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authorJM <jm@dexon.org>2019-01-15 23:33:28 +0800
committerGitHub <noreply@github.com>2019-01-15 23:33:28 +0800
commit020c8a477578cef3764b54f33d9ca0cf6caf7631 (patch)
tree08a669a19cc428b8c48dad180f1f32096885826b /core/vm/contract.go
parentbdde6109ffa6fa4d295708a2a75271186a12c761 (diff)
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core: vm: refactor file structure (#151)
For support other vm types, this pr modified the core/vm file structures.
Diffstat (limited to 'core/vm/contract.go')
-rw-r--r--core/vm/contract.go184
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
-}