41 lines
1.1 KiB
Go
41 lines
1.1 KiB
Go
package binaryencoding
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import (
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"fmt"
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"github.com/tetratelabs/wazero/internal/leb128"
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"github.com/tetratelabs/wazero/internal/wasm"
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)
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// EncodeImport returns the wasm.Import encoded in WebAssembly 1.0 (20191205) Binary Format.
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//
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// See https://www.w3.org/TR/2019/REC-wasm-core-1-20191205/#binary-import
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func EncodeImport(i *wasm.Import) []byte {
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data := encodeSizePrefixed([]byte(i.Module))
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data = append(data, encodeSizePrefixed([]byte(i.Name))...)
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data = append(data, i.Type)
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switch i.Type {
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case wasm.ExternTypeFunc:
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data = append(data, leb128.EncodeUint32(i.DescFunc)...)
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case wasm.ExternTypeTable:
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data = append(data, wasm.RefTypeFuncref)
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data = append(data, EncodeLimitsType(i.DescTable.Min, i.DescTable.Max)...)
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case wasm.ExternTypeMemory:
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maxPtr := &i.DescMem.Max
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if !i.DescMem.IsMaxEncoded {
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maxPtr = nil
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}
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data = append(data, EncodeLimitsType(i.DescMem.Min, maxPtr)...)
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case wasm.ExternTypeGlobal:
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g := i.DescGlobal
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var mutable byte
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if g.Mutable {
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mutable = 1
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}
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data = append(data, g.ValType, mutable)
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default:
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panic(fmt.Errorf("invalid externtype: %s", wasm.ExternTypeName(i.Type)))
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}
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return data
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}
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