mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-24 11:12:11 +00:00
1e7b32490d
This allows for building GoToSocial with [SQLite transpiled to WASM](https://github.com/ncruces/go-sqlite3) and accessed through [Wazero](https://wazero.io/).
83 lines
2.4 KiB
Go
83 lines
2.4 KiB
Go
package wazevo
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import (
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"encoding/binary"
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"reflect"
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"unsafe"
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"github.com/tetratelabs/wazero/experimental"
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"github.com/tetratelabs/wazero/internal/wasm"
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)
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func buildHostModuleOpaque(m *wasm.Module, listeners []experimental.FunctionListener) moduleContextOpaque {
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size := len(m.CodeSection)*16 + 32
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ret := newAlignedOpaque(size)
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binary.LittleEndian.PutUint64(ret[0:], uint64(uintptr(unsafe.Pointer(m))))
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if len(listeners) > 0 {
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sliceHeader := (*reflect.SliceHeader)(unsafe.Pointer(&listeners))
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binary.LittleEndian.PutUint64(ret[8:], uint64(sliceHeader.Data))
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binary.LittleEndian.PutUint64(ret[16:], uint64(sliceHeader.Len))
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binary.LittleEndian.PutUint64(ret[24:], uint64(sliceHeader.Cap))
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}
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offset := 32
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for i := range m.CodeSection {
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goFn := m.CodeSection[i].GoFunc
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writeIface(goFn, ret[offset:])
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offset += 16
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}
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return ret
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}
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func hostModuleFromOpaque(opaqueBegin uintptr) *wasm.Module {
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var opaqueViewOverSlice []byte
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sh := (*reflect.SliceHeader)(unsafe.Pointer(&opaqueViewOverSlice))
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sh.Data = opaqueBegin
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sh.Len = 32
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sh.Cap = 32
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return *(**wasm.Module)(unsafe.Pointer(&opaqueViewOverSlice[0]))
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}
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func hostModuleListenersSliceFromOpaque(opaqueBegin uintptr) []experimental.FunctionListener {
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var opaqueViewOverSlice []byte
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sh := (*reflect.SliceHeader)(unsafe.Pointer(&opaqueViewOverSlice))
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sh.Data = opaqueBegin
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sh.Len = 32
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sh.Cap = 32
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b := binary.LittleEndian.Uint64(opaqueViewOverSlice[8:])
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l := binary.LittleEndian.Uint64(opaqueViewOverSlice[16:])
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c := binary.LittleEndian.Uint64(opaqueViewOverSlice[24:])
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var ret []experimental.FunctionListener
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sh = (*reflect.SliceHeader)(unsafe.Pointer(&ret))
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sh.Data = uintptr(b)
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setSliceLimits(sh, uintptr(l), uintptr(c))
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return ret
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}
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func hostModuleGoFuncFromOpaque[T any](index int, opaqueBegin uintptr) T {
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offset := uintptr(index*16) + 32
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ptr := opaqueBegin + offset
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var opaqueViewOverFunction []byte
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sh := (*reflect.SliceHeader)(unsafe.Pointer(&opaqueViewOverFunction))
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sh.Data = ptr
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sh.Len = 16
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sh.Cap = 16
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return readIface(opaqueViewOverFunction).(T)
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}
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func writeIface(goFn interface{}, buf []byte) {
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goFnIface := *(*[2]uint64)(unsafe.Pointer(&goFn))
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binary.LittleEndian.PutUint64(buf, goFnIface[0])
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binary.LittleEndian.PutUint64(buf[8:], goFnIface[1])
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}
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func readIface(buf []byte) interface{} {
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b := binary.LittleEndian.Uint64(buf)
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s := binary.LittleEndian.Uint64(buf[8:])
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return *(*interface{})(unsafe.Pointer(&[2]uint64{b, s}))
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}
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