresponding wasm data 43 // segment 44 uint32_t SegmentIndex = 0; 45 46 friend class MCContext; MCSectionWasm(StringRef Section,SectionKind K,const MCSymbolWasm * group,unsigned UniqueID,MCSymbol * Begin)47 MCSectionWasm(StringRef Section, SectionKind K, const MCSymbolWasm *group, 48 unsigned UniqueID, MCSymbol *Begin) 49 : MCSection(SV_Wasm, K, Begin), SectionName(Section), UniqueID(UniqueID), 50 Group(group) {} 51 setSectionName(StringRef Name)52 void setSectionName(StringRef Name) { SectionName = Name; } 53 54 public: 55 ~MCSectionWasm(); 56 57 /// Decides whether a '.section' directive should be printed before the 58 /// section name 59 bool ShouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const; 60 getSectionName()61 StringRef getSectionName() const { return SectionName; } getGroup()62 const MCSymbolWasm *getGroup() const { return Group; } 63 64 void PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T, 65 raw_ostream &OS, 66 const MCExpr *Subsection) const override; 67 bool UseCodeAlign() const override; 68 bool isVirtualSection() const override; 69 isWasmData()70 bool isWasmData() const { 71 return Kind.isGlobalWriteableData() || Kind.isReadOnly(); 72 } 73 isUnique()74 bool isUnique() const { return UniqueID != ~0U; } getUniqueID()75 unsigned getUniqueID() const { return UniqueID; } 76 getSectionOffset()77 uint64_t getSectionOffset() const { return SectionOffset; } setSectionOffset(uint64_t Offset)78 void setSectionOffset(uint64_t Offset) { SectionOffset = Offset; } 79 getSegmentIndex()80 uint32_t getSegmentIndex() const { return SegmentIndex; } setSegmentIndex(uint32_t Index)81 void setSegmentIndex(uint32_t Index) { SegmentIndex = Index; } 82 classof(const MCSection * S)83 static bool classof(const MCSection *S) { return S->getVariant() == SV_Wasm; } 84 }; 85 86 } // end namespace llvm 87 88 #endif 89