forked from cerc-io/plugeth
361082ec4b
* Moved `vm.Transfer` to `core` package and changed execution to call `env.Transfer` instead of `core.Transfer` directly. * core/vm: byte code VM moved to jump table instead of switch * Moved `vm.Transfer` to `core` package and changed execution to call `env.Transfer` instead of `core.Transfer` directly. * Byte code VM now shares the same code as the JITVM * Renamed Context to Contract * Changed initialiser of state transition & unexported methods * Removed the Execution object and refactor `Call`, `CallCode` & `Create` in to their own functions instead of being methods. * Removed the hard dep on the state for the VM. The VM now depends on a Database interface returned by the environment. In the process the core now depends less on the statedb by usage of the env * Moved `Log` from package `core/state` to package `core/vm`.
64 lines
1.9 KiB
Go
64 lines
1.9 KiB
Go
// Copyright 2014 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 vm
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import (
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"fmt"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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)
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// Dissassemble dissassembles the byte code and returns the string
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// representation (human readable opcodes).
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func Disassemble(script []byte) (asm []string) {
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pc := new(big.Int)
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for {
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if pc.Cmp(big.NewInt(int64(len(script)))) >= 0 {
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return
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}
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// Get the memory location of pc
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val := script[pc.Int64()]
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// Get the opcode (it must be an opcode!)
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op := OpCode(val)
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asm = append(asm, fmt.Sprintf("%v", op))
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switch op {
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case PUSH1, PUSH2, PUSH3, PUSH4, PUSH5, PUSH6, PUSH7, PUSH8, PUSH9, PUSH10, PUSH11, PUSH12, PUSH13, PUSH14, PUSH15, PUSH16, PUSH17, PUSH18, PUSH19, PUSH20, PUSH21, PUSH22, PUSH23, PUSH24, PUSH25, PUSH26, PUSH27, PUSH28, PUSH29, PUSH30, PUSH31, PUSH32:
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pc.Add(pc, common.Big1)
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a := int64(op) - int64(PUSH1) + 1
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if int(pc.Int64()+a) > len(script) {
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return nil
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}
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data := script[pc.Int64() : pc.Int64()+a]
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if len(data) == 0 {
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data = []byte{0}
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}
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asm = append(asm, fmt.Sprintf("0x%x", data))
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pc.Add(pc, big.NewInt(a-1))
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}
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pc.Add(pc, common.Big1)
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}
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return
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}
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