core: vm: refactor file structure (#151)

For support other vm types, this pr modified the core/vm file
structures.

1 files changed, 0 insertions, 184 deletions

diff --git a/core/vm/contract.go b/core/vm/contract.go
deleted file mode 100644
index 751da072e..000000000
--- a/core/vm/contract.go
+++ /dev/null
@@ -1,184 +0,0 @@
-// Copyright 2015 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-package vm
-
-import (
-	"math/big"
-
-	"github.com/dexon-foundation/dexon/common"
-)
-
-// ContractRef is a reference to the contract's backing object
-type ContractRef interface {
-	Address() common.Address
-}
-
-// AccountRef implements ContractRef.
-//
-// Account references are used during EVM initialisation and
-// it's primary use is to fetch addresses. Removing this object
-// proves difficult because of the cached jump destinations which
-// are fetched from the parent contract (i.e. the caller), which
-// is a ContractRef.
-type AccountRef common.Address
-
-// Address casts AccountRef to a Address
-func (ar AccountRef) Address() common.Address { return (common.Address)(ar) }
-
-// Contract represents an ethereum contract in the state database. It contains
-// the contract code, calling arguments. Contract implements ContractRef
-type Contract struct {
-	// CallerAddress is the result of the caller which initialised this
-	// contract. However when the "call method" is delegated this value
-	// needs to be initialised to that of the caller's caller.
-	CallerAddress common.Address
-	caller        ContractRef
-	self          ContractRef
-
-	jumpdests map[common.Hash]bitvec // Aggregated result of JUMPDEST analysis.
-	analysis  bitvec                 // Locally cached result of JUMPDEST analysis
-
-	Code     []byte
-	CodeHash common.Hash
-	CodeAddr *common.Address
-	Input    []byte
-
-	Gas   uint64
-	value *big.Int
-}
-
-// NewContract returns a new contract environment for the execution of EVM.
-func NewContract(caller ContractRef, object ContractRef, value *big.Int, gas uint64) *Contract {
-	c := &Contract{CallerAddress: caller.Address(), caller: caller, self: object}
-
-	if parent, ok := caller.(*Contract); ok {
-		// Reuse JUMPDEST analysis from parent context if available.
-		c.jumpdests = parent.jumpdests
-	} else {
-		c.jumpdests = make(map[common.Hash]bitvec)
-	}
-
-	// Gas should be a pointer so it can safely be reduced through the run
-	// This pointer will be off the state transition
-	c.Gas = gas
-	// ensures a value is set
-	c.value = value
-
-	return c
-}
-
-func (c *Contract) validJumpdest(dest *big.Int) bool {
-	udest := dest.Uint64()
-	// PC cannot go beyond len(code) and certainly can't be bigger than 63bits.
-	// Don't bother checking for JUMPDEST in that case.
-	if dest.BitLen() >= 63 || udest >= uint64(len(c.Code)) {
-		return false
-	}
-	// Only JUMPDESTs allowed for destinations
-	if OpCode(c.Code[udest]) != JUMPDEST {
-		return false
-	}
-	// Do we have a contract hash already?
-	if c.CodeHash != (common.Hash{}) {
-		// Does parent context have the analysis?
-		analysis, exist := c.jumpdests[c.CodeHash]
-		if !exist {
-			// Do the analysis and save in parent context
-			// We do not need to store it in c.analysis
-			analysis = codeBitmap(c.Code)
-			c.jumpdests[c.CodeHash] = analysis
-		}
-		return analysis.codeSegment(udest)
-	}
-	// We don't have the code hash, most likely a piece of initcode not already
-	// in state trie. In that case, we do an analysis, and save it locally, so
-	// we don't have to recalculate it for every JUMP instruction in the execution
-	// However, we don't save it within the parent context
-	if c.analysis == nil {
-		c.analysis = codeBitmap(c.Code)
-	}
-	return c.analysis.codeSegment(udest)
-}
-
-// AsDelegate sets the contract to be a delegate call and returns the current
-// contract (for chaining calls)
-func (c *Contract) AsDelegate() *Contract {
-	// NOTE: caller must, at all times be a contract. It should never happen
-	// that caller is something other than a Contract.
-	parent := c.caller.(*Contract)
-	c.CallerAddress = parent.CallerAddress
-	c.value = parent.value
-
-	return c
-}
-
-// GetOp returns the n'th element in the contract's byte array
-func (c *Contract) GetOp(n uint64) OpCode {
-	return OpCode(c.GetByte(n))
-}
-
-// GetByte returns the n'th byte in the contract's byte array
-func (c *Contract) GetByte(n uint64) byte {
-	if n < uint64(len(c.Code)) {
-		return c.Code[n]
-	}
-
-	return 0
-}
-
-// Caller returns the caller of the contract.
-//
-// Caller will recursively call caller when the contract is a delegate
-// call, including that of caller's caller.
-func (c *Contract) Caller() common.Address {
-	return c.CallerAddress
-}
-
-// UseGas attempts the use gas and subtracts it and returns true on success
-func (c *Contract) UseGas(gas uint64) (ok bool) {
-	if c.Gas < gas {
-		return false
-	}
-	c.Gas -= gas
-	return true
-}
-
-// Address returns the contracts address
-func (c *Contract) Address() common.Address {
-	return c.self.Address()
-}
-
-// Value returns the contracts value (sent to it from it's caller)
-func (c *Contract) Value() *big.Int {
-	return c.value
-}
-
-// SetCallCode sets the code of the contract and address of the backing data
-// object
-func (c *Contract) SetCallCode(addr *common.Address, hash common.Hash, code []byte) {
-	c.Code = code
-	c.CodeHash = hash
-	c.CodeAddr = addr
-}
-
-// SetCodeOptionalHash can be used to provide code, but it's optional to provide hash.
-// In case hash is not provided, the jumpdest analysis will not be saved to the parent context
-func (c *Contract) SetCodeOptionalHash(addr *common.Address, codeAndHash *codeAndHash) {
-	c.Code = codeAndHash.code
-	c.CodeHash = codeAndHash.hash
-	c.CodeAddr = addr
-}