334 lines
8.0 KiB
Go
334 lines
8.0 KiB
Go
// Package sqlite3 wraps the C SQLite API.
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package sqlite3
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import (
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"context"
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"math"
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"math/bits"
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"os"
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"sync"
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"unsafe"
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"github.com/ncruces/go-sqlite3/internal/util"
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"github.com/ncruces/go-sqlite3/vfs"
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"github.com/tetratelabs/wazero"
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"github.com/tetratelabs/wazero/api"
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)
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// Configure SQLite Wasm.
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//
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// Importing package embed initializes [Binary]
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// with an appropriate build of SQLite:
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//
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// import _ "github.com/ncruces/go-sqlite3/embed"
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var (
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Binary []byte // Wasm binary to load.
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Path string // Path to load the binary from.
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RuntimeConfig wazero.RuntimeConfig
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)
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var instance struct {
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runtime wazero.Runtime
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compiled wazero.CompiledModule
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err error
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once sync.Once
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}
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func compileSQLite() {
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if RuntimeConfig == nil {
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RuntimeConfig = wazero.NewRuntimeConfig()
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}
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ctx := context.Background()
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instance.runtime = wazero.NewRuntimeWithConfig(ctx, RuntimeConfig)
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env := instance.runtime.NewHostModuleBuilder("env")
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env = vfs.ExportHostFunctions(env)
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env = exportCallbacks(env)
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_, instance.err = env.Instantiate(ctx)
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if instance.err != nil {
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return
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}
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bin := Binary
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if bin == nil && Path != "" {
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bin, instance.err = os.ReadFile(Path)
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if instance.err != nil {
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return
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}
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}
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if bin == nil {
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instance.err = util.NoBinaryErr
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return
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}
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instance.compiled, instance.err = instance.runtime.CompileModule(ctx, bin)
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}
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type sqlite struct {
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ctx context.Context
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mod api.Module
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funcs struct {
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fn [32]api.Function
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id [32]*byte
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mask uint32
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}
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stack [8]uint64
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freer uint32
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}
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func instantiateSQLite() (sqlt *sqlite, err error) {
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instance.once.Do(compileSQLite)
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if instance.err != nil {
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return nil, instance.err
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}
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sqlt = new(sqlite)
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sqlt.ctx = util.NewContext(context.Background())
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sqlt.mod, err = instance.runtime.InstantiateModule(sqlt.ctx,
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instance.compiled, wazero.NewModuleConfig().WithName(""))
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if err != nil {
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return nil, err
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}
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global := sqlt.mod.ExportedGlobal("malloc_destructor")
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if global == nil {
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return nil, util.BadBinaryErr
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}
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sqlt.freer = util.ReadUint32(sqlt.mod, uint32(global.Get()))
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if sqlt.freer == 0 {
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return nil, util.BadBinaryErr
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}
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return sqlt, nil
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}
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func (sqlt *sqlite) close() error {
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return sqlt.mod.Close(sqlt.ctx)
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}
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func (sqlt *sqlite) error(rc uint64, handle uint32, sql ...string) error {
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if rc == _OK {
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return nil
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}
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err := Error{code: rc}
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if err.Code() == NOMEM || err.ExtendedCode() == IOERR_NOMEM {
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panic(util.OOMErr)
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}
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if r := sqlt.call("sqlite3_errstr", rc); r != 0 {
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err.str = util.ReadString(sqlt.mod, uint32(r), _MAX_NAME)
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}
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if handle != 0 {
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if r := sqlt.call("sqlite3_errmsg", uint64(handle)); r != 0 {
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err.msg = util.ReadString(sqlt.mod, uint32(r), _MAX_LENGTH)
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}
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if sql != nil {
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if r := sqlt.call("sqlite3_error_offset", uint64(handle)); r != math.MaxUint32 {
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err.sql = sql[0][r:]
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}
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}
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}
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switch err.msg {
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case err.str, "not an error":
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err.msg = ""
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}
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return &err
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}
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func (sqlt *sqlite) getfn(name string) api.Function {
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c := &sqlt.funcs
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p := unsafe.StringData(name)
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for i := range c.id {
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if c.id[i] == p {
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c.id[i] = nil
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c.mask &^= uint32(1) << i
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return c.fn[i]
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}
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}
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return sqlt.mod.ExportedFunction(name)
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}
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func (sqlt *sqlite) putfn(name string, fn api.Function) {
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c := &sqlt.funcs
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p := unsafe.StringData(name)
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i := bits.TrailingZeros32(^c.mask)
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if i < 32 {
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c.id[i] = p
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c.fn[i] = fn
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c.mask |= uint32(1) << i
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} else {
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c.id[0] = p
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c.fn[0] = fn
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c.mask = uint32(1)
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}
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}
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func (sqlt *sqlite) call(name string, params ...uint64) uint64 {
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copy(sqlt.stack[:], params)
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fn := sqlt.getfn(name)
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err := fn.CallWithStack(sqlt.ctx, sqlt.stack[:])
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if err != nil {
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panic(err)
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}
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sqlt.putfn(name, fn)
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return sqlt.stack[0]
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}
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func (sqlt *sqlite) free(ptr uint32) {
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if ptr == 0 {
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return
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}
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sqlt.call("free", uint64(ptr))
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}
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func (sqlt *sqlite) new(size uint64) uint32 {
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if size > _MAX_ALLOCATION_SIZE {
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panic(util.OOMErr)
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}
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ptr := uint32(sqlt.call("malloc", size))
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if ptr == 0 && size != 0 {
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panic(util.OOMErr)
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}
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return ptr
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}
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func (sqlt *sqlite) newBytes(b []byte) uint32 {
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if (*[0]byte)(b) == nil {
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return 0
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}
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ptr := sqlt.new(uint64(len(b)))
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util.WriteBytes(sqlt.mod, ptr, b)
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return ptr
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}
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func (sqlt *sqlite) newString(s string) uint32 {
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ptr := sqlt.new(uint64(len(s) + 1))
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util.WriteString(sqlt.mod, ptr, s)
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return ptr
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}
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func (sqlt *sqlite) newArena(size uint64) arena {
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// Ensure the arena's size is a multiple of 8.
