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