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 // Whether this data segment is passive 41 bool IsPassive = false; 42 43 // The storage of Name is owned by MCContext's WasmUniquingMap. 44 friend class MCContext; 45 MCSectionWasm(StringRef Name, SectionKind K, const MCSymbolWasm *group, 46 unsigned UniqueID, MCSymbol *Begin) 47 : MCSection(SV_Wasm, Name, K, Begin), UniqueID(UniqueID), Group(group) {} 48 49 public: 50 /// Decides whether a '.section' directive should be printed before the 51 /// section name 52 bool shouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const; 53 54 const MCSymbolWasm *getGroup() const { return Group; } 55 56 void PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T, 57 raw_ostream &OS, 58 const MCExpr *Subsection) const override; 59 bool UseCodeAlign() const override; 60 bool isVirtualSection() const override; 61 62 bool isWasmData() const { 63 return Kind.isGlobalWriteableData() || Kind.isReadOnly() || 64 Kind.isThreadLocal(); 65 } 66 67 bool isUnique() const { return UniqueID != ~0U; } 68 unsigned getUniqueID() const { return UniqueID; } 69 70 uint64_t getSectionOffset() const { return SectionOffset; } 71 void setSectionOffset(uint64_t Offset) { SectionOffset = Offset; } 72 73 uint32_t getSegmentIndex() const { return SegmentIndex; } 74 void setSegmentIndex(uint32_t Index) { SegmentIndex = Index; } 75 76 bool getPassive() const { 77 assert(isWasmData()); 78 return IsPassive; 79 } 80 void setPassive(bool V = true) { 81 assert(isWasmData()); 82 IsPassive = V; 83 } 84 static bool classof(const MCSection *S) { return S->getVariant() == SV_Wasm; } 85 }; 86 87 } // end namespace llvm 88 89 #endif 90