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 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 bool IsWasmData; 44 45 bool IsMetadata; 46 47 // For data sections, bitfield of WasmSegmentFlag 48 unsigned SegmentFlags; 49 50 // The storage of Name is owned by MCContext's WasmUniquingMap. 51 friend class MCContext; MCSectionWasm(StringRef Name,SectionKind K,unsigned SegmentFlags,const MCSymbolWasm * Group,unsigned UniqueID,MCSymbol * Begin)52 MCSectionWasm(StringRef Name, SectionKind K, unsigned SegmentFlags, 53 const MCSymbolWasm *Group, unsigned UniqueID, MCSymbol *Begin) 54 : MCSection(SV_Wasm, Name, K.isText(), /*IsVirtual=*/false, Begin), 55 UniqueID(UniqueID), Group(Group), 56 IsWasmData(K.isReadOnly() || K.isWriteable()), 57 IsMetadata(K.isMetadata()), SegmentFlags(SegmentFlags) {} 58 59 public: 60 /// Decides whether a '.section' directive should be printed before the 61 /// section name 62 bool shouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const; 63 getGroup()64 const MCSymbolWasm *getGroup() const { return Group; } getSegmentFlags()65 unsigned getSegmentFlags() const { return SegmentFlags; } 66 67 void printSwitchToSection(const MCAsmInfo &MAI, const Triple &T, 68 raw_ostream &OS, 69 uint32_t Subsection) const override; 70 bool useCodeAlign() const override; 71 isWasmData()72 bool isWasmData() const { return IsWasmData; } isMetadata()73 bool isMetadata() const { return IsMetadata; } 74 isUnique()75 bool isUnique() const { return UniqueID != ~0U; } getUniqueID()76 unsigned getUniqueID() const { return UniqueID; } 77 getSectionOffset()78 uint64_t getSectionOffset() const { return SectionOffset; } setSectionOffset(uint64_t Offset)79 void setSectionOffset(uint64_t Offset) { SectionOffset = Offset; } 80 getSegmentIndex()81 uint32_t getSegmentIndex() const { return SegmentIndex; } setSegmentIndex(uint32_t Index)82 void setSegmentIndex(uint32_t Index) { SegmentIndex = Index; } 83 getPassive()84 bool getPassive() const { 85 assert(isWasmData()); 86 return IsPassive; 87 } 88 void setPassive(bool V = true) { 89 assert(isWasmData()); 90 IsPassive = V; 91 } classof(const MCSection * S)92 static bool classof(const MCSection *S) { return S->getVariant() == SV_Wasm; } 93 }; 94 95 } // end namespace llvm 96 97 #endif 98