update bridge

bridge.go

@@ -2,35 +2,51 @@ package wasm
 
 import (
 	"encoding/binary"
+	"fmt"
+	"math"
+	"sync"
+	"unsafe"
 
 	"github.com/wasmerio/go-ext-wasm/wasmer"
 )
 
-func init() {
-	Bridge = new(bridge)
+var undefined = &struct{}{}
+var bridges = map[string]*Bridge{}
+var mu sync.RWMutex // to protect bridges
+
+type context struct {
+	n string
 }
 
-// Bridge connects go wasm builds
-var Bridge *bridge
+func setBridge(b *Bridge) unsafe.Pointer {
+	mu.Lock()
+	defer mu.Unlock()
+	bridges[b.name] = b
+	return unsafe.Pointer(&context{n: b.name})
+}
 
-type bridge struct {
+func getBridge(ctx unsafe.Pointer) *Bridge {
+	ictx := wasmer.IntoInstanceContext(ctx)
+	c := (*context)(ictx.Data())
+	mu.RLock()
+	defer mu.RUnlock()
+	return bridges[c.n]
+}
+
+type Bridge struct {
+	name     string
 	instance wasmer.Instance
 	vmExit   bool
 	exitCode int
 }
 
-// GoBridge returns a new bridge.
-func (b *bridge) InitWASM(file string, imports *wasmer.Imports) (err error) {
-	bytes, err := wasmer.ReadBytes(file)
-	if err != nil {
-		return err
-	}
-
+func (b *Bridge) InitWASMBytes(name string, bytes []byte, imports *wasmer.Imports) error {
 	if imports == nil {
 		imports = wasmer.NewImports()
 	}
 
-	err = b.addImports(imports)
+	b.name = name
+	err := b.addImports(imports)
 	if err != nil {
 		return err
 	}
@@ -41,11 +57,21 @@ func (b *bridge) InitWASM(file string, imports *wasmer.Imports) (err error) {
 	}
 
 	b.instance = inst
+	inst.SetContextData(setBridge(b))
 	return nil
 }
 
+func (b *Bridge) InitWASM(name, file string, imports *wasmer.Imports) (err error) {
+	bytes, err := wasmer.ReadBytes(file)
+	if err != nil {
+		return err
+	}
+
+	return b.InitWASMBytes(name, bytes, imports)
+}
+
 // Run start the wasm instance.
-func (b *bridge) Run() error {
+func (b *Bridge) Run() error {
 	defer b.instance.Close()
 
 	run := b.instance.Exports["run"]
@@ -62,26 +88,65 @@ func (b *bridge) Run() error {
 		}
 	}
 
+	fmt.Printf("WASM exited with code: %v\n", b.exitCode)
 	return nil
 }
 
-func (b *bridge) mem() []byte {
+func (b *Bridge) mem() []byte {
 	return b.instance.Memory.Data()
 }
 
-func (b bridge) setInt64(offset int32, v int64) {
+func (b Bridge) setInt64(offset int32, v int64) {
 	mem := b.mem()
 	binary.LittleEndian.PutUint64(mem[offset:], uint64(v))
 }
 
-func (b bridge) loadSlice(addr int32) []byte {
+func (b Bridge) setUint64(offset int32, v uint64) {
+	mem := b.mem()
+	binary.LittleEndian.PutUint64(mem[offset:], v)
+}
+
+func (b Bridge) getUnit64(offset int32) uint64 {
+	mem := b.mem()
+	return binary.LittleEndian.Uint64(mem[offset+0:])
+}
+
+func (b Bridge) setFloat64(offset int32, v float64) {
+	uf := math.Float64bits(v)
+	b.setUint64(offset, uf)
+}
+
+func (b Bridge) getFloat64(offset int32) float64 {
+	uf := b.getUnit64(offset)
+	return math.Float64frombits(uf)
+}
+
+func (b Bridge) getUint32(offset int32) uint32 {
+	return binary.LittleEndian.Uint32(b.mem()[offset+0:])
+}
+
+func (b Bridge) loadSlice(addr int32) []byte {
 	mem := b.mem()
 	array := binary.LittleEndian.Uint64(mem[addr+0:])
 	length := binary.LittleEndian.Uint64(mem[addr+8:])
 	return mem[array : array+length]
 }
 
