include/llvm/MC/MCSectionWasm.h

   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   friend class MCContext;
  46   MCSectionWasm(StringRef Section, SectionKind K, const MCSymbolWasm *group,
  47                 unsigned UniqueID, MCSymbol *Begin)
  48       : MCSection(SV_Wasm, K, Begin), SectionName(Section), UniqueID(UniqueID),
  49         Group(group) {}
  50
  51 public:
  52   /// Decides whether a '.section' directive should be printed before the
  53   /// section name
  54   bool shouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const;
  55
  56   StringRef getSectionName() const { return SectionName; }
  57   const MCSymbolWasm *getGroup() const { return Group; }
  58
  59   void PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
  60                             raw_ostream &OS,
  61                             const MCExpr *Subsection) const override;
  62   bool UseCodeAlign() const override;
  63   bool isVirtualSection() const override;
  64
  65   bool isWasmData() const {
  66     return Kind.isGlobalWriteableData() || Kind.isReadOnly();
  67   }
  68
  69   bool isUnique() const { return UniqueID != ~0U; }
  70   unsigned getUniqueID() const { return UniqueID; }
  71
  72   uint64_t getSectionOffset() const { return SectionOffset; }
  73   void setSectionOffset(uint64_t Offset) { SectionOffset = Offset; }
  74
  75   uint32_t getSegmentIndex() const { return SegmentIndex; }
  76   void setSegmentIndex(uint32_t Index) { SegmentIndex = Index; }
  77
  78   static bool classof(const MCSection *S) { return S->getVariant() == SV_Wasm; }
  79 };
  80
  81 } // end namespace llvm
  82
  83 #endif