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size = (size + 7) &^ 7
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return arena{
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sqlt: sqlt,
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size: uint32(size),
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base: sqlt.new(size),
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}
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}
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type arena struct {
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sqlt *sqlite
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ptrs []uint32
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base uint32
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next uint32
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size uint32
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}
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func (a *arena) free() {
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if a.sqlt == nil {
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return
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}
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for _, ptr := range a.ptrs {
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a.sqlt.free(ptr)
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}
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a.sqlt.free(a.base)
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a.sqlt = nil
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}
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func (a *arena) mark() (reset func()) {
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ptrs := len(a.ptrs)
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next := a.next
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return func() {
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for _, ptr := range a.ptrs[ptrs:] {
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a.sqlt.free(ptr)
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}
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a.ptrs = a.ptrs[:ptrs]
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a.next = next
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}
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}
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func (a *arena) new(size uint64) uint32 {
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// Align the next address, to 4 or 8 bytes.
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if size&7 != 0 {
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a.next = (a.next + 3) &^ 3
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} else {
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a.next = (a.next + 7) &^ 7
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}
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if size <= uint64(a.size-a.next) {
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ptr := a.base + a.next
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a.next += uint32(size)
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return ptr
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}
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ptr := a.sqlt.new(size)
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a.ptrs = append(a.ptrs, ptr)
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return ptr
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}
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func (a *arena) bytes(b []byte) uint32 {
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if (*[0]byte)(b) == nil {
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return 0
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}
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ptr := a.new(uint64(len(b)))
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util.WriteBytes(a.sqlt.mod, ptr, b)
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return ptr
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}
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func (a *arena) string(s string) uint32 {
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ptr := a.new(uint64(len(s) + 1))
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util.WriteString(a.sqlt.mod, ptr, s)
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return ptr
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}
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func exportCallbacks(env wazero.HostModuleBuilder) wazero.HostModuleBuilder {
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util.ExportFuncIII(env, "go_busy_handler", busyCallback)
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util.ExportFuncII(env, "go_progress_handler", progressCallback)
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util.ExportFuncII(env, "go_commit_hook", commitCallback)
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util.ExportFuncVI(env, "go_rollback_hook", rollbackCallback)
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util.ExportFuncVIIIIJ(env, "go_update_hook", updateCallback)
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util.ExportFuncIIIII(env, "go_wal_hook", walCallback)
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util.ExportFuncIIIIII(env, "go_autovacuum_pages", autoVacuumCallback)
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util.ExportFuncIIIIIII(env, "go_authorizer", authorizerCallback)
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util.ExportFuncVIII(env, "go_log", logCallback)
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util.ExportFuncVI(env, "go_destroy", destroyCallback)
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util.ExportFuncVIIII(env, "go_func", funcCallback)
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util.ExportFuncVIIIII(env, "go_step", stepCallback)
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util.ExportFuncVIII(env, "go_final", finalCallback)
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util.ExportFuncVII(env, "go_value", valueCallback)
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util.ExportFuncVIIII(env, "go_inverse", inverseCallback)
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util.ExportFuncVIIII(env, "go_collation_needed", collationCallback)
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util.ExportFuncIIIIII(env, "go_compare", compareCallback)
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util.ExportFuncIIIIII(env, "go_vtab_create", vtabModuleCallback(xCreate))
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util.ExportFuncIIIIII(env, "go_vtab_connect", vtabModuleCallback(xConnect))
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util.ExportFuncII(env, "go_vtab_disconnect", vtabDisconnectCallback)
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util.ExportFuncII(env, "go_vtab_destroy", vtabDestroyCallback)
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util.ExportFuncIII(env, "go_vtab_best_index", vtabBestIndexCallback)
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util.ExportFuncIIIII(env, "go_vtab_update", vtabUpdateCallback)
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util.ExportFuncIII(env, "go_vtab_rename", vtabRenameCallback)
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util.ExportFuncIIIII(env, "go_vtab_find_function", vtabFindFuncCallback)
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util.ExportFuncII(env, "go_vtab_begin", vtabBeginCallback)
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util.ExportFuncII(env, "go_vtab_sync", vtabSyncCallback)
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util.ExportFuncII(env, "go_vtab_commit", vtabCommitCallback)
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util.ExportFuncII(env, "go_vtab_rollback", vtabRollbackCallback)
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util.ExportFuncIII(env, "go_vtab_savepoint", vtabSavepointCallback)
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util.ExportFuncIII(env, "go_vtab_release", vtabReleaseCallback)
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util.ExportFuncIII(env, "go_vtab_rollback_to", vtabRollbackToCallback)
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util.ExportFuncIIIIII(env, "go_vtab_integrity", vtabIntegrityCallback)
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util.ExportFuncIII(env, "go_cur_open", cursorOpenCallback)
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util.ExportFuncII(env, "go_cur_close", cursorCloseCallback)
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util.ExportFuncIIIIII(env, "go_cur_filter", cursorFilterCallback)
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util.ExportFuncII(env, "go_cur_next", cursorNextCallback)
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util.ExportFuncII(env, "go_cur_eof", cursorEOFCallback)
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util.ExportFuncIIII(env, "go_cur_column", cursorColumnCallback)
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util.ExportFuncIII(env, "go_cur_rowid", cursorRowIDCallback)
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return env
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}
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