-func (b bridge) loadString(addr int32) string {
+func (b Bridge) loadString(addr int32) string {
 	d := b.loadSlice(addr)
 	return string(d)
 }
+
+func (b Bridge) loadValue(addr int32) interface{} {
+	f := b.getFloat64(addr)
+	if f == 0 {
+		return undefined
+	}
+
+	if !math.IsNaN(f) {
+		return f
+	}
+
+	// return value instead of uint32
+	return b.getUint32(addr)
+}

imports.go

@@ -38,47 +38,47 @@ import (
 )
 
 //export debug
-func debug(ctx unsafe.Pointer, a int32) {
-	log.Println(a)
+func debug(ctx unsafe.Pointer, sp int32) {
+	log.Println(sp)
 }
 
 //export wexit
-func wexit(ctx unsafe.Pointer, a int32) {
-	Bridge.vmExit = true
-	mem := Bridge.mem()
-	Bridge.exitCode = int(binary.LittleEndian.Uint32(mem[a+8:]))
-	fmt.Println("Wasm exited with code", Bridge.exitCode)
+func wexit(ctx unsafe.Pointer, sp int32) {
+	b := getBridge(ctx)
+	b.vmExit = true
+	mem := b.mem()
+	b.exitCode = int(binary.LittleEndian.Uint32(mem[sp+8:]))
 }
 
 //export wwrite
-func wwrite(ctx unsafe.Pointer, a int32) {
-	fmt.Println("wasm write", a)
+func wwrite(ctx unsafe.Pointer, sp int32) {
+	fmt.Println("wasm write", sp)
 }
 
 //export nanotime
-func nanotime(ctx unsafe.Pointer, a int32) {
+func nanotime(ctx unsafe.Pointer, sp int32) {
 	n := time.Now().UnixNano()
-	Bridge.setInt64(a+8, n)
+	getBridge(ctx).setInt64(sp+8, n)
 }
 
 //export walltime
-func walltime(ctx unsafe.Pointer, a int32) {
+func walltime(ctx unsafe.Pointer, sp int32) {
 	fmt.Println("wall time")
 }
 
 //export scheduleCallback
-func scheduleCallback(ctx unsafe.Pointer, a int32) {
+func scheduleCallback(ctx unsafe.Pointer, sp int32) {
 	fmt.Println("schedule callback")
 }
 
 //export clearScheduledCallback
-func clearScheduledCallback(ctx unsafe.Pointer, a int32) {
+func clearScheduledCallback(ctx unsafe.Pointer, sp int32) {
 	fmt.Println("clear scheduled callback")
 }
 
 //export getRandomData
-func getRandomData(ctx unsafe.Pointer, a int32) {
-	s := Bridge.loadSlice(a + 8)
+func getRandomData(ctx unsafe.Pointer, sp int32) {
+	s := getBridge(ctx).loadSlice(sp + 8)
 	_, err := rand.Read(s)
 	if err != nil {
 		fmt.Println("failed: getRandomData", err)
@@ -86,73 +86,78 @@ func getRandomData(ctx unsafe.Pointer, a int32) {
 }
 
 //export stringVal
-func stringVal(ctx unsafe.Pointer, a int32) {
+func stringVal(ctx unsafe.Pointer, sp int32) {
 	fmt.Println("stringVal")
 }
 
