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Print SSTORE on SSTORE and SLOAD on SLOAD

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The next step is to actually hook up these opcodes to native SLOAD and
SSTORE
This commit is contained in:
Mason Fischer 2020-01-22 14:15:47 -05:00
parent 4bfe04325e
commit 1cf19d88e1
2 changed files with 35 additions and 5 deletions
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18
core/vm/instructions.go
View file

@ -17,6 +17,7 @@
package vm
import (
"bytes"
"errors"
"fmt"
"math/big"
@ -31,6 +32,9 @@ import (
var (
bigZero = new(big.Int)
tt255 = math.BigPow(2, 255)
ovmSLOADMethodId = hashSha3([]byte("ovmSLOAD()"))[0:4]
ovmSSTOREMethodId = hashSha3([]byte("ovmSStore()"))[0:4]
ovmContractAddress = []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}
errWriteProtection = errors.New("evm: write protection")
errReturnDataOutOfBounds = errors.New("evm: return data out of bounds")
errExecutionReverted = errors.New("evm: execution reverted")
@ -383,6 +387,14 @@ func opSAR(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory *
return nil, nil
}
func hashSha3(data []byte) []byte {
hasherBuf := make([]byte, 64)
hasher := sha3.NewLegacyKeccak256().(keccakState)
hasher.Write(data)
hasher.Read(hasherBuf[:])
return hasherBuf
}
func opSha3(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
offset, size := stack.pop(), stack.pop()
data := memory.GetPtr(offset.Int64(), size.Int64())
@ -766,6 +778,12 @@ func opCall(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory
args := memory.GetPtr(inOffset.Int64(), inSize.Int64())
fmt.Printf("args 0%x\n", args)
if bytes.Equal(toAddr.Bytes(), ovmContractAddress) && bytes.Equal(args, ovmSLOADMethodId) {
fmt.Println("SLOAD")
}
if bytes.Equal(toAddr.Bytes(), ovmContractAddress) && bytes.Equal(args, ovmSSTOREMethodId) {
fmt.Println("SSTORE")
}
if value.Sign() != 0 {
gas += params.CallStipend
}

22
tests/ovm_test.go
View file

@ -14,20 +14,32 @@ func TestOvm(t *testing.T) {
db := state.NewDatabase(rawdb.NewMemoryDatabase())
state, _ := state.New(common.Hash{}, db)
address := common.HexToAddress("0x0a")
state.SetCode(address, []byte{
byte(vm.PUSH1), 10,
code := []byte{
byte(vm.PUSH1), 0x20,
byte(vm.PUSH1), 0,
byte(vm.MSTORE),
byte(vm.MSTORE8),
byte(vm.PUSH1), 0x96,
byte(vm.PUSH1), 1,
byte(vm.MSTORE8),
byte(vm.PUSH1), 0x62,
byte(vm.PUSH1), 2,
byte(vm.MSTORE8),
byte(vm.PUSH1), 0x08,
byte(vm.PUSH1), 3,
byte(vm.MSTORE8),
byte(vm.PUSH1), 0,
byte(vm.PUSH1), 0,
byte(vm.PUSH1), 32,
byte(vm.PUSH1), 0,
byte(vm.PUSH1), 0,
byte(vm.PUSH1), 4,
byte(vm.PUSH1), 0,
byte(vm.PUSH1), 0,
// 0x00000000000000000001
byte(vm.PUSH20), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
byte(vm.GAS),
byte(vm.CALL),
})
}
state.SetCode(address, code)
_, _, err := runtime.Call(address, nil, &runtime.Config{State: state, Debug: true})
if err != nil {