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 private: 30 /// This is the name of the section. The referenced memory is owned by 31 /// TargetLoweringObjectFileWasm's WasmUniqueMap. 32 StringRef SectionName; 33 34 /// This is the sh_type field of a section, drawn from the enums below. 35 unsigned Type; 36 37 /// This is the sh_flags field of a section, drawn from the enums below. 38 unsigned Flags; 39 40 unsigned UniqueID; 41 42 const MCSymbolWasm *Group; 43 44 // The offset of the MC function/data section in the wasm code/data section. 45 // For data relocations the offset is relative to start of the data payload 46 // itself and does not include the size of the section header. 47 uint64_t SectionOffset; 48 49 friend class MCContext; 50 MCSectionWasm(StringRef Section, unsigned type, unsigned flags, SectionKind K, 51 const MCSymbolWasm *group, unsigned UniqueID, MCSymbol *Begin) 52 : MCSection(SV_Wasm, K, Begin), SectionName(Section), Type(type), 53 Flags(flags), UniqueID(UniqueID), Group(group), SectionOffset(0) { 54 } 55 56 void setSectionName(StringRef Name) { SectionName = Name; } 57 58 public: 59 ~MCSectionWasm(); 60 61 /// Decides whether a '.section' directive should be printed before the 62 /// section name 63 bool ShouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const; 64 65 StringRef getSectionName() const { return SectionName; } 66 unsigned getType() const { return Type; } 67 unsigned getFlags() const { return Flags; } 68 void setFlags(unsigned F) { Flags = F; } 69 const MCSymbolWasm *getGroup() const { return Group; } 70 71 void PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T, 72 raw_ostream &OS, 73 const MCExpr *Subsection) const override; 74 bool UseCodeAlign() const override; 75 bool isVirtualSection() const override; 76 77 bool isUnique() const { return UniqueID != ~0U; } 78 unsigned getUniqueID() const { return UniqueID; } 79 80 uint64_t getSectionOffset() const { return SectionOffset; } 81 void setSectionOffset(uint64_t Offset) { SectionOffset = Offset; } 82 83 static bool classof(const MCSection *S) { return S->getVariant() == SV_Wasm; } 84 }; 85 86 } // end namespace llvm 87 88 #endif 89