 //export valueGet
-func valueGet(ctx unsafe.Pointer, a int32) {
-	str := Bridge.loadString(a + 16)
-	fmt.Println("valueGet", str)
+func valueGet(ctx unsafe.Pointer, sp int32) {
+	b := getBridge(ctx)
+	str := b.loadString(sp + 16)
+	val := b.loadValue(sp + 8)
+	fmt.Println("valueGet", str, val)
 }
 
 //export valueSet
-func valueSet(ctx unsafe.Pointer, a int32) {
-	fmt.Println("valueSet")
+func valueSet(ctx unsafe.Pointer, sp int32) {
+	str := getBridge(ctx).loadString(sp + 16)
+	fmt.Println("valueSet", str)
 }
 
 //export valueIndex
-func valueIndex(ctx unsafe.Pointer, a int32) {
+func valueIndex(ctx unsafe.Pointer, sp int32) {
 	fmt.Println("valueIndex")
 }
 
 //export valueSetIndex
-func valueSetIndex(ctx unsafe.Pointer, a int32) {
+func valueSetIndex(ctx unsafe.Pointer, sp int32) {
 	fmt.Println("valueSetIndex")
 }
 
 //export valueCall
-func valueCall(ctx unsafe.Pointer, a int32) {
-	fmt.Println("valueCall")
+func valueCall(ctx unsafe.Pointer, sp int32) {
+	str := getBridge(ctx).loadString(sp + 16)
+	fmt.Println("valueCall", str)
 }
 
 //export valueInvoke
-func valueInvoke(ctx unsafe.Pointer, a int32) {
+func valueInvoke(ctx unsafe.Pointer, sp int32) {
 	fmt.Println("valueInvoke")
 }
 
 //export valueNew
-func valueNew(ctx unsafe.Pointer, a int32) {
-	fmt.Println("valueNew")
+func valueNew(ctx unsafe.Pointer, sp int32) {
+	str := getBridge(ctx).loadString(sp + 16)
+	fmt.Println("valueNew", str)
 }
 
 //export valueLength
-func valueLength(ctx unsafe.Pointer, a int32) {
+func valueLength(ctx unsafe.Pointer, sp int32) {
 	fmt.Println("valueLength")
 }
 
 //export valuePrepareString
-func valuePrepareString(ctx unsafe.Pointer, a int32) {
+func valuePrepareString(ctx unsafe.Pointer, sp int32) {
 	fmt.Println("valuePrepareString")
 }
 
 //export valueLoadString
-func valueLoadString(ctx unsafe.Pointer, a int32) {
+func valueLoadString(ctx unsafe.Pointer, sp int32) {
 	fmt.Println("valueLoadString")
 }
 
 //export scheduleTimeoutEvent
-func scheduleTimeoutEvent(ctx unsafe.Pointer, a int32) {
+func scheduleTimeoutEvent(ctx unsafe.Pointer, sp int32) {
 	fmt.Println("scheduleTimeoutEvent")
 }
 
 //export clearTimeoutEvent
-func clearTimeoutEvent(ctx unsafe.Pointer, a int32) {
+func clearTimeoutEvent(ctx unsafe.Pointer, sp int32) {
 	fmt.Println("clearTimeoutEvent")
 }
 
-// addImports adds go bridge imports in "go" namespace.
-func (b *bridge) addImports(imps *wasmer.Imports) error {
+// addImports adds go Bridge imports in "go" namespace.
+func (b *Bridge) addImports(imps *wasmer.Imports) error {
 	imps = imps.Namespace("go")
 	var is = []struct {
 		name string

simple/caller/main.go

@@ -7,12 +7,13 @@ import (
 )
 
 func main() {
-	err := wasmgo.Bridge.InitWASM("./simple/prog/main.wasm", nil)
+	b := wasmgo.Bridge{}
+	err := b.InitWASM("test", "./simple/prog/main.wasm", nil)
 	if err != nil {
 		log.Fatal(err)
 	}
 
-	if err := wasmgo.Bridge.Run(); err != nil {
+	if err := b.Run(); err != nil {
 		log.Fatal(err)
 	}
 }