58 lines
1.8 KiB
Go
58 lines
1.8 KiB
Go
// Copyright 2017 The go-interpreter Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package exec
|
|
|
|
import "errors"
|
|
|
|
var (
|
|
// ErrSignatureMismatch is the error value used while trapping the VM when
|
|
// a signature mismatch between the table entry and the type entry is found
|
|
// in a call_indirect operation.
|
|
ErrSignatureMismatch = errors.New("exec: signature mismatch in call_indirect")
|
|
// ErrUndefinedElementIndex is the error value used while trapping the VM when
|
|
// an invalid index to the module's table space is used as an operand to
|
|
// call_indirect
|
|
ErrUndefinedElementIndex = errors.New("exec: undefined element index")
|
|
)
|
|
|
|
func (vm *VM) call() {
|
|
index := vm.fetchUint32()
|
|
|
|
vm.funcs[index].call(vm, int64(index))
|
|
}
|
|
|
|
func (vm *VM) callIndirect() {
|
|
index := vm.fetchUint32()
|
|
fnExpect := vm.module.Types.Entries[index]
|
|
_ = vm.fetchUint32() // reserved (https://github.com/WebAssembly/design/blob/27ac254c854994103c24834a994be16f74f54186/BinaryEncoding.md#call-operators-described-here)
|
|
tableIndex := vm.popUint32()
|
|
if int(tableIndex) >= len(vm.module.TableIndexSpace[0]) {
|
|
panic(ErrUndefinedElementIndex)
|
|
}
|
|
elemIndex := vm.module.TableIndexSpace[0][tableIndex]
|
|
fnActual := vm.module.FunctionIndexSpace[elemIndex]
|
|
|
|
if len(fnExpect.ParamTypes) != len(fnActual.Sig.ParamTypes) {
|
|
panic(ErrSignatureMismatch)
|
|
}
|
|
if len(fnExpect.ReturnTypes) != len(fnActual.Sig.ReturnTypes) {
|
|
panic(ErrSignatureMismatch)
|
|
}
|
|
|
|
for i := range fnExpect.ParamTypes {
|
|
if fnExpect.ParamTypes[i] != fnActual.Sig.ParamTypes[i] {
|
|
panic(ErrSignatureMismatch)
|
|
}
|
|
}
|
|
|
|
for i := range fnExpect.ReturnTypes {
|
|
if fnExpect.ReturnTypes[i] != fnActual.Sig.ReturnTypes[i] {
|
|
panic(ErrSignatureMismatch)
|
|
}
|
|
}
|
|
|
|
vm.funcs[elemIndex].call(vm, int64(elemIndex))
|
|
}
|