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| //===- MCSectionWasm.h - Wasm Machine Code Sections -------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file declares the MCSectionWasm class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_MCSECTIONWASM_H
#define LLVM_MC_MCSECTIONWASM_H
#include "llvm/ADT/Twine.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSymbolWasm.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
namespace llvm {
class MCSymbol;
/// This represents a section on wasm.
class MCSectionWasm final : public MCSection {
/// This is the name of the section. The referenced memory is owned by
/// TargetLoweringObjectFileWasm's WasmUniqueMap.
StringRef SectionName;
unsigned UniqueID;
const MCSymbolWasm *Group;
// The offset of the MC function/data section in the wasm code/data section.
// For data relocations the offset is relative to start of the data payload
// itself and does not include the size of the section header.
uint64_t SectionOffset = 0;
// For data sections, this is the index of of the corresponding wasm data
// segment
uint32_t SegmentIndex = 0;
// Whether this data segment is passive
bool IsPassive = false;
friend class MCContext;
MCSectionWasm(StringRef Section, SectionKind K, const MCSymbolWasm *group,
unsigned UniqueID, MCSymbol *Begin)
: MCSection(SV_Wasm, K, Begin), SectionName(Section), UniqueID(UniqueID),
Group(group) {}
public:
/// Decides whether a '.section' directive should be printed before the
/// section name
bool shouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const;
StringRef getSectionName() const { return SectionName; }
const MCSymbolWasm *getGroup() const { return Group; }
void PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
raw_ostream &OS,
const MCExpr *Subsection) const override;
bool UseCodeAlign() const override;
bool isVirtualSection() const override;
bool isWasmData() const {
return Kind.isGlobalWriteableData() || Kind.isReadOnly() ||
Kind.isThreadLocal();
}
bool isUnique() const { return UniqueID != ~0U; }
unsigned getUniqueID() const { return UniqueID; }
uint64_t getSectionOffset() const { return SectionOffset; }
void setSectionOffset(uint64_t Offset) { SectionOffset = Offset; }
uint32_t getSegmentIndex() const { return SegmentIndex; }
void setSegmentIndex(uint32_t Index) { SegmentIndex = Index; }
bool getPassive() const {
assert(isWasmData());
return IsPassive;
}
void setPassive(bool V = true) {
assert(isWasmData());
IsPassive = V;
}
static bool classof(const MCSection *S) { return S->getVariant() == SV_Wasm; }
};
} // end namespace llvm
#endif
|