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