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6ed66fd14e
This is combination of two patches by Nicholas Wilson: 1. https://reviews.llvm.org/D41954 2. https://reviews.llvm.org/D42495 Along with a few local modifications: - One change I made was to add the UNDEFINED bit to the binary format to avoid the extra byte used when writing data symbols. Although this bit is redundant for other symbols types (i.e. undefined can be implied if a function or global is a wasm import) - I prefer to be explicit and consistent and not have derived flags. - Some field renaming. - Some reverting of unrelated minor changes. - No test output differences. Differential Revision: https://reviews.llvm.org/D43147 llvm-svn: 325860
89 lines
2.8 KiB
C++
89 lines
2.8 KiB
C++
//===- MCSectionWasm.h - Wasm Machine Code Sections -------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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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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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void setSectionName(StringRef Name) { SectionName = Name; }
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public:
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~MCSectionWasm();
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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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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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