85 lines
1.6 KiB
Go
85 lines
1.6 KiB
Go
package vm
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import (
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"fmt"
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"github.com/ethereum/go-ethereum/common"
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)
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type Memory struct {
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store []byte
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}
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func NewMemory() *Memory {
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return &Memory{nil}
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}
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func (m *Memory) Set(offset, size uint64, value []byte) {
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// length of store may never be less than offset + size.
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// The store should be resized PRIOR to setting the memory
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if size > uint64(len(m.store)) {
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panic("INVALID memory: store empty")
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}
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// It's possible the offset is greater than 0 and size equals 0. This is because
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// the calcMemSize (common.go) could potentially return 0 when size is zero (NO-OP)
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if size > 0 {
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copy(m.store[offset:offset+size], common.RightPadBytes(value, int(size)))
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}
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}
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func (m *Memory) Resize(size uint64) {
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if uint64(m.Len()) < size {
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m.store = append(m.store, make([]byte, size-uint64(m.Len()))...)
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}
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}
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func (self *Memory) Get(offset, size int64) (cpy []byte) {
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if size == 0 {
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return nil
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}
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if len(self.store) > int(offset) {
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cpy = make([]byte, size)
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copy(cpy, self.store[offset:offset+size])
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return
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}
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return
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}
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func (self *Memory) GetPtr(offset, size int64) []byte {
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if size == 0 {
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return nil
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}
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if len(self.store) > int(offset) {
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return self.store[offset : offset+size]
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}
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return nil
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}
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func (m *Memory) Len() int {
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return len(m.store)
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}
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func (m *Memory) Data() []byte {
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return m.store
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}
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func (m *Memory) Print() {
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fmt.Printf("### mem %d bytes ###\n", len(m.store))
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if len(m.store) > 0 {
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addr := 0
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for i := 0; i+32 <= len(m.store); i += 32 {
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fmt.Printf("%03d: % x\n", addr, m.store[i:i+32])
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addr++
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}
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} else {
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fmt.Println("-- empty --")
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}
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fmt.Println("####################")
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}
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