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| Rev | Author | Line No. | Line |
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| 14 | pmbaty | 1 | //===- MCSectionWasm.h - Wasm Machine Code Sections -------------*- C++ -*-===// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file declares the MCSectionWasm class. |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |||
| 13 | #ifndef LLVM_MC_MCSECTIONWASM_H |
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| 14 | #define LLVM_MC_MCSECTIONWASM_H |
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| 15 | |||
| 16 | #include "llvm/MC/MCSection.h" |
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| 17 | |||
| 18 | namespace llvm { |
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| 19 | |||
| 20 | class MCSymbol; |
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| 21 | class MCSymbolWasm; |
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| 22 | class StringRef; |
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| 23 | class raw_ostream; |
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| 24 | |||
| 25 | /// This represents a section on wasm. |
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| 26 | class MCSectionWasm final : public MCSection { |
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| 27 | unsigned UniqueID; |
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| 28 | |||
| 29 | const MCSymbolWasm *Group; |
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| 30 | |||
| 31 | // The offset of the MC function/data section in the wasm code/data section. |
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| 32 | // For data relocations the offset is relative to start of the data payload |
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| 33 | // itself and does not include the size of the section header. |
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| 34 | uint64_t SectionOffset = 0; |
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| 35 | |||
| 36 | // For data sections, this is the index of of the corresponding wasm data |
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| 37 | // segment |
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| 38 | uint32_t SegmentIndex = 0; |
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| 39 | |||
| 40 | // For data sections, whether to use a passive segment |
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| 41 | bool IsPassive = false; |
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| 42 | |||
| 43 | // For data sections, bitfield of WasmSegmentFlag |
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| 44 | unsigned SegmentFlags; |
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| 45 | |||
| 46 | // The storage of Name is owned by MCContext's WasmUniquingMap. |
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| 47 | friend class MCContext; |
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| 48 | MCSectionWasm(StringRef Name, SectionKind K, unsigned SegmentFlags, |
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| 49 | const MCSymbolWasm *Group, unsigned UniqueID, MCSymbol *Begin) |
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| 50 | : MCSection(SV_Wasm, Name, K, Begin), UniqueID(UniqueID), Group(Group), |
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| 51 | SegmentFlags(SegmentFlags) {} |
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| 52 | |||
| 53 | public: |
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| 54 | /// Decides whether a '.section' directive should be printed before the |
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| 55 | /// section name |
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| 56 | bool shouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const; |
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| 57 | |||
| 58 | const MCSymbolWasm *getGroup() const { return Group; } |
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| 59 | unsigned getSegmentFlags() const { return SegmentFlags; } |
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| 60 | |||
| 61 | void printSwitchToSection(const MCAsmInfo &MAI, const Triple &T, |
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| 62 | raw_ostream &OS, |
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| 63 | const MCExpr *Subsection) const override; |
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| 64 | bool useCodeAlign() const override; |
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| 65 | bool isVirtualSection() const override; |
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| 66 | |||
| 67 | bool isWasmData() const { |
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| 68 | return Kind.isGlobalWriteableData() || Kind.isReadOnly() || |
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| 69 | Kind.isThreadLocal(); |
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| 70 | } |
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| 71 | |||
| 72 | bool isUnique() const { return UniqueID != ~0U; } |
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| 73 | unsigned getUniqueID() const { return UniqueID; } |
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| 74 | |||
| 75 | uint64_t getSectionOffset() const { return SectionOffset; } |
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| 76 | void setSectionOffset(uint64_t Offset) { SectionOffset = Offset; } |
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| 77 | |||
| 78 | uint32_t getSegmentIndex() const { return SegmentIndex; } |
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| 79 | void setSegmentIndex(uint32_t Index) { SegmentIndex = Index; } |
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| 80 | |||
| 81 | bool getPassive() const { |
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| 82 | assert(isWasmData()); |
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| 83 | return IsPassive; |
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| 84 | } |
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| 85 | void setPassive(bool V = true) { |
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| 86 | assert(isWasmData()); |
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| 87 | IsPassive = V; |
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| 88 | } |
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| 89 | static bool classof(const MCSection *S) { return S->getVariant() == SV_Wasm; } |
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| 90 | }; |
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| 91 | |||
| 92 | } // end namespace llvm |
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| 93 | |||
| 94 | #endif |