Removes unused FunctionInstance.LocalTypes (#925)

Signed-off-by: Takeshi Yoneda <takeshi@tetrate.io>

internal/engine/compiler/engine.go

@@ -352,7 +352,7 @@ const (
 	tableInstanceTableLenOffset = 8
 
 	// Offsets for wasm.FunctionInstance.
-	functionInstanceTypeIDOffset = 88
+	functionInstanceTypeIDOffset = 40
 
 	// Offsets for wasm.MemoryInstance.
 	memoryInstanceBufferOffset    = 0

internal/wasm/module.go

@@ -621,8 +621,6 @@ func (m *ModuleInstance) BuildFunctions(mod *Module, importedFunctions []*Functi
 		// reduces the number of heap objects which improves GC performance.
 		fns[offset] = FunctionInstance{
 			IsHostFunction: code.IsHostFunction,
-			LocalTypes:     code.LocalTypes,
-			Body:           code.Body,
 			GoFunc:         code.GoFunc,
 			TypeID:         m.TypeIDs[section],
 			Module:         m,

internal/wasm/module_test.go

@@ -830,7 +830,6 @@ func TestModule_buildFunctions(t *testing.T) {
 	instance.BuildFunctions(m, nil)
 	for i, f := range instance.Functions[1:] {
 		require.Equal(t, uint32(i+1), f.Definition.Index())
-		require.Equal(t, nopCode.Body, f.Body)
 	}
 }
 

internal/wasm/store.go

@@ -107,12 +107,6 @@ type (
 		// Type is the signature of this function.
 		Type *FunctionType
 
-		// LocalTypes holds types of locals, set when Kind == FunctionKindWasm
-		LocalTypes []ValueType
-
-		// Body is the function body in WebAssembly Binary Format, set when Kind == FunctionKindWasm
-		Body []byte
-
 		// GoFunc is non-nil when IsHostFunction and defined in go, either
 		// api.GoFunction or api.GoModuleFunction.
 		//