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core/vm: use uint256 in EVM implementation (#20787)

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* core/vm: use fixed uint256 library instead of big

* core/vm: remove intpools

* core/vm: upgrade uint256, fixes uint256.NewFromBig

* core/vm: use uint256.Int by value in Stack

* core/vm: upgrade uint256 to v1.0.0

* core/vm: don't preallocate space for 1024 stack items (only 16)

Co-authored-by: Martin Holst Swende <martin@swende.se>
This commit is contained in:
Paweł Bylica
2020-06-08 14:24:40 +02:00
committed by GitHub
parent 39abd92ca8
commit cf6674539c
21 changed files with 359 additions and 704 deletions
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9
core/vm/contract.go
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@ -20,6 +20,7 @@ import (
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/holiman/uint256"
)
// ContractRef is a reference to the contract's backing object
@ -81,11 +82,11 @@ func NewContract(caller ContractRef, object ContractRef, value *big.Int, gas uin
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 63 bits.
func (c *Contract) validJumpdest(dest *uint256.Int) bool {
udest, overflow := dest.Uint64WithOverflow()
// 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)) {
if overflow || udest >= uint64(len(c.Code)) {
return false
}
// Only JUMPDESTs allowed for destinations