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91a7a4a786
Previously it was assumed that wheneven type `[]interface{}` was given
that the interface was empty. The abigen rightfully assumed that
interface slices which already have pre-allocated variable sets to be
assigned.
This PR fixes that by checking that the given `[]interface{}` is larger
than zero and assigns each value using the generic `set` function (this
function has also been moved to abi/reflect.go) and checks whether the
assignment was possible.
The generic assignment function `set` now also deals with pointers
(useful for interface slice mentioned above) by dereferencing the
pointer until it finds a setable type.
98 lines
2.8 KiB
Go
98 lines
2.8 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package abi
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import (
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"fmt"
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"reflect"
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)
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// indirect recursively dereferences the value until it either gets the value
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// or finds a big.Int
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func indirect(v reflect.Value) reflect.Value {
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if v.Kind() == reflect.Ptr && v.Elem().Type() != big_t {
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return indirect(v.Elem())
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}
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return v
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}
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// reflectIntKind returns the reflect using the given size and
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// unsignedness.
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func reflectIntKind(unsigned bool, size int) reflect.Kind {
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switch size {
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case 8:
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if unsigned {
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return reflect.Uint8
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}
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return reflect.Int8
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case 16:
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if unsigned {
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return reflect.Uint16
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}
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return reflect.Int16
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case 32:
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if unsigned {
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return reflect.Uint32
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}
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return reflect.Int32
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case 64:
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if unsigned {
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return reflect.Uint64
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}
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return reflect.Int64
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}
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return reflect.Ptr
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}
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// mustArrayToBytesSlice creates a new byte slice with the exact same size as value
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// and copies the bytes in value to the new slice.
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func mustArrayToByteSlice(value reflect.Value) reflect.Value {
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slice := reflect.MakeSlice(reflect.TypeOf([]byte{}), value.Len(), value.Len())
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reflect.Copy(slice, value)
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return slice
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}
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// set attempts to assign src to dst by either setting, copying or otherwise.
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//
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// set is a bit more lenient when it comes to assignment and doesn't force an as
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// strict ruleset as bare `reflect` does.
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func set(dst, src reflect.Value, output Argument) error {
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dstType := dst.Type()
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srcType := src.Type()
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switch {
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case dstType.AssignableTo(src.Type()):
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dst.Set(src)
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case dstType.Kind() == reflect.Array && srcType.Kind() == reflect.Slice:
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if !dstType.Elem().AssignableTo(r_byte) {
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return fmt.Errorf("abi: cannot unmarshal %v in to array of elem %v", src.Type(), dstType.Elem())
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}
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if dst.Len() < output.Type.SliceSize {
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return fmt.Errorf("abi: cannot unmarshal src (len=%d) in to dst (len=%d)", output.Type.SliceSize, dst.Len())
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}
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reflect.Copy(dst, src)
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case dstType.Kind() == reflect.Interface:
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dst.Set(src)
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case dstType.Kind() == reflect.Ptr:
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return set(dst.Elem(), src, output)
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default:
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return fmt.Errorf("abi: cannot unmarshal %v in to %v", src.Type(), dst.Type())
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}
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return nil
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}
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