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fa82617e41
Summary: Rename MemoryIndex to InitFlags and implement logic for determining data segment layout in ObjectYAML and MC. Also adds a "passive" flag for the .section assembler directive although this cannot be assembled yet because the assembler does not support data sections. Reviewers: sbc100, aardappel, aheejin, dschuff Subscribers: jgravelle-google, hiraditya, sunfish, rupprecht, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D57938 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@354397 91177308-0d34-0410-b5e6-96231b3b80d8
95 lines
3.0 KiB
C++
95 lines
3.0 KiB
C++
//===- MCSectionWasm.h - Wasm Machine Code Sections -------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the MCSectionWasm class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCSECTIONWASM_H
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#define LLVM_MC_MCSECTIONWASM_H
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#include "llvm/ADT/Twine.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCSymbolWasm.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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namespace llvm {
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class MCSymbol;
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/// This represents a section on wasm.
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class MCSectionWasm final : public MCSection {
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/// This is the name of the section. The referenced memory is owned by
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/// TargetLoweringObjectFileWasm's WasmUniqueMap.
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StringRef SectionName;
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unsigned UniqueID;
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const MCSymbolWasm *Group;
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// The offset of the MC function/data section in the wasm code/data section.
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// For data relocations the offset is relative to start of the data payload
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// itself and does not include the size of the section header.
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uint64_t SectionOffset = 0;
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// For data sections, this is the index of of the corresponding wasm data
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// segment
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uint32_t SegmentIndex = 0;
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// Whether this data segment is passive
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bool IsPassive = false;
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friend class MCContext;
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MCSectionWasm(StringRef Section, SectionKind K, const MCSymbolWasm *group,
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unsigned UniqueID, MCSymbol *Begin)
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: MCSection(SV_Wasm, K, Begin), SectionName(Section), UniqueID(UniqueID),
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Group(group) {}
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public:
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/// Decides whether a '.section' directive should be printed before the
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/// section name
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bool shouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const;
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StringRef getSectionName() const { return SectionName; }
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const MCSymbolWasm *getGroup() const { return Group; }
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void PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
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raw_ostream &OS,
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const MCExpr *Subsection) const override;
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bool UseCodeAlign() const override;
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bool isVirtualSection() const override;
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bool isWasmData() const {
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return Kind.isGlobalWriteableData() || Kind.isReadOnly();
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}
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bool isUnique() const { return UniqueID != ~0U; }
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unsigned getUniqueID() const { return UniqueID; }
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uint64_t getSectionOffset() const { return SectionOffset; }
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void setSectionOffset(uint64_t Offset) { SectionOffset = Offset; }
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uint32_t getSegmentIndex() const { return SegmentIndex; }
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void setSegmentIndex(uint32_t Index) { SegmentIndex = Index; }
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bool getPassive() const {
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assert(isWasmData());
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return IsPassive;
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}
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void setPassive(bool V = true) {
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assert(isWasmData());
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IsPassive = V;
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}
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static bool classof(const MCSection *S) { return S->getVariant() == SV_Wasm; }
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};
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} // end namespace llvm
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#endif
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